CN111265200A - Wearable physiological signal detection device and detection method - Google Patents

Abstract

The invention discloses a wearable physiological signal detection device and a detection method, wherein the physiological signal detection device comprises a base body, at least four light emitters and at least four light receivers, wherein the light emitters are used for providing irradiation light for skin at the positions to irradiate soft tissues in the skin, the light receivers are used for receiving characteristic light wave signals reflected by the soft tissues, the characteristic light wave signals provide basic data for physiological signal generation, the four light receivers are arranged on four different directions to receive the characteristic light wave signals reflected by the soft tissues from different angles, a retaining wall is arranged between each light emitter and each light receiver adjacent to the light emitter, and the retaining wall is used for preventing light rays emitted by the light emitters from being directly received by the light receivers; the wearable physiological signal detection device can obtain a physiological signal with stable signal and good quality no matter in a static state or in a motion process, and effectively meets the requirements of motion enthusiasts on physiological signal monitoring.

Description

Wearable physiological signal detection device and detection method

technical field

The invention relates to the technical field of smart wearable devices, and in particular, to a wearable physiological signal detection device and a detection method.

Background technique

With the advent of the wave of intelligence, smart wearable devices have ushered in a period of rapid development. While wearable categories such as smart bracelets, smart watches, and smart rings are emerging one after another, the functions of the products themselves are also constantly improving. For example, more and more The products are equipped with physiological signal monitoring, blood oxygen detection or blood pressure detection functions as standard. Physiological signals such as blood oxygen and blood pressure vary from person to person based on age, gender and other physiological conditions. Specifically, the factors that affect the changes of physiological signals are mainly three regulatory systems, namely autoregulation, humoral regulation, and neural regulation. Changes in physiological signals can directly or indirectly reflect the health status of many aspects of the human body, which is the significance of measuring physiological signals. In the field of smart wearables, in terms of exercise, the significance of measuring physiological signals is mainly as follows: physiological signals can reflect the real information of the user's body when exercising. If the physiological signal is too high and the exercise is too intense, the user's body water evaporates too quickly This kind of exercise is not good for the body. If the physiological signal of only light exercise is not high enough, the user will not be able to burn enough calories. Physiological signal monitoring includes transmission photoelectric method and reflective photoelectric method (also known as physiological signal detection method). The physiological signal detection equipment currently used in smart wearable devices is generally based on reflective photoelectric method. The existing physiological signal detection method The device is generally equipped with a light transmitter and a light receiver. However, although the reflected photoelectric method performs well in a stable state, when the device is worn on the end of the wrist, it will behave like a pendulum as the user walks or moves erratically. Generally oscillating up and down, it is easy to cause the light wave signal reflected by the soft tissue received by the optical receiver to be poor or lose the signal, so that the quality of the formed physiological signal is poor, which cannot meet the stable and accurate monitoring of the physiological signal in the state of exercise.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a wearable physiological signal detection device that can provide good physiological signals no matter in static state or during exercise.

Another object of the present invention is to provide a wearable physiological signal detection method that can provide good physiological signals no matter in static state or during exercise.

In order to achieve the above object, the present invention discloses a wearable physiological signal detection device, which includes a base body, a light transmitter and a light receiver, and the base body is used to fix the light transmitter and the light receiver on the body In a certain part, there are at least four light receivers, the light transmitters are used for providing irradiation light to the skin at the location, so as to illuminate the soft tissue in the skin, the light receivers are used for receiving characteristic light wave signals reflected by the soft tissue, The characteristic light wave signal provides basic data for the generation of physiological signals, the four light receivers are arranged in four different directions to receive the characteristic light wave signal reflected by the soft tissue from different angles, the light transmitter and its phase A blocking wall is arranged between each of the adjacent optical receivers, and the blocking wall is used to block the light emitted by the optical transmitter from being directly received by the optical receiver

Compared with the prior art, the wearable physiological signal detection device of the present invention is equipped with at least four light receivers on the base to receive the characteristic light wave signals reflected by the soft tissue from the detected part in all directions. How the substrate oscillates can ensure that at least one optical receiver receives a characteristic light wave signal with better quality, and a good physiological signal can be obtained according to the better characteristic light wave signal; it can be seen that sampling the above-mentioned wearable physiological signal detection The device, whether in static state or during exercise, can obtain physiological signals with stable signals and good quality, effectively meeting the needs of sports enthusiasts for physiological signal monitoring; A blocking wall is arranged between each light receiver, which can effectively avoid the signal interference of the light transmitter to the light receiver and improve the accuracy of the physiological signal.

