Safety and Effectiveness Evaluation of the ISS System in Treatment of Acute Ischemic Stroke

Inclusion Criteria: 1. Age: ≥ 18 years and ≤ 85 of both genders 2. Patients with symptoms and signs of an acute ischemic hemispheric stroke within the anterior circulation. 3. NIHSS ≥ 7 and ≤ 20 4. Treatment can be initiated within the first 24 hours following stroke onset or since last seen normal. 5. Signed informed consent has been obtained from the patient him/herself or his/her legally authorized representative Exclusion Criteria: 1. Time interval since onset of symptoms undetermined 2. Treatment with ISS500 System can't start within the first 24 hours post stroke onset 3. Any other imaging diagnosis including tumor, abscess, primary intracranial hemorrhage (ICH) or secondary hemorrhage (PH1-PH2) (H1 and H2 are allowed); or symptoms suspicious for sub-arachnoid hemorrhage, etc 4. Clinical syndrome of an acute stroke due to lacunar infarct (pure motor hemiparesis, ataxic hemiparesis, sensorimotor stroke), unless brain imaging demonstrates a relevant lesion \> 1.5 cm in size 5. Not a stroke in the anterior circulation 6. Minor stroke with non-disabling deficit or rapidly improving neurological symptoms with a high probably to Transient Ischemic Attack (TIA) 7. Eligible to or treated with IV or IA t-PA or mechanical thrombolysis 8. Baseline NIHSS \>20 or \< 7 9. Neurological deficit that has led to stupor or coma (NIHSS level of consciousness score greater than or equal to 2) 10. History of stroke in previous 6 months 11. Pre-existing disability; Modified Rankin Score \> 2 upon screening 12. Patients under oral anticoagulants or having received heparin within 48 hours, and / or with elevated activated partial thromboplastin time (aPTT) (or INR) 13. High clinical suspicion of septic embolus 14. Severe cardiac disease: evidence of congestive heart failure or has history of endstage cardiovascular disease (e.g. CHF NYHA Class III or IV or unstable angina) 15. Uncontrolled hypertension upon enrollment (systolic \>185 mmHg and/or diastolic \>110 mmHg) 16. Serious systemic infection 17. Women known to be pregnant or having a positive or indeterminate pregnancy test 18. Patients with other implanted neural stimulator 19. Orthodontics or non-Hygienic condition/ problems that prevent procedures within the mouth 20. MRI2 contraindications, such as but not limited to: * Central nervous system aneurysm clips * Implanted cardiac pacemaker or defibrillator; * Cochlear implant * Ocular foreign body (e.g. metal shavings) * Insulin pump * Metal shrapnel or bullet * Any implanted device that is incompatible with MRI. * Patients with a condition precluding entry into the scanner (e.g. morbid obesity, claustrophobia, etc.) 21. Life expectancy \< 1 year from other causes 22. Currently participating in any other clinical trial 23. Patients unable or unwilling to follow protocol requirements 24. Massive stroke, defined as acute parenchymal hypodense lesion or effacement of cerebral sulci in over a 2/3 of the MCA territory per CT (or equivalent per T2/Flair/DWI MRI)