111results about "Knee joints" patented technology

A system for computer assisted navigation during surgery. At least one processor operates to identify locations of fiducials of a reference element on a ball tip stylus in images obtained from tracking cameras with at least partially overlapping field-of-views imaging the ball tip stylus with a ball palpating a surface of a bone. Operations determine locations of a center of the ball based on the locations of the fiducials of the reference element, and define an offset-acquired surface of the bone based on mathematically connecting the locations of the center of the ball. Operations determine local normal vectors to the offset-acquired surface for the locations of the center of the ball. Operations translate the offset-acquired surface of the bone toward the surface of the bone along the local normal vectors based on a radius of the ball to define an acquired surface of the bone.

The described system designed to promote the biological attachment of fibrous connective tissue to a bone implant features a bone implant with a scaffold defining a porous attachment surface, a suction port, and a manifold that distributes a negative pressure gradient across the attachment surface. The system also includes an extracorporeal vacuum pump and a percutaneous suction hose connecting the suction port of the implant to the vacuum pump. The implant is placed in the patient's body with connective tissue applied over the attachment surface, and the suction hose is attached and connected to the vacuum pump. The vacuum pump, operating outside the body, creates a negative pressure gradient over an extended period, promoting the growth of slow growing Sharpey's fibres for superior biological integration. A highly vascularised tissue graft, such as a pedicled muscle flap, may be applied adjacent to the avascular tendon to enhance endogenous growth factor migration.

A sacroiliac joint implant is formed from a web structure having a space truss with two or more planar truss units having a plurality of struts joined at nodes. The web structure is configured for fusion of a sacroiliac joint.

A tibial component of a prosthetic knee implant comprises an implant tray, medial and lateral articular pads, first and second pivot bearings, and first and second cushion members. The implant tray includes medial and lateral sockets. The medial articular pad is supported within the medial socket by the first pivot bearing which engages the socket's bottom surface and the first cushion member which is sandwiched between the first pivot bearing and the medial articular pad. The lateral articular pad is supported within the lateral socket by the second pivot bearing which engages the socket's bottom surface and the second cushion member which is sandwiched between the second pivot bearing and the lateral articular pad. The pivot bearings pivot, roll, and slide against the socket bottom surfaces whereby the articular pads can pivot and rotate within the sockets. The cushion members absorb forces and impacts experienced by the articular pads.

According to one example, a bearing component for a knee arthroplasty is disclosed. The bearing component can optionally comprise any one or combination of: a medial compartment having an medial articular surface with a medial articular track and having a first thickness as measured at the medial articular track between the medial articular surface a medial distal surface; and a lateral compartment having a lateral articular surface with a lateral articular track and having a second thickness as measured at the lateral articular track between the lateral articular surface a lateral distal surface; wherein the medial articular surface at the medial articular track and the lateral articular surface at the lateral articular track each have an inclination so as to form an acute angle with respect to a resected proximal surface of a tibia.

The described system, designed to promote the biological attachment of fibrous connective tissue to a bone implant, features a bone implant having a scaffold defining a porous attachment surface, a suction port, and a manifold distributing a negative pressure gradient across the entire attachment surface. The system also includes an external vacuum pump and a percutaneous suction hose connecting the implant's suction port to the vacuum pump. The implant is placed inside the patient's body with the connective tissue grafted to the attachment surface, the suction hose is attached, and it is connected to the vacuum pump. The vacuum pump, operating outside the body, creates a negative pressure gradient over an extended period, promoting the growth of Sharpey's fibers, which grow slowly for optimal biological integration. To promote endogenous growth factor transport, highly vascularized tissue grafts, such as pedicled muscle flaps, may be grafted adjacent to avascular tendons.

An implant type or a process of implant fixation is automatically identified by processing surgical plan information. Further, bone mineral density information associated with a patient is determined by processing at least one image. The determined bone mineral density information and patient information representing at least demographics associated with the patient are processed, and a selection of a plurality of patients that previously underwent arthroplasty is made. Outcome information representing results of arthroplasty procedures is processed and a threshold is established representing a biomechanical tolerance. The bone mineral density information is processed to be determined associated with the patient is determined to be above or below the threshold.

