Medical device

A medical device comprising:

• an operation unit operated by a user;
• a shaft member extending in a distal direction from the operation unit;
• and
• a first jaw and a second jaw provided to be openable and closable at a distal end of the shaft member;
• wherein the operation unit comprises:
• a casing, a first operation lever rotatable with respect to the casing and having a first finger hook portion that is annular and that is formed with a first finger hole into which a finger of the user is inserted, and a second operation lever rotatable with respect to the casing and having a second finger hook portion that is annular and that is formed with a second finger hole into which a second finger of the user different from the finger to be inserted into the first finger hole is inserted, the first operation lever and the second operation lever facing each other across the casing;
• the medical device also comprising:
• a power transmission member that is movable along an axial direction of the shaft member and that rotates at least one of the first jaw and the second jaw in such a manner that the first jaw and the second jaw are opened and closed with the movement in the axial direction with respect to the shaft member, the power transmission member moving in the axial direction with respect to the shaft member in conjunction with rotation operation of the first operation lever and the second operation lever with respect to the casing;
• and
• wherein the operation unit further comprises:
• a first toggle mechanism connected to the casing, the first operation lever, and the power transmission member;
• and
• a second toggle mechanism connected to the casing, the second operation lever, and the power transmission member,
• the first toggle mechanism includes a first link and a second link rotatably connected to each other,
• the first link includes a first end rotatably connected to the casing and a second end rotatably connected to the second link,
• the second link includes a third end rotatably connected to the second end and a fourth end rotatably connected to the power transmission member,
• the first operation lever is connected to a connection point between the second end and the third end,
• the second toggle mechanism includes a third link and a fourth link rotatably connected to each other,
• the third link includes a fifth end rotatably connected to the casing and a sixth end rotatably connected to the fourth link,
• the fourth link includes a seventh end rotatably connected to the sixth end and an eighth end rotatably connected to the power transmission member, and
• the second operation lever is connected to a connection point between the sixth end and the seventh end.

A medical device comprising:

• an operation unit operated by a user;
• a shaft member extending in a distal direction from the operation unit;
• and
• a first jaw and a second jaw provided to be openable and closable at a distal end of the shaft member;
• wherein the operation unit comprises:
• a casing, a first operation lever rotatable with respect to the casing and having a first finger hook portion that is annular and that is formed with a first finger hole into which a finger of the user is inserted, and a second operation lever rotatable with respect to the casing and having a second finger hook portion that is annular and that is formed with a second finger hole into which a second finger of the user different from the finger to be inserted into the first finger hole is inserted, the first operation lever and the second operation lever facing each other across the casing;
• the medical device also comprising:
• a power transmission member that is movable along an axial direction of the shaft member and that rotates at least one of the first jaw and the second jaw in such a manner that the first jaw and the second jaw are opened and closed with the movement in the axial direction with respect to the shaft member, the power transmission member moving in the axial direction with respect to the shaft member in conjunction with rotation operation of the first operation lever and the second operation lever with respect to the casing;
• wherein the operation unit further comprises a stopper that stops movement of the power transmission member toward a proximal end of the casing;
• and
• wherein the first jaw and the second jaw include a first electrode and a second electrode, respectively, for cauterizing biological tissue,
• the stopper has a through hole through which a first power line electrically connected to the first electrode and a second power line electrically connected to the second electrode pass, and
• the casing has an insertion hole through which the first power line and the second power line pass, the insertion hole being located proximal to a proximal end of the stopper.