24 results about "Mechanical axis" patented technology

Provided are a biplanar image-based preoperative planning method and system for total knee arthroplasty. Based on a static biplanar lower-limb image of a knee joint of a target object in a standing position and a dynamic biplanar image of the knee joint during functional motion, as well as an imported three-dimensional model, functional parameters, morphological parameters, and a three-dimensional medial and lateral joint gap of the knee joint are calculated, and then iterative calculation is continuously carried out using a two-dimensional model and a three-dimensional dynamic model to obtain a dynamically optimized placement position, so that preoperative TKA prosthesis model selection for balanced joint space across full flexion angles can be achieved; meanwhile, TKA prosthesis position planning for correcting the mechanical axis of the knee joint under three-dimensional weight-bearing conditions is considered, thereby accurately restoring the real dynamic motion of a patient, and improving the prosthesis-patient matching degree.

The present invention discloses a fully automatic measurement method, system, terminal and medium for knee varus and valgus, relating to the technical field of image processing. The key points of its technical solution are as follows: obtaining three-dimensional lower limb bone data; after segmenting and reconstructing the lower limb bones based on the three-dimensional lower limb bone data, obtaining a three-dimensional lower limb bone network model, and extracting the surface data points of the lower limb bones; extracting key points including the center point of the femoral head, the center point of the knee joint, and the center point of the ankle joint surface from the surface data points of the lower limb bones, and determining the femoral mechanical axis and the tibial mechanical axis based on the key points; performing an inverse cosine solution on the dot product between the unit vector of the femoral mechanical axis and the unit vector of the tibial mechanical axis to calculate the HKA angle. Based on prior knowledge, the present invention directly extracts key points from the segmentation results of the lower limb bones. Its processing speed will not increase significantly with the increase in data volume, requires less computing power, takes less time, and has higher efficiency.

According to an aspect, a preoperative planning method for a high-tibial knee osteotomy procedure is provided. The method includes: a) constructing a 3D model of a patient's bones; b) analyzing the 3D model to select a desired correction angle to apply to the patient's tibia bone to adjust a mechanical axis thereof; c) determining surgical steps required to apply the desired correction angle to the patient's tibia bone; d) designing a patient-specific guide to guide generic surgical tools in performing the surgical steps, the patient-specific guide being designed to conform to the anatomy of the patient's bones based on the 3D model; and e) manufacturing the patient-specific guide designed in step d). A corresponding kit, system and computer readable medium for performing the method are also provided.

The invention discloses a novel extensible long intramedullary rod and a matched tool, and relates to the technical field of medical instruments, the novel extensible long intramedullary rod comprises a female rod and a male rod, one end of the female rod is provided with a fixed tip, the other end of the female rod is provided with a blind hole, the male rod is sleeved with the blind hole, the fixed tip is used for being connected with the epiphysis of the far end of a long bone, and the end of the male rod is flush with an implantation opening. And the length of the male rod sleeved into the female rod is at least 1 / 2 of the length of the female rod. The extensible long intramedullary rod can effectively fix a long bone, prevent fracture of the long bone and maintain the shape of the long bone, can gradually achieve the purpose of extension along with the growth of the bone, can better maintain the mechanical axis of the bone, has a stronger protection effect on the fracture end, is particularly suitable for being applied to special patients in the department of orthopedics of children, and has a wide application prospect. And intraoperative and postoperative protection of lower limb long bone malformation and fracture caused by osteogenesis insufficiency and congenital long bone artificial joints can be realized.

ORTHOPEDIC LEG ALIGNMENT SYSTEM AND METHOD Abstract An orthopedic measurement system is disclosed to measure leg alignment. The measurement system includes a tri-axial gyroscope con­ figured to measure movement of a leg. The gyroscope is coupled to a tibia of the leg. For example, the gyroscope can be placed in an insert or tibial pros - thetic component that couples to the tibia. The gyroscope is used to measure alignment relative to the mechanical axis of the leg. The leg alignment measurement is performed by putting the leg through a first leg movement and a second leg movement. The gyroscope outputs angular velocities on the axes the sensor is rotated about. The gyroscope is coupled to a computer that calculates the alignment of the leg relative to the mechanical axis from the gyro - scope measurement data. ORTHOPEDIC LEG ALIGNMENT SYSTEM AND METHOD Abstract An orthopedic measurement system is disclosed to measure leg alignment. The measurement system includes a tri-axial gyroscope con- figured to measure movement of a leg. The gyroscope is coupled to a tibia of the leg. For example, the gyroscope can be placed in an insert or tibial pros - thetic component that couples to the tibia. The gyroscope is used to measure alignment relative to the mechanical axis of the leg. The leg alignment measurement is performed by putting the leg through a first leg movement and a second leg movement. The gyroscope outputs angular velocities on the axes the sensor is rotated about. The gyroscope is coupled to a computer that calculates the alignment of the leg relative to the mechanical axis from the gyro - scope measurement data.20 25 20 12 68 21 F eb 2 02 5 O R T H O P E D I C L E G A L I G N M E N T S Y S T E M A N D M E T H O D A b s t r a c t 2 0 2 5 2 0 1 2 6 8 2 1 F e b 2 0 2 5

