| 主权项 |
1. A treatment tool for an endoscope, comprising:
a sheath which has a center axis along a longitudinal axis; a pre-curved portion which is disposed at a distal portion of the sheath, and has a restoring force to restore to a curved shape in which the sheath is curved along a virtual plane including the center axis of the sheath; a knife wire lumen which has a center axis at a position spaced from the virtual plane at the pre-curved portion, and is formed along the longitudinal axis of the sheath; a cutting portion which protrudes from an outer circumference surface positioned at an inward side of the curved shape of the pre-curved portion to outside of the pre-curved portion and extends from a distal end portion of the pre-curved portion toward a proximal end portion of the pre-curved portion, the cutting portion being wire-shaped and being capable of incising tissues; a guide wire accommodation portion which is formed along the longitudinal axis of the sheath at a position spaced from the knife wire lumen in a circumferential direction around the center axis of the sheath, and into which a guide wire is capable of being inserted; a proximal slit formation portion which is communicated from the guide wire accommodation portion to the outside of the sheath, the proximal slit formation portion positioned more proximal than a proximal end of the pre-curved portion; and a distal slit formation portion which is extended from the proximal end of the pre-curved portion to an intermediate portion of the pre-curved portion in a direction toward a distal end side of the pre-curved portion and is formed to communicate an outer circumferential surface at an outward side of the curved shape of the pre-curved portion with the guide wire accommodation portion. |
