Releasable Threaded Fastener for Modular Orthopaedic Implants
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Solution Overview
Problem
Existing implantable orthopaedic knee prostheses face challenges such as wear, aseptic loosening, osteolysis, ligamentous instability, and patellofemoral complications, leading to potential failure and the need for revision surgery, which is complex due to the securement methods of components like stem and femoral components.
Innovation Solution
An orthopaedic surgical instrument system featuring a fastener with dual axial sections of threads, allowing secure attachment and detachment of prosthetic components to a stem component, utilizing a tool to rotate the fastener and decouple components, facilitating easy assembly and disassembly, particularly in knee prosthesis systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional securement methods are used to attach prosthetic components to stem components, then the components are securely fixed in place, but the revision surgery becomes complex and difficult to perform
Solution Approach 1:
The fastener is divided into two separate components: a first fastener component with external threads that engages with internal threads in the stem component, and a second fastener component with external threads that engages with internal threads in the prosthetic component. This segmentation allows the fastener to be independently removable from either end, simplifying revision surgery while maintaining secure attachment during normal use
Solution Approach 2:
The fastener acts as an intermediary component between the stem component and the prosthetic component. By using a threaded fastener system with accessible ends, it provides a controlled interface that can be easily manipulated with standard surgical tools, enabling simple assembly and disassembly procedures
2Reliability
If complex securement methods are used to prevent component failure, then the attachment strength is improved, but the assembly and disassembly procedures become more difficult
Solution Approach 1:
The fastener system is segmented into two distinct components with threaded engagement at both ends. This allows each component to be independently accessed and manipulated, maintaining reliable attachment through threaded engagement while enabling simple assembly and disassembly using standard surgical instruments
Solution Approach 2:
The threaded fastener system is designed to be self-contained and self-explanatory in its assembly and disassembly process. The external threads at both ends allow the fastener to be engaged and disengaged using basic threading principles without requiring complex tools or procedures, making the system self-service friendly
Data Source
AI summary
An orthopaedic prosthesis assembly includes a first prosthetic component, a second prosthetic component, and a fastener. The first prosthetic component includes a threaded bore. The second prosthetic component includes an opening and a threaded inner wall that extends inwardly from the opening. The fastener includes a first axial section having a first plurality of threads engaged with the threaded inner wall the second prosthetic component, and a second axial section having a second plurality of threads engaged with the threaded bore of the first prosthetic component to secure the first prosthetic component to the second prosthetic component.