Control systems for ultrasonically powered surgical instruments

1. A method for controlling a surgical instrument, the surgical instrument comprising: an ultrasonic transducer; a blade extending distally from the ultrasonic transducer along a longitudinal axis; a sheath positioned at least partially around the blade and extending distally along the longitudinal axis; and a motor coupled to the ultrasonic transducer to rotate the ultrasonic transducer and the blade about the longitudinal axis, the method comprising:

receiving an indication to operate the surgical instrument according to an ultrasonic-only mode;

after receiving the indication to operate the surgical instrument according to the ultrasonic-only mode:

instructing the motor to rotate the blade to a park position; and

activating the ultrasonic transducer to longitudinally vibrate the blade;

receiving an indication to operate the surgical instrument according to an injection mode, wherein the blade comprises a medicament passage extending proximally from a first end at a distal portion of the blade;

after receiving the indication to operate the surgical instrument according to the injection mode:

instructing the motor to rotate the blade to a position in which the first end of the medicament passage is exposed through a distally-positioned opening of the sheath; and

instructing a pump to inject medicament through the medicament passage;

receiving an indication to operate the surgical instrument according to a rotation mode; and

after receiving the indication to operate the surgical instrument according to the rotation mode, instructing the motor to provide gross rotational motion to the ultrasonic transducer and the blade.

2. A method for controlling a surgical instrument, the surgical instrument comprising: an ultrasonic transducer; a blade extending distally from the ultrasonic transducer along a longitudinal axis; and a motor coupled to the ultrasonic transducer to rotate the ultrasonic transducer and the blade about the longitudinal axis, the method comprising:

receiving an indication to operate the surgical instrument according to an ultrasonic-only mode;

instructing the motor to rotate the blade to a park position;

activating the ultrasonic transducer to longitudinally vibrate the blade; and

wherein the surgical instrument further comprises a sheath extending distally along the longitudinal axis, wherein the sheath is positioned at least partially around the blade, and wherein the sheath defines a distally-positioned opening exposing at least a portion of the blade; and

wherein the blade has a concave side and a non-concave side, and wherein instructing the motor to rotate the blade to the park position comprises instructing the motor to rotate the blade to a position in which the non-concave side is exposed at the distally-positioned opening.

3. The method of claim 2 , wherein receiving the indication to operate the surgical instrument according to the ultrasonic-only mode comprises receiving an indication that a control switch arrangement of the surgical instrument is configured to select the ultrasonic-only mode.

4. The method of claim 2 , further comprising, before activating the ultrasonic transducer, receiving an indication to activate the ultrasonic transducer, wherein the indication to activate the ultrasonic transducer is distinct from the indication to operate the surgical instrument according to the ultrasonic-only mode.

5. The method of claim 2 , wherein receiving the indication to operate the surgical instrument according to the ultrasonic-only mode comprises receiving an indication of a position of at least one switch.

6. The method of claim 2 , further comprising:

receiving an indication to operate the surgical instrument according to a rotation mode; and

instructing the motor to provide gross rotational motion to the ultrasonic transducer and the blade.

7. A method for controlling a surgical instrument, the surgical instrument comprising: an ultrasonic transducer; a blade extending distally from the ultrasonic transducer along a longitudinal axis; and a motor coupled to the ultrasonic transducer to rotate the ultrasonic transducer and the blade about the longitudinal axis, the method comprising:

receiving an indication to operate the surgical instrument according to an ultrasonic-only mode;

instructing the motor to rotate the blade to a park position;

activating the ultrasonic transducer to longitudinally vibrate the blade;

wherein the surgical instrument further comprises a sheath extending distally along the longitudinal axis, wherein the sheath is positioned at least partially around the blade, and wherein the sheath defines a distally-positioned opening exposing at least a portion of the blade; and

wherein the blade comprises a medicament passage extending proximally from a first end at a distal portion of the blade, the method further comprising:

receiving an indication to operate the surgical instrument according to an injection mode; and

instructing the motor to rotate the blade to a position in which the first end of the medicament passage is exposed at the distally-positioned opening.

8. A method for controlling a surgical instrument, the surgical instrument comprising: an ultrasonic transducer; a blade extending distally from the ultrasonic transducer along a longitudinal axis; and a motor coupled to the ultrasonic transducer to rotate the ultrasonic transducer and the blade about the longitudinal axis, the method comprising:

receiving an indication to operate the surgical instrument according to an ultrasonic-only mode;

instructing the motor to rotate the blade to a park position;

activating the ultrasonic transducer to longitudinally vibrate the blade;

receiving an indication to operate the surgical instrument according to a dual mode;

instructing the motor to provide gross rotational motion to the ultrasonic transducer; and

activating the ultrasonic transducer to longitudinally vibrate the blade.