pH-Responsive Nanoparticles for Medical Device Biofilm Prevention

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Solution Overview

Problem

Bacterial biofilms, particularly those formed by Staphylococcus epidermidis and Pseudomonas aeruginosa, exhibit resistance and tolerance to antibiotics, complicating treatment and necessitating device removal, leading to increased cost and morbidity, as they form on medical devices and are difficult to eradicate.

Innovation Solution

Nanoparticles with a polymer conjugated via an acid labile bond, which destabilize and disrupt bacterial adhesion by releasing the polymer or degrading in response to acidic pH and gelatinase, preventing biofilm formation and proliferation without using toxic antimicrobial agents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If standard anti-microbial treatments are used, then treatment simplicity is maintained, but treatment effectiveness deteriorates due to biofilm resistance and tolerance

Engineering Contradiction:

Improvetreatment effectivenessVSAvoidtreatment complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by coating medical devices with nanoparticles before bacterial infection occurs. The nanoparticles are pre-positioned on the device surface to prevent biofilm formation from the outset, rather than attempting to treat established biofilms. This proactive approach blocks bacterial adhesion sites and prevents the initial stages of biofilm development, making treatment simpler and more effective by avoiding the need to penetrate resistant mature biofilms.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The nanoparticles serve as an intermediary between the medical device surface and bacteria. They form a protective barrier layer that mediates the interaction between the device and microbial cells, preventing direct bacterial adhesion to the device surface. The nanoparticles contain antimicrobial agents that are released in response to bacterial presence, providing targeted protection without requiring direct contact with the device or complex surgical interventions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If device removal is performed to treat biofilm infections, then infection source is eliminated, but patient morbidity and cost increase

Engineering Contradiction:

Improveinfection eradicationVSAvoidpatient morbidity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary anti-action by preventing bacterial adhesion and biofilm formation on device surfaces before infections can establish themselves. The nanoparticle coating creates a protective barrier that actively counteracts the initial bacterial attachment process, preventing the development of antibiotic-resistant biofilms that would otherwise require device removal. This preemptive protection allows devices to remain implanted without compromising patient safety.

Inventive Principle:

Principle #9Preliminary anti-action

3Reliability

If polymer is released from nanoparticles in response to acidic pH, then bacterial adhesion is disrupted, but nanoparticle stability deteriorates

Engineering Contradiction:

Improveanti-adhesion effectivenessVSAvoidnanoparticle stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by designing nanoparticles with acid-labile bonds that respond to pH changes. The nanoparticle coating remains stable at neutral pH in the bloodstream and on device surfaces, maintaining structural integrity during normal conditions. When bacteria colonize the surface and create localized acidic microenvironments, the pH change triggers bond cleavage and polymer release, disrupting bacterial adhesion. This conditional response allows the system to maintain stability when needed while becoming active precisely when bacterial infection occurs.

Inventive Principle:

Principle #35Parameter changes

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 nanoparticles effectively inhibit biofilm formation and bacterial proliferation on surfaces by destabilizing the bacterial-adhesion layer, reducing biofilm viability and bacterial growth, while being non-toxic to bacteria, thus addressing the challenge of antibiotic-resistant biofilms.

Implementation Method 1

the polymer is released from the nanoparticle core via acid hydrolysis of the acid labile bond

Methodology Applied

Scientific EffectAcid hydrolysis: Hydrolysis

Implementation Method 2

the gelatinase produced by the bacteria cause the nanoparticles of the present disclosure to degrade

Methodology Applied

Scientific EffectEnzymatic degradation: Enzyme

Data Source

PatentUS20260027064A1Methods of making and using nanoparticles for treatment of bacterial biofilm

Publication Date: 2026.01.29 BROWN UNIVERSITY

AI summary

A method of making and using nanoparticles that inhibit formation of bacterial biofilm are provided.