Electrode array nonpolar constant current electrical stimulation circuit

Abstract

The invention discloses an electrode array nonpolar constant current electrical stimulation circuit, which is characterized in that the circuit comprises an H bridge circuit module, a high-voltage generation module, a power supply control module, a microcontroller and an electrode array. Through the H bridge circuit formed by photoelectric silicon controlled rectifiers, isolation of a low-voltage circuit and a high-voltage circuit can be realized conveniently; through an electrode switching switch formed by photoelectric bidirectional silicon controlled rectifiers, control of isolation of the low-voltage circuit and the high-voltage circuit is realized conveniently, and the bidirectional silicon controlled rectifiers can enable a nonpolar stimulation current to be loaded to a human body; through the combination of one electrode and two switches, any group of electrode can be selected and powered up, thereby providing rich stimulation sites and stimulation modes; only one wire is needed for connecting each electrode in array electrodes with the circuit, thereby simplifying electrode connection mode and facilitating expanding more electrodes; and control of the photoelectric bidirectional silicon controlled rectifiers is realized by a serial-to-parallel data chip 74HC595, thereby saving ports of a microcontroller and facilitating expanding.

Description

technical field [0001] The invention relates to the technical field of electrical stimulation for the purpose of treatment. Background technique [0002] Neuromuscular electrical stimulation is widely used in the fields of clinical rehabilitation and physical therapy. Electrode array electrical stimulation is a new neuromuscular electrical stimulation technology, which provides more options for stimulation sites, stimulation combination methods, and motor function control. , for the best stimulation mode. Electrode array electrical stimulation needs to control many stimulation sites, and the combination of stimulation sites is diverse. It is required that non-polar stimulation current can be loaded on any set of electrodes. In general, the impedance of the human body is about 1 000 to 3 000Ω. If the stimulation current is 10mA, a power supply of at least 30V is required. In the current constant current electric stimulator, the power supply is generally about 100V to ensure ...

AI Technical Summary

Problems solved by technology

There are literatures that use optocoupler isolation circuit to select the stimulation site. Due to the unidirectional conductivity of the phototransistor in the optocoupler element, it is not suitable for non-polar electrical stimulation, and the combination of stimulation sites is single.

In some patents, the analog switch CD4052 is used to select the stimulation channel. Since the CD4052 cannot withstand the high voltage of 100V, it is not suitable for neuromuscular electrical stimulation, and it has no isolation function, so it is not easy to control

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