CN107692987A - Object wearing device for physical sign parameters collection - Google Patents

Abstract

The invention discloses a wearable device for collecting physical sign parameters, which includes a wearable garment, and an electrocardiographic parameter sensing node, a pulse parameter sensing node, and a number of sensor nodes respectively connected to the electrocardiographic parameter sensor set on the wearable garment. The electrocardiographic electrodes connected to the sensing nodes by communication, and the electrocardiographic parameter sensing nodes and the pulse parameter sensing nodes are all equipped with a signal acquisition and processing module, a microcontroller and a wireless communication module. The two nodes work independently, respectively responsible for the collection, processing and transmission of ECG and pulse signals; they can continuously collect, process and transmit ECG, pulse, blood pressure and other important sign parameters in real time, and at the same time solve the problem of traditional wearable blood pressure monitoring system equipment Complicated, inconvenient to carry, bring discomfort to the testee, cumbersome signal calculation and processing and other problems.

Description

Wearable device for physical sign parameter collection

technical field

The invention relates to a sign parameter collection device, in particular to a wearable device capable of collecting, processing and transmitting electrocardiogram, pulse and blood pressure.

Background technique

With the continuous improvement of people's living standards and changes in diet structure, cardiovascular and cerebrovascular diseases pose an increasingly serious threat to human health, and hypertension has become the primary risk factor for cardiovascular and cerebrovascular diseases. According to the data released by the World Health Organization "Global Summary of Hypertension", about 1 billion people over the age of 25 in the world are affected by high blood pressure, exceeding 40% of the total, and the number of deaths caused by high blood pressure and complications every year reaches 9.4 million people, the death toll of hypertensive diseases accounts for the first place in the death toll due to diseases. According to the "China Cardiovascular Disease Report 2015" issued by the National Center for Cardiovascular Diseases, the prevalence of hypertension in Chinese adults over the age of 18 is 33.5%, and the total number of people is about 330 million. Every year, the direct medical expenses of high blood pressure in my country are as high as 36.6 billion yuan, and the number of deaths caused by high blood pressure is as high as 2 million. The prevalence of high blood pressure shows a clear upward trend. Due to the younger incidence of hypertension and the aging population, there are a huge number of new hypertensive patients every year. Therefore, the prevention, diagnosis and treatment of hypertension has become an important subject of medical research.

For the monitoring and early warning of cardiovascular patients, the best existing method is long-term uninterrupted monitoring of blood pressure parameters. However, direct blood pressure measurement requires a long preparation time and is prone to complications, so it is not suitable for long-term blood pressure monitoring. Traditional intermittent measurement methods, such as Korotkoff sound auscultation and oscillometric method, can better reflect the measurement results, and are also commonly used standards for clinical and scientific research references, but the disadvantages are that there are many human factors and can only be measured once. Real-time monitoring capability. And these two kinds of blood pressure measurement processes must use the inflatable cuff for intermittent inflation. The inflatable cuff will cause discomfort to the patient due to the compression of the blood vessel, and the real-time blood pressure of the human body cannot be obtained immediately, and it cannot be measured again immediately after the measurement. Use and carry are not convenient.

The wearable blood pressure monitoring system has the characteristics of small size and detachable sensor. The system is simple and portable, and there is no need to wear an inflatable cuff for intermittent inflation during measurement. The measurement error caused by the tightness of the size. The wearable blood pressure measurement system can continuously measure blood pressure and observe changes in blood pressure over a period of time. It can obtain the basic information of the human body in a natural state, has good human-computer interaction, and is a safety detection technology with low physiological and psychological load.

Patent CN201510785492.4 discloses a "body-worn system for measuring continuous non-invasive blood pressure", which provides a technique for continuous measurement of blood pressure, based on pulse transit time and which does not require any additional calibration. This technique (referred to herein as the 'composite approach') is performed using a body-worn monitor that measures blood pressure and other vital signs and transmits them wirelessly to a remote monitor. A network of body-worn sensors, typically placed on the patient's right arm and chest, interface with body-worn monitors and measure time-dependent ECG, PPG, accelerometer, and pressure waveforms. The single-use sensor may include a cuff featuring an inflatable bladder coupled to a pressure sensor, three or more electrical sensors (eg, electrodes), three or more accelerometers, a temperature sensor, and an attached to a light sensor (eg, light source and photodiode) on the patient's thumb.

