Abstract: An in-line phonation valve system including a valve body having first and second ends through which gas passes into and out of the valve body. The first end is connectable to a breathing tube connected to a patient's airway, for passage of gas between the breathing tube and the valve body. The second end of the valve body is connectable to a gas line. A diaphragm-valve assembly is provided which includes a one-way valve having a phonation position permitting gas to pass through said valve body toward said patient when said patient inhales. The one-way valve in the phonation position substantially prevents gas from passing through the valve body when the patient exhales. The diaphragm-valve assembly is movable out of the phonation position, so as to permit substantially free flow of gas through the valve body both toward and away from the patient when the patient respectively inhales and exhales.

Abstract: In accordance with the present invention, a phonation valve which is cooperatively connectable to a breathing tube connected to a patient's airway, includes a valve body having first and second ends through which gas passes into and out of the valve. The first end is connectable to the breathing tube for passage of gas between the breathing tube and the valve. A valve seat is located within the valve body between the first and second ends. A thin, flexible diaphragm is provided, which is seated against the valve seat when the patient exhales. The diaphragm has a comfort-improving structural feature which can be 1) a shape which is at least partly concave on a side of the diaphragm facing the seat, and/or 2) a web of substantially uniform thickness with a plurality of discrete areas of different thicknesses dispersed around the web, which are capable of damping resonance vibration of the diaphragm during breathing by the patient.

Abstract: An in-line phonation valve system including a valve body having first and second ends through which gas passes into and out of the valve body. The first end is connectable to a breathing tube connected to a patient's airway, for passage of gas between the breathing tube and the valve body. The second end of the valve body is connectable to a gas line. A diaphragm-valve assembly is provided which includes a one-way valve having a phonation position permitting gas to pass through said valve body toward said patient when said patient inhales. The one-way valve in the phonation position substantially prevents gas from passing through the valve body when the patient exhales. The diaphragm-valve assembly is movable out of the phonation position, so as to permit substantially free flow of gas through the valve body both toward and away from the patient when the patient respectively inhales and exhales.