The present invention relates to a total knee prosthesis made of solid ceramic comprising a femoral element (1), a tibial plateau (3), and a movable plateau (2) forming two joints, as well as a pin (5) for stabilising the movable plateau thereof, for limiting post-surgery movements before natural fibrous tissue has formed, and for ensuring optimum clearance between the different ceramic surfaces. The prosthesis also has: • - mutual friction surfaces that are entirely made of the same ceramic material and two condylar cups (21) on the upper portion of the movable plateau; and • - two condyles (11) on the femoral element that each comprise mutual friction surfaces between which there is a clearance of less than 100 μm when the longitudinal axes of the femoral element and of the tibial plateau form an angle a of between 0° and 75°.

A method for planning a surgery to a knee joint includes recording a target HKA for a patient and, based on an evaluation of wear of the knee joint, setting an initial resection plan including setting planned femoral resections and setting at least one planned tibial resection. The method includes determining a planned HKA of the patient based on the initial resection plan. The planned HKA is a function of a femoral coronal alignment provided by the planned femoral resections and a tibial coronal alignment of the patient provided by the planned at least one tibial resection. The method further includes selectively adjusting the initial resection plan based on the target HKA and the planned HKA by adjusting the planned tibial coronal alignment and / or the planned femoral coronal alignment to provide an adjusted resection plan with an adjusted planned HKA that is within a threshold of the target HKA.

Embodiments of the present application provide a femoral condyle prosthesis and a femoral prosthesis with the femoral condyle prosthesis. The femoral condyle prosthesis comprises a femoral condyle, which comprises a medial condyle and a lateral condyle for corresponding cooperation with a tibia, the medial condyle and the lateral condyle are connected to each other to form an anterior condylar surface, and a middle of the anterior condylar surface is recessed to form a trochlear groove for accommodating a patella, a line connecting the lowest points of the trochlear groove is a prosthesis patella trajectory line, and the prosthesis patella trajectory line is located outside a midpoint of an intercondylar notch at a position near the lowest point of the trochlear groove of the femoral condyle. Therefore, the femoral condyle prosthesis of the embodiments of the present application can greatly reduce the problem of knee pain in the large flexion movement of the knee joint.

Disclosed are systems and methods for a computerized framework that provides novel mechanisms for determining the automatic placement of a reference grid and an anatomical reference frame (ARF) of a bone. The disclosed framework is operational for the enablement of computerized mechanisms that, based on a three-dimensional (3D) model of a distal femur, can determine, provide and / or display the anatomically correct positions of femoral tunnels and / or other forms of surgical landmarks surgeons rely on for anterior cruciate ligament (ACL) procedures. The disclosed framework is also operational for the enablement of computerized mechanisms that, based on a three-dimensional (3D) model of a proximal tibia, can determine, provide and / or display the anatomically correct positions of tibial tunnels and / or other forms of surgical landmarks surgeons rely on for ACL procedures.

A data processing method, data processing apparatus and method for assessing the posterior cruciate ligament length for a knee replacement procedure are described. The loaded displacement and unloaded displacement between a tibia and a femur in the anterior-posterior direction are measured at a plurality of knee angles. An estimate of the maximum length of the posterior cruciate ligament for the plurality of knee angles is made using the loaded displacement. A planned knee joint separation between the tibia and the femur is determined from planned tibial and femoral implant positions and said unloaded displacement. An estimate of the required length of the posterior cruciate ligament for the plurality of knee angles is determined from the planned knee joint separation. A comparison of the estimate of the required length of the posterior cruciate ligament and an estimate of the maximum length of the posterior cruciate ligament is output as a function of knee angle.

One aspect relates to a device for producing a spacer havinga stem mold which has an inner space, wherein the inner space is accessible via a proximal opening and wherein the stem mold has a proximal wall which peripherally delimits the proximal opening of the stem mold,a head mold which has in the interior thereof a hollow space, wherein the hollow space has a spherical surface-shaped inner surface and is accessible via a distal opening, wherein the head mold has a distal wall which peripherally delimits the distal opening of the head mold,a metal core which has a stem part, a head part and a flange, wherein the flange projects out from the metal core, is arranged between the stem part and the head part and has a proximal surface and a distal surface,wherein the stem mold and the stem part are shaped such that the stem part is arranged in the inner space, when the proximal wall is resting against the distal surface, and wherein the head mold and the head part are shaped such that the head part is arranged in the hollow space, when the distal wall is resting against the proximal surface.

