Topical Adhesive Skin Patch with Opacity Change for Application Timing
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Solution Overview
Problem
Topical adhesive skin patches often fail to provide a consistent application time, leading to insufficient effects when removed too soon or skin issues when left on too long, as users rely on sensory cues rather than precise timing.
Innovation Solution
A topical adhesive skin patch with a resin mesh or porous resin support and an oil-in-water gel base that becomes opaque before application, gradually losing opacity over time due to moisture evaporation, allowing visual determination of the application duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If users rely on sensory decision to determine application time, then the ease of operation is improved, but the reliability of application duration is worsened
Solution Approach 1:
The base material layer is designed to change its optical appearance from opaque to transparent as moisture evaporates during application. This visual transformation provides users with an intuitive, easy-to-observe indicator of application duration, eliminating the need for sensory judgment while ensuring reliable and consistent application timing.
2Loss of information
If the base material layer is made transparent to allow visual monitoring, then the ability to visually ascertain application time is improved, but the ability to maintain emulsion stability is worsened
Solution Approach 1:
The invention utilizes the dynamic parameter change of the base material layer's optical properties during moisture evaporation. The layer transitions from opaque (when moisture-rich and emulsified) to transparent (as moisture evaporates), providing visual feedback while maintaining emulsion stability throughout the application period.
3Illumination intensity
If a resin mesh sheet or porous resin sheet with high light transmittance is used as support, then the ability to visually monitor the base material layer is improved, but the structural integrity may be worsened
Solution Approach 1:
The support uses a resin mesh sheet or porous resin sheet with controlled porosity and high light transmittance (≥80%). The porous structure allows moisture vapor to escape while maintaining mechanical strength, and the high light transmittance enables clear visual monitoring of the base material layer's transparency changes during application.
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
Enables users to visually ascertain the correct termination time, preventing premature removal or prolonged use, thus ensuring effective application and reducing skin issues.
Implementation Method 1
subsequent to application to the skin surface, moisture contained in the base material layer gradually evaporates causing the opacity of the base material layer to decline over time
Implementation Method 2
the base material layer includes an oil-in-water type gel base containing at least water, oil, an emulsifier, and a water-absorbent polymer, such that prior to application to the skin surface, the base material layer is opaque due to emulsification of the base material layer
Data Source
AI summary
In a topical adhesive skin patch provided with a support and a base material layer laminated to one or both sides of the support, or in a topical adhesive skin patch intended to be used by placing only a gel sheet against the skin surface, the base material layer or gel sheet includes an oil-in-water type gel base containing at least water, oil, an emulsifier, and a water-absorbent polymer, such that prior to application to the skin surface, the base material layer or gel sheet is opaque due to emulsification of the base material layer or gel sheet, and subsequent to application to the skin surface, moisture contained in the base material layer or gel sheet gradually evaporates causing the opacity of the base material layer or gel sheet to decline over time, so that decline in opacity over time can be visually ascertained.