Medical stapler

1 . A medical stapler provided at a distal end of an endoscope, the medical stapler comprising:

a first grasping member;

a second grasping member connected to the first grasping member so that the first grasping member and the second grasping member are configured to be opened and closed;

a wire extending in an axial direction of the endoscope; and

a staple release part having a cartridge configured to accommodate a staple and an injection mechanism connected to a distal end of the wire and configured to eject the staple from the cartridge, wherein:

the cartridge is provided so that the cartridge is removably attached to the staple release part;

the injection mechanism includes a rotation member configured to rotate about a rotation shaft;

the rotation member is movable from a first position that is an initial position to a second position where the staple is ejected by manipulating the wire;

the injection mechanism is located at the second position when the cartridge is removed from the staple release part;

the injection mechanism moves from the second position to the first position when the cartridge is attached to the staple release part;

the staple release part is positioned on a distal end side of the first grasping member relative to the rotation shaft:

the rotation member has a convex part extending radially from the rotation shaft;

the staple is configured to be released from the cartridge in a direction from the first grasping member toward the second grasping member;

the staple release part has a support member configured to move in a direction that the staple is released with respect to the cartridge;

the cartridge has a slit extending in the direction that the staple is released; and

a part of the convex part is configured to pass through the slit and be in contact with the support member when the rotation member moves between the first position and the second position with respect to the cartridge.

2 . The medical stapler according to claim 1 , wherein:

the support member is movable in a vertical direction by supporting the staple from a downward direction; and

when the wire is pulled:

the injection mechanism moves the support member from the downward direction to an upward direction while moving from the first position to the second position; and

the staple is ejected from the staple release part in the upward direction by the support member.

3 . The medical stapler according to claim 2 , wherein:

the cartridge includes a pushing part located in the downward direction of the support member;

the pushing part moves from the downward direction to the upward direction of the injection mechanism located at the second position when the cartridge is removed from the staple release part; and

the injection mechanism located at the second position is pushed from the upward direction to the downward direction and moved to the first position when the cartridge is attached to the staple release part.

4 . The medical stapler according to claim 3 , wherein the pushing part includes the slit open in the downward direction, and wherein the pushing part moves from the downward direction to the upward direction of the injection mechanism by allowing the injection mechanism to pass through the slit when the cartridge is removed from the staple release part.

5 . The medical stapler according to claim 1 , wherein the cartridge is attached to the staple release part in a state in which the staple is accommodated.

6 . The medical stapler according to claim 1 , wherein the injection mechanism is rotatable between the first position and the second position.

7 . The medical stapler according to claim 1 , wherein the cartridge is configured to accommodate the staple being substantially U-shaped and having an opening in an upward direction, and wherein a marking member including a material highlighted by image enhancement light is connected to the staple in a downward direction.

8 . The medical stapler according to claim 7 , wherein the staple includes a material highlighted by image enhancement light.

9 . The medical stapler according to claim 7 , wherein the marking member has a dimension of a part projecting from the staple larger than a wire diameter of the staple.

10 . The medical stapler according to claim 7 , wherein the support member is configured to support the staple from a downward direction, the support member being movable in a vertical direction, and wherein the support member has a relief part configured to accommodate the marking member.

11 . The medical stapler according to claim 10 , wherein the marking member has a dimension in which the marking member is configured to be accommodated in the relief part.

12 . The medical stapler according to claim 7 , wherein the marking member is fixed to the staple.

13 . The medical stapler according to claim 2 , wherein, when the injection mechanism has moved from the first position to the second position, the support member is connected to the staple and ejected from the staple release part together with the staple in the upward direction.

14 . The medical stapler according to claim 13 , wherein the support member has a concave part having a groove shape concave in the downward direction, the concave part being configured to support the staple from the downward direction, and wherein a diameter of the groove shape in the concave part is slightly smaller than a diameter of the staple.

15 . The medical stapler according to claim 13 , wherein the support member has a concave part having a groove shape concave in the downward direction, the concave part being configured to support the staple from the downward direction, and wherein the concave part has at least a part of an opening in the upward direction in the groove shape, the part of the opening being smaller than a diameter of the staple.