B.C. Tsui, V.H. Ip British Journal of Anaesthesia

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Catheter-over-needle method reduces risk of perineural catheter dislocation B.C. Tsui, V.H. Ip British Journal of Anaesthesia Volume 112, Issue 4, Pages 759-760 (April 2014) DOI: 10.1093/bja/aeu066 Copyright © 2014 The Author(s) Terms and Conditions

Fig 1 (a) Schematic drawing comparing the catheter-through-needle (top) and catheter-over-needle (bottom) designs for perineural catheter insertion. In the catheter-through-needle design, the diameter of the needle puncture hole is larger than the diameter of the catheter, leaving space for local anaesthetic to leak upon injection. In the catheter-over-needle design, the puncture hole is has a smaller diameter than the catheter, and the catheter is held tightly by the surrounding skin. (b) Photos of the catheter-through-needle (top) and catheter-over-needle (bottom) assemblies showing detail of the needle/catheter tips. British Journal of Anaesthesia 2014 112, 759-760DOI: (10.1093/bja/aeu066) Copyright © 2014 The Author(s) Terms and Conditions