Microstructure Array for Poorly Soluble Drug Delivery
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Solution Overview
Problem
Current methods for transdermal drug delivery using microneedle arrays are ineffective for poorly soluble therapeutic agents due to their low solubility in aqueous solvents, leading to uneven distribution and poor delivery efficiency.
Innovation Solution
A microstructure array comprising a biodegradable distal layer with a poorly soluble therapeutic agent and polymers soluble in both aqueous and organic solvents, along with solubility enhancers like D-α tocopheryl polyethylene glycol 1000 succinate and Kolliphor, is used, which is fabricated using a solvent mixture and dried under controlled conditions to form a stable and effective delivery system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water soluble polymers are used to form microneedle arrays, then the arrays can be easily formed with good mechanical strength, but the delivery efficiency of poorly soluble therapeutic agents is poor
Solution Approach 1:
The microneedle array is segmented into multiple functional layers: a proximal layer containing the poorly soluble therapeutic agent and a distal layer containing water-soluble polymer. This segmentation allows each layer to perform its specific function - the proximal layer delivers the drug while the distal layer provides mechanical integrity and facilitates insertion, resolving the contradiction between ease of manufacture and delivery efficiency.
Solution Approach 2:
The microneedle array uses composite materials combining poorly soluble therapeutic agents with water-soluble polymers in a layered structure. This composite approach allows the array to simultaneously achieve good mechanical strength from the polymer layers and effective drug delivery from the proximal layer, addressing both ease of manufacture and delivery efficiency requirements.
2Adaptability or versatility
If poorly soluble therapeutic agents are incorporated into water soluble polymer matrices, then transdermal delivery can be achieved, but the distribution uniformity and delivery efficiency are reduced
Solution Approach 1:
The array is segmented into a proximal layer for drug incorporation and a distal layer for structural support. This segmentation ensures that poorly soluble therapeutic agents are concentrated in the proximal layer where they can be effectively delivered, while the distal layer maintains uniform structure and mechanical properties, resolving the contradiction between adaptability and manufacturing precision.
Solution Approach 2:
Different regions of the microneedle array have different qualities: the proximal layer is optimized for drug loading with poor solubility characteristics, while the distal layer is optimized for mechanical strength and water solubility. This local quality differentiation allows the array to simultaneously achieve good drug delivery adaptability and manufacturing precision.
3Duration of action of stationary object
If biodegradable polymers are used for microneedle arrays, then the arrays can be easily degraded in the body, but the mechanical strength required for skin penetration is insufficient
Solution Approach 1:
The microneedle array uses composite materials where the distal layer comprises biodegradable polymer providing mechanical strength for skin penetration, while the proximal layer contains the therapeutic agent. This composite structure allows the array to maintain sufficient mechanical strength during insertion and then degrade over time to release the drug, resolving the contradiction between degradation time and mechanical strength.
Solution Approach 2:
The array is segmented into a proximal drug-containing layer and a distal structural layer. The distal layer is specifically designed with biodegradable polymer that provides the necessary mechanical strength for insertion and then degrades controllably, while the proximal layer handles drug delivery. This segmentation allows independent optimization of mechanical strength and degradation characteristics.
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 solution enables efficient transdermal delivery of poorly soluble therapeutic agents with high purity and stability, maintaining a significant portion of the active agent in the distal layer for effective skin penetration and bioavailability.
Implementation Method 1
The distal layer is made of a biodegradable, water soluble polymer and dissolves easily when inserted into the subject's skin
Implementation Method 2
The distal layer comprises at least one therapeutic agent that is poorly soluble in water or an aqueous solvent and one or more solubility enhancers
Data Source
AI summary
A microprojection array comprising an approximately planar base and a plurality of microprojections, wherein the array comprises a therapeutic agent that is poorly soluble in water or an aqueous solvent.