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WO2019237281A1 - Capteur ppg, montre ou bracelet intelligent(e) - Google Patents

Capteur ppg, montre ou bracelet intelligent(e) Download PDF

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Publication number
WO2019237281A1
WO2019237281A1 PCT/CN2018/091071 CN2018091071W WO2019237281A1 WO 2019237281 A1 WO2019237281 A1 WO 2019237281A1 CN 2018091071 W CN2018091071 W CN 2018091071W WO 2019237281 A1 WO2019237281 A1 WO 2019237281A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
distance
ppg sensor
heart rate
ppg
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/091071
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English (en)
Chinese (zh)
Inventor
席毅
孙士友
贺彦国
杨荣广
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2018/091071 priority Critical patent/WO2019237281A1/fr
Priority to CN201880047076.6A priority patent/CN110913757B/zh
Publication of WO2019237281A1 publication Critical patent/WO2019237281A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/024—Measuring pulse rate or heart rate
    • A61B5/0245—Measuring pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals

Definitions

  • the present application relates to the field of wearable devices, and in particular, to a PPG (Photoplethysmograph) sensor and a smart watch or bracelet including the PPG sensor.
  • PPG Photoplethysmograph
  • PPG uses photoelectric plethysmography to detect human physiological parameters and is used in biomedicine.
  • PPG sensors include PD (photodiode, photodiode) and LED (Light Emitting Diode, light emitting diode), which include two types of transmission and reflection.
  • PPG sensors applied to wearable devices are usually reflective.
  • the working principle of the reflective PPG sensor is as follows: After the light emitted by the LED is reflected by the human blood and tissue, the PD receives the light reflected from the human blood and tissue, and detects the difference in the intensity of the reflected light absorbed by the human blood and tissue. To trace human physiological parameters.
  • PPG PPG technology has become a standard feature of smart watches or bracelets.
  • PPG has the following applications on smart watches or bracelets: static heart rate measurement, dynamic heart rate measurement, wearing tightness detection, and blood oxygen measurement.
  • the above four different applications have different requirements for the layout of PD and LED.
  • the static heart rate measurement requires a small distance between PD and LED
  • the tightness detection and blood oxygen measurement require a large distance between PD and LED
  • the dynamic heart rate measurement requires that the distance between the PD and the LED be both large and small.
  • the first aspect of the present application provides a PPG sensor, so that the layout of the PD and LED can take into account the multiple application requirements of PPG on a smart watch or bracelet.
  • the second aspect of the present application provides a smart watch or bracelet including the PPG sensor.
  • a first aspect of the present application provides a PPG sensor, including: a first PD, a first LED, and a second LED, wherein a distance between the first PD and the first LED and the first PD The distance from the second LED is not equal.
  • a distance between two PDs and LEDs of different sizes can be formed.
  • the distance between the two different PDs and LEDs can meet the requirements for the distance between PDs and LEDs in different application scenarios. For example, you can measure the static heart rate by measuring the reflected light intensity between a PD and an LED with a small distance, and you can wear a smart watch or bracelet by measuring the reflected light intensity between a PD and an LED with a large distance. Tightness detection and blood oxygen measurement can be used to measure the dynamic heart rate by measuring the reflected light intensity between the two different sizes of PD and LED. Therefore, the layout of the PD and the LED in the PPG sensor provided in the embodiment of the present application can meet the four application requirements of static heart rate measurement, dynamic heart rate measurement, wearing tightness detection, and blood oxygen measurement.
  • the first PD, the first LED, and the second LED are located on a straight line.
  • the first PD, the first LED, and the second LED are not on a straight line.
  • the PPG sensor further includes a second PD, and the second PD and the first PD are distributed between The first PD, the second PD, and the first LED have the same distance on both sides of the straight line where the first LED and the second LED are located, and the first PD and the second PD The distance to the second LED is equal.
  • a third possible implementation manner can improve the accuracy of PPG in measuring human physiological parameters and the tightness of the device.
  • the layouts of the first PD, the first LED, the second LED, and the second PD are rectangular And the first PD, the first LED, the second LED, and the second PD are distributed on vertices of a rectangle.
  • the PPG sensor further includes a third LED and a second PD,
  • the third LED is located on an extension line connecting the second LED and the first LED, and a distance between the first PD and the second LED is equal to the first PD and the third LED the distance between;
  • the second PD is located at a position where the first PD is symmetrical with respect to a connection line between the first LED and the second LED.
