SURGICAL INSTRUMENTS WITH DOUBLE SPHERICAL ARTICULATION JOINTS WITH PIVOTABLE LINKS

1 . A surgical instrument, comprising:

a shaft assembly, wherein said shaft assembly defines a shaft axis;

a surgical end effector, wherein said surgical end effector defines an end effector axis, wherein said surgical end effector is coupled to said shaft assembly by an articulation joint configured to facilitate articulation of said surgical end effector relative to said shaft assembly in an articulation plane between an unarticulated position wherein said end effector axis is axially aligned with said shaft axis and articulated positions wherein said end effector axis is not axially aligned with said shaft axis, wherein said articulation joint comprises:

a proximal joint member coupled to said shaft assembly;

a distal joint member coupled to said surgical end effector; and

an articulation linkage assembly comprising a plurality of links, wherein each said link is configured to operably interface with said proximal joint member for movable travel relative thereto in a first proximal travel path and a second proximal travel path that is transverse to said first proximal travel path, and wherein each said link is configured to operably interface with said distal joint member for movable travel relative thereto in a first distal travel path and a second distal travel path that is transverse to said first distal travel path, wherein said articulation linkage assembly defines a central passage extending between said plurality of links, and wherein said surgical instrument further comprises:

a drive member extending through said proximal joint member, said central passage and said distal joint member to operably interface with said surgical end effector; and

at least two flexible actuator members spanning said articulation joint and operably interfacing with said distal joint member to apply articulation motions thereto.