Mask with anti-asphyxia valve

US7174893B2 · kind B2 · utility

Assignee

• ResMed Corp. · AU

Inventors

• Adrienne Walker · Melbourne, AU
• Geoffrey Crumblin · Parramatta, AU
• Gregory Scott Smart · Sydney, AU
• Michael Kassipillai Gunaratnam · Chatswood, AU
• Philip Rodney Kwok · Chatswood, AU
• Perry David Lithgow · Batemans Bay, AU

Key dates

• Filing date: Nov 23, 2005
• Grant date: Feb 13, 2007
• Expiry date: Nov 23, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7771
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An anti-asphyxia valve includes at least one flap having a first portion adapted for mounting to the housing and a second portion adapted to flex between a first open position allowing gas to pass from the patient side to the housing interior through the at least one port, and from the blower side through the at least one port, to atmosphere when a difference in gas pressure in the housing interior and atmosphere is below a predetermined operating threshold, and a second forcibly closed position substantially occluding the at least one port when the difference in gas pressure between the housing interior and atmosphere is substantially equal to or above the operating threshold.