Surgical stapler

A surgical stapler comprising an intermediate connecting member (100), an end effector assembly (200), a first bending tension member (400), and a second bending tension member (500);

• wherein the intermediate connecting member (100) comprises a first channel (130) and a second channel (140);
• the first bending tension member (400) is configured to pass through the first channel (130) to connect to the end effector assembly (200);
• the second bending tension member (500) is configured to pass through the second channel (140) to connect to the end effector assembly (200);
• a first protruding structure (131) is provided on a side of the first channel (130) close to the second channel (140);
• when the second bending tension member (500) is forced to pull the end effector assembly (200) to bend along a second direction (D2), the first bending tension member (400) passively contacts the first protruding structure (131), expanding along a first direction (D1) to generate additional tension force;
• wherein a second protruding structure (141) is provided on a side of the second charmel (140) close to the first channel (130);
• when the first bending tension member (400) is forced to pull the end effector assembly (200) to bend along the first direction (D1), the second bending tension member (500) passively contacts the second protruding structure (141), expanding along the second direction (D2) to generate additional tension force;
• wherein, when end effector assembly (200) is not bent, the first bending tension member (400) contacts the first protruding structure (131), expanding along the first direction (D1) to generate additional tension force;
• the second bending tension member (500) contacts the second protruding structure (141), expanding along the second direction (D2) to generate additional tension force.