50 results about "Artificial knee" patented technology

The invention provides a medical implant, a preparation method thereof and an artificial knee joint. The medical implant comprises a macromolecular porous stent and a hydrogel composite material at least filled in pores of the macromolecular porous stent, and the material of the macromolecular porous stent comprises a degradable macromolecular material and carbon nanotubes distributed in the degradable macromolecular material. The hydrogel composite material comprises a hydrogel material matrix and seed cells distributed in the hydrogel material matrix. According to the invention, the degradable high polymer material and the hydrogel material are combined, the carbon nanotubes are introduced into the degradable high polymer material, and meanwhile, seed cells are arranged in a hydrogel material matrix, so that the implantable stent material which has proper degradation performance and good mechanical properties and is renewable is provided.

A knee joint prosthesis moves between an extended and flexion positions. The prosthesis includes a femoral component configured to be mounted to a femur, the femoral component having a femoral gear including a plurality of posts arranged along a helical trajectory. The prosthesis also includes a tibial component configured to (i) be mounted either directly or indirectly to a tibia, and (ii) engage the femoral component. The tibial component has a tibial gear including a plurality of recesses that are configured to mesh with the posts of the femoral gear. The tibial gear has two intersecting portions including a horizontally-oriented curved portion and a vertical portion, wherein each portion includes at least one of the recesses. The plurality of posts follow a helical trajectory to cause movement of the tibial component in either a medial or lateral direction as the knee joint prosthesis is moved to the extended position.

The invention relates to the technical field of balance systems, in particular to a load and gap balance system in a knee joint replacement operation. Mainly aiming at the problems that a doctor realizes symmetrical gap balance and ligament stress by virtue of a manual technology and subjective evaluation, an unsatisfactory result can be caused, and complications, such as instability, limited movement range and premature wear of an artificial knee joint prosthesis, are possibly caused, the following technical scheme is provided: the artificial knee joint comprises a knee joint, the knee joint comprises a femur and a tibia, and a medial collateral ligament and an lateral collateral ligament are connected between the femur and the tibia; the first osteotomy guider is used for cutting off the thighbone, the thighbone part of the first osteotomy guider is cut off to form a far-end osteotomy plane, and a thighbone prosthesis is installed at the position of the far-end osteotomy plane. According to the invention, the gap can be accurately measured, the ligament can be accurately tensioned, personalized alignment is realized, prosthesis selection is optimized, and the surgical effect of knee joint replacement, the satisfaction degree of a patient and the long-term durability of the prosthesis are effectively improved.

The application discloses a single-shaft active and passive mixed driving intelligent artificial knee joint structure with energy recovery function, which comprises a joint rotating module, a gear transmission module, a hydraulic damping module, a rack and a motor. The gear transmission module comprises a primary bevel gear transmission system, a secondary gear transmission system, a synchronous belt wheel transmission assembly and a transmission rack. The motor is fixed on the transmission rack. In the active stage, the motor provides an active driving torque for the knee joint through the gear transmission module and the joint rotating module. In the passive stage, the joint rotating module transmits a passive torque of the knee joint to the motor through the gear transmission module, drives the motor to rotate, so that the motor generates electricity to recover energy, and the hydraulic damping module provides a damping torque to ensure the stability of the knee joint. In various use occasions, the required damping or driving torque can be obtained, the power consumption of the motor can be reduced by recovering the passive torque of the knee joint in the passive stage, and the working endurance of the intelligent artificial limb is improved.

The application relates to a compact active artificial knee joint with a torque adjusting device, which comprises a knee joint module, a receiving cavity connecting block, a lower leg connecting piece and a torque adjusting device, wherein the torque adjusting device comprises a spiral spring, a bent spring groove and the like, the knee joint module comprises a knee joint shell, a knee joint shaft center, a knee joint stator sleeve end cover and the like, one end of the spring is fixed at the upper receiving cavity connecting lug through an opening on the motor stator sleeve end cover, and the other end is fixed in the bent spring groove at the position of the motor stator sleeve end cover and the knee joint shaft center. The torque adjusting device can realize torque assistance and adjustment according to the angle size and direction of the limb rotation; meanwhile, the driving peak torque of the motor can be reduced, the size and the maximum torque of the driving motor are smaller due to the fact that the artificial limb needs to be easily worn, energy consumption and space are saved.

A medical device for creating an artificial knee joint or an artificial cruciate ligament in a mammal patient, the medical device comprising a transversal member adapted to be placed through at least three layers of cortical bone of the distal portion of the femoral bone, out of totally four cortical layers along a prolongation of the transversal member. The transversal member is adapted to be involved in the artificial knee joint or the artificial cruciate ligament, wherein the transversal member comprises at least one fixation portion adapted to be involved in fixation of the transversal member to at least one of the at least four layers of femoral cortical bone.

