An impedance pump is a valveless pump consisting of an elastic tube connected on both ends to an inelastic tube. Tapping the end of a tube will cause flow of liquid inside the system.
Very small versions of an impedance pump -- a micro impedance pump -- can be used as a micropump for lab-on-a-chip active microfluidics.[1]
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Rinderknecht, Derek Gresham (2008).
"Development of a microimpedance pump for pulsatile flow transport : Part 1: Flow characteristics of the microimpedance pump. Part 2: A systematic study of steady and pulsatile transport in microscale cavities.".
Dissertation (Ph.D.), California Institute of Technology.
[1];
[2].
says:
"The micro impedance pump is valveless, bidirectional, and can be constructed simply from a wide range of materials.".
"The Impedance Pump".
p. 29 says
"... impedance pumps in a planar format which can easily be prototyped with other microfluidic components within the context of Lab on Chip diagnostics."