Patch type health index detection device

Abstract

The invention provides a patch type health index detection device, which relates to the technical field of medical detection equipment and comprises a light source part and a detection part. The light source part comprises a laser element used for emitting a detection light beam. The detection part is attached to a target area of a detection target and comprises a processing unit, a photoelectric detector and a first optical thin film located on the light incident side of the photoelectric detector, the first optical thin film is a light filtering thin film, and the transmission wavelength comprises the wavelength of a detection light beam. Wherein the detection light beam can be transmitted to the target area through the detection part, transmits the target area to a preset depth, and is reflected at the preset depth of the target area to form a reflected light beam, the reflected light beam is transmitted to the photoelectric detector through the first optical film, and the photoelectric detector forms a detection signal based on the reflected light beam. The processing unit obtains a health index of the detection target based on the detection signal. The detection device is low in cost, high in detection speed and high in accuracy of detection results.

Description

Technical Field

[0001] The present application relates to the technical field of medical detection devices, and particularly to a patch-type health index detection device. Background Art

[0002] With the improvement of living standards, people pay more and more attention to their own health levels, such as health indicators such as heart rate, blood oxygen, blood sugar, and blood pressure. This has led to the emergence of various detection devices for health indicators, especially wearable portable detection devices, which greatly facilitate people's monitoring of their own various health indicators and have gradually spread to people's daily lives.

[0003] However, with the gradual popularization of health index detection devices, how to improve the reliability of health index detection devices, that is, how to improve the accuracy of the obtained health indicators, has become a key issue for those skilled in the art. Summary of the Invention

[0004] In view of this, the present application provides a health index detection device, and the solution is as follows:

[0005] A patch-type health index detection device, comprising:

[0006] A light source part, the light source part includes a laser light source, and the laser light source is used to emit a detection beam, and the detection beam at least includes a first laser beam with a first wavelength;

[0007] A detection part, the detection part is used to be attached to a target area of a detection target, the detection part includes a photodetector and a first optical film located on the light incident side of the photodetector, and a processing unit; wherein, the transmission wavelength of the first optical film includes the wavelength of the detection beam;

[0008] The detection beam is transmitted through the detection part to the target area, penetrates the target area to a preset depth, and reflects at the preset depth of the target area to form a reflected beam, and the reflected beam is transmitted through the first optical film to the photodetector;

[0009] The photodetector forms a detection signal based on the reflected beam, and the processing unit obtains the health index of the detection target based on the detection signal.

[0010] Optionally, the detection part further includes a housing, the housing is a non-transparent housing, and the side of the housing facing the target area exposes the internal area of the housing, and the photodetector and the processing unit are located inside the housing;

[0011] The housing comprises a light entrance hole, which is opposite to the target area and located at a side of the housing away from the target area. The detection light beam enters the inner area of ​​the housing through the light entrance hole and is transmitted to the target area.

[0012] Optionally, the detection part further includes a circuit board, the circuit board is located in the housing, connected to the housing, and a plane where the circuit board is located is parallel to a plane where a side of the housing is located away from the target area;

[0013] The circuit board comprises a through hole, the through hole is opposite to the light entrance hole, and the detection light beam is transmitted to the target area through the light entrance hole and the through hole in sequence;

[0014] The processing unit is disposed on the circuit board and is located in a region outside the through hole in the circuit board;

[0015] The photoelectric detector is arranged on the circuit board and is located in a region outside the through hole in the circuit board.

[0016] Optionally, the light entrance hole is located in a middle area of ​​a side of the housing away from the target area;

[0017] The through hole is located in the middle area of ​​the circuit board, and along a direction perpendicular to the plane where the circuit board is located, the center of the light entrance hole and the center of the through hole are located in the same straight line;

[0018] Wherein, along a direction parallel to the plane where the circuit board is located, the width of the through hole is equal to or smaller than the width of the light incident hole.

