Nerve stimulator circuit based on rapid charge balance in mixed mode

Abstract

The invention discloses a nerve stimulator circuit based on rapid charge balance in a mixed mode. The nerve stimulator circuit comprises a main stimulation part, an electrode short-connecting part anda short current pulse part, the main stimulation part comprises a current source and n pairs of output switches, and each pair of output switches corresponds to an electrode; the electrode short-connecting part comprises n short-connecting switches; and the short current pulse part comprises a window comparator, a control unit, a compensating current unit and n pairs of selective switches, each pair of selective switches corresponds to an electrode, the voltage difference on the electrodes is monitored and compared with safety voltage VW, the output end of the window comparator is connected with the control unit, if the voltage difference exceeds the safety voltage VW, a short current pulse compensating difference value is interpolated, and monitoring and comparing are continued till thevoltage on the electrodes is less than the safety voltage VW. The nerve stimulator circuit can still realize charge balance in a short time, and the situation that charge is accumulated on the electrodes, consequently, the electrodes are electrolyzed, and nervous tissue is damaged is avoided under the situation of one-way large current stimulation or asymmetric two-way large current stimulation.

Description

technical field [0001] The invention belongs to the field of circuit technology, and relates to a mixed-mode rapid charge balance method, which can be used in a multi-channel high-current neural stimulator circuit such as a spinal nerve stimulator circuit, in particular to a mixed-mode rapid charge balance nerve stimulation method circuit. Background technique [0002] Functional neurostimulation is the treatment of nerve tissue by applying electrical charges through conductive electrodes. Examples of practical applications include cochlear implants for hearing problems, visual prosthetics for vision problems, muscle stimulators for paralysis, cardiac pacemakers, and deep brain stimulators, among others. [0003] There are two common methods for neurostimulators to transfer electrical charge to neural tissue. Constant current stimulation is the application of a controlled electrical current between a pair of electrodes for a short period of time. Constant voltage stimulat...

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Problems solved by technology

[0005] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of neural stimulator circuit for multi-channel high current based on mixed mode rapid charge balance, it will propose a kind of The rapid charge balance method enables the neural stimulator circuit to achieve charge balance in a short period of time. In the case of unidirectional high-current stimulation or asymmetric bidirectional high-current stimulation, it avoids the accumulation of charges on the electrodes and causes electrode electrolysis and nerve tissue damage. damage

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