Unicondylar Knee Replacement Drill Guide Kit
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Solution Overview
Problem
Current unicondylar knee replacement surgeries face challenges in achieving accurate and consistent drilling and resectioning due to the complexity of the knee joint anatomy, leading to potential inaccuracies and increased surgical demands.
Innovation Solution
A kit of parts including a drill guide with an intramedullary rod and a guide spoon, along with a vertical saw guide, is used to provide precise alignment and cutting references for drilling and resectioning, ensuring accurate placement of femoral and tibial components during unicondylar knee replacement surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional drilling and resectioning methods are used in unicondylar knee replacement, then the surgical procedure can be performed, but accurate and consistent drilling and resectioning are difficult to achieve due to the complexity of knee joint anatomy
Solution Approach 1:
The surgical guide system is divided into separate modular components: an intramedullary rod inserted into the femoral canal, a drill guide that attaches to the rod, and a guide spoon for resectioning. This segmentation allows each component to perform its specific function independently while maintaining overall system accuracy, reducing the complexity of implementing a complete guidance system.
Solution Approach 2:
The intramedullary rod is inserted into the femoral canal before drilling and resectioning to establish the correct anatomical axis and orientation. This preliminary positioning provides a reference framework that guides subsequent drilling and cutting operations, ensuring accurate placement of the femoral component without requiring complex real-time measurements.
2Manufacturing precision
If multiple drilling and resectioning adjustments are made to achieve accurate component placement, then precision can be improved, but the surgical time and complexity increase
Solution Approach 1:
The drill guide and guide spoon are pre-configured with fixed geometric relationships that correspond to the desired final component orientation. By establishing the correct drilling angles and resection depths before the actual implantation, the system eliminates the need for multiple iterative adjustments during surgery, reducing surgical time while maintaining high placement accuracy.
Solution Approach 2:
The intramedullary rod serves as an intermediary reference element that translates the complex three-dimensional anatomy of the knee into simple, reproducible drilling and cutting angles. This intermediary provides a stable reference frame that guides all subsequent surgical actions, ensuring consistent results without requiring repeated measurements and adjustments.
Data Source
AI summary
A kit of parts for use in unicondylar knee replacement of a patient having a femur and a tibia comprises a drill guide and an intramedullary rod, the intramedullary rod being sized to fit within the intramedullary canal of the femur of the patient. The drill guide is arranged so as to engage a distal end of the intramedullary rod to that which engages the patient's intramedullary canal, and is formed with a foot portion sized to fit between the patient's femur and tibia before any bone is removed from the femur or tibia. The drill guide provides a guide for drilling of at least one hole in the femur. A further kit of parts for use in unicondylar knee replacement of a patient having a femur and a tibia comprises a femoral component for implantation in the femur, the femoral component having a bearing surface having a radius of curvature, and a guide spoon. The guide spoon has a bowl-shaped portion with an internal radius of curvature the same as that of the bearing surface, and a handle portion extending from the bowl-shaped portion. Methods of performing unicondylar knee replacement are also described.