Patent ID: 8550076

Claim:
A breathing circuit apparatus for use with an anesthesia mask, a gas supply and a vacuum source, comprising: said anesthesia mask including a mask body and a port projecting therefrom; a mask-to-vacuum attachment member mounted in engaging relation to said port; said mask-to-vacuum attachment member having a first port and a second port; a first tube having a first end engaging said first port of said mask-to-vacuum attachment member so that said first tube is adapted to provide fluid communication between said anesthesia mask and said gas supply; a flexible exhalation bag having an inlet and an outlet; a second tube having a first end engaging said first port of said mask-to-vacuum member, said second tube being coaxial with said first tube along a predetermined extent of said first tube and said second tube adapted to provide fluid communication between said anesthesia mask and said inlet of said exhalation bag; a one-way valve positioned between said anesthesia mask and said inlet of said exhalation bag to prevent re-breathing of exhaled gases; a gas flow-junction member having a first inlet, a second inlet, and an outlet; a third tube connected between said outlet of said exhalation bag and said first inlet of said gas flow-junction member, said third tube reducing the magnitude of the vacuum sufficiently to avoid collapse of said flexible exhalation bag by said vacuum source; a fourth tube adapted to be connected between said outlet of said gas flow-junction member and said vacuum source; a fifth flexible tube disposed in fluid communication between said second port of said mask-to-vacuum attachment member and said second inlet of said gas flow-junction member; said port of said anesthesia mask defining a common flow passage for fresh gas and exhaled gas; said mask-to-vacuum attachment member having a cylindrical structure; at least one inlet opening formed in said cylindrical mask-to-vacuum attachment member; said at least one inlet opening being in open fluid communication with ambient air so that said ambient air is drawn through said fifth tube and through said second inlet of said gas flow-junction member and into said vacuum source; said fifth tube having a restriction to flow that is greater than a restriction to flow of said third tube so that the vacuum suction in said third tube is greater than the vacuum suction in said fifth tube; and the vacuum suction in said third tube being about 60% of the suction produced by said vacuum source when said outlet of said gas flow-function member is operatively coupled to said vacuum source by said fourth tube; whereby gas that may leak from said anesthesia mask is drawn into said vacuum source so that said gas that may leak from said anesthesia mask cannot be re-breathed by the patient or other persons in the vicinity of said patient.