Swellable Polymer Coating for Antibacterial Catheters
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Solution Overview
Problem
Existing methods for applying antibiotics to medical devices, such as intravascular catheters, are limited by the high polarity of most antibiotics, which prevents their dissolution in organic solvents, thereby restricting the application to only a few low-polarity antibiotics.
Innovation Solution
A method involving a swellable macromolecular material that expands when contacted with a solvent, allowing high-polarity antibiotics to penetrate and bond physically with the device, creating a sustained antimicrobial surface layer regardless of antibiotic polarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antibiotics with high polarity are used, then antimicrobial effectiveness is improved, but dissolution in organic solvent becomes difficult
Solution Approach 1:
The patent introduces a swellable macromolecular substance as an intermediary medium between the antibiotic and the organic solvent. This substance swells upon contact with water to form a gel matrix that can accommodate and release high-polarity antibiotics, thereby mediating the incompatibility between polar antibiotics and non-polar organic solvents used in medical device manufacturing
Solution Approach 2:
The patent changes the physical state and polarity parameters of the coating system by using a swellable polymer that transitions from a dry state to a swollen gel state upon water contact. This parameter change enables the system to accommodate high-polarity antibiotics that would otherwise be incompatible with organic solvent-based coating processes
2Ease of manufacture
If only low-polarity antibiotics are used, then ease of coating is improved, but applicability to most antibiotics deteriorates
Solution Approach 1:
The patent creates a universal coating system based on swellable macromolecular substances that can accommodate antibiotics with various polarities. The gel matrix formed by the swollen polymer serves as a multi-functional platform that can incorporate different types of antibiotics (high-polarity, low-polarity, water-soluble, organic-soluble) through a single standardized process, thereby achieving universality across diverse antibiotic classes
3Reliability
If antibiotics are coated on the surface, then antimicrobial function is improved, but sustained release capability deteriorates
Solution Approach 1:
The patent utilizes the porous gel structure formed by the swellable macromolecular substance to enable sustained antibiotic release. The swollen gel matrix creates a porous network that allows controlled diffusion of antibiotics from the interior to the surface over time, providing both immediate and sustained antimicrobial protection rather than simple surface coating
Solution Approach 2:
The patent incorporates antibiotics into the swellable polymer matrix during the coating formation process, before the device is implanted. This preliminary incorporation ensures that antibiotics are pre-positioned within the gel structure and will be released in a controlled manner upon contact with body fluids, rather than requiring subsequent application steps
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
Enables the reliable application of most antibiotics to medical devices, providing a sustained antimicrobial surface that effectively inhibits bacterial growth, as demonstrated by the catheter tube examples showing comparable antimicrobial effects to commercial products.
Implementation Method 1
forming a swollen area on at least a portion of the surface of the medical device by causing a medical device formed using a macromolecular material that can swell to come into contact with a solvent
Implementation Method 2
By causing medical devices to come into contact with a solvent, the solvent may penetrate into the contact area of the medical device and the aforementioned contact area of the medical device swells
Implementation Method 3
by causing the swollen area to come into contact with antibiotics, the antibiotics may enter into the swollen area
Data Source
AI summary
A medical device that includes at least one antibiotic in a macromolecular substance that swells upon contact with a solvent. Also, a method for preparing an antibiotic-containing medical device that involves contacting a medical device having at least a portion of the surface formed from a swellable macromolecular substance, with a solvent that swells the macromolecular substance, contacting the swollen macromolecular substance with at least one antibiotic, and removing the solvent from the swollen macromolecular substance.