Flexible Guides for Spinal Stabilization
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Solution Overview
Problem
Traditional spinal dynamic stabilization systems require large surgical sites for implantation, and existing solutions face difficulties when the spine's curvature causes guide rod convergence, making it challenging to position spacers between pedicle screws.
Innovation Solution
A spinal stabilization apparatus featuring vertebral anchors with flexible guides and channels that allow for top loading of a flexible cord and spacer, enabling minimally invasive installation by directing the cord and spacer along the guides and securing it within slots, even in curved spinal regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rigid rods and large surgical sites are used for spinal stabilization, then reliable fixation is achieved, but patient trauma and surgical invasiveness increase
Solution Approach 1:
The patent employs flexible guides made of polymeric material instead of rigid rods for directing the cord and spacer. These flexible guides can bend to accommodate spinal curvature while still providing the necessary guidance function, reducing surgical invasiveness while maintaining fixation reliability
Solution Approach 2:
The patent transitions from static rigid fixation to dynamic flexible stabilization. The flexible guides and cord system allows for natural spinal movement while maintaining stabilization, reducing patient trauma while ensuring reliable fixation through adaptable rather than rigid means
2Manufacturing precision
If rigid guide rods are used to direct cord and spacer, then positioning accuracy is improved, but difficulty increases when spine curvature causes guide rod convergence
Solution Approach 1:
The flexible guides can conform to the curved anatomy of the spine, maintaining positioning accuracy while adapting to spinal curvature. This flexibility eliminates the convergence problem associated with rigid guide rods in curved spinal regions
Solution Approach 2:
The patent changes the physical parameter of guide rigidity to flexibility. By using polymeric flexible guides instead of rigid rods, the system can adapt its shape to match spinal curvature while maintaining the guidance function for accurate spacer positioning
3Ease of manufacture
If cord threading is performed after spacer positioning, then spacer placement is simplified, but large surgical sites are required increasing patient trauma
Solution Approach 1:
The flexible guides are pre-positioned in the vertebral anchors before spacer insertion. These guides create a prepared pathway that directs the cord and spacer into proper position, simplifying the placement process while allowing for minimally invasive surgery through smaller surgical sites
Solution Approach 2:
The flexible guides serve as intermediary elements that facilitate the insertion of the cord and spacer. By providing a pre-established pathway, the guides mediate between the external insertion point and the final positioned configuration, enabling simplified placement through minimally invasive access
Data Source
AI summary
In one embodiment, a spinal stabilization apparatus includes a vertebral anchor having a head portion and a bone attachment portion. An elongate, flexible guide is removably coupled to the head portion of the vertebral anchor and has a channel extending longitudinally thereof and communicating with a slot in the head portion of the anchor. An elongate cord may be received within the channel to facilitate inserting and securing a spacer between pairs of anchors installed into adjacent vertebrae of a person's spine.