36 results about "Unicompartmental knee replacement" patented technology

A method of minimally invasive unicompartmental knee replacement includes accessing a knee through a minimal incision, forming a planar surface along a tibial plateau of the knee, forming a planar posterior surface along a posterior aspect of the corresponding femoral condyle, resurfacing a distal aspect of the femoral condyle to form a resurfaced area having a curved portion, implanting a prosthetic tibial component on the planar surface along the tibial plateau and implanting a prosthetic femoral component on the prepared surface of the femoral condyle formed by the planar posterior surface and the resurfaced area. The curved portion of the resurfaced area has an anterior-posterior curvature corresponding to a fixation surface of the prosthetic femoral component. Prior to implantation, the femur and tibia are prepared to receive fixation structure of the femoral and tibial components.

The present invention provides, in certain embodiments, a device for positioning and orienting the femoral cutting block. The present invention also provides a device for setting rotation of sagittal resection for unicompartmental knee arthroplasty. The present invention further provides methods for setting the rotation of the tibial implant by kinematic measurements.

A bone surgery device with a reciprocating cutting head. The device comprises several sets of shaping surfaces sometimes including cutting blades, which are located and oriented so as to shape the distal end of the femur and the proximal end of the tibia for total knee replacements and unicompartmental knee replacements. The device, which may be hand directed or aided by spatial and directional guiding mechanisms or an optical navigation system, may also include both coolant supply for controlling heat during bone cutting and shaping, and a suction method for carrying away fluid and debris. The device is substantially configured to the artificial joint component to be attached thereto.

A femoral extension prosthetic component for use in a unicondylar meniscal bearing unicompartmental knee replacement is described. The femoral component comprises a securing element and a bearing surface, the securing element adapted to abut and be connected to a distal end of a femur bone, and the bearing surface adapted to abut a meniscal bearing. The femoral component includes an entrapment portion adapted to extend beyond the meniscal bearing. Tibial components and meniscal bearings are also described, as well as methods of using such components.

The invention relates to a tibia osteotomy guider, which belongs to the technical field of orthopedic medical instruments and comprises an osteotomy guide part, a driving component for driving the osteotomy guide part to move and a retroversion adjusting component for adjusting a tibia retroversion angle. The osteotomy guiding piece comprises an arc-shaped plate and a fixing plate, and the arc-shaped plate and the fixing plate are perpendicularly arranged and fixedly connected. The arc-shaped plate is provided with a transverse osteotomy guide groove extending in the length direction of the arc-shaped plate, and the transverse osteotomy guide groove penetrates through the two sides of the arc-shaped plate. A longitudinal osteotomy guide groove is formed in the fixing plate and penetrates through the two sides of the fixing plate. The tibia osteotomy guider has the effects of quickly adjusting the osteotomy position and accurately adjusting the retroverted angle during knee joint unicompartmental knee arthroplasty and facilitating a doctor to quickly and accurately cut off a tibia lesion part, the success rate of an operation is increased, the pain of a patient is reduced, and the satisfaction degree of the patient is guaranteed.

The invention provides a method for positioning longitudinal osteotomy position of tibia in unicompartmental knee arthroplasty, an intramedullary positioning rod and a thighbone drilling guide auxiliary device are used for determining the drilling position of a fixing hole used for mounting a thighbone prosthesis on the thighbone, the fixing hole is prepared under the guiding effect of the thighbone drilling guide auxiliary device, the postartis of the thighbone is cut off, the meniscus is cut off, a thighbone test mold with the appropriate thickness of the distal condyle is selected and installed after bone surface primary forming, the knee joint is bent and stretched repeatedly, and the longitudinal osteotomy position of the tibia is determined through the thighbone test mold. By capturing the motion trail of the tibia joint during relative normal motion, reference is provided for longitudinal osteotomy of the tibia platform, so that the longitudinal osteotomy position of the tibia is determined, the rotation alignment of the tibia prosthesis is closer to the motion trail of the tibia joint, collision between the prostheses is avoided, the motion compatibility and coincidence of the thighbone and tibia prostheses are better, the postartis of the thighbone is preferentially cut off, so that the meniscus on the tibial plateau is cut off more easily, and the collateral ligament is prevented from being damaged.

