Non-spherical Hydrogel Microparticle Embolic Agent Preparation
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Solution Overview
Problem
Current methods for preparing polyvinyl alcohol embolic agents are limited to spherical shapes and involve complex processes, which are not ideal for achieving effective embolization in treatments like transarterial chemoembolization for liver cancer.
Innovation Solution
A method involving an aqueous phase solution and an oil phase solution are alternately injected into an elongated channel, allowing a cross-linking reaction to occur, resulting in the formation of stable, non-spherical hydrogel microparticle embolic agents with a regular shape, simplifying the preparation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the traditional emulsification method is used to prepare polyvinyl alcohol embolic agents, then spherical droplets are formed through interfacial tension, but the embolic properties are undesirable and the process is limited to spherical shapes
Solution Approach 1:
The patent changes the fundamental parameter of droplet formation by replacing the traditional emulsification method with a microfluidic co-flow method. This allows precise control over the shape parameters (aspect ratio, length, diameter) of the embolic agents while maintaining manufacturing precision through controlled flow rates and channel geometry
Solution Approach 2:
The patent replaces the mechanical stirring and interfacial tension-based emulsification system with a microfluidic system that uses controlled fluid flow through elongated channels. This substitution enables precise shape control through flow dynamics rather than mechanical mixing, achieving both desired shape and embolic properties
2Shape
If the stretching process is used to obtain non-spherical embolic agents, then non-spherical shape is achieved, but the procedure becomes complicated with multiple steps
Solution Approach 1:
The patent performs preliminary shaping action during the formation stage itself by using elongated microfluidic channels to guide droplet formation. The non-spherical shape is established during the cross-linking process within the channel, eliminating the need for subsequent stretching operations and reducing overall process complexity
Solution Approach 2:
The patent merges the shaping process with the cross-linking process by performing both operations simultaneously within the elongated microfluidic channel. The droplets are formed and cross-linked in their final non-spherical shape within the same device, combining multiple steps into one integrated process
3Ease of manufacture
If spherical embolic agents are used, then the preparation process is simple, but the embolic effect is insufficient due to poor aggregation in blood vessels
Solution Approach 1:
The patent applies asymmetry by creating elongated non-spherical embolic agents with specific aspect ratios rather than symmetric spherical shapes. This asymmetric geometry enhances aggregation behavior in blood vessels while maintaining a relatively simple preparation process through the microfluidic co-flow method, thus improving embolization reliability without significantly increasing manufacturing complexity
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 method enables the production of uniform, non-spherical embolic agents that are easier to aggregate in blood vessels, providing a stable embolization effect and increased drug release contact area, while simplifying the preparation process and improving product uniformity compared to traditional methods.
Implementation Method 1
allow the water-soluble cross-linking agent in the oil phase solution to diffuse from the oil phase solution into the long droplets
Implementation Method 2
allow the water-soluble cross-linking agent and the polymer in the long droplets have a cross-linking reaction in the elongated channel to obtain a solidified elongated non-spherical hydrogel microparticle embolic agent
Data Source
AI summary
A preparation method for a non-spherical hydrogel microparticle embolic agent is provided. The method includes: alternately injecting a oil phase solution and an aqeuous phase solution into an elongated channel, the aqueous phase solution contains a water-soluble polymer to be cross-linked, the aqueous phase solution has a cross-linking reaction in the elongated channel to obtain a product, which is then discharged from the elongated channel to obtain the non-spherical hydrogel microparticle embolic agent. This preparation method is simple in process, and the non-spherical hydrogel microparticle embolic agent obtained from this method has good embolization performance.