Preferably, the wearable physiological signal detection device further includes a processing device electrically connected to the light receiver, and the processing device is configured to generate a physiological signal according to the characteristic light wave signal.

Preferably, there is one light transmitter, and four light receivers are located around the light transmitter.

Preferably, the number of the optical transmitters is four, and each of the four optical transmitters is located at the position of the included angular space formed by the two optical receivers, so that the four optical transmitters are The skin is irradiated from different angles.

Preferably, the height of the retaining wall is 0.4-0.8 mm.

Preferably, the effective distance between the light emitter and the retaining wall is 1-1.5 mm.

Preferably, a transparent cover plate covering the light emitter and the light receiver is further provided on the base.

Preferably, the thickness of the transparent cover plate is about 0.55mm, the distance between the transparent cover plate and the light generator is about 0.25mm, and the distance between the transparent cover plate and the light receiver is about 0.25mm. The spacing is about 0.4mm.

Preferably, the base body is a smart bracelet or a smart watch.

Preferably, the processing device and the optical receiver are connected by wire or wirelessly.

Preferably, the physiological signal includes one or more of PPG signal, blood oxygen signal, and blood pressure signal.

The invention also discloses a wearable physiological signal detection method, which comprises:

A signal collection device is worn on a certain part of the body in a wearable manner, the signal collection device includes a light transmitter and a light receiver, the light receivers are at least four, and the detected part is irradiated by the light transmitter. For the skin, the four light receivers respectively receive the characteristic light wave signals reflected by the soft tissue in the skin in different directions in the detection area, and the optimal one among the plurality of the characteristic light wave signals fed back by the four light receivers is used as the basis The data generates a physiological signal; a blocking wall is arranged between the light transmitter and each of the adjacent light receivers, and the blocking wall is used to block the light emitted by the light transmitter from being directly transmitted by the light receiver. Receiver receives.

Preferably, there is one light transmitter, and four of the light receivers are located around the light transmitter.

Preferably, there are four light transmitters, and each of the four light transmitters is located at the position of the included angular space formed by the two light receivers, so that the four light transmitters are The skin is irradiated from different angles.

Preferably, the physiological signal includes one or more of PPG signal, blood oxygen signal, and blood pressure signal.

Description of drawings

FIG. 1 is a schematic plan view of a wearable physiological signal detection device according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of a wearable physiological signal detection device according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view along the direction A-A in FIG. 2 .

Detailed ways

In order to describe the technical content, structural features, achieved objects and effects of the present invention in detail, the following detailed description is given in conjunction with the embodiments and the accompanying drawings.

