A system composed of a functional continuous magnetic stimulator (FCMS) and a saddle-type coil has been developed for non-invasive treatment of urinary incontinence, especially stress incontinence and urge incontinence. The FCMS conditions were as follows: 2 kW maximum electrical power consumption, 800 V maximum capacitor voltage, 720 μs pulsewidth (180 μs rise time), and 5–30 Hz frequency. A frequency between 5 and 10 Hz is used to treat urge incontinence and a frequency between 25 Hz and 30 Hz is used to treat urge incontinence. The coil (120 mm long, 90 mm wide and 50 mm thick) fits the most suitable region for this treatment, the region from the anus to the perineum. The coil is cooled to maintain a coil temperature between 20 and 25°C so that it can be used efficiently and safely. In experiments with anaesthetised dogs, it was confirmed that the urethral pressure increased when the circumference of the perineum received continuous magnetic stimulation of 720 μs pulsewidth (180 μs rise time), 10Hz frequency and about 520 V capacitor voltage. This result suggests that magnetic stimulation can be effective as a urinary incontinence therapy.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
Barker, A. T., Freeston, I. L., Jalinous R. andJarratt, J. A. (1985): ‘Non-invasive stimulation of motor pathways within the brain using time-varying magnetic fields’,Electroenceph. Clin. Neurophys.,61, pp. 245–246
Barker, A. T. (1991): ‘An introduction to the basic principles of magnetic nerve stimulation’,EEG Suppl.,43, pp. 26–37.
Barker, A. T., Garnham, C. W. andFreeston, I. L. (1991): ‘Magnetic nerve stimulation: the effect of waveform on efficiency, determination of neural membrane time constants and the measurement of stimulator output’,EEG Suppl.,43, pp. 227–237
Bischoff, C., Riescher, H., Machetanz, J., Meyers, B.-U. andConrad, B. (1995): ‘Comparison of various coils used for magnetic stimulation of peripheral motor nerves: physiological considerations and consequences for diagnostic use’,Electroenceph. Clin. Neurophys.,97 pp. 332–340
Cadwell, J. (1991): ‘Optimizing magnetic stimulator design’,EEG Suppl.,43, pp. 238–248
Caldwell, K. P. (1968): ‘The use of electrical stimulation in urinary retention and incontinence’,Proc. R. Med.,61(7), pp. 703
Eriksen, B. C., Begrmann, S. andEik-Nes, S. H. (1989): ‘Maximal electrostimulation of the pelvic floor in female idiopathic detrusor instability and urge incontinence’,Neurourol. Urodyn.,8, pp. 219–230
Ishikawa, N., Suda, S., Sasaki, T., Hosaka, H., Yamanishi, T., Yasuda, K. andItoh, H. (1997): ‘Non-invasive treatment system for urinary incontinence using continuous magnetic stimulation’,Proc. IEEE Int. EMBS Conf., Chicago, pp. 2096–2099
Ishikawa, N. Suda, S., Sasaki, T., Hosaka, H., Yamanishi, T., Yasuda, K. andItoh, H. (1998): ‘Eddy current density for non-invasive treatment system for urinary incontinence using functional continuous magnetic stimulator (FCMS)’, inProc. Int. Bioelectromagnetism Conf., Melbourne, pp. 123–124
Mathis, J., Seemann, U., Weyh, T., Jakobischoff, C. andStruppler, A. (1995): ‘The boundary effect in magnetic stimulation analysis at the peripheral nerve’,Electroenceph. Clin. Neurophys.,97, pp. 238–245
Nielsen, J. F., Klemar, B. andKiilerich, H. (1995): ‘A new high-frequency magnetic stimulator with an oil-cooled coil’,J. Clin. Neurophys.,12(5), pp. 460–467
Nilsson, J., Panizza, M., Roth, B.J., Basser, P. J., Cohen, L. G., Caruso, G. andHallet, M. (1992): ‘Determining the site of stimulation during magnetic stimulation of peripheral nerve’,Electroenceph. Clin. Neurophys.,85, pp. 253–264
Okino, H., Kitano, T., Igarashi, I., Inagaki, H. andMizuno, M. (1979): ‘Miniaturized blood pressure transducer’,Biomedizinishe Band,24, pp. 56–57
Onuki, T., Wakao, S. andYoshizawa, T. (1995): ‘Eddy current computations in moving conductors by the Hybrid FE-BE Methods’,IEEE Trans. Magn. 31(3) pp. 1436
Pascual-Leone, A., Gates, J. R. andDhuna, A. (1991): ‘Induction of speech arrest and counting errors with rapid-rate transcranial magnetic stimulation’,Neurology,41, pp. 697–702
Pascual-Leone A., Vallas-Sole, Brasil-Neto, J. P., Cammarota, A., Grafman, J. andHallet, M. (1994): ‘Akinesia in Parkinson's disease. II. Effects of subthreshold repetitive transcranial motor cortex stimulation’,Neurology,44, pp. 892–898
Plevnik, S. (1984): ‘Electrical therapy’, Clinical Gynecologic Urology, The C. V. Mosby Company, pp. 462–474
Plevnik S. andJanez, J. (1979): ‘Maximal electrical stimulation for urinary incontinence’,Urology,14, pp. 638–646
Plevnik, S., Janez, J., Vrtacnic P. et al. (1986): ‘Short-term electrical stimulation home treatment for urinary incontinence’,World J. Urol.,4, pp. 24–26
Polson, M. J. R., Barker, A. T. andFreeston, I. L. (1982): ‘Stimulation of nerve trunks with time varying magnetic fields’,Med. Biol. Eng. Comput.,20, pp. 243–244
Reilly, J. P. (1989): ‘Peripheral nerve stimulation by induced electric currents: Exposure to time-varying magnetic fields’,Med. Biol. Eng. Comput.,27, pp. 101–110
Reilly, J. P. (1991): ‘Maghetic field excitation of peripheral nerves and the heart: a comparison of thresholds’,Med. Biol. Eng. Comput.,29, pp. 571–579
Roth, B. J. andBasser, P. J. (1990): ‘A model of the stimulation of a nerve fiber by electromagnetic introduction’,IEEE Trans. Biomed. Eng.,37, pp. 588–597
Thüroff W. J., Bazeed, A. M., Schmidt, A. R., Wiggin, M. D. andTanagho, A. R. (1982): ‘Functional pattern of sacral root stimulation in dogs. II. Urethral closure’,J. Urol.,127, pp. 1034–1038
Wolfgang, K. H. andPanofsky, M. P. (1964): ‘The wave equation and plane waves. Classical electricity and magnetism’ (Addison-Wesley, Inc.) p. 201
Yamanishi, T., Yasuda, K., Sakakibara R., Hattori, T., Ito, H. andMurakami, S. (1997): ‘Pelvic floor electrical stimulation in the treatment of stress incontinence: An investigational study and a placebo-controlled double blind trial’,J. Urol.,158, pp. 2127–2131
About this article
Cite this article
Ishikawa, N., Suda, S., Sasaki, T. et al. Development of a non-invasive treatment system for urinary incontinence using a functional continuous magnetic stimulator (FCMS). Med. Biol. Eng. Comput. 36, 704 (1998). https://doi.org/10.1007/BF02518872
- Urinary incontinence
- Stress incontinence
- Urge incontinence
- Urethral closure
- Continuous stimulation
- Magnetic stimulation
- Eddy current
- Low power