Bioresorbable Asymmetric Pin for Toe Osteosynthesis
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Solution Overview
Problem
Current osteosynthesis devices for joint fragments and toe misalignments face challenges such as inadequate rotational stability, risk of inter-fragmentary shearing motions, and prolonged immobilization, which can compromise joint function and healing processes.
Innovation Solution
A bioresorbable pin with a non-circular cross section and a central axis, designed for rotational stability, combined with a drill bit that allows for precise and stable fixation, ensuring the pin's secure placement without compromising bone strength or blood supply, and a kit that includes a drill with a smaller diameter for effective implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a round cross-section pin is used for fixation, then the pin can be easily inserted, but rotational stability is lacking allowing bones to turn around the tube
Solution Approach 1:
The pin cross-section is changed from a symmetric circular shape to an asymmetric shape with at least one flat side or ridge. This asymmetric geometry prevents rotational movement of the pin within the bone tunnel while maintaining ease of insertion through the asymmetric profile matching the prepared tunnel shape.
2Strength
If multiple pins are placed in joint fragments, then fixation strength is improved, but the strength and blood supply of the bone portion are endangered
Solution Approach 1:
The asymmetric pin design allows a single pin to provide fixation strength comparable to multiple circular pins by preventing rotation and ensuring stable inter-fragmentary fixation. This eliminates the need for multiple pins, thereby preserving bone strength and blood supply.
3Stability of the object's composition
If the pin diameter is large for stable fixation, then rotational stability is improved, but the drilling process becomes more difficult and bone damage increases
Solution Approach 1:
The asymmetric pin cross-section with flat sides or ridges allows for stable fixation with a smaller overall diameter compared to a circular pin of equivalent stability. The asymmetric geometry provides rotational stability through geometric interlocking rather than relying on large diameter friction, thereby reducing drilling difficulty and bone damage.
Data Source
AI summary
An osteosynthesis device that is used, in particular, for securing joint fragments and for the temporary splinting of toes, more particularly for treating hammer toes or other malalignments of toes. The device comprises a pin with the center axis and the length. The pin consists largely of a bioresorbable material. The pin has at least in one section of the length a non-circular cross-section that is orthogonal to the center axis and has a radius of curvature.