Cooling Analgesic Patch Adhesive Layer for Sustained Release
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Solution Overview
Problem
Existing patch-type coolants fail to maintain a cool feeling effect and analgesic effect for an extended duration, lacking additional benefits such as anti-inflammatory effects.
Innovation Solution
A patch comprising a nonwoven fabric with an adhesive layer containing a cool feeling agent, local anesthetic, and/or anti-inflammatory analgesic, with a thickness of 0.50 mm or more, and specific component ratios to enhance durability of these effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the adhesive layer is made thicker to maintain cool feeling and analgesic effects for longer, then the duration of action is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by optimizing the adhesive layer thickness to a specific range (0.50-1.50 mm) and controlling the gel substrate content (5-50% by weight) to achieve the desired duration of effect without excessive complexity. This quantitative parameter optimization resolves the contradiction between extended duration and structural simplicity.
Solution Approach 2:
The patent uses composite materials by combining a gel substrate with specific polymers (sodium polyacrylate, polyacrylic acid, or polyvinyl alcohol) to create an adhesive layer that provides both sustained release functionality and appropriate adhesion strength. This composite approach enables long-duration effect while maintaining manufacturability through well-established material combinations.
2Duration of action of moving object
If the adhesive layer thickness is increased to enhance sustained release, then the duration of action is improved, but the adhesive force may become excessive or difficult to control
Solution Approach 1:
The patent resolves this contradiction by precisely controlling multiple parameters: adhesive layer thickness (0.50-1.50 mm), gel substrate content (5-50% by weight), and polymer content (5-50% by weight). This multi-parameter optimization ensures that the adhesive force remains within the desirable range of 10-100 gf/cm² while achieving sustained release over the required duration.
Solution Approach 2:
The patent applies local quality by creating an infiltration layer where the adhesive layer penetrates into the nonwoven fabric support (0.001-0.500 mm thickness). This localized infiltration provides enhanced anchoring and controlled adhesive force at the interface, while the bulk adhesive layer maintains sustained release properties.
3Device complexity
If the adhesive layer is made thinner for simpler structure, then the device complexity is reduced, but the duration of cool feeling and analgesic effect decreases
Solution Approach 1:
The patent demonstrates that by optimizing parameters within specific ranges (adhesive layer thickness 0.50-1.50 mm, gel substrate content 5-50% by weight), it is possible to achieve both structural simplicity and extended duration of effect. The lower bound of 0.50 mm ensures sufficient duration while the upper bound maintains structural simplicity.
Solution Approach 2:
The patent employs self-service through the infiltration layer that automatically forms as the adhesive layer penetrates into the nonwoven fabric support. This self-infiltration process creates enhanced anchoring and sustained release without requiring additional complex structures or manufacturing steps.
4Duration of action of moving object
If the adhesive layer thickness is increased to improve sustained release, then the duration of action is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent establishes a practical thickness range (0.50-1.50 mm) that balances sustained release performance with manufacturing feasibility. This range is sufficiently thick to provide duration but not so thick as to require extreme manufacturing precision, making it suitable for conventional manufacturing processes.
Solution Approach 2:
The patent reduces overall manufacturing precision requirements by localizing the critical function to the infiltration layer (0.001-0.500 mm), which forms automatically during application. The bulk adhesive layer can be applied with less precision since the infiltration process self-regulates the interface 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 patch maintains a cool feeling and analgesic effect for a longer time, with improved durability and reduced irritation, while preventing uneven component permeation and adhesive shrinkage.
Implementation Method 1
sustained release of the active ingredients
Implementation Method 2
sustained release of the active ingredients
Implementation Method 3
cools the portion where the patch is attached by the heat of vaporization of water
Data Source
AI summary
A patch (10) comprising: a nonwoven fabric (1); and an adhesive layer (2) on the nonwoven fabric (1), wherein the adhesive layer (2) comprises a cool feeling agent, a local anesthetic and/or an anti-inflammatory analgesic, and water, and the adhesive layer (2) has a maximum thickness of 0.50 mm or more.