INTERVENTIONAL MEDICAL SYSTEM WITH A DELIVERY CATHETER COMPRISING A COILED SPRING MEMBER WITH] OPEN-PITCH TURNS

摘要

A catheter (300) is disclosed for delivering a medical device (30) to an implant site from a receptacle of a distal-most portion (110) of the catheter. The catheter includes a coiled spring member (21) which has one or more proximal turns secured to a shaft proximal portion (310), one or more distal turns secured to the distal-most portion and a plurality of open-pitch turns extending between the proximal and distal turns, the open-pitch turns preferably pre-loaded by longitudinal compression. A deflection assembly pull wire (315) extends through a shaft proximal portion lumen and alongside the plurality of open-pitch turns of the spring member, wherein a pull wire proximal end extends proximally out from a proximal opening of the lumen and into a catheter handle (320) for coupling to a control member subassembly and a pull wire distal end (315-d) is secured to the shaft distal-most portion.