This invention provides an experimental device for friction and wear testing of an artificial knee joint, belonging to the field of material friction and wear technology. It includes a lifting module, with a femoral clamping module at its top. The femoral clamping module contains a polyurethane elastomer sealed chamber, and a tibial clamping module is connected below this chamber. An intelligent temperature-controlled circulating hydraulic pump is located on one side of the polyurethane elastomer sealed chamber. This invention achieves reciprocating motion through a reversing valve control. Combined with sub-millimeter precision adjustment of the hydraulic actuator and differentiated installation positions, it realizes high-precision flexion, extension, and torsional movements of the artificial knee joint. A stable base load is provided by a central hydraulic loading module, while the unnecessary torque from the dual electromagnetic loading modules cancels each other out. Simultaneously, instantaneous impact force is superimposed on the stable hydraulic load through instantaneous power switching, enriching the loading methods of the experimental device for friction and wear testing of an artificial knee joint.

This application relates to the technical field of medical devices, and particularly to an artificial knee joint prosthesis. An artificial knee joint prosthesis includes: a tibial tray; a liner mounted on the tibial tray; a femoral condyle prosthesis, which includes a femoral condyle metal component and a femoral condyle ceramic component. The femoral condyle ceramic component covers the outer wall of the femoral condyle metal component. The femoral condyle ceramic component is in sliding fit with the liner. The inner wall of the femoral condyle metal component is a 3D printed trabecular bone structure, which can achieve biological fixation and bone ingrowth. This application has the effect of reducing the friction between the liner and the femoral condyle prosthesis, reducing the particles generated by polyethylene wear, thereby reducing the occurrence of inflammation in patients, avoiding bone cement reactions, and reducing the occurrence of postoperative pain and joint instability in patients.

The present invention relates to the technical field of medical devices applied to artificial knee joint replacement surgery, and discloses a pressure measurement device, a preparation method and a pressure measurement equipment. Among them, the pressure measurement device is used to measure the pressure between artificial knee joint prostheses, and includes a substrate, a plurality of sensing units arranged on the surface of the substrate, and a packaging layer covering the sensing units. The substrate is arranged between the femoral component and the tibial component. The sensing units are arranged on one side of the substrate facing the femoral component, and at least can cover the area where the surface of the substrate contacts the bicondyles of the femoral component. The sensing unit includes a bottom electrode layer, a piezoelectric material layer and a top electrode layer arranged in a direction away from the substrate. The sensing unit is configured to convert the pressure applied by the femoral component to the surface of the substrate into an electrical signal and transmit it to an external signal processing device for analysis and processing to determine the pressure information on the surface of the substrate.

To provide anti-luxation devices for a constrained prosthetic knee.SOLUTION: The techniques described herein relate to a prosthesis assembly. The prosthesis assembly may include a femoral component, a tibial bearing component engaged by the femoral component, and a tibial baseplate. The tibial baseplate can include a bushing received in a recess in the tibial baseplate, and a hinge post coupled to the femoral component and the bushing. The hinge post can be at least partially received by the bushing. The prosthesis assembly may include a capture element coupled to the tibial baseplate. The capture element can be engaged by at least one of the bushing and hinge post to limit distraction of the femoral component from the tibial bearing component and tibial baseplate.SELECTED DRAWING: Figure 3

This invention belongs to the field of knee joint friction testing technology, and discloses a wear testing machine and monitoring method for self-monitoring multi-degree-of-freedom motion of an artificial knee joint. The machine includes a frame and testing components. The testing components include a support base, a hydraulic cylinder, a hydraulic rod, a femoral end assembly, and a third motor. Below the femoral end assembly, a tibial end assembly, a centering platform, a pressure sensor, and a sliding platform are sequentially arranged. A second slide rail parallel to the support base is provided between the sliding platform and the frame. A monitoring device is installed on one corner of the frame near the centering platform. The pressure sensor is sleeved on a torsion shaft, and the other end of the torsion shaft is fixedly connected to a first reducer and a first motor. A crossbeam is fixedly connected to the bottom of the sliding platform, and the crossbeam is connected to a swinging component, which is also connected to a second reducer and a second motor. This invention adopts a design combining hydraulic, electric, and mechanical methods to achieve comprehensive simulation of the real multi-degree-of-freedom motion of the human knee joint.

