Silane-Modified Metal Surface for Medical Device Lubricity
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Solution Overview
Problem
Existing medical devices such as guide wires and syringe needles experience reduced lubricity when wet, leading to tissue damage and pain during insertion, and conventional coatings are prone to peeling, resulting in poor durability and sliding properties.
Innovation Solution
A surface-modified metal with a treatment layer formed by treating the metal surface with a silane coupling agent and a hydrogen abstraction type photopolymerization initiator, followed by polymerizing a monomer like 2-(meth)acryloyloxyethyl phosphorylcholine, creating a chemically fixed lubricating layer with a thickness of 50 to 800 nm for enhanced lubricity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coating resin is applied to the surface of a medical device to impart lubricity, then the sliding properties are improved, but the coating is easily peeled or removed, resulting in deterioration of sliding properties
Solution Approach 1:
The metal surface is pre-treated with a silane coupling agent before applying the lubricating resin coating. This preliminary silane treatment creates a chemical bonding layer that anchors the subsequent resin coating to the metal substrate, preventing peeling and removal during use. The silane coupling agent forms covalent bonds with both the metal surface and the resin, establishing a strong interface before the main coating is applied.
Solution Approach 2:
The silane coupling agent serves as an intermediary substance between the metal substrate and the lubricating resin coating. It chemically bonds to the metal surface through hydrolysis and condensation reactions, and simultaneously provides functional groups that bond to the resin polymer chains. This intermediary layer acts as a molecular bridge, transferring mechanical stress between the substrate and coating without failure.
2Ease of operation
If the inner surface of metal devices is coated to improve lubricity when wetted, then chemical delivery is improved, but the coating deteriorates over time
Solution Approach 1:
The silane coupling agent is applied to the metal surface before the lubricating resin coating. This preliminary treatment creates a durable chemical bonding interface that prevents the resin from detaching during repeated wetting and drying cycles, maintaining lubricity over extended periods of use.
Solution Approach 2:
The surface treatment creates a composite structure consisting of three components: the metal substrate, the silane coupling agent layer, and the lubricating resin coating. This composite material structure combines the strength and adhesion of the silane-metalsilica network with the low friction properties of the resin, achieving both improved lubricity and long-term durability when wetted.
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 surface-modified metal exhibits excellent lubricity and lubricant durability, maintaining sliding properties with reduced deterioration, while also improving productivity and economic efficiency.
Implementation Method 1
treating the metal surface with a silane coupling agent
Implementation Method 2
polymerizing a monomer in the presence of a hydrogen abstraction type photopolymerization initiator
Implementation Method 3
hydrogen abstraction type photopolymerization initiator
Data Source
AI summary
Provided are surface-modified metals and methods for modifying a metal surface, which involve a lubricating surface layer chemically fixed to the metal surface to provide excellent lubricity and excellent lubricant durability, and further which have good productivity and good economic efficiency. Included is a surface-modified metal whose surface is at least partially provided with a treatment layer having a thickness of 50 to 800 nm, the treatment layer being formed by treating a surface of a metal with a silane coupling agent, followed by adsorbing a hydrogen abstraction type photopolymerization initiator onto the surface and then polymerizing a monomer.