Tibial Posterior Slope Alignment Guide with Adjustable Translation
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Solution Overview
Problem
The complexity and cost of existing instrument sets for total knee arthroplasty (TKA) procedures are high due to the need for multiple, complicated tools to achieve precise bone resection and alignment, leading to increased manufacturing, storage, and maintenance costs, as well as limitations in surgeon flexibility.
Innovation Solution
A system comprising an intramedullary jig and resection guide assembly with an anchoring block and anterior/posterior translation member, allowing for adjustable resection guide orientations to achieve desired posterior slopes during tibial resection, reducing the number of components and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple specialized instrument sets are provided for different resection philosophies, then surgeon preference and technique flexibility are accommodated, but device complexity and life-cycle costs increase significantly
Solution Approach 1:
The instrument set is designed to perform multiple resection philosophies and techniques using a single unified system. The system can accommodate different cutting guides and positioning mechanisms that enable mechanical axis alignment, anatomic axis alignment, gap balancing, measured resection, anterior referencing, and posterior referencing techniques, eliminating the need for separate specialized instrument sets for each technique
Solution Approach 2:
The system incorporates adjustable and reconfigurable components that can be dynamically adjusted during the procedure. The cutting guides and positioning elements can be modified to accommodate different surgical approaches and patient anatomies, providing versatility without requiring multiple fixed-purpose instrument sets
2Adaptability or versatility
If multiple specialized instrument sets are provided for different resection philosophies, then different cutting angles and bone removal amounts can be achieved, but manufacturing, storage, and maintenance costs increase
Solution Approach 1:
A single instrument set design serves multiple cutting angle requirements through reconfigurable guides and positioning mechanisms. The system can be adjusted to provide various resection angles and bone removal amounts needed for different surgical techniques, eliminating the need to manufacture multiple specialized instrument sets
Solution Approach 2:
Multiple previously separate instrument functions are merged into a single unified instrument set. The system combines the capabilities of multiple specialized sets into one platform that can perform all necessary cutting operations across different resection philosophies, reducing manufacturing complexity and cost
3Adaptability or versatility
If complicated mechanisms and duplicate instruments are used in instrument sets, then various resection techniques can be supported, but reliability decreases due to more failure-prone components
Solution Approach 1:
The unified instrument set reduces the total number of components and mechanisms required compared to having multiple separate specialized sets. By consolidating functions into a single reliable platform with fewer moving parts and connections, the system maintains versatility while improving overall reliability and reducing failure points
Data Source
AI summary
A resection guide system for resecting an end of bone includes an anchoring block having an elongate shaft and an opening extending through the anchoring block at one end thereof. The opening is sized to receive a rod therein and defines an axis. A translation member includes a housing and a shaft extending therefrom. The housing is engageable to the shaft of the anchoring block in a first configuration in which the shaft of the translation member is oriented at a first angle relative to the axis of the opening and a second configuration in which the shaft of the translation member is oriented at a second angle relative to the axis of the opening. A resection guide assembly connects to the shaft of the translation member and has a resection guide surface adapted to guide a cutting instrument along a plane defined by the resection guide surface.