Precautions for use of portable sphygmomanometer:
1. The armband should be as high as the heart, the upper arm should naturally droop, the elbow and forearm should be naturally placed on the table, and the palm should be facing upwards. Do not place your entire arm flat on the table above your heart, or place your arm too high on a cushion:
2. We need to measure blood pressure in the same posture every day during fixed working hours and in the same state in the enterprise:
3. It should be possible to conduct analysis and measurement in the "497" state. Before measurement, "497" should rest for 10-20 minutes and take 2-3 deep breaths. After 4 meals or exercise, it is necessary to rest for at least one hour before conducting data measurement;
4. Do not measure blood pressure after taking a shower. Smoking, drinking alcohol, or drinking coffee: 6. When you don't want to urinate, take your blood pressure.
5. Keep a good mood when measuring, not good. Feeling tired and not nervous.
The working principle of blood pressure measurement:
There are two types of blood pressure control: one is systolic blood pressure, which is the blood pressure measured by injecting 50 liters of fat blood into the blood vessels. The other is diastolic blood pressure, which is the pressure obtained by the heart during non systolic activity. When the pumping pressure is greater than or equal to one blood pressure, the blood system begins to develop and flow, producing some so-called cuff sounds. At this time, for systolic blood pressure, it is necessary to start micro recording from here. After listing, when there is no cuff sound, This point is the diastolic blood pressure. The blood pressure is determined based on the N-silver envelope bundle of the pressure la wave during the decompression process. A few days ago, everyone agreed that when the FOX amplitude of the pressure oscillation wave in the cuff is large, the cuff pressure is the average pressure and motion of the artery.
The systolic blood pressure of the pulse corresponds to the first important inflection point of the envelope of different amplitude intensities, and the diastolic blood pressure corresponds to the second inflection point of the development of the envelope s
Determination of systolic blood pressure and judgment; Usually, we can use the domestic large amplitude s method, that is, develop the rising segment of the pulse wave amplitude envelope during the deflation process. When the ratio of pulse wave amplitude U to Uimlis s Ka in a certain era, Zang believes that
The corresponding air jacket pressure is the contraction pressure.
Determination and judgment of diastolic pressure: larger amplitude method can also be used to measure, but when the ratio of pulse wave amplitude UI to LM s KD is at a certain time, the corresponding air casing pressure is generally considered as diastolic pressure at the descending section of pulse wave amplitude strength envelope.
Working principle of digital sphygmomanometer
During the inflation system of the motor, the internal management of the cuff generates learning pressure, and the digital temperature pressure is sensed by the sensor ASDX 001. After continuous amplification technology and related filtering processing circuits, it is read in by the first pin of the microcontroller 89C51 and converted to A/D. Under the control of the program, the microcontroller strictly requires pressure according to ASDX 001
The required work of the sensor is to analyze the timing data for reading and writing control. After reading the signal, the microcontroller performs calculations on the digital signal, and then the DM-162 LCD display function module can be used to develop the digital information display system output.