Adhesive Patch Drug Stability via PVP Complexation
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Solution Overview
Problem
Transdermal drug patches face challenges in maintaining drug content stability over time due to decomposition and bonding between drugs and pressure-sensitive adhesive bases, which can reduce the amount of drug absorbed through the skin.
Innovation Solution
A patch design incorporating a pressure-sensitive adhesive layer with a polymer having a hydroxyl group, a drug, polyvinylpyrrolidone, and a multivalent metal chloride, such as aluminum chloride, to form a stable complex that enhances drug stability and transdermal absorbability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a patch contains a pressure-sensitive adhesive layer with a drug, then the drug can be delivered transdermally, but the drug may decompose or bond with the adhesive base during storage, reducing drug content stability
Solution Approach 1:
Polyvinylpyrrolidone is introduced as an intermediary substance between the drug and the pressure-sensitive adhesive base. It forms a complex with the drug through hydrogen bonding, preventing direct interaction between the drug and adhesive base, thereby preventing drug decomposition and bonding during storage while maintaining transdermal delivery capability
Solution Approach 2:
The pressure-sensitive adhesive layer is designed as a composite material system containing the pressure-sensitive adhesive base, drug, polyvinylpyrrolidone, and multivalent metal chloride. This composite structure creates multiple interaction mechanisms (complex formation, hydrogen bonding, coordination) that stabilize the drug throughout the storage period while enabling effective transdermal delivery
2Productivity
If the transdermal absorbability of a drug is enhanced, then drug efficacy works faster and continuously, but the skin barrier function prevents drug absorption
Solution Approach 1:
The drug is complexed with polyvinylpyrrolidone and multivalent metal chloride, which changes the physical and chemical parameters of the drug (solubility, molecular size, charge distribution). This complexation modifies the drug's interaction with skin barriers, enhancing transdermal absorption while maintaining stability
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 patch achieves improved drug content stability and transdermal absorbability, ensuring effective drug delivery over an extended period without significant reduction in drug content.
Implementation Method 1
one of the reasons is assumed that the drug and the multivalent metal chloride form a complex, which is stabilized by polyvinylpyrrolidone
Implementation Method 2
allows a drug to be absorbed directly from the application surface for treatment
Data Source
AI summary
The present invention provides a patch having a backing and a pressure-sensitive adhesive layer on the backing, wherein the pressure-sensitive adhesive layer contains a pressure-sensitive adhesive base composed of a polymer having a hydroxyl group, a drug, polyvinylpyrrolidone and a multivalent metal chloride.