The transparent plastic tank respirator during ventilation of the second patient (Table 1). The tank covered the whole patient, including the head. This setting improves the practicability of continuous external negative-pressure ventilation in an intubated patient in whom flow is delivered from the conventional mechanical ventilator through the endotracheal tube. Apertures in the bottom, below the wooden frame, were used to lead out all connections to the patient, and trimmed-to-fit sponge rubbers were used to seal these apertures. (The shoes were put on this patient to prevent contractions.).