Reverse Thermal Gel for Sustained Ocular Drug Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current ocular treatments for diseases such as macular degeneration and nerve damage face challenges due to poor bioavailability, rapid elimination, and invasive administration methods, which lead to systemic side effects and frequent dosing requirements, while existing biomaterials for nerve regeneration have shown toxicity and limited efficacy.
Innovation Solution
Development of a novel reverse thermal gel copolymer composition that transitions from a solution to a gel at body temperature, allowing for site-specific, minimally invasive delivery of therapeutic agents, including antiangiogenic agents like bevacizumab, and serving as a scaffold for nerve regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional ocular dosage forms (eye drops, ointments, suspensions) are used, then administration is simple and non-invasive, but bioavailability is poor due to rapid precorneal elimination, normal tears turnover, and conjunctiva absorption
Solution Approach 1:
The patent employs a reverse thermal gel system that transitions from liquid to gel state at body temperature. The copolymer composition is administered as a liquid solution that can be easily instilled into the eye, then undergoes phase transition to form a gel in situ, providing sustained drug release and improving bioavailability while maintaining ease of administration
Solution Approach 2:
The invention changes the physical state parameter of the drug delivery system from solid/semi-solid (conventional ointments and suspensions) to liquid-gel transition system. This parameter change allows the formulation to be administered as a liquid for ease of use, then transforms into a gel to prolong residence time and improve drug availability at the target site
2Reliability
If concentrated medication is administered frequently to manage chronic ocular conditions, then therapeutic effect is maintained, but systemic exposure increases leading to side effects
Solution Approach 1:
The reverse thermal gel acts as an intermediary vehicle that traps and slowly releases the therapeutic agent at the ocular site. The gel matrix serves as a reservoir that controls drug release kinetics, maintaining therapeutic concentrations locally while minimizing systemic absorption and associated side effects
Solution Approach 2:
The gel formulation is designed to pre-establish a sustained release mechanism upon administration. The phase transition to gel state occurs immediately upon contact with ocular tissues, creating a reservoir that automatically provides controlled drug release over time, eliminating the need for frequent dosing and reducing cumulative systemic exposure
3Reliability
If intravitreal drug injections are used to maximize drug concentrations in the eye, then bioavailability is improved and systemic exposure is reduced, but the procedure becomes invasive and carries risks of complications
Solution Approach 1:
The reverse thermal gel system transitions from liquid to gel state after administration, allowing the drug to be delivered as a liquid (avoiding injection complications) and then form a gel in situ to maintain high local concentrations. This phase transition approach achieves the pharmacokinetic benefits of intravitreal injection without the invasive procedure and associated risks
4Reliability
If existing biomaterials for nerve regeneration are used, then nerve repair is attempted, but toxicity is observed and efficacy is limited
Solution Approach 1:
The patent uses a composite copolymer system combining hydrophilic and hydrophobic blocks with specific functional groups. This composite material structure provides both the mechanical properties needed for nerve regeneration support and biocompatibility, eliminating the toxicity issues observed with previous biomaterials while maintaining regenerative efficacy
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 reverse thermal gel composition provides sustained release of therapeutic agents, reduces systemic exposure, and promotes nerve regeneration with biocompatibility and controlled degradation, offering a more effective and less invasive treatment option for ocular diseases and nerve damage.
Implementation Method 1
the copolymer composition undergoes phase transition from liquid solution to gel at body temperature
Implementation Method 2
The reverse thermal gel composition provides sustained release of therapeutic agents
Data Source
AI summary
Biodegradable triblock copolymer compositions are provided which are useful in tissue engineering and drug delivery. The copolymers are reverse thermal gels in that when heated from a lower temperature to a higher temperature, they gel. These gels are useful in drug delivery when complexed with an active agent. For example the compositions can be used for intraocular injection of active agents, such as anti-angiogenic agents for treatment of a maculopathy or retinitis.