However, the existing technology has the following defects: the cuff type with an inflatable air bag is used, the hardware equipment is complex and inconvenient to carry, and the stimulation and discomfort brought by the cuff and inflation pressure to the testee will affect the blood pressure measurement results . The method of calculating blood pressure from the pulse wave signal includes cumbersome calibration steps and calculation steps, and requires high computing power of hardware devices.

Contents of the invention

Purpose of the invention: The present invention provides a wearable device for collecting physical signs, which can continuously collect, process and transmit important physical parameters such as ECG, pulse, and blood pressure in real time, and at the same time solve the problem of complex equipment in traditional wearable blood pressure monitoring systems. , Inconvenient to carry, bring discomfort to the tested person, cumbersome signal calculation and processing and other problems.

Technical solution: The wearable device used for collecting physical sign parameters of the present invention includes a wearable garment, and an electrocardiographic parameter sensing node, a pulse parameter sensing node, and a number of sensor nodes respectively connected to the electrocardiographic parameter are arranged on the wearable garment. The electrocardiographic electrodes connected to the sensing nodes by communication, and the electrocardiographic parameter sensing nodes and the pulse parameter sensing nodes are all equipped with a signal acquisition and processing module, a microcontroller and a wireless communication module.

The wearable device for collecting physical sign parameters of the present invention integrates the measurement of the three important physical sign parameters of ECG, pulse and blood pressure into a wearable measuring device on clothing in the form of independent nodes; the two nodes work independently, and are responsible for ECG, Acquisition, processing and transmission of pulse signals; the monitoring center is a mobile phone or PC, which receives the data transmitted by the node through Bluetooth and performs secondary processing to obtain continuous data information of blood pressure, ECG and pulse. After receiving the ECG signal and pulse signal, calculate the ECG and R wave peak values of the ECG signal, and calculate the PPG wave peak value of the photoplethysmographic pulse wave signal; calculate the pulse wave transit time PWTT value, and obtain the blood pressure systolic blood pressure SBP value through the PWTT value calculation , and the DBP value of blood pressure and diastolic blood pressure is calculated by pulse wave shape coefficient K, heartbeat period T, heartbeat diastolic period Td and SBP.

Photoplethysmography (PhotoPlethysmoGraphy, PPG) is a non-invasive detection method that detects changes in blood volume by photoelectric means to obtain pulse waves. Absorption, and transmitted to the photoelectric receiver by transmission or reflection. The absorption of light by skin, muscle, tissue, etc. remains constant throughout the blood circulation, while the blood volume in the blood vessel changes pulsatingly under the action of heart contraction and relaxation.

The pulse parameter sensing node is mainly composed of a pulse sensor signal acquisition circuit and a signal processing circuit. The pulse sensor uses a green light sensor to collect signals. This node uses a green light sensor as an excitation to improve the signal receiving sensitivity. The pulse is measured by the photoelectric volumetric method. Wave. After using the signal acquisition and processing module to obtain the pulse signal of the radial artery at the human wrist, first pass the signal through the signal conditioning circuit to obtain a voltage signal suitable for A/D conversion, and then use the software on the single-chip microcomputer to perform the required processing on the pulse data. The analysis and parameter calculation are finally uploaded to the monitoring center by the Bluetooth communication module, so as to monitor the pulse parameters of the human body in real time.

In order to facilitate the replacement of the ECG parameter sensing node and the pulse parameter sensing node, the ECG parameter sensing node and the pulse parameter node can be detachably arranged on the wearable garment.

Wherein, the ECG parameter sensing node is detachably arranged on the left chest of the wearable clothing through the first box body, and the first box body includes an upper cover and a lower cover that can be snapped together, and one of the covers It is detachably arranged on the wearable garment, and an insulating glue capable of sealing the gap between the upper cover and the lower cover is provided for blocking circuit interference.

