B - Operations – Transporting – 01 – L
Patent
B - Operations, Transporting
01
L
182/128, 23/433
B01L 99/00 (2010.01) B01L 3/02 (2006.01)
Patent
CA 1217919
TITLE OF THE INVENTION IMPROVEMENTS IN APPARATUS AND METHOD FOR OBTAINING REPRODUCIBLE LIQUID SAMPLES OF SMALL VOLUME ABSTRACT OF THE INVENTION An improved apparatus and semi-automatic method for the preparation of a sample of liquids, e.g., solutions, suspensions, and other liquid-phase media is described. The apparatus includes an elongated container, e.g., a test tube, an elongated tube of smaller diameter than the test tube with its lower end closed, herein referred to as the sample petter, and an aspirating or vacuum device. The sample petter has an enlarged hollow chamber near its closed lower end. In a first preferred embodiment, the sample petter tube is insertable in a test tube so that, when the closed lowermost end of the petter tube rests on the test tube bottom, the outer periphery of the enlarged hollow chamber does not sealingly engage the internal walls of the test tube but is only fairly closely spaced thereto, e.g. by 0.003" - 0.006". The hollow chamber has a fluid opening formed therein in fluid communication with the open upper end of the test tube, and excess sample in the test tube is readily aspirated from above the fluid opening when an aspirator device is connected to the open upper end of the petter tube to leave, intact, a desired predetermined, reproducible volume of sample liquid below the fluid opening. The sample petter tube is then readily withdrawn from the test tube because there is no sealing engagement of the petter walls with the internal walls of the test tube. Other embodiments of petter tubes are shown and described. After the petter tube is withdrawn from the test tube, it is released from the aspirator device (in any of the embodiments) by a remote push-button semi-automatic means provided in the aspirator device. In either case, no physical contact between the technician and the petter tube is required.
437083
Macrae & Co.
V-Tech Inc.
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