CN211270698U - Flexible pulse sensor - Google Patents

Abstract

The utility model discloses a flexible pulse sensor. The sensor comprises a flexible conductive substrate, a flexible sensitive layer and a sensing layer stacked in sequence from bottom to top. Finger electrodes, the three-finger electrodes are respectively corresponding to the three pulse-taking positions of Cun, Guan and Chi in traditional Chinese medicine. The flexible pulse sensor of the utility model collects the pulse signal at the radial artery of the human wrist by setting three-finger electrodes to simulate three pulse-taking positions of the middle cun, close and chi in the pulse diagnosis of traditional Chinese medicine, and judges the physiological physiology of the human body by analyzing the pulse signal at the radial artery. Health, improve the objectivity of TCM pulse diagnosis; by simultaneously taking pulses from three parts of the radial artery, cun, guan, and chi, the detection sensitivity of the human pulse signal is greatly improved. In addition, the sensor has the advantages of simple structure, light texture, not easy to fall off, low manufacturing cost, simple operation, and stable and reliable detection results.

Description

A flexible pulse sensor

technical field

The utility model belongs to the technical field of sensors, in particular to a flexible pulse sensor.

Background technique

Pulse is a symbol of the rhythm of human arterial beating, such as speed, size, strength, ups and downs, virtual and real, etc. The pulse of human body is regarded as the language of life by Chinese medicine because it contains rich information on health status, so it has been paid more and more attention by Chinese and foreign medical circles. The comprehensive information presented by the pulse wave, such as waveform, amplitude, wave speed and period, reflects many blood flow characteristics in the human cardiovascular system to a large extent.

At present, there are also some reports of wearable medical fabrics used for monitoring physiological signals at home and abroad, such as the "life shirt" developed by VivoMetrics in the United States, which can reflect the wearer's breathing and record the body position changes, but it is not easy to wear and complicated to operate. , Not suitable for use in daily life and work; Italian MiliorofPrado company combines intelligent sensors in the form of fibers or yarns with fabric technology to monitor breathing and body temperature, but the price is high and the comfort of wearing in daily life is not good, affecting Its practicality; the T-shirt with sensing function developed by FraunhoferIZM in Germany can detect the electrophysiological parameters of the wearer's heart, but long-term contact with the skin will cause skin ulceration. Other pulse detection instruments in the prior art also have problems such as complicated operation, high cost, inconvenience to carry, unable to meet daily monitoring needs, poor biocompatibility, and uncomfortable wearing.

The arterial blood vessels in the human body appear periodic pulsation with the contraction and expansion of the heart. Since the pulse wave starts from the heart and is affected by arterial reflection and various physiological factors such as vascular resistance and fluid viscosity, the pulse signal contains a variety of Human health parameters, such as blood pressure and heartbeat, can reflect rich physiological and pathological information of the cardiovascular system through pulse diagnosis. At first, doctors chose the universal diagnosis method to examine all the relevant arteries in the three parts of the head, hands and feet. This method of diagnosis takes a long time. Zhang Zhongjing proposed three diagnostic methods, through the diagnosis of Renying, Cunkou, and Poyang three meridians. Among them, Cunkou is located where the original acupoint of the Lung Meridian of Hand Taiyin is located, which is the meeting of the meridians, and "the lungs go to the hundred meridians", the qi and blood of the five zang-organs and twelve meridians all start and end in the lung. Therefore, the Cunkou meridian can It reflects the pathological changes of Qi and blood of the internal organs and twelve meridians. On the other hand, the Lung Meridian of Hand Taiyin originates from the middle Jiao, belongs to the same Taiyin as the spleen, and communicates with the spleen, and the spleen is the foundation of acquired nature and the source of qi and blood biochemistry, so the rise and fall of qi and blood of the viscera can be reflected in the cun mouth. Therefore, Cunkou pulse diagnosis has a more accurate diagnosis and treatment effect than other diagnosis methods.

However, most of the inheritance of TCM's experience in Cunkou pulse diagnosis for thousands of years is through doctors' oral or qualitative records, and there are few quantitative expressions or classifications. The pulse information is often obtained by doctors pressing the patient's radial artery with their fingers. In order to obtain the pulse information of the patient, and then judge the condition of the patient. This brings a lot of inconvenience to the determination, transmission and storage of the patient's pulse information, because different doctors have different or even very different views on the same patient's pulse, and these views are only based on personal experience and are subjective. Strong, it is difficult to have quantitative data support. Furthermore, this perceived information cannot be objectively expressed. Modern medicine pays more and more attention to quantitative and objective research. It is difficult for the TCM pulse diagnosis to be recognized by Western medicine only based on the doctor's personal pulse cutting, and it is impossible to push the TCM pulse diagnosis to an international level. Therefore, how to make TCM pulse diagnosis technology more objective and quantitative on the basis of "overall concept" and "treatment based on syndrome differentiation", combined with various new technologies of modern science and technology, is a long way to go in TCM pulse diagnosis research. arduous task.

