12 results about "Femur" patented technology

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.

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.

This application discloses an automatic analysis method for CT images of long bones in mice and rats, relating to the field of image processing technology. The method includes: acquiring a CT image sequence of the target long bone, extracting the three-dimensional spatial distribution of bone tissue, and performing pose alignment and three-dimensional cropping to obtain a standardized bone image sequence; then constructing candidate depth intervals based on butterfly-shaped anatomical features and key points of growth plate strip-shaped gaps, respectively, and obtaining a fine search range through intersection operation; subsequently identifying candidate slices of triangular fractures and determining the anatomical zero point; finally, mapping the target analysis region based on the anatomical zero point, completing cortical bone segmentation, medullary cavity segmentation, and trabecular bone extraction under closed mask constraints, and outputting quantitative parameters of bone tissue. This application achieves accurate positioning of the growth plate and unified analysis region mapping in long bone CT images, improving the accuracy of trabecular bone extraction and the consistency of bone tissue quantification results.

This invention belongs to the field of medical device technology, specifically relating to an adjustable fixation and retraction device and its usage method for knee replacement surgery. It includes two supporting components, each comprising a guide rail with a horizontal bar slidably connected to it. A locking mechanism is located at one end of the horizontal bar near the guide rail, and a first vertical bar is fixedly mounted at the other end of the horizontal bar. A second vertical bar is fixedly mounted at the end of the guide rail away from the horizontal bar. Hoffman hooks are fixedly mounted at the lower ends of both the first and second vertical bars. These Hoffman hooks are used to hook the tibia and femur, respectively. This invention, by sliding the horizontal bar on the guide rail and using the locking mechanism, allows for stepless or graded adjustment of the distance between the first and second vertical bars on the same supporting component. The surgeon can quickly adjust the lateral span of the two Hoffman hooks according to the actual width of the patient's tibial plateau or femoral condyle, ensuring stable hooking at the optimal bony attachment point.

The utility model belongs to the field of elevating operation platform especially, a kind of self-locking anti-falling elevating operation platform, to the falling risk problem caused by adventurous behavior (such as exploring body, leaning) or environmental factors (such as inclination, strong wind) of personnel in complex working conditions of existing traditional platform, present and propose the following scheme, it includes concave seat, platform body, driver and safety mechanism.Safety mechanism adopts the sliding limit design of H type moving block and connecting frame, cooperate high-strength connecting rope (steel wire rope / iron chain), when personnel falls, pull distance, form physical hover;Waistband and leg fixed band pass through female buckle-male buckle quick coupling, construct the three-point fixed structure of waist-thigh-inner side of leg, make falling impact force evenly distribute in pelvic and femur, avoid soft tissue injury.Driver adopts cross shear type lifting structure, ensure that platform body stably lifts through the rolling cooperation of guide wheel and guide slot.Door body sets up the double locking mechanism of T type bolt and insert ring, prevent misopening.

A boundary assessment instrument includes a spacer block, a tibial alignment rod that aligns with the patient’s ankle, and a femoral alignment rod that aligns with a patient’s hip. A varus / valgus angle gauge displays the varus / valgus angle of the installed spacer block. A hip-knee-ankle angle gauge displays the overall hip-knee-ankle angle of the patient’s leg created by the installed spacer block. A method of surgically preparing a patient’s femur and tibia is also disclosed.

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.

A distal femoral jig includes an alignment guide and an outrigger component. A segmented intramedullary rod instrument may be used to install the alignment guide on a patient's femur. The alignment guide is configured to contact the distal femoral condyles of the patient's femur so as to align a distal cutting block coupled to the outrigger component. The distal femoral jig may be operated in either a mechanical alignment mode of operation or a kinematic alignment mode of operation. Methods of surgically preparing a patient's femur are also disclosed.

The invention relates to a spacer mould used in the field of health, particularly in orthopaedics and traumatology, during the treatment of infections around knee prostheses. The invention particularly relates to a spacer mould for the femur and the tibia, comprising detachable and nested moulds, by means of which the length can be adjusted with the locked structure and the antibiotic cement to be seated can be shaped in the desired size.

A kind of detection system and method of knee cartilage degeneration gait graph feature, at least including rack, the surface of the rack is provided with belt conveyor, the upper surface of the rack is fixedly connected with support frame;Work position conversion mechanism, for triggering the switching of measured object from first work position to second work position;Detection acquisition subsystem: it further includes several markers and high-speed camera in image acquisition device, the image acquisition device is used to respectively collect tester in first work position, joint three-dimensional six degrees of freedom motion data in second work position, the three-dimensional six degrees of freedom motion data include flexion, eversion, internal rotation, forward displacement, internal displacement and upward displacement of joint in space;Controller: for extracting the tibia-femur kinematics data of test leg, at least including medial compartment KOA knee varus angle, lateral compartment KOA knee valgus angle in the knee cartilage degeneration gait graph feature point information, and is uniformly regressed as several data points, forms current motion situation curve information.

The disclosure provides a femur and tibia contact surface, length determination, image processing method and system and X-ray camera, and relates to the technical field of determining the contact surface and length of the femur and tibia. The contact surface determination method comprises the following steps: obtaining a femur region mask image and a tibia region mask image corresponding to a to-be-processed knee joint X-ray image; determining an overlapping region corresponding to a femur region mask in the femur region mask image and a tibia region mask in the tibia region mask image; and configuring the overlapping region as a contact surface of the femur and tibia in the to-be-processed knee joint X-ray image. The embodiment of the disclosure can realize the contact surface, length determination and image processing of the femur and tibia.

A positioning device for generating merchant views of the knee joint is disclosed. The positioning device includes a frame. The positioning device also includes a femoral positioning plate coupled to the frame and configured to position a femur of the patient in a predefined position. Additionally, the positioning device includes a tibial positioning plate coupled to the frame and configured to position a tibia of the patient in about 45 degrees of flexion.