Thermally-Responsive Triblock Bottlebrush Copolymers for Drug Delivery
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Solution Overview
Problem
Current polymer-based extended release systems for therapeutic agents lack control over the place and duration of drug release, particularly in response to physiological conditions such as temperature, limiting their effectiveness in biomedical applications.
Innovation Solution
Development of thermally-responsive triblock bottlebrush copolymers that self-assemble into particles or hydrogels, which undergo a sol-gel transition at physiological temperature, allowing for controlled release of therapeutic agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional polymer-based extended release systems are used, then therapeutic agents can be released over an extended period, but control over the place and duration of drug release is limited
Solution Approach 1:
The patent applies parameter changes by incorporating thermally-responsive blocks (e.g., poly(N-isopropylacrylamide) with LCST around 32-37°C) into the bottlebrush copolymer structure. This allows the polymer to undergo sol-gel transition at physiological temperature, enabling controlled drug release in response to temperature changes in the body. The thermally-responsive parameter enables the system to adapt its drug release behavior based on physiological conditions.
Solution Approach 2:
The patent implements dynamics by designing bottlebrush copolymers that can dynamically transition between sol and gel states in response to temperature changes. The copolymers self-assemble into micelles or hydrogels that can reversibly change their structural state, allowing dynamic control over drug release kinetics and location based on the physiological environment.
2Adaptability or versatility
If polymers are designed to exhibit stimulus-responsive behavior, then control over place and duration of drug release is improved, but the system complexity increases
Solution Approach 1:
The patent uses composite materials by combining different polymeric blocks with distinct functions into a single bottlebrush copolymer architecture. The copolymer comprises thermally-responsive blocks (e.g., poly(N-isopropylacrylamide)), biodegradable blocks (e.g., polylactic acid, polyglycolic acid), and hydrophilic blocks (e.g., polyethylene glycol). This composite structure integrates multiple functionalities (temperature response, biodegradation, steric stabilization) into one molecular design, reducing the need for separate components.
Solution Approach 2:
The patent applies segmentation by dividing the bottlebrush copolymer into distinct functional blocks along the backbone. Each block serves a specific purpose: thermally-responsive blocks for temperature-triggered assembly/disassembly, biodegradable blocks for controlled degradation and sustained release, and hydrophilic blocks for solubility and steric stabilization. This segmented architecture allows independent optimization of each function while maintaining overall system simplicity.
3Stability of the object's composition
If high molecular weight and high sidechain grafting density are used, then self-assembly into well-defined structures with large domain sizes is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by creating bottlebrush copolymers with high sidechain grafting density and long sidechains only in specific regions where needed for self-assembly, while keeping other regions of the polymer more simple. The segmented block architecture allows high grafting density in thermally-responsive blocks for micelle formation, while biodegradable and hydrophilic blocks have optimized but lower grafting densities, reducing overall synthesis 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 thermally-responsive triblock bottlebrush copolymers provide a controlled and sustained release of therapeutic agents, enhancing their efficacy and biocompatibility, particularly suitable for biomedical applications like drug delivery and tissue repair.
Implementation Method 1
which undergo a sol-gel transition at physiological temperature
Implementation Method 2
thermally-responsive triblock bottlebrush copolymers that self-assemble into particles or hydrogels
Implementation Method 3
triblock bottlebrush copolymers which can be used in the formulation of such materials
Data Source
AI summary
Materials (e.g., particles, hydrogels) that provide extended release of one or more therapeutic agents are useful platforms for drug delivery. In part, the present invention relates to new triblock (ABC) bottlebrush copolymers which can be used in the formulation of particles and hydrogels for the extended release of therapeutic agents. In certain embodiments, the triblock bottlebrush copolymers, particles, and hydrogels described herein are thermally-responsive and gel at physiological temperature (e.g., upon administration to a subject), providing injectable and/or implantable gels which can be used for extended release drug delivery. The present invention also provides methods for extended release drug delivery, and methods of treating and/or preventing a disease or conditions in a subject, using the inventive copolymers, particles, and hydrogels. In addition, the present invention provides methods of preparing the triblock bottlebrush copolymers described herein.