Offset Tool Femur Reaming Alignment
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Solution Overview
Problem
Current orthopaedic surgical instruments lack an efficient method for accurately preparing the femur during knee replacement procedures, particularly in revision surgeries, where precise alignment and reaming are critical for successful implantation of orthopaedic prostheses.
Innovation Solution
The method involves using a stem trial attached to an offset tool to advance through the femur's medullary canal, positioning a surgical block, and employing a cannulated reamer to define a chamber, followed by securing an intramedullary orthopaedic surgical instrument, which includes the stem trial, to ensure precise reaming and alignment for prosthetic implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional orthopaedic surgical instruments are used for femur preparation, then the surgical procedure can be completed, but precise alignment and reaming accuracy are insufficient
Solution Approach 1:
The offset tool is inserted through the medullary canal and nested within the reaming system, while the surgical block is attached to the distal end of the offset tool. This nested configuration allows multiple functions (alignment, reaming guidance, and positioning) to be integrated in a compact manner, improving reaming accuracy without proportionally increasing overall device complexity
Solution Approach 2:
The offset tool acts as an intermediary component that transmits alignment information from the surgical block (positioned on the femoral distal surface) to the reaming operation inside the medullary canal. This intermediary mechanism enables precise alignment to be achieved without requiring direct complex positioning systems throughout the entire instrument assembly
2Manufacturing precision
If precise alignment is achieved through multiple positioning mechanisms, then reaming accuracy improves, but the ease of operation decreases
Solution Approach 1:
The surgical block is pre-positioned on the femoral distal surface to establish the desired alignment before the reaming operation begins. The offset tool is pre-configured with the appropriate offset distance, allowing the surgeon to set up the alignment in advance and then simply follow through with the reaming operation, reducing intraoperative complexity
Solution Approach 2:
The instrument system is divided into separable components: the surgical block for positioning, the offset tool for alignment, and the reaming instrument for bone preparation. This segmentation allows each component to be optimized for its specific function while maintaining ease of assembly and operation during surgery
3Manufacturing precision
If a fixed offset tool is used for reaming, then alignment precision is maintained, but adaptability to different surgical scenarios is reduced
Solution Approach 1:
The offset tool incorporates a rotatable distal end that can be adjusted to different angular positions while maintaining the fixed offset distance. This dynamic adjustment capability allows the tool to adapt to different surgical scenarios and patient anatomies while preserving the precision alignment established by the fixed offset geometry
Data Source
AI summary
A number of orthopaedic surgical instruments for use in a surgical procedure to prepare a patient's femur to receive an orthopedic prosthesis. The tools include guide tools, cutting tools, surgical blocks, and other orthopaedic surgical instruments configured to plan and guide the preparation of the patient's femur. A method of using the orthopaedic surgical instruments is also disclosed.