Reamer Guide System for Accurate Bone Countersink Formation
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Solution Overview
Problem
During arthrodesis procedures, the elastic movement of bones during milling can lead to inaccurately milled countersinks and difficulty in finding the proper location for fusion plate implantation due to the lack of guides or aids in current methods.
Innovation Solution
A reamer guide system with a guide base and positioning aid that includes temporary fixation elements and a locating bore to securely position and align the reamer for accurate countersink formation in multiple bones, preventing bone separation and ensuring precise placement of the fusion plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reamer is pushed towards bones to mill countersinks, then the countersink is formed in the bones, but the bones elastically move apart from each other leading to inaccurate countersink formation
Solution Approach 1:
A reamer guide is introduced as an intermediary device between the reamer and the bones. The guide includes a guide base positioned adjacent to the bones and a guide aperture that directs the reamer towards the bones, preventing direct contact and elastic movement while ensuring accurate countersink formation.
Solution Approach 2:
The guide base is positioned adjacent to the bones before the reaming operation begins. This preliminary positioning establishes a stable reference frame and guides the reamer along a predetermined path, preventing bone displacement during the subsequent reaming process.
2Ease of operation
If free hand milling is used to create countersinks, then the procedure is simple, but it is difficult to find the proper location for fusion plate implantation
Solution Approach 1:
The reamer guide serves as a mediator that provides visual and physical guidance for locating the proper position for countersink formation. The guide base and guide aperture clearly indicate the target location, making it easier to achieve accurate positioning without complex measurement procedures.
3Stability of the object's composition
If temporary fixation elements are used to hold bones together, then bone separation is prevented, but the device complexity increases
Solution Approach 1:
The reamer guide is segmented into distinct functional components: a guide base for positioning, a guide aperture for directing the reamer, and integrated bores for receiving temporary fixation elements. This segmentation allows each component to perform its specific function while maintaining overall system coherence and preventing bone separation.
Data Source
AI summary
A reamer guide system may include a reamer guide that is configured to guide a reamer to at least two bones that are to be reamed to form a countersink. The reamer guide may be configured to temporarily couple to the at least two bones that are to be reamed so as to prevent substantial separation of the at least two bones during the reaming. The reamer guide system may further include a positioning aid that is configured to receive a locating element. The locating element is configured to temporarily couple to a target location adjacent the bones that are to be reamed. The reamer is configured to receive the locating element and advance along the locating element to the target location.