TROCAR CATHETER FOR DRAINAGE

摘要

A trocar catheter (110) includes a trocar rod (121) having a stepped diameter distal end for use with a catheter having a stepped diameter lumen wherein the trocar (120) is inserted into the lumen (113) of the catheter and the trocar is used to incise a patient and install the catheter after which the trocar is removed from the lumen of the catheter. The distal end (130) of the trocar rod (121) is provided with a stepped coaxial bore (132) into which a piercing point rod, a spring (140) and a safety sleeve (144) are assembled. The piercing point rod (122) has a proximal small diameter portion (138) which is press fit into a correspondingly small diameter portion of the coaxial bore (132) in the distal end of the trocar rod (121). The spring (140) is carried on the small diameter portion of the piercing point rod (122) and biases the safety sleeve (144) in a distal direction. The distal end of the piercing point rod has a larger diameter portion (123) tapering to a piercing tip (125) and the safety sleeve has a stepped inner diameter which prevents it from moving beyond a predetermined distal position covering the piercing tip (125). The stepped coaxial bore (136) has a large diameter portion for receiving the safety sleeve when it is pressed proximally against the spring. A protrusion (150) on the distal outer surface of the safety sleeve (144) prevents the catheter (110) from accidentally slipping off the trocar (120).