The present disclosure relates to a catheter for insertion into a vessel of a patient, the catheter including an elongate body extending between a proximal end for attachment to a hub and a distal end at a tip portion thereof, the body having a circumferential wall and including a first portion that extends a first length from the proximal end and defines an enclosed section of the wall and a second portion that extends a second length from an end of the first portion towards the tip portion, the second portion defining an at least partially open section of the wall having a plurality of openings arranged to permit fluid flow into and out of the second portion of the body.
