3D force sensor of keen joint prosthesis pad and contact stress measuring method of sensor

Abstract

The invention relates to a 3D force sensor of a keen joint prosthesis pad and a contact stress measuring method of the sensor, and belongs to the technical field of medical apparatuses. The 3D force sensor can be applied to a femoro-tibia articulation, and comprises an intermediate flexible elastic layer, an upper hard layer and a lower hard layer, the intermediate flexible elastic layer comprisesupper and lower curved surfaces, and the upper or lower curved surface is provided with induction components; the shape of the upper hardness layer is adapted to that of the upper curved surface, andthe upper hardness layer is fit to the upper curved surface; and the shape of the lower hardness layer is adapted to that of the lower curved surface, and the lower hardness layer is fit to the lowercurved surface. The size, direction and position of a contact resultant force in the femoro-tibia articulation can be calculated via certain algorithm, measured values are more accurate, 3D resultantforce of the joint contact stress can be calculated, stress distribution approaching the practicality can be obtained, and quantitative guidance is provided for determining articulation force distribution condition and soft tissue balance link.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to a three-dimensional force sensor of a knee joint prosthesis gasket and a method for measuring contact stress thereof. Background technique [0002] Soft tissue balance is an important link in total knee arthroplasty (TKA). The quality of its treatment directly affects the stability and function of the knee joint after surgery. With the extensive development of research at home and abroad, people's understanding of soft tissue balance has gradually deepened. In TKA, the so-called soft tissue balance mainly involves stable static structures such as knee ligaments and joint capsules, that is, the pursuit of "ligament balance", emphasizing that on the basis of correct osteotomy, by loosening ligaments, joint capsules, etc. The starting point or the end point can restore the normal force line arrangement of the joint, thereby restoring the normal contact point of the articula...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a three-dimensional force sensor for a knee joint prosthesis and its contact stress measurement method, aiming to solve the problem that the knee joint prosthesis spacer sensor in the prior art can only measure one direction of the joint contact stress The size of the component makes it unable to reflect the technical problem of the real stress distribution

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