Patent ID: 8235990

Claim:
A method of creating a lesion on an irregular surface of soft tissue, the method comprising: advancing a treatment device to the irregular surface, where the treatment device comprises an opening exposing an electrode, the treatment device also comprising a vacuum lumen in fluid communication with a vacuum source and a fluid perfusion lumen in fluid communication with a fluid source, where both the vacuum lumen and fluid perfusion lumen are fluidly coupled to the opening; drawing a vacuum in the vacuum source to cause a drop in pressure in both the vacuum lumen and the opening, whereupon placing the opening against the soft tissue creates a seal against the soft tissue to cause the fluid perfusion lumen to drop in pressure resulting in fluid flow from the fluid source through the fluid perfusion lumen across the opening and through the vacuum lumen, where when uncovered the opening prevents the perfusion lumen from reducing in pressure preventing fluid flow; and energizing the electrode during the fluid flow to create the lesion in the irregular surface of soft tissue.