Patent ID: 9649460
Date: 2017-05-16
CPC Classifications: A61M

Claim:
1. A breathing apparatus comprising: an exhalation chamber comprising a first biasing member dividing said chamber into first and second variable chambers, wherein said first variable chamber comprises an inlet port adapted for fluid communication with a user interface and an outlet port separate from said inlet port and in fluid communication with the ambient environment, wherein said second variable chamber comprises an inlet port and an outlet port; an inhalation chamber comprising an inlet port in fluid communication with said outlet port of said second variable chamber, an outlet port in fluid communication with said user interface, and a second biasing member; and a one-way valve providing one-way fluid communication from said outlet port of said second variable chamber to said inlet port of said inhalation chamber; wherein said first biasing member is moveable from a first position to a second position in response to an exhaust flow from said inlet port of said first variable chamber, and wherein a volume of said first variable chamber is increased from a first volume to a second volume and a volume of said second variable chamber is decreased from a first volume to a second volume in response to said movement of said first biasing member; wherein said second biasing member is moveable from a first position to a second position in response to a pressurized flow from said outlet port of said second variable chamber to said inlet port of said inhalation chamber, and wherein a volume of said inhalation chamber is increased from a first volume to a second volume in response to said movement of said second biasing member.