Blood pressure, as the name implies, refers to the pressure of blood in the blood vessels. The source of blood pressure is caused by blood flow caused by heart beats, and is affected by various factors such as blood vessel wall relaxation, body posture and the like.
The blood pressure in different parts of the body is different, and the blood pressure usually refers to the blood pressure of the upper arm.
Blood pressure fluctuates, natural blood pressure, mood, sitting posture, etc. can affect blood pressure values ​​in a short period of time, and the blood pressure values ​​of left and right hands may differ by 10 mmhg.
The sphygmomanometer is error-prone, including the Kurt's sound sphygmomanometer and electronic sphygmomanometer.
The blood pressure measured by the invasive insertion method is the most accurate.
The current requirements for the US sphygmomanometer standard AAMISP-10 are:
Compared with the Korotkoff method or the insertion method, the standard deviation is ≤8mmHg;
The average error is ≤ 5mmHg;
It is recommended that 85% of the measurement results have an error of less than 5 mmHg.
Smart bracelet to measure blood pressure accurately, always monitor your healthThe function of the smart bracelet is increasing, and there are already bracelets on the market that can measure blood pressure, which is good news for users in need. Do you know how the wristband measures blood pressure and is the measurement accurate?
Today's technology is developing more and more rapidly, and the functions of various electronic products are becoming more and more advanced. I still remember that when the wristband was first released, it only recorded the movement and sleep of the user's daily life. By now, the smart bracelet has broken through the original functions, and it can provide powerful services such as receiving WeChat messages, measuring pulse, and heart rate. This is a great benefit for those who are concerned about sports, or who have problems with their physical health, and those who need to keep an eye on their physical condition.
Nowadays, the smart bracelet on the market even has the function of blood pressure measurement, which is indeed a convenient product for patients with high blood pressure. However, can this small bracelet really reflect our accurate blood pressure? Let us first understand what the principle of measuring blood pressure in the bracelet is. It is reported that the current smart bracelet that can measure blood pressure is carried out in the following three ways: photoelectric sensor, photoelectric sensor plus ECG and oscillometric method.
Photoelectric sensors capture the pulse waves at our wrists and analyze them to estimate our blood pressure. This is also the method used by most bracelets on the market, because it is simple and convenient, and will not cause trouble to the user. The second is based on the photoelectric sensor plus the data collected by the ECG signal, and then comprehensive analysis. However, this method of collection is cumbersome and costly, and it is rarely used.
The oscillometric method is the same as the electronic blood pressure meter we usually use, and the blood pressure value is judged by a small pulse. Although the measurement is relatively accurate, the cost is high and the product volume is large, so it is rarely used. Therefore, the general wristband uses photoelectric sensors for blood pressure measurement, but the measurement results are actually in error and are for reference only.
Unmanaged POE Industrial Switches
PoE power supply switch refers to a switch that can provide network power supply for remote powered terminals through a network cable. It includes two functions: network switch and PoE power supply. It is a relatively common power supply device in PoE power supply systems.
PoE power supply switch refers to a switch that can provide network power supply to remote powered terminals through a network cable. It includes two functions: network switch and PoE power supply. It is a relatively common power supply device in PoE power supply systems. The port supports an output power of 15.4W, which conforms to According to the IEEE802.3af standard, the port supports an output power of 30W and conforms to the IEEE802.3at standard. It supplies power to standard POE terminal equipment through network cable power supply, eliminating the need for additional power wiring. A POE switch conforming to the IEEE802.3aT standard, the port output power can reach 15-60W. In layman's terms, a POE power supply switch is a switch that supports network cable power supply, which can not only realize the data transmission function of ordinary switches but also supply power to network terminals at the same time .
POE (Power Over Ethernet) means that without any changes to the existing Ethernet Cat.5 cabling infrastructure, it is used for some IP-based terminals (such as IP phones, wireless LAN access points AP, network Cameras, etc.) can provide DC power supply technology for such devices while transmitting data signals. The POE technology can ensure the normal operation of the existing network while ensuring the safety of the existing structured cabling, minimizing costs. POE is also known as a power supply system based on local area network (POL, Power over LAN) or Active Ethernet (Active Ethernet), sometimes also referred to as Power over Ethernet for short. This is the use of existing standard Ethernet transmission cables to transmit data and data at the same time. The latest standard specification of electric power, and maintains compatibility with existing Ethernet systems and users. The IEEE 802.3af standard is a new standard based on the POE of the Ethernet power supply system. It adds related standards for direct power supply through the network cable on the basis of IEEE 802.3. It is an extension of the existing Ethernet standard and the first international standard for power distribution. standard
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