Dual purpose surgical instrument for cutting and coagulating tissue

1. An ultrasonic surgical instrument, comprising:

a housing;

a motor assembly supported by the housing;

a cutting blade, wherein a proximal end of the cutting blade is configured to be removably coupled to the motor assembly;

an ultrasonic transducer assembly supported by the housing;

an ultrasonic blade, wherein a proximal end of the ultrasonic blade is configured to be removably coupled to the ultrasonic transducer assembly; and

an outer sheath configured to support the cutting blade and the ultrasonic blade, wherein a proximal end of the outer sheath is configured to be removably coupled to the housing.

2. The ultrasonic surgical instrument of claim 1 , wherein the outer sheath defines a longitudinally extending lumen, the longitudinally extending lumen configured to receive the cutting blade.

3. The ultrasonic surgical instrument of claim 2 , wherein the outer sheath further defines a distal aperture, the distal aperture configured to expose at least a portion of a distal end of the cutting blade.

4. The ultrasonic surgical instrument of claim 3 , wherein the distal end of the cutting blade is configured to cut tissue.

5. The ultrasonic surgical instrument of claim 1 , wherein the outer sheath defines a longitudinally extending lumen, the longitudinally extending lumen configured to receive the ultrasonic blade.

6. The ultrasonic surgical instrument of claim 5 , wherein the outer sheath further defines a distal aperture, the distal aperture positioned for a distal portion of the ultrasonic blade to protrude from the outer sheath.

7. The ultrasonic surgical instrument of claim 1 , wherein the proximal end of the ultrasonic blade defines threads to removably couple the ultrasonic blade to the ultrasonic transducer assembly.

8. The ultrasonic surgical instrument of claim 1 , wherein the housing defines a suction chamber fluidically coupled to a suction port, wherein the cutting blade defines a suction lumen extending between the proximal end and an opening at a distal end of the cutting blade, and wherein the cutting blade further defines a suction aperture at a proximal portion of the cutting blade to fluidically couple the suction lumen to the suction chamber.

9. The ultrasonic surgical instrument of claim 1 , wherein the motor assembly comprises a drive shaft, wherein a first coupling portion is positioned at a distal end of the drive shaft, wherein the proximal end of the cutting blade comprises a second coupling portion, and wherein the second coupling portion is configured to engage the first coupling portion to couple the cutting blade to the motor assembly.

10. An ultrasonic surgical instrument, comprising:

a housing;

a motor assembly contained within the housing;

a cutting blade, wherein a proximal end of the cutting blade is configured to be detachable from and reattachable to the motor assembly;

an ultrasonic transducer assembly contained within the housing;

an ultrasonic blade coupled to and extending distally from the ultrasonic transducer assembly; and

an outer sheath, wherein a proximal end of the outer sheath is configured to be detachable from and reattachable to the housing, and wherein the outer sheath:

defines a first longitudinally extending lumen configured to rotatably support the cutting blade; and

defines a second longitudinally extending lumen configured to support axial motion of the ultrasonic blade.

11. The ultrasonic surgical instrument of claim 10 , wherein the outer sheath further defines a first distal aperture, the first distal aperture configured to expose at least a portion of a distal end of the cutting blade.

12. The ultrasonic surgical instrument of claim 11 , wherein the distal end of the cutting blade is configured to cut tissue.

13. The ultrasonic surgical instrument of claim 11 , wherein the outer sheath further defines a second distal aperture, the second distal aperture positioned for a distal portion of the ultrasonic blade to protrude from the outer sheath.

14. The ultrasonic surgical instrument of claim 10 , wherein the housing defines a suction chamber, wherein the cutting blade defines a suction lumen extending within the cutting blade between the proximal end and an opening at a distal end of the cutting blade, and wherein the cutting blade further defines an aperture at a proximal portion of the cutting blade to fluidically couple the suction lumen to the suction chamber.

15. The ultrasonic surgical instrument of claim 10 , wherein the proximal end of the cutting blade comprises a portion of a coupling arrangement configured such that the cutting blade is detachable from and reattachable to the motor assembly.

16. An ultrasonic surgical instrument, comprising:

a housing, comprising:

a motor assembly; and

an ultrasonic transducer assembly;

an ultrasonic blade, wherein a proximal end of the ultrasonic blade is configured to be removably attached to the ultrasonic transducer assembly; and

an outer sheath assembly, comprising:

a cutting blade, wherein a proximal end of the cutting blade is configured to be removably attached to the motor assembly; and

an outer sheath, wherein a proximal end of the outer sheath is configured to be removably attached to the housing, and wherein the outer sheath:

defines a first axial lumen configured to support the cutting blade; and

defines a second axial lumen configured to receive the ultrasonic blade.

17. The ultrasonic surgical instrument of claim 16 , wherein the outer sheath further defines a first distal aperture, the first distal aperture configured to expose at least a portion of a distal end of the cutting blade.

18. The ultrasonic surgical instrument of claim 17 , wherein the distal end of the cutting blade is configured to cut tissue.

19. The ultrasonic surgical instrument of claim 17 , wherein the outer sheath further defines a second distal aperture, the second distal aperture positioned for a distal portion of the ultrasonic blade to protrude from a distal portion of the outer sheath.

20. The ultrasonic surgical instrument of claim 16 , wherein the housing defines a suction chamber, wherein the cutting blade defines an axial suction lumen fluidically coupled with an opening at a distal end of the cutting blade, and wherein the cutting blade further defines an aperture at a proximal portion of the cutting blade to fluidically couple the axial suction lumen to the suction chamber within the housing.