Needle and assembly of needle, guidewire, and/or catheter insert

A medical assembly comprising:

• a needle including a hub, an elongate body, and a lumen, wherein the elongate body has a proximal portion joined to the hub and defining a proximal end of the elongate body, a distal portion opposite the proximal portion and defining a distal end of the elongate body, and an intermediate portion between the proximal portion and the distal portion and having a first end adjacent the proximal portion and a second end adjacent the distal portion, wherein the lumen extends longitudinally through the elongate body, and wherein the proximal portion extends linearly along a longitudinal axis and has a proximal diameter, the distal portion is curved to space the distal end away from the longitudinal axis and has a distal diameter that is less than the proximal diameter, and the intermediate portion tapers in diameter going from the first end to the second end, wherein the elongate body comprises an outer shaft that extends between the proximal end of the elongate body and the first end of the intermediate portion, and an inner shaft received in the outer shaft and defining the lumen, the inner shaft extending between the proximal end of the elongate body and the distal end of the elongate body;
• and
• a guidewire advanceable through the lumen from the proximal end to the distal end of the elongate body.