Rotatable Guiding Tool for Abnormal Tibia Alignment
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Solution Overview
Problem
Conventional guiding tools struggle with accurately positioning bone cuts during joint replacement procedures, particularly in cases of abnormal tibia anatomy, leading to suboptimal force transmission and alignment challenges.
Innovation Solution
A guiding tool with a rotatable cutting guide surface and a referencing member that can be aligned with the fibula, allowing for precise angular adjustment to ensure the cutting guide surface is perpendicular to the fibula, rather than the tibia, facilitating correct resection and improved force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional guide tools align with the long axis of the tibia, then the guide surface is perpendicular to the tibial long axis, but this approach fails when the tibia is bowed or abnormal, resulting in inaccurate resection and poor force transmission
Solution Approach 1:
The patent introduces a referencing rod as an intermediary element that can be aligned with alternative anatomical landmarks (fibula, distal tibia axis) instead of directly relying on the tibial long axis. This intermediary allows the guide surface to be positioned accurately even when the primary reference (tibia) is abnormal or bowed
Solution Approach 2:
The patent changes the reference parameter from the tibial long axis to alternative parameters such as the fibula axis or distal tibia axis. By adjusting which anatomical feature serves as the reference, the system can adapt to various pathological conditions while maintaining resection accuracy
2Ease of operation
If the guide surface is fixed perpendicular to the tibial long axis, then the alignment is simple, but it cannot accommodate cases where fibula alignment would provide better force transmission
Solution Approach 1:
The patent makes the guide surface dynamic by allowing rotation relative to the tool body through an adjustment mechanism. This enables the guide surface orientation to be changed from a fixed perpendicular-to-tibia configuration to alternative orientations (such as perpendicular-to-fibula) based on surgical requirements, while maintaining ease of adjustment through the provided mechanism
3Adaptability or versatility
If a rotatable alignment member with adjustment means is added to allow flexible positioning, then adaptability to abnormal anatomy is improved, but the device complexity increases
Solution Approach 1:
The patent divides the guiding tool into separate functional components: a tool body for fixation, a rotatable alignment member for positioning, and an adjustment mechanism for controlling rotation. This segmentation allows each component to perform its specific function independently, making the overall system more manageable despite the added complexity
Solution Approach 2:
The patent extracts the rotational adjustment capability as a separate, dedicated mechanism rather than integrating it into the basic guide structure. This allows the adjustment function to be added without fundamentally redesigning the entire tool, isolating the complexity to a specific subsystem that can be independently understood and operated
Data Source
AI summary
A guiding tool (2) is disclosed comprising a tool body (4) that defines a reference plane of the tool (2); an alignment member (10) that carries a guide surface (74); and an adjustment means acting between the tool body (4) and the alignment member (10) to direct rotational adjustment of the alignment member (10) with respect to the tool body (4).