Interphalangeal Arthrodesis Implant Stop Surface Anchoring
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Solution Overview
Problem
Existing interphalangeal arthrodesis implants face challenges in ensuring reliable fastening of sectioned phalanges due to displacement and depression of the proximal anchor portion during insertion, leading to improper anchoring of the distal anchor portion.
Innovation Solution
The interphalangeal arthrodesis implant features a proximal anchor portion with branches and a distal anchor portion, including a stop surface that limits depth depression, ensuring stable anchoring and elasticity for optimal bone consolidation, with anchor elements enhancing stability and bone fusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distal anchor portion is inserted into the medullary canal of the second phalanx, then the anchoring of the distal anchor portion is achieved, but the proximal anchor portion displaces and depresses beyond its predetermined position
Solution Approach 1:
A stop portion is provided on the connecting portion that acts in advance to prevent the proximal anchor portion from depressing beyond its predetermined position. This preliminary constraint ensures that when the distal anchor portion is inserted, the proximal anchor portion remains at the correct position, allowing both anchor portions to be properly anchored without displacement.
2Ease of operation
If the proximal anchor portion is depressed beyond its predetermined position, then the insertion process continues, but the final anchoring of the distal anchor portion is impaired
Solution Approach 1:
The stop portion is designed to engage with the medullary canal wall or a reference surface at the predetermined position of the proximal anchor portion. This preliminary engagement prevents further depression during the insertion process, ensuring that the anchoring reliability is maintained while still allowing easy insertion up to the correct depth.
3Manufacturing precision
If a stop portion is added to limit depression, then position precision is improved, but device complexity increases
Solution Approach 1:
The stop portion is integrated into the connecting portion that already connects the proximal and distal anchor portions. By merging the stop function with the existing connecting structure, the design achieves position precision without significantly increasing device complexity. The stop portion becomes an additional feature of the connecting portion rather than a separate component.
Data Source
AI summary
This interphalangeal arthrodesis implant comprises a proximal anchor portion intended to be engaged and anchored in the medullary canal of a first phalanx sectioned along a first osteotomy plane, the proximal anchor portion including a plurality of proximal anchor branches each provided with at least one bone anchor element; and a distal anchor portion, connected to the proximal anchor portion, intended to be engaged and anchored in the medullary canal of a second phalanx sectioned along a second osteotomy plane, the distal anchor portion including a plurality of distal anchor branches each provided with at least one bone anchor element. The distal anchor portion comprises a stop portion including a stop surface intended to bear against a sectioned surface of the first phalanx extending along the first osteotomy plane.