  • the fifth possible implementation manner can further improve the accuracy of the PPG in measuring the physiological parameters of the human body and the tightness of the device.
  • the layouts of the first PD, the second LED, the third LED, and the second PD are parallel A quadrangle, and the first PD, the second LED, the first LED, and the second PD are distributed on vertices of a parallelogram.
  • the parallelogram is a square or a rhombus.
  • the first LED and the second LED can emit green light, red light, and infrared light At least one kind of light.
  • the third LED can emit at least one of green light, red light, and infrared light Kind of light.
  • a second aspect of the present application provides a smart watch or bracelet, which includes a body and a wearing belt, wherein a PPG sensor is provided in the body, and the PPG sensor is the PPG sensor according to any one of claims 1-10. .
  • the effect of the smart watch or bracelet provided in the second aspect of the application corresponds to the PPG sensor provided in the first aspect described above.
  • the PPG sensor provided in this application includes a first PD, a first LED, and a second LED, wherein a distance between the first PD and the first LED and a distance between the first PD and the second LED The distance varies.
  • the distance between two PDs and LEDs of different sizes can be formed.
  • the distance between the two different PDs and LEDs can meet the requirements for the distance between PDs and LEDs in different application scenarios. For example, you can measure the static heart rate by measuring the reflected light intensity between a PD and an LED with a small distance, and you can wear a smart watch or bracelet by measuring the reflected light intensity between a PD and an LED with a large distance.
  • Tightness detection and blood oxygen measurement can be used to measure the dynamic heart rate by measuring the reflected light intensity between the two different sizes of PD and LED. Therefore, the layout of the PD and the LED in the PPG sensor provided in the embodiment of the present application can meet the four application requirements of static heart rate measurement, dynamic heart rate measurement, wearing tightness detection, and blood oxygen measurement.
  • FIG. 1 is a schematic diagram of a PD and LED layout structure in a PPG sensor in the prior art
  • FIG. 2 is a schematic diagram of a PD and LED layout structure in another PPG sensor in the prior art
  • FIG. 3 is a schematic diagram of a tightness detection principle provided by an embodiment of the present application.
  • FIGS. 4 to 7 are schematic diagrams of a PD and LED layout structure in a PPG sensor according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a layout structure of PDs and LEDs in another PPG sensor according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of a layout structure of PDs and LEDs in another PPG sensor according to an embodiment of the present application.
  • the PPG sensor includes one PD 11 and three LEDs 12-14. Among them, PD 11 is located in the middle, and LEDs 12-14 are placed on three sides of the PD. The distance between the three LEDs 12-14 and PD 11 is equal.
  • the PPG sensor can only measure static heart rate and dynamic heart rate when tightly worn. If you measure the dynamic heart rate when wearing loose, the accuracy of the dynamic heart rate will be seriously reduced.
  • the PPG sensor includes a three-in-one LED 21 in the middle and three PDs 22-24 on the three sides of the LED 21.
  • the distances between the three PDs 22-24 and the LED 21 are equal.
  • the cost of PD is usually more than twice the cost of LEDs. Therefore, the use of 3 PDs in this PPG sensor will lead to a higher cost of the whole machine, and the PPG sensor is used for blood oxygen measurement and dynamic heart rate measurement when loosely worn. Are less accurate.
  • the three-in-one LED 21 is an LED device capable of emitting green, red, and infrared light.
  • a PPG sensor In order to make the PPG sensor compatible with the four application requirements of static heart rate, dynamic heart rate (tight fit, loose fit), tight fit detection, and blood oxygen detection, a PPG sensor is provided in this application.
  • the PPG sensor can be compatible with four application requirements: static heart rate, dynamic heart rate (in the tightly worn state and in the loosely worn state), wearing tightness detection, and blood oxygen detection.
  • the PPG system uses the light reflected from human tissue received by the PD to detect functions such as blood oxygen or heart rate. Most of the reflected light is direct current (DC), and a small part is an alternating current (AC) signal due to pulse pulses.
  • DC direct current
  • AC alternating current
  • the composition of the DC signal is complex, with both external ambient light and reflected light from the skin and tissues.
  • AC signals are the key signals used to detect blood oxygen or heart rate. Therefore, how to obtain a larger AC signal and increase the ratio of the AC signal to the DC signal is an important factor in system design.
  • Motion noise in dynamic heart rate is very high. Using a single optical path, it is difficult to eliminate motion noise. Multiple signals are needed for blind source analysis. Therefore, in order to achieve dynamic heart rate measurement, the distance between PD and LED is required to be close.
