At present, most domestic medical equipment is powered by 220V mains. Due to the power requirements of various types of medical devices, the most widely used one is the centralized power supply structure. That is, a concentrated power converter produces an output voltage of various voltage levels required. Because of its low cost, high efficiency, adjustable output voltage, low output noise, fast dynamic response, etc., it is very suitable for medical equipment. It is the most widely used power supply method for medical equipment. The medical device power solution needs to consider the following issues. Safety and isolation are a major difference between ordinary commercial power supplies and medical power supplies. Usually, except for some experimental analytical instruments, medical equipment is mostly installed near a hospital bed or operating table, and the distance between the person and the operator is relatively close, and the outer casing is often touched. There are a variety of strong and weak components inside medical equipment. If there is a problem between the isolation of strong and weak electricity or the insulation of the outer casing material, it will be very dangerous. In terms of safety testing, general medical equipment power supplies must be certified to UL60601-1, C-UL, and EN60601-1. The input and output terminals must have an isolation voltage of 4,000V or more, and the ground leakage current is required to be low, which meets the requirements of the safety creepage distance. For the strong electric part, double insulation is required, and in particular, it is possible to strengthen the insulation design with the part that is in contact with the equipment casing. Electromagnetic compatibility and immunity to electromagnetic interference To select or build a good power supply system for medical equipment, care must be taken to improve the electromagnetic compatibility and electromagnetic interference resistance of the power supply. Mainly from the following aspects: design. PCB design and layout, the general power supply will contain some high-frequency signals, any printed circuit on the PCB can play the role of the antenna, the length and width of the printed line will affect its impedance and inductance, thus affecting the frequency In response, a printed line that passes the DC signal in time is also coupled to the RF signal from an adjacent printed line and causes a circuit problem. Therefore, medical power supplies must choose large brands, products with strong research and development capabilities, these products can guarantee good quality in design and production process. shield In order to suppress the radiation generated by the switching power supply and eliminate the influence of electromagnetic interference on other electronic devices in the medical device, the best way is to shield the magnetic field of the power supply and then connect the entire shield to the casing or ground of the medical device. This is a way of doing more with less.
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Analyze the working principle and characteristics of medical inverter power supply
The COVID-19 Antigen Test Cassette is immunoassay based on qualitative membrane strip for the detection of COVID-19 antigen in anterior nasal swab
specimen. In this test procedure, anti-COVID-19-N antibody is immobilized in the test line region of the device. After an anterior nasal swab specimen is placed
in the specimen well, it reacts with anti-COVID-19-N antibody coated particles that have been applied to the specimen pad. This mixture migrates chromatographically along the length of the test strip and interacts with the immobilized anti-COVID-19 antibody. If the specimen contains COVID-19 antigen, a colored line will appear in the test line region, indicating a positive result. If the specimen does not contain COVID-19 antigen, a colored line will not appear in this region, indicating a negative result.To serve as a procedural control, a colored line will always appear in the control line region, indicating that proper volume of specimen has been added and membrane wicking has occurred.