FACTOID # 3: South Carolina has the highest rate of violent crimes and aggravated assaults per capita among US states.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Stent" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Stent
Endoscopic image of self-expanding metallic stent in esophagus, which was used to palliatively treat esophageal cancer.
Endoscopic image of self-expanding metallic stent in esophagus, which was used to palliatively treat esophageal cancer.
Endoscopic image of biliary stent seen protruding from ampulla of Vater at the time of duodenoscopy
Endoscopic image of biliary stent seen protruding from ampulla of Vater at the time of duodenoscopy

In medicine, a stent is either an expandable wire form or perforated tube (conventionally perforated by means of laser cutting) that is inserted into a natural conduit of the body to prevent or counteract a disease-induced localized flow constriction. Image File history File linksMetadata SEMS_endo. ... Image File history File linksMetadata SEMS_endo. ... Endoscopic still of esophageal ulcers seen after banding of esophageal varices, at time of esophagogastroduodenosocopy In medicine (gastroenterology), esophagogastroduodenoscopy is a diagnostic endoscopic procedure that visualises the upper part of the gastrointestinal tract up to the duodenum. ... The esophagus (also spelled oesophagus/Å“sophagus), or gullet is the muscular tube in vertebrates through which ingested food passes from the mouth area to the stomach. ... Palliative care (from Latin palliare, to cloak) is any form of medical care or treatment that concentrates on reducing the severity of the symptoms of a disease or slows its progress rather than providing a cure. ... Esophageal cancer is malignancy of the esophagus. ... Image File history File links Biliary_stent_endo. ... Image File history File links Biliary_stent_endo. ... The Ampulla of Vater is the part of the duodenum where the common bile duct empties into the second part of the duodenum, so named because it has the appearance of an ampulla. ... Medicine is the branch of health science and the sector of public life concerned with maintaining or restoring human health through the study, diagnosis, treatment and possible prevention of disease and injury. ...

Contents

Uses

The main purpose of a stent is to overcome important decreases in vessel or duct diameter. Stents are often used to diminish pressure differences in blood flow to organs beyond an obstruction in order to maintain an adequate delivery of oxygen. Although perhaps the most popular use of stents is linked to the coronary arteries, they are widely used in several other structures, such as peripheral arteries and veins, bile ducts, esophagus, colon, trachea or large bronchi, ureters, and urethra. General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Atomic mass 15. ... The coronary circulation consists of the blood vessels that supply blood to, and remove blood from, the heart. ... Section of an artery An artery or arterial is also a class of highway. ... In biology, a vein is a blood vessel which carries blood toward the heart. ... X-Ray of the bile duct during a laprascopic cholecystectomy A bile duct is any of a number of long tube-like structures that carry bile. ... The esophagus (also spelled oesophagus/Å“sophagus), or gullet is the muscular tube in vertebrates through which ingested food passes from the mouth area to the stomach. ... In anatomy of the digestive system, the colon, also called the large intestine or large bowel, is the part of the intestine from the cecum (caecum in British English) to the rectum. ... Windpipe redirects here. ... A bronchus (plural bronchi, adjective bronchial) is a caliber of airway in the respiratory tract that conducts air into the lungs. ... Transverse section of ureter. ... Female anatomy In anatomy, the urethra is a tube which connects the urinary bladder to the outside of the body. ...


Problems

One of the weak points of vascular stents, however, is the development of a thick smooth muscle tissue inside the lumen, the so-called neointima. Development of a neointima is variable but can at times be so severe as to re-occlude the vessel lumen (restenosis), especially in the case of smaller diameter vessels, which often results in reintervention. Thus, there is a strong body of research focusing on the reduction of neointima after stent placement. Considerable improvements have been made, including the use of more bio-compatible materials, anti-inflammatory drug-eluting stents, resorbable stents, and others. Fortunately, even if stents are eventually covered by neointima, the minimally invasive nature of their deployment makes reintervention possible and usually straightforward. Smooth muscle is a type of non-striated muscle, found within the walls of hollow organs; such as blood vessels, the bladder, the uterus, and the gastrointestinal tract. ... artery anatomy, showing lumen The lumen is the interior of a vessel within the body, such as the small central space in an artery or vein, or any of their relating vessels through which blood flows. ... Restenosis literally means the reoccurrence of stenosis. ... An example of a drug-eluting stent. ...


Etymology

The origin of the word stent remains a matter of debate. The verb stenting was used for centuries for the process of stiffening garments (a usage long obsolete, per the OED) and some believe this to be the origin. Others attribute the noun stent to the English dentist Charles Stent (18071885), who invented a dental impression compound. The full account is described in the Journal of the History of Dentistry, which states: "The earliest use of the word 'stent' to describe this item was in 1916, when a Dutch plastic surgeon described how he used a dental impression compound as a matrix around which to form tissue in the process of rebuilding a shattered face." [1] Thus, according to the author, from the use of Stent's compound as support for facial tissues grew the eventual use of stent to open various bodily structures as described above. OED stands for Oxford English Dictionary Office of Enrollment & Discipline This page concerning a three-letter acronym or abbreviation is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... In the nineteenth century the principal dental impression materials were bees wax and plaster of Paris. ... 1807 was a common year starting on Thursday (see link for calendar). ... 1885 (MDCCCLXXXV) is a common year starting on Thursday. ...


See also

Angioplasty is the mechanical, hydraulic dilation of a narrowed or totally obstructed arterial lumen, generally caused by atheroma (the lesion of atherosclerosis). ... In medicine, bronchoscopy is the visualization of the lower airways using a flexible or rigid endoscope. ... Colonoscopy is the minimally invasive endoscopic examination of the large colon and the distal part of the small bowel with a fiber optic camera on a flexible tube passed through the anus. ... Endoscopic still of esophageal ulcers seen after banding of esophageal varices, at time of esophagogastroduodenosocopy In medicine (gastroenterology), esophagogastroduodenoscopy is a diagnostic endoscopic procedure that visualises the upper part of the gastrointestinal tract up to the duodenum. ... Some rubber grommets. ... Restenosis literally means the reoccurrence of stenosis. ...

External links

Wikimedia Commons has media related to:

  Results from FactBites:
 
Gene Therapy: Encyclopedia of Medicine (4479 words)
In this procedure, a stent (in this case, a type of tubular scaffolding) is used to open the clogged artery.
However, in response to the trauma of the stent insertion, the body initiates a natural healing process that produces too many cells in the artery and results in restenosis, or reclosing of the artery.
The gene therapy approach to preventing this unwanted side effect is to cover the outside of the stents with a soluble gel.
Radiohead - Wikipedia, the free encyclopedia (5523 words)
On the initial sessions, the band chose to work with Mark "Spike" Stent instead of their longtime co-producer Nigel Godrich.
This spirit of creative collaboration is also shown in the band's close relationship with their producers, in particular Nigel Godrich, who worked with the band as coproducer on OK Computer and the following three albums after serving as an engineer on the recording of The Bends.
Graphic artist Stanley Donwood is another long-term associate of the group, having produced together with Yorke (who is often listed under the pseudonym "Tchock","Tchocky", "Dr. Tchock", or "The White Chocolate Farm") all of Radiohead's visual artwork (except music videos) since their My Iron Lung EP.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m