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CN-122004822-A - Capacitive wearable noninvasive sensor and blood vessel blood flow change detection method

CN122004822ACN 122004822 ACN122004822 ACN 122004822ACN-122004822-A

Abstract

The invention provides a capacitive wearable noninvasive sensor and a blood vessel blood flow change detection method, and belongs to the technical field of blood vessel blood flow change monitoring. The two semicircular arc copper foil electrodes are respectively attached to two sides of a wrist of a human body, are opposite to each other and encircle the wrist of the human body. The self-adaptive variable-frequency excitation module is used for outputting alternating excitation signals with the frequency which can be adaptively adjusted within a set range to the two semicircular arc copper foil electrodes. A coupling capacitor is formed between the two semicircular arc copper foil electrodes and the wrist of the human body, the coupling capacitor generates a capacitance signal under the action of an alternating excitation signal, and the capacitance signal changes along with the arterial blood pulsation of the wrist of the human body to form a capacitance change signal. The programmable gain amplifying module is used for automatically adjusting the gain according to the intensity of the capacitance change signal. The invention solves the problem of low accuracy of detecting blood vessel blood flow change caused by lower detection accuracy of the traditional sensor in the prior art.

Inventors

  • HUANG XIANGFU

Assignees

  • 西安云深算智能科技有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. The capacitive wearable noninvasive sensor is characterized by comprising two semicircular arc copper foil electrodes, a self-adaptive variable frequency excitation module, a programmable gain amplification module and a signal acquisition interface; the two semicircular arc copper foil electrodes are respectively attached to two sides of the wrist of the human body, are arranged opposite to each other and encircle the wrist of the human body; the self-adaptive variable-frequency excitation module is used for outputting alternating excitation signals with the frequency which can be adaptively adjusted within a set range to the two semicircular arc copper foil electrodes; A coupling capacitor is formed between the two semicircular arc copper foil electrodes and the wrist of the human body, the coupling capacitor generates a capacitance signal under the action of the alternating excitation signal, and the capacitance signal forms a capacitance change signal along with the arterial blood pulsation change of the wrist of the human body; The programmable gain amplification module is used for automatically adjusting the gain according to the intensity of the capacitance change signal; The signal acquisition interface is used for transmitting the capacitance change signal after gain adjustment to the signal acquisition chip for conversion processing; The programmable gain amplification module is arranged between the signal acquisition interface and the signal acquisition chip.
  2. 2. The capacitive wearable noninvasive sensor of claim 1, wherein surfaces of the two semicircular arc-shaped copper foil electrodes are covered with an insulating layer.
  3. 3. The capacitive wearable noninvasive sensor of claim 2, wherein the insulating layer is a silicone insulating layer.
  4. 4. The capacitive wearable noninvasive sensor of claim 1, wherein the set range is 50 khz-150 khz.
  5. 5. The capacitive wearable noninvasive sensor of claim 1, wherein the gain adjustment is in a range of 1-8 times.
  6. 6. The capacitive wearable non-invasive sensor according to claim 1, characterized in that the automatically adjusting the gain according to the intensity of the capacitance change signal is in particular: When the pulse signal is weak and the strength of the capacitance change signal is smaller, the gain is improved; when the pulse signal is strong, resulting in a high intensity of the capacitance change signal, the gain is reduced.
  7. 7. The capacitive wearable non-invasive sensor according to claim 1, characterized in that the capacitive wearable non-invasive sensor is a flexible structure.
  8. 8. A method of vascular blood flow change detection using the capacitive wearable non-invasive sensor of claims 1-7, comprising the steps of: Coupling the alternating excitation signal with a capacitance change signal generated by blood pulsation of a wrist artery of a human body to obtain a coupled signal; After the intensity of the coupled signal is regulated, converting the coupled signal into a digital signal; Transmitting the digital signal to terminal equipment, and carrying out feature extraction on the digital signal in the terminal equipment to obtain heart rate features, pulse amplitude features, pulse waveform state features and hemodynamic features; Fusing heart rate characteristics, pulse amplitude characteristics, pulse waveform state characteristics and hemodynamic characteristics to obtain multidimensional characteristics; Inputting the multidimensional features into a trained physiological index analysis model to obtain a blood vessel blood flow change detection result.
  9. 9. The method according to claim 8, wherein after the blood vessel blood flow change detection result is obtained, an early warning strategy and an intervention strategy are set based on the blood vessel blood flow change detection result.
  10. 10. The method according to claim 9, wherein after the early warning strategy and the intervention strategy are set, health management is performed on the health condition corresponding to the blood pulsation of the wrist artery of the human body according to the early warning strategy and the intervention strategy.

