Non-Contact Fluid Drive for Contamination-Free Microfluidic Testing
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Solution Overview
Problem
Existing drive devices for microchannel chips used in medical inspection analyzers often contaminate detection fluids due to contact with pumps, valves, and pipes, leading to inaccurate results and maintenance issues.
Innovation Solution
A non-contact fluid-drive device with a base, fluid container, pressing mechanism, and rotation mechanism that uses cams and rotation shafts to guide detection fluid from the container to an inspection groove without contacting other components, reducing contamination and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact-type pumps, valves and pipes are used to drive detection fluid, then the fluid can be transported to specified positions, but the detection fluid becomes contaminated and remains in the components causing false positives and false negatives
Solution Approach 1:
The patent extracts and eliminates the contact-type drive components (pumps, valves, pipes) from the system. Instead, it uses a non-contact drive mechanism where a drive wheel with circumferential grooves directly engages with the detection fluid through capillary action, allowing fluid transport without contamination from mechanical components
Solution Approach 2:
The patent introduces circumferential grooves on the drive wheel as an intermediary mechanism. These grooves capture and transport detection fluid through capillary action, serving as a mediator between the drive wheel and the fluid without requiring direct contact with traditional pump components, thereby preventing contamination
2Productivity
If contact-type drive devices are used, then fluid transport is achieved, but residue crystallizes and damages the pump motor
Solution Approach 1:
The patent removes traditional pumps and motors from the system, replacing them with a passive non-contact drive mechanism. The drive wheel rotates without requiring a motor, using the capillary action of the detection fluid itself to drive rotation, thereby eliminating the risk of crystallization damage to motor components
Solution Approach 2:
The detection fluid serves itself by providing the driving force through its own capillary action. The fluid's surface tension and adhesive properties enable the drive wheel to rotate without external motors, and the fluid is completely discharged through the inspection groove without residue remaining in the system
3Ease of operation
If traditional drive devices with multiple components are used, then fluid can be driven, but the device complexity increases and maintenance becomes necessary
Solution Approach 1:
The patent merges multiple traditional components (pump, valves, pipes, motor) into a single integrated drive wheel with circumferential grooves. This unified structure performs all fluid transport functions without requiring separate components, simplifying the device and eliminating maintenance needs
Solution Approach 2:
The drive wheel with circumferential grooves serves multiple functions simultaneously: it acts as the drive mechanism, the fluid transport channel, and the discharge mechanism. This multi-functional design eliminates the need for separate pumps, valves, and pipes, reducing device complexity while maintaining operational effectiveness
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
The device improves detection accuracy by preventing fluid contamination and reduces maintenance costs by eliminating the need for components like pumps and valves, while also potentially lowering power consumption.
Implementation Method 1
The pressing mechanism is configured to press the fluid container... When the storage portion is pressed by the pressing mechanism, the detection fluid of the storage chamber flows to the inspection groove via the fluid channel
Data Source
AI summary
A fluid-drive device includes a base, a fluid container, a pressing mechanism, and a rotation mechanism. The fluid container is disposed on the base. The pressing mechanism is disposed on the base, and configured to press the fluid container. The rotation mechanism is connected to the pressing mechanism. The pressing mechanism presses the fluid container by rotating the rotation mechanism. The fluid-drive device may guide the flow of the detection fluid in the fluid container in a non-contact manner to reduce the contamination of the fluid specimen and increase the reliability of the detection.