Bone Fixation Screw With Transverse Set Screw for Rotational Stability
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Solution Overview
Problem
Existing bone fracture fixation methods using multiple compression screws cause trauma and complicate the insertion procedure due to limited contact area and inability to distribute compression load widely, and lack sufficient resistance to rotation between the femoral head and femur.
Innovation Solution
A bone fixation device with a fixation screw and aiming arm that allows for the insertion of a set screw at a second angle perpendicular to the fixation screw, stabilizing it through a transverse opening, reducing the need for multiple screws and minimizing trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple compression screws are used to secure the fracture, then the resistance to rotation is improved, but the trauma to bone and tissue increases and the insertion procedure becomes more complicated
Solution Approach 1:
The fixation device is divided into separate functional components: a fixation screw for compression and a set screw for rotational stability. This segmentation allows each component to perform its specific function optimally without requiring multiple compression screws, thereby reducing trauma while maintaining rotational resistance
Solution Approach 2:
The patent combines the functions of compression fixation and rotational stabilization into a single integrated device. The fixation screw provides compression while the set screw, engaged with the fixation screw through a transverse opening, provides rotational stability, eliminating the need for multiple separate screws
2Strength
If multiple compression screws are used to secure the fracture, then the resistance to rotation is improved, but the insertion procedure becomes more complicated
Solution Approach 1:
By segmenting the fixation function into two specialized components (fixation screw for compression, set screw for rotation), the device simplifies the insertion procedure. Each screw has a dedicated function, making the insertion process more straightforward compared to inserting multiple compression screws that must all be manually positioned and secured
Solution Approach 2:
The set screw is pre-configured to engage with the fixation screw through a transverse opening, allowing rotational stability to be established as a preliminary action during insertion. This pre-planned engagement sequence simplifies the overall insertion procedure by eliminating the need for complex multi-step fixation
3Object-affected harmful factors
If a single compression screw is used, then the trauma is reduced, but the contact area is limited and cannot distribute compression load widely
Solution Approach 1:
The patent introduces a transverse dimension by adding a set screw that engages with the fixation screw through a transverse opening. This adds a new spatial dimension to the fixation mechanism, allowing load distribution in multiple directions (longitudinal compression from the fixation screw and transverse stabilization from the set screw), thereby increasing the effective contact area without increasing trauma
Data Source
AI summary
A bone fixation device for treatment of a bone fracture includes a fixation screw defining a transverse opening, a fixation arm configured for inserting the fixation screw through a bone fracture, a set screw, and an aiming arm configured for inserting the set screw into the transverse opening and engagement with the fixation screw via a guide sheath extending through the fixation arm. The guide sheath includes a camming feature that locks and unlocks the guide sheath to the fixation arm.