Trocar tube, trocar tube assembly and catheter insertion instrument

摘要

PURPOSE: To make it possible to easily and surely insert a catheter tube with low invasion by forming an aperture communicating with the internal cavity of a tubular member on the flank of this tubular member of a trocar tube consisting of the tubular member and a gripping member existing on the base end side of the tubular member. CONSTITUTION: The expansion type trocar tube 10 is composed of the tubular member 11 and the gripping member 17 connected to the operator side part 13 at the base end of the tubular member 11. The tubular member 11 is formed to an approximately conical shape smaller in the diametral bore and outside diameter of the front end 14 than the diametral bore and outside diameter of the base end 13 in a natural state. The tubular member 11 is formed to a tapered shape gradually degreasing in the outside diameter from the base end 13 toward the front end 14. Further, a slit (first aperture) 16 extending along the longitudinal direction of the tubular member 11 is formed on the flank of the tubular member 11. This slit 16 communicates with the internal cavity 12 and front end opening, respectively, of the tubular member 11. The width of the front end 14 of the slit 16 is made narrower than the width at the base end of the slit 16 in the natural state before the expansion of the tubular member 11.