Surgical treatment device

1. A surgical treatment device which is used together with an endoscope, comprising:

a sheath which includes a distal end portion, a proximal end portion, and a central axis defined by the distal end portion and the proximal end portion and which is configured to be inserted into a body cavity;

a vein keeper which is arranged on the distal end portion of the sheath and which is configured to hold an extracted blood vessel;

a cutter main body which is arranged on the distal end portion of the sheath and faces the vein keeper in respect to the central axis and which is configured to cut a branch of the extracted blood vessel;

an operation portion which is arranged at the proximal end portion of the sheath and which is configured to be operated in a longitudinal direction of the sheath and is movable in the longitudinal direction of the sheath to move the vein keeper and the cutter main body, wherein the operation portion includes a central axis parallel to the central axis of the sheath;

a first electrode which is arranged on a first surface of the cutter main body which faces the vein keeper;

second and third electrodes which are insulated from each other and which are arranged on a second surface of the cutter main body which is an opposite side with respect to the first surface; and

a switching portion which is arranged on a rear side of the operation portion and is configured to move in a different direction with respect to a moving direction of the operation portion, which is configured to switch between a cutting mode configured to cut the branch when a high frequency (HF) current flows through the first and second electrodes from an energy source and a coagulation mode configured to coagulate a wall portion of the body cavity when a HF current flows through the second and third electrodes from the energy source, and which is configured to prevent a same hand from operating the operation portion when one of the cutting mode and the coagulation mode is switched to the other of the cutting mode and the coagulation mode, wherein the switching portion includes an electrical segment which switches the cutting mode and the coagulation mode, and wherein the switching portion includes a drum which includes the electrical segment arranged thereon and is rotationally movable with respect to the central axis of the operation portion.

2. The surgical treatment device according to claim 1 , wherein the switching portion is movable in a direction deviating from a state parallel to the central axis of the sheath.

3. The surgical treatment device according to claim 1 , wherein the switching portion is movable in a direction orthogonal to the central axis of the sheath.

4. The surgical treatment device according to claim 1 , wherein the switching portion includes an impetus member which energizes to maintain a state of one of the cutting mode and the coagulation mode.

5. The surgical device according to claim 1 , wherein

the sheath further includes a longitudinal axis defined by the distal and end portion and the proximal end portion, and

the operation portion includes a moving member which is movable in an axial direction of the longitudinal axis of the sheath to move the cutter main body along the longitudinal axis of the sheath.

6. The surgical treatment device according to claim 1 , comprising a scope holder which is arranged at a proximal end portion of the operation portion and which is configured to hold the endoscope in a state that the endoscope is aligned with the cutter main body, and

wherein the switching portion is provided between the operation portion and the scope holder.

7. The surgical treatment device according to claim 1 , wherein

an area of the first electrode arranged on the first surface is smaller than each area of the second and third electrodes, and

the area of the second electrode is the same as the area of the third electrode.

8. A surgical treatment device which is used together with an endoscope, comprising:

a sheath which includes a distal end portion, a proximal end portion, and a central axis defined by the distal end portion and the proximal end portion and which is configured to be inserted into a body cavity;

a vein keeper which is arranged on the distal end portion of the sheath and which is configured to hold an extracted blood vessel;

a cutter main body which is arranged on the distal end portion of the sheath and faces the vein keeper in respect to the central axis and which is configured to cut a branch of the extracted blood vessel;

an operation portion which is arranged at the proximal end portion of the sheath and which is configured to be operated in a longitudinal direction of the sheath and is movable in the longitudinal direction of the sheath to move the vein keeper and the cutter main body, wherein the operation portion includes a central axis parallel to the central axis of the sheath;

a first electrode which is arranged on a first surface of the cutter main body which faces the vein keeper;

second and third electrodes which are insulated from each other and which are arranged on a second surface of the cutter main body which is an opposite side with respect to the first surface; and

a switching portion which is arranged on a rear side of the operation portion and is configured to move in a different direction with respect to a moving direction of the operation portion, which is configured to switch between a cutting mode configured to cut the branch when a high frequency (HF) current flows through the first and second electrodes from an energy source and a coagulation mode configured to coagulate a wall portion of the body cavity when a HF current flows through the second and third electrodes from the energy source, and which is configured to prevent a same hand from operating the operation portion when one of the cutting mode and the coagulation mode is switched to the other of the cutting mode and the coagulation mode;

wherein the switching portion includes a support member provided with the operation portion, a revolving member which is rotationally movable with respect to the central axis of the operation portion, a drum which is rotationally movable together with the revolving member, a plurality of electrical contacts which are arranged on the support member, and a plurality of drum-side contacts which are arranged on the drum and brought into contact with the electrical contacts arranged on the support member in accordance with selection of the cutting mode and the coagulation mode.

9. The surgical treatment device according to claim 8 , wherein the switching portion is movable in a direction deviating from a state parallel to the central axis of the sheath.

10. The surgical treatment device according to claim 8 , wherein the switching portion is movable in a direction orthogonal to the central axis of the sheath.

11. The surgical treatment device according to claim 8 , wherein the switching portion includes an impetus member which energizes to maintain a state of one of the cutting mode and the coagulation mode.

12. The surgical device according to claim 8 , wherein

the sheath further includes a longitudinal axis defined by the distal end portion and the proximal end portion, and

the operation portion includes a moving member which is movable in an axial direction of the longitudinal axis of the sheath to move the cutter main body along the longitudinal axis of the sheath.

13. The surgical treatment device according to claim 8 , comprising a scope holder which is arranged at a proximal end portion of the operation portion and which is configured to hold the endoscope in a state that the endoscope is aligned with the cutter main body, and

wherein the switching portion is provided between the operation portion and the scope holder.

14. The surgical treatment device according to claim 8 , wherein

an area of the first electrode arranged on the first surface is smaller than each area of the second and third electrodes, and

the area of the second electrode is the same as the area of the third electrode.