Knowledge about Vacuum Blood Tube
Blood collection and test is a normal test method. Although simple, it also contains questions. Today, let's take a brief look at vacuum blood tubes.
The vacuum blood tube was invented in 1937 and began to circulate in Europe and America in 1943. In the 1990s, it was gradually popularized and used in China. Before this, syringes were widely used by medical personnel all over the world for intravenous blood collection. The invention of vacuum blood tubes greatly improves the safety and preservation of blood collection.
Vacuum blood tubes can be divided into two categories. One is hard connection blood collection, the other is soft connection blood collection. The difference lies in the blood collection needle. The former is a hard connected blood collection needle, which needs a needle holder; The latter is the soft connection, which only needs a soft connection blood sampling needle. Because nurses are easy to operate and relatively cheap, the soft connection is widely used in China.
The principle of a vacuum blood tube is the pressure difference. Blood flows from the vessel with higher pressure to the vacuum blood collection vessel with lower pressure, which is similar to the concept of "water flows to a lower place". At ordinary times, a vacuum blood tube is not a complete vacuum, but a partial vacuum. In the production process, the manufacturer will draw away part of the air to form a certain negative pressure.
As a popular example, the vacuum blood tube should be filled with 3 ml of blood, so three units of air will be pumped out during production to ensure that the blood volume is within the required range; If you require 5 ml of blood, draw 5 units of air, and so on.
Searching for a vacuum blood tubes supplier, wholesaler, manufacturer from China, you can get high-quality products at a nice price.