Catheter assembly (10) comprising: a catheter (12) defining at least one lumen (14) extending longitudinally and a stylet (30) including a core wire and defining a distal segment (32) preformed with respect to a longitudinal axis of a portion proximal to distal segment stylet (30) (32) deviates, in which the distal segment (32) preformed includes a distal portion of the core wire has a diameter (D2) which is reduced with respect to a diameter (D1) of the proximal part of the core wire, and wherein the distal segment ( 32) formed previously stylet (30) causes a distal segment of the catheter (12) to deflect relative to the longitudinal axis when the stylet (30) received within the at least one light and a sheath (42) of tube, wherein the sheath (42) of tube: slides over the central wire stylet reduced diameter along the distal segment (32) is dimensioned to substantially match the diameter (D1) of a proximal portion of the core wire stylet is attached to the core wire near a transition region (40) and the distal end (30B) of the core wire by adhesive (46) and wherein, set in this way, an air chamber (48) between an outer surface of the corewire and an inner surface of the sheath (42) tube is created.Conjunto de catéter (10), que comprende: un catéter (12) que define al menos una luz (14) que se extiende longitudinalmente y un estilete (30) que incluye un hilo central y que define un segmento distal (32) conformado previamente que se desvía con respecto a un eje longitudinal de una parte del estilete (30) proximal al segmento distal (32), en el que el segmento distal (32) conformado previamente incluye una parte distal del hilo central que tiene un diámetro (D2) que está reducido con respecto a un diámetro (D1) de la parte más proximal del hilo central, y en el que el segmento distal (32) conformado previamente del estilete (30) provoca que un segmento distal del catéter (12) se desvíe con respecto al eje longitudinal cuando el estilete (30) se recibe dentro de la al
