Methods and devices for controlling motorized surgical devices

1. A surgical device, comprising:

a proximal handle portion;

a shaft extending distally from the handle portion;

an end effector at a distal end of the shaft, the end effector being configured to engage tissue;

an actuator configured to be actuated so as to cause the end effector to move relative to the shaft;

a generator;

a cord attached to and extending from the proximal handle portion, the cord being configured to operatively couple to the generator configured to provide power to the surgical device when the cord is coupled thereto;

a controller configured to receive a recognition signal from the generator that indicates that the cord is operatively coupled thereto, wherein the controller is configured to, in response to receiving the recognition signal, initialize a sensor that is operatively coupled to a cutting element configured to move longitudinally through the end effector; and

a power source on the cord and external to the proximal handle portion.

2. The device of claim 1 , wherein the power is provided by the generator in response to the actuation of the actuator.

3. The device of claim 2 , wherein the power provided by the generator provides all the power necessary to move the end effector relative to the shaft in response to the actuation of the actuator.

4. The device of claim 2 , wherein the power provided by the generator provides a first partial portion of the power necessary to move the end effector relative to the shaft in response to the actuation of the actuator, a second partial portion of the power necessary to move the end effector relative to the shaft in response to the actuation of the actuator being manual power provided by a user.

5. The device of claim 1 , wherein the power source is removably and replaceably attachable to the cord.

6. The device of claim 1 , further comprising a power source housing fixedly attached to the cord, the power source being configured to be removably and replaceably disposed in the power source housing.

7. The device of claim 1 , wherein the power source comprises a battery.

8. The device of claim 1 , wherein the cord has a first end attached to the proximal handle portion and a second end configured to removably and replaceably attach to the generator, the power source being on the cord proximate the second end.

9. The device of claim 1 , wherein the cutting element is configured to move longitudinally through the end effector from a start position to an end position, the generator being configured to provide at least a portion of power that causes the movement of the cutting element from the start position to the end position.

10. The device of claim 9 , wherein the sensor is configured to sense a position of the cutting element relative to the end effector.

11. The device of claim 10 , wherein the controller is configured to adjust the power provided by the generator during the movement of the cutting element based at least in part on the sensed position of the cutting element relative to the end effector.

12. A surgical system, comprising:

a handheld surgical device that includes a proximal handle portion and a distal end effector configured to engage tissue;

a motor configured to provide an output that causes the distal end effector to move relative to the proximal handle portion;

a wire extending outside the proximal handle portion and being configured to be selectively attached to and detached from the motor by being reattachable thereto; and

a non-rechargeable power source attached to the wire at a location outside the proximal handle portion and being configured to provide power to the motor when the wire is attached to the motor, the power provided to the motor allowing the motor to provide the output;

wherein the wire has a first end attached to the handheld surgical device and a second end configured to be selectively attached to and detached from the motor by being reattachable thereto, the power source being adjacent to the second end.

13. The system of claim 12 , further comprising a power source housing fixedly attached to the wire, the power source being configured to be removably and replaceably disposed in the power source housing.

14. The system of claim 12 , further comprising a cutting element configured to move longitudinally through the distal end effector, the motor being configured to provide power that causes the movement of the cutting element.

15. The system of claim 12 , wherein the end effector comprises first and second jaws configured to move between an open position and a closed position, the motor being configured to provide power that causes the movement between the open and closed positions.

16. The system of claim 12 , wherein the motor is located entirely outside the proximal handle portion.

17. A surgical system, comprising:

a handheld surgical device that includes a proximal handle portion and a distal end effector configured to engage tissue;

a motor configured to provide an output that causes the distal end effector to move relative to the proximal handle portion;

a wire extending outside the proximal handle portion and being configured to be selectively attached to and detached from the motor by being reattachable thereto;

a non-rechargeable power source attached to the wire at a location outside the proximal handle portion and being configured to provide power to the motor when the wire is attached to the motor, the power provided to the motor allowing the motor to provide the output;

a cutting element configured to move longitudinally through the distal end effector, the motor being configured to provide power that causes the movement of the cutting element; and

a controller configured to, in response to the wire being attached to the motor, trigger sensing of an initial position of the cutting element.