The study found that the mechanical structure of the existing TCM pulse detection system is mainly based on the wristband structure. This structure will lead to the blocking of pulse fluctuations when the pressure is higher than a certain pressure value, and cannot truly restore the "floating and sinking" TCM pulse diagnosis. Thought. In addition, most of the existing products are mainly single-point pulse wave sensors, and their single-point structure cannot reflect the theoretical viewpoint of "Cun Guan Chi" in traditional Chinese medicine, and requires the user to maintain a stable and calm state during measurement, which has a great impact on the use environment. requirements, thus limiting its popularization. Secondly, most of the existing traditional Chinese medicine pulse diagnosis instruments on the market are bulky and expensive. They need to combine the professional knowledge of doctors to determine the boundary between disease and non-disease. They are only suitable for use in large hospitals and cannot be extended to the general population. unable to meet market demand. Therefore, it is particularly important to develop a popular, scientific and convenient pulse monitoring tool.

Utility model content

The purpose of the utility model is to provide a flexible pulse sensor for the deficiencies existing in the prior art.

For realizing the above-mentioned purpose, the technical scheme that the utility model adopts is:

A flexible pulse sensor includes a flexible conductive substrate, a flexible sensitive layer and a sensing layer stacked in sequence from bottom to top, the flexible sensitive layer includes three-finger electrodes for taking pulses arranged side by side at intervals, the three-finger The electrodes correspond to the three pulse-taking positions of Cun, Guan, and Chi in TCM.

Preferably, the flexible sensitive layer is divided into an upper layer and a lower layer, the upper layer is a flexible conductive layer, the lower layer is a flexible insulating layer, and the upper layer and the lower layer are bonded together; the insulating layer is attached to the flexible conductive substrate, so The sensing layer is covered and attached to the upper part of the flexible conductive layer.

Preferably, the flexible sensitive layer is provided with a plurality of holes, the holes are located on the contact surface of the three-finger electrode and the flexible conductive substrate, and the sensing layer passes through a plurality of holes arranged on the flexible sensitive layer. A hole connects the flexible conductive substrate with the flexible sensitive layer.

When a person's index finger, middle finger and ring finger act on the three-finger electrodes by pressing the flexible base electrodes, the sensing layer is in close contact with the conductive layer of the flexible sensing layer, and at the same time the sensing layer passes through the flexible base. Several holes are in close contact with each other. At this time, the sensing layer acts as a wire to conduct the flexible substrate and the flexible sensitive layer; the sensing layer will deform under the force of finger pressing and pulse beating, and its impedance changes, so that the human pulse signal can be obtained by measuring the current-time curve of the sensor.

Preferably, several of the holes have the same shape and are arranged equidistantly.

In the present invention, several of the holes are through holes, and in the non-working state, the several holes make the flexible conductive substrate and the flexible sensitive layer in a non-conductive state; when used for pulse testing, by pressing The sensing layer, several holes arranged on the flexible sensing layer will be used as wires to make the flexible conductive substrate conduct with the flexible sensing layer.

Preferably, the diameter of several of the holes ranges from 0.1 mm to 30 mm.

Preferably, the edges of the flexible conductive substrate and the three-finger electrodes extend outward to form the first electrode and the second electrode, respectively.

During the pulse test, the first electrode is used as the counter electrode, and the three second electrodes are used together as working electrodes to connect with the electrochemical workstation to scan the current-time curve. And through the current peak intensity to infer the strength of the human pulse.

Preferably, the flexible conductive substrate and the three-finger electrodes are in the shape of stepwise increasing width. On the one hand, it is convenient to connect to the electrochemical workstation during testing, and at the same time, it can save the cloth and avoid the conduction between the flexible conductive substrate and the three-finger electrode in the non-working state, which reduces the service life of the flexible pulse sensor.

Preferably, the flexible conductive substrate and the flexible conductive layer are fiber cloth coated with nano silver wires.

Preferably, the sensing layer is one of conductive fiber cloth, conductive rubber or conductive sponge.

