Intelligent cap lining and system for vital sign monitoring

Abstract

According to the intelligent helmet lining and system for vital sign monitoring, the detection sensor is arranged at the artery blood vessel position below the forehead of the human head of the helmet lining, and the sensor detects parameters such as blood oxygen and heart rate according to different light reflection characteristics corresponding to the oxygen content of blood; therefore, wearable heart rate, blood oxygen and body temperature detection is achieved, personalized customization can be achieved for the wearer according to the physiological characteristics of the wearer, and vital sign data of different people can be collected more accurately. The intelligent cap lining can be used in various large engineering projects, outdoor operation and other scenes, health data can be collected in real time and uploaded to a cloud platform, real-time evaluation and early warning are carried out on the health state of an operator through cloud big data, and the intelligent cap lining has important significance on project management and safety production.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent helmet liners, and provides an intelligent helmet liner and a system for vital sign monitoring. Background Art

[0002] Currently, in various large-scale engineering projects, outdoor operations and other scenarios, workers usually use safety helmets to protect their safety. The existing safety helmets only rely on the external materials of the helmets to achieve physical safety protection and cannot obtain relevant information of the workers. In addition, since the helmet liners of the existing safety helmets are not intelligent wearable devices, they cannot implement the function of data collection, nor can they collect data such as the heart rate, blood oxygen, and body temperature of the wearers, and cannot obtain the physiological conditions of the wearers in real time, resulting in the inability to timely obtain the vital signs of the wearers and the inability to achieve personalized customization for the wearers. Summary of the Invention

[0003] To solve the problems of the existing technology, the present invention provides an intelligent helmet liner and a system for realizing vital sign monitoring, which can collect data such as the heart rate, blood oxygen, and body temperature of the wearer, and can perform real-time evaluation and early warning on the health status of the wearer through cloud big data, and can achieve personalized customization for the wearer.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides an intelligent helmet liner for vital sign monitoring. The intelligent helmet liner includes a control box, a temperature sensor, and a forehead heart rate and blood oxygen detection device. The control box includes a control board, a sensor interface, a battery, a switch, a GPS antenna, a status indicator light, a USB interface, a WIFI module, and a Bluetooth module. The intelligent helmet liner collects the heart rate, blood oxygen, and body temperature data of the wearer through the temperature sensor and the forehead heart rate and blood oxygen detection device, and uploads the collected data to a cloud server through the WIFI module and receives the data fed back by the cloud server. The forehead heart rate and blood oxygen detection device includes a plurality of heart rate and blood oxygen detection sensors. By placing the heart rate and blood oxygen detection sensors at the position of the artery under the forehead of the human head of the safety helmet liner, the corresponding parameters are detected according to the light reflection characteristics corresponding to the oxygen content in the blood. Among them, the heart rate and blood oxygen sensor realizes the detection of heart rate and blood oxygen according to the Lambert-Beer law spectrophotometry. When a monochromatic light of a predetermined wavelength irradiates a solution of a predetermined concentration, its absorbance is proportional to the thickness of the liquid layer through which it passes. During the measurement, the reflection value is amplified, filtered, and the wave peaks and wave valleys are identified, so as to perform heart rate detection and blood oxygen detection. Among them, heart rate detection is to detect the pulse, and blood oxygen detection is to detect the blood oxygen saturation SpO2.

[0006] Further, the sensor SpO2 measurement method used in the intelligent cap lining of the present invention is reflective pulse oximetry detection. In this reflective pulse oximetry detection, a photodiode and an LED are placed on the same side, and the photodiode collects the light reflected from different depths under the skin; SpO2 is a measurement method of surface capillary oxygen saturation and is an estimation of the oxygen content in capillary blood, which is obtained by calculating the percentage of oxyhemoglobin in total hemoglobin.

