Abstract: An improved drainage apparatus for use in pleural aspiration of patients during thoracic surgery. The Apparatus includes three tubes mounted in parallel and connected to one another. A first tube acts as a vacuum input tube; the second tube is a flow monitor tube, while the third tube is filled with water and keeps the vacuum system isolated from the atmosphere.

Abstract: A device for dosing vaccum, mainly for medical applications, such as tracheal suction, consists of: (a) a tube with a cylindrical section with two troncoconical ends; said tube has small outlet holes and a middle partition wall; (b) a cylindrical rubber tube; (c) a cylindrical body or container which forms a clearance with the wall of said rubber tube; (d) a valve device with a lever which allows to open the vaccum circuit; (e) a stem projecting slightly over the surface of the lid of said valve. In stand-by state the rubber tube closes the outlet holes and vaccum is excluded. Moving forward the stem communicates the inside of the body, expanding the rubber tube and allowing suction of air or intaken material. It permits a close control of the vaccum, with a complete closure in stand-by and immediate start of suction on demand. Possible contamination of operator, as well as the intake of strange materials is prevented.