Abstract: A device mouthpiece is provided wherein the mouthpiece comprises a cylindrical tube and a filter element, wherein the filter element comprises a frame and a filter medium secured to the frame; the frame defines an annular channel which receives therein an end portion of the cylindrical tube; the end portion of the cylindrical tube forms a friction fit within the annular channel; and wherein the filter element is secured to the cylindrical tube via the friction fit.

Abstract: A valve housing for use in an apparatus for measuring inspiratory and expiratory lung pressure, the valve housing comprising a first body portion which defines a mouthpiece; a second body portion coupled to the first body portion and which defines a port; a filter medium disposed between the first and second body portions; a pair of spaced apart valve support bodies defined by one of the first and second body portions, wherein each valve support body defines an air flow conduit that includes a support frame disposed within the conduit, the support frame having a first side and a second side; and a pair of valves, wherein the valves are selectively secured to the respective first sides of the support frame or are secured to the respective second sides of the support frame, wherein when the valves are secured to the first sides of the support frame, they open to permit air to exit the valve housing via the air flow conduits, but close to prevent air being drawn into the valve housing from the external environme

Abstract: A device mouthpiece is provided wherein the mouthpiece comprises a cylindrical tube and a filter element, wherein the filter element comprises a frame and a filter medium secured to the frame; the frame defines an annular channel which receives therein an end portion of the cylindrical tube; the end portion of the cylindrical tube forms a friction fit within the annular channel; and wherein the filter element is secured to the cylindrical tube via the friction fit.