To provide an artificial knee joint that may acquire properties close to a normal knee joint.SOLUTION: An artificial knee joint 1 includes: an insert member 2 embedded in a hole formed in part of a joint surface of a medial condyle MC or a lateral condyle LC of a tibia T; and a beam member 3 which is disposed downward the insert member 2, of which both ends have a length fixed to a cortical bone of the tibia T, and which supports the insert member 2 from a lower side.SELECTED DRAWING: Figure 1

Knee joint biomechanics and kinematics simulation machine, including frame, ankle joint simulation device, tibia fixing device, patellar tendon fixing device, hip joint simulation device, quadriceps femoris fixing device and femur fixing device; the ankle joint simulation device is arranged at the bottom of the frame, the ankle joint simulation device is connected with the tibia fixing device, the tibia fixing device is connected with the femur fixing device, the femur fixing device is connected with the hip joint simulation device, and the hip joint simulation device is arranged on the frame; the tibia fixing device and the femur fixing device are provided with the patellar tendon fixing device at the connecting position; the hip joint simulation device and the femur fixing device are provided with the quadriceps femoris fixing device at the connecting position. The invention provides a knee joint biomechanics and kinematics simulation machine to simulate the working condition of the lower limbs of human body under physiological activity conditions such as walking and squatting, and test and research the biomechanics and kinematics of natural knee joints and artificial knee joints.

The invention belongs to the technical field of knee joint friction tests, and discloses a self-monitoring artificial knee joint multi-degree-of-freedom motion wear testing machine and a monitoring method.The self-monitoring artificial knee joint multi-degree-of-freedom motion wear testing machine comprises a rack and a testing assembly, and the testing assembly comprises a supporting base, an oil cylinder, a hydraulic rod, a thighbone end assembly and a third motor; a tibia end assembly, a centering platform, a pressure sensor and a sliding platform are sequentially arranged below the thighbone end assembly, a second sliding rail parallel to the supporting base is arranged between the sliding platform and the rack, a monitoring device is arranged at the corner, close to the centering platform, of the rack, and a torsion shaft is sleeved with the pressure sensor. The other end of the torsion shaft is fixedly connected with the first reducer and the first motor; a beam is fixedly connected to the bottom of the sliding platform and connected with a swing part, and the swing part is further connected with a second speed reducer and a second motor. According to the invention, a hydraulic, electric and mechanical combined design mode is adopted, and omnibearing simulation is realized aiming at a real multi-degree-of-freedom motion mode of the knee joint of a human body.

The utility model belongs to the technical field of medical instruments, and discloses a gasket oblique locking type artificial knee joint tibia prosthesis which comprises a tibia support and a gasket, the tibia support is provided with a concave structure, the gasket is arranged towards the concave structure and movably connected with the tibia support, and the tibia support is provided with two positioning strips, a plurality of front fixing blocking pieces and a plurality of rear fixing blocking pieces. The positioning strips are gradually raised in the imbedding direction of the gasket, two limiting grooves are symmetrically distributed in the two sides of each positioning strip, the front fixing blocking piece and the rear fixing blocking piece are arranged on the extension lines of the two positioning strips and provided with slopes which are concave inwards from top to bottom, and the gasket is provided with a plurality of front fixing notches, rear fixing notches and positioning grooves. The front fixing notch and the rear fixing notch are each provided with a slope protruding outwards from top to bottom, and a limiting strip is arranged in the positioning groove. The problems that when the gasket is placed in the tibia support, the gasket is limited by the size of the joint space, installation is difficult, meanwhile, the sight line of an operator is blocked, and the gasket and the tibia support are difficult to coincide are solved.

The knee prosthesis moves between an extended position and a flexion position. The prosthesis includes a femoral component configured to be mounted to a femur, the femoral component having a femoral gear including a plurality of posts arranged along a helical trajectory. The prosthesis also includes a tibial component configured to (i) directly or indirectly mount to the tibia and (ii) engage the femoral component. The tibial component has a tibial gear that includes a plurality of recesses configured to engage with a post of the femoral gear. The tibial gear has two intersecting portions including a horizontally oriented curved portion and a vertical portion, where each portion includes at least one of the recesses. When the knee prosthesis is moved to an extended position, the plurality of posts follow a helical trajectory to cause movement of the tibial component in a medial or lateral direction.

