Multi-Layer Tubular Membrane for Tear-Resistant Blood Leakage Control
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Solution Overview
Problem
Existing stent grafts face challenges in maintaining low liquid permeability while preventing tears or breaks at sutured locations, which can lead to blood leakage into lesion sites.
Innovation Solution
A tubular treatment device with a membrane portion forming a multi-layer structure, comprising a first layer made of fibers for strength and a second layer with lower liquid permeability to prevent blood leakage, sutured to a skeleton portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the membrane portion is fixed to the skeleton portion by suturing, then the membrane portion can be securely attached, but the membrane portion may be torn or broken at the sutured location
Solution Approach 1:
The membrane portion is constructed as a composite structure with an inner layer and an outer layer made of different materials. The inner layer provides low liquid permeability to prevent blood leakage, while the outer layer provides high strength and tear resistance at sutured locations. This composite material approach allows the membrane to maintain both secure attachment capability and resistance to tearing at sutured points.
2Reliability
If the membrane portion has low liquid permeability to prevent blood flow, then blood leakage is prevented, but the membrane portion becomes more prone to tearing or breaking
Solution Approach 1:
The membrane portion uses a composite structure where the inner layer is designed with low liquid permeability to prevent blood leakage into the lesion site, while the outer layer is designed with high strength and tear resistance. This allows the membrane to simultaneously achieve blood leakage prevention and maintain structural strength, resolving the contradiction between these two requirements.
Solution Approach 2:
Different layers of the membrane portion are assigned different functional properties: the inner layer focuses on liquid impermeability for blood containment, while the outer layer focuses on mechanical strength and tear resistance. This local differentiation of material properties allows each layer to optimize its specific function without compromising the other.
Data Source
AI summary
A membrane body for a tubular treatment device includes a tubular membrane portion (12). The membrane portion forms a multi-layer structure having a first layer (21) formed of a fiber and a second layer (22) having liquid permeability lower than that of the first layer.