Dynamic Interbody Device for Spinal Motion Preservation
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Solution Overview
Problem
Current spinal implant technologies face challenges in providing dynamic stability and motion preservation while inserting devices between vertebrae, particularly due to limited access and the need for large devices that can accommodate degenerative changes and facet joint issues, often leading to complications such as device failure, migration, and adjacent segment deterioration.
Innovation Solution
The development of dynamic interbody devices with guide surfaces that allow for coupled axial rotation and lateral bending, and dynamic posterior stabilization systems that include bone fasteners and bias members to mimic natural spinal motion, enabling flexible insertion and reduced stress on adjacent spinal units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If non-dynamic intervertebral devices are used to fuse adjacent vertebrae, then spinal stability is improved, but motion is lost and stress on adjacent functional spinal units increases
Solution Approach 1:
The patent employs dynamic intervertebral devices that allow controlled motion between vertebrae while providing stability. The device includes movable components such as a piston and chamber that enable physiological movement, preventing the complete fusion of vertebrae and preserving spinal motion capabilities while still maintaining adequate stability.
Solution Approach 2:
The device allows for adjustable parameters including height, curvature, and stiffness that can be modified to match the patient's specific spinal anatomy and requirements. This enables the device to adapt to different motion needs while providing appropriate stability, resolving the contradiction between rigid stabilization and motion preservation.
2Reliability
If non-dynamic intervertebral devices are used, then bone fusion is promoted, but device size is limited by access constraints during posterior approach
Solution Approach 1:
The dynamic intervertebral device is designed with nested components that allow a compact delivery profile. The piston and chamber are configured to fit within each other during insertion, enabling the device to pass through limited access pathways during posterior approach while still providing sufficient volume to accommodate degenerative changes and promote bone fusion.
Solution Approach 2:
The device is divided into multiple segments or components that can be inserted separately and then assembled or expanded within the intervertebral space. This segmentation allows the device to navigate access constraints while achieving the necessary final size for effective bone fusion promotion.
3Object-affected harmful factors
If dynamic intervertebral devices are used to allow vertebrae movement, then stress distribution is improved and adjacent segment deterioration is reduced, but device complexity increases
Solution Approach 1:
The device incorporates dynamic elements such as movable pistons, chambers, and articulating surfaces that automatically adjust to distribute stress across the intervertebral space. These dynamic components simplify the overall structure by using motion-based stress distribution rather than complex static reinforcement, reducing adjacent segment deterioration while maintaining manageable device complexity.
4Volume of moving object
If large devices are inserted through limited posterior access space, then device insertion trauma to nerve roots increases
Solution Approach 1:
The device utilizes a nested configuration during insertion where components are housed within each other to minimize the insertion profile. This allows a larger functional device volume to be delivered through a smaller access pathway, reducing trauma to nerve roots while still providing adequate size to address degenerative changes.
Solution Approach 2:
The device is segmented into components that can be inserted sequentially through limited access, with each segment being smaller than the final assembled device. This reduces the immediate trauma during insertion while the complete device provides the necessary volume for effective treatment.
Data Source
AI summary
A method of stabilizing a human spine is provided. The spine may be stabilized by inserting one or more dynamic interbody devices in a disc space between a first vertebra and a second vertebra. A dynamic interbody device may be inserted using an anterior approach. One or more dynamic interbody devices may be inserted using a posterior approach. One or more of the dynamic interbody devices may allow for coupled axial rotation and lateral bending of the first vertebra relative to the second vertebra. The spine may also be stabilized by installing one or more posterior dynamic stabilization systems.