A magnetic field device (10) for directing a magnetic coupling source includes an electrical power source (30-34), a control module (40), a muzzle (20), and an electromagnet (12) adjacent the muzzle and connected to the electrical power source. A magnetic sensor (22) within the muzzle is adjacent to the electromagnet. A magnet loading chamber (35) is adjacent to the electromagnet magnetic and opposite to the magnetic sensor. The magnet loading chamber is configured to accommodate one or more permanent magnets (14). A magnetic shield surrounds exterior surfaces of the electromagnet and magnet loading chamber. A user operable control device (26) is electrically connected to the electromagnet and to the electrical power source. The control device regulates an amount of electric current from the electrical power source to the electromagnet. A magnet guidewire delivery system includes a guide wire (40) having a magnetic element and a magnetic field device generating a magnetic field that couples with the magnetic element.
