| 摘要 |
<p>It is well known to dispense quantities of liquid on to test elements using pipettes. However, due to peculiar properties of many body liquids, great care is needed to ensure that accurate and reproducible amounts of such liquids are dispensed. Disclosed herein is dispensing apparatus which can be used in combination with standard pipettes to allow accurate predetermined amounts of liquid to be dispensed. The dispensing apparatus includes a liquid transfer unit (20) which comprises a frame (22) having a liquid inlet aperture (30) connected by a first passageway (34, 35) to a dispensing aperture (28), an air vent aperture (42) connected by a second passageway (44) which extends toward the first passageway (34, 35), and a valve (50, 52, 54, 56) interposed between the two passageways (34, 35, 44). The liquid aperture (30) is shaped to receive a number of conventional pipettes. The valve (50, 52, 54, 56) allows continuous liquid flow along the first passageway (34, 35) when in a first position, or continuous air flow along the second passageway (44) and into part of the first passageway (35) when in a second position to effect dispensing of the liquid. <IMAGE></p> |
