Catheters; Medical devices for use in treating or diagnosing gallstone disease; Medical devices for use in treating or diagnosing gastrointestinal disease; Medical devices for use in treating gallstone disease; Medical devices for use in treating gastrointestinal disease; Catheters for use in gastrointestinal ablation; Medical and surgical catheters; Medical devices, namely, surgical devices that facilitate the identification, separation or ablation of biologic tissues; Medicinal catheters