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In [[medicine]], a '''catheter''' (
In most uses, a catheter is a thin, flexible tube (''soft'' catheter) though catheters are available in varying levels of stiffness depending on the application. A catheter left inside the body, either temporarily or permanently, may be referred to as an "indwelling catheter" (for example, a [[peripherally inserted central catheter]]). A permanently inserted catheter may be referred to as a "permcath" (originally a trademark).
Catheters can be inserted into a body cavity, duct, or vessel, brain, skin or adipose tissue. Functionally, they allow drainage, administration of fluids or gases, access by surgical instruments, and also perform a wide variety of other tasks depending on the type of catheter.<ref>{{cite book |last=Diggery |first=Robert |title=Catheters: Types, applications and potential complications (medical devices and equipment |year=2012 |publisher=Nova Science |isbn=978-1621006305}}</ref> Special types of catheters, also called probes, are used in preclinical or clinical research for sampling of lipophilic and hydrophilic compounds,<ref>{{Cite journal|last1=Altendorfer-Kroath|first1=Thomas|last2=Schimek|first2=Denise|last3=Eberl|first3=Anita|last4=Rauter|first4=Günther|last5=Ratzer|first5=Maria|last6=Raml|first6=Reingard|last7=Sinner|first7=Frank|last8=Birngruber|first8=Thomas|date=January 2019|title=Comparison of cerebral Open Flow Microperfusion and Microdialysis when sampling small lipophilic and small hydrophilic substances|url=http://dx.doi.org/10.1016/j.jneumeth.2018.09.024|journal=Journal of Neuroscience Methods|volume=311|pages=394–401|doi=10.1016/j.jneumeth.2018.09.024|pmid=30266621|s2cid=52883354|issn=0165-0270}}</ref> protein-bound and unbound drugs,<ref>{{Cite journal|last1=Schaupp|first1=L.|last2=Ellmerer|first2=M.|last3=Brunner|first3=G. A.|last4=Wutte|first4=A.|last5=Sendlhofer|first5=G.|last6=Trajanoski|first6=Z.|last7=Skrabal|first7=F.|last8=Pieber|first8=T. R.|last9=Wach|first9=P.|authorlink8= Thomas Pieber|date=1999-02-01|title=Direct access to interstitial fluid in adipose tissue in humans by use of open-flow microperfusion|url=http://dx.doi.org/10.1152/ajpendo.1999.276.2.e401|journal=American Journal of Physiology. Endocrinology and Metabolism|volume=276|issue=2|pages=E401–E408|doi=10.1152/ajpendo.1999.276.2.e401|pmid=9950802|issn=0193-1849}}</ref><ref>{{Cite journal|last1=Ellmerer|first1=Martin|last2=Schaupp|first2=Lukas|last3=Brunner|first3=Gernot A.|last4=Sendlhofer|first4=Gerald|last5=Wutte|first5=Andrea|last6=Wach|first6=Paul|last7=Pieber|first7=Thomas R.|date=2000-02-01|title=Measurement of interstitial albumin in human skeletal muscle and adipose tissue by open-flow microperfusion|url=http://dx.doi.org/10.1152/ajpendo.2000.278.2.e352|journal=American Journal of Physiology. Endocrinology and Metabolism|volume=278|issue=2|pages=E352–E356|doi=10.1152/ajpendo.2000.278.2.e352|pmid=10662720|s2cid=11616153 |issn=0193-1849}}</ref> neurotransmitters, peptides and proteins, antibodies,<ref>{{Cite journal|last1=Dragatin|first1=Christian|last2=Polus|first2=Florine|last3=Bodenlenz|first3=Manfred|last4=Calonder|first4=Claudio|last5=Aigner|first5=Birgit|last6=Tiffner|first6=Katrin Irene|last7=Mader|first7=Julia Katharina|last8=Ratzer|first8=Maria|last9=Woessner|first9=Ralph|last10=Pieber|first10=Thomas Rudolf|last11=Cheng|first11=Yi|date=2015-11-23|title=Secukinumab distributes into dermal interstitial fluid of psoriasis patients as demonstrated by open flow microperfusion
==Etymology==
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==Uses==
[[File:In line suction catheter placement in ventilator circuit.png|thumb|In-line suction catheter used in ventilator circuit for delivering air into lungs]]
[[Image:Urinary catheter.JPG|thumb|Single-use urinary catheter, 40 cm]]
Placement of a catheter into a particular part of the body may allow:
