PERI-VASCULAR TISSUE ABLATION CATHETER WITH UNIQUE INJECTION FITTING

摘要

An intravascular catheter for peri-vascular and/or peri-urethral tissue ablation includes multiple needles advanced through supported guide tubes which expand around a central axis to engage the interior surface of the wall of the renal artery or other vessel of a human body allowing the injection an ablative fluid for ablating tissue, and/or nerve fibers in the outer layer or deep to the outer layer of the vessel, or in prostatic tissue. The system may also include a means to limit and/or adjust the depth of penetration of the ablative fluid into and beyond the tissue of the vessel wall. The catheter may also include structures which provide radial and/or lateral support to the guide tubes so that the guide tubes expand uniformly and maintain their position against the interior surface of the vessel wall as the sharpened injection needles are advanced to penetrate into the vessel wall.

主权项

1. A catheter for fluid delivery through at least one injection needle into tissue outside of the interior wall of a target vessel of a human body comprising:
a catheter body having a central axis extending in a longitudinal direction and also having a fluid injection lumen; at least one needle guiding element adapted to expand outwardly toward the interior wall of the target vessel; at least one radial support structure adapted to support each expanded needle guiding element; at least one injection needle having an injection lumen in fluid communication with the fluid injection lumen of the catheter body, the at least one injection needle adapted to be advanced outwardly, guided by the at least one needle guiding element to penetrate the interior wall of the target vessel, the at least one injection needle having a distal opening for fluid delivery into the tissue outside of the interior wall of the target vessel.