Extended Release Plastic Matrix for Transdermal Bio-Active Delivery
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Solution Overview
Problem
Current methods of bio-active agent administration, such as oral and transdermal delivery, face challenges like first-pass metabolism, uneven absorption, and short-acting effects, necessitating a method for extended release of bio-active agents to maintain consistent systemic concentrations over time.
Innovation Solution
Development of an extended release plastic matrix (ERPM) comprising a structural polymer, liquid-binding material, and a carrier liquid, where the bio-active agent is embedded as solid islands within the polymer, allowing for controlled release through the skin over an extended period, driven by a concentration gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If oral administration is used, then the bio-active agent can be easily administered, but first-pass metabolism reduces bioavailability and causes uneven concentration peaks and troughs
Solution Approach 1:
The patent introduces a transdermal adhesive patch as an intermediary delivery system that bypasses the gastrointestinal tract and liver metabolism. The patch applies the bio-active agent directly through the skin, eliminating first-pass metabolism and providing consistent systemic concentration without peaks and troughs associated with oral administration.
Solution Approach 2:
The patent replaces the mechanical swallowing and gastrointestinal absorption process with a transdermal delivery mechanism. The adhesive patch uses skin penetration through adhesive bonding and diffusion, substituting the complex gastrointestinal mechanical system with a simpler transdermal physical process that provides more reliable bioavailability.
2Reliability
If transdermal delivery is used, then bioavailability is increased by circumventing the gastric system, but the delivery duration is short and the patch may be accidentally rubbed or washed off
Solution Approach 1:
The patent divides the transdermal patch into multiple functional layers including an adhesive layer, bio-active agent reservoir, and permeation layer. This segmentation allows each layer to perform its specific function optimally - the adhesive layer provides strong bonding to prevent removal, while the reservoir provides extended release duration, and the permeation layer ensures consistent delivery.
Solution Approach 2:
The patent uses composite material structures combining different polymer matrices (such as polyacrylic acid, carboxymethyl cellulose, or starch-based polymers) with bio-active agents. These composite formulations provide both strong adhesive properties to prevent accidental removal and controlled release mechanisms for extended delivery duration, resolving the contradiction between bioavailability and duration.
3Ease of operation
If creams and lotions are used for transdermal delivery, then the bio-active agent can be applied topically, but they are short-acting and may be accidentally rubbed or washed off
Solution Approach 1:
The patent employs a flexible adhesive patch film that bonds to the skin surface, creating a closed delivery system. This thin film structure prevents the bio-active agent from being accidentally rubbed or washed off, while maintaining flexibility for comfortable wear. The film acts as a reservoir that releases the agent slowly over extended periods, solving the duration problem of creams and lotions.
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 ERPM enables a therapeutically effective, sustained release of bio-active agents for transdermal absorption, providing consistent systemic concentrations for weeks or months without adverse reactions, enhancing the efficacy and duration of treatment.
Implementation Method 1
the carrier liquid is capable of dissolving the bio-active agent at room or body temperature
Implementation Method 2
The skin serves as an effective barrier to microbes and foreign molecules, however, small molecules can diffuse across the skin
Data Source
AI summary
A plastic material for extended release of a bio-active agent, the plastic material comprising a structural polymer, at least one bio-active ingredient embedded within the structural polymer as solid islands, a liquid binding material embedded within the structural polymer as granules, and a carrier liquid absorbed within the liquid-absorbent material. The carrier liquid may be sufficiently non-compatible with the structural polymer so that at least a portion of the carrier liquid is released from the liquid-absorbent material through the structural polymer to an outer surface of the plastic material over a period of time, such as a week or more, a month or more, or about three months. The bio-active agent comprised in the at least one bio-active ingredient may be sufficiently soluble in the carrier liquid at room or body temperature so that the carrier liquid released to the outer surface comprises the bio-active agent in solution.