The invention discloses an additive-manufactured biological tibia tray prosthesis and a manufacturing method thereof, and relates to the technical field of artificial knee joint prostheses. The biological type tibia support prosthesis comprises four types: a biological type symmetrical tibia support, a biological type symmetrical stemless tibia support, a biological type anatomical tibia support and a biological type anatomical stemless tibia support. The prosthesis mainly comprises a support body, a porous structure, a plug pin and the like, and is integrally formed through an additive manufacturing technology, so that the precision and the strength are ensured. The porous structure is designed to be in an irregular space three-dimensional grid shape, the thickness ranges from 0.6 mm to 1.6 mm, and the porous structure is used for promoting bone trabecula ingrowth and achieving biological fixation. The positioning nail adopts a bullet-shaped design and is provided with an exhaust groove and a notch, so that the installation is simplified and the stability is enhanced. The manufacturing method comprises the steps of design modeling, stress optimization, additive manufacturing and aftertreatment, and the prosthesis is made of a titanium alloy material and meets related international standards. The invention has the advantages of simple installation, reliable fixation, good bone ingrowth effect and the like.

An artificial knee joint includes: a femoral component including a medial condyle and a lateral condyle; and a tibial component including an inner sliding surface that receives the medial condyle and an outer sliding surface that receives the lateral condyle. A curvature radius of each of the inner sliding surface and the outer sliding surface in a medial-lateral direction increases from an anterior side toward a posterior side within a predetermined range in an anterior-posterior direction. In the medial-lateral direction, the inner sliding surface and the outer sliding surface are positioned inward such that a middle point between a lowest point of the medial condyle and a lowest point of the lateral condyle in a knee extended position is shifted inward relative to a center of the tibial component by 2 to 10% of a width of the tibial component.

A device for preparing the proximal surface of the tibia and / or the proximal surface of the distal femur and the posterior femoral condyle for the tibial component and / or femoral component of an artificial knee joint. The device includes an electronic system device that receives or measures data information, and the electronic system can use this information to communicate the control of the blade and / or cutting tool to resect the proximal surface of the tibia and / or the distal femur and / or the posterior femoral condyle to a desired reference plane cut, which can provide balanced angular movement between the femoral component and the tibial component of the artificial knee joint throughout the entire arc of extension, mid-flexion and flexion.

The present invention discloses a cushion prosthesis and an artificial knee joint prosthesis having the same. The cushion prosthesis includes a body, a convex portion and a buckle. The body has a first surface, and the first surface includes a front edge, a curved edge, a rear edge and a straight edge that are sequentially connected; the convex portion is provided on the first surface of the body; the buckle is provided on the first surface of the body, and the buckle extends along a second direction, and the included angle between the second direction and the first direction is an acute angle; The cushion prosthesis according to the embodiment of the present invention has the advantages of strong clamping force, not easy to cause deformation, and not easy to fall off from the tibial tray platform.

A prosthetic limb includes: a socket as a thigh part; a thigh joint part provided on a side of the socket; a lower leg part coupled to the thigh joint part and provided to be rotatable around a knee shaft; a thigh part inclination angle acquisition unit that acquires an inclination angle Ψ formed by the socket relative to a vertical line passing through the knee shaft; and a rotational resistance control unit that weakens a rotational resistance of the knee shaft in accordance with a transition from a positive inclination angle formed when the socket is inclined rearward relative to the vertical line to a negative inclination angle formed when the socket is inclined forward relative to the vertical line.

A method of providing an artificial knee or hip joint surface using a mould, wherein the method comprises the steps of placing the mould inside of the joint, injecting the mould with a fluid adapted to cure, curing the fluid inside of the joint, affecting the mould by the fluid injected into the mould, and resorbing the mould by means of the human body or by melting the mold with the injected material, and subsequently cure the fluid and serve as artificial joint surface.

An artificial knee joint 1 includes: an insert member 2 embedded in a part of a joint surface of a medial condyle MC or lateral condyle LC of a tibia T; and a bridge member 3 disposed underneath the insert member 2, and having a length that allows both ends thereof to be anchored to a cortical bone of a tibia T.

The utility model discloses an artificial knee joint prosthesis tibia support detection fixing device which can perform positioning without damaging a tibia support forge piece, can keep a wing plate parallel to the ground and is high in detection accuracy. The tool comprises a bottom plate, a limiting block is installed on the surface of the bottom plate, a profiling supporting block is arranged in the limiting block, the profiling supporting block comprises a positioning block, a limiting wall and a limiting groove, and the tool is characterized in that the limiting groove limits and fixes the supporting bottom of the tibia supporting forge piece, a positioning face is arranged on the top of the positioning block and is in a V shape, and a tibia rod of the tibia supporting forge piece can be directly embedded in the positioning face. The positioning face comprises a left supporting face and a right supporting face, the left supporting face and the right supporting face both make contact with and support wing plates of the tibia support forge piece, the right supporting face supports the wing plates on one side of the tibia support forge piece to keep stable, and the left supporting face enables the wing plates on the other side of the tibia support forge piece to be parallel to the bottom plate all the time.