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

A tibial prosthesis comprises a tibial pad, a platform holder and a pushing part. The upper part of the pad has a first fixing block connected with femoral condyle, the middle part has a first opening, and the periphery has three second openings with second fixing blocks. The first recess has a third opening, and the bottom has a fourth opening with a first limiting block with a fifth opening. The spring in the third opening pushes the second limiting block to be clamped in the fifth opening. The platform holder has a sixth opening and a second recess, the upper part has a seventh opening with a fourth limiting block that can be expanded, and the second recess has a fifth limiting block that is hinged. The pushing part is set in the lower part of the platform holder, which comprises a hexagonal screw and a fixing ring, the screw has a ninth opening, and the fixing ring is connected with the rotating part through a ratchet. When rotating, the rotating part pushes the first limiting block into the seventh opening, expands the fourth limiting block, and then shrinks the limiting block, while the second limiting block is clamped in the fifth opening to be fixed. The second fixing block is clamped in the ninth opening to connect the screw with the pad. When the rotating part enters the second recess, it pushes the fifth limiting block to be clamped in the recess, and the overall fixation is completed.

To provide knee arthroplasty trials, systems, and related methods.SOLUTION: A knee arthroplasty trial system may include an expandable tibial tray trial having top and bottom plates, an actuation screw retained in the bottom plate, and an expansion ramp configured to slide along the bottom plate and lift the top plate as the ramp translates forward. The actuation screw may define a helical cut with step portions, and the expansion ramp may include a pin configured to engage the helical cut of the actuation screw. When the actuation screw is rotated, the pin rides along the helical cut and is configured to rest within one of the step portions, thereby ensuring that the expandable tibial tray trial expands only to discrete thicknesses.SELECTED DRAWING: Figure 1

After the knee prosthesis using this tibial platform is implanted in the human body, a gap appears between the femoral condyle and the tibial pad due to long-term wear. The compressed elastic component begins to push the first push block to move, thereby lifting the first ascending part located on the upper inclined surface of the first push block. The first ascending part drives the tibial pad to rise. The first push block, pushed by the elastic component, pushes the second push block to move inward along the track. The second push block then pushes the support rod of the second ascending part to move, and the lifted second fixing block further drives the tibial pad to rise. After the tibial pad has been lifted, the pawl in the blocking device engages with the serrations on the second push block, thereby limiting the push block and preventing it from retracting, thus preventing the ascending part from descending, and completing the lifting of the tibial pad. This effectively solves the problem in the prior art where the gap between the femoral condyle and the pad is different after wear on the inner and outer sides of the femoral condyle, leading to accelerated wear.

An implant for use in a medical procedure includes an anchor body and a flexible material. The anchor body includes a perimeter sidewall having an upper free edge, an outer surface, and an inner surface. The anchor body also includes a bottom wall, connecting the sidewall on one edge, which has an inner surface and an outer surface. The inner surfaces of the sidewall and bottom wall define a cavity and the upper free edge of the sidewall defines a top opening into the cavity. The flexible material is connected to the anchor body and is positioned in the cavity with at least a portion extending out of the top opening.

Medical devices are provided, comprising a medical device and a sensor.

An orthopaedic surgical instrument system includes a sensor adapter and multiple surgical instruments. The sensor adapter includes a housing with a force sensor positioned within the housing and a sensor contact configured to transfer force to the force sensor extending from the housing. Each surgical instrument includes a sensor connector configured to receive the sensor adapter at a predetermined location relative to the surgical instrument. Each sensor adapter further includes a registering feature to engage an anatomical feature of a patient or another surgical instrument. The surgical instruments may include a shim that may be attached to a gap assessment tool or a tibial insert trial. Methods associated with the surgical instrument system are also disclosed.

