The principle of three-dimensional dynamic interference current therapy.

(1) Stereo Interference The standard electrode placement method for generating traditional interference current is cross. In three-dimensional space, it only works in two directions: up and down, left and right, up and down, back and forth, or back and forth. Three-dimensional dynamic interference current is called three-dimensional interference, and there are three currents crossing in three dimensions, which act in three directions: up and down, left and right, front and back. There are two patterns in the shape of three-dimensional interference electric field. One is flat mode, which is produced by the cross interference of three groups of currents. Another mode called rotating plane is to rotate the traditional plane interference field around an axis on the plane, thus generating a three-dimensional interference field.

(II) Generation of Dynamic Interference The generation principle of dynamic effect of three-dimensional dynamic interference current is similar to that of traditional dynamic interference current, and the amplitude of intermediate frequency current is also modulated by a triangular wave with a wave width of 10s. Traditional dynamic interference current has only two dynamic modes, while three-dimensional dynamic interference current has more than three dynamic modes.

When the interference field is a flat mode, there are three dynamic modes:

1. The modulation phases of the three groups of currents are the same, that is, the intensities of the three groups of currents increase and decrease simultaneously. Its figure is that the cube shrinks as a whole, then gradually increases, then gradually shrinks and changes back and forth. Equivalent to the dynamic II of the traditional dynamic interference current.

2. Among the three groups of currents, two groups of currents are modulated in reverse phase, and the other group of currents is unmodulated and remains unchanged. Its graph is similar to the dynamic I of traditional dynamic interference current, but it is a three-dimensional graph.

3. Three groups of currents automatically change from large to small, and then from small to large, in turn. At any moment, a group of currents changes from large to small, a group of currents changes from small to large, and the remaining group of currents remains unchanged. In the revolution mode, according to the direction and range of rotation around an axis, there are several dynamic modes to choose from. Generally, it can be divided into 90 rotation,180 rotation and 360 rotation in one direction.

(3) Characteristics of three-dimensional dynamic interference flow

1. Stereoscopic stimulation effect: Three groups of currents intersect in three-dimensional space, which can produce stereoscopic spatial stimulation effect.

2. Multi-site stimulation effect: There are multiple stimulation sites in the range surrounded by six electrodes.

3. Dynamic change of power.

4. Dynamic changes of stimulation site.

Physiological function and therapeutic function The physiological function and therapeutic function of three-dimensional dynamic interference current are basically similar to those of traditional interference current, which has the functions of relieving pain, improving local blood circulation, causing neuromuscular excitement, regulating the function of internal organs, and regulating autonomic nerve function. However, because its intensity and stimulation site are larger than the traditional interference current, it has an effect on three-dimensional space and has a large dynamic change, so it is inferred that its therapeutic effect is stronger than the traditional interference current. But so far, there are few experimental data and clinical observation data. Stereodynamic interference current therapy has positive effects on some diseases. However, there are few data compared with the traditional interference current therapy. In other studies, it was found that although stereoscopic dynamic interference current is similar to intermittent dynamic current in relieving pain and promoting superficial tissue blood circulation. But for deep tissue, the three-dimensional dynamic interference current is obviously stronger than other currents.