Hip Prosthesis Shaft Anchoring Part Segmentation
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Solution Overview
Problem
Current implantable prostheses for hip or knee joints require multiple extensive surgical operations for bone lengthening, leading to a high risk of infection, as the joint components need to be decoupled for replacing distraction medullary nails with stable anchoring parts.
Innovation Solution
The prosthesis features a shaft anchoring part with locating means for external channel formation in the bone and attachment means for tool engagement, allowing the shaft anchoring part to be removed and replaced without extensive surgery, enabling bone lengthening via the side away from the joint, minimizing infection risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the joint components are decoupled to replace the distraction medullary nail with a stable shaft anchoring part, then the shaft anchoring can be stabilized, but extensive operative exposure is required increasing the risk of infection
Solution Approach 1:
The prosthesis is divided into separable components: the joint replacement part remains permanently implanted, while the shaft anchoring part can be independently exchanged. This segmentation allows the anchoring part to be replaced through a minimally invasive approach via the bone channel without requiring decoupling of the joint components, thus maintaining anchoring stability while minimizing infection risk.
Solution Approach 2:
The shaft anchoring part is designed to be extractable through the pre-formed bone channel using attachment means that engage with external tools. This extraction capability allows replacement of the anchoring part without extensive surgical exposure, reducing infection risk while maintaining the ability to achieve stable anchoring when needed.
2Adaptability or versatility
If multiple extensive surgical operations are performed for bone lengthening and prosthesis adjustment, then bone lengthening and prosthesis functionality can be achieved, but the risk of infection increases considerably
Solution Approach 1:
A bone channel is pre-formed during the initial surgery extending from the bone exterior to the shaft anchoring part. This preliminary action creates a permanent access pathway that eliminates the need for repeated extensive surgical exposures in future interventions, allowing bone lengthening and anchoring part replacement through minimal incisions, thus reducing infection risk while maintaining adaptability.
Solution Approach 2:
The pre-formed bone channel serves multiple functions: it allows insertion of the shaft anchoring part, enables replacement of distraction medullary nails, permits bone lengthening procedures, and facilitates future exchanges of anchoring components. This multi-functionality consolidates multiple surgical needs into a single access pathway, reducing the number of extensive operations required and thereby minimizing infection risk.
3Reliability
If the shaft anchoring part is designed for permanent implantation, then stable anchoring is achieved, but repeated surgical operations are required for bone lengthening and anchoring part replacement
Solution Approach 1:
The shaft anchoring part is designed with dynamic characteristics: it provides stable anchoring during the initial period and can be easily exchanged later through the bone channel using attachment means. This dynamic design allows the prosthesis to adapt to different clinical needs over time, enabling replacement of anchoring parts without extensive surgery and reducing the number of operations required while maintaining anchoring stability when needed.
Data Source
AI summary
For replacing a human hip or knee joint and the adjoining bone sections, an implantable prosthesis is provided, comprising a joint replacement part (10), a shaft replacement part (12) and a rod-shaped shaft anchoring part (16) being insertable into an axial cavity (14) in the shaft replacement part (12).