Fentanyl Transdermal Patch Sulfur Antioxidant Stability
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Solution Overview
Problem
Transdermal patches containing fentanyl or its salts face challenges in maintaining drug stability and transdermal absorbability over time, with existing solutions not adequately preventing drug degradation.
Innovation Solution
Incorporating an antioxidant with a sulfur atom, such as 2-mercaptobenzimidazole or sodium metabisulfite, into the adhesive layer of the patch, along with a rubber-based adhesive and other additives like fatty acid esters and phenolic antioxidants, to enhance temporal stability without compromising transdermal absorbability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antioxidants (tocopherol, ascorbic acid, phenolic antioxidants) are used in the adhesive layer, then transdermal absorbability is maintained, but temporal stability of fentanyl deteriorates due to drug degradation over time
Solution Approach 1:
The patent changes the chemical parameter of the antioxidant by selecting compounds containing sulfur atoms (such as thiodiphenylol, tetrakis(hydroxymethyl)pyrophosphite, and sodium metabisulfite) instead of conventional antioxidants. This parameter change in the antioxidant's chemical structure provides superior protection against fentanyl degradation while maintaining transdermal absorbability.
Solution Approach 2:
The patent creates a composite adhesive layer system combining the adhesive base material with specific antioxidants containing sulfur atoms. This composite formulation synergistically maintains both the adhesive properties necessary for transdermal delivery and the chemical stability of fentanyl over time, resolving the contradiction between maintainability and stability.
2Stability of the object's composition
If hindered phenolic antioxidants are used to inhibit precipitation, then drug precipitation is prevented, but drug degradation still occurs reducing temporal stability
Solution Approach 1:
The patent changes the functional parameter of the antioxidant from mere precipitation inhibition to comprehensive stability protection by using sulfur-containing compounds that can prevent both precipitation and degradation through their unique chemical properties, thereby achieving temporal stability while maintaining composition stability.
3Adaptability or versatility
If multiple antioxidant types are combined (tocopherol, ascorbic acid, phenolic antioxidants), then antioxidant coverage is increased, but drug degradation is not sufficiently prevented
Solution Approach 1:
The patent extracts and focuses on the critical functional property of sulfur-containing antioxidants rather than using a broad mixture of different antioxidant types. By selecting specifically for sulfur-containing compounds, the patent achieves superior degradation prevention with a more targeted and effective antioxidant system.
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 effectively prevents drug degradation over time while maintaining high transdermal absorbability, resulting in improved temporal stability and clinical utility compared to conventional patches.
Implementation Method 1
the adhesive layer contains, as an antioxidant, an antioxidant having a sulfur atom in its molecule... more reliably preventing the drug from degrading over time
Data Source
AI summary
A patch comprises a backing and an adhesive layer laminated on at least one surface of the backing, in which the adhesive layer contains at least one selected from the group consisting of fentanyl and salts thereof, and contains an adhesive base material and an antioxidant having a sulfur atom in its molecule.