Modular Spacer Device with Segmented Coupling
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Solution Overview
Problem
Current spacer devices for treating infected joint prostheses face challenges with durability, ease of use, and limited capacity for medical substance delivery, particularly due to inadequate coupling mechanisms and material constraints.
Innovation Solution
A modular spacer device with a stem element and adjustable head, featuring a robust coupling mechanism and recesses for independent medical substance delivery, allowing for customizable treatment based on anatomical needs and extended infection management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bayonet coupling mechanism is used between the head and stem element, then the device can be adjusted for different patients, but the coupling components are subjected to concentrated pressures and forces leading to breakage risk and reduced durability
Solution Approach 1:
The bayonet coupling mechanism is divided into multiple identical coupling components distributed around the stem element. Instead of relying on a single coupling point, the load is distributed across multiple segments, reducing stress concentration on individual components and improving overall durability while maintaining adjustability.
2Adaptability or versatility
If a bayonet coupling mechanism is used, then the device is adjustable, but the coupling mechanism is not easy to actuate and is not quick to use, prolonging implant times
Solution Approach 1:
The coupling mechanism incorporates self-aligning features and snap-fit elements that automatically engage when the head is positioned on the stem. The multiple coupling components are designed to engage sequentially without requiring precise manual alignment, allowing the surgeon to quickly secure the assembly without complex manipulation.
3Quantity of substance
If the spacer device is made of porous material to be impregnated with medical substances, then the device can release pharmaceutical substances, but the quantity of medical substance that can be impregnated is limited due to geometry and material nature
Solution Approach 1:
The spacer device is divided into multiple porous segments or zones, each capable of being impregnated with medical substances. This segmentation increases the total surface area and volume available for substance impregnation, allowing greater quantities of pharmaceutical agents to be loaded while maintaining the structural integrity and geometric requirements of the device.
Data Source
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AI summary
A modular spacer device implantable in the human body for the treatment of an infected articular seat, comprising a stem element, a head or ball element and coupling elements between the stem element and the head, wherein such coupling elements comprise a plurality of elongated teeth, placed at pre-established distances from each other, and a plurality of housing seats for the teeth themselves.