Reverse loading surgical clip applier

1. An end effector for a surgical clip applier, comprising:

a body having a proximal end and a distal end;

a head arranged at the distal end;

first and second jaw members mounted to the head; and

a linear actuator arranged within the head and operable to collapse and open the first and second jaw members, the linear actuator including:

a jaw pulley;

a drive cable routed around the jaw pulley to cause rotation of the jaw pulley;

a bevel gear assembly operatively coupled to the jaw pulley; and

a threaded linear drive operatively coupled to the bevel gear assembly,

wherein rotation of the jaw pulley causes actuation of the bevel gear assembly, which actuates the threaded linear drive and thereby operates to collapse or open the first and second jaw members.

2. The end effector of claim 1 , wherein the threaded linear drive comprises a threaded gear plate providing female threading, and wherein the bevel gear assembly comprises:

a drive gear rotated by the jaw pulley;

a driven gear intermeshed with the drive gear; and

a worm gear extending from the driven gear and defining helical threading threadably matable with the female threading of the threaded gear plate.

3. The end effector of claim 1 , further comprising:

a first angled slot defined in the first jaw member and extending at a positive angle relative to a longitudinal axis of the end effector;

a second angled slot defined in the second jaw member and extending at a negative angle relative to the longitudinal axis, wherein the negative angle is of a same magnitude as the positive angle; and

a transition pin that extends from a gear plate of the linear actuator and through the first and second angled slots,

wherein actuation of the linear actuator moves the gear plate in a linear direction and correspondingly moves the transition pin to slidingly engage the first and second angled slots and thereby urge the first and second jaw members laterally with respect to each other.

4. The end effector of claim 1 , wherein the first and second jaw members comprise independent structures laterally movable relative to one another, and wherein opposing inner surfaces defined on the first and second jaw members remain parallel to each other as the first and second jaw members laterally move relative to one another.

5. The end effector of claim 1 , further comprising a clip cartridge coupled to the body and containing one or more surgical clips, each surgical clip having a crown and a pair of legs extending from the crown, wherein the one or more surgical clips are arranged within the clip cartridge with the crown leading and the pair of legs extending proximally therefrom.

6. The end effector of claim 5 , wherein the first and second jaw members are alignable with the clip cartridge to receive a distal-most surgical clip of the one or more surgical clips, and wherein the distal-most surgical clip is fed crown first into the first and second jaw members from the clip cartridge.

7. The end effector of claim 5 , further comprising a groove defined in an inner surface of each of the first and second jaw members, wherein the groove of each jaw member is aligned with the distal-most surgical clip.

8. An end effector for a surgical clip applier, comprising:

a body having a proximal end and a distal end;

a clip cartridge coupled to the body and containing one or more surgical clips, each surgical clip having a crown and a pair of legs extending from the crown;

a head arranged at the distal end; and

first and second jaw members mounted to the head, wherein the first and second jaw members are alignable with the clip cartridge to receive a distal-most surgical clip of the one or more surgical clips, and

wherein the distal-most surgical clip is fed crown first into the first and second jaw members from the clip cartridge.

9. The end effector of claim 8 , wherein the one or more surgical clips are arranged within the clip cartridge with the crown leading and the pair of legs extending proximally therefrom.

10. The end effector of claim 8 , further comprising a clip pusher configured to apply an axial load on the one or more surgical clips to position the distal-most surgical clip between the first and second jaw members.

11. The end effector of claim 8 , wherein the clip cartridge is removably coupled to the body.

12. The end effector of claim 11 , further comprising:

a first angled slot defined in the first jaw member and extending at a positive angle relative to a longitudinal axis of the end effector;

a second angled slot defined in the second jaw member and extending at a negative angle relative to the longitudinal axis, wherein the negative angle is of a same magnitude as the positive angle; and

a transition pin that extends from a gear plate of the linear actuator and through the first and second angled slots,

wherein actuation of the linear actuator moves the gear plate in a linear direction and correspondingly moves the transition pin to slidingly engage the first and second angled slots and thereby urge the first and second jaw members laterally with respect to each other.

13. The end effector of claim 8 , further comprising a linear actuator operable to collapse and open the first and second jaw members, the linear actuator including:

a jaw pulley;

a drive cable routed around the jaw pulley to cause rotation of the jaw pulley;

a bevel gear assembly operatively coupled to the jaw pulley; and

a threaded linear drive operatively coupled to the bevel gear assembly,

wherein rotation of the jaw pulley causes actuation of the bevel gear assembly, which actuates the threaded linear drive and thereby operates to collapse or open the first and second jaw members.

14. The end effector of claim 8 , wherein the first and second jaw members comprise independent structures movable laterally relative to one another, and wherein opposing inner surfaces defined on the first and second jaw members remain parallel to each other as the first and second jaw members open or close.

15. A surgical clip applier, comprising:

a drive housing;

an elongate shaft that extends from the drive housing; and

an end effector arranged at a distal end of the elongate shaft, the end effector including:

a body having a proximal end and a distal end;

a head arranged at the distal end;

first and second jaw members mounted to the head; and

a linear actuator arranged within the head and operable to collapse and open the first and second jaw members, the linear actuator including a jaw pulley about which the drive cable is routed to cause rotation of the jaw pulley, a bevel gear assembly operatively coupled to the jaw pulley, and a threaded linear drive operatively coupled to the bevel gear assembly; and

a drive cable extending from the drive housing to the end effector and actuatable to operate the linear actuator,

wherein rotation of the jaw pulley causes actuation of the bevel gear assembly, which actuates the threaded linear drive and thereby collapses or opens the first and second jaw members.

16. The surgical clip applier of claim 15 , wherein the first and second jaw members comprise independent structures laterally movable relative to one another, and wherein opposing inner surfaces defined on the first and second jaw members remain parallel to each other as the first and second jaw members laterally move relative to one another.

17. The surgical clip applier of claim 15 , further comprising a clip cartridge coupled to the body and containing one or more surgical clips, each surgical clip having a crown and a pair of legs extending from the crown, wherein the one or more surgical clips are arranged within the clip cartridge with the crown leading and the pair of legs extending proximally therefrom.

18. The surgical clip applier of claim 17 , wherein a distal-most surgical clip of the one or more surgical clips is fed crown first into the first and second jaw members from the clip cartridge.