Pump for low flow rates
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United States of America Patent
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Mar 29, 2005
Issued Date -
N/A
app pub date -
Aug 5, 2004
filing date -
Jun 21, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention concerns a method of producing flow rates of a transport liquid of about 1 to 1000 nl/min. The method provides a pump having a housing defining a space and including a channel and a wettable membrane positioned in the housing, the membrane including a first side facing toward the channel and a second side facing the space. The method further includes at least partially filling the channel with the transport liquid, contacting the wettable membrane with the transport liquid to generate an underpressure in the channel,evaporating the transport liquid at the wettable membrane to remove the transport liquid from the channel and to create an underpressure in the channel, and maintaining a generally constant vapor pressure of the transport liquid in the space.
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