To select and accurately position a component of an artificial joint without excessively complicating a technique, inundating medical workers, and / or burdening a doctor or a medical facility with a large cost of a complicated navigation system.SOLUTION: The present invention provides, in certain embodiments, a device for determining a tibial mechanical axis and a femoral mechanical axis. The present invention also provides surgical orientation devices, reference devices, and / or modules configured to track mechanical axes during movement to facilitate limb alignment. The present invention further provides surgical orientation devices, reference devices, and / or modules configured to determine gap measurements.SELECTED DRAWING: Figure 12

A system may include an implantable device having at least a first sensor configured to collect first data regarding one or more characteristics of a bone of a patient, wherein the implantable device is configured for implantation in a medullary canal of the tibia. The system may include an attachment member configured to couple with the implantable device when the implantable device is implanted in the medullary canal of the tibia. The system may further include a targeting device moveably coupled to the attachment member, wherein the targeting device is configured to reference a distal anatomy of a leg, and wherein the targeting device has at least a second sensor configured to collect second data regarding at least a position of the targeting device.

Example methods and systems may be used intraoperatively to help surgeons perform accurate and replicable surgeries, such as knee arthroplasty surgeries. An example system combines real time measurement and tracking components with functionality to compile data collected by the hardware to register a bone of a patient, calculate an axis (e.g., mechanical axis) of the leg of the patient, assist a surgeon in placing cut guides, and verify a placement of an inserted prosthesis.

Disclosed herein are a system for determining ligament tension and a method for utilizing the same in a knee balancing procedure. The system according may include a first sensor to measure a first load at a first condyle of a femur, a second sensor to measure a second load at a second condyle of the femur, an inertial measurement unit to measure angular change of a tibial mechanical axis of a tibia during a rotation of the tibia in a coronal plane, and a display in communication with the first sensor, the second sensor and the inertial measurement unit for displaying a ligament stress-strain curve. The method may include the steps of rotating a tibia toward a first condyle, measuring first load values and first deflection angles of the tibia, and determining a stress-strain curve of a first ligament from the first load values and first deflection angles.

The present invention provides, in certain embodiments, a device for determining the tibial mechanical axis and the femoral mechanical axis. The present invention also provides a surgical orientation device, a reference device, and / or a module configured to track the mechanical axes during movement to facilitate limb alignment. The present invention further provides the surgical orientation device, the reference device, and / or the module configured to determine a gap measurement.

The application provides a method and device for measuring the angle between two bone blocks forming a joint, which can be used for real-time measurement of the flexion, valgus and varus angles of a knee joint in computer-aided knee joint replacement. The conversion relationship between the coordinate system of a 3D virtual bone model and the coordinate system of the markers collected from the actual bone surface is established by using an optical tracking system, and the angles are calculated by using the marker points extracted from the model, which are selected from the hip joint center H, the femoral knee joint center FK, the lateral epicondyle LE, the medial epicondyle ME, the tibial knee joint center TK, the tibial tuberosity TB and the ankle joint center AK. The method comprises the following steps: calculating the femoral mechanical axis direction vector and the tibial mechanical axis direction vector; calculating the flexion angle when the knee joint moves around the transverse axis on the sagittal plane. The valgus and varus angles can be determined by projecting the femoral axis and the tibial axis on the coronal plane Pc or the transverse plane. The application also provides a surgical robot system, a storage medium and a measuring device.

This application provides a method for calculating the lower limb force line angle in total knee arthroplasty, comprising: transforming a first skeletal mechanical axis at an initial position in an image coordinate system to a defined first prosthesis coordinate system; transforming the first skeletal mechanical axis in the first prosthesis coordinate system to a second prosthesis coordinate system when the first prosthesis rotates to the position of the condyle under weight-bearing; transforming the first skeletal mechanical axis in the second prosthesis coordinate system to the image coordinate system; and projecting the angle between the first skeletal mechanical axis and the second skeletal mechanical axis onto the coronal plane to obtain the lower limb force line angle. Using the condyle position as a transformation constraint, and through matrix transformation between the established skeletal coordinate system and the prosthesis coordinate system, the HKA angle is calculated intraoperatively, providing more accurate quantitative calculation results for total knee arthroplasty.

