Ionic Polymer Compounds for Controlled Antimicrobial Catheters

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Solution Overview

Problem

Existing medical devices, such as infusion therapy catheters and catheters, face challenges with antimicrobial and antithrombogenic properties due to lack of chemical bonding between active agents and polymer substrates, leading to short-lived efficacy and complex, costly manufacturing processes.

Innovation Solution

Incorporating an ionic additive into a base polymer to form an ionic compound, which is then ionically bonded with antimicrobial and antithrombogenic agents, providing a stable and controlled release mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If surface coating techniques are used to stabilize antimicrobial agents onto substrate surface, then non-leaching or controlled release is achieved, but manufacturing process complexity increases and manufacturing costs significantly increase

Engineering Contradiction:

Improvecontrolled release of active agentVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent incorporates ionic additives directly into the polymer substrate during the manufacturing process, before the active agent is applied. This preliminary incorporation of ionic groups into the polymer structure eliminates the need for subsequent priming or plasma treatment steps that are required by conventional coating techniques, thereby simplifying the manufacturing process while maintaining controlled release capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent combines the substrate preparation function (priming/plasma treatment) and the active agent attachment function into a single integrated approach. The ionic additive incorporated into the polymer provides both the surface modification and the bonding mechanism for the active agent in one step, eliminating multiple separate manufacturing steps

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If surface coating techniques are used to stabilize antimicrobial agents onto substrate surface, then non-leaching or controlled release is achieved, but manufacturing costs significantly increase

Engineering Contradiction:

Improvecontrolled release of active agentVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

By incorporating ionic additives during the polymer manufacturing process itself, the patent eliminates the need for expensive post-manufacturing treatments such as plasma treatment or multiple coating steps. This approach reduces manufacturing costs by integrating the functional modification into the base material production

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If antimicrobial agents are impregnated directly into catheters without chemical bonding, then manufacturing is simplified, but antimicrobial efficacy is lost in a short time

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidantimicrobial efficacy duration

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

The patent introduces ionic additives as an intermediary between the polymer substrate and the active agent. These ionic groups serve as chemical anchors that form ionic bonds with oppositely charged active agents, preventing their leaching while maintaining the simplicity of the impregnation process. This intermediary layer enables both manufacturing simplicity and long-term efficacy

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite structure where the polymer substrate is combined with ionic additives to form a new material system. This composite material possesses both the mechanical properties of the original polymer and the chemical bonding capability of ionic groups, enabling secure attachment of active agents

Inventive Principle:

Principle #40Composite materials

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

Achieves extended antimicrobial and antithrombogenic effects by passively reducing thrombus and bacterial biofilm formation, simplifying manufacturing and reducing costs through direct bonding without priming or plasma treatments.

Implementation Method 1

an ionic compound ionically bonded to an active agent, the ionic compound comprising an ionic additive incorporated into a base polymer

Methodology Applied

Scientific EffectIonic bonding: Electrostatics

Data Source

PatentUS12594365B2Ionic compounds for medical device applications

Publication Date: 2026.04.07 BECTON DICKINSON & CO

AI summary

Medical articles formed from ionically bonding an ionic compound and an active agent provide enhanced properties. The ionic compound comprises an ionic additive incorporated into a base polymer. The ionic additive may be one or more of an anionic additive, a cationic additive, and a zwitterionic additive. Medical articles herein have antimicrobial, anti-fouling, and/or antithrombotic characteristics.