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Sample records for anthropomorphic transfemoral prosthesis

  1. Preliminary Evaluations of a Self-Contained Anthropomorphic Transfemoral Prosthesis

    OpenAIRE

    Sup, Frank; Varol, Huseyin Atakan; Mitchell, Jason; Withrow, Thomas J.; Goldfarb, Michael

    2009-01-01

    This paper presents a self-contained powered knee and ankle prosthesis, intended to enhance the mobility of transfemoral amputees. A finite-state based impedance control approach, previously developed by the authors, is used for the control of the prosthesis during walking and standing. Experiments on an amputee subject for level treadmill and overground walking are described. Knee and ankle joint angle, torque, and power data taken during walking experiments at various speeds demonstrate the...

  2. Design and Control of a Powered Transfemoral Prosthesis

    OpenAIRE

    Sup, Frank; Bohara, Amit; Goldfarb, Michael

    2008-01-01

    The paper describes the design and control of a transfemoral prosthesis with powered knee and ankle joints. The initial prototype is a pneumatically actuated powered-tethered device, which is intended to serve as a laboratory test bed for a subsequent self-powered version. The prosthesis design is described, including its kinematic optimization and the design of a three-axis socket load cell that measures the forces and moments of interaction between the socket and prosthesis. A gait controll...

  3. Metabolics of stair ascent with a powered transfemoral prosthesis.

    Science.gov (United States)

    Ledoux, E D; Lawson, B E; Shultz, A H; Bartlett, H L; Goldfarb, M

    2015-01-01

    This paper evaluates the effectiveness of a powered knee and ankle prosthesis for stair ascent through a metabolic assessment comparing energy expenditure of a single transfemoral amputee subject while ascending stairs with the powered prosthesis relative to his passive daily use device, as well as comparing the kinematics and kinetics obtained with the passive prosthesis to healthy biomechanics. The subject wore a portable system that measured pulmonary gaseous exchange rates of oxygen and carbon dioxide while he ascended stairs with each of the prostheses in alternating tests. The results indicated that the amputee's energy expenditure decreased by 32 percent while climbing with the powered prosthesis as compared to his passive one, and the kinematics and kinetics achieved were representative of healthy biomechanics. PMID:26737489

  4. Self-Contained Powered Knee and Ankle Prosthesis: Initial Evaluation on a Transfemoral Amputee

    OpenAIRE

    Sup, Frank; Varol, Huseyin Atakan; Mitchell, Jason; Withrow, Thomas J.; Goldfarb, Michael

    2009-01-01

    This paper presents an overview of the design and control of a fully self-contained prosthesis, which is intended to improve the mobility of transfemoral amputees. A finite-state based impedance control approach, previously developed by the authors, is used for the control of the prosthesis during walking and standing. The prosthesis was tested on an unilateral amputee subject for over-ground walking. Prosthesis sensor data (joint angles and torques) acquired during level ground walking exper...

  5. WalkMECH: design and control of an energy recycling transfemoral prosthesis

    OpenAIRE

    Ünal, R.

    2014-01-01

    This study presents the design and realization of an energy-efficient trans-femoral prosthesis called WalkMECH. Trans-femoral amputees consume significant amount of extra metabolic energy (more than 65% extra) during walking compared to the ablebodied person. Therefore, we mainly focused on the design possibilities for reducing the metabolic cost of an amputee during walking. Both clinical and bio-mechanical research studies have shown that the lack of energetic relations between the hip, kne...

  6. The mechanical design of a transfemoral prosthesis using computational tools and design methodology

    Directory of Open Access Journals (Sweden)

    John Sánchez Otero

    2012-12-01

    Full Text Available Artificial limb replacement with lower limb prostheses has been widely reported in current scientific literature. There are many lower limb prosthetic designs ranging from a single-axis knee mechanism to complex mechanisms involving microcontrollers, made from many materials ranging from lightweight, high specific strength ones (e.g., carbon fibre to traditional forms (e.g., stainless steel. However, the challenge is to design prostheses whose movement resembles the human body’s natural movement as closely as possible. Advances in prosthetics have enabled many amputees to return to their everyday activities; however, such prostheses are expensive, some costing as much as $60,000. Many of the affected population in Colombia have scarce economic resources; there is therefore a need to develop affordable functional prostheses.The Universidad del Norte’s Materials, Processes and Design Research Group and the Robotics and Intelligent Systems Group have been working on this line of research to develop modular prostheses which can be adjusted to each patient’s requirements. This research represents an initial methodological approach to developing a prosthesis in which software tools have been used (the finite element method with a criteria relationship matrix for selecting the best alternative while considering different aspects such as mod-ularity, cost, stiffness and weight.

  7. Powered Sit-to-Stand and Assistive Stand-to-Sit Framework for a Powered Transfemoral Prosthesis

    OpenAIRE

    Varol, Huseyin Atakan; Sup, Frank; Goldfarb, Michael

    2009-01-01

    This work extends the three level powered knee and ankle prosthesis control framework previously developed by the authors by adding sitting mode. A middle level finite state based impedance controller is designed to accommodate sitting, sit-to-stand and stand-to-sit transitions. Moreover, a high level Gaussian Mixture Model based intent recognizer is developed to distinguish between standing and sitting modes and switch the middle level controllers accordingly. Experimental results with unila...

  8. Prosthesis

    Science.gov (United States)

    ... by prosthetic devices. False teeth are known as dental prostheses. An artificial replacement of the jaw bone is called a maxillofacial prosthesis. Penis implants are also known as penile prostheses.

  9. Prosthetic ambulation in a paraplegic patient with a transfemoral amputation and radial nerve palsy.

    Science.gov (United States)

    Shin, J C; Park, C; Kim, D Y; Choi, Y S; Kim, Y K; Seong, Y J

    2000-08-01

    Great importance and caution should be placed on prosthetic fitting for a paraplegic patient with an anesthetic residual limb if functional ambulation is to be achieved. The combination of paraplegia with a transfemoral amputation and radial nerve palsy is a complex injury that makes the rehabilitation process difficult. This article describes a case of L2 paraplegia with a transfemoral amputation and radial nerve palsy on the right side. Following the rehabilitation course, the patient independently walked using a walker at indoor level with a transfemoral prosthesis with ischial containment socket, polycentric knee assembly, endoskeletal shank and multiaxis foot assembly and a knee ankle foot orthosis on the sound side. The difficulties of fitting a functional prosthesis to an insensate limb and the rehabilitation stages leading to functional ambulation are reviewed. PMID:10992814

  10. Biomechanical analysis of transfemoral amputee’s sprint running and block start

    OpenAIRE

    Ojala, Emilia

    2012-01-01

    Ojala, Paula Emilia, 2012. Biomechanical analysis of transfemoral amputee’s sprint running and block start. Department of Biology of Physical Activity, University of Jyväskylä, Master’s Thesis in Biomechanics. 87 p. Although a large number of studies about human locomotion have been reported, little is known about how to run with a prosthesis limb. The purpose of the study was to examine the difference between the healthy and prosthesis leg and between different prostheses during the spri...

  11. Transfemoral digital subtraction aortography

    International Nuclear Information System (INIS)

    The ionic monomer, sodium diatrizoate at 150 mg I/ml (726 mosmol/kg) and the non-ionic monomer, iopamidol, diluted to the same iodine concentration but at 324.3 mosmol/kg, were randomly allocated to patients undergoing transfemoral intra-arterial digital subtraction angiography for lower limb peripheral vascular disease. The agents produced images of comparable quality and diagnostic efficacy. There were no significant differences between the media regarding sensations of pain and warmth. Minor neurological symptoms (headache and dizziness) occurred 7 times more frequently with the ionic monomer. There was a slight but temporary rise in plasma potassium one hour after injection of the ionic monomer but no evidence of appreciable intravascular haemolysis. The nonionic monomer caused a slight fall in haemoglobin and haemotocrit one hour after injection which is attributed to osmotic haemodilution. It is concluded that a diluted high osmolar contrast agent is an acceptable alternative to a low osmolar agent in transfemoral digital subtraction lower limb aortography. (orig.)

  12. Assessment of Gait Symmetry in Transfemoral Amputees Using C-Leg Compared With 3R60 Prosthetic Knees

    DEFF Research Database (Denmark)

    Petersen, Andreas Overbeck; Comins, Jonathan David; Alkjaer, T

    2010-01-01

    The objective of the study was to investigate gait symmetry in transfemoral amputees using a hydraulic- and a microprocessor-controlled knee prosthesis. An A-B design with repeated measurements was chosen, and the measurements were carried out at a prosthetics/orthotics rehabilitation center. Nine...... unilateral transfemoral C-Leg bearing amputees participated in the study, of whom five subjects completed the study. Three-dimensional inverse dynamic gait analysis was performed on each subject. Each subject was then fitted with a 3R60 prosthesis. After a 1-week acclimation period, gait analysis was...... performed on the 3R60 prosthesis. The outcome measures were temporospatial symmetry, duration of single support on the sound side and the prosthetic side, and the introduced butterfly symmetry ratio. Spatial symmetry was not significantly different between the two prosthetic knees. Temporal symmetry was not...

  13. Numerical analysis of an osseointegrated prosthesis fixation with reduced bone failure risk and periprosthetic bone loss

    NARCIS (Netherlands)

    Tomaszewski, P. M.; van Diest, M.; Bulstra, S. K.; Verdonschot, N.; Verkerke, G. J.

    2012-01-01

    Currently available implants for direct attachment of prosthesis to the skeletal system after transfemoral amputation (OPRA system. Integrum AB, Sweden and ISP Endo/Exo prosthesis, ESKA Implants AG, Germany) show many advantages over the conventional socket fixation. However, restraining biomechanic

  14. Numerical analysis of an osseointegrated prosthesis fixation with reduced bone failure risk and periprosthetic bone loss.

    NARCIS (Netherlands)

    Tomaszewski, P.K.; Diest, M. van; Bulstra, S.K.; Verdonschot, N.J.; Verkerke, G.J.

    2012-01-01

    Currently available implants for direct attachment of prosthesis to the skeletal system after transfemoral amputation (OPRA system, Integrum AB, Sweden and ISP Endo/Exo prosthesis, ESKA Implants AG, Germany) show many advantages over the conventional socket fixation. However, restraining biomechanic

  15. Piezoelectric Bimorphs’ Characteristics as In-Socket Sensors for Transfemoral Amputees

    Directory of Open Access Journals (Sweden)

    Amr M. El-Sayed

    2014-12-01

    Full Text Available Alternative sensory systems for the development of prosthetic knees are being increasingly highlighted nowadays, due to the rapid advancements in the field of lower limb prosthetics. This study presents the use of piezoelectric bimorphs as in-socket sensors for transfemoral amputees. An Instron machine was used in the calibration procedure and the corresponding output data were further analyzed to determine the static and dynamic characteristics of the piezoelectric bimorph. The piezoelectric bimorph showed appropriate static operating range, repeatability, hysteresis, and frequency response for application in lower prosthesis, with a force range of 0–100 N. To further validate this finding, an experiment was conducted with a single transfemoral amputee subject to measure the stump/socket pressure using the piezoelectric bimorph embedded inside the socket. The results showed that a maximum interface pressure of about 27 kPa occurred at the anterior proximal site compared to the anterior distal and posterior sites, consistent with values published in other studies. This paper highlighted the capacity of piezoelectric bimorphs to perform as in-socket sensors for transfemoral amputees. However, further experiments are recommended to be conducted with different amputees with different socket types.

  16. TAVI in the case of preexisting mitral prosthesis: tips & tricks and literature review.

    Science.gov (United States)

    Vavuranakis, Manolis; Vrachatis, Dimitrios A; Kariori, Maria G; Moldovan, Carmen; Kalogeras, Konstantinos; Lavda, Maria; Aznaouridis, Konstantinos; Stefanadis, Christodoulos

    2014-11-01

    Very limited data exist on transcatheter aortic valve implantation (TAVI) in the setting of a preexisting mitral prosthesis regarding the technique, potential complications, and outcomes. Here, we report two cases of transfemoral TAVI with a self-expanding bioprosthesis (CoreValve; Medtronic, Inc) in patients who had previously undergone mitral valve replacement (one with an Omniscience and one with a St. Jude prosthesis). A brief literature review is also presented. PMID:25364003

  17. Prosthesis coupling

    Science.gov (United States)

    Reswick, J. B.; Mooney, V.; Bright, C. W.; Owens, L. J. (Inventor)

    1979-01-01

    A coupling for use in an apparatus for connecting a prosthesis to the bone of a stump of an amputated limb is described which permits a bio-compatible carbon sleeve forming a part of the prosthesis connector to float so as to prevent disturbing the skin seal around the carbon sleeve. The coupling includes a flexible member interposed between a socket that is inserted within an intermedullary cavity of the bone and the sleeve. A lock pin is carried by the prosthesis and has a stem portion which is adapted to be coaxially disposed and slideably within the tubular female socket for securing the prosthesis to the stump. The skin around the percutaneous carbon sleeve is able to move as a result of the flexing coupling so as to reduce stresses caused by changes in the stump shape and/or movement between the bone and the flesh portion of the stump.

  18. Dosimetric influence of hip prosthesis during radiotherapeutic treatment

    International Nuclear Information System (INIS)

    As the population become aged, many patients with hip prosthesis are treated for a pelvic cancer. The recommended ballistic must avoid to pass in the prosthesis, but sometimes it is inevitable. So it is essential to quantify with accuracy the dose modifications linked to the presence of metallic implant. The aim of this study is to analyze by Monte Carlo method these modifications in simple and complex models (anthropomorphic phantom) which take into account the geometry and the composition of the prosthesis and its coatings. Then, this methodology was used to study the behaviour of a treatment planning system in theses extreme conditions. (authors)

  19. Vascular Complications and Bleeding After Transfemoral Transcatheter Aortic Valve Implantation Performed Through Open Surgical Access.

    Science.gov (United States)

    Leclercq, Florence; Akodad, Mariama; Macia, Jean-Christophe; Gandet, Thomas; Lattuca, Benoit; Schmutz, Laurent; Gervasoni, Richard; Nogue, Erika; Nagot, Nicolas; Levy, Gilles; Maupas, Eric; Robert, Gabriel; Targosz, Frederic; Vernhet, Hélène; Cayla, Guillaume; Albat, Bernard

    2015-11-01

    Major vascular complications (VC) remain frequent after transcatheter aortic valve implantation (TAVI) and may be associated with unfavorable clinical outcomes. The objective of this study was to evaluate the rate of VC after transfemoral TAVI performed using an exclusive open surgical access strategy. From 2010 to 2014, we included in a monocentric registry all consecutive patients who underwent transfemoral TAVI. The procedures were performed with 16Fr to 20Fr sheath systems. VC were evaluated within 30 days and classified as major or minor according to the Valve Academic Research Consortium 2 definition. The study included 396 patients, 218 were women (55%), median age was 85 years (81 to 88), and the median logistic Euroscore was 15.2% (11 to 23). The balloon-expandable SAPIEN XT and the self-expandable Medtronic Core Valve prosthesis were used in 288 (72.7%) and 108 patients (27.3%), respectively. The total length of the procedure was 68 ± 15 minutes including 13 ± 5 minutes for the open surgical access. Major and minor VC were observed in 9 (2.3%) and 16 patients (4%), respectively, whereas life-threatening and major bleeding concerned 18 patients (4.6%). The median duration of hospitalization was 5 days (interquartile range 2 to 7), significantly higher in patients with VC (7 days [5 to 15], p strategy, with a particular advantage observed in high-risk bleeding patients. PMID:26414600

  20. Numerical evaluation of bone remodelling associated with trans-femoral osseointegration implant--A 68 month follow-up study.

    Science.gov (United States)

    Xu, D H; Crocombe, A D; Xu, W

    2016-02-01

    Osseointegrated trans-femoral implant is a relatively new orthopaedic anchoring method for connecting a stump with a prosthesis. Through a follow-up study of a patient over six years, significant bone remodelling has been observed. Finite element (FE) simulations were carried out to investigate the relationship between the bone remodelling and the strain re-distribution around the trans-femoral osseointegrated implant system. An initial FE model representing the original status of the femur-implant assembly was created from CT scans of the subject prior to osseointegration. Follow-up X-ray images were acquired at various stages post-surgery, which allowed the changes in bone wall thickness to be measured. By updating the bone thickness in the initial model, a series of follow-up FE models were created. Representative load associated with the subject's body weight was applied to the models, and the strain re-distributions were calculated. The results showed that in order to minimise the adverse effect of bone remodelling, an osseointegration implant made by functionally gradient materials are preferred over homogeneous materials. PMID:26776932

  1. Prosthesis Material

    Science.gov (United States)

    2004-01-01

    In this photograph, Amputee Amie Bradly uses a NASA-developed prosthesis to paint her fingernails. Derived from foam insulation technology used to protect the Space Shuttle External Tank from excessive heat, FAB/CAD, a subsidiary of the Harshberger Prosthetic and Orthotic Center, utilized the technology to replace the heavy, fragile plaster they used to produce master molds for prosthetics. The new material was lighter, cheaper and easier to manufacture than plaster, resulting in lower costs to the customer.

  2. Complications of Transfemoral Removal of Percutaneous Transfemorally Implanted Port-Catheter Systems

    International Nuclear Information System (INIS)

    Our purpose is to evaluate the feasibility and safety of the withdrawal procedure of percutaneous transfemorally implanted port-catheter systems. Thirty-seven patients (17.7%) underwent the withdrawal procedure of this port-catheter system among 209 patients. The reasons for withdrawal were as follows: termination of intra-arterial chemotherapy (n = 7), obstruction of hepatic artery (n = 5), port infection (n = 4), catheter infection (n = 4), catheter obstruction (n = 4), lower-limb palsy and pain (n = 2), exposure of the port due to skin defect (n = 2), patient's desire (n = 2), side effect of chemotherapy (n = 1), no effectiveness of chemotherapy (n = 1), hematoma at the puncture site (n = 1), duodenum perforation by the catheter (n = 1), intermittent claudication due to severe stenosis of right common iliac artery (n = 1), dissection of common hepatic artery (n = 1), and broken catheter (n = 1). In thirty-four of the 37 cases, the port-catheter system was successfully withdrawn without any complications. Clinical success rate was 91.9%. Complications occurred in three cases (8.1%), which were a pseudoaneurysm, thromboembolism of the right common iliac artery, and continuous bleeding from the subcutaneous pocket where the port system was placed for 1 month. In 15 cases, correction of the catheter tip or exchange for dislocation of the tip had to be done without withdrawal. It is not rare to withdraw port-catheter systems in cases of infection or hematoma around the system. Although withdrawal of a percutaneous transfemorally implanted port-catheter system is a relatively safe procedure, the port-catheter system should not be removed unless absolutely indicated

  3. Replacement of a Dislocated Aortic Prosthesis After Transcatheter Valve Implantation.

    Science.gov (United States)

    Mandegar, Mohammad Hossein; Moradi, Bahieh; Roshanali, Farideh

    2016-06-01

    A 77-year-old woman who had severe symptomatic aortic stenosis and was a high risk for conventional surgery underwent transcatheter aortic valve implantation by means of the transfemoral approach. The prosthesis migrated and became embolized in the left ventricle after inflation, causing interference with the mitral valve and also partial outflow tract obstruction. The patient was emergently transferred to the operating room. Vertical aortotomy was performed under cardiopulmonary bypass, and the calcified native leaflets were removed. The migrated Edwards SAPIEN XT valve was extracted and subsequently successfully sewn into the annulus after examination for leaflet and stent competence. The hemodynamic performance of the implanted valve was surprisingly more favorable than that of the conventional tissue prosthesis. PMID:27211978

  4. Design and characterization of a powered elbow prosthesis.

    Science.gov (United States)

    Bennett, Daniel A; Mitchell, Jason; Goldfarb, Michael

    2015-08-01

    This paper describes the design of a powered elbow prosthesis, which incorporates a belt and cable drive transmission with a brushless DC motor to achieve an output torque of approximately 18.4 Nm, a backdrive torque of 1.5 Nm, and a speed of up to 360 deg/s while remaining within the anthropomorphic envelope with regard to mass and size. The measured torque and speed of the prosthesis is commensurate with nominal capability of the natural limb (for purposes of performing activities of daily living). PMID:26736791

  5. Natural frequency analysis of osseointegration for trans-femoral implant.

    Science.gov (United States)

    Shao, F; Xu, W; Crocombe, A; Ewins, D

    2007-05-01

    Osseointegration trans-femoral implants are a new orthopaedic anchoring method to attach prosthetic limbs. The clinical success of this promising technique depends on the effectiveness of osseointegration achieved after implantation. The aim of this study is to use the resonant characteristics of the implant system to determine the changes in stability as a reflection of boundary condition of the implant. With a small mechanical excitation, Vibration responses of the trans-femoral implant to a small mechanical excitation were measured using an accelerometer and the vibration signal was analyzed using Fast Fourier Transform (FFT) software to obtain the fundamental natural frequency (NF) of the implant system. In-vitro study was conducted using different silicone rubbers to simulate the interface condition. The result showed that a high NF corresponded to a high elastic modulus of the interface material between the implant and bone. A preliminary in-vivo study with one osseointegration trans-femoral implant patient showed that there was a decrease of NF after initial weight bearing rehabilitation. After continued weight bearing, the NF gradually returned to the pre-loading level at around day 24 and the general trend of the NF reached a stable state 38 days after the first weight bearing exercise. PMID:17377843

  6. Investigating human infant anthropomorphism in products

    NARCIS (Netherlands)

    Hellen, K.; Saaksjarvi, M.C.

    2012-01-01

    In this paper we set out to investigate the nature and effects of infant anthropomorphism in products, i.e. products that share features of human infants. Across four studies, evidence suggests that infant anthropomorphism comprise four dimensions: sweetness, simplicity, sympathy, and smallness. We

  7. Biomechanical and clinical evaluation of a newly designed polycentric knee of transfemoral prosthesis.

    Science.gov (United States)

    Yokogushi, Kazutoshi; Narita, Hiroshi; Uchiyama, Eiichi; Chiba, Susumu; Nosaka, Toshiya; Yamakoshi, Ken-ichi

    2004-09-01

    We have designed a new polycentric knee adopting a hydraulic unit and an intelligent mechanism. The biomechanical parameters of this prototype, such as the stance duration, peak knee flexion angle in stance and swing, peak hip flexion angle, and peak hip extension moments were analyzed at three different cadences (88, 96, 104 steps/min) in three amputees, and then compared to those of polycentric hydraulic knees currently in use. The same parameters were also measured for 10 healthy volunteers and subsequently analyzed. In the prototype, almost all the values of the parameters showed no significant variety in individuals at the different cadences. The situation was the same with the healthy volunteers. However, the values of the parameter for the conventional knee varied significantly with the individual at the different cadences. The prototype may be of practical use, contributing to a stable walk even at different cadences. PMID:15558397

  8. Taper Hip Prosthesis

    Medline Plus

    Full Text Available Zimmer M/L Taper Hip Prosthesis with Modular Neck Kinectiv® Technology March 12, 2009 7:00 PM EDT Welcome to this "OR Live" Webcast presentation brought to ... approximately one centimeter to the shoulder of my prosthesis. And then I will simply use the prosthesis ...

  9. A versatile variable anthropomorphic phantom

    International Nuclear Information System (INIS)

    The technique of in vivo neutron activation analysis is used in whole-body determination of some of the bulk elements. The gamma radiation emitted is compared with that from anthropomorphic phantoms containing known amounts of the elements, and matching particular patients in size and shape. An inexpensive variable phantom can be quickly constructed from between 50 and 100 very flexible sealed polythene tubes containing aqueous solutions of the elements being studied. Bundles of tubes are formed into limbs and trunk by wrapping in polythene sheeting joined with adhesive tape. Although each part maintained its size and shape over a period of a few days, distortion did occur over longer periods. It is possible to insert simulated organs or radiation probes at any position in the phantom. (U.K.)

  10. Tomographic anthropomorphic models. Pt. 1

    International Nuclear Information System (INIS)

    The first generation of heterogenoeous anthropomorphic mathematical models to be used in dose calculations was the MIRD-5 adult phantom, followed by the pediatric MIRD-type phantoms and by the GSF sex-specific phantoms ADAM and EVA. A new generation of realistic anthropomorphic models is now introduced. The organs and tissues of these models consist of a well defined number of volume elements (voxels), derived from computer tomographic (CT) data; consequently, these models were named voxel or tomographic models. So far two voxel models of real patients are available: one of an 8 week old baby and of a 7 year old child. For simplicity, the model of the baby will be referred to as BABY and that of the child as CHILD. In chapter 1 a brief literature review is given on the existing mathematical models and their applications. The reasons that lead to the construction of the new CT models is discussed. In chapter 2 the technique is described which allows to convert any physical object into computer files to be used for dose calculations. The technique which produces three dimensional reconstructions of high resolution is discussed. In chapter 3 the main characteristics of the models of the baby and child are given. Tables of organ masses and volumes are presented together with three dimensional images of some organs and tissues. A special mention is given to the assessment of bone marrow distribution. Chapter 4 gives a short description of the Monte Carlo code used in conjunction with the models to calculate organ and tissue doses resulting from photon exposures. Some technical details concerning the computer files which describe the models are also given. (orig./HP)

  11. Anthropomorphism and Teleology in Reasoning about Biological Phenomena.

    Science.gov (United States)

    Tamir, Pinchas; Zohar, Anat

    1991-01-01

    Reports on interviews with 28 high school biology students in Jerusalem concerning teleological and anthropomorphic formulations and reasoning. Results indicate acceptance of anthropomorphic formulations does not imply a prevalence of anthropomorphic reasoning. Most high school students can distinguish between anthropomorphic formulations and…

  12. Balancing of the anthropomorphous robot walking

    Science.gov (United States)

    Devaev, V. M.; Nikitina, D. V.; Fadeev, A. Y.

    2016-06-01

    Anthropomorphic robots are designed a human environment operates: buildings and structures, cabs and etc. The movement of these robots is carried out by walking which provides high throughput to overcome natural and manmade obstacles. The article presents some algorithm results for dynamic walking on the anthropomorphic robot AR601 example. The work is performed according to the Russian Government Program of Competitive Growth of Kazan Federal University.

  13. When to Replace a Prosthesis

    Science.gov (United States)

    ... to Replace a Prosthesis When to Replace a Prosthesis Web Development April 21, 2015 Fact Sheet Last ... workplace, they must be accurately fit with a prosthesis that matches their own anatomy; one that is ...

  14. A Classification Method for User-Independent Intent Recognition for Transfemoral Amputees Using Powered Lower Limb Prostheses.

    Science.gov (United States)

    Young, Aaron J; Hargrove, Levi J

    2016-02-01

    Powered lower limb prosthesis technologies hold the promise of providing greater ability and mobility to transfemoral amputees. Intent recognition systems for these devices may allow amputees to perform automatic, seamless transitions between locomotion modes. Prior studies in which pattern recognition algorithms have been trained to recognize subject-specific patterns within device-mounted sensor data have shown the feasibility of such systems. While effective, these strategies require substantial training regimens. To reduce this training burden, we developed and evaluated user-independent intent recognition systems. A novel mode-specific classification system was developed that allowed each locomotion transition to be statistically considered its own class. Various pattern recognition algorithms were trained with sensor data from a pool of eight lower limb amputees and performance was tested using data on a novel subject. For both user-dependent and user-independent classification, mode-specific classification reduced error ( ) on transitional steps by  ∼ 50% without affecting steady-state classification. Incorporating sensor time history and level-ground walking data from the novel subject into the training data resulted in decreasing errors ( ) on steady-state classification by over 60% without affecting transitional error. These strategies were combined to demonstrate significant overall system improvements from baseline conditions presented in prior research. PMID:25794392

  15. Redefining prosthetic ankle mechanics: non-anthropomorphic ankle design.

    Science.gov (United States)

    LaPrè, Andrew K; Sup, Frank

    2013-06-01

    The moment transferred at the residual limb socket interface of transtibial amputees can be a limiting factor of the comfort and activity level of lower limb amputees. The high pressures seen can be a significant source of pain, as well as result in deep tissue damage. The compensation of the sound limbs causes an asymmetrical gait which can be a contributor of early onset osteoarthritis in the sound limbs. It has been shown that the moment transferred with conventional passive prostheses can be lowered in magnitude by aligning the tibia with ground reaction forces, but this limits the effectiveness of the device. With recent powered prosthetics designed to mimic the missing limb, power can be injected into the gait cycle, but can also be limited by this pressure threshold. This paper shows the results of calculations that suggest that altering the prosthetic ankle mechanism can reduce the socket interface moments by as much as 50%. This supports the development of an active non-anthropomorphic ankle prosthesis which reduces socket interface moments while still injecting substantial power levels into the gait cycle. PMID:24187257

  16. Anthropomorphic Telemanipulation System in Terminus Control Mode

    Science.gov (United States)

    Jau, Bruno M.; Lewis, M. Anthony; Bejczy, Antal K.

    1994-01-01

    This paper describes a prototype anthropomorphic kinesthetic telepresence system that is being developed at JPL. It utilizes dexterous terminus devices in the form of an exoskeleton force-sensing master glove worn by the operator and a replica four finger anthropomorphic slave hand. The newly developed master glove is integrated with our previously developed non-anthropomorphic six degree of freedom (DOF) universal force-reflecting hand controller (FRHC). The mechanical hand and forearm are mounted to an industrial robot (PUMA 560), replacing its standard forearm. The notion of 'terminus control mode' refers to the fact that only the terminus devices (glove and robot hand) are of anthropomorphic nature, and the master and slave arms are non-anthropomorphic. The system is currently being evaluated, focusing on tool handling and astronaut equivalent task executions. The evaluation revealed the system's potential for tool handling but it also became evident that hand tool manipulations and space operations require a dual arm robot. This paper describes the system's principal components, its control and computing architecture, discusses findings of the tool handling evaluation, and explains why common tool handling and EVA space tasks require dual arm robots.

  17. To Compare the Effect of Pre and Post Weight Bearing Anxiety, Depression in Conventional and Modular Prosthesis on Unilateral Transtibial Amputees

    Directory of Open Access Journals (Sweden)

    R. Raja

    2014-01-01

    Full Text Available Aims and Objectives: To compare the effect of anxiety and depression on unilateral trans tibial amputees those who are using conventional and modular patellar tendon bearing (PTB prosthesis with stump exercises. Material and Methods: A sample of 40 persons with below knee amputation who were trained to wear prosthesis were studied with an experimental comparative study design. Patients who were admitted at Kempegowda Institute of Medical Sciences and Research Centre, Bangalore, K. S. Hegde Medical Academy and Research Centre Mangalore, (N=150 who underwent unilateral transtibial, transfemoral and other amputations between August 2009 - December 2011. To find out peri and postoperative prosthetic fitting, anxiety and depression level of transtibial amputees who wear conventional and modular PTB prosthesis. 3 years of experimental comparative study reveals that the outcome measures of peri and post-operative anxiety and depression level while using conventional PTB prosthesis with stump exercises and modular PTB prosthesis with stump exercises on unilateral transtibial amputees. Results: The unilateral transtibial amputees who were trained with modular prosthesis along with stump exercises group patients anxiety and depression levels are reduced as compared to the unilateral transtibial amputees who were trained with conventional PTB prosthesis along with stump exercises. There is no significant difference seen in both the groups while giving stump exercises alone. Conclusion: The unilateral transtibial amputees who were trained with modular prosthesis along with stump exercises group, patient’s anxiety and depression levels are reduced drastically.

  18. An improved nipple prosthesis.

    OpenAIRE

    Sainsbury, R.; Walker, V. A.; Smith, P M

    1991-01-01

    A nipple-areola reconstruction of prosthesis completes the process of breast reconstruction. Reconstructions are technically difficult and have poor long-term results, whereas commercial nipple prostheses are unsatisfactory in matching the normal colour and shape. We describe a simple technique for the manufacture of a custom made nipple-areola prosthesis.

  19. Stomatitis sub-prosthesis in patients with superior dental prosthesis

    OpenAIRE

    Antonia Martina Francisco Local; Yoel González Beriau; Ana Gloria Vázquez de León

    2009-01-01

    Background: The stomatitis sub-prosthesis is one of the most frequent changes in hard palate mucous membrane in patients with mucous-supported dental prosthesis. It can be caused by multiple factors, which makes its study and prognosis more difficult. Objective: To describe the occurrence of stomatitis sub-prosthesis and its causes in patients with superior dental prosthesis. Method: Descriptive study including all the patients with superior dental prosthesis examined in the odontology consul...

  20. Custom-made ocular prosthesis

    OpenAIRE

    Rajkumar Gunaseelaraj; Suma Karthikeyan; Kumar, Mohan N.; T Balamurugan; Jagadeeshwaran, A. R.

    2012-01-01

    An ocular defect may affect a patient psychologically. An ocular prosthesis is given to uplift the patient psychologically and improve the confidence. Ocular prosthesis can be custom made or a stock shell. To improve the comfort and matching of the prosthesis with that of the adjacent natural eye an custom made ocular prosthesis is preferred. Different techniques are available to fabricate a custom ocular prosthesis, here we have used paper iris disk technique.

  1. The Angelchik prosthesis

    International Nuclear Information System (INIS)

    The Angelchik prosthesis is used in the surgical treatment of gastroesophageal reflux. Operated patients are preliminary examined with imaging techniques, but manometric and acidometric techniques are also used. Although the conventional esophagogram still maintains its diagnostic significance, Computed Tomography (CT) has become the first-choice imaging modality. CT allows the correct evaluation of both the state of the prosthesis and its relationship to the esophagus and gastric fundus. The possible postoperative complications following an incorrect placement of the prosthesis can be accurately diagnosed too. The authors report their experience in the study of 5 patients examined with both conventional radiology and CT

  2. Taper Hip Prosthesis

    Medline Plus

    Full Text Available ... L Taper Hip Prosthesis with Modular Neck Kinectiv® Technology March 12, 2009 7:00 PM EDT Welcome ... hopefully you will see the benefits and the advantages of the new Zimmer Kinectiv System. Thank you. ...

  3. Taper Hip Prosthesis

    Medline Plus

    Full Text Available Zimmer M/L Taper Hip Prosthesis with Modular Neck Kinectiv® Technology March 12, 2009 7:00 PM EDT Welcome to this "OR Live" Webcast presentation brought to you by Zimmer. During ...

  4. Revisiting the Effect of Anthropomorphizing a Social Cause Campaign.

    Directory of Open Access Journals (Sweden)

    Lisa A Williams

    Full Text Available Recent research suggests that anthropomorphism can be harnessed as a tool to boost intentions to comply with social cause campaigns. Drawing on the human tendency to extend moral concern to entities portrayed as humanlike, it has been argued that adding personified features to a social campaign elevates anticipated guilt at failing to comply, and this subsequently boosts intentions to comply with that campaign. The present research aimed to extend extant research by disentangling the effects of emotional and non-emotional anthropomorphism, and differentiating amongst other emotional mechanisms of the anthropomorphism-compliance effect (namely, anticipated pride and anticipated regret. Experiment 1 (N = 294 compared the effectiveness of positive, negative, and emotionally-neutral anthropomorphized campaign posters for boosting campaign compliance intentions against non-anthropomorphized posters. We also measured potential mechanisms including anticipated guilt, regret, and pride. Results failed to support the anthropomorphism-compliance effect, and no changes in anticipated emotion according to anthropomorphism emerged. Experiments 2 (N = 150 and 3 (N = 196 represented further tests of the anthropomorphism-compliance effect. Despite high statistical power and efforts to closely replicate the conditions under which the anthropomorphism-compliance effect had been previously observed, no differences in compliance intention or anticipated emotion according to anthropomorphism emerged. A meta-analysis of the effects of anthropomorphism on compliance and anticipated emotion across the three experiments revealed effect size estimates that did not differ significantly from zero. The results of these three experiments suggest that the anthropomorphism-compliance effect is fragile and perhaps subject to contextual and idiographic influences. Thus, this research provides important insight and impetus for future research on the applied and theoretical

  5. Vascular Complications Associated with Transfemoral Aortic Valve Replacement.

    Science.gov (United States)

    Hines, George L; Jaspan, Vita; Kelly, Brian J; Calixte, Rose

    2016-06-01

    Background Transfemoral aortic valve replacement (TAVR) is a novel technique for treating aortic stenosis, yet vascular complications are yet to be delineated. Objectives This study aims to study the vascular complications of TAVR with Edwards Sapien valves (Edwards Lifesciences Corp., Irvine, CA). Methods We performed a retrospective evaluation of TAVR patients. Standard demographics, femoral vessel and sheath size, access type (femoral cut-down [FC], percutaneous access [PFA], and iliac conduit [IC]), and treatment method were recorded. Complications were defined by the Valve Academic Research Consortium Criteria. Logistic regression was used for statistical analysis. Results A total of 99 patients underwent TAVR between February 15, 2012 and July 17, 2013 with an Edwards Sapien valve. Out of which, 48 were males with a mean age of 83 ± 7 years. Overall, 33 had FC, 58 had PFA, and 6 had an IC. A total of 17 major (2 aortic and 15 iliac) and 38 minor complications (36 access and 2 emboli) occurred. Aortic complications were managed by open repair (OR, 1) or percutaneous repair (PR, 1). Overall, 12 iliac injuries were managed by PR and 3 by OR. Out of the 33 groin complications in FC patients 8 (24%) were treated by OR, whereas 30 (52%) of the 58 groin complications in PTA patients were treated by PR. There were no differences in transfusion requirements or length of stay. Conclusion Vascular complications of TAVR are common with most being minor, related to access site and causing no immediate sequelae. Iliac injury can be managed by PR or OR. Aortic injury is associated with significant mortality. These findings increase vascular surgeons' awareness of these complications and how to manage them. PMID:27231425

  6. Stomatitis sub-prosthesis in patients with superior dental prosthesis

    Directory of Open Access Journals (Sweden)

    Antonia Martina Francisco Local

    2009-04-01

    Full Text Available Background: The stomatitis sub-prosthesis is one of the most frequent changes in hard palate mucous membrane in patients with mucous-supported dental prosthesis. It can be caused by multiple factors, which makes its study and prognosis more difficult. Objective: To describe the occurrence of stomatitis sub-prosthesis and its causes in patients with superior dental prosthesis. Method: Descriptive study including all the patients with superior dental prosthesis examined in the odontology consultation “Barrio Adentro” in the state of Miranda, Venezuela, from November, 2005 to March, 2006. The analysed variables were: age, sex, stomatitis level, teeth brushing frequency, prosthesis condition and use, palate mucous condition and frequency of odontology consultations. Results: 89 patients were attended, more 50% of them had superior dental prosthesis and presented stomatitis sub-prosthesis; the group between 35 and 59 years was the most affected, mainly females. Sub-prosthesis stomatitis type II was the most common and the main causes included constant use of the prosthesis and loose prosthesis. Buccal hygiene was not adequate in these patients. Most of them declared never attending to the dentist, or just when presenting some particular problem. Conclusion: Stomatitis prevalence was related with incorrect hygiene habits and lack of knowledge; it shows the importance of performing educative tasks to reduce this disease incidence.  

  7. IMPORTANCE OF ILIOPSOAS AND ERECTOR SPINAE MUSCLES IN PREDICTING THE FUNCTIONAL COMPETENCE OF TRANSFEMORAL AMPUTEES

    Directory of Open Access Journals (Sweden)

    Lajja K Rishi

    2014-10-01

    Full Text Available Purpose: Muscle imbalance in transfemoral amputees impair physical mobility and activities of daily living. Aim of this study was to correlate the muscle imbalance with functional competence in transfemoral amputees. Methods: Thirty amputees were evaluated under inclusion criteria and randomly allocated into 2 groups. Group A received stretching(1 week followed by strengthening(3 weeks and in group B strengthening(3 weeks were followed by stretching(1 week . Phase I includes values after 1 week stretching program in group A and 3 weeks strengthening program in group B. Data were recorded at baseline, after phase I completion and end of treatment. Physical mobility was assessed by “Timed up and go” test. Results: Muscle imbalance and physical mobility improved significantly in both groups at the end of treatment. The correlation values of “Timed up and go” test with Iliopsoas and Erector spinae muscle showed significant improvement in both groups. Conclusion: Baseline measurements showed that Iliopsoas and Erector spinae muscles were tight whereas Gluteus maximus and Abdominal muscles were weak in transfemoral amputees. Functional mobility improved after correction of muscle imbalance. Stretching followed by strengthening gave more significant results than vice versa. Good posture in transfemoral amputee prevents muscle dysfunction and improves functional mobility.

  8. Taper Hip Prosthesis

    Medline Plus

    Full Text Available Zimmer M/L Taper Hip Prosthesis with Modular Neck Kinectiv® Technology March 12, 2009 7:00 PM EDT Welcome to this "OR Live" Webcast presentation ... an "OR Live" Webcast on the Kinectiv Total Hip System. At this time, let’s join Dr. Maltry ...

  9. Children's Anthropomorphic and Anthropocentric Ideas about Micro-Organisms

    Science.gov (United States)

    Byrne, Jenny; Grace, Marcus; Hanley, Pam

    2009-01-01

    Different views exist about whether anthropomorphic ideas assist or hinder learning in biology. This paper discusses the anthropomorphic and anthropocentric ideas children have about micro-organisms, and whether they affect their understanding. The research was carried out in primary and secondary schools in the South of England and involved 414…

  10. 21 CFR 892.1370 - Nuclear anthropomorphic phantom.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Nuclear anthropomorphic phantom. 892.1370 Section 892.1370 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES RADIOLOGY DEVICES Diagnostic Devices § 892.1370 Nuclear anthropomorphic...

  11. Design of Experiments for Calibration of Planar Anthropomorphic Manipulators

    OpenAIRE

    Klimchik, Alexandr; Wu, Yier; Caro, Stéphane; Pashkevich, Anatol

    2011-01-01

    The paper presents a novel technique for the design of optimal calibration experiments for a planar anthropomorphic manipulator with n degrees of freedom. Proposed approach for selection of manipulator configurations allows essentially improving calibration accuracy and reducing parameter identification errors. The results are illustrated by application examples that deal with typical anthropomorphic manipulators.

  12. A statistically defined anthropomorphic software breast phantom

    International Nuclear Information System (INIS)

    Purpose: Digital anthropomorphic breast phantoms have emerged in the past decade because of recent advances in 3D breast x-ray imaging techniques. Computer phantoms in the literature have incorporated power-law noise to represent glandular tissue and branching structures to represent linear components such as ducts. When power-law noise is added to those phantoms in one piece, the simulated fibroglandular tissue is distributed randomly throughout the breast, resulting in dense tissue placement that may not be observed in a real breast. The authors describe a method for enhancing an existing digital anthropomorphic breast phantom by adding binarized power-law noise to a limited area of the breast. Methods: Phantoms with (0.5 mm)3 voxel size were generated using software developed by Bakic et al. Between 0% and 40% of adipose compartments in each phantom were replaced with binarized power-law noise (β = 3.0) ranging from 0.1 to 0.6 volumetric glandular fraction. The phantoms were compressed to 7.5 cm thickness, then blurred using a 3 × 3 boxcar kernel and up-sampled to (0.1 mm)3 voxel size using trilinear interpolation. Following interpolation, the phantoms were adjusted for volumetric glandular fraction using global thresholding. Monoenergetic phantom projections were created, including quantum noise and simulated detector blur. Texture was quantified in the simulated projections using power-spectrum analysis to estimate the power-law exponent β from 25.6 × 25.6 mm2 regions of interest. Results: Phantoms were generated with total volumetric glandular fraction ranging from 3% to 24%. Values for β (averaged per projection view) were found to be between 2.67 and 3.73. Thus, the range of textures of the simulated breasts covers the textures observed in clinical images. Conclusions: Using these new techniques, digital anthropomorphic breast phantoms can be generated with a variety of glandular fractions and patterns. β values for this new phantom are comparable

  13. Biocompatibility of Nitinol Stapes Prosthesis

    OpenAIRE

    Röösli, C; P. Schmid; Huber, A. M.

    2011-01-01

    OBJECTIVE: Use of the SMart piston, a nitinol-based, self-crimping prosthesis in stapes surgery may allow improved functional results because of better sound transmission properties at the incus-prosthesis interface because of the elimination of manual crimping. Possible disadvantages include thermal damage or strangulation of the incus and its mucoperiosteum or nickel intolerance. The goal of this study was to morphologically assess the fixation of this prosthesis to the incus, investigate t...

  14. Humanizing machines: Anthropomorphization of slot machines increases gambling.

    Science.gov (United States)

    Riva, Paolo; Sacchi, Simona; Brambilla, Marco

    2015-12-01

    Do people gamble more on slot machines if they think that they are playing against humanlike minds rather than mathematical algorithms? Research has shown that people have a strong cognitive tendency to imbue humanlike mental states to nonhuman entities (i.e., anthropomorphism). The present research tested whether anthropomorphizing slot machines would increase gambling. Four studies manipulated slot machine anthropomorphization and found that exposing people to an anthropomorphized description of a slot machine increased gambling behavior and reduced gambling outcomes. Such findings emerged using tasks that focused on gambling behavior (Studies 1 to 3) as well as in experimental paradigms that included gambling outcomes (Studies 2 to 4). We found that gambling outcomes decrease because participants primed with the anthropomorphic slot machine gambled more (Study 4). Furthermore, we found that high-arousal positive emotions (e.g., feeling excited) played a role in the effect of anthropomorphism on gambling behavior (Studies 3 and 4). Our research indicates that the psychological process of gambling-machine anthropomorphism can be advantageous for the gaming industry; however, this may come at great expense for gamblers' (and their families') economic resources and psychological well-being. PMID:26322589

  15. Clinical study on external carotid artery infusion (trans-femoral) treatment of recurrent nasopharyngeal carcinoma

    International Nuclear Information System (INIS)

    Objective: To evaluate the effect and safety of external carotid artery infusion treatment of recurrent nasopharyngeal carcinoma (NPC). Methods: 20 cases of recurrent NPC (13 male and 7 female, age 36-65 years, mean 50 years) diagnosed by clinical examination (including nasopharyngoscope), serology (VCA-IgA) and imaging (CT, MR) and treated by external carotid artery infusion (trans-femoral) with adriamycin (or epi-adriamycin), cisplatin (or carboplatin), Pingyangmycin and 5-Fluorouracil. Results: Of all the patients, 8 cases (40%) had a complete response (CR), 7 cases (35%) had a partial response (PR). The overall response rate (CR + PR) was 75%. Cumulative survival rates at 1, 3 years were 90% (18/20), 50%(10/20) respectively. No severe side-effects and complications found. Conclusion: External carotid artery infusion (trans-femoral) should be effective and safe in the treatment of recurrent NPC

  16. The stump and the prosthesis.

    OpenAIRE

    Day, H. J.

    1980-01-01

    In performing amputations the surgeon must bear in mind the biomechanical and other constraints of the prosthesis likely to be fitted and, so far as possible, should fashion the stump accordingly. The various types of prosthesis and their features are discussed in relation to amputations of the lower and upper limbs at all levels.

  17. HIT anthropomorphic robotic hand and finger motion control

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Nowadays many anthropomorphic robotic hands have been put forward. These hands emphasize different aspects according to their applications. HIT Anthropomorphic Robotic Hand (ARhand) is a simple,lightweight and dexterous design per the requirements of anthropomorphic robots. Underactuated self-adaptive theory is adopted to decrease the number of motors and weight. The fingers of HIT ARhand with multi phalanges have the same size as those of an adult hand. Force control is realized with the position sensor, joint torque sensor and fingertip torque sensor. From the 3D model, the whole hand, with the low power consumption DSP control board integrated in it, will weigh only 500 g. It will be assembled on a BIT-Anthropomorphic Robot.

  18. Joint prosthesis and method of bone fixation

    NARCIS (Netherlands)

    Oosterom, R.; Van der Pijl, A.J; Bersee, H.E.N.; Van der Helm, F.C.; Herder, J.L

    2006-01-01

    The invention relates to a joint prosthesis (10), for example, a knee joint or shoulder joint prosthesis comprising a first, socket-holding prosthesis part (11) for attachment to a first bone (12) and a second, ball-holding prosthesis part (13) for attachment to a second bone (14) that intermates wi

  19. A Global Obstacle-avoidance Map for Anthropomorphic Arms

    Directory of Open Access Journals (Sweden)

    Cheng Fang

    2014-07-01

    Full Text Available More and more humanoid robots are used in human society, and they face a wide variety of complicated manipulation tasks, which are mainly to be achieved by their anthropomorphic arms. Obstacle avoidance for the anthropomorphic arm must be a fundamental consideration to guarantee the successful implementation of these tasks. Different from traditional methods searching for feasible or optimal collision-free solutions for the anthropomorphic arm, a global obstacle- avoidance map for the whole arm is proposed to indicate the complete set of feasible solutions. In this map, the motion of the arm can be appropriately planned to intuitively control the configuration of the arm in motion. First, the cubic spline function is adopted to interpolate some well-chosen path points to generate a smooth collision-free path for the wrist of the anthropomorphic arm. Second, based on the path function of the wrist, the time and the self-rotation angle of the arm about the “shoulder-wrist” axis are used to parameterize all possible configurations of the arm so that a global two- dimensional map considering the obstacle avoidance can be established. Subsequently, a collision-free self-rotation angle profile of the arm can be well planned. Finally, the joint trajectories of a specific anthropomorphic arm, which correspond to the planned path of the wrist and self-rotation angle profile of the arm, can be solved on the basis of the general kinematic analysis of the anthropomorphic arm, and the specific structure. Several simulations are conducted to verify that the proposed collision-free motion planning method for anthropomorphic arms has some advantages and can be regarded as a convenient and intuitive tool to control the configuration of the anthropomorphic arm in motion, without collision with obstacles in its surroundings.

  20. Development of thyroid anthropomorphic phantoms for use in nuclear medicine

    International Nuclear Information System (INIS)

    The objective of this study was to develop thyroid anthropomorphic phantoms to be used in control tests of medical images in scintillation cameras. The main difference among the phantoms was the neck shape: in the first, called OSCT, it was geometrically shaped, while in the second, called OSAP, it was anthropomorphically shaped. In both phantoms, thyroid gland prototypes, which were made of acrylic and anthropomorphically shaped, were constructed to allow the simulation of a healthy thyroid and of thyroids with hyperthyroidism and hypothyroidism. Images of these thyroid anthropomorphic phantoms were obtained using iodine 131 with an activity of 8.695 MBq. The iodine 131 was chosen because it is widely used in studies of thyroid scintigraphy. The images obtained proved the effectiveness of the phantoms to simulate normal or abnormal thyroids function. These phantoms can be used in medical imaging quality control programs and, also in the training of professionals involved in the analysis of images in nuclear medicine centers. - Highlights: ► Two thyroid phantoms were developed (OSCT and OSAP) with different types of acrylics. ► Thyroid glands were represented anthropomorphically in the both phantoms. ► Different prototypes of thyroid were built of simulate healthy or unhealthy glands. ► Images indicate that anthropomorphic phantoms correctly simulate the thyroid gland

  1. Quality Assurance in Radiotherapy with Anthropomorphic Phantoms

    International Nuclear Information System (INIS)

    Modern conformal treatment planning and delivery, using techniques such as 3-D conformal radiotherapy, intensity modulated radiotherapy and stereotactic body radiotherapy require multiple procedures before the delivery of the prescribed dose. Imaging of the patient, identification of target volumes and organs at risk, calculation of the optimal dose distribution and even quality assurance procedures before the treatment are part of this process. Each step as well as the delivery of the final plan is vulnerable to errors. Anthropomorphic phantoms have been designed to simulate patient anatomy to evaluate treatment planning and delivery. They are mailable, filled with water on site, and contain targets and organs at risk with densities and dimensions similar to human anatomy. Dosimeters are included for the analysis of dose distributions. An analysis of irradiations performed at multiple institutions that failed to meet acceptance criteria is presented. With five distinct designs to perform tests at different body sites and almost ten years of experience, the use of these phantoms allows the identification of errors in the modelling of the beam by the treatment planning system, inaccuracies in dose calculation methods when heterogeneities are taken into account and positioning errors. These phantoms are powerful tools for quality assurance and verification of the treatment delivered to a patient from CT table to treatment couch. (author)

  2. Monte Carlo calculations of the impact of a hip prosthesis on the dose distribution

    International Nuclear Information System (INIS)

    Because of the ageing of the population, an increasing number of patients with hip prostheses are undergoing pelvic irradiation. Treatment planning systems (TPS) currently available are not always able to accurately predict the dose distribution around such implants. In fact, only Monte Carlo simulation has the ability to precisely calculate the impact of a hip prosthesis during radiotherapeutic treatment. Monte Carlo phantoms were developed to evaluate the dose perturbations during pelvic irradiation. A first model, constructed with the DOSXYZnrc usercode, was elaborated to determine the dose increase at the tissue-metal interface as well as the impact of the material coating the prosthesis. Next, CT-based phantoms were prepared, using the usercode CTCreate, to estimate the influence of the geometry and the composition of such implants on the beam attenuation. Thanks to a program that we developed, the study was carried out with CT-based phantoms containing a hip prosthesis without metal artefacts. Therefore, anthropomorphic phantoms allowed better definition of both patient anatomy and the hip prosthesis in order to better reproduce the clinical conditions of pelvic irradiation. The Monte Carlo results revealed the impact of certain coatings such as PMMA on dose enhancement at the tissue-metal interface. Monte Carlo calculations in CT-based phantoms highlighted the marked influence of the implant's composition, its geometry as well as its position within the beam on dose distribution

  3. Fifteen years of experience with Integral-Leg-Prosthesis: Cohort study of artificial limb attachment system

    Directory of Open Access Journals (Sweden)

    Dora-Lisa Juhnke, MD

    2015-08-01

    Full Text Available Integral-Leg-Prosthesis (ILP is a comparatively new attachment system that allows direct skeletal docking of artificial limbs. Between January 1999 and December 2013, 69 patients with transfemoral amputation were fitted with ILPs by a single German surgeon. Device design iterations and surgical techniques evolved during these years. For the purposes of comparison, patients receiving the first two designs and procedure iterations were placed in group 1 and the patients fitted with the final design were placed in group 2. Infection rate and planned and unplanned surgical interventions were statistically compared using Fisher exact test. Data demonstrated that the high rate of stoma-associated infections seen in group 1 was dramatically reduced in group 2. Of the 39 patients with 42 implants in group 2, none had operative interventions secondary to infection. All group 2 patients remained infection-free without the use of antibiotics by following a simple but defined wound-hygiene protocol. We concluded that the final iteration of the osseointegrated intramedullary device with a low energy surface at the soft tissue and prosthesis interface allowed a biologically stable skin stoma that remained infection-free without chronic use of antibiotics. The reduction in the infection rate was attributed to the clinically based, empirically driven changes in design and surgical techniques.

