Modular Interim Joint Prosthesis with Anti-Adhesive Coating
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Solution Overview
Problem
Current joint prostheses face challenges such as tissue shortening and muscle weakening due to immobilization and heat damage from bone cement spacers during revision surgeries, especially in cases of sepsis or tumor removal, where the existing bone cement spacers lack mechanical support and cause thermal necrosis.
Innovation Solution
A modular interim joint prosthesis with a main body and shaft coupling segments, made of metal or plastic, featuring anti-adhesive coatings and antibiotic-infused matrices to prevent tissue ingrowth and heat damage, allowing for individual adaptation and increased strength, enabling patient mobility during the healing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If bone cement is used to fill the cavity after explantation, then the cavity is filled and space is maintained, but thermal necrosis of surrounding bone tissue occurs due to heat development during curing
Solution Approach 1:
The patent extracts the harmful curing process from the spacer material by using pre-cured foam material instead of uncured bone cement. The foam material is inserted in its already cured state, eliminating the exothermic reaction that causes thermal necrosis while maintaining the cavity-filling function.
Solution Approach 2:
The patent employs a disposable foam spacer that is inserted pre-cured and serves its temporary function during the healing period. The foam material is designed to be biodegradable or removable, avoiding the need for long-term retention and eliminating the harmful curing process entirely.
2Volume of stationary object
If bone cement spacer is used to occupy the dissected bone space, then the space is maintained, but mechanical support is insufficient and patient mobility is not enabled
Solution Approach 1:
The patent uses foam material with optimized cellular structure that provides both volume occupation and mechanical support. The foam's cellular architecture gives it sufficient compressive strength to maintain the dissected bone space while allowing controlled patient mobility during the healing period.
Solution Approach 2:
The patent changes the material parameters by selecting foam with specific density and cellular structure variations. Different foam densities provide different levels of mechanical support while maintaining the space-filling function, allowing customization based on the patient's mobility needs and healing stage.
3Reliability
If patient is immobilized during spacer use to treat sepsis, then sepsis treatment is facilitated, but muscle tissue weakens and ligament apparatus deteriorates
Solution Approach 1:
The temporary foam spacer enables a controlled treatment period for sepsis while maintaining sufficient mechanical support. The spacer's temporary nature allows for a defined healing period without long-term immobilization, after which the spacer is removed and full rehabilitation can begin.
Data Source
AI summary
The invention relates to a modular interim joint prosthesis that can be inserted into a long bone, for replacing an explanted joint endoprosthesis, wherein the interim joint prosthesis has a main body having a main-body coupling segment and has a shaft having a shaft coupling segment and the shaft coupling segment can be detachably coupled to the main-body coupling segment.