Rotatable Tooth Clamping Guide for Patella Resection
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Solution Overview
Problem
Existing patellar saw guides lack the ability to securely clamp and adjust to variously shaped patellae, leading to inadequate bone resection and potential instability during the preparation of the patella for prosthetic implantation.
Innovation Solution
A clamping system with rotatable teeth that automatically adjust to the anatomy of the patella, providing a secure hold by aligning teeth with the patella edge surface and limiting rotation to prevent disengagement, combined with a handle mechanism for parallel movement of clamping arms to guide an oscillating saw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional patellar saw guide with fixed clamping jaws is used, then the device structure is simple, but it cannot securely clamp and adjust to variously shaped patellae
Solution Approach 1:
The clamping jaws are made rotatable with teeth that can automatically adjust their orientation to engage with the patella edge surface. This dynamic adjustment capability allows the device to adapt to variously shaped patellae while maintaining a relatively simple overall structure.
Solution Approach 2:
The rotatable teeth on the clamping jaws automatically adjust their position and orientation when brought into contact with the patella edge surface, eliminating the need for manual adjustment by the surgeon. The device self-adjusts to match the patella geometry.
2Reliability
If the clamping teeth are made rotatable to automatically adjust to patella anatomy, then the clamping security is improved, but the device complexity increases
Solution Approach 1:
The clamping jaws incorporate rotatable elements with teeth that can dynamically adjust their orientation to optimally engage the patella edge surface, significantly improving clamping security and reliability.
Solution Approach 2:
The rotatable teeth automatically find their optimal engagement position with the patella anatomy without requiring manual intervention, achieving self-adjustment that enhances reliability while keeping the adjustment mechanism relatively simple.
3Manufacturing precision
If rotatable teeth are used to align with patella edge surface, then precise resection is achieved, but the device complexity increases
Solution Approach 1:
The rotatable teeth on the clamping jaws can dynamically orient themselves to align with the patella edge surface, ensuring precise resection positioning. This dynamic alignment capability achieves manufacturing precision while the rotational mechanism remains relatively simple.
Solution Approach 2:
The teeth automatically align themselves with the patella edge surface through rotation, achieving precise resection positioning without requiring complex adjustment mechanisms or manual calibration.
4Manufacturing precision
If the clamping arms are designed for parallel movement, then the saw guidance is improved, but the device complexity increases
Solution Approach 1:
The clamping arms are designed to move parallel to each other during the clamping process, providing precise guidance for the saw blade. This parallel movement mechanism ensures consistent cutting depth and positioning while maintaining a relatively simple mechanical structure.
Data Source
AI summary
A patella clamping device has a handle having a first arm and a second arm, the arms each having a first gripping end and a second clamping end. The clamping ends are movable towards the opposite arm by action on the gripping end of each arm. The clamping ends of the first and second arms comprise opposed clamping surfaces. The clamping end of each arm has a body portion having spaced first and second surface defining the opposed surface of each arm. A plurality of pins extend from the first to the second surface. A rotatable toothed jaw member is pivotally mounted on each of the pins. The jaw member has at least one tooth extending outwardly of the opposed surface of each arm for engaging the patella. Each body has a third surface spaced from the second surface to create a slot for receiving a saw blade.