  4. A Cyber Expert System for Auto-Tuning Powered Prosthesis Impedance Control Parameters.

    Science.gov (United States)

    Huang, He; Crouch, Dustin L; Liu, Ming; Sawicki, Gregory S; Wang, Ding

    2016-05-01

    Typically impedance control parameters (e.g., stiffness and damping) in powered lower limb prostheses are fine-tuned by human experts (HMEs), which is time and resource intensive. Automated tuning procedures would make powered prostheses more practical for clinical use. In this study, we developed a novel cyber expert system (CES) that encoded HME tuning decisions as computer rules to auto-tune control parameters for a powered knee (passive ankle) prosthesis. The tuning performance of CES was preliminarily quantified on two able-bodied subjects and two transfemoral amputees. After CES and HME tuning, we observed normative prosthetic knee kinematics and improved or slightly improved gait symmetry and step width within each subject. Compared to HME, the CES tuning procedure required less time and no human intervention. Hence, using CES for auto-tuning prosthesis control was a sound concept, promising to enhance the practical value of powered prosthetic legs. However, the tuning goals of CES might not fully capture those of the HME. This was because we observed that HME tuning reduced trunk sway, while CES sometimes led to slightly increased trunk motion. Additional research is still needed to identify more appropriate tuning objectives for powered prosthetic legs to improve amputees' walking function. PMID:26407703

  5. Joint prosthesis and method of bone fixation

    OpenAIRE

    Oosterom, R; Pijl, A J; Bersee, H.E.N.; Van der Helm, F.C.; Herder, J. L.

    2006-01-01

    The invention relates to a joint prosthesis (10), for example, a knee joint or shoulder joint prosthesis comprising a first, socket-holding prosthesis part (11) for attachment to a first bone (12) and a second, ball-holding prosthesis part (13) for attachment to a second bone (14) that intermates with the first prosthesis part, wherein the first bone and the second bone are situated at either side of a joint, and wherein the ball (2) of the second prosthesis part is rotatably received in the ...

  6. Rapid fabrication of a digital prosthesis.

    Science.gov (United States)

    Rokaya, Dinesh; Amornvit, Pokpong; Shrestha, Binit

    2015-12-01

    Finger prosthesis often needs refabrication due to its discoloration following use. This article presents a novel, economical, and cost-effective technique to duplicate the patient׳s existing prosthesis to obtain a new wax replica, which is then clinically tried and processed to obtain new silicone finger prosthesis. This technique requires comparatively less clinical and laboratory steps as to fabricate an entirely new prosthesis. The newly fabricated silicone finger prosthesis has the fit and marginal adaptation of the patient׳s existing prosthesis but the esthetics is improved. PMID:26684496

  7. ALGORITHM FOR THE PREDICTION OF THE REACTIVE FORCES DEVELOPED IN THE SOCKET OF TRANSFEMORAL AMPUTEES

    Directory of Open Access Journals (Sweden)

    JUAN FERNANDO RAMÍREZ

    2012-01-01

    Full Text Available Se presenta un algoritmo en Matlab 2010a basado en un modelo matemático para predecir los momentos y las fuerzas de reacción en un punto particular del socket vinculado al miembro inferior de un amputado transfemoral. El modelo tiene en cuenta las inercias desarrolladas durante el ciclo de la marcha. Se realiza una validación del modelo comparando los resultados con los datos obtenidos en un laboratorio de análisis de la marcha y se encuentra una buena correspondencia con los datos experimentales en las fases de apoyo y balanceo.

  8. Algorithm for the prediction of the reactive forces developed in the socket of transfemoral amputees

    OpenAIRE

    JUAN FERNANDO RAMÍREZ; EMMANUEL JARAMILLO MUÑOZ; JAIME ANDRÉS VÉLEZ

    2012-01-01

    Se presenta un algoritmo en Matlab 2010a basado en un modelo matemático para predecir los momentos y las fuerzas de reacción en un punto particular del socket vinculado al miembro inferior de un amputado transfemoral. El modelo tiene en cuenta las inercias desarrolladas durante el ciclo de la marcha. Se realiza una validación del modelo comparando los resultados con los datos obtenidos en un laboratorio de análisis de la marcha y se encuentra una buena correspondencia con los datos experiment...

  9. Automatic segmentation of magnetic resonance images of the trans-femoral residual limb.

    Science.gov (United States)

    Douglas, T S; Solomonidis, S E; Lee, V S; Spence, W D; Sandham, W A; Hadley, D M

    1998-12-01

    An automatic algorithm for the extraction of the skin and bone boundaries from axial magnetic resonance images of the residual limb of trans-femoral amputees is presented. The method makes use of K-means clustering and mathematical morphology. Statistical analysis of the results indicates that the computer-generated boundaries compare favourably to those drawn by human observers. The boundaries may be used in biomechanical modelling of the interaction between the residual limb and the prosthetic socket. The limb/socket interface determines the quality of prosthetic fit, therefore knowledge of this interface is important for the improvement of socket design in order to achieve patient comfort and mobility. PMID:10223645

  10. Choosing a Breast Prosthesis: A Survivor's Perspective

    Science.gov (United States)

    ... Survivor’s Perspective Print to PDF Choosing a Breast Prosthesis: A Survivor’s Perspective Andrea Zinn June 16, 2015 · ... did you decide to wear a breast form/prosthesis rather than have a reconstruction? Andrea: After weighing ...

  11. [Central auditory prosthesis].

    Science.gov (United States)

    Lenarz, T; Lim, H; Joseph, G; Reuter, G; Lenarz, M

    2009-06-01

    Deaf patients with severe sensory hearing loss can benefit from a cochlear implant (CI), which stimulates the auditory nerve fibers. However, patients who do not have an intact auditory nerve cannot benefit from a CI. The majority of these patients are neurofibromatosis type 2 (NF2) patients who developed neural deafness due to growth or surgical removal of a bilateral acoustic neuroma. The only current solution is the auditory brainstem implant (ABI), which stimulates the surface of the cochlear nucleus in the brainstem. Although the ABI provides improvement in environmental awareness and lip-reading capabilities, only a few NF2 patients have achieved some limited open set speech perception. In the search for alternative procedures our research group in collaboration with Cochlear Ltd. (Australia) developed a human prototype auditory midbrain implant (AMI), which is designed to electrically stimulate the inferior colliculus (IC). The IC has the potential as a new target for an auditory prosthesis as it provides access to neural projections necessary for speech perception as well as a systematic map of spectral information. In this paper the present status of research and development in the field of central auditory prostheses is presented with respect to technology, surgical technique and hearing results as well as the background concepts of ABI and AMI. PMID:19517084

  12. Three-dimensional finite element stress and strain analysis of a transfemoral osseointegration implant.

    Science.gov (United States)

    Xu, Wei; Xu, Dong Hao; Crocombe, A D

    2006-08-01

    The percutaneous transfemoral osseointegration implant is an alternative technique for direct prosthetic limb attachment. In order to investigate the stress and strain in the transfemoral osseointegration implant system, finite element (FE) analyses were carried out using three-dimensional femur-implant models and the commercial FE software ABAQUS. The three-dimensional femoral model was reconstructed from presurgery CT scans of an above-knee amputee. The implant was then inserted into the femoral model using Boolean operations in CAD software. Under a typical walking load, stress and strain from the femur-implant FE model were investigated. Stress concentrations were found near to the distal and proximal regions of the femur. To study the effect of different contact ratios between femur and implant, FE analyses were carried out using different implant diameters. The results showed that there were local stress variations near the contact discontinuity areas. A comparison was also made between the results of this study and a previous study using axisymmetric FE models. The results of the two studies revealed different stress levels, but good correlation was found in the overall stress distribution. PMID:16961185

  13. Shape-memory alloy overload protection device for osseointegrated transfemoral implant prosthetic limb attachment system

    Science.gov (United States)

    Xu, Wei; Shao, Fei; Hughes, Steven

    2002-11-01

    The osseointegrated trans-femoral implant system provides a direct anchoring technique to attach prosthetic limb. This technique was first introduced PI Brenmark in Sweden. The UK had the first clinical trial in 1997 and currently has 6 active limb wearers. The success of this procedure has the potential for improved gait function and mobility, increased employability and significant long-term improvements in the quality of life for above knee amputees. However, the significant load involved in the trans-femoral implant system has caused permanent deformation and/or fractures of the implant abutment in several occasions. To protect the implant system, the implant abutment in particularly, an overloading protection device was introduced. The device uses mechanical mechanism to release torsion overload on the abutment. However, the bending overload protection remains unsolved. To solve the problem, a new overload protection device was developed. This device uses SMA component for bending overload protection. In this paper, the results of non-linear finite element modelling of the SMA and steel (AISI 1040) components were presented. Experiments were also carried out using steel components to assess the design which is based on the non-linear property of the materials.

  14. Constructional model of internal oesophageal prosthesis

    OpenAIRE

    L.A. Dobrzański; A. Pusz; A. J. Nowak; M. Górniak

    2010-01-01

    Purpose: The aim of this work is to study of constructional model of internal prosthesis of oesophagus with determined functional features; the prosthesis will replace the upper part of the digestive system – the oesophagus.Design/methodology/approach: Constructional model of internal prosthesis of oesophagus was worked out in the basis of physiological build of oesophagus considering surgical techniques.Findings: Development of optimal constructional model of internal prosthesis of oesophagu...

  15. Followup of a Dog with an Intraocular Silicone Prosthesis Combined with an Extraocular Glass Prosthesis

    OpenAIRE

    Gwendolyna Romkes; Johanna Corinna Eule

    2012-01-01

    Because of unpredictable corneal changes, evisceration and implantation of a silicone prosthesis does not always lead to a satisfying cosmetic result. This paper describes the use of an intraocular silicone prosthesis in combination with an extraocular glass prosthesis and shows a followup of two and a half years in a nonexperimental study. An intraocular silicone prosthesis was implanted after evisceration of the left eye in a five-month-old Bernese mountain dog. A glass prosthesis was fitte...

  16. Treatment of hepatic venous stenosis by transfemoral venous balloon dilation following living donor liver transplantation: a case report

    Institute of Scientific and Technical Information of China (English)

    Weiwei Jiang; Yangsui Liu; Lianbao Kong

    2009-01-01

    Hepatic venous stenosis may be a cause of graft failure in living donor liver transplantation (LDLT). Balloon dilation and metallic frame approaches have been used successfully to treat hepatic venous stenosis. Here, we report the effect of transfemoral venous balloon dilation for treating a child with hepatic venous stenosis after LDLT.

  17. A comparative study on transradial vs transfemoral artery access for primary percutaneous coronary intervention in patients with acute myocardial infarction

    Institute of Scientific and Technical Information of China (English)

    傅向华

    2003-01-01

    A comparative study on transradial vs transfemoral artery access for primary percutaneous coronary intervention in patients with acute myocardial infarction!050000$河北医科大学第二医院河北医科大学心脏介入中心@傅向华

  18. Safety and efficacy of using the Viabahn endoprosthesis for percutaneous treatment of vascular access complications after transfemoral aortic valve implantation

    DEFF Research Database (Denmark)

    De Backer, Ole; Arnous, Samer; Sandholt, Benjamin;

    2015-01-01

    -induced vascular injury. Over a 40-month period, 354 patients underwent true percutaneous transfemoral (TF)-TAVI using a CoreValve and Prostar-XL closure system; this was our study population. A VAC leading to acute intervention occurred in 72 patients (20.3%) - of these, 18 were managed by balloon angioplasty, 48...

  19. 21 CFR 878.3550 - Chin prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Chin prosthesis. 878.3550 Section 878.3550 Food... DEVICES GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3550 Chin prosthesis. (a) Identification. A chin prosthesis is a silicone rubber solid device intended to be implanted to augment...

  20. 21 CFR 878.3680 - Nose prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Nose prosthesis. 878.3680 Section 878.3680 Food... DEVICES GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3680 Nose prosthesis. (a) Identification. A nose prosthesis is a silicone rubber solid device intended to be implanted to augment...

  1. 21 CFR 878.3610 - Esophageal prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Esophageal prosthesis. 878.3610 Section 878.3610...) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3610 Esophageal prosthesis. (a) Identification. An esophageal prosthesis is a rigid, flexible, or expandable tubular device...

  2. 21 CFR 876.3750 - Testicular prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Testicular prosthesis. 876.3750 Section 876.3750...) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Prosthetic Devices § 876.3750 Testicular prosthesis. (a) Identification. A testicular prosthesis is an implanted device that consists of a solid or gel-filled...

  3. 21 CFR 878.3590 - Ear prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Ear prosthesis. 878.3590 Section 878.3590 Food and... GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3590 Ear prosthesis. (a) Identification. An ear prosthesis is a silicone rubber solid device intended to be implanted to reconstruct the...

  4. 21 CFR 878.3720 - Tracheal prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Tracheal prosthesis. 878.3720 Section 878.3720...) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3720 Tracheal prosthesis. (a) Identification. The tracheal prosthesis is a rigid, flexible, or expandable tubular device made of a...

  5. Kids See Human Too: Adapting an Individual Differences Measure of Anthropomorphism for a Child Sample

    Science.gov (United States)

    Severson, Rachel L.; Lemm, Kristi M.

    2016-01-01

    The study of anthropomorphism in adults has received considerable interest with the development of the Individual Differences in Anthropomorphism Questionnaire (IDAQ; Waytz, Cacioppo, & Epley, 2010). Anthropomorphism in children--its development, correlates, and consequences--is also of significant interest, yet a comparable measure does not…

  6. 21 CFR 892.1950 - Radiographic anthropomorphic phantom.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Radiographic anthropomorphic phantom. 892.1950 Section 892.1950 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES RADIOLOGY DEVICES Diagnostic Devices § 892.1950 Radiographic...

  7. Prosthesis infections after orthopedic joint replacement

    DEFF Research Database (Denmark)

    Song, Zhijun; Borgwardt, Lotte; Høiby, Niels;

    2013-01-01

    Prosthesis-related infection is a serious complication for patients after orthopedic joint replacement, which is currently difficult to treat with antibiotic therapy. Consequently, in most cases, removal of the infected prosthesis is the only solution to cure the infection. It is, therefore......, important to understand the comprehensive interaction between the microbiological situation and the host immune responses that lead to prosthesis infections. Evidence indicates that prosthesis infections are actually biofilm-correlated infections that are highly resistant to antibiotic treatment and the...... microbiological and surgical measures. Recent progress in research into bacterial biofilm and possible future treatment options of prosthesis-related infections are discussed....

  8. Elektra prosthesis for trapeziometacarpal osteoarthritis

    DEFF Research Database (Denmark)

    Klahn, A; Nygaard, Mads; Gvozdenovic, R;

    2012-01-01

    We present a prospective follow-up of 39 Elektra prostheses in 37 patients (32 women and five men), with a mean age of 56.5 (range 46-71) years; 34 patients had osteoarthritis and three had rheumatoid arthritis. Patients were followed using clinical examination, including measurement of pain on a...... the key problem in treating trapeziometacarpal osteoarthritis using a total prosthesis....

  9. Multiple Neuromas Cause Painful "Jumping Stump" in a Transfemoral Amputee: A Case Report.

    Science.gov (United States)

    Buntragulpoontawee, Montana; Pattamapaspong, Nuttaya; Tongprasert, Siam

    2016-09-01

    Painful "jumping stump" is an uncommon but very disturbing complication postamputation. This condition is one of the movement disorder entities resulting from peripheral nerve pathology, often known as "peripherally induced movement disorders." Previously case reports have been written about painful and nonpainful incidence of "jumping stump"; however, only the earliest "jumping stump" article in 1852 suspected that neuromas might influence the involuntary movement. In this study, we describe a 38-year-old man with bilateral transfemoral amputee who suffered from painful "jumping stump" with multiple neuromas confirmed by imaging. He was treated successfully by ultrasound-guided phenol injection into the sciatic neuroma stalks. The pathophysiology of jumping stump and its possible association with neuroma are briefly discussed. PMID:27440797

  10. Percutaneous management of vascular access in transfemoral transcatheter aortic valve implantation

    Institute of Scientific and Technical Information of China (English)

    Ilaria; Dato; Francesco; Burzotta; Carlo; Trani; Filippo; Crea; Gian; Paolo; Ussia

    2014-01-01

    Transcatheter aortic valve implantation(TAVI) using stent-based bioprostheses has recently emerged as a promising alternative to surgical valve replacement in selected patients. The main route for TAVI is retrograde access from the femoral artery using large sheaths(16-24 F). Vascular access complications are a clinically relevant issue in TAVI procedures since they are reported to occur in up to one fourth of patients and are strongly associated with adverse outcomes. In the present paper, we review the different types of vascular access site complications associated with transfemoral TAVI. Moreover, we discuss the possible optimal management strategies with particular attention to the relevance of early diagnosis and prompt treatment using endovascular techniques.

  11. Evolution of prehension ability in an anthropomorphic neurorobotic arm

    Directory of Open Access Journals (Sweden)

    Gianluca Massera

    2007-11-01

    Full Text Available In this paper, we show how a simulated anthropomorphic robotic arm controlled by an artificial neural network can develop effective reaching and grasping behaviour through a trial and error process in which the free parameters encode the control rules which regulate the fine-grained interaction between the robot and the environment and variations of the free parameters are retained or discarded on the basis of their effects at the level of the global behaviour exhibited by the robot situated in the environment. The obtained results demonstrate how the proposed methodology allows the robot to produce effective behaviours thanks to its ability to exploit the morphological properties of the robot's body (i.e. its anthropomorphic shape, the elastic properties of its muscle-like actuators and the compliance of its actuated joints and the properties which arise from the physical interaction between the robot and the environment mediated by appropriate control rules.

  12. Leap Motion Device Used to Control a Real Anthropomorphic Gripper

    OpenAIRE

    Staretu, Ionel; Moldovan, Catalin

    2016-01-01

    This paper presents for the first time the use of the Leap Motion device to control an anthropomorphic gripper with five fingers. First, a description of the Leap Motion device is presented, highlighting its main functional characteristics, followed by testing of its use for capturing the movements of a human hand’s fingers in different configurations. Next, the HandCommander soft module and the Interface Controller application are described. The HandCommander is a software module created to ...

  13. Anthropomorphic Soft Robotics - from Torque Control to Variable Intrinsic Compliance

    OpenAIRE

    Albu-Schäffer, Alin; Eiberger, Oliver; Fuchs, Matthias; Grebenstein, Markus; Haddadin, Sami; Ott, Christian; Stemmer, Andreas; Wimböck, Thomas; Wolf, Sebastian; Borst, Christoph; Hirzinger, Gerd

    2011-01-01

    The paper gives an overview on the developments at the German Aerospace enter DLR towards anthropomorphic robots which not only try to approach the force and velocity performance of humans, but also have similar safety and robustness features based on a compliant behaviour. We achieve this compliance either by joint torque sensing and impedance control, or, in our newest systems, by compliant mechanisms (so called VIA - variable impedance actuators), whose intrinsic compliance can be adjusted...

  14. Characterization of a novel anthropomorphic plastinated lung phantom

    OpenAIRE

    Yoon, Sungwon; Henry, Robert W.; Bouley, Donna M.; Bennett, N. Robert; Fahrig, Rebecca

    2008-01-01

    Phantoms are widely used during the development of new imaging systems and algorithms. For development and optimization of new imaging systems such as tomosynthesis, where conventional image quality metrics may not be applicable, a realistic phantom that can be used across imaging systems is desirable. A novel anthropomorphic lung phantom was developed by plastination of an actual pig lung. The plastinated phantom is characterized and compared with reference to in vivo images of the same tiss...

  15. Management system compliance regime equilibrium anthropomorphic walking machine

    OpenAIRE

    Ткач, Михайло Мартинович

    2014-01-01

    The paper provides a solution to the problem of the control system compliance regime equilibrium anthropomorphic walking machine on any solid surface by applying the principle of tracking the movement of the point of the center of mass system and the reaction force supporting surface. Used the concept of a distributed control system with the optimal criterion of balancing and adjusting the current position AKA by solving the inverse kinematics problem using adaptive neuro-fuzzy network foreca...

  16. Optimal design of a six-bar linkage with one degree of freedom for an anthropomorphic three-jointed finger mechanism.

    Science.gov (United States)

    Guo, G; Zhang, J; Gruver, W A

    1993-01-01

    This research concerns the design of a three-jointed, anthropomorphic, finger mechanism for use as a prosthesis or robotic end-effector. Based on a study of finger configurations for the human hand, a six-bar linkage with one degree of freedom is proposed. A model of the fingertip displacement of the mechanism is derived by a vector analysis approach. The effects of joint friction on the transmission efficiency are analysed. By measuring the joint positions of a human finger, a mathematical model of the pinching and holding configurations are developed. Optimal parameters for the finger mechanism are obtained by non-linear programming based on an objective functional involving motion posture and locus, transmission efficiency and weight subject to geometric and bionic constraints. Simulation results indicate that the mechanism is useful for a variety of prosthetic and robotic applications. PMID:8117370

  17. Women's Satisfaction with Their Breast Prosthesis: What Determines a Quality Prosthesis?

    Science.gov (United States)

    Livingston, Patricia M.; White, Victoria M.; Roberts, Susan B.; Pritchard, Emma; Hayman, Jane; Gibbs, Anne; Hill, David J.

    2005-01-01

    The aim of this study is to determine what factors constitute a quality prosthesis and ascertain which factors affect prosthesis satisfaction. Sixty-four women who received full funding for their prosthesis and 38 women who received their hospital's usual funding were recruited. Women rated the information provided about breast prostheses very…

  18. Techniques for Evaluating the Fit of Removable and Fixed Prosthesis

    OpenAIRE

    K Kamalakanth Shenoy; Shetty, Mallika S.

    2011-01-01

    The importance of an accurately fitting fixed prosthesis or a removable prosthesis is essential for the success of the restoration. Ill-fitting prosthesis may cause mechanical failures of the prosthesis, implant systems, or biologic complications of the surrounding tissue. There are several causes related to improper seating of the prosthesis. Some of which can be corrected and the others need to be repeated. Hence the clinician must carefully evaluate the adaptation of the prosthesis using t...

  19. Dosimetry of a silicone breast prosthesis

    International Nuclear Information System (INIS)

    Dose measurements were conducted in a phantom which simulates breast tissue and in another phantom which simulates a breast containing a silicone prosthesis. No detectable difference was found when the irradiations were carried out with tangential beams of 60Co radiation. The degree of backscatter and absorption of radiation by the prosthesis and phantom were also similar. A slight decrease in dose of approximately 8% was found at the interface between the prosthesis and muscle-equivalent material

  20. Practical Artifact Cancellation for Myoelectric Prosthesis Control

    OpenAIRE

    Sæther, Marthe

    2008-01-01

    Prostheses are artificial body parts that can be used by amputees. Myoelectric prostheses are controlled by so-called surface electromyograms (sEMG) that are acquired on the skin surface of the residual limb. A well-known problem in myoelectric prostheses is motion artifacts, these artifacts cause unwanted behaviour of the prosthesis. The purpose of this study is to try to cancel the effect motion artifacts have on myoelectric prosthesis control, in order to avoid unsolicited prosthesis be...

  1. Stretch due to Penile Prosthesis Reservoir Migration

    OpenAIRE

    Baten, E.; Vandewalle, T.; van Renterghem, K.

    2016-01-01

    A 43-year old patient presented to the emergency department with stretch, due to impossible deflation of the penile prosthesis, 4 years after successful implant. A CT-scan showed migration of the reservoir to the left rectus abdominis muscle. Refilling of the reservoir was inhibited by muscular compression, causing stretch. Removal and replacement of the reservoir was performed, after which the prosthesis was well-functioning again. Migration of the penile prosthesis reservoir is extremely ra...

  2. Cementless isoelastic RM total hip prosthesis1

    OpenAIRE

    Bombelli, Renato; Mathys, Robert

    1982-01-01

    Some surgeons are beginning to doubt the reliability of bone cement in joint replacements. In 1967 Robert Mathys conceived the idea of an isoelastic prosthesis made of plastic, which would anchor into the bone without cement. He developed the idea by extensive tests in animals and, in 1973, the first human RM cementless hip prosthesis was inserted by E Morscher. In this paper the concept of the cementless isoelastic prosthesis is developed by Robery Mathys, and Professor Bombelli records his ...

  3. Novel Use of an Apical-Femoral Wire Rail to Assist With Transfemoral Transcatheter Aortic Valve Replacement

    OpenAIRE

    Don, Creighton W.; Kim, Michael S.; Verrier, Edward D.; Aldea, Gabriel S.; Dean, Larry S.; Reisman, Mark; Mokadam, Nahush A

    2014-01-01

    The inability to reposition or retrieve balloon-expandable transcatheter aortic valves once they have been deployed requires implantation of the valve in the descending aorta or open surgical procedures to extract the valve. We describe the challenging transfemoral delivery of an Edwards Lifesciences Sapien valve wherein we had difficulty crossing the aortic valve and the guidewire position was compromised. We performed a transapical puncture to snare the guidewire and create a left ventricul...

  4. Hip painful prosthesis: surgical view

    OpenAIRE

    SPINARELLI, ANTONIO; Patella, Vittorio; Conserva, Vito; Vicenti, Giovanni; Pesce, Vito; Patella, Silvio

    2011-01-01

    Painful hip prosthesis is the most feared immediate and remote complication of a primary implant and usually represents the failure of one or more therapeutic moments. In cases of aseptic implant failure, the causes invoked may be represented by an incorrect indication, the quality of materials, local and general condition of the patient and especially from a bad joint biomechanics. In cases of septic loosening, however, the cause of failure to be found in the location of pathogens within the...

  5. A New Cone-Shaped Aortic Valve Prosthesis for Orthotopic Position: An Experimental Study in Swine

    International Nuclear Information System (INIS)

    The aim of this experimental study was to evaluate a newly designed cone-shaped aortic valve prosthesis (CAVP) for one-step transcatheter placement in an orthotopic position. The study was conducted in 15 swine using either the transcarotid (11 animals) or the transfemoral (4 animals) artery approach. A 12- or 13-Fr sheath was inserted via arterial cutdown. The CAVP was deployed under fluoroscopic control and its struts, by design, induced significant native valve insufficiency. CAVP function was evaluated by aortography and aortic pressure curve tracing. In 11 of 15 swine the CAVP was properly deployed and functioned well throughout the scheduled period of 2-3 h. In three swine the CAVPs were placed lower than intended, however, they were functional even in the left ventricular outflow tract position. One swine expired due to inadvertent low CAVP placement that caused both aortic regurgitation and immobilization of the anterior mitral valve leaflet by the valve struts. We conclude that this design of CAVP is relatively easy to deploy, works well throughout a short time period (2-3 h), and, moreover, seems to be reliable even in a lower-than-orthotopic position (e.g., infra-annulary space). Longer-term studies are needed for its further evaluation.

  6. Contact dermatitis from a prosthesis.

    Science.gov (United States)

    Munoz, Carla A; Gaspari, Anthony; Goldner, Ronald

    2008-01-01

    Patients wearing a prosthesis face a wide variety of medical problems. Skin complications have long been recognized, but their prevalence is still unknown. The most frequently reported disorders are allergic contact dermatitis (ACD), acroangiodermatitis, epidermoid cysts, epidermal hyperplasia, follicular hyperkeratosis, verrucous hyperplasia, bullous diseases, hyperhidrosis, infections, malignancies, and ulcerations. Contact dermatitis represents one-third of the dermatoses in amputees wearing prostheses. All patients who are suspected of having ACD should be patch tested with standard allergen series as well as materials from the patient's own prosthesis, topical medicaments, moisturizers, and cosmetics. We report a patient with an ACD to mixed dialkyl thiourea present in the rubber parts of his below-the-knee prosthesis. Thiourea derivates are used as accelerators in the manufacture of chloroprene rubber and as fixatives in photography and photocopy paper. Allergy to thiourea is relatively uncommon; different studies have shown a prevalence of 0.7% up to 2.4% in patch-tested patients. Thiourea derivates are often the allergic sources in ACD involving high-grade rubber products made of neoprene such as diving suits, protective goggles, knee braces, and continuous positive airway pressure masks. They are also present in the rubber material of prostheses, as in the case of our patient. PMID:18413115

  7. Roomba is not a Robot; AIBO is still Alive! Anthropomorphic Language in Online Forums

    OpenAIRE

    Fink, Julia; Mubin, Omar; Kaplan, Frédéric; Dillenbourg, Pierre

    2011-01-01

    Anthropomorphism describes people’s tendency to ascribe humanlike qualities to non-human artifacts, such as robots. We investigated anthropomorphic language in 750 posts of online forums about the Roomba robotic vacuum cleaner, the AIBO robotic dog and the iPad tablet computer. Results of this content analysis suggest a significant difference for anthropomorphic language usage among the three technologies. In contrast to Roomba and iPad, the specific characteristics of the robotic dog enhance...

  8. The human-animal bond: role of anthropomorphism in diversity and variation

    OpenAIRE

    Adams, Judith C.; McBride, E. Anne; Carr, A; Carnelly, K.

    2010-01-01

    Adams et.al (2007) suggested a predictive model based on the dimensions of empathy, attachment and sexual attraction to differentiate between zoophilia and bestiality (animal sexual abuse). This paper develops this model by considering the role of anthropomorphism. It is known that anthropomorphism changes ‘normal’ care giving practices of pet owners (White, 2007). We suggest that anthropomorphism may have a significant effect on the human – animal bond by blurring the lines between sensual ...

  9. Anthropomorphism of belief: An attempt based on the works of Feuerbach, Freud and Guthrie

    OpenAIRE

    Kjartan Þór Ingvarsson 1981

    2009-01-01

    The aim of this thesis is to explore the anthropomorphism of belief. The main questions are: Is a theory explicating religion on the grounds of anthropomorphism possible? How could one explain the need for belief and where it comes from? How does religion mirror fundamental aspects of being within the world? Theories explaining religion as anthropomorphism have been proposed, most noticeably and comprehensively, by Ludwig Feuerbach in his books, The Essence of Religion and The Essence of Chri...

  10. Development of a physical 3D anthropomorphic breast phantom

    International Nuclear Information System (INIS)

    Purpose: Develop a technique to fabricate a 3D anthropomorphic breast phantom with known ground truth for image quality assessment of 2D and 3D breast x-ray imaging systems. Methods: The phantom design is based on an existing computer model that can generate breast voxel phantoms of varying composition, size, and shape. The physical phantom is produced in two steps. First, the portion of the voxel phantom consisting of the glandular tissue, skin, and Cooper's ligaments is separated into sections. These sections are then fabricated by high-resolution rapid prototyping using a single material with 50% glandular equivalence. The remaining adipose compartments are then filled using an epoxy-based resin (EBR) with 100% adipose equivalence. The phantom sections are stacked to form the physical anthropomorphic phantom. Results: The authors fabricated a prototype phantom corresponding to a 450 ml breast with 45% dense tissue, deformed to a 5 cm compressed thickness. Both the rapid prototype (RP) and EBR phantom materials are radiographically uniform. The coefficient of variation (CoV) of the relative attenuation between RP and EBR phantom samples was <1% and the CoV of the signal intensity within RP and EBR phantom samples was <1.5% on average. Digital mammography and reconstructed digital breast tomosynthesis images of the authors' phantom were reviewed by two radiologists; they reported that the images are similar in appearance to clinical images, noting there are still artifacts from air bubbles in the EBR. Conclusions: The authors have developed a technique to produce 3D anthropomorphic breast phantoms with known ground truth, yielding highly realistic x-ray images. Such phantoms may serve both qualitative and quantitative performance assessments for 2D and 3D breast x-ray imaging systems.

  11. Provox voice prosthesis — The Indian experience

    OpenAIRE

    Nayak, Umanath K.

    2001-01-01

    Following Total Laryngectomy, Tracheo-oesophageal speech prosthesis offers the most reliable form of voice rehabilitation. Of the various prostheses currently available. The Provox voice prosthesis developed by the Netherlands Cancer Institute has been the most popular due to its superior design and in-dwelling nature.

  12. The design of a reflectionless arterial prosthesis

    OpenAIRE

    Kol, Guy Richard; Woafo, Paul

    2010-01-01

    We propose a new technique to characterize a reflectionless arterial prosthesis. The corresponding transmission and reflection coefficients are determined from the geometric and the elastic properties of the arterial wall, and the interaction between the latter and the prosthesis are studied accordingly.

  13. Brucella endocarditis on double valvular prosthesis.

    OpenAIRE

    Lezaun, R; Teruel, J.; Maître, M. J.; De Artaza, M

    1980-01-01

    The case is reported of a 48-year-old man suffering from Brucella endocarditis on a double prosthesis. The successful medical and surgical treatment is described. So far as the authors know, this is the first report of Brucella endocarditis from a heart valve prosthesis.

  14. A Robotic Model of Transfemoral Amputee Locomotion for Design Optimization of Knee Controllers

    Directory of Open Access Journals (Sweden)

    Mohsen Akbari Shandiz

    2013-03-01

    Full Text Available A two‐dimensional, seven link, nine degrees of freedom biped model was developed to investigate the dynamic characteristics of normal and transfemoral amputee locomotion during the entire gait cycle. The equations of motion were derived using the Lagrange method and the stance foot‐ground contact was simulated using a five‐point penetration model. The joint driving torques were obtained using forward dynamic optimization of the normal human gait and applied to the intact joints of the amputee. Three types of motion controllers; frictional, elastic and hydraulic were considered for the prosthetic joints of the amputee and their design parameters were optimized to achieve the closest kinematics to that of the normal gait. It was found that, if optimally designed, all three passive controllers could reasonably reproduce a normal kinematical pattern in the swing phase. However, the stance phase kinematics could only be replicated by the hydraulic and elastic controllers; the performance of the latter was highly sensitive to the design parameters. It was concluded that an appropriately designed hydraulic motion controller can provide reasonably normal kinematics and reliable stability for stance knee flexion prostheses.

  15. Long-term activity in and among persons with transfemoral amputation

    Directory of Open Access Journals (Sweden)

    Elizabeth G. Halsne, CPO

    2013-07-01

    Full Text Available Although physical limitations associated with transfemoral amputation (TFA have been studied in laboratory settings, little is known about habitual activity within free-living environments. A retrospective analysis of 12 mo of step activity data was performed to quantify activity levels, variations, and patterns in 17 adults with unilateral TFA. Yearly, seasonal, and monthly average daily step counts and coefficients of variation (CoVs were examined to characterize mobility. Analysis by Medicare Functional Classification Level (MFCL was performed to explore relationships between clinical classification and performance. Subjects averaged 1,540 prosthetic steps/day, and activity generally increased with MFCL. Activity between MFCL-2 and -3 subjects was not significantly different, suggesting that ability to engage in habitual physical activity may be similar for these groups. Relative variation (CoV was 0.65 across subjects but was lower for those with higher activity levels. No significant differences in CoV by group were detected. Marked seasonal and monthly patterns in activity were identified. Warmer seasons and months generally promoted higher activity, but peak temperatures and humidity depressed activity. Results suggest that persons with TFA are greatly limited in regards to activity. Further, large variations within and between subjects may challenge the interpretation of step activity gathered over short periods of time.

  16. ORIGINAL ARTICLES COMPARISON OF TRANSRADIAL APPROACH AND TRANSFEMORAL APPROACH FOR PERCUTANEOUS CORONARY INTERVENTION

    Institute of Scientific and Technical Information of China (English)

    孙玲; LIMBRUNO; Ugo

    2003-01-01

    Objective Transradial approach (TRA) has currently been advocated as an alternative cathetering method for percutaneous coronary intervention (PCI). The purpose of this study is to compare the feasibility, safety, and efficacy of TRA intervention in Europe and transfemoral approach (TFA) intervention in China.Methods 400 consecutive patients underwent angiography (CAG) and/or PCI performed by TRA as a first option at Cardiothoracic Department in Pisa, I-taly (Group A). Group A also included 63 patients in which TFA or transradial approach was performed due to the failure of TRA( 15%). Group B consisted of 400 patients subjected to CAG or PCI through TFA in a northern city in China. Coronary, intravascular ultrasound, pressure wire, cutting balloon and brachytherapy techniques were used only in Group A.Results The incidence of PCI was higher in Group A than in group B (P<0.01). The positive rate of angiography was higher in group A (P<0.01), where more severe lesions were found and more complicated proced

  17. 21 CFR 878.3800 - External aesthetic restoration prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false External aesthetic restoration prosthesis. 878... External aesthetic restoration prosthesis. (a) Identification. An external aesthetic restoration prosthesis... external prosthesis adhesive. The device is not intended to be implanted. (b) Classification. Class...

  18. Optimized generation of high resolution breast anthropomorphic software phantoms

    International Nuclear Information System (INIS)

    Purpose: The authors present an efficient method for generating anthropomorphic software breast phantoms with high spatial resolution. Employing the same region growing principles as in their previous algorithm for breast anatomy simulation, the present method has been optimized for computational complexity to allow for fast generation of the large number of phantoms required in virtual clinical trials of breast imaging. Methods: The new breast anatomy simulation method performs a direct calculation of the Cooper's ligaments (i.e., the borders between simulated adipose compartments). The calculation corresponds to quadratic decision boundaries of a maximum a posteriori classifier. The method is multiscale due to the use of octree-based recursive partitioning of the phantom volume. The method also provides user-control of the thickness of the simulated Cooper's ligaments and skin. Results: Using the proposed method, the authors have generated phantoms with voxel size in the range of (25-1000 μm)3/voxel. The power regression of the simulation time as a function of the reciprocal voxel size yielded a log-log slope of 1.95 (compared to a slope of 4.53 of our previous region growing algorithm). Conclusions: A new algorithm for computer simulation of breast anatomy has been proposed that allows for fast generation of high resolution anthropomorphic software phantoms.

  19. Leap Motion Device Used to Control a Real Anthropomorphic Gripper

    Directory of Open Access Journals (Sweden)

    Ionel Staretu

    2016-06-01

    Full Text Available This paper presents for the first time the use of the Leap Motion device to control an anthropomorphic gripper with five fingers. First, a description of the Leap Motion device is presented, highlighting its main functional characteristics, followed by testing of its use for capturing the movements of a human hand’s fingers in different configurations. Next, the HandCommander soft module and the Interface Controller application are described. The HandCommander is a software module created to facilitate interaction between a human hand and the GraspIT virtual environment, and the Interface Controller application is required to send motion data to the virtual environment and to test the communication protocol. For the test, a prototype of an anthropomorphic gripper with five fingers was made, including a proper hardware system of command and control, which is briefly presented in this paper. Following the creation of the prototype, the command system performance test was conducted under real conditions, evaluating the recognition efficiency of the objects to be gripped and the efficiency of the command and control strategies for the gripping process. The gripping test is exemplified by the gripping of an object, such as a screw spanner. It was found that the command system, both in terms of capturing human hand gestures with the Leap Motion device and effective object gripping, is operational. Suggestive figures are presented as examples.

  20. Anthropomorphic Design of the Human-Like Walking Robot

    Institute of Scientific and Technical Information of China (English)

    Ming-Hsun Chiang; Fan-Ren Chang

    2013-01-01

    In this paper,we present a new concept of the mechanical design of a humanoid robot.The goal is to build a humanoid robot utilizing a new structure which is more suitable for human-like walking with the characteristics of the knee stretch,heel-contact,and toe-off.Inspired by human skeleton,we made an anthropomorphic pelvis for the humanoid robot.In comparison with conventional humanoid robots,with such the anthropomorphic pelvis,our robot is capable of adjusting the center of gravity of the upper body by the motion of pelvic tilt,thus reducing the required torque at the ankle joint and the velocity variations in human-like walking.With more precise analysis of the foot mechanism,the fixed-length inverted pendulum can be used to describe the dynamics of biped walking,thus preventing redundant works and power consumption in length variable inverted pendulum system.As the result of the new structure we propose,a humanoid robot is able to walk with human-like gait.

  1. OSL Based Anthropomorphic Phantom and Real-Time Organ Dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    David E. Hintenlang, Ph.D

    2009-02-10

    The overall objective of this project was the development of a dosimetry system that provides the direct measurement of organ does in real-time with a sensitivity that makes it an effective tool for applications in a wide variety of health physics applications. The system included the development of a real-time readout system for fiber optic coupled (FOC) dosimeters that is integrated with a state-of-art anthropomorphic phantom to provide instantaneous measures of organ doses throughout the phantom. The small size of the FOC detectors and optical fibers allow the sensitive volume of the detector to be located at organ centroids (or multiple locations distributed through the organ) within a tissue equivalent, anthropomorphic phantom without perturbing the tissue equivalent features of the phantom. The developed phantom/dosimetry system can be used in any environment where personnel may be exposed to gamma or x-ray radiations to provide the most accurate determinations of organ and effective doses possible to date.

  2. Synthesized interstitial lung texture for use in anthropomorphic computational phantoms

    Science.gov (United States)

    Becchetti, Marc F.; Solomon, Justin B.; Segars, W. Paul; Samei, Ehsan

    2016-04-01

    A realistic model of the anatomical texture from the pulmonary interstitium was developed with the goal of extending the capability of anthropomorphic computational phantoms (e.g., XCAT, Duke University), allowing for more accurate image quality assessment. Contrast-enhanced, high dose, thorax images for a healthy patient from a clinical CT system (Discovery CT750HD, GE healthcare) with thin (0.625 mm) slices and filtered back- projection (FBP) were used to inform the model. The interstitium which gives rise to the texture was defined using 24 volumes of interest (VOIs). These VOIs were selected manually to avoid vasculature, bronchi, and bronchioles. A small scale Hessian-based line filter was applied to minimize the amount of partial-volumed supernumerary vessels and bronchioles within the VOIs. The texture in the VOIs was characterized using 8 Haralick and 13 gray-level run length features. A clustered lumpy background (CLB) model with added noise and blurring to match CT system was optimized to resemble the texture in the VOIs using a genetic algorithm with the Mahalanobis distance as a similarity metric between the texture features. The most similar CLB model was then used to generate the interstitial texture to fill the lung. The optimization improved the similarity by 45%. This will substantially enhance the capabilities of anthropomorphic computational phantoms, allowing for more realistic CT simulations.

  3. Characterization of a novel anthropomorphic plastinated lung phantom.

    Science.gov (United States)

    Yoon, Sungwon; Henry, Robert W; Bouley, Donna M; Bennett, N Robert; Fahrig, Rebecca

    2008-12-01

    Phantoms are widely used during the development of new imaging systems and algorithms. For development and optimization of new imaging systems such as tomosynthesis, where conventional image quality metrics may not be applicable, a realistic phantom that can be used across imaging systems is desirable. A novel anthropomorphic lung phantom was developed by plastination of an actual pig lung. The plastinated phantom is characterized and compared with reference to in vivo images of the same tissue prior to plastination using high resolution 3D CT. The phantom is stable over time and preserves the anatomical features and relative locations of the in vivo sample. The volumes for different tissue types in the phantom are comparable to the in vivo counterparts, and CT numbers for different tissue types fall within a clinically useful range. Based on the measured CT numbers, the phantom cardiac tissue experienced a 92% decrease in bulk density and the phantom pulmonary tissue experienced a 78% decrease in bulk density compared to their in vivo counterparts. By-products in the phantom from the room temperature vulcanizing silicone and plastination process are also identified. A second generation phantom, which eliminates most of the by-products, is presented. Such anthropomorphic phantoms can be used to evaluate a wide range of novel imaging systems. PMID:19175148

  4. Anthropomorphic Bias Found in Typically Developing Children Is Not Found in Children with Autistic Spectrum Disorder

    Science.gov (United States)

    Chaminade, Thierry; Rosset, Delphine; Da Fonseca, David; Hodgins, Jessica K.; Deruelle, Christine

    2015-01-01

    The anthropomorphic bias describes the finding that the perceived naturalness of a biological motion decreases as the human-likeness of a computer-animated agent increases. To investigate the anthropomorphic bias in autistic children, human or cartoon characters were presented with biological and artificial motions side by side on a touchscreen.…

  5. Anthropomorphizing Science: How Does It Affect the Development of Evolutionary Concepts?

    Science.gov (United States)

    Legare, Cristine H.; Lane, Jonathan D.; Evans, E. Margaret

    2013-01-01

    Despite the ubiquitous use of anthropomorphic language to describe biological change in both educational settings and popular science, little is known about how anthropomorphic language influences children's understanding of evolutionary concepts. In an experimental study, we assessed whether the language used to convey evolutionary concepts…

  6. Lifting the Taboo Regarding Teleology and Anthropomorphism in Biology Education--Heretical Suggestions.

    Science.gov (United States)

    Zohar, Anat; Ginossar, Shlomit

    1998-01-01

    Advocates removing the taboo regarding anthropomorphism and teleology in biology education. Argues that for high school students, accepting such formulations does not necessarily imply anthropomorphic or teleological reasoning. Further, living organisms seem goal-oriented because of their adaptation for survival. Concludes with the argument that…

  7. Patients with hip prosthesis: radiotherapy treatment planning considerations

    International Nuclear Information System (INIS)

    The number of patients with hip prosthesis undergoing radiotherapy for pelvic cancer worldwide is increasing. This might be of importance depending on the materials in the prosthesis and whether any of the treatment fields are involved in the prosthesis. Radiotherapy planning involving the pelvic region of patients having total hip prosthesis has been found to be difficult due to the effect of the prosthesis on the dose distribution. This review is intended to project dosimetric considerations and possible solutions to this uncommon problem

  8. A universal ankle-foot prosthesis emulator for human locomotion experiments.

    Science.gov (United States)

    Caputo, Joshua M; Collins, Steven H

    2014-03-01

    Robotic prostheses have the potential to significantly improve mobility for people with lower-limb amputation. Humans exhibit complex responses to mechanical interactions with these devices, however, and computational models are not yet able to predict such responses meaningfully. Experiments therefore play a critical role in development, but have been limited by the use of product-like prototypes, each requiring years of development and specialized for a narrow range of functions. Here we describe a robotic ankle-foot prosthesis system that enables rapid exploration of a wide range of dynamical behaviors in experiments with human subjects. This emulator comprises powerful off-board motor and control hardware, a flexible Bowden cable tether, and a lightweight instrumented prosthesis, resulting in a combination of low mass worn by the human (0.96 kg) and high mechatronic performance compared to prior platforms. Benchtop tests demonstrated closed-loop torque bandwidth of 17 Hz, peak torque of 175 Nm, and peak power of 1.0 kW. Tests with an anthropomorphic pendulum "leg" demonstrated low interference from the tether, less than 1 Nm about the hip. This combination of low worn mass, high bandwidth, high torque, and unrestricted movement makes the platform exceptionally versatile. To demonstrate suitability for human experiments, we performed preliminary tests in which a subject with unilateral transtibial amputation walked on a treadmill at 1.25 ms-1 while the prosthesis behaved in various ways. These tests revealed low torque tracking error (RMS error of 2.8 Nm) and the capacity to systematically vary work production or absorption across a broad range (from -5 to 21 J per step). These results support the use of robotic emulators during early stage assessment of proposed device functionalities and for scientific study of fundamental aspects of human-robot interaction. The design of simple, alternate end-effectors would enable studies at other joints or with

  9. Stemless shoulder prosthesis versus conventional anatomic shoulder prosthesis in patients with osteoarthritis

    OpenAIRE

    Berth, Alexander; Pap, Géza

    2012-01-01

    Background The stemless shoulder prosthesis is a new concept in shoulder arthroplasty. To date, only a few studies have investigated the results of this prosthesis. The aim of this study was to investigate the clinical and radiological midterm results of this implant in comparison with a standard anatomic stemmed shoulder prosthesis. Materials and methods The Constant score, the DASH score, the active range of motion (abduction, anteversion, external rotation), and the radiological results we...

  10. Functional Impression Technique for an Ocular Prosthesis

    OpenAIRE

    Jethwani, Jitendra; Jethwani, Gayathri S.; Verma, A. K.

    2011-01-01

    The loss of an eye is the most devastating, psychologically damaging experience for a patient. All hope to bring such patients back to their accustomed and comfortable life-style rests on a cosmetically acceptable prosthesis. An intra-orbital ocular prosthesis serves the purpose in those defects where the orbital margins are intact. Though the stock eye may match the natural eye’s iris and sclera in color, the fit of the prosthesis to the tissue bed may not be as good as desired. Herein, a fu...

  11. Study on a 7-DOF anthropomorphic weld arm

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    A kind of new obstacle space expression is proposed in this paper, in which a virtual force field (VFF) is built. Using the torque and joint optimization acted by the virtual force field on the anthropomorphic weld arm, the real-time selection of a redundant join (R-joint) is done and its equivalent virtual torque is obtained, thus the redundant joint can be controlled with whose force feedback. An inverse kinematics solution of a 6-DOF robot is applied to other six joints of the arm. Simulation experiments indicate the new inverse kinematics solution has perfect collision avoidance effect, and it is well simplified. Therefore, it can be applied to a welding task in complex operation space.

  12. Percutaneous transfemoral-transseptal implantation of a second-generation CardiAQ™ mitral valve bioprosthesis

    DEFF Research Database (Denmark)

    Ussia, Gian Paolo; Quadri, Arshad; Cammalleri, Valeria;

    2016-01-01

    bioprosthesis and 30-day follow-up. METHODS AND RESULTS: The procedure was performed percutaneously, without any left extracorporeal circulatory support. The patient had severe mitral regurgitation with severely depressed ventricular function and other comorbidities. The patient was deemed extreme high risk...... echocardiography and fluoroscopy were utilised for device positioning and deployment. The mitral valve prosthesis was implanted with mild mitral regurgitation. The postoperative course was uneventful and at 30-day follow-up the patient is in NYHA Class I, with good function of the mitral valve bioprosthesis...

  13. Penile prosthesis implantation in a transsexual neophallus

    Institute of Scientific and Technical Information of China (English)

    Hui-MengTAN

    2000-01-01

    Reconstruction surgery for a female to male transsexual usually involves mastectomy, hysterectomy and creating an aesthetically appealing neophallus. We have successfully inserted an inflatable prosthesis using the AMS CX prosthesis in a 45 year old transsexual, who had a large bulky neophallus constructed from the anterior abdominal subcutaneous fat, about 9 years ago. The single cylinder CX prosthesis was well anchored to the symphysis pubis using a dacron windsock tubing, the activation pump was placed in the dependent pouch of the right labium and the reservior in the usual perivesical space. The patient subsequently had debulking procedure using liposuction to create a more aesthetic and functional phallus. To date, the inflatable neophallus prosthesis is functioning well. (Asian J Androl 2000 Dec;2:304-306)

  14. Development of Receiver Stimulator for Auditory Prosthesis

    OpenAIRE

    K. Raja Kumar; P. Seetha Ramaiah

    2010-01-01

    The Auditory Prosthesis (AP) is an electronic device that can provide hearing sensations to people who are profoundly deaf by stimulating the auditory nerve via an array of electrodes with an electric current allowing them to understand the speech. The AP system consists of two hardware functional units such as Body Worn Speech Processor (BWSP) and Receiver Stimulator. The prototype model of Receiver Stimulator for Auditory Prosthesis (RSAP) consists of Speech Data Decoder, DAC, ADC, constant...

  15. Fracture embolization of a Duromedics mitral prosthesis.

    OpenAIRE

    Baumgartner, F J; Munro, A I; Jamieson, W R

    1997-01-01

    The Duromedics bileaflet pyrolitic carbon mechanical prosthesis was introduced by Hemex in 1982 and subsequently acquired by Baxter. This communication documents a case of sudden leaflet fracture of a Duromedics mitral valve 48 months after implantation, which was managed successfully by replacement with a St. Jude Medical mechanical prosthesis. The patient presented in acute distress with paroxysmal atrial tachycardia and pulmonary edema. Transesophageal echocardiography was used to diagnose...

  16. The Effectiveness of Inpatient Rehabilitation in the Acute Postoperative Phase of Care After Transtibial or Transfemoral Amputation: Study of an Integrated Health Care Delivery System

    OpenAIRE

    Stineman, Margaret G.; Kwong, Pui L.; Kurichi, Jibby E.; Prvu-Bettger, Janet A.; Vogel, W Bruce; Maislin, Greg; Bates, Barbara E.; Reker, Dean M.

    2008-01-01

    Stineman MG, Kwong PL, Kurichi JE, Prvu-Bettger JA, Vogel WB, Maislin G, Bates BE, Reker DM. The effectiveness of inpatient rehabilitation in the acute postoperative phase of care after transtibial or transfemoral amputation: study of an integrated health care delivery system. Arch Phys Med Rehabil 2008;89:1863-72.

