Shear-Thinning Fluid Gel Compositions for Ocular Drug Delivery
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Solution Overview
Problem
Current fluid gel compositions for biomedical applications lack tuneable chemical properties and programmable release mechanisms, limiting their versatility as scaffolds for therapeutic applications, particularly in ocular and topical therapies.
Innovation Solution
A method for forming shear-thinning fluid gel compositions involving a microgel particle-forming polymer with cross-linkable functional groups, dissolved in an aqueous medium and mixed with a radical initiator, undergoes shear-induced gelation, resulting in a composition that reversibly changes viscosity and elastic modulus under shear stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional fluid gel compositions are used, then they provide basic gel structure, but they lack tuneable chemical properties and programmable release mechanisms
Solution Approach 1:
The patent applies parameter changes by systematically varying polymer concentration (0.5-20% w/v), molecular weight, cross-linking density, and composition ratios to achieve tuneable chemical properties. This allows precise control over gelation kinetics, mechanical strength, and therapeutic release profiles, transforming conventional fixed-property gels into adaptable platforms for different therapeutic applications.
Solution Approach 2:
The patent employs composite materials by combining multiple polymer types (natural polysaccharides like alginate and hyaluronic acid with synthetic polymers like PEG), cross-linking agents, and therapeutic agents within a single gel matrix. This composite approach enables simultaneous achievement of structural integrity, chemical tunability, and programmable release mechanisms.
2Ease of operation
If shear-thinning fluid gel compositions are formulated, then they enable improved delivery and controlled release of therapeutics, but they require complex processing and formulation
Solution Approach 1:
The patent implements dynamics by formulating gels with shear-thinning properties that allow the material to transition between solid-like and fluid-like states. At rest, the gel maintains a structured network for stable therapeutic delivery, while under shear stress (during injection or application), the network temporarily breaks down to enable flow, then self-heals afterward. This dynamic behavior simplifies delivery procedures while maintaining formulation effectiveness.
Solution Approach 2:
The patent utilizes phase transitions by designing gels that undergo sol-gel transitions responsive to environmental cues such as temperature, pH, or ionic strength. This allows the formulation to transition from a liquid state during administration to a gel state at the application site, enabling controlled release without complex manufacturing processes.
3Reliability
If polysaccharide-based fluid gels are used, then they provide biocompatibility, but they have limited chemical functionality for programmable release
Solution Approach 1:
The patent introduces intermediary cross-linking agents and functional molecules that bridge the biocompatible polysaccharide matrix with programmable release mechanisms. These intermediaries include cross-linkers with responsive bonds (e.g., disulfide, hydrazone) that can be triggered by specific biological cues, enabling controlled therapeutic release while maintaining the biocompatibility of the natural polysaccharide framework.
Solution Approach 2:
The patent modifies polysaccharide parameters by controlling molecular weight, degree of sulfation, acetylation, or branching to enhance both biocompatibility and chemical functionality. These parameter adjustments allow the natural polysaccharides to exhibit improved mechanical properties and enhanced capacity for programmable release while retaining their inherent biocompatibility.
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 resulting fluid gel compositions exhibit pseudo-solid properties at rest and flow under shear, enabling effective delivery and controlled release of therapeutics, such as in ocular applications for glaucoma treatment and scarring inhibition, with improved biocompatibility and reduced cytotoxicity.
Implementation Method 1
mixing the polymer solution formed in step b) with a radical initiator; and stirring the mixture until gelation is complete
Implementation Method 2
wherein the viscosity and the elastic modulus of the shear-thinning fluid gel composition reversibly reduce when the gel is exposed to shear
Data Source
AI summary
Disclosed are methods for forming shear-thinning fluid gel compositions comprising a microgel particle-forming polymer dispersed in an aqueous medium. The viscosity of the fluid gel compositions reduces when the gel is exposed to shear. Also disclosed are shear-thinning fluid gel compositions obtained by such methods, and medical uses of such compositions.