Toroidal Nanoparticles for Stable Drug Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current nanoparticle delivery systems, such as liposomes and polymer vesicles, face challenges including biological instability, rapid uptake by the reticuloendothelial system, polydispersity, and uncontrolled drug release profiles, limiting their effectiveness for therapeutic and imaging applications.
Innovation Solution
The development of self-assembled, bi-concaved disc-shaped nanoparticles with an aqueous inner core and a hydrophilic outer shell comprising an amphiphilic polymer, which are stabilized through hydrophobic modification and agitation in the presence of heat and solvents, allowing for controlled drug release and targeted delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liposomes are used as drug delivery vehicles, then they are non-toxic and biodegradable, but they exhibit biological instability and rapid uptake by the reticuloendothelial system
Solution Approach 1:
The patent changes the material parameters by transitioning from lipid-based structures to polymer-based structures with specific hydrophobic/hydrophilic block compositions. This parameter change fundamentally alters the nanoparticle's interaction with biological systems, reducing reticuloendothelial uptake and extending circulation time while maintaining biocompatibility.
Solution Approach 2:
The invention employs composite block copolymers with distinct hydrophobic and hydrophilic blocks. The hydrophobic block provides structural stability and drug loading capability, while the hydrophilic block (particularly PEG) provides steric stabilization and reduced protein adsorption. This composite structure resolves the contradiction between stability and circulation persistence.
2Duration of action of stationary object
If polymer vesicles are used, then they avoid rapid RES uptake, but they are polydisperse and have poor shelf life
Solution Approach 1:
The patent utilizes the self-assembly of block copolymers into highly uniform spherical or near-spherical micellar structures. The curvature and spherical geometry provide consistent packing and uniform size distribution. This geometric principle, combined with controlled self-assembly conditions, achieves monodispersity and improves shelf stability.
Solution Approach 2:
The block copolymers self-assemble into uniform nanoparticles through spontaneous micellization in aqueous environments. This self-assembly process, driven by hydrophobic collapse and entropic effects, naturally produces monodisperse populations without requiring complex external processing, thereby achieving manufacturing precision through the material's intrinsic properties.
3Ease of manufacture
If block copolymers are prepared using precipitating methods, then amphiphilic polymers are formed, but the process is tedious and time consuming
Solution Approach 1:
The patent replaces mechanical precipitation and filtration steps with a solution-based self-assembly approach. By controlling solvent composition and temperature, the block copolymers spontaneously form the desired nanoparticle structures in solution, eliminating time-consuming mechanical separation and drying steps while maintaining product quality.
4Productivity
If conventional nanoparticle systems are used, then drug delivery is achieved, but drug release profiles are uncontrolled and bio-distributive properties are not well understood
Solution Approach 1:
The patent implements local quality differentiation through the block copolymer structure, where the hydrophobic core and hydrophilic shell have distinct functions. The core provides controlled drug loading and protection, while the shell controls release kinetics and governs bio-distribution. This spatial differentiation of material properties enables simultaneous control over drug release profiles and in vivo behavior.
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
These nanoparticles exhibit increased mechanical stability, controlled and sustained therapeutic compound release, and improved bio-distribution, enabling effective targeted delivery and imaging capabilities.
Implementation Method 1
a population of self-assembled, substantially bi-concaved disc shaped nanoparticles
Implementation Method 2
hydrophobically modifying a branched polymer by covalently conjugating amphiphilic lipids
Implementation Method 3
agitating the inverted micelles in the presence of heat and an aqueous solvent
Data Source
AI summary
The present invention provides nanoparticles, methods of making the nanoparticles, and methods of using the nanoparticles to deliver therapeutic agents and/or imaging agents.