Novel bipolar electromagnetic excitation system

Abstract

The invention provides a novel bipolar electromagnetic excitation system. The novel bipolar electromagnetic excitation system comprises a power supply and at least two electromagnetic excitation groups, wherein each electromagnetic excitation group comprises an electronic switch K and an inductive load, the power supply, the electronic switch K and the inductive load are connected in series, the power supply is used for supplying power to the electromagnetic excitation group, the electronic switch K is used for achieving control on a current change rate in the inductive load so as to ignore the influence of a charge-discharge parameter of a circuit on the current change rate, and directions of N poles and S poles of a magnetic field generated by the inductive loads of all electromagnetic excitation groups have two opposite situations with regard to the same target region of a nerve. The scheme of the invention has the main improvement points in two places that 1, the parameter of a charge-discharge circuit is abandoned in the scheme, and the discharge time and the discharge rate of the inductive load are adjusted by adjusting the disconnection rate of the electronic switch K; and 2, a plurality of electromagnetic excitation groups are employed in the scheme, and the directions of the N poles and the S poles of the inductive loads in the electromagnetic excitation groups have two opposite situations.

Description

technical field [0001] The invention relates to the field of electromagnetic excitation, in particular to a novel bipolar electromagnetic excitation system. Background technique [0002] A typical application of transient electromagnetic fields in medicine is a technique called Transcranial Magnetic Stimulation (TMS). TMS is a form of electrodeless stimulation, which uses an excitation coil to generate a time-varying magnetic field to induce a current in the target tissue to stimulate excitable tissue. When current flows through the TMS excitation coil, a time-varying magnetic field will be generated around it. This strong and rapidly changing magnetic field can penetrate human skin and skull and other tissues. The ability to stimulate nerves was first discovered by D’Arsonval in 1896 when he observed the phenomenon of magneto-induced flashes, and for a long time thereafter, magnetic stimulation research was limited to magneto-induced flashes. Brickford et al. observed ske...

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 power consumption of the hardware circuit of the excitation system is large, and it is difficult to realize, which in turn makes it difficult to realize multi-channel, and there are great safety hazards, especially in the medical field. Application security is an important issue that cannot be ignored

[0004] Aiming at the problems of high power consumption and safety, the invention patent with the authorized announcement number CN102614592B proposes the working method of replacing the traditional high current with small current. Although this method overcomes the problems of power consumption and safety, for small current design, electronic The switching rate is used to ignore the load parameters. For switching devices, the turn-off time in actual use cannot reach the turn-off time under ideal experimental conditions. For the same switch, when the load inductance is different, the turn-off time is also different. For The same load inductance, using different switches, the turn-off time is also different

In actual use, too fast turn-on and turn-off is unfavorable in the case of inductive loads

In this case, if the switch is turned off too quickly, a peak voltage with a high frequency, a large amplitude, and a narrow pulse width will be generated in the circuit. Using a peak absorption circuit can effectively suppress the generated high-voltage pulse peak to protect the system. However, based on the small current itself with small amplitude and narrow pulse, coupled with the excessively fast turn-off of the switch, the discharge time is relatively short, and the transient electromagnetic field generated by it is not long enough to stimulate the cerebral cortex. Stimulation feedback, this scheme has great limitations in medical efficacy due to the problem of insufficient stimulation time

[0005] And in the scheme of stimulating with small current pulses in the prior art, for example, in claim 1 of the invention patent with the authorized announcement number CN102614592B, only the unidirectional change of the falling edge is provided

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