Magnetic Polymer Pillars for Repeated Biofilm Detachment

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Solution Overview

Problem

Existing methods for removing biofilms are limited by the inability to achieve long-term control, as most biocompatible shape memory polymers can only undergo a single shape change, making it difficult to repeatedly remove established biofilms.

Innovation Solution

A surface topography with micron-scale pillars made from poly(dimethylsiloxane) embedded with superparamagnetic iron oxide nanoparticles, which can be actuated by a magnetic field to mimic the beating of human motile cilia, allowing for repeated dynamic movement and effective biofilm removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If biocompatible shape memory polymers are used for surface topography changes, then effective biofilm removal is achieved, but the shape change can only occur once limiting long-term application

Engineering Contradiction:

Improvelong-term application capabilityVSAvoidnumber of shape change cycles

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent transforms the static, single-use shape memory polymer into a dynamic, reusable system by incorporating magnetic particles that enable repeated shape changes through external magnetic field actuation. The flexible polymer matrix with embedded magnetic particles allows the surface to dynamically switch between different topographies on demand.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent replaces the thermal or mechanical activation mechanism of traditional shape memory polymers with magnetic field actuation. By embedding superparamagnetic iron oxide nanoparticles in the polymer, the shape change is triggered by magnetic forces rather than heat or mechanical stress, enabling reversible and repeatable actuation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If magnetic particles are concentrated at the free ends of pillars, then effective biofilm removal is achieved through cilia-like movement, but the manufacturing precision required to achieve this concentration increases

Engineering Contradiction:

Improvebiofilm removal effectivenessVSAvoidmagnetic particle distribution control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent utilizes the magnetic properties of the particles and the polymer matrix to achieve non-uniform distribution. By controlling the magnetic field during fabrication or using the inherent magnetic attraction, particles self-assemble at the pillar tips where the magnetic field gradient is strongest, achieving the desired concentration pattern without complex positioning.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The magnetic particles automatically concentrate at the free ends of the pillars through magnetic attraction forces during or after polymerization. This self-organization eliminates the need for precise manual positioning or complex manufacturing steps to achieve the optimal particle distribution for cilia-like movement.

Inventive Principle:

Principle #25Self-service

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 solution achieves greater than 99.9% removal of biofilm cells with repeated use, demonstrating long-term antifouling effects and biocompatibility, suitable for biomedical applications.

Implementation Method 1

A plurality of magnetic particles disposed in each of the plurality of pillars such that the magnetic particles are more highly concentrated in the free ends of each of the plurality of pillars

Methodology Applied

Scientific EffectSuperparamagnetism: Superparamagnetism

Implementation Method 2

The application of a magnetic field over the plurality of pillars causes movement of the end regions of each pillar due to the presence of magnetic particles

Methodology Applied

Scientific EffectMagnetic field actuation: Magnetic Field

Implementation Method 3

polymerizing the monomer of the mixture containing the plurality of magnetic particles to form a polymer with entrapped magnetic particles

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Implementation Method 4

migrating the magnetic particles to the plurality of free ends

Methodology Applied

Scientific EffectMagnetic particle migration: Magnetic Field

Implementation Method 5

The step of migrating the magnetic particles to the plurality of free ends may comprise the step of using gravity

Methodology Applied

Scientific EffectGravity: Gravitation

Data Source

PatentUS11648374B2Surface topography with ferromagnetic polymer pillars capable of movement in response to magnetic fields

Publication Date: 2023.05.16 SYRACUSE UNIVERSITY

AI summary

An anti-fouling surface having micron scale pillars embedded with Fe3O4 nanoparticles is designed. The pillars may be repeatedly induced to move according to a predetermined frequency, such as one that mimic that of the beating movement of natural cilia, through the application of a magnetic field. When square-shaped pillars with a height of 10 μm, width of 2 μm, and inter-pattern distance of 5 μm actuated for three minutes, more than 99.9 percent of biofilm cells were detached and via gentle rinsing from the surface having the pillars. The anti-fouling surface enables effective prevention of biofilm formation and removal of established biofilms, and can be applied to a broad spectrum of polymers.