Medical device costs. The coil system is a medical device for intracranial aneurysm embolization. The coil system is filled into the aneurysm cavity through a microcatheter to prevent the aneurysm from rupturing and bleeding again. It is the cost of the medical device. Coils In 1991, Guglielmi et al first reported GDC embolization for the treatment of intracranial aneurysms.