Catheter Coil Body With Ground Thick Wires
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Solution Overview
Problem
Conventional catheters with coil bodies formed by thin and thick wires exhibit unevenness on their surfaces, leading to increased sliding resistance and coating adhesion issues, particularly when interacting with blood vessel walls or combined devices.
Innovation Solution
A catheter design featuring a tube body with an inner layer, a reinforcing coil layer formed by winding thin and thick wires into a helical structure, where the thick wires are ground to create a substantially semicircular cross-sectional shape, maintaining constant inner and outer diameters, and optionally including a braid layer for increased rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If thin wires and thick wires are used to form the coil body, then rotation transmission performance and press-in performance are improved, but surface unevenness occurs on the outer peripheral surface or inner peripheral surface of the coil body
Solution Approach 1:
The patent applies local quality by differentiating the cross-sectional shapes of wires at different locations within the coil body. Thick wires are positioned on the outer peripheral side with a circular segment cross-section, while thin wires are positioned on the inner peripheral side with a circular cross-section. This local differentiation allows the thick wires to provide structural support and rotation transmission performance while the thin wires fill gaps to maintain surface smoothness, thereby resolving the contradiction between improved operation performance and surface uniformity.
2Shape
If surface unevenness occurs on the outer peripheral surface or inner peripheral surface of the coil body, then sliding resistance increases between the catheter and blood vessel wall or combined device
Solution Approach 1:
The patent uses local quality to create a smooth outer peripheral surface by positioning thick wires with circular segment cross-sections on the outer side and thin wires with circular cross-sections on the inner side. This arrangement ensures that the outer surface remains uniform and smooth, reducing sliding resistance between the catheter and the blood vessel wall or combined devices, while still maintaining the structural benefits of using both thick and thin wires.
3Shape
If surface unevenness occurs on the outer peripheral surface or inner peripheral surface of the catheter, then coating adhesion becomes insufficient
Solution Approach 1:
The patent applies local quality by configuring thick wires with circular segment cross-sections on the outer peripheral side and thin wires with circular cross-sections on the inner peripheral side. This arrangement creates a uniformly smooth outer surface that provides adequate adhesion for coating materials, ensuring reliable coating application while maintaining the mechanical performance benefits of the mixed wire structure.
Data Source
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AI summary
In a catheter 1 including an inner layer 20, a coil body 30 covering the inner layer 20, and an outer layer 50 covering the coil body 30, the coil body 30 is constituted using a plurality of single-strand wires (thin wires 41 and thick wires 42). The thick wires 42 of the coil body 30 are ground so that the cross-sectional shape thereof is formed to have a substantially semicircular shape, and an inner diameter ID and an outer diameter OD of the coil body 30 are constant in a length part in which the thick wires 42 are ground. In this manner, it is possible to prevent occurrence of unevenness on an outer peripheral surface or an inner peripheral surface of the catheter 1. In addition, when the catheter 1 is bent, the thin wires 41 move along the circular arc portion of the thick wires 42, which allows the catheter 1 to bend largely.