Centrifugal Microfluidic Cartridge Sample Application
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Solution Overview
Problem
Current point-of-care diagnostic systems using centrifugal microfluidic technologies face challenges in sample application, including user error, biohazard and aerosol contamination risks, complex user workflows, increased manufacturing costs, and cartridge cleaning requirements, particularly with external transfer pipettes and integrated inlet capillary ports.
Innovation Solution
A sample application method utilizing a transfer pipette with a fluidic barrier and air vent, where the sample is applied through capillary action and dispensed into a centrifugal microfluidic cartridge using centrifugal force generated by rotation, minimizing leakage and contamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an external transfer pipette is used for sample application, then sample transfer capability is provided, but biohazard and aerosol contamination risk increases
Solution Approach 1:
The disturbing element (transfer pipette) is extracted from the system and replaced with an integrated capillary port that performs the same function without the associated contamination risks. The capillary port is built directly into the cartridge, eliminating the need for external pipettes that can generate aerosols and biohazard contamination during sample transfer.
Solution Approach 2:
The sample application function is merged with the cartridge structure itself through the integrated inlet capillary port. Instead of using a separate external pipette, the capillary port is incorporated directly into the cartridge body, allowing sample application and processing to occur within a single integrated device, thereby eliminating contamination risks associated with external transfer tools.
2Ease of operation
If an integrated inlet capillary port is used, then sample application is simplified, but manufacturing complexity and cost increase
Solution Approach 1:
The capillary port is implemented as a localized feature within the cartridge structure rather than a complex integrated system. By concentrating the capillary action functionality in a specific local area (the inlet port region), the design achieves simplified sample application while maintaining relatively simple manufacturing processes for the overall cartridge.
3Ease of operation
If an integrated inlet capillary port protrudes from the cartridge, then user operation is facilitated, but manufacturing precision requirements increase
Solution Approach 1:
The capillary port is pre-formed as an integral part of the cartridge manufacturing process rather than requiring post-manufacturing assembly or adjustment. By incorporating the capillary port formation into the initial cartridge fabrication (through molding or drilling), the positioning precision is established during manufacturing without requiring complex alignment procedures, and the protruding structure is already optimized for user access.
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 reduces user error, biohazard and aerosol contamination risks, simplifies user workflow, lowers manufacturing costs, and integrates fail-safe mechanisms, providing a cost-effective and efficient sample application process for point-of-care diagnostics.
Implementation Method 1
a biological sample is applied to the transfer pipette through capillary action upon contact by the pipette's tip with the sample
Implementation Method 2
The force applied to dispense the biological sample from the transfer pipette is a centrifugal force caused by rotation of the cartridge
Data Source
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AI summary
The invention relates to a microfluidic system for processing biological samples comprising a transfer pipette; a platform adapted to provide at least one receiving chamber and configured to receive said transfer pipette, and a distal output chamber wherein a biological sample from the transfer pipette is dispensed into the output chamber when a centrifugal force is applied.