Medical Adhesive Patch Barrier Layer Water Resistance
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Solution Overview
Problem
Existing medical adhesive patches lack sufficient water resistance and adhesiveness, leading to peeling issues when exposed to bath water or prolonged use, as they are not designed for such environments.
Innovation Solution
A medical adhesive patch with a support film containing a barrier layer made of polyvinyl alcohol and montmorillonite, where the degree of saponification of polyvinyl alcohol is between 70% and 95.5%, and the montmorillonite content is between 2 wt% and 22 wt%, providing enhanced water resistance and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas barrier film with montmorillonite and water-soluble polymer is used, then barrier property is improved, but adhesiveness and water resistance deteriorate
Solution Approach 1:
The patent changes the key parameter of the water-soluble polymer from generic to specifically polyvinyl alcohol with controlled degree of saponification (70-95.5%) and molecular weight (5,000-50,000). This parameter optimization ensures the barrier layer maintains sufficient adhesiveness to the support film and barrier coating while providing adequate water resistance for prolonged skin attachment including during bathing activities.
Solution Approach 2:
The patent creates a composite barrier layer by combining polyvinyl alcohol (with specific saponification degree and molecular weight) and montmorillonite in optimized proportions. This composite structure provides both the barrier properties needed to prevent medicine leakage and the adhesiveness required to maintain attachment on skin during water exposure and prolonged wear.
2Duration of action of stationary object
If the medical adhesive patch is designed for long-term attachment (one week), then duration of action is improved, but water resistance and adhesiveness deteriorate due to exposure to bath water
Solution Approach 1:
The patent optimizes multiple parameters of polyvinyl alcohol including degree of saponification (70-95.5%), molecular weight (5,000-50,000), and content ratio with montmorillonite (80:20 to 20:80). These parameter optimizations enable the adhesive layer to maintain both strong skin adhesion and water resistance throughout the one-week attachment period, even during bathing activities.
Solution Approach 2:
The patent develops a composite adhesive system combining polyvinyl alcohol with montmorillonite clay particles. This composite structure provides enhanced water resistance while maintaining adhesiveness, allowing the patch to remain securely attached to skin for prolonged periods including exposure to water during bathing.
3Reliability
If polyvinyl alcohol with high degree of saponification is used, then water resistance is improved, but adhesiveness deteriorates
Solution Approach 1:
The patent identifies and optimizes the degree of saponification of polyvinyl alcohol as a critical parameter, specifying a range of 70-95.5%. This optimized range balances the competing requirements: higher saponification provides better water resistance while maintaining sufficient adhesiveness for secure skin attachment during prolonged wear and water exposure.
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 excellent adhesiveness and water resistance, preventing peeling and ensuring effective drug delivery over a week-long period, even with elongation, by suppressing the transition of plasticizers and medicines, thus improving patient care and reducing the need for frequent patch changes.
Implementation Method 1
the medical adhesive patch having a degree of saponification of the polyvinyl alcohol is equal to or more than 70 % and equal to or less than 95.5 %... it is preferable to have excellent water resistance
Implementation Method 2
A tape in which an adhesive layer is formed on one surface of a sheet-shaped or film-shaped support is widely used... it is preferable that the medical adhesive patch resist attachment over a period of about one week
Implementation Method 3
by suppressing the transition of plasticizers and medicines
Data Source
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AI summary
A medical adhesive patch includes: a support film including a barrier layer which contains polyvinyl alcohol and a layered inorganic compound, and which is laminated on one surface of a support including polyurethane; an adhesive layer which contains a medicine, and which is laminated on the barrier layer of the support film, a degree of saponification of the polyvinyl alcohol is equal to or more than 70 % and equal to or less than 95.5 %.