Multi-layer Bag Integrity Detection via Color-Changing Pigment
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Solution Overview
Problem
Sterilization bags used for medical devices often lose integrity during transport or storage, leading to potential contamination of the devices, which can be hazardous to patients. Existing indicators cannot detect breaches in these bags due to their porous nature, necessitating costly and time-consuming decontamination of all devices in a batch.
Innovation Solution
A multi-layer bag design featuring a gas-impervious portion with an outer layer, an inner layer, and an intermediate layer. The intermediate layer contains a matrix and a pigment that changes optical properties in response to environmental changes, such as breaches, allowing for visual detection of integrity loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous portion is used to allow sterilizing gas to penetrate into the bag, then sterilization effectiveness is improved, but the ability to detect breaches using atmospheric change indicators is worsened
Solution Approach 1:
The bag is divided into functionally distinct zones: a porous portion for gas permeability and sterilization, and a gas-impervious portion with indicator layers for breach detection. This segmentation allows each zone to perform its specific function without interfering with the other, resolving the contradiction between sterilization effectiveness and breach detectability
Solution Approach 2:
The gas-impervious portion acts as an intermediary layer that introduces a detectable signal (color change) to indicate breaches. This intermediary component enables breach detection without compromising the porous portion's sterilization function, as the indicator layers respond to atmospheric changes only when integrity is compromised
2Object-affected harmful factors
If decontamination is carried out for all medical devices in a batch, then patient safety is improved, but cost and time consumption are worsened
Solution Approach 1:
The indicator layers provide visual feedback about the integrity status of each individual bag. This feedback mechanism allows users to identify only the bags that require decontamination, eliminating the need for batch-wide decontamination and thereby reducing cost and time while maintaining patient safety
Solution Approach 2:
The bag itself provides information about its own integrity status through the color-changing indicator layers. This self-diagnosis capability enables selective decontamination decisions without requiring external testing or assumption-based batch processing, optimizing resource allocation while ensuring safety
3Reliability
If a small breach is formed in the bag wall, then loss of integrity occurs, but visibility of the damage is worsened
Solution Approach 1:
The indicator layers contain pigments that change color in response to atmospheric changes caused by breaches. This color change mechanism amplifies the detection signal, making even small breaches visible through obvious color transitions, thereby resolving the contradiction between maintaining integrity and detecting damage
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 multi-layer bag effectively indicates loss of integrity through visible color changes, enabling targeted decontamination only for damaged bags, thus reducing unnecessary costs and ensuring patient safety.
Implementation Method 1
the intermediate layer comprises a matrix and a pigment distributed within the matrix, the pigment being configured to change at least one optical property in reaction to an environment change resulting from a damage of the outer and/or inner layer
Implementation Method 2
a porous portion configured to allow a sterilizing gas to penetrate into the bag
Data Source
AI summary
A multi-layer bag comprising a porous portion configured to allow a sterilizing gas to penetrate into the bag and a gas-impervious portion, characterized in that the gas-impervious portion comprises an outer layer, an inner layer and an intermediate layer integrally formed together so that the intermediate layer is sealingly enclosed between the outer layer and the inner layer so as to be physically isolated from inner and outer environment of the bag, and the intermediate layer comprises a matrix and at least one pigment distributed within the matrix, the pigment being configured to change at least one optical property in reaction to an environment change resulting from a damage of the outer and/or inner layer.