A drainage catheter assembly (20) for the insertion of a drainage catheter percutaneously includes a trocar ( 22) , a cannula (24) , a catheter stiffener (26), and a elongated catheter (28).The trocar (22) includes a distal pointed end (34), a proximal end (30), an intermediate portion (32) having a uniform cross-sectional shape between the distal pointed end (34) and the proximal end (30), and a means (36) located at the proximal end for releasably connecting with the cannula (24).The cannula (24) may include a distal end (44), a proximal end (40), an intermediate portion (42), a cannula lumen extending therethrough, and a means (46) located at the proximal end (40) for releasably connecting with the trocar (22) and catheter stiffener (26) . The catheter stiffener (26) includes a distal end (56), a proximal end (52), an intermediate portion (54) comprising stiff material, a catheter stiffener lumen extending therethrough, and a means (58) located at the proximal end (52) for releasably connecting with the cannula (24) and catheter (28).The elongated catheter (28) includes a distal end (68) containing a tapered tip (72) , a proximal end (64) , an intermediate portion (66), a catheter lumen extending therethrough , and a means (70) for releasably connecting with the catheter stiffener (26).Un ensemble de cathéter de drainage (20) permettant dintroduire un cathéter de drainage par voir percutanée comprend un trocart (22), une canule (24), un renfort de cathéter (26) et un cathéter allongé (28). Le trocart (22) comprend une extrémité distale en pointe (34), une extrémité proximale (30), une partie intermédiaire (32) ayant une forme transversale uniforme située entre lextrémité distale en pointe (34) et lextrémité proximale (30) et un moyen (36) situé au niveau de lextrémité proximale destiné à être raccordé amovible à la canule (24). La canule (24) peut comprendre une extrémité distale (44), une extrémité proximale (40), une partie intermédiaire (42), une lumière de ca
