108 results about "Femur" patented technology

A bone fixator as disclosed herein includes at least one removable portion, and is particularly suitable for external fixation of the bones of the femur and tibia (knee joint), the tibia to the foot (ankle joint), the lower leg, the lower thigh, or the forearm and hand. Embodiments allow multiaxial, multiplanar movement, as well as procurvatum and recurvatum, on the anatomy to achieve optimal placement. Embodiments of the fixator includes four fixator joints, each of which is articulating with multiple degrees of freedom. Some fixator joint(s) include a linkage bar connectable to a multi-pin clamp having a quick connect mechanism. The multi-pin clamp is configured for fixation to a bone. Other fixator joint(s) may be connected to the multi-pin clamp in a semi-permanent or non-detachable manner. A telescoping rod assembly allows adjustment of the length of the fixator by a single individual.

The invention discloses an anterior cruciate ligament dead center positioning method based on three-dimensional geometric processing, and the method comprises the steps: obtaining a knee joint CT image of a knee joint of a human body and an anterior cruciate ligament related skeleton, and obtaining a three-dimensional mesh model of a femur and a tibia after preprocessing; traversing all three-dimensional vertex coordinates of the femur three-dimensional mesh model, generating contour lines from the bottom to the top, and selecting a contour line with the maximum perimeter as a feature contour line; after the feature contour line is projected, an extrusion model is obtained in a linear extrusion treatment mode, and the top face and the bottom face of the extrusion model are filled to obtain a complete closed extrusion model; obtaining a shaft alignment bounding box of the extrusion model so as to obtain a sphere model used for cutting, and obtaining a dial plate model by using the cut communication partition so as to obtain a 1-o'clock characteristic line; two feature vertexes are positioned through two times of cutting; obtaining a final dead center coordinate of the thighbone three-dimensional mesh model; the feature contour line of the tibia three-dimensional mesh model is obtained by adopting the method, the mesh is drawn according to the proportion, and the dead center coordinates of the tibia three-dimensional mesh model are positioned by penetrating out of the platform.

An intraoperative surgical system for knee arthroplasty may be configured and / or reconfigurable to allow the surgical system to be inserted into different sized joint spaces during a surgical procedure. For example, the surgical system may include a sensor support body defining a platform, a force sensor, and a plurality of sensor covers each being configured to be detachably attached to the sensor support body. Each of the sensor covers can vary from each other in at least one characteristic. A selected one of the sensor covers can be placed over the platform, sandwiching the force sensor between the platform and sensor cover, to define a joint insertion block configured to be inserted into a tibiofemoral joint for measuring a force between a tibia and a femur defining the tibiofemoral joint.

To provide a spacer instrument allowing evaluating an extension gap and / or flexion gap between a femur and a tibia or the respective implants.SOLUTION: A spacer instrument 10 comprises: a spacer carrier device 16 with a first spacer component 18 having a first thickness T1 and a second spacer component 20 having a second thickness T2, the first thickness being different from the second thickness; and a rotative tibia component 28 rotatively attached to the spacer carrier device via a rotation mechanism 30. The rotative tibia component is movable between at least a first position and a second position. The first spacer component at the first position and the second spacer component at the second position are directly above the rotative tibia component, and the spacer components respectively can be temporarily positioned on the resected proximal portion 12 of a tibia 14 with or without the rotative tibia component.SELECTED DRAWING: Figure 1

A combination of a first assembly for guiding resection of a femur and tibia of a knee joint and a second assembly including femoral and tibial knee components. The combination of the first assembly and the second assembly provides optimal placement and positioning of the femoral and tibial knee components to achieve near-normal knee kinematics and tension. The preparation for and placement of the prosthetic knee components provides medial-pivoting kinematics mimicking that of the natural knee thereby promoting improved outcome for the patient.

The invention relates to a surgical device for performing a controlled resection of the neck of a femur during a hip replacement procedure. The surgical device comprises a template comprising an aperture dimensioned for receiving a femoral head of the femur, and a frame comprising a resection guide for indicating a resection plane on the femoral neck. The femoral neck has a femoral neck axis. The frame is slidably connected to the template for positioning of the resection guide along the femoral neck axis while the template is mounted on the femoral head.

An orthopaedic surgical instrument includes a 4-in-1 cutting block and a removable alignment guide. The alignment guide is configured to contact the posterior femoral condyles of a patient's femur so as to kinematically align the 4-in-1 cutting block. A number of shims are selectively installed on the alignment guide to account for any cartilage loss present on the patient's femur. A method of surgically preparing a patient's femur utilizing kinematic alignment is also disclosed.

