Intragastric balloon device adapted to be repeatedly varied in volume without external assistance

An intragastric balloon device for insertion into a stomach cavity in a body of a patient, comprising:

• a) a flexible bladder;
• b) a reservoir coupled to the bladder and adapted to hold an inflation fluid;
• c) a valve between said bladder and said reservoir;
• and
• d) an inflation fluid within said reservoir,
• wherein when said inflation fluid is heated to a temperature substantially above 98.6° F. said inflation fluid boils and expands through said valve to inflate said bladder,
• said bladder, said reservoir, and said valve are together sized to be positioned, in their entireties, within the stomach cavity.

An intragastric balloon device for insertion into a stomach cavity in a body of a patient, the stomach cavity including at least one of a gas and a liquid fluid, food particles, and bacteria, said device comprising:

• a) a flexible bladder;
• b) a pump coupled to said bladder and adapted to pump fluid from the stomach cavity into said bladder to inflate said bladder;
• and
• c) a control system to operate the pump,
• said bladder, said pump and said control system together sized to be positioned, in their entireties, within the stomach cavity.