Articulating endoscopic surgical clip applier

1. An apparatus for application of surgical clips to body tissue, the apparatus comprising:

a shaft assembly including:

an articulating neck assembly;

an end effector assembly supported on a distal end of the articulating neck assembly, the end effector assembly being configured to form a surgical clip in place on the body tissue, the end effector assembly including:

a drive sled slidably axially translatable within the end effector assembly, the drive sled defining a helical lumen;

an advancer plate slidably disposed within the end effector assembly;

at least one clip disposed in the end effector assembly;

jaws configured to receive and form the at least one clip;

a pusher bar configured to load the at least one clip into the jaws, wherein the pusher bar is detachably connected to the advancer plate; and

a drive bar configured to selectively engage the pusher bar to effectuate a closure of the jaws; and

a rotatable drive member operatively connected to the end effector assembly, wherein a rotation of the drive member results in a loading of the at least one clip into the jaws and in a closing of the jaws,

wherein the rotatable drive member includes an end effector drive screw threadably engaged with the helical lumen of the drive sled,

wherein the rotation of the rotatable drive member results in a rotation of the end effector drive screw and an axial translation of the drive sled, and

wherein during a distal advancement of the pusher bar, the pusher bar engages the advancer plate to distally move the advancer plate.

2. The apparatus according to claim 1 , wherein the drive sled is selectively engaged with the pusher bar such that a distal advancement of the drive sled results in distal advancement of the pusher bar for a given distance and then the drive sled disconnects from the pusher bar after the given distance.

3. The apparatus according to claim 1 , wherein the pusher bar remains in a distally advanced position during an approximation of the jaws.

4. The apparatus according to claim 1 , wherein the advancer plate includes a tab for selective engagement by the pusher bar as the pusher bar is advanced distally.

5. The apparatus according to claim 1 , wherein the end effector assembly further includes a clip follower slidably supported within the end effector assembly for urging surgical clips disposed within the end effector assembly in a distal direction, the clip follower including an upper tab projecting from a first surface and a lower tab projecting from a second surface, wherein the upper tab of the clip follower engages the advancer plate as the advancer plate is moved distally such that the clip follower is moved distally to advance the surgical clips, and wherein the lower tab of the clip follower engages a feature as the advancer plate is moved proximally such that the clip follower remains stationary.

6. The apparatus according to claim 5 , wherein the end effector assembly further includes a clip carrier disposed within the end effector assembly, wherein the clip carrier is configured to retain the surgical clips and the clip follower, wherein the lower tab of the clip follower engages features formed in the clip carrier.

7. The apparatus according to claim 6 , wherein the clip follower is incrementally advanced through the clip carrier.

8. The apparatus according to claim 1 , further comprising a housing rotatably supporting the shaft assembly, wherein the shaft assembly is rotatable about a longitudinal axis of the shaft assembly.

9. The apparatus according to claim 8 , wherein the housing supports an articulation dial, wherein the articulation dial is operatively connected to the neck assembly such that actuation of the articulation dial results in articulation of the neck assembly.

10. The apparatus according to claim 9 , further comprising a handle assembly supporting the shaft assembly.

11. The apparatus according to claim 10 , wherein the handle assembly comprises:

the housing;

a drive assembly;

a trigger operatively connected to the drive assembly; and

a drive block axially slidably supported in the housing, wherein the drive block is connected to the trigger and defines a helical lumen,

wherein the rotatable drive member is operatively connected to the trigger and to the end effector assembly, and

wherein actuation of the trigger results in the rotation of the drive member.

12. The apparatus according to claim 11 , wherein the rotatable drive member includes:

a handle drive screw threadably engaged with the helical lumen of the drive block; and

the end effector drive screw threadably engaged with the helical lumen of the drive sled,

wherein axial translation of the drive block relative to the handle drive screw of the handle assembly results in a rotation of the handle drive screw, and

wherein the rotation of the handle drive screw results in a rotation of the end effector drive screw and the axial translation of the drive sled.

13. The apparatus according to claim 12 , wherein the handle assembly includes:

an articulation screw rotatably supported in the handle assembly and being connected to the articulation dial, the articulation screw defining a pair of oppositely oriented grooves formed in a surface of the articulation screw; and

a pair of articulation actuators translatably slidably supported in the handle assembly,

wherein each articulation actuator is engaged with a respective groove of the articulation screw,

wherein a proximal end of an articulation cable is secured to a respective articulation actuator, and

wherein rotation of the articulation dial results in rotation of the articulation screw and opposed translation of the articulation actuators.

14. The apparatus according to claim 13 , wherein the handle assembly further includes a ratchet operatively engaged with the articulation dial.

15. The apparatus according to claim 1 , wherein the neck assembly includes a plurality of inter-connected articulation joints.

16. An apparatus for application of surgical clips to body tissue, the apparatus comprising:

a shaft assembly including:

an articulating neck assembly;

an end effector assembly supported on a distal end of the articulating neck assembly, the end effector assembly being configured to form a surgical clip in place on the body tissue, the end effector assembly including:

a drive sled slidably axially translatable within the end effector assembly, the drive sled defining a helical lumen;

at least one clip disposed in the end effector assembly;

jaws configured to receive and form the at least one clip;

a pusher bar configured to load the at least one clip into the jaws; and

a drive bar configured to selectively engage the pusher bar to effectuate a closure of the jaws; and

a rotatable drive member operatively connected to the end effector assembly, wherein a rotation of the drive member results in a loading of the at least one clip into the jaws and in a closing of the jaws,

wherein the rotatable drive member includes an end effector drive screw threadably engaged with the helical lumen of the drive sled,

wherein the drive bar is selectively engaged by the drive sled following a loading of a clip into the jaws by the pusher bar, and

wherein distal advancement of the drive sled distally advances the drive bar to effectuate the closure of the jaws.

17. The apparatus according to claim 16 , further comprising a handle assembly supporting the shaft assembly.

18. The apparatus according to claim 17 , wherein the handle assembly comprises:

a drive assembly;

a trigger operatively connected to the drive assembly; and

a housing and a drive block axially slidably supported in the housing, wherein the drive block is connected to the trigger and defines a helical lumen.

19. The apparatus according to claim 18 , wherein the rotatable drive member is operatively connected to the trigger and to the end effector, wherein actuation of the trigger results in the rotation of the drive member.

20. The apparatus according to claim 19 , wherein the rotatable drive member comprises:

a handle drive screw threadably engaged with the helical lumen of the drive block, and

the end effector drive screw threadably engaged with the helical lumen of the drive sled,

wherein axial translation of the drive block relative to the handle drive screw of the handle assembly results in a rotation of the handle drive screw, and

wherein the rotation of the handle drive screw results in a rotation of the end effector drive screw and the axial translation of the drive sled.