Surgical instruments having a rotatable blade member for treating tissue

A hand-held surgical instrument, comprising:

• a handle assembly including:
• a handle housing;
• a drive motor disposed within the handle housing;
• an articulation switch movably coupled to the handle housing;
• and
• a trigger movably coupled to the handle housing;
• an elongated shaft having a proximal end portion coupled to the handle housing, and a distal end portion configured to articulate relative to the proximal end portion in response to an actuation of the articulation switch;
• a drive shaft extending longitudinally along the elongated shaft and configured to rotate about a longitudinal axis defined by the drive shaft, the drive shaft having a proximal end portion operably coupled to the drive motor;
• and
• an end effector assembly coupled to the distal end portion of the elongated shaft and including:
• a jaw member pivotable relative to the distal end portion of the elongated shaft;
• and
• a blade member opposing the jaw member, wherein the blade member is coupled to a distal end portion of the drive shaft, such that the blade member is configured to rotate in response to an actuation of the trigger to treat tissue disposed between the jaw member and the blade member.

A surgical instrument for treating tissue, comprising:

• an elongated shaft;
• a tubular shaft extending through the elongated shaft and defining a lumen configured to receive a fluid;
• and
• a blade member coupled to a distal end portion of the tubular shaft and defining an internal chamber in fluid communication with the lumen, wherein the blade member has a plurality of vanes, such that the blade member is configured to rotate relative to the tubular shaft in response to the fluid moving over the plurality of vanes.