Microfluidic Apparatus with Sensor-Actuator Particle Dispensing
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Solution Overview
Problem
Current microfluidic systems lack efficient methods for controlled and precise dispensing of particles, such as cells, into specific locations, which is crucial for diagnostics and research applications.
Innovation Solution
A microfluidic apparatus with a sensor and actuator system that detects particles passing through a channel and controls fluid dispensing through a nozzle, allowing for closed-loop delivery of specific quantities of particles to designated wells based on type and number, using impedance or light detection and actuator activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional microfluidic systems are used for particle dispensing, then the system structure is simple, but the dispensing precision and control capability are insufficient
Solution Approach 1:
The microfluidic device is divided into distinct functional modules: a channel for particle transport, a foyer for particle accumulation, and a nozzle for dispensing. This segmentation allows each module to be optimized for its specific function, improving overall dispensing precision while maintaining manageable system complexity through modular design.
Solution Approach 2:
A sensor is integrated into the system to detect particle passage through the channel and trigger actuator activation. This closed-loop feedback mechanism enables precise control of particle dispensing timing and quantity, significantly improving dispensing precision by ensuring particles are released only when detected and positioned correctly.
2Extent of automation
If no sensor-actuator system is used, then the device complexity is low, but the control capability and automation level are insufficient
Solution Approach 1:
The sensor detects particle passage and provides feedback to the controller, which automatically triggers the actuator to dispense particles. This automated feedback loop eliminates manual intervention, achieving high automation levels while keeping device complexity manageable through integrated control logic.
Solution Approach 2:
The system uses the particle itself as the trigger signal - when a particle passes through the sensor zone, it automatically initiates the dispensing sequence without external intervention. This self-service mechanism enhances automation by making the system responsive to its own operational state.
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
Enables precise and configurable dispensing of cells or other particles into specific locations, enhancing diagnostic capabilities and providing a mobile platform for health diagnostics.
Implementation Method 1
A sensor is positioned to detect the passage of a particle of interest, e.g., a cell, through the channel
Implementation Method 2
using impedance or light detection and actuator activation
Data Source
Figure 1A
Figure 1B~2
Figure 3~4
AI summary
According to an example, a microfluidic apparatus may include a fluid slot, a foyer in fluid communication with the fluid slot via a channel having a relatively smaller width than the foyer, a sensor to detect a presence of a particle of interest in a fluid passing through the channel, a nozzle in fluid communication with the foyer, and an actuator positioned in line with the nozzle. The microfluidic apparatus may also include a controller to receive information from the sensor, determine, from the received information, whether a particle of interest has passed through the channel, and control the actuator to expel fluid in the foyer through the nozzle based upon the determination.