The invention discloses an intelligent joint replacement revision operation system and method based on CBCT and optical navigation, and the system comprises an imaging device which is used for collecting the positive and lateral two-dimensional images of a femur region and an ankle joint region of an affected limb and the three-dimensional image of a knee joint region, and reconstructing the three-dimensional models of the femur and the tibia; the optical tracking equipment is used for acquiring poses of the first tracing equipment and the second tracing equipment in real time; the key point acquisition module is used for acquiring three-dimensional positions of a femoral head central point and an ankle joint central point in the positive and lateral two-dimensional image and acquiring femoral inner and outer upper condyle points and a tibia marrow cavity point in the three-dimensional model; the affected limb section extraction module is used for obtaining the far-end section, the anterior section and the posterior section of the femur in the knee joint area and the plateau section of the tibia in the knee joint area; and the planning execution module is used for determining the target pose of the new implant according to the corresponding section, and performing planning execution according to the target pose. According to the invention, the accuracy and safety of the joint replacement revision operation can be improved.

A method to facilitate a robotic total knee arthroplasty includes performing a plurality of femoral cuts on a femur, the performing the plurality of femoral cuts including performing a distal femoral cut of the plurality of femoral cuts, performing an anterior femoral cut of the plurality of femoral cuts, performing an anterior chamfer cut of the plurality of femoral cuts after the performing the distal femoral cut and the performing the anterior femoral cut, and performing a posterior femoral cut of the plurality of femoral cuts after performing all other femoral cuts of the plurality of femoral cuts. The method further includes performing at least one tibial cut on a tibia after the performing the plurality of femoral cuts on the femur.

The invention discloses a tibia unicompartmental prosthesis, a femur unicompartmental prosthesis and a knee joint unicompartmental prosthesis component, the tibia unicompartmental prosthesis comprises a first mounting surface, and the first mounting surface is used for being mounted to a tibia osteotomy surface; the first mounting surface is provided with a first bone cement area and a first porous area; the first bone cement area is used for being fixed to the front side of the tibia osteotomy surface, and a first bone cement groove is formed in the first bone cement area and used for containing bone cement; the first porous area is used for being fixed to the rear side of a tibia osteotomy surface, the first porous area is provided with a first porous structure, and pores for bone ingrowth are formed in the first porous structure. In the application, the front side of the corresponding unicompartmental prosthesis is fixed through the bone cement, and the rear side of the corresponding unicompartmental prosthesis is fixed through the porous structure, so that the mounting stability of the corresponding unicompartmental prosthesis can be improved.

Systems and methods receive pre-operative, volume data for a patient's pelvis and a femur. A three-dimensional (3D) model is generated of the patient's pelvis and femur. A hologram of the patient's native hip is generated from the 3D model. The patient's pelvis is registered relative to a pelvic coordinate system. The hologram is displayed and the patient is aligned with the hologram. The 3D coordinates of a selected point on the femur is determined relative to the pelvic coordinate system. Following implantation of prosthetic hip components, the hologram of the patient's native hip is displayed again and the patient is aligned with the hologram. The 3D coordinates of the selected point on the patient's femur are again determined. One or more changes to leg length, offset, or Anterior-Posterior (AP) position are determined based on the two 3D coordinates determined for the selected point. The one or more changes to leg length, offset, or Anterior-Posterior (AP) position are displayed

A proximal-femur intraosseous release device includes a release mechanism. A primary fixing mechanism is provided at one end of the release mechanism, the primary fixing mechanism includes a first shell, and a second shell, a first triangular block and a second triangular block are arranged inside the first shell; the second shell is screwed to the first shell through threads, a bottom of the second shell is rotatably connected with the first triangular block, the first triangular block is slidably connected with the first shell, a bottom surface of the first triangular block is an inclined surface, the second triangular block is located at a bottom of the first triangular block, a top surface of the second triangular block is an inclined surface, and a through hole matched with the second triangular block is formed in the first shell.

A method of positioning posterior resection guides in a three-dimensional coordinate system using robotic arms to perform partial knee arthroplasties comprises connecting a first tracking device for a surgical tracking system of the robotic arm to a femur, connecting a second tracking device for the surgical tracking system of the robotic arm to a tibia, manually positioning the tibia relative to the femur to a desired orientation to perform a posterior resection, manually determining a position for the posterior resection guide to perform the posterior resection, digitizing a reference point for the posterior resection guide in the three-dimensional coordinate system for a location of a feature of the posterior resection guide, moving the posterior resection guide to the location in the three-dimensional coordinate system with the robotic arm, and resecting a posterior portion of a condyle of the femur using the posterior resection guide to guide a cutting instrument.

