A sensor for analyzing a fluid sample has a sample cavity for accepting sample fluid. At least one test region is disposed along the sample cavity, and at least one vent fulfills the dual function of venting the sample cavity and guiding the sample fluid in the sample cavity via appropriate location...http://www.google.ca/patents/US7543481?utm_source=gb-gplus-sharePatent US7543481 - Fluid testing sensor having vents for directing fluid flow
