Method and apparatus for providing percussive ventilation therapy to a patient airway
Method and apparatus for providing percussive ventilation therapy to a patient airway preferably includes at least one driver unit configured to provide pressurized, non-pulsate gas. At least one patient interface device preferably has structure configured to (i) receive the pressurized, non-pulsate gas from the at least one driver unit and transform it into a pulsed and pressurized gas, and (ii) supply at least one sub tidal volume of pulsed and pressurized gas to a patient through a patient connection orifice. At least one flexible tube is preferably configured to provide pressurized, non-pulsate gas from the at least one driver unit to the at least one patient interface device. Preferably, at least one portion of the patient interface device is disposable, and another portion may be reusable. Preferably, the invention uses Adaptive Dynamic Subtidal Ventilation technology.
1 . A patient interface device for delivering percussive gas to a patient, comprising:
an inspiration module having at least one inlet port to receive pressurized gas and an outlet port to deliver the pressurized gas to the patient during inspiratory phase, wherein the inspiration module comprises a hollow inner body and a sliding Venturi valve slidably connected to the inner body, wherein the Venturi valve is configured to slide relative to the inner body; and
an expiration module comprising a hollow outer body that partially encloses the inner body of the inspiration module and completely encloses the sliding Venturi valve, wherein the expiration module is configured to vent exhalation gas from the patient during expiratory phase and wherein the exhalation module includes a patient connection orifice to deliver the pressurized gas to the patient and to receive the exhalation gas from the patient.
2 . The patient interface device of claim 1 wherein an exhalation channel is formed in the outer body to vent the exhalation gas from the patient during the expiratory phase.
3 . The patient interface device of claim 1 wherein the inspiration module comprises a high pressure flow unit that is disposed inside the inner body and comprises:
a tube for receiving the pressurized gas;
a servo diaphragm coupled to an end of the tube; and
a jet connected to the servo diaphragm and to the sliding Venturi valve.
4 . The patient interface device of claim 3 wherein the sliding Venturi valve is configured to slide in a direction while pulling the jet and the servo diaphragm to open the tube during the inspiratory phase and is configured to slide in an opposite direction while pressing the jet and the servo diaphragm to close the tube during the expiratory phase.
5 . The patient interface device of claim 4 wherein the high pressure flow unit is configured such that the pressurized gas received through the inlet port flows through the tube, the jet and the sliding Venturi valve when the diaphragm is pulled.
6 . The patient interface device of claim 3 wherein the inspiration module is configured to include a bias flow channel formed between the high pressure flow unit and a wall of the hollow inner body, and wherein the bias flow channel is configured to provide a bias gas flow to the sliding Venturi valve.
7 . The patient interface device of claim 6 wherein the bias gas flow is a flow of humidified gas and the pressurized gas supplied to the tube is pressured pulsatile dry gas.
8 . The patient interface device of claim 1 wherein an exhalation channel is formed between a wall of the hollow outer body and the inner body, and is configured to vent the exhalation gas from the patient therethrough during the expiratory phase.
9 . The patient interface device of claim 8 wherein the sliding Venturi valve is configured to be at a first position to close the exhalation channel during the inspiratory phase and to be at a second position to open the exhalation channel during the expiratory phase.
10 . A ventilation system for delivering percussive gas to a patient, comprising:
a ventilator that is configured to supply pressurized gas;
a patient interface device for delivering percussive gas to the patient, comprising:
an inspiration module having at least one inlet port to receive pressurized gas and an outlet port to deliver the pressurized gas to the patient during inspiratory phase, wherein the inspiration module comprises a hollow inner body and a sliding Venturi valve slidably connected to the inner body, wherein the Venturi valve is configured to slide relative to the inner body; and
an expiration module comprising a hollow outer body that partially encloses the inner body of the inspiration module and completely encloses the sliding Venturi valve, wherein the expiration module is configured to vent exhalation gas from the patient during expiratory phase and wherein the exhalation module includes a patient connection orifice to deliver the pressurized gas to the patient and to receive the exhalation gas from the patient; and
a tubing system including at least one flexible tube connecting the ventilator to the patient interface device.
11 . The ventilation system of claim 10 wherein an exhalation channel is formed in the outer body to vent the exhalation gas from the patient during the expiratory phase.
12 . The ventilation system of claim 10 wherein the inspiration module comprises a high pressure flow unit that is disposed inside the inner body and comprises:
a tube for receiving the pressurized gas;
a servo diaphragm coupled to an end of the tube; and
a jet connected to the servo diaphragm and to the sliding Venturi valve.
13 . The ventilation system of claim 12 wherein the sliding Venturi valve is configured to slide in a direction while pulling the jet and the servo diaphragm to open the tube during the inspiratory phase and is configured to slide in an opposite direction while pressing the jet and the servo diaphragm to close the tube during the expiratory phase.
14 . The ventilation system of claim 13 wherein the high pressure flow unit is configured such that the pressurized gas received through the inlet port flows through the tube, the jet and the sliding Venturi valve when the diaphragm is pulled.
15 . The ventilation system of claim 12 wherein the inspiration module is configured to include a bias flow channel formed between the high pressure flow unit and a wall of the hollow inner body, and wherein the bias flow channel is configured to provide a bias gas flow to the sliding Venturi valve.
16 . The ventilation system of claim 15 wherein the bias gas flow is a flow of humidified gas and the pressurized gas supplied to the tube is pressured pulsatile dry gas.
17 . The ventilation system of claim 15 wherein the tubing system includes at least one channel to deliver the bias gas flow to the inspiration module.
18 . The ventilation system of claim 10 wherein an exhalation channel is formed between a wall of the hollow outer body and the inner body, and is configured to vent the exhalation gas from the patient therethrough during the expiratory phase.
19 . The ventilation system of claim 18 wherein the sliding Venturi valve is configured to be at a first position to close the exhalation channel during the inspiratory phase and to be at a second position to open the exhalation channel during the expiratory phase.