Humidifier

• US 4,588,425 A
• Filed: 03/26/1985
• Issued: 05/13/1986
• Est. Priority Date: 11/08/1983
• Status: Expired due to Term

• Current Assignee: Bunnell Life Systems Incorporated
• Original Assignee: Bunnell Life Systems Incorporated
• Inventors: Atkins, Roger, Usry, Joe, Faddis, Chris
• Primary Examiner(s): Hart, Charles
• Application Number:
  US06/716,199
• Time in Patent Office: 413 Days
• Field of Search: 55/227, 55/248, 55/249, 55/256, 55/257 QN, 55/95, 55/257 PV, 55/267, 128/200.21, 128/203.27, 219/272, 219/273, 239/338, 239/398, 239/433, 261/121 R, 261/142, 261/DIG. 54
• US Class Current: 96/245
• CPC Class Codes: A61M 16/0096 High frequency jet ventilation
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: A61M 16/162 Water-reservoir filling system, e.g. automatic
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: Y10S 261/54 Venturi scrubbers

Abstract

A humidifier for pulmonary assistance systems which includes a transparent housing with an air passage extending therethrough and water reservoir. The passage includes a convergent-divergent section separated by a narrow throat. A narrow channel connecting the reservoir to the throat so that with the divergent section being open to the reservoir, the differential pressure between the reservoir and the throat causes water to flow into the air passage. A collection surface is provided in the divergent section for extracting water droplets from the air flowing through the passage, and a heating panel is provided for heating the water in the reservoir.

Claims

1. A humidifier which includes

a housing having an air passage defined therein, said air passage including

a venturi section comprising a convergent segment, a narrow throat, and a divergent segment, and

a scrubber area for receiving air and water vapor from the divergent segment,

a water reservoir defined in the housing at a location below the scrubber area to receive water droplets therefrom, and such that the venturi section is below the water level in the reservoir,

a narrow channel connecting the reservoir with the throat of the venturi section to carry water to the venturi section to thereby vaporize at least a portion of the water,

means for heating water in the water reservoir, and

wherein the housing includes two plates of transparent plastic positioned in a side-by-side relationship, with the air passage and reservoir being defined in facing surfaces of the plates.

2. A humidifier as defined in claim 1 further including a series of vanes extending generally parallel to one another across a substantial portion of the scrubber area and wherein the divergent segment discharges against an inner surface of the housing.

3. A humidifier as defined in claim 1 wherein the heating means includes

a metal cup fitted into one of the plates to define a side wall of the reservoir.

4. A humidifier as defined in claim 1 wherein the gas volume within the housing is between about 0.5 and 1.5 cubic inches.

5. A humidifier as defined in claim 4 further including means for sensing the level of water in the reservoir.

6. A humidifier as defined in claim 1 further including means for sensing the temperature of the humidified air in the air passage.

7. A humidifier as in claim 2 wherein said vanes are formed to extend downwardly from near the top of the housing into the scrubber area alternately from opposite sides of the scrubber area to define a sinuous path of travel for the air flow.

8. A humidifier as in claim 7 wherein said vanes are formed to extend downwardly at an acute angle from the vertical in the direction of air flow.

9. A humidifier as in claim 8 wherein the angle of the vanes from the vertical is about 30 degrees.

10. A humidifier which includes

a housing having an air passage defined therein, said air passage including an enlarged scrubber area into which air is directed,

venturi air inlet means for conveying air into the air passage,

a water reservoir defined in the housing below the scrubber area and in communication with the venturi air inlet means,

a series of vanes extending downwardly into the scrubber area at an acute angle from the vertical in the direction of air flow,

means for heating water in the reservoir,

means for drawing water from the reservoir and discharging the water into the air passage after the water has passes through the venturi air inlet means to thereby vaporize at least a portion of the water, and

outlet means for conveying air and water vapor from the scrubber area.

11. A humidifier as in claim 10 wherein the vanes are formed to extend into the scrubber area alternately from opposite sides thereof to define a sinuous path of travel for the air flow.

12. A humidifier as in claim 11 wherein the air passage includes a venturi section, and wherein the means for drawing water includes a narrow channel extending between the reservoir and the venturi section.