Orthopedic Impactor Coupling for Narrow-Space Prosthesis Extraction
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Solution Overview
Problem
Existing orthopedic impactors require a large maneuvering space due to pincer mechanisms, making them impractical in narrow surgical environments and necessitating complex compensation operations, while also requiring significant surgeon skill and space for operation.
Innovation Solution
An orthopedic impactor and extractor device with a coupling end that rotates and translates axially to couple and decouple with the prosthesis, minimizing space requirements and using a roto-translation movement for stable coupling, facilitated by a push rod and lever system for single-handed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pincer mechanism is used to grip the femoral component, then reliable coupling and resistance during hammer abutting is ensured, but the action space required is much larger than the size of the femoral component
Solution Approach 1:
The device is divided into a main body and a separate coupling rod with coupling end, allowing the coupling mechanism to be compact while maintaining grip reliability through modular design
Solution Approach 2:
Instead of gripping the femoral component laterally like traditional pincers, the coupling end hooks the prosthesis from the axial direction, inverting the gripping approach to reduce lateral space requirements while maintaining secure coupling
2Stability of the object's composition
If a pincer mechanism with two hinged arms is used, then stable grip on the femoral component is achieved, but the device dimensions and complexity increase
Solution Approach 1:
The complex two-arm hinged pincer mechanism is extracted and replaced with a simpler coupling rod featuring a hook-shaped coupling end, reducing mechanical complexity while preserving stable coupling through the hook geometry and axial engagement design
3Productivity
If traditional pincer impactors are used, then femoral component grafting can be performed, but significant surgeon skill and long apprenticeship are required
Solution Approach 1:
The coupling mechanism is designed to self-align and self-lock through its hook geometry and axial movement capability, reducing the skill requirement for precise manual manipulation while maintaining effective grafting capability
Solution Approach 2:
The coupling end is designed with movable guidance that allows dynamic adaptation to the prosthesis position during insertion, making the device more forgiving and easier to operate while maintaining grafting effectiveness
Data Source
AI summary
The present invention relates to an orthopedic impactor and extractor device (1) for an orthopaedic prosthesis (100), comprising a main body (2), a coupling rod (3) comprising a coupling end (7), an activation system (4) in the main body (2). The activation system (4) is associated with the coupling rod (3). The coupling end (7) is movably guided from an active position, in which the coupling end (7) is coupled to the orthopaedic prosthesis (100), to an inactive position, in which the coupling end (7) releases the orthopaedic prosthesis (100); and wherein the coupling end (7) is movably guided in a roto-translation movement between the active position and the inactive position, and vice versa. The present invention also relates to a related orthopedic impactor and extractor kit.