It then shows a lung in a tray, operated by bellows, oxygenating blood. Following the lung scene we are shown the operation of a primitive heart-lung machine, the autojektor (or autojector), composed of a pair of diaphragm linear pumps and what appears to be an oxygen bubble chamber. We then see it is supplying a canine head with oxygenated blood. The head is shown to respond to external stimuli, but the film does not show the arterial and venal connections to the head.
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