[0019] Optionally, the photoelectric detector includes N detectors, N ≥ 2;

[0020] The N detectors are arranged in a direction surrounding the through hole, and the N detectors are arranged symmetrically relative to the through hole;

[0021] Wherein, N=2, the N detectors are respectively located on two opposite sides of the through hole, and the connecting line of the N detectors passes through the center of the through hole;

[0022] N≥3, along the direction surrounding the through hole, the angle between the i-th detector and the i+1-th detector among the N detectors and the straight line formed with the center of the through hole is a first angle, the angle between the i+1-th detector and the i+2-th detector and the straight line formed with the center of the through hole is a second angle, the first angle is equal to the second angle, 1≤i≤N-3.

[0023] Optionally, the first optical thin film includes N sub-optical thin films corresponding one-to-one to the N detectors, the N sub-optical thin films are respectively located on the light incident side of the corresponding detector, and the transmission wavelength of each sub-optical thin film corresponds to the wavelength of one of the light beams in the detection light beam;

[0024] Wherein, the bandwidth of the sub-optical thin film ranges from 10nm to 20nm, including the end values.

[0025] Optionally, N = 3; or

[0026] N = 4; or

[0027] N = 6.

[0028] Optionally, the detection part further includes an optical glass, the optical glass is located inside the housing, is connected to the housing, and the plane where the optical glass is located is parallel to the plane where the circuit board is located, and the optical glass is closer to the target area relative to the circuit board;

[0029] Along the direction perpendicular to the plane where the circuit board is located, the optical glass is not connected to the circuit board, and there is a preset distance between the optical glass and the circuit board;

[0030] Wherein, one side of the optical glass facing away from the circuit board includes a second optical thin film, and one side of the optical glass facing away from the target area further includes a third optical thin film. Along the direction perpendicular to the plane where the optical glass is located, the projections of the second optical thin film and the third optical thin film do not overlap; the transmission wavelength of the second optical thin film at least includes the wavelength of one of the light beams in the detection light beam, the transmission wavelength of the third optical thin film at least includes the wavelength of one of the light beams in the detection light beam, and the transmission wavelengths of the second optical thin film and the third optical thin film jointly include the wavelengths of all the light beams in the detection light beam.

[0031] Optionally, the transmission wavelength of the third optical thin film is the same as the transmission wavelength of the second optical thin film, or the transmission wavelength of the third optical thin film is different from the transmission wavelength of the second optical thin film.

[0032] Optionally, the detection part further includes a display unit, the display unit is located outside any side of the housing, and is used to display the health index of the detected target obtained.

[0033] Optionally, the detection light beam further includes a second laser beam with a second wavelength, and a third laser beam emitting a third wavelength;

[0034] Wherein, the value of the first wavelength is 660nm, the value of the second wavelength is 520nm, and the value of the third wavelength is 940nm.

[0035] Optionally, the light source part further includes a light homogenizing unit, a spatial light modulation unit, and a projection lens, and the laser light source is further configured to emit a fourth laser beam with a fourth wavelength, which is different from the first wavelength, the second wavelength, and the third wavelength;

[0036] The patch-type health index detection device realizes the health index detection function of the detection target based on the detection beam and the detection part; wherein, the detection beam is sequentially transmitted through the light homogenizing unit and the spatial light modulation unit, and is transmitted to the target area by the projection lens;

[0037] The patch-type health index detection device realizes a projection function based on the first laser beam, the second laser beam, and the fourth laser beam, and the light homogenizing unit, the spatial light modulation unit, and the projection lens in the light source part, so as to project and display the health index of the obtained detection target; wherein, the first laser beam, the second laser beam, and the fourth laser beam are sequentially transmitted through the light homogenizing unit, the spatial light modulation unit, and the projection lens.

[0038] Optionally, the value of the fourth wavelength is 465 nm.

[0039] Optionally, the detection part further includes a data sending unit, which is communicatively connected to the processing unit and is configured to output the health index of the obtained detection target.

