Removable Handle Assembly for Surgical Rasp with Play-Free Locking
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Solution Overview
Problem
Existing removable handles for surgical rasps used in femoral prosthesis implantation suffer from residual play between the handle and the rasp, leading to instability and incompatibility across different prosthesis manufacturers, requiring surgeons to use specific handles and rasps from the same manufacturer.
Innovation Solution
A detachable assembly device with a hollow tenon and mortise system, featuring a mobile slide, blocking members, and a maneuvering lever, which ensures secure locking without play and allows for compatibility with various rasp models by adjusting the clamping force through a push-member assembly with differential pitch and resilient components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a detachable assembly device is used to connect the handle to the rasp, then the assembly can be quickly detached and reattached, but residual play remains between the handle and the rasp causing instability
Solution Approach 1:
The assembly device is divided into separate functional components: a tenon element with blocking members on the handle side, and a mortise element with receiving features on the rasp side. This segmentation allows each component to perform its specific function - the tenon provides the blocking mechanism while the mortise provides the receiving structure - thereby achieving both quick assembly and complete blocking without play.
Solution Approach 2:
The blocking members are positioned within the tenon element, and the tenon element itself is inserted into the mortise element. This nested arrangement allows the blocking members to engage with the mortise structure from within, creating a compact assembly that achieves complete blocking while maintaining the quick detachable characteristic. The nested design ensures that the blocking action is integrated into the overall assembly structure rather than being a separate add-on.
2Reliability
If manufacturer-specific handles and rasps are used, then compatibility is ensured within each manufacturer's system, but the surgeon is limited to using only one manufacturer's products
Solution Approach 1:
The handle is designed with a universal tenon element that can interface with mortise elements from multiple different rasp manufacturers. The tenon's blocking members and the mortise's receiving features are designed with sufficient standardization to accommodate variations between manufacturers, allowing a single handle design to work with rasps from different manufacturers. This universal design approach enables the handle to perform the function of compatibility across manufacturer systems while maintaining the reliability of the blocking mechanism.
3Adaptability or versatility
If a standardized assembly device is designed, then compatibility with multiple rasp models is achieved, but the device complexity increases to accommodate various housing models
Solution Approach 1:
The tenon element is designed with standardized blocking members that provide universal compatibility, while the mortise element can be adapted with specific receiving features tailored to different rasp housing models. This local quality approach allows the handle's tenon to maintain consistent blocking functionality across all applications, while the rasp-side mortise can be customized to match different manufacturer specifications. This division of standardization versus customization reduces overall device complexity while maintaining versatility.
Data Source
AI summary
The present invention relates to a removable handle (1) for a surgical rasp (2) or similar, the handle (1) and the rasp (2) cooperating, at right angles to their joining ends, via contact faces which at least intersect the mean direction of transmission of the forces between the handle (1) and the rasp (2), said handle (1) having a detachable assembly device (5) and being characterized in that the detachable assembly device (5) has, on the one hand, a means of assembly (6) by engagement in a direction generally perpendicular to said contact faces and using at least two complementary elements, namely a hollow tenon (7) and a mortice (8), and, on the other hand, a locking means (9) for locking said complementary elements (7, 8) in their engaged position, that is to say when the removable handle (1) and the rasp (2) are joined together, with their contact faces applied against each other.