[0007] Further, the specific method for the intelligent cap lining of the present invention to detect the pulse is as follows: The pulsatile arterial blood absorbs and modulates the incident light passing through the tissue and forms a photoplethysmogram (PPG) signal. The AC component of the PPG signal represents the light absorbed by the pulsatile arterial blood, and this AC component is superimposed on the DC signal that captures the light absorption effects of other blood and tissue components. The DC and AC components of the received PPG signal are different for different LED wavelengths, and the heart rate per minute can be calculated through filtering and peak-valley identification.

[0008] Further, the temperature sensor set of the present invention realizes temperature detection and infrared data calibration by integrating a silicon temperature sensor in the infrared receiving area of the sensor. The temperature accuracy is 0.0625 °C, and the temperature detection range is from -40 °C to 85 °C.

[0009] Further, the heart rate and blood oxygen detection sensor of the present invention is MAX30102, which integrates a heart rate algorithm, supports continuous detection, and can adjust the sampling time and sampling current.

[0010] Further, the intelligent cap lining of the present invention can achieve personalized customization according to the physiological characteristics of the wearer, specifically: for personnel with different weights and skin colors, the number of heart rate and blood oxygen detection sensors is adaptively adjusted.

[0011] Further, the present invention detects the integrity of the head skin of the wearer, and when there are tattoos or scalp injuries on the head of the wearer, the position of the sensor is adjusted.

[0012] Further, in order to measure SpO2, the present invention requires two LEDs with different wavelengths; these two wavelengths meet the condition of being able to separate the molar absorption coefficients of HbO2 and RHb.

[0013] Further, according to the distribution of arteries and veins in the human head, the acquisition point positions set by the present invention are: the parts on the forehead of the head where the blood vessels are regular, the skin is uniform, and the blood vessels are clear.

[0014] Furthermore, the present invention provides a system for vital sign monitoring, characterized by comprising the above-mentioned intelligent cap liner and a cloud server. The intelligent cap liner collects the health data of the operator in real time and uploads it to the cloud server. After receiving the data, the cloud server conducts real-time evaluation and early warning of the operator's health status.

[0015] Compared with the prior art, for the intelligent cap liner provided by the present invention, by arranging the detection sensors at the position of the artery under the forehead of the human head inside the safety cap liner, the sensors detect parameters such as blood oxygen and heart rate according to the different light reflection characteristics corresponding to the oxygen content in the blood. At the same time, ultra-low-power sensors and embedded processors are adopted, so as to realize wearable heart rate, blood oxygen and body temperature detection. Moreover, it can be customized for the wearer according to the physiological characteristics of the wearer, thereby improving the accuracy and precision of the collected data, providing an accurate data basis for the subsequent data processing of the cloud server, and facilitating more accurate analysis of the physical condition of the personnel. The intelligent cap liner of the present invention can be used in various large-scale engineering projects, outdoor operations and other scenarios, can collect health data in real time and upload it to the cloud platform, and conduct real-time evaluation and early warning of the health status of the operator through cloud big data, which is of great significance for project management and work safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic diagram of the intelligent cap liner;

[0018] Figure 2 is a schematic diagram of the control box of the intelligent cap liner; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following makes an explanation of the exemplary embodiments of the present application in conjunction with the drawings. Various details of the embodiments of the present application are included to help understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described here without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted below.

[0020] The present invention provides an intelligent cap lining for vital sign monitoring. The intelligent cap lining includes a control box, a temperature sensor, and a forehead-type heart rate and blood oxygen detection device. The control box includes a control board, a sensor interface, a battery, a switch, a GPS antenna, a status indicator light, a USB interface, a WIFI module, and a Bluetooth module. The intelligent cap lining collects the heart rate, blood oxygen, and body temperature data of the wearer through the temperature sensor and the forehead-type heart rate and blood oxygen detection device, and uploads the collected data to a cloud server through the WIFI module. The schematic diagram of the intelligent cap lining is as shown in Figure 1 shown, and the control box of the intelligent cap lining is as shown in Figure 2 shown.

[0021] The intelligent cap lining of the present invention can be used in various scenarios such as large-scale engineering projects and outdoor operations. It can collect health data in real time and upload it to the cloud server, and the cloud server can conduct real-time evaluation and early warning of the health status of the operators, which is of great significance for project management and work safety.

