40 results about "Transfemoral prosthesis" patented technology

A patellar implant for total or partial prosthesis of the knee joint incorporates an outer articular surface and an inner articular surface provided to cooperate respectively with an outer side and an inner side of a femoral trochlea or of a femoral prosthetic component. The inner and outer articular surfaces are separated by a transition ridge which is curved, as viewed from a front of the implant, so as to be concave facing the outer articular surface. The outer articular surface is concave in a plane parallel to a sagittal plane and in a transverse plane of the knee joint.

A hip resurfacing femoral prosthesis has a sleeve component with an internal bore adapted to receive a femoral head and a partially conical outer surface. The sleeve is for use with a mating partial ball component shaped to conform to an acetabular socket. The sleeve is slotted or segmented to enhance the engagement with the femoral head. The partial ball component may be translated proximally and distally to reposition the outer surface by selecting sleeves with varying geometries.

In an artificial limb system having an actuator coupled to a joint for applying a torque characteristic thereto, a control bandwidth of a motor controller for a motor included in the actuator can be increased by augmenting a current feedback loop in the motor controller with a feed forward of estimated back electromotive force (emf) voltage associated with, the motor. Alternatively, the current loop is eliminated and replaced with a voltage loop related to joint torque. The voltage loop may also be augmented with the feed forward of estimated back emf, to improve the robustness of the motor controller.

The invention relates to a system for designing an individual artificial knee joint prosthesis based on parameter driving, in particular to individual parameter driving of a femoral prosthesis model and belongs to the field of design of medical products. The system for designing the individual artificial knee joint prosthesis based on parameter driving is based on the interactive visual medical image processing and computerized design technique. According to the system for designing the individual artificial knee joint prosthesis based on parameter driving, a skeleton model is re-constructed by means of an interactive medical image processing module, and bone morphology parameter values are obtained through measurement; individual parameters of prosthesis design are analyzed through a femoral prosthesis individual parameter analyzing module; parametric modeling of prosthesis individual parameters is completed by establishing a parameter expression, establishing a parameter preliminary sketch, adding constraint, scanning and the like; the femoral prosthesis parameters are adjusted, and matching verification of the prosthesis design is conducted. According to the system, individual modeling of the prosthesis can be achieved by automatically modifying variables according to the actual physiological characteristic parameter of a patient, both design quality and design efficiency can be improved, products can be designed and manufactured according to the shapes and sizes of bones of different patients, and both production requirement and practical clinic requirements are met.

Disclosed are a medial femoral unicondylar prosthesis (201), a femoral lateral unicondylar prosthesis (301), and a femoral trochlear prosthesis (401). The medial femoral unicondylar prosthesis includes: the articular surface, which is the surface in contact with the inner side of the patella and the inner side of the tibial plateau during the movement of the knee joint. arc segment (203), which is shown as arc segment (95) on the first circle (94) on the coronal position; The portion of the surface and the bone cement is shown as the medial posterior condyle (202) of the linear section, and the medial distal end (209) consistent with the articular surface arc (203). The prosthesis using the above embodiments of the present disclosure can be closer to the geometry of the femoral condyle of a normal human body, and simplifies the design parameter values ​​of various types of femoral prostheses.

A femoral prosthesis. The femoral prosthesis includes an implant body having a proximal end and a distal end and a shoulder at the proximal end, the shoulder being structured and dimensioned for a tight press fit into the neck of a femur. The implant body includes a trunk at the distal end, the trunk having a wedge formed by a tapered portion extending in the direction of the distal end of the implant body. The implant body also includes a medial column extending from the shoulder toward the distal end and a lateral column extending from the shoulder toward the distal end. The wedge, the medial column, and the lateral column to provide multi-planar stability for the implant body and surface area for fixation of the implant body.

The present invention provides a femoral component, and a method for surgical implantation of a femoral prosthesis, comprised of a revision knee implant and corresponding cutting block system. In particular, the revision knee implant, comprised of a femoral component having incremental markings thereon and a femoral stem, and corresponding cutting block system having corresponding incremental markings thereon, enables a surgeon maximally to position the cutting block adjacent as much area as possible of a distal femur of a patient and to infinitely position the femoral component in the exact position indicated by the cutting block.

We present a novel swing phase control module for powered transfemoral prostheses based on minimum jerk theory. The control module allows physiologically appropriate swing movement at any walking speed, regardless of the stance controller action. Preliminary validation in a transfemoral amputee subject demonstrates that the control module provides physiological swing timing, without speed or patient-specific tuning.