An orthopedic instrument (10) for a knee arthroplasty, the instrument including: a base (12) having one or more paddles (36) configured to seat against and reference one or both of a medial condyle and a lateral condyle of a femur; a body (14) linked to the base for rotation relative thereto, wherein the body includes a recess and slot therein and a first indicia (24) along a first face of the body adjacent the slot; a post (20) received in the recess and moveable relative to the body, wherein the post has a second indicia (28) used with the first indicia to determine a posterior size of the femur; and an adjustment mechanism (18) having a third indicia (30) to indicate a rotation of the femur, wherein the adjustment mechanism is configured to rotate the body relative to the base to a desired orientation based upon the rotation of the femur.

A system for balancing a knee of a patient includes a force measurement device configured to measure forces between a femoral bone and a tibia bone as a force is applied to the knee and a computing system configured to determine a separation distance between a point or region associated with the femur and a point or region associated with tibia based on force information from the force measurement device. The force measurement device may include at least one paddle configured for placement between the femur and tibia and including at least one force sensing element for sensing forces associated with the femur or tibia. The computing system may be configured to normalize a measured force and identify the separation distance based on the normalized force, wherein the identified separation distance is substantially the same over a range of forces measured by the force measurement device.

A surgical instrument system for use in a total knee arthroplasty includes a reference block that is attachable to a femur. The reference block has a block front side and a block rear side lying opposite the block front side. At least one compensation element has an element rear side and, lying opposite along the proximal-distal axis, a contact face for contacting a lateral condyle and / or medial condyle. A connection system has at least one connection portion on the reference block. At least one complementary connection portion is disposed on the compensation element. The connection system is configured to releasably attach the compensation element on the block front side. The compensation element in the attached state does not completely cover the block front side. The connection system is configured so that the compensation element is attachable in different positions on the block front side by the connection system.

The invention provides a traction device for fitting a knee joint instantaneous center track, and relates to the technical field of orthopedic medical instruments, the traction device comprises a thighbone fixing ring, a tibia fixing ring, an instantaneous center fitting mechanism and an automatic traction mechanism, a plurality of first through holes are uniformly distributed in the thighbone fixing ring, and a plurality of first fastening nuts are arranged on the first through holes; a plurality of second through holes are uniformly distributed in the tibia fixing ring, and a plurality of second fastening nuts are arranged on the second through holes; a swinging connecting piece is arranged on the instantaneous center fitting mechanism, a sliding block is connected to the swinging connecting piece, the center of the sliding block fits the instantaneous center of the knee joint of the human body, and the sliding block is connected into the guide groove in a sliding mode; the automatic drafting mechanism comprises an electric push rod, the electric push rod is provided with a guide rod, the guide rod extends or shortens to adjust the drafting angle of the instantaneous center fitting mechanism, and then the buckling angle of the knee joint is adjusted. The device has the advantages that the drafting orthopedic precision is high, the drafting angle is automatically adjusted, and the instantaneous center of the knee joint is fitted.

The invention discloses a knee joint stress loading MR dynamic imaging support, and relates to the technical field of medical instruments.The knee joint stress loading MR dynamic imaging support comprises a base and a cushion table, supporting frames are arranged on the front side and the rear side of the top of the cushion table respectively, binding assemblies are arranged on the tops of the outer walls of the two supporting frames respectively, a lifting mechanism is arranged in a fixing box, and the lifting mechanism is connected with the cushion table. The middle side, close to the bottom of the fixing box, of the top of the base is fixedly connected with a positioning sleeve, the top of the transverse face of the L-shaped plate is provided with an inward and outward turning stress potential detection mechanism, and the lower side, close to the inward and outward turning stress potential detection mechanism, of the top of the base is fixedly connected with an arc-shaped guide plate. An electric telescopic rod in the ectropion and ectropion stress position detection mechanism carries out telescopic motion to drive the front end of a cushion table to slide along an arc-shaped guide plate, the state that a knee joint is pulled by external force is simulated, a supporting frame on the rear side is controlled by a lifting mechanism to move upwards, and relative displacement of a tibia and a femur under stress is detected; a method of identifying joint semi-dislocation or abnormal activity.

