Patent ID: 7766906

Claim:
An occlusion apparatus, comprising: a catheter having an elongate body with a wall, distal end and a proximal end, the elongate body defining: a first lumen including surfaces that define openings from the first lumen through the elongate body wall and a distal end surface, the first lumen being configured to direct saline through the openings, a second lumen including surfaces that define second openings from the second lumen through the distal end surface to apply vacuum to the second openings, a third lumen enclosing an electrical conductor, and a fourth lumen located coaxially in the elongate body and enclosing a guidewire; and a radiofrequency (RF) electrode coupled to the electrical conductor, located proximal the distal end of the elongate body and housed within the elongate body that defines the fourth lumen, wherein the openings are arranged and configured through the elongate body wall and distal end surface to deliver saline in a manner that displaces blood around tissue drawn to the distal end surface by vacuum applied through the second openings, the RF electrode located to distribute RF energy across the tissue through an enhanced conductive path established by the saline, where the catheter is configured to simultaneously conduct RF energy, direct saline solution through the openings through the elongate body wall, and apply vacuum to the second openings through the distal end surface.