The doctor holds a syringe and manually generates the force to push the medicine, and only one point can be injected at a time; The injection dose of each needle is determined manually by the doctor, which is rough and inaccurate, and it is difficult to operate with a small injection amount; Needles with different thicknesses and lengths can be selected.
The biggest controversy is "medicine leakage" between machine beating and hand beating. The general view is that "machine beating leaks medicine, but hand beating does not leak". However, the fact is that this is a question that depends on the skill of doctors. No matter how you fight, no matter who fights, "drug leakage" is an inevitable problem. It is impossible not to leak at all, but how to improve the utilization rate of drugs and reduce the waste of drugs.
If the doctor has enough experience in the properties of water-light drugs and the water-light instruments used, and can adjust the parameters appropriately for different skin, then the situation of drug leakage from the machine can be very few. Moreover, in recent years, the design of a new generation of water photometer has been improved, and the problem of drug leakage has been solved. If doctors have no experience in judging the nature of water-light drugs and the nature of patients' skin, that is, using hands to fight, there will still be a lot of drugs missing.
However, if a patient with a large number of pockmarks and pockmarks meets an inexperienced doctor, he will lightly hit the skin in order to make a so-called "bulge". In this way, because there are a large number of dense fibers on the surface of the skin (the essence of pockmarks and pockmarks is scars), the needle is difficult to prick and the drug pushing resistance is great. The skin can't be propped up by drugs, and drugs can't enter the skin, so they can only leak out along the eye of a needle. Drug leakage is more serious than mechanical punching.