Methods, devices, and systems for obesity treatment

1. A gastric balloon structure for deploying in a gastric cavity of a patient, comprising:

at least two isolated non-concentric inflatable chambers, wherein

each chamber of the at least two isolated non-concentric inflatable chambers has a respective inflated state volume such that deflation of any single chamber of the at least two isolated non-concentric inflatable chambers leaves the inflated state volume of the remaining chambers of the at least two isolated non-concentric inflatable chambers unaffected, and

the walls of each chamber are comprised of two layers of silicone bonded to one another including an inner layer and outer layer, wherein

the inner layer has a greater strength than the outer layer, and

the outer layer has a greater acid resistance than the inner layer;

a valve system for introducing a fluid into the at least two isolated non-concentric inflatable chambers and for retaining, upon inflation, the fluid in the at least two isolated non-concentric inflatable chambers; and

a flexible member spanning a gap between and fixedly attached to both a first chamber of the at least two isolated non-concentric inflatable chambers and a second chamber of the at least two isolated non-concentric inflatable chambers, said flexible member being in fluid communication with the valve system and carrying inflation tubes that are in fluid communication with the at least two isolated non-concentric inflatable chambers;

wherein the gastric balloon structure, in its inflated state, assumes a curved shape conforming to a natural three-dimensional kidney shape of the gastric cavity, such that the flexible member flexibly conforms, upon at least partially filling the at least two isolated non-concentric inflatable chambers, the gastric balloon structure to the natural three-dimensional kidney shape of the gastric cavity;

and wherein, after inflation, the gastric balloon structure is configured to float freely without tethering in the gastric cavity.

2. The gastric balloon structure of claim 1 , wherein the gastric balloon structure is designed to provide for modulated passage of food through the gastric cavity upon inflation.

3. The gastric balloon structure of claim 2 , wherein the inflated state volumes of the at least two isolated non-concentric inflatable chambers are configured to leave in the gastric cavity a residual volume proximal to the gastric balloon structure unoccupied by the gastric balloon structure during a resting state of the gastric cavity, and wherein said residual volume is 10 ml to 100 ml.

4. The gastric balloon structure of claim 1 , wherein, upon inflation, the gastric balloon structure is configured to rest within the gastric cavity without exerting pressure at any point in the gastric cavity sufficient to cause ulceration.

5. The gastric balloon structure of claim 4 , wherein an outer surface of each of the isolated non-concentric inflatable chambers is configured to align against greater and lesser curvatures of the gastric cavity.

6. The gastric balloon structure of claim 1 , wherein said inflation tubes include a first inflation tube and a second inflation tube, the first inflation tube being connected by a first orifice to the first chamber of the at least two isolated non-concentric inflatable chambers, the second inflation tube being connected by a second orifice to the second chamber of the at least two isolated non-concentric inflatable chambers.

7. The gastric balloon structure of claim 6 , wherein the first orifice is oriented in a first radial direction perpendicular to a longitudinal axis of the structure and the second orifice is oriented in a second radial direction which is offset from the first radial direction.

8. The gastric balloon structure of claim 1 , wherein the gastric balloon structure is designed to maintain the inflated state volume of each of the at least two isolated non-concentric inflatable chambers while deployed in the gastric cavity of the patient without controlled adjustment.

9. The gastric balloon structure of claim 1 , wherein each chamber of the at least two isolated non-concentric inflatable chambers is filled with a same fluid.

10. The gastric balloon structure of claim 1 , further comprising a protective sheath which surrounds at least a portion of the gastric balloon structure.

11. A gastric balloon structure for deploying in a gastric cavity of a patient, comprising:

at least two isolated non-concentric inflatable chambers, wherein

each chamber of the at least two isolated non-concentric inflatable chambers has a respective inflated state volume such that deflation of any single chamber of the at least two isolated non-concentric inflatable chambers leaves the inflated state volume of the remaining chambers of the at least two isolated non-concentric inflatable chambers unaffected, and

the walls of each chamber comprise two layers of silicone bonded to one another including an inner layer and outer layer, wherein

the inner layer has a greater strength than the outer layer, and

the outer layer has a greater acid resistance than the inner layer;

a valve system for introducing a fluid into the at least two isolated non-concentric inflatable chambers and for retaining, upon inflation, the fluid in the at least two isolated non-concentric inflatable chambers; and

a flexible member spanning a gap between and fixedly attached to both a first chamber of the at least two isolated non-concentric inflatable chambers and a second chamber of the at least two isolated non-concentric inflatable chambers, wherein

the flexible member encloses an inflation lumen for introducing the fluid into the at least two isolated non-concentric inflatable chambers via the valve system;

wherein the gastric balloon structure, in its inflated state, assumes a curved shape conforming to a natural three-dimensional kidney shape of the gastric cavity, such that the flexible member flexibly conforms, upon at least partially filling the at least two isolated non-concentric inflatable chambers, the gastric balloon structure to the natural three-dimensional kidney shape of the gastric cavity;

and wherein, after inflation, the gastric balloon structure is configured to float freely without tethering in the gastric cavity.