rtms-tiny coil  (Magstim Company)

Journal: Nature Communications

Article Title: A wearable repetitive transcranial magnetic stimulation device

doi: 10.1038/s41467-025-58095-9

Figure Lengend Snippet: a rTMS-tiny consists of a magnetic stimulator and a magnetic core figure-8 coil. The magnetic core coil weighs 1.7 kg, with an outer diameter of 78 mm. The magnetic stimulator measures 17 cm × 14 cm × 6 cm and weighs 1.3 kg. These are connected by a 1.5-meter cable. b Output of sinusoidal biphasic magnetic pulse with a pulse width of 348 μs, a maximum magnetic flux intensity of 1.2 Tesla on the coil surface, and a maximum repetition frequency of 100 Hz. c Handheld operation with pulse control through a touchscreen interface. The magnetic core coil is secured to the head using an elastic band that wraps around the chin. The portion of the coil that contacts the head is padded with foam, increasing the contact area, reducing pressure on the scalp, and enhancing stability. d The device is worn on the body, with the stimulator secured across the back using a single or dual shoulder strap configuration, freeing the hands and enabling rTMS stimulation during free behaviors.

Article Snippet: The temperature curves for three types of coils (Magstim D70, D70 AFC, and rTMS-tiny) at two stimulation intensities (95% MSO and 70% MSO) are shown in Fig. .

Techniques: Control

Journal: Nature Communications

Article Title: A wearable repetitive transcranial magnetic stimulation device

doi: 10.1038/s41467-025-58095-9

Figure Lengend Snippet: a Measured induced voltage waveform at the coil surface. b Peak magnetic flux density at different distances from the coil surface. c Single-pulse energy loss at 100% power. Magstim lost 149 J per single pulse, while rTMS-tiny lost only 13.4 J. d Relationship between the output frequency and the maximum available stimulus intensity. The stimulus intensity can reach 100% MSO for frequencies ranging from 1 Hz to 55 Hz. For frequencies greater than 55 Hz, the available stimulus intensity decreases. For instance, at 100 Hz, it decreases to 55% MSO. rTMS-tiny’s repetitive output capability reached the level of the Magstim Super Rapid2 Plus conventional TMS device. e Coil temperature after stimulation given a starting temperature of 25 °C. Coil temperature remained within the requirements of IEC 60601-1. f Infrared thermal imaging of the coil after 3000 pulses of 10 Hz rTMS at 95% MSO. The heat diffused from the copper coil to the surroundings, with a maximum temperature of 41.8 °C. g rTMS waveform at 100% MSO. Pulse stimulation frequency is 10 Hz. No decay of stimulation intensity between pulses. h TBS waveform at 100% MSO. Pulse stimulation frequency is 50 Hz, 3 pulses form a cluster, with a repetition frequency of clusters at 5 Hz. Less than 5% decay of stimulation intensity within each cluster, and no decay of stimulation intensity between clusters. i Battery endurance. At 70% MSO, rTMS-tiny delivered 8200 pulses of 10 Hz rTMS, and at 95% intensity, it delivered 3500 pulses.

Article Snippet: The temperature curves for three types of coils (Magstim D70, D70 AFC, and rTMS-tiny) at two stimulation intensities (95% MSO and 70% MSO) are shown in Fig. .

Techniques: Imaging, Battery