The utility model relates to the technical field of fracture reduction experiments, and provides a device for simulating mechanical shafts at the far end and the near end of a broken bone, which comprises two fixing supports, a plurality of groups of mounting holes are formed in one surfaces, close to each other, of the two fixing supports, and a plurality of connecting shafts are mounted in the mounting holes formed in the surfaces of the fixing supports. A plurality of adjusting rods are rotationally connected among the plurality of connecting shafts; a simulation mechanism is arranged between the two fixing supports, the adjusting rod is used for supporting and adjusting the relation between the two fixing supports, the simulation mechanism comprises a mounting plate, the mounting plate is movably connected to the outer side walls of the fixing supports, and positioning bolts are mounted between the fixing supports and the mounting plate; by designing a reusable simulation device, multiple groups of fracture malformation cases can be generated by using a single group of device, and the requirement that multiple bone samples need to be collected or 3D printing models need to be prepared again in each test is avoided, so that the experiment cost is remarkably saved.

The invention discloses a knee joint peripheral osteotomy display model which comprises a lower limb model, a force line simulation rod, a supporting structure and an osteotomy simulation device. A knee joint is arranged at the joint of the tibia model and the femur model, a first hinge is arranged in a tibia near-end area of the knee joint on one side, and a second hinge is arranged in a femur far-end area of the knee joint on the other side; the knee joint area on one side simulates knee joint varus deformity through a first hinge; the knee joint area on the other side simulates knee joint ectropion deformity through a second hinge; the force line simulation rod moves along with the correction of the varus and valgus of the knee joint so as to simulate the force line distribution condition before and after the varus and valgus correction. The display model can be used when operation propaganda and education are carried out on patients or operation knowledge teaching is carried out on students, the occurrence principle of knee joint ectropion and ectropion deformity and the operation principle and process of two specific correction operations can be displayed, and the purposes that the patients or the students can visually understand and learn can be achieved.

The present invention discloses a method for analyzing lower limb deformity, comprising the following steps: S1, obtaining lower limb images taken by an X-ray machine and splicing them to obtain a full image of the lower limb; S2, performing morphological processing based on color information, repairing the text area and reducing the watermark; S3, enhancing image contrast; S4, segmenting the enhanced image to remove muscle tissue and retain bone; S5, coarsely positioning the segmented image, obtaining a bounding box of key parts, and determining whether a prosthesis is implanted; S6, extracting edge information inside the bounding box, obtaining a closed contour, and constructing an edge set expressing bone characteristics; S7, calculating the mechanical axis based on the edge set, calculating the bone curvature, analyzing the lower limb deformity state, and visualizing the stress condition. Compared with the method based on the lower limb force line, the present invention uses the curvature of the bone itself for force analysis, which is more in line with the actual stress condition and can automatically mark the mechanical axis of the lower limb.

The present application relates to the Brown orthopedic traction device, it includes the leg rest structure and traction structure, wherein the leg rest structure includes the chassis, the calf support and the thigh support, the traction structure includes the traction frame, the frame wheel, the traction rope, the traction power device, the traction bow. One aspect of the present application not only reduces the difficulty of patient posture adjustment and operation, but also greatly reduces the risk of limb injury, body position discomfort, muscle tension, pressure sores and other complications caused by traction, and also reduces the risk of deformity healing or delayed healing rate; on the other hand, based on the height and angle adjustment of the traction frame, the position and traction direction of the traction bow are adjusted, without the need for further leg rest position adjustment, reducing the difficulty of traction; at the same time, based on the cooperation of the length and angle of the four-section traction rope, not only can the current traction be continued in the dynamic balance mode, but also the traction position and angle can be kept unchanged to implement the traction force change, so as to improve the traction direction and mechanical axis coincidence degree, thereby reducing the risk of traction injury.

The application relates to the medical technical field, in particular to a tibia model positioning method and device, wherein the method comprises the following steps: determining a tibia longest axis position in a target cross section based on the anatomical features of a human body; positioning an outermost point of a tibial tuberosity farthest from a mechanical axis based on the tibia longest axis position; and positioning a tibial coronal plane and a tibial sagittal plane of a tibia model based on the outermost point of the tibial tuberosity according to the distance and angle relationship between points at 1 / 3 and 1 / 2 positions of the tibial tuberosity on the target cross section. Thus, the problems that the coronal plane direction obtained in the related art is greatly different from the tibia platform long axis direction, the computer cannot automatically extract, especially for patients with damaged tibia, the clinical requirements cannot be met, and the tibia positioning accuracy and applicability are reduced are solved.

