What Is a Flexible Endoscope? Anatomy, Types and Typical Uses

The basic idea

Where a rigid telescope is a straight tube, a flexible endoscope can follow the shape of the anatomy. The operator guides it with a control handle, steering the tip while advancing the insertion tube. The instrument provides light, an image, and one or more channels for air, water, suction or instruments.

Flexible endoscopes are made for diagnosis and many therapeutic tasks. For a comparison with rigid optics, read rigid vs flexible endoscopes.

The same scope is seen differently by each profession. The clinician cares about image, steering and channel size; the biomedical engineer cares about leaks, wear and test results; the reprocessing nurse cares about how many channels must be brushed and rinsed. A good specification meets all three views.

Anatomy: parts and their function

Most flexible endoscopes share the same main parts. Knowing them helps with inspection and troubleshooting:

• Control handle with angulation wheels or levers, valves for air, water and suction, and a working-channel port
• Insertion tube, a flexible shaft that carries channels, light guide and image path
• Bending section near the tip, steered by wires, which gives the scope its manoeuvrability
• Distal end with objective lens or sensor, light outlet and channel openings
• Universal cord or connector that links the scope to the processor and light source
• Working (instrument) channel, which doubles as the suction channel in many designs

Image path: video chip or fibre bundle

Older and some slim scopes use a coherent fibre bundle to carry the image to an eyepiece or camera. These are called fibrescopes. Video endoscopes place a small image sensor at the tip and send an electrical signal to a processor, giving digital quality, easy recording and no eyepiece.

Sensor-based flexible endoscopes are now common in many specialties. Richard Wolf's flexible sensor endoscopes BOA, COBRA and MAMBA are examples for endourology: BOA and COBRA are ureterorenoscopes and MAMBA is a cystoscope, designed for the ENDOCAM Logic 4K platform.

A video endoscope also needs a compatible processor to display the image, so scopes and processors must be bought as a matched system or checked for compatibility. This is a frequent source of surprises when a department replaces only one of them.

Main types by specialty

Flexible endoscopes are named for the organ they examine. Gastroscopes and colonoscopes serve gastroenterology; bronchoscopes serve pulmonology; nasopharyngoscopes and laryngoscopes serve ENT; ureteroscopes and cystoscopes serve urology; hysteroscopes and choledochoscopes appear in gynaecology and biliary work.

Sizes range from very slim ENT scopes to larger therapeutic gastrointestinal models, with the working-channel diameter determining which instruments can pass. Single-use versions exist for some types; reusable scopes need reprocessing as described in flexible endoscope reprocessing steps.

Choosing and caring for flexible scopes

When specifying a scope, compare outer diameter, channel size, bending angles, field of view, image sensor or fibre quality, and compatibility with your processors and light sources. Also ask about repair access in the UAE, loaners and costs, discussed in flexible endoscope price.

Handle scopes carefully: avoid sharp bends, protect the distal tip, never force the angulation wheels, and perform a leak test before each cleaning. Beckfinity supplies Richard Wolf endoscopic systems; see the Richard Wolf range or contact us for advice on your department.

Keep a log for each scope with serial number, repairs and leak-test results. Trends in the log reveal a scope that is approaching the end of its life before it fails in a clinic.