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An endoscopic Doppler probe: preliminary clinical evaluation.

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Ultrasound in Medicine & Biology

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A novel miniature Doppler catheter enables visualization of submucosal blood vessels during gastrointestinal endoscopy. This technology offers new diagnostic insights previously unavailable with standard endoscopic techniques.

Area of Science:

Gastroenterology
Medical Devices
Vascular Imaging

Background:

Modern gastrointestinal endoscopy allows visualization of the esophageal, stomach, duodenal, and colonic walls.
Current diagnostic methods rely on mucosal inspection, biopsy, and cytology.
Assessing submucosal blood vessel characteristics is not feasible with existing endoscopic tools.

Purpose of the Study:

To develop and evaluate a miniature pulsed Doppler catheter for use during gastrointestinal fiberendoscopy.
To assess the feasibility of visualizing submucosal blood vessels beneath the gastrointestinal mucosa.
To investigate the device's safety and efficacy in clinical applications.

Main Methods:

A miniature 8 MHz pulsed Doppler system with range limiting was developed.

Related Experiment Videos

The 1.8 mm diameter probe, 2 m in length, passes through the biopsy channel of standard fiberendoscopes.

The device was tested in animal studies and clinically in patients for specific indications.

Main Results:

The Doppler catheter was tested in 90 patients for retroduodenal artery detection before endoscopic papillotomy.
It was also used in 33 patients to detect flow in esophageal varices before and after sclerotherapy.
Preliminary results indicate the device provides valuable information on submucosal blood vessels.

Conclusions:

The developed pulsed Doppler catheter is a safe and effective tool for gastrointestinal endoscopy.
It offers novel capabilities for assessing submucosal vasculature, complementing current diagnostic methods.
This technology has the potential to improve diagnostic accuracy and treatment planning in gastrointestinal procedures.