Carbon dioxide-based Bi-level CPAP Control
First Claim
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1. A method of providing a breathing gas comprising the steps of:
- sensing a carbon-dioxide level associated with a patient breathing interface;
determining if the level of carbon-dioxide is increasing or decreasing;
if the level is decreasing, determining if the level of carbon-dioxide has crossed a threshold parameter;
if the carbon-dioxide level has crossed the threshold parameter, increasing the breathing gas pressure provided to the patient breathing interface;
decreasing the breathing gas pressure provided to the patient breathing interface after a predetermined period of time; and
the increasing and decreasing of breathing gas pressure maintaining a positive pressure sufficient to sustain open the airway of a patient wearing the breathing interface.
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Abstract
A system and method of providing bi-level CPAP therapy is provided that incorporates an infrared carbon-dioxide sensor to determine whether a patient is inhaling or exhaling. Patient exhalation causes the infrared light to be absorbed, while patient inhalation reduces the presence of carbon-dioxide causes little or no absorption of carbon-dioxide. The level of carbon-dioxide in an associated patient breathing interface is monitored for thresholds that trigger higher CPAP pressure upon inhalation and lower CPAP pressure upon exhalation.
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Citations
28 Claims
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1. A method of providing a breathing gas comprising the steps of:
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sensing a carbon-dioxide level associated with a patient breathing interface;
determining if the level of carbon-dioxide is increasing or decreasing;
if the level is decreasing, determining if the level of carbon-dioxide has crossed a threshold parameter;
if the carbon-dioxide level has crossed the threshold parameter, increasing the breathing gas pressure provided to the patient breathing interface;
decreasing the breathing gas pressure provided to the patient breathing interface after a predetermined period of time; and
the increasing and decreasing of breathing gas pressure maintaining a positive pressure sufficient to sustain open the airway of a patient wearing the breathing interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of providing a breathing gas to a patient comprising the steps of:
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sensing a carbon-dioxide level associated with a patient breathing interface;
determining if the sensed level of carbon-dioxide is increasing or decreasing;
if the sensed carbon-dioxide level is increasing, determining if the sensed carbon-dioxide level has crossed a first threshold parameter;
if the sensed carbon-dioxide level has crossed the first threshold parameter, decreasing the breathing gas pressure provided to the patient breathing interface;
if the sensed carbon-dioxide level is decreasing, determining if the sensed carbon-dioxide level has crossed a second threshold parameter;
if the sensed carbon-dioxide level has crossed the second threshold parameter, increasing the breathing gas pressure provided to the patient breathing interface; and
the increasing and decreasing of breathing gas pressure maintaining a positive pressure sufficient to sustain open the airway of a patient wearing the breathing interface. - View Dependent Claims (11, 12, 13, 14, 15, 16, 18, 19, 20)
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17. A method of providing a breathing gas to a patient comprising the steps of:
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sensing a carbon-dioxide level associated with a patient breathing interface;
determining if the sensed level of carbon-dioxide is increasing or decreasing;
if the sensed level of carbon-dioxide is decreasing, determining whether the sensed level of carbon-dioxide at or below a threshold level;
if the sensed level of carbon-dioxide is at or below the threshold level, increasing the pressure of the breathing gas for a fixed period of time;
decreasing the pressure of the breathing gas upon expiration of the fixed period of time;
the increasing and decreasing of the pressure of the breathing gas maintaining a positive pressure sufficient to sustain open the airway of the patient.
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21. A method of administering a CPAP therapy comprising the steps of:
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monitoring the level of carbon-dioxide vented from a patient breathing interface;
if the level of carbon-dioxide vented is decreasing, determining of the level of carbon-dioxide is at or below a threshold value;
if the level of carbon-dioxide vented is at or below the threshold value, providing a first positive airway pressure to the patient breathing interface for a fixed period of time; and
upon the expiration of the fixed period of time providing a second positive airway pressure to the patient breathing interface.
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22. A system for administering a breathing gas to a patient breathing interface comprising:
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(a) a blower for providing positive pressure breathing gas;
(b) a controller in circuit communication with the blower;
(c) an infrared light emitter and detector in circuit communication with the controller for detecting the level of carbon-dioxide associated with the patient breathing interface; and
(d) logic for increasing and decreasing the level of the positive pressure breathing gas based on the level of carbon-dioxide detected to maintain open the airway of a patient. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification