Reamer Guide for Reverse Shoulder Revision
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Solution Overview
Problem
There is a need for surgical instruments and methods that can effectively convert a reverse shoulder prosthesis to an anatomic configuration, particularly during revision procedures or when insufficient bone stock is encountered, as existing tools lack the necessary precision and adaptability for reaming around implanted epiphysis components.
Innovation Solution
A surgical instrument kit comprising a reaming guide with first and second reamer support features, allowing for precise reaming around the epiphysis component, with diverging reaming axes and a reamer that can be fixed in a spatial relationship with the guide to ream bone in concentric rings, facilitating the conversion of a reverse shoulder prosthesis to an anatomic configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a reverse shoulder prosthesis is implanted, then the center of rotation is shifted medially to improve mechanical advantage for deltoid muscle manipulation, but this prevents the use of standard reaming instruments for conversion to anatomic configuration
Solution Approach 1:
The patent introduces a specialized reaming guide as an intermediary device that couples to the implanted epiphysis component. This guide provides adapter features that interface with reamers, enabling the reaming process around the reverse prosthesis while maintaining the medial shift of the center of rotation. The guide acts as a mediator between the reverse prosthesis geometry and the reaming operation.
2Manufacturing precision
If standard reaming instruments are used around an implanted epiphysis component, then the reaming process cannot be performed with sufficient precision, but custom instruments increase device complexity
Solution Approach 1:
The reaming guide is divided into distinct functional segments: a guide body that couples to the epiphysis component, adapter features that interface with reamers, and alignment elements. This segmentation allows each component to perform its specific function while maintaining overall precision, and enables modular assembly that reduces the complexity of any single component.
Solution Approach 2:
The reaming guide incorporates multiple adapter features that can accommodate different reamer types and sizes. The guide body can couple to various epiphysis component geometries, making the instrument versatile for different surgical scenarios while maintaining precise reaming capability through standardized interface features.
3Ease of operation
If reaming is performed around the epiphysis component without a guide, then the procedure is simpler, but the reaming accuracy and bone preparation quality are insufficient for successful conversion
Solution Approach 1:
The reaming guide serves as an intermediary tool that simplifies the surgical procedure by providing a standardized interface between the epiphysis component and reamers. Rather than requiring complex manual positioning and alignment, the guide mechanically ensures accurate reaming paths, making the procedure easier to perform while maintaining high precision.
Data Source
AI summary
An instrument kit is provided for reaming bone around a head of a bone, the bone including an implanted epiphysis component. The instrument kit includes a reaming guide and a reamer. The reaming guide is couplable to the epiphysis component and has a first reamer support feature and a second reamer support feature. The reamer is couplable to one of the first reamer support feature and the second support feature to ream bone around the epiphysis component.