Extracorporeal Filtration of Subarachnoid Hemorrhage Via Spinal Catheter

Inclusion Criteria: * Age: 18 years or older * Informed consent by the patient or his/her legally authorized representative * Modified Fisher Grade 2, 3, or 4 * Hunt \& Hess I-III * First aneurysmal SAH that has been confirmed by Angio, CTA or MRA * Patient is ≤ 48 hours post bleeding event * World Federation of Neurosurgeons (WFNS) Grades I-IV and those Grade V patients who improve to Grade IV or less after ventriculostomy. Exclusion Criteria: * Patients with a SAH due to mycotic aneurysm or AV malformation * Patients who present with an acute MI or unstable angina * Patients with uncontrolled diabetes * Patients who present with a creatinine \> 2.0mg/dl * Imaging demonstrates supratentorial mass lesions greater than 50 cc * Imaging demonstrates more than 5 mm of mid-line-shift associated with infarction and or edema * Effacement of the basilar cisterns (suprasellar, ambient, chiasmatic and quadrageminal) * Vasospasm on admission as defined by angiographic evidence * Patients with a coagulopathy that cannot be reversed per the professional discretion of the investigator * Thrombocytopenia def. platelet count \< 100,000 * Patients on low molecular weight heparin e.g., Lovenox * Patients on Clopidogrel bisulfate (Plavix) or other chronic platelet inhibitors * Patients with a documented history of cirrhosis * Patients who will be managed with supportive care rather than intervention * Obstructive hydrocephalus i.e., non-communicating * Pregnancy * History of posterior fusion hardware that would interfere with placement of the catheter * Pre-existing Lumbar Drain * Local skin infections or eruptions over the puncture site * Signs of systemic infection/sepsis or pneumonia * Lumbar puncture within 6 hours * Concurrent participation in another study which is not observational or retrospective in nature without prior approval from the Sponsor