Surgical stapler

1 . 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 (D 2 ), the first bending tension member ( 400 ) passively contacts the first protruding structure ( 131 ), expanding along a first direction (D 1 ) 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 (D 1 ), the second bending tension member ( 500 ) passively contacts the second protruding structure ( 141 ), expanding along the second direction (D 2 ) 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 (D 1 ) to generate additional tension force;

the second bending tension member ( 500 ) contacts the second protruding structure ( 141 ), expanding along the second direction (D 2 ) to generate additional tension force.

2 . The surgical stapler according to claim 1 , wherein the tension force generated by the first bending tension member ( 400 ) and the tension force generated by the second bending tension member ( 500 ) are kept in balance.

3 . The surgical stapler according to claim 1 , wherein the intermediate connecting member ( 100 ) is a one-piece structure;

the first channel ( 130 ) or the second channel ( 140 ) is respectively continuous;

the side of the first channel ( 130 ) close to the second channel ( 140 ) is integrally formed as the first protruding structure ( 131 );

the side of the second channel ( 140 ) close to the first channel ( 130 ) is integrally formed as the second protruding structure ( 141 ).

4 . The surgical stapler according to claim 1 , wherein the intermediate connecting member ( 100 ) is a multi-piece assembly structure;

the first channel ( 130 ) comprises a plurality of first sub-channels ( 1121 );

the second channel ( 140 ) comprises a plurality of second sub-channels ( 1131 );

a side of any of the first sub-channels ( 1121 ) close to the second sub-channels ( 1131 ) is provided with the first protruding structure ( 131 );

a side of any of the second sub-channels ( 1131 ) close to the first sub-channels ( 1121 ) is provided with the second protruding structure ( 141 ).

5 . The surgical stapler according to claim 1 , wherein, when the first bending tension member ( 400 ) is forced to pull the end effector assembly ( 200 ) to bend along the first direction (D 1 ), the first bending tension member ( 400 ) is positioned on a side of the first channel ( 130 ) away from the second channel ( 140 );

when the second bending tension member ( 500 ) is forced to pull the end effector assembly ( 200 ) to bend along the second direction (D 2 ), the second bending tension member ( 500 ) is positioned on a side of the second channel ( 140 ) away from the first channel ( 130 ).

6 . The surgical stapler according to claim 1 , wherein, when the first bending tension member ( 400 ) is forced to pull the end effector assembly ( 200 ) to bend along the first direction (D 1 ), an amount of deformation of the first bending tension member ( 400 ) is less than an amount of deformation of the second bending tension member ( 500 );

when the second bending tension member ( 500 ) is forced to pull the end effector assembly ( 200 ) to bend along the second direction (D 2 ), the amount of deformation of the second bending tension member ( 500 ) is less than the amount of deformation of the first bending tension member ( 400 ).

7 . The surgical stapler according to claim 1 , wherein the intermediate connecting member ( 100 ) is elastic;

when the end effector assembly ( 200 ) bends along the first direction (D 1 ), the intermediate connecting member ( 100 ) is compressed on a side facing the first direction (D 1 ) to provide supporting force and stretches on a side facing the second direction (D 2 );

when the end effector assembly ( 200 ) bends along the second direction (D 2 ), the intermediate connecting member ( 100 ) is compressed on the side facing the second direction (D 2 ) to provide supporting force and stretches on the side facing the first direction (D 1 ).

8 . The surgical stapler according to claim 1 , further comprising a handle assembly ( 11 );

wherein the handle assembly ( 11 ) comprises a drive assembly;

the first bending tension member ( 400 ) and the second bending tension member ( 500 ) are respectively connected to the drive assembly;

the drive assembly is configured to tighten the first bending tension member ( 400 ) and loosen the second bending tension member ( 500 ), thereby driving the end effector assembly ( 200 ) to bend along the first direction (D 1 );

the drive assembly is configured to tighten the second bending tension member ( 500 ) and loosen the first bending tension member ( 400 ), thereby driving the end effector assembly ( 200 ) to bend along the second direction (D 2 ).

9 . The surgical stapler according to claim 1 , wherein the tension force generated by the first bending tension member ( 400 ) and the tension force generated by the second bending tension member ( 500 ) are kept in balance.