Bone Fragment Fixation Device with Sliding Compression Mechanism
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Solution Overview
Problem
Current bone fracture fixation methods using single nails or screws are insufficient to counteract rotational forces, leading to potential redislocation and impaired healing due to shifting of fixation means.
Innovation Solution
A device with multiple fixation means, each comprising a first fixing portion for the inner bone fragment, a second fixing portion secured to an outer bone fragment via a securing plate, and a middle portion allowing sliding compression between bone fragments to absorb rotational forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single nail or screw fixation is used, then the device complexity is low, but the reliability is insufficient to counteract rotational forces
Solution Approach 1:
The fixation device is divided into multiple independent fixation means (at least two), each capable of independent insertion and fixation. This segmentation allows each component to bear specific loads while collectively providing enhanced stability against rotational forces, resolving the contradiction between reliability and complexity by distributing the fixation function across multiple simpler elements.
Solution Approach 2:
The invention combines multiple fixation means with a common securing plate that secures all fixation means simultaneously. This merging creates a unified fixation system where the collective arrangement of multiple nails or screws working together provides superior resistance to rotational forces compared to a single fixation element, achieving higher reliability while maintaining reasonable structural complexity.
2Reliability
If fixation means are rigidly fixed to prevent rotation, then the reliability improves, but the bone fragments cannot compress which affects healing
Solution Approach 1:
The middle portion of the fixation means is designed to allow controlled movement and compression of the outer bone fragment relative to the inner bone fragment. This dynamic design enables the fixation device to adapt during the healing process by permitting necessary compression movements while maintaining overall stability, thus resolving the contradiction between fixation reliability and compression adaptability.
3Adaptability or versatility
If fixation means are allowed to move to absorb rotational forces, then the adaptability improves, but the fixation stability deteriorates
Solution Approach 1:
Different portions of the fixation means have different functional properties: the first fixing portion is rigidly fixed to the inner bone fragment for stable anchoring, the second fixing portion is secured to the outer bone fragment allowing controlled movement, and the middle portion enables compression. This local differentiation of rigidity and flexibility allows the device to simultaneously maintain angular stability while absorbing rotational forces through controlled movement in specific regions.
Data Source
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AI summary
The present invention relates to a device for fixation of bone fragments at bone fractures The device comprises at least two fixation means (1), a securing plate (17), and a securing means for the respective fixation means With a view to achieving a stable rigid connection between fixation means (1) and the securing plate (17) and configuring the device in such a way that the fixation means are not allowed to change their angular position relative to the securing plate and relative to one another, each fixation means (1) has a first fixing portion (9) for fixing the fixation means in an inner bone fragment (3), a second fixing portion for locking the fixation means, which involves using the securing means, to the securing plate (17) which is disposed on the outside of an outer bone fragment (2) and allows movement of the outer bone fragment relative to it, so that the fixation means are prevented from changing their angular position relative to the securing plate and relative to one another, and a middle portion (32) which is situated between the fixing portions and runs through the outer bone fragment, along which middle portion the outer bone fragment can slide inwards towards the inner bone fragment in which the fixation means is fixed