Switchable Adhesive Composition for Ostomy Wafer Leakage Prevention
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Solution Overview
Problem
Conventional ostomy devices face challenges with adhesives that flow during storage and application, leading to undesired placement and leakage issues due to their soft or liquid texture, which complicates their integration into ostomy devices.
Innovation Solution
The ostomy device incorporates a switchable adhesive composition that can transition from a low viscosity, flowable state to a higher viscosity, form-stable state, contained within a recess in the adhesive wafer, ensuring secure attachment to the skin and preventing leakage by using a polymer and switch initiator that can be activated by light or moisture, with a backing layer and release liner for easy application and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft or liquid adhesive composition is used, then adhesion performance is improved, but the adhesive flows during storage and application causing placement and leakage issues
Solution Approach 1:
The adhesive composition dynamically changes its properties from a flowable state during application to a stable state during storage. The adhesive transitions from a soft/liquid texture that can conform to skin contours to a more stable form that prevents leakage and maintains placement integrity.
Solution Approach 2:
The adhesive composition changes its physical parameters (viscosity, texture) based on environmental conditions or time. The adhesive starts with lower viscosity for easy application and skin conformability, then transitions to higher viscosity for leakage prevention and stable attachment.
2Ease of operation
If a flowable adhesive is used, then ease of application is improved, but leakage and undesired placement occur
Solution Approach 1:
The adhesive dynamically adjusts its flow characteristics during the application process, being flowable when needed for ease of placement but becoming stable to prevent subsequent leakage.
Solution Approach 2:
The adhesive is formulated to undergo a preliminary change in state after application, transitioning from a flowable state that enables easy placement to a stable state that prevents leakage, ensuring both ease of application and reliability.
3Reliability
If a switchable adhesive composition is used, then adhesion and leakage prevention are improved, but device complexity increases
Solution Approach 1:
The adhesive composition incorporates switchable parameters that allow it to change its physical state in response to environmental conditions or activation, enabling improved adhesion and leakage prevention without requiring complex mechanical switching mechanisms.
Solution Approach 2:
The adhesive composition autonomously switches between states based on environmental triggers (such as moisture, temperature, or pH changes), eliminating the need for external control mechanisms and reducing overall device complexity while maintaining reliable performance.
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 switchable adhesive composition provides quick and effective adhesion to the skin, preventing leakage and ensuring a secure, durable bond, allowing for easy removal without residue, thus enhancing user comfort and device performance.
Implementation Method 1
a polymer and switch initiator that can be activated by light or moisture
Data Source
AI summary
An adhesive wafer adapted to attach a waste collecting bag to a skin surface of a user includes a switchable adhesive composition adapted to be switched from a first liquid state to a second adhesive state by moisture activation of the switch initiator.