Ionic Polymer Medical Devices for Sustained Agent Retention
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Solution Overview
Problem
Medical devices such as catheters and IV access devices face challenges with antimicrobial and antithrombogenic agent retention, leading to short-lived efficacy due to lack of chemical bonding between agents and polymer substrates, and complex, costly surface coating techniques are required for stabilization.
Innovation Solution
Ionic polymers with cationic, anionic, or zwitterionic functional groups are ionically bonded to antimicrobial and antithrombogenic agents, allowing for controlled release and stabilization on medical devices without the need for priming or multiple coating steps, simplifying manufacturing and extending antimicrobial and antifouling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If antimicrobial and antithrombogenic agents are impregnated directly into polymer substrates without chemical bonding, then the manufacturing process is simple, but the duration of action is short and efficacy is lost quickly
Solution Approach 1:
The patent introduces ionic functional groups (carboxylate, sulfonate, phosphonate, quaternary ammonium, etc.) into the polymer substrate during manufacturing as a preliminary action. These pre-installed ionic groups create bonding sites that will later chemically bond with antimicrobial and antithrombogenic agents, ensuring long-term retention without complicating the manufacturing process.
Solution Approach 2:
The ionic functional groups act as intermediaries between the polymer substrate and the active agents. These ionic groups form stable ionic bonds with the agents, serving as a chemical bridge that anchors the agents to the substrate and enables controlled release over extended periods.
2Duration of action of stationary object
If surface coating techniques are used to stabilize active agents on polymer substrates, then the duration of action is extended with controlled release, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent merges the substrate preparation step and the agent attachment step into a single integrated process. By incorporating ionic functional groups directly into the polymer substrate during manufacturing, the need for separate priming treatments and multiple coating steps is eliminated, simplifying the overall manufacturing process while achieving stable, long-term agent retention.
Solution Approach 2:
The patent changes the chemical parameter of the polymer substrate by introducing ionic functional groups with specific ionic characteristics. This parameter change enables direct ionic bonding with active agents, replacing complex multi-step coating processes with a simpler single-step impregnation process that achieves equivalent or superior performance.
3Reliability
If multiple surface coating steps with priming are performed to achieve stable agent attachment, then the reliability of agent retention is improved, but the productivity decreases due to increased manufacturing time
Solution Approach 1:
The ionic functional groups are pre-installed into the polymer substrate during the base manufacturing process, before the agent impregnation step. This preliminary action ensures that the substrate is ready for immediate agent attachment without requiring time-consuming priming treatments or multiple sequential coating steps, thereby improving manufacturing efficiency while maintaining reliable agent retention.
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 ionically bonded agents provide sustained antimicrobial and antithrombogenic effects, reducing bloodstream infections and thrombosis risks while simplifying the manufacturing process and reducing costs by ensuring long-term release and stability on medical devices.
Implementation Method 1
ionic polymers ionically bonded to an active agent
Implementation Method 2
anionic polymer comprises a functional group selected from one or more of carboxylate (—COO−), sulfonate (—SO3−), organosulfate (—O—SO3−), organophosphate (—O—PO3−R1 or —O—PO32−), phenolate (—C6H4—O−), and thiolate (—S−), wherein the cationic polymer comprises a functional group selected from one or more of phosphonium (—P+(R1)(R2)(R3)), imidazolium, pyridinium, sulfonium, guanidinium, thiazolium, and quinolinium
Data Source
AI summary
Medical articles formed from ionically bonding an ionic polymer and an active agent provide enhanced properties. The ionic polymer may be one or more of an anionic polymer, a cationic polymer, and a zwitterionic polymer. The device may also include a nonionic polymer. Medical articles herein have antimicrobial, anti-fouling, and/or antithrombotic characteristics.