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Microfluidics in Assessing Platelet Function
Published on: November 8, 2024
Computational and functional evaluation of a microfluidic blood flow device.
Richard J Gilbert1, Hyesung Park, Marco Rasponi
1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02135, USA.
ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|August 2, 2007
Summary
This study presents a novel microfluidic device for emulating pulmonary microcirculation. The design ensures hemocompatibility and uniform flow, paving the way for advanced biomedical technologies like miniature oxygenators.
Area of Science:
- Biomedical Engineering
- Microfluidics
- Physiology
Background:
- Developing microfluidic devices for physiological blood flow is crucial for emulating human organ function.
- Challenges include achieving maximum chemical diffusion and hemocompatibility in artificial microchannels.
- Existing technologies are limited by the constraints of artificial microchannel design.
Purpose of the Study:
- To design and evaluate an elastomeric microfluidic flow device that emulates the pulmonary microcirculation.
- To assess the device's flow properties, pressure drop, and hemocompatibility under physiological conditions.
- To investigate the potential of this device for advanced biomedical applications.
Main Methods:
- Designed an elastomeric microfluidic device using poly (dimethylsiloxane) with high aspect ratio, orthogonally interconnected channels.
- Utilized finite element simulations to analyze blood flow dynamics and pressure drop.
- Assayed hemolysis rate and checked for thrombus formation during prolonged perfusion experiments.
Main Results:
- Simulations showed a linear relationship between pressure drop and flow rate, with laminar flow and minimal hemolysis at rates <250 μL/min.
- Experimental results indicated a hemolysis rate <5.0% over 6 and 12-hour perfusions at 250 μL/min.
- No microscopic thrombus formation was observed under the tested perfusion conditions.
Conclusions:
- The developed microfluidic device with asymmetric, interconnected microchannels demonstrates uniform flow properties and preliminary hemocompatibility.
- This technology holds promise for the development of miniature oxygenators and other biomedical devices.
- The device's ability to support physiological blood flow in a microscale reaction volume is a significant advancement.