[0040] Compared with the related art, the beneficial effects of the technical solution of the present application are as follows:

[0041] The detection device includes: a light source part and a detection part. The laser element in the light source part emits a detection beam, and the detection beam at least includes a first laser beam with a first wavelength. The detection part can be attached to the target area of the detection target, and includes a photodetector, a first optical film located on the light incident side of the photodetector, and a processing unit. The first optical film is a film with a light filtering function, and its transmission wavelength can include the wavelength of the detection beam. Wherein, the detection beam can be transmitted through the detection part to the target area, penetrate the target area to a preset depth, and be reflected at the preset depth of the target area to form a reflected beam. The reflected beam is transmitted to the photodetector through the first optical film, and the photodetector forms a detection signal based on the reflected beam. The processing unit obtains the health index of the detection target based on the detection signal.

[0042] As described above, the detection beam is a laser beam emitted by a laser light source. Compared with an LED light source, it effectively solves the problems of low penetration depth and low signal-to-noise ratio. Furthermore, it can effectively reduce the requirements for various components in the detection device, reduce costs, relieve the computing pressure on the processing unit 206, shorten the detection time, and improve the detection speed.

[0043] In addition, since the detection beam is a laser beam, the signal-to-noise ratio of the detection beam can be improved. Furthermore, a high signal-to-noise ratio of the PPG waveform can be ensured, and the accuracy of the obtained health indicators can be improved, that is, the accuracy of the detection device can be improved. At the same time, the detection device further includes a first optical film disposed on the light incident side of the photodetector. The first optical film can filter out beams other than the detection beam to effectively prevent beams other than the detection beam from entering the photodetector, that is, it can suppress interference beams such as ambient light from entering the photodetector, further improve the signal-to-noise ratio of the detection beam, and further ensure a high signal-to-noise ratio of the PPG waveform, improving the accuracy of the obtained health indicators, that is, improving the accuracy of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0045] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present application can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present application.

[0046] Figure 1 is a schematic structural diagram of a patch-type health index detection device provided by the present application;

[0047] Figure 2 is a schematic structural diagram of the light source part in a patch-type health index detection device provided by the present application;

[0048] Figure 3 is a schematic structural diagram of the detection part in a patch-type health index detection device provided by the present application;

[0049] Figure 4 is a schematic structural diagram of the detection part in another patch-type health index detection device provided by the present application;

[0050] Figure 5 This is a schematic structural diagram of the detection part in another patch-type health index detection device provided by the present application;

[0051] Figure 6 This is a schematic structural diagram of the detection part in another patch-type health index detection device provided by the present application;

[0052] Figure 7 This is a schematic structural diagram of the detection part in another patch-type health index detection device provided by the present application;

[0053] Figure 8 This is a schematic diagram of the transmission curve of the first optical thin film. Detailed implementation manners

[0054] Next, the embodiments in the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0055] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0056] As described in the background art section, with the gradual popularization of health index detection devices, how to improve the reliability of health index detection devices has become a key issue for those skilled in the art. The light source of traditional detection devices is an LED light source, and the LED light source has disadvantages such as a large divergence angle, low energy density, and poor penetration depth. When affected by external interference, it has a great impact on the detection results. Therefore, it can only be detected close to the skin, and light leakage caused by not being closely attached or movement will seriously affect the signal-to-noise ratio of the optical signal received by the detector, and thus affect the stability and reliability of the detected health index. Common interferences include: (1) Motion artifacts: Body movement causes changes in the contact between the sensor and the skin; (2) Ambient light: External ambient light interferes with the signal quality; (3) Skin color / fat difference: Affects the light absorption characteristics.

[0057] On this basis, in order to improve the signal-to-noise ratio and the accuracy of health indicators, higher requirements will be placed on the components used in the detection device, resulting in increased costs and also bringing greater computational pressure to the processing chip, affecting the calculation speed.

[0058] Based on the above, the present application provides a patch-type health index detection device, as Figure 1 shown Figure 1Schematic structural diagram of a patch-type health index detection device provided by this application. The detection device includes:

[0059] A light source part 100, as Figure 2 shown. The light source part 100 includes a laser light source 102. The laser light source 102 is used to emit a detection light beam, and the detection light beam at least includes a first laser light beam with a first wavelength.

