Polyimide Film Medical Appliance Adhesion
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Solution Overview
Problem
Medical guide wires require enhanced adhesion between the substrate and the polyimide coat to prevent the coat from separating and causing damage, as existing solutions do not provide sufficient durability and slidability.
Innovation Solution
A medical appliance is developed with a substrate coated by a polymer film having high nitrogen or oxygen atomic content, overlaid with a polyimide film, formed using reactive sputtering techniques, which improves adhesion and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polyimide coat is formed on a core wire by vapor deposition polymerization, then lubricating property is improved, but adhesion between the coat and core wire is insufficient
Solution Approach 1:
The invention uses a composite coating structure consisting of a polyimide base coat formed by vapor deposition polymerization and a polyamide top coat formed by reactive sputtering. This composite structure combines the lubricating properties of polyimide with the superior adhesion of polyamide, resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The polyamide top coat acts as an intermediary layer between the polyimide base coat and the core wire. This intermediate layer enhances the adhesion to the core wire while maintaining the lubricating properties of the underlying polyimide layer, thus resolving the adhesion problem without sacrificing lubrication.
2Ease of operation
If a polyimide coat is formed on a core wire, then slidability is improved, but the coat may separate under great stress or during prolonged use
Solution Approach 1:
The invention employs a composite coating system where the polyamide top coat provides enhanced durability and stress resistance while the polyimide base coat maintains slidability. The synergistic combination ensures the coating remains attached during prolonged use and under great stress.
Solution Approach 2:
The invention changes the material parameters of the coating system by introducing a polyamide layer with different mechanical properties than pure polyimide. This parameter change enhances the coating's resistance to separation under stress and during prolonged use while preserving the desired slidability.
3Ease of operation
If a polyimide film is formed on a substrate, then lubricating property is improved, but adhesion to the substrate is insufficient
Solution Approach 1:
The invention uses a composite film structure with a polyimide base layer providing lubrication and a polyamide top layer providing strong adhesion to the substrate. This composite approach resolves the contradiction between achieving good lubricating properties and maintaining strong adhesion.
Solution Approach 2:
The polyamide top coat serves as an intermediary layer that bonds strongly to the substrate while the polyimide base layer provides the lubricating function. This intermediate polyamide layer acts as a bridge between the substrate and the polyimide, ensuring sufficient adhesion without compromising lubrication.
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 solution enhances the slidability and durability of medical appliances by ensuring strong adhesion between the polymer and polyimide films, preventing coat separation and improving handling and reliability.
Implementation Method 1
the polyimide film (A) and/or the polymer film (B) has been formed by reactive sputtering
Implementation Method 2
the polyimide film (A) has been formed by the reactive sputtering using a feed gas containing at least a fluorine-containing gas
Data Source
AI summary
Provided is a medical appliance excellent in slidability and durability. A medical appliance comprising a base material, a polyimide film (A) and a polymer film (B) having a higher nitrogen content and/or a higher oxygen content than respective contents of the polyimide film (A). The appliance has the polymer film (B) on a part or the whole of the surface of the base material, and has the polyimide film (A) on the polymer film (B).