mTMS coil device with overlapping coil windings
Provided herein is a multichannel Transcranial Magnetic Stimulation (mTMS) coil device with two or more overlapping coil windings within a casing. The mTMS coil device is capable of adjusting parameters of the stimulation of magnetic and induced electric fields through the selective control of the multiple coil windings within the mTMS coil device. Additionally, provided are methods of operation including navigated TMS for adjusting parameters such as location, direction and/or orientation of magnetic and induced electric fields from mTMS coil devices.
1. A multichannel Transcranial Magnetic Stimulation (mTMS) coil device comprising:
a rigid casing,
a first coil winding housed within the rigid casing having a first power input line, and
a second coil winding housed within the rigid casing having a second power input line, the second coil winding having a different geometry than the first coil winding,
wherein the first and second coil windings each have a center point, and the first and second coil windings are affixed within the casing such that the center points of the first and second coils are overlapping.
2. The mTMS coil device according to claim 1 , wherein the first and second coil windings are each for generating an induced electric field in at least one predetermined direction and orientation when a current is passed through the first and second coil windings.
3. The mTMS coil device according to claim 2 , wherein the predetermined direction and orientation of the induced electric field to be generated by the second coil winding is different from that of the first coil winding.
4. The mTMS coil device according to claim 2 , wherein the second coil winding is for generating an electric field for altering at least one of the direction, position and orientation of the electric field of the first coil winding.
5. The mTMS coil device according to claim 1 , wherein the first and second coil windings each have an axis of symmetry, wherein the first and second coils are arranged with an angle between their respective axes of symmetry.
6. The mTMS coil device according to claim 1 , wherein one of the coil windings is stacked on top of, but electrically separated from, the other coil winding.
7. The mTMS coil device according to claim 1 , wherein the position and orientation of the second coil winding is fixed with respect to the first coil winding.
8. The mTMS coil device according to claim 1 , having at least one additional coil winding.
9. The mTMS coil device according to claim 1 , further comprising a controller for separately controlling a current in each of the coil windings' power input line.
10. The mTMS coil device according to claim 1 , wherein the rigid casing comprises hinges between modules.
11. The mTMS coil device according to claim 1 , wherein the coil device is configured to deliver TMS.
12. The mTMS coil device according to claim 1 , wherein one of the coil windings is a FIG. 8 coil winding.
13. The mTMS coil device according to claim 1 , wherein the center points overlap in a plane perpendicular to an axis of symmetry of one of the coil windings.
14. The mTMS coil device according to claim 1 , wherein the center points overlap when viewed towards a direction of intended stimulation of at least one of the coil windings.
15. A method of controlling a multichannel Transcranial Magnetic Stimulation (mTMS) coil having at least two coil windings, comprising the steps of:
determining a target location within the brain of an individual,
controlling a first current through a first power line of a first coil winding to generate a first, primary electric field, and
modifying the position, direction and/or orientation of the primary electric field by separately controlling a second current through a second power line of a second coil winding to generate a second, secondary electric field such that the modified primary electric field targets the target location within the brain of an individual, the second coil winding having a different geometry than the first coil winding,
wherein the first and second coil windings each have a center point, and the first and second coils are arranged with their center points overlapping.
16. The method in accordance with claim 15 , further comprising the step of generating at least two electromagnetic pulses with different target points and/or orientations with the mTMS coil device in the same location and orientation.
17. The method in accordance with claim 15 , wherein one of the coil windings is a FIG. 8 coil winding.
18. A non-transitory computer readable medium having stored thereon a set of computer readable instructions for causing a processor to carry out the steps of:
determining a target location within the brain of an individual,
controlling a first current through a first power line of a first coil winding to generate a first, primary electric field, and
modifying the position, strength, direction and/or orientation of the primary electric field by separately controlling a second current through a second power line of a second coil winding to generate a second, secondary electric field such that the modified primary electric field targets the target location within the brain of an individual, the second coil winding having a different geometry than the first coil winding,
wherein the first and second coil windings each have a center point, and the center points of the first and second coil windings are overlapping.