A. French catheter guide and needle gauge reference A. French catheter guide and needle gauge reference. (Courtesy Cook Urological.) B. Commonly used scalpel blades. Left to right: no. 10, 11, 12, 15, and 20. No. 10 is the standard surgical blade; no. 11 is useful for incisions into abscesses or to open the skin for placement of large IV devices; no. 12 is designed to open tubular structures; no. 15 is widely used for bedside procedures and for more delicate work; no. 20 is used to make large incisions. Source: Chapter 13. Bedside Procedures, Clinician's Pocket Reference: The Scut Monkey, 11e Citation: Gomella LG, Haist SA. Clinician's Pocket Reference: The Scut Monkey, 11e; 2007 Available at: http://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/gome/gome_c013f001a.gif&sec=43077428&BookID=365&ChapterSecID=43074922&imagename= Accessed: November 07, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved