Respiratory humidification system

• US 7,043,979 B2
• Filed: 01/25/2002
• Issued: 05/16/2006
• Est. Priority Date: 01/31/2001
• Status: Active Grant

• Current Assignee: Fisher & Paykel Healthcare Limited
• Original Assignee: Fisher & Paykel Healthcare Limited
• Inventors: Leonard, Peter John, Smith, Malcolm David
• Primary Examiner(s): Lefkowitz, Edward
• Assistant Examiner(s): Mack, Corey D.
• Application Number:
  US10/057,677
• Publication Number:
  US 20020100320A1
• Time in Patent Office: 1,572 Days
• Field of Search: 732/041.1, 732/041.4, 732/042.1, 732/025, 128/203.17, 128/203.15, 128/203.162, 128/200.11, 128/200.14, 600/529, 600/538
• US Class Current: 73/204.14
• CPC Class Codes: A61M 16/0066 Blowers or centrifugal pumps
• CPC Class Codes: A61M 16/0841 for sampling
• CPC Class Codes: A61M 16/1075 by influencing the temperature A61M16/1045 takes precedence
• CPC Class Codes: A61M 16/109 the humidifying liquid or the beneficial agent
• CPC Class Codes: A61M 16/1095 in the connecting tubes
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: A61M 16/161 with means for measuring the humidity
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: G01F 1/6842 with means for influencing the fluid flow

Abstract

A housing for a sensor to prevent condensate from collecting in the sensor. The housing includes a deflector to channel condensate forming in the housing away from the sensor. A notch is provided at the base of the sensor to ensure any condensate forming on the sensor itself does not collect at the sensor base. Further the interior of the housing is roughened and treated with an antifogging agent to ensure any condensate falls continuously so droplets do not form.

Claims

1. A breathing circuit apparatus for housing for a sensor, for example a sensor for providing an output signal indicative of at least one parameter of a flow of gases through said apparatus, comprising:

a housing,

an internal cavity within said housing,

a first aperture in said housing in fluid communication with said internal cavity, in use accepting said flow of gases, then flowing into said internal cavity,

a second aperture in said housing in fluid communication with said internal cavity, in use said flow of gases flowing from said internal cavity through said second aperture and said second aperture being at least partially higher than said first aperture,

a sensor mounting disposed within said housing between said first aperture and said second aperture, adapted such that in use a sensor located in said sensor mounting being at least partially within the path of said flow of gases, and

at least one condensation deflector within said internal cavity adjacent to said sensor mounting, said at least one condensation deflector adapted to in use direct any condensation that forms within said internal cavity at least partially away from a sensor which is located in said sensor mounting.

2. A breathing circuit apparatus as claimed in claim 1 wherein said parameter relates to the flow rate of said flow of gases.

3. A breathing circuit apparatus as claimed in claim 1 wherein said parameter relates to the humidity of said flow of gases.

4. A breathing circuit apparatus as claimed in claim 1 wherein said parameter relates to the temperature of said flow of gases.

5. A breathing circuit apparatus as claimed in claim 1 wherein said housing is generally elbow-shaped at an angle of 30°

.

6. A breathing circuit apparatus as claimed in claim 5 wherein said elbow-shape comprises a first passage with a first end at said first aperture and a second end intersecting with a first end of a second passage having a second end at said second aperture, said first passageway being at said angle of 30°

to said second passageway and said sensor mounting is disposed within said first passageway.

7. A breathing circuit apparatus as claimed in claim 6 wherein said condensation deflector is located adjacent to the intersection between said first passageway and said second passageway.

8. A breathing circuit apparatus as claimed in claim 7 wherein said sensor mounting includes a notch at what is in use its lowermost portion, adapted such that in use any condensation which flows to or forms on a sensor located in said sensor mounting or said sensor mounting is at least partially directed to flow through said notch and along said first passageway.

9. A breathing circuit apparatus as claimed in claim 8 wherein at least a portion of said first or second passageway including a roughened surface adapted to prevent beading and allow continuous run-off of any condensation forming within said second passageway.

10. A breathing circuit apparatus as claimed in claim 7 wherein at least a portion of said first or second passageway including a roughened surface adapted to prevent beading and allow continuous run-off of any condensation forming within said second passageway.

11. A breathing circuit apparatus as claimed in claim 10 wherein said first or second passageway also including an anti-fogging agent to further prevent beading and allow continuous run-off of any condensation forming within said second passageway.

12. A breathing circuit apparatus as claimed in claim 6 wherein said sensor mounting includes a notch at what is in use its lowermost portion, adapted such that in use any condensation which flows to or forms on a sensor located in said sensor mounting or said sensor mounting is at least partially directed to flow through said notch and along said first passageway.

13. A breathing circuit apparatus as claimed in claim 12 wherein at least a portion of said first or second passageway including a roughened surface adapted to prevent beading and allow continuous run-off of any condensation forming within said second passageway.

14. A breathing circuit apparatus as claimed in claim 6 wherein said second passageway being substantially cylindrical, and including a third aperture formed by the intersection of said first passageway, said condensation deflector comprising at least a ledge formed in the periphery of and extending into said third aperture, said ledge adapted such that in use said sensor mounting or a sensor mounted in said sensor mounting being below and thereby protected from condensation by, said ledge.

15. A breathing circuit apparatus as claimed in claim 14 wherein said first or second passageway also including an anti-fogging agent to further prevent beading and allow continuous run-off of any condensation forming within said second passageway.

16. A breathing circuit apparatus as claimed in claim 6 wherein at least a portion of said first or second passageway including a roughened surface adapted to prevent beading and allow continuous run-off of any condensation forming within said second passageway.

17. A breathing circuit apparatus as claimed in claim 16 wherein said first or second passageway also including an anti-fogging agent to further prevent beading and allow continuous run-off of any condensation forming within said second passageway.

18. A breathing circuit apparatus as claimed in any one of claims 1, 7, 12, 5, and 8, adapted to be used in conjunction with a humidifier, said humidifier adapted to humidify said flow of gases, and having an outlet and said first aperture being connected to or at least in fluid communication with said outlet, said housing adapted such that in use said first passageway thereby being substantially vertical.

19. A breathing circuit apparatus as claimed in claim 18, wherein said first or second passageway also included an anti-fogging agent to further prevent beading and allow continuous run-off of any condensation forming within said second passageway.

20. A breathing circuit apparatus as claimed in claim 1 wherein said housing is constructed using a molded plastics material.

21. A breathing circuit apparatus as claimed in claim 1 wherein said second aperture is designed to connect to a conduit to convey said flow of gases to a patient, said conduit preferably including a heating means to reduce condensation within said conduit.