Expandable Vertebral Implant With Interdigitating Locking Struts
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Solution Overview
Problem
Existing vertebral implants face challenges in insertion due to small clearances and varying anatomical structures, requiring improved design considerations for ease of placement and optimal fit, especially with expandable prosthetics that can accommodate different surgical approaches and anatomical variations.
Innovation Solution
An expandable prosthetic implant with interdigitating first and second members, a ring for locking, and an actuator mechanism that allows for in situ expansion and contraction, facilitating easy insertion and secure locking through a positive lock mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an expandable prosthetic device is used for vertebral body replacement, then the device can accommodate various surgical approaches and anatomical structures, but the insertion becomes challenging due to small clearances around the prosthetic
Solution Approach 1:
The expandable prosthetic device is divided into multiple segments or struts that can be collapsed into a compact configuration for insertion through small clearances, then expanded in situ to achieve the desired size and adaptability for various surgical approaches and anatomical structures
Solution Approach 2:
The device employs a nested configuration where internal components are housed within external structures in a collapsed state, allowing the prosthetic to be inserted through limited access corridors, and then deployed outward to provide the necessary support and adaptability for different anatomical variations
2Manufacturing precision
If the prosthetic is expanded in situ after insertion, then an optimal tight fit is achieved, but the device requires complex expansion and locking mechanisms
Solution Approach 1:
The expansion mechanism is designed to be actuated by the surgeon using simple external tools that engage with the device, allowing the prosthetic to self-expand and self-lock into position without requiring complex automated systems or multiple specialized instruments
Solution Approach 2:
A ring structure serves as an intermediary component that mediates between the expansion actuator and the struts, providing a simple mechanical interface that translates rotational motion into radial expansion while maintaining structural integrity and enabling reliable locking
Data Source
AI summary
An expandable prosthetic implant for engagement between vertebrae includes a first member having a first end, a second end, a plurality of extensions and a hollow interior portion extending from the first end to the second end, wherein the plurality of extensions extend from the first end to the second end. A second member includes a first end, a second end, a hollow interior portion extending from the first end to the second end, and a plurality of extensions extending from the second end to the first end. The plurality extensions of the first member are configured to coaxially interdigitate with the second member, and the plurality of extensions of the second member are configured to coaxially interdigitate with the first member. The first member of the implant is moveable relative to the second member along a longitudinal axis.