Spiral Wire Member with Segmented Projections for Liquid Sliding
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Solution Overview
Problem
Conventional wire members experience resistance when inserted into sleeves filled with liquids due to contact with the inner wall and fluid, hindering smooth advancement or retraction.
Innovation Solution
A wire member with a core member and a spirally disposed surface member, where the projections on the surface member form contact angles of 5° or greater relative to the core member, reducing friction and enhancing sliding properties, particularly when made with fluorine-based polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wire member is inserted into a sleeve filled with liquid, then the wire member can be used in medical applications requiring liquid environment, but the wire member encounters resistance due to contact with the inner wall of the sleeve and resistance due to the liquid
Solution Approach 1:
The surface-disposed member is segmented into multiple projections along the longitudinal direction, creating discrete contact points rather than continuous contact. This segmentation reduces the overall contact area with the sleeve inner wall and allows liquid to flow through the spaces between projections, thereby reducing resistance while maintaining adaptability to liquid environments.
Solution Approach 2:
The surface-disposed member with spaced projections creates a porous-like structure with spaces between projections. This structure allows liquid to pass through rather than creating continuous resistance, enabling the wire member to slide smoothly in liquid-filled sleeves while maintaining structural integrity.
2Ease of operation
If a projection is spirally formed on the surface of a core member to improve sliding property, then the sliding property improves upon contact with the inner wall of the sleeve, but the wire member still encounters resistance when the sleeve is filled with liquid
Solution Approach 1:
The spiral projection is segmented into multiple discrete projections along the longitudinal direction, creating spaces between them. This segmentation allows liquid to flow through the spaces rather than creating continuous resistance, while the spiral arrangement maintains the sliding property by providing consistent contact points with the sleeve inner wall.
Solution Approach 2:
The surface-disposed member with spaced projections acts as an intermediary between the core member and the sleeve inner wall. It provides the necessary contact for sliding while allowing liquid to pass through the spaces, effectively mediating between the mechanical sliding requirement and the liquid flow requirement.
3Ease of operation
If the contact angle of projections is increased to reduce friction, then the sliding property improves, but the contact area with the sleeve inner wall increases
Solution Approach 1:
The projections are designed with specific local geometric qualities, including optimized contact angles (5° or greater) at critical locations. This local quality optimization ensures sufficient contact for sliding while the spaced arrangement limits the overall contact area, achieving low friction without excessive contact area.
Solution Approach 2:
The contact angle parameter of the projections is specifically optimized to be 5° or greater. This parameter change enhances the sliding property by reducing friction at the contact points while the spaced configuration of projections maintains limited overall contact area with the sleeve inner wall.
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 wire member exhibits excellent sliding properties, reducing resistance when inserted into sleeves filled with liquids, allowing for smooth advancement and retraction by minimizing contact area and fluid drag.
Implementation Method 1
a surface-disposed member that is spirally disposed on a surface of the core member so as to leave predetermined spaces along a longitudinal direction of the core member
Data Source
AI summary
A wire member that exhibits an excellent sliding property is provided.A wire member 1 includes: a core member 2 that has an elongated shape; and a surface-disposed member 3 that is spirally disposed on a surface of the core member 2 so as to leave predetermined spaces along a longitudinal direction of the core member 2. In a cross-sectional view taken along the axis of the core member 2, the front end and the rear end of each of projections 3A formed by the surface-disposed member 3 respectively form contact angles θ1, θ2 each being 5° or greater relative to the surface of the core member 2.