Powered surgical tack applier

1. A powered surgical tack applier comprising:

a handle assembly including:

an actuation assembly including an actuation rod and an actuation switch; and

an articulation lever assembly including an articulation rod and an articulation lever operatively coupled with the articulation rod;

an elongate member extending distally from the handle assembly, the elongate member including:

a loading unit having a plurality of surgical tacks, the loading unit operatively coupled to the actuation rod of the actuation assembly such that rotation of the actuation rod deploys a surgical tack of the plurality of surgical tacks from the loading unit; and

an articulation portion pivotable with respect to a longitudinal axis defined by the elongate member, the articulation portion being operatively coupled to the articulation rod of the handle assembly such that axial displacement of the articulation rod articulates the articulation portion; and

a power module removably received in the handle assembly, the power module including:

a motor operatively coupled to the actuation rod of the actuation assembly to rotate the actuation rod;

a battery electrically coupled to the motor to supply power to the motor; and

a gear box including:

a main sun gear fixed to an output shaft of the motor for concomitant rotation with the output shaft;

a first planetary gear assembly operably coupled to the main sun gear such that the first planetary gear assembly rotates about a longitudinal axis defined by the output shaft in response to rotation of the main sun gear;

a second planetary gear assembly operably coupled to the first planetary gear assembly such that the second planetary gear assembly rotates in response to the rotation of the first planetary gear assembly;

a drive shaft coupled to the second planetary gear assembly such that the drive shaft rotates with the second planetary gear assembly;

a third planetary gear assembly operably coupled to the second planetary gear assembly such that the third planetary gear assembly rotates in response to the rotation of the second planetary gear assembly;

a fourth planetary gear assembly operably coupled to the third planetary gear assembly such that the fourth planetary gear assembly rotates in response to the rotation of the third planetary gear assembly; and

a high-speed output coupled to the drive shaft for concomitant rotation therewith, the high-speed output operably coupled to the actuation rod of the handle assembly.

2. The powered surgical tack applier according to claim 1 , wherein the gear box of the power module further includes a high-torque output being non-rotatably coupled to the fourth planetary gear assembly such that the high-torque output rotates with the fourth planetary gear assembly.

3. The powered surgical tack applier according to claim 2 , wherein the high-speed output is concentrically disposed within the high-torque output.

4. The powered surgical tack applier according to claim 2 , wherein the high-speed and high-torque outputs are simultaneously rotatable in response to activation of the motor.

5. The powered surgical tack applier according to claim 2 , wherein the drive shaft has a proximal end portion fixed to the second planetary gear assembly, and a distal end portion rotatable relative to the high-torque output within the high-torque output.

6. The powered surgical tack applier according to claim 2 , wherein the high-torque output defines a cavity dimensioned to receive the high-speed output therein.

7. The powered surgical tack applier according to claim 1 , wherein the drive shaft extends longitudinally through the third and fourth planetary gear assemblies.

8. The powered surgical tack applier according to claim 1 , wherein the actuation assembly further includes a processor configured to control the motor.

9. The powered surgical tack applier according to claim 1 , wherein the actuation assembly further includes an optical motor encoder configured to count number of turns of the output shaft of the motor to ensure a desired number of turns are made to insert a surgical tack into tissue, the optical motor encoder operatively connected to the actuation rod and the processor.

10. The powered surgical tack applier according to claim 9 , wherein the actuation assembly further includes an encoder wheel configured to ensure correct clocking of a distal end of the actuation rod relative to the loading unit.

11. The powered surgical tack applier according to claim 1 , wherein the gear box of the power module further includes an elongate ring gear in engagement with the first, second, third and fourth planetary gear assemblies.

12. The powered surgical tack applier according to claim 11 , wherein the first, second, third, and fourth planetary gear assemblies are disposed within the elongate ring gear.

13. The powered surgical tack applier according to claim 11 , wherein the elongate ring gear is rotationally fixed relative to the motor.

14. A powered surgical tack applier comprising:

a handle assembly including:

an actuation assembly including an actuation rod; and

an articulation lever assembly including an articulation rod and an articulation lever operatively coupled with the articulation rod;

an elongate member extending distally from the handle assembly, the elongate member including:

a loading unit having a plurality of surgical tacks, the loading unit operatively coupled to the actuation rod of the actuation assembly such that rotation of the actuation rod deploys a surgical tack of the plurality of surgical tacks from the loading unit; and

an articulation portion pivotable with respect to a longitudinal axis defined by the elongate member, the articulation portion being operatively coupled to the articulation rod of the handle assembly such that axial displacement of the articulation rod articulates the articulation portion;

a power module removably received in the handle assembly, the power module including:

a motor having an output shaft;

a main sun gear fixed to the output shaft and configured to rotate with the output shaft;

a first planetary gear assembly operably coupled to the main sun gear such that the first planetary gear assembly rotates about the longitudinal axis in response to a rotation of the main sun gear;

a second planetary gear assembly operably coupled to the first planetary gear assembly such that the second planetary gear assembly rotates in response to the rotation of the first planetary gear assembly;

a drive shaft having a proximal end portion coupled to the second planetary gear assembly for concomitant rotation therewith;

a high-speed output configured to rotate the actuation rod, the high-speed output coupled to the drive shaft for concomitant rotation therewith; and

a high-torque output configured to be operably coupled to a driven member of a surgical end effector, the high-torque output being operably coupled to the motor.

15. The powered surgical tack applier according to claim 14 , wherein the high-speed output is concentrically disposed within the high-torque output.

16. The powered surgical tack applier according to claim 15 , wherein the distal end portion of the drive shaft is disposed within and rotatable relative to the high-torque output.

17. The powered surgical tack applier according to claim 16 , wherein the high-torque output defines a cavity therein, and the high-speed output is received in the cavity.

18. The powered surgical tack applier according to claim 14 , wherein the gear box of the power module further includes a biasing member captured between the high-speed output and an inner surface of the high-torque output, wherein the biasing member is configured to distally-bias the high-speed output.