The invention relates to a knee joint endoprosthesis (1) having a femoral component (10) for anchoring to a distal end of a femur and a tibial component (30) for anchoring to a proximal end of a tibia, wherein the femoral component and the tibial component each have a surface (17, 37) that is porous and / or has elevations and depressions. The invention further relates to a surgical kit for knee joint replacement.

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.

A system for ligament balancing including a range-of-motion (ROM) tensor. The ROM tensor of the system includes a main body, first and second arms, a pin guide and a pin. The main body has an elongate guide. The first and second arms are rigidly attached to and extends laterally from the main body and configured to be placed over an uncut tibia and below an uncut femur. The pin guide is slidably coupled to the elongate guide and has a through-hole for receiving the pin. The ROM tensor is designed to pivot about the pin while the tibia moves through its range of motion while the femur preferably remains stationary. A navigation system monitors the position of the tibia and femur as the tibia moves and the gap information derived from the position monitoring is displayed on a display device.

The present invention is a four-degree-of-freedom knee joint rehabilitation parallel mechanism, comprising a static platform, a dynamic platform, a first RRRRR branch chain, a second RRRRR branch chain, a UPS branch chain, and an input servo motor; the second RRRRR branch chain and the first RRRRR branch chain are distributed on the left and right sides of the front ends of the static platform and the dynamic platform, and the second RRRRR branch chain and the first RRRRR branch chain are both provided with an input servo motor; two UPS branches are symmetrically distributed on the left and right sides of the rear ends of the static platform and the dynamic platform; the four branches jointly realize two rotational degrees of freedom and two translational degrees of freedom of the dynamic platform relative to the static platform, the two translational degrees of freedom being used to fit the movement of the knee tibia relative to the femur; the two rotational degrees of freedom being used to fit the rotation of the knee tibia relative to the femur around a rotation axis perpendicular to the human sagittal plane and the external rotation movement of the knee tibia relative to the femur. This mechanism can accurately fit the variable axis movement of the human knee joint, reduce the human-computer interaction force generated during rehabilitation training, and improve comfort.

The invention discloses a bionic knee joint testing device based on medical image personalized reconstruction, and belongs to the technical field of humanoid tests.The bionic knee joint testing device is provided with a bionic knee joint base body, the base body comprises a thighbone end connector, a middle rotating shaft, a base and a tibia end connector, and the middle rotating shaft comprises a horizontal rotating cylinder and a vertical rotating shaft which are perpendicular to each other; a horizontal rotating shaft is arranged in the horizontal rotating cylinder; a first bearing is arranged at the end of the horizontal rotating shaft and fixedly connected with the thighbone end connector, and a simulation cartilage is arranged at the lower end of the connecting position of the first bearing and the thighbone end connector. A through hole is formed in the middle of the base, and the vertical rotating shaft is arranged in the through hole; a simulation meniscus is arranged at the upper end of the base, and the upper surface of the simulation meniscus is in contact with the lower surface of the simulation cartilage; the lower portion of the base is connected with the tibia end connector. The bionic knee joint pressure measuring dummy disclosed by the invention can realize physiological coupling motion simulation of the knee of a human body.

The application discloses a kind of based on knee joint motion mechanism's bionic joint mechanism, belong to bionic mechanical technical field.The bionic joint mechanism includes two bars four cable tensioning support units symmetrically arranged on two sides, is set in two bars four cable tensioning support unit between femur contour movement subassembly, with the femur contour movement subassembly and two bars four cable tensioning support unit cooperation setting bilateral linkage mechanism and drum wheel curved surface cooperation mechanism.The application can simulate the motion characteristics in the process of knee joint flexion by setting femur contour movement subassembly, improve the bionics and motion coordination of mechanism;By two bars four cable tensioning support unit and bilateral linkage mechanism, the mechanism has support ability and adaptability in the process of movement, ensure the consistency of two sides movement.The mechanism has the advantages of compact structure, linkage reliable, motion coordination, and can be applied to bionic robot, exoskeleton device and other related bionic mechanical system.

A knee arthroplasty instrument may include a tensioning instrument and at least a first sensor. The tensioning instrument can optionally include a tibial component configured to engage the tibia and a femoral component configured to engage the femur. The femoral component can be movably coupled to the tibial component to place the knee joint in tension by separating the tibia and the femur. The first sensor can be coupled to the tensioning instrument and can be configured to collect first data regarding a torque of the tensioning instrument when separating the tibia and the femur.