  • the PPG sensor includes a first PD, a first LED, and a second LED.
  • the distance between the first PD and the first LED and the first PD and the second LED The distance varies.
  • the distance between two PDs and LEDs of different sizes can be formed.
  • the distance between the two different PDs and LEDs can meet the requirements for the distance between PDs and LEDs in different application scenarios.
  • the layout of the PD and the LED in the PPG sensor provided in the embodiment of the present application can meet the four application requirements of static heart rate measurement, dynamic heart rate measurement, wearing tightness detection, and blood oxygen measurement.
  • the outline of the PPG sensor is described using a circle as an example.
  • the outline of the PPG sensor can also be other shapes such as ellipse, strip, and the like.
  • a PPG sensor provided by an embodiment of the present application includes a first PD 41, a first LED 42 and a second LED 43.
  • the distance d1 between the first PD 41 and the first LED 42 and the first LED 42 The distance d2 between one PD 41 and the second LED 43 is not equal. As an example, d1 ⁇ d2.
  • the first PD 41, the first LED 42 and the second LED 43 are arranged laterally and are located on a straight line.
  • the first PD 41, the first LED 42 and the second LED 43 may also be arranged vertically and located on a straight line.
  • the first PD 41, the first LED 42 and the second LED 43 may not be located on the same straight line.
  • the layout of the first PD 41, the first LED 42 and the second LED 43 has a triangular distribution.
  • the layout of the three may be a right-angled triangle, where The first PD 41 is located on the right-angle vertex, and the lengths of the two right-angle sides are not equal.
  • the first LED 42 and the second LED 43 may be LED devices capable of emitting at least one of green light (G), red light (R), and infrared light (IR).
  • the first LED 42 and the second LED 43 may be a green light (G) LED device, a green light and infrared light two-in-one LED device, and red light. Any one of a two-in-one LED device, green light, and red light (a three-in-one LED device that is infrared light).
  • a path between the first PD 41 and the first LED 42 with a short distance can be used to measure the static heart rate.
  • the first PD 41, the second LED 42 and the second LED 43 are used for dynamic heart rate measurement.
  • the first LED 42 and the second LED 43 are three-in-one (G, R, and IR) LED devices, three short-distance light paths can be formed between the first PD 41 and the first LED 42.
  • the first PD Three long-distance light paths can be formed between 41 and the second LED 43. Using these 6 light paths can effectively remove motion noise and achieve accurate measurement of dynamic heart rate.
  • the first PD 41 and the second LED 43 with a long distance are used to achieve tightness detection and blood oxygen detection.
  • the distance between two PDs and LEDs of different sizes can be formed.
  • the distance between the two different PDs and LEDs can meet the requirements for the distance between PDs and LEDs in different application scenarios.
  • the static heart rate can be detected by measuring the reflected light intensity between the first PD 41 and the first LED 42 with a small distance, and the distance between the first PD 41 and the second LED 42 with a large distance can be measured.
  • the reflected light intensity realizes the tightness detection and blood oxygen measurement of the smart watch or bracelet.
  • the layout of the PD and the LED in the PPG sensor provided in the embodiment of the present application can meet the four application requirements of static heart rate measurement, dynamic heart rate measurement, wearing tightness detection, and blood oxygen measurement.
  • the embodiment of the present application also provides another implementation manner of the PPG sensor. It should be noted that another implementation manner of the PPG sensor is improved based on the PPG sensor shown in FIG. 7.
  • another implementation manner of the PPG sensor provided in the embodiment of the present application may include a first PD 41, a first LED 42 and a second LED 43, and may further include a second PD 81,
  • the second PD 81 and the first PD 41 are distributed on both sides of the straight line where the first LED 42 and the second LED 43 are located, and the distances between the first PD 41, the second PD 81, and the first LED 42 are equal.
  • a distance d1 the distances between the first PD 41, the second PD 81, and the second LED 42 are equal, and is set to a second distance d2, where d1 ⁇ d2.
  • the layout of the PDs and LEDs in the PPG sensor can also be understood as: the distributions of the first PD 41, the first LED 42 and the second LED 43, and the second PD 81 in the PPG are parallelograms.
  • the first PD 41, the first LED 42 and the second LED 43 and the second PD 81 are distributed on the vertices of the parallelogram.
  • the layouts of the first PD 41, the first LED 42, the second LED 43 and the second PD 81 are rectangular, wherein the first PD 41, the first LED 42, the second LED 43 and the second PD PD 81 is located on the vertex of the rectangle, and the LED and PD are located on non-adjacent vertices.
  • two PDs are provided.
  • the LED is a three-in-one LED device
  • a short-distance path between the six PDs and the LEDs can be formed (ie, the first PD 41 and the first LED 42).
