Coil Efficiency for Inductive Peripheral Nerve Stimulation
Magnetic stimulation of peripheral nerves is evoked by electric field gradients caused by high-intensity, pulsed magnetic fields created from a coil. Currents required for stimulation are very high, therefore devices are large, expensive, and often too complex for many applications like rehabilitati...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IEEE
2022-01-01
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| Series: | IEEE Transactions on Neural Systems and Rehabilitation Engineering |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9834319/ |
| _version_ | 1797805153727807488 |
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| author | Philipp Braun Jonathan Rapp Werner Hemmert Bernhard Gleich |
| author_facet | Philipp Braun Jonathan Rapp Werner Hemmert Bernhard Gleich |
| author_sort | Philipp Braun |
| collection | DOAJ |
| description | Magnetic stimulation of peripheral nerves is evoked by electric field gradients caused by high-intensity, pulsed magnetic fields created from a coil. Currents required for stimulation are very high, therefore devices are large, expensive, and often too complex for many applications like rehabilitation therapy. For repetitive stimulation, coil heating due to power loss poses a further limitation. The geometry of the magnetic coil determines field depth and focality, making it the most important factor that determines the current required for neuronal excitation. However, the comparison between different coil geometries is difficult and depends on the specific application. Especially the distance between nerve and coil plays a crucial role. In this investigation, the electric field distribution of 14 different coil geometries was calculated for a typical peripheral nerve stimulation with a 27 mm distance between axon and coil. Coil parameters like field strength and focality were determined with electromagnetic field simulations. In a second analysis, the activating function along the axon was calculated, which quantifies the efficiency of neuronal stimulation. Moreover, coil designs were evaluated concerning power efficacy based on ohmic losses. Our results indicate that power efficacy of magnetic neurostimulation can be improved significantly by up to 40% with optimized coil designs. |
| first_indexed | 2024-03-13T05:47:44Z |
| format | Article |
| id | doaj.art-58e2f49de09a4004b4c5cca33c81f9f1 |
| institution | Directory Open Access Journal |
| issn | 1558-0210 |
| language | English |
| last_indexed | 2024-03-13T05:47:44Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Transactions on Neural Systems and Rehabilitation Engineering |
| spelling | doaj.art-58e2f49de09a4004b4c5cca33c81f9f12023-06-13T20:07:52ZengIEEEIEEE Transactions on Neural Systems and Rehabilitation Engineering1558-02102022-01-01302137214510.1109/TNSRE.2022.31927619834319Coil Efficiency for Inductive Peripheral Nerve StimulationPhilipp Braun0https://orcid.org/0000-0003-4486-7776Jonathan Rapp1https://orcid.org/0000-0001-7187-6972Werner Hemmert2https://orcid.org/0000-0002-2905-6118Bernhard Gleich3https://orcid.org/0000-0002-0574-7678Klinikum rechts der Isar (MRI), Technische Universität München, München, GermanyMunich Institute of Biomedical Engineering (MIBE), Technische Universität München, Garching, GermanyBio-inspired Information Processing (BAI), Munich Institute of Biomedical Engineering (MIBE), Technische Universität München, Garching, GermanyMunich Institute of Biomedical Engineering (MIBE), Technische Universität München, Garching, GermanyMagnetic stimulation of peripheral nerves is evoked by electric field gradients caused by high-intensity, pulsed magnetic fields created from a coil. Currents required for stimulation are very high, therefore devices are large, expensive, and often too complex for many applications like rehabilitation therapy. For repetitive stimulation, coil heating due to power loss poses a further limitation. The geometry of the magnetic coil determines field depth and focality, making it the most important factor that determines the current required for neuronal excitation. However, the comparison between different coil geometries is difficult and depends on the specific application. Especially the distance between nerve and coil plays a crucial role. In this investigation, the electric field distribution of 14 different coil geometries was calculated for a typical peripheral nerve stimulation with a 27 mm distance between axon and coil. Coil parameters like field strength and focality were determined with electromagnetic field simulations. In a second analysis, the activating function along the axon was calculated, which quantifies the efficiency of neuronal stimulation. Moreover, coil designs were evaluated concerning power efficacy based on ohmic losses. Our results indicate that power efficacy of magnetic neurostimulation can be improved significantly by up to 40% with optimized coil designs.https://ieeexplore.ieee.org/document/9834319/Coil designmagnetic stimulationfield simulationperipheral stimulation |
| spellingShingle | Philipp Braun Jonathan Rapp Werner Hemmert Bernhard Gleich Coil Efficiency for Inductive Peripheral Nerve Stimulation IEEE Transactions on Neural Systems and Rehabilitation Engineering Coil design magnetic stimulation field simulation peripheral stimulation |
| title | Coil Efficiency for Inductive Peripheral Nerve Stimulation |
| title_full | Coil Efficiency for Inductive Peripheral Nerve Stimulation |
| title_fullStr | Coil Efficiency for Inductive Peripheral Nerve Stimulation |
| title_full_unstemmed | Coil Efficiency for Inductive Peripheral Nerve Stimulation |
| title_short | Coil Efficiency for Inductive Peripheral Nerve Stimulation |
| title_sort | coil efficiency for inductive peripheral nerve stimulation |
| topic | Coil design magnetic stimulation field simulation peripheral stimulation |
| url | https://ieeexplore.ieee.org/document/9834319/ |
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