Valve for use in a gas delivery system

• US 5,896,857 A
• Filed: 12/20/1996
• Issued: 04/27/1999
• Est. Priority Date: 12/20/1996
• Status: Expired due to Term

• Current Assignee: Resmed Limited (ResMed Incorporated)
• Original Assignee: Resmed Limited (ResMed Incorporated)
• Inventors: Lithgow, Perry David, Hely, Kenneth Frederick
• Primary Examiner(s): Lewis, Aaron J.
• Application Number:
  US08/772,285
• Time in Patent Office: 858 Days
• Field of Search: 128/203.11, 128/205.24
• US Class Current: 128/205.24
• CPC Class Codes: A61M 16/06 Respiratory or anaesthetic masks
• CPC Class Codes: A61M 16/208 Non-controlled one-way valves, e.g. exhalation, check, pop-off non-rebreathing valves
• CPC Class Codes: A62B 7/12 with fresh-air hose
• CPC Class Codes: A62B 9/02 Valves non-return valves mounted in breathing masks or helmets A62B18/10

Abstract

A safety valve for use in closed systems wherein there is a flow generator delivering oxygen or some other type of breathing gas to a patient. The safety valve of the present invention vents to the open atmosphere in the event that the breathing gas generated by the flow generator diminishes or terminates.

Claims

1. A breathing safety valve having a first end and a second end, said first end secured to a flexible tubing which in turn is secured to a means to deliver a breathing gas, said second end secured to a breathing mask which is secured to a patient, said components defining a system which in a first operational mode the system is a substantially closed system, said system defined by the means to deliver a breathing gas secured to a flexible tubing which is secured to said safety valve which is secured to said mask, said safety valve comprising:

(a) an outer housing, said outer housing having a gas delivery housing end and a mask housing end, said gas delivery housing end having a first shoulder, said mask housing end having a second shoulder, said second shoulder having a port therethrough for the purpose of venting the closed system to the atmosphere in a second operational mode;

(b) a slider element, said slider element being configured to fit within said housing, said slider element having a third shoulder comprising an aperture therethrough, and a fourth shoulder, said slider element having at least two positions engageable within said housing, a first position wherein said fourth shoulder of said slider element substantially engages said second shoulder of said mask housing end such that said port is substantially blocked, thereby resulting in said first operational mode, a second position wherein said third shoulder of said slider element substantially engages said first shoulder of said gas housing end thereby resulting in said second operational mode; and

(c) a force means applying a returning force to said slider element, said force biasing said slider element from said first position to said second position.

2. The valve of claim 1 wherein there are a plurality of ports and a plurality of apertures.

3. The valve of claim 1 wherein said returning force comprises a first magnet on said slider element and a second magnet on said gas delivery housing, said magnets positioned such that the returning force does not exceed the force applied to said slider element when the pressure present in said first operational mode is above about one to three centimeters of water above atmospheric pressure.

4. The valve of claim 1 wherein said second position results from said means to deliver a breathing gas not generating said gas in sufficient volume to maintain at least one centimeter of pressure in said closed system.

5. The valve of claim 1 wherein said valve is integral with said mask.

6. The valve of claim 1 wherein said valve is integral with said means to deliver a breathing gas.