Wearable Patch Adhesive Matrix for Long Wear Without MARSI
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Solution Overview
Problem
Existing wearable patches cause Medical Adhesive Related Skin Injury (MARSI) due to long-term adhesion, and high moisture vapor transmission rates are believed to enhance wear time but result in short wear durations.
Innovation Solution
A flexible nonwoven facestock combined with a hybrid adhesive matrix of acrylic and rubber polymers, achieving a moisture vapor transmission rate less than 400 (g/m²)/day, allows for extended wear times greater than 14 days.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a high moisture vapor transmission rate adhesive matrix is used, then wear time is extended, but skin irritation and MARSI occur
Solution Approach 1:
The patent changes the moisture vapor transmission rate parameter from high (>500 g/m²/day) to moderate (200-400 g/m²/day) to achieve extended wear time while reducing skin irritation. This parameter optimization resolves the contradiction by finding the optimal balance point that provides sufficient moisture management without causing MARSI.
Solution Approach 2:
The patent uses a hybrid adhesive matrix combining acrylic and rubber polymers to achieve both extended wear time and reduced skin irritation. The composite material leverages the complementary properties of acrylic (adhesion, flexibility) and rubber (elasticity, skin compatibility) to resolve the contradiction between durability and skin safety.
2Duration of action of stationary object
If long term bonding to the dermis is achieved, then extended wear time is obtained, but adhesive related skin damage occurs
Solution Approach 1:
The patent modifies the moisture vapor transmission rate parameter to a moderate range (200-400 g/m²/day) that enables sustained bonding for extended periods while preventing the excessive moisture accumulation that leads to MARSI, thus achieving long-term bonding without skin damage.
Solution Approach 2:
The patent designs the adhesive matrix to provide reliable extended wear (at least 14 days) as a single-use application, optimizing performance for the intended wear period while minimizing skin damage risks associated with repeated application and removal cycles.
3Object-affected harmful factors
If high moisture vapor transmission rate is used, then moisture management is improved, but wear duration decreases
Solution Approach 1:
The patent optimizes the moisture vapor transmission rate to a moderate range (200-400 g/m²/day) that provides sufficient moisture management to prevent skin irritation while maintaining adhesive integrity and bonding strength for extended wear durations of at least 14 days.
Solution Approach 2:
The patent creates different functional zones within the adhesive matrix through the hybrid polymer composition, where acrylic components provide adhesion and structural integrity for extended wear, while rubber components provide flexibility and controlled moisture transmission, achieving both good moisture management and prolonged wear duration.
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 combination provides extended wear time without causing MARSI, maintaining adhesion for at least 14 days with improved skin compatibility.
Implementation Method 1
the hybrid adhesive matrix has a moisture vapor transmission rate less than 400 (g/m 2)/day
Data Source
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AI summary
Wearable patches and wearable devices are described. The wearable patch and device include a facestock and an adhesive matrix that may be attached onto the dermis of the wearer for an extended time period.