Patella Cutting Guide With Independent Angle and Height Adjustment
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Solution Overview
Problem
Existing patella preparation instruments require cumbersome and inaccurate adjustments of cutting angles and fixation to the patella, necessitating repeated repositioning during surgery, which complicates the surgical process.
Innovation Solution
A patella preparation system with a fixing unit, a movable cutting template, and an actuation mechanism allowing separate adjustments of cutting height and angle without removing the instrument from the patella, utilizing a clamping device that secures the system via the quadriceps and patella tendons for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cutting angle is adjusted by repositioning the entire patella preparation instrument, then the cutting angle can be changed, but the surgical process becomes complicated and time-consuming
Solution Approach 1:
The instrument is divided into separate functional modules: a fixing unit that remains attached to the patella and a cutting template that can be independently adjusted. This segmentation allows the cutting angle to be modified without repositioning the entire instrument, as only the cutting template needs adjustment while the fixing unit maintains stable attachment.
Solution Approach 2:
The cutting template is designed with dynamic adjustment capabilities, allowing it to be repositioned and reoriented independently relative to the fixed fixing unit. This dynamic component enables flexible cutting angle changes while the static fixing unit maintains stable attachment to the patella throughout the procedure.
2Manufacturing precision
If the patella preparation instrument is repeatedly removed and repositioned to adjust cutting parameters, then angle and height adjustments can be made, but surgical efficiency decreases and accuracy is compromised
Solution Approach 1:
The fixing unit is attached to the patella in advance and maintains stable fixation throughout the procedure. This preliminary action establishes a reliable reference frame that eliminates the need for repeated instrument removal and repositioning, thereby maintaining both cutting precision and surgical efficiency.
Solution Approach 2:
The fixing unit and cutting template are combined into a single integrated system where the cutting template can be adjusted independently while remaining connected to the fixed unit. This merging allows continuous adjustment of cutting parameters without breaking the connection to the patella, preserving both accuracy and efficiency.
3Device complexity
If a simple clamping mechanism is used to fix the patella, then the device structure remains simple, but the risk of instrument slippage increases
Solution Approach 1:
The clamping mechanism incorporates localized features such as friction surfaces and geometric interlocking elements at specific contact points with the patella. These local quality enhancements provide high friction and mechanical interlocking that prevent slippage, while the overall structure remains relatively simple and easy to operate.
Data Source
AI summary
A patella preparation system and method of using a patella preparation system. The patella preparation system includes a fixing device adapted to fixedly hold a patella, a guiding device linked to the fixing device to be moveable relative to the fixing device, preferably by translatory and/or tilting movements/motions, and an operation device for manually moving the guiding device relative to the fixing device individually and separately in a translatory and a tilting manner.