[An "atraumatic" universal needle for single-shot regional anesthesia: clinical results and a 6 year trial in over 30,000 regional anesthesias].

The so-called "atraumatic" needle was developed by modification of two essential features of the Whitacre Spinal needle. The new atraumatic needle tip is universally suitable for all single-shot techniques of regional anesthesia. This is the result of a 6-year test period with 34,950 applications of 24- and 22-Gauge needles in spinal anesthesia, diagnostic lumbar puncture, peridural anesthesia, plexus anesthesia, peripheral nerve blocks with a Teflon-coated version (unipolar electrostimulation), and lumbar sympathetic and celiac plexus blocks. Postspinal headache was observed following 0.02% of punctures for anesthetic or diagnostic purposes. Transient monosymptomatic nerve damage occurred in 1 case after axillary block (0.009%). No permanent neurological sequelae were observed due to vascular, neural, or dural lesions. In comparison, 10 cases of persistent traumatic nerve damage were reported to be caused by conventional needles during the last decade. An analysis of these cases reveals some reasons for underestimating the risk of neurological sequelae after regional anesthesia. The routine clinical use of this type of atraumatic needle revealed no disadvantages with regard to efficacy of nerve blocks or training of anesthetists. Due to the extremely low incidence of postspinal headache, this needle has been used for spinal therapy and diagnostic lumbar punctures in outpatient pain therapy for 2 years. As of this time, the overall risk of outpatient lumbar puncture cannot be estimated. Our experience should encourage further controlled studies to evaluate criteria for excluding those patients unsuited for outpatient spinal anesthesia and lumbar puncture.