Pipette means

Details Pipette means Pipette means

B - Operations, Transporting

01

L

222/2

B01L 3/02 (2006.01)

Patent

CA 1160999

ABSTRACT OF THE DISCLOSURE IMPROVEMENTS IN OR RELATING TO PIPETTE MEANS This invention is in the field of automatic chemical (more especially bio-chemical) analysis. Pipette means are provided in which a circumferentially compressible tube communicates through the lower of two connecting tubes with a pipette tip, and through the upper with a source of diluent. The tube is compressed circumferentially and elastically by fluid pressure applied through a connector into a space surrounding the tube inside a block. Relief of the pressure allows the tube to expand and draw a sample into said pipette tip, the sample volume being dependent on the fluid pressure applied. Re-application of pressure expels the sample from the pipette tip. Any diluent required is supplied through the upper connecting tube, and passes out through the pipette tip. It is important for consistency of results that the tube be compressed elastically, and a suitable material for the tube is latex rubber. It may be lined with silicone rubber to reduce moisture absorption. The above-described pipette means improves accuracy of sampling, and diluting and dispensing of liquids, eg blood serum.

363643

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