Microfluidic Cytology Specimen Preparation via Inflatable Bladder Transfer
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Solution Overview
Problem
Traditional methods for preparing cytological specimens, such as Pap smears, face challenges in accurately evaluating samples due to debris, blood, and mucus, which can obscure cellular abnormalities, especially when cells are smeared directly onto slides without proper fluid handling and filtering.
Innovation Solution
A microfluidic apparatus and method that utilize a 'wet' environment to process specimens by delivering a fluid sample through microfluidic channels to a filter membrane, concentrating cells, and then transferring them to a slide using an inflatable bladder, while removing excess fluid and applying stains for enhanced visualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cells are smeared directly onto a slide without filtering, then the collection process is simple and quick, but debris, blood, and mucus obscure cellular abnormalities and reduce diagnostic accuracy
Solution Approach 1:
The patent employs a filter with porous structure to separate cells from debris, blood, and mucus. The filter allows cells to pass through while blocking larger debris particles, enabling precise cellular examination without obscuring artifacts. This resolves the contradiction by introducing a filtering mechanism that improves diagnostic accuracy while maintaining operational simplicity.
Solution Approach 2:
The patent introduces a filter as an intermediary component between the cell collection source and the slide. This intermediary device concentrates cells while removing harmful substances, enabling clear visualization of cellular abnormalities. The filter acts as a mediator that improves measurement precision without significantly increasing device complexity.
2Measurement precision
If a filter is used to concentrate cells, then debris is reduced and diagnostic accuracy improves, but the transfer process becomes more complex and time-consuming
Solution Approach 1:
The patent employs pneumatic pressure differentials to drive fluid flow through the filter and onto the slide. By controlling air pressure, the system rapidly transfers concentrated cells from the filter to the slide without manual manipulation. This hydraulic/pneumatic approach reduces transfer time while maintaining the benefits of filtering, resolving the contradiction between improved diagnostic accuracy and preparation time.
Solution Approach 2:
The patent utilizes phase transition of fluid through the filter medium to separate and concentrate cells. The filter allows fluid to pass while trapping cells, creating a concentrated cell layer ready for rapid transfer to the slide. This phase-based separation enables both effective concentration and quick transfer, addressing the time loss issue.
3Ease of operation
If cells are transferred in a semi-dry environment, then the transfer process is straightforward, but the wet environment needed for proper staining and cell integrity is compromised
Solution Approach 1:
The patent employs pneumatic pressure control to maintain a wet environment during cell transfer. By regulating air pressure differentials, the system keeps the filter and slide surfaces moist, enabling proper cell integrity and staining quality. This hydraulic approach maintains reliability while keeping the operation straightforward through automated pressure control.
Solution Approach 2:
The patent changes the environmental parameter from semi-dry to wet by controlling fluid flow through the filter and onto the slide. By adjusting flow rate and pressure parameters, the system maintains optimal moisture levels for cell integrity and staining. This parameter control enables both ease of operation and high reliability in cell transfer.
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 a more accurate and efficient preparation of cytological specimens by concentrating cells in a monolayer on the slide, reducing debris, and enabling precise staining, thereby improving diagnostic accuracy.
Implementation Method 1
an inflatable bladder configured to transfer the specimen from the filter to a slide
Implementation Method 2
a filter disposed on an inflatable bladder configured to transfer the specimen from the filter to a slide
Implementation Method 3
a first set of one or more microfluidic channels configured to deliver the sample fluid to a filter
Implementation Method 4
a pressure source, with a sample container connected (or connectable) to the pressure source and the first set of one or more microfluidic channels
Data Source
AI summary
An apparatus for processing a specimen from a fluid sample includes a first set of one or more microfluidic channels configured to deliver the sample fluid to a filter disposed on an inflatable bladder configured to transfer the specimen from the filter to a slide. The apparatus is configured to collect an approximate monolayer of particles and includes a second set of one or more microfluidic channels configured to remove fluid flowing through the filter disposed on the inflatable bladder. The apparatus also includes a pressure source, a sample container connected to the pressure source and the first set of one or more microfluidic channels, a fluid flow gauge configured to measure a fluid flow rate through the filter, and a stain source connected to the first set of one or more microfluidic channels.