An artificial stomach for replacing the normal stomach of a patient who has had his/her stomach surgically removed, comprising: a food reservoir adapted to collect food, an inlet connected to a first opening of the food reservoir and further being adapted to upstream connect to the patient's gastrointestinal tract , and an outlet connected to a second opening of the food reservoir and further being adapted to downstream connect to the patient's gastrointestinal tract , and a connector adapted to upstream connect the inlet to the patient's gastrointestinal tract , or downstream connect the outlet to the patient's gastrointestinal tract , said connector comprising a conduit fixedly attached at a first, proximal end on the outside the artificial stomach and in fluid connection to the food passageway, where the proximal part of the conduit is formed like a tube , and distal to the tube a bulge is formed, wherein the connector further comprises at least one of: a blocking ring arranged to be pushed against the bulge , the ring having an inner diameter less than the outer diameter of said bulge but large enough to allow the intestinal/oesophageal wall to be placed between said ring and said tube , thereby adapted to stop said intestinal/oesophageal wall from slipping away from the tube ; and a flexible sleeve arranged to be rolled upon itself and then unrolled to cover part of the tube and the oesophagus or intestine , which is arranged to be pulled over the second end of the conduit sufficiently far so as to extend also over the bulge. a food reservoir adapted to collect food, an inlet connected to a first opening of the food reservoir and further being adapted to upstream connect to the patient's gastrointestinal tract , and an outlet connected to a second opening of the food reservoir and further being adapted to downstream connect to the patient's gastrointestinal tract , and a connector adapted to upstream connect the inlet to the patient's gastrointestinal tract , or downstream connect the outlet to the patient's gastrointestinal tract , said connector comprising a conduit fixedly attached at a first, proximal end on the outside the artificial stomach and in fluid connection to the food passageway, where the proximal part of the conduit is formed like a tube , and distal to the tube a bulge is formed, wherein the connector further comprises at least one of: a blocking ring arranged to be pushed against the bulge , the ring having an inner diameter less than the outer diameter of said bulge but large enough to allow the intestinal/oesophageal wall to be placed between said ring and said tube , thereby adapted to stop said intestinal/oesophageal wall from slipping away from the tube ; and a flexible sleeve arranged to be rolled upon itself and then unrolled to cover part of the tube and the oesophagus or intestine , which is arranged to be pulled over the second end of the conduit sufficiently far so as to extend also over the bulge. a blocking ring arranged to be pushed against the bulge , the ring having an inner diameter less than the outer diameter of said bulge but large enough to allow the intestinal/oesophageal wall to be placed between said ring and said tube , thereby adapted to stop said intestinal/oesophageal wall from slipping away from the tube ; and a flexible sleeve arranged to be rolled upon itself and then unrolled to cover part of the tube and the oesophagus or intestine , which is arranged to be pulled over the second end of the conduit sufficiently far so as to extend also over the bulge. <EOS>