Drill Guide Assembly With Tooth-Gripped Metacarpal Trajectory Control
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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 trigger end with a locking mechanism, a distal ring with a spike and hook, and a rotatable drill bullet with arms and teeth to stabilize the first metacarpal, ensuring precise alignment and trajectory control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a drill guide is used to maintain proper trajectory, then drilling accuracy is improved, but the device complexity increases due to the need for additional stabilization components
Solution Approach 1:
The drill guide is divided into separate functional components: a guide body for trajectory control, a guide rail for positioning, and a drill bullet with arms for stabilization. This segmentation allows each component to perform its specific function effectively while maintaining overall system manageability.
Solution Approach 2:
The drill bullet acts as an intermediary device between the guide body and the first metacarpal bone. It provides a mechanical interface that stabilizes the loose bone during drilling, enabling accurate trajectory maintenance without requiring direct complex fixation of the bone to the guide.
2Measurement precision
If the first metacarpal is stabilized during drilling, then drilling trajectory control is improved, but the ease of operation deteriorates due to the need for additional stabilization steps
Solution Approach 1:
The drill bullet with its arms is pre-configured to engage with the first metacarpal before drilling begins. The arms are designed to automatically stabilize the bone when the drill guide is positioned, eliminating the need for separate stabilization steps and simplifying the overall operation.
Solution Approach 2:
The drill bullet's arms self-adjust to contact and stabilize the first metacarpal bone automatically when the guide rail is positioned correctly. This self-stabilizing mechanism reduces the need for manual adjustment and additional stabilization steps by the surgeon.
3Measurement precision
If a locking mechanism is added to control guide body movement, then positioning precision is improved, but the device complexity increases
Solution Approach 1:
A simple locking mechanism acts as an intermediary between the guide body and the guide rail, providing positioning control without requiring complex fixation systems. The lock engages with the guide rail's features to secure the guide body at the desired position.
Solution Approach 2:
The locking mechanism is designed to be self-actuating or easily operable, allowing the surgeon to lock the guide body position with a single action. The mechanism self-maintains the locked position without requiring additional components or complex procedures.
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.