The application provides a femoral prosthesis and a knee joint prosthesis with the same, wherein the femoral prosthesis comprises a femoral module and an intramedullary rod module, and the intramedullary rod module comprises: a first threaded rod provided with a first through hole penetrating in the axial direction, and an outer thread is arranged on the outer surface of the first threaded rod; a second threaded rod comprising an inner cylinder, an outer cylinder and a top cover, the inner cylinder is provided with a second through hole penetrating in the axial direction, the first threaded rod is arranged in the second through hole, the inner surface of the inner cylinder is provided with an inner thread matched with the outer thread, the outer cylinder is sleeved on the outer periphery of the inner cylinder, and the top cover is connected to the top end of the outer cylinder; and an anti-rotation assembly comprising a stop base and an inclined nail, the stop base is located in the installation space and is in a stop fit with the inner cylinder and / or the outer cylinder, and the inclined nail is installed on the stop base and can be outwardly extended from the top cover through the through hole. The technical scheme of the application can effectively solve the problem of insufficient stability of the femoral prosthesis after implantation in the related art.

An endoprosthesis intended to replace a resected portion of bone and joint. The endoprosthesis can be non-invasively, manually operated to lengthen a patient's limb both intraoperatively and postoperatively. It includes bone anchoring components for anchoring to a first and second long bone, a joint to replace the function of an orthopedic joint, and a purely mechanical lengthening mechanism which can be located and operated manually by an operator by pressing on skin of a patient without requiring a surgical incision. The axle for joint is the actuating mechanism that lengthens the implant. The endoprosthesis does not need or include any magnets, electric motors, electric current, application of heat or a fluid displacement (hydraulic) system.

Disclosed herein are implants with sensors and methods for powering implants with sensors. A joint implant according to the present disclosure can include a first implant and a second implant in contact with the first implant. The first implant can be coupled to a first bone of a joint. The first implant can include an energy generator coupled to a transducer. The second implant can include at least one sensor, a battery coupled to the at least one sensor, and a receiver coupled to the battery. The receiver can be disposed within the second implant adjacent the transducer. Energy from the energy generator can be transmitted from the transducer of the first implant to the receiver of the second implant.

System for evaluating the fit of a femoral implant (118A, 188B) to a distal end of a femur (32) in a selected orientation before the femur (32) is resected, the system comprising the following elements: - Means of obtaining predefined form factor information for a variety of femoral implants (118A, 188B); - Means of obtaining information about the shape of the surface of the distal end of the femur (32); - Means for automatically performing a virtual fit assessment of each possible incremental position of a predefined set of incremental positions for each size of an implant to be considered (118A, 188B) before the femur (32) is resected; and - Means for selecting an optimal size and position of an implant (118A, 188B) from the virtual fit assessments, characterized in that the means for selection - Means for calculating a maximum lateral runout of an anterior resection of the femur (32) from an outline (220) of a proximal end of the femoral implant, and / or - Means to calculate a percentage of the outline (220) of the proximal end lying on sectioned anterior cortical bone, and / or - Means of calculating a percentage of the outline (220) of the proximal end that lies on or above uncut anterior cortical bone, and / or - Contains means for calculating a maximum gap between the femoral implant and the uncut anterior cortical bone.

The application relates to the technical field of knee joint replacement prostheses, in particular to a low-wear knee joint replacement prosthesis preparation method.The technical scheme of the joint replacement prosthesis comprises a tibial pad, a femoral prosthesis, a tibial support and a neodymium magnet; the tibial pad, the femoral prosthesis and the tibial support are injection molded by adopting the same type of mold structure; the preparation steps of the replacement prosthesis are as follows: step one, preparing raw materials required for composing the prosthesis; step two, preparing the tibial pad, the femoral prosthesis and the tibial support by combining an injection mold, realizing the preparation of the neodymium magnet block by combining a smelting furnace, alloy smelting, mold forming, vacuum sintering and tempering treatment; and step three, assembling the replacement prosthesis.The application avoids the appearance of wear metals from the material, thereby avoiding the release of inflammatory mediators, ensuring the long-term stability of the replacement prosthesis, applying the same-pole repulsion principle between magnets, realizing the magnetic suspension state between the prosthesis structures, thereby avoiding contact wear and prolonging the service life of the prosthesis.