Ventilation apparatus for pulmonary scintigraphy

Ventilation apparatus for pulmonary scintigraphy comprising:

• a source of marked aerosol;
• an element of inhalation, through nose or mouth that is adapted to administer to a patient said marked aerosol;
• a feed duct that is connected to said source of marked aerosol in order to define an inlet flow of marked aerosol towards said element of inhalation;
• an outlet duct in order to define an outlet flow of exhaled/surplus aerosol from said element of inhalation;
• an inhalation collector where said feed duct, said outlet duct and said element of inhalation converge, wherein said element of inhalation is connected directly to said inhalation collector
• a one-way interposition element in said inhalation collector that is movable between a first position, where it allows said inlet flow of marked aerosol when breathing in from said element of inhalation, and a second position, where it stops or limits the flow into said inhalation collector of the marked outlet aerosol when breathing out from said element of inhalation towards said outlet duct,
• wherein said one-way interposition element is a flap valve, and
• wherein said feed duct has a predetermined length set between 20 cm and 40 cm that is adapted to retain particles of marked aerosol that are larger than 1.5 μm and to let particles of marked aerosol that have a size set between 1.0 μm and 1.5 μm to pass through said feed duct and to reach said element of inhalation during a breathing in step.