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A respirator comprises a respiratory air circulation unit with an adjustable displacement volume and a respiratory air supply line and a respiratory system comprising an inspiration loop, an expiration loop and valve elements mounted in these loops. The valve elements are controllable by means of a

A respirator comprises a respiratory air circulation unit with an adjustable displacement volume and a respiratory air supply line and a respiratory system comprising an inspiration loop, an expiration loop and valve elements mounted in these loops. The valve elements are controllable by means of a control unit, so that small as well as large displacement volumes can be executed by means of a single circulation unit with the smallest space requirements possible. For this purpose the inspiration phase is divided into several sub-phases, during which the control unit controls the valve elements and the respiratory air circulation unit 4 so that several fillings of the adjustable displacement volume are supplied to the inspiration loop and only then is the expiration phase initiated. Thus the displacement volume of the circulation unit can be kept small. One or a few inspiration sub-phases are sufficient for the artificial respiration of infants and premature infants, while a multitude of sub-phases can be executed for the artificial respiration of adults with a large respiratory volume.

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A respirator, comprising a respiratory air circulation unit having a movable stroke device with an adjustable displacement volume, a respiratory air supply line, a respiratory system connected to said air supply line comprising an inspiration loop, and an expiration loop, a valve element mounted in

A respirator, comprising a respiratory air circulation unit having a movable stroke device with an adjustable displacement volume, a respiratory air supply line, a respiratory system connected to said air supply line comprising an inspiration loop, and an expiration loop, a valve element mounted in each of said inspiration loop and expiration loop, a control unit connected to each of said valve elements and to said respiratory air circulation unit for controlling the strokes of said unit, said unit having a volume capacity set to cause said unit stroke device to execute at least two consecutive complete filling and emptying strokes during each inspiration before expiration takes place.