  17. Comparison of the patient radiation exposure during coronary angiography and angioplasty procedures using trans-radial and trans-femoral access

    Directory of Open Access Journals (Sweden)

    Ali Tarighatnia

    2016-06-01

    Conclusion: On the basis of the results obtained in this study, no differences were found in patients’ radiation dose in both access groups, therefore with regard to comparatively more clinical advantages associated with the Trans-radial access technique it might be a good substitute for Trans-femoral access.

  18. CT images of an anthropomorphic and anthropometric male pelvis phantom

    International Nuclear Information System (INIS)

    Actually, among of the most often neoplasm types are the cancer of prostate, bladder and intestine. The incidence of the intestine neoplasm in Brazil is at fourth among the most frequent tumors of the male sex, barely close to the stomach, lung and prostate incidences. Phantoms are objects used as simulators for investigating ionizing radiation transport on humans, especially during radiation therapy or radiological diagnostic. The purpose of this work is the achievement of a set of computerized tomography (CT) images of a male pelvis phantom, with anthropomorphic and anthropometric features. It investigates and analyses the set of phantom CT images in according to a correspondent human pelvis one. The reason to develop a pelvis phantom is the needs of reproducing well established spatial dose distribution in radiation therapy, especially during calibration and protocol setup for various pelvis neoplasms. It aims to produce dose optimization on radiation therapy, improving health tissue protection and keeping control tumor dose. A male pelvis phantom with similar shape made of equivalent tissues was built for simulating the ionizing radiation transport to the human body. At the phantom, pelvis organs were reproduced including the bladder, the intestine, the prostate, the muscular and greasy tissue, as well as the bone tissue and the skin. A set of CT images was carried out in axial thin sections of 2mm thickness. As results, the constituent tissues had a tomography response on Hounsfield scale similar to values found on the human pelvis. Each tissue has its respective Hounsfield value, demonstrated here. The CT images also show that the organs have equivalent anthropometric measures and anthropomorphic features of the radiological human anatomy. The anatomical physical arrangement of the organs is also similar to of the pelvis human male, having the scales of gray and numerical scale of Hounsfield compatible with the scale of the human tissue. The phantom presents

  19. CT images of an anthropomorphic and anthropometric male pelvis phantom

    Energy Technology Data Exchange (ETDEWEB)

    Matos, Andrea S.D. de; Campos, Tarcisio P.R. de, E-mail: campos@nuclear.ufmg.b [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Programa de Pos-graduacao em Ciencias e Tecnicas Nucleares

    2009-07-01

    Actually, among of the most often neoplasm types are the cancer of prostate, bladder and intestine. The incidence of the intestine neoplasm in Brazil is at fourth among the most frequent tumors of the male sex, barely close to the stomach, lung and prostate incidences. Phantoms are objects used as simulators for investigating ionizing radiation transport on humans, especially during radiation therapy or radiological diagnostic. The purpose of this work is the achievement of a set of computerized tomography (CT) images of a male pelvis phantom, with anthropomorphic and anthropometric features. It investigates and analyses the set of phantom CT images in according to a correspondent human pelvis one. The reason to develop a pelvis phantom is the needs of reproducing well established spatial dose distribution in radiation therapy, especially during calibration and protocol setup for various pelvis neoplasms. It aims to produce dose optimization on radiation therapy, improving health tissue protection and keeping control tumor dose. A male pelvis phantom with similar shape made of equivalent tissues was built for simulating the ionizing radiation transport to the human body. At the phantom, pelvis organs were reproduced including the bladder, the intestine, the prostate, the muscular and greasy tissue, as well as the bone tissue and the skin. A set of CT images was carried out in axial thin sections of 2mm thickness. As results, the constituent tissues had a tomography response on Hounsfield scale similar to values found on the human pelvis. Each tissue has its respective Hounsfield value, demonstrated here. The CT images also show that the organs have equivalent anthropometric measures and anthropomorphic features of the radiological human anatomy. The anatomical physical arrangement of the organs is also similar to of the pelvis human male, having the scales of gray and numerical scale of Hounsfield compatible with the scale of the human tissue. The phantom presents

  20. Who Sees Human? The Stability and Importance of Individual Differences in Anthropomorphism.

    Science.gov (United States)

    Waytz, Adam; Cacioppo, John; Epley, Nicholas

    2010-05-01

    Anthropomorphism is a far-reaching phenomenon that incorporates ideas from social psychology, cognitive psychology, developmental psychology, and the neurosciences. Although commonly considered to be a relatively universal phenomenon with only limited importance in modern industrialized societies-more cute than critical-our research suggests precisely the opposite. In particular, we provide a measure of stable individual differences in anthropomorphism that predicts three important consequences for everyday life. This research demonstrates that individual differences in anthropomorphism predict the degree of moral care and concern afforded to an agent, the amount of responsibility and trust placed on an agent, and the extent to which an agent serves as a source of social influence on the self. These consequences have implications for disciplines outside of psychology including human-computer interaction, business (marketing and finance), and law. Concluding discussion addresses how understanding anthropomorphism not only informs the burgeoning study of nonpersons, but how it informs classic issues underlying person perception as well. PMID:24839457

  1. DESIGN OF AN ANTHROPOMORPHIC UPPER LIMB EXOSKELETON ACTUATED BY BALL-SCREWS AND CABLES

    OpenAIRE

    Garrec, Philippe

    2010-01-01

    This paper presents the design of ABLE, an anthropomorphic upper limb exoskeleton integrally actuated by highly reversible ball-screw and cable (SCS standing for Screw-and-Cable-System) allowing true joint torque control without force sensor. Their unique kinematics allows their integration in the structure thanks to dedicated mechanical innovations such as the shoulder articulation and the forearm-wrist. The result is an anthropomorphic, lightweight, open architecture which avoids imprisonin...

  2. Anthropomorphism and Human Likeness in the Design of Robots and Human-Robot Interaction

    OpenAIRE

    Ge, Shuzi Sam; Khatib, Oussama; Cabibihan, John-John; Simmons, Reid; Williams, Mary-Anne; Fink, Julia

    2012-01-01

    In this literature review we explain anthropomorphism and its role in the design of socially interactive robots and human-robot interaction. We illus-trate the social phenomenon of anthropomorphism which describes people’s tendency to attribute lifelike qualities to objects and other non lifelike artifacts. We present theoretical backgrounds from social sciences, and integrate related work from robotics research, including results from experiments with social ro-bots. We present different app...

  3. Who Sees Human? The Stability and Importance of Individual Differences in Anthropomorphism

    OpenAIRE

    Waytz, Adam; Cacioppo, John; Epley, Nicholas

    2014-01-01

    Anthropomorphism is a far-reaching phenomenon that incorporates ideas from social psychology, cognitive psychology, developmental psychology, and the neurosciences. Although commonly considered to be a relatively universal phenomenon with only limited importance in modern industrialized societies—more cute than critical—our research suggests precisely the opposite. In particular, we provide a measure of stable individual differences in anthropomorphism that predicts three important consequenc...

  4. Body image and prosthesis satisfaction in the lower limb amputee.

    OpenAIRE

    Murray, Craig; Fox, Jezz

    2002-01-01

    Purpose: This study examines the relationship between prosthesis satisfaction and body image in lower limb prosthesis users, and the gendered variations within these relationships. Method: A total of 44 valid responses were obtained to an Internet survey regarding prosthesis satisfaction, body image, and phantom pain. Spearman Rho correlations were calculated for these three domains. Results: Moderate to high negative correlations were observed between Body Image Disturbance and Prosthesis Sa...

  5. Experimental Recognition of Loading Character of Transtibial Prosthesis

    OpenAIRE

    Paloušek, David; Návrat, Tomáš; Rosický, Jiří; Krejčí, Petr; Houfek, Martin

    2008-01-01

    This paper deals with experimental simulation of mechanical properties of transtibial prosthesis. Artificial limb allows patient standing and moving without of using others supporting devices. Therefore, patient returns back to common and active life. Design and prosthesis properties decide about comfort, safeness and reliability of prosthesis. The article summarizes a conclusion of preliminary experiment, which was performed to measurement procedure of prosthesis strain (for real loading of ...

  6. Implant-Retained Auricular Prosthesis: A Case Report

    OpenAIRE

    Ozturk, A. Nilgun; Usumez, Aslihan; Tosun, Zekeriya

    2010-01-01

    Extraoral implant retained prosthesis have been proven to be a predictable treatment option for maxillofacial rehabilitation. This case report describes the clinical and laboratory procedures for fabricating an auricular prosthesis. In this case report, an auricular prosthesis was fabricated for a patient who lost the left and right external ear in an electrical burn. Extraoral implants and bar-and-clip retention for the proper connection of the auricular prosthesis to implant were used. This...

  7. Life Estimation of Hip Joint Prosthesis

    Science.gov (United States)

    Desai, C.; Hirani, H.; Chawla, A.

    2014-11-01

    Hip joint is one of the largest weight-bearing structures in the human body. In the event of a failure of the natural hip joint, it is replaced with an artificial hip joint, known as hip joint prosthesis. The design of hip joint prosthesis must be such so as to resist fatigue failure of hip joint stem as well as bone cement, and minimize wear caused by sliding present between its head and socket. In the present paper an attempt is made to consider both fatigue and wear effects simultaneously in estimating functional-life of the hip joint prosthesis. The finite element modeling of hip joint prosthesis using HyperMesh™ (version 9) has been reported. The static analysis (load due to the dead weight of the body) and dynamic analysis (load due to walking cycle) have been described. Fatigue life is estimated by using the S-N curve of individual materials. To account for progressive wear of hip joint prosthesis, Archard's wear law, modifications in socket geometry and dynamic analysis have been used in a sequential manner. Using such sequential programming reduction in peak stress has been observed with increase in wear. Finally life is estimated on the basis of socket wear.

  8. Conventional X-ray after shoulder prosthesis

    International Nuclear Information System (INIS)

    Three types of shoulder prostheses are commonly used to cover the different indications of shoulder joint replacements: classical modular, inverse and cup. The modular prosthesis can replace the glenoid as well as the humeral head components. Exact visualization of the interface between the glenoid component and bone (or cement-bone interface) is necessary to detect osteolysis, which is relatively common. Therefore, it is mandatory to make true AP and axial projections. When describing the humeral component, the interface between bone and implant must again be considered. Additionally, the position of the humeral head in relation to the glenoid has to be noted. The glenoid component is usually fixed by screws to the bone and an osteolysis is often present at the inferior pole of the glenoid component due to prosthesis bone notching. If the implants are modular devices (classic modular prosthesis, inverse shoulder prosthesis) there is the possibility of dissociation of components and any suspicion of this should be reported. In case of reporting the conventional x-ray of cup prosthesis, the bone implant interface should be mentioned. Again the position of the humeral head to the glenoid requires attention. In all types of prostheses, dislocation of the glenohumeral joint is obvious and has to be addressed in the medical report. (orig.)

  9. Anthropomorphic robot for recognition and drawing generalized object images

    Science.gov (United States)

    Ginzburg, Vera M.

    1998-10-01

    The process of recognition, for instance, understanding the text, written by different fonts, consists in the depriving of the individual attributes of the letters in the particular font. It is shown that such process, in Nature and technique, can be provided by the narrowing the spatial frequency of the object's image by its defocusing. In defocusing images remain only areas, so-called Informative Fragments (IFs), which all together form the generalized (stylized) image of many identical objects. It is shown that the variety of shapes of IFs is restricted and can be presented by `Geometrical alphabet'. The `letters' for this alphabet can be created using two basic `genetic' figures: a stripe and round spot. It is known from physiology that the special cells of visual cortex response to these particular figures. The prototype of such `genetic' alphabet has been made using Boolean algebra (Venn's diagrams). The algorithm for drawing the letter's (`genlet's') shape in this alphabet and generalized images of objects (for example, `sleeping cat'), are given. A scheme of an anthropomorphic robot is shown together with results of model computer experiment of the robot's action--`drawing' the generalized image.

  10. Enhancement of finger motion range with compliant anthropomorphic joint design.

    Science.gov (United States)

    Çulha, Utku; Iida, Fumiya

    2016-04-01

    Robotic researchers have been greatly inspired by the human hand in the search to design and build adaptive robotic hands. Especially, joints have received a lot of attention upon their role in maintaining the passive compliance that gives the fingers flexibility and extendible motion ranges. Passive compliance, which is the tendency to be employed in motion under the influence of an external force, is the result of the stiffness and the geometrical constraints of the joints that define the direction of the motion. Based on its building elements, human finger joints have multi-directional passive compliance which means that they can move in multiple axis of motion under external force. However, due to their complex anatomy, only simplified biomechanical designs based on physiological analysis are preferred in present day robotics. To imitate the human joints, these designs either use fixed degree of freedom mechanisms which substantially limit the motion axes of compliance, or soft materials that can deform in many directions but hinder the fingers' force exertion capacities. In order to find a solution that lies between these two design approaches, we are using anatomically correct finger bones, elastic ligaments and antagonistic tendons to build anthropomorphic joints with multi-directional passive compliance and strong force exertion capabilities. We use interactions between an index finger and a thumb to show that our joints allow the extension of the range of motion of the fingers up to 245% and gripping size to 63% which can be beneficial for mechanical adaptation in gripping larger objects. PMID:26891473

  11. Credentialing for advanced technology clinical trials using anthropomorphic phantoms

    International Nuclear Information System (INIS)

    Full text: The Radiological Physics Center (RPC) was established as a resource in radiation dosimetry and physics for cooperative clinical trial groups and radiotherapy facilities that deliver radiation treatments to patients entered onto cooperative group protocols. The RPC's primary responsibility is to assure NCI and the cooperative groups that the participating institutions have adequate quality assurance procedures and no major systematic dosimetry discrepancies, so that radiation treatments that are delivered are clinically comparable to those delivered by other institutions in the cooperative groups. To accomplish this, the RPC monitors the basic machine output and brachytherapy source strengths, the dosimetry data utilized by the institutions, calculational algorithms used for treatment planning, and the institutions' quality control procedures. The methods of monitoring include on-site dosimetry review by an RPC physicist, and several remote audit tools. The remote audit tools include 1) mailed dosimeters (TLD) evaluated on a periodic basis to verify output calibration and questionnaires regarding changes in personnel, equipment, and dosimetry practices; 2) comparison of dosimetry data with RPC 'standard data' to verify the compatibility of dosimetry data; 3) evaluation of reference and actual patient calculations to verify the validity of treatment planning algorithms; 4) review of the institutions' quality assurance procedures and records; and 5) mailable anthropomorphic phantoms to verify tumour dose delivery for special treatment techniques. The RPC has developed an extensive credentialing programme for institutions wishing to participate in clinical trials that use advanced technologies such as stereotactic radiosurgery (SRS) and intensity-modulated radiation therapy (IMRT). This programme requires institutions to submit questionnaires designed to test the participants' knowledge of the specific clinical trial, and to describe the institution

  12. Vertical Drop Testing and Simulation of Anthropomorphic Test Devices

    Science.gov (United States)

    Polanco, Michael A.; Littell, Justin D.

    2011-01-01

    A series of 14 vertical impact tests were conducted using Hybrid III 50th Percentile and Hybrid II 50th Percentile Anthropomorphic Test Devices (ATDs) at NASA Langley Research Center. The purpose of conducting these tests was threefold: to compare and contrast the impact responses of Hybrid II and Hybrid III ATDs under two different loading conditions, to compare the impact responses of the Hybrid III configured with a nominal curved lumbar spine to that of a Hybrid III configured with a straight lumbar spine, and to generate data for comparison with predicted responses from two commercially available ATD finite element models. The two loading conditions examined were a high magnitude, short duration acceleration pulse, and a low magnitude, long duration acceleration pulse, each created by using different paper honeycomb blocks as pulse shape generators in the drop tower. The test results show that the Hybrid III results differ from the Hybrid II results more for the high magnitude, short duration pulse case. The comparison of the lumbar loads for each ATD configuration show drastic differences in the loads seen in the spine. The analytical results show major differences between the responses of the two finite element models. A detailed discussion of possible sources of the discrepancies between the two analytical models is also provided.

  13. 21 CFR 874.3695 - Mandibular implant facial prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Mandibular implant facial prosthesis. 874.3695... facial prosthesis. (a) Identification. A mandibular implant facial prosthesis is a device that is... made of materials such as stainless steel, tantalum, titanium, cobalt-chromium based...

  14. 21 CFR 874.3450 - Partial ossicular replacement prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Partial ossicular replacement prosthesis. 874.3450 Section 874.3450 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES... replacement prosthesis. (a) Identification. A partial ossicular replacement prosthesis is a device intended...

  15. Fabrication of temporary speech bulb prosthesis: A clinical report

    OpenAIRE

    Kasim Mohamed, K.; Anand Kumar, V.; Devi, N; T V Padmanaban

    2010-01-01

    Maxillofacial prosthesis is an art and science which not only replaces the lost structure sometimes it restores the functions also. Pharyngeal obturator is a prosthesis which closes the palatal and pharyngeal defects and improving the speech and other function. The following case report discusses palatopharyngeal insufficiency, impression procedures, fabrication of prosthesis and improvements in speech.

  16. 21 CFR 888.3230 - Finger joint polymer constrained prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Finger joint polymer constrained prosthesis. 888... constrained prosthesis. (a) Identification. A finger joint polymer constrained prosthesis is a device intended... generic type of device includes prostheses that consist of a single flexible across-the-joint...

  17. 21 CFR 884.3650 - Fallopian tube prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Fallopian tube prosthesis. 884.3650 Section 884.3650 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED... § 884.3650 Fallopian tube prosthesis. (a) Identification. A fallopian tube prosthesis is a...

  18. 21 CFR 872.3950 - Glenoid fossa prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Glenoid fossa prosthesis. 872.3950 Section 872...) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3950 Glenoid fossa prosthesis. (a) Identification. A glenoid fossa prosthesis is a device that is intended to be implanted in the...

  19. 21 CFR 890.3500 - External assembled lower limb prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false External assembled lower limb prosthesis. 890.3500... External assembled lower limb prosthesis. (a) Identification. An external assembled lower limb prosthesis... the lower extremity. Examples of external assembled lower limb prostheses are the following:...

  20. 21 CFR 872.3960 - Mandibular condyle prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Mandibular condyle prosthesis. 872.3960 Section... (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3960 Mandibular condyle prosthesis. (a) Identification. A mandibular condyle prosthesis is a device that is intended to be implanted in the human jaw...

  1. Fabrication of a Functional Finger Prosthesis With Simple Attachment

    OpenAIRE

    Pattanaik, Bikash; Pattanaik, Seema

    2012-01-01

    Finger prosthesis is more acceptable by the patient when it allows some of the movement in the prosthesis along with the restoration of a natural appearance to the lost structures of the patient. This article describes a custom-fabricated, custom-colored prostheses made from silicone elastomers with a simple attachment to make the prosthesis functional to imitate some of the movement.

  2. 21 CFR 872.3940 - Total temporomandibular joint prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Total temporomandibular joint prosthesis. 872.3940... prosthesis. (a) Identification. A total temporomandibular joint prosthesis is a device that is intended to be... and Drug Administration on or before March 30, 1999, for any total temporomandibular joint...

  3. 21 CFR 874.3495 - Total ossicular replacement prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Total ossicular replacement prosthesis. 874.3495 Section 874.3495 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES... replacement prosthesis. (a) Identification. A total ossicular replacement prosthesis is a device intended...

  4. 21 CFR 878.3750 - External prosthesis adhesive.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false External prosthesis adhesive. 878.3750 Section 878...) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3750 External prosthesis adhesive. (a) Identification. An external prosthesis adhesive is a silicone-type adhesive intended to...

  5. 21 CFR 888.3720 - Toe joint polymer constrained prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Toe joint polymer constrained prosthesis. 888.3720 Section 888.3720 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES... prosthesis. (a) Identification. A toe joint polymer constrained prosthesis is a device made of...

  6. 21 CFR 870.3450 - Vascular graft prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Vascular graft prosthesis. 870.3450 Section 870... prosthesis. (a) Identification. A vascular graft prosthesis is an implanted device intended to repair... Prostheses 510(k) Submissions.”...

  7. 21 CFR 888.3780 - Wrist joint polymer constrained prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Wrist joint polymer constrained prosthesis. 888.3780 Section 888.3780 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN... constrained prosthesis. (a) Identification. A wrist joint polymer constrained prosthesis is a device made...

  8. 21 CFR 888.3025 - Passive tendon prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Passive tendon prosthesis. 888.3025 Section 888...) MEDICAL DEVICES ORTHOPEDIC DEVICES Prosthetic Devices § 888.3025 Passive tendon prosthesis. (a) Identification. A passive tendon prosthesis is a device intended to be implanted made of silicon elastomer or...

  9. 21 CFR 874.3730 - Laryngeal prosthesis (Taub design).

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Laryngeal prosthesis (Taub design). 874.3730... (CONTINUED) MEDICAL DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3730 Laryngeal prosthesis (Taub design). (a) Identification. A laryngeal prosthesis (Taub design) is a device intended to...

  10. 21 CFR 878.3530 - Silicone inflatable breast prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Silicone inflatable breast prosthesis. 878.3530... (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3530 Silicone inflatable breast prosthesis. (a) Identification. A silicone inflatable breast prosthesis is a...

  11. Simultaneous transfemoral transcatheter mitral and tricuspid valve edge-to-edge repair (using MitraClip system) completed by atrial septal defect occlusion in a surgically inoperable patient. First-in-human report

    OpenAIRE

    Kowalski, Marek; Franz, Norbert; Ritter, Frank; Hofmann, Steffen; Stabel-Mahassine, Chourok; Warnecke, Henning; Thale, Joachim

    2015-01-01

    Transcatheter transfemoral mitral valve repair using the MitraClip system (Abbott Vascular, USA) is used in high-risk or inoperable patients with severe mitral regurgitation. We report the first-in-human simultaneous transfemoral clipping of the mitral and tricuspid valve completed by occlusion of an atrial septal defect (ASD). The procedure was performed in an 84-year-old patient in October 2015. After effective reduction of mitral and tricuspid regurgitations using the MitraClip system a PF...

  12. Production of porous coating on a prosthesis

    Science.gov (United States)

    Sump, Kenneth R.

    1987-01-01

    Preselected surface areas of a prosthesis are covered by a blend of matching primary metallic particles and expendable particles. The particles are compressed and heated to assure that deformation and metallurgical bonding occurs between them and between the primary particles and the surface boundaries of the prosthesis. Porosity is achieved by removal of the expendable material. The result is a coating including discrete bonded particles separated by a network of interconnected voids presenting a homogeneous porous coating about the substrate. It has strength suitable for bone implant usage without intermediate adhesives, and adequate porosity to promote subsequent bone ingrowth.

  13. Fabrication of a custom ocular prosthesis

    Directory of Open Access Journals (Sweden)

    Tania Sethi

    2014-01-01

    Full Text Available Defects of the eye may follow removal of a part of or the entire orbit. This results in the patient becoming visually, esthetically and psychologically handicapped. Restoring the defect with a silicone- or acrylic-based prosthesis not only restores esthetics but also gives back the lost confidence to the patient. This is a case report of a patient with a `pthisical eye` and details the steps in fabrication of an ocular prosthesis. Particular attention has been given to the laboratory process in this technique to minimize the residual monomer content in the artificial eye.

  14. Computational anthropomorphic phantoms for radiation protection dosimetry: evolution and prospects

    International Nuclear Information System (INIS)

    Computational anthropomorphic phantoms are computer models of human anatomy used in the calculation of radiation dose distribution in the human body upon exposure to a radiation source. Depending on the manner to represent human anatomy, they are categorized into two classes: stylized and tomographic phantoms. Stylized phantoms, which have mainly been developed at the Oak Ridge National Laboratory (ORNL), describe human anatomy by using simple mathematical equations of analytical geometry. Several improved stylized phantoms such as male and female adults, pediatric series, and enhanced organ models have been developed following the first hermaphrodite adult stylized phantom, Medical Internal Radiation Dose (MIRD)-5 phantom. Although stylized phantoms have significantly contributed to dosimetry calculation, they provide only approximations of the true anatomical features of the human body and the resulting organ dose distribution. An alternative class of computational phantom, the tomographic phantom, is based upon three-dimensional imaging techniques such as Magnetic Resonance (MR) imaging and Computed Tomography (CT). The tomographic phantoms represent the human anatomy with a large number of voxels that are assigned tissue type and organ identity. To date, a total of around 30 tomographic phantoms including male and female adults, pediatric phantoms, and even a pregnant female, have been developed and utilized for realistic radiation dosimetry calculation. They are based on MRI/CT images or sectional color photos from patients, volunteers or cadavers. Several investigators have compared tomographic phantoms with stylized phantoms, and demonstrated the superiority of tomographic phantoms in terms of realistic anatomy and dosimetry calculation. This paper summarizes the history and current status of both stylized and tomographic phantoms, including Korean computational phantoms. Advantages, limitations, and future prospects are also discussed

  15. Rehabilitation of Glossectomy Cases with Tongue Prosthesis: A Literature Review.

    Science.gov (United States)

    Balasubramaniam, Muthu Kumar; Chidambaranathan, Ahila Singaravel; Shanmugam, Gokul; Tah, Rajdeep

    2016-02-01

    Tongue is the only movable muscular organ without any bone in the human body. It has very important role in perception of taste and sensations like touch, pressure, heat and cold. The purpose of the article is to review various types of tongue prosthesis and their clinical applications. This review helps the clinician to choose the appropriate type of tongue prosthesis for different clinical situations, retention of tongue prosthesis and material selection for each type of prosthesis. A broad search of published literature was performed using the keyword glossectomy, glossal prosthesis and tongue prosthesis from 1980 to 2014 in Medline, Google scholar, internet and text book. This review gives basic knowledge of glossal prosthesis and selection of the same for various clinical conditions. PMID:27042596

  16. Robotic lower limb prosthesis design through simultaneous computer optimizations of human and prosthesis costs

    OpenAIRE

    Handford, Matthew L.; Manoj Srinivasan

    2016-01-01

    Robotic lower limb prostheses can improve the quality of life for amputees. Development of such devices, currently dominated by long prototyping periods, could be sped up by predictive simulations. In contrast to some amputee simulations which track experimentally determined non-amputee walking kinematics, here, we explicitly model the human-prosthesis interaction to produce a prediction of the user’s walking kinematics. We obtain simulations of an amputee using an ankle-foot prosthesis by si...

  17. Fusion around cervical disc prosthesis: case report.

    NARCIS (Netherlands)

    Bartels, R.H.M.A.; Donk, R.

    2005-01-01

    OBJECTIVE AND IMPORTANCE: Cervical arthroplasty is a relatively new method to maintain motion after cervical anterior discectomy. Two cases are presented in which bony fusion occurred around a cervical disc prosthesis. CLINICAL PRESENTATION: A 30-year-old man and a 49-year-old woman underwent a righ

  18. Argus II retinal prosthesis system: An update.

    Science.gov (United States)

    Rachitskaya, Aleksandra V; Yuan, Alex

    2016-09-01

    This review focuses on a description of the Argus II retinal prosthesis system (Argus II; Second Sight Medical Products, Sylmar, CA) that was approved for humanitarian use by the FDA in 2013 in patients with retinitis pigmentosa with bare or no light perception vision. The article describes the components of Argus II, the studies on the implant, and future directions. PMID:26855177

  19. Do cavies talk?: The effect of anthropomorphic books on children's knowledge about animals

    Directory of Open Access Journals (Sweden)

    PatriciaAGanea

    2014-04-01

    Full Text Available Many books for young children present animals in fantastical and unrealistic ways, as wearing clothes, talking and engaging in human-like activities. This research examined whether anthropomorphism in children’s books affects children’s learning and conceptions of animals, by specifically assessing the impact of depictions (a bird wearing clothes and reading a book and language (bird described as talking and as having human intentions. In Study 1, 3-, 4-, and 5-year-old children saw picture books featuring realistic drawings of a novel animal. Half of the children also heard factual, realistic language, while the other half heard anthropomorphized language. In Study 2, we replicated the first study using anthropomorphic illustrations of real animals. The results show that the language used to describe animals in books has an effect on children’s tendency to attribute human-like traits to animals, and that anthropomorphic storybooks affect younger children’s learning of novel facts about animals. These results indicate that anthropomorphized animals in books may not only lead to less learning but also influence children’s conceptual knowledge of animals.

  20. Pain and pain-related interference in adults with lower-limb amputation: Comparison of knee-disarticulation, transtibial, and transfemoral surgical sites

    OpenAIRE

    Behr, James; Friedly, Janna; Molton, Ivan; Morgenroth, David; Jensen, Mark P.; Smith, Douglas G.

    2009-01-01

    Pain and pain-related interference with physical function have not been thoroughly studied in individuals who have undergone knee-disarticulation amputations. The principal aim of this study was to determine whether individuals with knee-disarticulation amputations have worse pain and pain-related interference with physical function than do individuals with transtibial or transfemoral amputations. We analyzed cross-sectional survey data provided by 42 adults with lower-limb amputations. These...

  1. Transfemoral sockets with vacuum-assisted suspension comparison of hip kinematics, socket position, contact pressure, and preference: Ischial containment versus brimless

    OpenAIRE

    Jason T. Kahle, MSMS, CPO, FAAOP; M. Jason Highsmith, PT, DPT, PhD, CP, FAAOP

    2013-01-01

    The objective of this study was to investigate the effect of brimless compared with ischial ramus containment (IRC) prosthetic sockets when using vacuum-assisted suspension (VAS) on persons with a unilateral transfemoral amputation (TFA). A randomized crossover design with a 2 d accommodation was used. People with unilateral TFA (n = 9 analyzed) were enrolled. Interventions were IRC VAS and brimless VAS sockets. Main outcome measures included coronal hip angle and vertical and lateral socket ...

  2. Determining delay created by multifunctional prosthesis controllers

    Directory of Open Access Journals (Sweden)

    Todd R. Farrell, PhD

    2011-07-01

    Full Text Available I am writing to express a concern that my colleagues from previous laboratories at Northwestern University/Rehabilitation Institute of Chicago (RIC and I have shared for a number of years related to multifunctional prosthesis control. Previous investigations have used a variety of analysis window attributes for their multifunctional prosthesis controllers [1-8]. Researchers have varied the length of the analysis window, the amount of overlap between consecutive windows, and the number of majority votes used in the postprocessing of the classifier decisions. However, we believe that many researchers have made decisions about these attributes with little regard for the overall delay created in the real-time system. (Note that the term classifier typically refers to an element of the controller that uses the inputs provided to it, e.g., electromyographic [EMG] signals, force sensor data, and position sensor data to decide which joint(s of the prosthesis should be actuated. For example, Peleg et al. performed classification decisions on data up to 1.4 seconds after the onset of the contraction [9]. This classifier would require its user to wait on the order of seconds for Peleg et al.'s prosthesis to respond, which would likely be quite frustrating for the user. We are not suggesting that new algorithms should not be explored simply because they may create substantial delays. However, we do believe that these delays should be considered and discussed in each article that is published on this topic. While a particular classifier may create a 1 percent increase in classification accuracy, if it cannot add this increase in accuracy in a reasonable amount of time, it may be a "nonstarter." Continuing in this vein, we would like to discuss some findings that we believe will allow prosthesis controller designers to better understand how their controllers will behave in real time. (For the purpose of this editorial, further use of "we" and "our" indicates

  3. Concept development of a tendon arm manipulator and anthropomorphic robotic hand

    Science.gov (United States)

    Tolman, C. T.

    1987-01-01

    AMETEK/ORED inhouse research and development efforts leading toward a next-generation robotic manipulator arm and end-effector technology is summarized. Manipulator arm development has been directed toward a multiple-degree-of-freedom, flexible, tendon-driven concept referred to here as a Tendon Arm Manipulator (TAM). End-effector development has been directed toward a three-fingered, dextrous, tendon-driven, anthropomorphic configuration which is referred to as an Anthropomorphic Robotic Hand (ARH). Key technology issues are identified for both concepts.

  4. Anthropomorphism in Sign Languages: A Look at Poetry and Storytelling with a Focus on British Sign Language

    Science.gov (United States)

    Sutton-Spence, Rachel; Napoli, Donna Jo

    2010-01-01

    The work presented here considers some linguistic methods used in sign anthropomorphism. We find a cline of signed anthropomorphism that depends on a number of factors, including the skills and intention of the signer, the animacy of the entities represented, the form of their bodies, and the form of vocabulary signs referring to those entities.…

  5. Development and clinical application of a new testicular prosthesis

    Institute of Scientific and Technical Information of China (English)

    Ye Ning; Zhikang Cai; Huixing Chen; Ping Ping; Peng Li; Zhong Wang; Zheng Li

    2011-01-01

    A new type of testicular prosthesis made of silastic with an elliptical shape to mimic a normal testis was developed by our team and submitted for patenting in China.The prosthesis was produced in different sizes to imitate the normal testis of the patient.To investigate the effects and safety of the testicular prosthesis,20 patients receiving testicular prosthesis implantation were recruited for this study.Follow-up after 6 months revealed no complications in the patients.All the patients answered that they were satisfied with their body image and the position of the implants,19 patients were satisfied with the size and 16 patients were satisfied with the weight.These results show that the testicular prosthesis used in this study can meet patient's expectations.Patients undergoing orchiectomy should be offered the option to receive a testicular prosthesis implantation.The dimensions and weight of the available prosthetic implants should be further addressed to improve patient satisfaction.

  6. Dental prosthesis and buccal lesions in the elderly

    OpenAIRE

    Beatriz García Alpizar; Mikhail Benet Rodíguez; Eduardo Enrique Castillo Betancourt

    2010-01-01

    Fundament: Buccal lesions in the elderly are very frequent and they constitute a problem of health due to the consequences that cause. Objective: to describe the characteristics of the removable prosthesis used by the population of 60 and more years age and their relationship with the lesions of the oral mucosa. Methods: We carried out a study descriptive of cross section in 125 elderly with oral prosthesis. The characteristics of the removable prosthesis were described and their relationship...

  7. Difficult factors in Management of Impacted Dental Prosthesis in Esophagus

    OpenAIRE

    Efiaty A. Soepardi

    2005-01-01

    A dental prosthesis which ingested and impacted in esophagus, is an emergency case and life threatening, so require immediate esophagoscopy intervention for removing. The objective of this study is to assess some factors can caused dtfficulties in diagnosing and treating the ingested and impacted dental prosthesis in the esophagus and their complications. This retrospective study analyzed patient’s chart whose underwent esophagoscopy for removing the impacted dental prosthesis in Dr. Cipto Ma...

  8. Self-contained inflatable penile prosthesis: magnetic resonance appearance

    International Nuclear Information System (INIS)

    The appearance of an inflatable penile prosthesis, visualized on a short tau inversion recovery sequence, is reported, in a patient who had magnetic resonance imaging for pelvic pain subsequent to radical cystoprostatectomy for bladder carcinoma. With suppression of adjacent fat signal, the prosthesis is well delineated from adjacent structures. The fluid-containing cylinders of the prosthesis are of very bright signal intensity, with the relief valve assembly of low signal intensity. 5 refs., 2 figs

  9. Biodegradation and biocompatibility of a degradable chitosan vascular prosthesis

    OpenAIRE

    Kong, Xiaoying; Xu, Wenhua

    2015-01-01

    An instrument made by ourselves was used to fabricate biodegradable chitosan-heparin artificial vascular prosthesis with small internal diameter (2 mm) and different crosslinking degree from biodegradable chitosan, chitosan derivates and heparin. In vivo and in vitro degradation studies, inflammatory analysis and electron microscope scanning of this artificial vascular prosthesis were performed. It was observed that 50% of the prosthesis decomposed in vivo and was replaced by natural tissues....

  10. Correlation analysis between the interface membrane and loose hip prosthesis

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Objective To analyze the cause of prosthesis loosening by observing the interface membranes harvested during the hip restoration operation. Methods A total of 28 specimens of interface membrane around the loose prosthesis were harvested from 28 patients undergoing the restoration of total hip replacement. All the specimens underwent the observation of appearance, light microscopy and scanning electronic microscopy(SEM). Results All the gaps around the loose prosthesis were filled with interface membrane of ...

  11. Tracheobronchial Foreign Body Aspiration: Dental Prosthesis

    Directory of Open Access Journals (Sweden)

    Ataman Köse

    2014-01-01

    Full Text Available It is important to extract foreign bodies for avoiding life-threatening complications. They can lead to death if they are not treated. Different signs and symptoms could occur according to the complete or partial airway obstruction. Foreign body aspiration is a rare incident in adults. The organic foreign materials such as foods are found to be aspirated more commonly and are usually settled in the right bronchial system. However, dental prosthesis and teeth aspirations are rare in literature. In our study, a 52-year-old male patient who had aspirated the front part of his lower dental prosthesis accidentally is presented and the foreign body is extracted by using rigid bronchoscopy. There are many causes of aspiration but dental prosthetic aspirations should be kept in mind during sleep. For this reason, dental apparatus must be taken out while asleep.

  12. Space orientation of total hip prosthesis

    International Nuclear Information System (INIS)

    A method for in vivo determination of orientation and relation in space of components of total hip prosthesis is described. The method allows for determination of the orientation of the prosthetic components in well defined anatomic planes of the body. Furthermore the range of free motion from neutral position to the point of contact between the edge of the acetabular opening and the neck of the femoral component can be determined in various directions. To assess the accuracy of the calculations a phantom prosthesis was studied in nine different positions and the measurements of the space oriented parameters according to the present method correlated to measurements of the same parameters according to Selvik's stereophotogrammetric method. Good correlation ws found. The role of prosthetic malpositioning and component interaction evaluated with the present method in the development of prosthetic loosening and displacement is discussed. (orig.)

  13. Gingival prosthesis: A treatment modality for recession

    OpenAIRE

    Pallavi Samatha Yalamanchili; Hemchand Surapaneni; Arunima Padmakumar Reshmarani

    2013-01-01

    Gingival recession caused due to periodontal disease disturbs patients because of sensitivity and esthetics. Gingival prosthesis may be fixed or removable and can be made from silicones, acrylics, composite resins or ceramics according to what is best suited for the case. The gingival veneer is esthetically appealing and easy to maintain. This case report describes the use of gingival veneer as a treatment modality for recession.

  14. Tracheobronchial Foreign Body Aspiration: Dental Prosthesis

    OpenAIRE

    Ataman Köse; Dilek Kostak; Erol Aramagan; Aslıhan Durak; Nur Sezin Seçkin; Serdar Süha Dönmez; Hüseyin Melek

    2014-01-01

    It is important to extract foreign bodies for avoiding life-threatening complications. They can lead to death if they are not treated. Different signs and symptoms could occur according to the complete or partial airway obstruction. Foreign body aspiration is a rare incident in adults. The organic foreign materials such as foods are found to be aspirated more commonly and are usually settled in the right bronchial system. However, dental prosthesis and teeth aspirations are rare in litera...

  15. Custom Ocular Prosthesis: A Palliative Approach

    OpenAIRE

    Prachi Thakkar; JR Patel; Rajesh Sethuraman; Narendra Nirmal

    2012-01-01

    The goal of palliative care is the achievement of the best quality of life for patients and their families. Eyes are generally the first features of the face to be noticed. Loss of an eye is a traumatic event which has a crippling effect on the psychology of the patient. Several ocular and orbital disorders require surgical intervention that may result in ocular defects. An ocular prosthesis is fabricated to restore the structure, function, and cosmetics of the defects created by such conditi...

  16. Trouble shooting with the Tracheo Esophageal Prosthesis

    OpenAIRE

    Thakar, A.; Bahadur, S

    2002-01-01

    Vocal rehabilitation of the laryngectomee can be dramatically improved by the Tracheo-Esophageal Puncture (TEP) technique. The greatest impediment to its increased use in our country has been the failure on the part of the Medical Community to provide these patients with day to day support and guidance on the use of the TEP prosthesis. This article seeks to address this deficiency and provides some guidance on the care and maintenance of the TEP.

  17. Fabrication of a Cranial Prosthesis Combined with an Ocular Prosthesis Using Rapid Prototyping: A Case Report.

    Science.gov (United States)

    Shankaran, Gayatri; Deogade, Suryakant Chhagan; Dhirawani, Rajesh

    2016-01-01

    Rapid prototyping (RP) is a technique of manufacturing parts by the additive layer manufacturing technology; where, a three-dimensional (3D) model created in a computer aided design (CAD) system is sectioned into 2D profiles, which are further constructed by RP layer by layer. Its use is not limited to industrial or engineering fields and has extended to the medical field for the manufacturing of custom implants and prostheses, the study of anatomy and surgical planning. Nowadays, dentists are more frequently encountered with the individuals affected with craniofacial defects due to trauma. In such cases, the craniomaxillofacial rehabilitation is a real challenge to bring the patients back to society and promote their well-being. The conventional impression technique for facial prosthesis fabrication has the disadvantage of deforming the soft tissue and causing discomfort for the patient. Herein, we describe the fabrication of a cranial prosthesis combined with an ocular prosthesis with RP and stereolithography. PMID:27536331

  18. Development of Receiver Stimulator for Auditory Prosthesis

    Directory of Open Access Journals (Sweden)

    K. Raja Kumar

    2010-05-01

    Full Text Available The Auditory Prosthesis (AP is an electronic device that can provide hearing sensations to people who are profoundly deaf by stimulating the auditory nerve via an array of electrodes with an electric current allowing them to understand the speech. The AP system consists of two hardware functional units such as Body Worn Speech Processor (BWSP and Receiver Stimulator. The prototype model of Receiver Stimulator for Auditory Prosthesis (RSAP consists of Speech Data Decoder, DAC, ADC, constant current generator, electrode selection logic, switch matrix and simulated electrode resistance array. The laboratory model of speech processor is designed to implement the Continuous Interleaved Sampling (CIS speech processing algorithm which generates the information required for electrode stimulation based on the speech / audio data. Speech Data Decoder receives the encoded speech data via an inductive RF transcutaneous link from speech processor. Twelve channels of auditory Prosthesis with selectable eight electrodes for stimulation of simulated electrode resistance array are used for testing. The RSAP is validated by using the test data generated by the laboratory prototype of speech processor. The experimental results are obtained from specific speech/sound tests using a high-speed data acquisition system and found satisfactory.

  19. Rehabilitation of a Patient with an Intra Oral Prosthesis and an Extra Oral Orbital Prosthesis Retained with Magnets

    OpenAIRE

    Pattanaik, Seema; Wadkar, Aarti P.

    2011-01-01

    This clinical case report deals with a rehabilitation of a patient with an extensive maxillary and orbital defect using an intra oral prosthesis obturating the maxillary defect and extra oral orbital prosthesis retained with rare-earth magnets for secondary retention; primary retention was derived by snug fit of the prosthesis to underlying and adjacent tissues. The rehabilitation resulted in improved function, esthetics and comfort to the patient thus enabling him to lead a normal life.

  20. General anaesthesia vs. conscious sedation for transfemoral aortic valve implantation: a single UK centre before-and-after study.

    Science.gov (United States)

    Miles, L F; Joshi, K R; Ogilvie, E H; Densem, C G; Klein, A A; O'Sullivan, M; Martinez, G; Sudarshan, C D; Abu-Omar, Y; Irons, J F

    2016-08-01

    Reported data suggest that 99% of transfemoral, transcatheter aortic valve implantations in the UK are performed under general anaesthesia. This before-and-after study is the first UK comparison of conscious sedation vs. general anaesthesia for this procedure. Patients who underwent general anaesthesia received tracheal intubation, positive pressure ventilation, radial arterial and central venous access and urinary catheterisation. Anaesthesia was maintained with propofol or sevoflurane. Patients who received conscious sedation had a fascia iliaca and ilioinguinal nerve block and low-dose remifentanil infusion, without invasive monitoring or urinary catheterisation. Recruitment took place between August 2012 and July 2015, with a 6-month crossover period between November 2013 and June 2014. A total of 88 patients were analysed, evenly divided between the two groups. Patients receiving conscious sedation had a shorter anaesthetic time (mean (SD) 121 (28) min vs. 145 (41) min; p < 0.001) and recovery room time (110 (50) min vs. 155 (48) min; p = 0.001), lower requirement for inotropes (4.6% vs 81.8%; OR (95% CI) 0.1 (0.002-0.050); p < 0.001) and a lower incidence of malignant dysrhythmia (0% vs 11.4%; p = 0.020). Conscious sedation appears a feasible alternative to general anaesthesia for this procedure and is associated with a reduced requirement for inotropic support and improved efficiency. PMID:27353456

  1. Assessment of transfemoral amputees using C-Leg and Power Knee for ascending and descending inclines and steps

    Directory of Open Access Journals (Sweden)

    Erik J. Wolf, PhD

    2012-08-01

    Full Text Available Adding active power to a prosthetic knee unit may improve function and reduce the potential for overuse injuries in persons with transfemoral amputation (TFA. Servicemembers who have sustained a TFA are often young and motivated to perform at high functional levels. The goal of this article is to compare the biomechanics of ramp and stair descent and ascent for participants using the C-Leg and the Power Knee (PK. Subjects were asked to ascend and descend an instrumented staircase and 12 degree ramp at their comfortable pace while equipped with retroreflective markers. Temporal-spatial and kinetic data were collected. Knee power generated by the nondisabled limb during stair ascent for subjects wearing the C-Leg was significantly greater than for those wearing the PK. Knee power generated by prosthetic knee units was significantly greater for subjects while wearing the PK. Although the PK reduced the power required from the nondisabled knee during stair climbing, it does not appear to be superior to the C-Leg for other tasks. Adding power to a prosthetic knee may reduce wear on the nondisabled limb; however, there are still limitations that require improvement.

  2. Construction of a anthropomorphic phantom for dose measurement in hands in brachytherapy procedures

    International Nuclear Information System (INIS)

    The main objective of this work was to show the differences between the dose value measured by dosimeter endpoint and the values measured in different points inside the hand during brachytherapy procedures. For this, the procedures involved in the handling of sources were analyzed and the simulated using an anthropomorphic phantom hand

  3. Is this car looking at you? How anthropomorphism predicts fusiform face area activation when seeing cars.

    Directory of Open Access Journals (Sweden)

    Simone Kühn

    Full Text Available Anthropomorphism encompasses the attribution of human characteristics to non-living objects. In particular the human tendency to see faces in cars has long been noticed, yet its neural correlates are unknown. We set out to investigate whether the fusiform face area (FFA is associated with seeing human features in car fronts, or whether, the higher-level theory of mind network (ToM, namely temporoparietal junction (TPJ and medial prefrontal cortex (MPFC show a link to anthropomorphism. Twenty participants underwent fMRI scanning during a passive car-front viewing task. We extracted brain activity from FFA, TPJ and MPFC. After the fMRI session participants were asked to spontaneously list adjectives that characterize each car front. Five raters judged the degree to which each adjective can be applied as a characteristic of human beings. By means of linear mixed models we found that the implicit tendency to anthropomorphize individual car fronts predicts FFA, but not TPJ or MPFC activity. The results point to an important role of FFA in the phenomenon of ascribing human attributes to non-living objects. Interestingly, brain regions that have been associated with thinking about beliefs and mental states of others (TPJ, MPFC do not seem to be related to anthropomorphism of car fronts.

  4. The Eyes have it : Eye Tracking Analysis of Anthropomorphic Car Fronts using Spatiotemporal Scan Statistics

    OpenAIRE

    Purucker, Christian; Jan R. Landwehr; Sprott, David E.; Herrmann, Andreas

    2011-01-01

    Eye tracking has traditionally relied on regions of interest as a data source for analysis. Although widespread, this methodology is prone to several limitations. A new approach for eye tracking data analysis relying on spatiotemporal scan statistics is proposed and an exemplary experiment on anthropomorphic car front design is conducted.

  5. Simultaneous transfemoral transcatheter mitral and tricuspid valve edge-to-edge repair (using MitraClip system) completed by atrial septal defect occlusion in a surgically inoperable patient. First-in-human report

    Science.gov (United States)

    Franz, Norbert; Ritter, Frank; Hofmann, Steffen; Stabel-Mahassine, Chourok; Warnecke, Henning; Thale, Joachim

    2015-01-01

    Transcatheter transfemoral mitral valve repair using the MitraClip system (Abbott Vascular, USA) is used in high-risk or inoperable patients with severe mitral regurgitation. We report the first-in-human simultaneous transfemoral clipping of the mitral and tricuspid valve completed by occlusion of an atrial septal defect (ASD). The procedure was performed in an 84-year-old patient in October 2015. After effective reduction of mitral and tricuspid regurgitations using the MitraClip system a PFO Occluder (St. Jude Medical, USA) was implanted. Transfemoral simultaneous mitral and tricuspid valve repair using the MitraClip system with ASD occlusion seems to be an effective therapy for high-risk or inoperable patients. PMID:26855642

  6. Simultaneous transfemoral transcatheter mitral and tricuspid valve edge-to-edge repair (using MitraClip system) completed by atrial septal defect occlusion in a surgically inoperable patient. First-in-human report.

    Science.gov (United States)

    Kowalski, Marek; Franz, Norbert; Ritter, Frank; Hofmann, Steffen; Stabel-Mahassine, Chourok; Warnecke, Henning; Thale, Joachim

    2015-12-01

    Transcatheter transfemoral mitral valve repair using the MitraClip system (Abbott Vascular, USA) is used in high-risk or inoperable patients with severe mitral regurgitation. We report the first-in-human simultaneous transfemoral clipping of the mitral and tricuspid valve completed by occlusion of an atrial septal defect (ASD). The procedure was performed in an 84-year-old patient in October 2015. After effective reduction of mitral and tricuspid regurgitations using the MitraClip system a PFO Occluder (St. Jude Medical, USA) was implanted. Transfemoral simultaneous mitral and tricuspid valve repair using the MitraClip system with ASD occlusion seems to be an effective therapy for high-risk or inoperable patients. PMID:26855642

  7. A direct bonded fixed partial dental prosthesis: a clinical report.

    Science.gov (United States)

    Tanoue, Naomi; Tanaka, Takuo

    2015-01-01

    A direct bonded fixed partial dental prosthesis, with a composite resin denture tooth as a pontic, a tri-n-butylborane initiated adhesive resin, and screw posts for reinforcement, was still functioning after an observation period of 20 years. The prosthesis was found to be reliable for long-term clinical use when chemically and mechanically reinforced. PMID:25277033

  8. Results of Heart Valve Replacement with the SORIN Prosthesis

    OpenAIRE

    Colombo, Tiziano; Donatelli, Francesco; Quaini, Eugenio; Vitali, Ettore; Pellegrini, Alessandro

    1987-01-01

    From March 1977 to December 1981, 872 patients at our institution underwent valve replacement with a pyrolytic carbon tilting disc prosthesis manufactured in Italy by SORIN-Biomedica. To verify the performance characteristics of this prosthesis, we analyzed the intermediate-term results obtained over a cumulative total of 3,041 patient-years (pt-yr) of follow-up.

  9. Magnet-Retained Facial Prosthesis Combined with Maxillary Obturator

    OpenAIRE

    Mahnaz Hatami; Hamid Badrian; Siamak Samanipoor; Marcelo Coelho Goiato

    2013-01-01

    Prosthetic rehabilitation of the midfacial defects has always perplexed prosthodontists. These defects lead to functional and esthetic deficiencies. The purpose of this clinical case report was the presentation of the prosthetic rehabilitation of an extraoral-intraoral defect using two-piece prosthesis magnetically connected. This prosthesis has dramatically improved the patient’s speech, mastication, swallowing, and esthetic.

  10. Placement of prosthesis after total maxillectomy in edentulous patient

    OpenAIRE

    Sinha, Vikas; Bhowate, R. R.; Raizada, R. M.; Jain, S. K. T.; N.Chaturvedi, V.

    1999-01-01

    It is very difficult to retain the prosthesis in edentulous patient after total maxillectomy as there are no teeth on the opposite side around which clasp can be applied, however if holes are drilled in obturator and in alveolar ridge and wire is passed through it, prosthesis can be retained satisfactorily.

  11. A direct bonded fixed partial dental prosthesis: A clinical report

    OpenAIRE

    Tanoue, Naomi; Tanaka, Takuo

    2015-01-01

    A direct bonded fixed partial dental prosthesis, with a composite resin denture tooth as a pontic, a tri-n-butylborane initiated adhesive resin, and screw posts for reinforcement, was still functioning after an observation period of 20 years. The prosthesis was found to be reliable for long-term clinical use when chemically and mechanically reinforced.

  12. Use of Jonas Silicon-Silver prosthesis in erectile impotence.

    OpenAIRE

    Rowe, P H; Royle, M. G.

    1983-01-01

    Eleven patients presenting over the last three years with erectile impotence who have been treated by the insertion of the Jonas Silicon-Silver penile prosthesis are reviewed. The insertion of this prosthesis is a minor procedure. It has a simple design, low cost, no permanent erection or mechanical problems and an excellent cosmetic and functional result.

  13. 21 CFR 872.3970 - Interarticular disc prosthesis (interpositional implant).

    Science.gov (United States)

    2010-04-01

    ... implant). 872.3970 Section 872.3970 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... disc prosthesis (interpositional implant). (a) Identification. An interarticular disc prosthesis (interpositional implant) is a device that is intended to be an interface between the natural articulating...

  14. Penile Corporeal Reconstruction during Difficult Placement of a Penile Prosthesis

    Directory of Open Access Journals (Sweden)

    Viet Q. Tran

    2008-01-01

    Full Text Available For some patients with impotence and concomitant severe tunical/corporeal tissue fibrosis, insertion of a penile prosthesis is the only option to restore erectile function. Closing the tunica over an inflatable penile prosthesis in these patients can be challenging. We review our previous study which included 15 patients with severe corporeal or tunical fibrosis who underwent corporeal reconstruction with autologous rectus fascia to allow placement of an inflatable penile prosthesis. At a mean follow-up of 18 months (range 12 to 64, all patients had a prosthesis that was functioning properly without evidence of separation, herniation, or erosion of the graft. Sexual activity resumed at a mean time of 9 weeks (range 8 to 10. There were no adverse events related to the graft or its harvest. Use of rectus fascia graft for coverage of a tunical defect during a difficult penile prosthesis placement is surgically feasible, safe, and efficacious.

