39 results about "Transfemoral prosthesis" patented technology

A knee prosthesis includes a femoral prosthetic part which forms a pair of condylar gliding surfaces, a tibial part that has tibial gliding surfaces cooperating with the condylar gliding surfaces and a coupling part that connects the femoral and tibial parts so that they can rotate about a rotational axis that is approximately parallel to the axis of the tibia. If the femoral and tibial parts have the same anteroposterior alignment, an applied load is borne by a central region of the tibial gliding surfaces. The tibial gliding surface slopes upwardly relative to the prosthesis both in front of and behind the central region of the tibial gliding surface so that when the femoral and tibial parts rotate against one another, each of the condylar gliding surfaces remains in contact with its corresponding tibial gliding surface.

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 present invention relates to a femoral prosthesis that includes a cement introduction port which may be used to facilitate delivery or introduction of bone cement into the prosthesis/bone interface after the prosthesis component has been placed on a resurfaced femur bone. The femoral prosthesis may have a keel with undercuts which are configured to assist in controlling the flow of bone cement during implantation and to improve stability of the prosthesis following implantation. The femoral prosthesis is suitable for implantation using arthroscopic, as well as open, surgical procedures. The present prostheses may be used as unicondylar implants in either compartment of the knee or in both compartments of the knee.

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.

A femoral prosthesis for use during a revision procedure includes a proximal body, a distal stem, a modular neck, and a head. In operation, a surgeon may stabilize the proximal body and the distal stem of the prosthesis in a patient's femoral canal that has moderate loss of metaphyseal cancellous bone (known as a Paprosky Type I femoral defect), extensive loss of metaphyseal cancellous bone (known as a Paprosky Type II femoral defect), or extensive metaphyseal deterioration and some diaphyseal deterioration (known as a Paprosky Type IIIA femoral defect). Without disturbing this arrangement, the surgeon may then position the head in a desired location by selecting a desired modular neck to obtain proper joint kinematics.

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.

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 aim of 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 the femoral 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.

An intelligent bionic knee joint, which is used to be connected between a thigh prosthesis and a calf prosthesis, which includes a connecting piece fixedly connected to the thigh prosthesis, and a knee joint simulation fixedly arranged under the connecting piece for simulating a human prosthesis device, an air pressure damping device working in cooperation with the knee joint simulation device, a detection device for detecting the current moving state, and an air pressure damping device for adjusting the air pressure damping in response to the detection device, so as to realize real-time adjustment of the knee joint according to the walking pace of the human body The effect of exercise state.

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 prosthesis for a femur which can enable or allow deep knee flexion without creating excessive tension in the ligamentous structure of the knee. The femoral prosthesis includes an internal non-articulating surface, an external articulating surface, a medial condyle and a lateral condyle. The height of the medial condyle is less than the height of the lateral condyle. A proximal-posterior tip of the medial condyle is rounded and is shifted inwards relative to the native level of the proximal-posterior region of the femur bone to facilitate knee flexion. A method of mounting a femoral prosthesis on a femur is also described.

The invention discloses a double-acting type artificial knee joint prosthesis comprising a femur prosthesis, a tibia prosthesis and a three-way fixing piece, wherein the three-way fixing piece comprises a cylindrical shaft and a three-way shaft sleeve; the three-way shaft sleeve comprises a cylindrical sleeve and a supporting column, the cylindrical sleeve is sleeved on the cylindrical shaft, one end of the supporting column is fixedly arranged at the middle point of the cylindrical sleeve, the supporting column is vertical to the axis of the cylindrical sleeve, and one end, far away the cylindrical sleeve, of the supporting column forms a spherical bulge; a connection part of the femur prosthesis and the three-way fixing piece forms double lugs to cover the outer side of the cylindrical sleeve, and the double lugs are respectively fixedly connected with the cylindrical shaft; a connection part of the tibia prosthesis and the three-way fixing piece forms a spherical cup; a double-acting liner is arranged in the spherical cup, and the spherical bulge is fixed in the double-acting liner. According to the double-acting type artificial knee joint prosthesis disclosed by the invention, when the rebuilding of a knee joint is realized, the disadvantages that the stress of a rotary hinge type knee joint on the femur and the tibia is larger, and the motion degree of the knee joint is limited are overcome, the service life of the prosthesis is prolonged, and the adaption diseases and the applicable crowd of an artificial knee joint replacement are increased.

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.

The invention discloses prosthesis testing equipment and belongs to the technical field of prosthesis testing. The equipment includes a bottom plate, a ground transmission assembly, a thigh prosthesis, a crus prosthesis, a knee joint, a sole of the foot, a mounting plate, a driving assembly, a lifting assembly, a monitoring assembly, a collision assembly and four supporting columns. The ground transmission assembly is mounted at the top of the bottom plate. The four supporting columns are distributed at the top of the bottom plate in a rectangular shape. The mounting plate is fixedly connectedwith the top of the four supporting columns, and a rectangular groove is arranged on the mounting plate. The lifting assembly is arranged at the top of the mounting plate. The top end of the thigh prosthesis is hinged to the lifting assembly. The driving assembly is arranged on the mounting plate. The top of the crus prosthesis is connected to the bottom of the thigh prosthesis through the knee joint. The sole of the foot is connected with the bottom end of the crus prosthesis. The monitoring assembly is arranged on the bottom plate and the outer side wall of the mounting plate. The collisionassembly is arranged on the top of the mounting plate. The problem that the test result of existing prosthesis testing equipment cannot truly feedback performance of the knee joint is solved in the invention.

The invention discloses a knee joint prosthesis capable of being matched with a diseased knee joint. The knee joint prosthesis capable of being matched with the diseased knee joint comprises a femoral condyle (1), a platform mat and a platform holder. The platform mat comprises an inner condyle (2) and an outer condyle (3) which are arranged on the two sides respectively. The inner condyle and the outer condyle are integrally formed to form the platform mat. The thickness of an inner condyle platform mat body is larger than that of an outer condyle platform mat body so that the knee joint can move to perform outwards-turning movement. According to the knee joint prosthesis capable of being matched with the diseased knee joint, the knee joint can physiologically turn outwards by 6 degrees or so during movement. The individually-designed prosthesis is adopted, the platform mat can have an extremely high joint face shape suitability degree, mechanical stress of a joint face can be distributed on a larger area, the proportion of contact stress is reduced, and excessive abrasion of the platform mat is avoided; a fermoral prosthesis in the knee joint prosthesis and the platform mat are good in geometrical shape match, and therefore abnormal movement is obviously reduced, and the knee joint prosthesis can have more superior knee joint dynamics.

The invention provides a patella prosthesis. A patella main body is provided with a load-bearing side and a connecting side, and the connecting side of the patella main body is provided with a connecting part and an elastic part; by arranging the connecting part and the elastic part on the connecting side of the patella prosthesis, the combined patella prosthesis is more elastic. Stress conducted by a femur on a patella can be dispersed according to the arranged elastic part, the abrasion of the patella prosthesis and a femur prosthesis is reduced, the service life of the patella prosthesis is prolonged, and the pain of a patella ligament of a human body is relieved.