Guide Wire Marker Adhesion via Thin Film Coating
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Solution Overview
Problem
Existing guide wires with resin markers face issues such as increased outer diameter, marker peeling off due to radial protrusion, and reduced rigidity when trying to minimize the outer diameter.
Innovation Solution
A guide wire design featuring a core shaft with a coating film containing alternating linear marker and resin portions, where the thickness of both portions is substantially the same or the marker portion is thinner, and the marker portion's cross-sectional width decreases radially inward, enhancing adhesion and reducing peeling risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a resin marker is provided on the outer surface of the guide wire, then the visibility of the guide wire position and orientation is improved, but the outer diameter of the guide wire increases
Solution Approach 1:
The patent applies this principle by using a thin coating film formed on the outer surface of the core shaft. The coating film contains the resin marker and has a thickness of 1 µm to 10 µm, which is thin enough to not significantly increase the outer diameter of the guide wire while still providing the necessary visibility function through the resin marker.
2Illumination intensity
If the marker protrudes radially outward from the resin portion, then the visibility of the marker is improved, but the marker peels off when contacting devices or body cavity walls
Solution Approach 1:
The patent applies this principle by forming a flat coating film that does not protrude radially outward. The coating film is formed to have substantially the same thickness throughout, creating a smooth surface that maintains good contact with surrounding tissues and devices, thereby preventing marker peeling while still providing visibility through the resin portion.
Solution Approach 2:
The patent applies this principle by integrating the marker directly into the coating film structure rather than having it as a separate protruding component. The resin marker and the coating film form a unified structure where the marker is embedded within the film matrix, ensuring that they move and deform together without relative motion that could cause peeling.
3Length of moving object
If the outer diameter of the wire main body is reduced to suppress the increase in outer diameter of the guide wire, then the outer diameter is reduced, but the rigidity of the guide wire is reduced
Solution Approach 1:
The patent applies this principle by using a core shaft made of a rigid material that provides the necessary structural support and rigidity. The core shaft has a specific outer diameter and is covered with a thin coating film, creating a composite structure where the core shaft maintains rigidity while the thin coating film adds the marker function without significantly increasing the outer diameter.
Data Source
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AI summary
To provide a guide wire including a core shaft having an elongated outer shape, and a coating film formed on an outer surface of the core shaft, the coating film containing a resin. The coating film includes a marker portion containing a pigment and being linearly represented on an outer surface of the coating film and a resin portion not containing the pigment. On the outer surface of the coating film, the marker portion and the resin portion are alternately represented in a stretching direction. Of the coating film, a thickness of a portion where the marker portion is represented on the outer surface and a thickness of a portion where the resin portion is represented on the outer surface are substantially the same, or the thickness of the portion where the marker portion is represented is smaller than the thickness of the portion where the resin portion is represented.