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Causes and Solutions for Nozzle Blockage of Gastrointestinal Endoscopes

Function of the Nozzle

Irrigation and Cleaning: When food residues, blood, or secretions obscure the lens, the jetted water column can quickly clear the field of view and ensure image sharpness.
Gastrointestinal Insufflation: By infusing gas into the gastrointestinal tract, the originally collapsed lumen is inflated and expanded, allowing physicians to clearly observe the internal structures.

Once the nozzle is clogged, endoscopists will be like "seeing flowers through fog" — this not only prolongs the examination time, but also may lead to missed tiny lesions and even increase surgical risks.

Common Causes of Nozzle Blockage

Biofilm Accumulation: After gastrointestinal endoscopes are used, if they are not thoroughly cleaned, organic substances such as proteins and mucus will form biofilms inside the nozzles, which gradually accumulate and eventually cause complete blockage.
Scale Deposition: In some regions, underground mineral water is used. This water is rich in various elements such as sodium chloride, potassium, bromine, calcium, and magnesium. When the water is boiled or settled, a layer of fine floating matter appears on the surface. Although the impurities and minerals in the water meet the drinking water standards for human consumption, the nozzle of electronic gastroscopes for air and water delivery has a small diameter and a bent angle. During suction, these tiny impurities are easily drawn into the nozzle due to negative pressure. Over time, the impurities will get stuck at the bent angle and cause blockage.
Disinfectant Crystallization: Improper disinfectant concentration or insufficient rinsing can lead to crystallization inside the endoscopic channels.
Structural Damage: Minor damage to the nozzle edge may alter the water flow direction, reduce cleaning efficiency, and indirectly result in blockage.
Neglected Water Bottle Cleaning:In humid conditions, microorganisms and fungi tend to breed inside water bottles. Over time, they form impurities that clog the nozzle.

Blockage Prevention: Key Points of Daily Maintenance

Correct Cleaning Procedures

Perform bedside pre-treatment immediately after each use.
Thoroughly clean all channels with special cleaning brushes in accordance with the manufacturer’s guidelines.
Ensure the disinfectant concentration and soaking time comply with specifications.

Water Quality Management

Use filtered or softened water for final rinsing.
Conduct regular inspections of the water treatment system.

Regular Professional Maintenance

Establish a preventive maintenance program for endoscopes.
Arrange regular in-depth cleaning and inspection by professional technicians.

Correct Handling Procedures When Blockage Occurs

Immediately stop the examination to avoid pressure damage caused by forced irrigation.
Attempt gentle unclogging: Use the manufacturer-recommended special stylet (never use regular needles!
Professional treatment: If the problem cannot be resolved, send the endoscope to the technical personnel of the endoscopy center or the manufacturer for repair.
Complete documentation: Record the blockage details, handling methods, and outcomes for root cause analysis and process improvement.

A tiny nozzle safeguards not only a clear field of view, but also patients’ health. In the sophisticated world of medical care, every detail deserves meticulous attention.

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