Stent in the treatment of cancer

By | March 29, 2012

Stent technology is the important progress in interventional therapy, the principle is put into the body cavity within the stent to keep the cavity open. In the human body through a variety of stent placement within the cavity can be to expand the narrow lumen and maintain patency. The stent made of stainless steel wire, buttons titanium alloy wire and memory wire made of the town, on the blood vessels, bile duct, urethra, trachea and esophagus and other lumen, through its long-term expansion to keep the lumen open. The most common is sickle memory alloy scaffold. Sickle shape memory alloy has a function, that the stent can change shape, into the human body can be restored in its original form, this stand at low temperature and high temperature conditions showed two forms. Can be made into the desired shape, size, and then make it into a temporary form for anyone to use the catheter, to be set in the human body reaches a certain temperature, then return to its original shape and size. Before the need for surgical treatment of many diseases can now use this approach to treatment, the indication choose the right circumstances, this approach to control the symptoms of certain types of cancer can achieve a multiplier effect. Stent stenosis caused by cancer or obstruction, stent technology in cancer therapy, commonly used in the following areas:
Stent technology in cancer therapy 1. Vena cava syndrome as lung cancer, mediastinal lymph node metastasis or mediastinal tumor compression on the vena cava, causing superior vena cava stenosis, vascular stenosis in here after the head and neck venous return to the heart is not smooth, and there will be head and face edema and congestion, the patient is suffering. In medicine, because the superior vena cava obstruction occurs a phenomenon called the superior vena cava syndrome. Seven for cancer before vena cava syndrome caused mainly by radiation, the slow onset, and if the cancer is not sensitive to radiotherapy, it may not work. Now, you can use within the stent, in the superior vena cava into the stent to the narrow part of the expansion of open, immediate treatment. This treatment significantly reduced the pain.
Stent in the treatment of cancer 2. Esophageal tracheal or esophageal stricture caused by esophageal paralysis esophageal cancer can lead to the continuous growth of esophageal stenosis, esophageal cancer in some patients after surgery for epilepsy surgery because of scar or local recurrence led to anastomotic narrow area, food is not passed, the patient can not eat. Before this occurs, to alleviate the suffering of patients, only surgery or to radiotherapy, the treatment of patients treated for the first time may be effective, but for patients with local recurrence, most patients can not be surgery or radiotherapy. Now with stent implantation, expansion stenosis, can significantly improve or eliminate dysphagia. Very close to the esophagus and trachea, esophagus can be violated to grow around the trachea, or even through the trachea. At this point the esophagus and trachea connected, what goes into the food can enter the airways and lungs, causing a serious cough and lung infection, treatment is very difficult. Now with the stent to esophagus and trachea can be separated naturally solve the problem.
The indications for stenting are: advanced. tracheoesophageal thin. mediastinal esophageal thin. anastomotic stenosis. esophageal or mediastinal tumors after radiotherapy due to esophageal stenosis.
After stent implantation and treatment of common symptoms are as follows: After 1 hour into the liquid food, then gradually transition to the soft texture of the food, fiber and more food should be chewed as much as possible. The majority of patients can have chest discomfort, but can gradually adapt or disappear soon. stent migration occurred rarely in some patients, the majority in this case within 1 month after treatment, need to re-adjust the bracket position.
Stent in the treatment of cancer 3. Bile duct stricture or pancreatic head, bile duct cancer, metastatic lymph nodes around the bile duct cancer bile duct pressure and other circumstances, lead to bile duct stenosis or obstruction, bile deposition in the liver can not enter the digestive tract, the patient obstructive jaundice appears, and progressive increase, the performance of the whole body skin was dark yellow, dark yellow urine, stool white, liver enlargement. If these patients for surgery, surgical treatment is the preferred method of treatment. If you can not surgery, there is a way to solve the yellow disease called external drainage techniques, namely the expansion of the bile duct into the drainage tube for drainage. However, this approach because in vitro there is a drainage tube, life is very convenient and very easy to plug the drainage tube. If the site of obstruction in the bile duct stent placed in the narrow parts of the expansion of the drainage tube in vitro is not required. First with balloon dilatation and stent placement will be stretched stenosis, bile can enter the intestinal tract, the patient's quality of life improved significantly.
Stent technology in cancer therapy 4. Urinary tract obstruction or non-cancer diseases, for cancer caused by a ureteral stricture or bladder neck, prostate parts of the stricture, the stent can be used to make urinary flow. For ureteral stricture, can be percutaneous, insert the guide wire through the narrow Ministry of the guide wire into the bladder within the first side, and then in a narrow area along the guide wire placed inside the stent. For urethral stricture, urethral orifice can be inserted by catheter, guide wire, first expansion, then place the stent.

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