Journal of Applied Physiology
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J Appl Physiol 48: 567-568, 1980;
8750-7587/80 $5.00
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Journal of Applied Physiology, Vol 48, Issue 3 567-568, Copyright © 1980 by American Physiological Society

ARTICLES

An automatic sigh feature for animal ventilators

R. D. Gibson, D. G. Gisser and J. C. Newell

A device is described that provides a reliable automatic deep breath to an animal being ventilated with a typical laboratory ventilator. The deep breath is provided by closing a solenoid valve in the expiratory tubing causing the animal to inspire two, three, or four consecutive tidal volumes without expiration. The interval between deep breaths is selected to be every 1, 2, 4, 6, 8, or 10 min. Control of this interval is provided by simple integrated circuits. Total parts cost of this device is approximately $90.




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