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Dept. of Medical Engineering Graduate School of East-West Medical Science Power Supply Magnetic Probes Transfer Capacitor Discharge Capacitor Switching Circuit Driver Introduction Acupuncture by Magnetic Stimulations Controller & Driver

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Presentation Transcript
slide1

Dept. of Medical Engineering

Graduate School of East-West Medical Science

Power

Supply

Magnetic

Probes

Transfer

Capacitor

Discharge

Capacitor

Switching

Circuit Driver

Introduction

Acupuncture by Magnetic Stimulations

Controller & Driver

  • Acupuncture, a major treatment method in TCM(Traditional Chinese Medicine), becomes an alternative method for treating pains in western medicine.
  • Electro-acupuncture techniques have been widely used in TCM for more efficient treatments.
  • Acupuncture needles, essential tools for both traditional and electro acupunctures, are very invasive and occasionally unacceptable to very weak patients or children.
  • We introduce a magnetic acupuncture system with which needle-less acupuncture therapy can be performed
  • By applying a very strong magnetic pulse at the vicinity of the human skin, we can induce electric current inside the human body.
  • The induced eddy current has been utilized to stimulate central or peripheral nerves in western medicine.[1]
  • By using specially designed stimulating coils, we can stimulate acupuncture (meridian) points in a non-invasive manner.

Probes

<Fig. 3> The magnetic acupuncture system

  • To generate very strong magnetic fields up to several tesla, we have used a capacitor charge/discharge technique.

Advantages of Magnetic Acupuncture

The magnetic acupuncture method has some advantages over other acupuncture methods.

<Fig. 1> Meridians and acupuncture points

<Fig. 4> The magnetic coil driving circuit

Probe

Current

Magnetic

Probe

  • To feed electric current into discharge capacitors with a small capacity power supply, we have used transfer capacitors. During non-stimulating intervals, the power supply charges the transfer capacitors. After then, the electric charge is transferred to the discharge capacitors.(See fig.5)
  • After multiple charge transfers from the transfer capacitors to the discharge capacitors, the voltage of the discharge capacitor rises up to 2 KV.
  • The switching components are high speed SCRs

Eddy Current

Configuration of the Magnetic Acupuncture System

Acupuncture Point

  • The system is composed of three major parts.
    • Magnetic acupuncture probes to generate time-varying magnetic fields
    • A driving circuit to feed electric current to the probes
    • A control circuit to generate timing signals

<Fig. 2> Eddy current induced by an external magnetic coil

slide2

Dept. of Medical Engineering

Graduate School of East-West Medical Science

0.7

B [T]

0.6

z = -2mm

0.5

0.4

z = -5mm

0.3

z = -10mm

0.2

0.1

0

0

1

2

3

4

5

6

7

8

9

10

x [cm]

Design of Magnetic Acupuncture Probes

  • In fig. 9, the magnetic flux densities along the x-axis at several z-values are shown.

6kV

Transfer

Capacitor

Voltage

  • To stimulate acupuncture points efficiently, small sized loop coils are preferable.
  • It is very difficult to cool the small sized loop coils.
  • In this study, we have used a large loop coil with a magnetic core along the central axis of the loop coil, as shown in fig. 7.

Time

250ms

2kV

Discharge

Capacitor

Voltage

Time

20ms ~ 1s

(1Hz ~ 50Hz)

200ms

2kA

Acupuncture

Coil Current

z

z

Time

y

Magnetic core (m=20000m0)

Coil

x

<Fig. 5> Timing diagrams to control the

driving circuit

<Fig. 9> The magnetic flux densities along the x-axis

2.5mm

32.5mm

5mm

80mm

  • Maximum pulsing frequency
  •  50 Hz
  • Maximum voltage of the discharge capacitor
  •  2 kV
  • Capacitance of the discharge capacitor
  •  100 mF
  • Inductance of the magnetic coils
  •  30 ~ 40 mH
  • Number of pulsing channels

 4 channels

x

10mm

Conclusions

<Fig.7> A schematic diagram of the magnetic acupuncture probe

  • The developed magnetic acupuncture system gives the localized stimulation similarly to the conventional electro acupuncture.
  • Clinical tests will be performed very soon in a Korean traditional medicine hospital and a Chinese traditional medicine hospital.
  • The magnetic acupuncture system is expected to become a complementary tool to the conventional acupuncture techniques.
  • Using a commercial FEM tool, we have analyzed the spatial distribution of the magnetic field produced by the magnetic acupuncture probe.
  • In fig. 8, the magnetic flux density of the probe is shown.

z [cm]

References

  • [1] M.J.R. Polson, A.T. Barker, and I.L. Freeston, "Stimulation of nerve trunks with time varying magnetic fields", Med. Biol. Eng. Comput., Vol. 20, pp.243-244, 1982

<Fig. 6> A photograph of the developed system

<Fig. 8.> Magnetic flux density produced by the magnetic acupuncture probe