Preferably, the flexible insulating layer is a polymer film composed of at least one component of polyvinyl alcohol, polyester, nylon, acrylate, epoxy and polyurethane.

In the utility model, the thickness of the flexible conductive substrate, the flexible conductive layer and the flexible insulating layer is 0.05-10 mm, which has good ductility, friction resistance, corrosion resistance and weather resistance, and the cost is low, which is easy to popularize and popularize. It has a high market application prospect.

Preferably, the area of the flexible pulse sensor is 6-8 square centimeters, and the shape of the flexible sensor is a square, a circle or an ellipse.

The pulse testing method of the flexible pulse sensor of the utility model is as follows: the first electrode and the second electrode of the pulse sensor are respectively connected to the counter electrode and the working electrode of the electrochemical workstation, and the sensing layer is pasted on the human wrist. Then, press the index finger, middle finger, and ring finger on the three-finger electrodes respectively, apply a voltage of 0.5V to the sensor, and test the time-current curve of the sensor.

The flexible pulse sensor of the present invention is a piezoresistive sensor. When the sensing layer is subjected to constant pressure, a stable current will be generated; The resistance value changes, which in turn causes the current-time curve to change. The human body pulse signal is detected according to the frequency, peak intensity, phase and the phase difference of the three-finger electrode of the current-curve, thereby indirectly reflecting the human body pulse rate.

Compared with the prior art, the beneficial effects of the present utility model are:

(1) The flexible pulse sensor of the present utility model collects the pulse signal at the radial artery of the human wrist by setting three-finger electrodes to simulate three pulse-taking positions of Cun, Guan, and Chi in the pulse diagnosis of traditional Chinese medicine, and analyzes the pulse signal at the radial artery. Judging human physiological health improves the objectivity of TCM pulse diagnosis; by simultaneously taking pulses from three parts of the radial artery, cun, guan, and chi, the detection sensitivity of human pulse signals is greatly improved.

(2) The utility model applies the conductive cloth technology to the flexible pressure sensor technology, which makes the flexible pressure sensor simple in structure, light in texture, not easy to fall off, small in size, low in production cost, simple in operation, and stable and reliable in detection results.

(3) In this utility model, the flexible conductive substrate and the three-fingered electrode are respectively used as the counter electrode, the working electrode and the electrochemical workstation to be connected. The three-finger electrode can quickly and accurately locate the pulse-taking point, and realize the rapid detection of the human pulse signal by testing the current-time curve of the flexible sensor, which has the advantages of fast and accurate detection.

(4) The flexible pulse sensor of the present invention can not only be used for rapid detection of human pulse signals, and provide guidance information for the diagnosis, treatment and prevention of human acute diseases, but also can be applied to flexible wearable devices to realize real-time monitoring of human vital signs.

(5) The flexible conductive substrate, flexible conductive layer and flexible insulating layer of the present invention have good ductility, anti-friction, corrosion resistance and weather resistance, and the cost is low, easy to popularize, and has a high market application prospect.

Description of drawings

FIG. 1 is a schematic structural diagram of the flexible pulse sensor of the present invention.

FIG. 2 is a schematic diagram of the explosion of FIG. 1 .

FIG. 3 is a cross-sectional view of FIG. 1 .

Figure 4 shows the results of the current-time curve measured in the three-finger electrode corresponding to the electrode at the place where the pulse is taken from Zhongcun in traditional Chinese medicine.

FIG. 5 is the result of the current-time curve measured by the electrode in the three-finger electrode corresponding to the Zhongguan meridian in traditional Chinese medicine.

Figure 6 shows the results of the current-time curve measured in the three-finger electrode corresponding to the electrode at the pulse-taking position of the Chinese medicine middle ruler.

In the figure: 1, flexible conductive substrate; 101, first electrode; 2, flexible sensitive layer; 201, flexible conductive layer; 202, flexible insulating layer; 203, hole; 204, second electrode; 3, sensing layer.

Detailed ways

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings used in the description of the specific embodiments or the prior art. Obviously, the following descriptions The accompanying drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative work.

The present utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

Example

As shown in Figures 1-3, a flexible pulse sensor includes a flexible conductive substrate 1, a flexible sensitive layer 2 and a sensing layer 3 stacked in sequence from bottom to top. For the three-fingered electrodes for taking pulses, the three-fingered electrodes correspond to the three positions of taking pulses in Chinese medicine: cun, guan, and chi respectively.