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Ancient Chinese used onion stalks, the Romans, Hindus, and Greeks used tubes of wood or precious metals.<ref>{{cite web |url=https://www.mdtmag.com/blog/2015/06/medtech-memoirs-catheters |title=MedTech Memoirs: Catheters |date=16 June 2015 |publisher=Advantage Business Media |url-status=live |archive-url=https://web.archive.org/web/20171024160847/https://www.mdtmag.com/blog/2015/06/medtech-memoirs-catheters |archive-date=24 October 2017 }}</ref>
The ancient
===Modern===
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According to a footnote in his letter in Volume 4 of the Papers of Benjamin Franklin (1959), Franklin credits Francesco Roncelli-Pardino from 1720 as the inventor of a flexible catheter. In fact, Franklin claims the flexible catheter may have been designed even earlier.<ref>{{cite journal |author=Huth, E.J. |title=Benjamin Franklin's place in the history of medicine |journal=Journal of the Royal College of Physicians of Edinburgh |volume=37 |issue=4 |year=2007 |pages=373–8 |pmid=18447203 |url=http://www.rcpe.ac.uk/journal/issue/journal_37_4/Huth.pdf}}</ref>
An early modern application of the catheter was employed by [[Claude Bernard]] for the purpose of cardiac catheterization in 1844. The procedure involved entering a horse's ventricles via the jugular vein and carotid artery
In 1929, [[Werner Forssmann|Werner Forssman]] first performed [[Central venous catheter|central venous catheterization]],<ref name=":0">{{Cite journal |last1=Smith |first1=Reston N. |last2=Nolan |first2=Jerry P. |date=2013-11-11 |title=Central venous catheters |url=https://www.bmj.com/content/347/bmj.f6570 |journal=BMJ |language=en |volume=347 |pages=f6570 |doi=10.1136/bmj.f6570 |issn=1756-1833 |pmid=24217269|s2cid=16939469 }}</ref> work which led to the development of [[Cardiac catheterization|cardiac catherization]] as a treatment, for which he, [[André Frédéric Cournand|André F. Cournand]] and [[Dickinson W. Richards]] would win the [[Nobel Prize in Physiology or Medicine|Nobel Prize for Medicine]] in 1959.<ref>{{Cite web |title=The Nobel Prize in Physiology or Medicine 1956 |url=https://www.nobelprize.org/prizes/medicine/1956/forssmann/biographical/ |access-date=2023-07-16 |website=NobelPrize.org |language=en-US}}</ref> Central venous catheterization allows for continuous administration of medications, fluids and blood products to a large vein, particularly in critically ill patients.<ref name=":0" /> Cardiac catheterization is the insertion of a catheter into one of the chambers of the heart, which is used for imaging, diagnosis, and the placement of devices such as stents.<ref>{{Citation |last1=Manda |first1=Yugandhar R. |title=Cardiac Catheterization Risks and Complications |date=2023 |url=http://www.ncbi.nlm.nih.gov/books/NBK531461/ |work=StatPearls |access-date=2023-07-16 |place=Treasure Island (FL) |publisher=StatPearls Publishing |pmid=30285356 |last2=Baradhi |first2=Krishna M.}}</ref>
[[David S. Sheridan]] invented the modern disposable catheter in the 1940s.<ref name=WaPo>{{Cite news|url=https://www.washingtonpost.com/archive/local/2004/05/07/david-s-sheridan-catheter-p/4c6fb678-2d14-43f3-be53-734f2ae0a191/|title=David S. Sheridan|date=2004-05-07|newspaper=Washington Post}}</ref> Prior to this, some reusable catheters consisted of braided cotton tubes, which were varnished, heat-treated and polished. As these were primarily produced in France, the advent of [[World War II]] threatened the supply chain.<ref>{{cite web|url=https://www.latimes.com/archives/la-xpm-2004-may-04-me-sheridan4-story.html|title=David Sheridan, 95; Dropout Invented Key Medical Device|date=May 4, 2004|website=Los Angeles Times}}</ref>▼
▲[[David S. Sheridan]] invented the modern disposable catheter in the 1940s.<ref name=WaPo>{{Cite news|url=https://www.washingtonpost.com/archive/local/2004/05/07/david-s-sheridan-catheter-p/4c6fb678-2d14-43f3-be53-734f2ae0a191/|title=David S. Sheridan|date=2004-05-07|newspaper=Washington Post}}</ref> Prior to this, some reusable catheters consisted of braided cotton tubes, which were varnished, heat-treated and polished. As these were primarily produced in France, the advent of [[World War II]] threatened the supply chain.<ref>{{cite web|url=https://www.latimes.com/archives/la-xpm-2004-may-04-me-sheridan4-story.html|title=David Sheridan, 95; Dropout Invented Key Medical Device|date=May 4, 2004|website=Los Angeles Times}}</ref> Sheridan was dubbed the "Catheter King" by ''[[Forbes (magazine)|Forbes]]'' magazine in 1988. He also invented the modern "disposable" plastic [[endotracheal tube]] now used routinely in surgery.<ref name="WaPo" />