The pulse parameter sensing node is placed in the second box body, and is detachably set on the left wrist of the wearable clothing in the form of a bracelet, and the second box body has a light inlet hole for the signal acquisition and processing module The photodiode lighting work.

There are three ECG electrodes, which are respectively located on the upper part of the left sternum and clavicle, the upper part of the right sternum and the right abdomen of the wearable garment. The three ECG electrodes set on the upper part of the left sternum and clavicle, the lower part of the right sternum and the right abdomen respectively collect the ECG signals of the left hand, right hand and right leg, and the ECG signals are amplified and processed by the analog front-end chip and the physiological parameters microcontroller The band-pass filtering process is finally uploaded to the monitoring center by the Bluetooth communication module, so as to monitor the ECG parameters of the human body in real time.

At the same time, ECG electrodes use dry conductive fabric electrodes instead of traditional wet electrodes. These electrodes have the characteristics of soft and elastic fabrics, and are friendly and will not irritate the skin. The electrocardiographic electrode adopts a three-layer structure of a conductive fabric sensing layer, an elastic support layer and a base layer in sequence from the skin layer to the outside. Compared with the existing electrode composed of support pad with hard sponge and soft sponge wrapped in conductive fabric, the thickness of the ECG electrode is significantly reduced, the wearing comfort is effectively improved, and the wear resistance of the electrode is also reduced. Production cost; the use of the base layer can facilitate the sewing of the ECG electrodes on the inner side of the wearable; the use of the elastic support layer can provide elastic support for the conductive fabric sensing layer, so that the conductive fabric sensing layer can always be close to the surface of the human skin , improve the reliability and effectiveness of signal acquisition.

Each of the ECG electrodes is respectively connected to the ECG parameter sensing node through a fabric wire, and the fabric wire includes a conductive fabric transmission line, and an insulating waterproof layer and a cotton cloth that wrap the outer edge of the conductive fabric transmission line from the inside to the outside in turn. Floor. The insulating and waterproof layer further shields noise and ensures the stability of signal transmission. The inner core of the fabric wire is made of the same material as the ECG electrode, and the outer layer is wrapped with an insulating layer and a cotton protective layer. The protective layer is made of the same material as the tights.

Beneficial effects: 1. The wearable device for collecting sign parameters of the present invention is a complete set of sign monitoring system, which realizes real-time receiving and processing of ECG data and pulse wave data, real-time calculation of blood pressure value, file storage, signal waveform display, abnormal heart rate Electrical signal recognition and remote early warning functions; 2. The equipment is simple, reducing the demand for hardware facilities; 3. The wearable device for collecting physical signs parameters of the present invention is suitable for both hospitals and personal use, and is comfortable to wear and easy to carry; 4. Each The measurement nodes work independently without affecting or interfering with each other; 5. The nodes are detachable, replaceable, and easy to use.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the cross-section (a) and longitudinal section (b) of the central electrical parameter sensing node of the present invention;

Fig. 3 is a schematic diagram of the structure of the bottom surface of the pulse parameter sensing node in the present invention;

Fig. 4 is the schematic diagram of the cross-sectional structure of the central electric electrode of the present invention;

Fig. 5 is a schematic diagram of the cross-sectional structure of the fabric wire in the present invention.

detailed description

Referring to FIG. 1 to FIG. 5 , the wearable device for collecting physical sign parameters of the present invention includes a wearable garment 1 , an ECG parameter sensing node 2 , a pulse parameter sensing node 3 , three ECG electrodes 4 and a fabric wire 8 .

The wearable garment 1 is an elastic tights, and the ECG parameter sensing node 2 is installed on the left chest of the wearable garment 1, including an ECG signal acquisition and processing circuit, a microcontroller and a Bluetooth communication module connected to it; the ECG parameter sensing node 2 There are 3 signal input terminals and 3 fixing nuts on the lower surface, the 3 signal input terminals are respectively connected to the 3 ECG electrodes 4 through 3 fabric wires 8, and the 3 fixing nuts are used to fix the nodes on the clothing 1 ; The three ECG electrodes 4 are all sewn in the wearable garment 1, and are respectively located at the upper part of the left sternum and clavicle, the upper part of the right sternum and the right abdomen.

