Ventilating apparatus
First Claim
1. 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 (VT) of said respiratory gas to be pumped into said breathing loop during said inspiration phase;
a metering unit for metering a gas volume (VF) into said closed breathing loop during said inspiration phase;
means for detecting said gas volume (VF) metered into said closed breathing loop by said metering unit during said inspiration phase;
means for forming a difference volume (VT -VF) between said predetermined pumped volume (VT) and said gas volume (VF); and
,means for applying said difference volume (VT -VF) as a new adjusting value for the volume of respiratory gas pumped by said respiratory gas pump unit.
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Accused Products
Abstract
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 (VF) which is metered into the closed breathing loop (3) during the inspiration phase. A subtraction element (16) forms a difference volume (VT -VF) between the pump volume (VT) and the gas volume (VF). A switch (21) permits utilizing the difference volume (VT -VF) as a new adjusting value for the pump volume of the respiratory gas pump unit (2).
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Citations
2 Claims
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1. A ventilating apparatus for ventilating a patient during inspiration and expiration phases, the apparatus comprising:
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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 (VT) of said respiratory gas to be pumped into said breathing loop during said inspiration phase; a metering unit for metering a gas volume (VF) into said closed breathing loop during said inspiration phase; means for detecting said gas volume (VF) metered into said closed breathing loop by said metering unit during said inspiration phase; means for forming a difference volume (VT -VF) between said predetermined pumped volume (VT) and said gas volume (VF); and
,means for applying said difference volume (VT -VF) as a new adjusting value for the volume of respiratory gas pumped by said respiratory gas pump unit. - View Dependent Claims (2)
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Specification