Device for displaying and measuring air losses in a chest drainage apparatus

A device for displaying and measuring air losses in a chest drainage apparatus, said apparatus being provided with an enclosure with transparent windows which comprises a union for connection to an end of a tube which is designed to be connected, at the other end, to the chest cavity of a patient to convey exuded liquids and air losses, and further comprising a vessel for collecting said liquids, comprising, within said apparatus at one of said transparent windows, a chamber which contains liquid on the bottom and comprises an outlet section of a duct for conveying said air losses, further comprising a bell which is arranged above said outlet section, is immersed in said liquid at least at a lower end area and is provided, at a submerged portion, with at least one always-open port for the outflow of air which is not comprised within the portion of the surface of said bell which lies directly above said outlet section, and with at least one additional port for the outflow of air, which is provided with opening and closure means, said ports for the outflow of the air from the bell being connected to the upper portion of said liquid containment chamber, which is connected to an evacuation union.