Ostomy Pouch Stress Displacement Bonding Layer
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Solution Overview
Problem
The existing ostomy pouch assemblies face challenges in maintaining a secure seal due to stress risers at the bonding points between the foam intermediate layer and the ostomy bag, leading to potential tearing and leakage when tensile or shear forces are applied, especially when the bag is bonded directly to a planar foam layer without a rigid substrate.
Innovation Solution
Incorporating a stress displacement or bonding layer between the intermediate foam layer and the ostomy bag receptacle, with the bonding region's outer peripheral edge located inwardly of the bonding layer's edge, distributing stress away from the edge contact and enhancing the seal by using a thermoplastic bonding layer that is annular in form, allowing for thermal welding and minimizing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ostomy bag is bonded directly to the foam intermediate layer, then the device complexity is reduced, but the reliability of the seal deteriorates due to stress risers causing tearing and peeling
Solution Approach 1:
A bonding layer made of flexible material is introduced between the ostomy bag and the foam intermediate layer. This bonding layer acts as a stress-dispersing intermediary that prevents stress concentration at the bonding interface, thereby eliminating tearing and peeling while maintaining overall structural simplicity.
2Strength
If a rigid plastic substrate is incorporated into the mounting plate, then the strength of the bonding interface is improved, but the comfort and flexibility deteriorate
Solution Approach 1:
The bonding layer is constructed from flexible material that can conform to the contours of the user's body and movement, maintaining comfort and flexibility. At the same time, this flexible layer provides sufficient bonding strength to secure the ostomy bag, eliminating the need for rigid plastic substrates.
3Strength
If the bonding region extends to the peripheral edge of the bonding layer, then the bonding strength is maximized, but the stress concentration at the edge causes tearing and peeling
Solution Approach 1:
The bonding layer is designed with non-uniform bonding regions: a first bonding region extends to the peripheral edge for maximum bonding strength, while a second bonding region is positioned inward to avoid stress concentration. This local differentiation allows the structure to have both strong bonding and stress dispersion capabilities.
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
This configuration significantly reduces the risk of tearing and peeling, maintaining the seal integrity and preventing leakage, even under tensile or shear forces, thereby ensuring the ostomy pouch's functionality and user comfort.
Implementation Method 1
allowing for thermal welding
Data Source
AI summary
An ostomy pouch assembly (1) comprises a receptacle (2) for receiving material from a stoma of a person, and a mounting plate (4) for securing the receptacle to a person's body. The mounting plate includes a first layer (10) with an outer surface that is configured to be bonded to a person's skin and an inner surface. An intermediate layer (12) is located between the inner surface of the first layer (10) and the receptacle (2). A stress displacement or bonding layer (16) is located between the intermediate layer (12) and the receptacle (2) for bonding the mounting plate (4) to the receptacle (2). The region of bonding securement between the bonding layer (16) and the intermediate layer (12) has a first peripheral edge (20), and the region of bonding securement between the bonding layer and the receptacle has a second peripheral edge (26) that is located inwardly of the first peripheral edge (20).