[0022] The main principle of the heart rate and blood oxygen sensor of the intelligent cap lining of the present invention is based on (the Lambert-Beer law, the basic law of spectrophotometry), that is, when a monochromatic light of an appropriate wavelength irradiates a solution with a fixed concentration, its absorbance is proportional to the thickness of the liquid layer through which it passes. The intelligent cap lining sensor uses the reflection method to measure, and at the same time amplifies, filters the reflection value, and identifies the peaks and valleys to detect the blood oxygen saturation spo2 and pulse.

[0023] The Lambert-Beer law is the basic law of spectrophotometry, which describes the relationship between the absorption strength of a substance to a certain wavelength of light and the concentration of the light-absorbing substance and the thickness of its liquid layer. Spectrophotometry is a technique that uses the unique absorption spectrum of a substance to identify the substance or determine its content. This technique is sensitive, accurate, fast, and simple, and is widely used in biochemical research.

[0024] The basic principle of spectrophotometry is to utilize the Lambert-Beer law, that is, when a beam of parallel monochromatic light perpendicularly passes through a certain homogeneous and non-scattering light-absorbing substance, its absorbance (A) is proportional to the concentration (C) of the light-absorbing substance and the thickness (L) of the absorption layer. It is expressed by the formula: A = εCL, where A is the absorbance, ε is the molar absorptivity, C is the concentration of the light-absorbing substance, and L is the thickness of the light-absorbing solution.

[0025] Light waves refer to electromagnetic waves with wavelengths between 0.3 and 3 μm. Color is related to wavelength and frequency, and is divided into visible light and invisible light (Table 1-1). Visible light refers to electromagnetic waves that can cause vision, with wavelengths between 400-700 nm. Among them, violet light has the highest frequency and the shortest wavelength, while red light is exactly the opposite. Invisible light mainly includes infrared rays, ultraviolet rays, and X-rays. An object that emits light is called a light source, and light sources are divided into natural light and artificial light. According to the principle of light emission, they are divided into radiation luminescence, electron luminescence, chemiluminescence, bioluminescence, etc.

[0026] Applications of Spectrophotometry

[0027] Determination of the Concentration of the Sample to be Measured for Quantitative Analysis In actual work, since the thickness of the cuvette containing the solution is the same, the concentration of the substance to be measured can be determined by the following methods:

[0028] (1) Standard Comparative Method: Under the same conditions, prepare a standard solution and a sample solution to be measured, and measure their absorbances. By comparing the absorbances of the two, the concentration of the sample solution to be measured can be obtained.

[0029] (2) Standard Curve Method: Prepare a series of standard solutions with increasing concentrations from low to high, and measure their absorbances. Take the concentrations of the standard solutions as the abscissa and the corresponding absorbances as the ordinate, and plot a standard curve on a grid coordinate paper. After measuring the absorbance of the sample to be measured under the same conditions, its concentration can be directly obtained from the standard curve. This method is usually applicable to the analysis of a large number of samples.

[0030] (3) Standard Coefficient Method: After measuring the absorbance of the standard solution multiple times, calculate the standard coefficient according to the following formula.

[0031] Standard Coefficient = Concentration of Standard Solution / Average Absorbance of Standard Solution The standard coefficient can also be obtained from the standard curve. Then, measure the absorbance of the solution to be measured in the same way and substitute it into the formula to calculate the concentration of the substance to be measured.

[0032] Errors of Spectrophotometry

[0033] 1. Solution Concentration If the concentration of the solution of the substance to be measured is too high or too low, it will deviate from Lambert-Beer's law, affecting the accuracy of detection. Generally, when the absorbance of the solution concentration of the substance to be measured is between 0.1 and 0.8, it most conforms to the light absorption law. At this time, the detection linearity is good and the reading error is small. If the absorbance is not within this range, the colorimetric solution can be appropriately diluted or concentrated before measurement.

