Magnetic Microparticles Triggered Release via AC Field
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Solution Overview
Problem
Current delivery systems for biologically active agents face challenges in controlled release, particularly for conditions with temporal dependence or tolerance development, as they lack specificity and control over biological conditions, and are not suitable for large molecules like proteins or polynucleotides, with external triggers facing clinical translation hurdles due to depth limitations and toxicity concerns.
Innovation Solution
Composite microparticles comprising magnetic nanoparticles and a biocompatible polymer matrix with a melting point higher than body temperature but lower than the deactivation temperature of the agent, allowing for magnetically triggered release via an alternating magnetic field, ensuring targeted and controlled delivery of biologically active agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If internal triggers for release (e.g., shifts in biological pH) are used, then the system responds to biological conditions, but it lacks control over biological conditions and shows high variability in vivo
Solution Approach 1:
The patent introduces an external magnetic field as an intermediary trigger mechanism that mediates between the delivery system and the biological environment. The magnetic field acts as a controllable external signal that activates the polymer matrix without requiring direct interaction with variable biological conditions, thus providing reliable control while maintaining adaptability to different disease states.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, frequency, duration) to control the release of biologically active agents. By adjusting these external parameters, the system can achieve precise control over release timing and magnitude, overcoming the variability inherent in internal biological triggers while maintaining the ability to respond to different therapeutic needs.
2Ease of operation
If external triggers for release (e.g., light) are used, then remote control is achieved, but depth of penetration in tissues is limited and unintended toxic effects may occur
Solution Approach 1:
The patent replaces optical triggers (light) with magnetic field triggers. Magnetic fields penetrate tissues deeply without the absorption and scattering limitations of light, eliminating the penetration depth problem. Additionally, magnetic fields do not carry the same toxicity risks as certain light wavelengths, thus resolving both the penetration and toxic effect issues while maintaining remote control capability.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, frequency, duration) to control the release of biologically active agents. By adjusting these external parameters, the system can achieve precise control over release timing and magnitude, overcoming the variability inherent in internal biological triggers while maintaining the ability to respond to different therapeutic needs.
3Reliability
If triggered delivery mechanisms are used for small molecule therapeutics, then controlled release is achieved, but they are not amenable for adaptation for use with biomacromolecules
Solution Approach 1:
The patent employs a universal polymer matrix system that can encapsulate and deliver both small molecule therapeutics and biomacromolecules. The polymer matrix's physical-chemical properties (melting point, degradation rate) can be tuned to accommodate different payload types, making the same triggered delivery mechanism applicable to diverse therapeutic agents including proteins, peptides, and nucleic acids, thus achieving both controlled release and broad adaptability.
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
Enables precise, controlled, and targeted release of biologically active agents, including proteins and polynucleotides, overcoming the limitations of existing systems by providing external control and minimizing unintended activation, thus improving therapeutic efficacy and safety.
Implementation Method 1
application of an alternating magnetic field induces the magnetic nanoparticles to generate heat effective to melt the polymer matrix
Implementation Method 2
application of an alternating magnetic field induces the magnetic nanoparticles to generate heat effective to melt the polymer matrix
Data Source
AI summary
The present disclosure includes composite microparticles for magnetically triggered release of a biologically active agent. Also included are systems including the biocompatible composite microparticles and an alternating current (AC) magnetic field generator to magnetically trigger release of a biologically active agent from the microparticles. The present disclosure further includes methods of delivering a biologically active agent to a patient in vivo using the microparticles and systems of the present disclosure. The present disclosure also includes methods of making biocompatible composite microparticles of the present disclosure for magnetically triggered release of a biologically active agent.