Servo ventilation using pressure drop from baseline
First Claim
1. A system for delivering a flow of breathing gas to an airway of a patient, the system comprising:
- a gas flow generator configured to generate the flow of gas;
a patient circuit coupled to the gas flow generator configured to communicate the flow of gas to an airway of the patient;
a sensor configured to generate output signals related to one or more parameters associated with the flow of gas; and
a controller configured to;
control the flow of breathing gas to the airway of the patient via the patient circuit,provide an inspiratory pressure level during inspiration and an expiratory pressure level during expiration, anddetermine the inspiratory pressure level and the expiratory pressure level based on the one or more parameters associated with the flow of gas such that, responsive to the one or more parameters indicating a hyperneic phase of Cheyne-Stokes Respiration, the expiratory pressure level becomes greater than the inspiratory pressure level.
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Accused Products
Abstract
A system and method for delivering a flow of breathing gas to an airway of a patient that includes a gas flow generator and a patient circuit that communicates the flow of gas to an airway of a patient. A sensor measures a characteristic associated with the flow of gas, such as flow rate. A controller determines a first characteristic based on the measured characteristic and a target of the flow of gas to be delivered to the patient. The controller controls the delivery of gas to the patient by 1) providing a baseline positive pressure support amount to the patient and 2) providing a modified pressure support amount by reducing the baseline amount by a given amount if the first characteristic is above the target. The baseline pressure includes a pressure provided during inspiration that is higher than a pressure provided during expiration.
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Citations
23 Claims
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1. A system for delivering a flow of breathing gas to an airway of a patient, the system comprising:
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a gas flow generator configured to generate the flow of gas; a patient circuit coupled to the gas flow generator configured to communicate the flow of gas to an airway of the patient; a sensor configured to generate output signals related to one or more parameters associated with the flow of gas; and a controller configured to; control the flow of breathing gas to the airway of the patient via the patient circuit, provide an inspiratory pressure level during inspiration and an expiratory pressure level during expiration, and determine the inspiratory pressure level and the expiratory pressure level based on the one or more parameters associated with the flow of gas such that, responsive to the one or more parameters indicating a hyperneic phase of Cheyne-Stokes Respiration, the expiratory pressure level becomes greater than the inspiratory pressure level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of ventilating a patient, comprising:
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delivering a flow of gas to an airway of a patient from a source of breathing gas via a patient circuit; measuring a first characteristic associated with the flow of gas; determining a target of the flow of gas to be delivered to the patient; and controlling the delivery of the flow of gas to the airway of the patient from a gas flow generator via the patient circuit by; 1) delivering the flow of gas to the airway of the patient at an inspiratory pressure level during inspiration and an expiratory pressure level during expiration, 2) determining the inspiratory pressure level and the expiratory pressure level based on the first characteristic associated with the flow of gas, and 3) controlling the flow of gas such that the expiratory pressure level is greater than the inspiratory pressure level responsive to the first characteristic indicating a hyperneic phase of Cheyne-Stokes Respiration. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system for ventilating a patient, comprising:
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means to generate a flow of gas; means to deliver a flow of gas to an airway of a patient from the means to generate the flow of gas; means to generate output signals related to one or more parameters associated with the flow of gas; means to control the flow of breathing gas to the airway of the patient via the patient circuit; means to provide an inspiratory pressure level during inspiration and an expiratory pressure level during expiration; and means to determine the inspiratory pressure level and the expiratory pressure level based on the one or more parameters associated with the flow of gas such that, responsive to the one or more parameters indicating a hyperneic phase of Cheyne-Stokes Respiration, the expiratory pressure level is greater than the inspiratory pressure level. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification