Methods and instruments for treating obesity

1. A method for treating obesity in a patient having a stomach with a food cavity by implanting a volume filling device that, when implanted in a patient, reduces said food cavity in size by a volume substantially exceeding the volume of said volume filling device, the method comprising the steps of:

inserting a needle or a tube-like instrument into the abdomen of the patient's body;

using said needle or tube-like instrument to fill the patient's abdomen with gas;

placing at least two laparoscopic trocars in the patient's body;

inserting a camera through one of said at least two laparoscopic trocars into the patient's abdomen,

inserting at least one dissecting tool through one of said at least two laparoscopic trocars;

dissecting an area of the stomach;

introducing the volume filling device into the abdominal cavity;

placing the volume filling device on the outside of the stomach wall; and

invaginating the volume filling device in the stomach wall by providing stomach to stomach sutures or staples to the stomach wall from the outside of the stomach wall, thereby positioning the volume filling device so that the volume of the food cavity is reduced in size by a volume substantially exceeding the volume of the volume filling device.

2. The method according to claim 1 , further comprising affixing the volume filling device to the stomach wall by providing sutures or staples reaching from the volume filling device to the stomach wall.

3. The method according to claim 1 , further comprising affixing the volume filling device to the lower part of the patient's esophagus by providing sutures or staples.

4. The method according to claim 1 , further comprising affixing the volume filling device to the patient's diaphragm muscle.

5. The method according to claim 1 , wherein the step of introducing the volume filling device into the abdominal cavity comprises introducing volume filling device comprised of multiple volume filling device segments.

6. The method according to claim 5 , further comprising assembling said multiple volume filling device segments in situ.

7. A method for treating obesity in a patient having a stomach with a food cavity by implanting a volume filling device that, when implanted in a patient, reduces said food cavity in size by a volume substantially exceeding the volume of said volume filling device, the method comprising the steps of:

cutting the skin of the patient's abdomen;

dissecting an area of the stomach;

introducing the volume filling device into the abdominal cavity;

placing the volume filling device on the outside of the stomach wall; and

invaginating the volume filling device in the stomach wall by providing stomach to stomach sutures or staples to the stomach wall from the outside of the stomach wall, thereby positioning the volume filling device so that the volume of the food cavity is reduced in size by a volume substantially exceeding the volume of the volume filling device.

8. The method according to claim 7 , further comprising affixing the volume filling device to the stomach wall by providing sutures or staples reaching from the volume filling device to the stomach wall.

9. The method according to claim 7 , further comprising affixing the volume filling device to the lower part of the patient's esophagus by providing sutures or staples.

10. The method according to claim 7 , further comprising affixing the volume filling device to the patient's diaphragm muscle.

11. The method according to claim 7 , wherein the step of introducing the volume filling device into the abdominal cavity comprises introducing a volume filling device comprised of multiple volume filling device segments.

12. The method according to claim 11 , further comprising assembling said multiple volume filling device segments in situ.