Cannulated Slotted Reamer for Precise Shoulder Reaming Alignment
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Solution Overview
Problem
Existing arthroplasty procedures face challenges in achieving accurate implant alignment and minimizing soft tissue damage during shoulder joint reaming, particularly due to misalignment and dislocation issues.
Innovation Solution
A reamer with a cannulated central body and cutting legs, featuring a recess and bore for a guide pin, allows for precise alignment and minimizes soft tissue dislocation through a magnetic coupling mechanism, ensuring accurate reaming trajectories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a guide wire is placed in the scapula to determine reaming trajectory, then accurate implant alignment can be achieved, but the shoulder joint must be dislocated which damages surrounding soft tissues
Solution Approach 1:
A magnetic guide pin serves as an intermediary between the reamer and the guide wire trajectory. The guide pin is inserted through the reamer's bore and recess, providing magnetic coupling that eliminates the need for full shoulder dislocation while maintaining accurate trajectory guidance for implant alignment
Solution Approach 2:
The patent replaces the traditional mechanical guide wire insertion method (requiring shoulder dislocation) with a magnetic coupling system. The magnetic guide pin allows the reamer to be positioned and guided along the correct trajectory without mechanical dislocation of the shoulder joint, thereby preserving soft tissues
2Manufacturing precision
If the reamer is designed with a cannulated central body and cutting legs, then precise reaming trajectory can be maintained, but the device complexity increases
Solution Approach 1:
The reamer is segmented into distinct functional components: a cannulated central body portion for structural support and guidance, cutting legs for bone removal, a bore for guide pin insertion, and a recess for magnetic coupling. This segmentation allows each component to perform its specific function efficiently while maintaining overall precision
Solution Approach 2:
The guide pin is nested within the reamer structure, passing through the bore and engaging with the recess. This nested configuration allows the guide pin to be integrated into the reamer assembly during the procedure, providing precise trajectory control without requiring separate guidance devices that would increase complexity
Data Source
AI summary
Described herein are cannulated reamer designs and methods. In one embodiment, a reamer comprises a cannulated central body portion, a plurality of cutting legs and outer frame. The cannulated central body portion has an inner wall surface and an opposing outer wall surface defining a thickness and a bone contacting surface and an opposing distal end surface defining a length, the inner wall surface defining a bore about a central longitudinal axis of the cannulated central body portion. The plurality of cutting legs extends outwardly from the cannulated central body portion. The other defines a periphery of the reamer, the outer frame coupled to a lateral end of each of the plurality of cutting legs. The cannulated central body portion has a recess extending entirely through the thickness and only partially though the length.