Patent ID: 7399294

Claim:
An injection catheter assembly comprising: a first elongated member having a proximal end, a distal end, and an external diameter; 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, the second elongated member having a piercing tip and being moveable with respect to the first elongated member, and a third elongated member, the third elongated member having a stop, the third elongated member positioned between the second elongated member and the first elongated member; the third elongated member defining a lumen along a portion of the length of the first elongated member, the third elongate member being rotatable with respect to the first elongate member, the degree of rotation of a first helical member of the third elongated member adjusting the distance that a piercing tip can extend from the distal end of the first elongated member, wherein the second elongated member has a flange and the distal travel of the flange is prevented beyond the stop.