Korotkoff sound electronic blood pressure measuring instrument as well as active noise-canceling pickup device, system and method for Korotkoff sound electronic blood pressure measuring instrument

Abstract

The invention discloses a Korotkoff sound electronic blood pressure measuring instrument as well as an active noise-canceling pickup device, system and method for the Korotkoff sound electronic bloodpressure measuring instrument. The pickup device comprises a cuff and an airbag, wherein the airbag is arranged in the cuff, and the middle of the airbag is connected with an air guide pipe; stethoscope heads are arranged between the cuff and the airbag and located on two sides of a joint of the air guide pipe, respectively, and a sound transducer is placed in each stethoscope head; any one stethoscope head is aligned to a brachial artery part of an upper arm, the sound transducer in the stethoscope head is used for picking up Korotkoff sounds and external interference sounds, and the rest stethoscope head is not located at the brachial artery part of the upper arm and can only pick up external interference sounds; and the two identical stethoscope heads acquire the same external interference sounds to generate two interference sound signals with the same phase, frequency and amplitude to offset each other so as to obtain effective Korotkoff sound signals. By the effective Korotkoff sounds, the electronic blood pressure measuring instrument can realize high-accuracy blood pressure measurement values, misdiagnosis of blood pressure measurement caused by environmental noise factors can be thoroughly eliminated, and the physical health of people is protected.

Description

technical field [0001] The invention relates to the field of Korotkoff sound electronic blood pressure measuring instruments, in particular to an active noise reduction pickup device, method and system for Korotkoff sound electronic blood pressure measuring instruments. Background technique [0002] At present, various types of electronic blood pressure measuring instruments are widely used in clinics and homes in medical institutions due to their convenient use and operation. Among them, oscillometric (shock wave) electronic blood pressure measuring instruments occupy the largest share of electronic blood pressure measuring instruments in households. More than 80%. Then the old-fashioned Korotkoff sound mercury column blood pressure measuring instrument will almost withdraw from the market due to troublesome operation. In fact, the Korotkoff sound mercury column blood pressure measuring instrument uses the principle and method of the Korotkoff sound (the Korotkoff sound me...

AI Technical Summary

Problems solved by technology

[0005]1: The sound cover is a trumpet-shaped hollow cavity. This structure cannot hear the Korotkoff sound in the application of the sphygmomanometer, because generally when measuring blood pressure, the sphygmomanometer The cuff is wrapped around the elbow of the upper arm, usually wearing one or more layers of clothing. There is no closed resonant membrane on the opening of this trumpet-shaped hollow cavity, which is similar to the closed resonant membrane on the head of a medical stethoscope. After actual testing, no Korotkoff sound can be heard at all. Even if the latter stage is amplified again, it is only noise and interference signals, and no effective Korotkoff sound signal can be obtained.

[0006]2: The bearing part and the radio cover are superimposed together, and the height is too high, and they are placed at the bottom of the blood pressure cuff, so that the blood pressure cuff cannot be tightly wrapped around the upper arm, and the The blood flow of the brachial artery cannot be effectively blocked, and the effective Korotkoff sound cannot be measured; at the same time, the pressure of the cuff of the sphygmomanometer cannot be consistent with the pressure of the blood flow of the brachial artery, and the blood flow of the brachial artery cannot be measured. the real pressure of

[0007]3: The bearing part and the radio cover are two cavities with completely different structures. These two different cavities have different effects on external interference signals, so When the sound transducer 5 and the sound transducer 4 are placed inside to receive the same external interference sound, the output waveforms of the sound transducer 5 and the sound transducer 4 are completely different, which is equivalent to two different sounds in the Interference, you can't use interference to eliminate interference signals

[0008]4: The LMS adaptive filter can only filter out part of the noise, but cannot filter out interference signals. For example, when someone is talking outside or walking footsteps, This filter can't filter out this interfering sound

[0010]6: One audio codec per sound transducer, increasing system power consumption and cost

Since the sphygmomanometer is mainly for home use, it is more sensitive to price, and the high cost is unacceptable

The power consumption is too large, and it is inconvenient to change the battery or charge frequently

[0011]7: When a single radio cover is used, it can only be placed on a certain upper arm to measure blood pressure, because the blood pressure cuff also has an air pressure tube connected to the main unit. The joint of the cuff is as close as possible to the brachial artery of the upper arm, so that the air pressure can be quickly transmitted to the pressure sensor of the host. Since the brachial artery is on the inner side of the two upper arms, the Korotkoff sound transducer must be aligned with the brachial artery. Such a structure is bound to only adapt to one upper arm.

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