Polyurethane Scaffold with Aligned Fibers for Tissue Integration
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Solution Overview
Problem
Current surgical treatments for stress urinary incontinence, such as polypropylene mesh implants, have high complication rates and do not effectively mimic the mechanical properties of natural fascia, leading to inadequate tissue integration and chronic inflammatory responses.
Innovation Solution
A scaffold comprising three layers of polyurethane with randomly oriented and aligned fibers, where the first and third layers have pores suitable for human adipose-derived mesenchymal stem cell penetration, providing viscoelastic properties similar to native fascia and resistance to delamination, is developed using an electrospinning method that includes a sacrificial layer of poly-L-lactic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polypropylene mesh is used for surgical treatment, then structural support is provided, but complication rate increases and tissue integration is inadequate
Solution Approach 1:
The patent changes the material parameters from polypropylene to polyurethane, and alters the fiber orientation from random to aligned longitudinal, creating a scaffold that maintains structural support while improving biocompatibility and reducing complications through better tissue integration
Solution Approach 2:
The scaffold combines polyurethane material with specific fiber alignment characteristics to create a composite structure that provides both mechanical strength and enhanced biological performance, resolving the contradiction between structural support and tissue integration
2Strength
If polypropylene mesh is used, then structural support is provided, but mechanical properties do not mimic natural fascia
Solution Approach 1:
The patent changes material parameters from polypropylene to polyurethane and structural parameters from random to aligned fiber orientation, enabling the scaffold to mimic the viscoelastic and anisotropic mechanical properties of natural fascia while maintaining structural support functionality
Solution Approach 2:
The aligned longitudinal fibers create directional mechanical properties that locally replicate the anisotropic behavior of natural fascia, allowing the scaffold to adapt to different loading conditions similar to native tissue
3Ease of manufacture
If random fiber orientation is used, then manufacturing is simpler, but cell penetration and tissue integration are reduced
Solution Approach 1:
The electrospinning process is configured in advance to deposit fibers in aligned longitudinal orientation during scaffold fabrication, pre-establishing the directional structure that facilitates cell penetration and tissue integration before implantation occurs
Solution Approach 2:
The patent changes the fiber orientation parameter from random to aligned longitudinal during the electrospinning manufacturing process, achieving improved tissue integration while maintaining manufacturing feasibility through controlled electrospinning parameters
4Stability of the object's composition
If non-degradable materials are used, then structural stability is maintained, but chronic inflammatory response occurs
Solution Approach 1:
The patent changes the material composition from non-degradable polypropylene to biocompatible polyurethane, altering the material's interaction with host tissue to reduce chronic inflammatory response while maintaining structural stability through the scaffold's design and gradual tissue integration
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 scaffold demonstrates improved cell penetration and tissue integration, reducing inflammatory responses and enhancing mechanical properties, potentially offering a more effective and safer alternative for stress urinary incontinence treatment.
Implementation Method 1
The scaffold may comprise three layers of electrospun polyurethane: a first layer and a third layer in which the fibres are randomly spun and a second layer between said first and third layers in which the fibres are aligned longitudinally.
Data Source
AI summary
The present invention relates to a scaffold for the treatment of stress urinary incontinence, wherein the scaffold comprises three layers of polyurethane: a first layer and a third layer in which the polyurethane fibres are randomly orientated and a second layer between said first and third layers in which the fibres are aligned longitudinally; methods of making such scaffolds and uses thereof.