The invention belongs to the field of medical instruments and discloses a unicompartmental knee prothesis, comprising a femoral condyle, a flat carrier and a flat pad arranged between the femoral condyle and the flat pad; the femoral condyle includes a first arc face matching with the flat pad and a second arc face opposite the first arc face; first and second fixing posts on a center line of thesecond arc face are formed on the second arc face; when the femoral condyle is in the initial state, the axis of the first fixing post is perpendicular to the horizontal plane, the axis of the secondfixing post and the axis of the first fixing post form an included angle. The unicompartmental knee prothesis can be fixed better to the human bone tissues, thereby effectively improving the stabilityof the unicompartmental knee prothesis in the human body after unicompartmental knee arthroplasty, and further effectively ensuring normal kinematic characteristics of the knee.

The invention relates to a femoral condyle measuring device used for unicompartmental knee arthroplasty. The femoral condyle measuring device is matched with a guider of the unicompartmental knee arthroplasty for use; the femoral condyle measuring device comprises a positioning part and a measuring part; the positioning part is connected with the measuring part in a detachable manner. The femoral condyle measuring device used for the unicompartmental knee arthroplasty can be directly used for intraoperative measurement; compared with traditional preoperative photograph indirect measurement, the intraoperative measurement is not affected by the quality of the photographs and other factors, so that the measurement is more precise; moreover, according to the requirement of operations, different measuring parts can be arranged corresponding to different radiuses of prostheses; the measuring part is directly inserted in the femoral condyle, so that the operation is simple and convenient.

The invention relates to a method for positioning a prosthesis rotation angle safety area in unicompartmental knee arthroplasty. The method is characterized by comprising the following steps of, 1) acquiring a personalized kinematics range of a knee joint of a patient before an operation or personalized kinematics data of the knee joint simulated in the operation of the patient; 2) performing three-dimensional dynamic preoperative planning based on the acquired personalized kinematics range of the knee joint of the patient to obtain a personalized tibial plateau prosthesis rotation safety areaof the patient; and 3) making a preoperative plan report, operative navigation, a patient-specific 3D printing operation tool and a robot-assisted operation scheme based on the personalized tibial plateau prosthesis rotation safety area of the patient obtained in the step 2). According to the method, tibial plateau prosthesis rotating direction safety range adapting to the personalized movement requirements of the patient is established on the basis of the knee joint kinematics data of different personalized postures and functions of the patient, the kinematics and dynamics requirements of the patient can be met, and therefore the method can be widely applied to the field of unicompartmental knee arthroplasty research.

The invention discloses a design method of a guide plate for unicompartmental knee arthroplasty and related equipment. The method comprises the following steps: acquiring a medical image of a target part; determining a three-dimensional image of the target part based on the medical image; determining a unicompartmental prosthesis model in a prestored prosthesis database based on the three-dimensional image; generating a guide plate model matched with the unicompartmental prosthesis model, and obtaining guide plate design data for processing and manufacturing the guide plate for unicompartmental arthroplasty. The guide plate design efficiency can be improved.

The invention relates to a method and system for measuring a force line track of distal femur relative to a prosthetic pad in unicompartmental knee arthroplasty, wherein a hardware system mainly comprises an array pressure sensor, a data transmission and interface circuit, a radio frequency transceiver and a PC. The track measurement algorithm mainly adopts two times of least square fitting, and the first time of least square fitting is used for obtaining pressure distribution data and a maximum pressure point coordinate. The maximum pressure point is taken as a touch point. The second times of least square fitting is adopted to obtain a final force line track. According to the method, the motion track of the femoral prosthesis relative to the prosthesis pad can be acquired in real time, the obtained track is compared with a standard track, and the femoral prosthesis, the prosthesis pad and the tibial prosthesis are installed by taking the obtained track as a reference, so that an installation position and an installation angle are determined.

The invention relates to the technical field of unicompartmental knee arthroplasty, in particular to an osteotomy guide device for unicompartmental knee arthroplasty and aims to solve the problem thatexisting osteotomy guide devices cannot realize different osteotomy angles to meet different osteotomy requirements. Thus, the osteotomy guide device comprises a positioning part and a guiding part which are connected in a pivoted manner, the positioning part can be matched with a tibial plateau on one side so that the pivot axis is parallel or coplanar with the tibial plateau on one side, an osteotomy groove extending in the direction of the pivot axis is formed in the guiding part, fixing parts for fixing the positioning part and the guiding part to tibia are arranged at the positioning part and the guiding part, and the osteotomy guide device also comprises an angle indicating component for indicating the size of the included angle between the central plane of the osteotomy groove andthe tibial plateau on one side. By the arrangement, an operator can adjust the included angle between the guiding part and the positioning part, so that the central plane of the osteotomy groove is parallel or forms a certain included angle with the tibial plateau on a non-osteotomy side.

