Hand-held surgical instruments

1. A hand-held surgical instrument, comprising:

a handle housing;

a motor disposed within the handle housing;

a shaft portion extending distally relative to the handle housing;

a firing shaft received within the shaft portion and operably coupled to the motor such that an activation of the motor translates the firing shaft within the shaft portion to fire staples from an end effector;

a lever mechanically coupled to the firing shaft via the shaft portion, wherein the firing shaft is configured to retract in response to a manual rotation of the lever;

a screw operably coupled to the motor; and

a nut non-rotationally supported in the shaft portion and threadedly coupled to the screw, the firing shaft having a proximal end portion attached to the nut, wherein the nut is configured to translate the firing shaft along a longitudinal axis defined by the shaft portion in response to a rotation of the screw.

2. The hand-held surgical instrument according to claim 1 , wherein the lever is operably coupled to the shaft portion, such that a rotation of the lever rotates the shaft portion, which in turn rotates the nut about the screw to retract the firing shaft relative to the shaft portion.

3. The hand-held surgical instrument according to claim 2 , wherein the lever has a distal end portion having a gear, and the shaft portion has a proximal end portion having a gear in meshing engagement with the gear of the lever.

4. The hand-held surgical instrument according to claim 3 , wherein the lever is rotationally supported in the handle housing and has a proximal end portion in the form of a crank.

5. The hand-held surgical instrument according to claim 2 , further comprising an I-beam having a proximal end portion engaged with a distal end portion of the firing shaft, and a distal end portion configured to fire the staples from the end effector, wherein the I-beam retracts in response to the retraction of the firing shaft to open jaw members of the end effector.

6. The hand-held surgical instrument according to claim 1 , wherein the lever is received in the handle housing.

7. The hand-held surgical instrument according to claim 6 , further comprising a cap detachably coupled to a proximal end portion of the handle housing, wherein the lever has a proximal end portion received in the cap.

8. The hand-held surgical instrument according to claim 7 , wherein the cap restricts rotational motion of the lever within the handle housing.

9. The hand-held surgical instrument according to claim 8 , wherein the lever has a proximal end portion in the form of a crank, the proximal end portion of the lever being keyed to the cap.

10. A hand-held surgical instrument, comprising:

a handle housing;

an outer tube extending distally relative to the handle housing and rotationally supported by the handle housing;

a screw;

a nut non-rotationally supported in the shaft portion and operably coupled to the screw; and

a firing shaft having a proximal end portion attached to the nut, the nut being configured to translate the firing shaft along a longitudinal axis defined by the outer tube in response to a rotation of the screw; and

a manual lever disposed in the handle housing and operably coupled to the outer tube, wherein the outer tube and the nut are configured to rotate together about the longitudinal axis in response to a manual actuation of the lever to retract the firing shaft.

11. The hand-held surgical instrument according to claim 10 , wherein the outer tube has a non-circular shape and the nut has a matching non-circular shape.

12. The hand-held surgical instrument according to claim 10 , wherein the outer tube has a D-shaped configuration and the nut has a matching D-shaped configuration.

13. The hand-held surgical instrument according to claim 10 , wherein the lever has a distal end portion having a gear, and the outer tube has a proximal end portion having a gear in meshing engagement with the gear of the lever.

14. The hand-held surgical instrument according to claim 10 , further comprising a cap coupled to a proximal end portion of the handle housing, wherein the lever has a proximal end portion covered by the cap.

15. The hand-held surgical instrument according to claim 14 , wherein the cap is engaged with the proximal end portion of the lever to restrict rotational motion of the lever.

16. The hand-held surgical instrument according to claim 15 , wherein the cap is configured to move relative to the proximal end portion of the handle housing to expose the proximal end portion of the lever and disengage the proximal end portion of the lever.

17. The hand-held surgical instrument according to claim 10 , wherein the lever includes:

an elongated bar extending through the handle housing;

a gear fixed to a distal end portion of the elongated bar and operably coupled to the outer tube; and

a crank fixed to a proximal end portion of the elongated bar and protruding from the handle housing.

18. The hand-held surgical instrument according to claim 10 , further comprising a motor disposed in the handle housing and drivingly coupled to the screw, wherein the motor is configured to rotate the screw relative to the nut and the outer tube to drive a translation of the nut and the firing shaft relative to the outer tube.

19. A surgical instrument, comprising:

a housing;

a shaft portion extending distally relative to the housing;

a screw;

a nut non-rotationally supported in the shaft portion and operably coupled to the screw;

a firing shaft received within the shaft portion and axially fixed relative to the nut such that the nut is configured to translate the firing shaft along a longitudinal axis defined by the shaft portion in response to a rotation of the screw; and

a lever mechanically coupled to the shaft portion such that a rotation of the lever rotates the shaft portion about the longitudinal axis, wherein the firing shaft is configured to retract in response to the rotation of the lever.

20. The surgical instrument according to claim 19 , further comprising a cap removably attached to the housing and covering a crank portion of the lever, wherein the cap is engaged to the lever thereby preventing the rotation of the lever until the cap is detached from the housing.