Normally, blood coagulates within 2-8 minutes of exiting the body, this is because after the blood flows out of the blood vessels, the dissolved fibrinogen in the body is converted to insoluble fibrin, which leads to the coagulation of the blood. In fact, before the blood is collected, the bag is not empty, but will also contain a chemical called anticoagulant.
This anticoagulant, also known as a blood maintenance solution, contains substances such as citrate, phosphate, glucose, and adenine, configured in certain proportions,which prevents the blood from coagulating and red blood cells destroyed. Since calcium ion is one of the factors that play a key role in the process of blood coagulation, the blood can be preserved in a non-coagulable state by utilizing citrate to combine with calcium ions in the blood to form soluble and non-ionizable calcium citrate, so that calcium in the free state is converted to calcium in the bound state and loses its physiological function.
In order to prevent the blood donors donated blood coagulation, the anticoagulant alone is not enough, in the process of blood collection, the blood collection bag will be placed in the tray of the electronic blood collection scales, in the process of blood collection, the blood flow to the plastic blood collection bag, placed in the blood collection bag of the electronic blood collection scales of the weighing tray will be according to a certain angle, a certain frequency of non-stop rocking, so that the anticoagulant is fully mixed with the blood to achieve the goal of not making blood coagulation. The purpose of this is to prevent the blood from coagulating.
Oscillation preservation platelets can maintain their original good form. Platelets have the shape of a disk when viewed under a microscope, and if they are not preserved in oscillation, they will aggregate and form clumps, which affects their activity and lifespan. Platelets require aerobic metabolism during preservation, which takes in oxygen and releases carbon dioxide. Oscillatory preservation of platelets can increase the permeability of oxygen, so that platelets in the preservation period to reduce the anaerobic state, thereby delaying it due to hypoxia caused by carbon dioxide increases, and the pH value of the decrease.