Adjustable Patella Resection Guide for Precision Bone Cutting
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Solution Overview
Problem
Current patella resection methods in orthopaedic surgery lack precision and consistency due to the use of generic surgical instruments, leading to potential inaccuracies and insufficient bone stock retention, especially with varying patella sizes.
Innovation Solution
An adjustable patella resection guide with a handle, slide member, and claw members that securely grip the patella, allowing for precise resection by adjusting the opening size to accommodate different patella sizes through linear or pivotal movement, ensuring proper positioning and bone retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a generic surgical instrument is used for patella resection, then the device complexity is reduced and ease of manufacture is improved, but the manufacturing precision and measurement precision deteriorate due to inability to accommodate varying patella sizes
Solution Approach 1:
The resection guide incorporates a slide member that can move along the longitudinal axis of the handle, allowing dynamic adjustment of the opening size to match different patella dimensions. This dynamic mechanism enables a single generic device to achieve precise resection accuracy across various patient sizes without requiring multiple specialized instruments.
Solution Approach 2:
The guide allows changing the geometric parameter of the opening size by adjusting the slide member position. By varying the opening dimension parameter, the same device can accommodate different patella sizes while maintaining manufacturing precision, resolving the contradiction between generic design and size-specific precision.
2Manufacturing precision
If multiple sized resection guides are provided to accommodate varying patella sizes, then the manufacturing precision is improved, but the device complexity and inventory requirements increase
Solution Approach 1:
The resection guide is designed as a universal instrument with an adjustable opening mechanism that can accommodate multiple patella sizes using a single device. The slide member allows one device to perform the function of multiple sized guides, eliminating the need for maintaining separate instruments for different size categories.
Solution Approach 2:
Instead of having static multiple sized guides, the invention uses a dynamic adjustable mechanism where the opening size can be changed during the surgical procedure. This dynamic capability replaces the need for multiple static sized devices, reducing device complexity while maintaining precision.
3Ease of operation
If free-hand cutting is used for patella resection, then the ease of operation is improved, but the manufacturing precision and measurement precision deteriorate due to lack of guidance
Solution Approach 1:
The resection guide acts as an intermediary tool between the surgeon and the patella. It provides physical guidance and constraints that translate the surgeon's manual operations into precise resection cuts, bridging the gap between ease of manual operation and surgical precision without requiring complex automated systems.
Solution Approach 2:
The invention replaces unguided manual mechanical cutting with guided mechanical cutting through the resection guide structure. The guide's physical constraints and opening geometry substitute for complex control systems, providing precision through simple mechanical guidance rather than automated control.
4Device complexity
If the opening size in the resection guide is fixed, then the device complexity is reduced, but the adaptability deteriorates due to inability to accommodate different patella sizes
Solution Approach 1:
The slide member enables the opening size to change dynamically based on the patient's patella dimensions. This dynamic adjustment capability provides adaptability to various sizes while maintaining relatively simple device architecture, avoiding the need for complex interchangeable components or multiple fixed-size devices.
Solution Approach 2:
The guide allows changing the opening dimension parameter through slide member adjustment. This parameter variability enables the same device structure to adapt to different patella sizes, achieving versatility without requiring fundamentally different device designs for each size category.
Data Source
AI summary
A patella resection assembly comprises a handle, slide member and two claw members. The slide member is movably mounted on the handle and includes two diverging arms. Inner edges of the diverging arms contact outer edges of the claw members so that distal movement of the slide member causes the claw members to move toward each other and close around a patella. The claw members and slide member have teeth for grasping the patella as the claw members move together. The claw members also have flat co-planar surfaces for guiding the path of a saw blade during resection of the patella.