Injectable Water-in-Oil Emulsions for Stable MRI-Visible Drug Delivery
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Solution Overview
Problem
Current therapeutic emulsions used for hepatic arterial chemo-embolisation lack stability, reproducibility, and theranostic properties, leading to unpredictable drug concentration and systemic toxicity, and are not suitable for delivering a range of therapeutic agents while being visible under imaging.
Innovation Solution
A water-in-oil emulsion stabilized by biodegradable polyester-based nanoparticles, which encapsulates therapeutic agents and includes iron oxide particles for MRI detectability, providing stability and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If synthetic surfactants are used to stabilise pharmaceutical emulsions, then emulsion stability is improved, but toxicity and hemolytic behaviour increase
Solution Approach 1:
The patent uses biodegradable polyester-based nanoparticles as temporary stabilizing agents that decompose into harmless products (CO2 and H2O) after performing their stabilizing function. These nanoparticles replace persistent synthetic surfactants with a disposable, biodegradable alternative that eliminates long-term toxicity concerns while maintaining emulsion stability during the therapeutic window.
Solution Approach 2:
The patent changes the chemical composition parameters of the emulsion system by incorporating polyester-based nanoparticles with specific molecular weight ranges (10,000-1,000,000 g/mol) and controlled degradation characteristics. This parameter change transforms the stabilizing mechanism from synthetic surfactant-based to biodegradable polymer-based, reducing harmful effects while maintaining stability.
2Reliability
If conventional lipiodol emulsions are used for chemotherapy delivery, then tumour selectivity is improved, but emulsion stability deteriorates leading to phase separation
Solution Approach 1:
The polyester-based nanoparticles act as intermediary stabilizing agents between the oil phase (lipiodol) and aqueous phase (chemotherapy solution). These nanoparticles adsorb at the interface, reducing interfacial tension and preventing phase separation, thereby maintaining emulsion stability while preserving the tumour selectivity provided by lipiodol's inherent properties.
Solution Approach 2:
The patent creates a composite emulsion system combining lipiodol, polyester-based nanoparticles, and chemotherapy agents. This composite structure integrates the tumour selectivity of lipiodol with the stabilizing and biodegradable properties of polyester nanoparticles, achieving both stability and selectivity simultaneously.
3Ease of manufacture
If repetitive pumping of syringes is used to prepare emulsion, then emulsion formation is achieved, but reproducibility deteriorates between operators
Solution Approach 1:
The polyester-based nanoparticles provide self-assembling stabilizing properties that automatically organize at the oil-water interface without requiring precise manual control. The nanoparticles self-regulate their distribution and orientation at the interface, eliminating the need for operator-dependent pumping techniques and ensuring consistent emulsion formation across different operators.
4Reliability
If chemotherapy medicine is loaded into beads via ion exchange mechanism, then tumour exposure is improved, but versatility deteriorates as only doxorubicin and irinotecan can be loaded
Solution Approach 1:
The patent creates a universal emulsion platform where polyester-based nanoparticles can encapsulate and deliver multiple different chemotherapy agents (doxorubicin, irinotecan, and others) within the same emulsion system. The nanoparticles serve as a universal carrier that can accommodate various drug molecules, replacing the limited ion exchange mechanism with a versatile encapsulation approach.
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 emulsion maintains stability for at least 24 hours, allows controlled release of therapeutic agents, enhances tumour selectivity, and reduces toxicity, while being visible under MRI.
Implementation Method 1
A water-in-oil emulsion stabilised by biodegradable polyester-based nanoparticles
Implementation Method 2
includes iron oxide particles for MRI detectability
Data Source
AI summary
The present invention relates to a water-in-oil emulsion comprising a continuous oil phase and an aqueous phase dispersed in the form of drops, the said aqueous phase comprising polyester-based nanoparticles and at least one therapeutic agent.