G - Physics – 08 – B
Patent
G - Physics
08
B
340/140.1, 340/1
G08B 21/00 (2006.01) A61M 5/36 (2006.01)
Patent
CA 1157291
ABSTRACT OF THE DISCLOSURE Air bubbles in a transparent intravenous solution conduit are detected, regardless of whether the solution is opaque or clear, by directing a light source at the conduit and detecting light shining through the solution with a first light sensor while detecting light reflected from the interior wall of the conduit with a second light sensor. If liquid is present in the conduit, whether clear or opaque, one sensor will see a low light level while the other sees a high level. If air is present, both sensors see a high light level. By EXCLUSIVE-OR'ing the outputs of the two sensors, a logic signal is obtained which is high only when the presence of liquid in the conduit is being detected. Means using two sensor assemblies spaced axially along the conduit, and a counter associated with each, are also provided to allow passage of minor air bubbles, and to provide a backup signal representative of a predetermined volume of air passing either assembly independently of the other.
379943
Cutter Laboratories Inc.
Swabey Mitchell
LandOfFree
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