Respiratory humidification system
A respiratory humidification system having a capillary passage in communication with a ventilator, the ventilator adapted to deliver an air stream, a heater operable to at least partially vaporize water in the capillary passage, a pumping unit adapted to supply water to the capillary passage, wherein the water upon heating is at least partially vaporized to form an aerosol stream. The aerosol stream is combined with the air stream to form a humidified air stream.
1. A method of delivering a humidified air stream comprising:
supplying water to a capillary passage, wherein the water is supplied to the capillary passage at a pressure of approximately 10 to 80 psig and at a flow rate of approximately 0.25 cc/minute to 2.2 cc/minute;
vaporizing at least a portion of the water within the capillary passage to form an aerosol stream;
supplying an air stream from a ventilator;
combining the aerosol stream and the air stream to form a humidified gas stream; and
discharging the humidified air stream.
2. The method of claim 1 , wherein the aerosol stream includes aerosol particles having a particle size of less than 2 microns.
3. The method of claim 1 , further comprising adjusting at least one of the water supplying step and the vaporizing step responsively to a change in said air supplying step.
4. The method of claim 1 , wherein said vaporizing at least a portion of the water comprises a continuous communication of heat to the capillary passage and said supply water is continuous and includes recirculating an excess flow of water.
5. The method of claim 1 , wherein said supplying water comprises pumping water, said method further comprising controlling relative humidity by adjusting said pumping.
6. The method of claim 5 , wherein said supplying water further comprises filtering the water at a location upstream of said capillary passage.
7. The method of claim 1 , wherein a heater at least partially vaporizes water in the capillary passage, a pumping unit supplies water to the capillary passage, a controller continuously operates the pump to maintain the capillary in a heater condition and a water recirculation arrangement accommodates continuous operation of the pumping unit.
8. The method of claim 7 , wherein the pumping unit delivers the water to the capillary passage at a pressure of approximately 10 to 80 psig.
9. The method of claim 7 , wherein a filter demineralizes water supplied from the pressurized water supply.
10. The method of claim 7 , wherein the aerosol stream from the capillary passage is directed in a coaxial relation with respect to the air stream from the ventilator.
11. The method of claim 7 , wherein a flow tube having an inlet end is in fluid communication with an outlet of the capillary passage and an outlet adapted for connection to a patient interface device.
12. The method of claim 1 , wherein the capillary passage is a coated capillary passage whose operating temperature is in the range of 120 to 130 degrees Celsius.
13. The method of claim 12 , wherein the coated capillary passage is coated with a fluorine-containing polymer.