Bioreactor Integrity Testing with Flexible Membrane
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Solution Overview
Problem
Current methods for integrity testing of bioreactor vessels are prone to damaging the vessels during handling, which can lead to false leak detection, and do not allow for reliable 'in situ' testing without removing the vessels from their operational devices.
Innovation Solution
A method and device utilizing a fluid-tight, partially flexible bioreactor container with a fluid-permeable or structured receiving layer in the test device, allowing for pressure-based integrity checks without direct contact between the bioreactor vessel and the receptacle, using a pressure difference or fluid quantity to maintain overpressure, and detecting fluid substances to assess tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bioreactor vessel is placed in a test fixture for integrity verification, then the integrity test can be performed, but the vessel may be damaged during handling creating false leaks
Solution Approach 1:
The vessel is pressurized with test fluid before being placed in the test fixture, so the integrity test can be performed immediately upon insertion without requiring subsequent handling or repositioning that could cause damage
Solution Approach 2:
A flexible membrane with opening(s) is introduced as an intermediary between the test fixture and the bioreactor vessel. The membrane allows test fluid to pass through to the vessel interior while preventing direct contact and potential damage between the rigid fixture and the flexible vessel during the testing process
2Reliability
If the bioreactor vessel is removed from its operational device for testing, then the integrity test can be performed, but 'in situ' testing capability is lost
Solution Approach 1:
The test fixture is designed with universal compatibility to accommodate various bioreactor vessel types and sizes. The flexible membrane and adjustable positioning mechanisms allow the same fixture to perform integrity tests on different vessel configurations without requiring vessel removal from operational devices
Solution Approach 2:
The vessel is pressurized with test fluid before being placed in the test fixture, enabling the integrity test to be performed immediately in its operational position without removal, thereby maintaining in situ testing capability while ensuring test accuracy
3Device complexity
If a rigid test fixture is used for integrity testing, then the testing structure is simple, but the flexible vessel wall may contact the receptacle wall sealing potential leaks
Solution Approach 1:
A flexible membrane with opening(s) is positioned between the rigid test fixture and the bioreactor vessel. This flexible membrane allows the vessel wall to contact it without direct contact with the rigid receptacle wall, preventing false sealing of potential leaks while maintaining structural simplicity
Solution Approach 2:
The flexible membrane incorporates openings that allow test fluid to pass through to the vessel interior. This porous/open structure enables pressure equalization and leak detection while preventing the membrane itself from sealing against the vessel wall in a way that would mask actual leaks
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 approach enhances the accuracy of integrity testing by preventing unintentional sealing of leaks and enabling 'in situ' checks, ensuring the bioreactor vessel's integrity is reliably assessed before and after use without compromising the testing process.
Implementation Method 1
Filling the bioreactor vessel with a fluid from the fluid source in order to generate a predetermined overpressure P1 in the bioreactor vessel at a first time T1
Implementation Method 2
a fluid-permeable or structured receiving layer (7), which is arranged as part of a wall of the bioreactor vessel holder (25)
Data Source
Figure 1
Figure 2a~4b
Figure 5
AI summary
One aspect concerns a method for testing the integrity of a bioreactor vessel comprising the following steps: - Providing a bioreactor vessel with a fluid-tight, at least partially flexible wall and with at least one vessel opening; - Providing a test device with a bioreactor vessel holder and a fluid-permeable and/or structured receiving layer, which is part of the wall of the bioreactor vessel holder; - Arranging the bioreactor vessel in the bioreactor vessel holder, wherein the wall of the bioreactor vessel contacts the receiving layer in the bioreactor vessel holder at least partially; - Connecting the at least one opening of the bioreactor vessel to a fluid source; - Filling the bioreactor vessel with a fluid from the fluid source to generate a predetermined overpressure P1 in the bioreactor vessel at a first time T1;- Discriminating whether the bioreactor container is sufficiently sealed and having a corresponding device.;