Transcranial magnetic stimulation system and methods
A system and methods for transcranial magnetic stimulation, the system including a helmet, a positioning portion, a stimulator and a cooling system, are disclosed. The helmet includes a coil for deep brain magnetic stimulation. The coil has a base portion, and return portions, which may include a protruding return portion and a contacting return portion. The coil is designed to minimize unintended stimulation of portions of the brain, while reducing accumulation of surface charges. The coil is stimulated at several locations and/or at different times so as to focus the electrical field on a specific deep neuronal structure.
1. A method for stimulation of a brain region, the method comprising:
providing a first coil having a first coil base portion for delivering current to the brain region, the first coil base portion positionable on a skull; and a first coil return portion for carrying returning current, the first coil return portion at a distance from the first coil base portion;
providing a second coil having a second coil base portion for delivering current to the brain region, the second coil base portion positionable on a skull;
placing said first coil on the skull of a subject, such that said first coil base portion is in contact with the skull;
placing said second coil on the skull of a subject, such that said second coil base portion is in contact with the skull;
providing a first pulse to said first coil for activating said first coil at a level which is sub-threshold for stimulation of the brain region; and
providing a second pulse to said second coil for activating said second coil at a level which is sub-threshold for stimulation of the brain region, wherein said providing a second pulse to said second coil is done with an interval of 1 microsecond to 100 microseconds after an end of said provided first pulse, so as to provide a summed effect in order to stimulate the brain region.
2. The method of claim 1 , wherein said providing a first pulse to said first coil comprises providing multiple electrical impulses to said first coil and wherein said providing a second pulse to said second coil comprises providing multiple electrical impulses to said second coil.
3. The method of claim 1 , wherein said providing a first pulse to said first coil comprises sequentially providing electrical impulses to individual members of said first coil, and wherein said providing a second pulse to said second coil comprises sequentially providing electrical impulses to individual members of said second coil, wherein said sequentially providing to said first coil is interspersed with said sequentially providing to said second coil.
4. The method of claim 1 , wherein said first and second coils are designed to carry current in predetermined directions, wherein said predetermined directions form a path designed to mimic a neuronal structure.
5. The method of claim 1 , further comprising providing a third pulse to said first or second coil, and wherein said providing a first pulse, providing a second pulse and providing a third pulse are done sequentially.
6. The method of claim 1 , further comprising providing a third pulse to said first or second coil, and wherein said providing a first pulse, providing a second pulse and providing a third pulse are done randomly.
7. The method of claim 1 , further comprising providing a third pulse to said first or second coil, and wherein said providing a first pulse, providing a second pulse and providing a third pulse are done selectively.
8. The method of claim 1 , wherein said interval is between 10 and 100 microseconds.
9. The method of claim 1 , wherein said brain region is a deep brain region.
10. The method of claim 1 , wherein said providing a first pulse comprises providing multiple pulses.
11. The method of claim 10 , wherein said interval comprises multiple intervals between said multiple pulses, and wherein said multiple intervals may be varied thereby causing a particular effect on the brain.