EYELETS IN THE BENDING SECTION OF AN ENDOSCOPE
“A” in school was good. Why does an “A” in endoscope models mean frequent repairs?
When it comes to the bending section of an Endoscope Hospital Purchasing agents would like to be able to buy endoscopes that are comfortable for all doctors to use. Some like a stiff insertion tube which can be pushed and self-guides through the lumens. Some docs like a flexible insertion tube which they can inch forward, angulate the tip and grab a fold of colon to pull themselves forward. Each to his own choosing The “A” model designation, such as; PCF-H180AL and CF-Q180AL, means the Insertion Tube has an additional wire inside which can modify the stiffness of the Insertion Tube based on the Doctor’s preference. The problem occurs when the adjustment is always left in the stiff setting, during each use and storage.
Eyelet Repair of the Bending Section
The bending section has a chain drive under the control knobs that pull angulation wires which run through separate channels. When one wire is pulled taut – it collapses the bending section in the designated direction. In prior generations before the “A” models, the opposite side angulation wire would slacken and even bunch up or zig-zag in the channels provided. But with the “A” models adjusted to stiff the slacken side is also tight. So when the wire travels back and forth through the eyelets, it cuts into the eyelet in both directions. similar to a hack saw blade with teeth in both directions. Ten years ago the average bending section needed 6 eyelets replaced due to worn interior or cutting. Today, the “A” models typically need 24 eyelets replaced and some are cut through entirely leaving so called bulls horns to do additional damage to the internal elements. This tightened wire is enhanced when an angulation adjustment is done in adjustable stiff mode.
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