Noncutting needles encounter high puncture resistance due to their blunt tips. To prevent damage to tissues, it is recommended that an introducer be used to secure insertion of the non-cutting needle while decreasing tissue damage.
The introducer can also decrease the risk of needle breakage and help prevent erroneous insertion, especially for fine needles of 25G or less.
However, if the introducer is not correctly inserted, the tip of pencil point needle may pass through the spinal canal.