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.

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.

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.

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.

The invention discloses a medial femoral single condyle prosthesis (201), a lateral femoral single condyle prosthesis (301), and a femoral trochlea prosthesis (401). The medial femoral single condyle prosthesis comprises an articular surface which is a surface making contact with the medial patella and the medial tibial plateau during the knee joint motion process, wherein the articular surface is presented as a segmental arc (203) on a first ellipse (38) on the sagittal position, and is presented as a segmental arc (95) on a first circle (94) on a coronal position; and an inside surface, which is the part adjoining femoral condyle cut bone surface and bone cement after prosthesis implantation, and is presented as a medial posterior condyle (202) with a straight line section and a medial distal end (209) consistent with the segmental arc (203). The prosthesis can be closer to the geometric shape of the normal human femoral condyle, and design parameter values of femoral prostheses of various types are simplified.

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.

An intelligent bionic knee joint is used for being connected between an above-knee prosthesis and a below-knee prosthesis and comprises a connector, a knee joint simulation device, a first air pressure damping device, a detection device and a second air pressure damping device. The connector is fixedly connected with the above-knee prosthesis, the knee joint simulation device is fixedly arranged below the connector and used for simulating a human prosthesis, the first air pressure damping device cooperates with the knee joint simulation device in operation, the detection device is used for detecting a current moving state, and the second air pressure damping device responds to the detection device to adjust air pressure damping. Therefore, real-time adjustment of knee joint movement statesaccording to human walking speeds can be realized.

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 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 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 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 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.