A respiratory apparatus for delivering breathable gas to a patient includes a flow generator that generates a supply of pressurized gas to be delivered to the patient; a humidifier for vaporizing water and delivering water vapor to humidify the gas; a gas flow path leading from the flow generator to
A respiratory apparatus for delivering breathable gas to a patient includes a flow generator that generates a supply of pressurized gas to be delivered to the patient; a humidifier for vaporizing water and delivering water vapor to humidify the gas; a gas flow path leading from the flow generator to the humidifier and from the humidifier to a patient interface; and a heater in thermal contact with the gas and/or the water, wherein the heater includes an elongate heating filament in the form of a tape. A humidifier for respiratory apparatus includes a first respiratory gas passage for receiving gas from a flow generator, a humidifier chamber, a second respiratory gas passage for delivering humidified gas to a patient interface, and a heater in thermal contact with the gas and/or the water, wherein the heater includes an elongate heating filament extending along at least part of both said first and second respiratory gas passages. A conduit for use in a respiratory apparatus for delivering breathable gas to a patient includes a tube; a helical rib on an outer surface of the tube; and a plurality of wires supported by the helical rib in contact with the outer surface of the tube.
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1. A conduit for use in a respiratory apparatus for delivering breathable gas to a patient, the conduit comprising: a tube;a helical rib on an outer surface of the tube;at least three wires in contact with the outer surface of the tube and supported between the helical rib and the outer surface of t
1. A conduit for use in a respiratory apparatus for delivering breathable gas to a patient, the conduit comprising: a tube;a helical rib on an outer surface of the tube;at least three wires in contact with the outer surface of the tube and supported between the helical rib and the outer surface of the tube;a connector connected to an end of the conduit, the connector being configured to be connected to a flow generator or a patient interface of the respiratory apparatus; anda printed circuit board supported on the connector and connected to the at least three wires, the printed circuit board comprising a thermal fuse and a temperature sensor, wherein one of the at least three wires is connected to the temperature sensor to provide a signal to a power supply and controller of the respiratory apparatus and two of the at least three wires form a heating circuit. 2. A conduit according to claim 1, wherein the tube is formed of thermoplastic elastomer. 3. A conduit according to claim 1, wherein the helical rib is formed of low density polyethylene. 4. A conduit according to claim 1, wherein the at least three wires are copper. 5. A conduit according to claim 1, wherein the connector is connected to the conduit by a cuff. 6. A conduit according to claim 5, wherein the cuff is overmolded to the conduit and the connector. 7. A conduit according to claim 5, wherein the cuff covers the printed circuit board. 8. A conduit according to claim 5, wherein the cuff comprises grip features formed in and/or on an outer surface. 9. A conduit according to claim 5, wherein the cuff comprises strain relief features formed in and/or on an outer surface. 10. A conduit according to claim 1, wherein the connector is configured to be connected to the flow generator and the conduit further comprises a terminal clip configured to be connected to an electrical connector. 11. A conduit according to claim 10, wherein the terminal clip contacts the at least three wires so that power may be delivered to the conduit by the electrical connector. 12. A conduit according to claim 10, wherein the terminal clip is attached to the connector and secured to the connector by a cuff. 13. A conduit according to claim 10, wherein the terminal clip comprises at least three terminals corresponding to the at least three wires. 14. A conduit according to claim 1, wherein the connector is configured to be connected to the patient interface. 15. A conduit according to claim 14, wherein the connector is configured to connect to an elbow of the patient interface. 16. A conduit according to claim 1, wherein at least one of the at least three wires is connected to the thermal fuse. 17. A conduit according to claim 1, wherein the thermal fuse is configured to break the heating circuit if a temperature of the conduit exceeds a predetermined temperature. 18. A conduit according to claim 1, wherein the connector comprises a window structured to expose at least part of the printed circuit board to a flow of gas in the conduit. 19. A conduit according to claim 1, wherein the temperature sensor is a thermistor. 20. A respiratory apparatus for delivering breathable gas to a patient, comprising: a flow generator to generate a supply of pressurised gas to be delivered to the patient;a humidifier to vaporize water and to deliver water vapor to humidify the breathable gas;a first gas flow path leading from the flow generator to the humidifier; anda second gas flow path leading from the humidifier to a patient interface, wherein the first gas flow path and/or the second gas flow path comprises a conduit according to claim 1. 21. A respiratory apparatus according to claim 20, further comprising a power supply and controller configured to supply and control power to the conduit through an electrical connector. 22. A respiratory apparatus according to claim 21, wherein the power supply and controller comprises an AC power input connected to a switch mode power supply and a bypass AC power lead connected to the switch mode power supply, and the flow generator is connectable to the power supply and controller by the bypass AC power lead. 23. A respiratory apparatus according to claim 22, wherein the power supply and controller further comprises a control unit configured to produce a DC power output from the switch mode power supply at a selected duty cycle, wherein the DC power output is connected to the conduit by the electrical connector. 24. A respiratory apparatus according to claim 23, wherein the power supply and controller further comprises a switch configured to switch the DC power output on and off at a selected duty cycle. 25. A respiratory apparatus according to claim 24, wherein the control unit is a closed loop temperature control system and is configured to receive a signal from a temperature sensor on the conduit during the OFF cycle of the duty cycle and control the DC power output to maintain a preset temperature in the conduit during the ON cycle of the duty cycle. 26. A respiratory apparatus according to claim 23, wherein the control unit is configured to record temperature when the power supply and controller is turned off. 27. A respiratory apparatus according to claim 23, wherein the power supply and controller comprises a plurality of LEDs. 28. A respiratory apparatus according to claim 27, wherein a first LED is configured to indicate that the DC power output is on and that DC Power is being provided to the first gas flow path conduit, a second LED is configured to indicate that the DC power output is on but that DC Power is not provided to the first gas flow path conduit, and a third LED is configured to indicate a fault. 29. A respiratory apparatus according to claim 28, wherein the fault comprises a) a discontinuity in any of the at least three wires of the first gas flow path conduit and the at least three wires of the second gas flow path conduit and/or b) arcing and/or a bad connection between the first gas flow path conduit and the flow generator and/or between the second gas flow path conduit and the patient interface and/or c) low voltage. 30. A method of delivering breathable gas to a patient, comprising: delivering a humidified flow of breathable gas to a patient interface via a conduit according to claim 1;heating the conduit by supplying a DC current at a predetermined duty cycle to a plurality of wires supported by the conduit;sensing a temperature in the conduit during an OFF cycle of the predetermined duty cycle; andcontrolling the DC current to maintain the temperature in the conduit at a selected temperature.
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이 특허에 인용된 특허 (30)
Carlson Lennart L. (Irvine CA), Apparatus and method for making flexible tubing with helically wound heating conductor.
Rusz Tibor (Albuquerque NM) Jacobson Elliott (Pasadena CA) Bryan Jon R. (Albuquerque NM), Hot wire anemometer adapted for insertion in a calibration socket of a pulmonary gas flow monitor.
Elsworth Adrian J. (Auckland NZX) Daniell Michael G. (Auckland NZX) Zwaan Paul (Auckland NZX) Stewart David P. M. (Auckland NZX), Methods of and/or apparatus for humidifying gases.
Clawson Burrell E. (2425 Sunset Dr. Riverside CA 92506) Weigl James (18815 Hermosa St. Riverside CA 92506), Tubing circuit systems for humidified respiratory gas.
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