In the assembly and repair of medical flexible endoscopes, O-rings are critical sealing components. Their functions and commonly used materials are as follows:

Functions:

• Sealing and leak prevention: Provide reliable sealing at air, water, vacuum, and electrical interfaces to prevent the ingress of liquids or gases into the endoscope.
• Prevention of cross-contamination: Act as a barrier to bodily fluids and cleaning/disinfection solutions, reducing the risk of internal biological contamination.
• System stability: Ensure long-term stable operation of the air/water system, biopsy channel, and connection interfaces under working pressure.

Materials:

• Medical-grade silicone: Excellent elasticity and flexibility, wide temperature resistance, and good biocompatibility; suitable for repeated cleaning and disinfection cycles.
• Fluorocarbon rubber (FKM / Viton): Outstanding chemical resistance and aging resistance; suitable for components exposed to disinfectants and chemical cleaning agents.

During repair, O-rings should be selected strictly according to the original specifications, dimensional tolerances, and chemical resistance requirements to ensure sealing performance and patient safety.

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