Intragastric balloon devices and methods for performing percutaneous gastronomy in the stomach of a patient are disclosed. The intragastric balloon device can include a support catheter, a main balloon member for use in reducing the functional gastric capacity of the patient's stomach, a support balloon member for anchoring the intragastric balloon device to the gastric wall of the patient, and an inflation mechanism for use in selectively inflating the main and support balloon members. In certain embodiments, an optional insertion device can be provided to facilitate percutaneous insertion and implantation of the intragastric balloon device within the patient.