Thermal Gelling Anionic Polymer Blend for Drug Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current polymer matrices for drug delivery lack a fast gelling rate and targeted, sustained release capabilities, especially for delivering therapeutic agents across the blood-spinal cord barrier, and often form solid gels at higher nonionic polymer concentrations, limiting their effectiveness.
Innovation Solution
A polymer matrix comprising an inverse thermal gelling polymer and an anionic gelling polymer, such as methylcellulose and hyaluronic acid, which combines to form a fast-gelling, shear-thinning formulation that can be injected for localized delivery, allowing for sustained release of therapeutic agents, including those that typically do not cross the blood-spinal cord barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If nonionic polymer concentration is increased above 1.0%, then drug loading capacity is improved, but solid gel formation occurs limiting delivery
Solution Approach 1:
The patent changes the chemical nature of the polymer from nonionic to anionic, which fundamentally alters the gelation behavior. Anionic polymers do not form solid gels at high concentrations like nonionic polymers do, thereby maintaining injectability while enabling higher drug loading capacities.
Solution Approach 2:
The patent creates a composite polymer system combining anionic polymer matrices with therapeutic agents. This composite approach allows optimization of both drug loading capacity and deliverability by selecting appropriate anionic polymers that do not exhibit the solid gel formation problem of nonionic polymers at high concentrations.
2Reliability
If inverse thermal gelling polymer is used alone, then drug delivery is achieved, but gelling rate is too slow for targeted delivery
Solution Approach 1:
The patent introduces cations as intermediary substances that mediate between the inverse thermal gelling polymer and the desired fast gelling outcome. The cations accelerate the gelation process by interacting with the polymer chains, enabling rapid gel formation at the injection site while maintaining the polymer's drug delivery effectiveness.
3Duration of action of moving object
If polymer matrix is designed for sustained release, then therapeutic effect is improved, but drug distribution and release rates need optimization
Solution Approach 1:
The patent optimizes release rates by changing parameters such as polymer molecular weight, concentration, and cross-linking density. These parameter adjustments allow control over the mesh size and degradation rate of the polymer matrix, thereby tuning the drug release kinetics to achieve both sustained release and optimized distribution.
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 polymer matrix achieves rapid gelation and targeted delivery of therapeutic agents, minimizing systemic toxicity and side effects, with enhanced drug distribution and controlled release rates, as demonstrated by its effectiveness in delivering anesthetics, analgesics, and other pharmaceuticals to the intrathecal space.
Implementation Method 1
a inverse thermal gelling polymer and an anionic gelling polymer in a solid gel formulation. The polymer matrix has a faster rate of gelling than each component separately.
Implementation Method 2
the anionic gelling polymer possesses shear thinning properties that facilitate the return of the polymer matrix to its original viscosity and solid gel state after shearing faster than the inverse thermal gelling polymer alone
Data Source
AI summary
A physical blend of inverse thermal gelling and shear-thinning, thixotropic polymers that has a lower gelation temperature than the thermal gelling polymer alone is provided. The blend results in an injectable hydrogel that does not flow freely at room temperature, but is injectable due to its shear-thinning properties. The thermal-gelling properties of the polymer promote a more mechanically stable gel at body temperature than at room temperature. The polymer matrix gel has inherent therapeutic benefit and can also be used as a drug delivery vehicle for localized release of therapeutic agents.