Ventilator leak compensation
First Claim
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1. A ventilator, comprising:
- a pneumatic system for providing and receiving breathing gas;
a component for fluidly coupling the pneumatic system to a patient, wherein the component comprises a leak-susceptible orifice that varies in size during operation of the ventilator as a direct function of an applied pressure; and
a controller operatively coupled with the pneumatic system, wherein the controller is configured to;
control delivery of breathing gas to the patient, andadjust at least one of a volume and pressure of breathing gas delivered to the patient to account for leakage from the pneumatic system, the adjustment based on the varying size of the leak-susceptible orifice.
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Abstract
A ventilator including a pneumatic system for providing and receiving breathing gas, and a controller operatively coupled with the pneumatic system. The controller is operable to control circulation by the pneumatic system of breathing gas to and from a patient, and to adjust at least one of a volume and pressure of breathing gas delivered to the patient, such adjustment being based upon elastic properties of a component used to fluidly couple the pneumatic system to a patient.
675 Citations
20 Claims
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1. A ventilator, comprising:
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a pneumatic system for providing and receiving breathing gas; a component for fluidly coupling the pneumatic system to a patient, wherein the component comprises a leak-susceptible orifice that varies in size during operation of the ventilator as a direct function of an applied pressure; and a controller operatively coupled with the pneumatic system, wherein the controller is configured to; control delivery of breathing gas to the patient, and adjust at least one of a volume and pressure of breathing gas delivered to the patient to account for leakage from the pneumatic system, the adjustment based on the varying size of the leak-susceptible orifice. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A ventilator, comprising:
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a pneumatic system for circulating breathing gas to and from a patient; an airway including a patient interface and a breathing circuit for fluidly coupling the pneumatic system with a patient, wherein the airway comprises a leak-susceptible orifice that varies in size as a direct function of an applied pressure; and a controller operatively coupled with the pneumatic system, wherein the controller is configured to; control delivery of breathing gas to the patient; derive the varying size of the leak-susceptible orifice based on an elastic modulus of the airway and the applied pressure; and adjust the delivery of breathing gas based on the varying size of the leak-susceptible orifice. - View Dependent Claims (9, 10, 11)
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12. In a ventilator having a pneumatic system and an airway adapted to fluidly couple the pneumatic system to a patient, a leak compensation method, comprising:
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providing a baseline level of leak compensation based upon a size of a leak-susceptible orifice in the airway; deriving elastic properties of a component of the airway containing the leak-susceptible orifice based at least in part on material properties of the component; adjusting the baseline level of leak compensation in response to a pressure sufficient to cause deformation of the leak-susceptible orifice, wherein an extent of the deformation of the leak-susceptible orifice is based upon the elastic properties of the component and is a direct function of the pressure, and wherein a magnitude of the adjustment is based on the elastic properties of the component. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A ventilator, comprising:
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a pneumatic system for providing and receiving breathing gas; an airway including a patient interface and a breathing circuit for fluidly coupling the pneumatic system with a patient; and a controller operatively coupled with the pneumatic system, where the controller is configured to; control a flow of breathing gas to the patient, and make dynamic adjustments in the flow of the breathing gas to compensate for a leak in the airway, where the dynamic adjustments are based at least in part on rigid leak properties of a fixed-size orifice of the airway and elastic leak properties of a variable-size orifice of the airway, and where the elastic leak properties of the variable-size orifice of the airway are a direct function of an applied pressure. - View Dependent Claims (20)
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Specification