Research Studies

All eligible subjects presenting to any participating study site will be considered for enrollment. Up to 1000 patients; 18 and ; 75 years presenting with ruptured saccular aneurysms who meet all eligibility criteria will be enrolled.

1. Subject is ≥ 18 and ≤ 75 years of age. 2. Subject has a previously untreated, ruptured saccular intracranial aneurysm 2- 14mm in diameter for which the clinical decision to treat with hydrogel coil embolization has been made independent of the decision to participate in the study described in this protocol. 3. Subject has a baseline Hunt and Hess Score of I, II, or III. 4. Subject or subject’s legally authorized representative has provided written informed consent. 5. Subject must be considered by the treating physician to be available for and able to complete all followup visits. 6. Subject has not been previously entered into this study.