G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 1/36 (2006.01) A61B 5/08 (2006.01) A61B 5/087 (2006.01) G01F 1/44 (2006.01) G01F 1/68 (2006.01) G01F 5/00 (2006.01)
Patent
CA 2086962
A SIDESTREAM FLOW SENSOR FOR SPIROMETRY ABSTRACT OF THE DISCLOSURE An improved spirometer for measuring the flow rate of breaths includes a mainstream conduit having a fixed or variable restrictor formed therein for producing a pressure differential across the restrictor, and one or more sidestream conduits having a first end in fluid communication with the mainstream conduit, upstream of the restrictor, and a second end in fluid communication with the restrictor. A thermal flow sensor is disposed within each sidestream conduit, and includes a heater element and a pair of temperature sensors located upstream and downstream of the heater element connected in a bridge configuration to generate an analog signal for output to a data processing system to measure the flow rate of breath in the tube.
Neville Dee J.
Puritan-Bennett Corporation
Smart & Biggar
LandOfFree
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