Impedance pump

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]

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. ; . 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."

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[1] 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. ; . 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."