blood bag has such a big secret!  

Quickly recall your blood donation experience,  Do you know what parts the blood donation bag consists of?  

"Blood donation bag, just a small ordinary bag ~"   believe this is the first reaction of many people.  

In fact, a set of blood collection bags is generally divided into three or four bags.  Triple bags are the most common. Blood is collected into the first bag, the second bag is the red blood cell preservation solution, and the third bag is the transfer bag, which mainly separates the plasma and red blood cells.  The blood collection bag is mainly used for the collection, storage, processing, transfer, separation and infusion of blood and blood components.  

One more question: Why do blood bags need to wiggle when donating blood?  

In fact, as blood flows out of the blood vessels, the body converts dissolved fibrinogen into insoluble fibrin, which leads to blood clotting.  Under normal circumstances, the blood will be completely coagulated within two to eight minutes after leaving the body.  

In order to prevent blood coagulation donated by blood donors, the blood collection bag will be placed on the tray of the electronic blood collection scale during blood collection. During blood collection, the blood flows to the plastic blood collection bag, and the weighing tray of the electronic blood collection scale placed on the blood collection bag will swing continuously at a certain Angle and frequency, so that the anticoagulant and blood can be fully mixed, so as to avoid blood coagulation.  

The perfect combination of anticoagulant and electronic blood collection scale, which is why the blood in the collection bag does not clot!