In-vivo measurement of end-tidal carbon monoxide concentration a

Details In-vivo measurement of end-tidal carbon monoxide concentration a In-vivo measurement of end-tidal carbon monoxide concentration a

1992-06-16

1994-03-15

Cohen, Lee S.

Surgery

Truss

Pad

12820422, 12820523, A61B 500

Patent

active

052938751

ABSTRACT:
A noninvasive device and methods for measuring the end-tidal carbon monoxide concentration in a patient's breath, particularly newborn and premature infants. The patient's breath is monitored. An average carbon monoxide concentration is determined based on an average of discrete samples in a given time period. The ratio of the end-tidal portion of the breath flow sample is separately determined, preferably based on monitoring the level of carbon dioxide in the gas sample and identifying the carbon dioxide concentration levels corresponding to the end-tidal portion of the breath sample. The sensed carbon monoxide level is converted to the end-tidal carbon monoxide level by subtracting the ambient carbon monoxide level and dividing the remainder by the ratio of end-tidal breath to breath in the breath sample. An easy to use microcontroller-based device containing a carbon dioxide detector, a carbon monoxide detect and a pump for use in a hospital, home, physician's office or clinic by persons not requiring high skill and training is described.

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Yeung et al. "Automatic End Expiratory Air Sampling Device for Breath Hydrogen Test in Infants, The Lancet", vol. 337, pp. 90-93 (Jan. 1991 Product Literature--Z-World Engineering Little Giant Minature Microcontroller (One page).
Product Literature--Servomex Mode 1505 Co.sub.2 Infrared Transducer borchure (2 pages) and technical note (9 pages).
Product literature--KNF Diaphragm Micro Pump Type NMP 02 (2 pages).

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