[0034] 2. Interfering substances: Certain substances can interfere with the color reaction process of the analyte to be measured, or they themselves have light absorption characteristics similar to or the same as those of the analyte to be measured. When these substances are present in the solution to be measured, the measured value of the solution will not conform to the actual concentration of the analyte to be measured, thus resulting in errors.

[0035] 3. Reflected light and scattered light: When the refractive indices of light of the solution to be measured and the reference solution are different, it will cause different emission losses. When the solution to be measured is turbid, scattering effects will occur when incident light passes through. These non-absorption effects will all produce measurement errors.

[0036] 4. Instrument noise: The noise of a spectrophotometer is mainly generated by the light source intensity, electronic devices, and photoelectric tubes. Excessive instrument noise can seriously affect the sensitivity and accuracy of the measurement.

[0037] 5. Cuvette: Mismatch of cuvettes, non-parallel light-transmitting surfaces, inaccurate positioning, etc. will all cause differences in their light transmittance and lead to errors in the measurement results.

[0038] SpO2 is a measurement method for surface capillary oxygen saturation. SpO2 is an estimate of the oxygen content in capillary blood, that is, the percentage of oxyhemoglobin in total hemoglobin; hemoglobin (Hb) is the oxygen-carrying protein in red blood cells. The two main forms of Hb present in blood are oxyhemoglobin (oxyhemoglobin, HbO2) and deoxyhemoglobin (deoxyhemoglobin, RHb).

[0039] Non-invasive blood oxygen detection can be achieved by the Lambert-Beer law photoelectric method. To measure SpO2, two LEDs with different wavelengths are required. These two wavelengths should be selected to be sufficiently separated in the molar absorption coefficients of HbO2 and RHb. In pulse oximetry, a red LED at 660 nm and an infrared LED at 880 nm are usually used.

[0040] In reflective pulse oximetry, the photodiode and the LED are placed on the same side. The photodiode collects the light reflected from different depths under the skin. The SpO2 measurement solution adopted by the intelligent cap lining in this application belongs to reflective pulse oximetry. The calculation formula for SpO2 is as follows:

[0041]

[0042] Pulsatile arterial blood absorbs and modulates the incident light passing through the tissue and forms a photoplethysmogram (PPG) signal. The AC component of the PPG signal represents the light absorbed by the pulsatile arterial blood. This AC component is superimposed on the DC signal that captures the light absorption effects of other blood and tissue components (such as venous and capillary blood, bone, water, etc.). The ratio of the AC signal to the DC level is called the perfusion index (PI).

[0043] The DC and AC components of the received PPG signal are different for different LED wavelengths. This is because the absorption characteristics of HbO2, RHb, and other tissue components for different wavelengths are different. By filtering and identifying peaks and valleys, the heart rate per minute can be calculated.

[0044] According to the distribution of arteries and veins in the human head, the set acquisition point location is: the part of the head forehead where the blood vessels are regular, the skin is uniform, and the blood vessels are clear.

[0045] The temperature sensor set realizes temperature detection and infrared data calibration through an integrated silicon temperature sensor in the infrared receiving area of the sensor. The temperature accuracy is 0.0625 °C, and the temperature detection range is -40 °C to 85 °C.

[0046] The heart rate and blood oxygen detection sensor is a max30102 medical-grade sensor, integrated with a heart rate algorithm, supporting continuous detection. For blood oxygen acquisition: it uses an 18-bit ADC, continuous detection, adjustable sampling time and sampling current, and has the function of a low-power heart rate monitor (<1mW).

[0047] Since in the actual use process, the physiological parameters such as the weight and skin color of the wearing person are different. In order to obtain accurate data, personalized customization can be implemented for the wearing person to more accurately collect the vital sign data of different people. The intelligent cap lining can achieve personalized customization according to the physiological characteristics of the wearing person, specifically: for people with different weights and different skin colors, adaptively adjust the number of heart rate and blood oxygen detection sensors.

[0048] For people with different weights and different skin colors, an adaptive algorithm is used to adjust the number of heart rate and blood oxygen detection sensors.

[0049] There are three preset weight levels. The first weight level T1 is thin, the second weight level T2 is moderate, and the third weight level T3 is overweight; the specific weight range corresponding to the weight level can be set and adjusted according to the actual situation and is not limited here.

[0050] There are three preset skin color levels. The first skin color level F1 is white or light color, the second skin color level F2 is yellow, and the third skin color level F3 is black or brown; the specific skin color can be determined according to the existing general skin color classification table and is not limited here.

[0051] The adjustment of the number of heart rate and blood oxygen detection sensors for people of different weights and different skin colors specifically includes:

[0052] S1. Judge the weight level of the wearing person;

[0053] S2. When the weight level of the wearing person is T1, further judge the skin color level of the wearing person;

[0054] S21 When the skin color level of the wearer is F1 or F2, set the number of heart rate and blood oxygen detection sensors to N1;

[0055] S22 When the skin color level of the wearer is F3, set the number of heart rate and blood oxygen detection sensors to N2;

[0056] S3. When the weight level of the wearer is T2, further determine the skin color level of the wearer;

[0057] S31. When the skin color level of the wearer is F1, set the number of heart rate and blood oxygen detection sensors to N3;

[0058] S32. When the skin color level of the wearer is F2 or F3, the number of heart rate and blood oxygen detection sensors is N4;

[0059] S4. When the weight level of the wearer is T3, do not judge the skin color, and the number of heart rate and blood oxygen detection sensors is N5;

[0060] Wherein, N1 < N2 < N3 < N4 < N5.

[0061] Through the above adaptive algorithm, the physiological characteristics of the wearer can be detected, so as to adaptively adjust the number of heart rate and blood oxygen detection sensors, so as to realize intelligent personalized customization, and can more accurately obtain the vital sign data of different people, so as to improve the accuracy and precision of the collected data, and provide an accurate data basis for the data processing of the subsequent cloud server.

[0062] In addition, in order to prevent the head of the wearer from being unable to accurately obtain the corresponding data due to other factors, the head skin of the wearer is also detected. By detecting the integrity of the head skin of the wearer, when there is a tattoo or scalp injury (scar or wound) on the head of the wearer, the position of the sensor is adjusted to avoid installing the sensor on the tattoo or the damaged area.

[0063] In order to realize the real-time evaluation and warning of the health status of the wearer, the present invention also provides a system for vital sign monitoring, the system includes an intelligent cap lining and a cloud server, the intelligent cap lining collects the health data of the wearer in real time and uploads it to the cloud server, and after receiving the data, the cloud server conducts real-time evaluation and warning on the health status of the wearer.

[0064] Through the cloud server, the data of the wearer collected by the intelligent cap lining can be obtained in time, and the collected data can be analyzed and evaluated to timely find out whether the vital signs of the operator are normal, and the analysis result is fed back to the intelligent cap lining to remind the operator whether to rest and adjust or seek medical treatment in time.

[0065] The intelligent cap liner and system for vital sign monitoring provided by the present invention place detection sensors at the position of the artery under the forehead of the human head in the safety cap liner. The sensors detect parameters such as blood oxygen and heart rate according to the different light reflection characteristics corresponding to the oxygen content in the blood. At the same time, ultra-low-power sensors and embedded processors are adopted, so as to realize wearable heart rate, blood oxygen and body temperature detection, and can also customize for the wearer according to the physiological characteristics of the wearer, and more accurately collect the vital sign data of different people.

[0066] The intelligent cap liner of the present invention can be used in various scenarios such as large-scale engineering projects and outdoor operations, and can collect health data in real time and upload it to the cloud platform. Through cloud big data, the health status of the operators can be evaluated and warned in real time, which is of great significance to project management and work safety.