[0060] A detection part 200. The detection part 200 can be attached to a target area D of a detection target. For example, the detection part 200 can be attached to the skin of a human body, that is, the detection target can be a human body, and the target area D can be a certain part of the skin of a human body. However, this application does not limit this. The above detection target can also be an animal body, and the target area D can be a certain part of the skin of the animal body. It should be noted that Figure 1 in order to more clearly show the positional relationship between the light source part 100, the detection part 200, and the target area D, the attachment of the detection part 200 to the target area D of the detection target is not shown.

[0061] As Figure 3 shown, the detection part 200 can include a photodetector 202 and a first optical thin film 204 located on the light incident side of the photodetector 202, and can also include a processing unit 206. Among them, the first optical thin film 204 is a thin film with a light filtering function, and can also be called a light filtering thin film. Its transmission wavelength can include the wavelength of the detection light beam, so that the first optical thin film 204 can filter out light beams other than the detection light beam, effectively preventing light beams other than the detection light beam from entering the photodetector 202.

[0062] Based on the above structure, the detection light beam emitted by the laser light source 102 can be transmitted to the target area through the detection part 200, penetrate the target area to a preset depth, and be reflected at the preset depth of the target area to form a reflected light beam. The reflected light beam can be transmitted to the photodetector 202 through the first optical thin film 204. Specifically, the detection light beam emitted by the laser light source 102 can be transmitted to the target area through the detection part 200, and after being transmitted to the target area, it is transmitted and refracted through the target area to the preset depth of the target area, and is reflected at the preset depth of the target area to form a reflected light beam.

[0063] The photodetector 202 forms a detection signal based on the reflected light beam, and the processing unit 206 obtains the health indicators of the detection target based on this detection signal. Specifically, after the photodetector 202 receives the reflected light beam, or rather, after the reflected light beam is transmitted to the photodetector 202, the photodetector 202 can obtain and output a PPG waveform based on the reflected light beam, and the processing unit 206 can then obtain the health indicators of the detection target based on this PPG waveform. It should be noted that the PPG waveform is the core output signal of photoplethysmography (abbreviated as PPG), and its form and characteristics directly reflect the changes in the human physiological state, and can be used to obtain health indicators such as heart rate, blood oxygen saturation, and blood pressure to achieve the detection of health indicators.

[0064] As can be seen from the above, the light source part 100 of the detection device includes a laser light source 102, so the detection light beam is a laser light beam. It is known that the laser light beam has the characteristics of high directivity and energy concentration, and then has low scattering loss and strong penetration ability, and the penetration depth can reach 5 mm to 8 mm under the skin, which is much greater than the penetration depth of the LED light beam. At the same time, the laser light beam also has high monochromaticity and high signal-to-noise ratio, so that the signal-to-noise ratio and penetration ability of the detection light beam can be greatly improved. Compared with the LED light source, the problems of low penetration depth and low signal-to-noise ratio are effectively solved, and thus the requirements for each component in the detection device can be effectively reduced, the cost can be reduced, and the computational pressure on the processing unit 206 can be alleviated, the detection time can be shortened, and the detection speed can be improved.

[0065] Also, because the laser light beam has high monochromaticity and high signal-to-noise ratio, it can also improve the signal-to-noise ratio of the detection light beam, and then ensure a high signal-to-noise ratio of the PPG waveform, so as to improve the accuracy of the obtained health indicators, that is, the accuracy of the detection device can be improved. At the same time, the detection device also includes a first optical film 204 disposed on the light incident side of the photodetector 202, and this first optical film 204 can filter out the light beams other than the detection light beam to effectively prevent the light beams other than the detection light beam from entering the photodetector 202, that is, it can suppress the interference light beams such as ambient light from entering the photodetector 202. Experiments show that on the premise that the detection light beam is a laser light beam, combined with the light filtering effect of the first optical film 204, under the interference of 105 lux white light, the signal-to-noise ratio (SNR) of the detection light beam emitted by the laser light source 102 can be increased to ≥45 dB, while the signal-to-noise ratio of the detection light beam emitted by the traditional LED light source is only 20 - 28 dB. Therefore, the laser light beam combined with the light filtering film can greatly reduce the interference of ambient light, improve the signal-to-noise ratio of the detection light beam, and then further ensure a high signal-to-noise ratio of the PPG waveform, and improve the accuracy of the obtained health indicators, that is, the accuracy of the detection device can be improved.

