An instrumentation for carrying out a gastrointestinal bypass comprises means for bringing close together a first tissue portion (12) of the intestine and second tissue portion (14) of the stomach by realising a first intestine loop (A), means for creating a gastroenteroanastomosis (16) between the two close tissue portions, for example a linear stapler, maintaining or restoring the continuity of the intestinal duct after the realisation of the gastroenteroanastomosis, means for bringing close together an additional first tissue portion (18) of the intestine, arranged distally with respect to the gastroenteroanastomosis (16) with reference to the natural flow of the food along the intestinal duct, and an additional second tissue portion (20) of the intestine arranged proximally with respect to the gastroenteroanastomosis (16) with reference to the natural flow of the food along the intestinal duct, realising a second loop (B) of the intestine, wherein said additional second tissue portion (20) of the intestine arranged proximally with respect to the gastroenteroanastomosis (16) is brought close to the gastroenteroanastomosis (16), means for creating an enteroenteroanastomosis (22) between the two close tissue portions of the intestine, maintaining or restoring the continuity of the intestinal duct after the realisation of the enteroenteroanastomosis, and means for sectioning the intestine between the gastroenteroanastomosis (16) and the enteroenteroanastomosis (22).一種實施胃腸分流術之裝置包含:用於將該腸之第一組織部份(12)帶入接近至該胃之第二組織部份(14)之機構,藉此實現第一迴圈(A);用於在該二接近組織部份之間建立一胃腸吻合部位(16)之機構,譬如一線性釘合器,在實現該胃腸吻合部位之後維持或恢復該腸管之連續性;用於將該腸之一額外第一組織部份(18)及該腸之一額外第二組織部份(20)帶入緊接在一起之機構,該額外第一組織部份係參考沿著該腸管之食物自然流動相對該胃腸吻合部位(16)遠側地配置,且額外之第二組織部份係參考沿著該腸管之食物自然流動相對該胃腸吻合部位(16)近側地配置,該機構可實現該腸之第二迴圈(B),其中該腸相對該胃腸吻合部位(16)近側地配置之額外第二組織部份(20)被帶入接近至該胃腸吻合部位(16);用於在該腸的二接近組織部份之間建立一腸與腸吻合術部位(22)之機構,並在實現該腸與腸吻合部位之後維持或恢復該腸管之連續性;及用於在該胃腸吻合部位(16)及該腸與腸吻合部位(22)之間剖切該腸之機構。12‧‧‧第一組織部份14‧‧‧第二組織部份16‧‧‧胃腸吻合部位18‧‧‧額外的第一組織部份20‧‧‧額外的第二組織部份22‧‧‧腸與腸吻合部位24‧‧‧