The invention discloses a wearable physiological signal detection device for real-time detection of human heart rate, blood oxygen (SPO2) or blood pressure. The physiological signal detection device in this embodiment is based on a reflection photoelectric method. The soft tissue reflection is processed to obtain the desired physiological signal. This method is very simple to measure, and the requirements for the measurement site are also very low. As long as the tissue is relatively smooth and the subcutaneous fat is less, it can be measured almost everywhere, such as the forehead and wrist. Wait. Specifically, as shown in FIGS. 1 and 2 , the physiological signal detection device includes a signal acquisition device and a processing device (not shown), wherein the signal acquisition device includes a substrate 1 , an optical transmitter 10 and an optical receiver 11 . The base 1 is used to fix the light transmitter 10 and the light receiver 11 on a certain part of the body (such as the wrist), there are at least four light receivers 11, and the light transmitter 10 is used to provide irradiation light to the skin at the location to illuminate The soft tissue in the skin, the light receiver 11 is used to receive the characteristic light wave signal reflected by the soft tissue. The characteristic light wave signal reflects the pulsatile changes of soft tissue, and provides basic data for the processing device to generate physiological signals. The processing device generates physiological signals based on at least a part of the characteristic light wave signals. The processing device can use the physiological signals to calculate the user's heart rate, blood oxygen saturation Physiological parameters such as temperature and blood pressure. The four light receivers 11 are arranged in four different directions to receive characteristic light wave signals reflected by the soft tissue from different angles. A blocking wall 12 is disposed between the optical transmitter 10 and each adjacent optical receiver 11 , and the blocking wall 12 is used to block the light emitted by the optical transmitter 10 from being directly received by the optical receiver 11 . The base body 1 in this embodiment is a smart watch, but it is not limited thereto, for example, it can also be a smart wearable device such as a wristband, a headband worn on the forehead, and the like. The light transmitter 10 in this embodiment is an LED light source, and the LED light source can be a green light, a red light or an infrared light, and the light receiver 11 is a photodiode.

The signal acquisition process of the above-mentioned physiological signal detection device is as follows: the smart watch equipped with the signal acquisition device of the above-mentioned structure is worn on the wrist, and the light transmitter 10 is irradiated on the skin of the wrist where it is located, and received through four light receivers. The receivers 11 respectively receive the characteristic light wave signals reflected by the soft tissue in the skin in different directions in the detection area, and the processing device uses the optimal one among the plurality of characteristic light wave signals fed back by the four light receivers 11 as the basic data to generate the physiological signal. Therefore, no matter how the substrate 1 oscillates, at least one optical receiver 11 can be guaranteed to receive a characteristic light wave signal with better quality, and the processing device can obtain a good physiological signal according to the better characteristic light wave signal. Through the above signal acquisition device, physiological signals with stable signals and good quality can be obtained whether in static state or during exercise, which effectively meets the needs of sports enthusiasts for monitoring physiological signals. In addition, a blocking wall 12 is provided between the optical transmitter 10 and each adjacent optical receiver 11. The blocking wall 12 is used to block the light emitted by the optical transmitter 10 from being directly received by the optical receiver 11, which can effectively prevent the light from being directly received by the optical receiver 11. The optical transmitter 10 interferes with the signal of the optical receiver 11 to improve the accuracy of the physiological signal.

Further, as shown in FIG. 1 , there is one light transmitter 10 , and four light receivers 11 are located around the light transmitter 10 . In this embodiment, under the condition of low power consumption, a good optical detection effect can be achieved, and the four optical receivers 11 can allow the user to effectively detect the polarization of the substrate 1 regardless of whether it is the up, down, left, and right polarizations of the substrate 1 in motion. to the optical signal.

Further, as shown in FIG. 2 , there are four light transmitters 10 , and each of the four light transmitters 10 is located at the position of the angle space formed by the two light receivers 11 , so that the four light The transmitter 10 illuminates the skin from different angles. In this embodiment, a blocking wall 12 is disposed between each optical transmitter 10 and two adjacent optical receivers 11 , and each optical transmitter 10 is simultaneously two adjacent optical receivers 11 . The emitting light source is provided, so that each optical receiver 11 can receive the reflected signals of at least two optical transmitters 10 at the same time, so as to feed back better detection signals to the processing device, thereby obtaining good physiological signals.

Preferably, as shown in FIG. 3 , in order to make the blocking wall 12 have better shading effect, the height H1 of the blocking wall 12 in the above embodiment is 0.4-0.8 mm, preferably 0.6 mm, as shown in FIG. 1 and FIG. 2 , The effective distance D1 between the light emitter 10 and the blocking wall 12 is 1˜1.5 mm.

Furthermore, as shown in FIG. 3 , the base body 1 is further provided with a transparent cover plate 13 covering the light transmitter 10 and the light receiver 11 to protect the signal acquisition device. Preferably, the thickness D2 of the transparent cover 13 is about 0.55mm, the distance D3 between the transparent cover 13 and the light emitter 10 is about 0.25mm, and the distance D4 between the transparent cover 13 and the light receiver 11 is About 0.4mm.

