Functional Characteristics of Artificial Ventilators

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Abstract
The functional characteristics of 5 ventilators, representative of pressure and volume constant apparatus, were studied on a lung model, wherein changes in respiratory compliances and airway resistances could be simulated. The ventilators were set to function at a given volume and rate over a range of three compliances[long dash]0.026, 0.069, and 0.111 liter/cm, and through a series of resistances from 0.45 to 46.3 cm of water/liter second. Changing pressures, flow characteristics and delivered volumes were recorded. The relative performance of the two classes of ventilators, as well as ventilators in each class are reported.

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