Patent ID: 9237837
Filing Date: 2016-01-19
CPC Classification: A61B,G02B

Claim Text:
1. An insertion device comprising: a curving portion which is provided in an insertion portion and curvable between a linear state and a curving state at a maximum curving angle; an operation input unit which is operated by an operator and actuated to curve the curving portion in accordance with the operation; a first elastic member which generates returning force in a first direction by elastic force; a second elastic member which generates returning force in a second direction opposite to the first direction by elastic force; and an acting portion that is provided in the operation input unit, and that abuts the first elastic member or the second elastic member to compress the first elastic member or the second elastic member when the curving portion is curved at a predetermined angle or more in accordance with actuation of the operation input unit, and the acting portion configured to be separated from both the first elastic member and the second elastic member when the curving portion is curved at an angle smaller than the predetermined angle.