Patent ID: 8821531
Filing Date: 2014-09-02
Classification: A61B

Abstract:
1. A treatment tool comprising: an elongated shaft member having a distal end portion and a proximal end portion, and a longitudinal axis extending from the distal end portion to the proximal end portion; a pair of grasping members installed at the distal end portion of the elongated shaft member so as to be freely opened and closed with each other to grasp a target area; a driving force transmission member connected to the pair of grasping members and extending along the longitudinal axis so as to be freely moved along the longitudinal axis with respect to the elongated shaft member; a driving manipulation member connected to a proximal end portion of the driving force transmission member and configured to be capable of being manipulated so that the driving force transmission member moves with respect to the elongated shaft member; a switch unit having a first section and a second section in which the driving manipulation member is capable of sliding; and a manipulation unit main body installed at tile proximal end portion of the elongated shaft member, wherein the switch unit is configured to switch between a first state in which the driving manipulation member is rotated about a first rotational axis with respect to the manipulation unit main body and a second state in which the driving manipulation member is rotated about a second rotational axis different from the first rotational axis with respect to the manipulation unit main body, the first state being a state in which the driving manipulation member is slid in the first section, and the second state being a state in which the driving manipulation member is slid in the second section, a ratio of a magnitude of a force for moving the driving force transmission member with respect to a magnitude of a force for sliding the driving manipulation member is a first ratio when the driving manipulation member is slid in the first section, and the ratio is a second ratio different from the first ratio when the driving manipulation member is slid in the second section.