| 摘要 |
Pumping apparatus for dispensing or otherwise metering precise and minute volumes (measured in microliters) of fluid (e.g. human blood) from a flexible conduit containing such fluid. According to a preferred embodiment, such apparatus includes a pinch valve for selectively captivating a certain volume of fluid in the conduit between the pinch valve and the conduit's outlet end, and a pinch pump for selectively expelling a predetermined portion of the captivated fluid through the conduit's outlet end. The pinch pump is located and adapted to pinch closed a predetermined length of the conduit's fluid passageway. Preferably, such length is adjustable to adjust the volume of fluid dispensed or metered, and the pinch pump is structured to assure that, during activation of the pinch pump, the captivated fluid is advanced towards the outlet end of the conduit.
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