Inductive power joint allowing unrestricted rotation

A method of using a medical apparatus comprising:

• inserting an electrosurgical device into a body, the electrosurgical device including a handle endpiece, the handle endpiece including a first electromagnetic energy transmitter or receiver, wherein the first electromagnetic energy transmitter or receiver is located entirely within the handle endpiece;
• activating an end effector located at a distal portion of an elongate shaft including a longitudinal electrical conductor, wherein the elongate shaft is connected to a rotatable member, the rotatable member including a proximal portion and the distal portion, the proximal portion of the rotatable member being rotatably coupled to the handle endpiece, and the distal portion of the rotatable member being coupled to the elongate shaft, the rotatable member including a second electromagnetic energy transmitter or receiver located outside of the elongate shaft, entirely within the rotatable member, and electrically connected to the longitudinal electrical conductor of the elongate shaft, wherein the second electromagnetic energy transmitter or receiver is arranged longitudinally spaced apart and offset from the first electromagnetic energy transmitter or receiver to permit wireless electromagnetic energy transfer therebetween including during rotation of the rotatable member with respect to the handle endpiece, and wired electrical energy transfer between the second electromagnetic energy transmitter or receiver and the longitudinal electrical conductor of the elongate shaft, wherein the first electromagnetic energy transmitter or receiver and the second electromagnetic energy transmitter or receiver wrap around a shared central longitudinal axis and are axially displaced from one another such that the second electromagnetic energy transmitter or receiver is located distally along the shared central axis from the first electromagnetic energy transmitter or receiver, and wherein no portion of the first electromagnetic transmitter or receiver is located in or on the elongate shaft or overlaps any portion of the elongate shaft;
• and
• rotating the rotatable member.

An electrosurgical device comprising:

• an elongate shaft, the elongate shaft including a longitudinal electrical conductor;
• a handle endpiece;
• a rotatable member attached to the elongate shaft at a first end and attached to the handle endpiece at a second end;
• an electromagnetic energy transmitter located entirely within a portion of the handle endpiece, wherein the electromagnetic energy transmitter is electrically coupled to an electrosurgical generator;
• and
• an electromagnetic energy receiver located entirely within, and rotatable together with, the rotatable member, arranged longitudinally spaced apart and offset from the electromagnetic energy transmitter to permit wireless electromagnetic energy transfer therebetween including during rotation of the rotatable member with respect to the handle endpiece, and wired electrical energy transfer with a longitudinal electrical conductor of the elongate shaft, and wherein the electromagnetic energy transmitter and the electromagnetic energy receiver wrap around a shared central longitudinal axis and are axially displaced from one another such that the electromagnetic energy receiver is located distally along the shared central axis from the electromagnetic energy transmitter, and wherein no portion of the electromagnetic energy transmitter is located in or on the elongate shaft or overlaps any portion of the elongate shaft.