Modular Prosthesis Rasp With Lateral Recess
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Solution Overview
Problem
Existing modular prosthesis rasps often cause unintended damage to the trochanter and surrounding soft tissue when inserted into the femur's medullary cavity due to their outer contour design, leading to potential injury during hip joint endoprosthesis preparation.
Innovation Solution
A modular prosthesis rasp design with a rasp body part receptacle that is open laterally and has an incision angle of less than 85°, allowing the rasp main body to be securely connected to modular parts without contacting the trochanter, featuring a continuous contact surface and a cross-sectional area that decreases from the distal end to the proximal end to minimize trauma and facilitate optimal positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the rasp main body has a conventional outer contour design, then it can be easily manufactured and inserted, but it causes damage to the trochanter and surrounding soft tissue
Solution Approach 1:
The rasp main body features a localized modification in its outer contour: a recess is formed laterally at the proximal end, creating a specific geometric configuration. This local structural change ensures that when the rasp is inserted into the medullary cavity, the lateral surface of the rasp main body does not contact the trochanter, thereby preventing soft tissue and bone damage while maintaining the overall functional integrity of the instrument
Solution Approach 2:
The invention introduces a new spatial dimension to the rasp design by creating a lateral recess that modifies the three-dimensional outer contour. This dimensional modification creates a clearance zone between the rasp main body and the trochanter, allowing the rasp to be inserted without causing trauma to surrounding structures
2Object-affected harmful factors
If the rasp main body is designed to avoid contact with the trochanter, then soft tissue damage is reduced, but the positioning precision and stability may be compromised
Solution Approach 1:
The rasp is designed as a modular system with separable components: the rasp main body and the rasp body part can be detached and reattached. This segmentation allows the rasp main body to be optimized for atraumatic insertion (with the lateral recess preventing contact with the trochanter) while the rasp body part can be configured to provide precise positioning and stable connection to the prosthesis, thereby resolving the contradiction between trauma reduction and positioning precision
Data Source
AI summary
The rasp has a rasp base body (12) with a rasp body part receptacle (20) extended from a indentation, which defines a distal end of the receptacle, at a lateral side (30) of the body up to a proximal end of the body. A tangential plane (138) of the lateral side of an outer contour at an area of the indentation and another tangential plane (140) at a rasp body part contact surface in a region of the distal end of the receptacle include an indentation angle, which is less than 85 degree. The contact surface is defined by the receptacle and faces away from the body.