Method for determining sound intensity peak slopes of originating point and vanishing point of Korotkoff sounds

Abstract

The invention relates an improved medical detection method, in particular to a method for determining sound intensity peak slopes of an originating point and a vanishing point of Korotkoff sounds. The method comprises the following steps: using an electronic sound pick-up to acquire the Korotkoff sounds, performing filtration and preliminary noise reduction, eliminating data which falls short of judgment basis of the Korotkoff sounds according to a program, selecting a set of complete Korotkoff sound spectrum, simultaneously ruling out interference signals again according to the judgment basis, and getting a background noise line which is nearly horizontal; and then crossing the slopes of front two peaks of the first phase and the slopes of back two peaks of the fourth phase of the Korotkoff sounds with the background noise line through the program, getting crossing points which are the theoretical originating point and the theoretical vanishing point of the Korotkoff sounds and finally determining corresponding systolic blood pressure and diastolic blood pressure according to the points. By adopting the method, the interferences of noise to the Korotkoff sounds can be almost completely ruled out, the blood pressure can be automatically measured through the Korotkoff sound method, gasbag decompression random error and error caused by a threshold of sound can also be eliminated, and the blood pressure can be accurately measured.

Description

technical field [0001] The invention relates to an improvement of a method for non-invasive detection of blood pressure, specifically a method for determining the peak slope of the sound intensity at the origin point and vanishing point of the Korotkoff sound. Background technique [0002] There are more and more people with high blood pressure at present, and people hope to have a kind of equipment that can measure blood pressure accurately. The existing mercury sphygmomanometer using the Korotkoff sound method is more accurate, but it is not convenient for home use and may cause mercury pollution; the existing electronic sphygmomanometer is easy to use, but it is easily disturbed by external noise when measuring with the Korotkoff sound method Therefore, the existing electronic sphygmomanometer has to use the oscillation method to calculate the blood pressure indirectly by measuring the oscillation wave in the air pressure of the cuff. The principle of this method determi...

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Problems solved by technology

[0004] In use, how to determine the starting point and vanishing point of the Korotkoff sound can only be heard by the human ear in the past, and the first sound is taken as the occurrence point, and the pressure measured at this time is defined as the systolic pressure. This is not controversial; however, whether to choose the pressure at the time of sound change or the corresponding pressure at the final silence is a problem that can never be concluded: because in the past it was directly heard by the human ear, sometimes the sound change is heard. Difficult, and does not meet the definition of Korotkoff sound, and the final sound definition is the sound of no sound, it is difficult for the human ear to determine the exact time when this "silence" occurs

[0008] At present, with the development of electronic technology, it is easy to record the graph of the whole process of Korotkoff sound from occurrence to disappearance. Using the graph of this process, compared with the record of the real-time pressure of the air bag synchronously, it is not difficult to manually find out the corresponding The systolic and diastolic blood pressure values ​​defined by the current non-invasive blood pressure. This method can solve the controversy described in [0004] technically, but it is far less convenient than the existing digital electronic sphygmomanometer for direct reading

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