Orthopaedic Joint Prosthesis Implant Kit with Spacer
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Solution Overview
Problem
Ensuring a minimum thickness of bone cement between the stem component and the cavity wall in orthopaedic joint prostheses is crucial to prevent loosening and failure, as insufficient cement can lead to sub-optimal fixation of the prosthesis.
Innovation Solution
An orthopaedic joint prosthesis implant kit that includes a spacer and a delivery device to maintain a separation between the cavity wall and the stem component, ensuring a minimum cement thickness, with the spacer being designed to fit between the stem and cavity wall at the proximal end and the delivery device facilitating easy placement and secure retention of the spacer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spacer is introduced to maintain minimum cement thickness, then the reliability of prosthesis fixation is improved, but the device complexity increases
Solution Approach 1:
The positioning kit is divided into separate functional components: a spacer element for maintaining cement thickness and a delivery device for positioning and removal. This segmentation allows each component to perform its specific function efficiently while simplifying the overall system through modular design.
Solution Approach 2:
The spacer acts as an intermediary object between the stem component and cavity wall, temporarily maintaining the required cement thickness during implantation. The delivery device serves as another intermediary to facilitate the placement and subsequent removal of the spacer, enabling the surgeon to control the positioning process.
2Ease of operation
If the spacer is designed to be separably connected to the delivery device, then the ease of operation is improved, but the manufacturing complexity increases
Solution Approach 1:
The connection between the spacer and delivery device is designed to be dynamic rather than static - it provides secure connection during placement but allows easy separation during removal. The separable connection mechanism enables the system to transition between different operational states (assembled for placement, separated for removal) while maintaining reliability when needed.
Data Source
AI summary
This invention relates to an orthopaedic joint prosthesis implant kit (2). The implant kit comprises a stem component (4) of an orthopaedic joint prosthesis which is intended for articulation with a mating component of the joint. The stem component has a distal end (6) and a proximal end (8), and a neck part (10) at the proximal end, and is configured for fixation in a bone cavity-using bone cement material with the distal end within the cavity and the proximal end at the opening of the cavity, and with the neck part protruding from the cavity towards the mating component of the joint. The implant kit further comprises a positioning kit (18), at least one spacer (20, 22, 24) for location between the wall of the cavity and the stem component at its proximal end, and a delivery device (26).