METHOD AND APPARATUS FOR RESPIRATORY THERAPY
First Claim
Patent Images
1. A method for delivering pressurized gas to an airway of a subject comprising:
- applying a constant pressure at a level less than an effective pressure at or approximately at the beginning of exhalation until the nadir or approximately the nadir of exhalation;
raising the applied pressure to an effective pressure at a rate beginning at or approximately at the nadir of exhalation until the beginning or until approximately the beginning of inhalation; and
applying effective pressure during inhalation.
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Abstract
The disclosure provides a method for delivering pressurized gas to an airway of a subject. The disclosure also provides a system for delivering pressurized gas to an airway of a subject. The disclosure further provides a computer-readable storage medium containing a set of instructions executable on a processor that include routines to monitor a respiratory flow rate from a subject, generate a filtered flow and a dynamic flow from the respiratory flow rate, and control a gas generator connected to a breathing device.
260 Citations
20 Claims
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1. A method for delivering pressurized gas to an airway of a subject comprising:
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applying a constant pressure at a level less than an effective pressure at or approximately at the beginning of exhalation until the nadir or approximately the nadir of exhalation; raising the applied pressure to an effective pressure at a rate beginning at or approximately at the nadir of exhalation until the beginning or until approximately the beginning of inhalation; and applying effective pressure during inhalation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for delivering pressurized gas to an airway of a subject comprising:
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a gas source; a flow sensor to monitor a respiratory flow rate; a filter operable to generate at least one of a filtered flow and a dynamic flow from the respiratory flow rate; a pressure controller connected to the breathing device operable to control pressure levels applied from the gas source; and an event detector connected to the pressure controller, the event detector operable to; detect the beginning of exhalation in the subject; provide a signal to the pressure controller to apply a pressure at a level less than an effective pressure; detect the nadir of exhalation in the subject; provide a signal to the pressure controller to raise the applied pressure to an effective pressure; detect the beginning of inhalation; and provide a signal to the pressure controller to apply pressure at an effective pressure. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A computer-readable storage medium containing a set of instructions executable on a processor, the set of instructions comprising:
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a routine operable to continuously monitor a respiratory flow rate from a subject; and a routine operable to control a breathing gas generator operable to apply a constant pressure at a predetermined level less than an effective pressure at the beginning or at approximately the beginning of exhalation until the nadir or until approximately the nadir of exhalation, raise the applied pressure to the effective pressure beginning at the nadir or at approximately the nadir of exhalation until the beginning or until approximately the beginning of inhalation, and apply the effective pressure during inhalation. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system for delivering pressurized gas to an airway of a subject, said system comprising:
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a gas generating means operable to deliver pressurized gas to the subject; a flow sensing means operable to monitor a respiratory flow; a filter means operable to generate at least one of a filtered flow and a dynamic flow from the respiratory flow rate; a pressure controller means connected to the gas generating means operable to control pressure levels supplied by the gas generating means; and an event detection means connected to the pressure controller means, wherein the event detection means is operable to; detect the beginning or approximately the beginning of exhalation in the subject; provide a signal to the pressure controller means to direct the gas generating means to supply a constant pressure at a level less than an effective pressure at the beginning of or at approximately the beginning of exhalation of the subject; detect the approximate nadir or nadir of exhalation in the subject; provide a signal to the pressure controller means to direct the gas generating means to raise the supplied pressure to an effective pressure at a predetermined rate upon detection of the approximate nadir or nadir of exhalation in the subject; detect the beginning or approximate beginning of inhalation; and provide a signal to the pressure controller means to direct the gas generating means to supply an effective pressure at the beginning or approximate beginning of exhalation.
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20. A system for delivering pressurized gas to an airway of a subject, said system comprising:
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a gas generating means operable to deliver pressurized gas to the subject; a flow sensing means operable to monitor a respiratory flow; a filter means operable to generate at least one of a filtered flow and a dynamic flow from the respiratory flow rate; a pressure controller means connected to the gas generating means operable to control pressure levels supplied by the gas generating means; and an event detection means connected to the pressure controller means, wherein the event detection means is operable to; detect the beginning or approximately the beginning of exhalation in the subject; provide a signal to the pressure controller means to direct the gas generating means to supply a constant pressure at a level less than an effective pressure at the beginning of or at approximately the beginning of exhalation of the subject; detect the approximate nadir or nadir of exhalation in the subject; provide a signal to the pressure controller means to direct the gas generating means to raise the supplied pressure to an effective pressure at a rate upon detection of the approximate nadir or nadir of exhalation in the subject, wherein the rate is proportional to the respiratory flow rate from the subject; detect the beginning or approximate beginning of inhalation; and provide a signal to the pressure controller means to direct the gas generating means to supply an effective pressure at the beginning or approximate beginning of exhalation.
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Specification