A node interface 9 for signal input and a concealed buckle 10 for fixing are provided at each signal input end and the fixing nut, and the three node interfaces 9 are respectively connected to the three ECG electrodes 4 through fabric wires 8, and the node interfaces 9 are in the form of The included angle of 120° is evenly distributed on the concentric circles; the hidden buckle 10 is composed of a concave part and a raised part, the concave part is a female buckle, and the raised part is a male buckle.

Embed the ECG parameter sensing node 2 into a circular plastic box body 5 with a thickness of 1.5-2 cm and a diameter of 4.4 cm. The box body 5 is divided into an upper and a lower cover body that can be butted and packaged through an internal screw column 13. The node interface 9 at the bottom of the body 5 is embedded with a male button, and the female button and the node interface are sewn on the wearable garment 1 in one-to-one correspondence. The upper and lower covers are sealed with insulating glue 11 to block circuit interference.

The electrocardiographic electrode 4 includes a base layer 4-3, an elastic support layer 4-2 and a conductive fabric sensing layer 4-1, which are sequentially arranged from the inner side of the wearable garment 1 toward the skin. Wherein, the elastic support layer 4-2 is a memory foam, the conductive fabric sensing layer 4-1 is a silver-impregnated conductive fabric, and the elastic support layer 4-2 contains a fabric wire that runs through the conductive fabric sensing layer 4-1 , for ECG signal transmission.

The fabric wire 8 includes a conductive fabric transmission line 8-1 and a cotton cloth layer 8-3 concentrically arranged from the inside to the outside, and there is also an insulating waterproof layer 8-2 (insulated waterproof nylon layer 8-2) between the conductive fabric transmission line 8-1 and the cotton cloth layer 8-3. layer) for noise shielding to ensure the stability of signal transmission.

The pulse parameter sensing node 3 includes a photoelectric pulse signal acquisition and processing circuit, a microcontroller and a Bluetooth communication module connected to it, embedded in a rectangular plastic box 6 with a length, width and height of 2.5 cm, 2 cm, and 0.7 cm, forming a modularized Design; placed on the inner side of the left wrist of the wearable 1, the inner surface is in contact with the human skin surface, and designed as a wristband, the tightness can be adjusted; the rectangular plastic box body is divided into upper and lower boxes, through the built-in rectangular slot 12 For fixing and docking, a rectangular light inlet 7 with a length of 1.2 cm and a width of 0.8 cm is provided on the inner surface for lighting the photodiode.

When the device of the present invention is made, the wearable clothing 1 adopts a comfortable fabric with better elasticity and air permeability; the base layer 4-3 of the electrocardiographic electrode 4 adopts convenient cutting and sewing technology processing, which is less irritating to the skin, has good elasticity and Comfortable fabrics with better air permeability; the cotton layer 8-3 of the fabric wire 8 is made of the same material as the wearable clothing 1; the conductive fabric transmission line 8 of the conductive fabric sensing layer 4-1 of the ECG electrode 4 and the fabric wire 8 -1 Conductive fabrics of the same material are used, all of which are silver-impregnated conductive fabrics HTL-1 produced by Qingdao Hengtong Weiye Special Fabric Technology Co., Ltd. The surface resistance of this conductive fabric measured under the GB1410-2006 standard is 0.1Ω, according to GB /T12703-1991 standard surface resistance after washing 100 times is 0.7Ω, which has the characteristics of low impedance, good stability, and tensile resistance. Therefore, this design chooses HTL-1 conductive fabric material as the core material of ECG electrodes and transmission wires.

The working principle of the present invention is as follows:

The internal working process of the ECG parameter sensing node 2 is as follows: the ECG signals of the left hand (the upper part of the left sternum-LA), the right hand (the upper part of the right sternum-RA) and the right leg (the right abdomen-RL) are collected by the ECG electrode 4. Input the ECG signal through the node interface 9 respectively, and the analog front-end chip AD8232 performs amplification, filtering, etc. The gain amplifier and the right leg drive circuit can effectively amplify the ECG signal at a low signal-to-noise ratio, because the distance from the heart to the AD8232 is very short, so the heart signal is very strong and the muscle artifact interference is small); then the processed The ECG signal is sent to the low-power microprocessor MSP430F1611; then the signal is sent to the mobile terminal of the monitoring center through the HC-05 Bluetooth module that meets the Bluetooth 2.1 standard in the form of UART communication.

