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[Shape-memory nitinol alloy endoprosthesis for malignant biliary strictures]

W Q Gu1

  • 1General Hospital of People's Liberation Army, Beijing.

Zhonghua Wai Ke Za Zhi [Chinese Journal of Surgery]
|May 1, 1993
PubMed
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A novel nitinol alloy endoprosthesis effectively treated malignant biliary strictures, preventing bile sludge obstruction. This shape-memory alloy stent offers a durable solution for long-term biliary patency.

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Gastroenterology

Background:

  • Biliary strictures pose significant clinical challenges.
  • Current endoprostheses are prone to clogging with biliary sludge.
  • Nitinol alloy offers unique shape-memory properties for medical devices.

Purpose of the Study:

  • To evaluate the efficacy of a novel nitinol alloy endoprosthesis for malignant biliary strictures.
  • To assess the patency and safety of nitinol stents compared to conventional options.
  • To investigate the prevention of biliary sludge obstruction with the new endoprosthesis.

Main Methods:

  • Development of a shape-memory nitinol wire coil stent.
  • Endoscopic or surgical insertion of the slenderized stent into strictured bile ducts.

Related Experiment Videos

  • In-situ expansion of the stent using heated saline (39°C) for shape recovery.
  • Clinical application in 13 patients with malignant biliary strictures.

    • Main Results:

    • Successful deployment and expansion of nitinol endoprostheses in all patients.
    • No instances of biliary sludge formation or obstruction observed during follow-up (1-16 months).
    • Maintained long-term patency of the biliary strictures.

    Conclusions:

    • Shape-memory nitinol alloy endoprostheses are effective for treating malignant biliary strictures.
    • Nitinol stents demonstrate superior resistance to biliary sludge obstruction.
    • This novel endoprosthesis offers a promising solution for maintaining biliary drainage and preventing complications.