Talking about medical compressed air system and its application JIANG Dan,SHAN Ming (The Fifth People's Hospital of Suzhou, Jiangsu Province, Suzhou, Jiangsu 215007, China)[]TH789[]B[] With the clinical application of ventilators and anesthesia machines is more and more extensive, Medical compressed air systems must also receive attention. This paper gives a brief introduction to the structure, main components, applications and management of the system.
[] medical compressed air system; air compressor; refrigerated dryer; management; maintenance medical gas system is also known as life support system, including medical positive pressure compressed air, oxygen, carbon dioxide, laughing gas, vacuum vacuum suction system Anesthesia exhaust system, etc., is an important infrastructure for providing medical services to patients. The medical compressed air system is mainly used to provide positive pressure air for ventilators, anesthesia machines, etc. to support patient breathing or surgical anesthesia, as well as infant care, driving of surgical tools, testing of medical equipment, drying of medical equipment, power of dental equipment, and Gas source system piping purge, etc. The system consists of an air compressor, a gas tank, a compressed air precision filter, a dryer, a pressure reducing valve, a control protection device, a pipe and a terminal.
1 Main components of medical compressed air system 1.1 Air compressor 1.1.1 Concept Air compressor is the most important equipment in compressed air system. It converts the mechanical energy of prime mover (usually electric motor) into gas pressure energy, which is compressed air. Air pressure generating device.
The air compressor is divided into oil lubrication, oil-free lubrication and no oil lubrication according to the lubrication method. In the oil-lubricated air compressor, the gas is directly in contact with the lubricating oil during the compression process, so that the exhaust gas contains a large amount of oil. Although the oil-water separator and the gas tank can separate most of the oil, a small amount of oil remains in the gas, so that Carbon Hydration in Air 3 The medical pulsating vacuum steam sterilizer steam-water separator has a scientific and reasonable structure, simple manufacturing, low cost, good steam-water separation effect, and reduces the workload of repeated disinfection caused by wet pack in the hospital disinfection supply center. It saves manpower and financial resources for the hospital, and thus also plays a role in extending the life of the medical pulse vacuum sterilizer. A steam-water separator can work with multiple medical pulsed vacuum steam sterilization cabinets at the same time, and has strong practicability. We have not inquired about the production of this device at home and abroad through the "Science and Technology Review". This technology has a leading level in the domestic and military, can apply for patents, mass production, and will create considerable economic and social benefits.
1 Li Shuangmin. Development of a steam-water separator for medical pulse vacuum sterilizer 2ç—¤ Guocheng, Wang Mansheng, Separation mechanism analysis of wire mesh gas-liquid separator J. Food and Machinery, 2011, 3 Li Shuangmin. Development of steam-water separator for medical steam sterilizer J. Medical and health equipment, 2012, 9:27 indicators exceeded. In addition, the lubricating oil in the cylinder is highly prone to carbon deposit and accumulates in the exhaust pipe and the gas storage tank at high temperatures. The oil friction surface of the oil-free lubricating air compressor is not oil-lubricated, that is, the gas is not in contact with the oil, and oil pollution and carbon deposition are avoided.
Air enters the cylinder through the intake muffler filter and intake valve.
During the compression stroke, air is compressed from its original volume into a smaller volume or a higher pressure, which is then pushed out of the cylinder through the exhaust valve and into the intercooler tube, where the heat generated by the first stage of compression passes The intercooler is cooled. During the suction of the second stage piston, the cooled air enters the second stage cylinder through the intake valve. The compression stroke of the second stage piston compresses the air into a final discharge pressure and enters the air reservoir or external air system through the exhaust valve.
The function of the air compressor is to draw in a certain volume and pressure of air and compress it into smaller, higher pressure air for output.
1.2 Refrigeration dryer (hereinafter referred to as the dryer) The dryer is a compressed air purification device, which forcibly cools the compressed air, so that a large amount of water vapor and oil mist contained therein are condensed into droplets discharged from the machine by the drainer. In order to obtain dry and pure compressed air, the pressure dew point reaches the specified temperature and is output.
1.2.2 Working principle The heat exchange between the refrigerant and the compressed air is used to reduce the temperature of the compressed air to a dew point of 2~10*C, so that the water content in the compressed air tends to be supersaturated, thereby removing the moisture in the compressed air. .
The dry and pure compressed air obtained by the dryer can inhibit the survival and reproduction of bacteria, prevent condensation at low temperature into liquid water, prevent oxidation of the system piping, and prevent damage to ventilators and anesthesia machines (especially oxygen batteries and test boards). .
2 The process of the medical compressed air system The air compressor boosts the ambient air to the storage tank, and removes impurities such as moisture, dust and oil in the compressed air through the freeze dryer and the filter to obtain medical compression. air. The medical compressed air is then passed through a pressure reducer, and the constant pressure gas is continuously piped to the ward, the emergency room, the operating room, etc., and the gas terminal is connected with medical equipment such as a ventilator and an anesthesia machine to ensure normal operation.
3 Management and maintenance of medical compressed air system The ventilator and anesthesia machine using medical compressed air system are necessary equipment for anesthesia, first aid resuscitation and rescue of critically ill patients. Whether it is normal operation is directly related to the patient's treatment effect and even life safety. . Therefore, it requires strict management and regular maintenance to ensure the reliability of equipment operation. The mechanical transmission structure of the compressed air supply device is prone to wear in long-term use and has high requirements on the use environment. Failure to pay attention to regular maintenance or improper handling during maintenance can result in a higher failure rate of the compressed air supply.
With the development of hospitals and equipment renewal, most of the hospitals now use oil-free air compressors. Here we use oil-free air compressors as an example to summarize some of the experiences in their daily maintenance: (1) The press filter is regularly inspected to ensure that the intake air is unobstructed and the air compressor is in a normal inhalation state. (2) The shutdown and start of the all-oilless air compressor are within 6 to 10 times per hour to ensure that the lubricating oil in the sealed chamber does not melt due to the continuous high temperature. (3) According to the use situation and the instructions provided by the manufacturer, add the corresponding grease regularly.
In summary, the medical compressed air system plays an irreplaceable role in the hospital, and its use has medical speciality. Therefore, the medical compressed air system should be jointly managed by the medical department, engineering technical department and equipment and equipment department. Each of them is responsible for participating in the construction, reconstruction, archive management and verification of gas quality of the compressed air system.
1st floor Xiaomin, Liu Xian, Lu Yibin. The relationship between medical compressed air system and medical device application safety J. Zhengwen contest album, 2010, 25 2 Yin Xiting. The role of air compressor (piston type) in the medical air pressure chamber system, the choice of lubrication method and daily maintenance J.Medi- 3 Yang Bin, Zhang Mei, Yuan Zhongqing. Compressed air supply system based on pressure monitoring medical center J. Medical and health equipment, 2010, 31 (1): 4 Zhu Xi. Ventilator air compressor fault repair J. China Medical Equipment 5 Lai Lifen, Cao Yang, Liu Fang, Shu Liu 1, Feng Huasong, Zhao Huijun. The influence of medical compressed air system on the use of ventilator and countermeasures J. Hai
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