Hollow Fiber Membrane Integrity Testing via Pressure Gradient
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Solution Overview
Problem
Current methods for testing the integrity of filters with porous membranes, particularly in extracorporeal blood treatment and medical fluid preparation, are not reliable or efficient, often requiring extensive processes and time to determine membrane integrity.
Innovation Solution
A process and apparatus that establish a pressure gradient between compartments of a dry filter, introduce a predefined volume of testing liquid to wet the membrane, and monitor the pressure gradient or gas flow through the membrane to quickly and reliably assess filter integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional bubble point test is used to check membrane integrity, then measurement precision is improved, but testing time and productivity are worsened
Solution Approach 1:
The filter element is pre-wetted with liquid before the test to ensure pores are filled, and a preliminary pressure stabilization period is included before measurement begins. This preliminary preparation ensures accurate measurement while the automated sequence maintains efficiency.
Solution Approach 2:
The system automatically detects when bubble point is reached by monitoring pressure changes, eliminating the need for manual observation. The automated detection and evaluation of test results eliminates operator intervention and speeds up the testing process while maintaining precision.
2Measurement precision
If manual bubble point testing is performed, then measurement precision is improved, but loss of time is worsened
Solution Approach 1:
The system automatically detects when bubble point is reached by monitoring pressure changes, eliminating the need for manual observation. The automated detection and evaluation of test results eliminates operator intervention and speeds up the testing process while maintaining precision.
Solution Approach 2:
The test sequence is automated and continuous, with the pressure transducer continuously monitoring pressure changes throughout the entire testing process. This eliminates idle time between operations and maintains continuous productive action from wetting through measurement to result evaluation.
3Reliability
If extensive testing procedures are used to ensure reliability, then reliability is improved, but device complexity is worsened
Solution Approach 1:
The invention extracts only the essential elements needed for reliable testing: a pressure transducer to detect bubble point, a liquid source for wetting, and an automated detection system. This minimal but sufficient set of components achieves high reliability without unnecessary complexity.
Solution Approach 2:
The system uses feedback from the pressure transducer to automatically detect when bubble point is reached and evaluates test results against predetermined criteria. This automated feedback loop ensures reliable verification while simplifying the overall system operation and reducing complexity.
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 allows for fast and accurate identification of defective filters, increasing production throughput and providing a more efficient quality management process for filter production.
Implementation Method 1
introducing a volume of testing liquid which is sufficient to substantially reduce gas permeability of the porous membrane
Implementation Method 2
allowing the testing liquid to wet the porous membrane
Implementation Method 3
establishing a pressure gradient between the compartments of the filter
Implementation Method 4
measuring gas flow through the membrane
Implementation Method 5
a porous membrane separating a gas-filled first compartment from a liquid-filled second compartment
Data Source
AI summary
A process and a device for testing a hollow fiber membrane filter comprises two compartments separated by a porous membrane. A specific amount of testing liquid is provided via a line from a testing liquid reservoir.