8-shaped coil transcranial magnetic stimulation system based on magnetic resonant coupling principle

Abstract

The invention provides an 8-shaped coil transcranial magnetic stimulation system based on a magnetic resonant coupling principle. A first stimulation coil and a second stimulation coil of the system are externally tangent to each other. The inner diameter of each of the first stimulation coil and the second stimulation coil is 56mm, and the outer diameter of each of the first stimulation coil and the second stimulation coil is 62mm. A first source coil is internally tangent to the first stimulation coil, and a second source coil is internally tangent to the second stimulation coil. The two internally-tangent points are superposed with the externally-tangent point between the first stimulation coil and the second stimulation coil. The inner diameter of the first source coil and the inner diameter of the second source coil are 30mm, and the outer diameter of the first source coil and the inner diameter of the second source coil are 36mm. The discharging current directions of the middle points of the central connecting lines of the two coil units are consistent, and the middle points are corresponding to the target position simulation points. The 8-shaped coil transcranial magnetic stimulation system is advantageous in that when the system source coil is provided with the current having the same intensity, the stimulation intensity of the affected parts having the same depth in the cranium can be increased; the utilization rate of the energy transmitted from the source coils to the cranium model can be increased by more than three times; when the energy utilization efficiency is increased and the excitation current strength is reduced, the stimulation intensity can be increased, and the stimulation accuracy of the target positions can be increased.

Description

technical field [0001] The invention relates to biomedical engineering technology, in particular to an 8-shaped coil transcranial magnetic stimulation system based on the magnetic resonance coupling principle. Background technique [0002] Transcranial magnetic stimulation (TMS) is a new type of diagnosis and treatment technology based on the principle of electromagnetic induction, which can stimulate human tissues non-invasively and painlessly. It is a relatively safe and effective non-invasive stimulation method. It uses a magnetic coil placed above the scalp to generate a time-varying magnetic field, and then induces an induced electric field in the cerebral cortex and the neural tissue inside the brain, generating an induced current, thereby stimulating the corresponding brain nerve unit, affecting brain metabolism and neural activity. The most common coil structure designed based on TMS technology is the 8-shaped coil, that is, two single coils (or multi-turn coils) are...

AI Technical Summary

Problems solved by technology

[0004] However, there are still some problems with this technology, the most prominent of which is the contradiction between the degree of focus of traditional figure-of-eight coil stimulation, the control of stimulation intensity, and the stimulation efficiency.

The degree of focus of the coil determines the range of magnetic stimulation. Enhancing the focus of the coil can reduce the possibility of non-target tissue neurons being stimulated, reduce the side effects of the treatment process, and improve safety; the intensity of stimulation will affect the depth of magnetic stimulation. , a greater stimulation depth is a necessary condition for deep cranial nerve tissue stimulation; while stimulation efficiency affects energy consumption, applicable power range, and thus affects the popularity of the device

As a common stimulation source configuration of TMS, the traditional 8-shaped coil has the advantage that it can improve the stimulation focus, but the penetration depth of stimulation is reduced, and the stimulation efficiency is low. High power and high current are not conducive to the stimulation of TMS. household

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