The ideal respirator should incorporate some sort of control by the patient, so that frequency and depth will be instantly adjusted if the patient begins to breathe spontaneously. If the patient initiates his own breathing, the automatic cycling of the respirator should stop, so as to allow him to do his own breathing without interference. The Pesty positive-negative pressure respirator makes it possible to give artificial respiration by a process of active inflation and deflation at amplitudes and frequencies determined by the operator. No source of electricity is needed, since the required energy is supplied by the compressed air. Mixture of anesthetic gases can be administered in place of compressed air.
Trémolières J. A NEW APPARATUS FOR ARTIFICIAL RESPIRATION. JAMA. 1958;167(9):1086–1089. doi:10.1001/jama.1958.02990260028007
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