Knee Replacement Guide Device for Simultaneous Rotation and Gap Measurement
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Solution Overview
Problem
Conventional knee replacement surgery and revision surgery face challenges in simultaneously identifying the degree of external rotation of the femur and the distance between cut surfaces of the tibia and femur, leading to complex processes and prolonged operation times due to the need for multiple guide devices.
Innovation Solution
A guide device that slides upward and downward to identify the gap between the cut surfaces of the proximal tibia and distal femur, and forward and backward to determine the external rotation of the femur, allowing for precise alignment and reduced operation time using a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple guide devices are used to identify external rotation and gap distance separately, then measurement precision is improved, but device complexity and operation time increase
Solution Approach 1:
The patent combines multiple guide devices into a single integrated guide device that can simultaneously identify both the external rotation degree of the femur and the gap distance between cut surfaces. The guide device includes a first guide portion for external rotation identification and a second guide portion for gap distance measurement, merging functions that previously required separate devices.
Solution Approach 2:
The guide device is designed with multi-functionality to perform multiple measurement tasks during knee replacement surgery. It can identify the external rotation angle of the femur relative to the tibia, measure the gap distance between cut surfaces, and provide alignment guidance, replacing the need for multiple specialized guide devices.
2Measurement precision
If multiple guide devices are used to identify external rotation and gap distance separately, then measurement precision is improved, but operation time increases
Solution Approach 1:
The guide device merges the functions of external rotation identification and gap distance measurement into a single device that can perform both measurements simultaneously during one positioning operation, eliminating the time required to switch between multiple guide devices.
Solution Approach 2:
The guide device is pre-configured with reference lines, reference surfaces, and measurement markings that allow surgeons to perform both external rotation and gap distance measurements in a single setup operation, rather than requiring sequential measurements with multiple devices.
3Ease of manufacture
If conventional separate guide devices are used, then ease of manufacture is maintained, but productivity decreases
Solution Approach 1:
The guide device is segmented into distinct functional portions: a first guide portion for external rotation identification with its reference lines and markings, and a second guide portion for gap distance measurement with its reference surfaces and measurement markings. This segmentation allows each portion to be manufactured independently using conventional techniques while maintaining overall productivity benefits.
Solution Approach 2:
While maintaining the manufacturability of individual components through segmentation, the patent merges these separate guide portions into a single integrated device structure that provides improved surgical efficiency by eliminating the need for multiple separate devices during the procedure.
Data Source
AI summary
A guide device for knee replacement is configured such that during knee replacement surgery and/or knee replacement revision surgery for implanting a prosthetic knee implant, a degree of external rotation of a femur is identified and aligned through a cut surface of a proximal tibia, then a distance of a gap between the cut surface of the proximal tibia and a cut surface of a distal femur is identified during the surgery, so the degree of external rotation and the distance of the gap are identified simultaneously with one guide device, and thereby it is possible to facilitate the surgery, thereby reducing operation time and minimizing occurrence of a sequela of operation.