  15. Real-time myoelectric control of a multi-fingered hand prosthesis using principal components analysis

    Directory of Open Access Journals (Sweden)

    Matrone Giulia C

    2012-06-01

    Full Text Available Abstract Background In spite of the advances made in the design of dexterous anthropomorphic hand prostheses, these sophisticated devices still lack adequate control interfaces which could allow amputees to operate them in an intuitive and close-to-natural way. In this study, an anthropomorphic five-fingered robotic hand, actuated by six motors, was used as a prosthetic hand emulator to assess the feasibility of a control approach based on Principal Components Analysis (PCA, specifically conceived to address this problem. Since it was demonstrated elsewhere that the first two principal components (PCs can describe the whole hand configuration space sufficiently well, the controller here employed reverted the PCA algorithm and allowed to drive a multi-DoF hand by combining a two-differential channels EMG input with these two PCs. Hence, the novelty of this approach stood in the PCA application for solving the challenging problem of best mapping the EMG inputs into the degrees of freedom (DoFs of the prosthesis. Methods A clinically viable two DoFs myoelectric controller, exploiting two differential channels, was developed and twelve able-bodied participants, divided in two groups, volunteered to control the hand in simple grasp trials, using forearm myoelectric signals. Task completion rates and times were measured. The first objective (assessed through one group of subjects was to understand the effectiveness of the approach; i.e., whether it is possible to drive the hand in real-time, with reasonable performance, in different grasps, also taking advantage of the direct visual feedback of the moving hand. The second objective (assessed through a different group was to investigate the intuitiveness, and therefore to assess statistical differences in the performance throughout three consecutive days. Results Subjects performed several grasp, transport and release trials with differently shaped objects, by operating the hand with the myoelectric

  16. Difficult factors in Management of Impacted Dental Prosthesis in Esophagus

    Directory of Open Access Journals (Sweden)

    Efiaty A. Soepardi

    2005-03-01

    Full Text Available A dental prosthesis which ingested and impacted in esophagus, is an emergency case and life threatening, so require immediate esophagoscopy intervention for removing. The objective of this study is to assess some factors can caused dtfficulties in diagnosing and treating the ingested and impacted dental prosthesis in the esophagus and their complications. This retrospective study analyzed patient’s chart whose underwent esophagoscopy for removing the impacted dental prosthesis in Dr. Cipto Mangunkusumo General Hospital, Jakarta, Indonesia during a period between January 1997 and December 2003. Neck-chest X-ray and esophagoscopy were performed in all patients to identify the existence of the dental prosthesis as a diagnostic and treatment procedure. The length of time for removing the dental prosthesis was recorded and stated as a less difficult esophagoscopy when it takes time less than 60 minutes and as a difficult  esophagoscopy takes 60 minutes or longer. Some risk difficulties factors were statistically analyzed. There were 53 patients of ingested dental prosthesis in esophagus. Only 51 cases were analyzed According to the length of time for removing the dental prosthesis by esophagoscopy, 22 patients were recorded as less difficult cases and 29 patients as difficult cases. Two cases among the cases needed cervicotomy after unsuccessful esophagoscopy removal. The difficulties to diagnose an impacted dental prosthesis in the esophagus caused by unreliable clinical history, unclear signs and symptoms, unable to be detected by X-ray and was not found during esophagoscopy. The difficulties in treating due to mucosal laceration, edema, bleeding, failure of the first extraction and conformity with the size and shape, the wire outside the dental prosthesis and the length of time stayed in the esophagus. (Med J Indones 2005; 14: 33-6Keywords: ingested dental prosthesis, radioluscent foreign body, length of time of esophagoscopy

  17. The Nijdam voice prosthesis : A self-retaining valveless voice prosthesis for vocal rehabilitation after total laryngectomy

    NARCIS (Netherlands)

    van den Hoogen, Frank J. A.; Nijdam, Hoite F.; Veenstra, Aalze; Manni, JJ

    1996-01-01

    Voice prosthesis-assisted speech rehabilitation after total laryngectomy has proven to be successful in the majority of patients and exceeds the results of traditional oesophageal speech. Nevertheless 10-30% failure rates are still reported. In part this is due to prosthesis-related problems, in par

  18. Site development interim removable dental prosthesis.

    Science.gov (United States)

    Pasquinelli, Kirk L; Sze, Alexander J; Matosian, Alex J

    2016-07-01

    Transitioning a patient with partial edentulism through hard and soft tissue grafting to an implant restoration with an interim removable dental prosthesis (IRDP) presents a challenge to the restorative dentist. The management of grafted sites requires care, and without the appropriate design, an IRDP may impede surgical outcomes and place the graft at risk for displacement or necrosis. A site development IRDP (SDIRDP) for a grafted site must fulfill restorative goals and promote the surgical objectives for site development. A technique is described for fabricating an SDIRDP that facilitates surgical procedures and maintains prosthetic goals. PMID:26831920

  19. Poor fixation of the Mittelmeier hip prosthesis

    International Nuclear Information System (INIS)

    We have evaluated 30 Mittelmeier hips on an average 3.3 years after the operation. Seven hips had been revised because of severe pain and mechanical loosening and one because of fracture of the threaded ceramic cup. Only five of the remaining 22 hips were asymptomatic. There was radiographic migration of the acetabular and femoral components in more than one third of the hips and increased scintimetric values around the femoral component in all but two hips. Unfavorable design of the Mittelmeier prosthesis may be an important etiologic factor contributing to poor component fixation and inferior clinical results. (author)

  20. Malfunctioned and Fractured Penile Prosthesis Caused by Cross Placement: Case Report

    Directory of Open Access Journals (Sweden)

    Nihat Karakoyunlu

    2015-05-01

    Full Text Available Penile prosthesis is a functional option for patients who have erectile dysfunction after failed medical and intracavernosal treatments. Malleable penile prosthesis is a good alternative. Penile prosthesis implantation is a surgical process. Seldomly complications occur. In this study we presented a 61 y old man who has malfunctioned and broken penile prosthesis due to cross implantation.

  1. Malfunctioned and Fractured Penile Prosthesis Caused by Cross Placement: Case Report

    OpenAIRE

    Nihat Karakoyunlu; Sercan Sarı; Harun Ozdemir; Hikmet Topaloglu; Ugur Ozok; Levent Sagnak; Hamit Ersoy

    2015-01-01

    Penile prosthesis is a functional option for patients who have erectile dysfunction after failed medical and intracavernosal treatments. Malleable penile prosthesis is a good alternative. Penile prosthesis implantation is a surgical process. Seldomly complications occur. In this study we presented a 61 y old man who has malfunctioned and broken penile prosthesis due to cross implantation.

  2. Analysis of the IHC Adaptation for the Anthropomorphic Speech Processing Systems

    Directory of Open Access Journals (Sweden)

    Petrovsky Alexander A

    2005-01-01

    Full Text Available We analyse the properties of the physiological model of the adaptive behaviour of the chemical synapse between inner hair cells (IHC and auditory neurons. On the basis of the performed analysis, we propose equivalent structures of the model for implementation in the digital domain. The main conclusion of the analysis is that the synapse reservoir model is equivalent in its properties to the signal-dependent automatic gain-control mechanism. We plot guidelines for creation of artificial anthropomorphic algorithms, which exploit properties of the original synapse model. This paper also presents a concise description of the experiments, which prove the presence of the positive effect from the introduction of the depicted anthropomorphic algorithm into feature extraction of the automated speech recognition engine.

  3. Application of GEANT4 radiation transport toolkit to dose calculations in anthropomorphic phantoms

    CERN Document Server

    Rodrigues, P; Peralta, L; Alves, C; Chaves, A; Lopes, M C

    2003-01-01

    In this paper we present the implementation of a dose calculation application, based on the GEANT4 Monte Carlo toolkit. Validation studies were performed with an homogeneous water phantom and an Alderson--Rando anthropomorphic phantom both irradiated with high--energy photon beams produced by a clinical linear accelerator. As input, this tool requires computer tomography images for automatic codification of voxel based geometries and phase space distributions to characterize the incident radiation field. Simulation results were compared with ionization chamber, thermoluminescent dosimetry data and commercial treatment planning system calculations. In homogeneous water phantom, overall agreement with measurements were within 1--2%. For anthropomorphic simulated setups (thorax and head irradiation) mean differences between GEANT4 and TLD measurements were less than 2%. Significant differences between GEANT4 and a semi--analytical algorithm implemented in the treatment planning system, were found in low density ...

  4. Development of an anthropomorphic head phantom using dolomite and polymethyl methacrylate for dosimetry in computed tomography

    Science.gov (United States)

    Ximenes, R. E.; Silva, A.; Balbino, D.; Poletti, M. E.; Maia, A. F.

    2015-12-01

    A real human skull was selected to be a mold for the construction of an anthropomorphic head phantom with a mixture of dolomite and polymethyl methacrylate (PMMA). Using linear attenuation coefficients, we show that it is possible to use dolomite as a bone simulator as long as the proportion of the mixture is 1:1. Acrylic tubes were placed in the phantom constructed to enable the insertion of the ionization chamber to estimate the effective dose. Values for a typical head computed tomography examination found in the literature vary from 0.9 to 4.0 mSv. Dosimetric studies showed that the effective dose for the anthropomorphic phantom was (2.70±0.03) mSv and for the geometric PMMA phantom (3.67±0.04) mSv, values which are in agreement with the intervals reported in the literature. The investment to produce the phantom was approximately US160.00.

  5. Development of pathological anthropomorphic models using 3D modelling techniques for numerical dosimetry

    International Nuclear Information System (INIS)

    Computational exposure models can be used to estimate human body absorbed dose in a series of situations such as X-Ray exams for diagnosis, accidents and medical treatments. These models are fundamentally composed of an anthropomorphic simulator (phantom), an algorithm that simulates a radioactive source and a Monte Carlo Code. The accuracy of data obtained in the simulation is strongly connected to the adequacy of such simulation to the real situation. The phantoms are one of the key factors for the researcher manipulation. They are generally developed in supine position and its anatomy is patronized by compiled data from international institutions such as ICRP or ICRU. Several pathologies modify the structure of organs and body tissues. In order to measure how significant these alterations are, an anthropomorphic model was developed for this study: patient mastectomies. This model was developed using voxel phantom FASH and then coupled with EGSnrc Monte Carlo code

  6. Anthropomorphism and Advertising Effectiveness: Moderating Roles of Product Involvement and The Type of Consumer Need

    OpenAIRE

    BAŞFIRINCI, Cigdem; ÇİLİNGİR, Zuhal

    2015-01-01

    Abstract. The goal of this study is to explore that whether using anthropomorphism in ads stimulates active information processing by increasing attention paid to the brand and creates some positive results on brand recall and attitude toward the brand. In this context, moderating roles of involvement level and product type were also investigated. Using experimental design, hypotheses were tested in two product groups. Offering important insights to practitioners to build an effective adverti...

  7. Flexydos3D: A new deformable anthropomorphic 3D dosimeter readout with optical CT scanning

    International Nuclear Information System (INIS)

    A new deformable polydimethylsiloxane (PDMS) based dosimeter is proposed that can be cast in an anthropomorphic shape and that can be used for 3D radiation dosimetry of deformable targets. The new material has additional favorable characteristics as it is tissue equivalent for high-energy photons, easy to make and is non-toxic. In combination with dual wavelength optical scanning, it is a powerful dosimeter for dose verification of image gated or organ tracked radiotherapy with moving and deforming targets

  8. AR-601 anthropomorphic robot modeling and virtualization toolset for research and education purposes

    Science.gov (United States)

    Sirazetdinov, R.; Kamalov, A.; Nikitina, D.; Katsevman, E.

    2016-06-01

    A program toolset for modeling and visualization of anthropomorphic robot AR-601 produced by “NPO Androidnaya technika” was implemented, allowing one to test the components of the control system and to debug control algorithms on a virtual model of the robot. The toolset might be used for both scientific and educational purposes. The work is performed according to the Russian Government Program of Competitive Growth of the Kazan Federal University (KFU).

  9. A method to acquire CT organ dose map using OSL dosimeters and ATOM anthropomorphic phantoms

    OpenAIRE

    Zhang, Da; Li, Xinhua; Gao, Yiming; Xu, X. George; Liu, Bob

    2013-01-01

    Purpose: To present the design and procedure of an experimental method for acquiring densely sampled organ dose map for CT applications, based on optically stimulated luminescence (OSL) dosimeters “nanoDots” and standard ATOM anthropomorphic phantoms; and to provide the results of applying the method—a dose data set with good statistics for the comparison with Monte Carlo simulation result in the future.

  10. Optimal Selection of Measurement Configurations for Stiffness Model Calibration of Anthropomorphic Manipulators

    OpenAIRE

    Klimchik, Alexandr; Wu, Yier; Pashkevich, Anatol; Caro, Stéphane; Furet, Benoît

    2012-01-01

    International audience The paper focuses on the calibration of elastostatic parameters of spatial anthropomorphic robots. It proposes a new strategy for optimal selection of the measurement configurations that essentially increases the efficiency of robot calibration. This strategy is based on the concept of the robot test-pose and ensures the best compliance error compensation for the test configuration. The advantages of the proposed approach and its suitability for practical application...

  11. Radiation dose evaluation of dental cone beam computed tomography using an anthropomorphic adult head phantom

    International Nuclear Information System (INIS)

    Dental cone beam computed tomography (CBCT) provides high-resolution tomographic images and has been gradually used in clinical practice. Thus, it is important to examine the amount of radiation dose resulting from dental CBCT examinations. In this study, we developed an in-house anthropomorphic adult head phantom to evaluate the level of effective dose. The anthropomorphic phantom was made of acrylic and filled with plaster to replace the bony tissue. The contour of the head was extracted from a set of adult computed tomography (CT) images. Different combinations of the scanning parameters of CBCT were applied. Thermoluminescent dosimeters (TLDs) were used to measure the absorbed doses at 19 locations in the head and neck regions. The effective doses measured using the proposed phantom at 65, 75, and 85 kVp in the D-mode were 72.23, 100.31, and 134.29 µSv, respectively. In the I-mode, the effective doses were 108.24, 190.99, and 246.48 µSv, respectively. The maximum percent error between the doses measured by the proposed phantom and the Rando phantom was l4.90%. Therefore, the proposed anthropomorphic adult head phantom is applicable for assessing the radiation dose resulting from clinical dental CBCT. - Highlights: • A home-made anthropomorphic adult head phantom was proposed. • The proposed phantom can be easily built with lower price than the standard Rando phantom. • The proposed phantom can be used for evaluating the effective dose during dental CBCT scanning

  12. Generation of human-like motion on anthropomorphic systems using inverse dynamics

    OpenAIRE

    Saab, Layale; Souères, Philippe; Mansard, Nicolas; Fourquet, Jean-Yves

    2012-01-01

    This work deals with the generation of human-like whole-body movements on anthropomorphic systems. We propose a general framework to generate robot movements from the definition of ordered stack of tasks and a global resolution scheme that enables to consider different kinds of constraints. We compare qualitatively the robot movements generated from this software with similar recorded human movements. We start with a direct global comparison of body movements. Then we analyze the magnitude of...

  13. Shah's Indian penile prosthesis placement after phallic reconstruction with radial forearm flap

    OpenAIRE

    Patwardhan, Sujata K; Shah, Rupin; Kulkarni, Vijay; Varma, Radheshyam R.

    2008-01-01

    We report a successful implantation of Indian penile prosthesis after total phallic reconstruction. The differential stiffness of the Shah penile prosthesis is felt to have less potential for erosion, the most common complication of rigid prosthetic stiffening devices when used in a neo-phallus. This prosthesis is an alternative to the inflatable prosthesis in patients who choose a rigid prosthesis due to economical constraints.

  14. Incidence of vascular complications in patients submitted to percutaneous transluminal coronary angioplasty by transradial and transfemoral arterial approach Incidencia de complicaciones vasculares en pacientes sometidos a angioplastía coronaria transluminal percutánea por vía arterial transradial y transfemoral Incidência de complicações vasculares em pacientes submetidos a angioplastia coronariana transluminal percutânea por via arterial transradial e transfemoral

    Directory of Open Access Journals (Sweden)

    Marinez Kellermann Armendaris

    2008-03-01

    Full Text Available OBJECTIVE: To describe the vascular complications of transradial and transfemoral artery punctures in patients submitted to percutaneous transluminal coronary angioplasty (PTCA. METHODS: Prospective cohort study including patients submitted to PTCA. An interview was performed and an instrument applied to collect risk factors/predictors of complications. After the procedure, a physical examination was performed, vital signs were measured and the puncture site was assessed. RESULTS: 199 patients were included, age 64±10 years. Complications found for the radial and femoral approach were respectively: ecchymosis (18.29%, (17.14%; bruising (17.66%, (14.27%; urinary retention (2.43%, (25.71%; loss of vessel permeability (8.53%, (0%. CONCLUSION: The complications found were considered minor or secondary, depending on the classification found in literature. A higher rate of vascular complications related to transradial artery punctures compared to the interventions performed by transfemoral approach.OBJETIVO: Describir complicaciones vasculares relacionadas a punciones arteriales transradial y transfemoral en pacientes sometidos a angioplastía coronaria transluminal percutánea (ACTP. MÉTODOS: Se trata de un estudio de cohorte prospectivo realizado con pacientes sometidos a ACTP. Se llevó a cabo una entrevista y aplicó un instrumento para obtener factores de riesgo/predictores. Fue realizado un examen físico, medición de signos vitales y se evaluó el lugar de punción. RESULTADOS: Fueron incluidos 199 pacientes, edad 64±10 años. Las complicaciones encontradas para vía radial y femoral respectivamente, fueron: esquimosis (18,29%, (17,14%; hematoma (17,66%, (14,27%; retención urinaria (2,43%, (25,71%; pérdida de permeabilidad de vaso (8,53%, (0%. CONCLUSIÓN: Las complicaciones fueron consideradas menores o secundarias conforme clasificación literaria. Existe una mayor incidencia de complicaciones vasculares relacionadas a punciones

  15. Dental prosthesis and buccal lesions in the elderly

    Directory of Open Access Journals (Sweden)

    Beatriz García Alpizar

    2010-02-01

    Full Text Available Fundament: Buccal lesions in the elderly are very frequent and they constitute a problem of health due to the consequences that cause. Objective: to describe the characteristics of the removable prosthesis used by the population of 60 and more years age and their relationship with the lesions of the oral mucosa. Methods: We carried out a study descriptive of cross section in 125 elderly with oral prosthesis. The characteristics of the removable prosthesis were described and their relationship with the lesions of the oral mucosa. The square chi tests and the analysis of relative risk were use to determine the association between the variables, also we used a logistical regression model to determine the independent relationship of each factor with the presence of the lesions. Results: We was a 12% of the people with stomatitis sub prosthesis, 8% presented lesions growth hyperplasic and 5,6% they were have angular queilitis. The lesions in the oral mucosa increased in people with prosthesis in not well state, bad hygiene this and in the female sex. Conclusion: the chronic lesions were the more prevalence in this study and they were very related with factors like: state of the conservation the prosthesis, time use, hygiene this and sex of the individual; but when determining the independent influence from each factor with the presence lesions, we established that only the state of conservation of the prosthesis and their hygiene affected of the important way to the old men of this study.

  16. Impact of hip prosthesis on dose distribution of pelvic radiotherapy

    International Nuclear Information System (INIS)

    Objective: To study the scattering effect of Co-Cr-Mo hip prosthesis which was high Z material for patients undergoing pelvic irradiation. Methods: The hip prosthesis was set in water phantom (30 cm x 30 cm x 30 cm), determining points were chosen on the entrance side of both 6 MV and 10 MV beams at the distance of 0.5 cm, 1.0 cm, 2.0 cm to the hip prosthesis, and also on the exit side of both 6 MV and 10 MV beams at the distance of 3.0 cm, 5.0 cm, 7.0 cm to the hip prostheses. Dose behind the hip prosthesis at depths of 5.0 cm and 10.0 cm for 6 MV and 10 MV beams are also measured. Results: The dose deviation on the beams' entrance side is between 0 to 5.0%, the backscatter effect was more obviously with the higher energy beam. The dose deviation on the beams' exit side was between 21.6%-30.8%. With the same field size and depth, dose deviation becomes smaller when the beam energy was higher; while with the same energy and depth, dose deviation becomes smaller when the field size was bigger. Dose profiles behind the head of the hip prosthesis indicate obvious attenuation of the beam. Conclusions: Beam arrangements that avoid the prosthesis should be considered first or we should at least reduce the weight of the beam that pass through the prosthesis. (authors)

  17. Anthropomorphic “Motion Design” on Non-Holonomic Vehicle for Intuitive Interface

    Directory of Open Access Journals (Sweden)

    Sho Yokota

    2012-11-01

    Full Text Available In the case of operating a vehicle, if the interface extracts human intention correctly and naturally, and if the vehicle moves like a human, then the human feels this operation to be intuitive. For realizing intuitive operation, this paper proposes motion design which makes vehicle motion anthropomorphic. The strategy of this motion design is: for making anthropomorphic motion, a certain normative motion for the vehicle is needed. Thus, we measure several subjectsʹ motion in order to create normative motion. But these motions are different due to individual characteristics, because human motions are described in the time domain. Therefore, the human motion in the time domain is plotted to the phase plane. In the phase plane each subjectsʹ motion was almost the same ellipse and then we fitted these ellipses to one ellipse by the least square method. Thus, we adopt this fitted ellipse as normative motion and call it “standard human motion”. The standard human motion is implemented on the actual non‐holonomic vehicle and evaluated by the Semantic Differential (SD method. From the results, we discovered that our motion design can create anthropomorphic vehicle motion.

  18. Characterisation of an anthropomorphic chest phantom for dose measurements in radiology beams

    Science.gov (United States)

    Henriques, L. M. S.; Cerqueira, R. A. D.; Santos, W. S.; Pereira, A. J. S.; Rodrigues, T. M. A.; Carvalho Júnior, A. B.; Maia, A. F.

    2014-02-01

    The objective of this study was to characterise an anthropomorphic chest phantom for dosimetric measurements of conventional radiology beams. This phantom was developed by a previous research project at the Federal University of Sergipe for image quality control tests. As the phantom consists of tissue-equivalent material, it is possible to characterise it for dosimetric studies. For comparison, a geometric chest phantom, consisting of PMMA (polymethylmethacrylate) with dimensions of 30×30×15 cm³ was used. Measurements of incident air kerma (Ki) and entrance surface dose (ESD) were performed using ionisation chambers. From the results, backscatter factors (BSFs) of the two phantoms were determined and compared with values estimated by CALDose_X software, based on a Monte Carlo simulation. For the technical parameters evaluated in this study, the ESD and BSF values obtained experimentally showed a good similarity between the two phantoms, with minimum and maximum difference of 0.2% and 7.0%, respectively, and showed good agreement with the results published in the literature. Organ doses and effective doses for the anthropomorphic phantom were also estimated by the determination of conversion coefficients (CCs) using the visual Monte Carlo (VMC) code. Therefore, the results of this study prove that the anthropomorphic thorax phantom proposed is a good tool to use in dosimetry and can be used for risk evaluation of X-ray diagnostic procedures.

  19. Transfemoral Aortic Valve Implantation with the New Edwards Sapien 3 Valve for Treatment of Severe Aortic Stenosis—Impact of Valve Size in a Single Center Experience

    Science.gov (United States)

    Wöhrle, Jochen; Gonska, Birgid; Rodewald, Christoph; Seeger, Julia; Scharnbeck, Dominik; Rottbauer, Wolfgang

    2016-01-01

    Aims The third generation Edwards Sapien 3 (Edwards Lifesciences Inc., Irvine, California) system was optimized to reduce residual aortic regurgitation and vascular complications. Methods and Results 235 patients with severe symptomatic aortic stenosis were prospectively enrolled. Transcatheter aortic valve implantations (TAVI) were performed without general anesthesia by transfemoral approach. Patients were followed for 30 days. Patients received 23mm (N = 77), 26mm (N = 91) or 29mm (N = 67) valve based on pre-procedural 256 multislice computer tomography. Mean oversizing did not differ between the 3 valves. There was no residual moderate or severe aortic regurgitation. Rate of mild aortic regurgitation and regurgitation index did not differ between groups. There was no switch to general anesthesia or conversion to surgery. Rate of major vascular complication was 3.0% with no difference between valve and delivery sheath sizes. Within 30 days rates of all cause mortality (2.6%) and stroke (2.1%) were low. Conclusions In patients with severe aortic stenosis transfemoral TAVI with the Edwards Sapien 3 valve without general anesthesia was associated with a high rate of device success, no moderate or severe residual aortic regurgitation, low rates of major vascular complication, mortality and stroke within 30 days with no difference between the 3 valve sizes. Trial Registration ClinicalTrials.gov NCT02162069 PMID:27003573

  20. Percutaneous transfemoral placement of a new flexible stent-graft into the thoracic aorta followed by a percutaneous suture-mediated closure of the access site - initial experience

    International Nuclear Information System (INIS)

    To evaluate the transfemoral placement of a new, flexible stent-graft into the thoracic aorta and the suture-mediated closure of the femoral access. Patients and Methods: five patients were treated endovascularly with a stent-graft for an aneurysm (n = 3) or acute dissection (n = 2) of the thoracic aorta via a femoral 24 F sheath. The femoral access site was closed with two suture-mediated closure devices after placement of the stent-graft. Results: the aneurysm or the false lumen was excluded from perfusion by the placement of the stent-graft in all patients. Hemostasis at the femoral access site was successful in all patients with the percutaneous suture device. A minor stenosis of the femoral artery was found angiographically in four patients after suture-mediated closure. Besides a reversible renal failure due to the medically induced hypotension for the treatment of an acutely ruptured aneurysm, no complications resulted from the stent-graft placement or the percutaneous suture. Conclusion: the percutaneous transfemoral placement of stent-grafts in the thoracic aorta using a suture-mediated closure of the access site is technically feasible. Long-term results of the technique have to be awaited. (orig.)

  1. The bionic eye (electronic visual prosthesis): a review.

    Science.gov (United States)

    Suaning, G J; Lovell, N H; Schindhelm, K; Coroneo, M T

    1998-08-01

    The concept of a visual prosthesis for the blind or partially sighted is not a new one. Indeed, for more than three decades this technology based treatment for blindness has appeared imminent. Despite the concerted efforts of numerous physicians, scientists and engineers, the successful application of a useful visual prosthesis remains elusive. The present review will endeavour to describe past efforts, investigate the present state of the art and indicate the obstacles that must be overcome in order to bring an electronic visual prosthesis to fruition. PMID:9717748

  2. A modified technique for retention of orbital prosthesis

    Directory of Open Access Journals (Sweden)

    Sameera R Shaikh

    2011-01-01

    Full Text Available An orbital defect (congenital or acquired causes severe facial asymmetry and disfigurement, which results in psychological and social disturbances to the patient. It becomes a challenging task for a maxillofacial prosthodontist to fabricate a prosthesis that replicates the healthy side of the face. Success of the prosthesis depends primarily on satisfactory retention of the same. This clinical report illustrates rehabilitation of a patient with an orbital defect by fabricating a hollow orbital prosthesis, utilizing anatomical undercuts for retention using an acrylic resin template relined by a resilient denture liner.

  3. Sex therapy for the penile prosthesis recipient.

    Science.gov (United States)

    Schover, L R

    1989-02-01

    In conclusion, the evidence for technical success of the penile prosthesis is clear, but more detailed follow-up studies suggest that a large minority of patients and partners fail to achieve sexual satisfaction. If the goal of surgery is to restore sexual frequency, variety, and pleasure to optimal levels, an integrated treatment program that incorporates sex therapy may be more successful than implantation alone. The type of sex therapy required depends on the risk factors present for postsurgery sexual dissatisfaction. A majority of patients can benefit from several sessions of brief sexual counseling preoperatively, with routine follow-up at 3 and 6 months after surgery to identify problems in resuming sex successfully. I also would point out that an integrated treatment approach is just as applicable to home intracavernosal injection programs. Including sex therapy in the package might reduce the large drop-out rates currently being seen and might decrease the risk of misuse of these medications. PMID:2916282

  4. Failed total carpometacarpal joint prosthesis of the thumb

    DEFF Research Database (Denmark)

    Hansen, Torben Bæk; Homilius, Morten

    2010-01-01

    Total joint prosthesis in carpometacarpal joint arthritis of the thumb often fails. Loosening of the implant is often treated by resection arthroplasty, and we reviewed 10 patients, mean age 54 years (range 47-63) who were treated by resection arthroplasty after a failed total joint prosthesis. The...... male:female ratio was 1:4 and the mean duration of observation 32 months (range 6-52). In three patients the revised implant was a MOJE uncemented carpometacarpal joint prosthesis and in seven patients an Elektra uncemented one. At follow-up grip strength was reduced to less than 90% of the other hand...... in eight of 10 patients, but the mean Disabilities of the arm, shoulder, and hand (DASH) scores, self-reported pinch-grip-related function, and pain were comparable with our earlier published results with the Elektra carpometacarpal total joint prosthesis....

  5. Retinal Prosthesis: A Potential Benefit for the Blind

    Institute of Scientific and Technical Information of China (English)

    YANG Xiao-jie

    2009-01-01

    Retinal degenerative diseases may induce the degeneration of outer retina and in turn, blindness. Nevertheless, due to the maintenance of inner retina, the coding and processing of visual neurons responses are still able to be executed naturally. Therefore,an effective retinal prosthesis device may be developed by mimicking the function of outer retina: transferring the visual light into artificial stimulus and delivering the stimulus to the retina aiming to evoke the neural responses. As two main developing directions for current retinal prosthesis,epiretinal (ER) and subretinal (SR) prosthesis are both undergoing experimental stage and possessing advantages and limitations. Further investigations in power supply, biocompatibility, etc.are still required. Additionally, suprachoroidal transretinal stimulation (STS) and neurotransmitter-induced stimulation as some other alternatives in retinal prosthesis are also considered as promising research directions, although they are not mature enough to be applied commercially, either.

  6. Design and Control of a Pneumatically Actuated Transtibial Prosthesis

    OpenAIRE

    Zheng, Hao; Shen, Xiangrong

    2015-01-01

    This paper presents the design and control of a pneumatically actuated transtibial prosthesis, which utilizes a pneumatic cylinder-type actuator to power the prosthetic ankle joint to support the user's locomotion. The pneumatic actuator has multiple advantages over the traditional electric motor, such as light weight, low cost, and high power-to-weight ratio. The objective of this work is to develop a compact and lightweight transtibial prosthesis, leveraging the multiple advantages provided...

  7. Ethical issues in the development of a vestibular prosthesis

    OpenAIRE

    Poppendieck, Wigand; Hoffmann, Klaus-Peter; Merfeld, Daniel; Guyot, Jean-Philippe; Micera, Silvestro

    2011-01-01

    During the development of a neural prosthesis, various ethical aspects have to be considered. These range from the basic design of the prosthesis and manufacturing of the various components and the system using biocompatible materials to extensive in vitro and in vivo testing and investigations in the animal model, before taking the final step and going to human trials. As medical systems, neural prostheses have to be proven absolutely safe before considering any clinical study. In this work,...

  8. Nasal Prosthesis Rehabilitation after Partial Rhinectomy: A Clinical Report

    OpenAIRE

    Seçilmiş, Aslı; Öztürk, A. Nilgün

    2007-01-01

    Facial defects resulting from neoplasms, congenital malformations, or trauma can be restorated with facial prostheses using different materials and retention methods to achieve a lifelike look and function. For the successful result, a lot of factors as harmony, texture, color matching, and blending of tissue interface of prosthesis is important. This clinical report describes treatment using a silicone prosthesis with a mechanical - retentined design for a patient who received a partial rhin...

  9. Mastication Improvement After Partial Implant-supported Prosthesis Use

    OpenAIRE

    Gonçalves, T.M.S.V.; Campos, C.H.; Gonçalves, G.M.; Moraes, M; Rodrigues Garcia, R.C.M.

    2013-01-01

    Partially edentulous patients may be rehabilitated by the placement of removable dental prostheses, implant-supported removable dental prostheses, or partial implant fixed dental prostheses. However, it is unclear the impact of each prosthesis type over the masticatory aspects, which represents the objective of this paired clinical trial. Twelve patients sequentially received and used each of these 3 prosthesis types for 2 months, after which maximum bite force was assessed by a strain sensor...

  10. Treatment Using Functionally Fixed Prosthesis: A Case Report

    OpenAIRE

    Chandra, Sumi; Singh, Ajay; Gupta, Himanshu; Chandra, Chetan

    2013-01-01

    Most dental practitioners as well as their patients prefer to have fixed rather than removable prosthesis. However, there are many clinical situations that prohibit the use of the fixed treatment modality. These clinical cases can vary from, simply not having the proper number of healthy teeth and/or implants to, the esthetically challenging cases of high smile lines and severe loss of alveolar support. The approach of using a traditional removable prosthesis in these situations has always be...

  11. Improving esthetics of finger prosthesis by glove silicone

    OpenAIRE

    Laxman Singh Kaira; Esha Dabral

    2014-01-01

    Finger and partial finger amputations are some of the most frequently encountered forms of partial hand loss. A high quality esthetic prosthesis with passive function can be helpful to the patient since loss or congenital absence or malformation have both a social and psychological impact on the patient. Prosthetics is an art and science, which provides lifelike appearance to the lost structures of the patient. This case report presents the fabrication of a silicone finger prosthesis, which h...

  12. The specialty of bucomaxillofacial prosthesis and its performance in Dentistry

    OpenAIRE

    Fabiano Geronasso SIMÕES; Ricardo Cesar dos REIS; Reinaldo Brito e Dias

    2009-01-01

    Introduction:The human attempt to restore the bucomaxillofacialregion by heteroplasia is as old as the formation of civilizations. Archaeological excavations have revealed Egyptian mummies with artificial eyes, nose and ears.Objective and literature review:The aim of this study was to report the evolution and importance of bucomaxillofacial prosthesis,which might be the greatest challenge ofdental surgeons within the specialties of Dentistry.Conclusion: Thebucomaxillofacial prosthesis outreac...

  13. Comparison of Titanium vs. Polycel Total Ossicular Replacement Prosthesis

    OpenAIRE

    Faramarzi, Mohammad; Jahangiri, Reza; Roosta, Sareh

    2016-01-01

    Introduction: Even though modern technology progresses so rapidly, annals of otology are replete with so many challenging article, which often compare various types of prosthesis. Since there has not been a prospective randomized clinical trial study which compares the hearing result of total ossicular replacement prosthesis made of Titanium with omega connector and Polycel in the literature, we decided to perform a study encompassing this issue. Materials and Methods: 105 patients, who were ...

  14. TOTAL ANKLE ARTHROPLASTY: BRAZILIAN EXPERIENCE WITH THE HINTEGRA PROSTHESIS

    OpenAIRE

    Nery, Caio; Fernandes, Túlio Diniz; Réssio, Cibele; Fuchs, Mauro Luiz; Godoy Santos, Alexandre Leme de; Ortiz, Rafael Trevisan

    2015-01-01

    Ankle arthrosis is becoming more and more common. The search for solutions that preserve joint function has led to a new generation of prosthesis with three components and more degrees of freedom. This paper presents the results achieved for ten patients treated with the HINTEGRA Prosthesis (Integra, New Deal), through collaborative action between the Foot and Ankle Groups of the Orthopedics and Traumatology divisions of Escola Paulista de Medicina, Unifesp, and the School of Medicine of the ...

  15. Post Reconstruction Breast Pyoderma Gangrenosum: Early Recognition and Prosthesis Salvage

    OpenAIRE

    Cicuto, Bryan; Cheriyan, Thomas; Rudnicki, Pamela; Guo, Lifei

    2015-01-01

    Summary: We report 3 cases of breast pyoderma gangrenosum in patients undergoing total mastectomy with immediate reconstruction. All three received systemic corticosteroid treatment, resulting in resolution of symptoms. As experience grew, early diagnosis in the third patient helped prosthesis salvage and timely return to the original course of reconstruction. This represents the first report of prosthesis salvage from post breast reconstruction pyoderma gangrenosum, and it demonstrates that ...

  16. Kinematic Analysis of a Posterior-stabilized Knee Prosthesis

    Institute of Scientific and Technical Information of China (English)

    Zhi-Xin Zhao; Liang Wen; Tie-Bing Qu; Li-Li Hou; Dong Xiang; Jia Bin

    2015-01-01

    Background:The goal of total knee arthroplasty (TKA) is to restore knee kinematics.Knee prosthesis design plays a very important role in successful restoration.Here,kinematics models of normal and prosthetic knees were created and validated using previously published data.Methods:Computed tomography and magnetic resonance imaging scans of a healthy,anticorrosive female cadaver were used to establish a model of the entire lower limbs,including the femur,tibia,patella,fibula,distal femur cartilage,and medial and lateral menisci,as well as the anterior cruciate,posterior cruciate,medial collateral,and lateral collateral ligaments.The data from the three-dimensional models of the normal knee joint and a posterior-stabilized (PS) knee prosthesis were imported into finite element analysis software to create the final kinematic model of the TKA prosthesis,which was then validated by comparison with a previous study.The displacement of the medial/lateral femur and the internal rotation angle of the tibia were analyzed during 0-135° flexion.Results:Both the output data trends and the measured values derived from the normal knee's kinematics model were very close to the results reported in a previous in vivo study,suggesting that this model can be used for further analyses.The PS knee prosthesis underwent an abnormal forward displacement compared with the normal knee and has insufficient,or insufficiently aggressive,"rollback" compared with the lateral femur of the normal knee.In addition,a certain degree of reverse rotation occurs during flexion of the PS knee prosthesis.Conclusions:There were still several differences between the kinematics of the PS knee prosthesis and a normal knee,suggesting room for improving the design of the PS knee prosthesis.The abnormal kinematics during early flexion shows that the design of the articular surface played a vital role in improving the kinematics of the PS knee prosthesis.

  17. Literature Review on Needs of Upper Limb Prosthesis Users

    OpenAIRE

    Cordella, Francesca; Ciancio, Anna Lisa; Sacchetti, Rinaldo; Davalli, Angelo; Cutti, Andrea Giovanni; Guglielmelli, Eugenio; Zollo, Loredana

    2016-01-01

    The loss of one hand can significantly affect the level of autonomy and the capability of performing daily living, working and social activities. The current prosthetic solutions contribute in a poor way to overcome these problems due to limitations in the interfaces adopted for controlling the prosthesis and to the lack of force or tactile feedback, thus limiting hand grasp capabilities. This paper presents a literature review on needs analysis of upper limb prosthesis users, and points out ...

  18. Kinematic Analysis of a Posterior-stabilized Knee Prosthesis

    Directory of Open Access Journals (Sweden)

    Zhi-Xin Zhao

    2015-01-01

    Full Text Available Background: The goal of total knee arthroplasty (TKA is to restore knee kinematics. Knee prosthesis design plays a very important role in successful restoration. Here, kinematics models of normal and prosthetic knees were created and validated using previously published data. Methods: Computed tomography and magnetic resonance imaging scans of a healthy, anticorrosive female cadaver were used to establish a model of the entire lower limbs, including the femur, tibia, patella, fibula, distal femur cartilage, and medial and lateral menisci, as well as the anterior cruciate, posterior cruciate, medial collateral, and lateral collateral ligaments. The data from the three-dimensional models of the normal knee joint and a posterior-stabilized (PS knee prosthesis were imported into finite element analysis software to create the final kinematic model of the TKA prosthesis, which was then validated by comparison with a previous study. The displacement of the medial/lateral femur and the internal rotation angle of the tibia were analyzed during 0-135° flexion. Results: Both the output data trends and the measured values derived from the normal knee′s kinematics model were very close to the results reported in a previous in vivo study, suggesting that this model can be used for further analyses. The PS knee prosthesis underwent an abnormal forward displacement compared with the normal knee and has insufficient, or insufficiently aggressive, "rollback" compared with the lateral femur of the normal knee. In addition, a certain degree of reverse rotation occurs during flexion of the PS knee prosthesis. Conclusions: There were still several differences between the kinematics of the PS knee prosthesis and a normal knee, suggesting room for improving the design of the PS knee prosthesis. The abnormal kinematics during early flexion shows that the design of the articular surface played a vital role in improving the kinematics of the PS knee prosthesis.

  19. Visual prosthesis wireless energy transfer system optimal modeling

    OpenAIRE

    Li, Xueping; Yang, Yuan; Gao, Yong

    2014-01-01

    Background Wireless energy transfer system is an effective way to solve the visual prosthesis energy supply problems, theoretical modeling of the system is the prerequisite to do optimal energy transfer system design. Methods On the basis of the ideal model of the wireless energy transfer system, according to visual prosthesis application condition, the system modeling is optimized. During the optimal modeling, taking planar spiral coils as the coupling devices between energy transmitter and ...

  20. Clinical and functional outcomes of the saddle prosthesis

    OpenAIRE

    Donati, D.; D’Apote, G.; M. Boschi; Cevolani, L.; M.G. Benedetti

    2012-01-01

    Background The implantation of a saddle prosthesis after resection of a pelvic tumor has been proposed as a simple method of reconstruction that provides good stability and reduces the surgical time, thus limits the onset of intraoperative complications. There are no studies in the literature of patients evaluated using gait analysis after being implanted with a saddle prosthesis. The present study is a retrospective case review aimed at illustrating long-term clinical and functional findings...

  1. Design and Optimization of Sinusoidal Formed Femur Prosthesis

    Directory of Open Access Journals (Sweden)

    Ahmet Zafer ŞENALP

    2015-01-01

    Full Text Available One of the major problems in hip replacement surgery is the hip replacement loosening. Hip replacement loosening occurs over time after the surgery and it is related to the discretization between the bone cement and prosthesis. The underlying factors of this situation are the stress occurring in the bone cement and the shape of the prosthesis. In this study, cortical and trabecular layers of the femur, bone cement and prosthesis were modeled. The models of bone cement and prosthesis were constructed parametrically and two different sinusoidal formed prostheses were developed unlike the former prostheses shapes. Analyses were conducted for these two different sinusoidal forms by using finite element method and optimization was conducted to obtain the appropriate prosthesis stem shape and bone cement thickness by using parametric modeling in finite element analyses. For finite element analyses and optimization, Ansys Workbench software was used and analyses were conducted for 316LS stainless steel material. Finally, the optimum prosthesis stem shape and bone cement thickness was determined by using the results of the analyses in the first stage

  2. Stress analysis of different prosthesis materials in implant-supported fixed dental prosthesis using 3D finite element method

    OpenAIRE

    Pedram Iranmanesh; Alireza Abedian; Naeimeh Nasri; Ehsan Ghasemi; Saber Khazaei

    2014-01-01

    Introduction: In the present study, the finite element method (FEM) was used to investigate the effects of prosthesis material types on stress distribution of the bone surrounding implants and to evaluate stress distribution in three-unit implant-supported fixed dental prosthesis (FDP). Materials and Methods: A three-dimensional (3D) finite element FDP model of the maxillary second premolar to the second molar was designed. Three load conditions were statically applied on the functional cusps...

  3. Muscular activity when walking in a non-anthropomorphic wearable robot.

    Science.gov (United States)

    Tagliamonte, N L; Accoto, D; Sergi, F; Sudano, A; Formica, D; Guglielmelli, E

    2014-01-01

    Wearable robots should be designed not to alter human physiological motion. Perturbations introduced by a robot can be quantified by measuring EMG activity. This paper presents tests on the LENAR, an intrinsically back-drivable non-anthropomorphic lower limb wearable robot designed to provide hip and knee flexion/extension assistance. In previous works the robot was demonstrated to exhibit low mechanical impedance and to introduce minor alterations to human kinematic patterns during walking. In this paper muscular activity is assessed, demonstrating small alterations in the EMG patterns during the interaction with the robot, in both unpowered and assistive mode. PMID:25570640

  4. Modeling and control of an antagonistically actuated tendon driven anthropomorphic hand

    OpenAIRE

    Chalon, Maxime

    2013-01-01

    One of the major limitations of object manipulation with a robotic hand is the fragility of the hardware.This is one of the motivations for developing the new anthropomorphic and extremely robust Hand Arm System at the robotics and mecatronics center of DLR.The system is unique in terms of complexity, with 52 motors and more than 200 sensors, and also in terms of dynamics.Indeed, the system is mechanically compliant, thus offers the possibility to store and release energy, thereby providing t...

  5. Tomographic anthropomorphic models. Pt. 4. Organ doses for adults due to idealized external photon exposures

    International Nuclear Information System (INIS)

    The present report contains extensive tables and figures of conversion coefficients of organ and tissue equivalent dose, normalised to air kerma free in air for voxel anthropomorphic phantoms and for standard geometries of external photon radiation, estimated with Monte Carlo techniques. Four realistic adult voxel phantoms were used for the calculations, based on computed tomographic data of real people: three male phantoms, two of them being of average size, one representing a big man, and one female phantom of a tall and somewhat over weighted woman. (orig.)

  6. Evaluation of an anthropomorphic male pelvic phantom for image-guided radiotherapy

    OpenAIRE

    Pang, Geordi

    2009-01-01

    B Schaly1, V Varchena2, P Au3, G Pang3,41Grand River Regional Cancer Centre, Kitchener, ON, Canada; 2CIRS Inc., Norfolk, VA, USA; 3Odette Cancer Centre, Toronto, ON, Canada; 4Departments of Radiation Oncology and Medical Biophysics, University of Toronto, Toronto, ON, Canada Abstract: Soft-tissue imaging in the treatment room is one of the main challenges faced today in high precision radiotherapy. The objective of this work is to evaluate a new anthropomorphic male pelvic phantom (C...

  7. Tomographic anthropomorphic models. Pt. 4. Organ doses for adults due to idealized external photon exposures

    CERN Document Server

    Zankl, M; Petoussi-Henss, N; Regulla, D

    2002-01-01

    The present report contains extensive tables and figures of conversion coefficients of organ and tissue equivalent dose, normalised to air kerma free in air for voxel anthropomorphic phantoms and for standard geometries of external photon radiation, estimated with Monte Carlo techniques. Four realistic adult voxel phantoms were used for the calculations, based on computed tomographic data of real people: three male phantoms, two of them being of average size, one representing a big man, and one female phantom of a tall and somewhat over weighted woman.

  8. Characterization of MOSFET dosimeters for low-dose measurements in maxillofacial anthropomorphic phantoms.

    Science.gov (United States)

    Koivisto, Juha H; Wolff, Jan E; Kiljunen, Timo; Schulze, Dirk; Kortesniemi, Mika

    2015-01-01

    The aims of this study were to characterize reinforced metal-oxide-semiconductor field-effect transistor (MOSFET) dosimeters to assess the measurement uncertainty, single exposure low-dose limit with acceptable accuracy, and the number of exposures required to attain the corresponding limit of the thermoluminescent dosimeters (TLD). The second aim was to characterize MOSFET dosimeter sensitivities for two dental photon energy ranges, dose dependency, dose rate dependency, and accumulated dose dependency. A further aim was to compare the performance of MOSFETs with those of TLDs in an anthropomorphic phantom head using a dentomaxillofacial CBCT device. The uncertainty was assessed by exposing 20 MOSFETs and a Barracuda MPD reference dosimeter. The MOSFET dosimeter sensitivities were evaluated for two photon energy ranges (50-90 kVp) using a constant dose and polymethylmethacrylate backscatter material. MOSFET and TLD comparative point-dose measurements were performed on an anthropomorphic phantom that was exposed with a clinical CBCT protocol. The MOSFET single exposure low dose limit (25% uncertainty, k = 2) was 1.69 mGy. An averaging of eight MOSFET exposures was required to attain the corresponding TLD (0.3 mGy) low-dose limit. The sensitivity was 3.09 ± 0.13 mV/mGy independently of the photon energy used. The MOSFET dosimeters did not present dose or dose rate sensitivity but, however, presented a 1% decrease of sensitivity per 1000 mV for accumulated threshold voltages between 8300 mV and 17500 mV. The point doses in an anthropomorphic phantom ranged for MOSFETs between 0.24 mGy and 2.29 mGy and for TLDs between 0.25 and 2.09 mGy, respectively. The mean difference was -8%. The MOSFET dosimeters presented statistically insignificant energy dependency. By averaging multiple exposures, the MOSFET dosimeters can achieve a TLD-comparable low-dose limit and constitute a feasible method for diagnostic dosimetry using anthropomorphic phantoms. However, for single in

  9. Automated estimation of hip prosthesis migration: a feasibility study

    Science.gov (United States)

    Vandemeulebroucke, Jef; Deklerck, Rudi; Temmermans, Frederik; Van Gompel, Gert; Buls, Nico; Scheerlinck, Thierry; de Mey, Johan

    2013-09-01

    A common complication associated with hip arthoplasty is prosthesis migration, and for most cemented components a migration greater than 0.85 mm within the first six months after surgery, are an indicator for prosthesis failure. Currently, prosthesis migration is evaluated using X-ray images, which can only reliably estimate migrations larger than 5 mm. We propose an automated method for estimating prosthesis migration more accurately, using CT images and image registration techniques. We report on the results obtained using an experimental set-up, in which a metal prosthesis can be translated and rotated with respect to a cadaver femur, over distances and angles applied using a combination of positioning stages. Images are first preprocessed to reduce artefacts. Bone and prosthesis are extracted using consecutive thresholding and morphological operations. Two registrations are performed, one aligning the bones and the other aligning the prostheses. The migration is estimated as the difference between the found transformations. We use a robust, multi-resolution, stochastic optimization approach, and compare the mean squared intensity differences (MS) to mutual information (MI). 30 high-resolution helical CT scans were acquired for prosthesis translations ranging from 0.05 mm to 4 mm, and rotations ranging from 0.3° to 3° . For the translations, the mean 3D registration error was found to be 0.22 mm for MS, and 0.15 mm for MI. For the rotations, the standard deviation of the estimation error was 0.18° for MS, and 0.08° for MI. The results show that the proposed approach is feasible and that clinically acceptable accuracies can be obtained. Clinical validation studies on patient images will now be undertaken.

  10. Comparative study on percutaneous coronary intervention of unprotected left main coronary artery disease: transradial versus transfemoral approach

    Directory of Open Access Journals (Sweden)

    Quan-min JING

    2011-11-01

    Full Text Available Objective To compare the safety,feasibility,and clinical efficacy of transradial approach(TRA percutaneous coronary intervention(PCI with transfemoral approach(TFA PCI for unprotected left main coronary artery(ULMCA disease.Methods The current study selected 286 patients who underwent PCI for ULMCA lesions in the General Hospital of Shenyang Military Region between Jan.2007 and Dec.2008,which included 144(TRA group patients with TRA PCI and 142(TFA group with TFA PCI for review analysis.Difference in coronary angiography(CAG,operation success rate,implantation of complex bifurcate lesion stent,X-ray exposure period,contrast agent dosage,local vascular complications,major adverse cardiac events(MACE rate during hospitalization and visiting period,post-PCI ambulation,post-PCI hospitalization period,and the total hospitalization period between the two groups were compared.Results The two groups have similar baseline features.The difference between the TRA and TFA groups in CAG and operation success rate(96.5% and 98.6% for TRA and 92.3% and 97.9% for TFA,respectively has no statistical significance(P=0.116,P=0.641.The difference between the TRA and TFA groups in terms of implantation rate(29.9% vs 26.8% of complex bifurcate lesion stent(crushed,culotte,T stent,exposure period(53.1min±10.42min vs 51.23min±9.80min,and contrast agent dosage(247.66ml±106.98ml vs 267.26ml±136.09ml has no statistical significance(P=0.561,P=0.105,P=0.175.The TRA group has lower local vascular complications(10.4% vs 19.7% than the TFA group(P=0.028.MACE during hospitalization in the TRA group(6.3% is lower than that in the TFA group(12.7%,but the difference has no statistical significance(P=0.066.Neither group has post-PCI myocardial infarction,stroke,or emergency coronary artery bypass grafting.The TRA group has shorter(P < 0.001 post-PCI ambulation period(1.37days±0.62days vs 2.40days±1.45days,post-PCI hospitalization period(4.16days±3.19days vs 7.75days±5.29days

  11. Anthropomorphic measurements

    International Nuclear Information System (INIS)

    Based on decisions taken during the Research Coordination Meetings in Mito City 1988 and Bombay 1991, the participants were requested to provide data on physical measurement parameters of body height, body weight, sitting height, head circumference, neck circumference, chest circumference, chest width and chest depth which represented the age groups as newborn, 1 year, 5 years, 10 years, 15 years and adult 20-50 years. Accordingly, physical measurement data was obtained by participants from 9 countries

  12. Intraoral framework pick-up technique to improve fit of a metal-resin implant prosthesis

    Directory of Open Access Journals (Sweden)

    Mirza Rustum Baig

    2012-01-01

    Full Text Available The achievement of passive fit is an important prerequisite for the prevention of complications in full-arch screw-retained implant prosthesis. With cemented prosthesis, the cementation compensates for the discrepancies in the cast framework, but the lack of retrievability seems undesirable. The aim of this paper is to propose a modified screw-retained prosthesis design for complete arch implant fixed rehabilitation. A technique for the fabrication of a full-arch metal-resin implant-supported screw-retained prosthesis is described. Cementation of the framework to the abutments intraorally improves the passivity of fit of the prosthesis on the implants. Maintenance of screw-access channels in the final prosthesis ensures retrievability. The metal-resin design allows for easy repair and maintenance. The prosthesis is cost-effective compared to conventional options and can be employed as a viable treatment alternative when considering metal-acrylic resin complete arch fixed prosthesis.

