Electrical rotating cutting instruments and systems

1 . An electrical cutting system for use with a rotating cutting instrument, a surgical motor, and a control unit for the surgical motor, the rotating cutting instrument comprising a proximal electrically-conductive shank configured to receive torque, an electrically-conductive outer electrode in electrical contact with the proximal electrically-conductive shank, and an electrically-conductive inner electrode, the electrical cutting system comprising:

a handpiece configured to be removably coupled to the rotating cutting instrument, the handpiece comprising:

an external casing comprising a cap; and

a torque transmitter comprising an internal channel sized and shaped to removably receive the proximal electrically-conductive shank of the rotating cutting instrument therein such that a proximal end portion of the rotating cutting instrument extends proximally out of the torque transmitter and a distal end portion of the rotating cutting instrument extends distally out of the torque transmitter, the torque transmitter configured to transmit the torque generated by the surgical motor to the proximal electrically-conductive shank when the rotating cutting instrument is removably coupled to the handpiece;

a central unit configured to emit signals to and collect signals from the rotating cutting instrument and provide information to a user of the electrical cutting system; and

an electrical connecting system configured to electrically connect the electrically-conductive outer electrode and the electrically-conductive inner electrode to the central unit, the electrical connecting system comprising:

an outer-electrode electrical connector comprising an outer-electrode electrical contact, and an insulated electrical wire electrically coupled to the outer-electrode electrical contact and to the central unit; and

an inner-electrode electrical connector comprising an inner-electrode electrical contact, and an insulated electrical wire electrically coupled to the inner-electrode electrical contact and to the central unit,

wherein the handpiece is configured such that when the rotating cutting instrument is removably coupled to the handpiece, the outer-electrode electrical contact is in electrical contact with the electrically-conductive outer electrode, and the inner-electrode electrical contact is in electrical contact with the electrically-conductive inner electrode via the proximal end portion of the rotating cutting instrument extending proximally from the torque transmitter.

2 . The electrical cutting system according to claim 1 , further comprising the rotating cutting instrument, the rotating cutting instrument comprising:

a proximal electrically-conductive shank configured to receive torque;

an electrically-conductive outer electrode in electrical contact with the proximal electrically-conductive shank, the electrically-conductive outer electrode comprising an electrically-conductive distal end portion sized and shaped to penetrate tissue when rotated;

an electrically-conductive inner electrode having a proximal end portion; and

an electrical isolation layer between the electrically-conductive outer electrode and the electrically-conductive inner electrode, so as to electrically isolate the electrically-conductive outer electrode and the electrically-conductive inner electrode from each other.

3 . The electrical cutting system according to claim 2 , wherein the rotating cutting instrument comprises a drill bit, a milling drill bit, or a burr.

4 . The electrical cutting system according to claim 2 , wherein the rotating cutting instrument comprises exactly one electrically-conductive outer electrode and exactly one electrically-conductive inner electrode, and wherein the electrical isolation layer is radially between the exactly one electrically-conductive outer electrode and the exactly one electrically-conductive inner electrode.

5 . The electrical cutting system according to claim 2 , wherein the proximal electrically-conductive shank is integral with the electrically-conductive distal end portion, or

wherein the proximal electrically-conductive shank and the electrically-conductive distal end portion comprise separate pieces that are directly mechanically and electrically coupled to each other, or

wherein the proximal electrically-conductive shank and the electrically-conductive distal end portion comprise separate pieces that are indirectly mechanically and electrically coupled to each other.

6 . The electrical cutting system according to claim 2 , wherein a proximal portion of the proximal electrically-conductive shank is shaped so as to define at least one lateral planar surface that is configured to receive the torque, or

wherein a distal portion of the proximal electrically-conductive shank is shaped so as to define a circular cross-section except for at least one lateral planar surface that is configured to receive the torque, or

wherein a distal portion of the proximal electrically-conductive shank is shaped so as to have a non-polygonal cross-section that is configured to receive the torque.

7 . The electrical cutting system according to claim 1 , wherein the electrical cutting system is configured to electrically connect the electrically-conductive inner electrode to ground.

8 . The electrical cutting system according to claim 1 , wherein the electrical cutting system is configured to electrically connect the electrically-conductive outer electrode to ground.

9 . The electrical cutting system according to claim 1 , wherein the handpiece is configured such that when the rotating cutting instrument is coupled to the handpiece, the outer-electrode electrical contact is in electrical contact with the electrically-conductive outer electrode via the proximal electrically-conductive shank.

