Editing Urinary catheterization (section)

==Catheter types==
Catheters come in several basic designs:<ref name=Hanno>{{cite book |vauthors = Hanno PM, Wein AJ, Malkowicz SB |title=Clinical manual of urology |publisher=[[McGraw-Hill Professional]] |year=2001 |page=78}}</ref>
*A [[Foley catheter]] ([[indwelling urinary catheter]]) is retained by means of a balloon at the tip that is inflated with sterile water. The balloons typically come in two different sizes: 5&nbsp;cm<sup>3</sup> and 30&nbsp;cm<sup>3</sup>. They are commonly made in silicone rubber or natural rubber.
*An intermittent catheter/Robinson catheter is a flexible catheter that is removed after each use. Unlike the Foley catheter, it has no balloon on its tip and therefore cannot stay in place unaided. These can be non-coated or coated (e.g., [[hydrophilic]] coated and ready to use).
*A coudé catheter, including Tiemann's catheter, is designed with a curved tip that makes it easier to pass through the curvature of the prostatic urethra.<ref>{{cite book|title=Urology: Problems in Primary Care|author=Elroy D. Kursh|publisher=Medical Economics Books|year=1987|isbn=9780874894196}}</ref>
*A [[hematuria]] catheter is a type of Foley catheter used for Post-TURP [[hemostasis]]. This is useful following endoscopic surgical procedures, or in the case of gross hematuria. There are both two-way and three-way hematuria catheters (double and triple lumen).<ref name=Hanno/>
*A [[External urine collection devices|condom catheter]] can be used by males and carries a lower risk of infection than an indwelling catheter.<ref>{{cite book |first=Mary Ann |last=Black| name-list-style = vanc |title=Medical nursing |publisher=Springhouse Corp |edition=2nd |year=1994 |page=97 |isbn=0-87434-738-6 |location=Springhouse, Pa. |lccn=94035389}}</ref>

Catheter diameters are sized by the [[French catheter scale]] (F). The most common sizes are 10&nbsp;F (3.3mm) to 28&nbsp;F (9.3mm). The clinician selects a size large enough to allow free flow of urine, and large enough to control leakage of urine around the catheter. A larger size is necessary when the urine is thick, bloody, or contains large amounts of [[sediment]]. Larger catheters, however, are more likely to damage the urethra. Some people develop allergies or sensitivities to latex after long-term latex catheter use making it necessary to use silicone or Teflon types.{{citation needed|date=October 2014}}

Evidence does not support an important decrease in the risk of [[urinary tract infections]] when silver-alloy catheters are used.<ref name=Lam2014>{{cite journal | vauthors = Lam TB, Omar MI, Fisher E, Gillies K, MacLennan S | title = Types of indwelling urethral catheters for short-term catheterisation in hospitalised adults | journal = Cochrane Database Syst Rev | issue = 9 | pages = CD004013 | date = September 2014 | pmid = 25248140 | doi = 10.1002/14651858.CD004013.pub4 | pmc = 11197149 }}</ref>