Abstract: A system for occluding a blood vessel at a site of puncture of a blood vessel, especially after artery catheterization, comprises an oblong occlusive means (13) that has a shank (14) and a compression surface (15) configured thereon as the end face. The shank comprises a continuous bore (17) that extends through the compression surface to accommodate at least one guide means (11) inserted into the blood vessel and is, on the distal end (20) opposite the compression surface, adapted to be fixed on the patient on the skin when the compression surface is advanced towards the site of puncture (2).

Abstract: A cannula (10), in particular for use a retrograde cardioplegia cannula, having a balloon (12), disposed in the region of its tip (11) and inflatable by means of a fluid fed in through the cannula (10), for sealing off the space between the cannula (10) and a vessel and for positioning the cannula (10) in the vessel, wherein the balloon (12) is provided with a plurality of openings (19), through which the fluid fed in by means of the cannula (10) can emerge into the vessel.