Ankle Prosthesis Center-Transfer Instrument
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Solution Overview
Problem
Current methods for performing total ankle arthroplasty procedures lack efficient tools for accurately transferring the tibial component's center location to the talus, leading to challenges in precise implantation of ankle prostheses.
Innovation Solution
An orthopedic surgical instrument featuring a center-transfer instrument with levers and an indenting spike is used to create an indentation on the talus, allowing for precise alignment and implantation of the tibial trial component, followed by modular cutting blocks for preparing the talus surface to receive the talar component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional surgical methods are used for total ankle arthroplasty, then the procedure can be performed, but accurate transfer of the tibial component's center location to the talus is difficult to achieve
Solution Approach 1:
The surgical instrument is divided into separate functional components: a lever mechanism for transferring the center location, an indenting spike for marking the talus, and a tibial trial component for positioning. This segmentation allows each component to perform its specific function accurately while maintaining overall system simplicity.
Solution Approach 2:
The lever acts as an intermediary mechanism that connects the tibial trial component to the talus. By moving the lever, the surgeon can transfer the center location from the tibia to the talus through a mechanical linkage, achieving accurate transfer without direct measurement tools.
2Manufacturing precision
If precise indentation is made on the talus surface, then accurate alignment for implantation is achieved, but the instrument requires complex lever mechanisms
Solution Approach 1:
The lever mechanism combines multiple functions into a single integrated tool: it positions the tibial trial component, transfers the center location to the talus, and delivers the indenting spike all through one mechanical motion. This merging reduces the need for multiple separate instruments while maintaining precision.
Solution Approach 2:
The lever mechanism provides dynamic adjustment during the surgical procedure. The surgeon can move the lever to different positions to accommodate varying anatomical conditions, and the indenting spike can be activated at the precise moment needed, providing adaptability without compromising precision.
Data Source
AI summary
Instruments for use in implanting an orthopedic ankle prosthesis includes a center-transfer instrument and a number of bone cutting blocks. A method of using such instruments is also disclosed.