Meniscal Allograft Cutting Guides and Reaming Depth Control
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Solution Overview
Problem
Existing meniscal allograft transplantation techniques face challenges in precise cutting of dovetail shapes and risk overdrilling during tibial bone reaming, which can lead to implant failure and damage to nerves/arteries.
Innovation Solution
A device with adjustable cutting guides and removable slots for precise allograft shaping, and a system with guidewires and hard stops to prevent overdrilling, ensuring accurate implant fit and safe bone preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hand cutting is used for dovetail meniscal allograft, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
A cutting guide system serves as an intermediary between the surgeon and the allograft bone. The guide includes a body with slots that direct cutting tools to create precise dovetail shapes. The guide is positioned against the allograft and provides fixed reference surfaces that ensure accurate cutting angles and depths, transforming the imprecise hand-cutting process into a controlled precision operation.
2Manufacturing precision
If reaming is performed to make room for allograft, then implant fit is improved, but object-affected harmful factors worsen due to risk of overdrilling into nerves and arteries
Solution Approach 1:
Guidewires are inserted into the tibia before reaming to establish the correct trajectory and depth. The guidewires act as preliminary references that prevent the reamer from deviating or penetrating too deeply. By pre-positioning these reference elements, the system ensures that subsequent reaming operations remain within safe boundaries and avoid damage to underlying nerves and arteries.
Solution Approach 2:
The guidewire system serves as an intermediary between the reaming operation and the sensitive neural/vascular structures. The guidewire's fixed length and trajectory act as a physical barrier and guide, preventing the reamer from advancing beyond safe depth limits and protecting underlying structures from iatrogenic damage.
3Device complexity
If existing meniscal guide systems are used, then device complexity is reduced, but measurement precision deteriorates due to inability to detect reamer depth
Solution Approach 1:
The guidewire acts as an intermediary measurement reference. Its predetermined length serves as a physical stop that indicates when the reamer has reached the appropriate depth. This simple yet effective mechanism provides tactile and visual feedback to the surgeon, enabling precise depth control without requiring complex electronic sensors or imaging systems.
Data Source
AI summary
The present disclosure provides a meniscal allograft transplantation system and methods of use.