The invention relates to a method for controlling an artificial knee joint comprising: an upper part (10) and a lower part (20) which are articulatedly mounted on one another so as to be pivotable about a pivot axis (15); and an actuator (30) which is coupled to the upper part (10) and the lower part (20) and influences a movement state of the upper part (10) and / or the lower part (20), wherein the actuator (30) is coupled to a control device (40) which is coupled to at least one sensor (50) and activates, deactivates, or modulates the actuator (30) on the basis of sensor values from the at least one sensor (50), wherein, when walking on a downwardly inclined surface, a stance phase flexion following an initial contact is countered with a resistance, and a stance phase extension is supported by the actuator (30) depending on the surface inclination (α).

An apparatus, system, and method for formulating a surgical plan for each patient are disclosed. One exemplary method (1202) includes identifying anatomical parameters of a knee joint (402), determining target kinematics of the knee joint based on the pre-implant anatomical structure (404), determining, for each of a first set of implant alignment options, one or more predicted gaps between a femoral prosthesis (102) and a tibial prosthesis (104) when implanted in the knee joint (1204), determining a second set of implant alignment options from the first set based at least in part on the predicted gaps (1206), determining the predicted kinematics for each implant alignment of the second set (406), identifying at least one recommended implant alignment of the femoral prosthesis (102) and the tibial prosthesis (104) based on the target kinematics and the predicted kinematics (408), and incorporating the at least one recommended implant alignment into a patient-specific surgical plan (800) (410).

The application discloses a control method of an active and passive hybrid driving intelligent artificial knee joint, and relates to the field of rehabilitation robots.The method comprises a mode recognition module and a control module.The mode recognition module is used for recognizing the gait phase of a wearer and the terrain information in front of the wearer, and provides decision data for the control module, and is characterized in that the mode recognition module comprises gait detection and terrain detection.The control module selects a corresponding control mode according to the decision data of the mode recognition module and feeds back the current sensing state, and the control mode comprises a passive mode and an active mode.The gait detection and terrain detection algorithms are used to recognize the gait phase of the wearer and the terrain in front of the wearer, different terrains are distinguished, and the active and passive modes are accurately switched, so that the control efficiency of the artificial knee joint is improved, and the energy consumption is reduced.

The application provides an adaptive variable instantaneous center artificial knee joint, which comprises a pneumatic muscle driving assembly (10) and a knee joint assembly (20). The knee joint assembly (20) comprises a thigh (21), a shank (22), a first connecting rod mechanism (23), an adjusting rod (24), a second connecting rod mechanism (25) and a rotating rod (26). The two sides of the thigh (21) and the shank (22) are connected through the rotating rod (26), the first connecting rod mechanism (23) is arranged between the thighs (21), the second connecting rod mechanism (25) is arranged between the shanks (22), and the first connecting rod mechanism (23) and the second connecting rod mechanism (25) are connected through a central shaft (200). The artificial knee joint can solve the problem of poor coordination between the existing artificial knee joint and the human leg. Meanwhile, the artificial knee joint can meet the needs of most users and adapt to the instantaneous center rotation track of different human knee joints, and has a wide application range.

To provide a constrained prosthetic knee.SOLUTION: In a prosthesis assembly, a hinge post can extend through a tibial bearing component and be at least partially received in a recess of a tibial tray. A femoral component can contact an articular surface of the tibial bearing component. A shackle can be coupled to the hinge post and configured to be inserted between a medial condyle and a lateral condyle of the femoral component. Walls can be positioned between the femoral component and the shackle. A hinge axle can be configured to secure the femoral component to the shackle. A bump stop can be removably attached to the femoral component and configured to contact the shackle at a set limit of rotation of the femoral component relative to the tibial bearing component.SELECTED DRAWING: Figure 3

The present invention relates to a cross-replacement artificial knee. A knee prosthesis is capable of moving between an extended position and a flexed position. The knee prosthesis includes: a femoral component configured to be mounted to a femur; a tibial component configured to be mounted to a tibia; a column fixedly connected to one of the femoral component and the tibial component; and a contoured recess defined on the other of the femoral component and the tibial component, the contoured recess configured to be engaged by the column in an extended position or a flexed position of the knee prosthesis. The knee prosthesis may also include an artificial ligament extending between the femoral component and the tibial component. The column and the ligament mimic one of the ACL and the PCL.