Ostomy Bag Filter Adhesive Webbing for Odor Control
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Solution Overview
Problem
Existing ostomy bags with filters face issues of material damage and reduced effectiveness due to direct welding or adhesive barriers, leading to potential leakage and reduced odor absorption.
Innovation Solution
A filter comprising a backing layer, an odour-adsorbing material layer, a hydrophobic membrane layer, and a layer of adhesive webbing with distinct fine lines, allowing secure adhesion to the ostomy bag while permitting gas permeation through the webbing gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If direct welding of the filter to the inner layer of the ostomy bag is used, then secure adhesion is achieved, but material damage and leakage paths occur
Solution Approach 1:
An adhesive layer is introduced as an intermediary substance between the filter and the ostomy bag inner layer. This adhesive layer provides secure bonding while being gentler on the materials than direct welding, preventing damage to the inner layer material and maintaining bag integrity without creating leakage paths.
Solution Approach 2:
The bonding method is changed from thermal welding to chemical adhesion. This parameter change in the bonding mechanism allows for secure attachment of the filter while avoiding the high temperatures and mechanical stress of welding that cause material damage and compromise bag integrity.
2Reliability
If adhesive is used to affix the filter, then material damage is minimized, but the adhesive acts as a barrier to gas permeation
Solution Approach 1:
A porous hydrophobic membrane layer is used in the filter assembly. This membrane allows waste gases to permeate through it while maintaining the adhesive bond to the bag. The porous structure provides gas permeation pathways that bypass the adhesive layer, preventing the adhesive from acting as a complete barrier to gas flow.
Solution Approach 2:
The filter assembly uses a composite structure combining adhesive material with a porous hydrophobic membrane. This composite design allows the adhesive to provide bonding while the porous membrane provides gas permeation pathways, achieving both secure attachment and effective gas flow without the adhesive acting as a complete barrier.
3Strength
If a dense adhesive layer is used, then secure bonding is achieved, but odor absorption effectiveness is reduced due to blocked gas flow
Solution Approach 1:
The porous hydrophobic membrane layer provides gas permeation pathways that maintain odor absorption effectiveness. Gas can flow through the porous structure to reach the activated carbon layer for odor adsorption, while the adhesive provides bonding. This prevents the adhesive from blocking gas flow and maintaining odor absorption efficiency.
Solution Approach 2:
The composite structure of adhesive plus porous hydrophobic membrane allows simultaneous achievement of secure bonding and effective odor absorption. The porous membrane ensures gas can reach the odour-adsorbing material while the adhesive provides the necessary bond strength, preventing the adhesive from blocking gas flow.
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 solution minimizes material damage and enhances odor absorption by allowing gas permeation through the adhesive webbing, preventing leakage and improving the filter's effectiveness in reducing odor release.
Implementation Method 1
a layer of adhesive webbing, comprising distinct fine lines of adhesive
Implementation Method 2
a hydrophobic membrane layer
Implementation Method 3
a layer of odour-adsorbing material
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A filter for an ostomy bag comprises a backing layer, a layer of odour-adsorbing material, a hydrophobic membrane layer, and a layer of adhesive webbing.