  13. Analysis of translational errors in frame-based and frameless cranial radiosurgery using an anthropomorphic phantom

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Taynna Vernalha Rocha [Faculdades Pequeno Principe (FPP), Curitiba, PR (Brazil); Cordova Junior, Arno Lotar; Almeida, Cristiane Maria; Piedade, Pedro Argolo; Silva, Cintia Mara da, E-mail: taynnavra@gmail.com [Centro de Radioterapia Sao Sebastiao, Florianopolis, SC (Brazil); Brincas, Gabriela R. Baseggio [Centro de Diagnostico Medico Imagem, Florianopolis, SC (Brazil); Marins, Priscila; Soboll, Danyel Scheidegger [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil)

    2016-03-15

    Objective: To evaluate three-dimensional translational setup errors and residual errors in image-guided radiosurgery, comparing frameless and frame-based techniques, using an anthropomorphic phantom. Materials and Methods: We initially used specific phantoms for the calibration and quality control of the image-guided system. For the hidden target test, we used an Alderson Radiation Therapy (ART)-210 anthropomorphic head phantom, into which we inserted four 5- mm metal balls to simulate target treatment volumes. Computed tomography images were the taken with the head phantom properly positioned for frameless and frame-based radiosurgery. Results: For the frameless technique, the mean error magnitude was 0.22 ± 0.04 mm for setup errors and 0.14 ± 0.02 mm for residual errors, the combined uncertainty being 0.28 mm and 0.16 mm, respectively. For the frame-based technique, the mean error magnitude was 0.73 ± 0.14 mm for setup errors and 0.31 ± 0.04 mm for residual errors, the combined uncertainty being 1.15 mm and 0.63 mm, respectively. Conclusion: The mean values, standard deviations, and combined uncertainties showed no evidence of a significant differences between the two techniques when the head phantom ART-210 was used. (author)

  14. Analysis of translational errors in frame-based and frameless cranial radiosurgery using an anthropomorphic phantom*

    Science.gov (United States)

    Almeida, Taynná Vernalha Rocha; Cordova Junior, Arno Lotar; Piedade, Pedro Argolo; da Silva, Cintia Mara; Marins, Priscila; Almeida, Cristiane Maria; Brincas, Gabriela R. Baseggio; Soboll, Danyel Scheidegger

    2016-01-01

    Objective To evaluate three-dimensional translational setup errors and residual errors in image-guided radiosurgery, comparing frameless and frame-based techniques, using an anthropomorphic phantom. Materials and Methods We initially used specific phantoms for the calibration and quality control of the image-guided system. For the hidden target test, we used an Alderson Radiation Therapy (ART)-210 anthropomorphic head phantom, into which we inserted four 5mm metal balls to simulate target treatment volumes. Computed tomography images were the taken with the head phantom properly positioned for frameless and frame-based radiosurgery. Results For the frameless technique, the mean error magnitude was 0.22 ± 0.04 mm for setup errors and 0.14 ± 0.02 mm for residual errors, the combined uncertainty being 0.28 mm and 0.16 mm, respectively. For the frame-based technique, the mean error magnitude was 0.73 ± 0.14 mm for setup errors and 0.31 ± 0.04 mm for residual errors, the combined uncertainty being 1.15 mm and 0.63 mm, respectively. Conclusion The mean values, standard deviations, and combined uncertainties showed no evidence of a significant differences between the two techniques when the head phantom ART-210 was used. PMID:27141132

  15. A second generation of physical anthropomorphic 3D breast phantoms based on human subject data

    Science.gov (United States)

    Nolte, Adam; Kiarashi, Nooshin; Samei, Ehsan; Segars, W. P.; Lo, Joseph Y.

    2014-03-01

    Previous fabrication of anthropomorphic breast phantoms has demonstrated their viability as a model for 2D (mammography) and 3D (tomosynthesis) breast imaging systems. Further development of these models will be essential for the evaluation of breast x-ray systems. There is also the potential to use them as the ground truth in virtual clinical trials. The first generation of phantoms was segmented from human subject dedicated breast computed tomography data and fabricated into physical models using highresolution 3D printing. Two variations were made. The first was a multi-material model (doublet) printed with two photopolymers to represent glandular and adipose tissues with the greatest physical contrast available, mimicking 75% and 35% glandular tissue. The second model was printed with a single 75% glandular equivalent photopolymer (singlet) to represent glandular tissue, which can be filled independently with an adipose-equivalent material such as oil. For this study, we have focused on improving the latter, the singlet phantom. First, the temporary oil filler has been replaced with a permanent adipose-equivalent urethane-based polymer. This offers more realistic contrast as compared to the multi-material approach at the expense of air bubbles and pockets that form during the filling process. Second, microcalcification clusters have been included in the singlet model via crushed eggshells, which have very similar chemical composition to calcifications in vivo. The results from these new prototypes demonstrate significant improvement over the first generation of anthropomorphic physical phantoms.

  16. In good company? Perception of movement synchrony of a non-anthropomorphic robot.

    Science.gov (United States)

    Lehmann, Hagen; Saez-Pons, Joan; Syrdal, Dag Sverre; Dautenhahn, Kerstin

    2015-01-01

    Recent technological developments like cheap sensors and the decreasing costs of computational power have brought the possibility of robotic home companions within reach. In order to be accepted it is vital for these robots to be able to participate meaningfully in social interactions with their users and to make them feel comfortable during these interactions. In this study we investigated how people respond to a situation where a companion robot is watching its user. Specifically, we tested the effect of robotic behaviours that are synchronised with the actions of a human. We evaluated the effects of these behaviours on the robot's likeability and perceived intelligence using an online video survey. The robot used was Care-O-bot3, a non-anthropomorphic robot with a limited range of expressive motions. We found that even minimal, positively synchronised movements during an object-oriented task were interpreted by participants as engagement and created a positive disposition towards the robot. However, even negatively synchronised movements of the robot led to more positive perceptions of the robot, as compared to a robot that does not move at all. The results emphasise a) the powerful role that robot movements in general can have on participants' perception of the robot, and b) that synchronisation of body movements can be a powerful means to enhance the positive attitude towards a non-anthropomorphic robot. PMID:26001025

  17. Evaluation of an anthropomorphic male pelvic phantom for image-guided radiotherapy

    Directory of Open Access Journals (Sweden)

    B Schaly

    2009-07-01

    Full Text Available B Schaly1, V Varchena2, P Au3, G Pang3,41Grand River Regional Cancer Centre, Kitchener, ON, Canada; 2CIRS Inc., Norfolk, VA, USA; 3Odette Cancer Centre, Toronto, ON, Canada; 4Departments of Radiation Oncology and Medical Biophysics, University of Toronto, Toronto, ON, Canada Abstract: Soft-tissue imaging in the treatment room is one of the main challenges faced today in high precision radiotherapy. The objective of this work is to evaluate a new anthropomorphic male pelvic phantom (CIRS Inc., Norfolk, VA, USA that can be used in a radiotherapy department to assess the ability of an X-ray imaging system for imaging soft-tissue targets in the treatment room. To this end, we evaluated the tissue-equivalency of the phantom materials in terms of the linear attenuation and energy absorption coefficients. X-ray computed tomography (CT images of the phantom were also obtained and compared with that of patients. Our results demonstrated that the male pelvic phantom is a good representation of actual prostate cancer patients and can be a valuable tool for image-guided radiotherapy. Keywords: image-guided radiotherapy, X-ray imaging, anthropomorphic phantomPACS numbers: 87.56.Fc, 87.59.bd, 87.85.Lf

  18. In good company? Perception of movement synchrony of a non-anthropomorphic robot.

    Directory of Open Access Journals (Sweden)

    Hagen Lehmann

    Full Text Available Recent technological developments like cheap sensors and the decreasing costs of computational power have brought the possibility of robotic home companions within reach. In order to be accepted it is vital for these robots to be able to participate meaningfully in social interactions with their users and to make them feel comfortable during these interactions. In this study we investigated how people respond to a situation where a companion robot is watching its user. Specifically, we tested the effect of robotic behaviours that are synchronised with the actions of a human. We evaluated the effects of these behaviours on the robot's likeability and perceived intelligence using an online video survey. The robot used was Care-O-bot3, a non-anthropomorphic robot with a limited range of expressive motions. We found that even minimal, positively synchronised movements during an object-oriented task were interpreted by participants as engagement and created a positive disposition towards the robot. However, even negatively synchronised movements of the robot led to more positive perceptions of the robot, as compared to a robot that does not move at all. The results emphasise a the powerful role that robot movements in general can have on participants' perception of the robot, and b that synchronisation of body movements can be a powerful means to enhance the positive attitude towards a non-anthropomorphic robot.

  19. Analysis of translational errors in frame-based and frameless cranial radiosurgery using an anthropomorphic phantom

    International Nuclear Information System (INIS)

    Objective: To evaluate three-dimensional translational setup errors and residual errors in image-guided radiosurgery, comparing frameless and frame-based techniques, using an anthropomorphic phantom. Materials and Methods: We initially used specific phantoms for the calibration and quality control of the image-guided system. For the hidden target test, we used an Alderson Radiation Therapy (ART)-210 anthropomorphic head phantom, into which we inserted four 5- mm metal balls to simulate target treatment volumes. Computed tomography images were the taken with the head phantom properly positioned for frameless and frame-based radiosurgery. Results: For the frameless technique, the mean error magnitude was 0.22 ± 0.04 mm for setup errors and 0.14 ± 0.02 mm for residual errors, the combined uncertainty being 0.28 mm and 0.16 mm, respectively. For the frame-based technique, the mean error magnitude was 0.73 ± 0.14 mm for setup errors and 0.31 ± 0.04 mm for residual errors, the combined uncertainty being 1.15 mm and 0.63 mm, respectively. Conclusion: The mean values, standard deviations, and combined uncertainties showed no evidence of a significant differences between the two techniques when the head phantom ART-210 was used. (author)

  20. Development of an anthropomorphic thorax phantom for image quality control measurements in diagnostic radiology

    International Nuclear Information System (INIS)

    The use of the ionizing radiation brought by countless benefits to man. But they are associated to the current damages of radiation interaction with the body. Quality control programs of the diagnostic radiology equipment are based in the prevalence of the benefits above the damages. This program determines that tests should be done to guarantee the quality of the medical images, reducing the patients and workers absorbed doses and the cost. However, those tests cannot be made in people and it is on this moment that phantoms are used. Diagnostic radiology phantoms can be of several types, going from simple boxes to the exact representation in the human body, called anthropomorphic phantom. The aim of this study was to develop an anthropomorphic thorax phantom to be used in tests for image quality control measurements in diagnostic radiology and also for professionals' training for analysis of radiologic images. This simulator was made with natural human skeleton, heart and lungs, besides the thorax soft tissue were simulated using epoxy-resin tissue and a pair of lungs was made of foamed-polyurethane. (author)

  1. The anthropomorphic design and experiments of HIT/DLR five-fingered dexterous hand

    Institute of Scientific and Technical Information of China (English)

    Fan Shaowei; Liu Yiwei; Jin Minghe; Lan Tian; Liu Hong

    2009-01-01

    This paper presents a new developed anthropomorphic robot dexterous hand: HIT/DLR Hand II. The hand is composed of an independent palm and five identical modular fingers, and each finger has three degree of freedom (DOFs) and four joints. All the actuators and electronics are integrated in the finger body and the palm. Owing to using a new actuator, drivers and a novel arrangement, both the length and width of the finger is about two third of its former version. By using the wire coupling mechanism, the distal phalanx transmission ratio is kept exactly 1:1 in the whole movement range. The packing mechanism which is implemented directly in the finger body and palm not only reduces the size of whole hand but also make it more anthropomorphic. Additionally, the new designed force/torque and position sensors are integrated in the hand for increasing multisensory capability. To evaluate the performances of the finger mechanism, the position and impedance control experiments are conducted.

  2. Metabolic Prosthesis for Oxygenation of Ischemic Tissue

    Energy Technology Data Exchange (ETDEWEB)

    Greenbaum, Elias [ORNL

    2009-01-01

    This communication discloses new ideas and preliminary results on the development of a "metabolic prosthesis" for local oxygenation of ischemic tissue under physiological neutral conditions. We report for the first time the selective electrolysis of physiological saline by repetitively pulsed charge-limited electrolysis for the production of oxygen and suppression of free chlorine. For example, using 800 A amplitude current pulses and <200 sec pulse durations, we demonstrated prompt oxygen production and delayed chlorine production at the surface of a shiny 0.85 mm diameter spherical platinum electrode. The data, interpreted in terms of the ionic structure of the electric double layer, suggest a strategy for in situ production of metabolic oxygen via a new class of "smart" prosthetic implants for dealing with ischemic disease such as diabetic retinopathy. We also present data indicating that drift of the local pH of the oxygenated environment can be held constant using a feedback-controlled three electrode electrolysis system that chooses anode and cathode pair based on pH data provided by local microsensors. The work is discussed in the context of diabetic retinopathy since surgical techniques for multielectrode prosthetic implants aimed at retinal degenerative diseases have been developed.

  3. Rehabilitation of orbital defect with silicone orbital prosthesis retained by dental implants

    OpenAIRE

    Satyabodh Shesharaj Guttal; Jhanvi Desai; Adarsh Kudva; Patil, Basavaraj R.

    2016-01-01

    Orbital defects can result from cancer, birth anomalies, or trauma leading to an onslaught of problems in the function and psyche of the patient. These defects are restored by surgical reconstruction and followed by placement of orbital prosthesis for cosmetic makeup. The use of dental implants in retaining orbital prosthesis improves patient acceptance of the prosthesis owing to better retention and stability than conventional adhesive retained prosthesis. This case report describes a custom...

  4. An Alternative Approach to Combine Orbital Prosthesis and Obturator: A Case Report

    OpenAIRE

    Soganci, Gokce; Yalug, Suat; Kocacikli, Mustafa

    2011-01-01

    This report describes a different approach for diminishing the movements of orbital prosthesis during mimic movements and chewing function. Mechanical devices such as magnets are used to enhance the retention in case lack of the implants. However rigid fixation of obturator and orbital prosthesis can result in movements of the orbital prosthesis during mastication. In this case obturator and orbital prosthesis are combined by magnets. However this combination is not rigid because of an active...

  5. Maxillary cement retained implant supported monolithic zirconia prosthesis in a full mouth rehabilitation: a clinical report

    OpenAIRE

    Sadid-Zadeh, Ramtin; Liu, Perng-Ru; Aponte-Wesson, Ruth; O'Neal, Sandra J

    2013-01-01

    This clinical report presents the reconstruction of a maxillary arch with a cement retained implant supported fixed prosthesis using a monolithic zirconia generated by CAD/CAM system on eight osseointegrated implants. The prosthesis was copy milled from an interim prosthesis minimizing occlusal adjustments on the definitive prosthesis at the time of delivery. Monolithic zirconia provides high esthetics and reduces the number of metal alloys used in the oral cavity.

  6. Fracture of Both Rods of a Malleable Penile Prosthesis: A Case Report

    OpenAIRE

    Berat Ozgur

    2013-01-01

    Only a few cases with mechanical failure has been reported with the malleable penile prosthesis. A 66 year old man, using the AMS 650® (American Medical Systems, Minnesota) malleable penile prosthesis for five years, was admitted with complaining a difficulty in sexual intercourse in the last weeks. Preoperative radiology and surgical exploration demonstrated a fracture in both rods. The malfunctioning penile prosthesis was removed, and a new AMS 650® malleable penile prosthesis was i...

  7. Clinical predictors of prosthesis-patient mismatch after aortic valve replacement for aortic stenosis

    OpenAIRE

    Luis M Astudillo; Orlando Santana; Urbandt, Pablo A.; Benjo, Alexandre M.; Lior U Elkayam; Nascimento, Francisco O.; Lamas, Gervasio A.; Joseph Lamelas

    2012-01-01

    OBJECTIVE: We sought to ascertain predictors of Patient Prosthesis Mismatch, an independent predictor of mortality, in patients with aortic stenosis using bioprosthetic valves. METHOD: We analyzed 2,107 sequential surgeries. Patient Prosthesis Mismatch was calculated using the effective orifice area of the prosthesis divided by the patient's body surface area. We defined nonsignificant, moderate, and severe Patient Prosthesis Mismatch as effective orifice area indexes of >0.85 cm2/m, 0.85-0.6...

  8. Isolated pump erosion of an inflatable penile prosthesis through the scrotum in a diabetic patient

    OpenAIRE

    Raidh A. Talib; Ahmad Shamsodini; Salem, Emad A.; Onder Canguven; Abdulla Al Ansari

    2013-01-01

    Isolated pump erosion is a rare complication in patients with inflatable penile prosthesis. We describe a case of a diabetic patient who underwent inflatable penile prosthesis implantation with subsequent isolated pump erosion. Repeated attempts of conservative repair of the erosion failed. Finally, the inflatable penile prosthesis was replaced with a malleable one to avoid new pump erosion. In case of isolated pump erosion, replacement of the inflatable penile prosthesis with a malleable one...

  9. Outcome of total knee arthroplasty with insall burstein-11 prosthesis

    International Nuclear Information System (INIS)

    Patients with severe degenerative knee joint disease often require knee arthroplasty to reduce pain, improve stability and restore function. Insall Burstein II prosthesis is posteriorly stabilized condylar prosthesis, which provide posterior cruciate ligament substitution. It was designed to improve range of motion, stair climbing ability and to prevent posterior subluxation. Evaluate the functional outcome of total knee arthroplasty with IB II prosthesis and Evaluate the alignment of prosthetic components by radiological parameters and its correlation with functional outcome. Sixty knees of sixty patients were replaced by using Insall Burstein II prosthesis. Postoperative radiographs were evaluated for alignment of knee and prosthetic components by criteria selected from knee society roentogenographic evaluation system. Functional outcome was evaluated by rationale of knee society knee rating system. Prosthetic component was aligned in 93% and mal-alignment in 7% of the cases. There was significant improvement in functions core from mean score 33.83 +-15.5 to 59.5+-17.7 and knee score from 37 +- 12.5 to 76.4 +-2.2. Postoperative functional score was found correlated with alignment significantly. Conclusion: Total knee arthroplasty with I-B-II prosthesis is a safe durable and predictable procedure with proper surgical technique and expertise good alignment and satisfactory functional out come can be achieved. (author)

  10. Design and Testing of a Bionic Dancing Prosthesis.

    Science.gov (United States)

    Rouse, Elliott J; Villagaray-Carski, Nathan C; Emerson, Robert W; Herr, Hugh M

    2015-01-01

    Traditionally, prosthetic leg research has focused on improving mobility for activities of daily living. Artistic expression such as dance, however, is not a common research topic and consequently prosthetic technology for dance has been severely limited for the disabled. This work focuses on investigating the ankle joint kinetics and kinematics during a Latin-American dance to provide unique motor options for disabled individuals beyond those of daily living. The objective of this study was to develop a control system for a bionic ankle prosthesis that outperforms conventional prostheses when dancing the rumba. The biomechanics of the ankle joint of a non-amputee, professional dancer were acquired for the development of the bionic control system. Subsequently, a professional dancer who received a traumatic transtibial amputation in April 2013 tested the bionic dance prosthesis and a conventional, passive prosthesis for comparison. The ability to provide similar torque-angle behavior of the biological ankle was assessed to quantify the biological realism of the prostheses. The bionic dancing prosthesis overlapped with 37 ± 6% of the non-amputee ankle torque and ankle angle data, compared to 26 ± 2% for the conventional, passive prosthesis, a statistically greater overlap (p = 0.01). This study lays the foundation for quantifying unique, expressive activity modes currently unavailable to individuals with disabilities. Future work will focus on an expansion of the methods and types of dance investigated in this work. PMID:26285201

  11. A new tracheal prosthesis made from collagen grafted mesh.

    Science.gov (United States)

    Okumura, N; Nakamura, T; Takimoto, Y; Natsume, T; Teramachi, M; Tomihata, K; Ikada, Y; Shimizu, Y

    1993-01-01

    The authors studied the efficacy of a new tracheal prosthesis made from mesh. The prosthesis, 50 mm long and 18-22 mm in diameter, is made from a Marlex mesh cylinder reinforced with a continuous polypropylene spiral that is grafted and coated with porcine collagen to increase its biocompatibility and provide an airtight seal during the initial implantation stage. Circumferential surgical resection and replacement of a seven to nine ring segment of the cervical trachea was performed in 20 adult mongrel dogs. At the time of surgery, a silicone tube was inserted into the tracheal prosthetic lumen to promote secretory transportation until the prosthesis was covered with host tissue. The silicone tube was removed during fiber bronchoscopy 1 month after surgery. With the exception of the prostheses in 3 dogs that died of unrelated causes, all were infiltrated by connective tissue and incorporated completely by the host. One of these 17 dogs died of suffocation caused by luminal stenosis 2.5 months after surgery, but the others survived until they were killed at more than 6 months. The luminal surfaces of the reconstructed tracheae were covered with respiratory epithelium to varying degrees, and in one dog killed at 22 months after surgery, confluent epithelization throughout the length of the prosthesis was confirmed histologically. In eight dogs, prosthetic luminal stenosis occurred because of overgrowth of granulation tissue, which generally was mild in all but three dogs. The authors conclude that this tracheal prosthesis is highly biocompatible and shows promise for clinical application. PMID:8268582

  12. [Design and study of carbon fiber tracheal prosthesis].

    Science.gov (United States)

    Qi, L; Liu, D; Han, Z; Wang, F

    1998-12-01

    32 healty adult dogs were selected for this experiment. 10 of them were subjected to the tracheal biomechanics test using indices including the relation between stretcher ratio (lambda) and stress (T), the squeeze stress (delta jy) of medical silk thread on trachea, the side stress (Ts) inducing the tracheal collapse, the functional maximum angle (psi max) of tracheal, and the sever area torsion angle (theta max) of tracheal functional maximum curved. According to the indices measured, two types of tracheal prosthesis were designed, and were made of carbon fiber and silicon. They were the straight tube type tracheal prosthesis and the bifurcate type tracheal prosthesis. The straight tube type tracheal prosthesis was studied with a design of two groups comprising a total of 11 dogs. In the experiment group (n = 6), the outer surface of the tube was not coated with silicon, the average survival period was 379.8 days. In the control group (n = 5), the outer surface of the tube was coated with silicon, the average survival period was 90.4 days. The bifurcate type tracheal prosthesis was studied in 11 dogs, the average survival period was 4.32 days. The main causes of death in the experiment were infection and anastomotic dehiscent. PMID:12552773

  13. Correlation analysis between the interface membrane and loose hip prosthesis

    Institute of Scientific and Technical Information of China (English)

    Jian-bing Ma; Yu-ming Zhang; Xiang-dong Meng; Miao Liu

    2009-01-01

    Objective To analyze the cause of prosthesis loosening by observing the interface membranes harvested during the hip restoration operation. Methods A total of 28 specimens of interface membrane around the loose prosthesis were harvested from 28 patients undergoing the restoration of total hip replacement. All the specimens underwent the observation of appearance, light microscopy and scanning electronic microscopy(SEM). Results All the gaps around the loose prosthesis were filled with interface membrane of different thickness. The color of the most interface membrane was madder red, and the other one third of membrane was black. The comparatively thicker membrane was similar to scar connective tissue while the thinner was similar to fiber membrane. A large number of wear debris, macrophages and foreign-body giant cells were found under light microscope. With SEM observation a large number of different diameter collagen fibra structures that looked like scar tissues were arranged disorderly in a great mass, foreign particles and bone debris of different size were distributed unevenly, and the fibroblast was distributed in the collagen fiber. Conclusion Wear debris is related to inflammatory cell response around the interface membrane of the loose prosthesis. The wear debris engulfed by macrophage stimulates the interface membrane to release bone resorption factors (such as TNF) which lead to osteolysis, and this is one of the most important causes of the prosthesis loosening.

  14. Split-Framework in Mandibular Implant-Supported Prosthesis

    Directory of Open Access Journals (Sweden)

    Danny Omar Mendoza Marin

    2015-01-01

    Full Text Available During oral rehabilitation of an edentulous patient with an implant-supported prosthesis, mandibular flexure must be considered an important biomechanical factor when planning the metal framework design, especially if implants are installed posterior to the interforaminal region. When an edentulous mandible is restored with a fixed implant-supported prosthesis connected by a fixed full-arch framework, mandibular flexure may cause needless stress in the overall restorative system and lead to screw loosening, poor fit of prosthesis, loss of the posterior implant, and patient’s discomfort due to deformation properties of the mandible during functional movements. The use of a split-framework could decrease the stress with a precise and passive fit on the implants and restore a more natural functional condition of the mandible, helping in the longevity of the prosthesis. Therefore, the present clinical report describes the oral rehabilitation of an edentulous patient by a mandibular fixed implant-supported prosthesis with a split-framework to compensate for mandibular flexure. Clinical Significance. The present clinical report shows that the use of a split-framework reduced the risk of loss of the posterior implants or screws loosening with acceptable patient comfort over the period of a year. The split-framework might have compensated for the mandibular flexure during functional activities.

  15. Design and Testing of a Bionic Dancing Prosthesis.

    Directory of Open Access Journals (Sweden)

    Elliott J Rouse

    Full Text Available Traditionally, prosthetic leg research has focused on improving mobility for activities of daily living. Artistic expression such as dance, however, is not a common research topic and consequently prosthetic technology for dance has been severely limited for the disabled. This work focuses on investigating the ankle joint kinetics and kinematics during a Latin-American dance to provide unique motor options for disabled individuals beyond those of daily living. The objective of this study was to develop a control system for a bionic ankle prosthesis that outperforms conventional prostheses when dancing the rumba. The biomechanics of the ankle joint of a non-amputee, professional dancer were acquired for the development of the bionic control system. Subsequently, a professional dancer who received a traumatic transtibial amputation in April 2013 tested the bionic dance prosthesis and a conventional, passive prosthesis for comparison. The ability to provide similar torque-angle behavior of the biological ankle was assessed to quantify the biological realism of the prostheses. The bionic dancing prosthesis overlapped with 37 ± 6% of the non-amputee ankle torque and ankle angle data, compared to 26 ± 2% for the conventional, passive prosthesis, a statistically greater overlap (p = 0.01. This study lays the foundation for quantifying unique, expressive activity modes currently unavailable to individuals with disabilities. Future work will focus on an expansion of the methods and types of dance investigated in this work.

  16. A short-term study in sheep with the Groningen temporomandibular joint prosthesis

    NARCIS (Netherlands)

    van Loon, JP; de Bont, LGM; Spijkervet, FKL; Verkerke, GJ; Liem, RSB

    2000-01-01

    As part of the pre-clinical testing process of a newly developed temporomandibular joint (TMJ) prosthesis, animal experiments were performed. In 14 sheep, the right TMJ was replaced by the developed TMJ prosthesis. The prosthesis consisted of a skull part, a mandibular part and an intervening polyet

  17. 21 CFR 888.3490 - Knee joint femorotibial metal/composite non-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ...-constrained cemented prosthesis. 888.3490 Section 888.3490 Food and Drugs FOOD AND DRUG ADMINISTRATION... § 888.3490 Knee joint femorotibial metal/composite non-constrained cemented prosthesis. (a) Identification. A knee joint femorotibial metal/composite non-constrained cemented prosthesis is a...

  18. 21 CFR 888.3760 - Wrist joint carpal scaphoid polymer prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Wrist joint carpal scaphoid polymer prosthesis. 888.3760 Section 888.3760 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN... scaphoid polymer prosthesis. (a) Identification. A wrist joint carpal scaphoid polymer prosthesis is a...

  19. 21 CFR 888.3300 - Hip joint metal constrained cemented or uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3300 Section 888.3300 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... metal constrained cemented or uncemented prosthesis. (a) Identification. A hip joint metal constrained cemented or uncemented prosthesis is a device intended to be implanted to replace a hip joint. The...

  20. 21 CFR 888.3520 - Knee joint femorotibial metal/polymer non-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ...-constrained cemented prosthesis. 888.3520 Section 888.3520 Food and Drugs FOOD AND DRUG ADMINISTRATION... § 888.3520 Knee joint femorotibial metal/polymer non-constrained cemented prosthesis. (a) Identification. A knee joint femorotibial metal/polymer non-constrained cemented prosthesis is a device intended...

  1. 21 CFR 874.3540 - Prosthesis modification instrument for ossicular replacement surgery.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Prosthesis modification instrument for ossicular... § 874.3540 Prosthesis modification instrument for ossicular replacement surgery. (a) Identification. A prosthesis modification instrument for ossicular replacement surgery is a device intended for use by...

  2. 21 CFR 888.3565 - Knee joint patellofemorotibial metal/polymer porous-coated uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... porous-coated uncemented prosthesis. 888.3565 Section 888.3565 Food and Drugs FOOD AND DRUG... Devices § 888.3565 Knee joint patellofemorotibial metal/polymer porous-coated uncemented prosthesis. (a) Identification. A knee joint patellofemorotibial metal/polymer porous-coated uncemented prosthesis is a...

  3. 21 CFR 888.3530 - Knee joint femorotibial metal/polymer semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ...-constrained cemented prosthesis. 888.3530 Section 888.3530 Food and Drugs FOOD AND DRUG ADMINISTRATION... § 888.3530 Knee joint femorotibial metal/polymer semi-constrained cemented prosthesis. (a) Identification. A knee joint femorotibial metal/polymer semi-constrained cemented prosthesis is a device...

  4. 21 CFR 888.3360 - Hip joint femoral (hemi-hip) metallic cemented or uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... uncemented prosthesis. 888.3360 Section 888.3360 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Hip joint femoral (hemi-hip) metallic cemented or uncemented prosthesis. (a) Identification. A hip joint femoral (hemi-hip) metallic cemented or uncemented prosthesis is a device intended to be...

  5. 21 CFR 888.3100 - Ankle joint metal/composite semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3100 Section 888.3100 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Ankle joint metal/composite semi-constrained cemented prosthesis. (a) Identification. An ankle joint metal/composite semi-constrained cemented prosthesis is a device intended to be implanted to replace...

  6. 21 CFR 888.3200 - Finger joint metal/metal constrained uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3200 Section 888.3200 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... metal/metal constrained uncemented prosthesis. (a) Identification. A finger joint metal/metal constrained uncemented prosthesis is a device intended to be implanted to replace a metacarpophalangeal...

  7. 21 CFR 888.3660 - Shoulder joint metal/polymer semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3660 Section 888.3660 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Shoulder joint metal/polymer semi-constrained cemented prosthesis. (a) Identification. A shoulder joint metal/polymer semi-constrained cemented prosthesis is a device intended to be implanted to replace...

  8. 21 CFR 888.3550 - Knee joint patellofemorotibial polymer/metal/metal constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... constrained cemented prosthesis. 888.3550 Section 888.3550 Food and Drugs FOOD AND DRUG ADMINISTRATION... § 888.3550 Knee joint patellofemorotibial polymer/metal/metal constrained cemented prosthesis. (a) Identification. A knee joint patellofemorotibial polymer/metal/metal constrained cemented prosthesis is a...

  9. 21 CFR 888.3370 - Hip joint (hemi-hip) acetabular metal cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3370 Section 888.3370 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... (hemi-hip) acetabular metal cemented prosthesis. (a) Identification. A hip joint (hemi-hip) acetabular metal cemented prosthesis is a device intended to be implanted to replace a portion of the hip...

  10. 21 CFR 888.3770 - Wrist joint carpal trapezium polymer prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Wrist joint carpal trapezium polymer prosthesis. 888.3770 Section 888.3770 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN... trapezium polymer prosthesis. (a) Identification. A wrist joint carpal trapezium polymer prosthesis is a...

  11. 21 CFR 888.3580 - Knee joint patellar (hemi-knee) metallic resurfacing uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... resurfacing uncemented prosthesis. 888.3580 Section 888.3580 Food and Drugs FOOD AND DRUG ADMINISTRATION... § 888.3580 Knee joint patellar (hemi-knee) metallic resurfacing uncemented prosthesis. (a) Identification. A knee joint patellar (hemi-knee) metallic resurfacing uncemented prosthesis is a device made...

  12. 21 CFR 888.3170 - Elbow joint radial (hemi-elbow) polymer prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Elbow joint radial (hemi-elbow) polymer prosthesis... (hemi-elbow) polymer prosthesis. (a) Identification. An elbow joint radial (hemi-elbow) polymer prosthesis is a device intended to be implanted made of medical grade silicone elastomer used to replace...

  13. 21 CFR 888.3570 - Knee joint femoral (hemi-knee) metallic uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3570 Section 888.3570 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... femoral (hemi-knee) metallic uncemented prosthesis. (a) Identification. A knee joint femoral (hemi-knee) metallic uncemented prosthesis is a device made of alloys, such as cobalt-chromium-molybdenum, intended...

  14. 21 CFR 888.3400 - Hip joint femoral (hemi-hip) metallic resurfacing prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3400 Section 888.3400 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... femoral (hemi-hip) metallic resurfacing prosthesis. (a) Identification. A hip joint femoral (hemi-hip) metallic resurfacing prosthesis is a device intended to be implanted to replace a portion of the hip...

  15. 21 CFR 888.3690 - Shoulder joint humeral (hemi-shoulder) metallic uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... uncemented prosthesis. 888.3690 Section 888.3690 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Shoulder joint humeral (hemi-shoulder) metallic uncemented prosthesis. (a) Identification. A shoulder joint humeral (hemi-shoulder) metallic uncemented prosthesis is a device made of alloys, such as...

  16. 21 CFR 888.3220 - Finger joint metal/polymer constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3220 Section 888.3220 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... metal/polymer constrained cemented prosthesis. (a) Identification. A finger joint metal/polymer constrained cemented prosthesis is a device intended to be implanted to replace a metacarpophalangeal...

  17. 21 CFR 888.3800 - Wrist joint metal/polymer semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3800 Section 888.3800 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Wrist joint metal/polymer semi-constrained cemented prosthesis. (a) Identification. A wrist joint metal/polymer semi-constrained cemented prosthesis is a device intended to be implanted to replace a wrist...

  18. 21 CFR 888.3210 - Finger joint metal/metal constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3210 Section 888.3210 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... metal/metal constrained cemented prosthesis. (a) Identification. A finger joint metal/metal constrained cemented prosthesis is a device intended to be implanted to replace a metacarpophalangeal (finger)...

  19. 21 CFR 888.3160 - Elbow joint metal/polymer semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3160 Section 888.3160 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Elbow joint metal/polymer semi-constrained cemented prosthesis. (a) Identification. An elbow joint metal/polymer semi-constrained cemented prosthesis is a device intended to be implanted to replace an...

  20. 21 CFR 888.3650 - Shoulder joint metal/polymer non-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3650 Section 888.3650 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Shoulder joint metal/polymer non-constrained cemented prosthesis. (a) Identification. A shoulder joint metal/polymer non-constrained cemented prosthesis is a device intended to be implanted to replace...

  1. 21 CFR 888.3500 - Knee joint femorotibial metal/composite semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ...-constrained cemented prosthesis. 888.3500 Section 888.3500 Food and Drugs FOOD AND DRUG ADMINISTRATION... § 888.3500 Knee joint femorotibial metal/composite semi-constrained cemented prosthesis. (a) Identification. A knee joint femorotibial metal/composite semi-constrained cemented prosthesis is a...

  2. 21 CFR 888.3180 - Elbow joint humeral (hemi-elbow) metallic uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... uncemented prosthesis. 888.3180 Section 888.3180 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Elbow joint humeral (hemi-elbow) metallic uncemented prosthesis. (a) Identification. An elbow joint humeral (hemi-elbow) metallic uncemented prosthesis is a device intended to be implanted made of...

  3. 21 CFR 888.3480 - Knee joint femorotibial metallic constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3480 Section 888.3480 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Knee joint femorotibial metallic constrained cemented prosthesis. (a) Identification. A knee joint femorotibial metallic constrained cemented prosthesis is a device intended to be implanted to replace part of...

  4. 21 CFR 888.3110 - Ankle joint metal/polymer semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3110 Section 888.3110 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Ankle joint metal/polymer semi-constrained cemented prosthesis. (a) Identification. An ankle joint metal/polymer semi-constrained cemented prosthesis is a device intended to be implanted to replace an...

  5. 21 CFR 888.3150 - Elbow joint metal/polymer constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3150 Section 888.3150 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... metal/polymer constrained cemented prosthesis. (a) Identification. An elbow joint metal/polymer constrained cemented prosthesis is a device intended to be implanted to replace an elbow joint. It is made...

  6. 21 CFR 888.3340 - Hip joint metal/composite semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3340 Section 888.3340 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Hip joint metal/composite semi-constrained cemented prosthesis. (a) Identification. A hip joint metal/composite semi-constrained cemented prosthesis is a two-part device intended to be implanted to replace...

  7. 21 CFR 888.3750 - Wrist joint carpal lunate polymer prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Wrist joint carpal lunate polymer prosthesis. 888.3750 Section 888.3750 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN... lunate polymer prosthesis. (a) Identification. A wrist joint carpal lunate prosthesis is a...

  8. 21 CFR 888.3120 - Ankle joint metal/polymer non-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3120 Section 888.3120 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... metal/polymer non-constrained cemented prosthesis. (a) Identification. An ankle joint metal/polymer non-constrained cemented prosthesis is a device intended to be implanted to replace an ankle joint. The...

  9. 21 CFR 888.3540 - Knee joint patellofemoral polymer/metal semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ...-constrained cemented prosthesis. 888.3540 Section 888.3540 Food and Drugs FOOD AND DRUG ADMINISTRATION... § 888.3540 Knee joint patellofemoral polymer/metal semi-constrained cemented prosthesis. (a) Identification. A knee joint patellofemoral polymer/metal semi-constrained cemented prosthesis is a...

  10. 21 CFR 888.3590 - Knee joint tibial (hemi-knee) metallic resurfacing uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... uncemented prosthesis. 888.3590 Section 888.3590 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Knee joint tibial (hemi-knee) metallic resurfacing uncemented prosthesis. (a) Identification. A knee joint tibial (hemi-knee) metallic resurfacing uncemented prosthesis is a device intended to be...

  11. 21 CFR 888.3510 - Knee joint femorotibial metal/polymer constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3510 Section 888.3510 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Knee joint femorotibial metal/polymer constrained cemented prosthesis. (a) Identification. A knee joint femorotibial metal/polymer constrained cemented prosthesis is a device intended to be implanted to replace...

  12. 21 CFR 888.3310 - Hip joint metal/polymer constrained cemented or uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... uncemented prosthesis. 888.3310 Section 888.3310 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Hip joint metal/polymer constrained cemented or uncemented prosthesis. (a) Identification. A hip joint metal/polymer constrained cemented or uncemented prosthesis is a device intended to be implanted...

  13. 21 CFR 888.3790 - Wrist joint metal constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Wrist joint metal constrained cemented prosthesis... constrained cemented prosthesis. (a) Identification. A wrist joint metal constrained cemented prosthesis is a... as cobalt-chromium-molybdenum, and is limited to those prostheses intended for use with bone...

  14. 21 CFR 888.3680 - Shoulder joint glenoid (hemi-shoulder) metallic cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented prosthesis. 888.3680 Section 888.3680 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... Shoulder joint glenoid (hemi-shoulder) metallic cemented prosthesis. (a) Identification. A shoulder joint glenoid (hemi-shoulder) metallic cemented prosthesis is a device that has a glenoid (socket)...

  15. 21 CFR 888.3350 - Hip joint metal/polymer semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... prosthesis. 888.3350 Section 888.3350 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... metal/polymer semi-constrained cemented prosthesis. (a) Identification. A hip joint metal/polymer semi-constrained cemented prosthesis is a device intended to be implanted to replace a hip joint. The device...

  16. 21 CFR 878.3540 - Silicone gel-filled breast prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Silicone gel-filled breast prosthesis. 878.3540... (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3540 Silicone gel-filled breast prosthesis. (a) Identification—(1) Single-lumen silicone gel-filled breast prosthesis....

  17. Nasal prosthesis for a patient with xeroderma pigmentosum

    Directory of Open Access Journals (Sweden)

    Suresh Kumar

    2013-01-01

    Full Text Available Acquired facial defects caused by extirpation of neoplasms, congenital malformations or traumatic injury results in a huge functional, cosmetic and psychological handicap in those patients. These defects can be restored by facial prosthesis using different materials and retention methods to achieve a lifelike appearance and function. This clinical report describes a treatment schedule using silicone nasal prosthesis, which is mechanically retained for a patient who has undergone a partial rhinectomy due to basal cell carcinoma of the nose. The prosthesis was made to restore the esthetic appearance of patient with a mechanically retained design using a spectacle glass frame without any prosthetic adhesives so that the patient is more comfortable and confident to resume daily activities.

  18. Acetabular prosthesis: Proff of migration with ruler and pencil?

    International Nuclear Information System (INIS)

    Conventional X-ray films were made with varying degrees of tilt of a pelvic phantom containing an acetabular prosthesis. The position of the prosthesis was then reconstructed graphically. The measurement errors were calculated and an estimate was made for the tilt. There is a linear correlation between the measurement error and the tilt of the prosthesis. Therefore a tilt dependent maximum error can be calculated. This error is very small for small degrees of tilt, so that acetabular migration can in this instance be evaluated with greater confidence than with other graphical methods. The error also correlates with the determination of the selected region of the acetabulum, but not with the position of the central focus spot or image magnification. (orig.)

  19. Research, design and development project Myoelectric Prosthesis of Upper Limb

    Energy Technology Data Exchange (ETDEWEB)

    Galiano, L; Montaner, E; Flecha, A [Bioparx, J Hernandez 1101, Parana, ERios (Argentina)

    2007-11-15

    A Research Design and Development Project was developed of a myoelectric prosthesis for a pediatric patient presenting congenital amputation of the left forearm below the elbow. A multidisciplinary work-team was formed for this goal, in order to solve the several (/various) aspects regarding this project (mechanical, ergonomics, electronics, physical). The prosthesis as an electromechanical device was divided in several blocks, trying to achieve a focused development for each stage, acording to requisites. A mechanical prototype of the prothesis was designed and built along with the circuitry needed for EMG aquisition, control logic and drivers. Having acomplished the previuos stages, the project is now dealing with the definitions of the interface between the prosthesis and the patient, with promising perspectives.

  20. Research, design & development project Myoelectric Prosthesis of Upper Limb

    Science.gov (United States)

    Galiano, L.; Montaner, E.; Flecha, A.

    2007-11-01

    A Research Design and Development Project was developed of a myoelectric prosthesis for a pediatric patient presenting congenital amputation of the left forearm below the elbow. A multidisciplinary work-team was formed for this goal, in order to solve the several (/various) aspects regarding this project (mechanical, ergonomics, electronics, physical). The prosthesis as an electromechanical device was divided in several blocks, trying to achieve a focused development for each stage, acording to requisites. A mechanical prototype of the prothesis was designed and built along with the circuitry needed for EMG aquisition, control logic and drivers. Having acomplished the previuos stages, the project is now dealing with the definitions of the interface between the prosthesis and the patient, with promising perspectives.

  1. Komposit Laminate Rami Epoksi Sebagai Bahan Alternatif Socket Prosthesis

    Directory of Open Access Journals (Sweden)

    Agustinus P. Irawan

    2009-01-01

    Full Text Available pure plant oil, biofuel, coconut oil, palm oil, jatropha oilSocket is the most important component in a prosthesis making. Performance criteria for prosthetic socket material include strength, durability, minimal weight, comfort, and minimal fabrication cost. This research attempts to analyze the strength of ramie fiber reinforced epoxy laminate composite as an alternative of socket prosthesis. The research based on ASTM D 3039/D 3039M for tensile strength and ASTM D 695 for compressive strength. The ramie fiber used was a continuous fiber 100 % Ne14'S, with Epoxy Resin Bakelite EPR 174 and Epoxy Hardener V-140. The sample test was created using a hand lay-up method. The result of this research is presented in a correlation of finsile strength (st, compression strength (sc, elasticity modulus (E versus fraction volume of fiber (Vf. The result is then being compared with some of the prosthesis material’s strength produced by Otto Bock. The analysis was completed with the mode of the failure observation by using Scanning Electron Microscope (SEM. The result concludes that the ramie fiber reinforced epoxy laminate composite is potentially developed further as a socket prosthesis material on Vf 40 – 50 %. Tensile strength and specific strength that has been generated was higher than that of several materias for socket prosthesis, including fiberglass. The mode of the failure found were a brittle failure on Vf: 10-30%, debonding and delamination on Vf: 40-50%. Abstract in Bahasa Indonesia: Socket merupakan bagian terpenting dalam pembuatan prosthesis. Kriteria bahan socket prosthesis antara lain kekuatan, ketahanan, ringan, kenyamanan dan biaya produksi yang rendah. Penelitian ini bertujuan menganalisis kekuatan komposit laminate berpenguat serat rami epoksi sebagai bahan alternatif socket prosthesis. Pengujian kekuatan mengacu standar ASTM D 3039/D 3039M uji tarik dan ASTM D 695 uji tekan. Serat rami yang digunakan berupa serat kontinyu jenis

  2. Research, design and development project Myoelectric Prosthesis of Upper Limb

    International Nuclear Information System (INIS)

    A Research Design and Development Project was developed of a myoelectric prosthesis for a pediatric patient presenting congenital amputation of the left forearm below the elbow. A multidisciplinary work-team was formed for this goal, in order to solve the several (/various) aspects regarding this project (mechanical, ergonomics, electronics, physical). The prosthesis as an electromechanical device was divided in several blocks, trying to achieve a focused development for each stage, acording to requisites. A mechanical prototype of the prothesis was designed and built along with the circuitry needed for EMG aquisition, control logic and drivers. Having acomplished the previuos stages, the project is now dealing with the definitions of the interface between the prosthesis and the patient, with promising perspectives

  3. Comparison of Titanium vs. Polycel Total Ossicular Replacement Prosthesis

    Directory of Open Access Journals (Sweden)

    Mohammad Faramarzi

    2016-01-01

    Full Text Available Introduction: Even though modern technology progresses so rapidly, annals of otology are replete with so many challenging article, which often compare various types of prosthesis. Since there has not been a prospective randomized clinical trial study which compares the hearing result of total ossicular replacement prosthesis made of Titanium with omega connector and Polycel in the literature, we decided to perform a study encompassing this issue.   Materials and Methods: 105 patients, who were in the 2nd stage of their operation and who needed total ossicular replacement prosthesis, were included in this prospective single blind randomized clinical trial study. Patients were classified in two groups: titanium Kurz (TTP™ -Vario system, Kurz GmbH, Dusslingen, Germany with omega connector and Polycel (Sheehy Plastipore Polycel, Medtronic Xomed Inc. The duration of the follow up was 6-12 months. In order to evaluate hearing results, pure tone audiometric in 0.5, 1, 2, and 4 kHz were checked. In addition, speech reception threshold was recorded. A successful surgery was defined as having a postoperative air–bone gap within 20 dB.   Results: We accomplished successful hearing in 64.4% of patients with titanium and 65% of patients with a Polycel prosthesis.Improvement in speech reception threshold was 11.5 dB in the titanium group and 13 dB in the Polycel group. In other words, there was no significant difference between the two groups. In addition, air-bone gap improvement after ossiculoplasty was 11.2 dB in the patients with a titanium prosthesis and 12.4 dB in the Polycel group. In fact, the difference was not significant.   Conclusion: We found that both the titanium and the Polycel prosthesis improve speech reception threshold and air-bone gap closure in a similar manner.

  4. In vivo performance of photovoltaic subretinal prosthesis

    Science.gov (United States)

    Mandel, Yossi; Goetz, George; Lavinsky, Daniel; Huie, Phil; Mathieson, Keith; Wang, Lele; Kamins, Theodore; Manivanh, Richard; Harris, James; Palanker, Daniel

    2013-02-01

    We have developed a photovoltaic retinal prosthesis, in which camera-captured images are projected onto the retina using pulsed near-IR light. Each pixel in the subretinal implant directly converts pulsed light into local electric current to stimulate the nearby inner retinal neurons. 30 μm-thick implants with pixel sizes of 280, 140 and 70 μm were successfully implanted in the subretinal space of wild type (WT, Long-Evans) and degenerate (Royal College of Surgeons, RCS) rats. Optical Coherence Tomography and fluorescein angiography demonstrated normal retinal thickness and healthy vasculature above the implants upon 6 months follow-up. Stimulation with NIR pulses over the implant elicited robust visual evoked potentials (VEP) at safe irradiance levels. Thresholds increased with decreasing pulse duration and pixel size: with 10 ms pulses it went from 0.5 mW/mm2 on 280 μm pixels to 1.1 mW/mm2 on 140 μm pixels, to 2.1 mW/mm2 on 70 μm pixels. Latency of the implant-evoked VEP was at least 30 ms shorter than in response evoked by the visible light, due to lack of phototransduction. Like with the visible light stimulation in normal sighted animals, amplitude of the implant-induced VEP increased logarithmically with peak irradiance and pulse duration. It decreased with increasing frequency similar to the visible light response in the range of 2 - 10 Hz, but decreased slower than the visible light response at 20 - 40 Hz. Modular design of the photovoltaic arrays allows scalability to a large number of pixels, and combined with the ease of implantation, offers a promising approach to restoration of sight in patients blinded by retinal degenerative diseases.

  5. Active Bone Conduction Prosthesis: BonebridgeTM

    Science.gov (United States)

    Zernotti, Mario E.; Sarasty, Andrea Bravo

    2015-01-01

    Introduction Bone conduction implants are indicated for patients with conductive and mixed hearing loss, as well as for patients with single-sided deafness (SSD). The transcutaneous technology avoids several complications of the percutaneous bone conduction implants including skin reaction, skin growth over the abutment, and wound infection. The Bonebridge (MED-EL, Austria) prosthesis is a semi-implantable hearing system: the BCI (Bone Conduction Implant) is the implantable part that contains the Bone Conduction-Floating Mass Transducer (BC-FMT), which applies the vibrations directly to the bone; the external component is the audio processor Amadé BB (MED-EL, Austria), which digitally processes the sound and sends the information through the coil to the internal part. Bonebridge may be implanted through three different approaches: the transmastoid, the retrosigmoid, or the middle fossa approach. Objective This systematic review aims to describe the world́s first active bone conduction implant system, Bonebridge, as well as describe the surgical techniques in the three possible approaches, showing results from implant centers in the world in terms of functional gain, speech reception thresholds and word recognition scores. Data Synthesis The authors searched the MEDLINE database using the key term Bonebridge. They selected only five publications to include in this systematic review. The review analyzes 20 patients that received Bonebridge implants with different approaches and pathologies. Conclusion Bonebridge is a solution for patients with conductive/mixed hearing loss and SSD with different surgical approaches, depending on their anatomy. The system imparts fewer complications than percutaneous bone conduction implants and shows proven benefits in speech discrimination and functional gain. PMID:26491482

  6. Active Bone Conduction Prosthesis: Bonebridge(TM).

    Science.gov (United States)

    Zernotti, Mario E; Sarasty, Andrea Bravo

    2015-10-01

    Introduction Bone conduction implants are indicated for patients with conductive and mixed hearing loss, as well as for patients with single-sided deafness (SSD). The transcutaneous technology avoids several complications of the percutaneous bone conduction implants including skin reaction, skin growth over the abutment, and wound infection. The Bonebridge (MED-EL, Austria) prosthesis is a semi-implantable hearing system: the BCI (Bone Conduction Implant) is the implantable part that contains the Bone Conduction-Floating Mass Transducer (BC-FMT), which applies the vibrations directly to the bone; the external component is the audio processor Amadé BB (MED-EL, Austria), which digitally processes the sound and sends the information through the coil to the internal part. Bonebridge may be implanted through three different approaches: the transmastoid, the retrosigmoid, or the middle fossa approach. Objective This systematic review aims to describe the world́s first active bone conduction implant system, Bonebridge, as well as describe the surgical techniques in the three possible approaches, showing results from implant centers in the world in terms of functional gain, speech reception thresholds and word recognition scores. Data Synthesis The authors searched the MEDLINE database using the key term Bonebridge. They selected only five publications to include in this systematic review. The review analyzes 20 patients that received Bonebridge implants with different approaches and pathologies. Conclusion Bonebridge is a solution for patients with conductive/mixed hearing loss and SSD with different surgical approaches, depending on their anatomy. The system imparts fewer complications than percutaneous bone conduction implants and shows proven benefits in speech discrimination and functional gain. PMID:26491482

  7. Modul femur prosthesis for major upper femoral bone defects

    International Nuclear Information System (INIS)

    The Koelner modul femur prosthesis MECROSET represents a device to be composed of standardised units. It allows the surgeon dealing with large bone defects of the upper femoral end to meet the special local requirements by building up the appropriate implant. This device may cope with bone losses of up to 22 cms, measured down from the tip of the major trochanter. Combination with ordinary cups is possible. Indications proven are upper femoral defects following disease, exchange of prosthesis and trauma. The ten patients thus provided did not show any complications during a 2-year period of observation. Long-term results are still to be awaited. (orig.)

  8. The specialty of bucomaxillofacial prosthesis and its performance in Dentistry

    Directory of Open Access Journals (Sweden)

    Fabiano Geronasso SIMÕES

    2009-09-01

    Full Text Available Introduction:The human attempt to restore the bucomaxillofacialregion by heteroplasia is as old as the formation of civilizations. Archaeological excavations have revealed Egyptian mummies with artificial eyes, nose and ears.Objective and literature review:The aim of this study was to report the evolution and importance of bucomaxillofacial prosthesis,which might be the greatest challenge ofdental surgeons within the specialties of Dentistry.Conclusion: Thebucomaxillofacial prosthesis outreach in health sector is extremelyimportant,and Dentistry plays an essential role in modern society tothe rehabilitation of patients in need of such treatment.