Specifically, the flexible sensitive layer 2 is divided into an upper layer and a lower layer. The upper layer is a flexible conductive layer 201 and the lower layer is a flexible insulating layer 202. The upper layer and the lower layer are bonded together; the insulating layer is attached to the flexible conductive substrate. 1, the sensing layer 3 is covered and attached to the upper part of the flexible conductive layer 201.

Specifically, the flexible sensitive layer 2 is provided with a number of holes 203, the holes 203 are located on the contact surface of the three-finger electrode and the flexible conductive substrate 1, and the sensing layer 3 is sensitive to the flexible Several holes 203 arranged on the layer 2 conduct the flexible conductive substrate 1 with the flexible sensitive layer 2 .

During use, when the index finger, middle finger and ring finger of a person act on the three-finger electrodes by pressing the flexible base electrodes, the sensing layer 3 is in close contact with the conductive layer of the flexible sensitive layer 2, and at the same time the sensing layer 3 It is closely attached to the flexible substrate through a number of holes 203. At this time, the sensing layer 3 acts as a wire to conduct the flexible substrate and the flexible sensitive layer 2; the sensing layer 3 is pressed by fingers and pulsed. Deformation will occur under the force, and at the same time, its impedance will change, so that the human pulse signal can be obtained by measuring the current-time curve of the sensor.

Specifically, a plurality of the holes 203 have the same shape and are arranged at equal distances, and the diameters of the plurality of the holes 203 are 0.1 mm˜30 mm, and the thicknesses are 0.05˜10 mm.

Further, several of the holes 203 are through holes. In the non-working state, several of the holes 203 make the flexible conductive substrate 1 and the flexible sensitive layer 2 in a non-conductive state; when used for pulse testing , by pressing the sensing layer 3 , a plurality of holes 203 arranged on the flexible sensing layer 2 will serve as wires to make the flexible conductive substrate 1 and the flexible sensing layer 2 conduct.

Specifically, the edges of the flexible conductive substrate 1 and the three-finger electrodes extend outward to form the first electrode 101 and the second electrode 204, respectively.

During the pulse test, the first electrode 101 is used as the counter electrode, and the three second electrodes 204 are used as working electrodes to connect to the electrochemical workstation to scan the current-time curve. The human body pulse can be calculated from the frequency of the current-time curve. frequency, and infer the strength of the human pulse through the intensity of the current peak.

Specifically, the flexible conductive substrate 1 and the three-finger electrodes are in the shape of stepwise increasing width. On the one hand, it is convenient to connect to the electrochemical workstation during testing, and at the same time, it can save cloth and avoid the connection between the flexible conductive substrate 1 and the three-finger electrode in a non-working state, thereby reducing the service life of the flexible pulse sensor.

Specifically, the flexible conductive substrate 1 and the flexible conductive layer 201 are fiber cloth coated with nano-silver wires.

Specifically, the sensing layer 3 is one of conductive fiber cloth, conductive rubber or conductive sponge; preferably, conductive fiber cloth.

Specifically, the flexible insulating layer 202 is a polymer film composed of at least one component of polyvinyl alcohol, polyester, nylon, acrylate, epoxy and polyurethane.

The thickness of the flexible conductive substrate 1, the flexible conductive layer 201, and the flexible insulating layer 202 is 0.05-10 mm.

Specifically, the area of the flexible pulse sensor is 6-8 square centimeters, and the shape of the flexible sensor is a square, a circle or an ellipse.

The pulse testing method of a flexible pulse sensor includes the following steps: connecting the first electrode 101 and the second electrode 204 of the pulse sensor to the counter electrode and the working electrode of the electrochemical workstation, respectively, and connecting the sensing layer to the counter electrode and the working electrode. 3 Put it on the wrist of the human body, and then press the flexible conductive substrate 1 with the index finger, middle finger, and ring finger to act on the positions of the three-finger electrode's cun, close, and chi to take the pulse, and apply a voltage of 0.5V to the sensor to test the time of the sensor. - Current curve.

Figures 4 to 6 are the results of the current-time curves measured at the three-finger electrodes Cun, Guan, and Chi to take the pulse. It can be seen from the figure that a pulse cycle is 0.8-0.9s, that is, the pulse frequency is 67-75 times /min, indicating that the tester's pulse is at a normal level.

At the same time, the level of the current peak in the current-time curve represents the strength of the tester's pulse peak, indicating the pumping function of the heart. If the pulse is weakened and the current amplitude is low, it means that the tester's heart rate is small, the pulse pressure is small, or the peripheral resistance is increased. At this point, the subject may be in a weak pulse or a state of shock.

