Hydrophilic Copolymer Coating for Durable Medical Device Lubrication
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Solution Overview
Problem
Existing medical devices, such as catheters and guide wires, face challenges in maintaining lubricating properties during prolonged use and repeated sliding, especially in complex body lumens, necessitating improved lubrication retention and durability.
Innovation Solution
A medical device with a lubricating layer comprising a first copolymer having a specific swelling ratio and structural units derived from hydrophilic monomers and epoxy groups, and a second copolymer with alkyl vinyl ether and carboxyl groups, bonded via electron beam irradiation, enhancing the durability and lubrication retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hydrophilic polymer coating is applied to the base layer surface to provide lubricating properties, then the lubricating property is improved, but the durability against wear and abrasion deteriorates
Solution Approach 1:
The patent applies a two-layer copolymer structure where the first layer contains hydrophilic monomers for lubrication and the second layer contains epoxy groups for durability. This composite polymer structure combines the lubricating properties of hydrophilic materials with the wear resistance of epoxy-containing polymers, resolving the contradiction between lubrication and durability.
Solution Approach 2:
The lubricating layer is divided into two distinct functional layers: a first layer with hydrophilic monomers providing lubrication and a second layer with epoxy groups providing durability. This segmentation allows each layer to specialize in its function, with the first layer handling lubrication and the second layer handling wear resistance.
2Device complexity
If a single-layer polymer coating is used to simplify the structure, then the manufacturing complexity is reduced, but the lubrication retaining property deteriorates
Solution Approach 1:
The patent uses a composite two-layer polymer structure where the first layer provides lubrication and the second layer provides durability. This composite structure achieves superior lubrication retention compared to single-layer coatings, justifying the additional structural complexity through significantly improved performance.
Solution Approach 2:
The coating is segmented into two functional layers with distinct roles: the first layer contains hydrophilic monomers for lubrication while the second layer contains epoxy groups for durability and wear resistance. This segmentation enables the coating to maintain lubrication properties over extended periods and under repeated sliding conditions.
3Adaptability or versatility
If the medical device is used in complex body lumens for prolonged periods, then the clinical applicability is improved, but the lubrication durability deteriorates
Solution Approach 1:
The patent employs a composite two-layer copolymer structure specifically designed to withstand the demanding conditions of complex body lumens. The first layer with hydrophilic monomers provides initial lubrication while the second layer with epoxy groups maintains durability during prolonged use, enabling the device to adapt to complex anatomical structures without losing lubrication properties.
Solution Approach 2:
The patent optimizes the chemical composition parameters of the copolymers, specifically the ratios of hydrophilic monomers to epoxy-containing monomers, to achieve the desired balance between lubrication and durability. This parameter optimization enables the coating to maintain its lubricating properties throughout prolonged use in complex body lumens.
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 device achieves enhanced lubrication retention and durability, ensuring effective lubrication even with repeated sliding, thereby improving the operability of medical devices in complex body lumens.
Implementation Method 1
the first layer includes a first copolymer having a structural unit derived from a hydrophilic monomer and a structural unit having an epoxy group, and has a swelling ratio of more than 70% and less than 1000%
Implementation Method 2
a medical device with a lubricating layer comprising a first copolymer having a specific swelling ratio and structural units derived from hydrophilic monomers and epoxy groups, and a second copolymer with alkyl vinyl ether and carboxyl groups, bonded via electron beam irradiation
Data Source
AI summary
A medical device with improved lubrication retaining property includes a base layer, and a lubricating layer having a first layer formed on at least a part of the base layer, and a second layer formed on at least a part of the first layer, in which the first layer includes a first copolymer having a structural unit derived from a hydrophilic monomer and a structural unit having an epoxy group, and has a swelling ratio of more than 70% and less than 1000%, and the second layer includes a second copolymer having a structural unit having an alkyl vinyl ether group and a structural unit having a carboxyl group or a salt or ester thereof.