SYSTEM AND METHOD FOR DETERMINING VENTILATOR LEAKAGE DURING STABLE PERIODS WITHIN A BREATH
First Claim
1. A method for identifying leakage in a respiratory gas supply system comprising:
- monitoring data indicative of at least one of pressure and flow in the respiratory gas supply system;
identifying that the data meet at least one stability criterion indicating that pressure and flow conditions have been stable for a period of time within a breath;
in response to the identifying operation, calculating leakage information based at least in part on the data taken during the period of time within the breath; and
determining a leakage rate after the period of time based at least in part on the leakage information.
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Abstract
This disclosure describes systems and methods for compensating for leaks in a ventilation system based on data obtained during periods within a breath in which the patient is neither inhaling nor exhaling. The methods and systems described herein more accurately and quickly identify changes in leakage. This information is then to estimate leakage later in the same breath or in subsequent breaths to calculate a more accurate estimate of instantaneous leakage based on current conditions. The estimated leakage is then used to compensate for the leak flow rates, reduce the patient'"'"'s work of breathing and increase the patient'"'"'s comfort (patient-ventilator breath phase transition synchrony).
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Citations
24 Claims
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1. A method for identifying leakage in a respiratory gas supply system comprising:
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monitoring data indicative of at least one of pressure and flow in the respiratory gas supply system; identifying that the data meet at least one stability criterion indicating that pressure and flow conditions have been stable for a period of time within a breath; in response to the identifying operation, calculating leakage information based at least in part on the data taken during the period of time within the breath; and determining a leakage rate after the period of time based at least in part on the leakage information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A respiratory gas supply system comprising:
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a pressure generating system capable of controlling the flow of breathing gas through a patient circuit and a patient interface to a patient; a stable period identification module that identifies a stable period within either an inhalation or an exhalation phase of a breath; and a leak compensation module that calculates leakage information using data obtained during the stable period identified by the stable period identification module and that calculates, during unstable periods within the breath or a later breath, an instantaneous leakage rate based on the leakage information. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for determining leakage from a respiratory gas supply system providing respiratory gas to a breathing patient comprising:
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identifying at least one stable period within a patient breath; calculating leakage information from pressure and flow data obtained during the at least one stable period; and subsequent to the stable period, estimating the leakage from the respiratory gas supply system based on the leakage information and current data. - View Dependent Claims (21, 22, 23, 24)
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Specification