Guide Pin Piercing Jig for Rectangular Bone Tunnel Formation
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Solution Overview
Problem
Existing guide pin piercing jigs struggle to accurately determine the position and direction of bone tunnels in the shinbone top portion of the knee joint for ACL reconstruction, especially when no reference bone tunnel is bored, and fail to form tunnels with rectangular or elliptical openings suitable for tendon transplantation.
Innovation Solution
A guide pin piercing jig with a frame and cylinder unit, featuring a positioning projection, parallel guide pin insertion cylinders, and a tentative fixing unit, allowing for the precise placement of guide pins to form parallel bone tunnels that can be connected to create a tunnel with a rectangular or elliptical opening suitable for tendon transplantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single guide pin is used to determine the position and direction of a bone tunnel, then the operation is simple, but the resulting tunnel has only a circular opening which is not suitable for stable tendon transplantation
Solution Approach 1:
The guide pin is segmented into multiple parallel guide pins (first guide pin and second guide pin) that are inserted at different positions. This segmentation allows the formation of multiple bone tunnels that can be connected to create a rectangular or elliptical opening, thereby improving the shape precision for tendon transplantation while maintaining operational simplicity through the integrated jig structure.
Solution Approach 2:
The jig serves as an intermediary device that holds multiple guide pins in precise parallel arrangement. This intermediary structure enables the transformation from simple circular openings (single guide pin) to rectangular/elliptical openings (multiple connected tunnels) without complicating the actual insertion operation, as the jig pre-establishes the correct geometry.
2Measurement precision
If a reference bone tunnel is bored to determine the position of the second bone tunnel, then the position can be accurately determined, but the method cannot be applied when no reference tunnel exists
Solution Approach 1:
The jig pre-establishes the correct positional relationship between multiple guide pins before insertion. This preliminary configuration allows accurate position determination for the second bone tunnel without requiring a reference tunnel to be bored first, thereby improving adaptability to cases where no reference tunnel exists while maintaining measurement precision.
3Manufacturing precision
If multiple parallel guide pins are inserted to form parallel bone tunnels, then a rectangular or elliptical opening can be created, but the device complexity increases
Solution Approach 1:
Multiple guide pins and their holding structures are merged into a single integrated jig assembly. This combining approach allows the formation of rectangular/elliptical openings through multiple parallel tunnels while avoiding the complexity of separate insertion procedures, as the jig provides a unified structure that simplifies the overall operation despite the increased structural integration.
Data Source
AI summary
A guide pin piercing jig includes a cylinder unit and a frame having a positioning projection at a tip thereof, in which the cylinder unit has plural parallel guide pin insertion cylinders and tentative fixing unit and is attached to the frame slidably so as to be directed to the tip of the frame. It becomes possible to pierce living body bone with plural guide pins for hollow drills to a proper portion of a living body bone in a proper direction with parallel arrangement to form a bone tunnel that has a rectangular or elliptical opening and is suitable for tendon transplantation.