  9. Aspiration of tracheoesophageal prosthesis in a laryngectomized patient

    Directory of Open Access Journals (Sweden)

    Conte Sergio C

    2012-08-01

    Full Text Available Abstract Background The voice prosthesis inserted into a tracheoesophageal fistula has become the most widely used device for voice rehabilitation in patients with total laryngectomy. Case presentation We describe a case of tracheoesophageal prosthesis’ (TEP aspiration in a laryngectomized patient, with permanent tracheal stoma, that appeared during standard cleaning procedure, despite a programme of training for the safe management of patients with voice prosthesis. Conclusions The definitive diagnosis and treatment were performed by flexible bronchoscopy, that may be considered the procedure of choice in these cases, also on the basis of the literature.

  10. A systematic graph-based method for the kinematic synthesis of non-anthropomorphic wearable robots for the lower limbs

    Science.gov (United States)

    Sergi, Fabrizio; Accoto, Dino; Tagliamonte, Nevio L.; Carpino, Giorgio; Guglielmelli, Eugenio

    2011-03-01

    The choice of non-anthropomorphic kinematic solutions for wearable robots is motivated both by the necessity of improving the ergonomics of physical Human-Robot Interaction and by the chance of exploiting the intrinsic dynamical properties of the robotic structure so to improve its performances. Under these aspects, this new class of robotic solutions is potentially advantageous over the one of anthropomorphic robotic orthoses. However, the process of kinematic synthesis of non-anthropomorphic wearable robots can be too complex to be solved uniquely by relying on conventional synthesis methods, due to the large number of open design parameters. A systematic approach can be useful for this purpose, since it allows to obtain the complete list of independent kinematic solutions with desired properties. In this perspective, this paper presents a method, which allows to generalize the problem of kinematic synthesis of a non-anthropomorphic wearable robot for the assistance of a specified set of contiguous body segments. The methodology also includes two novel tests, specifically devised to solve the problem of enumeration of kinematic structures of wearable robots: the HR-isomorphism and the HR-degeneracy tests. This method has been implemented to derive the atlas of independent kinematic solutions suitable to be used for the kinematic design of a planar wearable robot for the lower limbs.

  11. Creating an anthropomorphic digital MR phantom—an extensible tool for comparing and evaluating quantitative imaging algorithms

    Science.gov (United States)

    Bosca, Ryan J.; Jackson, Edward F.

    2016-01-01

    Assessing and mitigating the various sources of bias and variance associated with image quantification algorithms is essential to the use of such algorithms in clinical research and practice. Assessment is usually accomplished with grid-based digital reference objects (DRO) or, more recently, digital anthropomorphic phantoms based on normal human anatomy. Publicly available digital anthropomorphic phantoms can provide a basis for generating realistic model-based DROs that incorporate the heterogeneity commonly found in pathology. Using a publicly available vascular input function (VIF) and digital anthropomorphic phantom of a normal human brain, a methodology was developed to generate a DRO based on the general kinetic model (GKM) that represented realistic and heterogeneously enhancing pathology. GKM parameters were estimated from a deidentified clinical dynamic contrast-enhanced (DCE) MRI exam. This clinical imaging volume was co-registered with a discrete tissue model, and model parameters estimated from clinical images were used to synthesize a DCE-MRI exam that consisted of normal brain tissues and a heterogeneously enhancing brain tumor. An example application of spatial smoothing was used to illustrate potential applications in assessing quantitative imaging algorithms. A voxel-wise Bland-Altman analysis demonstrated negligible differences between the parameters estimated with and without spatial smoothing (using a small radius Gaussian kernel). In this work, we reported an extensible methodology for generating model-based anthropomorphic DROs containing normal and pathological tissue that can be used to assess quantitative imaging algorithms.

  12. Rehabilitation of orbital defect with silicone orbital prosthesis retained by dental implants

    Science.gov (United States)

    Guttal, Satyabodh Shesharaj; Desai, Jhanvi; Kudva, Adarsh; Patil, Basavaraj R

    2016-01-01

    Orbital defects can result from cancer, birth anomalies, or trauma leading to an onslaught of problems in the function and psyche of the patient. These defects are restored by surgical reconstruction and followed by placement of orbital prosthesis for cosmetic makeup. The use of dental implants in retaining orbital prosthesis improves patient acceptance of the prosthesis owing to better retention and stability than conventional adhesive retained prosthesis. This case report describes a custom-made magnetic retentive assembly anchored by a dental implant which offers the orbital prosthesis the simplicity of self-alignment and ease of use. PMID:26953033

  13. Percutaneous Revision of a Testicular Prosthesis is Safe, Cost-effective, and Provides Good Patient Satisfaction

    Directory of Open Access Journals (Sweden)

    Eugene B. Cone

    2015-09-01

    Full Text Available Office-based percutaneous revision of a testicular prosthesis has never been reported. A patient received a testicular prosthesis but was dissatisfied with the firmness of the implant. In an office setting, the prosthesis was inflated with additional fluid via a percutaneous approach. Evaluated outcomes included patient satisfaction, prosthesis size, recovery time, and cost savings. The patient was satisfied, with no infection, leak, or complication after more than 1 year of follow-up, at significantly less cost than revision surgery. Percutaneous adjustment of testicular prosthesis fill-volume can be safe, inexpensive, and result in good patient satisfaction.

  14. Management of long span partially edentulous maxilla with fixed removable denture prosthesis

    Directory of Open Access Journals (Sweden)

    Mahilan I Jeyavalan

    2012-01-01

    Full Text Available Restoration of a long span partially edentulous maxilla with tooth supported prosthesis is challenging because of inherent anatomic limitations and unfavourable biomechanics present after the loss of teeth. A tooth supported fixed-removable prosthesis is a treatment option for restoration of such long span partially edentulous maxillary arches. This prosthesis meets the requirements for esthetics, phonetics, comfort, and hygiene, as well as favourable biomechanical stress distribution to the remaining natural tooth abutments. This article presents a procedure for fabrication of a fixed-removable prosthesis that has cement-retained custom cast bar metal substructure and a ball attachment retained removable superstructure prosthesis.

  15. Identification of anthropomorphic, teleological and vitalist conceptions amongst participants of an annual meeting of SBBq

    Directory of Open Access Journals (Sweden)

    Ariane Leites Larentis

    2016-05-01

    Full Text Available The aim of this work was to identify epistemological obstacles amongst participants of XXXIX Annual Meeting of Brazilian Society of Biochemistry and Molecular Biology. A questionnaire with selected excerpts of scientific papers from high impact factor journals was answered by 97 participants of this annual meeting (39 under-graduates, 42 graduate students, and 16 professors and researchers. From Bachelard’s notion of teleological obstacle, it was possible to identify vitalist conceptions (animism, teleological approaches of the evolution processes, expressed in apologies of immanent purposes in organisms’ adaptation, and an anthropomorphic vision of the biological processes under evaluation in the answers and also in the acceptance or not recognition of these obstacles in the excerpts. The presence of figures of speech, metaphors and analogies (verbal obstacle were verified in explaining the evolution and the immune system, also present in the excerpts.

  16. FlexyDos3D: a deformable anthropomorphic 3D radiation dosimeter: radiation properties

    DEFF Research Database (Denmark)

    De Deene, Yves; Skyt, Peter Sandegaard; Hill, Robin;

    2015-01-01

    registration software.A new three dimensional anthropomorphically shaped flexible dosimeter, further called 'FlexyDos3D', has been constructed and a new fast optical scanning method has been implemented that enables scanning of irregular shaped dosimeters. The FlexyDos3D phantom can be actuated and deformed...... during the actual treatment. FlexyDos3D offers the additional advantage that it is easy to fabricate, is non-toxic and can be molded in an arbitrary shape with high geometrical precision.The dosimeter formulation has been optimized in terms of dose sensitivity. The influence of the casting material and......Three dimensional radiation dosimetry has received growing interest with the implementation of highly conformal radiotherapy treatments. The radiotherapy community faces new challenges with the commissioning of image guided and image gated radiotherapy treatments (IGRT) and deformable image...

  17. Dual wavelength optical CT scanning of anthropomorphic shaped 3D dosimeters

    International Nuclear Information System (INIS)

    To create an optical density map of 3D dosimeter phantoms, the ratio of the transmission profile (either a line or planar) acquired after irradiation of the dosimeter and a pre-irradiation reference scan of the same dosimeter phantom is taken. Any uncertainty in repositioning of the phantom may result in an uncertainty in the optical density map and finally also in the derived dose maps. Correct repositioning is paramount when scanning noncylindrical dosimeter phantoms as any repositioning error will give rise to severe imaging artifacts. We hereby propose a different scanning technique that does not require any repositioning of the dosimeter phantom. In this method, no pre-irradiation san is recorded but the dosimeter phantom is scanned twice with light at two different wavelengths. It is demonstrated that this method is accurate in scanning non-cylindrical anthropomorphic shaped phantoms

  18. Calibration of a total body potassium monitor with an anthropomorphic phantom

    Science.gov (United States)

    Hansen, R. D.; Allen, B. J.

    1996-11-01

    An anthropomorphic phantom was used to calibrate a supine geometry sodium iodide total body potassium monitor. Correction factors accommodating variability in subject size were empirically determined. Measurements on 12 males of weight 45 - 96 kg, height 161 - 184 cm and 18 females of weight 48 - 89 kg, height 153 - 175 cm, showed that the calibration factor was significantly correlated (r = 0.88, p , indicating comparable accuracy to -based calibration procedures. Fat-free mass determined from the potassium measurements of 16 subjects correlated significantly with fat-free mass estimated from skinfold thickness (r = 0.98, p bioimpedance analysis (r = 0.98, p -based methods of calibrating total body potassium monitors.

  19. Calibration of a total body potassium monitor with an anthropomorphic phantom

    International Nuclear Information System (INIS)

    An anthropomorphic phantom was used to calibrate a supine geometry sodium iodide total body potassium monitor. Correction factors accommodating variability in subject size were empirically determined. Measurements on 12 males of weight 45-96 kg, height 161-184 cm and 18 females of weight 48-89 kg, height 153-175 cm, showed that the 40K calibration factor (F,countss-1(gofpotassium)-1 was significantly correlated (r=0.88, p0.5, indicating comparable accuracy to 42K-based calibration procedures. Fat-free mass determined from the potassium measurements of 16 subjects correlated significantly with fat-free mass estimated from skinfold thickness (r=0.98, p42K-based methods of calibrating total body potassium monitors. (author)

  20. Calibration of a total body potassium monitor with an anthropomorphic phantom.

    Science.gov (United States)

    Hansen, R D; Allen, B J

    1996-11-01

    An anthropomorphic phantom was used to calibrate a supine geometry sodium iodide total body potassium monitor. Correction factors accommodating variability in subject size were empirically determined. Measurements on 12 males of weight 45-96 kg, height 161-184 cm and 18 females of weight 48-89 kg, height 153-175 cm, showed that the 40K calibration factor (F, counts s-1 (g of potassium)-1) was significantly correlated (r = 0.88, p bioimpedance analysis (r = 0.98, p < 0.0001). These data, together with the precision (coefficient of variation, CV = 1.5%) and accuracy (CV = 4.5%) of the system, indicate that this calibration procedure represents a relatively low-cost, non-invasive alternative to 42K-based methods of calibrating total body potassium monitors. PMID:8938038

  1. A computer-controlled pump and realistic anthropomorphic respiratory phantom for validating image-guided systems

    Science.gov (United States)

    Lin, Ralph; Wilson, Emmanuel; Tang, Jonathan; Stoianovici, Dan; Cleary, Kevin

    2007-03-01

    The development of image-guided interventions requires validation studies to evaluate new protocols. So far, these validation studies have been limited to animal models and to software and physical phantoms that simulate respiratory motion but cannot accommodate needle punctures in a realistic manner. We have built a computer-controlled pump that drives an anthropomorphic respiratory phantom for simulating natural breathing patterns. This pump consists of a power supply, a motion controller with servo amplifier, linear actuator, and custom fabricated pump assembly. By generating several sample waveforms, we were able to simulate typical breathing patterns. Using this pump, we were able to produce chest wall movements similar to typical chest wall movements observed in humans. This system has potential applications for evaluating new respiratory compensation algorithms and may facilitate improved testing of image-guided protocols under realistic interventional conditions.

  2. Bases for calibration of whole body counters using anthropomorphic physical simulators

    International Nuclear Information System (INIS)

    The quantification of radionuclides in the human body can be carried out through in vivo measurements performed in facilities generically called whole body counters. The calibration of such units is usually done by using physical anthropomorphic phantoms, which can be defined as artificial structures with geometrical characteristics and attenuation properties similar to the living tissues. This work presents the development of the phantoms necessary to the monitoring of the internal contamination by the radionuclides manipulated in Brazil. It also presents the procedures for the calibration of the detectors used for the in vivo measurements. The developed phantoms are applied in the determination of radionuclides deposited in specific organs, such as Th-232 and Am-241 in the lungs and skull, isotopes of iodine in the thyroid and photon emitters in the energy range from 100 to 3000 keV in the whole body. (author)

  3. Contextual analysis of fragmentation of the anthropomorphic figurines from the Late Neolithic site of Selevac

    Directory of Open Access Journals (Sweden)

    Marko Porčić

    2016-03-01

    Full Text Available The biographical approach to material culture and the hypothesis of deliberate fragmentation of anthropomorphic figurines are used in this paper to deduce a hypothesis that there should be an association between particular fragmentation categories and context types in the archaeological record of the Late Neolithic settlements in Central Balkans. This hypothesis is tested using published data from the site of Selevac by performing correspondence analysis and chi-square test on a contingency table in which categories of fragmentation are cross-tabulated with context types. The results are statistically significant, suggesting that complete figurines are associated with houses while transversely broken figurines are associated with pits. There is also evidence that figurines were broken differentially in respect to their original size.

  4. Evaluation of radiation dose to anthropomorphic paediatric models from positron-emitting labelled tracers

    International Nuclear Information System (INIS)

    PET uses specific molecules labelled with positron-emitting radionuclides to provide valuable biochemical and physiological information. However, the administration of radiotracers to patients exposes them to low-dose ionizing radiation, which is a concern in the paediatric population since children are at a higher cancer risk from radiation exposure than adults. Therefore, radiation dosimety calculations for commonly used positron-emitting radiotracers in the paediatric population are highly desired. We evaluate the absorbed dose and effective dose for 19 positron-emitting labelled radiotracers in anthropomorphic paediatric models including the newborn, 1-, 5-, 10- and 15-year-old male and female. This is achieved using pre-calculated S-values of positron-emitting radionuclides of UF-NCI paediatric phantoms and published biokinetic data for various radiotracers. The influence of the type of anthropomorphic model, tissue weight factors and direct human- versus mouse-derived biokinetic data on the effective dose for paediatric phantoms was also evaluated. In the case of 18F-FDG, dosimetry calculations of reference paediatric patients from various dose regimens were also calculated. Among the considered radiotracers, 18F-FBPA and 15O-water resulted in the highest and lowest effective dose in the paediatric phantoms, respectively. The ICRP 103 updated tissue-weighting factors decrease the effective dose in most cases. Substantial differences of radiation dose were observed between direct human- versus mouse-derived biokinetic data. Moreover, the effect of using voxel- versus MIRD-type models on the calculation of the effective dose was also studied. The generated database of absorbed organ dose and effective dose for various positron-emitting labelled radiotracers using new generation computational models and the new ICRP tissue-weighting factors can be used for the assessment of radiation risks to paediatric patients in clinical practice. This work also contributes

  5. Development of a 3D high-resolution physical anthropomorphic breast phantom

    Science.gov (United States)

    Carton, Ann-Katherine; Bakic, Predrag; Ullberg, Christer; Maidment, Andrew D. A.

    2010-04-01

    Analysis of complex imaging tasks requires a phantom that simulates the patient anatomy. We have developed a technique to fabricate 3D physical anthropomorphic breast phantoms for image quality assessment of 2D and 3D breast x-ray imaging systems. The phantom design is based on an existing computer model that can generate breast voxel phantoms of varying size, shape, glandularity, and internal composition. The physical phantom is produced in two steps. First, the computer model of the glandular tissue, skin and Coopers' ligaments is separated into sections. These sections are fabricated by high-resolution rapid prototype printing using a single tissue equivalent material. The adipose tissue regions in the sections are filled using an epoxy-based resin combined with phenolic microspheres. The phantom sections are then stacked. The phantom is provided with an extra section modified to include iodine-enhanced masses. We fabricated a prototype phantom corresponding to a 450 ml breast with 45% dense tissue deformed to represent a 5 cm compressed thickness. The rapid prototype and epoxy based resin phantom materials attenuate x rays similar to 50% glandular tissue and 100% adipose tissue, respectively. The iodinated masses are between 4.0 and 9.6 mm thick and contain 2.5 mg/ml and 5 mg/ml iodine. Digital mammography and digital breast tomosynthesis images of the phantom are qualitatively similar in appearance to clinical images. In summary, a method to fabricate a 3D physical anthropomorphic breast phantom has been developed with known ground truth in the form of a companion voxel phantom. This combined system of physical and computational phantoms allows for both qualitative and quantitative image quality assessment.

  6. Rapid genetic algorithm optimization of a mouse computational model: Benefits for anthropomorphization of neonatal mouse cardiomyocytes

    Directory of Open Access Journals (Sweden)

    Corina Teodora Bot

    2012-11-01

    Full Text Available While the mouse presents an invaluable experimental model organism in biology, its usefulness in cardiac arrhythmia research is limited in some aspects due to major electrophysiological differences between murine and human action potentials (APs. As previously described, these species-specific traits can be partly overcome by application of a cell-type transforming clamp (CTC to anthropomorphize the murine cardiac AP. CTC is a hybrid experimental-computational dynamic clamp technique, in which a computationally calculated time-dependent current is inserted into a cell in real time, to compensate for the differences between sarcolemmal currents of that cell (e.g., murine and the desired species (e.g., human. For effective CTC performance, mismatch between the measured cell and a mathematical model used to mimic the measured AP must be minimal. We have developed a genetic algorithm (GA approach that rapidly tunes a mathematical model to reproduce the AP of the murine cardiac myocyte under study. Compared to a prior implementation that used a template-based model selection approach, we show that GA optimization to a cell-specific model results in a much better recapitulation of the desired AP morphology with CTC. This improvement was more pronounced when anthropomorphizing neonatal mouse cardiomyocytes to human-like APs than to guinea pig APs. CTC may be useful for a wide range of applications, from screening effects of pharmaceutical compounds on ion channel activity, to exploring variations in the mouse or human genome. Rapid GA optimization of a cell-specific mathematical model improves CTC performance and may therefore expand the applicability and usage of the CTC technique.

  7. An anthropomorphic pelvis phantom for optimization of the diagnosis of lymph node metastases in the pelvis

    International Nuclear Information System (INIS)

    An anthropomorphic pelvis phantom was made by the modification of a National Electrical Manufacturers Association (NEMA) phantom, currently the most popular one, and its clinical usefulness was evaluated. The NEMA plus bone phantom was made by placing the pelvic bone model in the NEMA phantom. The NEMA plus bladder phantom was made by placing an imitation of the urinary bladder in the NEMA phantom. The pelvis phantom was also made by placing both the pelvic bone model and the bladder in the NEMA phantom. Four kinds of phantoms were imaged by both 2D and 3D dynamic modes, and for each phantom, prompt coincidence count rates, random ones, true plus scatter ones, and single photon rates were measured and these coincidence count rates were compared with those from the actual clinical data. After image reconstruction, the contrast ratio and image noise were also investigated. For the random coincidence count rate, the data obtained from each phantom showed good correspondence to the clinical data. The prompt coincidence count rates and true plus scatter ones of the clinical data were different from those obtained from NEMA phantom, NEMA plus bone one and NEMA plus bladder one, whereas there was a good correspondence between the data of the pelvis phantom and the clinical data. For the contrast ratio and image noise, there were discrepancies between the data of NEMA phantom and pelvis phantoms. We made an anthropomorphic pelvis phantom by the simple modification of a NEMA phantom. This phantom showed performance similar to that of the actual human pelvis, suggesting clinical usefulness in the evaluation of new acquisition protocols and reconstruction algorithms. (author)

  8. Evaluation of radiation dose to anthropomorphic paediatric models from positron-emitting labelled tracers

    Science.gov (United States)

    Xie, Tianwu; Zaidi, Habib

    2014-03-01

    PET uses specific molecules labelled with positron-emitting radionuclides to provide valuable biochemical and physiological information. However, the administration of radiotracers to patients exposes them to low-dose ionizing radiation, which is a concern in the paediatric population since children are at a higher cancer risk from radiation exposure than adults. Therefore, radiation dosimety calculations for commonly used positron-emitting radiotracers in the paediatric population are highly desired. We evaluate the absorbed dose and effective dose for 19 positron-emitting labelled radiotracers in anthropomorphic paediatric models including the newborn, 1-, 5-, 10- and 15-year-old male and female. This is achieved using pre-calculated S-values of positron-emitting radionuclides of UF-NCI paediatric phantoms and published biokinetic data for various radiotracers. The influence of the type of anthropomorphic model, tissue weight factors and direct human- versus mouse-derived biokinetic data on the effective dose for paediatric phantoms was also evaluated. In the case of 18F-FDG, dosimetry calculations of reference paediatric patients from various dose regimens were also calculated. Among the considered radiotracers, 18F-FBPA and 15O-water resulted in the highest and lowest effective dose in the paediatric phantoms, respectively. The ICRP 103 updated tissue-weighting factors decrease the effective dose in most cases. Substantial differences of radiation dose were observed between direct human- versus mouse-derived biokinetic data. Moreover, the effect of using voxel- versus MIRD-type models on the calculation of the effective dose was also studied. The generated database of absorbed organ dose and effective dose for various positron-emitting labelled radiotracers using new generation computational models and the new ICRP tissue-weighting factors can be used for the assessment of radiation risks to paediatric patients in clinical practice. This work also contributes

  9. Enhanced Neurobehavioral Outcomes of Action Observation Prosthesis Training.

    Science.gov (United States)

    Cusack, William F; Thach, Scott; Patterson, Rebecca; Acker, Dan; Kistenberg, Robert S; Wheaton, Lewis A

    2016-07-01

    Background Previous studies have demonstrated improved neurobehavioral outcomes when prosthesis users learn task-specific behaviors by imitating movements of prosthesis users (matched limb) compared with intact limbs (mismatched limb). Objective This study is the first to use a unique combination of neurophysiological and task performance methods to investigate prosthetic device training strategies from a cognitive motor control perspective. Intact nonamputated prosthesis users (NAPUs) donned specially adapted prosthetic devices to simulate the wrist and forearm movement that persons with transradial limb loss experience. The hypothesis is that NAPUs trained with matched limb imitation would show greater engagement of parietofrontal regions and reduced movement variability compared with their counterparts trained with a mismatched limb. Methods Training elapsed over 3 days comprised alternating periods of video demonstration observation followed by action imitation. At the beginning and end of the training protocol, participants performed a cued movement paradigm while electroencephalography and electrogoniometry data were collected to track changes in cortical activity and movement variability, respectively. Results Matched limb participants showed greater engagement of motor-related areas while mismatched limb participants showed greater engagement of the parietooccipital system. Matched limb participants also showed lower movement variability. Conclusions These results indicate that the type of limb imitated influences neural and behavioral strategies for novel prosthetic device usage. This finding is important, as customary prosthetic rehabilitation with intact therapists involves mismatched limb imitation that may exacerbate challenges in adapting to new motor patterns demanded by prosthesis use. PMID:26438442

  10. Wispy Prosthesis: A Novel Method in Denture Weight Reduction

    Science.gov (United States)

    Anne, Gopinadh; Budeti, Sreedevi; Anche, Sampath Kumar; Zakkula, Srujana; Atla, Jyothi; Jyothula, Ravi Rakesh Dev; Peddinti, Vijaya Kumar

    2016-01-01

    Introduction Stability and retention of the denture becomes at stake with the increase in weight of the denture prosthesis. As a consequence, different materials and methods have been introduced to overcome these issues but denture weight reduction still remains to be a cumbersome and strenuous procedure. Aim To introduce a novel technique for the fabrication of denture prosthesis where in the weight of the denture will not affect the retention and stability of the denture. Materials and Methods Four groups with a sample size of 10 each, were included where in one group was control and other three were study groups. The control group samples were made completely solid and the study group samples were packed with materials like bean balls, cellulose balls and polyacrylic fibers. The weight of all the samples of each study group was measured and compared with the control group. The observations were analyzed statistically by paired t-test. Results It was observed that the bean balls group produced a weight reduction of 31.3%, cellulose balls group 27.4% and polyacrylic fibers group 24.5% when compared to that of the control group. Conclusion This novel technique will eliminate the problems that were associated in creating hollowness and at the same time will reduce the weight of the prosthesis and among all the study groups, bean balls group were found to reduce maximum weight of the prosthesis. PMID:27190947

  11. Nuclear medicine and articulation prosthesis of the lower limbs

    International Nuclear Information System (INIS)

    Several nuclear medicine procedures can help the surgeons in the diagnosis of the complications of articulations prosthesis of the lower limbs, in particular in case of torpid infection. Even if the diagnosis remains uncertain, the indications and the interpretation of these procedures benefit of a close collaboration between nuclear medicine specialist and clinicians. (author)

  12. Groningen temporomandibular joint prosthesis. Development and first clinical application

    NARCIS (Netherlands)

    van Loon, JP; de Bont, LGM; Stegenga, B; Spijkervet, FKL; Verkerke, GJ

    2002-01-01

    Patients with a severely degenerated temporomandibular joint (TMJ) may benefit from an alloplastic TMJ replacement. The aim of the study was to develop a safe and properly functioning TMJ prosthesis. The design was based on imitation of anterior condylar translation by an inferiorly located centre o

  13. Guest Editorial: Training protocol for powered shoulder prosthesis

    Directory of Open Access Journals (Sweden)

    Linda Resnik, PT, PhD

    2015-01-01

    Full Text Available There is a scarcity of literature on rehabilitation training protocols for upper-limb prosthesis use. Seminal textbooks and articles describe protocols for training individuals to use conventional body-powered, myoelectric, or passive prosthetic devices and were written prior to the introduction of multifunction prosthetic hands and more advanced prosthetic technologies.

  14. Guest Editorial: Training protocol for powered shoulder prosthesis

    OpenAIRE

    Linda Resnik, PT, PhD; Shana Lieberman Klinger, MA; Kathryn Korp, OTR/L, OTD; Lisa Smurr Walters, OTR/L, CHT

    2015-01-01

    There is a scarcity of literature on rehabilitation training protocols for upper-limb prosthesis use. Seminal textbooks and articles describe protocols for training individuals to use conventional body-powered, myoelectric, or passive prosthetic devices and were written prior to the introduction of multifunction prosthetic hands and more advanced prosthetic technologies.

  15. Engineering Design of an Adaptive Leg Prosthesis Using Biological Principles

    DEFF Research Database (Denmark)

    Lenau, Torben Anker; Dentel, Andy; Invarsdottir, Thorunn;

    2010-01-01

    The biomimetic design process is explored through a design case: An adaptive leg prosthesis. The aim is to investigate if the biomimetic design process can be carried out with a minimum of biological knowledge and without using advanced design methods. In the design case biomimetic design was...

  16. Histologic analysis of a retrieved hydroxyapatite-coated femoral prosthesis

    DEFF Research Database (Denmark)

    Søballe, K; Gotfredsen, K; Brockstedt-Rasmussen, H;

    1991-01-01

    A hydroxyapatite-coated hip hemi-prosthesis was retrieved from a 98-year-old osteoporotic woman 12 weeks after implantation. Histologic analysis revealed bone and fibrous tissue almost evenly distributed around the surface of the implant circumference. Quantitative histologic analysis showed that...

  17. Strain-stress analysis of surface prosthesis of hip joint

    Czech Academy of Sciences Publication Activity Database

    Návrat, Tomáš; Fuis, Vladimír; Florian, Z.; Hlavoň, Pavel

    Vol. XXI Congress. Taipei, Taiwan : Elsevier, 2007 - (Huiskes, R.). S559-S559 ISBN 9789868299016. ISSN 0021-9290. [ISB 2007. 01.07.2007-05.07.2007, Taipei] R&D Projects: GA ČR GA101/05/0136 Institutional research plan: CEZ:AV0Z20760514 Keywords : surface prosthesis * hip joint * FEM Subject RIV: BO - Biophysics

  18. Strain-stress analysis of surface prosthesis of hip joint

    Czech Academy of Sciences Publication Activity Database

    Návrat, Tomáš; Fuis, Vladimír; Florian, Z.; Hlavoň, Pavel

    2007-01-01

    Roč. 40, č. 2 (2007), S559-S559. ISSN 0021-9290. [ISB 2007. Taipei, 01.07.2007-05.07.2007] R&D Projects: GA ČR GA101/05/0136 Institutional research plan: CEZ:AV0Z20760514 Keywords : surface prosthesis * hip joint * FEM Subject RIV: BO - Biophysics Impact factor: 2.897, year: 2007

  19. Amplatzer occlusion of paravalvular leak of mitral mechanical prosthesis following a reoperation for thrombosed mitral mechanical prosthesis

    OpenAIRE

    Nikolic, Aleksandar; Schranz, Ditmaer; HRISTOV, Nikola; Mitrev, Zan

    2008-01-01

    We describe a case of a 46-year-old woman with dehiscence and paravalvular leak of a second-time replaced mitral mechanical prosthesis, successfully treated with Amplatzer occlusion of the paravalvular leak, thus avoiding a second reoperation and improving the patient’s symptoms.

  20. Powered ankle-foot prosthesis for the improvement of amputee ambulation.

    Science.gov (United States)

    Au, Samuel K; Herr, Hugh; Weber, Jeff; Martinez-Villalpando, Ernesto C

    2007-01-01

    This paper presents the mechanical design, control scheme, and clinical evaluation of a novel, motorized ankle-foot prosthesis, called MIT Powered Ankle-Foot Prosthesis. Unlike a conventional passive-elastic ankle-foot prosthesis, this prosthesis can provide active mechanical power during the stance period of walking. The basic architecture of the prosthesis is a unidirectional spring, configured in parallel with a force-controllable actuator with series elasticity. With this architecture, the anklefoot prosthesis matches the size and weight of the human ankle, and is also capable of delivering high mechanical power and torque observed in normal human walking. We also propose a biomimetic control scheme that allows the prosthesis to mimic the normal human ankle behavior during walking. To evaluate the performance of the prosthesis, we measured the rate of oxygen consumption of three unilateral transtibial amputees walking at self-selected speeds to estimate the metabolic walking economy. We find that the powered prosthesis improves amputee metabolic economy from 7% to 20% compared to the conventional passive-elastic prostheses (Flex-Foot Ceterus and Freedom Innovations Sierra), even though the powered system is twofold heavier than the conventional devices. This result highlights the benefit of performing net positive work at the ankle joint to amputee ambulation and also suggests a new direction for further advancement of an ankle-foot prosthesis. PMID:18002631

  1. Transfemoral sockets with vacuum-assisted suspension comparison of hip kinematics, socket position, contact pressure, and preference: Ischial containment versus brimless

    Directory of Open Access Journals (Sweden)

    Jason T. Kahle, MSMS, CPO, FAAOP

    2013-12-01

    Full Text Available The objective of this study was to investigate the effect of brimless compared with ischial ramus containment (IRC prosthetic sockets when using vacuum-assisted suspension (VAS on persons with a unilateral transfemoral amputation (TFA. A randomized crossover design with a 2 d accommodation was used. People with unilateral TFA (n = 9 analyzed were enrolled. Interventions were IRC VAS and brimless VAS sockets. Main outcome measures included coronal hip angle and vertical and lateral socket movement as measured by X-ray, skin pressure measured by Tekscan, and preference measured subjectively. The brimless design was statistically equivalent to IRC in all measured coronal hip angles and vertical and lateral socket displacement. The peak/stance mean pressure in the medial proximal aspect of the socket was 322 mmHg in the IRC compared with 190 mmHg in the brimless condition. Except for medial proximal pressure, no other measures reached statistical significance. All subjects reported the brimless design to be more comfortable than the IRC in short-term preference. Brimless VAS socket design may be a clinically viable choice for people with TFA.

  2. Transfemoral sockets with vacuum-assisted suspension comparison of hip kinematics, socket position, contact pressure, and preference: ischial containment versus brimless.

    Science.gov (United States)

    Kahle, Jason T; Highsmith, M Jason

    2013-01-01

    The objective of this study was to investigate the effect of brimless compared with ischial ramus containment (IRC) prosthetic sockets when using vacuum-assisted suspension (VAS) on persons with a unilateral transfemoral amputation (TFA). A randomized crossover design with a 2 d accommodation was used. People with unilateral TFA (n = 9 analyzed) were enrolled. Interventions were IRC VAS and brimless VAS sockets. Main outcome measures included coronal hip angle and vertical and lateral socket movement as measured by X-ray, skin pressure measured by Tekscan, and preference measured subjectively. The brimless design was statistically equivalent to IRC in all measured coronal hip angles and vertical and lateral socket displacement. The peak/stance mean pressure in the medial proximal aspect of the socket was 322 mmHg in the IRC compared with 190 mmHg in the brimless condition. Except for medial proximal pressure, no other measures reached statistical significance. All subjects reported the brimless design to be more comfortable than the IRC in short-term preference. Brimless VAS socket design may be a clinically viable choice for people with TFA. PMID:24458964

  3. Performance enhancement of epoxy based sandwich composites using multiwalled carbon nanotubes for the application of sockets in trans-femoral amputees.

    Science.gov (United States)

    Arun, S; Kanagaraj, S

    2016-06-01

    A socket plays a vital role in giving the comfort to the amputees. However, the accumulation of heat inside the socket and its weight led to increase their metabolic cost. Hence, an attempt was made to increase the performance of the epoxy based sandwich composites to be used for the socket by reinforcing multiwalled carbon nanotubes (MWCNT), which was varied from 0.1 to 0.5wt%. It was homogeneously dispersed in epoxy to obtain the desired properties, where the enhancement of thermal conductivity, compressive strength and modulus of epoxy was observed to be 76.7%, 62.6% and 20.2%, respectively at 0.3wt% of MWCNT concentration beyond which the mechanical properties were found to be decreased. Hence, the epoxy, E-glass plain fabric, 2-10 layers of stockinet and 0.3wt% of MWCNT were used to prepare the sandwich composites. The flexural strength and thermal conductivity of 0.3wt% of MWCNT reinforced sandwich composites were found to be improved by 11.38±1.5% and 29.8±1.3% for the 4-10 layers and up to 10 layers of stockinet, respectively compared to unreinforced sandwich composites, which helped to reduce the weight of the socket and decrease the heat accumulation inside the socket. Thus, it is suggested to be explored for the application of socket in trans-femoral amputees to increase their comfort level by decreasing the metabolic cost. PMID:26736176

  4. Outcomes associated with the use of microprocessor-controlled prosthetic knees among individuals with unilateral transfemoral limb loss: A systematic review

    Directory of Open Access Journals (Sweden)

    Brian J. Hafner, PhD

    2013-05-01

    Full Text Available Microprocessor-controlled prosthetic knees (MPKs have been developed as an alternative to non-microprocessor-controlled knees (NMPKs to address challenges facing individuals with lower-limb loss. A body of scientific literature comparing MPKs and NMPKs exists but has yet to be critically appraised. Therefore, we conducted a systematic review to examine outcomes associated with the use of these interventions among individuals with transfemoral limb loss. A search of biomedical databases identified 241 publications, of which 27 met the inclusion and exclusion criteria and were reviewed for methodological quality and content. We developed 28 empirical evidence statements (EESs in 9 outcome categories (metabolic energy expenditure, activity, cognitive demand, gait mechanics, environmental obstacle negotiation, safety, preference and satisfaction, economics, and health and quality of life based on findings in the literature. The level of evidence supporting these EESs varied due to quantity, quality, and consistency of the results. EESs supported by a moderate level of evidence that noted significant differences between MPKs and NMPKs were derived in five of the nine outcome categories. The results from this review suggest that evidence exists to inform clinical practice and that additional research is needed to confirm existing evidence and better understand outcomes associated with the use of NMPKs and MPKs.

  5. Physical performance and self-report outcomes associated with use of passive, adaptive, and active prosthetic knees in persons with unilateral, transfemoral amputation: Randomized crossover trial

    Directory of Open Access Journals (Sweden)

    Brian J. Hafner, PhD

    2015-09-01

    Full Text Available Prosthetic knees are a vital component in an artificial limb. Contemporary knees include passive (mechanical, adaptive (computerized, or active (motorized control systems and have the potential to mitigate amputation-related functional impairments and activity limitations. A 14 mo randomized crossover trial was conducted. Participants (n = 12, mean age = 58 yr were tested under three conditions: passive control (existing knee, adaptive control (Ossur Rheo Knee II, and active control (Ossur Power Knee II. Training and acclimation time were provided to participants in the adaptive and active knees. Outcome measures included indoor tests (Timed Up and Go test [TUG], stairs, and ramp, outdoor tests (walking course and perceived exertion, step activity monitor, self-report surveys (mobility, balance confidence, physical function, fatigue, and general health, and fall incidence. Mixed-effects linear regression modeling was used to evaluate data. Compared with passive control, adaptive control significantly improved comfortable TUG time (difference = 0.91 s, p = 0.001 and reported physical function (difference = 1.26 [T-score], p = 0.03. Active control significantly increased comfortable TUG, fast TUG, and ramp times (difference = 3.02, 2.66, and 0.96 s, respectively, all p < 0.03 and increased balance confidence (difference = 3.77, p = 0.003 compared with passive control. Findings suggest that adaptive knee control may enhance function compared with passive control but that active control can restrict mobility in middle-age or older users with transfemoral amputation.

  6. Pattern of External Breast Prosthesis Use by Post Mastectomy Breast Cancer Patients in India: Descriptive Study from Tertiary Care Centre.

    Science.gov (United States)

    Ramu, D; Ramesh, Rakesh S; Manjunath, Suraj; Shivakumar; Goel, Vipin; Hemnath, G N; Alexander, Annie

    2015-12-01

    In India, Breast cancer is now the most common cancer in urban and 2nd most common in rural areas [1]. The incidence is rising, more younger women are getting affected and due to increase in survival rates there is an increase in the total number of women suffering from breast Cancer. So far there are no studies evaluating the pattern of breast prosthesis use in Indian scenario. The aim of this study is to address the patterns of external breast prosthesis used in India and view of Indian women on such prosthesis after mastectomy for breast cancer. This was a descriptive longitudinal study. In this study we interviewed (telephonic) 63 people, after three years of completing treatment under The Department of Surgical Oncology, St. Johns medical college, Bangalore. Among the study group, 27 members (40 %) were using various prosthesis, rest 36 women were not using any type of prosthesis. Among the users of prosthesis, silicon prosthesis was used by 6 women, padded cups by 8 women, cloth or cotton by 12 women and 1 woman used other type of prosthesis. Most women use simple items like cloth and cotton (44 %). Next most commonly used prosthesis are padded cups(). Only 22 % of women were found using silicon prosthesis in this study. Most of the well educated patients used external prosthesis either in the form of silicon prosthesis or padded cups. Most of women below age of 50 used external breast prosthesis. Use of prosthesis was more in urban compared to rural population (48 % vs 25 %). Prosthesis users worried more about the body image than women not using prosthesis. 25 % of women using prosthesis had body image issues where as only 5 % of non prosthesis users had such problems. Prosthesis users need improvement in terms of comfort, size, shape and affordability. Most common reasons for not using prosthesis are age, lack of motivation and awareness. Less than half of the women included in this study used external prosthesis after mastectomy for breast cancer

  7. Modelling human exposure to space radiation with different shielding: the FLUKA code coupled with anthropomorphic phantoms

    International Nuclear Information System (INIS)

    Astronauts' exposure to the various components of the space radiation field is of great concern for long-term missions, especially for those in deep space such as a possible travel to Mars. Simulations based on radiation transport/interaction codes coupled with anthropomorphic model phantoms can be of great help in view of risk evaluation and shielding optimisation, which is therefore a crucial issue. The FLUKA Monte Carlo code can be coupled with two types of anthropomorphic phantom (a mathematical model and a 'voxel' model) to calculate organ-averaged absorbed dose, dose equivalent and 'biological' dose under different shielding conditions. Herein the 'biological dose' is represented by the average number of 'Complex Lesions' (CLs) per cell in a given organ. CLs are clustered DNA breaks previously calculated by means of event-by-event track structure simulations at the nm level and integrated on-line into FLUKA, which adopts a condensed-history approach; such lesions have been shown to play a fundamental role in chromosome aberration induction, which in turn can be correlated with carcinogenesis. Examples of calculation results will be presented relative to Galactic Cosmic Rays, as well as to the August 1972 Solar Particle Event. The contributions from primary ions and secondary particles will be shown separately, thus allowing quantification of the role played by nuclear reactions occurring in the shield and in the human body itself. As expected, the SPE doses decrease dramatically with increasing the Al shielding thickness; nuclear reaction products, essentially due to target fragmentation, are of minor importance. A 10 g/cm2 Al shelter resulted to be sufficient to respect the 30-day limits for deterministic effects recommended for missions in Low Earth Orbit. In contrast with the results obtained for SPEs, the calculated GCR doses are almost independent of the Al shield thickness, and the GCR doses to internal organs are not significantly lower than the skin

  8. Femoral hip prosthesis design for Thais using multi-objective shape optimization

    International Nuclear Information System (INIS)

    Highlights: • A multi-objective shape optimization was proposed to design hip prosthesis for Thais. • The prosthesis design was optimized in terms of safety of both cement and prosthesis. • The objective functions used the Soderberg fatigue strength formulations. • Safety factors of the cement and prosthesis are 1.200 and 1.109 respectively. • The newly designed prosthesis also fits well with chosen small-sized Thai femurs. - Abstract: The long-term success of Total Hip Arthroplasty (THA) depends largely on how well the prosthetic components fit the bones. The majority of cemented femoral hip prosthesis failures are due to aseptic loosening, which is possibly caused by cracking of the cement mantle. The strength of cement components is a function of cement mantles having adequate thickness. Since the size and shape of cemented femoral hip prostheses used in Thailand are based on designs for a Caucasian population, they do not properly conform to most Thai patients’ physical requirements. For these reasons, prostheses designed specifically for Thai patients must consider the longevity and functionality of both cement and prosthesis. The objective of this study was to discover a new design for femoral hip prostheses which is not only optimal and safe in terms of both cement and prosthesis, but also fits the selected Thai femur. This study used a small-sized Thai femoral model as a reference model for a new design. Biocompatible stainless steel 316L (SS316L) and polymethylmethacrylate (PMMA) were selected as raw materials for the prosthesis and bone cement respectively. A multi-objective shape optimization program, which is an interface between optimization C program named NSGA-II and a finite element program named ANSYS, was used to optimize longevity of femoral hip prostheses by varying shape parameters at assigned cross-sections of the selected geometry. Maximum walking loads of sixty-kilograms were applied to a finite element model for stress and

  9. Design and manufacturing of anthropomorphic thyroid-neck phantom for use in nuclear medicine centres in Chile.

    Science.gov (United States)

    Hermosilla, A; Díaz Londoño, G; García, M; Ruíz, F; Andrade, P; Pérez, A

    2014-12-01

    Anthropomorphic phantoms are used in nuclear medicine for imaging quality control, calibration of gamma spectrometry system for the study of internal contamination with radionuclides and for internal dosimetric studies. These are constructed of materials that have radiation attenuation coefficients similar to those of the different organs and tissues of the human body. The material usually used for the manufacture of phantoms is polymethyl methacrylate. Other materials used for this purpose are polyethylene, polystyrene and epoxy resin. This project presents the design and manufacture of an anthropomorphic thyroid-neck phantom that includes the cervical spine, trachea and oesophagus, using a polyester resin (ρ = 1.1 g cm(-3)). Its linear and mass attenuation coefficients were experimentally determined and simulated by means of XCOM software, finding that this material reproduces the soft tissue ICRU-44 in a range of energies between 80 keV and 11 MeV, with less than a 5 % difference. PMID:24567500

  10. Procedures of hepatic scintigraphy and improvement of professionals by using anthropomorphic simulator object of liver in nuclear medicine

    International Nuclear Information System (INIS)

    This paper evaluates hepatic scintigraphy procedures and the possibility of professional improvement in nuclear medicine by using three-dimension anthropomorphic simulators representative of adult human liver. For the conformation of anthropomorphic simulator, it was used gypsum and acrylic. Three simulator objects representing cirrhosis livers. The simulator were filled with 99mTc diluted in water for the obtention of scintigraphic images. Tomographic images were analysed posterior and anterior of simulator representing an organ with more cirrhosis grade. It was observed that the simulators make possible the acquisition of images similar to the real images of liver with hepatic cirrhosis. The simulations of hemangiomas can contribute for continuous education of nuclear medicine professionals, as far the question of image formation is concerned, make possible the parameter study as, for example, the , matrix size energy window, zoom and counting statistic

  11. Evaluation of the usefulness of a MOSFET detector in an anthropomorphic phantom for 6-MV photon beam.

    Science.gov (United States)

    Kohno, Ryosuke; Hirano, Eriko; Kitou, Satoshi; Goka, Tomonori; Matsubara, Kana; Kameoka, Satoru; Matsuura, Taeko; Ariji, Takaki; Nishio, Teiji; Kawashima, Mitsuhiko; Ogino, Takashi

    2010-07-01

    In order to evaluate the usefulness of a metal oxide-silicon field-effect transistor (MOSFET) detector as a in vivo dosimeter, we performed in vivo dosimetry using the MOSFET detector with an anthropomorphic phantom. We used the RANDO phantom as an anthropomorphic phantom, and dose measurements were carried out in the abdominal, thoracic, and head and neck regions for simple square field sizes of 10 x 10, 5 x 5, and 3 x 3 cm(2) with a 6-MV photon beam. The dose measured by the MOSFET detector was verified by the dose calculations of the superposition (SP) algorithm in the XiO radiotherapy treatment-planning system. In most cases, the measured doses agreed with the results of the SP algorithm within +/-3%. Our results demonstrated the utility of the MOSFET detector for in vivo dosimetry even in the presence of clinical tissue inhomogeneities. PMID:20821083

  12. [Maxillary prosthesis for better QOL--early setting and faster construction of maxillary prosthesis].

    Science.gov (United States)

    Usui, H; Sakakura, Y; Shimozato, K

    1992-12-01

    The maxillofacial prosthesis (MFP) is well accepted as one of the modalities to ameliolate the postsurgical crippling in the patients with maxillary malignancy. In this report, we analyzed 55 primary cases of MFP out of 100, from July, 1981 to July, 1987 in terms of the time of start after operation, and the duration and procedure of the MFP-making. MFP-making set about within 4 weeks in 35% of patients, 8 weeks in 25%, 12 weeks in 22%, and more than 12 weeks in 18%. The completion of MFP-making averaged 10 days. As a result of simplifying of MFP-making, we shortened a period requiring MFP-making within 3 days in recent 10 cases. There were no adverse effects of early wear of MFP after operation. We believe that early wear of MFP after operation improve the quality of life of patients with maxillary malignancy and considered that wear of MFP is not the completion of treatment, but is one of the procedures of treatment for the patients undergone maxillectomy. PMID:1491275

  13. A survivor of late prosthesis migration and rotation following percutaneous transcatheter aortic valve implantation.

    Science.gov (United States)

    Pang, Philip Y K; Chiam, Paul T L; Chua, Yeow Leng; Sin, Yoong Kong

    2012-05-01

    Transcatheter aortic valve implantation (TAVI) has emerged as a viable alternative endovascular technique in selected patients with severe aortic stenosis, who are either inoperable or at high risk for surgical aortic valve replacement. We report a case of delayed displacement and rotation of an aortic bioprosthesis, 43 days after successful TAVI via the transfemoral approach, with the patient surviving the subsequent open heart surgery required for device retrieval. PMID:22228843

  14. Influence of Manufacturing Process of Warp-knitted Vascular Prosthesis on the Wall Homogeneity

    Institute of Scientific and Technical Information of China (English)

    王璐; 丁辛

    2003-01-01

    This paper reports the evolution of textile structure and mechanical properties of vascular prosthesis in the level of the whole prosthesis and the constituent filaments with respect to the manufacturing process.The tubular wall of the prosthesis is divided circumferentially into three zones: basic line (BL),remeshing line (RL) and guide line (GL). Some heterogeneity has been observed on the tubular wall in :erms of stitch structure of the prosthesis and linear density of the constituent filaments. The breaking position of the prosthesis under circumferential tensile localizes preferentially in remeshing line that is the weakest zone by warp knitting with double needle bed. Furthermore, the statistical differences of the mechanical properties of the filaments of zone RL, GL and BL have been confirmed too. It is predictable that the deterioration of prosthesis, under physiological loads (periodical pulse blood pressure etc.), could happen firstly in the weaker zone in vivo.

  15. Evaluation of iterative reconstruction method and attenuation correction on brain dopamine transporter SPECT using anthropomorphic striatal phantom

    OpenAIRE

    Akira Maebatake; Ayaka Imamura; Yui Kodera; Yasuo Yamashita; Kazuhiko Himuro; Shingo Baba; Kenta Miwa; Masayuki Sasaki

    2016-01-01

    Objective(s): The aim of this study was to determine the optimal reconstruction parameters for iterative reconstruction in different devices and collimators for dopamine transporter (DaT) single-photon emission computed tomography (SPECT). The results were compared between filtered back projection (FBP) and different attenuation correction (AC) methods.Methods: An anthropomorphic striatal phantom was filled with 123I solutions at different striatum-to-background radioactivity ratios. Data wer...

  16. Development of anthropomorphic hand phantoms for personal dosimetry in 90Y-zevalin preparation and patient delivering

    International Nuclear Information System (INIS)

    Anthropomorphic tissue-equivalent hand phantoms were achieved to measure the extremity dose involved in Zevalin 90Y-labelling and patient delivering procedure for radioimmunotherapy treatment of non-Hodgkin lymphoma. The extremity doses to hands and wrists of operators were measured by using thermoluminescent detectors mounted on the developed phantoms. Measurements of chest- and lens-equivalent doses performed on a Rando phantom are also reported. (authors)

  17. Development of anthropomorphic hand phantoms for personal dosimetry in 90Y-Zevalin preparation and patient delivering.

    Science.gov (United States)

    Ciolini, R; d'Errico, F; Traino, A C; Paternostro, E; Laganà, A; Romei, C; Pazzagli, F; Del Gratta, A

    2014-01-01

    Anthropomorphic tissue-equivalent hand phantoms were achieved to measure the extremity dose involved in Zevalin (90)Y-labelling and patient delivering procedure for radioimmunotherapy treatment of non-Hodgkin lymphoma. The extremity doses to hands and wrists of operators were measured by using thermoluminescent detectors mounted on the developed phantoms. Measurements of chest- and lens-equivalent doses performed on a Rando phantom are also reported. PMID:23960242

  18. Evaluation of Sled Tests for Spacecraft Dynamic Environments using the Small Female and Large Male Hybrid III Anthropomorphic Test Devices

    Science.gov (United States)

    Wells, Jessica A.; Somers, Jeffrey T.; Newby, Nathaniel J.; Putnam, Jacob F.; Currie-Gregg, Nancy J.; Lawrence, Charles

    2016-01-01

    Anthropomorphic test devices (ATD) are widely used for military and automotive applications. These ATDs have been correlated to certain types of human injuries largely involving automotive-type energetics and directions of impact. Spacecraft dynamic events involve very different impact characteristics and, in the case of landings, require lower levels of acceptable injury risk due to the certainty of impact occurrence. This test series evaluated the small female and large male Hybrid IIII ATDs for spacecraft dynamic events.

  19. Design of Shape Memory Alloy-Based and Tendon-Driven Actuated Fingers Towards a Hybrid Anthropomorphic Prosthetic Hand

    OpenAIRE

    Erkan Kaplanoglu

    2012-01-01

    This paper presents the design of tendon‐driven actuated fingers using a shape memory alloy for a hybrid anthropomorphic prosthetic hand. The ring and little (pinky) fingers are selected for shape memory activation due to their lower degree of movement during multiple grasping configurations. The fingersʹ tendon system is based on shape memory alloy (SMA) wires that form artificial muscle pairs for the required flexion/extension of the finger joints. The finger has four degrees of freedom suc...

  20. Calculation of dose in anthropomorphic dummies ICRP 110 simulation of protocols overall for a team of 320 sections TC

    International Nuclear Information System (INIS)

    The objective of this study is to carry out, using a program of simulation Monte Carlo, an estimate of the dose received in anthropomorphic mannequins voxelized in tests of four protocols established for the Aquilion ONE General acquiring in conical beam of 320 X 0, 5 mm. Finally, will be obtained factors of conversion between values of product dose (DLP) length and effective doses for each protocol. (Author)

  1. The method of manufacture of nylon dental partially removable prosthesis using additive technologies

    Science.gov (United States)

    Kashapov, R. N.; Korobkina, A. I.; Platonov, E. V.; Saleeva, G. T.

    2014-12-01

    The article is devoted to the topic of creating new methods of dental prosthesis. The aim of this work is to investigate the possibility of using additive technology to create nylon prosthesis. As a result of experimental studies, was made a sample of nylon partially removable prosthesis using 3D printing has allowed to simplify, accelerate and reduce the coat of manufacturing high-precision nylon dentures.

