A surgical instrument comprising: (a) a body; (b) a shaft assembly extending distally from the body along a longitudinal axis, wherein the shaft assembly is rotatable relative to the body about the longitudinal axis; (c) an end effector arranged at a distal end of the shaft assembly, wherein the end effector includes an RF electrode operable to seal tissue with RF energy, wherein the end effector further comprises an ultrasonic blade operable to treat tissue with ultrasonic energy, and a clamp arm moveable relative to the ultrasonic blade to clamp tissue therebetween, wherein one of the clamp arm or the ultrasonic blade provides the RF electrode; and (d) an electrical contact assembly arranged proximally of the end effector, wherein the electrical contact assembly is configured to electrically couple the RF electrode with an RF energy source, wherein the electrical contact assembly comprises: (i) a first electrical contact secured to the body, wherein the first electrical contact is configured to electrically couple with the RF energy source, and (ii) a second electrical contact secured to the shaft assembly, wherein the second electrical contact is electrically coupled with the RF electrode and with the first electrical contact, wherein the second electrical contact is configured to rotate with the shaft assembly relative to the body and the first electrical contact, wherein the first and second electrical contacts are configured to remain electrically coupled together throughout rotation of the shaft assembly relative to the body, wherein the first electrical contact comprises an outer contact that includes a contact arm and the second electrical contact comprises an inner contact, wherein the inner contact comprises an inner ring contact that encircles an outer tube of the shaft assembly, and wherein the contact arm is configured to directly contact and maintain electrical engagement with the inner ring contact throughout rotation of the shaft assembly relative to the body. (a) a body; (b) a shaft assembly extending distally from the body along a longitudinal axis, wherein the shaft assembly is rotatable relative to the body about the longitudinal axis; (c) an end effector arranged at a distal end of the shaft assembly, wherein the end effector includes an RF electrode operable to seal tissue with RF energy, wherein the end effector further comprises an ultrasonic blade operable to treat tissue with ultrasonic energy, and a clamp arm moveable relative to the ultrasonic blade to clamp tissue therebetween, wherein one of the clamp arm or the ultrasonic blade provides the RF electrode; and (d) an electrical contact assembly arranged proximally of the end effector, wherein the electrical contact assembly is configured to electrically couple the RF electrode with an RF energy source, wherein the electrical contact assembly comprises: (i) a first electrical contact secured to the body, wherein the first electrical contact is configured to electrically couple with the RF energy source, and (ii) a second electrical contact secured to the shaft assembly, wherein the second electrical contact is electrically coupled with the RF electrode and with the first electrical contact, wherein the second electrical contact is configured to rotate with the shaft assembly relative to the body and the first electrical contact, wherein the first and second electrical contacts are configured to remain electrically coupled together throughout rotation of the shaft assembly relative to the body, wherein the first electrical contact comprises an outer contact that includes a contact arm and the second electrical contact comprises an inner contact, wherein the inner contact comprises an inner ring contact that encircles an outer tube of the shaft assembly, and wherein the contact arm is configured to directly contact and maintain electrical engagement with the inner ring contact throughout rotation of the shaft assembly relative to the body. (i) a first electrical contact secured to the body, wherein the first electrical contact is configured to electrically couple with the RF energy source, and (ii) a second electrical contact secured to the shaft assembly, wherein the second electrical contact is electrically coupled with the RF electrode and with the first electrical contact, wherein the second electrical contact is configured to rotate with the shaft assembly relative to the body and the first electrical contact,