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Coronary stents are placed during a percutaneous coronary intervention procedure, also known as an angioplasty. |
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Ureteral stents are used to ensure the patency of a ureter, which may be compromised, for example, by a kidney stone. This method is sometimes used as a temporary measure, to prevent damage to a blocked kidney, until a procedure to remove the stone can be performed. Indwelling times of 12 months or longer are indicated to hold ureters open, which are compressed by tumors in the neighbourhood of the ureter or by tumors of the ureter itself. In many cases these tumors are inoperable and the stents are used to ensure drainage of urine through the ureter. If drainage is compromised for longer periods, the kidney can be damaged. The main complications with ureteral stents are dislocation, infection and blockage by encrustation. Recently stents with coatings (e.g. heparin) were approved to reduce infection, encrustation and therefore stent exchanges. | |||||||
A urethral or Prostatic stent might be needed if a man is unable to urinate. Often this situation occurs when an enlarged prostate pushes against the urethra, blocking the flow of urine. The placement of a stent can open the obstruction. Recent scientific breakthroughs have now meant using a Prostatic stent is a viable method of dis-obstructing the prostate. Stents can be temporary or permanent. Temporary stents can be placed in the Urologist's office in a manner similar to placing a Foley catheter taking less than 10 minutes and using only Lidocaine jelly. Clinical results show the temporary stent is effective and well tolerated. Permanent stents are mostly placed on an outpatient basis under local or spinal anesthesia and usually take about 30 minutes. Clinical results show occurrences of migration, painful wearing and difficult removal. |
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Prostatic/sphinchter stents can be used for draining the bladder in patient with urethra obstruction, or nerve damages to the nerves controlling the bladder. Stents could be placed in the prostate, across the outer and inner sphinchter to achieve a good drainage of the bladder. The patient will need to use diapers, incontinence pants/plastic pants, or a external collection device (external catheter) to collect the urine. | |||||
Esophageal stent | |||||||
Biliary stent, providing bile drainage | |||||||
A stent graft is a tubular device, which is composed of special fabric supported by a rigid structure, usually metal. The rigid structure is called a stent. An average stent on its own has no covering, and therefore is usually just a metal mesh. Although there are many types of stent, these stents are used mainly for vascular intervention. |
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The device is used primarily in endovascular surgery. Stent grafts are used to support weak points in arteries, such a point commonly known as an aneurysm. Stent grafts are most commonly used in the repair of an abdominal aortic aneurysm, in a procedure called an EVAR. The theory behind the procedure is that once in place inside the aorta, the stent graft acts as a false lumen for blood to travel through, instead of flowing into the aneurysm sack. |
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Stent grafts are also commonly placed within grafts and fistulas used for dialysis. These accesses can become obstructed over time, or develop aneurysms similar to other blood vessels in the body. A stent graft can be used in either situation to create an open lumen and prevent blood from flowing outside it. | |||
Other types of stents include Duodenal Stents, Colonic Stents, and Pancreatic Stents |
Category:Implants Category:Interventional radiology
de:Stent es:Stent (dispositivo) fi:Stentti fr:Stent he:סטנט is:Stoðnet it:Stent ja:ステント ku:Stent nl:Stent no:Stent pl:Stent pt:Stent ru:Стент sr:Стент sv:Stent tr:Stent zh:支架This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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