Fig. 1
From: Accuracy of P0.1 measurements performed by ICU ventilators: a bench study
Experimental setup. A chamber of a two-chamber test lung was connected to a driving ventilator set in volume-controlled ventilation mode. The second chamber (2) was connected to the tested ventilator by a double limb circuit with an active humidifier. The two chambers of the test lung were linked by a rigid metal piece, so that the positive pressure insufflated by the driving ventilator into the first chamber (1) generates a negative pressure in the second chamber, recognized as an inspiratory effort by the tested ventilator. Data were acquired via an analog-to-digital converter and stored in a laptop computer for subsequent analysis