Disclosed is a cryogenic catheter probe, cryogenic ablation system, and use thereof for performing cryogenic ablation of mucosal tissue and/or of both mucosal tissue and submucosal tissue in the gastrointestinal tract of a subject. The cryogenic catheter probe includes a chamber and a channel assembly housed within the chamber. The channel assembly includes a central rail, at least one cryogenic fluid delivery channel, a delivery channel guide, and a sprayer guide. The at least one cryogenic fluid delivery channel has a fluid delivery channel portion and a sprayer connected to the fluid delivery channel portion, and is mounted on the central rail for longitudinal movement along the central rail. The sprayer is configured to release cryogenic spray in at least one treatment zone along the hollow body portion of the chamber.