This is the 3740th article of Da Yi Xiao Nursing
For such a behemoth as a car, there are various metal and non-metallic structural parts, circuit boards, chips and other fragile components, fuel, batteries and other high-risk flammable and explosive parts, as well as cylinders, pistons, crankcases, valves and other closed chambers, air conditioning pipes, filters and other components, if dismantled one by one carefully disinfected labor costs and mechanic occupational exposure risk is too great. Moreover, the value of the car is not cheap, and the residue and corrosiveness of some chemical disinfectants will cause safety hazards and affect the service life of the car. Disinfection is divided into the following situations:
1. If your car is parked in the parking lot,
Only touched by a COVID-19 positive
It is recommended to wipe the easily touched outer surface parts such as door handles and trunk handles with a rag and wipes of an ethanol/disinfectant alcohol disinfectant. This type of disinfectant has no residue after volatilization and does not affect the aesthetics of the vehicle. At present, the paint quality of household cars has been very good, most of them are polyurethane and even fluorocarbon metal paints with strong resistance to organic solvents, and ordinary alcohol disinfectants will not damage the paint surface, and can be used with confidence. If the surface is wiped with a chlorine disinfectant, white hydrochloride deposits will be left after drying, and it can be washed with clean water after the disinfection operation is completed.
2. If your car has carried a positive patient,
But the air conditioning in the car was not turned on throughout the whole process.
Open windows throughout the process for natural ventilation
Wipe the door handles and trunk handles with ethanol/disinfectant alcohol disinfectant rags and wipes, paying particular attention to the easily touched parts of the car, such as seats, floors, roof handles, seat belts, and windows, to reduce the risk of contact transmission.
3. If your car is carrying a positive patient and turns on the air conditioning in the car
This is more troublesome, the use of liquid chemical disinfectants can only disinfect the outer surface of the car, can not penetrate into the complex ventilation ducts inside the car. Therefore, it is recommended that gas disinfection can be carried out with reference to the commonly used bed disinfection methods in medical institutions. Disinfection time is recommended to be carried out outdoors in the evening, with scotch tape, medical ozone disinfection machine and long tow board power supply ready. After completing the disinfection of the outer surface, open the door, start the engine idling operation, set the air conditioning temperature in the car at room temperature, set the circulating air volume to circulate inside, close other windows, leave only one window leak, insert the hose of the ozone generator into the gap and then seal the fixed hose with scotch tape, and then open the ozone disinfection machine, the ozone is continuously poured into the interior of the car, and the circulation fan in the car will distribute the ozone disinfectant to the inside of the ventilation ducts in the car. If possible, it is recommended to replace the air filter of the air conditioner before disinfection.
The operation time of conventional ozone disinfection is about 30 minutes, which can be adjusted according to the space size of the vehicle. During the operation, the owner needs to pay attention to the engine conditions, and some vehicles may have problems such as poor heat dissipation or high water temperature if the engine idles for too long. The reason why it is recommended to be carried out in the evening is to prevent the greenhouse effect during the day, so as to avoid spontaneous combustion of the vehicle overheating; do not idle in a closed garage with poor ventilation for too long to avoid the risk of carbon monoxide poisoning. Although in theory, the hydrogen oxide disinfection machine can also be used for gas disinfection, but this disinfection machine uses 30-35% hydrogen peroxide, which is a dangerous, explosive control chemical, and its disinfection cost is too high and is not suitable for the general public. Ozone disinfection only requires electricity, no other consumables, and has better economy and safety.
In the high-touch doorknob epidemic prevention and disinfection, there is another technology worth referencing. Scientists in Australia and other countries have found that the new crown virus has the shortest survival time on copper door handles, so foreign countries have removed beautiful stainless steel door handles and changed them to traditional copper handles. The author believes that the cost of this operation is too high, the replacement of the door handle needs to be re-opened, and the mainland copper resources are small, need to import a large number, and the replacement of copper door handles is not suitable for China's national conditions. The authors tried a lower-cost alternative: it was cut with copper foil with conductive adhesive backing and pasted on the office doorknob, and after 2 years of use, the copper foil on the office doorknob was still intact, but the copper foil would be oxidized brown by the air, but it was not worn. This copper foil with conductive adhesive backing was originally used for high-frequency electromagnetic interference (EMI) shielding grounding in the gap of the chassis and hinges at a low cost. If you do not have high aesthetic requirements, you can try to wrap the door handle with this cheap copper foil tape, and the thickness of the copper foil tape is about 0.06-0.03 mm.
Author: Li Ping, Chief Pharmacist, Department of Clinical Pharmacy, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, member of Shanghai Medical Association, Shanghai Microbiology Society Microbial Resistance Prevention and Control Committee, and China Radio Sports Association.