Spinal Needle with Introducer Needle 

Quinke Point Spinal Needle with Introducer and Stylet / Pencil Point Spinal Needle with Introducer and Stylet.

Spinal needles vary in their design, usually regarding the tip geometry, but are fundamentally similar and usually come with a stylet and introducer needle. Larger spinal needles may not require an introducer.

Introducer needle is A needle that is placed into the interspinous space before placement of the spinal needle through it in an attempt to guide the smaller-gauge needle, which is likely to bend during insertion through soft tissue.

Spinal needles are used to inject analgesia and/or anesthetic directly into the CSF usually at a point below the second lumbar vertebra. Spinal needles enter the cerebral spinal fluid (CSF) through the membranes surrounding the spinal cord. An introducer needle is used in some cases to stabilize the insertion of the needle and aid insertion through tough skin.

The needle and stylet are advanced towards the dura in the intervertebral space (the stylet stops tissue blocking the needle during insertion). An introducer needle is used in some cases to stabilize the insertion of the needle. Once through the dura and in position, the introducer is removed and the removal of the stylet enables CSF to flow into the needle hub. CSF can be collected for diagnostic purposes or a syringe may be connected to the spinal needle to inject anesthetic agents or chemotherapy agents.