G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 1/18 (2006.01) G01N 1/34 (2006.01) G01N 33/49 (2006.01)
Patent
CA 2219722
A filter is pressed down in a collection tube holding separated blood as a lower solids mass and an upper liquid mass defining an interface with the lower mass. The filter has a sleeve fittable in the tube with a lower end of the sleeve covered by a membrane that fits snugly in the tube. A vertical level of an upper surface of the upper liquid mass in the tube is detected and a pusher is engaged with an upper end of the sleeve to push the filter downward in the tube. A vertical level of the interface is also detected. Downward pushing of the filter is stopped when either the upper end of the sleeve is at a predetermined spacing above the vertical level of the liquid upper surface or the membrane is at the vertical level of the interface. Thus two separate events can trigger stopping of the downward pushing: reaching the interface or reaching a certain fill level in the sleeve. Contamination of the upper liquid mass by over-insertion of the filter is prevented as well as contamination of the pusher and, possibly, the sample and the workplace by insertion of the filter past the point where the upper end of the sleeve reaches the level of the upper surface of the liquid mass.
Borden Ladner Gervais Llp
Sarstedt Ag & Co.
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