Patent ID: 7625356

Claim:
An injection catheter assembly, comprising: a first elongated member having a proximal end, a distal end, an external surface, and an inside surface defining a first lumen; a second elongated member having a proximal region and a distal region, the second elongated member positioned at least partially within the first elongated member and the second elongated member having a second helical member fixed to an end; a third elongated member, the third elongated member defining a second lumen along a portion of the length of the first elongated member and the third elongated member having a first helical member; wherein the first and second helical members are rotatably engageable with one another and the second helical member is longitudinally moveable within the first lumen of the first elongated member to move the second elongated member longitudinally, and the second helical member is biased to expand in diameter.