SYSTEMS AND METHODS FOR VENTILATION WITH UNRELIABLE EXHALATION FLOW AND/OR EXHALATION PRESSURE
First Claim
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1. A method for ventilating a patient with a ventilator, comprising:
- delivering a fixed base flow;
monitoring inspiratory pressure and exhalation flow during ventilation of a patient with a ventilator;
delivering ventilation based at least on the monitored exhalation flow;
triggering inspiration during the ventilation based at least on the monitored exhalation flow based on the first of at least one of the following events to occur;
detecting a first trigger condition; and
detecting expiration of a predetermined amount of time;
determining a malfunction that makes the monitored exhalation flow unreliable; and
in response to the malfunction;
ceasing ventilation based on the monitored exhalation flow;
estimating an exhalation flow based on the monitored inspiratory pressure;
delivering ventilation based at least on the estimated exhalation flow;
triggering inspiration during the ventilation based at least on the estimated exhalation flow based on the first of at least one of the following events to occur;
detecting a second trigger condition based at least on the estimated exhalation flow; and
detecting expiration of the predetermined amount of time.
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Abstract
This disclosure describes systems and methods for providing novel back-up ventilation that allows the patient to trigger or initiate the delivery of a breath. Further, this disclosure describes systems and methods for triggering ventilation when exhalation flow and/or exhalation pressure is unknown or unreliable by the ventilator.
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Citations
20 Claims
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1. A method for ventilating a patient with a ventilator, comprising:
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delivering a fixed base flow; monitoring inspiratory pressure and exhalation flow during ventilation of a patient with a ventilator; delivering ventilation based at least on the monitored exhalation flow; triggering inspiration during the ventilation based at least on the monitored exhalation flow based on the first of at least one of the following events to occur; detecting a first trigger condition; and detecting expiration of a predetermined amount of time; determining a malfunction that makes the monitored exhalation flow unreliable; and
in response to the malfunction;ceasing ventilation based on the monitored exhalation flow; estimating an exhalation flow based on the monitored inspiratory pressure; delivering ventilation based at least on the estimated exhalation flow; triggering inspiration during the ventilation based at least on the estimated exhalation flow based on the first of at least one of the following events to occur; detecting a second trigger condition based at least on the estimated exhalation flow; and detecting expiration of the predetermined amount of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A ventilator system comprising:
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a pressure generating system adapted to generate a flow of breathing gas including a fixed base flow; a ventilation tubing system including a patient interface for connecting the pressure generating system to a patient; an exhalation valve connected to the ventilation tubing system; a plurality of sensors operatively coupled to at least one of the pressure generating system, the patient, and the ventilation tubing system for monitoring inspiratory pressure, inspiratory flow, exhalation pressure, and exhalation flow; an exhalation flow estimation module, the exhalation flow estimation module estimates exhalation flow based on the monitored inspiratory pressure; a main driver, the main driver controls the exhalation valve to deliver ventilation to the patient based at least on at least one of the exhalation pressure and the exhalation flow monitored by the plurality of sensors; a main trigger module, the main trigger module triggers an inspiration based on the first of at least one of the following events to occur; detection of a first trigger condition, and expiration of a predetermined amount of time; a backup driver, the backup driver controls the exhalation valve to deliver the ventilation to the patient based on at least one of the inhalation pressure and the inhalation flow monitored by the plurality of sensors; a backup trigger module, the backup trigger module triggers the inspiration based on the first of at least one of the following events to occur; detection of a second trigger condition based at least on the estimated exhalation flow, and expiration of the predetermined amount of time; a controller, the controller determines a malfunction that makes the monitored exhalation flow unreliable and switches from the main driver and the main trigger module to the backup driver and the backup trigger module. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A computer-readable medium having computer-executable instructions for performing a method of ventilating a patient with a ventilator, the method comprising:
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repeatedly delivering a fixed base flow; repeatedly monitoring inspiratory pressure and exhalation flow during ventilation of a patient with a ventilator; repeatedly delivering ventilation based at least on the monitored exhalation flow; repeatedly triggering inspiration during the ventilation based at least on the monitored exhalation flow based on the first of at least one of the following events to occur; detecting a first trigger condition; and detecting expiration of a predetermined amount of time; determining a malfunction that makes the monitored exhalation flow unreliable; and
in response to the malfunction;ceasing ventilation based on the monitored exhalation flow; repeatedly estimating an exhalation flow based on the monitored inspiratory pressure; repeatedly delivering ventilation based at least on the estimated exhalation flow; repeatedly triggering inspiration during the ventilation based at least on the estimated exhalation flow based on the first of at least one of the following events to occur; detecting a second trigger condition based at least on the estimated exhalation flow; and detecting expiration of the predetermined amount of time.
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Specification