A ventilating apparatus includes a closed breathing loop (3) which is supplied with the gases needed for ventilation via a metering unit (9). The ventilating apparatus is improved in such a manner that the respiratory gas can be metered during the inspiration phase without affecting the respiratory gas stroke volume supplied to the patient. The ventilating apparatus includes a flow-measuring device (14) for detecting a gas volume (V.sub.F) which is metered into the closed breathing loop (3) during the inspiration phase. A subtraction element (16) forms a difference volume (V.sub.T -V.sub.F) between the pump volume (V.sub.T) and the gas volume (V.sub.F). A switch (21) permits utilizing the difference volume (V.sub.T -V.sub.F) as a new adjusting value for the pump volume of the respiratory gas pump unit (2).

With closed respiratory systems, the patient's respiratory tract is tightly connected to a closed volume to which breathing gas is supplied only in the amount taken in by the patient. To this end, the breathing gas supply must be controlled. The controlled variable is either the pressure in the ventilating circuit, or the concentration of oxygen or the anesthetic gas in the breathing gas. A dropping pressure indicates either an increased consumption or a leak. To avoid insufficient or excessive loading of the patient, it is very important to be able to distinguish consumption from a leak. The inventive device makes this distinction possible. The breathing gas amounts are adjusted in the ventilating circuit at preset different pressures and are compared with each other, and the leak portion is computed therefrom.

【課題】ユーザーに対し十分に酸素を供給することができる呼吸同調器を提供する。
【解決手段】ユーザーの呼吸に合わせて当該ユーザーに酸素を供給する呼吸同調器１。前記ユーザーの吸気を検知する吸気センサ１５と、当該吸気センサ１５の検知に基づいて前記ユーザーの呼吸間隔を算出する算出部と、当該算出部により算出された前記ユーザーの呼吸間隔の変化に基づいて当該ユーザーの呼吸状態を判断する判断部とを備えている。前記ユーザーの呼吸間隔の変化が所定の閾値を複数回超える場合に、前記判断部は、当該ユーザーの呼吸に合わせた酸素供給が行われていないと判断する。
【選択図】図１