Gas supply for sleep apnea
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United States of America Patent
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Nov 9, 2004
Grant Date -
N/A
app pub date -
Nov 13, 2001
filing date -
May 21, 1999
priority date (Note) -
In Force
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Abstract
Controlled pressurized air is supplied to the upper anatomical airways of a patient suffering from a sleep disorder, such as apnoea. The apparatus measures the air flow and pressure to the airway, and determines whether to increase or decrease the pressure based on a determination of several factors, such is the occurrence of hypopnoea, hyperventilation, air leakage and acoustical vibrations. The method of controlling the pressure includes determining a mean amplitude of the flow of air to the patient during a predetermined number of respiratory cycles. A hypopnoea time counter is incremented when the amplitude of the flow of air during a current respiratory cycle is less than the mean amplitude of the flow of air multiplied by a hypopnoea factor. The pressure of the flow of air to the patient is increased when the hypopnoea time counter is greater than or equal to a hypopnoea time threshold.
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