Patent ID: 7422587

Claim:
A method of forming a lesion pattern in submucosal tissue at or near a sphincter comprising providing a tissue treatment device comprising a catheter, an operative element carried by the catheter comprising a plurality of tissue-piercing energy delivery devices movable between a retracted position within the catheter and an extended position protruding from the catheter, an expandable member carried by the catheter adjacent the plurality of tissue-piercing energy delivery devices movable between a collapsed condition and an expanded condition, and a lumen adjacent the tissue-piercing energy delivery devices to convey fluid, preparing the tissue treatment device for deployment at or near a sphincter by placing the expandable member in the collapsed condition and placing the tissue-piercing energy delivery devices in the retracted position, advancing the catheter toward the sphincter until the tissue treatment device is located in a tissue region at or near the sphincter, coupling a source of air under pressure to the lumen, conveying air through the lumen at a pressure that varies according to proximity of the plurality of tissue-piercing energy delivery devices to tissue, manipulating the catheter while sensing variations in the pressure, wherein the sensed pressure increases with proximity of the plurality of tissue-piercing energy delivery devices to tissue, monitoring the variations in the pressure until a desired pressure condition is sensed indicative of positioning the plurality of tissue-piercing energy delivery devices at a desired treatment site at or near the sphincter, expanding the expandable member in the desired treatment site to exert an opening force upon tissue in the desired treatment site, moving the plurality of tissue-piercing energy delivery devices to the extended condition into submucosal tissue in the desired treatment site, delivering energy from the tissue-piercing energy delivery devices to produce a plurality of submucosal lesions in submucosal tissue comprising the lesion pattern at or near the sphincter, and coupling a source of cooling fluid to the lumen, and conveying the cooling fluid through the lumen to cool surface tissue adjacent the submucosal tissue.