Intervertebral Disc Prosthesis Single-Step Dual Fixation
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Solution Overview
Problem
Surgical procedures for inserting intervertebral disc prostheses into the spinal column are high-risk due to the proximity of the spinal cord, necessitating simplified methods for proper spacing and fixation of vertebrae.
Innovation Solution
An intervertebral disc prosthesis with a fixation mechanism using tusks and/or screws that engage endplates of adjacent vertebrae, along with a tool for simplified insertion, facilitating dual-point fixation through a single-step procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multi-step fixation procedures are used, then fixation reliability is improved, but surgical risk and procedure complexity increase
Solution Approach 1:
The patent combines multiple fixation functions into a single integrated prosthesis device that performs both spacing and dual-point fixation simultaneously. The face plate with tusks and screws integrates vertebra-to-vertebra fixation, vertebra-to-device fixation, and device-to-device fixation in one component, eliminating the need for separate fixation procedures and reducing surgical complexity while maintaining reliability
Solution Approach 2:
The prosthesis is pre-configured with fixation elements (tusks and screws) positioned to engage vertebral endplates upon insertion. The face plate is pre-shaped to facilitate automatic engagement with the vertebral body, and the screw trajectories are pre-determined by the device geometry, allowing repeatable single-step fixation without complex intraoperative positioning
2Stability of the object's composition
If traditional fixation methods are used, then fixation stability is achieved, but surgical time and procedure duration increase
Solution Approach 1:
The fixation mechanism is segmented into distinct functional elements (tusks for initial engagement, screws for secure fixation) that work in sequence during a single insertion step. This segmentation allows each element to perform its specific function efficiently without requiring multiple separate surgical steps, reducing surgical time while maintaining stable fixation
Solution Approach 2:
The prosthesis design incorporates pre-determined screw trajectories and tusk positioning that automatically align with vertebral anatomy upon insertion. This preliminary configuration eliminates the need for time-consuming intraoperative measurement and positioning, allowing rapid achievement of stable fixation in a single surgical step
Data Source
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AI summary
The present disclosure generally relates to an intervertebral disc prosthesis for partially or totally replacing an organic intervertebral disc. The disc prosthesis includes an interbody device, a face plate and a pair of locking mechanisms for achieving dual fixation in the cephalad and caudal direction. Methods according to the present disclosure achieve such dual fixation in a single fixation step.