2 different technology of shock wave

Now as we know the shockwave technology is so popular recently. For treating joint pain has begun to replace the traditional drugs treatment. It can avoid the impact of drugs.

And for the shock wave machine, there are 2 different kinds of technology. I will introduce them to you as follows.

One technology is the electromagnetic shock wave. The is below showing. When high voltage coil contact electricity, then it will generate a pulsed magnetic field. Push the metal diaphragm to shock in water, producing the shock waves.

And the other principle is below showing: pneumatic pulse sound waves that are generated by the compressor is converted into precise ballistic shock, then drive the bullet inside the body handle, make the bullet to impact the treatment place in pulse mode.