Polymer-Shell Vaccine Particles for Discrete Delayed Release
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Solution Overview
Problem
Existing drug delivery systems, particularly for vaccines, face challenges in achieving controlled, discrete delayed release of pharmaceutical agents, are often non-uniform and prone to agent degradation, and require multiple doses, leading to increased costs and logistical issues.
Innovation Solution
A method using a flow chip with specific channel configurations forms uniform, spherical particles with a biocompatible polymer shell encapsulating an aqueous core, allowing controlled, discrete release of the pharmaceutical agent, through a process involving solvent and extraction phases in a microfluidic system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liposomes are used for drug delivery, then immediate release of the active agent is achieved, but stability is compromised due to lipid degradation and physical damage
Solution Approach 1:
The patent changes the material composition from lipids to polymers, fundamentally altering the stability parameters of the delivery system. The polymer shell provides enhanced stability against degradation while maintaining controlled release capabilities, resolving the contradiction between rapid release and stability.
Solution Approach 2:
The patent employs composite material structure with polymer shells encapsulating aqueous cores containing pharmaceutical agents. This composite approach combines the benefits of polymer stability with the ability to control drug release, overcoming the limitations of pure lipid-based systems.
2Duration of action of stationary object
If matrix-based approaches are used for sustained release, then sustained release profile is achieved, but controlled delayed release is difficult to implement
Solution Approach 1:
The patent segments the release function into two distinct phases: an immediate release component and a delayed release component. The polymer shell structure allows for controlled segmentation of the pharmaceutical agent, enabling delayed release by controlling shell degradation or permeability characteristics.
Solution Approach 2:
The patent introduces dynamic control mechanisms to the release system, allowing the release profile to be adjusted based on temporal requirements. The polymer shell properties can be tuned to provide delayed release, and the system can adapt to different release timing requirements through formulation adjustments.
3Reliability
If multiple vaccine doses are administered, then strong protective immunity is induced, but costs and logistical complexity increase
Solution Approach 1:
The patent merges multiple vaccine doses into a single administered unit through the use of polymer-encapsulated particles that can deliver multiple antigen loads. This consolidation reduces the number of separate administrations required while maintaining the immunogenicity needed for strong protective immunity.
Solution Approach 2:
The patent creates a universal delivery platform that can accommodate different vaccine formulations and dosing strategies within a single particle system. The polymer shell can be designed to release different amounts of antigen or different antigen types, providing multi-functionality that reduces logistical 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 produces robust, homogenous particles with high drug loading and controlled release profiles, suitable for prime/boost vaccination strategies, reducing the need for multiple doses and improving patient compliance and storage efficiency.
Implementation Method 1
a flow chip having channels formed therein including a main channel... flowing a solvent phase having droplets of the aqueous phase entrained therein through a transfer section of the main channel
Implementation Method 2
flowing the extraction phase having the droplets of the solvent phase entrained therein through an extraction section of the main channel... extracting the non-aqueous solvent of the aqueous phase
Data Source
AI summary
Provided herein is a device for producing an aqueous-core polymeric-shell particle as described herein. Also provided are methods of preparing such particles, as well as the particles themselves. The particles are useful in medicine, particular in the context of vaccines.