  2. False-positive indium-111 labeled leukocyte scintigram in a patient with a painful hip prosthesis

    International Nuclear Information System (INIS)

    A Tronzo hip prosthesis is designed to elicit an inflammatory reaction in order to promote prosthesis stability. A three-phased bone scan and Ga-67 imaging in conjunction with physical examination and laboratory findings failed to demonstrate evidence for osteomyelitis in a patient with a painful hip prosthesis, in whom images obtained with In-111-labeled leukocytes were positive. This observation demonstrated that the interpretation of the latter technique in demonstrating inflammation can cause a false impression of an infectious process

  3. Magnetic resonance imaging compatibility test of a cranial prosthesis with titanium screws

    Science.gov (United States)

    Jimenez, R.; Benavides, A.; Flores, D.; Hidalgo, S. S.; Solis, S. E.; Uribe, E.; Rodriguez, A. O.

    2012-10-01

    The follow-up of patients with skull prosthesis is necessary to provide adequate medical care. Skull prostheses for cranioplasty have been developed at the Faculty of Odontology of Universidad Nacional Autonoma de Mexico. We built a skull prosthesis phantom and tested for compatibility with standard magnetic resonance imaging procedures. Results showed full compatibility but susceptibility artefacts occurred due to titanium used to fix the prosthesis to the skull.

  4. The Efficiency of Titanium Middle Ear Prosthesis in Ossicular Chain Reconstruction: Our Experience

    OpenAIRE

    Shah, Kshitij Dhaval; Bradoo, Renuka A.; Joshi, Anagha A.; Sapkale, Deepti D.

    2011-01-01

    Middle ear ossicular reconstruction is a challenging task for any otologist. Over a period of time, surgeons have tried various types of materials as ossicular prosthesis with varying amount of success. In the last decade, numerous studies have been conducted that have proved that titanium prosthesis is biocompatible. We have conducted this study to investigate the efficiency of titanium middle ear prosthesis (Eon Meditech Pvt. Ltd.) in tympanoplasty. Nineteen patients who underwent tympanopl...

  5. Septic failure is not a septic loosening: A case report of a failed shoulder prosthesis

    OpenAIRE

    Yde Engelsma; Pieter Buma; Pieter C Geervliet; Arthur Van Noort

    2012-01-01

    Septic failure of a shoulder arthroplasty due to a low-grade infection is generally called septic loosening. However, it is often not investigated if a prosthesis is genuinely loose. We present a case of a failed resurfacing prosthesis in a 70-year-old woman. This prosthesis failed due to a low-grade infection and a revision procedure was mandatory. All intraoperative cultures were positive and revealed a combination of bacteria. Nevertheless, histology revealed a macroscopic and a microscopi...

  6. Axial penile rigidity influences patient and partner satisfaction after penile prosthesis implantation

    OpenAIRE

    Abdulla Al Ansari; Raidh A. Talib; Onder Canguven; Ahmad Shamsodini

    2013-01-01

    Introduction: Penile prosthesis implantation is one of the treatment choices that is kept for patients who were not satisfied with other treatments. Although penile prosthesis satisfaction rates are higher, there are some dissatisfied patients. The patients’ reasons are mostly shortness and softness of implanted prosthesis. It was previously demonstrated that penile axial rigidity of more than 500 grams is enough for successful vaginal intromission. To our knowledge, there is no study c...

  7. Management of long span partially edentulous maxilla with fixed removable denture prosthesis

    OpenAIRE

    Jeyavalan, Mahilan I.; M Narasimman; Venkatakrishnan, C. J.; M Philip Jacob

    2012-01-01

    Restoration of a long span partially edentulous maxilla with tooth supported prosthesis is challenging because of inherent anatomic limitations and unfavourable biomechanics present after the loss of teeth. A tooth supported fixed-removable prosthesis is a treatment option for restoration of such long span partially edentulous maxillary arches. This prosthesis meets the requirements for esthetics, phonetics, comfort, and hygiene, as well as favourable biomechanical stress distribution to the ...

  8. Manipulation of Non-verbal Interaction Style and Demographic Embodiment to Increase Anthropomorphic Computer Character Credibility

    Energy Technology Data Exchange (ETDEWEB)

    Cowell, Andrew J.; Stanney, Kay M.

    2005-02-01

    For years, people have sought more natural means of communicating with their computers. Many have suggested that interaction with a computer should be as easy as interacting with other people, taking advantage of the multimodal nature of human communication. While users should, in theory, gravitate to such anthropomorphic embodiments, quite the contrary has been experienced; users generally have been dissatisfied and abandoned their use. This suggests a disconnect between the factors that make human-human communication engaging and those used by designers to support human-agent interaction. This paper discusses a set of empirical studies that attempted to replicate human-human nonverbal behavior. The focus revolved around the behaviors that portrayed a credible façade, helping the embodied conversational agent (ECA) to form a successful cooperative dyad with the user. Based on a review of the nonverbal literature, a framework was created that identified trustworthy and credible nonverbal behaviors across five areas and formed design guidelines for character interaction. The design suggestions for those areas emanating from the facial region (facial expression, eye contact and paralanguage) were experimentally supported but there was no concordant increase in perceived trust when bodily regions (posture and gesture) were added. In addition, in examining the importance of demographic elements in the embodiment, it was found that users prefer to interact with characters that match their ethnicity and are young looking. There was no significant preference for gender. The implications of these results, as well as other interesting consequences are discussed.

  9. Verification of lung dose in an anthropomorphic phantom calculated by the collapsed cone convolution method

    International Nuclear Information System (INIS)

    Verification of calculated lung dose in an anthropomorphic phantom is performed using two dosimetry media. Dosimetry is complicated by factors such as variations in density at slice interfaces and appropriate position on CT scanning slice to accommodate these factors. Dose in lung for a 6 MV and 10 MV anterior-posterior field was calculated with a collapsed cone convolution method using an ADAC Pinnacle, 3D planning system. Up to 5% variations between doses calculated at the centre and near the edge of the 2 cm phantom slice positioned at the beam central axis were seen, due to the composition of each phantom slice. Validation of dose was performed with LiF thermoluminescent dosimeters (TLDs) and X-Omat V radiographic film. Both dosimetry media produced dose results which agreed closely with calculated results nearest their physical positioning in the phantom. The collapsed cone convolution method accurately calculates dose within inhomogeneous lung regions at 6 MV and 10 MV x-ray energy. (author)

  10. Long-term dose measurements applying a human anthropomorphic phantom onboard an aircraft

    International Nuclear Information System (INIS)

    The exposure of aircrew personnel to cosmic radiation has been considered as occupational exposure in the European Union since the European Council Directive 96/26/EURATOM became effective on 13th May 1996. In Germany the corresponding safety standards for aircrew are regulated by the German Radiation Protection Ordinance, which implemented the European law in 2001. The radiation exposure of the flight crew of the LUFTHANSA group is calculated by the DLR Institute of Aerospace Medicine in Cologne, applying the calculation program EPCARD in the framework of the aircrew dose determination system CALculated and Verified Aviation DOSimetry (CALVADOS). Besides the operational dose calculations, DLR performs measurements at airflight altitudes using active (e.g. TEPC, DOSTEL, etc.) and passive (Thermoluminescence detectors (TLDs), bubble detectors) radiation detectors to verify the calculation codes. Within these activities the project BOdy DOsimetry (BODO) comprised a long-term exposure of a RANDO anthropomorphic phantom to measure the skin and the depth dose distribution inside a human torso applying TLDs at aviation altitudes for the first time. The torso was flown onboard a LUFTHANSA Cargo aircraft for 3 months from mid of July to mid of October 2004. Over 800 TLDs were positioned for depth dose measurements in the head, the thorax and the abdomen of the torso. In addition dosemeter packages have been distributed on the surface of the torso to measure the skin dose as well as in the transport container and on the flight deck

  11. Development of an Anthropomorphic Robotic Arm and Hand for Interactive Humanoids

    Institute of Scientific and Technical Information of China (English)

    Jamie K. Paik; Bu Hyun Shin; Young-bong Bang; Young-Bo Shim

    2012-01-01

    Humanoid robots are designed and built to mimic human form and movement.Ultimately,they are meant to resemble the size and physical abilities of a human in order to function in human-oriented environments and to work autonomously but to pose no physical threat to humans.Here,a humanoid robot that resembles a human in appearance and movement is built using powerful actuators paired with gear trains,joint mechanisms,and motor drivers that are all encased in a package no larger than that of the human physique.In this paper,we propose the construction of a humanoid-applicable anthropomorphic 7-DoF arm complete with an 8-DoF hand.The novel mechanical design of this humanoid arm makes it sufficiently compact to be compatible with currently available narrating-model humanoids,and to be sufficiently powerful and flexible to be functional; the number of degrees of freedom endowed in this robotic arm is sufficient for executing a wide range of tasks,including dexterous hand movements.The developed humanoid arm and hand are capable of sensing and interpreting incoming external force using the motor in each joint current without conventional torque sensors.The humanoid arm adopts an algorithm to avoid obstacles and the dexterous hand is capable of grasping objects.The developed robotic arm is suitable for use in an interactive humanoid robot.

  12. Exposures in interventional radiology using Monte Carlo simulation coupled with virtual anthropomorphic phantoms.

    Science.gov (United States)

    Santos, William S; Neves, Lucio P; Perini, Ana P; Belinato, Walmir; Caldas, Linda V E; Carvalho, Albérico B; Maia, Ana F

    2015-12-01

    In this work we investigated the way in which conversion coefficients from air kerma-area product for effective doses (CCE) and entrance skin doses (CCESD) in interventional radiology (IR) are affected by variations in the filtration, projection angle of the X-ray beam, lead curtain attached to the surgical table, and suspended shield lead glass in regular conditions of medical practice. Computer simulations were used to model an exposure scenario similar to a real IR room. The patient and the physician were represented by MASH virtual anthropomorphic phantoms, inserted in the MCNPX 2.7.0 radiation transport code. In all cases, the addition of copper filtration also increased the CCE and CCESD values. The highest CCE values were obtained for lateral, cranial and caudal projections. In these projections, the X-ray tube was located above the table, and more scattered radiation reached the middle and upper portions of the physician trunk, where most of the radiosensitive organs are located. Another important result of this study was to show that the physician's protection is 358% higher when the lead curtain and suspended shield lead glasses are used. The values of CCE and CCESD, presented in this study, are an important resource for calculation of effective doses and entrance skin doses in clinical practice. PMID:26160701

  13. Optimization of a protocol for myocardial perfusion scintigraphy by using an anthropomorphic phantom

    Energy Technology Data Exchange (ETDEWEB)

    Ramos, Susie Medeiros Oliveira; Sa, Lidia Vasconcellos de, E-mail: susie@ird.gov.br [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Glavam, Adriana Pereira; Kubo, Tadeu Takao Almodovar [Clinica de Diagnostico Por Imagem (CDPI/DASA), Rio de Janeiro, RJ (Brazil)

    2014-07-15

    Objective: to develop a study aiming at optimizing myocardial perfusion imaging. Materials and Methods: imaging of an anthropomorphic thorax phantom with a GE SPECT Ventri gamma camera, with varied activities and acquisition times, in order to evaluate the influence of these parameters on the quality of the reconstructed medical images. The {sup 99m}Tc-sestamibi radiotracer was utilized, and then the images were clinically evaluated on the basis of data such as summed stress score, and on the technical image quality and perfusion. The software ImageJ was utilized in the data quantification. Results: the results demonstrated that for the standard acquisition time utilized in the procedure (15 seconds per angle), the injected activity could be reduced by 33.34%. Additionally, even if the standard scan time is reduced by 53.34% (7 seconds per angle), the standard injected activity could still be reduced by 16.67%, without impairing the image quality and the diagnostic reliability. Conclusion: the described method and respective results provide a basis for the development of a clinical trial of patients in an optimized protocol. (author)

  14. Use of MOSFET dosimeters to validate Monte Carlo radiation treatment calculation in an anthropomorphic phantom

    Science.gov (United States)

    Juste, Belén; Miró, R.; Abella, V.; Santos, A.; Verdú, Gumersindo

    2015-11-01

    Radiation therapy treatment planning based on Monte Carlo simulation provide a very accurate dose calculation compared to deterministic systems. Nowadays, Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) dosimeters are increasingly utilized in radiation therapy to verify the received dose by patients. In the present work, we have used the MCNP6 (Monte Carlo N-Particle transport code) to simulate the irradiation of an anthropomorphic phantom (RANDO) with a medical linear accelerator. The detailed model of the Elekta Precise multileaf collimator using a 6 MeV photon beam was designed and validated by means of different beam sizes and shapes in previous works. To include in the simulation the RANDO phantom geometry a set of Computer Tomography images of the phantom was obtained and formatted. The slices are input in PLUNC software, which performs the segmentation by defining anatomical structures and a Matlab algorithm writes the phantom information in MCNP6 input deck format. The simulation was verified and therefore the phantom model and irradiation was validated throughout the comparison of High-Sensitivity MOSFET dosimeter (Best medical Canada) measurements in different points inside the phantom with simulation results. On-line Wireless MOSFET provide dose estimation in the extremely thin sensitive volume, so a meticulous and accurate validation has been performed. The comparison show good agreement between the MOSFET measurements and the Monte Carlo calculations, confirming the validity of the developed procedure to include patients CT in simulations and approving the use of Monte Carlo simulations as an accurate therapy treatment plan.

  15. Comparison of various anthropomorphic phantom types for in vivo measurements by means of Monte Carlo simulations

    International Nuclear Information System (INIS)

    Three widely used anthropomorphic phantoms are analysed with regard to their suitability for the efficiency calibration of whole-body counters (WBCs): a Bottle Manikin Absorber (BOMAB) phantom consisting of water-filled plastic containers, a St Petersburg block phantom (Research Inst. of Sea Transport Hygiene, St Petersburg) made of polyethylene bricks and a mathematical Medical Internal Radiation Dose (MIRD) phantom, each of them representing a person weighing 70 kg. The analysis was performed by means of Monte Carlo simulations with the Monte Carlo N-Particle transport code using detailed mathematical models of the phantoms and the WBC at Forschungszentrum Juelich (FZJ). The simulated peak efficiencies for the BOMAB phantom and the MIRD phantom agree very well, but the results for the St Petersburg phantom are considerably higher. Therefore, WBCs similar to that at FZJ will probably underestimate the activity of incorporated radionuclides if they are calibrated by means of a St Petersburg phantom. Finally, the results from this work are compared with the conclusions from other studies dealing with block and BOMAB phantoms. (authors)

  16. Small anthropomorphic figurines in clay at Ģipka Neolithic settlements

    Directory of Open Access Journals (Sweden)

    Ilze Biruta Loze

    2005-12-01

    Full Text Available Miniature Neolithic figurines in clay are a special topic of research. This especially concerns areas where their representation has so far been poor. While carrying out archaeological excavations in Northern Kurzeme, the north-west coastal dune zone of Rīga Bay, a ritual-like complex was recovered at Ģipka A site belonging to the local Culture of Pit Ceramics. It consists of several large and smaller fireplaces and pits, with the finds of fragmentary clay figurines recovered under the palisade that surrounded the settlement. The head and body of the miniature anthropomorphic figurines in clay have original modelling. It is possible to single out two types of figurine: with rather broad cheekbones, and oval modelling of face. The large amount of ochre found in the settlement and the purposeful breaking of figurines are evidence of their role during a rite. Clay figurines have a symbolic meaning, and the signs depicted on them, incised walking stick-shape and other motifs, are the symbols of early farmers.

  17. Optimising radiographic bitewing examination to adult and juvenile patients through the use of anthropomorphic phantoms

    International Nuclear Information System (INIS)

    Four anthropomorphic phantoms (an adult male, an adult female, a 10-y-old child and a 5-y-old child) were exposed to bitewing radiographs at film and digital settings using both rectangular and round collimation. Optically stimulated dosemeters were used. For children, average organ doses were <40 μGy and the organs with the highest doses were the salivary glands, parotid, oral mucosa, skin and extrathoracic airway. For adults, average organ doses were <200 μGy. Highest adult doses were to the salivary glands, oral mucosa and skin. Effective doses ranged from 1.5 to 1.8 μSv for children and from 2.6 to 3.6 μSv for adults when optimised technique factors were employed, including digital receptors, rectangular collimation, size-appropriate exposure times and proper clinical judgment. Optimised doses were a fraction of the natural daily background exposure. Therefore, predictions of hypothetical cancer incidence or detriment in patient populations exposed to such low doses are highly speculative and should be discouraged. (authors)

  18. Assessing heterogeneity correction algorithms using the Radiological Physics Center's anthropomorphic thorax phantom

    International Nuclear Information System (INIS)

    The Radiological Physics Center (RPC) was established as a resource in radiation dosimetry and physics for cooperative clinical trial groups and radiotherapy facilities that deliver radiation treatments to patients entered onto cooperative group protocols. The RPC's primary responsibility is to assure NCI and the cooperative groups that the participating institutions deliver radiation treatments that are clinically comparable to those delivered by other institutions in the cooperative groups. One of the remote audit techniques used by the RPC to assure NCI is to credential institutions using its anthropomorphic phantoms, i.e. an end to end test from imaging to planning to final dose delivery as if the phantom were an actual patient. With the recent the implementation of several lung protocols requiring heterogeneity corrected target doses, the RPC, through its credentialing activities have evaluated numerous heterogeneity correction algorithms as used in various treatment planning systems. These systems include Elekta Pinnacle superposition convolution (SC) (adaptive convolve and collapsed cone) algorithms, Varian Eclipse pencil beam (PB) and AAA algorithms, TomoTherapy planning station SC, Accuray Multiplan PB and Monte Carlo (MC) algorithms, Nomos Corvus PB, CMS XiO SC, BrainLab PB and Elekta PrecisePlan Clarkson algorithm

  19. An anthropomorphic sonography phantom for the evaluation of mechatronic devices for heart surgery.

    Science.gov (United States)

    Korb, Werner; Fricke, Christopher; Jacobs, Stephan; Falk, Volkmar

    2015-12-01

    Surgical assistance systems are used to make surgical procedures more precise. The integration of automated intra-operative imaging in surgical interventions can be seen as an important step to further improve patient safety. An automatic soft tissue manipulation system with mechatronic assistance using endoscopic Doppler guidance was developed for minimally invasive coronary artery bypass surgery. To facilitate the complicated development process of the mechatronic system, we manufactured and validated an anthropomorphic phantom. A three-compartment model including soft tissue and a vessel system were manufactured for the phantom. Blood flow simulation was implemented using a pump and blood mimicking fluid in a closed circuit. Eighteen physicians evaluated the anatomical and physiological validity of the phantom in a study. The average rating of the anatomy, as well as the physiology, was good, although particular aspects of the phantom have shown a need for improvement. The validation study provided valuable information on limits and problems concerning the phantom and its applicability for the evaluation of the development steps of the mechatronic system. We showed how to develop and validate a phantom for the evaluation of a surgical assistance system with intraoperative imaging. The described concepts can be applied to similar developmental procedures and help generate a goal-driven and efficient development. PMID:25870954

  20. Calcium scoring with dual-energy CT in men and women: an anthropomorphic phantom study

    Science.gov (United States)

    Li, Qin; Liu, Songtao; Myers, Kyle; Gavrielides, Marios A.; Zeng, Rongping; Sahiner, Berkman; Petrick, Nicholas

    2016-03-01

    This work aimed to quantify and compare the potential impact of gender differences on coronary artery calcium scoring with dual-energy CT. An anthropomorphic thorax phantom with four synthetic heart vessels (diameter 3-4.5 mm: female/male left main and left circumflex artery) were scanned with and without female breast plates. Ten repeat scans were acquired in both single- and dual-energy modes and reconstructed at six reconstruction settings: two slice thicknesses (3 mm, 0.6 mm) and three reconstruction algorithms (FBP, IR3, IR5). Agatston and calcium volume scores were estimated from the reconstructed data using a segmentation-based approach. Total calcium score (summation of four vessels), and male/female calcium scores (summation of male/female vessels scanned in phantom without/with breast plates) were calculated accordingly. Both Agatston and calcium volume scores were found comparable between single- and dual-energy scans (Pearson r= 0.99, pimaging protocols for improved gender-specific calcium scoring.

  1. Anthropomorphic models for the calibration of equipment for in vivo neutron activation analysis

    International Nuclear Information System (INIS)

    At present each laboratory performing chemical analysis in vivo calibrates its equipment with home-made anthropomorphic models containing the elements of interest. These models are of varying construction, usually contain only one element at a time, and often approximate poorly to human anatomy and its variation. To improve on this state of affairs the author has constructed 3 models of the human body of different sizes. Miss Small and Mr. Average are made up of circular or elliptic cylinders with walls of Polythene, polypropylene or Perspex. Mr. Big is modeled on an actual person and is made of transparent plastic. The bony skeletons are Perspex tubes filled with various chemicals, mainly calcium phosphate. The tibias of Mr. Average contained lead. The bony anatomy is severely simplified; for example, the ribs run longitudinally and the lower legs and arms contain only a single bone in each. Each model contains thyroid, lungs, liver and kidneys. Thyroids contain only iodine. Lungs have densities of about 0.3 and Miss Small's lungs contain silicon. Measurements can be made either of total body contents or of the quantities of trace elements in individual organs

  2. Dose evaluation in occupationally exposed workers through dosimeters ring and wrist type with an anthropomorphic phantom

    International Nuclear Information System (INIS)

    In the Nuclear Medicine service of the Clinica San Pablo (Peru), the occupationally exposed workers carried out the preparation and administration of radiopharmaceuticals to patients, so it is vital to measure the equivalent dose to the hands during the procedures in order to optimize the exposure to the ionizing radiation and execute the Radiological Safety Regulation (D.S. No. 009-97-Em) and the standard IR 002.2012 of radiation protection and safety in nuclear medicine. In this paper was designed and built a hand anthropomorphic phantom made of paraffin following the description given for the standard man, later were placed dosimeters ring and wrist type UD-807 model, Panasonic brand. Then we proceeded to irradiate using vial containers of Tc-99 and I-131. The obtained results showed the difference between the equivalent dose obtained among the ring and wrist dosimeter also getting a dose of 153 mSv /year when working with 99mTc and of 61 mSv /year when working with iodine-131. Was also demonstrated that the ring dosimeter shows the average dose received in the hand with less dispersion. It was found that under the national regulation on Requirements of Radiation Protection and Nuclear Safety in Medicine article 63, indicates that higher doses of 150 mSv /year the occupationally exposed workers should have hand dosimetry. Finally the individual dose limit of 500 mSv /year in extremities can be overcome if adequate radiation protection standards do not apply. (author)

  3. Novel anthropomorphic hip phantom corrects systemic interscanner differences in proximal femoral vBMD

    International Nuclear Information System (INIS)

    Quantitative computed tomography (QCT) is increasingly used in osteoporosis studies to assess volumetric bone mineral density (vBMD), bone quality and strength. However, QCT is confronted by technical issues in the clinical research setting, such as potentially confounding effects of body size on vBMD measurements and lack of standard approaches to scanner cross-calibration, which affects measurements of vBMD in multicenter settings. In this study, we addressed systematic inter-scanner differences and subject-dependent body size errors using a novel anthropomorphic hip phantom, containing a calibration hip to estimate correction equations, and a contralateral test hip to assess the quality of the correction. We scanned this phantom on four different scanners and we applied phantom-derived corrections to in vivo images of 16 postmenopausal women scanned on two scanners. From the phantom study, we found that vBMD decreased with increasing phantom size in three of four scanners and that inter-scanner variations increased with increasing phantom size. In the in vivo study, we observed that inter-scanner corrections reduced systematic inter-scanner mean vBMD differences but that the inter-scanner precision error was still larger than expected from known intra-scanner precision measurements. In conclusion, inter-scanner corrections and body size influence should be considered when measuring vBMD from QCT images. (paper)

  4. In vivo proton dosimetry using a MOSFET detector in an anthropomorphic phantom with tissue inhomogeneity.

    Science.gov (United States)

    Kohno, Ryosuke; Hotta, Kenji; Matsubara, Kana; Nishioka, Shie; Matsuura, Taeko; Kawashima, Mitsuhiko

    2012-01-01

    When in vivo proton dosimetry is performed with a metal-oxide semiconductor field-effect transistor (MOSFET) detector, the response of the detector depends strongly on the linear energy transfer. The present study reports a practical method to correct the MOSFET response for linear energy transfer dependence by using a simplified Monte Carlo dose calculation method (SMC). A depth-output curve for a mono-energetic proton beam in polyethylene was measured with the MOSFET detector. This curve was used to calculate MOSFET output distributions with the SMC (SMC(MOSFET)). The SMC(MOSFET) output value at an arbitrary point was compared with the value obtained by the conventional SMC(PPIC), which calculates proton dose distributions by using the depth-dose curve determined by a parallel-plate ionization chamber (PPIC). The ratio of the two values was used to calculate the correction factor of the MOSFET response at an arbitrary point. The dose obtained by the MOSFET detector was determined from the product of the correction factor and the MOSFET raw dose. When in vivo proton dosimetry was performed with the MOSFET detector in an anthropomorphic phantom, the corrected MOSFET doses agreed with the SMC(PPIC) results within the measurement error. To our knowledge, this is the first report of successful in vivo proton dosimetry with a MOSFET detector. PMID:22402385

  5. Management of infected custom mega prosthesis by Ilizarov method

    Directory of Open Access Journals (Sweden)

    Karthik Gudaru

    2015-12-01

    Full Text Available A 26 year old male patient with an aggressive giant cell tumour of the left distal femur was managed by wide excision and insertion of custom mega prosthesis. Patient developed deep infection which did not subside with multiple debridements and antibiotics. Hence the custom mega prosthesis was removed and the bone gap was managed by Ilizarov method. Ilizarov fixation of the left femur and tibia was done. Femoral and tibial corticotomy was done and the bone segments were transported towards the knee to finally achieve a knee arthrodesis. The case illustrates the method and difficulties encountered during the treatment. [Int J Res Med Sci 2015; 3(12.000: 3874-3878

  6. [Effect of prosthesis cleansing agent on the prosthetic base fungi].

    Science.gov (United States)

    Temmer, K; Stipetić, D; Cekić-Arambasin, A; Kraljević, K

    1991-01-01

    Candida albicans and other fungi are frequently found in subjects wearing prostheses, especially in prostheses with poor hygiene, i.e. with accumulations of food, plaques and calculi. The aim of this study was to assess the efficacy of Corega extradent relative to fungi adhering to the prosthetic base. Results of the study showed the prosthesis hygiene to be substantially related to inflammation of palatal mucosa. The mean number of fungi per sq.cm of prosthetic base was 64 x 10(5). The number of fungi was redetermined after a two-day treatment with Corega extradent, with unchanged other habits of the prosthesis wearing and cleansing. The number of fungi decreased in all study subjects, the mean value of individual differences being 2238 times. In prostheses with a great number of fungi and extremely poor hygiene, the effect of Corega extradent was poorer, indicating the need of additional mechanical cleansing with a brush. PMID:1819938

  7. Research and development of a versatile portable speech prosthesis

    Science.gov (United States)

    1981-01-01

    The Versatile Portable Speech Prosthesis (VPSP), a synthetic speech output communication aid for non-speaking people is described. It was intended initially for severely physically limited people with cerebral palsy who are in electric wheelchairs. Hence, it was designed to be placed on a wheelchair and powered from a wheelchair battery. It can easily be separated from the wheelchair. The VPSP is versatile because it is designed to accept any means of single switch, multiple switch, or keyboard control which physically limited people have the ability to use. It is portable because it is mounted on and can go with the electric wheelchair. It is a speech prosthesis, obviously, because it speaks with a synthetic voice for people unable to speak with their own voices. Both hardware and software are described.

  8. Hip arthroplasty. Part 1: prosthesis terminology and classification

    International Nuclear Information System (INIS)

    Hip arthroplasty is an extremely common orthopaedic procedure and there is a wide array of implants that are in current use in the UK. The follow-up of patients who have undergone insertion of a hip prosthesis is shifting from a consultant-lead hospital service towards primary care. As this change in patient care continues it becomes increasingly important that an accurate description of the radiographic features is communicated to the primary-care practitioner so appropriate specialist input can be triggered. This review focuses on the terminology and classification of hip prostheses. This acts as a precursor for Part 2 of this series, which describes the normal and abnormal radiographic findings following hip prosthesis insertion.

  9. Modified prosthesis for the treatment of malignant esophagotracheal fistula

    International Nuclear Information System (INIS)

    Esophagotracheal fistula is usually a sequela of irradiation or laser treatment of advanced carcinoma of the esophagus or the tracheobronchial tree. Resection of the tumor in these cases is not possible, and palliative bypass surgery is highly risky. The peroral placement of a prosthesis is less invasive, but conventional prostheses often fail to occlude the fistula. The authors regularly use an endoscopic multiple-diameter bougie for dilation. After dilation, a specially designed prosthesis is pushed through the tumor stenosis to block the fistula. This procedure can be done without general anesthesia. The funnels of conventional prostheses cannot cover the fistula when there is either a wide, proximal esophagus above the fistula or a high fistula. To cope with this particular situation, a special fistula funnel was developed. It perfectly occludes the fistulas in all patients. Of 21 patients, 19 were discharged without further aspiration

  10. Tridimensional Treatment Planning and Rapid Prototyping for Maxillofacial Prosthesis

    Institute of Scientific and Technical Information of China (English)

    ZHANGWen-qiang; YUANJian-bing; YEMing; HUANGXue-mei; WANGCheng-tao

    2004-01-01

    The currert stmulation planing systmes for maxillofacial prosthesis surgery were used to extrapolate 3D surgical movements and outcomes based on the 2D radiographs,which were inadequate for complex surgical movements A 3D treatmenl planning system based on the computerized tomography(CT)data was presented A 3D data field was costructed out of the sectional image stack through linear interpolation after objectire tissue segmentation and using the marching cubes algorithm method,the triangular mesh model and 3D geometric model of diseased facial skeleton were reconstructed then the model was cut,the segments were moved or totated to their predicted positions,and angles and distances were measured after triangular mesh model was decimaled a RP model was manufactured for surgical simulation and prosthesis design The system was used in clinic with more than fifty cases and technically wilidated with success.

  11. Femoral prosthesis subsidence in asymptomatic patients. A stereophotogrammetric assessment.

    Science.gov (United States)

    Chafetz, N; Baumrind, S; Murray, W R; Genant, H K

    1984-01-01

    A radiographic stereophotogrammetric technique (SPG) was used to evaluate quantitatively the presence of early femoral prosthesis subsidence after total hip arthroplasty (THA). This paper focuses on the measurement of subsidence in 12 patients who remained asymptomatic during the first two years after surgery. Only one of these had SPG estimated subsidence in excess of one millimeter at any timepoint. These findings are consistent with the conclusion that early postoperative subsidence is not a common finding among asymptomatic THA patients. PMID:6469528

  12. Malignant esophageal stenosis: treatment with the Wallsten ''TM prosthesis

    International Nuclear Information System (INIS)

    To discuss the technical aspects and adders the clinical results of treatment of malignant esophaged dysphagia by placement of a Wallstent prosthesis under fluoroscopic guidance. Over the past six years, we have implanted 63 Wallstent metallic prostheses in 40 patients with un operable malignant dysphagia of esophaged origin. The consisted of 36 men and 6 women with a mean age of 72 years. Seven of the neoplasms were associated with fistula.Six involved recurrent tumors at the point of the surgical anastomosis. Following implantation, the patients were evaluated clinically and radiologically at postoperative hour 48 and periodically thereafter until their death or until the study was completed in September 1996. The placement of the prostheses was achieved in all the patients. Immediate technical problems (malposition or failure to expand) in 27.5% of cases. Forty percent of the patients complained of plain, and there was one death due to massive hematemesis. A clear improvement in dysphagia was obtained was obtained in 79% of and only one of the 7 fistulas was closed. During follow-up, the main complication was obstruction of prosthesis (25%) as a result of tumor overgrowth (9 episodes in 8 patients) or due to food impaction (4 episodes in 3 patients). The rate of retreatment was 27.5%. The mean survival time after prosthesis implantation was 132 ±207 days and 62.5% of the devices were still permeable when the patient died. Implantation of Wallstent prosthesis in cases of malignant esophageal stenosis is easy and safe, and constitutes an effective treatment of dysphagia. Nevertheless, thorough knowledge of the technical aspects ensures better results and the strict assessment of the indications guarantees an improved cost-benefit ratio for this technique. (Author) 23 refs

  13. Five-year practice of roentgenoendovascularly replacing a nitinol prosthesis

    International Nuclear Information System (INIS)

    Roentgenoendovascular prosthesis hat been made in 103 patients, 121 endoprosthesis implantations, into the ileac, femoral, and popliteal arteries over 5 years, 76.8 % pf the patients had a severe concurrent disease. The age of the patients ranged from 21 to 72 years. Positive results were obtained in 93.7 % of all the implantations. Poor results were obtained with endoprosthesis of the superficial femoral and popliteal arteries, which were associated with impaired distal limb blood flow. Indications for endoprosthesis were defined

  14. Cochlear implantation: a biomechanical prosthesis for hearing loss

    OpenAIRE

    Yawn, Robert; Hunter, Jacob B.; Sweeney, Alex D.; Bennett, Marc L.

    2015-01-01

    Cochlear implants are a medical prosthesis used to treat sensorineural deafness, and one of the greatest advances in modern medicine. The following article is an overview of cochlear implant technology. The history of cochlear implantation and the development of modern implant technology will be discussed, as well as current surgical techniques. Research regarding expansion of candidacy, hearing preservation cochlear implantation, and implantation for unilateral deafness are described. Lastly...

  15. Visual Prosthesis for Macular Degeneration And Retinistis Pigmentosa

    OpenAIRE

    Shweta Gupta; Shashi Kumar Singh; V.K. Dwivedi

    2014-01-01

    Abstract: This paper incorporates majorly visual prosthesis that results in electronic solution such as bionic eye for the disease macular degeneration and retinitis pigmentosa. Both diseases damage the eyes’ photoreceptors, the cells at the back of the retina that perceive light patterns and pass them on to the brain in the form of nerve impulses, where the impulse patterns are then interpreted as images. The Argus II system takes the place of these photoreceptors. In the past 20 years, biot...

  16. Transcatheter aortic valve prosthesis surgically replaced 4 months after implantation

    DEFF Research Database (Denmark)

    Thyregod, Hans Gustav; Lund, Jens Teglgaard; Engstrøm, Thomas;

    2010-01-01

    Transcatheter aortic valve implantation is a new and rapidly evolving treatment option for high-risk surgical patients with degenerative aortic valve stenosis. Long-term results with these new valve prostheses are lacking, and potential valve dysfunction and failure would require valve replacemen....... We report the first case of surgical valve replacement in a patient with a dysfunctional transcatheter-implanted aortic valve prosthesis 4 months after implantation....

  17. Mechanical design and control of a new myoelectric hand prosthesis

    OpenAIRE

    Peerdeman, B.; Stramigioli, S.; Hekman, E.; Brouwer, D.M.; Misra, S

    2011-01-01

    The development of modern, myoelectrically controlled hand prostheses can be difficult, due to the many requirements its mechanical design and control system need to fulfill [1]. The hand should be controllable with few input signals, while being able to perform a wide range of motions. It should be lightweight and slim, but be able to actuate all fingers separately. To accomplish this, new control and mechanical design techniques are implemented in a modern hand prosthesis prototype.

  18. Literature review on needs of upper limb prosthesis users

    OpenAIRE

    Francesca Cordella; Anna Lisa Ciancio; Rinaldo Sacchetti; Angelo Davalli; Andrea Cutti; Eugenio Guglielmelli; Loredana Zollo

    2016-01-01

    The loss of one hand can significantly affect the level of autonomy and the capability of performing daily living, working and social activities. The current prosthetic solutions contribute in a poor way to overcome these problems due to the limitations of the interfaces adopted for controlling the prosthesis and to the absence of force or tactile feedback which limit the hand grasp capabilities. In order to provide indications for further developments in the prosthetic field to increase user...

  19. An organized start to implant-supported prosthesis

    OpenAIRE

    Suma Karthigeyan; Seyed Ashraff Ali; Kalarani Mohan; Mangala Deivanai

    2013-01-01

    Various treatment options are available for rehabilitating the complete edentulous patients with implants. However, due consideration for the prosthesis is not given prior to implant surgery. This can result in implant being placed in locations that do not provide the best esthetic and functional result. Incorrect implant localization and angle are the primary cause of non-axial loading and may contribute to loss of Osseo-integration. For predictable outcome, the treatment should begin with v...

  20. Infection of a Hip Prosthesis by Actinomyces naeslundii

    OpenAIRE

    Wüst, Jürg; Steiger, Ulrich; Vuong, Hanh; Zbinden, Reinhard

    2000-01-01

    We present the case of a 77-year-old woman who developed an Actinomyces naeslundii infection of a hip prosthesis. The isolate grew well aerobically with 5% CO2. Possible diagnostic problems may arise in the microbiological laboratory because aerobic growth is not sufficiently accounted for in some of the traditional identification schemes and commercial test kits. Therefore, besides presenting an unusual pathogen in this setting, this report focuses on possible diagnostic problems in the micr...

  1. Isolated pump erosion of an inflatable penile prosthesis through the scrotum in a diabetic patient

    Directory of Open Access Journals (Sweden)

    Raidh A. Talib

    2013-04-01

    Full Text Available Isolated pump erosion is a rare complication in patients with inflatable penile prosthesis. We describe a case of a diabetic patient who underwent inflatable penile prosthesis implantation with subsequent isolated pump erosion. Repeated attempts of conservative repair of the erosion failed. Finally, the inflatable penile prosthesis was replaced with a malleable one to avoid new pump erosion. In case of isolated pump erosion, replacement of the inflatable penile prosthesis with a malleable one looks to be a good alternative salvage treatment for the patient.

  2. Impact of removable partial denture prosthesis on chewing efficiency

    Directory of Open Access Journals (Sweden)

    Marion Bessadet

    2013-09-01

    Full Text Available Removable partial denture prostheses are still being used for anatomic, medical and economic reasons. However, the impact on chewing parameters is poorly described. OBJECTIVES: The objective of this study was to estimate the impact of removable partial denture prosthesis on masticatory parameters. MATERIAL AND METHODS: Nineteen removable partial denture prosthesis (RPDP wearers participated in the study. Among them, 10 subjects were Kennedy Class III partially edentulous and 9 with posterior edentulism (Class I. All presented a complete and full dentate opposing arch. The subjects chewed samples of carrots and peanuts with and without their prosthesis. The granulometry of the expectorated boluses from carrot and peanuts was characterized by median particle size (D50, determined at the natural point of swallowing. Number of chewing cycles (CC, chewing time (CT and chewing frequency (CF=CC/CT were video recorded. RESULTS: With RPDP, the mean D50 values for carrot and peanuts were lower [Repeated Model Procedures (RMP, F=15, p<0.001] regardless of the type of Kennedy Class. For each food, mean CC, CT and CF values recorded decreased (RMP, F=18, F=9, and F=20 respectively, p<0.01. With or without RPD, the boluses' granulometry values were above the masticatory normative index (MNI determined as 4,000 µm. CONCLUSION: RPDP rehabilitation improves the ability to reduce the bolus particle size, but does not reestablish fully the masticatory function. CLINICAL RELEVANCE: This study encourages the clinical improvement of oral rehabilitation procedure.

  3. Reliability of MRI findings in candidates for lumbar disc prosthesis

    International Nuclear Information System (INIS)

    Limited reliability data exist for localised magnetic resonance imaging (MRI) findings relevant to planning of treatment with lumbar disc prosthesis and later outcomes. We assessed the reliability of such findings in chronic low back pain patients who were accepted candidates for disc prosthesis. On pretreatment MRI of 170 patients (mean age 41 years; 88 women), three experienced radiologists independently rated Modic changes, disc findings and facet arthropathy at L3/L4, L4/L5 and L5/S1. Two radiologists rerated 126 examinations. For each MRI finding at each disc level, agreement was analysed using the kappa statistic and differences in prevalence across observers using a fixed effects model. All findings at L3/L4 and facet arthropathy at L5/S1 had a mean prevalence <10% across observers and were not further analysed, ensuring interpretable kappa values. Overall interobserver agreement was generally moderate or good (kappa 0.40-0.77) at L4-S1 for Modic changes, nucleus pulposus signal, disc height (subjective and measured), posterior high-intensity zone (HIZ) and disc contour, and fair (kappa 0.24) at L4/L5 for facet arthropathy. Posterior HIZ at L5/S1 and severely reduced subjective disc height at L4/L5 differed up to threefold in prevalence between observers (p < 0.0001). Intraobserver agreement was mostly good or very good (kappa 0.60-1.00). In candidates for disc prosthesis, mostly moderate interobserver agreement is expected for localised MRI findings. (orig.)

  4. A kinematic assessment of knee prosthesis from fluoroscopy images

    International Nuclear Information System (INIS)

    We have developed a technique for estimation 3D motion of knee prosthesis from its 2D perspective projections. Our estimation algorithm includes some innovations such as a two-step estimation algorithm, incorporative use of a geometric articulation model and a new method to solve two silhouettes' overlapping problem. Computer model simulations and experiments results demonstrated that our algorithms give sufficient accuracy. Next, with the cooperation of medical surgeons, we assessed the algorithm's clinical performance by applying it to moving fluoroscopy images of patients who had just undergone total knee arthroplasty (TKA) recently. Our experiments were done in four steps; first we have taken the moving X-ray pictures called fluoroscopy images of the knee prosthesis at different knee motions; second, introduced the absolute positions/orientations for both components, third, introduced the relative positions/orientations between the femoral and the tibial components and finally, introduced the contact points trajectories between the femur and the tibial insert. We drew the estimation results graphically and made the computer-aided detection (CAD) model pictures of the prosthesis, thereby helping us to assess how the relative motions between the femoral and the tibial components were generated. Estimation results of the clinical applications demonstrated that our algorithm worked well as like as theoretical. (author)

  5. Literature Review on Needs of Upper Limb Prosthesis Users

    Science.gov (United States)

    Cordella, Francesca; Ciancio, Anna Lisa; Sacchetti, Rinaldo; Davalli, Angelo; Cutti, Andrea Giovanni; Guglielmelli, Eugenio; Zollo, Loredana

    2016-01-01

    The loss of one hand can significantly affect the level of autonomy and the capability of performing daily living, working and social activities. The current prosthetic solutions contribute in a poor way to overcome these problems due to limitations in the interfaces adopted for controlling the prosthesis and to the lack of force or tactile feedback, thus limiting hand grasp capabilities. This paper presents a literature review on needs analysis of upper limb prosthesis users, and points out the main critical aspects of the current prosthetic solutions, in terms of users satisfaction and activities of daily living they would like to perform with the prosthetic device. The ultimate goal is to provide design inputs in the prosthetic field and, contemporary, increase user satisfaction rates and reduce device abandonment. A list of requirements for upper limb prostheses is proposed, grounded on the performed analysis on user needs. It wants to (i) provide guidelines for improving the level of acceptability and usefulness of the prosthesis, by accounting for hand functional and technical aspects; (ii) propose a control architecture of PNS-based prosthetic systems able to satisfy the analyzed user wishes; (iii) provide hints for improving the quality of the methods (e.g., questionnaires) adopted for understanding the user satisfaction with their prostheses. PMID:27242413

  6. Reliability of MRI findings in candidates for lumbar disc prosthesis

    Energy Technology Data Exchange (ETDEWEB)

    Berg, Linda; Espeland, Ansgar [Haukeland University Hospital, Department of Radiology, Bergen (Norway); University of Bergen, Section for Radiology, Department of Surgical Sciences, Bergen (Norway); Neckelmann, Gesche [Haukeland University Hospital, Department of Radiology, Bergen (Norway); Gjertsen, Oeivind [Oslo University Hospital, Department of Neuroradiology, Oslo (Norway); Hellum, Christian [Oslo University Hospital, Department of Orthopaedics, Oslo (Norway); University of Oslo, Department of Orthopaedics, Oslo (Norway); Johnsen, Lars G. [University Hospital of Trondheim, National Centre for Diseases of the Spine, Trondheim (Norway); University Hospital of Trondheim, Orthopaedic Department, Trondheim (Norway); Eide, Geir E. [Haukeland University Hospital, Centre for Clinical Research, Bergen (Norway); University of Bergen, Department of Public Health and Primary Health Care, Bergen (Norway)

    2012-07-15

    Limited reliability data exist for localised magnetic resonance imaging (MRI) findings relevant to planning of treatment with lumbar disc prosthesis and later outcomes. We assessed the reliability of such findings in chronic low back pain patients who were accepted candidates for disc prosthesis. On pretreatment MRI of 170 patients (mean age 41 years; 88 women), three experienced radiologists independently rated Modic changes, disc findings and facet arthropathy at L3/L4, L4/L5 and L5/S1. Two radiologists rerated 126 examinations. For each MRI finding at each disc level, agreement was analysed using the kappa statistic and differences in prevalence across observers using a fixed effects model. All findings at L3/L4 and facet arthropathy at L5/S1 had a mean prevalence <10% across observers and were not further analysed, ensuring interpretable kappa values. Overall interobserver agreement was generally moderate or good (kappa 0.40-0.77) at L4-S1 for Modic changes, nucleus pulposus signal, disc height (subjective and measured), posterior high-intensity zone (HIZ) and disc contour, and fair (kappa 0.24) at L4/L5 for facet arthropathy. Posterior HIZ at L5/S1 and severely reduced subjective disc height at L4/L5 differed up to threefold in prevalence between observers (p < 0.0001). Intraobserver agreement was mostly good or very good (kappa 0.60-1.00). In candidates for disc prosthesis, mostly moderate interobserver agreement is expected for localised MRI findings. (orig.)

  7. Modified cementless total coxofemoral prosthesis: development, implantation and clinical evaluation

    Directory of Open Access Journals (Sweden)

    S.A. Arias

    2013-12-01

    Full Text Available The aim of this study was to modify canine coxofemoral prostheses and the clinical evaluation of the implantation. Fifteen canine hips and femora of cadavers were used in order to study the surface points of modification in prostheses and develop a perforation guide. Femoral stems and acetabular components were perforated and coated with biphasic calcium phosphate layer. Twelve young adult male mongrel dogs were implanted with coxofemoral prostheses. Six were operated upon and implanted with cemented canine modular hip prostheses, establishing the control group. The remaining six were implanted with a novel design of cementless porous tricalcic phosphate-hydroxyapatite coated hip prostheses. Clinical and orthopedic performance, complications, and thigh muscular hypotrophy were assessed up to the 120th post-operatory day. After 120 days, animals with cementless prostheses had similar clinical and orthopedic performance compared to the cemented group despite the increased pain thigh hypotrophy. Animals that underwent cementless hip prosthesis evidenced more pain, compared to animals with cemented hip prosthesis that required longer recuperation time. No luxations, two fractures and two isquiatic neurapraxies were identified in the course of the study. Using both the cemented and the bioactive coated cementless model were suitable to dogs, showing clinical satisfactory results. Osseointegration and biological fixation were observed in the animals with the modified cementless hip prosthesis.

  8. Reconstruction of chronic acromioclavicular joint disruption with artificial ligament prosthesis

    Institute of Scientific and Technical Information of China (English)

    Devendra Kumar Chouhan; Uttam Chand Saini; Mandeep Singh Dhillon

    2013-01-01

    Objective:Management of Rockwood type 3 acromioclavicular disruptions is a matter of debate.Should we adopt conservative or operative measures at first presentation? It is not clear but most of the evidences are in favour of conservative management.We present our experience in managing these patients surgically.Methods:We present a prospective series of eight cases of chronic Rockwood type 3 acromioclavicular joint disruptions treated surgically.Anatomical reconstruction of the coracoclavicular ligament was done by artificial braided polyester ligament prosthesis.Results:All the patients were able to perform daily activities from an average of the 14th postoperative day.All patients felt an improvement in pain,with decrease in average visual analogue scale from preoperative 6.5 points (range 3-9 points) to 2.0 points (range 0-5 points),Constant score from 59% to 91% and American Shoulder and Elbow Surgeons shoulder score from 65 to 93 points postoperatively.These results improved or at least remained stationary on midterm follow-up,and no deterioration was recorded at an average follow-up of 46 months.Conclusion:This midterm outcome analysis of the artificial ligament prosthesis is the first such follow-up study with prosthesis.Our results are encouraging and justify the further use and evaluation of this relatively new and easily reproducible technique.

  9. Literature Review on Needs of Upper Limb Prosthesis Users.

    Science.gov (United States)

    Cordella, Francesca; Ciancio, Anna Lisa; Sacchetti, Rinaldo; Davalli, Angelo; Cutti, Andrea Giovanni; Guglielmelli, Eugenio; Zollo, Loredana

    2016-01-01

    The loss of one hand can significantly affect the level of autonomy and the capability of performing daily living, working and social activities. The current prosthetic solutions contribute in a poor way to overcome these problems due to limitations in the interfaces adopted for controlling the prosthesis and to the lack of force or tactile feedback, thus limiting hand grasp capabilities. This paper presents a literature review on needs analysis of upper limb prosthesis users, and points out the main critical aspects of the current prosthetic solutions, in terms of users satisfaction and activities of daily living they would like to perform with the prosthetic device. The ultimate goal is to provide design inputs in the prosthetic field and, contemporary, increase user satisfaction rates and reduce device abandonment. A list of requirements for upper limb prostheses is proposed, grounded on the performed analysis on user needs. It wants to (i) provide guidelines for improving the level of acceptability and usefulness of the prosthesis, by accounting for hand functional and technical aspects; (ii) propose a control architecture of PNS-based prosthetic systems able to satisfy the analyzed user wishes; (iii) provide hints for improving the quality of the methods (e.g., questionnaires) adopted for understanding the user satisfaction with their prostheses. PMID:27242413

  10. Avaliação do quadril de amputados transfemoral durante contração isométrica em dinamômetro isocinético

    OpenAIRE

    Vera Regina Fernandes da Silva Marães; Bruna Oliveira de Almeida Marques da Cruz; Juliana Aparecida Moreira; Tainara Ferreira de Sampaio; Camila Cadena Almeida; Patrícia Azevedo Garcia

    2014-01-01

    INTRODUÇÃO: A amputação transfemoral leva a uma série de alterações funcionais na biomecânica corporal que podem interferir no cotidiano do amputado, podendo gerar, ainda, padrões de postura e de marcha para compensar a perda do membro. OBJETIVO: Avaliar e comparar as respostas musculares do quadril de amputados transfemorais durante contrações isométricas, utilizando-se um dinamômetro isocinético. MÉTODO: Participaram do estudo quatro voluntários, sendo dois amputados e dois não amp...

  11. Treatment of sharp mandibular alveolar process with hybrid prosthesis

    Directory of Open Access Journals (Sweden)

    Sukaedi Sukaedi

    2010-09-01

    Full Text Available Background: Losing posterior teeth for a long time would occasionally lead to the sharpening of alveolar process. The removable partial denture usually have problems when used during mastication, because of the pressure on the mucosa under the alveolar ridge. Purpose: The purpose of this case report was to manage patients with sharp mandibular alveolar process by wearing hybrid prosthesis with extra coronal precision attachment retention and soft liner on the surface base beneath the removable partial denture. Case: A 76 years old woman visited the Prosthodontic Clinic Faculty of Dentistry Airlangga University. The patient had a long span bridge on the upper jaw and a free end acrylic removable partial denture on the lower jaw. She was having problems with mastication. The patient did not wear her lower denture because of the discomfort with it during mastication. Hence, she would like to replace it with a new removable partial denture. Case management: The patient was treated by wearing a hybrid prosthesis with extra coronal precision attachment on the lower jaw. Soft liner was applied on the surface of the removable partial denture. Hybrid prosthesis is a complex denture consisting of removable partial denture and fixed bridge. Conclusion: It concluded that after restoration, the patient had no problems with sharp alveolar process with her new denture, and she was able to masticate well.Latar belakang: Kehilangan geligi posterior dapat menimbulkan processus alveolaris tajam. Gigi tiruan sebagian lepasan mempunyai masalah selama pengunyahan karena adanya tekanan di mukosa di bawah alveolar ridge. Tujuan: Tujuan laporan kasus ini adalah untuk menjelaskan cara menangani pasien yang mempunyai prosesus alveolaris yang tajam di rahang bawah dengan dibuatkan protesis hybrid dengan daya tahan extra coronal precision attachment dan soft liner di permukaan bawah basis gigi tiruan sebagian lepasan. Kasus: Pasien wanita berumur 76 tahun datang di klinik

  12. Stress analysis of different prosthesis materials in implant-supported fixed dental prosthesis using 3D finite element method

    Directory of Open Access Journals (Sweden)

    Pedram Iranmanesh

    2014-01-01

    Full Text Available Introduction: In the present study, the finite element method (FEM was used to investigate the effects of prosthesis material types on stress distribution of the bone surrounding implants and to evaluate stress distribution in three-unit implant-supported fixed dental prosthesis (FDP. Materials and Methods: A three-dimensional (3D finite element FDP model of the maxillary second premolar to the second molar was designed. Three load conditions were statically applied on the functional cusps in horizontal (57.0 N, vertical (200.0 N, and oblique (400.0 N, θ = 120° directions. Four standard framework materials were evaluated: Polymethyl methacrylate (PMMA, base-metal, porcelain fused to metal, andporcelain. Results: The maximum of von Mises stress in the oblique direction was higher than the vertical and horizontal directions in all conditions. In the bone-crestal section, the maximum von Mises stress (53.78 MPa was observed in PMMA within oblique load. In FDPs, the maximum stress was generated at the connector region in all conditions. Conclusion: A noticeable difference was not observed in the bone stress distribution pattern with different prosthetic materials. Although, higher stress value could be seen in polymethyl methacrylate, all types of prosthesis yielded the same stress distribution pattern in FDP. More clinical studies are needed to evaluate the survival rate of these materials.

