Bone Staple Extraction Device Force Distribution
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Solution Overview
Problem
Current bone staple removal tools concentrate extraction force at a single point, risking bone breakage and making the removal process difficult and time-consuming due to osseointegration.
Innovation Solution
A bone staple extraction device with a main gripping body and a central rod that slides axially, allowing for the disengagement of the staple from its seat by engaging with the first element and using abutment elements to keep the second element in place, distributing the force evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a curved stainless steel bar with a fulcrum is used to extract the bone staple, then the extraction force can be applied to lift and remove the implant, but the force is concentrated in a single point leading to high risk of bone breakage
Solution Approach 1:
The extraction device divides the force application into multiple points: the central rod engages with the first element (titanium plate) at one location, while multiple abutment elements engage with the second element (PEEK thickness) at different circumferential positions. This segmentation distributes the extraction force across multiple contact points rather than concentrating it at a single fulcrum point, reducing stress concentration on the bone and preventing accidental breakage during the extraction process.
2Reliability
If the implant is left in place for osseointegration, then the ligament is securely fixed to the bone, but the implant becomes difficult to remove requiring significant time and force for revision surgery
Solution Approach 1:
The device extracts the first element (titanium plate) from the bone staple assembly by engaging it with the central rod and applying upward force. By specifically targeting and removing only the first element that is osseointegrated into the bone, the device enables separation of the implant components without requiring excessive force or time, thus facilitating quicker revision surgery while maintaining the reliability of osseointegration during the implant's functional life.
3Object-affected harmful factors
If the central rod engages with the first element and abutment elements engage with the second element, then the force is distributed evenly over the entire staple, but the device structure becomes more complex
Solution Approach 1:
The device merges the functions of force application and force distribution into a single integrated structure. The main gripping body houses both the central rod (for engaging the first element) and the circumferentially arranged abutment elements (for engaging the second element). This merging allows the device to distribute force evenly across multiple points while maintaining a compact, unified structure rather than requiring separate components for each function, thus managing device complexity effectively.
Data Source
AI summary
An extraction system for bone staples provided with a first and a second element, comprising a main gripping body having a distal end and a proximal end. The device comprises, in addition, a central rod provided with a proximal end and a distal end, the latter adapted to couple with the first element of the staple. The central rod slides axially within the main gripping body between a first position and a second position by means of suitable movement means. The device has a plurality of abutment elements protruding in the axial direction from the distal end of the main body, which are arranged circumferentially around the central rod, adapted to act on the second element of the staple to obtain, in cooperation with the movement of the central rod, the separation of the second element of the staple from the first element of the staple and the removal thereof.