Effect of compressed air in the colonoscopy room

Official instructions on the role of compressed air in the colonoscopy room

As the core auxiliary system for colonoscopy diagnosis and treatment, compressed air plays an irreplaceable role in intestinal examination, equipment driving, infection control and other aspects. After comprehensive technical analysis and industry practice verification, its core functions and technical requirements are described as follows:

1. Intestinal examination auxiliary function

1. The intestinal tract is inflated and dilated
   • Inject compressed air into the intestine through the colonoscopic air injection channel to expand the intestinal lumen to an observable state, ensuring that the camera clearly captures mucosal lesions.
   • Pressure control: Maintain a pressure range of 58-125 psi (0.4-0.85MPa) and a flow rate of ≥1.1 scfm to avoid the risk of intestinal perforation caused by excessive air pressure.
2. Inspection process control
   • The doctor uses the foot switch to adjust the inflation volume in real time to adapt to different intestinal segment curvatures (for example, the sigmoid colon and splenic flexure require a 20-30% increase in volume).
   • Equipped with a pressure relief valve, it automatically exhausts when the intestinal cavity pressure exceeds the limit (usually set to 150 psi), creating a dual protection mechanism.

2. Power support for diagnosis and treatment equipment

1. Endoscope system drive
   • Provides power for pneumatic control elements to achieve precise steering of the curved part of the colonoscope from 0 to 180°, with steering response time ≤0.3 seconds.
   • Drive the water supply pump to ensure a continuous flushing flow rate of 30ml/min to ensure clarity of vision.
2. Air supply to cleaning and disinfection device
   • The fully automatic cleaning and disinfection machine relies on compressed air for lumen purging (wind speed ≥25m/s) and device drying (dew point ≤-40℃).
   • Equipped with a two-stage filtration system: 0.2μm primary filtration +0.01 μ m precision filtration to ensure that air cleanliness meets ISO 8573-1:2010 Level 1 standard.

3. Infection control guarantee system

1. Gas source purification treatment
   • It adopts an oil-free air compressor, equipped with a freezing dryer (-50℃ dew point) and an activated carbon adsorption device to remove 99.97% of water and oil vapor.
   • A antibacterial coating is sprayed on the inner wall of the gas storage tank to inhibit bacterial reproduction, and the total number of colonies in the condensate water at the bottom of the tank is regularly tested (≤10CFU/mL).
2. Terminal filter protection
   • A 0.01μm sterilization filter is equipped with the air point, and the filtration efficiency of particles with a diameter of ≥0.3μm reaches 99.9999%.
   • The filter pressure differential alarm device automatically prompts for replacement when the resistance exceeds 0.05MPa to avoid the risk of filter element penetration.

4. Environmental maintenance function

1. Construction of positive pressure environment
   • Maintain a positive pressure difference of 5-10Pa in the colonoscopy room to prevent external contaminated air from invading through door gaps and transfer windows.
   • Equipped with differential pressure sensors, real-time monitoring and linkage with the air conditioning system to adjust the fresh air volume.
2. temperature and humidity control
   • The compressed air system integrates an aftercooler to ensure that the supply air temperature is 5-40 ° C to avoid the generation of condensed water.
   • Drive the dehumidifier to maintain indoor humidity at 25-75%RH to prevent dew condensation failures in electronic equipment.

V. Quality monitoring system

1. on-line monitoring system
   • Display 12 parameters such as pressure, flow, and dew point in real time, and the data update cycle is ≤1 second.
   • Set three-level alarm thresholds (early warning value/alarm value/shutdown value) to achieve early warning of faults.
2. Regular testing requirements
   • Oil content: Infrared spectrophotometry is used to detect every month, and the limit is ≤0.1mg/m³.
   • Microorganisms: The compressed air is tested for active microorganisms every quarter, and the total number of colonies is ≤1CFU/m³.
   • Particulate matter: Entrust a third-party testing agency every year to verify the purification efficiency according to ISO 8573 standard.

As the “invisible guardian” of colonoscopy diagnosis and treatment, the stability of the compressed air system is directly related to inspection safety and diagnostic accuracy. Medical institutions should establish a full life cycle management system that combines intelligent monitoring platforms and preventive maintenance strategies to ensure that the system continues to provide clean and stable compressed air power. For high-risk areas such as the colonoscopy room, it is recommended to configure backup air sources and automatic switching devices to achieve zero interruption of air supply and provide a solid guarantee for accurate diagnosis and treatment of digestive tract diseases.