Spinous Process Anchoring System With Dual Linking Members
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Solution Overview
Problem
There is a need for an extradiscal posterior stabilization system that does not require engagement with the pedicle, particularly in situations where pedicle screw insertion is not desirable or feasible, such as in cases with small bony structures or cervical vertebrae where pedicle hooks require additional fixation levels.
Innovation Solution
A spinous process anchoring system that includes a primary transverse linking member extending through the spinous process with coupling assemblies at both ends, and a secondary transverse linking member positioned parallel to the primary member to resist rotation, utilizing external threads for engagement and adjustable coupling members to secure elongate connecting members along the spinal column.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pedicle screw insertion is used for spinal stabilization, then reliable fixation is achieved, but it becomes infeasible in cases with small bony structures or cervical vertebrae
Solution Approach 1:
The invention extracts the anchoring function from the pedicle and relocates it to the spinous process. The spinous process anchoring system uses a linking member that extends through the spinous process, with coupling assemblies that engage the connecting member, thereby achieving stabilization without requiring pedicle engagement. This allows the system to be applied to cervical vertebrae and other cases with small bony structures where pedicle screws are not feasible.
2Device complexity
If a single transverse linking member is used, then the structure is simple, but rotation about the axis cannot be prevented
Solution Approach 1:
The invention divides the single linking member into multiple segments: a primary transverse linking member and one or more secondary transverse linking members spaced apart along the connecting member. The secondary linking members engage the spinous process at different locations and prevent rotation about the axis of the primary linking member. This segmentation provides rotational stability while maintaining relative structural simplicity.
Data Source
AI summary
Devices and methods for anchoring one or more elongate connecting members along the spinal column include a transverse linking member positionable through a spinous process in a generally orthogonal orientation to the sagittal plane. At least one coupling assembly is engageable about an end of the linking member extending from the spinous process. The elongate connecting member is engaged to the coupling assembly in a transverse orientation to the transverse linking member.