1. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 Block schematic of a conventional RLC circuit based magnetic stimulator design Figure Legend:

2. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 (a) Schematic diagram of the new magnetic stimulator design using IGBTs (active switch) in parallel and multiple stacked coils, (b) a ramp shape current pulse and its time derivative rectangular pulse generated by the new magnetic stimulator circuit, and (c) the current waveform of one of the coils with different slopes when one, two, or three coils were activated at a time Figure Legend:

3. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 (a) Circular coil, and (b) multiple stacked coils Figure Legend:

4. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 Measured coil current from two coils showing the effect of mutual inductance (- - - indicates coil 1 current turned off, · · · indicates coil 2 current turned off) Figure Legend:

5. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 Experimental setup for recording the CMAP and force from the ADM muscle using magnetic stimulation: (a) a stimulator with the cover open, (b) a stimulator with the coil attached and positioned for stimulating the ulnar nerve at the elbow; a foot ruler is shown in the foreground stuck on the edge of the table Figure Legend:

6. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 Measured coil voltages when (a1) one coil, (a2) two coils, and (a3end)–(a3middle) three coils were activated. Calculated coil currents of each coil when (b1) one coil, (b2) two coils, and (b3end)–(b3middle) three coils were activated. (a3end) and (b3end) The end coils, and (a3middle) and (b3middle) the middle coil with three coils activated at different pulse widths (- - -, 90 μs; · · ·, 130 μs; and —, 160 μs). Figure Legend:

7. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 Tested pulse width and coil combination for different pulse strengths tabulated in Table 1 and plotted as circles on the hypothetical strength-duration map of a compound nerve. Each curve represent a twitch of a different size (1, 2, and 3 in the parentheses indicates the activation of one, two, or three coils, respectively, at different pulse widths). Figure Legend:

8. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 The left set of figures show the CMAP recorded with (a1) one, (a2) two, and (a3) three coils. The CMAP was recorded from the ADM muscle and the stimulation was delivered at the brachial plexus to show a long latency from the stimulation artifact (the latency is about 17.7 μs and the distance of the ADM from the brachial plexus is 70 cm). The right set of figures show the twitch force with (b1) one, (b2) two, and (b3) three coils; the force was recorded from the ADM muscle and the stimulation was delivered distal to the elbow to reduce movement of the arm. Figure Legend:

9. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 (a) and (d) CMAP obtained from the ADM muscle at different frequencies (1 Hz, 2 Hz, 5 Hz, 10 Hz, 20 Hz, 50 Hz, and 100 Hz) during magnetic stimulation of the ulnar nerve, and (b), (c), and (e) the force obtained from the ADM muscle at 1, 2, 5, 10, 20, 50, and 100 Hz, corresponding to a train of five stimulus pulses (the arrow indicates the stimulus pulse) Figure Legend:

10. Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: A Novel Magnetic Stimulator Using Parallel Excited Coils and Capable of High Frequency Stimulation J. Med. Devices. 2013;8(1):011006-011006-9. doi:10.1115/1.4025422 Exponentially decaying current pulse and the measured coil current generated by a conventional magnetic stimulator built in the lab Figure Legend: