Bone Cutting Box for Secure, Precise Graft Shaping
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Solution Overview
Problem
The challenge in fresh osteochondral allograft transplantation is achieving precise matching of donor bone size and orientation to the recipient, while ensuring the graft's integrity and preventing loss during surgical preparation, which is critical due to their rarity and high cost.
Innovation Solution
A bone holding and cutting system with a cutting box and holding plate, featuring adjustable positioning and secure fixation via screws and pins, allowing fine adjustments and containment during cutting to ensure precise cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bone graft is held securely during cutting, then cutting precision and graft containment are improved, but device complexity increases
Solution Approach 1:
The cutting box is divided into multiple functional components: a base with cutting slots, a holding plate with apertures for securing the graft, an adjustable positioning element for alignment, and a top cover for containment. This segmentation allows each component to perform its specific function while maintaining overall system manageability and cutting precision.
2Measurement precision
If the graft holding plate includes multiple adjustment mechanisms, then positioning accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The holding plate incorporates an adjustable positioning element that can be dynamically repositioned along the cutting slots to achieve precise alignment. The adjustable nature allows the device to adapt to different graft sizes and cutting requirements while maintaining ease of operation through simple linear adjustment along predefined slots.
3Reliability
If the cutting box includes containment features, then graft loss prevention is improved, but device complexity increases
Solution Approach 1:
The cutting box integrates multiple functions into a single unified structure: the base provides cutting slots and apertures for graft securing, the holding plate combines positioning and fixation features, and the top cover merges containment with structural support. This merging reduces the need for separate devices while ensuring graft containment and loss prevention.
Data Source
AI summary
A bone cutting apparatus for holding a bone graft for shaping and sizing during surgery, including a polygonal cutting box having two opposing sides, at least one open side, and a base. The opposing sides have cutting slots, and a cutting accessory attaches to one of the opposing sides and has a central cutting slot that aligns with and expands the size of a cutting slot to pass a saw blade. A graft holding plate includes a platform with an upper surface to support a bone graft and further includes an underside with a pedestal configured to secure the holding plate to the base of the cutting box. The platform has a plurality of openings for passing screws into the bone graft. A top is placed on the opposing sides and includes downwardly oriented fenestration extensions configured for placement in the open sides and completes the enclosure for cutting.