Patent ID: 8366720

Claim:
A tubular member of a system for delivering an interventional medical device within a body vessel, the tubular member comprising: a proximal portion handle having a passageway therethrough, the proximal portion handle being outside the body when in use; a distal portion which is at least partially within the body when in use and that has a passageway therethrough; an intermediate portion between said proximal portion handle and said distal portion, said intermediate portion is a hypotube with a spiral cut-out section, the spiral cut-out hypotube having a passageway therethrough and comprising a proximal cut-out helical section adjacent to the proximal portion handle, a distal cut-out helical section adjacent to the distal portion, and an intermediate cut-out helical section between said proximal and distal helical sections, wherein each of said proximal helical section, said distal helical section and said intermediate helical section includes a plurality of adjacent helical turns between adjacent open cut-out helical sections, and said intermediate helical section further comprises an interrupted cut-out spiral section having a plurality of frangible bridge members, each frangible bridge member being a closed section of the hypotube between two adjacent open cut-out helical sections of the intermediate helical section, each closed section frangible bridge member lying along the helical path along which the two cut-out open helical sections lie, the proximal and distal cut-out helical sections being uninterrupted by any bridge member; an actuation member fixedly connected to the proximal portion handle and extending through the tubular carrier member; and whereby proximally directed axial movement of the proximal portion handle and of the activation member initiated outside of the body away from the distal portion axially elongates and breaks one or more of said frangible bridge members thereby disengaging a bond or joint between the actuation member and an interventional medical device in order to deploy the interventional medical device within a body vessel.