We already have hemostatic drugs and bandages and other medical supplies, so why use a magnet "bandage?
The reason why blood can clot quickly is that there are platelets in the blood, which can accumulate at the rupture of the blood vessel, block the rupture port, and release some substances that contract blood vessels. However, when patients suffer from hematologic diseases such as leukemia and thrombocytopenia, the use of compression bandaging alone is not effective in stopping bleeding. At this time, supplementing exogenous coagulation factors, such as iron oxide nanoparticles, and then using a magnet "bandage" can successfully stop bleeding. And don't worry about injecting particulate matter into the blood will affect health. In fact, iron atoms are an important component of hemoglobin in the blood, and iron is also one of the minerals we need to supplement daily.