Adhesive Membrane Obturation for Microbial Test Card Isolation
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Solution Overview
Problem
Existing test cards for microbiological analysis face challenges in preventing cross-contamination between wells, particularly due to the close spacing of wells and the complexity of existing methods for ensuring obturation, which can compromise the integrity of the samples.
Innovation Solution
A method involving the use of an adhesive membrane on the test card, where a force is applied to displace the membrane to fit its shape to the channel walls, creating an isolation area to prevent fluid communication between wells, using a pressing member to ensure adhesion and displacement of adhesive in obturation areas, thereby isolating the wells without deforming the card.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between wells is decreased to increase the number of wells on the test card, then the productivity and information capacity of the test card is improved, but the risk of cross-contamination between wells increases
Solution Approach 1:
The patent divides the continuous adhesive membrane into distinct isolation zones that segment the fluidic pathways between adjacent wells. Each well is separated by its own isolation zone created by localized deformation of the membrane, preventing cross-contamination while maintaining high well density on the test card.
Solution Approach 2:
The adhesive membrane is selectively deformed only in specific locations corresponding to channel regions between wells, while remaining intact in other areas. This localized deformation creates obturation zones precisely where needed to prevent cross-contamination, without affecting the overall structure or other functional areas of the test card.
2Reliability
If heated punches are used to locally deform the test card for closing sample wells, then the isolation between wells is improved, but the risk of degrading the sample wells and compromising test integrity increases
Solution Approach 1:
The adhesive membrane serves as an intermediary layer between the punching tool and the test card substrate. The membrane absorbs the mechanical deformation energy and creates the isolation effect without directly transmitting harmful forces to the underlying sample wells, thus preventing degradation while achieving effective isolation.
Solution Approach 2:
The adhesive membrane is designed as a sacrificial, disposable component that is locally deformed and destroyed in the isolation zones to create the obturation effect. This allows aggressive local deformation to be applied to the membrane without risking damage to the permanent test card structure or samples, as the membrane is replaced with each test card.
3Reliability
If existing obturation methods are applied to prevent cross-contamination, then the isolation between wells is improved, but the complexity of the manufacturing method increases
Solution Approach 1:
The adhesive membrane serves multiple functions simultaneously: it provides the primary sealing function to prevent leakage, acts as the isolation mechanism through localized deformation, and creates the obturation zones for preventing cross-contamination. This multi-functionality eliminates the need for separate isolation components or complex multi-step manufacturing processes.
Solution Approach 2:
The manufacturing process utilizes controlled changes in mechanical parameters (local deformation force and displacement) applied to the adhesive membrane to create the isolation effect. By varying these parameters in specific zones during a single processing step, the method achieves effective isolation without requiring complex equipment or multiple manufacturing stages.
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 method effectively isolates sample wells, preventing cross-contamination while maintaining the integrity of the test card's structure, and is simpler to apply than existing techniques, ensuring reliable microbiological analysis results.
Implementation Method 1
a force is applied to displace the membrane to fit its shape to the channel walls, creating an isolation area to prevent fluid communication between wells, using a pressing member to ensure adhesion
Data Source
AI summary
The invention relates to a method for isolating at least one fluid sample well laid out in a test card for analyses, said test card including a plate (3) having at least one first main face from which is laid out at least one channel communicating with at least said well, this first face being coated with a membrane (17) provided with an adhesive (18) and which will cover said channel with a covering area (171), the method for isolation including a phase for introducing a fluid sample into at least said well and a phase for isolating said well consisting of exerting a force on at least one portion of the covering area (171) of the adhesive membrane (17) for ensuring displacement of the adhesive into an obturation area for the sample well.