Non-Newtonian Fluid Spinal Disc Replacement Balloon
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Solution Overview
Problem
Existing spinal disc replacement devices, particularly partial disc replacements, face issues with migration and loss of natural motion due to brittle implant materials and invasive procedures, which hinder effective treatment of spinal intervertebral disc diseases.
Innovation Solution
A non-Newtonian fluid (NNF)-based disc replacement device that uses a balloon to fill the disc space, providing support and resistance to migration through its viscoelastic properties, and can be combined with a solid spacer for enhanced structural support, allowing for minimally invasive insertion and maintaining natural spinal motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing NP replacement devices are used, then the procedure is less invasive and less expensive, but the implant material becomes brittle and inelastic, causing migration and loss of natural spine motion
Solution Approach 1:
The patent changes the physical state and rheological parameters of the implant material from solid/brittle to non-Newtonian fluid/viscoelastic. The material exhibits shear-thinning behavior (decreases viscosity under stress) and thixotropic properties (time-dependent viscosity reduction), allowing it to remain injectable and migratory-resistant while maintaining structural integrity under spinal loads
Solution Approach 2:
The patent employs composite material composition combining non-Newtonian fluid base with viscoelastic additives to create a material that simultaneously provides structural support, shock absorption, and migration resistance. The composite formulation integrates multiple functional properties that neither solid implants nor simple fluids can provide alone
2Strength
If solid implant materials are used for NP replacement, then structural support is provided, but the implant no longer facilitates natural spine motion
Solution Approach 1:
The patent introduces dynamic rheological properties to the implant material, allowing it to change its mechanical response based on applied stress and time. The material exhibits dynamic viscosity changes during spinal motion cycles, providing fluid-like behavior during movement and gel-like support during loading, thereby facilitating both natural motion and structural support
Solution Approach 2:
The patent utilizes parameter changes in the material's rheological properties, specifically viscosity and elasticity, in response to mechanical loading. The material transitions between different rheological states based on stress magnitude and duration, enabling it to adapt to varying spinal motion requirements while maintaining structural integrity
3Reliability
If traditional disc replacement devices are used, then joint replacement is achieved, but the devices may shift out of position and compress nearby nerve root structure
Solution Approach 1:
The patent changes the rheological parameters of the implant material to achieve optimal balance between structural support and migration resistance. The material's yield stress and viscosity parameters are specifically tuned to resist displacement under physiological loads while remaining injectable, thereby preventing migration and associated harmful effects on nerve structures
Solution Approach 2:
The non-Newtonian fluid acts as an intermediary between the vertebral bodies, providing a cushioning effect that distributes loads and prevents direct contact-induced migration. The fluid's viscoelastic properties allow it to absorb impact forces and reduce stress concentrations that could otherwise cause device displacement or nerve compression
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 NNF-based device effectively mitigates migration and maintains natural spinal motion by using its viscoelastic properties to resist compression forces and shield vertebral endplates from excessive loading, offering a more secure and physiological constraint within the disc space.
Implementation Method 1
a first material disposed within the first balloon, where the first material includes a first non-Newtonian fluid (NNF)
Implementation Method 2
provides an NNF-filled balloon within the cavity... using its viscoelastic properties to resist compression forces
Implementation Method 3
inserting a first balloon into the cavity... filling the first balloon with a non-Newtonian fluid (NNF)
Data Source
AI summary
A spinal disc replacement device includes a first balloon configured for insertion in a cavity within an intervertebral disc (IVD), the cavity surrounded by an annulus fibrosis (AF). In some embodiments, the spinal disc replacement device further includes a first material disposed within the first balloon, where the first material includes a first non-Newtonian fluid (NNF) and provides an NNF-filled balloon within the cavity. In some examples, the NNF-filled balloon is configured to support vertebrae disposed above the IVD.