"The Triple Halo Coil is an example of a custom coil produced by Jaltron to the specifications provided by users, in this case Iowa State University Electrical and Computer Engineering Department. The patented design was developed by David C. Jiles, Ravi L. Hadimani, and Priyam Rastogi for the purpose of "transcranial magnetic stimulation enabling stimulation of deep regions of the brain without excessively stimulating the cortex."