Biopharmaceutical Pouch Integrity Testing via Pressure Drop
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Solution Overview
Problem
Current methods for checking the integrity of biopharmaceutical fluid bags are complex, time-consuming, and cannot test filled bags without risking contamination or requiring lengthy bacteriological challenge tests.
Innovation Solution
A method using external pressure to detect pressure drops and combining it with electrical current measurement through porous layers to determine bag integrity without internal gas or liquid invasion, allowing for quick and reliable testing of filled bags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sterile gas is injected into the bag to test integrity, then leak detection is enabled, but contamination risk increases and test complexity increases
Solution Approach 1:
The patent uses the biopharmaceutical fluid already present in the bag as an intermediary medium to transmit and equalize pressure during the integrity test, eliminating the need to introduce external sterile gas. The fluid itself serves as the pressure transmission medium, thereby avoiding contamination risks while maintaining test reliability through pressure differential measurement across the weld lines.
2Reliability
If sterile gas injection method is used, then integrity can be tested, but test time increases and sterilizing air filter testing is required
Solution Approach 1:
The patent extracts and eliminates the time-consuming steps of sterile gas injection, sterilizing air filter testing, and complex setup procedures from the integrity test process. By using the biopharmaceutical fluid already present in the bag as the pressure medium, the method reduces the test to essential operations: applying pressure differential and measuring it, thereby significantly reducing test duration while maintaining integrity detection capability.
3Reliability
If bacteriological challenge method is used, then integrity can be tested on filled bags, but test duration extends to 14 days and product storage is required
Solution Approach 1:
The patent replaces the biological/bacteriological testing system with a mechanical pressure differential measurement system. Instead of using bacterial challenges that require 14 days for growth observation, the method applies mechanical pressure to the biopharmaceutical fluid and measures pressure changes across weld lines, providing immediate integrity results without lengthy incubation periods or product storage requirements.
4Reliability
If external pressure is applied to the bag, then leak detection is enabled, but bag deformation may occur
Solution Approach 1:
The patent applies pressure locally and differentially across specific regions of the bag, particularly focusing pressure application on areas with weld lines where leaks are most likely to occur. By using the biopharmaceutical fluid already inside the bag as the pressure medium and applying pressure through the port, the method achieves effective leak detection at critical locations while minimizing overall bag deformation compared to uniform external pressure application.
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
Enables simple, rapid, and reliable integrity testing of biopharmaceutical fluid bags without contamination risks, capable of detecting leaks and defects efficiently.
Implementation Method 1
measuring the pressure inside the bag... A decrease in pressure indicates that there is a leak in the bag
Implementation Method 2
the intermediate layer being electrically non-conductive when it is dry... measuring an electrical value representative of an electrical current passing through the intermediate layer
Data Source
Figure 1A~1C
Figure 2~3
Figure 4~5
AI summary
A method for checking the integrity of a pouch (3) containing a biopharmaceutical fluid, using a device (7) comprising at least one pressure sensor (6; 16), a control unit (5) and two plates (1, 2) having porous front surfaces (SF1, SF2) between which the pouch (3) to be checked is placed, the method comprising: s1- applying a predetermined test pressure (Ptest) by bringing the two plates towards one another, thus sandwiching the pouch to be checked, s2- then maintaining the position of the plates for the remainder of the test, s3- measuring a pressure value representative of the pressure prevailing in the pouch (3) using the pressure sensor (6; 16), and determining the characteristics of a pressure drop over time, s4- deducing from this, by way of the control unit, a faulty state of the pouch if the pressure drop exceeds a predefined criterion.