Hemi-Prosthesis Coating Adhesion via Substrate Relief
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Solution Overview
Problem
Hemi-prosthesis implants face challenges in securely attaching less rigid materials to rigid substrates due to inadequate frictional compatibility between strong prosthesis materials and natural cartilage, leading to potential cartilage damage and instability.
Innovation Solution
A hemi-prosthesis design featuring a substrate with a relief structure for improved adhesion of a less rigid coating material, such as a thermoplastic elastomer or polyethylene, which is applied to the articulation surface of the implant, allowing for secure and permanent attachment while minimizing stress on the cartilage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If strong prosthesis materials such as metal or ceramic are used for the replacement joint part, then the implant strength is improved, but the frictional compatibility with natural cartilage deteriorates causing cartilage damage
Solution Approach 1:
The patent applies composite materials by combining a rigid substrate (metal or ceramic) with a less rigid coating material that provides good frictional compatibility with natural cartilage. This composite structure allows the implant to have both the strength of rigid materials and the cartilage-friendly surface properties of softer materials, resolving the contradiction between implant strength and frictional compatibility.
2Object-affected harmful factors
If less rigid materials are used for the articulation surface to improve frictional compatibility with cartilage, then the biocompatibility is improved, but the structural strength deteriorates
Solution Approach 1:
The patent uses composite materials where a less rigid coating material is applied over a rigid substrate. The coating provides good frictional compatibility with cartilage while the substrate maintains structural strength, allowing the implant to satisfy both requirements simultaneously.
Solution Approach 2:
The patent segments the implant into two functional parts: a rigid substrate that provides structural strength and a less rigid coating that provides frictional compatibility. This segmentation allows each part to fulfill its specific function without compromising the other.
3Object-affected harmful factors
If a coating is applied to the substrate to provide cartilage-sparing surface, then the frictional compatibility is improved, but the attachment stability deteriorates due to inadequate relief structure
Solution Approach 1:
The patent applies local quality by creating a relief structure with localized protrusions and recesses on the substrate surface. This relief structure provides specific local attachment points for the coating material, enhancing mechanical interlocking and attachment stability while maintaining the overall cartilage-sparing surface properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances the biocompatibility and longevity of the implant by ensuring a stable and secure attachment of the coating to the substrate, reducing the risk of cartilage damage and providing a durable, cost-effective alternative to total prostheses.
Implementation Method 1
The substrate provides a relief for the adhesion of the coating
Data Source
AI summary
A hemi-prosthesis implant comprises a replacement-joint part with an articulation surface for tribological pairing with a joint surface of a natural joint counterpart. The articulation surface is embodied with a coating applied on a substrate. The substrate provides a relief for the adhesion of the coating. The relief may comprise one or more of a plurality of grooves, a plurality of teeth, a ribbing, and a roughened surface. The relief may be embodied entirely or partially outside the articulation surface. The replacement joint part may optionally comprise a ventilation feature, and the articulation surface may be formed by injection molding on the substrate. The hemi-prosthesis implant may be part of an implant set that includes both a hemi-prosthesis implant and a total prosthesis implant, either of which can be chosen intraoperatively.