[0067] The above specific implementation manners do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An intelligent cap liner for vital sign monitoring, characterized in that, The intelligent helmet liner includes a control box, a temperature sensor, and a forehead heart rate and blood oxygen detection device. The control box includes a control board, a sensor interface, a battery, a switch, a GPS antenna, a status indicator light, a USB interface, a WIFI module, and a Bluetooth module. The intelligent helmet liner collects the heart rate, blood oxygen, and body temperature data of the wearer through the temperature sensor and the forehead heart rate and blood oxygen detection device, uploads the collected data to the cloud server through the WIFI module, and receives the data feedback from the cloud server. The forehead heart rate and blood oxygen detection device includes multiple heart rate and blood oxygen detection sensors. By placing the heart rate and blood oxygen detection sensors at the position of the arterial blood vessels under the forehead of the human head of the safety helmet liner, the corresponding parameters are detected according to the light reflection characteristics corresponding to the oxygen content in the blood. Among them, the heart rate and blood oxygen sensor realizes the detection of heart rate and blood oxygen based on the Lambert-Beer law spectrophotometry. When a monochromatic light of a predetermined wavelength irradiates a solution of a predetermined concentration, its absorbance is proportional to the thickness of the liquid layer through which it passes. During the measurement, the reflection value is amplified, filtered, and the wave peaks and valleys are identified, so as to perform heart rate detection and blood oxygen detection. Among them, heart rate detection is to detect the pulse, and blood oxygen detection is to detect the blood oxygen saturation SpO2.

2. The intelligent cap liner according to claim 1, characterized in that The sensor SpO2 measurement method adopted by the intelligent helmet liner is reflective pulse oximetry. The reflective pulse oximetry places the photodiode and the LED on the same side, and the photodiode collects the light reflected from different depths under the skin. SpO2 is a measurement method of the oxygen saturation of surface capillaries and is an estimate of the oxygen content in capillary blood, which is obtained by calculating the percentage of oxyhemoglobin in total hemoglobin.

3. The intelligent cap liner according to claim 1, characterized in that, The specific method for the intelligent helmet liner to detect the pulse is as follows: The pulsating arterial blood absorbs and modulates the incident light passing through the tissue and forms a photoplethysmogram (PPG) signal. The alternating current component of the PPG signal represents the light absorbed by the pulsating arterial blood. The alternating current component is superimposed on the direct current signal that captures the light absorption effect of other blood tissue components. The direct current and alternating current components of the received PPG signal are different for different LED wavelengths. By filtering and identifying the wave peaks and valleys, the heart rate per minute is calculated.

4. The intelligent cap liner according to claim 1, characterized in that, The temperature sensor set realizes temperature detection and infrared data calibration through an integrated silicon temperature sensor in the infrared receiving area of the sensor. The temperature accuracy is 0.0625 °C, and the temperature detection range is from -40 °C to 85 °C.

5. The intelligent cap liner according to claim 1, characterized in that, The heart rate and blood oxygen detection sensor is MAX30102, which integrates a heart rate algorithm, supports continuous detection, and can adjust the sampling time and sampling current.

6. The intelligent cap lining according to claim 1, wherein The intelligent helmet liner can achieve personalized customization according to the physiological characteristics of the wearer. Specifically, for personnel with different weights and skin colors, the number of heart rate and blood oxygen detection sensors is adaptively adjusted.

7. The intelligent cap lining according to claim 1, characterized in that, By detecting the integrity of the head skin of the wearer, when the wearer has a tattoo or scalp injury on the head, the position of the sensor is adjusted.

8. The intelligent cap lining according to claim 1, wherein, To measure SpO2, two LEDs with different wavelengths are required; these two wavelengths meet the condition of being able to separate the molar absorption coefficients of HbO2 and RHb.

9. The intelligent cap lining according to claim 1, characterized in that, According to the distribution of arteries and veins in the human head, the collection point positions are set as follows: the parts of the forehead blood vessels of the head are regular, with uniform skin and clear blood vessels.

10. A system for vital sign monitoring, characterized in that, It includes the intelligent cap lining and the cloud server as described in any one of claims 1-9. The intelligent cap lining collects the health data of the wearer in real time and uploads it to the cloud server. After receiving the data, the cloud server conducts real-time evaluation and early warning on the health status of the wearer.

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