Ceramic Multi-Hooded Joint Implant Reduces Dislocation
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Solution Overview
Problem
Existing enarthrodial joint implants face issues with dislocation, wear debris production, and potential allergic reactions due to the use of materials like UHMWPE and metal-on-metal or metal-on-ceramic articulations, which can lead to osteolytic loosening and biologic complications.
Innovation Solution
A multi-hooded enarthrodial joint implant with a ceramic articulating cup and a modular stem arrangement, featuring a ceramic head with a truncated cross-section and optional securing members, designed to reduce dislocation risk and wear debris, while avoiding metal to minimize allergic reactions and osteolytic loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resilient materials like UHMWPE are used for the cup, then dislocation resistance is improved, but wear debris production increases leading to osteolytic loosening
Solution Approach 1:
The patent employs a composite structure combining ceramic hard surface for wear resistance with a resilient outer layer for dislocation protection. The ceramic layer provides a hard-wearing articulating surface that minimizes wear debris, while the resilient material layer surrounding it provides dislocation resistance, thus combining the benefits of both material types without their individual drawbacks.
2Object-generated harmful factors
If metal-on-metal or metal-on-ceramic articulation is used, then wear debris is reduced, but allergic reactions and biologic complications increase
Solution Approach 1:
The patent extracts and eliminates metal components from the articulation system, using ceramic materials instead. This removes the source of metal wear debris and eliminates the risk of metal-related allergic reactions and biologic complications, while maintaining the benefits of hard-surface-on-hard-surface wear characteristics.
3Object-generated harmful factors
If ceramic wear couples are used, then osteolytic loosening is reduced, but dislocation resistance decreases due to rigidity
Solution Approach 1:
The patent employs a composite structure combining ceramic hard surface for wear resistance with a resilient outer layer for dislocation protection. The ceramic layer provides a hard-wearing articulating surface that minimizes wear debris, while the resilient material layer surrounding it provides dislocation resistance, thus combining the benefits of both material types without their individual drawbacks.
4Reliability
If hoods are added to constrain dislocation, then dislocation resistance is improved, but device complexity and bulk increase
Solution Approach 1:
The patent uses a resilient material layer that forms a flexible protective shell around the ceramic cup. This resilient layer acts as a soft hood that provides dislocation resistance through its elastic properties, allowing the ball head to be retained without requiring bulky mechanical constraints or complex retaining structures.
Data Source
AI summary
Multi-hooded enarthrodial joint implant has a ceramic articulating cup including a ceramic head-receiving cup having an articular surface upon which a head of a joint can articulate, and which, in general, has a margin generally about a hemisphere more or less and at least two hoods that are marginally extended continuations of superior one-half or so of cup containment of a sufficient magnitude to reduce an overall dimension of socket outlet to less than a hemisphere, which can embrace and contain the head. The head is made of ceramic and has a truncated generally circular cross section, a truncated surface with a feature for attachment of the stem, and an opposing articular surface for articulation against the articular surface of the ceramic head-receiving cup. As an ensemble, the cup is combined with the head, typically with a stem, for a total joint implant.