Polyaxial Spinal Stabilization with Detachable Collars
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Solution Overview
Problem
Conventional spinal stabilization systems require large incisions and cause significant trauma to soft tissue, leading to prolonged recovery times and nerve pressure issues due to destabilization of the spine.
Innovation Solution
A minimally invasive spinal stabilization system using polyaxial fasteners and a kit of specialized instruments for inserting bone fasteners and elongated members, allowing for rigid pedicle fixation while minimizing tissue damage, with instruments like positioning needles, guide wires, and closure member drivers facilitating precise placement and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional spinal stabilization systems are used, then rigid pedicle fixation is achieved, but large incisions and significant soft tissue trauma occur
Solution Approach 1:
The system divides the stabilization function into separate components: polyaxial fasteners are inserted through small incisions to achieve pedicle fixation, while collars and connecting members provide the rigid structural connection. This segmentation allows each component to be optimized independently - fasteners for minimal tissue disruption and collars for structural strength.
Solution Approach 2:
Collars serve as intermediary elements between the bone fasteners and the connecting members. The collars receive the fasteners and provide attachment points for the connecting members, enabling rigid fixation while allowing the fasteners themselves to be inserted through minimal incisions, thus mediating between the conflicting requirements of strong fixation and tissue preservation.
2Stability of the object's composition
If conventional spinal stabilization procedures are performed, then spinal stability is restored, but recovery time is prolonged due to extensive tissue dissection
Solution Approach 1:
The procedure is segmented into minimal incision sites for fastener insertion, separate from the location where collars and connecting members are assembled and attached. This allows spinal stability to be achieved through the internal fixation structure rather than through extensive external tissue dissection and retraction, significantly reducing recovery time.
3Stability of the object's composition
If conventional systems are used, then spinal stabilization is achieved, but nerve pressure increases due to destabilization and tissue trauma
Solution Approach 1:
The polyaxial fasteners are inserted into the pedicles before the collars and connecting members are assembled and attached. This preliminary placement of the fasteners into the bone provides immediate stabilization, preventing vertebral destabilization and associated nerve pressure while allowing subsequent assembly of the external fixation structure.
Data Source
AI summary
A spinal stabilization system may be formed in a patient. In some embodiments, a minimally invasive procedure may be used to form a spinal stabilization system in a patient. Bone fastener assemblies may be coupled to vertebrae. Each bone fastener assembly may include a bone fastener and a collar. The collar may be rotated and/or angulated relative to the bone fastener. Detachable members may be coupled to the collar to allow for formation of the spinal stabilization system through a small skin incision. The detachable members may allow for alignment of the collars to facilitate insertion of an elongated member in the collars. An elongated member may be positioned in the collars and a closure member may be used to secure the elongated member to the collars.