Olympus UM-S20-17S Medical Endoscopic Ultrasound Probe

The Olympus UM-S20-17S is a medical endoscopic ultrasound (EUS/EBUS) miniature probe made by Olympus.

It is an ultra-thin radial ultrasound probe used during bronchoscopy and other endoscopic procedures to image inside very narrow body passages.

Key idea

Think of it as a tiny 360° ultrasound scanner on a flexible wire, used through an endoscope to see what’s inside the body without surgery.

Main features
Type: Radial mechanical ultrasound miniature probe
Diameter (tip): ~1.4 mm (very thin)
Frequency: 20 MHz (high-resolution imaging)
Imaging: 360° cross-sectional view of surrounding tissue
Working length: ~2150 mm (long enough to reach deep lung areas)
Guide sheath compatible: Yes (for accurate targeting in small airways)
What doctors use it for

It’s mainly used in:

Bronchoscopy (lungs)
Peripheral lung lesion evaluation
Small airway imaging
Sometimes bile duct / pancreatic duct imaging

It helps locate and assess:

Small lung nodules
Tumors in peripheral airways
Narrow duct abnormalities

Simple summary

The UM-S20-17S is a high-resolution, ultra-thin ultrasound probe for deep lung and narrow duct imaging, used in advanced diagnostic endoscopy—not a general medical scanner, but a specialized tool for pulmonology and gastroenterology.

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