Deployable-Anchor Intervertebral Cages for Narrow Access and Strong Fixation
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Solution Overview
Problem
Current intervertebral cages face challenges in navigating the narrow access pathway to the intervertebral space due to the natural curvature of vertebral bodies, and require strong anchorage to prevent dislodgment and migration, while traditional manufacturing methods have weak seams that can fail over time.
Innovation Solution
Intervertebral cages with deployable anchors manufactured using additive manufacturing techniques, such as SLM, that allow for a reduced insertion configuration and subsequent expansion, eliminating the need for external fixation and featuring a customizable, porous structure for enhanced fixation and osteosynthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cage is designed with a larger size to provide stronger structural support and anchorage, then the fixation strength is improved, but the ability to navigate the narrow access pathway deteriorates
Solution Approach 1:
The cage is divided into multiple segments or struts that can be collapsed together to reduce the overall size for insertion, then expanded after placement to provide the necessary structural support and fixation strength
Solution Approach 2:
The cage transitions from a compressed, low-profile state during insertion to an expanded, high-strength state after placement, allowing it to adapt its size dynamically to satisfy both navigation and fixation requirements
2Ease of manufacture
If traditional manufacturing methods are used, then the manufacturing process is simpler, but the seams create weak points that reduce reliability over time
Solution Approach 1:
Multiple struts and components are merged into a single monolithic structure through additive manufacturing, eliminating the need for seams or joints that would create weak points while maintaining manufacturing feasibility
3Adaptability or versatility
If the cage is designed to accommodate the natural curvature of vertebral bodies, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The cage struts are designed with curved geometries that match the natural curvature of vertebral bodies, allowing the device to adapt to anatomical variations while maintaining a relatively simple overall structure
Data Source
AI summary
Disclosed are interbody fusion spacers, or cages, for insertion between adjacent vertebrae. The cages may have integrated and deployable anchors that allow the cage to have a first, insertion configuration characterized by a reduced size to facilitate insertion through a narrow access passage and into the intervertebral space. Once implanted, the anchors of the cages may be deployed to enable better fixation to bone. The cages may promote fusion to further enhance spine stability by immobilizing the adjacent vertebral bodies.