Patent ID: 6394091
Filing Date: 2002-05-28
Classification: A62B

Abstract:
A breathing apparatus for supplying air at positive pressure responsive to a user's breathing efforts, comprising:a mask; a body, the body including a sensing chamber and a positive pressure chamber therein, the sensing chamber in fluid communication with the mask; a first movable member bounding the sensing chamber, wherein the first member moves in response to pressure in the mask; an air delivery valve in operative connection with the first member, the delivery valve having an outlet, wherein air is delivered to the outlet responsive to movement of the first member to an air delivery position, and wherein the outlet is in fluid communication with both the mask and the positive pressure chamber; a check valve in intermediate fluid relation between the valve outlet and the positive pressure chamber, wherein the check valve enables flow only from the outlet to the positive pressure chamber; and a second movable member bounding said positive pressure chamber, wherein the second member moves in a first direction responsive to delivery of air to the positive pressure chamber, and wherein the second member is in operative connection with the first member, wherein movement of said second member in the first direction is operative to bias the first member towards the air delivery position.