Medical-surgical drain cannula has orifices in distal end located in spiral grooves to prevent blockages

摘要

The drain cannula (1) has an axial channel (2) linked to an aperture in its distal end (3) and a series of peripheral apertures (4) round the conical tip (7). The peripheral apertures are located in the base of spiral grooves (6). The proximal end of the cannula has a connector (5) for a suction tube. Preferred Features: The peripheral apertures are located in the base of spiral grooves (6) lying at 20-40 deg to the cannula's axis. The distal end of the cannula can be made from a material with a shape memory effect for use with a stilette-mandrel.