Triangulation Bar Assembly for Stable 3D Vertebral Correction
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Solution Overview
Problem
Existing lumbar vertebrae rectification systems face challenges with precise 3-dimensional corrections due to difficulties in bending connecting rods, limited correction capabilities, and potential damage to pedicle screws, especially in osteoporotic bones.
Innovation Solution
A triangulation bar assembly with bone anchoring means and adjustable connection means forms a rigid triangular structure, allowing for precise sagittal, coronal, and transverse corrections, ensuring stable attachment and minimizing risk of screw damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If connecting rods are bent to achieve vertebrae rectification, then correction capability is improved, but manufacturing precision and operational difficulty worsen
Solution Approach 1:
The connecting rod is divided into multiple segments that can be independently adjusted. Each segment can be positioned and locked at specific angles, allowing precise control of the rod's curvature without requiring complex bending operations. This segmentation enables the rod to adapt to various vertebral deformations while maintaining manufacturing and operational simplicity.
Solution Approach 2:
The connecting rod transitions from a static, pre-bent configuration to a dynamic, adjustable structure. The rod incorporates adjustable segments with locking mechanisms that allow intraoperative modification of the rod's shape and position. This dynamic capability enables precise adaptation to individual patient anatomy while avoiding the need for complex pre-bending manufacturing processes.
2Adaptability or versatility
If significant corrective forces are applied to pedicle screws, then vertebrae rectification is improved, but reliability worsens due to potential screw failure
Solution Approach 1:
The correction system is divided into multiple adjustable segments along the connecting rod, each capable of independent positioning. This segmentation distributes the corrective forces across multiple points rather than concentrating them on single pedicle screws, reducing the risk of screw failure while maintaining high correction capacity.
Solution Approach 2:
The system transitions from rigid, fixed-angle screw placements to dynamic, adjustable configurations. The connecting rod segments can be adjusted and locked at various angles to optimize force distribution during correction. This dynamic adjustment allows the surgeon to distribute corrective forces more evenly across multiple anchoring points, enhancing reliability while maintaining correction capacity.
3Adaptability or versatility
If multiaxial pedicle screws are used, then adaptability for 3D corrections is improved, but device complexity and operational difficulty worsen
Solution Approach 1:
Instead of using complex multiaxial screws, the system segments the correction function across multiple uniaxial connecting rod segments. Each segment can be independently adjusted and locked, providing 3D correction capability through a simpler, modular architecture. This segmentation reduces the complexity of individual components while maintaining overall system adaptability.
Solution Approach 2:
The system replaces complex multiaxial screw mechanisms with dynamic, adjustable connecting rod segments. Each segment can be positioned and locked at specific angles, providing multiaxial correction capability through a series of simpler, uniaxial adjustments. This dynamic approach achieves 3D correction without requiring complex multiaxial hardware, reducing overall device complexity.
4Adaptability or versatility
If connecting rods are bent to achieve correction, then correction capability is improved, but ease of operation worsens
Solution Approach 1:
The connecting rod is segmented into adjustable sections that can be independently positioned and locked. This eliminates the need for complex bending operations, as each segment can be simply adjusted to the required angle and secured. The segmentation makes the correction process more straightforward and easier to perform while maintaining full correction capability.
Solution Approach 2:
The system transitions from static pre-bent rods to dynamic adjustable segments. The connecting rod incorporates simple adjustment mechanisms that allow intraoperative modification of segment positions without requiring complex bending operations. This dynamic design significantly improves ease of operation while preserving full correction capability through straightforward angular adjustments.
Data Source
AI summary
An assembly for rectifying vertebrae, comprises: two bone anchoring means intended to be implanted on a same vertebra, a triangulation bar and a connection means for connecting the triangulation bar to each bone anchoring means and for holding the bone anchoring means in a given position in order to form, with the triangulation bar connected to the bone anchoring means by means of the connection means, a rigid triangular assembly, the triangulation bar comprising an attachment area for attaching a correction instrument arranged to ensure a rigid attachment in rotation and in translation of the correction instrument on the triangulation bar.