Patent ID: 8303621

Claim:
A surgical treatment instrument comprising: an insertion portion; an operation portion provided on a proximal end of the insertion portion; a treatment portion provided so as to extend from a distal end of the insertion portion; two gripping members provided on the treatment portion, each having a gripping face; a variable angle operating member provided on the operation portion to change the treatment portion to a predetermined angle by being operated to move in a direction along a distal end side and a proximal end side of the operation portion; a transmitting member to change an angle of the treatment portion by moving forward/backward along a longitudinal axial direction of the insertion portion in conjunction with the operation of the variable angle operating member; a braked member provided within the operation portion, the braked member being connected to the transmitting member which moves forward/backward by the operation of the variable angle operating member, and moving forward/backward within the operating portion; a braking member provided within the operation portion to brake the braked member; an open/close operating member provided at the operation portion and operatively connected with the braking member and at least one of the two gripping members so as to move the at least one of the two gripping members for performing opening/closing; and a pressing member which has the braking member and presses the open/close operating member in a direction of separating from the braked member, wherein: when the open/close operating member is displaced to an operation position by an operation against the pressing force of the pressing member so as to move the at least one of the two gripping members for performing the opening/closing, the opening/closing operation member simultaneously presses the braking member toward the braked member in conjunction with bending of the pressing member so as to increase a friction resistance with respect to the braked member, so that the movement of the braked member is stopped to brake the forward/backward movement of the transmitting member to thereby maintain the predetermined angle of the treatment portion, and when the operation of the open/close operating member is released such that the open/close operating member is displaced from the operation position to a non-operation position by being pressed by the pressing member, the braking member simultaneously moves in conjunction with restoration of the pressing member, so that the pressing of the braking member toward the braked member is released to lower the friction resistance and the braked member is made movable to allow the forward/backward movement of the transmitting member.