Adhesive Skin Patch with Dynamic Tensile Properties for Scar Prevention
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Solution Overview
Problem
Conventional hydrocolloid adhesive skin patches have low followability to the skin and short-term adhesion issues due to insufficient suppression of skin elongation, which is a concern for preventing scars and keloids.
Innovation Solution
An adhesive skin patch with a support layer and pressure-sensitive adhesive layer, where the 1% tensile load is 13 N/25 mm or less and the 10% tensile load is 18 N/25 mm or more and 95 N/25 mm or less, providing excellent followability and long-term adhesion while suppressing skin elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support layer is made rigid to suppress skin elongation, then the ability to reduce external forces on wounds is improved, but the followability to skin contours deteriorates
Solution Approach 1:
The support layer is designed with dynamic mechanical properties that allow it to adapt its stiffness based on applied stress. At low stress levels (1% tensile load), the material exhibits high elasticity to follow skin contours, while at higher stress levels (10% tensile load), it becomes stiffer to suppress elongation. This dynamic response resolves the contradiction between followability and elongation suppression.
Solution Approach 2:
The invention changes the mechanical parameters of the support layer by specifying precise tensile load ranges (1% tensile load: 1.5-15 N/25mm, 10% tensile load: 18-95 N/25mm). These parameter specifications enable the material to transition between compliant and restrictive states, simultaneously achieving good followability and effective elongation suppression.
2Adaptability or versatility
If the support layer is made highly elastic to follow skin movements, then the followability is improved, but the ability to suppress skin elongation deteriorates
Solution Approach 1:
The support layer exhibits dynamic mechanical behavior where its effective stiffness changes with the magnitude of applied stress. During normal skin movements, the material remains highly elastic to maintain followability, but when subjected to elongation forces, it activates its strength properties to suppress stretching. This dynamic characteristic allows simultaneous achievement of both followability and elongation suppression.
3Duration of action of moving object
If the adhesive skin patch is designed for long-term adhesion, then the duration of action is improved, but the initial followability to skin may deteriorate
Solution Approach 1:
The invention optimizes the mechanical parameters of the support layer to balance initial followability with long-term adhesion performance. By controlling the 1% and 10% tensile loads within specific ranges, the material maintains sufficient elasticity for skin conformity while providing adequate strength for sustained adhesion over time, preventing both premature detachment and skin damage.
Data Source
Figure 1~2
AI summary
An object of the present invention is to provide an adhesive skin patch which can suppress elongation of the skin, excellent in followability to the skin, is capable of being adhered for a long time for covering wound or for protecting post-surgical wound, in particular, an adhesive skin patch for healing wounds, for treating scars or for preventing formation of scars and keloids. It is also an object of the present invention to provide a support layer for an adhesive skin patch which is suitable for making the above-mentioned adhesive skin patch. The present invention is directed to an adhesive skin patch for covering wound or for protecting post-surgical wound, which comprises a support layer and a pressure-sensitive adhesive layer provided on one surface of the above-mentioned support layer, wherein a 1% tensile load of the above-mentioned adhesive skin patch in a machine direction and a cross machine direction of 13 N/25 mm or less, and a 10% tensile load of the same of 18 N/25 mm or more and 95 N/25 mm or less.