10 . The electrical cutting system according to claim 1 , wherein the handpiece is configured such that when the rotating cutting instrument is coupled to the handpiece, a distal end portion of the electrically-conductive outer electrode of the rotating cutting instrument extends distally out of the handpiece, and

wherein the electrical connecting system is configured such that the inner-electrode electrical contact is disposed within the handpiece, and a portion of the inner-electrode electrical connector passes through a hole defined by a proximal end part of the cap.

11 . The electrical cutting system according to claim 10 , wherein the inner-electrode electrical contact of the electrical connecting system is configured to be electrically coupled to a proximal end portion of the inner electrode.

12 . The electrical cutting system according to claim 11 , wherein the inner-electrode electrical contact of the electrical connecting system comprises one or more contact elements selected from the group consisting of: one or more wires, one or more blades, one or more carbon contacts, and one or more brushes.

13 . The electrical cutting system according to claim 12 , wherein the proximal end portion of the inner electrode is shaped so as to define one or more grooves, and

wherein the one or more contact elements are configured to mechanically and electrically contact the one or more grooves.

14 . The electrical cutting system according to claim 1 , wherein the cap is shaped so as to define a hole therethrough, wherein the inner-electrode electrical contact is configured to be coupled in electrical contact with the electrically-conductive inner electrode of the rotating cutting instrument, and wherein the inner electrode protrudes out of the cap via the hole.

15 . The electrical cutting system according to claim 1 , wherein the handpiece is configured such that when the rotating cutting instrument is coupled to the handpiece, a distal end portion of the electrically-conductive outer electrode of the rotating cutting instrument extends distally out of the handpiece, and

wherein the electrical connecting system is configured such that the inner-electrode electrical contact is disposed within the handpiece.

16 . The electrical cutting system according to claim 15 , wherein the inner-electrode electrical connector of the electrical connecting system comprises a pusher, which is located inside the cap, which is shaped so as to define the inner-electrode electrical contact, and which is configured to push the inner-electrode electrical contact into electrical contact with the electrically-conductive inner electrode,

wherein the pusher is configured to have a spring effect to maintain continuous contact between the inner-electrode electrical contact and the electrically-conductive inner electrode, or

wherein the inner-electrode electrical connector further comprises a spring, which is configured to push the pusher.

17 . The electrical cutting system according to claim 15 , wherein the inner-electrode electrical contact of the electrical connecting system comprises at least one blade located inside the cap.

18 . The electrical cutting system according to claim 17 , wherein the electrically-conductive inner electrode protrudes proximally out of the outer electrode.

19 . The electrical cutting system according to claim 1 , wherein the handpiece is configured such that when the rotating cutting instrument is coupled to the handpiece, a distal end portion of the electrically-conductive outer electrode of the rotating cutting instrument extends distally out of the handpiece, and

wherein the electrical connecting system is configured such that the outer-electrode electrical contact is disposed within the handpiece, and a portion of the outer-electrode electrical connector passes through a hole defined by a proximal end part of the cap.

20 . The electrical cutting system according to claim 1 , wherein the handpiece is configured such that when the rotating cutting instrument is coupled to the handpiece, a distal end portion of the electrically-conductive outer electrode of the rotating cutting instrument extends distally out of the handpiece, and

wherein the electrical connecting system is configured such that the outer-electrode electrical contact of the electrical connecting system is configured to be coupled in electrical contact with the electrically-conductive outer electrode of the rotating cutting instrument, and wherein the electrically-conductive outer electrode protrudes out of the cap.

21 . The electrical cutting system according to claim 1 , wherein the handpiece is configured such that when the rotating cutting instrument is coupled to the handpiece, a distal end portion of the electrically-conductive outer electrode of the rotating cutting instrument extends distally out of the handpiece, and

wherein the electrical connecting system is configured such that the outer-electrode electrical contact is disposed within the handpiece.

22 . The electrical cutting system according to claim 21 , wherein the outer-electrode electrical contact of the electrical connecting system is configured to be coupled in direct electrical contact with the electrically-conductive outer electrode of the rotating cutting instrument.

23 . The electrical cutting system according to claim 22 , wherein the outer-electrode electrical contact of the electrical connecting system comprises one or more contact elements selected from the group consisting of: one or more wires, one or more blades, one or more carbon contacts, and one or more brushes.

24 . The electrical cutting system according to claim 22 , wherein the electrically-conductive outer electrode of the rotating cutting instrument is shaped so as to define at least one groove.

