Fig. 4
Volume control mode: testing of Vent-Lock ventilator multiplexer with a ventilator or anesthesia gas machine on volume control mode ventilating two simulated patients with different lung compliances. A With the ventilator on volume control, decreases in variable patient tidal volumes result in increases in tidal volumes delivered to the standard patient. This indicates that in volume control mode, patient ventilation circuits are interdependent, and changes in one patient effects the other. B The ratios of the patient’s tidal volumes (standard patient/variable patient) per closure of the Vent-Lock FloRest with ventilators on volume control. C On ventilator volume control and with Vent-Lock FloRest closure, the changes in peak inspiratory pressure (PIP) of the standard patient and variable patient reflect that of tidal volume changes, while the ventilator reported PIP and Pavg increase, and PEEP remains stable. D Vent-Lock FloRest was tested at Washington University in St. Louis using anesthesia gas machines. The FloRest can be used to control delivered tidal volumes to the variable patient on both pressure and volume control on anesthesia gas machines