Description

Capacitive wearable noninvasive sensor and blood vessel blood flow change detection method Technical Field The invention belongs to the technical field of blood vessel blood flow change monitoring, and particularly relates to a capacitive wearable noninvasive sensor and a blood vessel blood flow change detection method. Background With the aggravation of aging population and the change of life style, the problem of blood flow variation of blood vessels has become an important factor threatening human health, and the accompanying high morbidity, high health burden and high physiological risk are characterized remarkably. Early identification, continuous monitoring and scientific intervention aiming at key physiological states such as vascular elastic attenuation, hemodynamic imbalance, pulse wave conduction abnormality and the like are core keys for maintaining the steady state of a circulatory system and reducing health risks. At present, the traditional blood vessel blood flow change detection means mainly depend on special medical equipment such as an electrocardiogram, a sphygmomanometer and vascular ultrasound, and the like, so that the problems that detection scenes are limited, long-term continuous monitoring cannot be realized, the operation is complex, the assistance of professionals is needed and the like are difficult to meet the requirements of daily prevention of common people and home monitoring of high-risk people. The capacitance sensing technology has the advantages of no wound, high response speed, simple structure and integration, most of capacitance sensors are applied to the industrial field, are applied to the medical health field less, and are widely applied to the physiological monitoring equipment, and the capacitance sensors still have the defects of large volume, inconvenient wearing and inapplicability to daily health detection. Meanwhile, the existing intelligent wearable sensor is mainly a photoelectric sensor of photoplethysmography (PPG, photoplethysmography), can only monitor a single physiological index (such as heart rate), is spot-like detection, has limited detection range and precision, is greatly influenced by skin color, sweat and motion state, lacks high-precision signal processing capability, and cannot accurately detect blood vessel blood flow changes. Therefore, the capacitive sensor and the detection system which are stable in signal, accurate in detection, convenient and fast to wear and capable of realizing the full-flow detection of blood vessel blood flow change are developed, and have important practical significance and application value, and also accord with the current trend of intelligent medical science towards noninvasive, convenient and intelligent development. Disclosure of Invention The invention aims to provide a capacitive wearable noninvasive sensor and a blood vessel blood flow change detection method, which are used for solving the problem that the accuracy of blood vessel blood flow change detection is low due to lower detection accuracy of a traditional sensor in the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: In a first aspect, the invention provides a capacitive wearable noninvasive sensor, which comprises two semicircular arc copper foil electrodes, a self-adaptive variable frequency excitation module, a programmable gain amplification module and a signal acquisition interface; the two semicircular arc copper foil electrodes are respectively attached to two sides of the wrist of the human body, are arranged opposite to each other and encircle the wrist of the human body; the self-adaptive variable-frequency excitation module is used for outputting alternating excitation signals with the frequency which can be adaptively adjusted within a set range to the two semicircular arc copper foil electrodes; A coupling capacitor is formed between the two semicircular arc copper foil electrodes and the wrist of the human body, the coupling capacitor generates a capacitance signal under the action of the alternating excitation signal, and the capacitance signal forms a capacitance change signal along with the arterial blood pulsation change of the wrist of the human body; The programmable gain amplification module is used for automatically adjusting the gain according to the intensity of the capacitance change signal; The signal acquisition interface is used for transmitting the capacitance change signal after gain adjustment to the signal acquisition chip for conversion processing; The programmable gain amplification module is arranged between the signal acquisition interface and the signal acquisition chip. The invention is further improved in that the surfaces of the two semicircular arc-shaped copper foil electrodes are covered with an insulating layer. The invention further improves that the insulating layer is a silica gel insulating layer. The invention is further improved in tha