Summary
A description is presented of an internal ventilator which has the following features: (1) patient-triggering with guaranteed minimum frequency; (2) constant volume or constant ventilation as determined by the physician; (3) continuous, automatic monitoring of expired air tidal volume; (4) optional negative phase when ventilation is maintained at constant levels; (5) control over inspiratory flow rate and air-oxygen ratios. The ventilator has been tested under laboratory conditions and in separate series of short-term and long-term applications, and has been found useful because it provides the responsiveness and flexibility of patient-triggered apparatus, the basic security of constant ventilation or guaranteed minimum ventilation, and an automated system for monitoring ventilation. The rationale for design of a ventilator with these refinements is discussed and relates to the present population of patients requiring mechanical aid to ventilation.
Résumé
On présente la description d’un ventilateur interne qui a les caractéristiques suivantes:
-
(1)
déclenchement par le malade avec un minimum garanti de fréquence;
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(2)
un volume constant ou une ventilation constante tel que prescrit par le médecin;
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(3)
un contrôle continuel, automatique du volume d’air courant expiré;
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(4)
une phase négative facultative quand la ventilation est maintenue à des niveaux constants;
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(5)
un contrôle sur le flot inspiratoire et sur les rapports air/oxygène. Le ventilateur a été éprouvé en laboratoire et en séries d’application séparées à long et à court terme, et il a été trouvé utile parce qu’il a la sensibilité et la flexibilité d’un appareil déclenché par le malade; il garantit la sécurité primordiale d’une ventilation constante ou d’une ventilation minimale, et il est muni; d’un système automatique pour contrôler la ventilation.
La raison d’être d’un appareil possédant tous ces raffinements est démontrée, et l’on rappelle le nombre de malades qui peuvent bénéficier d’une aide mécanique à la ventilation.
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This study was supported in part by U.S. Public Health Service Grant PN-2014 and by a grant from the Hendricks Fund.
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Auchincloss, J.H. A new ventilator designed to meet the present-day needs of mechanical aid to ventilation in the treatment of respiratory failure. Can. Anaes. Soc. J. 12, 11–28 (1965). https://doi.org/10.1007/BF03004074
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DOI: https://doi.org/10.1007/BF03004074