Other reusable catheters consisted of red rubber tubes. Although sterilized prior to reuse, they still posed a high risk of infection and often led to the spread of disease.<ref>{{Cite book |last=Engineers |first=NPCS Board of Consultants & |url=https://books.google.com/books?id=XwWJAgAAQBAJ&q=david+S.+Sheridan+Forbes+Magazine&pg=PA142 |title=Handbook on Medical and Surgical Disposable Products
To prevent [[clotting]], catheters that are not in use may be filled with [[catheter lock solution]].<ref>{{Cite journal |last1=Vanholder |first1=R. |last2=Canaud |first2=B. |last3=Fluck |first3=R. |last4=Jadoul |first4=M. |last5=Labriola |first5=L. |last6=Marti-Monros |first6=A. |last7=Tordoir |first7=J. |last8=Van Biesen |first8=W. |year=2010 |title=Diagnosis, prevention and treatment of haemodialysis catheter-related bloodstream infections (CRBSI): a position statement of European Renal Best Practice (ERBP) |journal=NDT Plus |volume=3 |issue=3 |pages=234–246 |doi=10.1093/ndtplus/sfq041 |pmc=6371390 |pmid=30792802}}</ref>
==Materials==
===Urinary catheters===
A range of [[polymer]]s are used for the construction of catheters, including [[silicone rubber]], [[nylon]], [[polyurethane]], polyethylene terephthalate (PET), [[latex]], and [[thermoplastic elastomer]]s. Silicone is one of the most common implantable choice because it is inert and unreactive to body fluids and a range of medical fluids with which it might come into contact. On the other hand, the polymer is weak mechanically, and a number of serious fractures have occurred in catheters.<ref>{{Cite journal |last1=McKenzie |first1=J. M. |last2=Flahiff |first2=C. M. |last3=Nelson |first3=C. L. |date=1 October 1993 |title=Retention and strength of silicone-rubber catheters. A report of five cases of retention and analysis of catheter strength. |url=http://jbjs.org/content/75/10/1505 |journal=J Bone Joint Surg Am |language=en |volume=75 |issue=10 |pages=1505–1507 |doi=10.2106/00004623-199310000-00011 |issn=0021-9355 |pmid=8408139 |url-status=dead |archive-url=https://web.archive.org/web/20160923221049/http://jbjs.org/content/75/10/1505 |archive-date=September 23, 2016 |access-date=May 12, 2016 }}</ref><ref>{{Cite journal |last1=Agarwal |first1=Shaleen |last2=Gandhi |first2=Mamatha |last3=Kashyap |first3=Randeep |last4=Liebman |first4=Scott |date=1 March 2011 |title=Spontaneous Rupture of a Silicone Peritoneal Dialysis Catheter Presenting Outflow Failure and Peritonitis |url=https://journals.sagepub.com/doi/abs/10.3747/pdi.2010.00123 |journal=Peritoneal Dialysis International |language=en |volume=31 |issue=2 |pages=204–206 |doi=10.3747/pdi.2010.00123 |doi-broken-date=
===Catheters used in interventional procedures===
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===Diagnostic catheters===
There are various catheters used in [[angiography]] procedures. Diagnostic catheters<ref name="Ali 2012"/><ref name="Themes 2016">{{cite web|last=Themes|first=U. F. O.|date=2016-06-20|title=Catheter-Based Technology and Devices|url=https://thoracickey.com/catheter-based-technology-and-devices/|access-date=2021-08-15|website=Thoracic Key|language=en-US}}</ref> direct wires through blood vessels. [[Radiocontrast agent]] is then injected through the catheter to visualise the vessels via various imaging methods such as [[computed tomography]] (CT), [[projectional radiography]], and [[fluoroscopy]].<ref name="Themes 2016"/> Pigtail catheter is a non-selective catheter with multiple side holes that can deliver large volumes of contrast into a blood vessel for imaging purposes.<ref name="Davies 2005"/> Cobra catheter is a selective catheter used to catheterise downgoing vessels in the abdomen. Cobra catheters move forward by pushing and are removed by pulling.