Copolymer Surface Layer for Medical Device Non-Adsorptivity
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Solution Overview
Problem
Existing surface coatings for medical devices and bioanalytical equipment do not provide adequate non-adsorptivity against biological components such as blood and proteins, leading to insufficient resistance against adsorption.
Innovation Solution
A copolymer comprising units with reactive silyl groups, biocompatible groups, and a polyoxyethylene chain is used to form a surface layer that inhibits the adsorption of biological components, with specific formulations and ratios of these units to achieve enhanced non-adsorptivity and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surface layer is formed from a compound having a biocompatible group and an alkoxysilyl group, then the surface layer provides some resistance to adsorption of biological components, but the non-adsorptivity is still not adequate
Solution Approach 1:
The patent uses a copolymer comprising multiple units: units with biocompatible groups (polyoxyethylene chains), units with reactive silyl groups, and units with specific alkoxy chains. This composite molecular structure combines the non-adsorptive properties of polyoxyethylene with the crosslinking capability of silyl groups and the hydrophobicity of alkoxy chains, achieving superior non-adsorptivity compared to simple biocompatible group compounds
Solution Approach 2:
The patent optimizes specific parameters including the ratio of different polymer units (unit A: 1-50 mass%, unit B: 1-80 mass%, unit C: 1-40 mass%), the degree of silyl group crosslinking, and the structure of alkoxy chains (n4+1)/(number of carbon atoms in R6) ≥ 0.5 but < 9. These parameter optimizations enhance the non-adsorptive performance while maintaining water resistance and durability
2Reliability
If the surface layer is designed to provide high non-adsorptivity, then protein adsorption is reduced, but water resistance and durability may be compromised
Solution Approach 1:
The copolymer structure creates different functional zones at the molecular level: polyoxyethylene units (unit B) provide hydrophilic non-adsorptive surfaces, silyl groups (unit A) provide crosslinking for durability, and alkoxy chains (unit C) provide hydrophobicity. This local functional differentiation allows simultaneous achievement of non-adsorptivity and water resistance
Solution Approach 2:
The tri-unit copolymer structure combines materials with complementary properties: the hydrophilic polyoxyethylene chains provide non-adsorptivity, the crosslinkable silyl groups provide structural integrity and water resistance, and the hydrophobic alkoxy chains enhance durability and reduce protein adsorption. This composite approach resolves the contradiction between non-adsorptivity and water resistance
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 copolymer-based surface layer exhibits superior non-adsorptivity and water resistance, effectively reducing protein adsorption and maintaining durability and wear resistance, making it suitable for medical devices and bioanalytical equipment.
Implementation Method 1
a unit (A) having a reactive silyl group
Implementation Method 2
the cured product of a compound having a biocompatible group and an alkoxysilyl group
Data Source
AI summary
A copolymer having a unit (A) having a reactive silyl group, a unit (B) having a group represented by formula (1) shown below, and a unit (C) represented by formula (2) shown below. In the formulas, n1 represents 2 or 3, and n2 represents an integer of 0 to 300, n3 represents 2 or 3, n4 represents an integer of 0 to 300, R6 represents an alkyl group, and the ratio represented by (n4+1)/(number of carbon atoms in R6) is at least 0.5 but less than 9.