Non-expandable Multiple-segment Lockable Spinal Cage
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Solution Overview
Problem
Existing spinal cages face challenges in manipulation control during insertion and locking in the desired position due to a lack of effective mechanisms, especially when covering multiple vertebral segments.
Innovation Solution
A multiple-segment lockable cage with pivotally connected segments, featuring a hinge mechanism with stoppers, ratchet teeth, detent mechanism, or variable center of rotation, along with a pushing element and tool for controlled manipulation and locking, allowing for precise orientation and secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple segments are connected with hinges, pivots or turning points to cover more vertebral surface, then the coverage area is improved, but the manipulation control and locking capability deteriorate
Solution Approach 1:
The cage device employs segments that can dynamically change their relative positions through controlled pivoting motion. The segments transition from a collapsed configuration during insertion to an expanded configuration for vertebral surface coverage, with the ability to lock at predetermined angles. This dynamic capability allows the device to adapt its shape and coverage area while maintaining manipulation control through the instrument.
Solution Approach 2:
The cage is divided into multiple segments that can independently pivot relative to each other around a central hinge axis. Each segment can be positioned and locked at specific angles to cover different portions of the vertebral surface. The segmentation allows for increased coverage area while maintaining individual control over each segment's position through the manipulation instrument.
2Area of stationary object
If multiple segments are connected with hinges, pivots or turning points to cover more vertebral surface, then the coverage area is improved, but the locking capability deteriorates
Solution Approach 1:
The device incorporates a ratchet mechanism that provides mechanical feedback to maintain locked positions of the segments. The ratchet teeth engage with corresponding surfaces to prevent unintended movement, while the manipulation instrument can override this locking mechanism when needed. This feedback system ensures reliable positioning and locking of segments at desired angles for optimal vertebral surface coverage.
3Device complexity
If a single segment device is used, then the device simplicity is maintained, but the coverage area is insufficient
Solution Approach 1:
The cage device employs segments that can dynamically change their relative positions through controlled pivoting motion. The segments transition from a collapsed configuration during insertion to an expanded configuration for vertebral surface coverage, with the ability to lock at predetermined angles. This dynamic capability allows the device to adapt its shape and coverage area while maintaining manipulation control through the instrument.
Solution Approach 2:
The multi-segment cage device serves multiple functions: it can be inserted in a collapsed state through narrow access paths, expanded to cover large vertebral surfaces, and locked at various angles to accommodate different anatomical configurations. The same device structure performs insertion, expansion, positioning, and locking functions, making it universally applicable to various spinal fusion scenarios.
Data Source
AI summary
A cage device includes first and second segments pivotally connected by a hinge. Pivoted movement of the segments with respect to each other is limited by a first stopper portion of the first segment abutting against a second stopper portion of the second segment.