Osteochondral Graft Copy-Mill Apparatus for Precise Defect Fitting
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Solution Overview
Problem
Current treatments for damaged articular cartilage, such as prosthetic devices, fail to replicate the elastic and shock-absorbing properties of natural cartilage and often do not withstand the forces of knee joint function, while osteochondral autograft transplantation requires precise fitting of grafts in openings, which is challenging to achieve.
Innovation Solution
A method and apparatus for preparing a graft using a mold or three-dimensional model to precisely fit the defect, involving the use of a copy-mill apparatus with a grinding bit to shape the graft according to the defect's contour, or employing imaging techniques for creating a three-dimensional model for precise graft formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a prosthetic device is used to replace damaged cartilage, then the structural support is improved, but the elastic and shock-absorbing properties are lost
Solution Approach 1:
The invention changes the physical parameters of the graft preparation process by using a copy-mill apparatus with a grinding bit to precisely control the dimensions, curvature, and surface characteristics of the osteochondral graft. This ensures the graft matches the defect's geometric parameters while maintaining natural cartilage properties including elasticity and shock-absorbing capabilities.
2Adaptability or versatility
If osteochondral autograft transplantation is performed, then the natural cartilage properties are preserved, but the precision of graft fitting in the defect is difficult to achieve
Solution Approach 1:
The invention creates a physical copy or mold of the defect geometry, then uses this copy to guide the preparation of the graft. The copy-mill apparatus uses the defect mold to precisely replicate its contours, ensuring the graft perfectly matches the defect's shape, size, and curvature for optimal fit and integration.
Solution Approach 2:
The invention changes the physical parameters of the graft preparation process by using a copy-mill apparatus with a grinding bit to precisely control the dimensions, curvature, and surface characteristics of the osteochondral graft. This ensures the graft matches the defect's geometric parameters while maintaining natural cartilage properties including elasticity and shock-absorbing capabilities.
3Ease of manufacture
If conventional drilling methods are used to create openings in bone, then the procedure is simple, but the precision and customization of the opening to match the graft is insufficient
Solution Approach 1:
The invention creates a physical copy or mold of the defect geometry, then uses this copy to guide the preparation of the graft. The copy-mill apparatus uses the defect mold to precisely replicate its contours, ensuring the graft perfectly matches the defect's shape, size, and curvature for optimal fit and integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures a precise fit of the graft in the defect, enhancing the durability and functionality of the repair by replicating the natural cartilage's properties and withstanding joint forces, thereby improving the effectiveness of osteochondral autograft transplantation.
Implementation Method 1
a copy-mill apparatus with a grinding bit to shape the graft according to the defect's contour
Data Source
AI summary
A surgical procedure for preparing a graft for insertion in an opening in a human body, according to which a mold is formed in the opening and transferred from the opening to a position adjacent a stylus. A contour of the mold is traced with the stylus; and the tracing movement of the stylus is transferred to corresponding movement of a cutting member so that the cutting member cuts the same contour in the graft.