Apparatus for delivering ablation fluid to treat lesions

A surgical apparatus for delivering fluid to treat a lesion comprising:

• a housing;
• an elongated member extending from the housing and having a distal tip and a plurality of openings formed in a sidewall proximal of the distal tip, the openings having a first angular spacing with respect to a longitudinal axis of the elongated member;
• a plurality of hollow fluid delivery members movably positioned in the elongated member, each of the fluid delivery members having a penetrating tip, a lumen and at least one opening communicating with the lumen for delivering fluid to the lesion, the fluid delivery members having a second angular spacing different from the first angular spacing and extendable through the openings in the sidewall of the elongated member;
• a first tube retaining the fluid delivery members at a proximal end thereof and communicating with the fluid delivery members;
• a first retention member retaining the first tube, the retention member being rotated during assembly and fixed in the rotated position;
• and
• an actuator operatively associated with the fluid delivery members, the actuator actuable to a first position to move the plurality of fluid delivery members from a retracted position within the elongated member to a first deployed position extending radially with respect to the elongated member and actuable to a second position to move the plurality of fluid delivery members from the first deployed position to a second deployed position extending further radially with respect to the elongated member.

A surgical apparatus for delivering fluid to treat a lesion comprising:

• a housing;
• an elongated member extending from the housing and having a distal tip and a plurality of openings formed in a sidewall proximal of the distal tip, the openings having a first angular spacing with respect to a longitudinal axis of the elongated member;
• a plurality of hollow fluid delivery members movably positioned in the elongated member, each of the fluid delivery members having a lumen and at least one opening communicating with the lumen for delivering fluid to the lesion, the tips of the fluid delivery members extendable through the openings in the sidewall of the elongated member;
• an actuator for moving the fluid delivery members;
• a first tube retaining the fluid delivery members at a proximal end thereof and communicating with the fluid delivery members;
• a first retention member movable with the actuator and configured to retain the first tube;
• and
• a second retention member spaced axially distally from the first retention member and positioned within the housing and configured to retain the elongated member.