Injectable Composite Hydrogel for Controlled Antibody Release
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Solution Overview
Problem
Existing hydrogel-based drug delivery systems experience rapid, uncontrolled 'burst release' of drug molecules due to high permeability, leading to reduced efficacy and potential systemic side effects, especially at high drug concentrations.
Innovation Solution
A composite hydrogel system comprising a thermoresponsive polymer, such as methylcellulose, forms a depot at body temperature, interacting with alginate microparticles to create a semi-interpenetrating network that controls and sustains the release of high-concentration antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hydrogel network with high permeability is used, then injectability and biocompatibility are improved, but drug release becomes rapid and uncontrolled
Solution Approach 1:
The patent combines two different polymer networks (first and second polymers) with distinct properties into a composite hydrogel system. The first polymer provides injectability and biocompatibility, while the second polymer contributes to controlled drug release, creating a material that exhibits both desired properties simultaneously.
Solution Approach 2:
The patent creates regions with different polymer compositions and mesh sizes within the hydrogel. By localizing specific polymer types in different areas, the system achieves spatial variation in drug release rates, allowing controlled release in certain regions while maintaining injectability in others.
2Quantity of substance
If high drug concentration is loaded in the hydrogel, then therapeutic efficacy is improved, but burst release and systemic side effects increase
Solution Approach 1:
The patent changes the physical and chemical parameters of the hydrogel network, including mesh size, crosslinking density, and polymer composition, to match the drug concentration. By adjusting these parameters, the system can accommodate high drug loads while maintaining controlled release kinetics and preventing burst release.
Solution Approach 2:
The patent introduces an intermediary polymer network that acts as a barrier between the high-concentration drug and the surrounding environment. This intermediary structure modulates drug release, preventing sudden release and reducing systemic side effects while maintaining high therapeutic efficacy.
3Device complexity
If a single polymer network is used, then system complexity is reduced, but sustained controlled release cannot be achieved
Solution Approach 1:
The patent divides the single polymer network into multiple segmented networks (first and second polymers), each with specific functions. This segmentation allows independent optimization of different release phases, enabling sustained controlled release over extended periods while keeping each individual polymer component relatively simple.
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 system achieves sustained release of antibodies over hours to months, maintaining therapeutic efficacy while reducing systemic side effects and allowing for self-administered, high-concentration formulations.
Implementation Method 1
a first polymer capable of gelling when exposed to a temperature greater than or equal to 20 degrees Celsius
Implementation Method 2
the first polymer comprises a first hydrophobic domain, the first polymer capable of gelling when exposed to a temperature greater than or equal to 20 degrees Celsius; and a plurality of particles comprising a second polymer and an active substance, wherein: the second polymer comprises a second hydrophobic domain, the first hydrophobic domain is capable of interacting with the second hydrophobic domain
Data Source
AI summary
Systems, compositions, and methods related to injectable hydrogels are generally described. In some embodiments, a composition comprises a first polymer and a plurality of particles comprising a second polymer capable of forming a hydrogel at elevated temperatures, such as body temperature. The plurality of particles (e.g., hydrogel particles) may comprise an active substance, such as a biological material and/or a therapeutic agent. Together, the first polymer and the second polymer may interact with each other (e.g., the first polymer may interpenetrate the second polymer, and/or the first polymer may cross-link with the second polymer) at elevated temperatures to form a hydrogel. Interactions between the first and second polymer, and/or between hydrophobic domains thereof, may facilitate the relatively slow and/or controlled release of the active substance. In some embodiments, the plurality of particles may have advantageously high loadings of biological materials (e.g., antibodies, proteins, peptides).