Deep Brain Stimulation of NAc/ALIC to Prevent Treatment-Refractory Obsessive Compulsive Disorder

Inclusion Criteria: 1. Diagnosis of OCD following the diagnostic and statistical manual of mental disorders-fourth edition (DSM-IV) criteria for OCD; 2. Duration of illness: min. 5 year; 3. 18 years old \<Age \<60 years old; 4. Severe form of OCD, as evidenced by: a score≥25 on the Y-BOCS, a score \> 4 on the CGI scale, a score≤40 on the GAF ("global assessment of functioning). 5. All patients were lack of response to drug therapy after adequate administration (defined as more than 12 weeks at the maximum tolerated dose) of at least four different medications, lack of response to CBT (Cognitive Behaviour Therapy)over the course of 1 year of therapy or after 20 sessions. 6. Normal cognitive status and ability to understand and comply with instructions for multiple therapies. 7. Good overall health. Exclusion Criteria: 1. Present or past history of psychotic symptoms. 2. Severe personality disorders; 3. Any clinically significant neurological disorder or medical illnesses affect ; 4. brain function, other than motor tics or Gilles de la Tourette syndrome; 5. Patient currently treated with anticoagulant or antiplatelet drug; 6. Patient with contraindication for surgery or anesthesia; 7. Inability to undergo awaked operation; 8. Infection, coagulopathy, significant cardiac or other medical risk factors for surgery; 9. Patient with contraindication for MRI scanning (cardiac pacemaker, pregnancy, metal in body, severe claustrophobia), abnormal brain MRI or serious inter current disease