Medical stapler and suturing method

A medical stapler comprising:

• a stapling head including a staple ejection portion;
• an anvil openably and closably coupled to the stapling head by a rotation shaft;
• a staple receiving portion provided in the anvil, the staple receiving portion being provided at a position facing the staple ejection portion when the stapling head and the anvil are in a closed state;
• a lever rotatably provided on the stapling head, wherein the lever is configured to pass through the anvil when the stapling head and the anvil are in a closed state;
• and
• a temporarily immobilizing portion provided in the stapling head, the temporarily immobilizing portion being capable of temporarily immobilizing a treatment target with respect to the stapling head.

A suturing method comprising:

• an insertion step of inserting a medical stapler and an endoscope into a body;
• an advancing step of causing a treatment tool to protrude from the endoscope and advancing the treatment tool with respect to the medical stapler;
• a first open-close step of bringing an anvil into an open state with respect to a stapling head at a portion close to a treatment target;
• a grasping step of grasping a tissue containing the treatment target inside the body with the treatment tool;
• a retracting step of retracting the treatment tool relative to the medical stapler to draw in the treatment target to a proximal-end side of the medical stapler with respect to a staple ejection position;
• a second open-close step of bringing the anvil into a closed state with respect to the stapling head to fix the tissue;
• a lever raising step of raising a lever upward with respect to the stapling head, wherein the lever is configured to pass through the anvil when the anvil and the stapling head are in the closed state;
• an observation step of projecting the treatment target within a field of view showing the endoscope;
• and
• a suturing step of ejecting a staple from the stapling head of the medical stapler to suture a circumference of the treatment target.

A suturing method comprising:

• an insertion step of inserting a medical stapler and an endoscope into a body;
• an advancing step of causing a treatment tool to protrude from the endoscope and advancing the treatment tool with respect to the medical stapler;
• a first open-close step of bringing an anvil into an open state with respect to a stapling head at a portion close to a treatment target;
• a lever raising step of raising a lever upward with respect to the stapling head;
• a grasping step of grasping a tissue containing the treatment target inside the body with the treatment tool;
• a retracting step of retracting the treatment tool relative to the medical stapler to draw in the treatment target to a proximal-end side of the medical stapler with respect to a staple ejection position;
• a second open-close step of bringing the anvil into a closed state with respect to the stapling head;
• a pressing step of pressing the treatment target drawn in to an endoscope side from above by lowering the lever;
• an observation step of projecting the treatment target within a field of view showing the endoscope;
• and
• a suturing step of ejecting a staple from the stapling head of the medical stapler to suture a circumference of the treatment target.