Spring coils are the main equipment of interventional technology, but also very important equipment in the treatment of bleeding disorders, such as a variety of traumatic injuries or spontaneous rupture of blood vessels, vascular dilatation of the formation of aneurysms in the blockage, occlusion, to achieve the purpose of hemostasis or prevention of bleeding. Spring coils are usually metal materials, such as nickel-titanium alloy, chromium alloy and other metal materials to support, very soft metal spring type, very small, different lengths, so as to occlude the aneurysm or block the bleeding blood vessels, to achieve the purpose of hemostasis. Clinically can be used to save lives, generally treating emergency bleeding, the most common clinical brain hemorrhage is cerebral aneurysm embolization, now not only limited to cerebral aneurysm, all parts of the body of small aneurysms and vascular malformations, acute gastrointestinal tract, acute other parts of the hemorrhage, such as biopsy puncture, puncture of the bleeding kidney parts of the embolization. The material used for spring coils is compatible with human tissues, that is, human tissues have no allergic reaction or rejection reaction to the material used for spring coils, and the spring coils are permanent in human tissues or blood vessels, and they are not taken out after a long period of time. Once the spring coil is put in place to treat aneurysms or stop bleeding, it is permanent and lifelong, and the material is very safe, just like the material used for metal nails in tissue joint or bone surgery. The spring coils are very safe, and although they remain in the body permanently, they generally do not have abnormal or specific harmful reactions.