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A bioresorbable stent is a tube-like device that is used to open and widen clogged heart arteries and then dissolves or is absorbed by the body. It is made from a material that can release a drug to prevent scar tissue growth. It can also restore normal vessel function and avoid long-term complications of metal stents. [1] [2]
Endoscopic stenting is a medical procedure by which a stent, a hollow device designed to prevent constriction or collapse of a tubular organ, is inserted by endoscopy.They are usually inserted when a disease process has led to narrowing or obstruction of the organ in question, such as the esophagus or the colon.
However, the stent has not completely done away with restenosis after angioplasty, and improved procedures continue to be sought. The drug-eluting stent, which releases chemicals that inhibit restenosis, has shown marked success and seems to be replacing the bare-metal stent in America, though Europeans have resisted the change due to the expense.
Coronary stents are placed during a coronary angioplasty.The most common use for coronary stents is in the coronary arteries, into which a bare-metal stent, a drug-eluting stent, a bioabsorbable stent, a dual-therapy stent (combination of both drug and bioengineered stent), or occasionally a covered stent is inserted.
For some high-risk cardiovascular patients with stents, the often-recommended practice of prolonged taking of aspirin might be ineffective, and in some cases, even harmful, a new study found.
Hypaque or other water-soluble dye may be placed through the passage to ensure patency of the stent on fluoroscopy. [15] Enteric and colonic SEMS are inserted in a similar fashion, but in the duodenum and colon respectively. [16] Biliary SEMS are used to palliatively treat tumours of the pancreas or bile duct that obstruct the common bile duct.
Glomerular filtration will only remove those drugs or metabolites that are not bound to proteins present in blood plasma (free fraction) and many other types of drugs (such as the organic acids) are actively secreted. In the proximal and distal convoluted tubules, non-ionised acids and weak bases are reabsorbed both actively and passively. Weak ...
A catheter and guidewire is moved up into the common bile duct. A sphincterotome can then enlarge the ampulla of Vater and release the stones. [107] Later, the endoscopist can place a stent in the common bile duct to soften any remaining stones and allow for bile drainage. If needed, a balloon catheter is available to remove any leftover stones ...
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