25 . The electrical cutting system according to claim 22 , wherein the electrical connecting system comprises springs configured to apply a controlled load between the outer-electrode electrical contact and the electrically-conductive outer electrode of the rotating cutting instrument.

26 . The electrical cutting system according to claim 21 , wherein the outer-electrode electrical connector of the electrical connecting system is in electrical contact with the cap.

27 . The electrical cutting system according to claim 21 , wherein the outer-electrode electrical connector of the electrical connecting system comprises a pusher, which is located inside the cap, which is shaped so as to define the outer-electrode electrical connector, and which is configured to push the outer-electrode electrical contact into electrical contact with the electrically-conductive outer electrode,

wherein the pusher is configured to have a spring effect to maintain continuous contact between the outer-electrode electrical contact and the electrically-conductive outer electrode, or

wherein the outer-electrode electrical contact further comprises a spring, which is configured to push the pusher.

28 . The electrical cutting system according to claim 21 , wherein the outer-electrode electrical connector of the electrical connecting system is configured to be coupled in electrical contact with the electrically-conductive outer electrode of the rotating cutting instrument via the torque transmitter.

29 . The electrical cutting system according to claim 28 , wherein the torque transmitter is configured to be coupled in direct electrical contact with the electrically-conductive outer electrode of the rotating cutting instrument, or

wherein the torque transmitter comprises one or more contact elements, and is configured to be coupled in indirect electrical contact with the electrically-conductive outer electrode of the rotating cutting instrument via the one or more contact elements, the one or more contact elements selected from the group consisting of one or more blades, one or more wires, one or more carbon contacts, and one or more brushes, or

wherein the torque transmitter comprises a pin and spring system, and is configured to be coupled in indirect electrical contact with the electrically-conductive outer electrode of the rotating cutting instrument via the pin and spring system.

30 . The electrical cutting system according to claim 1 , wherein the central unit is external to the control unit for the surgical motor, or

wherein the electrical connecting system comprises wires that are external to the handpiece, or

wherein the electrical connecting system is configured such that at least a portion of the insulated electrical wire of the inner-electrode electrical connector is disposed external to the handpiece, or

wherein the electrical connecting system is configured such that at least a portion of the insulated electrical wire of the outer-electrode electrical connector is disposed external to the handpiece.

31 . The electrical cutting system according to claim 1 , wherein the central unit is embedded into the control unit for the surgical motor,

wherein the electrical connecting system is configured such that at least a portion of the insulated electrical wire of the inner-electrode electrical connector is disposed external to the handpiece, or

wherein the electrical connecting system is configured such that at least a portion of the insulated electrical wire of the outer-electrode electrical connector is disposed external to the handpiece, or

wherein the electrical connecting system comprises wires that are internal to the handpiece, or

wherein the electrical connecting system comprises wires that are external to a wire of the surgical motor, or

wherein the electrical connecting system comprises wires that are internal to a wire of the surgical motor.

32 . The electrical cutting system according to claim 1 , wherein the electrical signals from the rotating cutting instrument are transferred to the central unit via a wireless connection.

33 . A method of using a rotating cutting instrument with an electrical cutting system, the rotating cutting instrument comprising a proximal electrically-conductive shank configured to receive torque, an electrically-conductive outer electrode in electrical contact with the proximal electrically-conductive shank, and an electrically-conductive inner electrode, the method comprising:

removably coupling the proximal electrically-conductive shank of the rotating cutting instrument extends to a torque transmitter of a handpiece of the electrical cutting system such that a proximal end portion of the rotating cutting instrument extends proximally out of the torque transmitter and a distal end portion of the rotating cutting instrument extends distally out of the torque transmitter;

electrically coupling the electrically-conductive outer electrode and the electrically-conductive inner electrode of the rotating cutting instrument with a central unit of the electrical cutting system via an outer-electrode electrical connector and an inner-electrode electrical connector, respectively, such that an outer-electrode electrical contact of the outer-electrode electrical connector is in electrical contact with the electrically-conductive outer electrode and an inner-electrode electrical contact of the inner-electrode electrical connector is in electrical contact with the electrically-conductive inner electrode via the proximal end portion of the rotating cutting instrument extending proximally from the torque transmitter;

activating the torque transmitter to transmit torque generated by the surgical motor to the proximal electrically-conductive shank to cause the rotating cutting instrument to penetrate into tissue via an electrically-conductive distal end portion of the electrically-conductive outer electrode; and

using the central unit, measuring an electrical characteristic of the tissue sensed via the electrically-conductive outer electrode and the electrically-conductive inner electrode.