The inventive technique include a system, method and device for treating a patient. The inventive system includes a magnetic core having a highly saturable magnetic material and a conductor wound around at least a portion of the magnetic core. The magnetic core has a first section with a first end and a second end, a second section with a first end and a second end. The first end of the second section is connected at an angle to the first end of the first section. The magnetic core also has a third section with a first end and a second end. The first end of the third section is connected at an angle to the second end of the second section.