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, the respiratory gas supply system having a controller adapted for delivering a flow of respiratory gases to a breathing patient, the method comprising:
- monitoring data indicative of at least one of pressure and flow in the respiratory gas supply system;
identifying, by the controller, 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 of a patient;
in response to the identifying that the data meet the at least one stability criterion, calculating leakage information based at least in part on the data identified during the period of time within the breath;
determining, by the controller, a leakage rate after the period of time based at least in part on the leakage information; and
adjusting at least one of a pressure and a flow delivered to the patient based on the determined leakage rate.
2 Assignments
0 Petitions
Accused Products
Abstract
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).
636 Citations
22 Claims
-
1. A method for identifying leakage in a respiratory gas supply system, the respiratory gas supply system having a controller adapted for delivering a flow of respiratory gases to a breathing patient, the method comprising:
-
monitoring data indicative of at least one of pressure and flow in the respiratory gas supply system; identifying, by the controller, 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 of a patient; in response to the identifying that the data meet the at least one stability criterion, calculating leakage information based at least in part on the data identified during the period of time within the breath; determining, by the controller, a leakage rate after the period of time based at least in part on the leakage information; and adjusting at least one of a pressure and a flow delivered to the patient based on the determined leakage rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A respiratory gas supply system comprising:
-
a pressure generating system configured to control flow of breathing gas through a patient circuit and a patient interface to a patient; and a computer controller communicatively coupled to the pressure generating system for adjusting the flow of breathing gas delivered to the patient, the computer controller configured to; identify a stable period within at least one of an inhalation phase and an exhalation phase of a breath; calculate leakage information using data obtained during the stable period identified by the stable period identification module; calculate, during unstable periods within the breath or a later breath, an instantaneous leakage rate based on the leakage information; and adjust at least one of a pressure and a flow delivered to the patient based on the determined leakage rate. - View Dependent Claims (14, 15, 16, 17)
-
-
18. A method for determining leakage from a respiratory gas supply system, the respiratory gas supply system having a controller adapted for providing respiratory gases to a breathing patient, comprising:
-
identifying, by the controller, at least one stable period within a breath of a patient; calculating leakage information from pressure and flow data obtained during the at least one stable period; subsequent to the at least one stable period, estimating, by the controller, a leakage from the respiratory gas supply system based on the leakage information and current data; and adjusting at least one of a pressure and a flow delivered to the patient based on the determined leakage. - View Dependent Claims (19, 20, 21, 22)
-
Specification