Expandable Spinal Stabilization System for Dynamic Motion Preservation
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Solution Overview
Problem
Current spinal stabilization technologies are inadequate in providing minimally invasive, adjustable, and removable solutions for dynamic posterior stabilization, often leading to complications such as migration and inadequate biomechanical restoration, especially in cases involving facet joint disorders and scoliosis.
Innovation Solution
The development of implantable systems with expandable lateral members that can be positioned laterally to the spine, allowing for adjustable distraction and stabilization of spinal motion segments, either unilaterally or bilaterally, using inflatable balloons or expandable scaffoldings, which can be anchored to maintain the desired spinal alignment and load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spine fusion is performed, then pain relief is achieved, but range of motion is limited and adjacent segments experience increased stress
Solution Approach 1:
The invention segments the stabilization function by anchoring the expandable member to only the superior vertebra, rather than fusing both vertebrae together. This allows the inferior vertebra to maintain its natural mobility while the superior vertebra provides anchorage, thus relieving pain at the treatment site while preserving range of motion in adjacent segments.
Solution Approach 2:
The expandable member transitions from a compressed delivery state to an expanded deployed state, providing dynamic adaptation. This allows the device to be minimally invasively delivered while achieving sufficient distraction and stabilization force, and enables adjustment of the distraction magnitude to balance pain relief with preservation of natural spinal motion.
2Stability of the object's composition
If traditional fusion devices are used, then spinal stabilization is achieved, but device migration occurs
Solution Approach 1:
The expandable member is delivered in a compressed one-dimensional state through a minimally invasive approach, then expands into a three-dimensional structure at the target site. This dimensional transition allows percutaneous delivery while achieving robust anchorage and stabilization in the deployed configuration, eliminating the need for large incisions and extensive tissue dissection that could compromise device positioning.
Solution Approach 2:
The expandable member self-anchors through its expansion mechanism, where the transition from compressed to expanded state creates inherent anchorage within the bone or tissue. This self-service anchoring eliminates the need for separate fixation elements that could migrate, as the expansion itself provides the stabilization force and positional stability.
3Stability of the object's composition
If fixed distraction devices are implanted, then spinal alignment is corrected, but natural spinal motion is restricted
Solution Approach 1:
The expandable member provides dynamic distraction that can be adjusted between compressed and expanded states, allowing the spinal alignment to be corrected while preserving the ability to accommodate natural spinal motion. The device maintains the corrected alignment through controlled expansion rather than rigid fixation, enabling physiological movement within the stabilized configuration.
4Stability of the object's composition
If invasive surgical approaches are used, then adequate stabilization is achieved, but recovery time increases and complications arise
Solution Approach 1:
The device is delivered in a compressed one-dimensional state through percutaneous access, avoiding large incisions and extensive tissue dissection. After deployment, it expands to a three-dimensional structure that provides adequate stabilization. This dimensional approach reduces surgical trauma, minimizes recovery time, and lowers complication rates while maintaining stabilization effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These systems enable minimally invasive, adjustable, and potentially removable stabilization of spinal segments, reducing the risk of migration and facilitating natural spinal motion while addressing facet joint disorders and scoliosis, thereby providing effective pain relief and maintaining spinal stability.
Implementation Method 1
an expandable member which is expandable from a compressed configuration to an expanded configuration having a larger volume
Implementation Method 2
The lateral members may be inflatable balloons
Data Source
AI summary
Systems and methods for stabilizing or adjusting the position of at least one spinal motion segment, such as a posterior element distraction system. The system includes an implantable member having at least one of a lateral member and a transverse member. The lateral member may be expandable in at least one dimension, for example, in a direction along the axis of the spine. The expandable member may be an inflatable balloon, expandable scaffolding, strut, or combination thereof and may provide stability and anchoring to the implantable member. The transverse member is configured to engage the spinous process and may extend from the lateral member or may extend between two laterally-opposed members. For example, the transverse members may be configured to engage an outer surface of the spinous process, and as such, act as a saddle or cradle.