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A surgical instrument comprises a first elongated member and a second elongated member, the first elongated member and the second elongated member being operatively connected and configured to rotate in opposite directions to substantially limit counter torque. The first and second elongated members

A surgical instrument comprises a first elongated member and a second elongated member, the first elongated member and the second elongated member being operatively connected and configured to rotate in opposite directions to substantially limit counter torque. The first and second elongated members are flexible shafts. The surgical instrument can be configured to apply fasteners to a tissue portion. This embodiment of the surgical instrument includes a cartridge having a plurality of fasteners, an anvil, said anvil and cartridge being relatively movable between spaced and approximated positions, and a sled disposed in the cartridge. The sled includes a cam member. The cam member is designed to drive the fasteners through tissue and toward the anvil.

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1. A surgical instrument, comprising: an end effector; andfirst and second elongate shafts rotatably connected to each other at an end portion thereof such that rotation of one of the first and second elongate shafts causes rotation of the other elongate shaft to actuate the end effector, and wherei

1. A surgical instrument, comprising: an end effector; andfirst and second elongate shafts rotatably connected to each other at an end portion thereof such that rotation of one of the first and second elongate shafts causes rotation of the other elongate shaft to actuate the end effector, and wherein the first and second elongate shafts are movable axially relative to the end effector between a first position and a second position. 2. The surgical instrument according to claim 1, further comprising a gearshift lever configured to move the first and second elongate shafts longitudinally between the first and second positions. 3. The surgical instrument according to claim 2, wherein the first and second elongate shafts each include a gear at a respective proximal portion thereof, the gears being configured to mesh with each other such that rotation of one of the first and second elongate shafts causes rotation of the other elongate shaft. 4. The surgical instrument according to claim 3, further comprising first and second pinions, each pinion being operatively coupled to a distal portion of respective elongate shaft, wherein the pinions are configured to mesh with each other providing rotatable connection between the first and second elongate shafts. 5. The surgical instrument according to claim 2, wherein the end effector includes an anvil and a cartridge, the cartridge having a plurality of fasteners. 6. The surgical instrument according to claim 5, wherein when the elongate shafts are moved to the first position, rotation of the first and second elongate shafts moves the anvil and the cartridge between spaced and approximated positions. 7. The surgical instrument according to claim 5, wherein when the elongate shafts are in the second position, rotation of the first and second elongate shafts causes the plurality of fasteners to be ejected from the cartridge and toward the anvil. 8. The surgical instrument according to claim 5, further comprising a clamp cam, wherein movement of the clamp cam along a longitudinal axis of the surgical instrument causes relative motion between the anvil and the cartridge, the anvil and the cartridge being movable between spaced apart and approximated positions. 9. The surgical instrument according to claim 8, further comprising first and second members each including a clamp pinion rotatably connected to each other, the clamp pinions being configured to engage the pinions operatively coupled to the elongate shafts, wherein the clamp cam is translatably mounted on the first and second members such that rotation of the clamp pinions moves the clamp cam along the first and second members. 10. The surgical instrument according to claim 9, wherein when the elongate shafts are in the first position the pinions engage the clamp pinions, whereby the rotation of the first and second elongate shafts causes rotation of the clamp pinions which in turn moves the clamp cam along the first and second members. 11. The surgical instrument according to claim 9, wherein the first and second members are a lead screw. 12. The surgical instrument according to claim 5, wherein the end effector further includes at least one drive member adapted to axially move a sled disposed in the cartridge, the sled being adapted to drive the fasteners through tissue and toward the anvil. 13. The surgical instrument according to claim 12, wherein the at least one drive member is a lead screw. 14. The surgical instrument according to claim 12, wherein the at least one drive member includes at least one gear coupler configured to engage the pinions operatively coupled to the respective elongate shaft. 15. The surgical instrument according to claim 14, wherein when the elongate shafts are in the second position, the pinions engage the at least one gear coupler, whereby rotation of the first and second elongate shafts rotates the at least one gear coupler which in turn moves the sled. 16. The surgical instrument according to claim 2, further comprising a flexible neck attached to a proximal end of the end effector. 17. The surgical instrument according to claim 16, further comprising an articulation knob and at least one steering wire, the articulation knob being operatively coupled to the at least one steering wire, the at least one steering wire being coupled to the flexible neck such that rotation of the knob articulates the flexible neck. 18. The surgical instrument according to claim 1, wherein rotation of one of the first and second elongate shafts causes rotation of the other elongate shaft in an opposite direction to actuate the end effector. 19. The surgical instrument according to claim 1, wherein the first and second elongate shafts are flexible.