The invention relates to a robot for bone joint replacement surgery. According to the robot, CT three-dimensional reconstruction, conversion of a three-dimensional model and an actual coordinate system, intraoperative visual servo and a path specification method based on an artificial potential field method are fused into a bone joint surgical robot. According to the invention, a surgical robot which can be used for shoulder joint replacement, hip joint replacement, knee joint replacement or unicompartmental knee replacement is newly provided; compared with an existing bone joint surgical robot, the functions are more comprehensive, the positioning and navigation planning speed is higher, and the accuracy is higher; an augmented reality technology based on three-dimensional visualization and feature point matching is adopted to realize three-dimensional reconstruction of the CT image of the preoperative patient; a six-dimensional force sensor is installed on the wrist of the robot, the contact force measured in real time is used for collision detection and intraoperative safety detection when the mechanical arm searches for the operation position, and the safety of the robot operation is guaranteed in combination with an emergency stop measure; and the invention mainly aims to provide a bone joint replacement surgical robot with a function of completing hip joint and knee joint orthopedic surgery.

The invention discloses a bone-cutting aiming instrument. The bone-cutting aiming instrument comprises a handle, a knife pouch, an adjusting part and a fixed shaft, the fixed shaft is arranged on thehandle, a first through hole is formed in the axis of the handle, and the knife pouch penetrates through the first through hole and is in cooperative connection with the adjusting part. The inventionfurther discloses a using method of the bone-cutting aiming instrument. The aim is to research influences of the bone-cutting aiming instrument on knee joint inner side unicompartmental knee arthroplasty, and therefore the effective method which is used for reducing malposition and related complications of tibia prostheses in the unicompartmental knee arthroplasty is studied. With the bone-cuttingaiming instrument, perpendicular bone cutting of the inner side tibial plateau can be made to be simpler and more accurate, repeatability is high, especially for beginners just developing the arthroplasty, a learning curve can be shortened, the arthroplasty is easily further popularized, rehabilitation can be accelerated for a patient, time in a hospital can be shortened, and the hospitalizationexpenses can be reduced for the patient.

The invention relates to the field of medical instrument design, in particular to a fixed unicompartmental prosthesis with different sagittal plane forms, the sagittal plane forms comprise a straight plane with the curvature radius being REF, a buckling plane with the curvature radius being RFF and a rear angle plane with the curvature radius being RPHF, the REF is larger than the RPHF, the straight plane is tangent to the buckling plane, the buckling plane is tangent to the rear angle plane, and the RPHF is larger than the REF. A transition arc section ALEF from the farthest point of the curvature radius of the unbent surface to the tangent point of the unbent surface and the buckling surface and a transition arc section ALFF from the tangent point of the unbent surface and the buckling surface to the last point of the buckling surface are arranged, and different sagittal plane forms are achieved when the fixed unicondylar prosthesis is used for replacing the thighbone inner side compartment or the thighbone outer side compartment. The product provided by the invention enables the sagittal plane of the femoral condyle prosthesis to be more adaptive to the physiological knee joint shape, avoids the instability of the semi-flexion position of the knee joint, and realizes the accurate ligament tension balance in the whole course of the knee joint movement after the unicompartmental knee arthroplasty, thereby reducing the postoperative complications.

The invention provides a tibial prothesis anti-shift fixator for unicompartmental knee arthroplasty and belongs to the technical field of surgical assist equipment. The tibial prothesis anti-shift fixator for unicompartmental knee arthroplasty comprises a fixing portion, a connection portion and a handheld portion; the fixing portion is connected with the handheld portion via the connection portion; the fixing portion includes an upper fixing portion and a lower fixing portion; the upper fixing portion is a metal rod in flat square shape; a soft pad is arranged at the inner side of the surfaceof the front of the metal rod; the lower fixing portion is a pin that may be inserted into a reserved marrow channel; the connection portion includes two connection rods that are intersected and rotationally connected; the rear end of one connection rod is fixedly connected with the front end of one shank, and the front end of the connection rod is fixedly connected with the rear end of the metalrod; the rear end of the other connection rod is fixedly connected with the front end of the other shank, and the front end of the connection rod is fixedly connected with the rear end of the pin. The tibial prothesis anti-shift fixator for unicompartmental knee arthroplasty helps provide firm fixation for a tibial prothesis and is simple to perform, drilling bone is not required as the originalmarrow channel is used, and the design of the soft pad at the prothesis contact face helps protect the prothesis and prevent iatrogenic abrasions.