Oxygen mixing in a blower-based ventilator
First Claim
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1. Apparatus for delivering pressurized gas to the airway of a patient, said apparatus comprising:
- gas flow generator means for providing a flow of said gas;
conduit means for delivery of said gas flow to the airway of the patient;
said conduit means comprising at least one primary conduit portion for carrying a primary flow of said gas towards the airway of said patient;
means for providing supplemental oxygen to the patient concomitantly with the provision of the primary flow of said gas to the patient;
said means for providing supplemental oxygen comprising;
means for introducing a flow of supplemental oxygen into said at least one primary conduit portion of said apparatus;
means for metering the flow of supplemental oxygen into said at least one primary conduit portion of said apparatus;
said metering means comprising means for regulating the flow of supplemental oxygen into said at least one primary conduit portion of said apparatus as a function of at least one of;
the magnitude of said primary flow in said at least one main conduit portion; and
the direction of said primary flow in said at least one main conduit portion.
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Abstract
An oxygen mixing arrangement for or in a pressure support ventilator, in which a modular oxygen-providing assembly is selectively insertable into a greater respiration apparatus. Mixing accuracy and controllability is maintained by using gas supplies that have a wide range of pressures. Further, oxygen leakage is minimized by connecting the modular oxygen-providing assembly at a point of the respiration circuit of the greater respiration apparatus that is downstream from a valving arrangement normally used for venting patient exhaust flow and for controlling system pressure by venting excess gas flow to the ambient atmosphere.
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Citations
20 Claims
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1. Apparatus for delivering pressurized gas to the airway of a patient, said apparatus comprising:
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gas flow generator means for providing a flow of said gas; conduit means for delivery of said gas flow to the airway of the patient; said conduit means comprising at least one primary conduit portion for carrying a primary flow of said gas towards the airway of said patient; means for providing supplemental oxygen to the patient concomitantly with the provision of the primary flow of said gas to the patient; said means for providing supplemental oxygen comprising; means for introducing a flow of supplemental oxygen into said at least one primary conduit portion of said apparatus; means for metering the flow of supplemental oxygen into said at least one primary conduit portion of said apparatus; said metering means comprising means for regulating the flow of supplemental oxygen into said at least one primary conduit portion of said apparatus as a function of at least one of; the magnitude of said primary flow in said at least one main conduit portion; and the direction of said primary flow in said at least one main conduit portion. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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4. Method of controlling the pressure of gas flow delivered to the airway of a patient in apparatus for delivering pressurized gas to the airway of a patient, such apparatus comprising gas flow generator means for providing a flow of gas and conduit means for delivery of said gas flow to the airway of the patient;
- said method comprising the steps of;
carrying, in said conduit means, a primary flow of said gas towards the airway of said patient; providing supplemental oxygen to the patient concomitantly with the provision of the primary flow of said gas to the patient; said step of providing supplemental oxygen comprising the steps of; introducing a flow of supplemental oxygen into said at least one primary conduit portion of said apparatus; metering the flow of supplemental oxygen into said at least one primary conduit portion of said apparatus; said metering step comprising the step of regulating the flow of supplemental oxygen into said at least one primary conduit portion of said apparatus as a function of at least one of; the magnitude of said primary flow in said at least one main conduit portion; and the direction of said primary flow in said at least one main conduit portion.
- said method comprising the steps of;
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14. Modular apparatus for delivering pressurized gas to the airway of a patient, said apparatus comprising:
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at least one first modular section comprising; gas flow generator means for providing a flow of said gas; and conduit means for delivery of said gas flow to the airway of the patient; said conduit means comprising at least one primary conduit portion for carrying a primary flow of said gas towards the airway of said patient; at least one second modular section comprising; means for providing supplemental oxygen to the patient concomitantly with the provision of the primary flow of said gas to the patient; said means for providing supplemental oxygen comprising; means for introducing a flow of supplemental oxygen into said at least one primary conduit portion of said apparatus; and means for metering the flow of supplemental oxygen into said at least one primary conduit portion of said apparatus; wherein at least one of; said at least one first modular section; and said at least one second modular section; comprises two or more interchangeable modular sections, to permit the selective assembly of at least two different apparatus for delivering pressurized gas to the airway of a patient. - View Dependent Claims (15, 16, 17, 18, 19)
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20. Apparatus for delivering pressurized gas to the airway of a patient, said apparatus comprising:
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gas flow generator means for providing a flow of said gas; conduit means for delivery of said gas flow to the airway of the patient; means for providing a supplemental gas to the patient concomitantly with the provision of said gas flow to the patient; said means for providing a supplemental gas comprising means for regulating the flow of supplemental gas as a function of at least one of;
the magnitude of the gas flow provided by said gas flow Generator means and the direction of the gas flow provided by said gas flow generator means.
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Specification