Bone Joint Implant Non-Metallic Wear Surface
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Solution Overview
Problem
Current orthopaedic implants often experience uncontrolled impingement, leading to instability, accelerated wear, and unexplained pain due to abrupt changes in force distribution between components, which can result in dislocation and poor outcomes.
Innovation Solution
The design incorporates a non-metallic wear surface with a buffer interface, such as a flange or coating, to limit contact between implant components and distribute forces more naturally, using a ball-and-socket coupling with a resilient polymer insert to prevent rotation and disassembly, thereby controlling articulation and reducing impingement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metallic platform and stem are used for the implant, then structural strength and load-bearing capacity are improved, but impingement and accelerated wear occur due to rigid contact between components
Solution Approach 1:
The patent combines metallic components (platform and stem) with a non-metallic polymeric liner to create a composite implant structure. The metallic platform provides structural strength and load-bearing capacity, while the polymeric liner reduces impingement and accelerated wear by providing a compliant, non-impinging interface between the platform and stem during articulation.
2Stability of the object's composition
If a rigid articulating coupling is used to maintain joint stability, then joint stability is improved, but impingement occurs due to abrupt force changes during motion
Solution Approach 1:
The patent changes the material parameter of the articulating interface from rigid (metal-to-metal) to compliant (metal-to-polymer). The polymeric liner absorbs abrupt force changes during articulation through elastic deformation, preventing impingement while maintaining joint stability through controlled motion.
3Ease of operation
If the range of motion is increased to improve joint functionality, then ease of operation is improved, but impingement risk increases due to component contact
Solution Approach 1:
The polymeric liner acts as an intermediary element between the metallic platform and stem. It allows increased range of motion by providing a compliant interface that prevents direct metal-to-metal contact during articulation, thereby reducing impingement risk while maintaining functional mobility.
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
This solution effectively reduces the likelihood of impingement, stabilizes the joint, and prolongs the implant's lifespan by distributing stress evenly across the articulating surfaces, minimizing the risk of dislocation and wear.
Implementation Method 1
a non-metallic wear surface with a buffer interface, such as a flange or coating, to limit contact between implant components and distribute forces more naturally
Implementation Method 2
using a ball-and-socket coupling with a resilient polymer insert to prevent rotation and disassembly, thereby controlling articulation and reducing impingement
Data Source
AI summary
Bone joint implants are described herein. The bone joint implants may comprise a metallic proximal platform configured for translational motion on the trapezium bone; a distal stem configured for intramedullary engagement with an end of the first metacarpal bone; an articulating coupling between the proximal platform and distal stem; and a proximal non-metallic wear surface and a distal non-metallic wear surface.