It is the instrument and the method one of including the material inside the stomach which is introduced to mammalian stomach lumen in order extending possesses the curved line axis which is present around that the stomach interior position, namely resistance out metaplasia or alongside the medial axis of the artificial stomach stone which substantially consists of the indigestible characteristic material to remedy obesity at least. One or it is loaded by the outer part delivery tube with the form where the material inside the plural stomachs was compressed partly, is delivered to the over tube. This over tube has with the proximal edge, the distal (2036) edge and the lumen which the material inside the aforementioned stomach of the aforementioned 1st form tries to receive for delivering to the stomach lumen, the material inside the stomach is expanded to 2nd form in stomach lumen.胃内装置、すなわち耐消化性もしくは実質的に不消化性の材料からなる人工の胃石の中心軸に沿ってその周りに延在する曲線軸を有し、肥満を治療するために哺乳類の胃内腔へ導入される胃内部材を少なくとも1つ含む器具及び方法である。1つ又は複数の胃内部材が部分的に圧縮された形状で外側送達チューブに装填され、オーバーチューブに送達される。このオーバーチューブは近位端、遠位端と、胃内腔への送達のために前記第1の形状の前記胃内部材を受容するようにされたルーメンとを有し、胃内腔において胃内部材は第2の形状へ拡張される。