It can be observed from the results in Figures 4 to 6 that three prominent parts appear on the curve of each pulse cycle, which correspond to the ascending branch (percussion wave), the crest (tidal wave) and the descending branch (heavy wave) of the normal pulse wave, respectively. Pulse) three parts. The strength of the three pulse waves indicates the strength of the tester's heart pumping. For example, the ascending branch occurs in the early stage of left ventricular systole and is caused by the ejection of blood from the left ventricle to the aortic wall; the wave crest, also known as the tidal wave, appears in the middle and late systole, when the blood runs to the distal end of the artery, part of it reverses and impinges on the artery. The descending branch occurs when the blood is folded back from the periphery to the proximal end and then forwards during the diastole of the ventricle, and the elastic recoil of the aortic wall causes the blood flow to continue to flow to the peripheral arteries.

At the same time, by analyzing the results in Figures 4 and 6, it can be seen that the phase differences in the current-time curves of the three-finger electrodes Cun, Guan, and Chi for taking the pulse are basically the same, and the phase difference is small, indicating that the tester has a good blood flow in the body. . Blood fluency is related to the prediction of human cardiovascular emergencies, and the smaller the phase difference, the smoother the blood flow and the better the cardiovascular function.

The above are only illustrative examples of the present invention, and are not intended to limit the present invention in any form and substance. It should be pointed out that for those of ordinary skill in the art, without departing from the method of the present invention, Some improvements and supplements made should also be regarded as the protection scope of the present utility model; all those skilled in the art, without departing from the spirit and scope of the present utility model, utilize the technical content disclosed above to make some The equivalent changes of modification, modification and evolution are all equivalent embodiments of the present invention; at the same time, any modification, modification and evolution of any equivalent changes made to the above-mentioned embodiments according to the essential technology of the present invention are still within the scope of the present invention. The scope of protection of the utility model.

Claims (11)

1. The utility model provides a flexible pulse sensor, its characterized in that includes flexible electrically conductive basement (1), flexible sensitive layer (2) and the sensing layer (3) of stacking in proper order from bottom to top, flexible sensitive layer (2) include the interval set up side by side be used for getting the three finger electrode of arteries and veins, three finger electrode is corresponding to in traditional chinese medical science cun, close, the three position of getting the arteries and veins of chi respectively.

2. The flexible pulse sensor according to claim 1, wherein the flexible sensitive layer (2) is divided into an upper layer and a lower layer, the upper layer is a flexible conductive layer (201), the lower layer is a flexible insulating layer (202), and the upper layer and the lower layer are bonded together; the insulating layer is attached to the flexible conductive substrate (1), and the sensing layer (3) is attached to the upper portion of the flexible conductive layer (201) in a covering mode.

3. The flexible pulse sensor according to claim 2, wherein the flexible sensing layer (2) is provided with a plurality of holes (203), the holes (203) are located on the contact surface of the three-finger electrode and the flexible conductive substrate (1), and the sensing layer (3) conducts the flexible conductive substrate (1) and the flexible sensing layer (2) through the plurality of holes (203) arranged on the flexible sensing layer (2).

4. A flexible pulse sensor according to claim 3, characterized in that several of said holes (203) are shaped identically and equidistantly.

5. The flexible pulse sensor of claim 4, wherein the plurality of holes (203) have a diameter of 0.1mm to 30 mm.

6. The flexible pulse sensor according to claim 1, wherein the edges of the flexible conductive substrate (1) and the three-finger electrodes extend outwards to form a first electrode (101) and a second electrode (204), respectively.

7. The flexible pulse sensor according to claim 6, wherein the flexible conductive substrate (1) and the three-finger electrode are in a shape with a width gradually increased in a stepwise manner.

8. The flexible pulse sensor according to claim 1 or 2, wherein the flexible conductive substrate (1) and the flexible conductive layer (201) are fiber cloth plated with nano silver wires.

9. A flexible pulse sensor according to claim 1 or 2, characterized in that the sensing layer (3) is one of a conductive fiber cloth, a conductive rubber or a conductive sponge.

10. The flexible pulse sensor of claim 2 wherein the flexible insulating layer (202) is a polymer film of at least one of polyvinyl alcohol, polyester, nylon, acrylate, epoxy, and polyurethane.

11. The flexible pulse sensor of claim 1 wherein the area of the flexible pulse sensor is 6-8 square centimeters and the flexible pulse sensor is square, circular or elliptical in shape.

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