Respiration detector

Details Respiration detector Respiration detector

1985-05-03

1987-03-10

Husar, Stephen F.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

128664, 128719, 250343, 356 51, A62B 700

Patent

active

046483969

ABSTRACT:
An improved method and apparatus for apnea detection is disclosed which features an infrared source and detector pair disposed on opposite sides of a cuvette through which the gas stream inhaled and exhaled by a patient is passed. The amount of CO.sub.2 in the exhaled stream is compared with that in the inhaled stream. Where the difference is greater than a predetermined amount, a breath is taken to be detected, thus avoiding the necessity of calibration of the apparatus against any absolute reference standard. The apparatus is disclosed in an inexpensive, readily manufacturable embodiment which is nevertheless highly immune to noise and highly sophisticated in the signal processing circuitry employed in detection of breathing. The apparatus additionally provides signals indicating obstruction in or detachment of the lines connecting the patient to the apparatus.

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