| CPC A61B 18/1445 (2013.01) [A61B 17/320092 (2013.01); A61B 2018/00607 (2013.01); A61B 2018/00994 (2013.01)] | 20 Claims |
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1. A treatment instrument, comprising:
a first gripping piece;
a second gripping piece configured to open and close with respect to the first gripping piece;
a shaft connected to the second gripping piece at a distal end of the shaft;
a fixed handle configured to connect to a proximal end of the shaft;
a movable handle configured to move in a direction close to or away from the fixed handle;
a biasing member having a biasing force and configured to bias the movable handle in a direction away from the fixed handle; and
an assist member having an attracting force and configured to attracting the movable handle with respect to the fixed handle,
wherein the second gripping piece is configured to approach with respect to the first gripping piece by moving in a direction toward the first gripping piece in response to a first user operation to the movable handle,
wherein the second gripping piece is configured to move away from the first gripping piece by moving in a direction away from the first gripping piece in response to a second user operation to the movable handle,
wherein a moving range of the movable handle includes a first range and a second range,
wherein the first range is from a first state of the movable handle to a second state of the movable handle, wherein in the first state the second gripping piece is most away from the first gripping piece and in the second state the second gripping piece is most close to the first gripping piece while at the same time the first gripping piece and the second gripping piece are not in contact,
wherein the second range is from the second state of the movable handle to a third state of the movable handle, wherein in the third state the first gripping piece and the second gripping piece are in contact piece, and
wherein, in the second range, the attracting force is smaller than the biasing force.
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