Patent ID: 7622729
Filing Date: 2009-11-24
Classification: G01N

Abstract:
1. A diagnostic test device comprising means for sampling a liquid biological sample, means for reacting the sample with at least one reagent to provide one or more visible indicia and a photodetector arrangement for scanning a detection region to produce a pulsed output indicative of the presence of said one or more indicia, wherein the photodetector arrangement is connected to a signal processing circuit functional to produce a change in output in response to a change in detected light intensity which change in output is substantially independent of baseline photocurrent before the change, and wherein said photodetector arrangement comprises a photodetector and a light source, said device further comprising means to move at least part of said photodetector arrangement over a detection region which comprises the one or more indicia, and wherein said means to move at least part of the photodetector arrangement comprises triggered release means responsive to the presence of said liquid sample, and wherein the triggered release means comprises a releasable tether which upon release, allows relative movement to occur between said at least part of said photodetector arrangement and the detection region.