In Vivo Implant Elastomer Sealing for Wear Debris Containment
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Solution Overview
Problem
Existing in vivo orthopedic implants suffer from wear debris diffusion due to relative motion between components, leading to inflammatory reactions and metal ion release, with conventional seals failing to effectively prevent wear debris from escaping and causing adverse health effects.
Innovation Solution
An elastomer seal with a flexible buffer part is used to seal the outlet for wear debris, allowing it to be contained within a sealing area formed by the implant components, and the buffer part absorbs relative motion to reduce wear, using materials like medical silica gel or PU to maintain a tight seal without preventing relative motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional O-ring seal is used to seal the interface between moving components, then wear debris diffusion is reduced, but the sealing ring fails frequently due to limited space and elastic range
Solution Approach 1:
The patent uses a flexible elastomer seal material that can deform to accommodate relative motion between components while maintaining a seal. The elastomer's flexibility allows it to absorb motion without exceeding elastic limits, preventing seal failure while blocking wear debris pathways.
Solution Approach 2:
The patent changes the material parameters of the seal from conventional rigid O-rings to elastomeric materials with specific viscoelastic properties. This material parameter change enables the seal to dynamically adapt to varying motion conditions, maintaining sealing effectiveness throughout the implant's service life.
2Ease of operation
If the sealing ring is made smaller to fit limited space, then installation is easier, but wear debris can still escape through the clearance
Solution Approach 1:
The elastomer seal forms a continuous flexible barrier that conforms to the implant interface geometry. This flexible membrane seal eliminates gaps and clearances that would allow wear debris escape, while the elastomer's compliance enables easy installation in confined spaces.
3Adaptability or versatility
If relative motion between implant components is allowed to maintain function, then implant performance is preserved, but wear debris is generated and diffuses outward
Solution Approach 1:
The elastomer seal acts as an intermediary element between the moving implant components. It allows the components to slide relative to each other while intercepting and containing wear debris within the seal barrier, preventing debris from reaching surrounding tissues.
Solution Approach 2:
The patent converts the harmful effect of relative motion (which generates wear debris) into a beneficial sealing mechanism. The elastomer seal deforms in response to the motion, using the motion energy to maintain seal contact pressure while blocking the wear debris pathways created by the same motion.
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 elastomer seal effectively limits wear debris diffusion, reducing adverse health effects by containing wear debris within the implant and minimizing seal wear, while allowing for relative motion between components, thus decreasing the risk of inflammation and metal ion release.
Implementation Method 1
The elastomer seal includes at least one flexible buffer part for reducing or completely offsetting relative motion between the implant components
Implementation Method 2
an outlet for wear debris of the implant is always sealed within a sealing area formed by the seal and the implant components, thereby preventing the wear debris from diffusing outwards
Data Source
AI summary
Disclosed is a method for limiting diffusion of wear debris of an in vivo implant and an in vivo implant apparatus with a function of limiting wear debris. According to the present invention, an elastomer seal is arranged at a wearing part between implant components that can move relatively and generate wear, such that an outlet for wear debris of the implant is always sealed within a sealing area formed by the seal and the implant components, thereby preventing the wear debris from diffusing outwards. The elastomer seal includes at least one flexible buffer part for reducing or completely offsetting relative motion between the implant components, thereby further reducing wear of a sealing part of the elastomer seal due to the relative motion between the parts. According to the present invention, the seal is tightly attached to in vivo implant components, such that the wear debris cannot escape, and a friction force between the seal and the in vivo implant is smaller than a force for driving the components to generate relative motion, such that the relative motion between the components may not be blocked, thereby solving the problem of wear debris escaping.