  13. Dosimetric intercomparison for two Australasian clinical trials using an anthropomorphic phantom

    International Nuclear Information System (INIS)

    Introduction: Many different factors can affect the accurate delivery of dose to the clinical target volume in radiotherapy. This is particularly important in the context of multicenter clinical trials where different equipment and techniques may be used for supposedly identical treatments. A dosimetric intercomparison employing an anthropomorphic phantom (level III dosimetric intercomparison) can be used to check many of the factors that could affect treatment by mimicking the radiotherapy pathway of a patient as closely as possible. Methods and Materials: An anthropomorphic phantom (ART) was taken to 18 radiotherapy centers in Australia and New Zealand and treated for two different treatment scenarios based on current clinical trials of the Trans-Tasman Radiation Oncology Group (TROG): a two-field treatment of a carcinoma of the tonsil (TROG 91.01), and a four-field prostate treatment (TROG 96.01). The dose distribution was assessed in two consecutive treatments using thermoluminescence dosimeters (TLDs) placed throughout the target volume and in 'critical' structures such as the lens of the eye or the rectum. The study also included a check of absolute dose calibration in a slab phantom (level I dosimetric intercomparison). The influence of a variety of treatment parameters on the dose homogeneity in the target and the measured dose in the target and the critical organs was evaluated. Results: The dose measurements confirmed that in all participating centers the correct dose was delivered to the ICRU reference point (tonsil: 99.8±2.3%; prostate: 100.9±1.9% [1 SD]). Also the absolute dose calibration and the mean dose in the target volume were within the specified action levels of ±5% for all participating centers. No influence of shielding, beam modifiers, beam weighting, treatment planning approach (CT, 2D, 3D), and type of equipment used on the dose in the target and its homogeneity could be demonstrated. However, treatment technique and energy used

  14. Medical staff extremity dosimetry in CT fluoroscopy: an anthropomorphic hand voxel phantom study

    Science.gov (United States)

    Figueira, C.; Becker, F.; Blunck, C.; DiMaria, S.; Baptista, M.; Esteves, B.; Paulo, G.; Santos, J.; Teles, P.; Vaz, P.

    2013-08-01

    This work aims to contribute to the study of the radiation dose distribution delivered to the hands of medical staff members during a general computed tomographic (CT) fluoroscopic guided procedure. In this study, both Monte Carlo simulations and measurements were performed. For free-in-air and computed tomography dose index (CTDI) body phantom measurements, a standard pencil ionization chamber (IC) 100 mm long was used. The CT scanner model was implemented using MCNPX (Monte Carlo N-Particle eXtended) and was successfully validated by comparing the simulated results with measurements. Subsequently, CT images of a hand, together with an anthropomorphic phantom, were voxelized and used with the MCNPX code for dose calculations. The hand dose distribution study was performed both by using thermo-luminescent detector measurements and Monte Carlo simulations. The validated simulation tool provides a new perspective for detailed investigations of CT-irradiation scenarios. Simulations show that there is a strong dose gradient, namely the even zones of the hand that are in precise vicinity to the x-ray beam only receive about 4% of the maximum dose delivered to adjacent areas which are directly exposed to the primary x-ray beam. Finally, the scatter contribution of the patient was also studied through MC simulations. The results show that for directly exposed parts of the hand surface, the dose is reduced by the body of the patient (due to the shielding), whereas the dose is increased by scattered radiation from the patient for parts of the skin that receive scattered radiation only.

  15. An anthropomorphic head and neck phantom for evaluation of intensity modulated radiation therapy

    International Nuclear Information System (INIS)

    Intensity Modulated Radiation Therapy (IMRT) has gained acceptance as an improved treatment technique for several disease sites. As the use of IMRT increases, national cancer study groups are beginning to initiate clinical trials that involve its use. Because IMRT offers the possibility of high dose gradients, it is possible to deliver high doses to target volumes while maintaining low doses to nearby critical normal structures. The use of high gradients means that localization of the dose distribution is critical. Small errors in positioning of the patient can cause a target volume to be missed or a critical structure to receive a higher dose than can be tolerated. Consequently, it is important that the institutions participating in clinical trials administer IMRT consistently and accurately. The Radiological Physics Center (RPC) has been funded by the US National Cancer Institute (NCI) to assure the study groups that participants in clinical trials have adequate QA procedures and that their patient dosimetry is accurate. The RPC also reviews and credentials institutions to participate in some high-technology clinical trials. To credential institutions for IMRT head and neck trials, the RPC has developed a mailable anthropomorphic head and neck phantom. The phantom has been used to evaluate the imaging, planning and delivery of IMRT prior to the institution's participation in the protocol. The water-filled phantom contains a polystyrene insert that incorporates solid-water imageable structures representing a primary planning target volume (PTV), a secondary PTV and a critical structure. The insert holds four TLD as well as a set of orthogonal radiochromic films. TLD results combined with profiles taken from the film were used to demonstrate that doses were delivered accurately to the intended locations

  16. Use of realistic anthropomorphic models for calculation of radiation dose in nuclear medicine

    International Nuclear Information System (INIS)

    Anthropomorphic phantoms based on simple geometric structures have been used in radiation dose calculations for many years. We have now developed a series of anatomically realistic phantoms representing adults and children using body models based on non-uniform rational B-spline (NURBS), with organ and body masses based on the reference values given in ICRP Publication 89. Age-dependent models were scaled and shaped to represent the reference individuals described in ICRP 89 (male and female adults, newborns, 1-, 5-, 10- and 15-year-olds), using a software tool developed in Visual C++. Voxel-based versions of these models were used with GEANT4 radiation transport codes for calculation of specific absorbed fractions (SAFs) for internal sources of photons and electrons, using standard starting energy values. Organ masses in the models were within a few % of ICRP reference masses, and physicians reviewed the models for anatomical realism. Development of individual phantoms was much faster than manual segmentation of medical images, and resulted in a very uniform standardized phantom series. SAFs were calculated on the Vanderbilt multi node computing network (ACCRE). Photon and electron SAFs were calculated for all organs in all models, and were compared to values from similar phantoms developed by others. Agreement was very good in most cases; some differences were seen, due to differences in organ mass and geometry. This realistic phantom series represents a possible replacement for the Cristy/Eckerman series of the 1980's. Both phantom sets will be included in the next release of the OLINDA/EXM personal computer code, and the new phantoms will be made generally available to the research community for other uses. Calculated radiation doses for diagnostic and therapeutic radiopharmaceuticals will be compared with previous values. (author)

  17. Use of realistic anthropomorphic models for calculation of radiation dose in nuclear medicine

    International Nuclear Information System (INIS)

    Anthropomorphic phantoms based on simple geometric structures have been used in radiation dose calculations for many years. We have now developed a series of anatomically realistic phantoms representing adults and children using body models based on non-uniform rational B-spline (NURBS), with organ and body masses based on the reference values given in ICRP Publication 89. Age-dependent models were scaled and shaped to represent the reference individuals described in ICRP 89 (male and female adults, newborns, 1-, 5-, 10- and 15-year-olds), using a software tool developed in Visual C++. Voxel-based versions of these models were used with GEANT4 radiation transport codes for calculation of specific absorbed fractions (SAFs) for internal sources of photons and electrons, using standard starting energy values. Organ masses in the models were within a few % of ICRP reference masses, and physicians reviewed the models for anatomical realism. Development of individual phantoms was much faster than manual segmentation of medical images, and resulted in a very uniform standardized phantom series. SAFs were calculated on the Vanderbilt multinode computing network (ACCRE). Photon and electron SAFs were calculated for all organs in all models, and were compared to values from similar phantoms developed by others. Agreement was very good in most cases; some differences were seen, due to differences in organ mass and geometry. This realistic phantom series represents a possible replacement for the Cristy/Eckerman series of the 1980's. Both phantom sets will be included in the next release of the OLINDA/EXM personal computer code, and the new phantoms will be made generally available to the research community for other uses. Calculated radiation doses for diagnostic and therapeutic radiopharmaceuticals will be compared with previous values. (author)

  18. 21 CFR 888.3320 - Hip joint metal/metal semi-constrained, with a cemented acetabular component, prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented acetabular component, prosthesis. 888.3320 Section 888.3320 Food and Drugs FOOD AND DRUG..., prosthesis. (a) Identification. A hip joint metal/metal semi-constrained, with a cemented acetabular component, prosthesis is a two-part device intended to be implanted to replace a hip joint. The...

  19. 21 CFR 888.3390 - Hip joint femoral (hemi-hip) metal/polymer cemented or uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... cemented or uncemented prosthesis. 888.3390 Section 888.3390 Food and Drugs FOOD AND DRUG ADMINISTRATION... § 888.3390 Hip joint femoral (hemi-hip) metal/polymer cemented or uncemented prosthesis. (a) Identification. A hip joint femoral (hemi-hip) metal/polymer cemented or uncemented prosthesis is a...

  20. 21 CFR 888.3330 - Hip joint metal/metal semi-constrained, with an uncemented acetabular component, prosthesis.

    Science.gov (United States)

    2010-04-01

    ... uncemented acetabular component, prosthesis. 888.3330 Section 888.3330 Food and Drugs FOOD AND DRUG..., prosthesis. (a) Identification. A hip joint metal/metal semi-constrained, with an uncemented acetabular component, prosthesis is a two-part device intended to be implanted to replace a hip joint. The...

  1. 21 CFR 888.3535 - Knee joint femorotibial (uni-compartmental) metal/polymer porous-coated uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    .../polymer porous-coated uncemented prosthesis. 888.3535 Section 888.3535 Food and Drugs FOOD AND DRUG... prosthesis. (a) Identification. A knee joint femorotibial (uni-compartmental) metal/polymer porous-coated uncemented prosthesis is a device intended to be implanted to replace part of a knee joint. The device...

  2. 21 CFR 888.3358 - Hip joint metal/polymer/metal semi-constrained porous-coated uncemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... porous-coated uncemented prosthesis. 888.3358 Section 888.3358 Food and Drugs FOOD AND DRUG... Devices § 888.3358 Hip joint metal/polymer/metal semi-constrained porous-coated uncemented prosthesis. (a) Identification. A hip joint metal/polymer/metal semi-constrained porous-coated uncemented prosthesis is a...

  3. 21 CFR 888.3410 - Hip joint metal/polymer or ceramic/polymer semiconstrained resurfacing cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... semiconstrained resurfacing cemented prosthesis. 888.3410 Section 888.3410 Food and Drugs FOOD AND DRUG... prosthesis. (a) Identification. A hip joint metal/polymer or ceramic/polymer semi-constrained resurfacing cemented prosthesis is a two-part device intended to be implanted to replace the articulating surfaces...

  4. 21 CFR 888.3380 - Hip joint femoral (hemi-hip) trunnion-bearing metal/polyacetal cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    ... metal/polyacetal cemented prosthesis. 888.3380 Section 888.3380 Food and Drugs FOOD AND DRUG... Devices § 888.3380 Hip joint femoral (hemi-hip) trunnion-bearing metal/polyacetal cemented prosthesis. (a) Identification. A hip joint femoral (hemi-hip) trunnion-bearing metal/polyacetal cemented prosthesis is a...

  5. 21 CFR 888.3560 - Knee joint patellofemorotibial polymer/metal/polymer semi-constrained cemented prosthesis.

    Science.gov (United States)

    2010-04-01

    .../polymer semi-constrained cemented prosthesis. 888.3560 Section 888.3560 Food and Drugs FOOD AND DRUG... prosthesis. (a) Identification. A knee joint patellofemorotibial polymer/metal/polymer semi-constrained cemented prosthesis is a device intended to be implanted to replace a knee joint. The device...

  6. Ossiculoplasty with autologous incus versus titanium prosthesis: A comparison of anatomical and functional results

    Directory of Open Access Journals (Sweden)

    Amith I Naragund

    2011-01-01

    Full Text Available Aims: To analyze and compare the outcomes of ossiculoplasty in terms of hearing results and graft take-up rates, using autograft incus and titanium middle ear prosthesis in patients with ossicular chain erosion. Study Design: Randomized clinical trial. Materials and Methods: Patients between 10 and 60 years of age with a history of chronic ear discharge with moderate conductive deafness (>40 dB HL were included in the study. The patients underwent detailed ENT examination followed by audiological and radiological assessment of temporal bone and those patients with evidence of ossicular erosion were subjected to ossiculoplasty with autologous incus (group I or titanium prosthesis (group II randomly. The patients were followed up after 3 months to analyze the functional and anatomical results. Results: A total of 24 patients with ossicular chain defect were included in the study, of whom 12 patients underwent ossiculoplasty with autograft incus and 12 with titanium prosthesis. Postoperative hearing evaluation by pure tone audiogram was done after 3 months, which showed successful hearing improvement in 58% of cases with autologous incus as compared to 33% cases with titanium prosthesis. Complications and extrusion rate were also higher in patients with titanium prosthesis. Conclusion: Hearing results after ossiculoplasty with autologous incus were significantly better compared with those after titanium prosthesis. Also, complications and extrusion rate were higher in patients with titanium prosthesis. This indicates that ossiculoplasty with autoincus offers better hearing results with minimal complications and extrusion rates as compared to titanium prosthesis.

  7. Stress Distribution in Implant Retained Finger Prosthesis: A Finite Element Study

    OpenAIRE

    Amornvit, Pokpong; Rokaya, Dinesh; Keawcharoen, Konrawee; Thongpulsawasdi, Nimit

    2013-01-01

    Background: Finger amputation may result from congenital cause, trauma, infection and tumours. The finger amputation may be rehabilitated with dental implant-retained finger prosthesis. The success of implant-retained finger prosthesis is determined by the implant loading. The type of the force is a determining factor in implant loading.

  8. 21 CFR 888.3810 - Wrist joint ulnar (hemi-wrist) polymer prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Wrist joint ulnar (hemi-wrist) polymer prosthesis. 888.3810 Section 888.3810 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN... (hemi-wrist) polymer prosthesis. (a) Identification. A wrist joint ulnar (hemi-wrist) polymer...

  9. 21 CFR 888.3730 - Toe joint phalangeal (hemi-toe) polymer prosthesis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Toe joint phalangeal (hemi-toe) polymer prosthesis. 888.3730 Section 888.3730 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN... (hemi-toe) polymer prosthesis. (a) Identification. A toe joint phalangeal (hemi-toe) polymer...

  10. 78 FR 79308 - Dental Devices; Reclassification of Temporary Mandibular Condyle Prosthesis

    Science.gov (United States)

    2013-12-30

    ... reclassify this device in the Federal Register of February 7, 2013 (78 FR 9010) (the 2013 proposed order... Temporary Mandibular Condyle Prosthesis AGENCY: Food and Drug Administration, HHS. ACTION: Final order... mandibular condyle prosthesis, a preamendments class III device, into class II (special controls), and...

  11. Development of a cosmetic knee disarticulation prosthesis : A single-patient case study

    NARCIS (Netherlands)

    de Laat, Fred A.; de Vos, Wouter; Geertzen, Jan; Roorda, Leo D.

    2015-01-01

    Background and aim: If a person does not become ambulant after an amputation, a knee disarticulation (KD) shouldbe considered and the person may then benefit from a cosmetic KD prosthesis. The features of a cosmetic KD prosthesis are, however, seldom described. The aim of this clinical note is to de

  12. Stress Transfer Modeling at the Interface of Cemented Prosthesis and Femur

    Institute of Scientific and Technical Information of China (English)

    YU Xue-zhong; GUO Yi-mu; ZHANG Yun-qiu; LI Jun; HE Rong-xing

    2008-01-01

    .Objective:To model the stress transfer at the interface of the cemented prosthesis and femur, an axisymmetric model of the interfacial stress transfer was established.Methods: Assuming that the prosthesis, the cement and the femur were concentric cylinders with linear elastic and isotropic properties, distributions of the axial stresses in the prosthesis, the cement and the femur as well as the interfacial shear stresses at the prosthesis/cement interface and the cement/femur interface in the axial direction were obtained from the established axisymmetric stress transfer model.Results: Interfacial failure was the main form for the prosthesis/cement/femur structure under external loads. Considering the residual thermal stresses, it was more likely to produce the mixed failure form than the pure shear failure form. Since the cement had a relatively high thermal expansion coefficient, the thermal effect accelerated the interface failure and thus aggravated the stress shielding effect. Due to a relatively high thermal residual temperature difference, the interfacial debonding and femur failure was more likely to occur for the cobalt-chromium alloy prosthesis material than the Ti-6Al-4V alloy prosthesis material.Conclusion: Assuming that the prosthesis, the cement and the femur are concentric cylinders with linear elastic and isotropic properties, distributions of the axial stresses in the prosthesis, the cement and the femur as well as the interfacial shear stresses at the prosthesis/cement interface and the cement/femur interface in the axial direction was obtained using the basic equations of axisymmetric elastic mechanics when the prosthesis bears the compressive stresses. Interface failure is the main failure form for the prosthesis/cement/femur structure under external loads. The thermal effects accelerate the failure of the prosthesis/cement interface and the cement/femur interface and the relaxation of the prosthesis, and then aggravates the stress shielding

  13. Effect of silicone gel breast prosthesis on electron and photon dose distributions

    International Nuclear Information System (INIS)

    The effect of a silicone gel breast prosthesis on the absorbed dose distribution of 9-20 MeV electron beams and 1.25-15 MV photon beams was studied. Compared to water measurements, at depths smaller than the practical range of the electron beams, the central axis depth dose values below the prosthesis were lower for all energies by as much as 3.5%. However, at depths near the practical range, the central axis depth dose values for the prosthesis were greater than that of water by as much as 33%. Since this occurs near the end of the electron range, the resultant difference may not be clinically significant. Results of the effect of breast prosthesis on photon depth dose distributions reveal that no clinically significant perturbation is produced by the breast prosthesis using Co-60, 6- and 15-MV radiations

  14. Prosthesis infections after orthopedic joint replacement: the possible role of bacterial biofilms

    Directory of Open Access Journals (Sweden)

    Zhijun Song

    2013-06-01

    Full Text Available Prosthesis-related infection is a serious complication for patients after orthopedic joint replacement, which is currently difficult to treat with antibiotic therapy. Consequently, in most cases, removal of the infected prosthesis is the only solution to cure the infection. It is, therefore, important to understand the comprehensive interaction between the microbiological situation and the host immune responses that lead to prosthesis infections. Evidence indicates that prosthesis infections are actually biofilm-correlated infections that are highly resistant to antibiotic treatment and the host immune responses. The authors reviewed the related literature in the context of their clinical experience, and discussed the possible etiology and mechanism leading to the infections, especially problems related to bacterial biofilm, and prophylaxis and treatment of infection, including both microbiological and surgical measures. Recent progress in research into bacterial biofilm and possible future treatment options of prosthesis-related infections are discussed.

  15. Stomatitis sub-prosthesis in patients with superior dental prosthesis Estomatitis subprótesis en pacientes portadores de prótesis dental superior

    OpenAIRE

    Ana Gloria Vázquez de León; Yoel González Beriau; Antonia Martina Francisco Local

    2009-01-01

    Background: The stomatitis sub-prosthesis is one of the most frequent changes in hard palate mucous membrane in patients with mucous-supported dental prosthesis. It can be caused by multiple factors, which makes its study and prognosis more difficult.

  16. 99m technetium-MDP bone scintigraphy in evaluation of painful joint prosthesis

    International Nuclear Information System (INIS)

    In addition of clinical evaluation and x-ray radiography, the diagnosis of a loose joint prosthesis is often made by nuclear medicine imaging techniques. Differentiation between loosening and infected prosthesis is important for better treatment of those patients. Aim: The aim of this study was to reevaluate the scintigraphic patterns in patients with painful hip of knee arthroplasty. Material and Method: From 1996. to 2003. forty patients aged 49-78 years were referred for evaluation of possible loosening/infection joint prosthesis: 36 pts with 39 total/ partial hip prosthesis, 1 pt with knee prosthesis and 3 pts with history of previously extracted hip prosthesis due to infection. Whole body acquisition had been performed with a single head gamma camera three hours after the injection of 740 MBq 99mTc-MDP. Scans were classified as: positive for loosening if abnormal uptake was shown at the tip of the prosthesis; positive for infection if diffuse abnormal uptake was shown around the implant; negative and indeterminate scans. Scintigraphic findings were compared to clinical follow up, histology or cultures. Results: Positive findings were found in 17 bone scans strongly suggesting loosening in 10 cases, infection of prosthesis in 4 cases and both loosening/infection in 3 cases. Bone scintigraphy was normal in 11pts. Scans of three pts with previously extracted hip prosthesis and scheduled for reimplatation, showed inhomogeneously and mildly increased uptake in femur. Most of scans classified as indeterminate (n=12) showed slightly increased tracer uptake in region of acetabular roof, greater or lesser tho chanter, suggesting bone remodeling due to the presence of implant, rather than loosening. Conclusion: 99mTc-MDP bone scintigraphy had a significant role in assessing the painful joint prosthesis. Complementary diagnostic procedures should be considered in indeterminate scintiscans. (authors)

  17. Axial penile rigidity influences patient and partner satisfaction after penile prosthesis implantation

    Directory of Open Access Journals (Sweden)

    Abdulla Al Ansari

    2013-09-01

    Full Text Available Introduction: Penile prosthesis implantation is one of the treatment choices that is kept for patients who were not satisfied with other treatments. Although penile prosthesis satisfaction rates are higher, there are some dissatisfied patients. The patients’ reasons are mostly shortness and softness of implanted prosthesis. It was previously demonstrated that penile axial rigidity of more than 500 grams is enough for successful vaginal intromission. To our knowledge, there is no study comparing axial rigidity of penile prosthesis and satisfaction. Objectives: The aim of this study was to examine whether axial rigidity of penile prosthesis had impact on patient and partner satisfaction. Materials and Methods: We enrolled one hundred patients who were implanted penile prosthesis before to evaluate their penile axial rigidity. We used Rigidometry (by using the digital inflection rigidometer to assess the minimal axial pressure to bend the implanted penis. Results: We demonstrated that mean axial pressure to bend the implanted penis was 984.8 ± 268.7 grams. Overall satisfaction score with the penile prosthesis implant was 4.55 and 4.49 (out of 5 in patients and partners, respectively. In total, seven men were unsatisfied with their implant and reported a mean satisfaction score of 0.6 ± 0.48 (out of 5. All prostheses types showed good and more than 500 grams axial rigidity. The patients with Ambicor type, which were buckled at about 710.5 grams, showed worse satisfaction rates in comparison to other prostheses in two patients. Digital inflection rigidometer results of other penile prosthesis types in unsatisfied patient were 842.0, 872.0, 887.0 and 920 g. in CX700, Titan, Genesis and Titan OTR, respectively. Conclusion: We demonstrated that dissatisfaction rate was highest in Ambicor prosthesis implanted patients. Additionally, patients with 3-piece penile prosthesis were more satisfied than 2-piece or malleable ones, interestingly, although

  18. Experimental validation of a kV source model and dose computation method for CBCT imaging in an anthropomorphic phantom.

    Science.gov (United States)

    Poirier, Yannick; Tambasco, Mauro

    2016-01-01

    We present an experimental validation of a kilovoltage (kV) X-ray source characterization model in an anthropomorphic phantom to estimate patient-specific absorbed dose from kV cone-beam computed tomography (CBCT) imaging procedures and compare these doses to nominal weighted CT-dose index (CTDIw) dose estimates. We simulated the default Varian on-board imager 1.4 (OBI) default CBCT imaging protocols (i.e., standard-dose head, low-dose thorax, pelvis, and pelvis spotlight) using our previously developed and easy to implement X-ray point-source model and source characterization approach. We used this characterized source model to compute absorbed dose in homogeneous and anthropomorphic phantoms using our previously validated in-house kV dose computation software (kVDoseCalc). We compared these computed absorbed doses to doses derived from ionization chamber measurements acquired at several points in a homogeneous cylindrical phantom and from thermoluminescent detectors (TLDs) placed in the anthropomorphic phantom. In the homogeneous cylindrical phantom, computed values of absorbed dose relative to the center of the phantom agreed with measured values within ≤2% of local dose, except in regions of high-dose gradient where the distance to agreement (DTA) was 2 mm. The computed absorbed dose in the anthropomorphic phantom generally agreed with TLD measurements, with an average percent dose difference ranging from 2.4% ± 6.0% to 5.7% ± 10.3%, depending on the characterized CBCT imaging protocol. The low-dose thorax and the standard dose scans showed the best and worst agreement, respectively. Our results also broadly agree with published values, which are approximately twice as high as the nominal CTDIw would suggest. The results demonstrate that our previously developed method for modeling and characterizing a kV X-ray source could be used to accurately assess patient-specific absorbed dose from kV CBCT procedures within reasonable accuracy, and serve as further

  19. Definitive magnetic nasal prosthesis for partial nasal defect

    Directory of Open Access Journals (Sweden)

    E Nagaraj

    2011-01-01

    Full Text Available Maxillofacial trauma refers to any injury to the face or jaw caused by physical force, trauma, the presence of foreign objects, animal or human bites, and burns. Facial defects can be devastating in their impact on physical structure and function of the affected individual, leading to potential compromises in quality of life. Restoration of facial defects, especially nasal defects, is a difficult challenge for both the surgeon and the prosthodontist. Here is a case report of partial nasal defect caused by trauma, rehabilitated with a magnetic nasal prosthesis made with silicone elastomers using mechanical and anatomical retentive aids.

  20. In vivo isocenter dose in two hip prosthesis patients

    International Nuclear Information System (INIS)

    Hip prostheses may cause irradiation dose inhomogeneities in conventional four-field target volumes to the pelvis. Two patients, with bilateral and unilateral prostheses, were subjected to thermoluminescent dosimetry measurements in the prostatic urethra during 24 MV photon portal exposures. The results suggested a 13% decrease in absorbed dose only for conventional four-field beam geometry with bilateral prostheses, as compared to oblique four-field beam geometry or unilateral prosthesis. This supports the suggestion that beam technique modifications may be warranted for patients with hip prostheses

  1. Amputation and prosthesis implantation shape body and peripersonal space representations

    OpenAIRE

    Elisa Canzoneri; Marilena Marzolla; Amedeo Amoresano; Gennaro Verni; Andrea Serino

    2013-01-01

    Little is known about whether and how multimodal representations of the body (BRs) and of the space around the body (Peripersonal Space, PPS) adapt to amputation and prosthesis implantation. In order to investigate this issue, we tested BR in a group of upper limb amputees by means of a tactile distance perception task and PPS by means of an audio-tactile interaction task. Subjects performed the tasks with stimulation either on the healthy limb or the stump of the amputated limb, while wearin...

  2. Rupture of an expander prosthesis mimics axillary cancer recurrence.

    LENUS (Irish Health Repository)

    Ismael, T

    2005-10-01

    Regional silicone gel migration from a ruptured breast implant has been reported at different locations including the upper extremity, chest wall muscles, axilla and back. We report a patient who presented with an axillary mass that mimicked a regional recurrence 5 years after breast cancer reconstruction with a latissimus dorsi musculocutaneous flap and silicon gel expander-prosthesis. Surgical exploration revealed that the mass contained silicone gel around the port of the breast expander that had ruptured. The mass was confluent with an intracapsular silicone leak through a tract along the tube of the expander port.

  3. Acute LVOT Obstruction with a Carbomedics Mechanical Valve Prosthesis.

    Science.gov (United States)

    Alsidawi, Said; Joyce, David L; Malouf, Joseph F; Nkomo, Vuyisile T

    2016-06-01

    A 62-year-old female with severe symptomatic rheumatic mitral stenosis was referred for mitral valve replacement. A 27-mm Carbomedics mechanical mitral valve was placed using everting sutures. As the patient was weaned off cardiopulmonary bypass, she became hemodynamically unstable. Intraoperative transesophageal echocardiogram revealed a significant drop in left ventricular function along with severe LVOT obstruction. The Carbomedics prosthesis was replaced by a 27-mm St. Jude mechanical valve using noneverting sutures which relieved the LVOT obstruction. doi: 10.1111/jocs.12749 (J Card Surg 2016;31:376-379). PMID:27087635

  4. Design and integration of an instrumented knee prosthesis

    OpenAIRE

    Simoncini, Matteo

    2014-01-01

    Total knee arthroplasty is nowadays one of the most important orthopedic surgery. It consists of a procedure in which parts of the knee are replaced by a prosthesis. The largest indication for total knee arthroplasty is osteoarthritis, a knee disease that can cause the cartilage of the femur and tibia to wear away, so that the bones rub together with use. The major risk factors for osteoarthritis are aging and obesity. Both the life expectancy and the obesity rate are increasing in the develo...

  5. Evaluation of Human and Anthropomorphic Test Device Finite Element Models under Spaceflight Loading Conditions

    Science.gov (United States)

    Putnam, Jacob P.; Untaroiu, Costin; Somers. Jeffrey

    2014-01-01

    In an effort to develop occupant protection standards for future multipurpose crew vehicles, the National Aeronautics and Space Administration (NASA) has looked to evaluate the test device for human occupant restraint with the modification kit (THOR-K) anthropomorphic test device (ATD) in relevant impact test scenarios. With the allowance and support of the National Highway Traffic Safety Administration, NASA has performed a series of sled impact tests on the latest developed THOR-K ATD. These tests were performed to match test conditions from human volunteer data previously collected by the U.S. Air Force. The objective of this study was to evaluate the THOR-K finite element (FE) model and the Total HUman Model for Safety (THUMS) FE model with respect to the tests performed. These models were evaluated in spinal and frontal impacts against kinematic and kinetic data recorded in ATD and human testing. Methods: The FE simulations were developed based on recorded pretest ATD/human position and sled acceleration pulses measured during testing. Predicted responses by both human and ATD models were compared to test data recorded under the same impact conditions. The kinematic responses of the models were quantitatively evaluated using the ISO-metric curve rating system. In addition, ATD injury criteria and human stress/strain data were calculated to evaluate the risk of injury predicted by the ATD and human model, respectively. Results: Preliminary results show well-correlated response between both FE models and their physical counterparts. In addition, predicted ATD injury criteria and human model stress/strain values are shown to positively relate. Kinematic comparison between human and ATD models indicates promising biofidelic response, although a slightly stiffer response is observed within the ATD. Conclusion: As a compliment to ATD testing, numerical simulation provides efficient means to assess vehicle safety throughout the design process and further improve the

  6. SU-E-I-94: Automated Image Quality Assessment of Radiographic Systems Using An Anthropomorphic Phantom

    International Nuclear Information System (INIS)

    Purpose: In a large, academic medical center, consistent radiographic imaging performance is difficult to routinely monitor and maintain, especially for a fleet consisting of multiple vendors, models, software versions, and numerous imaging protocols. Thus, an automated image quality control methodology has been implemented using routine image quality assessment with a physical, stylized anthropomorphic chest phantom. Methods: The “Duke” Phantom (Digital Phantom 07-646, Supertech, Elkhart, IN) was imaged twice on each of 13 radiographic units from a variety of vendors at 13 primary care clinics. The first acquisition used the clinical PA chest protocol to acquire the post-processed “FOR PRESENTATION” image. The second image was acquired without an antiscatter grid followed by collection of the “FOR PROCESSING” image. Manual CNR measurements were made from the largest and thickest contrast-detail inserts in the lung, heart, and abdominal regions of the phantom in each image. An automated image registration algorithm was used to estimate the CNR of the same insert using similar ROIs. Automated measurements were then compared to the manual measurements. Results: Automatic and manual CNR measurements obtained from “FOR PRESENTATION” images had average percent differences of 0.42%±5.18%, −3.44%±4.85%, and 1.04%±3.15% in the lung, heart, and abdominal regions, respectively; measurements obtained from “FOR PROCESSING” images had average percent differences of -0.63%±6.66%, −0.97%±3.92%, and −0.53%±4.18%, respectively. The maximum absolute difference in CNR was 15.78%, 10.89%, and 8.73% in the respective regions. In addition to CNR assessment of the largest and thickest contrast-detail inserts, the automated method also provided CNR estimates for all 75 contrast-detail inserts in each phantom image. Conclusion: Automated analysis of a radiographic phantom has been shown to be a fast, robust, and objective means for assessing radiographic

  7. SU-E-I-94: Automated Image Quality Assessment of Radiographic Systems Using An Anthropomorphic Phantom

    Energy Technology Data Exchange (ETDEWEB)

    Wells, J; Wilson, J; Zhang, Y; Samei, E; Ravin, Carl E. [Advanced Imaging Laboratories, Duke Clinical Imaging Physics Group, Department of Radiology, Duke University Medical Center, Durham, NC (United States)

    2014-06-01

    Purpose: In a large, academic medical center, consistent radiographic imaging performance is difficult to routinely monitor and maintain, especially for a fleet consisting of multiple vendors, models, software versions, and numerous imaging protocols. Thus, an automated image quality control methodology has been implemented using routine image quality assessment with a physical, stylized anthropomorphic chest phantom. Methods: The “Duke” Phantom (Digital Phantom 07-646, Supertech, Elkhart, IN) was imaged twice on each of 13 radiographic units from a variety of vendors at 13 primary care clinics. The first acquisition used the clinical PA chest protocol to acquire the post-processed “FOR PRESENTATION” image. The second image was acquired without an antiscatter grid followed by collection of the “FOR PROCESSING” image. Manual CNR measurements were made from the largest and thickest contrast-detail inserts in the lung, heart, and abdominal regions of the phantom in each image. An automated image registration algorithm was used to estimate the CNR of the same insert using similar ROIs. Automated measurements were then compared to the manual measurements. Results: Automatic and manual CNR measurements obtained from “FOR PRESENTATION” images had average percent differences of 0.42%±5.18%, −3.44%±4.85%, and 1.04%±3.15% in the lung, heart, and abdominal regions, respectively; measurements obtained from “FOR PROCESSING” images had average percent differences of -0.63%±6.66%, −0.97%±3.92%, and −0.53%±4.18%, respectively. The maximum absolute difference in CNR was 15.78%, 10.89%, and 8.73% in the respective regions. In addition to CNR assessment of the largest and thickest contrast-detail inserts, the automated method also provided CNR estimates for all 75 contrast-detail inserts in each phantom image. Conclusion: Automated analysis of a radiographic phantom has been shown to be a fast, robust, and objective means for assessing radiographic

  8. An anthropomorphic phantom for quality assurance and training in gynaecological brachytherapy

    International Nuclear Information System (INIS)

    Background and purpose: An anthropomorphic water filled polymethylmethacrylate (PMMA) phantom designed to serve as a Quality Assurance (QA) tool and a training aid in brachytherapy of gynaecological tumours is investigated and presented. Several dosimetric parameters associated with the dose rate calculation can be verified with the aid of this phantom such as the source positioning, its imaging reconstruction from radiographs and the accuracy of the algorithm used for manual or computer dose rate calculation. Material and methods: The phantom walls and the internal structure are 5 mm thick and consist of PMMA, in the form of the abdomen taken from a female Alderson Phantom Marker points representing the organs of interest were determined from computed tomography scans of a patient of similar size. Three PMMA inserts designed to hold a Farmer type ionization chamber of 0.6 cm3 were positioned at the points to represent the bladder, rectum and point A. The formalism proposed by the IAEA TRS-277 dosimetry protocol was used for the conversion of readings of the ionization chamber to dose rate values with a modification to take into account the dose rate gradient in the detector. Five 137Cs sources were used and the dose rate was evaluated by measurements and Monte Carlo simulations using the PENELOPE code. Four different treatment planning systems with different algorithms and source reconstruction techniques were also used in this investigation and compared with the manual dose rate calculations made using Karen and Breitman's tables. Results: The dose rate calculations performed with Monte Carlo and the four treatment planning systems are in good agreement with the experimental results as well as with the manual calculations when the colpostat shielding and the tandem attenuation are taken into account. The comparison between experiment and calculations by the four treatment planning systems shows a maximum variation of 5.1% between the calculated and measured dose

  9. Pediatric radiation dosimetry for positron-emitting radionuclides using anthropomorphic phantoms

    Energy Technology Data Exchange (ETDEWEB)

    Xie, Tianwu [Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211 Geneva 4 (Switzerland); Bolch, Wesley E. [Departments of Biomedical Engineering, University of Florida, Gainesville, Florida 32611 (United States); Lee, Choonsik [Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institute of Health, Rockville, Maryland 20850 (United States); Zaidi, Habib [Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211 Geneva 4 (Switzerland); Geneva Neuroscience Center, Geneva University, CH-1205 Geneva (Switzerland); Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, 9700 RB Groningen (Netherlands)

    2013-10-15

    Purpose: Positron emission tomography (PET) plays an important role in the diagnosis, staging, treatment, and surveillance of clinically localized diseases. Combined PET/CT imaging exhibits significantly higher sensitivity, specificity, and accuracy than conventional imaging when it comes to detecting malignant tumors in children. However, the radiation dose from positron-emitting radionuclide to the pediatric population is a matter of concern since children are at a particularly high risk when exposed to ionizing radiation.Methods: The authors evaluate the absorbed fractions and specific absorbed fractions (SAFs) of monoenergy photons/electrons as well as S-values of 9 positron-emitting radionuclides (C-11, N-13, O-15, F-18, Cu-64, Ga-68, Rb-82, Y-86, and I-124) in 48 source regions for 10 anthropomorphic pediatric hybrid models, including the reference newborn, 1-, 5-, 10-, and 15-yr-old male and female models, using the Monte Carlo N-Particle eXtended general purpose Monte Carlo transport code.Results: The self-absorbed SAFs and S-values for most organs were inversely related to the age and body weight, whereas the cross-dose terms presented less correlation with body weight. For most source/target organ pairs, Rb-82 and Y-86 produce the highest self-absorbed and cross-absorbed S-values, respectively, while Cu-64 produces the lowest S-values because of the low-energy and high-frequency of electron emissions. Most of the total self-absorbed S-values are contributed from nonpenetrating particles (electrons and positrons), which have a linear relationship with body weight. The dependence of self-absorbed S-values of the two annihilation photons varies to the reciprocal of 0.76 power of the mass, whereas the self-absorbed S-values of positrons vary according to the reciprocal mass.Conclusions: The produced S-values for common positron-emitting radionuclides can be exploited for the assessment of radiation dose delivered to the pediatric population from various PET

  10. Hearing results with clothespin ossiculoplasty: preliminary report on the Kraus Modified Schuring Ossicle-Cup Prosthesis (Clothespin Prosthesis).

    Science.gov (United States)

    Kraus, E M

    1993-07-01

    The clothespin partial ossicular replacement prosthesis (PORP) is designed to increase joint stability during incus replacement ossiculoplasty. Fundamental modifications have been made in the Schuring ossicle-cup, which include a forked well, increased well wall thickness and length, and a flexible tip disk added to the shaft. The forked well functions like a straight clothespin rather than an inverted cup. The forked well enables the clothespin prothesis to slide down over the stapes superstructure, between the facial nerve canal and the promontory, to form a stable, mortise-and-tenon prosthesis-stapedial joint. Joint stability is enhanced because the inferior tine of the forked well is able to lever against the inferior surface of the stapes superstructure, creating a counterforce to gravity. This is in contrast to the more unstable ball-and-socket joint created by most partial ossicular replacement prostheses when they articulate with the stapes capitulum. The addition of a flexible disk to the shaft tip produces a tight, stable union between the prosthesis and the ossicular cap by increasing resistance at the shaft-ossicle interface. Fluoroplastic composition maximizes intraoperative versatility and reliability while the ossicle cap minimizes extrusions. One-year hearing results for twelve chronic ear patients with mobile stapes undergoing clothespin ossiculoplasty during intact canal wall tympanomastoidectomy revealed postoperative air-bone gaps within 20 dB in 92% of cases. The mean postoperative air-bone gap was 8.9 dB, and the mean improvement in air-bone gap was 14.4 dB.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:8336964

  11. Randomized comparison of operator radiation exposure comparing transradial and transfemoral approach for percutaneous coronary procedures: rationale and design of the minimizing adverse haemorrhagic events by TRansradial access site and systemic implementation of angioX – RAdiation Dose study (RAD-MATRIX)

    International Nuclear Information System (INIS)

    Background: Radiation absorbed by interventional cardiologists is a frequently under-evaluated important issue. Aim is to compare radiation dose absorbed by interventional cardiologists during percutaneous coronary procedures for acute coronary syndromes comparing transradial and transfemoral access. Methods: The randomized multicentre MATRIX (Minimizing Adverse Haemorrhagic Events by TRansradial Access Site and Systemic Implementation of angioX) trial has been designed to compare the clinical outcome of patients with acute coronary syndromes treated invasively according to the access site (transfemoral vs. transradial) and to the anticoagulant therapy (bivalirudin vs. heparin). Selected experienced interventional cardiologists involved in this study have been equipped with dedicated thermoluminescent dosimeters to evaluate the radiation dose absorbed during transfemoral or right transradial or left transradial access. For each access we evaluate the radiation dose absorbed at wrist, at thorax and at eye level. Consequently the operator is equipped with three sets (transfemoral, right transradial or left transradial access) of three different dosimeters (wrist, thorax and eye dosimeter). Primary end-point of the study is the procedural radiation dose absorbed by operators at thorax. An important secondary end-point is the procedural radiation dose absorbed by operators comparing the right or left radial approach. Patient randomization is performed according to the MATRIX protocol for the femoral or radial approach. A further randomization for the radial approach is performed to compare right and left transradial access. Conclusions: The RAD-MATRIX study will probably consent to clarify the radiation issue for interventional cardiologist comparing transradial and transfemoral access in the setting of acute coronary syndromes

  12. Randomized comparison of operator radiation exposure comparing transradial and transfemoral approach for percutaneous coronary procedures: rationale and design of the minimizing adverse haemorrhagic events by TRansradial access site and systemic implementation of angioX – RAdiation Dose study (RAD-MATRIX)

    Energy Technology Data Exchange (ETDEWEB)

    Sciahbasi, Alessandro, E-mail: alessandro.sciahbasi@fastwebnet.it [Interventional Cardiology, Sandro Pertini Hospital – ASL RMB, Rome (Italy); Calabrò, Paolo [Division of Cardiology - Department of Cardio-Thoracic Sciences - Second University of Naples (Italy); Sarandrea, Alessandro [HSE Management, Rome (Italy); Rigattieri, Stefano [Interventional Cardiology, Sandro Pertini Hospital – ASL RMB, Rome (Italy); Tomassini, Francesco [Department of Cardiology, Infermi Hospital, Rivoli (Italy); Sardella, Gennaro [La Sapienza University, Rome (Italy); Zavalloni, Dennis [UO Emodinamica e Cardiologia Invasiva, IRCCS, Istituto Clinico Humanitas, Rozzano (Italy); Cortese, Bernardo [Interventional Cardiology, Fatebenefratelli Hospital, Milan (Italy); Limbruno, Ugo [Cardiology Unit, Misericordia Hospital, Grosseto (Italy); Tebaldi, Matteo [Cardiology Department, University of Ferrara, Department of Cardiology (Italy); Gagnor, Andrea [Department of Cardiology, Infermi Hospital, Rivoli (Italy); Rubartelli, Paolo [Villa Scassi Hospital, Genova (Italy); Zingarelli, Antonio [San Martino Hospital, Genova (Italy); Valgimigli, Marco [Thoraxcenter, Rotterdam (Netherlands)

    2014-06-15

    Background: Radiation absorbed by interventional cardiologists is a frequently under-evaluated important issue. Aim is to compare radiation dose absorbed by interventional cardiologists during percutaneous coronary procedures for acute coronary syndromes comparing transradial and transfemoral access. Methods: The randomized multicentre MATRIX (Minimizing Adverse Haemorrhagic Events by TRansradial Access Site and Systemic Implementation of angioX) trial has been designed to compare the clinical outcome of patients with acute coronary syndromes treated invasively according to the access site (transfemoral vs. transradial) and to the anticoagulant therapy (bivalirudin vs. heparin). Selected experienced interventional cardiologists involved in this study have been equipped with dedicated thermoluminescent dosimeters to evaluate the radiation dose absorbed during transfemoral or right transradial or left transradial access. For each access we evaluate the radiation dose absorbed at wrist, at thorax and at eye level. Consequently the operator is equipped with three sets (transfemoral, right transradial or left transradial access) of three different dosimeters (wrist, thorax and eye dosimeter). Primary end-point of the study is the procedural radiation dose absorbed by operators at thorax. An important secondary end-point is the procedural radiation dose absorbed by operators comparing the right or left radial approach. Patient randomization is performed according to the MATRIX protocol for the femoral or radial approach. A further randomization for the radial approach is performed to compare right and left transradial access. Conclusions: The RAD-MATRIX study will probably consent to clarify the radiation issue for interventional cardiologist comparing transradial and transfemoral access in the setting of acute coronary syndromes.

  13. Optimal control for the active above-knee prosthesis.

    Science.gov (United States)

    Popović, D; Oğuztöreli, M N; Stein, R B

    1991-01-01

    Control of an active above-knee prosthesis has been simulated for a selected gait activity using a hierarchical closed-loop method. An extension of finite-state control, referred to as artificial reflex control, was adopted at the strategic level of control. At the actuator level of control an optimal tracking method, based on dynamic programming, is applied. This deals mainly with the actuator level of control, but considers the interaction of the leg dynamics and the switching effects of artificial reflex control. Optimal tracking at the actuator level of the above-knee prosthesis reduces the on-off effects of finite-state methods, such as artificial reflex control. The proposed method can also be used for the design of prosthetic elements. Specific attention is paid to the limited torque and power in the prosthetic joint actuator, which are imposed by the principle of self-containment in the artificial leg. The hierarchical structure, integrating artificial reflex control and optimal tracking, can be used in real time, as estimated from the number of computer operations required for the suggested method. PMID:2048773

  14. Surgical treatment of early acute thrombosis of mechanical mitral prosthesis.

    Science.gov (United States)

    Jiang, Shengli; Zhang, Tao; Ren, Chonglei; Wang, Yao

    2010-10-01

    Prosthetic valve thrombosis is a rare but life threatening complication of mechanical heart valve prosthesis. A 44-year-old woman diagnosed with rheumatic heart disease with severe mitral valve stenosis, moderate tricuspid valve insufficiency, and atrial fibrillation underwent transseptal mitral valve replacement and tricuspid valvuloplasty in our department. Heparin and warfarin were routinely used postoperatively. Although the international normalized ratio (INR), activated partial thromboplastin time ratio, and platelet count were satisfactory, the patient presented with severe dyspnea suddenly 10 days after discharge; echocardiogram showed that the prosthetic posterior leaflet was immobile. The patient suffered cardiac arrest suddenly during the examination and cardiopulmonary resuscitation was carried out successfully. Emergent surgery was performed, confirming the prosthetic valve thrombosis. The prosthetic valve was replaced with another mechanical prosthesis. The patient recovered smoothly and was discharged 14 days later with atrial fibrillation. During the 12-months follow-up period, her prosthetic valve and heart function were normal with INR around 3.0. This case highlights the need for awareness among clinicians for the possibility of valve thrombosis in the early postoperative period. PMID:20961833

  15. AUTONOMOUS CT REPLACEMENT METHOD FOR THE SKULL PROSTHESIS MODELLING

    Directory of Open Access Journals (Sweden)

    Marcelo Rudek

    2015-12-01

    Full Text Available The geometric modeling of prosthesis is a complex task from medical and engineering viewpoint. A method based on CT replacement is proposed in order to circumvent the related problems with the missing information to modeling. The method is based on digital image processing and swarm intelligence algorithm. In this approach, a missing region on the defective skull is represented by curvature descriptors. The main function of the descriptors is to simplify the skull’s contour geometry; and they are defined from the Cubic Bezier Curves using a meta-heuristic process for parameter’s estimation. The Artificial Bee Colony (ABC optimization technique is applied in order to evaluate the best solution. The descriptors from a defective CT slice image are the searching parameters in medical image databases, and a similar image, i.e. with similar descriptors, can be retrieval and used to replace the defective slice. Thus, a prosthesis piece is automatically modeled with information extracted from distinct skulls with similar anatomical characteristics.

  16. Hearing improvement after stapedotomy using teflon loop prosthesis

    International Nuclear Information System (INIS)

    To assess hearing improvement after stapedotomy for otosclerosis using teflon loop prosthesis. Thirty diagnosed cases of otosclerosis were included in the study. Ear with greater air-bone gap was selected and stapedotomy was done using teflon loop prosthesis (size 4 - 4.5 mm). Mild vertigo occurred during immediate postoperative period, which subsided with Inj. Prochlorperazine. Patients were followed-up postsurgically at one month, two months, four months, six months and one year and postoperative air-bone gap was calculated. Out of 30 cases, there were 24 males and 06 females. The age ranged from 18 to 50 years. Twenty-one (70%) patients had bilateral hearing loss and 09 (30%) had tinnitis also. Pre-operative audiograms showed conductive deafness. Carhart's notch was present in 10 (33.3%) cases. Tympanogram revealed loss of stapedial reflex. Postoperatively good hearing improvement was seen in 56.7% (postoperative air-bone gap closure upto 10 dB), fair improvement in 30% (postoperative air bone gap closure from 11 to 20 dB) and poor results in 10% (postoperative air-bone gap more than 21 dB) cases. One patient developed dead ear. (author)

  17. Simultaneous penile prosthesis and male sling/artificial urinary sphincter.

    Science.gov (United States)

    Lee, Dominic; Romero, Claudio; Alba, Frances; Westney, O Lenaine; Wang, Run

    2013-01-01

    Erectile dysfunction (ED) and stress urinary incontinence (SUI) from urethral sphincteric deficiency is not an uncommon problem. The commonest etiology is intervention for localized prostate cancer and/or radical cystoprostatectomy for muscle invasive bladder cancer. Despite advances in surgical technology with robotic assisted laparoscopic prostatectomy and nerve sparing techniques, the rates of ED and SUI remain relatively unchanged. They both impact greatly on quality of life domains and have been associated with poor performance outcomes. Both the artificial urinary sphincter and penile prosthesis are gold standard treatments with proven efficacy, satisfaction and durability for end-stage SUI and ED respectively. Simultaneous prosthesis implantation for concurrent conditions has been well described, mostly in small retrospective series. The uptake of combination surgery has been slow due in part to technical demands of the surgery and to an extent, a heightened anxiety over potential complications. This paper aims to discuss the technical aspect of concurrent surgery for both disease entity and the current published outcomes of the various surgical techniques with this approach. PMID:23202702

  18. Simultaneous penile prosthesis and male sling/artificial urinary sphincter

    Institute of Scientific and Technical Information of China (English)

    Dominic Lee; Claudio Romero; Frances Alba; O Lenaine Westney; Run Wang

    2013-01-01

    Erectile dysfunction (ED) and stress urinary incontinence (SUI) from urethral sphincteric deficiency is not an uncommon problem.The commonest etiology is intervention for localized prostate cancer and/or radical cystoprostatectomy for muscle invasive bladder cancer.Despite advances in surgical technology with robotic assisted laparoscopic prostatectomy and nerve sparingtechniques,the rates of ED and SUI remain relatively unchanged.They both impact greatly on quality of life domains and have been associated with poor performance outcomes.Both the artificial urinary sphincter and penile prosthesis are gold standard treatments with proven efficacy,satisfaction and durability for end-stage SUI and ED respectively.Simultaneous prosthesis implantation for concurrent conditions has been well described,mostly in small retrospective series.The uptake of combination surgery has been slow due in part to technical demands of the surgery and to an extent,a heightened anxiety over potential complications.This paper aims to discuss the technical aspect of concurrent surgery for both disease entity and the current published outcomes of the various surgical techniques with this approach.

  19. Cosmetic effect of knee joint in a knee disarticulation prosthesis.

    Science.gov (United States)

    de Laat, Fred A; van der Pluijm, Mark J; van Kuijk, Annette A; Geertzen, Jan H; Roorda, Leo D

    2014-01-01

    Despite numerous advantages, knee disarticulations (KDs) are rarely performed because of the anticipated KD prosthesis fitting problems that include the positioning of the knee joint distally from the KD socket. This results in lengthening of the thigh and subsequent shortening of the shank. The objective of this study was to assess the cosmetic effect of the knee joint in a KD prosthesis by determining the extent of the lengthening of the thigh and the shortening of the shank. This lengthening and shortening were measured through an experimental setup using laser techniques. These measurements were made of 18 knee joints used in KD prostheses. Lengthening of the thigh varied between 23 and 92 mm, and shortening of the shank varied between 3 and 50 mm. The polycentric knees Medi KH6 and Medi KHF1 showed the least lengthening of the thigh, and the polycentric knees Teh Lin Prosthetic & Orthotic Co. Ltd Graph-Lite and Medi KP5 showed the least shortening of the shank. PMID:25856500

  20. The effect of surgical titanium rods on proton therapy delivered for cervical bone tumors: experimental validation using an anthropomorphic phantom

    International Nuclear Information System (INIS)

    To investigate the effect of metal implants in proton radiotherapy, dose distributions of different, clinically relevant treatment plans have been measured in an anthropomorphic phantom and compared to treatment planning predictions. The anthropomorphic phantom, which is sliced into four segments in the cranio-caudal direction, is composed of tissue equivalent materials and contains a titanium implant in a vertebral body in the cervical region. GafChromic® films were laid between the different segments to measure the 2D delivered dose. Three different four-field plans have then been applied: a Single-Field-Uniform-Dose (SFUD) plan, both with and without artifact correction implemented, and an Intensity-Modulated-Proton-Therapy (IMPT) plan with the artifacts corrected. For corrections, the artifacts were manually outlined and the Hounsfield Units manually set to an average value for soft tissue. Results show a surprisingly good agreement between prescribed and delivered dose distributions when artifacts have been corrected, with > 97% and 98% of points fulfilling the gamma criterion of 3%/3 mm for both SFUD and the IMPT plans, respectively. In contrast, without artifact corrections, up to 18% of measured points fail the gamma criterion of 3%/3 mm for the SFUD plan. These measurements indicate that correcting manually for the reconstruction artifacts resulting from metal implants substantially improves the accuracy of the calculated dose distribution. (paper)