1, safety: Measures two class water light needle requires a high degree of security, need to pass strict testing and approval procedures to ensure that it is safe and harmless to the human body; Measures three class water light needle is the highest level of medical devices, involving more complex technology and higher risk, so the security requirements are extremely strict.
2, effectiveness: the mechanical class II hydrazine need to prove its effectiveness, that is, to achieve the expected therapeutic or diagnostic effect; mechanical class III hydrazine need to prove its effectiveness, but because it involves a higher level of technology and risk, so the effectiveness of the proof of the more complex and stringent.
3, the scope of use: armored two types of water light needle can be used for micro-needle skin-breaking, direct rolling coating; armored three types of water light needle can be used with a hand needle or Demartha machine to play in, is the basis of water light.