The present invention discloses a catheter tip having a main longitudinal axis with a tapered distal portion having an enveloping external wall defining an inner space wherein the thickness of said wall is radially asymmetric with respect to said axis. The present invention also discloses a catheter tip having a main longitudinal axis having a tapered distal portion comprising an enveloping external wall defining an inner space wherein said tip is provided with at least one first small aperture and at least one second large aperture, said apertures are located approximately opposite each other. The present invention further discloses a catheter tip having a main longitudinal axis with a tapered distal portion having an enveloping external wall defining an inner space wherein said tip is provided with at least one first small aperture and at least one second large aperture, said apertures are located approximately opposite each other and wherein said apertures are cutouts jambs of said cutouts are tilted from the outer edge to the inner edge away from the perpendicular.
