Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
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.
Mount Bruce E.
Rader Con D.
Dwyer J. R.
Masselle F. L.
Murphy T. P.
Noland Tom
Ruehl Charles A.
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