Metacarpal Drill Guide Assembly for Stable CMC Drill Trajectory
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Solution Overview
Problem
Drilling through the first metacarpal during CMC suspension procedures is challenging due to the loose nature of the first metacarpal after trapezium removal, making it difficult to maintain the proper trajectory of the drill bit.
Innovation Solution
A drill guide with a guide rail and guide body featuring a locking mechanism, a trigger end, and a drilling end with a rotatable drill bullet, along with a spike and hook for stabilizing the first metacarpal, allowing precise control over the drill trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the first metacarpal is allowed to move freely after trapezium removal, then the surgical procedure can proceed without additional stabilization steps, but the drill trajectory cannot be maintained accurately
Solution Approach 1:
The drill guide assembly acts as an intermediary device between the surgeon and the loose first metacarpal bone. The guide body with drilling aperture provides a stable reference frame that mediates the drilling action, allowing the surgeon to drill accurately without directly manipulating or stabilizing the loose metacarpal bone.
Solution Approach 2:
The patent replaces manual bone stabilization techniques with a mechanical guide system. The guide rail and guide body create a fixed mechanical pathway that substitutes for the need to manually hold or stabilize the loose metacarpal bone during drilling.
2Device complexity
If a traditional drill guide is used without stabilization features, then the device structure remains simple, but the loose first metacarpal cannot be controlled during drilling
Solution Approach 1:
The drill guide is segmented into distinct functional components: a guide body with drilling aperture, a guide rail with elongated shaft, and stabilization features (spike and hook). This segmentation allows each component to perform its specific function while keeping the overall device relatively simple.
Solution Approach 2:
The guide body is designed to be movable along the guide rail, allowing dynamic adjustment and positioning. The locking mechanism enables the guide body to transition between locked and unlocked positions, providing flexibility in operation while maintaining stability during drilling.
3Manufacturing precision
If manual locking steps are added to stabilize the first metacarpal, then the bone position can be controlled, but the drilling process requires additional time and steps
Solution Approach 1:
The guide rail and guide body are pre-positioned and locked together before the drilling operation begins. The stabilization features (spike and hook) are already in place to secure the first metacarpal, eliminating the need for additional manual locking steps during the actual drilling process.
Solution Approach 2:
The patent combines multiple functions into a single integrated drill guide assembly: trajectory guidance, bone stabilization, and positioning are all merged into one device that works simultaneously, rather than requiring separate steps for each function.
Data Source
AI summary
A drill guide for controlling the first metacarpal while maintaining the proper trajectory of the drill. The drill guide includes a guide rail having an elongated shaft and a guide body with an aperture extending therethrough. The aperture is configured to receive the elongated shaft of the guide rail. The drill guide also includes a distal ring connected to the elongated shaft. A spike and a hook are both attached to the distal ring and extend therefrom. The hook and the spike extend from opposing positions along the distal ring. A trigger end of the guide body has a trigger that, when actuated, allows the guide body to slide along the guide rail in a proximal direction. A drilling end of the guide body has a rotatable drill bullet extending distally therefrom. The drill bullet includes a pair of arms lined with teeth for engaging the first metacarpal.