The invention provides a restoring device of femoral prosthesis in hip arthroplasty. The restoring device comprises a hook pressure part, a prying part and a fixing part, a change-over part is arranged between the hook pressure part and the prying part, and the hook pressure part, the prying part, the fixing part and the change-over part are structurally assembled and connected with a lateral crossbeam of a surgical bed, so that the femoral prosthesis can be restored into the acetabular conveniently in the hip arthroplasty. The restoring device is simple in structure, easy to restore and convenient in surgical operation, and thereby saving the physical strength of operators.

The invention provides a hip joint prosthesis and solves the problems that parts of fastening nails of bone grafts in periacetabular osteotomy interfere with a hip joint prosthesis to cause fixing inconvenience of the bone grafts or the hip joint prosthesis and further to cause the impossibility of reaching an optimum fixing position in the prior art and that an existing total hip femoral prosthesis is not applicable to all DDH (Developmental Dysplasia Of The Hip) patients. The hip joint prosthesis comprises an acetabular cup for fixing inside an acetabulum, an eccentric acetabular liner for increasing the range of motion of the hip joint prosthesis and arranged inside the acetabular cup, a ball heat playing the role of a femoral head and arranged inside the eccentric acetabular liner and a stable femoral stem for being fixed onto a cuboid and connected with the ball head. By means of the above technical scheme, the hip joint prosthesis can be arranged in the optimum fixing position and meets the requirements on prostheses required by operations of the DDH patients.

A method of implanting a lateral unicondylar knee prosthesis in a lateral articulating portion of a femur having a lateral condyle for engagement with a tibia, the method including the steps of: bending a patients knee such that the knee is not in full extension; making an incision through the skin, muscle, and other soft tissue until the damaged bone surfaces are exposed; resecting an end portion of the lateral tibia; resecting an end portion of the lateral femoral condyle; attaching a tibial prosthetic component to the resected end portion of the tibia; attaching a lateral femoral condyle prosthetic component to the resected end portion of the lateral femoral condyle; determining the thickness of a mobile bearing member with the knee in full extension; and inserting the mobile bearing member between the tibial prosthetic component and the femoral prosthetic component.

The invention discloses a femur prosthesis assembly system suitable for different types of femur malformation and defects. The system comprises a femoral condyle prosthesis, an extension shank prosthesis and an assembled metal wedge-shaped cushion block, wherein the femoral condyle prosthesis comprises a joint surface, condyle bonding surfaces, a femur marrow inner shank and an intercondylar bonding surface; the joint surface and the condyle bonding surfaces adopt an integral structure; the intercondylar bonding surface is arranged between the condyle bonding surfaces; the femur marrow inner shank is arranged in the intercondylar bonding surface; the metal wedge-shaped cushion block comprises a femur rear condyle cushion block and a distal femoral cushion block which are both matched with the condyle bonding surfaces; the upper end of the extension shank prosthesis extends into the femur marrow inner shank for connection and fixation. Due to the femoral condyle prosthesis, the assembled metal wedge-shaped cushion block and the extension shank prosthesis, the parts of the system can be assembled into various types of prostheses in an operation, so as to meet the custom-made prosthesis requirements of patients with various bone defects, and to ensure precise combination and ideal healing effect.

Disclosed is a foldable wheel type intelligent rapid walking artificial thigh. The foldable wheel type intelligent rapid walking artificial thigh is composed of a left leg part and a right leg part, which are in the same structure and are respectively composed of a sole unit, a parallel mechanism, two first stepping motor, two foldable wheel units, a shank support column, a first air cylinder, a thigh support column, a thigh sleeve, two fastening belts, two fasteners, a silicon rubber soft case and two fixing rings. The foldable wheel type intelligent rapid walking artificial thigh has the following advantages of achieving flexible movement of ankles through the unique parallel mechanisms, and by means of the special foldable wheel units, conveniently and rapidly achieving rapid walking ofa wearer and meanwhile saving the space to the maximum degree and reduce the weight.

The invention discloses an artificial femoral prosthesis, which consists of a femoral stem (1), bone grafts (2) and an outer sleeve (3). Particularly, the outer sleeve (3) is implanted into the medullary space of femora (4); a femoral stem far end (5) is inserted into an outer sleeve track (6); and the gap between the outer sleeve (3) and the femora (4) is filled with the bone grafts (2). The aimof the invention is that: through long term fusion of the femora (4) and the bone grafts (2), the artificial femoral prosthesi bears the stress from a femoral stem collar (7); through the annular design of the outer sleeve track (6), after the femoral stem collar (7) is stressed, inside displacement (8) is smaller than outside displacement (9), so that the stress outside the femora is larger; by controlling the contact position of the outer sleeve track (6) and the femoral stem far end (5), the stress of the femora (4) is distributed close to the natural state; through anatomy covering of thefemoral stem collar (7), grains are prevented from entering the bone-prosthesis joint surface; and by changing the shape size of the outer sleeve (3), the artificial femoral prosthesis adapts to different medullary spaces and indications.