The application belongs to the technical field of civil engineering damping structure, and particularly discloses a self-resetting bionic steel hinge assembled RC frame structure and an assembling method thereof, the RC frame structure comprising a prefabricated column layer, a prefabricated beam, a bionic column hinge, a bionic beam hinge and a prestressed rod group, the bionic column hinge comprising a thigh boot and a shank boot, and the bionic beam hinge comprising a thigh connecting piece and a shank connecting piece. The bionic column hinge and the bionic beam hinge are used as connecting nodes between column bodies and between beams and columns, the bionic column hinge and the bionic beam hinge can bear bending moment and have good rotating capacity according to the characteristics of a plastic hinge, the thigh connecting piece, the shank connecting piece and the second energy dissipation plate in the bionic beam hinge respectively imitate the femur, the tibia and the ligament of a knee joint, and play the roles of supporting body weight, absorbing impact, keeping balance and providing flexibility, the thigh boot and the shank boot of the bionic column hinge simulate the femur and the tibia of a knee joint, and form a rotating mechanism cooperating with the ligament simulated by the first energy dissipation plate to perform stretching, flexing, internal and external rotation and locking movements.

Systems and methods include stabilizing a leg and providing femoral distraction during a knee arthroplasty surgery. The disclosed systems include a leg holder to receive a foot of a patient and a femoral distractor received in the leg holder and disposed underneath a knee of the patient. The femoral distractor is actuated to increase or decrease in length to distract the femur such that a surgeon may cut to resection the femur without also simultaneously providing distraction of the femur.

The invention discloses a femur posterior condyle osteotomy positioning device which comprises a base, a first distraction piece, a second distraction piece and a positioning piece, the base comprises a supporting part and a platform part, and the supporting part is used for being connected to the top end of a soft tissue pressure measuring device. The first distraction piece comprises a first distraction part capable of supporting the posterior condyle of the femur, and the second distraction piece comprises a second distraction part capable of supporting the posterior condyle of the femur. The positioning piece comprises a main body part and a third pivot shaft, at least two first nail holes are formed in the main body part, and the main body part is connected with the platform part through the third pivot shaft. The first distraction piece and the second distraction piece can independently support the inner side and the outer side of the thighbone posterior condyle, a user can conveniently adjust the height of the inner side and the outer side of the thighbone posterior condyle so that soft tissue tension of the inner side and the outer side of the knee joint can be balanced, the soft tissue does not need to be loosened in the positioning process, and the positioning accuracy is improved. The original mechanical property of the soft tissue can be kept.

A fixation assembly for quick-connect adjustable attachment of a prosthetic leg to an external ring fixator for immediate post-amputee ambulation. The device is configured for use with an existing external fixation assembly attached to a femur or tibia, and an existing prosthetic leg and foot combination of choice. The assembly generally includes an articulating fixator adjustably-attached to a monolithic support block by locking-ball-joint struts, and quick-connect pins insertable through the fixator and into receptacles on the locking-ball-joint struts for releasable attachment. The monolithic support block is a unitary block configured as a mounting base for mounting the prosthetic leg / foot support to its underside, and upwardly configured for weight-bearing attachment of the locking-ball-joint struts. The quick-connect pins allow releasable mounting to the existing external ring fixator.

The application discloses a child tibia tumor type rotary hinge knee joint prosthesis and belongs to the medical instrument field, which comprises: a femur end prosthesis, a tibia pad and a bionic joint connecting piece. The femur end prosthesis comprises a positioning plate body, the positioning plate body is provided with a connecting part and a butt joint rod, the tibia pad is detachably connected with the positioning plate body and is provided with a concave arc joint surface, the bionic joint connecting piece is provided with a butt joint hole and a rotating pin, the butt joint hole is movably connected with the butt joint rod through a ligament bionic mechanism, the bionic joint connecting piece is allowed to rotate around the butt joint rod and is allowed to reciprocate along the axis of the butt joint rod within a set distance range, and the ligament bionic mechanism generates an elastic restoring force when the bionic joint connecting piece and the butt joint rod relatively displace, the tibia end prosthesis is provided with a connecting hole and is rotatably connected with the rotating pin through the connecting hole, and the tibia end prosthesis is further provided with a convex arc joint surface. Through the above arrangement, the tibia end prosthesis is allowed to rotate around the butt joint rod and the rotating pin respectively, so that the internal and external rotation actions and the flexion action of the lower leg are realized.