Method and apparatus for treating Cheyne-Stokes respiration
First Claim
1. A system for delivering a flow of breathing gas to an airway of a patient, the apparatus comprising:
- a gas flow/pressure generating system that generates a flow of breathing gas;
a patient circuit coupled to the gas flow/pressure generating system and adapted to communicate the flow of breathing gas to an airway of a patient;
monitoring means for monitoring a characteristic that varies based on variations of the flow of the breathing gas;
a controller that determines a Target Flow to be delivered to the patient based on the monitored characteristic, wherein the Target Flow is set to a level sufficient to treat Cheyne-Stokes Respiration (CSR) or a sleep disordered breathing event, wherein the controller determines whether such a patient is experiencing a sleep disordered breathing event, wherein the controller alters the Target Flow based on a determination that such a patient is experiencing a sleep disordered breathing event, wherein the controller determines an Instantaneous Average Inspiratory Flow (Qave(t)) during an inspiratory cycle based on an output of the monitoring means, wherein the controller determines a Maximum Average Inspiratory Flow (Qave(max)) as the maximum value for the Instantaneous Average Inspiratory Flow that occurred during the inspiratory cycle, wherein the controller compares the Qave(max) to the Target Flow, and wherein the controller controls the gas flow/pressure generating system to generate the flow of breathing gas delivered to the patient based on a result of this comparison.
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Abstract
A system and method for delivering a flow of breathing gas to an airway of a patient. A characteristic that varies based on variations of the flow of the breathing gas is monitored and used to determine a Target Flow for the gas delivered to the patient. The Target Flow is set to a level sufficient to treat Cheyne-Stokes respiration or a sleep disordered breathing event. The Target Flow is altered if the patient experiences a sleep disordered breathing event. In a further embodiment, the system determines an apnea detection time (Tapnea) as Tinsp plus a constant, and delivers a machine triggered breath if an amount since the start of inspiration reaches Tapnea. Yet another embodiment monitors the characteristic during an inspiratory phase of a respiratory cycle, and controls the flow of gas during the inspiratory phase of the respiratory cycle based on a result of this comparison.
80 Citations
16 Claims
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1. A system for delivering a flow of breathing gas to an airway of a patient, the apparatus comprising:
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a gas flow/pressure generating system that generates a flow of breathing gas; a patient circuit coupled to the gas flow/pressure generating system and adapted to communicate the flow of breathing gas to an airway of a patient; monitoring means for monitoring a characteristic that varies based on variations of the flow of the breathing gas; a controller that determines a Target Flow to be delivered to the patient based on the monitored characteristic, wherein the Target Flow is set to a level sufficient to treat Cheyne-Stokes Respiration (CSR) or a sleep disordered breathing event, wherein the controller determines whether such a patient is experiencing a sleep disordered breathing event, wherein the controller alters the Target Flow based on a determination that such a patient is experiencing a sleep disordered breathing event, wherein the controller determines an Instantaneous Average Inspiratory Flow (Qave(t)) during an inspiratory cycle based on an output of the monitoring means, wherein the controller determines a Maximum Average Inspiratory Flow (Qave(max)) as the maximum value for the Instantaneous Average Inspiratory Flow that occurred during the inspiratory cycle, wherein the controller compares the Qave(max) to the Target Flow, and wherein the controller controls the gas flow/pressure generating system to generate the flow of breathing gas delivered to the patient based on a result of this comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of delivering pressurized breathing gas to an airway of a patient, the method comprising the steps of:
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delivering a flow of gas to the airway of the patient from a source of breathing gas via a patient circuit; monitoring a characteristic that varies based on variations of the flow of the breathing gas; determining a Target Flow to be delivered to the patient based on the monitored characteristic, wherein the Target Flow is set to a level sufficient to treat Cheyne-Stokes respiration or a sleep disordered breathing event; determining whether such a patient is experiencing a sleep disordered breathing event; altering the Target Flow based on a determination that such a patient is experiencing a sleep disordered breathing event; and controlling the flow of breathing gas based on the Target Flow by determining an Instantaneous Average Inspiratory Flow (Qave(t)) during an inspiratory cycle based on the monitored characteristic, and then by determining a Maximum Average Inspiratory Flow (Qave(max)) as the maximum value for the Instantaneous Average Inspiratory Flow that occurred during the inspiratory cycle, and comparing the Qave(max) to the Target Flow, and delivering the flow of gas based on a result of this comparison. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification