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Transient electromagnetic field excitation system for transcranial magnetic stimulation (TMS) in medical field

A technology of excitation system and electromagnetic field, which is applied in the field of medical instruments, can solve problems such as the difficulty in realizing the hardware circuit of the excitation system, the large drive current of the excitation system, and the large pulse width, so as to reduce the current amplitude, overcome the difficulties in implementation, and reduce the nerve stimulation effect. Effect

Active Publication Date: 2015-02-04
刘冀成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain sufficient electromagnetic field strength, the drive current of the excitation system is large, the pulse width is large, the hardware circuit of the excitation system is difficult to realize, and there are great safety hazards, especially the application safety in the medical field is an important issue that cannot be ignored.

Method used

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  • Transient electromagnetic field excitation system for transcranial magnetic stimulation (TMS) in medical field
  • Transient electromagnetic field excitation system for transcranial magnetic stimulation (TMS) in medical field
  • Transient electromagnetic field excitation system for transcranial magnetic stimulation (TMS) in medical field

Examples

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Effect test

Embodiment 1

[0034] The structure of the transient electromagnetic field excitation system in this example is as figure 2 As shown, the power supply device in this example is a DC power supply VDC, and its output voltage can be passed through the control device ( figure 1 (Not shown in)) to adjust the charging voltage to change the excitation current amplitude of the excitation coil L. figure 2 The semiconductor switching device K constitutes the charging switch of this example, and the control pole P of the semiconductor switching device K is connected to the control device, which can control the charging and discharging time (frequency) of the excitation coil L and adjust the excitation current amplitude of the excitation coil L. figure 2 The middle resistor R4, the diode D3 and the capacitor C2 constitute the absorption circuit of the semiconductor switching device K. The discharge resistor R1 and the discharge diode D1 are connected in series and connected in parallel at both ends of th...

Embodiment 2

[0039] In this example, the transient electromagnetic field excitation system uses the discharge of the capacitor to excite the excitation coil. Its circuit structure is as follows Figure 4 Shown. The charging circuit of this example includes a current-limiting resistor R0, a charging capacitor C, and a charging switch K1, and the discharging circuit includes a discharging switch K2, an excitation coil L, and a discharging resistor R. The power supply device VDC is connected to the charging capacitor C through the charging switch K1, and the voltage of the charging capacitor C can be controlled by controlling the output voltage of the power supply device VDC and / or the on-time of the charging switch K1. Figure 4 Among them, the charging capacitor C is connected to the excitation coil L through the discharge switch K2, and the discharge switch K2 and the discharge resistor R are connected in series with the excitation coil L. In this example, the charging switch K1 and the disc...

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Abstract

The invention relates to a medical instrument and discloses a transient electromagnetic field excitation system for transcranial magnetic stimulation (TMS) in the medical field, which aims at overcoming the defect that an excitation system in the prior art is large in drive current, large in pulse width, difficult in achieving a hardware circuit of the excitation system and large in hidden safety dangers. The technical scheme is that the transient electromagnetic field excitation system for TMS in the medical field comprises a power supply device, an excitation coil, a charging circuit, a discharging circuit and a control device. The power supply device is connected with the charging circuit and supplies charging current for the charging circuit. The discharging circuit is connected with the excitation coil and supplies a discharge path for the excitation coil. The control device is used for controlling startup and shutdown of the charging circuit and the discharging circuit. The transient electromagnetic field excitation system for TMS in the medical field is characterized by generating a transient electromagnetic field meeting requirements around the excitation coil by increasing current change rate to reduce magnitude of current. The technical scheme of the transient electromagnetic field excitation system for TMS in the medical field is used in the TMS excitation system, is capable of reducing complexity level of system structure, and improves system safety.

Description

Technical field [0001] The present invention relates to a medical instrument, in particular to an electromagnetic field transcranial magnetic stimulation (Transcranial Magnetic Stimulation, TMS) technology using transient electromagnetic fields for nerve stimulation. Background technique [0002] Transient electromagnetic field is a kind of changing electromagnetic field, which is widely used in industrial fields, such as metal detection and mineral resource detection. They all use the instantaneous change of the current in the excitation coil to generate pulsed electromagnetic waves (called primary electromagnetic field, or primary field). Under the excitation of the primary electromagnetic field, the inside of the measured object will generate an induced current that changes with time due to electromagnetic induction. The current excites a secondary electromagnetic field (or secondary field) in the surrounding space, and this secondary electromagnetic field is related to the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61N2/04
Inventor 刘冀成
Owner 刘冀成
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