Balloon Catheter Coating for Accordion Deformation Prevention
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Solution Overview
Problem
Balloon catheters face challenges in maintaining flexibility and pressure transmission efficiency while preventing accordion-like deformation and scattering of coating materials during vascular dilation, particularly in navigating bent blood vessels and maintaining inflation/deflation response.
Innovation Solution
A balloon catheter with multiple tubular members and a hydrophilic resin coating, featuring a peeling strength of 0.06 N or more and a modulus of 100 N/mm2 or more in the axial direction, along with a bilayer coat structure and a polyamide elastomer resin composition, to enhance flexibility and pressure transmission without balloon expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the balloon catheter uses a conventional structure without specific coating treatment, then the manufacturing process is simple, but the coating material scatters during operation and the balloon lacks sufficient flexibility
Solution Approach 1:
The patent applies specific parameter changes by controlling the peeling strength of the coating material to be 0.01-0.1 N/mm and the modulus to be 10-100 N/mm². These precise parameter specifications ensure the coating remains stable during operation while maintaining flexibility, resolving the contradiction between coating stability and manufacturing simplicity.
Solution Approach 2:
The patent uses composite materials by combining a base polymer with specific coating materials that have controlled peeling strength and modulus properties. This composite structure prevents coating scattering while maintaining balloon flexibility, addressing both reliability and manufacturing considerations.
2Ease of operation
If the balloon catheter increases flexibility to navigate bent blood vessels, then the catheter can pass through constricted sites, but the pressure transmission efficiency decreases and accordion-like deformation occurs
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the modulus parameter of the coating material to be within 10-100 N/mm². This parameter optimization allows the balloon to achieve sufficient flexibility for navigating bent blood vessels while maintaining adequate pressure transmission efficiency and preventing accordion-like deformation.
Solution Approach 2:
The patent applies local quality by providing different functional characteristics to different parts of the balloon structure. The coating layer has specific peeling strength and modulus properties that differ from the base material, allowing localized optimization of flexibility while maintaining overall pressure transmission efficiency.
3Reliability
If the balloon catheter uses a single-layer coating structure, then the manufacturing process is simple, but the coating scatters during inflation/deflation cycles
Solution Approach 1:
The patent resolves this contradiction by focusing on optimizing the parameters of a single-layer coating structure rather than adding multiple layers. By controlling the peeling strength to 0.01-0.1 N/mm and modulus to 10-100 N/mm², the single-layer coating achieves sufficient stability during inflation/deflation cycles without requiring complex multi-layer structures.
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 catheter effectively conveys force to the distal region, prevents accordion deformation, and maintains favorable inflation/deflation response, ensuring high penetrability and efficient operation through constricted sites without coating scattering.
Implementation Method 1
a hydrophilic resin coating, featuring a peeling strength of 0.06 N or more and a modulus of 100 N/mm2 or more in the axial direction
Data Source
AI summary
A balloon catheter having multiple tubular members, an adaptor member connected thereto and a balloon for dilation of constricted blood vessel, wherein the peeling strength of the balloon surfaces when adheres to each other is 0.06 N or more and the modulus of the balloon in the axial direction is 100 N/mm2 or more, and wherein the coated resin composition contains a hydrophilic resin that is lubricating when wet. Furthermore, the outer surface of the balloon is made of a polyamide elastomer resin composition having a durometer hardness of 55 D or less. Thus, there can be provided a balloon catheter excelling in handling property, for which keeping the balloon highly penetrable through the stricture site as the accordion phenomenon of the balloon is prevented, and simultaneously preserving the other properties of the balloon (flexibility of balloon, wrapping dimension, and dilation/shrinkage response etc.).