Problems with Shenqi spring coils

Poor stability. The use of foreign material between the spring coil and the coil reduces the actual effective number of windings, leading to high stresses that cause them to break. Therefore, the stability of Shenqi spring coils is not good. Spring coils are medical devices used to treat arterial stenosis. Spring coils were first reported in 1991 by Guglielmi et al. GDC embolization for the treatment of intracranial aneurysms.