Superficial vascular tremor measurement method and device based on laser sensing

Abstract

The invention provides a superficial vascular tremor measurement method and device based on laser sensing. The method comprises the steps: collecting a superficial vascular tremor signal in a non-contact manner through one or two laser sensors, and obtaining a pure tremor signal through the restoration of a median filtering and / or adaptive filtering method. The measured superficial vascular tremorcan be tremor caused by pulse, arteriovenous fistula tremor and the like. The device is provided with one or two laser sensors for selective work, superficial vascular tremor signals can be extractedthrough cooperation of single laser and a median filter, and human body tremor signals can also be filtered through cooperation of double laser and adaptive filtering, so that pure superficial vascular tremor signals caused by disease physiology are obtained.

Description

technical field [0001] The present invention relates to the field of signal detection methods and equipment, in particular to a method and device for measuring tremors of superficial blood vessels based on laser sensing, which can measure superficial blood vessels, especially vibration signals transmitted to the skin surface during arteriovenous fistula tremors . Background technique [0002] Explanation of terms: [0003] Superficial vascular tremor: Superficial vascular tremor is a subtle vibration felt by fingertips during palpation, such as tremor caused by pulse; it may also be a characteristic sign of the disease, such as superficial tremor caused by arteriovenous fistula. The occurrence of tremor is that when the blood flows through a narrow caliber or flows in an abnormal direction, a vortex is formed to cause the vibration of the blood vessel wall to spread to the skin surface. [0004] Arteriovenous fistula: An arteriovenous artery with a similar distance is subc...

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Problems solved by technology

However, this method still needs to be measured close to the skin, which may cause compression on the internal fistula

[0015] In the aforementioned protocol for measuring pulse-induced tremors, photoplethysmography is essentially a recording of changes in blood volume, not tremors, and this method cannot measure tremors caused by blood flow impinging on blood vessels

In addition, due to the inevitable movement of the measurement site, the interference of natural light, fluorescent lamps and other light sources in the surrounding environment will lead to further inaccurate results

[0016] Although the stethoscope measurement method can collect the acoustic characteristics of the internal fistula, it is obviously affected by the environment, and it is easy to mix the noisy signal of the external environment with the normal signal, which affects the judgment of the internal fistula state. The auscultation method cannot effectively extract the infrasound in the signal Element

[0017] Using an acceleration sensor, the constant velocity part or small acceleration part of the tremor signal cannot be collected, and the signal cannot correctly reflect the vascular pathophysiological information contained in the measurement point

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