Electromagnetic Joint Replacement Bearing Reducing Wear
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Solution Overview
Problem
Current total joint replacement (TJR) designs fail to adequately address the increased wear and implant failures in active and younger patients due to inflammatory responses from wear particle debris, necessitating a reduction in frictional forces within the joint.
Innovation Solution
A magnetic bearing couple utilizing electromagnetic induction to create a stable repulsive magnetic force, promoting fluid-film lubrication and optional separation of opposing joint surfaces, thereby reducing friction and wear particle production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TJR designs are used, then the implants are successful in patients with limited activity levels, but they fail in active and younger patients due to wear particle debris causing inflammatory responses
Solution Approach 1:
The patent replaces the traditional mechanical contact system with an electromagnetic system. Electromagnetic induction generates repulsive forces between the femoral head and acetabular liner, eliminating direct mechanical contact and the associated wear particle generation that causes inflammatory responses in active patients.
Solution Approach 2:
The patent changes the physical state of the joint interface by introducing electromagnetic fields. By varying magnetic field strength and conductivity parameters, the system transitions from solid-to-solid contact to a non-contact electromagnetic interaction, reducing friction and wear particles.
2Force
If electromagnetic induction is used to produce repulsive magnetic force, then friction is reduced and joint surfaces are separated, but device complexity increases
Solution Approach 1:
The system uses the body's natural motion of the joint to generate the electromagnetic effect. The relative motion between the conductive femoral head and the magnetic acetabular liner automatically induces repulsive forces through electromagnetic induction, eliminating the need for external power sources or control systems.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary between the femoral head and acetabular liner. This field-mediated interaction reduces direct mechanical contact while maintaining load-bearing capability, simplifying the overall system compared to active control mechanisms.
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 solution effectively reduces friction and wear particle generation, enhancing the longevity and performance of TJR implants in active patients by minimizing joint surface contact and promoting fluid-film lubrication.
Implementation Method 1
relative motion between the opposing joint surfaces induces current loops in the conductive surface and produces a repulsive force against the magnetic portion
Data Source
AI summary
The disclosure provides a joint replacement coupling comprising joint members with opposing joint surfaces, wherein one of the members has a magnetic portion therein which comprises an array of magnets, and the other of the members has a conduction portion therein that comprises a conductive surface. The magnets are arranged to produce a magnetic field that contacts the conduction portion. The conduction portion is optionally positioned so that at least a portion of the conductive surface contacts the magnetic field so that relative motion between the opposing joint surfaces induces current loops in the conductive surface and produces a repulsive force against the magnetic portion, thereby reducing friction between the joint surfaces, optionally separating the joint surfaces.