A novel technique of endovascular treatment for the cerebral aneurysm:the development of covered stent specially designed for intracranial vasculature

Although endosacular embolization has been widely used for the treatment of intracranial aneurysm,it has some limitations in nature.The Willis covered stent specially designed for intracranial vasculature,which has excellent flexibility and can easily be navigated to the distal internal carotid artery,may avoid endosaccular manipulation and exclude aneurysm from circulation,and finally promote endosacular thrombosis.The efficacy of the covered stent for the treatment of pseudoaneurysm below C5 segment of the ICA has been accepted.For some complex aneurysms located at the other site,such as giant aneurysm,dissection or dissecting aneurysm and recurrent aneurysm after coiling,the Willis covered stent provides an alternative to the established endovascular and neurosurgical technique.When the covered stent is attempted to use in intracranial vasculature,the extremely tortuous parent artery is a contraindication,the ostium of perforating artery,especially the anterior choroidal artery and ophthalmic artery,should be prevented from being occluded.The use of the Willis covered stent has thoroughly changed the traditional concept of endovascular treatment for the intracranial aneurysms.The development of the Willis covered stent represents an important advancement in endovascular aneurysm treatment due to its simple manipulation and favorable efficacy.However,a large sample and expandable long-term follow-up are still needed to systemically evaluate the efficacy of the Willis covered stent.