Disclosed herein are a system for determining ligament tension and a method for utilizing the same in a knee balancing procedure. The system according may include a first sensor to measure a first load at a first condyle of a femur, a second sensor to measure a second load at a second condyle of the femur, an inertial measurement unit to measure angular change of a tibial mechanical axis of a tibia during a rotation of the tibia in a coronal plane, and a display in communication with the first sensor, the second sensor and the inertial measurement unit for displaying a ligament stress-strain curve. The method may include the steps of rotating a tibia toward a first condyle, measuring first load values and first deflection angles of the tibia, and determining a stress-strain curve of a first ligament from the first load values and first deflection angles.

Example methods and systems may be used intraoperatively to help surgeons perform accurate and replicable surgeries, such as knee arthroplasty surgeries. An example system combines real time measurement and tracking components with functionality to compile data collected by the hardware to register a bone of a patient, calculate an axis (e.g., mechanical axis) of the leg of the patient, assist a surgeon in placing cut guides, and verify a placement of an inserted prosthesis.

The invention relates to a traction frame of a Braun orthopedic traction device, which comprises a traction frame, a frame wheel, a traction rope, a traction power device and a traction bow. The traction frame is adjusted in front and back by a locking part from the bottom relative to the leg rest frame. The height of the frame top is adjusted by the extension and contraction of the left and right sides of the traction frame. The frame wheel comprises a first, second and third pulley group. The traction rope comprises a first, second, third and fourth section. The invention adjusts the position and direction of the traction bow based on the height and angle of the traction frame without adjusting the leg position again, which reduces the difficulty of traction. The length and angle of the four sections of the traction rope cooperate, which not only continuously tractions in the dynamic balance mode, but also changes the traction force while keeping the traction position and angle unchanged, which improves the traction direction and the mechanical axis, thereby reducing the risk of traction injury.

This invention discloses a high-precision measurement system and method for lower limb force lines based on visual navigation, specifically relating to the field of medical visual-assisted navigation technology. The system consists of a navigation processing computer, a measuring camera, and a feature cursor tool representing the knee joint cross-section. First, the measuring camera captures an image of the cursor tool and transmits it to the navigation processing computer. After image correction and other operations, a preprocessed image is obtained. Second, an intelligent learning algorithm is used to identify, repair, and locate the feature cursors in the preprocessed image, obtaining the coordinates of each feature cursor in the measuring camera's coordinate system. Through multiple measurements, the coordinates of the knee joint center and femoral head center, as well as the mechanical axis length, are estimated, yielding the ideal knee joint cross-section equation and the knee joint cross-section equation. Based on the spatial relationship between the two cross-sections, the varus / valgus angle and anteroposterior / posterior tilt angle of the lower limb force line are obtained. This measurement system is reusable, has high measurement accuracy, and has significant potential for widespread application.

The invention discloses a femur extension screw placement guide device, which relates to the technical field of medical instruments and comprises a positioning datum plate, a locking piece and a screw placement guide plate. A positioning guide hole is formed in the positioning datum plate, and a first inserting part is arranged at one end of the positioning datum plate; the two locking pieces are located at the two ends of the positioning guide hole. The two ends of the screw placement guide plate are each provided with a second inserting part, a screw placement guide hole is formed in the screw placement guide plate, and the axis of the screw placement guide hole and the axis of the positioning guide hole are located in the same plane and form an angle of 5-7 degrees. After the positioning needle penetrates through the positioning guide hole and is nailed into the femoral bone, the second inserting part is inserted into the first inserting part, and the axis of the screw placing guide hole can be perpendicular to a mechanical shaft of the femoral bone, so that the fixing needle can be nailed in perpendicular to the mechanical shaft; the positioning datum plate horizontally rotates by 180 degrees, and then the other second inserting part is inserted into the first inserting part, so that the axis of the screw placing guide hole is parallel to the nailed fixing needle, and an operator does not need to manually measure the angle.

This invention relates to a method and system for assisting in the identification of knee alignment anomalies considering anatomical constraints. The method includes: acquiring the original aspect ratio of a raw medical image; adaptively filling the raw medical image based on a comparison between the original aspect ratio and a target aspect ratio; using the filled image as input to a depth coordinate regression model to obtain normalized coordinate vectors of key feature points based on global anatomical constraints; converting the normalized coordinate vectors into physical coordinates in the original coordinate system; calculating the angle between the femoral mechanical axis vector and the tibial mechanical axis vector, and calculating the vertical distance from the center point of the knee joint to the total mechanical axis of the lower limb; and generating knee alignment anomaly identification prompts. Compared with existing technologies, this invention has advantages such as accurate geometric measurements, strong robustness, high clinical deployment efficiency, and reliable identification results.