Magnetic Hydrogel for Non-Invasive Wound Mechanical Loading
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Solution Overview
Problem
Existing skin expansion devices for wound healing, such as those using Kirschner wires, cause secondary injuries and are expensive, while magnetic nanoparticles are difficult to control for precise mechanical loading on wounds.
Innovation Solution
A magnetic hydrogel prepared from gelatin, sodium alginate, and NdFeB particles, magnetized to generate controlled magnetic forces, is applied symmetrically on a wound with driving magnets to achieve non-invasive mechanical loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If skin expander with Kirschner wires is used to stretch skin, then skin expansion capability is improved, but secondary injury to wound and blood circulation are caused
Solution Approach 1:
The patent replaces the traditional mechanical Kirschner wire system with a magnetic field-based control system. Magnetic nanoparticles embedded in the hydrogel allow remote actuation through external magnetic fields, eliminating the need for invasive mechanical anchors while achieving similar skin expansion effects through controlled hydrogel deformation.
Solution Approach 2:
The patent uses composite hydrogel materials containing magnetic nanoparticles (e.g., Fe3O4) dispersed within the polymer matrix. This composite structure enables the hydrogel to respond to magnetic fields while maintaining its mechanical properties for skin expansion, combining the benefits of biocompatible polymers with magnetic actuation capabilities.
2Object-affected harmful factors
If magnetic nanoparticles are used for wound treatment, then non-invasive treatment is achieved, but precise control for mechanical loading on wound is difficult
Solution Approach 1:
The patent controls the magnetic properties of nanoparticles by adjusting parameters such as particle size, concentration, and magnetic field strength. By varying these parameters, the hydrogel's magnetic response can be tuned to achieve precise control over the magnitude and direction of forces applied to the wound, enabling accurate mechanical loading control.
Solution Approach 2:
The patent implements feedback control mechanisms where the magnetic field application is adjusted based on the desired mechanical loading outcome. External magnetic fields are modulated in real-time to achieve precise control over hydrogel deformation and force application, allowing for accurate wound mechanical loading with non-invasive magnetic nanoparticles.
3Force
If two NdFeB magnetic nanomaterials are placed on either side of wound and driven to move towards each other, then magnetic force is generated, but counteracting force of relative movement is generated making it difficult to control
Solution Approach 1:
Instead of moving magnetic materials towards each other (attractive force), the patent uses repulsive forces by positioning like magnetic poles facing each other. This inversion of the interaction type eliminates the counteracting force problem and allows for more stable and controllable mechanical loading, as repulsive forces can be maintained without the materials colliding.
Solution Approach 2:
The patent divides the magnetic actuation system into separate controllable units - individual magnetic nanoparticles dispersed throughout the hydrogel matrix. This segmentation allows different regions of the hydrogel to be independently actuated by localized magnetic fields, enabling precise spatial and temporal control over force application without the materials moving relative to each other.
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 magnetic hydrogel provides safe and precise mechanical loading for wound contraction, promoting healing by generating controlled attractive or repulsive forces under an external magnetic field.
Implementation Method 1
the prepared magnetic hydrogel can rapidly respond to an external magnetic field, generating attractive or repulsive forces towards the magnetic field
Implementation Method 2
The NdFeB magnetic nanomaterials generate a magnetic field after being magnetized
Data Source
AI summary
A preparation method of a magnetic hydrogel includes steps as follows. A gelatin solution, a sodium alginate solution, deionized water, and NdFeB particles are mixed thoroughly to obtain a reaction precursor A solution. Calcium carbonate, gluconolactone, transglutaminase, and deionized water are mixed thoroughly to obtain a reaction precursor B solution. The reaction precursor solution A is added into the reaction precursor solution B to stir thoroughly and mix to obtain a mixture, followed by sealing the mixture to place in a constant-temperature environment to obtain the magnetic hydrogel of GA-Al@NdFeB. The magnetic hydrogel of GA-Al@NdFeB is magnetized, thereby endowing the NdFeB particles embedded within the magnetic hydrogel of GA-Al@NdFeB with magnetic polarity to obtain a magnetized magnetic hydrogel of GA-Al@NdFeB. By using the magnetic hydrogels, mechanical loading of skin wounds can be achieved, wound contraction is promoted, and the purpose of wound repair is achieved.