It is a device used to penetrate the dura to take CSF sample before injecting the drugs used for spinal anesthesia for cesarean section.

It is a device used to penetrate the dura to take CSF sample before injecting the drugs used for spinal anesthesia for cesarean section.

It is a spinal needle with 'QUINCKE' Bevel. It is inserted in the lumbar region at the inter-space L4-L5, L4-L3 ,or L3-L2 lumber spaces, while the patient is put in the sitting position then CSF sample is taken then 2.5 ml of a local anesthetic(0.5 ml of 25 ug fentanyl and 2 ml of 8 mg heavy bupivacaine) is given intrathecal then the needle is withdrawn.

After insertion of an intravenous line 4 ml serum will be collected, then 0.5 ml CSF sample will be collected after insertion of the dura by the selected spinal needle before injecting the anesthetic drugs used for spinal anesthesia. Beta trace protein assay will be measured through ELISA technique in both CSF and serum samples and the ratio will be calculated and measured. This ratio will be measured for the three arms aiming at the comparison between the three devices regarding the CSF : Serum ratio.