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Updated: Nov 16, 2025

Endoscopic Ultrasound-Guided Biliary Drainage: Endoscopic Ultrasound-Guided Hepaticogastrostomy in Malignant Biliary Obstruction
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Intraductal Tissue Sampling Device Designed for the Biliary Tract.

Malay S Patel1, Matthew D Carson2, Eric J Seibel2

  • 1Department of Mechanical EngineeringUniversity of WashingtonSeattleWA98195USA.

IEEE Journal of Translational Engineering in Health and Medicine
|February 26, 2021
PubMed
Summary
This summary is machine-generated.

A novel, expandable biopsy device offers improved tissue sampling for diagnosing diseases in narrow biliary strictures. This minimally invasive tool enhances diagnostic accuracy, reducing false negatives in procedures like ERCP.

Keywords:
Biliary biopsyNiTiendoscopic biopsy devicefinite element analysishelical bucklingsuperelastic alloy

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Area of Science:

  • Biomedical Engineering
  • Gastroenterology
  • Medical Device Design

Background:

  • Current tissue biopsy methods for biliary strictures have low sensitivity, leading to potential false negatives.
  • Minimally invasive techniques for small duct biopsies are limited in diagnostic yield.

Purpose of the Study:

  • To develop and evaluate a novel, expandable biopsy device for accurate tissue sampling in biliary strictures.
  • To improve diagnostic accuracy and tissue yield during endoscopic retrograde cholangiopancreatography (ERCP) procedures.

Main Methods:

  • A novel biopsy device with deployable blades was designed and modeled using finite element analysis.
  • Parametric studies assessed device performance, including deployment forces, radial expansion, and cutting stiffness.
  • A prototype device was fabricated from a NiTi superalloy and experimentally validated.

Main Results:

  • Optimal device parameters identified: 10 mm length, 3.5 mm diameter, [Formula: see text] blade thickness.
  • Safe deployment achieved with 10N force, enabling over 3x radial expansion.
  • Experimental validation showed strong agreement with numerical models, with peak force within 2% and full recovery after compression.

Conclusions:

  • The pre-clinical research demonstrates a novel expandable device for effective tissue biopsy in narrow biliary strictures.
  • The device has the potential to significantly improve diagnostic tissue yield compared to existing methods during ERCP.