Breathing circuit apparatus for a nebulizer

• US 5,584,285 A
• Filed: 06/07/1995
• Issued: 12/17/1996
• Est. Priority Date: 06/07/1995
• Status: Expired due to Term

• Current Assignee: Salter Labs
• Original Assignee: Salter Labs
• Inventors: Chua, James, Salter, Peter W.
• Primary Examiner(s): Millin, V.
• Assistant Examiner(s): RACITI, ERIC
• Application Number:
  US08/485,880
• Time in Patent Office: 559 Days
• Field of Search: 128/200.11-200.23, 128/207.14, 128/202.21, 128/202.27, 128/203.12, 128/203.21, 128/203.23, 128/204.13
• US Class Current: 128/200.21
• CPC Class Codes: A61M 11/002 by flow deviation causing inertial separation of transported particles
• CPC Class Codes: A61M 11/06 of the injector type
• CPC Class Codes: A61M 15/0086 Inhalation chambers

Abstract

A breathing circuit apparatus used with a nebulizer device that generates an aerosol is adapted for use by a user for inhaling the aerosol through the user'"'"'s nose and/or mouth and thereafter exhaling exhalation gas through the breathing circuit apparatus. The breathing circuit apparatus includes a container, an inlet valve, an outlet valve and a user connection port. The container defines an interior chamber therein and is coupled to the nebulizer device. The inlet valve is connected to the container and includes an air inlet port for one-way air flow of ambient air into the interior chamber. The inlet valve moves between a closed condition to prevent the ambient air from entering into the interior chamber and an opened condition to permit the ambient air to enter into the interior chamber. The outlet valve is connected to the container and includes a gas exhalation port for one-way gas flow of the exhalation gas. The outlet valve moves between a closed state to prevent exhalation gas from exiting the interior chamber and an opened state to permit exhalation gas to exit from the interior chamber. The user connection port is in fluid communication with the interior chamber and the user'"'"'s nose and/or mouth when the user inhales and exhales. As the user inhales the aerosol from the interior chamber, the inlet valve is opened and the outlet valve is closed. As the user exhales, the inlet valve is closed and the outlet valve is opened to allow the exhalation gas to exit the interior chamber and discharge into the exterior ambient air.

Claims

1. In combination with a nebulizer device operative to generate an aerosol, a breathing circuit apparatus adapted for use by a user for inhaling the aerosol through an opening in a respiratory system of the user and into the user'"'"'s lungs and thereafter exhaling exhalation gas from the opening in the user'"'"'s respiratory system and through said breathing circuit apparatus, comprising:

(a) a container defining an interior chamber therein and coupled to said nebulizer device having an inlet orifice to provide fluid communication between said interior chamber and the nebulizer device, said interior chamber being sized and adapted to receive the aerosol generated by the nebulizer device through said inlet orifice;

(b) an inlet valve connected to said container and including an air inlet port for one-way air flow of ambient air disposed exteriorly of said container into said interior chamber, said inlet valve operative to move between a closed condition to prevent the ambient air from entering into said interior chamber and an opened condition to permit the ambient air to enter into said interior chamber;

(c) an outlet valve in communication with said container and including a gas exhalation port for one-way gas flow of the exhalation gas from the user'"'"'s respiratory system after inhalation, said outlet valve operative to move between a closed state and an opened state to permit exhalation gas to exit from said interior chamber; and

(d) a user connection port connected to said container and operative to be disposed between and in fluid communication with said interior chamber and the opening into the user'"'"'s respiratory system when the user inhales and exhales whereby, as the user inhales the aerosol from said interior chamber, said inlet valve is in the opened condition while simultaneously therewith said outlet valve is in the closed state so that the aerosol is inhaled into the lungs of the user without loss of the aerosol to the exterior ambient air and, as the user exhales the exhalation gas from the user'"'"'s respiratory system and through said user connection port, said inlet valve is in the closed condition while simultaneously therewith said outlet valve is in the opened state to allow the exhalation gas to exit the interior chamber and discharge into the exterior ambient air, and said circuit including a downdraft tube extending within said interior chamber of said container to define a downdraft duct and having a first end connected to said container and surrounding said air inlet port of said inlet valve and a free second end disposed opposite of said first end so that exterior ambient air enters through said air inlet port at said first end when said inlet valve is in the opened condition and flows through said downdraft duct to said free second end.

2. A breathing circuit apparatus according to claim 1 including a deflector member disposed within said interior chamber and interposed between said free second end of said downdraft tube and said inlet orifice, said deflector member positioned in a spaced apart relationship from said free second end of said downdraft tube and said inlet orifice.

3. A breathing circuit apparatus according to claim 2 wherein said deflector member and said inlet orifice are spaced apart from one another at a distance selected from a range between approximately 0.019 millimeters and 0.036 millimeters.

4. A breathing circuit apparatus according to claim 2 wherein said inlet orifice defines a first imaginary plane and said deflector member defines a second imaginary plane, said first and second imaginary planes being facially opposed to and parallel with one another.

5. A breathing circuit apparatus according to claim 2 including a plurality of spacers interconnecting said free second end of said downdraft tube and said deflector member and defining spacer openings between sequential ones of said spacers so that when the ambient air enters said container through said inlet valve, the ambient air passes through said downdraft duct and outwardly therefrom through said spacer openings.