In addition, the processing device includes an analog-to-digital conversion module and a processor, which can be integrated on the base body 1 together with the signal acquisition device. The processing device can also be independent of the signal acquisition device. In this case, the processing device can be electrically connected to the optical receiver 11 through wireless signals. The processing device can be an independent single device or other handheld smart device.

The above disclosures are only the preferred embodiments of the present invention, which of course cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention.

Claims (15)

1. A wearable physiological signal detection device is characterized by comprising a substrate, a light emitter and a light receiver, the basal body is used for fixing the light emitter and the light receiver on a certain part of a body, the number of the light receivers is at least four, the light emitter is used for providing irradiation light to skin at the position, to illuminate soft tissue in the skin, the light receiver for receiving characteristic light wave signals reflected by the soft tissue, the characteristic light wave signal provides basic data for physiological signal generation, four light receivers are arranged at four different orientations, receiving the characteristic light wave signals reflected by soft tissues from different angles, wherein a retaining wall is arranged between the light emitter and each light receiver adjacent to the light emitter, the retaining wall is used for blocking the light emitted by the light emitter to be directly received by the light receiver.

2. The wearable physiological signal detection device of claim 1, further comprising a processing device electrically connected to the optical receiver, the processing device configured to generate a physiological signal based on the characteristic lightwave signal.

3. The wearable physiological signal detection device of claim 1, wherein there is one light emitter and four light receivers are located around the light emitter.

4. The wearable physiological signal detection device of claim 1, wherein the number of the light emitters is four, and each of the four light emitters is located at a position in an included angle space formed by the two light receivers, so that the four light emitters irradiate the skin from different angles.

5. The wearable physiological signal detection device of claim 1, wherein the height of the retaining wall is 0.4-0.8 mm.

6. The wearable physiological signal detecting device according to claim 1, wherein the effective distance between the light emitter and the retaining wall is 1-1.5 mm.

7. The wearable physiological signal detecting device according to claim 1, wherein a transparent cover plate covering the light emitter and the light receiver is further disposed on the base.

8. The wearable physiological signal detection device according to claim 7, wherein the transparent cover plate has a thickness of about 0.55mm, the distance between the transparent cover plate and the light generator is about 0.25mm, and the distance between the transparent cover plate and the light receiver is about 0.4 mm.

9. The wearable physiological signal detection device of claim 1, wherein the substrate is a smart bracelet or a smart watch.

10. The wearable physiological signal detection device of claim 2, wherein the processing device and the optical receiver are connected via a wired or wireless connection.

11. The wearable physiological signal detection device of claim 2, wherein the physiological signal comprises one or more of a PPG signal, a blood oxygen signal, a blood pressure signal.

12. A wearable physiological signal detection method, comprising:

wearing a signal acquisition device on a certain part of a body in a wearable manner, wherein the signal acquisition device comprises at least four light emitters and at least four light receivers, the light emitters irradiate the skin of the detected part, the four light receivers respectively receive characteristic light wave signals reflected by soft tissues in the skin in different directions in a detection area, and the optimal one of the characteristic light wave signals fed back by the four light receivers is used as basic data to generate physiological signals; the light emitter and each adjacent to the light emitter are provided with retaining walls between the light receivers, and the retaining walls are used for blocking light rays emitted by the light emitter to be directly received by the light receivers.

13. The wearable physiological signal detection method of claim 12 wherein there is one optical emitter and four optical receivers are located around the optical emitter.

14. The wearable physiological signal detection method of claim 12 wherein there are four phototransmitters, and each of the four phototransmitters is located at a position in an angular space formed by the two photoreceivers, so that the four phototransmitters illuminate the skin from different angles.

15. The wearable physiological signal detection method of claim 12 wherein the physiological signal comprises one or more of a PPG signal, a blood oxygen signal, and a blood pressure signal.

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