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Updated: Apr 26, 2026

Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices

Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices

Published on: January 27, 2017

Finger-powered microfluidic systems using multilayer soft lithography and injection molding processes.

Kosuke Iwai¹, Kuan Cheng Shih, Xiao Lin

¹Department of Mechanical Engineering, University of California, Berkeley, USA. iwai@me.berkeley.edu.

|August 8, 2014

Summary

This summary is machine-generated.

This study introduces a novel finger-powered microfluidic pump, eliminating the need for external power sources in point-of-care devices. This innovation enables portable, low-power microfluidic applications and controlled microdroplet generation.

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Area of Science:

Biomedical Engineering
Microfluidics
Lab-on-a-chip technology

Background:

Point-of-care (POC) and disposable biomedical applications require low-power microfluidic systems with controlled pressure sources.
External pumps limit the portability and power efficiency of current microfluidic systems.

Purpose of the Study:

To propose and demonstrate a finger-powered integrated pumping system for advanced microfluidic applications.
To obviate the need for electrical power sources in microfluidic pressure generation.
To enable finger-powered on-chip microdroplet generation.

Main Methods:

Development of a finger-powered integrated pumping system.
Design and implementation of passive fluidic diodes for multi-fluid handling.
Fabrication using multilayer soft lithography and injection molding.
Characterization of pressure head generation and microdroplet formation.

Main Results:

A maximum pressure head of 7.6 ± 0.1 kPa was achieved using human finger actuation.
The system successfully pumped distinct fluids from multiple inlets using a single actuation source.
Rapid formation of water-in-oil and oil-in-water droplets, as well as cell encapsulation, was demonstrated.

Conclusions:

The finger-powered pumping system offers a portable, low-power solution for microfluidic applications.
This technology eliminates the need for external electrical controllers in microfluidic devices.
The system is suitable for advanced applications like on-chip microdroplet generation and cell encapsulation.