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Abstract

A single patient ventilator/resuscitator of the type which has a timed cycle of operation, but which a patient can override in response to his physiological needs. The ventilator/resuscitator has a source of oxygen, for example a chlorate candle (26), the oxygen source being associated with a filter (32) capable of filtering toxic or harmful contaminants from the atmosphere. Fluid operated delivery and control means are associated with the oxygen source and includes an air oxygen delivery means (20) shiftable between inspiratory and expiratory modes. When the delivery means is in the inspiratory mode at least a portion of the oxygen output is delivered to the patient (14), and when the delivery means is in the expiratory mode at least a portion of the oxygen output is delivered to an accumulator (54). The fluid operated control means (24) will cause the delivery means to cycle between its inspiratory and expiratory positions in a timed cycle established by timing modules (88, 89). The control means additionally includes pressure sensing devices (90, 92) which are capable of causing the control means (24) to shift the delivery means to an inspiratory mode when the patient initiates an inspiratory effort, and which are also capable of switching the delivery means to an expiratory mode when the pressure to the patient exceeds its set peak pressure.

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