Hydrophilic Coating for Medical Devices Reducing Protein Binding
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Solution Overview
Problem
Medical devices made from polymeric materials often suffer from poor biocompatibility due to irreversible protein and lipid binding, leading to rejection or deterioration of device performance, especially when in contact with biological fluids.
Innovation Solution
A formulation comprising 0.1 to 7 wt.% of a block copolymer of ethylene oxide and propylene oxide, 0.1 to 5 wt.% of polyacrylic acid salt, and 0.01 to 3 wt.% of propoxylated ethylenediamine compound, which increases the biocompatibility and wettability of medical devices by reducing protein and lipid binding and biofilm formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone is added to polymers to improve flexibility and oxygen permeability, then device performance is improved, but surface wettability deteriorates
Solution Approach 1:
The patent applies different surface treatments to different regions of the medical device. The silicone-containing polymer bulk maintains flexibility and oxygen permeability, while a separate hydrophilic coating is applied only to the surface that contacts biological fluids. This local differentiation allows each region to have optimized properties for its specific function.
Solution Approach 2:
The patent creates a composite structure combining silicone-containing polymer with hydrophilic materials. The bulk material provides mechanical properties and oxygen permeability, while the surface coating layer provides wettability. This composite approach resolves the contradiction by combining materials with complementary properties in a layered structure.
2Ease of operation
If polymeric materials are used to manufacture medical devices, then device flexibility is improved, but biocompatibility deteriorates due to protein and lipid binding
Solution Approach 1:
The patent introduces a hydrophilic coating as an intermediary layer between the polymeric device surface and biological fluids. This intermediate layer prevents direct contact between the hydrophobic polymer and proteins/lipids, thereby reducing irreversible binding while maintaining device flexibility. The coating acts as a protective mediator that preserves biocompatibility.
Solution Approach 2:
The patent changes the surface energy parameters of the device by applying a hydrophilic coating. This modification alters the contact angle and wettability characteristics without changing the bulk polymer properties. The parameter change at the surface level resolves the biocompatibility issue while preserving mechanical flexibility.
3Ease of operation
If silicone containing components are incorporated into polyurethane polymers, then device flexibility is improved, but surface wettability deteriorates leading to increased protein and cell binding
Solution Approach 1:
The patent segments the device into two functional components: the silicone-containing polyurethane bulk material that provides flexibility and mechanical integrity, and a separate hydrophilic surface coating that prevents protein and cell binding. This segmentation allows each component to perform its specific function without interfering with the other.
Solution Approach 2:
The hydrophilic coating serves as an intermediary barrier between the silicone-containing polymer and biological substances. This intermediate layer blocks direct interaction between the hydrophobic polymer surface and proteins/cells, thereby reducing binding while maintaining the flexibility benefits of the silicone polymer.
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 formulation significantly reduces the contact angle of medical devices, enhancing their wettability and biocompatibility, thereby improving comfort and performance both initially and after extended use.
Implementation Method 1
a. 0.1 to 7 wt. % of at least one block copolymer of ethylene oxide and propylene oxide, generally having the structure of ethylene oxide-propylene oxide-ethylene oxide
Implementation Method 2
b. 0.1 to 5 wt. % of at least one polyacrylic acid salt
Implementation Method 3
c. 0.01 to 3 wt. % of propoxylated ethylenediamine compound
Data Source
AI summary
There is disclosed a formulation suitable for the reduction or prevention of contamination of articles by microorganisms. The formulation includes at least one block copolymer of ethylene oxide and propylene oxide, at least one polyacrylic acid salt, and at least one propoxylated ethylenediamine compound.