Measuring and testing – Volume or rate of flow – Thermal type
Patent
1980-08-12
1982-12-14
Howell, Kyle L.
Measuring and testing
Volume or rate of flow
Thermal type
128724, 128725, G01F 168, A61B 508
Patent
active
043632386
ABSTRACT:
In a device for measuring the breath volume of patients, a pair of temperature sensitive sensors are arranged in a tube-like housing of a respiration conduit of a respirator. The sensors are spaced from one another in flow direction and an air resistance member is arranged between them in such way that at least in one of the opposite air flow directions one of the sensors is in a position sheltered from the air flow by the air resistance member. Both of the sensors are connected with electronic circuits respectively and a current supply for holding the temperatures of the sensors on constant high levels. A calorimeter unit is connected to the circuits measuring the current supply necessary to compensate the temperature decrease of the sensors caused by the cool respiration flow. The air throughput is calculated in dependence on the measured current supply. Because in a predetermined flow direction the leeward sensor with respect to the air resistance member needs a lower current supply than the upstream sensor the calculating device provides different outputs for the pair of sensors whereby the flow direction can be determined and only the expiration air volume is indicated.
REFERENCES:
patent: 3147618 (1964-09-01), Benson
patent: 3535927 (1970-10-01), Mahon et al.
patent: 3592055 (1971-07-01), Dorman
patent: 3595079 (1971-07-01), Grahn
patent: 3677085 (1972-07-01), Hayakawa
patent: 3900819 (1975-08-01), Djorup
patent: 3962917 (1976-06-01), Terada
patent: 4024761 (1977-05-01), Djorup
patent: 4206638 (1980-06-01), Djorup
Gunkel, A. et al., "A Shielded Hot-Wire Probe. . ." Ind. Eng. Chem. Fund., vol. 10, No. 4, 1971 pp. 627-631.
Hanley John C.
Howell Kyle L.
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