Flow measuring apparatus

Details Flow measuring apparatus Flow measuring apparatus

1993-03-01

1995-08-22

Cohen, Lee S.

Surgery

Truss

Pad

7386142, A61B 5087

Patent

active

054430755

ABSTRACT:
Apparatus for accurately and reliably measuring fluid flow under turbulent or pulsating conditions with high signal-to-noise ratio and using a symmetrical design which works with flow in either direction. The apparatus is particularly well-suited for measuring airflow in a bi-level respiratory system. The apparatus includes a flow conduit, an upstream sense tube protruding into the flow conduit with a notch opening facing into the flow stream, a downstream sense tube protruding into the flow conduit with a notch opening facing away from the flow stream, and a flow or pressure sensor/transducer disposed in connecting lines between the upstream and downstream sense tubes. The notched opening has a semi-cylindrical shape. The flow conduit is either straight or angled.

REFERENCES:
patent: 3312106 (1967-04-01), Davis
patent: 4047521 (1977-09-01), Kramer et al.
patent: 4896541 (1990-01-01), Hughes
Frank M. White, McGraw-Hill, Inc., 1979, Table 72, "Fluid Mechanics".
Puritan-Bennett, 1991, 2.1-2.23, "Companion 318 Nasal CPAP System" (Service Manual).
Puritan-Bennett, Oct. 1992, 15-18, "Companion 318 Nasal CPAP System" (Clinical Manual).

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