Administration of CPAP treatment pressure in presence of apnea
First Claim
1. A control method for a processor in the administration of CPAP treatment pressure, comprising:
- controlling a flow generator for supplying breathable gas to a patient'"'"'s airway at a first treatment pressure;
controlling a determination of a measure of airflow;
controlling a detection of a reduction in the measure of airflow indicative of the presence of an apnea;
controlling a detection of a flow limitation in the measure of airflow;
in response to the detected indication of the presence of an apnea, dynamically adjusting a delta pressure amount due to apnea based at least in part on a comparison between the first treatment pressure and a top roll-off pressure value;
in response to the detected flow limitation, dynamically adjusting a delta pressure amount due to flow limitation independently of the top roll-off pressure value; and
controlling the flow generator for supplying breathable gas to the patient'"'"'s airway at a second treatment pressure based on the delta pressure amount due to apnea and the delta pressure amount due to flow limitation.
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Accused Products
Abstract
CPAP treatment apparatus is disclosed having a controllable flow generator (34, 38, 40) operable to produce breathable gas at a treatment pressure elevated above atmosphere to a patient by a delivery tube (32) coupled to a mask (30) having connection with a patient'"'"'s airway. A sensor (44, 50, 56, 58) generates a signal representative of patient respiratory flow, that is provided to a controller (54, 62, 64). The controller (54, 62, 64) is operable to determine the occurrence of an apnea from a reduction in respiratory airflow below a threshold, and if an apnea has occurred, to determine the duration of the apnea and to cause the flow generator (34, 38) to increase the treatment pressure. In one preferred form the increase in pressure is zero if the treatment pressure before the apnea exceeds a pressure threshold. Below the pressure threshold the increase in pressure is an increasing of the duration of the apnea multiplied by the between the pressure threshold and the current function difference treatment pressure.
166 Citations
18 Claims
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1. A control method for a processor in the administration of CPAP treatment pressure, comprising:
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controlling a flow generator for supplying breathable gas to a patient'"'"'s airway at a first treatment pressure; controlling a determination of a measure of airflow; controlling a detection of a reduction in the measure of airflow indicative of the presence of an apnea; controlling a detection of a flow limitation in the measure of airflow; in response to the detected indication of the presence of an apnea, dynamically adjusting a delta pressure amount due to apnea based at least in part on a comparison between the first treatment pressure and a top roll-off pressure value; in response to the detected flow limitation, dynamically adjusting a delta pressure amount due to flow limitation independently of the top roll-off pressure value; and controlling the flow generator for supplying breathable gas to the patient'"'"'s airway at a second treatment pressure based on the delta pressure amount due to apnea and the delta pressure amount due to flow limitation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A CPAP treatment apparatus, comprising:
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a flow generator operable to supply breathable gas to a mask at a first mask pressure; a tube coupled to the flow generator and adapted to deliver the breathable gas from the flow generator to the mask; a controller coupled to the flow generator and configured to control the mask pressure; and one or more sensors operable to provide a signal to the controller from which a measure of airflow is determined, wherein the controller is operable to; in response to a detected reduction in the measure of airflow that is indicative of an apnea, dynamically adjust a delta pressure amount due to apnea based at least in part on a comparison between the first mask pressure and a top roll-off pressure value; in response to a detected flow limitation in the measure of airflow, dynamically adjust a delta pressure amount due to flow limitation independently of the top roll-off pressure value; and control the mask pressure to a second mask pressure based on the delta pressure amount due to apnea and the delta pressure amount due to flow limitation. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification