SHAPED COILS FOR TRANSCRANIAL MAGNETIC STIMULATION
Described herein are shaped coil TMS electromagnets formed by two bent magnetic coil loops joined at a vertex having an angle between the outer coil regions of the coils that is typically less than 120 degrees (e.g., between about 45 and about 70 degrees, 60 degrees, etc.). The vertex region shaped to optimize the magnetic field projected from the TMS electromagnet. For example, the vertex region may be horizontal or vertical. In some variations the vertex region is formed by re-arranging the conductive windings forming the two coils so that they are no longer arranged in the same columnar structure that they are in the other portions of the bent magnetic coil loops. These TMS electromagnets may be well suited for use in deep-brain Transcranial Magnetic Stimulation.
1 . A Transcranial Magnetic Stimulation (TMS) electromagnet comprising:
a first bent magnetic coil loop foiiiied of a column comprising a plurality of windings;
a second bent magnetic coil loop formed of a column comprising a plurality of windings;
a flat-bottomed vertex region between the first and second bent magnetic coil loops;
wherein the angle between an outer coil region of the first bent magnetic coil loop and the outer coil region of the second bent magnetic coil loop is between about 55 and about 65 degrees; and
wherein the flat-bottom vertex region is formed by arranging an inner coil region of the first bent magnetic coil loop immediately adjacent to an inner coil region of the second bent magnetic coil loop so that the column of windings forming the first and second inner coil regions are at an angle of approximately 180 degrees with respect to each other.