Neuromuscular electric stimulator and its electrode impedance detection device and method

Abstract

The invention discloses a neuromuscular electrical stimulator and an electrode impedance detection device and method thereof. The electrode impedance detection method of the neuromuscular electrical stimulator comprises the following steps: a program control module outputs an enablement level and a preset voltage to a current control module in a first preset time; the current control module controls a transformer to output a preset current; the program control module outputs the enablement level to a voltage sampling module in a second preset time; the voltage sampling module collects primary voltage of the transformer and outputs the voltage to the program control module; and the program control module calculates output voltage and electrode impedance of the transformer according to the preset voltage, the collected primary voltage of the transformer and the turn ratio of the transformer. The method can quantitatively detect the electrode output voltage value and electrode impedance during the period of outputting a single stimulus pulse, so that electrode shedding degree can be accurately judged, output of electric stimulation is stopped in time according to the preset threshold value, and the purpose of protecting patients effectively is achieved.

Description

technical field [0001] The invention relates to the field of biofeedback rehabilitation treatment instruments, in particular to a neuromuscular electric stimulator and an electrode impedance detection device and method thereof. Background technique [0002] With the improvement of people's economic level and quality of life, biofeedback rehabilitation products (such as stroke, neurological impairment, urinary incontinence and female postpartum rehabilitation, etc.) are getting more and more attention. The performance requirements of products are also getting higher and higher. Neuromuscular electrical stimulation is a technical method commonly used in biofeedback rehabilitation products, and the accuracy and timeliness of detection of stimulation electrode detachment is an important indicator related to the safety and ease of use of this type of product. [0003] The current commonly used electrode impedance detection method is to use the constant current output feedback co...

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Problems solved by technology

[0003] The current commonly used electrode impedance detection method is to use the constant current output feedback control loop to indirectly detect the load impedance (the sum of the skin contact impedance and the stimulated tissue impedance), but it does not quantitatively detect the impedance value, but through constant current The open and closed loop state of the feedback control is used to judge whether the stimulating electrode falls off. This kind of judgment method is too simple and rough, and can only detect the situation when the electrode impedance is very large (or infinite), but the actual situation is when the electrode impedance increases to a certain value. To a certain extent, due to the feedback mechanism of constant current control, a larger stimulation output voltage is applied between the electrode sheet and the skin to maintain the constant current characteristics, and the increase in electrode impedance is generally accompanied by a decrease in the contact area between the stimulation electrode and the skin. , which causes an increase in the current density flowing through the skin, which already produces a tingling sensation or even a skin burn to the patient

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