Ultrasonic air flow transducer for high humidity environments

Details Ultrasonic air flow transducer for high humidity environments Ultrasonic air flow transducer for high humidity environments

1981-10-29

1984-01-17

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

128725, G01F 166

Patent

active

044258046

ABSTRACT:
A transducer assembly comprising an inner, primary, transducer having a pair of transducers fixed to a liner or cavity for providing the fluid compression sending and receiving signals for measuring the velocity and change of composition of fluid in the cavity which is being inspired and expired by a patient in a setting, such as in an intensive care unit of a hospital. The inner transducer is disposed in a heated housing to maintain the temperature of the inner transducer at a temperature above the saturation point of the fluid being measured and is further provided with (1) an acoustical absorber to prevent sound energy from the connection tubes, which connect the transducer assembly to endotracheal tubing, from adversely affecting fluid measurements and, (2) water absorbing material to prevent water, which might condense in the connecting tubing, from entering the inner transducer and affecting the fluid measurements.

REFERENCES:
patent: 2785911 (1957-03-01), Kaufman
patent: 3026868 (1962-03-01), Weinberg
patent: 3406783 (1968-10-01), Haffer
patent: 3575050 (1971-04-01), Lynnworth
patent: 4114607 (1978-09-01), Russo
patent: 4158360 (1979-06-01), Adams
patent: 4164865 (1979-08-01), Hall et al.
Telemetry of Respiratory Air Flow, 1972, H. P. Kimmich et al., Biotelemetry Internation Symposium, 5/5-8/71, pp. 111-120.
Acoustic Gas Analyzer, ISA Transactions, vol. 17, No. 1, Charles R. Tallman, 6/78 1978, pp. 97-104.
Anesthesiology, vol. 51, No. 2, 8/79, Sukled et al., Pneumotachography: A New, Low-Dead Space, Humidity-Ind. Device.

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