Method and device for reduction of rebreathing of gas from dead space
AssigneeSiemens Elema AB
InventorsBjorn Jonson, Sven-Gunnar Olsson
Life of this patent
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Abstract
In a method and apparatus for reducing rebreathing of gas from the dead space (i.e., the volume of used gas, which during expiration has filled the airways and is brought back to the alveus at the following inspiration), at least during the final phase of expiration, a flow of used breathing gas is artificially evacuated from the patient through a gas conduit inserted into the patient's airway, the flow rate of evacuated gas being greater than the flow rate of the expiration gas which is being exhaled by the patient at the time. A flow of breathable gas is simultaneously supplied to the patient through gas conduit inserted in the airway, which may be the same conduit as is used for evacuation or a different conduit.
Claims7
In a respiration-assist system, a method for reducing rebreathing of gas from dead space comprising the steps of:
- during a final phase of expiration of a patient, artificially evacuating a flow of used gas from the patient through a first gas conduit inserted into the patient's airway, the flow rate of used gas being evacuated being greater than the flow rate of expiration gas then being exhaled by the patient;
- and
- simultaneously supplying a flow of breathable gas to the patient through a second gas conduit inserted into the patient's airway.
In a respiration-assist system incorporating a respirator and an apparatus for reducing rebreathing of gas from dead space, comprising:
- a tracheal tube insertable into the airway of a patient, connected to said respirator and supplying breathing gas to and from the patient;
- a gas conduit inserted into the patient's airway with said tracheal tube, and receiving expired gas from the patient, the expired gas in said gas conduit constituting used gas;
- means for providing an underpressure in said gas conduit;
- means for determining a final phase of expiration of said patient;
- means for initiating said underpressure in said gas conduit during said final phase of expiration for evacuating said used gas from the patient through said gas conduit;
- and
- means for supplying breathable gas from said respirator to the patient through said tracheal tube during said final phase of expiration.
Dependencies are inferred from the claim text.