A study of the characteristics of single-injection insulated block needles in a biologic model

Regional Anesthesia and Pain Medicine
Anand M SardesaiA William Harrop-Griffiths

Abstract

Single-injection block needles are manufactured in many different lengths, diameters, and tip designs, but the literature contains no reports of methods to assess clinical characteristics of regional-block needles. A novel animal model for the assessment of the characteristics of single-injection regional anesthesia needles is described. Nine different needles designed for peripheral nerve blocks that were fitted with identical hubs were used. Pork bellies were used as the biologic model. The bellies were mounted such that the needles passed from inside to outside. The last layer to be penetrated was the skin. Ten experienced and blinded anesthesiologists scored the feel, resistance, and usability of the 9 needles during their passage through similarly prepared pork bellies. Two identical (index) needles were included in the study to assess the internal validity of the study. The overall scoring was acceptably consistent and repeatable and showed statistically significant differences between the needles tested. The needles that were judged the most usable were those with a moderate resistance to passage through the tissue and a high degree of feel, which was defined as the ability to appreciate the passage of the needle through...Continue Reading

References

Apr 1, 1989·Journal of Biomedical Materials Research·M R AbidinR F Edlich
Jan 1, 1989·Annals of Emergency Medicine·M R AbidinR F Edlich
Mar 1, 1989·American Journal of Surgery·J G ThackerR F Edlich

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