Dual-Network Magnetic Particle Gel for Stable Vascular Embolization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing particle gels used as vascular embolic agents face challenges with stability and fragmentation under vascular pulsatile pressure, making them difficult to deliver and maintain embolization effectiveness.
Innovation Solution
A preparation method for an injectable and temperature-responsive enhanced composite dual-network magnetic particle gel is developed, involving the formation of a primary gel network through electrostatic interactions between gelatin and Fe3O4 nanoparticles, followed by hydrophilic-to-hydrophobic phase transition cross-linking of a temperature-sensitive polymer at body temperature to form a secondary network, enhancing stability and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If particle gels are used as vascular embolic agents, then they can be delivered through catheters due to shear-thinning properties, but they fragment under vascular pulsatile pressure and cannot maintain embolization effectiveness
Solution Approach 1:
The gel is segmented into magnetic particles dispersed in a hydrogel matrix, creating a composite structure where particles provide strength while the matrix provides injectability. This segmentation allows each component to fulfill its specific function: the hydrogel matrix enables shear-thinning for catheter delivery, while the magnetic particles reinforce the structure to prevent fragmentation under pulsatile pressure.
Solution Approach 2:
The invention uses a composite material system combining magnetic particles with hydrogel matrix. This composite structure integrates the advantages of both materials: the hydrogel provides shear-thinning behavior for easy injection through catheters, while the magnetic particles form a reinforcing network that prevents fragmentation and maintains embolization effectiveness under vascular pulsatile pressure.
2Strength
If covalent cross-linking technology is used to improve mechanical strength, then the gel gains sufficient strength to resist blood flow, but it becomes difficult to deliver through microcatheters and may reduce biosafety
Solution Approach 1:
The invention changes the cross-linking mechanism from covalent to magnetic interaction. By using magnetic fields for cross-linking instead of chemical covalent bonds, the gel maintains injectability through shear-thinning while achieving sufficient mechanical strength. The magnetic cross-linking is reversible and controllable, allowing the gel to flow during injection then solidify in place without requiring harsh chemical agents that would compromise biosafety.
Solution Approach 2:
The invention replaces chemical cross-linking mechanisms with magnetic field-based cross-linking. Instead of using covalent bonds formed by chemical reactions, the gel structure is stabilized by magnetic interactions between particles under an applied magnetic field. This substitution eliminates the need for chemical cross-linking agents, preserving biosafety while maintaining injectability and providing controllable mechanical strength.
3Strength
If in situ polymerization or chemical cross-linking is used for gel enhancement, then mechanical properties are improved, but toxicity issues are caused
Solution Approach 1:
The invention replaces chemical cross-linking mechanisms with magnetic field-based cross-linking. Instead of using covalent bonds formed by chemical reactions, the gel structure is stabilized by magnetic interactions between particles under an applied magnetic field. This substitution eliminates the need for chemical cross-linking agents, preserving biosafety while maintaining injectability and providing controllable mechanical strength.
Solution Approach 2:
The invention changes the cross-linking mechanism from covalent to magnetic interaction. By using magnetic fields for cross-linking instead of chemical covalent bonds, the gel maintains injectability through shear-thinning while achieving sufficient mechanical strength. The magnetic cross-linking is reversible and controllable, allowing the gel to flow during injection then solidify in place without requiring harsh chemical agents that would compromise biosafety.
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 gel exhibits excellent injectability, self-healing properties, and magnetothermal effects, enabling precise delivery and effective embolization of tumor vessels while inhibiting tumor progression with reduced cytotoxicity and pollution.
Implementation Method 1
the formation of a primary gel network through electrostatic interactions between gelatin and Fe3O4 nanoparticles
Implementation Method 2
hydrophilic-to-hydrophobic phase transition cross-linking of a temperature-sensitive polymer at body temperature to form a secondary network
Implementation Method 3
The gel exhibits excellent injectability, self-healing properties, and magnetothermal effects, enabling precise delivery and effective embolization of tumor vessels while inhibiting tumor progression
Data Source
AI summary
An injectable and temperature-responsive enhanced composite dual-network magnetic particle gel is a hydrogel, including a particle gel network formed by gelatin nanoparticles and Fe3O4 nanoparticles via an electrostatic interaction and a poly(N-isopropylacrylamide) (PNIPAM)-based temperature-sensitive polymer gel network. At room temperature, the hydrogel exhibits excellent shear-thinning and self-healing properties, and is easily injectable through needles and microcatheters. When raised to a human body temperature (37° C.), the temperature-sensitive polymer undergoes phase transition cross-linking, enhancing mechanical properties of the gel network. The hydrogel is injectable in vitro and exhibits temperature-responsive strengthening in vivo, meeting the requirements of a vascular interventional embolization material. The hydrogel can also generate magnetothermal heating under an alternating magnetic field, thereby achieving the embolization combined with magnetothermal therapy for liver cancer. The preparation method is simple, with high biocompatibility and a great potential for clinical applications.