Summary
A device is described which permits to obtain a signal at the beginning of in- or expiration respectively. This signal may be used to trigger an electrical stimulator. To permit studies at different states of lung inflation the tracheal cannula is connected to a spirometer circuit. To produce constant positive or negative air pressure this bellows-type spirometer is loaded with exchangeable metal weights. The tracheal pressure is recorded by means of a pressure transducer, the output of which is taken as signal. The device allows accurate compensation of the DC-component of the transducer output resulting from spirometer operation at a maintained positive or negative pressure.
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References
Fallert, M.: Atmungseffekte bei intermittierender elektrischer Reizung der Medulla oblongata zu verschiedenen Zeitpunkten des Atmungszyklus beim Kaninchen. Experientia (Basel)29, 1513–1515 (1973)
Fallert, M.: Inspiratory inhibition and rebound activation caused by intermittent bulbar and afferent vagal stimulation in the rabbit. Pflügers Arch.348, 167–184 (1974)
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We are indebted to Mr. G. Heintz for his help in the construction of the spirometer, to Mr. B. Mathew for his help in the development of the trigger circuit and to Dr. Ch. Spillmann for technical assistance. This work was supported by grant Fa 99/1 from the Deutsche Forschungsgemeinschaft.
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Fallert, M., Corinth, G. A device to trigger automatically electrical stimulation at different states of in- or expiration on the background of variable lung inflation in the rabbit. Pflugers Arch. 357, 139–143 (1975). https://doi.org/10.1007/BF00584551
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DOI: https://doi.org/10.1007/BF00584551