The role of medical gas compressed air

Technical note on the central role of medical compressed air

as the key infrastructure of modern medical system, medical compressed air is used in many core fields, such as life support, precision treatment, equipment drive and so on. The technical value and quality requirements are hereby specified as follows:

1. life support system core power

1. respiratory therapy guarantee: Provide clean power source for ventilator and anesthesia machine, and maintain respiratory function of critically ill patients through accurate matching of oxygen and compressed air. In scenarios such as neonatal monitoring, it is necessary to ensure that the gas pressure fluctuation range does not exceed ± 5% to avoid impact on the delicate respiratory system.
2. First aid scene application in emergency treatment such as cardiopulmonary resuscitation, compressed air-driven respiratory support equipment needs to reach the rated working pressure within 30 seconds to strive for a critical time window for rescue.

2. precision medical equipment power cornerstone

1. operating room equipment drive:
   • orthopedic pneumatic drills require compressed air pressure to be stable at 0.4-0.6MPa to ensure bone cutting accuracy of 0.1mm
   • minimally invasive surgical pneumatic arm should be equipped with a three-stage filtration system to avoid particle contamination of the surgical field of view.
2. Dental treatment support:
   • dental high-speed handpiece speed up to 400000 rpm, driven by dry oil-free compressed air
   • when cleaning the tooth surface with an air gun, the gas dew point is required to be ≤-20 ℃ to prevent condensed water from affecting the bonding effect.
3. disinfection supply guarantee:
   • the door seal drive of the pulsating vacuum sterilizer needs 0.6MPa clean air pressure to ensure the sealing reliability of the sterilization chamber.
   • The water content of compressed air shall be less than or equal to 1.23 g/m & sup3 in the drying process after cleaning the equipment, so as to avoid corrosion of the equipment.

3. special treatment scenario application

1. hyperbaric oxygen therapy: Provide pressure balance gas source for the oxygen chamber to ensure that the oxygen concentration in the chamber is stable in the safe range of 23%-25%
2. physical Therapy Support: Drive the extracorporeal shock wave therapeutic apparatus, require the gas pulse pressure to reach 80MPa, and control the oil content <0.01 mg/m & sup3;
3. rehabilitation Equipment Power: Provide pulse airflow for pneumatic massage instrument and anti-bedsore air cushion bed, and the pressure adjustment accuracy should reach 0.02MPa

4. quality assurance technology system

1. multistage purification standard:
   • pre-filtration accuracy 5μm, intercepting large particles of impurities
   • precision filtration 0.01 μm to remove microorganisms and particles
   • activated carbon adsorption layer to eliminate odor and gaseous pollutants
2. requirements for drying treatment:
   • freeze dryer makes the pressure dew point reach 2-10 ℃
   • adsorption dryer can realize deep drying below -40 ℃
3. real-time monitoring system:
   • continuous detection of oil content, total number of microorganisms, CO/CO₂ concentration and other 12 indicators
   • set the level 3 alarm threshold, and start the standby air source switching within 30 seconds after the limit is exceeded.

5. System Design Specification

1. redundancy Configuration Principles:
   • large hospitals adopt "2 for 1 standby" compressor unit configuration
   • the volume of the gas storage tank is designed for redundancy at 30% of the maximum gas consumption.
2. Pipe material standard:
   • the main pipe uses 316L stainless steel seamless pipe
   • the terminal branch pipe adopts medical grade copper pipe, and the inner wall roughness is ≤ 0.4μm.
3. Maintenance Management Requirements:
   • drain the condensate from the gas tank daily and check the pH value
   • quarterly microbial sampling culture
   • entrust a third-party testing agency to issue a full quality report every year.

The reliability of medical compressed air system is directly related to the safety of medical process. It is recommended that medical institutions establish a compressed air quality management system, from the selection of air source equipment, pipeline construction acceptance to daily operation and maintenance, to implement the whole process quality control, with special attention to the gas quality assurance of high-risk scenarios such as respiratory therapy and aseptic operation. For the continuous operation system, an intelligent monitoring platform should be configured to realize real-time monitoring and abnormal early warning of key parameters such as pressure, flow and purity.