Inflatable Interspinous Spacer with Dual-Modulus Balloons
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Solution Overview
Problem
Conventional hard interspinous spacers used in spinal stenosis treatment tend to subside over time, losing therapeutic effect, and existing surgical methods can cause tissue damage and prolonged recovery due to large incisions and infection risks.
Innovation Solution
An inflatable interspinous spacer with two balloons of different compressive moduli, one softer and more deformable than the other, is inserted in a deflated state and inflated with filler materials to distract and lock the spinous processes, minimizing tissue disruption and incision size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hard interspinous spacers are used, then structural strength and stability are improved, but subsidence into bony spinous processes occurs over time
Solution Approach 1:
The spacer employs a composite structure combining a hard outer shell (providing structural strength) with a soft inner core material (providing cushioning and load distribution). This composite design allows the hard exterior to maintain spacing while the soft interior prevents subsidence by distributing forces over a larger area, resolving the contradiction between strength and subsidence resistance.
Solution Approach 2:
Different regions of the spacer have different mechanical properties: the outer shell is hard and rigid for structural support, while the inner core is soft and compliant for load distribution. This local differentiation allows each region to perform its specific function optimally, preventing subsidence while maintaining strength.
2Reliability
If soft spacers are used, then subsidence is reduced by distributing loads over a larger area, but structural support capability is compromised
Solution Approach 1:
The composite structure assigns structural support to the hard outer shell while the soft inner core handles load distribution. This division of labor allows the spacer to achieve both subsidence resistance and structural support capability that neither material could provide alone.
Solution Approach 2:
The spacer is segmented into two distinct functional components: a hard external structure for support and a soft internal core for load distribution. This segmentation allows each component to be optimized for its specific function, with the hard portion providing structural integrity and the soft portion preventing subsidence.
3Ease of operation
If traditional surgical methods are used for spacer insertion, then adequate access is achieved, but tissue damage and infection risk increase
Solution Approach 1:
The spacer transitions from a compact deflated state during insertion to an expanded state after placement. This dynamic transformation allows the spacer to be inserted through a small incision and then expand to its full therapeutic size in situ, minimizing tissue damage during insertion while achieving adequate access after placement.
Solution Approach 2:
The spacer is prepared in a compact deflated state for insertion through a small incision, and only then expands to its full size. This preliminary compaction allows minimally invasive insertion while still achieving the necessary therapeutic effect after deployment, reducing tissue damage and incision size requirements.
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
The inflatable spacer effectively maintains spinal spacing, reduces subsidence risk, and allows for a minimally invasive procedure with reduced tissue damage and faster recovery by distributing load and conforming to the spinous processes for improved stability and shock absorption.
Implementation Method 1
The spacer is inflated or expanded with an injectable filler material. Upon inflation, the spacer preferably distracts the spinous processes and assumes a shape that preferably retains the spacer in position
Implementation Method 2
one balloon is softer and more deformable than the other balloon
Data Source
AI summary
The present invention is directed to an inflated interspinous spacer. The interspinous spacer is inserted into the interspinous space between adjacent spinous process in a deflated or unexpanded state, and is inflated or expanded with an injectable filler material. Upon inflation, the spacer preferably distracts the spinous processes and assumes a shape that retains the spacer in position and preferably mechanically locks with the spinous processes. The spacer includes two separate balloons configured to have different compressive modulus so that one balloon is softer and more deformable than the other balloon.