Medical Guide Wire Friction Reduction via Fluororesin Protrusions
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Solution Overview
Problem
Conventional medical guide wires experience high frictional resistance when inserted through catheters, leading to increased complexity and cost in manufacturing, as well as potential changes in wire properties, which are not adequately addressed by existing coatings and surface modifications.
Innovation Solution
A medical guide wire with a fluororesin coating layer containing particulate matter, where the fluororesin coating layer covers the particulate matter and forms surface protrusion-shaped projections, reducing frictional resistance without compromising the wire's strength or increasing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the guide wire core material is processed to create an uneven shape or add helical coils to reduce friction, then frictional resistance between the guide wire and catheter is reduced, but manufacturing complexity increases and the wire's strength and modulus of elasticity are affected
Solution Approach 1:
The invention applies a fluororesin coating with different surface properties to specific locations on the guide wire. The coating contains particulate matter that creates protrusions only in certain areas, providing localized friction reduction where the catheter contacts the wire, while leaving other areas unchanged. This resolves the contradiction by achieving friction reduction without complex manufacturing processes affecting the entire wire structure.
Solution Approach 2:
The invention uses a composite coating structure combining fluororesin matrix with embedded particulate matter. This composite material provides both the low-friction properties of fluororesin and the surface protrusions created by particles, achieving friction reduction through material composition rather than complex structural modifications to the wire itself.
2Object-affected harmful factors
If the guide wire core material is processed to create an uneven shape or add helical coils to reduce friction, then frictional resistance between the guide wire and catheter is reduced, but the wire's strength and modulus of elasticity are affected
Solution Approach 1:
The fluororesin coating with particulate matter is applied locally to the wire surface rather than requiring structural modifications to the entire wire. This localized approach reduces friction only where needed (at the catheter interface) while preserving the wire's overall structural integrity and mechanical properties throughout its length.
Solution Approach 2:
The fluororesin coating acts as an intermediary layer between the wire core and the catheter. This intermediate coating with its particulate protrusions provides the friction-reducing interface, allowing the wire core to maintain its original strength and mechanical properties while still achieving low-friction catheter passage.
3Object-affected harmful factors
If an even fluororesin coating is applied to reduce friction, then frictional resistance is reduced, but the fluororesin comes into intimate contact with the catheter inner surface, reducing the effectiveness
Solution Approach 1:
The coating is designed with non-uniform surface topology through embedded particulate matter. The protrusions created by particles extend further toward the catheter, creating localized contact points that reduce friction more effectively than a uniform coating. This resolves the contradiction by making the coating's friction-reducing action more concentrated and effective where it contacts the catheter.
Solution Approach 2:
The particulate matter in the coating creates rounded protrusions that provide point or line contact with the catheter surface rather than broad surface contact. This curved, protruding geometry concentrates the friction-reducing effect at specific contact points, improving effectiveness compared to a flat, even coating that distributes contact too widely.
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 effectively lowers frictional resistance between the guide wire and catheter, facilitating easier insertion while maintaining the wire's original properties and reducing manufacturing costs.
Implementation Method 1
baking by heating to at least the melting point of the fluororesin in the fluororesin dispersion
Data Source
AI summary
A medical guide wire (1) is made in which at least a fluororesin coating layer (13) is formed on the surface of a metal wire (11), wherein particulate matter is present in the fluororesin coating layer (13), and the fluororesin coating layer covers the particulate matter and at least some of the particulate matter is formed in surface protrusion-shaped projections (14). It is thus possible to provide a medical guide wire that is inexpensive to manufacture and whose strength is unaffected and frictional resistance is low, and manufacturing method for the same.