Adjustment of target ventilation in a servoventilator
First Claim
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1. A servoventilator apparatus for delivering pressure support ventilation to a patient with alveolar hypoventilation during sleep comprising:
- a controller circuit;
an electric motor having an impeller under the control of the controller circuit that allows a flow of pressurized air to pass along an air delivery conduit to a patient interface to deliver the pressure support ventilation; and
means to allow setting a final target ventilation and a target ventilation ramp time;
the controller being operative to servo-ventilate the patient through said patient interface with said pressurized air in accordance with a set target ventilation, the target ventilation being a volume of gas to be breathed by the patient per unit time,wherein the controller changes the set target ventilation according to a programmed schedule from an initial target ventilation to the final target ventilation;
the target ventilation increasing at a determined rate over the target ventilation ramp time until it reaches the final target ventilation whereupon it stays constant thereafter,the ventilation ramp time being at least days long to prevent glottic closure or cessation of respiratory drive.
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Abstract
A servoventilator control slowly changes the target ventilation over a period of time, according to a preprogrammed schedule adapted to be set by the physician. Preferably, the target ventilation stays constant at an initial target ventilation for an initial hold time, and then increases at a constant rate until it reaches a final target ventilation, whereupon it stays constant thereafter. If the pressure support level is too high, possibly indicating glottic or upper airway closure, the rate of increase of target ventilation may be lowered or the final target ventilation not reached.
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Citations
10 Claims
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1. A servoventilator apparatus for delivering pressure support ventilation to a patient with alveolar hypoventilation during sleep comprising:
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a controller circuit; an electric motor having an impeller under the control of the controller circuit that allows a flow of pressurized air to pass along an air delivery conduit to a patient interface to deliver the pressure support ventilation; and means to allow setting a final target ventilation and a target ventilation ramp time; the controller being operative to servo-ventilate the patient through said patient interface with said pressurized air in accordance with a set target ventilation, the target ventilation being a volume of gas to be breathed by the patient per unit time, wherein the controller changes the set target ventilation according to a programmed schedule from an initial target ventilation to the final target ventilation; the target ventilation increasing at a determined rate over the target ventilation ramp time until it reaches the final target ventilation whereupon it stays constant thereafter, the ventilation ramp time being at least days long to prevent glottic closure or cessation of respiratory drive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification