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A surgical instrument includes a handle portion and a body portion extending distally from the handle portion and defining a first longitudinal axis. The surgical instrument includes an articulating tool assembly defining a second longitudinal axis and having a proximal end. The articulating tool as

A surgical instrument includes a handle portion and a body portion extending distally from the handle portion and defining a first longitudinal axis. The surgical instrument includes an articulating tool assembly defining a second longitudinal axis and having a proximal end. The articulating tool assembly is disposed at a distal end of the body portion and is configured to be articulated with respect to the body portion, namely, the articulating tool assembly is movable from a first position in which the second longitudinal axis is substantially aligned with the first longitudinal axis to at least a second position in which the second longitudinal axis is disposed at an angle with respect to the first longitudinal axis. The surgical instrument also includes an articulation mechanism configured to articulate the articulating tool assembly.

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1. A powered surgical instrument comprising: a handle portion;a body portion extending distally from the handle portion and defining a first longitudinal axis;an articulating tool assembly defining a second longitudinal axis and having a proximal end, the articulating tool assembly disposed at a dis

1. A powered surgical instrument comprising: a handle portion;a body portion extending distally from the handle portion and defining a first longitudinal axis;an articulating tool assembly defining a second longitudinal axis and having a proximal end, the articulating tool assembly disposed at a distal end of the body portion and being movable from a first position in which the second longitudinal axis is aligned with the first longitudinal axis to at least a second position in which the second longitudinal axis is disposed at an angle with respect to the first longitudinal axis; andan articulation mechanism configured to articulate the articulating tool assembly, wherein the articulation mechanism includes: a motor operatively coupled to the articulating tool assembly;a controller electrically coupled to the motor and configured to control operation of the motor; anda first switch and a second switch, the first and second switches being coupled to the controller, wherein a rotation of the first switch and the second switch in a same rotational direction signals the controller to activate the articulation mechanism. 2. The powered surgical instrument according to claim 1, wherein the first and second switches are configured to be rotated in a direction corresponding to a desired articulation direction of the articulating tool assembly to activate the articulation mechanism. 3. The powered surgical instrument according to claim 1, wherein the first and second switches are configured to be rotated concurrently to activate the articulation mechanism. 4. The powered surgical instrument according to claim 1, wherein the articulation mechanism further includes a stop switch configured to disable the articulation mechanism. 5. The powered surgical instrument according to claim 1, wherein the controller is configured to activate the articulation mechanism in response to a first command and to interrupt activation of the articulation mechanism in response to a second command. 6. The powered surgical instrument according to claim 1, wherein the articulation mechanism further includes a lock-out sensor electrically coupled to the controller and configured to determine engagement of the articulating tool assembly with tissue, wherein the lock-out sensor prevents activation of the articulation mechanism. 7. An articulation mechanism configured to articulate an articulating tool assembly, the articulation mechanism comprising: a motor configured to be operatively coupled to an articulating tool assembly;a controller electrically coupled to the motor and configured to control operation of the motor; anda first switch and a second switch, the first and second switches being coupled to the controller, wherein the controller activates the articulation mechanism in response to the first and second switches being rotated in a same rotational direction. 8. The articulation mechanism according to claim 7, wherein the first switch and the second switch are configured to be rotated in a direction corresponding to a desired articulation direction of the articulating tool assembly to activate the articulation mechanism. 9. The articulation mechanism according to claim 7, further comprising a stop switch configured to disable the articulation mechanism. 10. The articulation mechanism according to claim 7, wherein the controller is configured to activate the articulation mechanism in response to a first command and to interrupt activation of the articulation mechanism in response to a second command. 11. The articulation mechanism according to claim 7, further comprising: a lock-out sensor electrically coupled to the controller and configured to determine engagement of the articulating tool assembly with tissue, wherein the lock-out sensor prevents activation of the articulation mechanism. 12. An articulation mechanism configured to articulate an articulating tool assembly, the articulation mechanism comprising: a motor configured to be operatively coupled to an articulating tool assembly;a controller electrically coupled to the motor and configured to control operation of the motor; anda first switch and a second switch, the first and second switches being coupled to the controller, wherein the controller activates the articulation mechanism in response to the first switch being moved in a proximal direction and the second switch being moved in a distal direction. 13. The articulation mechanism according to claim 12, wherein the first switch and the second switch are configured to be moved in a direction corresponding to a desired articulation direction of the articulating tool assembly to activate the articulation mechanism. 14. The articulation mechanism according to claim 12, further comprising a stop switch configured to disable the articulation mechanism. 15. The articulation mechanism according to claim 12, wherein the controller is configured to activate the articulation mechanism in response to a first command and to interrupt activation of the articulation mechanism in response to a second command. 16. The articulation mechanism according to claim 12, further comprising: a lock-out sensor electrically coupled to the controller and configured to determine engagement of the articulating tool assembly with tissue, wherein the lock-out sensor prevents activation of the articulation mechanism. 17. The powered surgical instrument according to claim 1, wherein the first and second switches are independently movable relative to one another. 18. The articulation mechanism according to claim 7, wherein the first and second switches are independently movable relative to one another. 19. The articulation mechanism according to claim 12, wherein the first and second switches are independently movable relative to one another.