<ref>{{cite web |last1=Bakal |first1=CW |last2=Flacke |first2=S |title=Diagnostic Catheters and Guidewires |date=December 23, 2015 |url=https://radiologykey.com/diagnostic-catheters-and-guidewires/ |publisher=Radiology Key |access-date=3 February 2022 |archive-url=https://archive.today/20220203112342/https://radiologykey.com/diagnostic-catheters-and-guidewires/ |archive-date=3 February 2022}}</ref> Sidewinder catheter is a selective catheter is used to navigate the aorta.<ref name="Davies 2005">{{cite book |last1=Davies |first1=AH |last2=Brophy |first2=CM |title=Vascular surgery |date=10 October 2005 |publisher=Springer Science & Business Media |isbn=9781852332884 |page=239 |url=https://books.google.com/books?id=s_FcvqJvmhsC&pg=PA239 |access-date=3 February 2022}}</ref> Headhunter, Newton, Simmons, Bentson, and Berenstein catheters are used to navigate the into one of the three branches of the [[arch of aorta]].<ref>{{cite web |title=Angiography peripheral intervention |url=https://www.merit.com/wp-content/uploads/2014/09/PI-Angiography.pdf |publisher=Merit Medical |access-date=4 February 2022 |archive-url=https://web.archive.org/web/20210414170251/https://www.merit.com/wp-content/uploads/2014/09/PI-Angiography.pdf |archive-date=
===Balloon catheters===
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===Dialysis catheters===
{{Main|Dialysis catheter}}
There is no difference in achieving adequacy of blood flow, period of catheter usage, infection, and thromboembolism risk whether the dialysis catheter has step-tip, split-tip, or symmetrical tip.<ref name="pmid30905366">{{cite journal | vauthors = Ling XC, Lu HP, Loh EW, Lin YK, Li YS, Lin CH, Ko YC, Wu MY, Lin YF, Tam KW | title = A systematic review and meta-analysis of the comparison of performance among step-tip, split-tip, and symmetrical-tip hemodialysis catheters | journal = Journal of Vascular Surgery | volume = 69 | issue = 4 | pages = 1282–1292 | date = April 2019 | pmid = 30905366 | doi = 10.1016/j.jvs.2018.09.029 | s2cid = 85497739 | url = | doi-access = free }}</ref> Palidrome catheter is superior to Permcath catheter in terms of maximum blood flow, dialysis adequacy, and annual patency rate. Similar to Permcath, Palidrome catheter has high infection and [[thromboembolism]] rate.<ref name="pmid24685735">{{cite journal | vauthors = Li M, Zhang Z, Yu Y, Chen H, Li X, Ma J, Dong Z | title = Clinical application of long-term Palindrome catheter in hemodialysis patients | journal = Iranian Journal of Kidney Diseases | volume = 8 | issue = 2 | pages = 123–9 | date = March 2014 | pmid = 24685735 | doi = | url = }}</ref>
==Adverse effects==
In interventional procedures, Teflon catheters (which are hydrophobic) have higher risk of thrombus formation when compared to polyurethene catheters. The longer the duration of the catheter left inside the body, the higher the risk of thrombus formation. Larger catheters increase the risk of thrombus formation around the catheter, because they can block the flow of blood.<ref>{{Cite journal |last1=Formanek |first1=Gustave |last2=Frech |first2=Robert S. |last3=Amplatz |first3=Kurt |date=May 1970 |title=Arterial Thrombus Formation During Clinical Percutaneous Catheterization |journal=Circulation |language=en |volume=41 |issue=5 |pages=833–839 |doi=10.1161/01.CIR.41.5.833 |issn=0009-7322|doi-access=free |pmid=5444526 }}</ref>
"Any foreign object in the body carries an infection risk, and a catheter can serve as a superhighway for bacteria to enter the bloodstream or body", according to Milisa Manojlovich, a professor at the University of Michigan School of Nursing.<ref>{{cite web |title=Catheters: Big source of infection, but often overlooked |date=July 1, 2019 |author=Laura Bailey |publisher=[[University of Michigan]] |url=https://news.umich.edu/catheters-big-source-of-infection-but-often-overlooked |access-date=February 16, 2020}}</ref>
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* [[Jejunostomy]]
* [[Stent]]
* [[Catheter lock solution]]
==References==
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