The National Aeronautics and Space Administration (NASA) has spent years studying magnetic therapy and has built their own pulse electromagnetic field apparatus (PEMF). The concept of unipolar pulsed electromagnetic field (UPEMF) devices is presented; this device is an improved medical apparatus for magnetic therapy based on PEMF. A concentrator is designed to strengthen the magnetic field on the north pole and weaken the opposite field. The UPEMF device provides an approximate unipolar electromagnetic field and meets the medical requirements of magnetic therapy in terms of frequency, shape, and intensity.