Intraductal Tissue Sampling Device Designed for the Biliary Tract.

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.