The pulse parameter sensing node 3 completes the collection and preliminary processing of the pulse signal, and sends the processed pulse signal to the low-power microprocessor MSP430F1611 through the fabric wire 8; through the built-in 12-bit analog-to-digital converter, the digitized ECG And the pulse signal is processed by a 0.5-40Hz IIR and FIR combined digital bandpass filter inside the low-power microprocessor MSP430F1611, and then the signal is sent to the monitor through the HC-05 Bluetooth module that meets the Bluetooth 2.1 standard in the form of UART communication. Center mobile terminal.

After the obtained ECG signal and pulse wave signal are transmitted to the mobile phone via Bluetooth, the mobile client will perform the following steps to calculate the peak value of the ECG signal and R wave, calculate the peak value of the PPG signal; calculate the PWTT value, and calculate the PWTT value Get the SBP value, and calculate the DBP value through K, T, Td and SBP (Explanation: ECG electrocardiogram, PPG photoplethysmography, PWTT pulse wave transit time, SBP blood pressure systolic pressure, DBP blood pressure diastolic pressure, K pulse wave waveform Coefficient, T heartbeat period, Td heartbeat diastolic period, R wave peak value in ECG). The obtained blood pressure and diastolic pressure will be displayed on the mobile terminal interface together with the ECG signal and pulse wave signal, and the monitoring center can further provide the monitored ECG signal, pulse signal and blood pressure diastolic pressure to the user through the connected public network. For users as a standard for health monitoring.

Claims (10)

1. A wearable device for physical sign parameter acquisition, characterized in that: it comprises a wearable garment (1), and an electrocardiographic parameter sensing node (2) and a pulse parameter sensing node (2) arranged on the wearable garment (1) Node (3) and some electrocardiographic electrodes (4) that are respectively connected to the electrocardiographic parameter sensing node in communication, and the electrocardiographic parameter sensing node (2) and the pulse parameter sensing node (3) are all equipped with Signal acquisition and processing module, microcontroller and wireless communication module. 2. The wearable device for collecting physical sign parameters according to claim 1, characterized in that: the ECG parameter sensing node (2) is detachably arranged on the wearable clothing ( 1) at the left chest. 3. The wearable device for collecting physical sign parameters according to claim 2, characterized in that: the first box (5) includes an upper cover and a lower cover that can be snapped together, and one of the covers can be The dismounting is arranged on the said wearing clothes (1). 4. The wearable device for collecting physical sign parameters according to claim 1, characterized in that: the pulse parameter sensing node (3) is placed in the second box body (6), and is detachable in the form of a bracelet is located at the left wrist of the wearing garment (1). 5. The wearable device for collecting physical sign parameters according to claim 4, characterized in that: the second box body (6) has a light inlet hole (7). 6. The wearable device for collecting physical sign parameters according to claim 1, characterized in that: the pulse parameter sensing node (3) uses a green light sensor to collect signals. 7. The wearable device for collection of physical sign parameters according to claim 1, characterized in that: the ECG electrodes (4) are provided with three, and are respectively located on the upper part of the left sternum and clavicle of the wearable clothing (1) , the upper part of the right sternum and clavicle, and the right abdomen. 8. The wearable device for collecting physical sign parameters according to claim 1, characterized in that: the electrocardiographic electrode (4) comprises a conductive fabric sensing layer (4-1), an elastic A support layer (4-2) and a base layer (4-3). 9. The wearable device for collecting physical sign parameters according to claim 1, characterized in that: each of the ECG electrodes (4) connects with the ECG parameter sensing node (2) through a fabric wire (8) respectively. connect. 10. The wearable device for collecting physical sign parameters according to claim 9, characterized in that: the fabric wire (8) includes a conductive fabric transmission line (8-1), and wraps the conductive fabric sequentially from the inside to the outside The insulating waterproof layer (8-2) and the cotton cloth layer (8-3) on the outer edge of the transmission line (8-1).