Patent ID: 8043865
Filing Date: 2011-10-25
Classification: B01F,B01L,G01N,Y10T

Abstract:
1. A method of mixing a sample liquid with a diluent liquid, the method comprising: providing a device tip including: an elongated body having an outer surface and an interior wall, a portion of the interior wall defining an internal cavity open at a lower end of the body; the body defining an opening in an upper portion of the body, through which air can be drawn from the cavity to draw liquids into the cavity through the lower end of the body; wherein the portion of the interior wall defining the internal cavity also defines a pocket open to the internal cavity, the pocket radially extending into the portion of interior wall defining the internal cavity, the pocket sized and configured to collect a dose of a liquid drawn into the cavity and to retain the dose of the liquid as the cavity is otherwise evacuated; drawing a sample liquid into the device tip; collecting a dose of the sample liquid in the pocket of the device tip; retaining the dose of the sample liquid in the pocket of the device tip while expelling the sample liquid from the internal cavity of the device tip; and then drawing a volume of a diluent liquid into the device tip a sufficient distance to contact the retained dose of sample liquid to induce mixing of the diluent liquid with the dose of sample liquid.