An implantable medical device for treating reflux disease in a human patient, the implantable medical device comprising a movement restriction device (10) having an outer surface including a biocompatible material. The movement restriction device is adapted to be fully invaginated by the stomach fundus wall (16) of the patient, such that movement of the cardiac notch of the patients stomach towards the patients diaphragm is restricted, thereby preventing the cardia (14) from sliding through the patients diaphragm opening into the patients thorax. The implantable medical device further comprises a holding device adapted to be held by a surgical instrument, wherein the holding device is at least partly placed inside the outer wall of the implantable medical device.