  • 3 paths between the second PD and 81 and the second LED 43) and 6 long-distance paths between the PD and the LED that is, between the first PD 41 and the second LED 43 3 paths, and 3 paths between the second PD 81 and the first LED 42).
  • the three paths between the first PD 41 and the first LED 42 and the three paths between the second PD 81 and the second LED 43 can be used to measure the static heart rate to achieve the effect of controlling power consumption.
  • the measurement of the physiological parameters of a person and the tightness of the wearing of the device by using multiple light intensities can reduce the error of the detection result and improve the accuracy of the detection result.
  • the above is another specific implementation manner of the PPG sensor provided in the embodiment of the present application.
  • the static heart rate, dynamic heart rate, tightness of equipment wearing, and blood oxygen can be detected more accurately.
  • the PPG sensor provided in the embodiment of the present application may further include a second PD 91 and a third LED 92.
  • the third LED 92 is located on an extension line connecting the second LED 43 and the first LED 42, and the distance between the first PD 41 and the second LED 43 is equal to the distance between the first PD 41 and the third LED 92
  • the second PD 91 is located at a position where the first PD 41 is symmetrical with respect to the connection between the first LED 42 and the second LED 43.
  • the distance between the second PD 91 and the first LED 42 is equal to the distance between the first PD 41 and the first LED 42
  • the distance between the second PD 91 and the second LED 43 is the same as the first PD 41 and the second
  • the distance between LED 43, the second PD 91 and the third LED 92 are equal to the first PD 41 and the third LED 92
  • the distance between the first PD 41 and the second LED 43 and the third LED 92 equal.
  • the layouts of the first PD 41, the second LED 43, the second PD 91, and the third LED 92 may be parallelograms with equal sides and sides, and the first LED 42 is located in the parallelogram. center.
  • the parallelogram may be a rhombus.
  • the parallelogram may be a square.
  • the third LED 92 can emit at least one of green light, red light, and infrared light.
  • the third LED 92 can be a three-in-one LED device, that is, an LED device capable of emitting green, red, and infrared light.
  • the third LED 92 may be an LED device that emits green light.
  • the first LED 42, the second LED 43, and the third LED 92 may be green and red.
  • the distance between the first PD 41 and the first LED 42 is equal to the distance between the second PD 91 and the first LED 42, and the distance is the first distance d1.
  • the distances between the first PD 41 and the second PD 91 are equal to the distance between the second LED 43 and the third LED 92, respectively.
  • the distance is set to the second distance d2.
  • the first distance d1 is smaller than the second distance. d2.
  • the first PD 41, the second PD 71, and the second LED 43 with the smallest distance between the PD and the LED can be used to measure the static heart rate.
  • the path between each LED and the PD can be fully used to measure the dynamic heart rate.
  • the first LED 42, the second LED 43, and the third LED 92 can all be three-in-one LED devices of green, red, and infrared light
  • 18 light paths can be formed in the PPG sensor, of which 12 There are 6 long-distance paths and 6 short-distance paths. Using these 18 light paths can effectively reduce motion noise and improve the accuracy of dynamic heart rate when loosely worn. It should be noted that in the method for specifically detecting the dynamic heart rate, the PPG will set different weights on the reflected light intensities on the 18 light paths, and then use the weighted average method to calculate the dynamic heart rate.
  • the 12 long-distance paths are as follows:
  • Second LED 43 (G / RED / IR) —Second PD 91, 3 long-distance paths;
  • the green, red, and infrared light paths of each LED are used.
  • the six short-distance paths are as follows:
  • First LED 42 (G / RED / IR) —First PD 41, 3 short-distance paths;
  • the green, red, and infrared light paths of each LED are utilized.
  • the signal difference between the above 12 long-distance paths can be used to detect the device wearing tightness detection.
  • the following eight long-distance pathways can be used for blood oxygen test.
  • Second LED 43 (RED / IR) —First PD 41, 2 long-distance paths;
  • Second LED 43 (RED / IR) —Second PD 91, 2 long-distance paths;
  • Third LED 92 (RED / IR) —the first PD 41, 2 long-distance paths;
  • the red and infrared light paths of each LED are used.
  • the above is another specific implementation manner of the PPG sensor provided in the embodiment of the present application.
  • the static heart rate, dynamic heart rate, tightness of equipment wearing, and blood oxygen can be detected more accurately.
  • this specific implementation can control PPG power consumption and support 24-hour continuous heart rate testing.
  • the embodiment of the present application also provides a smart bracelet or watch.
  • the smart bracelet or watch includes a body and a wearing belt, and a PPG sensor is arranged in the body.
  • the PPG sensor is the PPG sensor described in any one of the above specific implementation manners.

