Adjustable Femoral Neck Resection Guide for Head Offset Accuracy
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Solution Overview
Problem
Current surgical instruments for femoral neck resection in hip replacement surgeries do not accurately account for the variety of head offsets, leading to potential errors and increased risks of poor biomechanics and patient outcomes.
Innovation Solution
A surgical device with a template and frame that includes a resection guide, allowing for precise positioning along the femoral neck axis to achieve distinct femoral head offsets, using a slidable connection and calibration elements for accurate resection plane indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed resection guide is used for femoral neck resection, then the surgical procedure is simplified, but it cannot accommodate the variety of head offsets leading to potential errors
Solution Approach 1:
The resection guide is made adjustable along the femoral neck axis through a slidable connection between the template and frame. This allows the guide to be dynamically repositioned to accommodate different head offsets while maintaining surgical simplicity. The guide can be moved to different positions and locked in place, providing both ease of operation and adaptability.
Solution Approach 2:
The position of the resection guide along the femoral neck axis is made variable to change the resection plane indication. By allowing the guide to be positioned at different locations (corresponding to different calibration elements), the system can accommodate various head offset parameters while keeping the overall surgical procedure straightforward.
2Productivity
If the surgeon removes too much bone at resection, then the resection is easier to perform, but joint tension must be manipulated during later stages deviating from optimal surgical plan
Solution Approach 1:
The resection guide allows the surgeon to pre-determine and mark the exact resection plane before performing the actual resection. By positioning the guide along the femoral neck axis and locking it in place, the optimal resection plane is established in advance, ensuring that the correct amount of bone is removed to maintain joint tension without requiring later manipulations.
Solution Approach 2:
The guide provides visual feedback through calibration elements and resection plane indications that show the surgeon the precise location where the resection should occur. This feedback mechanism ensures the surgeon removes the appropriate amount of bone to achieve the desired head offset, preventing both over-resection and under-resection.
3Reliability
If the surgeon does not remove enough bone, then the surgical plan is maintained, but it becomes harder to mill the calcar face effectively and reduces surgical efficiency
Solution Approach 1:
The resection guide enables the surgeon to establish the precise resection plane in advance, ensuring that the correct amount of bone is removed before proceeding to calcar face milling. This preliminary positioning prevents under-resection, which would otherwise complicate subsequent milling operations and reduce surgical efficiency.
Solution Approach 2:
The guide replaces the need for the surgeon to estimate the resection plane through experience and judgment with a mechanical system that provides objective, pre-calculated positioning. The slidable connection and calibration elements provide mechanical guidance that ensures the optimal resection plane is achieved, balancing plan adherence with surgical efficiency.
4Productivity
If the centre of rotation is misplaced during implantation, then the surgical procedure is completed, but patient leg length is affected leading to unsatisfactory results
Solution Approach 1:
The resection guide allows the surgeon to pre-establish the correct resection plane that will result in accurate centre of rotation placement. By positioning the guide before resection and using the calibration elements to determine the appropriate position, the surgeon ensures that the femoral component will be implanted with the correct offset and leg length, preventing misplaced centre of rotation.
Solution Approach 2:
The guide replicates the desired final position of the femoral component by providing a template that shows where the resection plane should be. This copying approach allows the surgeon to plan and execute the resection to achieve the precise centre of rotation placement that will result in correct leg length and satisfactory patient outcomes.
Data Source
AI summary
The invention relates to a surgical device for performing a controlled resection of the neck of a femur during a hip replacement procedure. The surgical device comprises a template comprising an aperture dimensioned for receiving a femoral head of the femur, and a frame comprising a resection guide for indicating a resection plane on the femoral neck. The femoral neck has a femoral neck axis. The frame is slidably connected to the template for positioning of the resection guide along the femoral neck axis while the template is mounted on the femoral head.