Patent ID: 6904906

Claim:
A valve for a mouthpiece device for inspiration of a mist from a nebulizer having: an inlet connector adapted to engage the outlet port of a nebulizer; a hollow mouthpiece element for insertion into a patient's mouth, a conduit forming a direct fluid connection between the inlet connector and the hollow mouthpiece element; an exhaust outlet for removing exhalation gases which are exhaled into the mouthpiece element to outside the device, said exhaust outlet being positioned on the conduit between the inlet connector and the mouthpiece element, a positive expiratory pressure (PEP) valve being disposed to produce a back pressure in the gases exhaled through the exhaust outlet and comprising a variable resistance orifice housing, providing a variable sized exhaust opening, mounted to the mouthpiece element for variable resistance fluid communication between the interior of said hollow mouthpiece through the variable sized exhaust opening, said variable resistance to fluid flow being provided by at least one opening provided in a plate which is slideably received in contact with a fixed size opening to the inlet side of the housing, an adjuster being affixed to the plate to move the at least one opening over the fixed cross-section opening to control resistance to the fluid flow between the inlet and the exhaust openings; and a biased pressure relief valve arranged to open when the back pressure of the exhaled gases resulting from operation of the positive expiratory pressure valve exceeds a desired pressure thereby to relieve that back pressure.