Osteochondral Chisel Harvest Guide for Bone Geometry Matching
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Solution Overview
Problem
Obtaining a close match between the geometry of osteochondral plugs and recipient sockets in orthopedic surgery is challenging due to the difficulty in achieving a precise fit and curvature match.
Innovation Solution
The use of an osteochondral chisel assembly and harvest guide system, which includes an osteochondral chisel, adapter, impactor, orientation guide, and harvest guide, facilitates the harvesting of osteochondral plugs and creation of recipient sockets by ensuring the cutting device is maintained perpendicular to the bone surface, allowing for precise geometry matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional harvesting methods are used, then the surgical procedure can be performed, but the geometry match between osteochondral plugs and recipient sockets is poor
Solution Approach 1:
The harvesting system is divided into multiple specialized components including a harvest guide for positioning, an osteochondral chisel for cutting, and a trephine for circular harvesting. Each component performs a specific function to achieve precise geometry matching between plugs and sockets.
Solution Approach 2:
The harvest guide acts as an intermediary device that maintains the cutting tool perpendicular to the bone surface and positions it accurately. This intermediary component enables precise geometry matching without requiring the surgeon to manually achieve such precision.
2Manufacturing precision
If manual cutting methods are used, then the procedure is simpler, but the curvature match between plug and bone surface is inconsistent
Solution Approach 1:
The harvest guide is positioned and secured on the bone surface before the cutting operation begins. This preliminary positioning establishes the correct orientation and perpendicularity, ensuring consistent curvature match throughout the harvesting process without requiring complex manual adjustments during cutting.
Solution Approach 2:
The system replaces manual freehand cutting with a guided mechanical cutting process. The harvest guide provides mechanical constraints that ensure the cutting tool maintains the correct angle and position, substituting manual skill with mechanical precision.
3Manufacturing precision
If precise geometry matching is achieved, then the fit between plug and socket is improved, but the time required for harvesting increases
Solution Approach 1:
The harvesting process is segmented into distinct steps, each handled by a specialized tool. The harvest guide handles positioning and orientation, while the osteochondral chisel or trephine handles cutting. This segmentation allows each component to be optimized for its specific function, achieving precision efficiently.
Solution Approach 2:
The harvest guide is designed to self-position on the bone surface using its base, automatically establishing the correct orientation without requiring additional measurement or adjustment steps. This self-positioning capability reduces the time required to achieve precise geometry matching.
Data Source
AI summary
A method is disclosed and can include engaging a harvest guide with bony tissue and placing a cutting device within the harvest guide. The harvest guide can maintain the cutting device substantially perpendicular to a tangent through a point on the bony tissue aligned with the cutting device. The cutting device can be an osteochondral chisel, a trephine, or a combination thereof.