Biopsy forceps capable of going through circular channels with minimum bend radius by endoscopy

The utility model discloses a biopsy forceps capable of going through circular channels with minimum bend radius by endoscopy, which can guarantee that the biopsy forceps does not distort after being spread out. The utility model comprises a forceps head component, a dragline, an elastic outer tube and a handle component. The dragline is sheathed in the elastic outer tube. The dragline and the elastic outer tube respectively are connected with the handle component and the forceps head component. The forceps head component comprises a left forceps head, a right forceps head, a left connecting rod, a right connecting rod four rivets, a connecting piece, a guiding spring and a forceps headstock. The forceps headstock is provided with a bar-shaped slot. The retaining rivet positions the left forceps head and the right forceps head in the notch, passing through the notch. The left forceps head and the right connecting rod are sheathed on the right rivet. The right forceps head and the left connecting rod are sheathed on the left rivet. The left connecting rod and the right connecting rod are also connected with the guiding rivet. One end of the connecting piece is sheathed on the guiding rivet. The other end of the connecting piece is connected with the dragline. The utility model is characterized in that one end of the dragline which is connected with the connecting piece is fixed with a guiding elastic tube.