High frequency oscillation ventilator
AssigneeSiemens Elema AB
InventorJohan Bennarsten
Life of this patent
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Abstract
A high frequency oscillator (HFO) ventilator has an oscillator unit for alternately supplying a volume of gas (“oscillator volume”) to and removing the oscillator volume from a proximal end of a gas conduit at a predetermined high frequency. The gas conduit has a proximal end connectable to the oscillator unit and a distal end connectable with the patient's airways. Located between the proximal end and the distal end is an inlet for receiving a continuous flow of a bias gas from a supply, and an outlet. The ventilator further has a flow controller adapted to apportion, between the distal end of the conduit and the outlet, the volume of gas supplied by the oscillator unit to establish a predetermined inspiration tidal volume for delivery to the patient's airways independent of the oscillator volume.
Claims5
A high frequency oscillator ventilator comprising:
- a gas conduit having a first end, and a second end adapted for connection to a patient's airways;
- an oscillator unit connected to the first end of the gas conduit for alternating supplying a gas volume to, and removing a gas volume from, said first end of said gas conduit;
- an inlet for bias gas disposed between said first and second end of said conduit;
- an outlet disposed between said first and second ends of said conduit and cooperatively arranged with said inlet to delimit a bias gas flowpath;
- and
- a flow controller in communication with said gas conduit for apportioning, between said second end of said gas conduit and said outlet, the volume of gas supplied by said oscillator unit to establish a selectable inspiration tidal volume for delivery to the patient's airways, said flow controller comprising a size-variable restriction disposed within said gas conduit between said inlet and said second end of said gas conduit, said size-variable restriction being operable for regulating a resistance to gas flow between said first and second ends of said gas conduit as the size of said size-variable restriction is varied.
Dependencies are inferred from the claim text.