An intracranial aneurysm is an abnormal expansion of the intracranial artery under increased hemodynamic load and other factors caused by local damage of the blood vessel wall due to congenital abnormality or acquired injury. It can occur in people at any age and is common in people aged 40-60, but with significant regional and ethnic differences. The intracranial aneurysm prevalence in the Asian population ranges from 2.5% to 3.0% as shown in a transarterial cerebral angiography study.
Endovascular coil embolization can be used to treat all patients with intracranial aneurysms, except for those with severe arteriosclerosis, vasospasm, or in severe emergencies where the patient cannot be treated with embolization. Endovascular coil embolization is intended to separate the aneurysm from normal blood circulation without obstructing any of the peripheral arterioles or narrowing the main vessels. The instruments used for endovascular coil embolization mainly include embolization coils, intracranial aneurysm stents and vascular reconstruction devices .