Patent ID: 7678077

Claim:
An injection catheter comprising: a first elongated shaft having a distal end and a proximal end and a first lumen extending therebetween; a needle with a proximal end and a distal end and a needle lumen extending therebetween, the needle disposed within the first lumen of the elongated shaft and extending from a proximal end of the catheter to a distal end of the catheter; a stop collar disposed within the first lumen of the first elongated shaft near the distal end of the needle; the stop collar having a portion thereon configured to prevent lateral movement of the stop collar within the first elongated shaft; a first set of threads located on the needle; and a second set of threads located on the stop collar; wherein rotation of the needle within the first elongated shaft causes longitudinal movement of the stop collar relative to the needle within the first elongated shaft, the positioning of the stop collar within the first elongated shaft controlling a variable extent to which the needle may be extended beyond the distal end of the first elongated shaft.