Trial Manufacture of Magnetic Stimulation Coil to Induce the Contraction of Suprahyoid Muscles

Mori, Hidemaro; Yashima, Kenji; Kosukegawa, Hiroyuki; Izumi, Shin-ichi; Takagi, Toshiyuki

doi:10.3951/biomechanisms.24.79

Cited by 4 publications

(8 citation statements)

References 7 publications

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“…For instance, Mori et al describe a small round coil to stimulate suprahyoid muscles obtaining hyoid elevation in patients affected by dysphagia but lacking technical details. 52,62,63 This paper presents the validated results of multiphysics electromagnetic and electrophysiological in silico experiments used to characterize and improve the performances of a new type of miniaturized coil (mcoil) with an improved stimulation profile in terms of focality by using microstrips instead of wires. In these simulations, a detailed model of the mcoil was placed in correspondence to the superficial branch of the radial nerve over the arm of the Yoon-Sun anatomical body model (Virtual Population, ViP v.4.0 64 ) functionalized with principal nerve trajectories.…”

Section: Introductionmentioning

confidence: 99%

A study of flex miniaturized coils for focal nerve magnetic stimulation

et al. 2022

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Background: Peripheral magnetic stimulation (PMS) is emerging as a complement to standard electrical stimulation (ES) of the peripheral nervous system (PNS). PMS may stimulate sensory and motor nerve fibers without the discomfort associated with the ES used for standard nerve conduction studies. The PMS coils are the same ones used in transcranial magnetic stimulation (TMS) and lack focality and selectiveness in the stimulation. Purpose: This study presents a novel coil for PMS, developed using Flexible technologies, and characterized by reduced dimensions for a precise and controlled targeting of peripheral nerves. Methods: We performed hybrid electromagnetic (EM) and electrophysiological simulations to study the EM exposure induced by a novel miniaturized coil (or mcoil) in and around the radial nerve of the neuro-functionalized virtual human body model Yoon-Sun, and to estimate the current threshold to induce magnetic stimulation (MS) of the radial nerve. Eleven healthy subjects were studied with the mcoil, which consisted of two 15 mm diameter coils in a figure-ofeight configuration, each with a hundred turns of a 25 µm copper-clad four-layer foil. Sensory nerve action potentials (SNAPs) were measured in each subject using two electrodes and compared with those obtained from standard ES. The SNAPs conduction velocities were estimated as a performance metric. Results: The induced electric field was estimated numerically to peak at a maximum intensity of 39 V/m underneath the mcoil fed by 70 A currents. In such conditions, the electrophysiological simulations suggested that the mcoil elicits SNAPs originating at 7 mm from the center of the mcoil. Furthermore, the numerically estimated latencies and waveforms agreed with those obtained during the PMS experiments on healthy subjects, confirming the ability of the mcoil to stimulate the radial nerve sensory fibers. Conclusion: Hybrid EM-electrophysiological simulations assisted the development of a miniaturized coil with a small diameter and a high number of turns using flexible electronics. The numerical dosimetric analysis predicted the threshold current amplitudes required for a suprathreshold peripheral nerve sensory stimulation, which was experimentally confirmed. The developed and now validated computational pipeline will be used to improve the performances (e.g., focality and minimal currents) of new generations of mcoil designs.

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Section: Introductionmentioning

confidence: 99%

A study of flex miniaturized coils for focal nerve magnetic stimulation

et al. 2022

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“…However, a complicated invasive procedure is needed, and using implanted electrodes causes a risk of infection. In contrast, the surface electrodes are easy to use, but submental electrodes may stimulate inferior alveolar nerve that induces pain to the teeth . Kagaya et al obtained 2.7 ± 0.1 mm forward and 0.4 ± 0.5 mm upward movements of the hyoid bone by stimulating the geniohyoid muscles with surface electrodes in two healthy men.…”

Section: Discussionmentioning

confidence: 99%

“…A specially designed coil with a U‐figure core was connected to the Pathleader. The details of the U‐figure core are described elsewhere . The coil was placed on the submental area of the subjects to stimulate the geniohyoid, the mylohyoid, the anterior belly of digastric of the suprahyoid muscles (Fig.…”

Section: Methodsmentioning

confidence: 99%

Hyoid Bone Movement at Rest by Peripheral Magnetic Stimulation of Suprahyoid Muscles in Normal Individuals

Kagaya

Ogawa

Mori

et al. 2019

Neuromodulation: Technology at the Neural Interface

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“…Mori et al developed a compact U-shaped coil for contracting suprahyoid muscles in order to reduce stimulation of the inferior alveolar nerve, which can be excited using the usual round coil. 16 Kagaya et al revealed this U-shaped coil could induce hyoid bone movement with minimal pain. It is essential to examine the pain-stimulus intensity relationship for both individual target body sites and the type of device used when applying rPMS.…”

Section: Introductionmentioning

confidence: 99%

<p>Difference in Pain and Discomfort of Comparable Wrist Movements Induced by Magnetic or Electrical Stimulation for Peripheral Nerves in the Dorsal Forearm</p>

Abe¹,

Oyama²,

Liao³

et al. 2020

MDER

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Purpose Both repetitive peripheral magnetic stimulation (rPMS) and transcutaneous electrical current stimulation (TES) could elicit the limb movements; it is still unclear how subjective sensation is changed according to the amount of limb movements. We investigated the pain and discomfort induced by newly developed rPMS and TES of peripheral nerves in the dorsal forearm. Methods The subjects were 12 healthy adults. The stimulus site was the right dorsal forearm; thus, when stimulated, wrist dorsiflexion was induced. The rPMS was delivered by the new stimulator, Pathleader at 10 stimulus intensity levels, and TES intensity was in 1-mA increments. The duration of each stimulation was 2 s. The analysis parameters were subjective pain and discomfort, measured by a numerical rating scale. The rating scale at corresponding levels of integrated range of movement (iROM) induced by rPMS or TES was compared. The subjective values were analyzed by two-way repeated measures ANOVA with the stimulus conditions (rPMS, TES) and the seven levels of iROM (20–140 ºs). Results In the rPMS experiments, stimuli were administered to all subjects at all stimulus intensities. In the TES experiments, none of the subjects dropped out between 1 and 16 mA, but there were dropouts at each of the intensities as follows: 1 subject at 17 mA, 20 mA, 22 mA, 23 mA, 27 mA, 29 mA and 2 subjects at 21 mA, 24 mA, 26 mA. The main effects of the stimulus conditions and iROM were significant for pain and discomfort. Post hoc analysis demonstrated that pain and discomfort in rPMS were significantly lower compared to TES when the iROM was above 60 ºs and 80 ºs, respectively. Conclusion New rPMS stimulator, Pathleader, caused less pain and discomfort than TES, but this was only evident when comparatively large joint movements occurred.

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Trial Manufacture of Magnetic Stimulation Coil to Induce the Contraction of Suprahyoid Muscles

Cited by 4 publications

References 7 publications

A study of flex miniaturized coils for focal nerve magnetic stimulation

A study of flex miniaturized coils for focal nerve magnetic stimulation

Hyoid Bone Movement at Rest by Peripheral Magnetic Stimulation of Suprahyoid Muscles in Normal Individuals

<p>Difference in Pain and Discomfort of Comparable Wrist Movements Induced by Magnetic or Electrical Stimulation for Peripheral Nerves in the Dorsal Forearm</p>

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