Dissecting device and dissecting system

A dissecting system comprising:

• a first dissecting device insertable into a living body and movable along a blood vessel, the first dissecting device comprising:
• a first dissecting member configured to dissect tissue surrounding the blood vessel in the living body when the first dissecting member moves forward along the blood vessel in the living body, the first dissecting member comprising a first dissecting section, two second dissecting sections, and a first treating section,
• the first dissecting section extending in an axial direction and possessing a thickness direction and a width direction, the first dissecting section possessing a first lateral side and a second lateral side opposite the first lateral surface in the width direction,
• one of the two second dissecting sections protruding downward in the thickness direction of the first dissecting section from the first lateral side of the first dissecting section and an other of the two second dissecting sections protruding downward in the thickness direction of the first dissecting section from the second lateral side of the first dissecting section, the two second dissecting sections comprising first guide sections configured to guide a branch vessel branched from the blood vessel to the first treating section, and
• the first treating section being configured to perform a predetermined treatment of the branch vessel when the first guide sections guide the branch vessel to the first treating section;
• and
• a second dissecting device insertable into the living body and movable along the blood vessel, the second dissecting device comprising:
• a second dissecting member configured to dissect the tissue surrounding the blood vessel in the living body when the second dissecting member moves forward along the blood vessel in the living body, the second dissecting member comprising a dissecting section, two protruding sections, and a second treating section,
• the two protruding sections protruding upward in the thickness direction of the dissecting section from both sides of the dissecting section in the width direction, the two protruding sections comprising second guide sections configured to guide the branch vessel to the second treating section, and
• the second treating section configured to perform the predetermined treatment of the branch vessel.

A dissecting method for dissecting tissue surrounding a blood vessel in a living body using a dissecting device, the method comprising:

• introducing the dissecting device into the living body by way of an incision, the dissecting device comprising a main body and two protruding portions, the main body possessing a thickness direction, the two protruding portions protruding beyond the main body in the thickness direction of the main body in a first direction during the introducing of the dissecting device into the living body;
• rotating the dissecting device to a rotated position while the dissecting device is in the living body so that the protruding portions protrude beyond the main body in the thickness direction of the main body in a second direction, the second direction being diametrically opposite the first direction;
• and
• dissecting the tissue surrounding the blood vessel in the living body by moving the dissecting device forward along the blood vessel while the dissecting device is in the rotated position.