Discussion on Medical Gas Engineering Design in Hospitals

2023-10-28 11:00
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At that time, medical operations in China were flourishing, and hospitals across the country used medical centralized gas supply systems in their new construction, renovation, and expansion of medical buildings. The medical gas system is an important component of modern medical systems and a life support system. This article mainly presents some experiences and insights through years of practical experience in medical gas engineering planning, and shares them with industry colleagues.

1、 Introduction to Medical Gas Systems

Medical gas systems include: central oxygen supply system, central suction system, compressed air system, carbon dioxide system, nitrogen system, laughing gas system, and other special gas systems. They are mainly used in operating rooms, ICUs, emergency rooms, general wards, high-pressure oxygen warehouses, etc.

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Gas types and effects of medical gas supply systems: ① Central oxygen supply system: used for patients to inhale oxygen, and used in collaboration with other gases during surgery; ② Central suction system: patients in the ward are intubated, and during surgery, there is a concentration of phlegm and blood. ③ Compressed air system: promoting the use of medical devices as power; ④ Nitrogen system: surgical application; ⑤ Nitrous oxide system: surgical use (anesthesia gas); ⑥ Argon system: surgical application; ⑦ Carbon dioxide system: surgical application; ⑧ Exhaust gas recovery system: Anesthetic gas recovery.

2、 Oxygen supply source and system planning

2.1. Oxygen Supply Source: Medical oxygen supply sources can be set as medical liquid oxygen storage tanks, medical molecular sieve (PSA) oxygen production, medical oxygen cylinder manifolds, or mixed supply methods based on the form of supply and demand. The emergency backup gas source for medical oxygen should not use medical liquid oxygen storage tanks or PSA oxygen production, and should be supplied through the oxygen cylinder manifold method. The medical oxygen supply source consists of a medical oxygen source, a check valve, a filter, a pressure reducing device, and a pressure monitoring and alarm device. The main medical oxygen source should be set up or stored with a gas consumption of 3D (preferably one week) or more, the backup gas source should be set up or stored with a gas consumption of 24 hours or more, and the emergency backup gas source should ensure a gas consumption of at least 4 hours or more in the life support area. Medical oxygen supply sources and medical molecular sieve oxygen production units must be equipped with emergency backup power sources. All exhaust and discharge pipes for medical oxygen should be connected to a safe outdoor location.

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2.2. Oxygen supply source planning advocates that ① in areas where liquid oxygen supply is sufficient, priority should be given to low-temperature liquid oxygen as the main gas source. ② The emergency busbar room, which serves as a life support area, should be placed in the bottom indoor area close to the user's side, and in the outdoor area near the liquid oxygen tank, which can more effectively avoid the risk of damage to the outdoor pipeline network due to accidents such as earthquakes, heavy vehicle rolling, and blind excavation. ③ Except for the requirement that oxygen supply sources should not be installed in the basement according to regulations, oxygen as a combustion gas should be avoided from being installed in underground spaces The demand for liquid oxygen in super large hospitals may break the constraint requirement of four 5m3 storage tanks with a total volume of 20m3. When planning, it is advisable to reserve the location appropriately or set up two liquid oxygen supply sources according to the overall layout.

3、 Negative pressure suction supply source and system planning

3.1. Medical system composition: Medical suction systems generally include components such as vacuum pumps, vacuum tanks, and check valves The medical suction system should be equipped with a backup vacuum pump. When a single vacuum pump with a large flow rate has shortcomings, other vacuum pumps should still be able to measure the flow rate satisfactorily The vacuum unit should be equipped with anti backflow equipment.


3.2. Planning and production of negative pressure suction system

3.2.1. Attracting the computer room should be close to the user center; The suction room should be separated from the air compressor room and must have a physical distance.

3.2.2. The medical suction system of an independent infectious disease medical building should be set up independently; An independent infection building should be equipped with a separate suction system. The relatively small infection outpatient area, due to its low system flow, will an independent system be established in practical engineering? After technical and economic comparison, it will be acknowledged.


4、 Medical compressed air supply source and system planning

The medical air supply source consists of an intake silencer, a compressor, an aftercooler, a filter tank, an air monotone machine, an air filtration system, a pressure reducing device, a check valve, etc., and should comply with the following regulations: ① The medical air supply source should be able to continuously supply air in a single defect situation; ② The supply source should be equipped with a backup compressor. When a single compressor with a large flow rate has shortcomings, other compressors should still be able to satisfactorily plan the flow rate; ③ The supply source should be equipped with anti flow equipment; ④ The gas storage tank of the supply source should be made of corrosion-resistant materials or undergo corrosion-resistant treatment, such as using stainless steel gas storage tanks.