Method and system for measuring uterine contraction pressure by using air bag

Abstract

The invention relates to a method for measuring uterine contraction pressure by using an air bag, which includes: attaching the air bag containing a certain amount of gas to an abdomen of a pregnant woman; acquiring pressure signals generated under the action of the abdomen of the pregnant woman to the air bag by the aid of a gas pressure sensor connected with the air bag; and acquiring needed uterine contraction pressure signals from the pressure signals. The invention further relates to a system for measuring the uterine contraction pressure by the aid of the method. The system comprises the air bag, the gas pressure sensor and a signal processing device, wherein the air bag is used as a measuring probe, the gas pressure sensor connected with the air bag is used for acquiring the pressure signals on the air bag and converting the pressure signals into electric signals, and the signal processing device is used for processing the electric signals outputted by the gas pressure sensor. The signal processing device comprises a controller and a signal conditioning circuit, wherein the controller is capable of identifying the signals and distinguishing uterine contraction from fetal movement, and the signal conditioning circuit is used for filtering interference signals and amplifying the filtered signals. The method for measuring the uterine contraction pressure is simple, and high in reliability, and the measuring system is high in sensitivity, fine in linear performance, low in probe cost, economical and applicable.

Description

technical field [0001] The invention relates to a method for measuring uterine systolic pressure by using an air bag and a system for measuring uterine systolic pressure by using the method, which belong to the field of medical technology. Background technique [0002] The measurement of uterine systolic pressure is an important part of the fetal monitoring system. Its main function is to know whether pregnant women have uterine contractions and the intensity of uterine contractions. The commonly used uterine contraction pressure probes are piezoresistive sensors, which consist of four strain gauge It is connected in the form of a full bridge and pasted on the elastic element with an adhesive. When the external pressure is applied, the strain gauge is deformed, and the corresponding resistance value changes, so that the bridge is unbalanced, and a voltage proportional to the pressure is generated. The method of measuring the uterine systolic pressure It is to tie the...

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Problems solved by technology

[0002] The measurement of uterine systolic pressure is an important part of the fetal monitoring system. Its main function is to know whether pregnant women have uterine contractions and the intensity of uterine contractions. The commonly used uterine contraction pressure probes are piezoresistive sensors, which consist of four strain gauge It is connected in the form of a full bridge and pasted on the elastic element with an adhesive. When the external pressure is applied, the strain gauge is deformed, and the corresponding resistance value changes, so that the bridge is unbalanced, and a voltage proportional to the pressure is generated. The method of measuring the uterine systolic pressure It is to tie the uterine systolic pressure probe to the abdomen of the pregnant woman. When the uterus contracts, the pressure of the probe will increase, thereby measuring the size of the uterine systolic pressure; however, the following problems are often encountered when using this uterine systolic pressure probe: (1 ) Since the strain gauge is small, the contact area with the human body is also small, and it is also susceptible to the influence of elastic elements, so the sensitivity is not high, and the reliability of the measured data is not high; (2) The probe is directly connected to the measuring instrument through wires In fact, it is easy to cause external electromagnetic interference and attenuation of its own signal, which makes it more difficult to collect uterine contraction signals; (3) The sensor is installed on the probe, which is expensive when the user purchases it, which is easy to increase the economic burden of the user, and is not easy to be widely promoted

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