Technical indicators of maternal and infant monitor

The parameters measured by maternal and infant monitor include fetal heart rate, uterine contraction pressure, fetal movement, maternal blood pressure, blood oxygen, pulse, electrocardiogram, respiration and body temperature. Then it is converted into an electrical signal with a definite functional relationship with it, which is recorded and displayed after being amplified, filtered, calculated and processed. Therefore, the sensor is a key component. Sensitive elements and conversion elements in sensors are components that directly sense or respond to measurements and convert them into electrical signals. Such as a thermistor for sensing body temperature, a sensing diaphragm for invasive blood pressure detection, and the like. , are sensitive elements. Conversion elements such as photoelectric cell in blood oxygen saturation, bridge in respiratory measurement, etc. The signal conditioning and conversion circuit processes and amplifies the electric signal output by the sensor element and converts it into a signal which is convenient to be processed by the microprocessor circuit or the display and recording circuit.

In 2006, the national quality supervision and inspection items of medical devices were: ultrasonic working frequency, fetal heart rate measurement and display range, fetal heart rate measurement error, alarm function, uterine contraction pressure measurement range, normal continuous working time, external marking, random file integrity, input power, enclosure sealing, protective grounding impedance, continuous leakage current at normal working temperature, dielectric strength at normal working temperature, continuous leakage current after wet pretreatment, and continuous leakage current after wet pretreatment. The main problems of unqualified products are ultrasonic working frequency, measurement and display range of fetal heart rate, measurement error of fetal heart rate, alarm function, measurement range of uterine contraction pressure, external labeling, integrity of random files, continuous leakage current at normal working temperature, dielectric strength at normal working temperature, continuous leakage current after wet pretreatment, requirements of network power supply fuse and overcurrent releaser, etc. Not up to standard.