PROBLEM TO BE SOLVED: To strongly connect a flexible tube of a small diameter and a flexible tube of a large diameter.SOLUTION: An outer cylinder 24 is opened at a proximal end 24b and a distal end 24c thereof, and an inner diameter of the outer cylinder 24 is gradually reduced from the proximal end 24b to the distal end 24c. An inner cylinder 23 is fitted into a proximal end part 21b of a narrow first flexible tube 21, and a distal end part 22b of a second flexible tube 22 clutches the proximal end part 21b of the first flexible tube 21. A part where the proximal end part 21b of the first flexible tube 21, the distal end part 22b of the second flexible tube 22 and the inner cylinder 23 are superimposed is fitted from the proximal end 24b of the outer cylinder 24 to the outer cylinder 24, and the outer cylinder 24 tightens the part, where the proximal end part 21b of the first flexible tube 21, the distal end part 22b of the second flexible tube 22 and the inner cylinder 23 are superimposed, from the outside of the second flexible tube 22 to the inside.COPYRIGHT: (C)2013,JPO&INPIT【課題】細い径の可撓性チューブと太い径の可撓性チューブを強固に接続できるようにする。【解決手段】外筒24が基端24bと先端24cで開口し、外筒24の内径が基端24bから先端24cに向かい漸減し、内筒23が細い第一可撓性チューブ21の基端部21bに嵌め込まれ、第二可撓性チューブ22の先端部22bが第一可撓性チューブ21の基端部21bをくわえ込み、第一可撓性チューブ21の基端部21bと第二可撓性チューブ22の先端部22bと内筒23の重なり合った部分が外筒24の基端24bから外筒24に嵌め込まれ、外筒24が第一可撓性チューブ21の基端部21bと第二可撓性チューブ22の先端部22bと内筒23の重なり合った部分を第二可撓性チューブ22の外から内へ締め付ける。【選択図】図2
