Joint Resection Guide Linkage for Six-DOF Implant Alignment
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Solution Overview
Problem
Current arthroplasty procedures face challenges in achieving accurate implant alignment due to the limitations of existing instrumentation, leading to potential misalignment issues that can result in post-surgery pain and reduced functionality.
Innovation Solution
A modular linkage system comprising an anchor, cutting block, and pivotably interconnectable links with frictional connections is used to position a cutting guide, allowing for flexible alignment and resection of bones with six degrees of freedom, ensuring precise implant placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard alignment instrumentation is used for locating resection position and orientation, then the procedure can be completed with conventional tools, but the accuracy of implant alignment is insufficient leading to potential misalignment
Solution Approach 1:
The cutting guide is divided into multiple segments including a base portion, intermediate portion, and cutting block portion that can move relative to each other. This segmentation allows each component to contribute to the overall alignment accuracy while maintaining manageable complexity through modular design.
Solution Approach 2:
The cutting guide incorporates dynamic movement capabilities where the cutting block portion can move along the intermediate portion between locked and unlocked positions. This dynamic feature enables precise positioning and alignment adjustment while maintaining structural integrity during the procedure.
2Adaptability or versatility
If a fixed cutting guide is used for bone resection, then the structure is simple and stable, but the adaptability to different alignment requirements is limited
Solution Approach 1:
The cutting guide transitions from a fixed structure to a dynamic system where the cutting block portion can move along the intermediate portion. This provides adaptability for different alignment requirements while maintaining a relatively simple overall structure through controlled movement rather than multiple complex adjustable components.
Solution Approach 2:
The intermediate portion serves multiple functions: it connects the base to the cutting block, provides a track for movement, and enables alignment adjustment. This multi-functionality increases adaptability without proportionally increasing structural complexity.
3Manufacturing precision
If conventional instrumentation is used for humeral head resection, then the procedure is straightforward, but the precision of resection and subsequent implant placement is compromised
Solution Approach 1:
The cutting guide is segmented into functional portions that can be independently positioned and locked. This segmentation enables precise resection by allowing each component to be optimized for its specific function while maintaining ease of operation through modular assembly and locking mechanisms.
Solution Approach 2:
The cutting guide is positioned and locked onto the humerus before the resection procedure begins. This preliminary positioning ensures that the subsequent resection and implant placement follow the pre-determined precise alignment, improving manufacturing precision without significantly complicating the overall procedure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modular linkage system enhances the accuracy of bone resection procedures, reducing the risk of misalignment and improving the success and functionality of arthroplasty by providing a flexible and precise method for implant alignment.
Implementation Method 1
The connections may have enough friction to prevent, or at least slow, flexure of a linkage of typical length in the absence of active manipulation by the surgeon.
Data Source
AI summary
A resection guide includes an anchor having bone anchoring features, a cutting block having a cutting guide defined therein, and a linkage flexibly connecting the cutting block to the anchor. The flexibility of the linkage provides the cutting block with six degrees of freedom of motion relative to the anchor.