Ceramic Joint Implant Stress Distribution Ring
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Solution Overview
Problem
Ceramic joint prosthesis implants are prone to cracking or rupture due to localized mechanical stresses from screw tightening, which is a concern for both surgeons and patients, and are not authorized for replacement after failure, necessitating the exploration of alternative materials.
Innovation Solution
A ceramic joint prosthesis implant design featuring a main body with a ceramic external articular surface and an attached ring that distributes mechanical stresses evenly, preventing localized stress concentrations and potential breakage, where the ring can be made of various materials including metal, plastic, or ceramic, and is configured to trap the screw head and provide a bearing surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic material is used for joint prosthesis implant, then biocompatibility and friction properties are improved, but risk of cracking or breakage increases due to low ductility and localized mechanical stresses
Solution Approach 1:
The implant is divided into two distinct parts: a ceramic main body providing biocompatibility and friction properties, and a separate retaining ring providing mechanical strength and stress distribution. This segmentation allows each material to perform its optimal function without compromising the other.
Solution Approach 2:
The implant combines ceramic and metal materials in a composite structure. The ceramic main body maintains biocompatibility and friction characteristics, while the metal retaining ring provides ductility and stress distribution capability, creating a hybrid material solution that overcomes the limitations of pure ceramic.
2Reliability
If ceramic material is used for joint prosthesis implant, then friction properties are improved, but risk of breakage increases due to very high and localized mechanical stresses during tightening
Solution Approach 1:
The retaining ring acts as an intermediary element between the ceramic main body and the tightening screw. It mediates the mechanical stresses by providing a bearing surface that distributes forces evenly across the ceramic structure, preventing direct concentration of stress on the ceramic material during tightening operations.
3Ease of operation
If tightening screw is used to secure implant, then fixation is improved, but localized mechanical stresses cause cracking or breakage of ceramic main body
Solution Approach 1:
The retaining ring is positioned specifically at the location where the tightening screw applies stress. This local reinforcement creates a stress distribution zone that protects the ceramic main body from localized cracking while allowing the tightening screw to maintain its fixation function.
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~3C
AI summary
The invention relates to a joint prosthesis implant (1; 100) comprising: - a main body (2; 200) mainly of ceramic and comprising an external articular surface (8) of ceramic of concave or convex shape, - at least one clamping screw (5) configured to allow the clamping of the main body (2; 200) on the patient's bone or on an intermediate element (3) fixed to said bone, - at least one ring attached (4) in the main body (2; 200) configured to distribute the mechanical stresses from the tightening of the clamping screw (5) homogeneously within the main body (2; 200).