Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
권호 표지

Magnetic Nerve Stimulation Coils with Magnetic Mirror Effect

자계 거울 효과를 이용한 신경 자극 코일

  • 한병희 (경희대학교 동서의학대학원) ;
  • 김기왕 (경희대학교 동서의학대학원) ;
  • 김재곤 (경희대학교 동서의학대학원) ;
  • 박태석 (경희대학교 동서의학대학원) ;
  • 이수열 (경희대학교 동서의학대학원) ;
  • 조민형 (경희대학교 동서의학대학원) ;
  • 양종수 (경희대학교 동서의학대학원) ;
  • 김정회 (한양대학교 의과대학 의공학교실)
  • Published : 2002.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

For non-contact nerve stimulations using time varying magnetic field, high amplitude current pulses have to be applied to a magnetic nerve stimulation coil. To increase the magnetic stimulation frequency we have to increase both power supply capacity and cooling capacity of the magnetic nerve stimulator. To alleviate these problems. we propose a new magnetic nerve stimulation coil design methods. Utilizing magnetic mirror effect of a ferro-magnetic plate attached to a magnetic stimulation coil. we have improved efficiency of the stimulation coil. We have analyzed magnetic mirror effect for various kinds of stimulation coils using the finite element method, and we present experimental results obtained with several kinds of stimulation coils.

시변 자계를 이용하여 비접촉적인 방법으로 신경을 자극하기 위해서는 신경자극코일에 대용량 전류 펄스를 순시적으로 인가해야만 한다. 신경자극코일에 인가하는 전류 펄스의 주파수를 증가할수록 신경자극코일에 전력을 공급하는 전력공급기의 용량이 커지게 되고 신경자극코일에 발생하는 열량도 커지는 문제가 발생한다. 본 논문에서는 이러한 문제를 완화하기 위해 새로운 형태의 신경자극코일을 제안하였다. 신경자극코일에 강자성체 구조물을 부착하여 자계 거울 효과를 내게 하면 신경자극코일의 효율이 증가하게 된다. 다양한 형태의 신경자극코일에 대해 자계 거울 효과를 유한요소법으로 분석하였고 몇 종류의 신경자극코일에 대해 실험한 결과를 제시하였다.

Keywords

References

  1. Med. Biol. Eng. Comput. v.20 Stimulation of nerve trunks with time-varying magnetic fields M.J.R. Polson;A.T. Barker;S. Gardiner https://doi.org/10.1007/BF02441362
  2. Lancet v.1 Noninvasive magnetic stimulation of the human motor cortex A.T. Barker;R. Jalinous;I.L. Fresston
  3. J. Clin. Neurophysiol. v.8 no.1 Technical and practical aspects of magnetic nerve stimulation R. Jalinous https://doi.org/10.1097/00004691-199101000-00004
  4. J. Clin. Neurophysiol. v.8 no.1 History of magnetic stimulation of the nervous system L.A. Geddes https://doi.org/10.1097/00004691-199101000-00003
  5. IEEE Trans. Biomed. Eng. v.38 no.5 Prediction of magnetically induced electric fields in biological tissue K.R. Davey;C.H. Cheng;C.M. Epstein https://doi.org/10.1109/10.81560
  6. IEEE Trans. Biomed. Eng. v.38 no.2 Magnetic stimulation of the motor cortex-Theoretical considerations F. Grandori;P. Ravazzani https://doi.org/10.1109/10.76385
  7. IEEE Trans. Biomed. Eng. v.37 no.6 A model of the stimulation of a nerve fiber by electromagnetic induction B.J. Roth;P.J. Basser https://doi.org/10.1109/10.55662
  8. Muscle & Nerve v.13 A theretical calculation of the electric field induced by magnetic stimulation of a peripheral nerve B.J. Roth;L.G. Cohen;M. Hallet;W. Friauf;P.J. Basser https://doi.org/10.1002/mus.880130812
  9. Phys. Med. Biol. v.35 no.8 The distribution of induced currents in magnetic stimulation of the nervous system P.S. Tofts https://doi.org/10.1088/0031-9155/35/8/008
  10. IEEE Trans. Biomed. Eng. v.39 no.1 Effect of surface boundary on neuronal magnetic stimulation D. Durand;A.S. Ferguson;T. Dalbasti https://doi.org/10.1109/10.108128
  11. Med. Biol. Eng. Comput. v.36 Development of a non-invasive treatment system for urinary incontinence using a functional continuous magnetic stimulator N. Ishikawa;S. Suda;T. Sasaki;T. Yamanishi;H. Hosaka;K. Yasuda;H. Ito https://doi.org/10.1007/BF02518872
  12. Neurology & Urodynamics v.18 Induction of urethral closure and inhibition of bladder contraction by continuos magnetic stimulation T. Yamanishi;K. Yasuda;R. Sakakibara;S. Suda;N. Ishikawa;T. Hattori;H. Hosaka https://doi.org/10.1002/(SICI)1520-6777(1999)18:5<505::AID-NAU13>3.0.CO;2-8
  13. Urology v.53 Extracorporeal magnetic innervation therapy for stress urinary incontinence N.T.M. Galloway;R.E.S. El-Galley;P.K. Sand;R.A. Appell;H.W. Russel;S.J. Carlan https://doi.org/10.1016/S0090-4295(99)00037-0
  14. IEEE Trans. Biomed. Eng. v.46 no.6 Theory of multichannel magnetic stimulation: Toward functional neuromuscular rehabilitation J. Ryohonen;P. Ravazzani;F. Grandori;R. Ilmoniemi https://doi.org/10.1109/10.764941
  15. IEEE Trans. Biomed. Eng. v.47 no.11 Magnetic stimulaion coil and circuit design K. Davey;C.M. Epstein https://doi.org/10.1109/10.880101
  16. 대한의용생체공학회지 v.22 no.2 소규모전원장치를 이용한 다채널 자기 신경자극 시스템 한병희;김기왕;이세호;조민형;이수열
  17. 대한의용생체공학회지 v.16 no.3 스위칭전원을 이용한 자기신경 자극기 이수열;이성근;이정한
  18. Magnetic stimulation of the haman nervous system K.R. Mills
  19. Meas. Sci. Technol. v.10 A Design Method for Munimum-Inductance Planar Magnetic-Resonance-Imaging Gradient Coils Considering the Pole-Piece Effect C.H. Moon;H.W. Park;S.Y. Lee https://doi.org/10.1088/0957-0233/10/12/402