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Abstract

La présente invention concerne un capteur PPG. Le PPG comprend un premier PD, une première DEL et une seconde DEL, la distance entre le premier PD et la première DEL n'étant pas égale à la distance entre le premier PD et la seconde DEL. Ainsi, dans le capteur PPG, deux distances de tailles différentes entre le PD et les DEL peuvent être formées. Les deux distances différentes entre le PD et les DEL peuvent satisfaire aux exigences pour les distances entre le PD et les DEL dans différents scénarios d'application, en particulier, le capteur de PPG peut satisfaire à quatre exigences d'application : la mesure de fréquence cardiaque statique, la mesure de fréquence cardiaque dynamique, la détection d'étanchéité à l'usure et la mesure d'oxygène sanguin. Sur cette base, l'invention concerne en outre une montre ou une bracelet intelligent(e) comprenant le capteur PPG.
PCT/CN2018/091071 2018-06-13 2018-06-13 Capteur ppg, montre ou bracelet intelligent(e) Ceased WO2019237281A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2018/091071 WO2019237281A1 (fr) 2018-06-13 2018-06-13 Capteur ppg, montre ou bracelet intelligent(e)
CN201880047076.6A CN110913757B (zh) 2018-06-13 2018-06-13 一种ppg传感器、智能手表或手环

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/091071 WO2019237281A1 (fr) 2018-06-13 2018-06-13 Capteur ppg, montre ou bracelet intelligent(e)

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WO2019237281A1 true WO2019237281A1 (fr) 2019-12-19

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CN113069079A (zh) * 2021-03-18 2021-07-06 安徽华米信息科技有限公司 电子设备及生物信息测量方法
CN113180651A (zh) * 2021-04-23 2021-07-30 安徽华米信息科技有限公司 生理参数检测机构及可穿戴设备
CN113827185A (zh) * 2020-06-23 2021-12-24 华为技术有限公司 穿戴设备佩戴松紧程度的检测方法、装置及穿戴设备
WO2022078043A1 (fr) * 2020-10-15 2022-04-21 Oppo广东移动通信有限公司 Capteur ppg, dispositif électronique et dispositif vestimentaire
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CN116584912A (zh) * 2022-12-30 2023-08-15 北京津发科技股份有限公司 一种多光源心率检测装置、方法和可穿戴设备
WO2025003445A1 (fr) * 2023-06-30 2025-01-02 Ectosense NV Procédé et appareil de détection d'étanchéité de capteur
CN119488273A (zh) * 2023-08-14 2025-02-21 Oppo广东移动通信有限公司 可穿戴设备及检测设备
US20250281129A1 (en) * 2022-04-18 2025-09-11 Google Llc Wearable Computing Device Having Optical Sensors to Indirectly Determine a Location of a Force Applied to a User Interface

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CN115251857A (zh) * 2021-04-30 2022-11-01 北京荣耀终端有限公司 一种基于光电体积描记ppg的可穿戴设备及其控制方法
CN114305331B (zh) * 2021-12-01 2024-03-19 安徽华米信息科技有限公司 一种采集生理参数的方法、装置及设备
CN120392054A (zh) * 2022-06-21 2025-08-01 荣耀终端股份有限公司 Ppg模组、ppg信号的测量方法及电子设备
CN120282750A (zh) * 2023-11-07 2025-07-08 华为技术有限公司 一种检测装置、电子设备

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN113827185A (zh) * 2020-06-23 2021-12-24 华为技术有限公司 穿戴设备佩戴松紧程度的检测方法、装置及穿戴设备
WO2022078043A1 (fr) * 2020-10-15 2022-04-21 Oppo广东移动通信有限公司 Capteur ppg, dispositif électronique et dispositif vestimentaire
EP4218553A4 (fr) * 2020-10-15 2024-03-27 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Capteur ppg, dispositif électronique et dispositif vestimentaire
CN113069079A (zh) * 2021-03-18 2021-07-06 安徽华米信息科技有限公司 电子设备及生物信息测量方法
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CN116584912A (zh) * 2022-12-30 2023-08-15 北京津发科技股份有限公司 一种多光源心率检测装置、方法和可穿戴设备
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CN119488273A (zh) * 2023-08-14 2025-02-21 Oppo广东移动通信有限公司 可穿戴设备及检测设备

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