Portable gas powered positive pressure breathing apparatus and method
First Claim
1. A demand valve comprising:
- a gas inlet port;
a gas outlet port;
a gas powered control valve comprising a reference pressure chamber and a second chamber in uninterrupted fluid connection with the gas outlet port, wherein the control valve is responsive to a difference between a substantially constant reference pressure in the reference pressure chamber and a pressure in the gas outlet port to provide at least an inhalation mode and an exhalation mode; and
a main valve in uninterrupted fluid connection with the gas inlet port and the gas outlet port, wherein in the inhalation mode, the gas inlet port and the gas outlet port are in fluid connection through the main valve, and in the exhalation mode, the gas inlet port and the gas outlet port are substantially not in fluid connection through the main valve.
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Accused Products
Abstract
A portable positive pressure breathing apparatus includes a demand valve with a supply inlet port adapted to be connected to a pressurized source of oxygen and an outlet port adapted to be connected to the inlet of a patient'"'"'s breathing appliance. The demand valve further includes a reference chamber and a valve assembly responsive to the reference chamber/appliance inlet pressure differential for connecting/disconnecting the inlet port to and from the outlet port. At least one manually adjustable back pressure regulator is connected to the pressure source and the reference chamber for setting the pressure in the reference chamber (and inlet to the breathing appliance) at a selected level above atmospheric pressure.
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Citations
18 Claims
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1. A demand valve comprising:
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a gas inlet port; a gas outlet port; a gas powered control valve comprising a reference pressure chamber and a second chamber in uninterrupted fluid connection with the gas outlet port, wherein the control valve is responsive to a difference between a substantially constant reference pressure in the reference pressure chamber and a pressure in the gas outlet port to provide at least an inhalation mode and an exhalation mode; and a main valve in uninterrupted fluid connection with the gas inlet port and the gas outlet port, wherein in the inhalation mode, the gas inlet port and the gas outlet port are in fluid connection through the main valve, and in the exhalation mode, the gas inlet port and the gas outlet port are substantially not in fluid connection through the main valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18)
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15. A demand regulator comprising:
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a gas inlet port dimensioned and configured for fluid connection to a pressurized source of breathable gas; a gas outlet port dimensioned and configured for fluid connection to a patient breathing appliance; a demand valve comprising; a gas powered control valve assembly comprising; a diaphragm valve comprising a sensing diaphragm, a reference pressure chamber adjacent to a first surface of the sensing diaphragm, and a second chamber adjacent to a second surface of the sensing diaphragm, wherein the second chamber is in fluid connection with the gas outlet port, and a pilot valve comprising a pilot valve orifice, wherein the sensing diaphragm has at least an exhalation position and an inhalation position, in the inhalation position, a pressure in the second chamber of the control valve is lower than a pressure in the reference pressure chamber, the sensing diaphragm maintains the pilot valve in an actuated position, and the pilot valve orifice is in fluid connection with the second chamber of the diaphragm valve of the control valve, and in the exhalation position, the pilot valve is not in the actuated position; a gas powered main valve in fluid connection with the gas inlet port, wherein the main valve comprises a diaphragm valve, wherein the diaphragm valve of the main valve comprises; a diaphragm; a first chamber adjacent to a first surface of the diaphragm, and in fluid connection with the pilot valve orifice, and a second chamber adjacent to a second surface of the diaphragm, and in fluid connection with the gas outlet port, wherein the diaphragm has a first position in which the gas inlet port and the second chamber of the main valve are substantially not in fluid connection, and a second position in which the gas inlet port and the second chamber of the main valve are in fluid connection, and wherein the diaphragm is in the second position when the pilot valve is in an actuated position; and an adjustable backpressure regulator in fluid connection with the gas inlet port and the reference pressure chamber. - View Dependent Claims (16)
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Specification