Why doesn't the doctor bleed when he cuts the skin?

This problem is actually a misunderstanding of operation. It is impossible to cut the skin without bleeding during the operation. This is just a quantitative difference. In some areas with dense blood vessels, the instantaneous bleeding caused by skin incision is much greater than that caused by the so-called "slight scratch by sharp objects in life". Skin bleeding is the smallest part of most operations. Some tumor operations near large blood vessels can even lead to blood spraying. Ordinary people can't see these scenes, so they don't know what the operation process is like.

Before the operation officially begins, the surgeon will give the patient local anesthesia. Epinephrine will be added when injecting anesthetic, which is a powerful heroic drug that athletes are forbidden to take. At the same time, subcutaneous injection of water will make the blood vessels around the incision contract sharply and it is not easy to bleed.

Blood stays in our veins. In order to reduce skin bleeding, doctors will cut the skin with a knife where blood vessels are scarce. In this way, there is no blood flow without blood vessels. We don't know where there are blood vessels and where there are no blood vessels, but doctors have been doing this work all the year round and naturally know where the operation is most suitable. The development of medical science and technology also makes surgical medical instruments more perfect. The electrotome or bipolar electrocoagulation used in the operation can generate heat when the skin is cut, so that the skin tissue can be quickly separated and solidified, thus reducing the amount of bleeding, just like the water pipe is cut off.

In many operations, doctors don't cut the skin directly at first. They do it layer by layer. We should also know that human skin is divided into several layers, and the tools used to cut the skin also have the function of stopping bleeding. When cutting, it will inhibit blood overflow, so the amount of bleeding is less. These are some reasons why skin won't bleed when cutting.