Gas Supply Device for Sleep Apnea
2 Assignments
0 Petitions
Accused Products
Abstract
An apparatus is provided for controlling air supplied under pressure to a patient suffering from sleep disorders such as apnoea. The apparatus measures and/or calculates the inspiratory air flow, volume and pressure to the airway. Controlled pressurized air is supplied to the patient'"'"'s upper anatomical airway, wherein the apparatus measures the air flow and pressure to the airway. The apparatus determines whether to increase or decrease the pressure to the patient'"'"'s airway based on a determination of one or more factors, such as the occurrence of hypopnoea, hyperventilation, obstructive or central apnoea, air leakage and acoustical vibrations. Occurrences of events representing a sleep problem may be stored by the apparatus and retrieved by a clinician at a later date.
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Citations
38 Claims
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1-20. -20. (canceled)
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21. A method for managing gas delivery to a patient, comprising:
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delivering gas to a patient; determining a flow amplitude for each of a first plurality of breath cycle cycles; determining a mean of the determined flow amplitudes for the first plurality of breath cycles; determining a flow amplitude for a particular breath cycle occurring subsequent to the first plurality of breath cycles; identifying the particular breath cycle as a hypoventilated breath cycle if the flow amplitude for the particular breath cycle is less than the product of the determined mean flow amplitude for the first plurality of breath cycles and a first factor; and determining whether to increase the pressure of gas delivered to the patient based at least on whether the particular breath cycle is identified as a hypoventilated breath cycle. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A breathing assistance apparatus, comprising:
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a pressure supply module configured to supply pressurized air toward a patient; at least one sensor configured to monitor air supplied by the pressure supply module; and a pressure control unit coupled to the pressure supply module, the pressure control unit configured to; determine a flow amplitude for each of a first plurality of breath cycle cycles; determine a mean of the determined flow amplitudes for the first plurality of breath cycles; determine a flow amplitude for a particular breath cycle occurring subsequent to the first plurality of breath cycles; identify the particular breath cycle as a hypoventilated breath cycle if the flow amplitude for the particular breath cycle is less than the product of the determined mean flow amplitude for the first plurality of breath cycles and a first factor; and determine whether to increase the pressure of gas delivered to the patient based at least on whether the particular breath cycle is identified as a hypoventilated breath cycle. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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38. Software for managing gas delivery to a patient, the software embodied in tangible computer-readable media and when executed by a processor, configured to:
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determine a flow amplitude for each of a first plurality of breath cycle cycles; determine a mean of the determined flow amplitudes for the first plurality of breath cycles; determine a flow amplitude for a particular breath cycle occurring subsequent to the first plurality of breath cycles; identify the particular breath cycle as a hypoventilated breath cycle if the flow amplitude for the particular breath cycle is less than the product of the determined mean flow amplitude for the first plurality of breath cycles and a first factor; and determine whether to increase the pressure of gas delivered to the patient based at least on whether the particular breath cycle is identified as a hypoventilated breath cycle.
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Specification