Femoral Rasp Handle with Tangent Plane Materialization
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Solution Overview
Problem
Current femoral rasp handling systems lack a reliable method to assess the correct depth of rasp placement within the femur's medullary canal during hip prosthesis installation, leading to increased procedural complexity and duration due to reliance on practitioner judgment and cumbersome verification devices.
Innovation Solution
A gripping handle with integrated materialization means, including a support portion for the greater trochanter and a marking member that can be removably mounted, allowing visualization of the tangent plane to the greater trochanter, enabling continuous evaluation of rasp position and depth, adaptable to various prosthetic sizes and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a verification device with block and probe is used to check socket position, then measurement accuracy is improved, but device complexity and procedural time increase due to multiple assembly/disassembly steps
Solution Approach 1:
The patent combines the measurement reference functions directly into the gripping handle by integrating multiple marking members at different longitudinal positions. Each marking member indicates a specific prosthetic head center position when the support portion contacts the greater trochanter apex, eliminating the need for separate verification devices and reducing procedural steps.
Solution Approach 2:
The gripping handle is pre-configured with multiple marking members that automatically indicate correct rasping depth and prosthetic head center position when the support portion contacts the greater trochanter apex. This preliminary setup eliminates the need for post-rasping verification and multiple device assemblies.
2Ease of operation
If marking the center of prosthetic head on the grasping handle is done, then ease of operation is improved, but reliability deteriorates due to illegible markings when accommodating different prosthetic sizes and angles
Solution Approach 1:
The patent applies different marking configurations at different longitudinal positions on the handle. Each marking member is specifically designed and positioned to accommodate specific prosthetic sizes and orientations, ensuring that the appropriate marking remains clearly visible and accurate for each specific prosthesis being implanted.
Solution Approach 2:
Instead of using a single marking system, the patent divides the marking function into multiple separate marking members positioned at different longitudinal locations on the handle. Each marking member corresponds to specific prosthetic parameters, allowing the surgeon to select and use only the relevant marking for the current prosthesis, thereby maintaining accuracy across different prosthetic sizes and orientations.
3Ease of operation
If practitioner judgment is used to assess rasp burial depth, then ease of operation is maintained, but measurement precision deteriorates due to reliance on experience rather than objective measurement
Solution Approach 1:
The gripping handle automatically provides objective depth indication through its marking members when the support portion contacts the greater trochanter apex. The system serves itself by built-in geometric relationships between the handle markings and the anatomical reference point, eliminating the need for separate measurement tools or subjective practitioner judgment while maintaining operational simplicity.
Data Source
Figure 1~2
AI summary
The invention relates to a gripping handle (1) for assembly with a femoral rasp (2). The gripping handle (1) includes materialization means. The materialization means include at least one support portion (17) configured to bear against the apex (31) of the greater trochanter and at least one materialization portion (18) configured to materialize at least one point belonging to the tangent plane (P) to the apex of the greater trochanter when the support portion (17) bears against the apex (31) of the greater trochanter.