Patent ID: 6009871
Filing Date: 2000-01-04
Classification: A61M

Abstract:
A ventilating apparatus for ventilating a patient during inspiration and expiration phases, the apparatus comprising:a closed breathing loop;a dosing unit for dosing gases to said breathing loop needed for ventilating the patient thereby replenishing the quantity of respiratory gas consumed or lost to leakage;a respiratory gas pump unit connected to said closed breathing loop and said respiratory gas pump unit having a changeable volume so as to permit a predetermined pumped volume (V.sub.T) of said respiratory gas to be pumped into said breathing loop during said inspiration phase;a metering unit for metering a gas volume (V.sub.F) into said closed breathing loop during said inspiration phase;means for detecting said gas volume (V.sub.F) metered into said closed breathing loop by said metering unit during said inspiration phase;means for forming a difference volume (V.sub.T -V.sub.F) between said predetermined pumped volume (V.sub.T) and said gas volume (V.sub.F); and,means for applying said difference volume (V.sub.T -V.sub.F) as a new adjusting value for the volume of respiratory gas pumped by said respiratory gas pump unit.