[0066] It should be noted that the ambient light is a continuous light beam, and the illumination intensity of any light beam within a narrow wavelength range of the ambient light is lower than the illumination intensity of the ambient light. That is to say, even if the part of the ambient light with a wavelength equal to that of the detection light beam enters the photodetector 202, due to its lower illumination intensity, that is, lower light intensity, the signal-to-noise ratio of the detection light beam is less affected, and the high signal-to-noise ratio of the PPG waveform formed by the detection light beam can still be guaranteed, thereby ensuring the accuracy of the acquired health indicators.

[0067] In addition, lasers have the advantages of fast response speed and multi-parameter expansion. Based on the fast response of lasers (modulation bandwidth>1MHz), it can support fast signal acquisition and is suitable for real-time monitoring in dynamic scenes. The delay can be controlled within 10ms. Based on multi-parameter expansion, laser spectral analysis can be used to simultaneously detect multiple physiological parameters (such as blood sugar trends, lactate levels, etc.), providing possibilities for the intelligent development of emergency equipment.

[0068] In one embodiment of the present application, Figure 3 and Figure 4 As shown, Figure 4 is a schematic diagram of the structure of the detection part 200, Figure 4 (a), (b), (c), and (d) are schematic diagrams of the structure observed from different directions, respectively. The detection part 200 also includes a shell 208, which is a non-transparent shell, and the side of the shell 208 facing the target area exposes the inner area of ​​the shell 208, that is, the side of the shell 208 facing the target area is empty, without a shell part, or at least partially empty, that is, when the detection part 200 is attached to the target area, the side of the shell 208 attached to the target area is empty, or at least partially empty. The photodetector 202 and the processing unit 206 are located in the shell 208, that is, the photodetector 202 and the processing unit 206 are arranged in the shell 208.

[0069] The housing 208 includes a light entrance hole 1, which is opposite to the target area and located on the side of the housing 208 away from the target area, that is, the light entrance hole 1 is located on the opposite side of the side that is adjacent to the target area, and usually the center of the light entrance hole 1 coincides with the center of the side where it is located. The detection light beam enters the internal area of ​​the housing 208 through the light entrance hole 1 and is transmitted to the target area. It should be noted that Figure 2 The housing 208 shown is a rectangular housing, but the present application does not limit this. The housing 208 can also be columnar, table-shaped or other irregular shapes, etc., which are not listed one by one, depending on the specific situation.

[0070] Since the housing 208 is a non-transparent housing and the housing 208 has a light incident hole 1, the detection beam is transmitted through the light incident hole 1 to the target area. That is to say, the beam can only enter the housing 208 through the light incident hole 1 on the housing 208 and is transmitted to the target area, so that the interference beam transmitted to the target area can be effectively suppressed, and further the interference beam transmitted to the photodetector 202 can be effectively suppressed to ensure the high signal-to-noise ratio of the PPG waveform and guarantee the accuracy of the obtained health indicators.

[0071] In an embodiment of the present application, as Figure 3 and Figure 4 shown, the detection part 200 further includes a circuit board 210. The circuit board 210 is located inside the housing 208 and is connected to the housing 208. Among them, the plane where the circuit board 210 is located is parallel to the plane on the side of the housing 208 facing away from the target area, that is, the plane where the circuit board 210 is located is parallel to the plane on the side where the light incident hole 1 is located in the housing 208.

[0072] The circuit board 210 includes a through hole 2. The through hole 2 is opposite to the light incident hole 1. The detection beam is sequentially transmitted through the light incident hole 1 and the through hole 2 to the target area. The processing unit 206 is disposed on the circuit board 210, and the processing unit 206 is located in the area outside the through hole 2 on the circuit board 210. The photodetector 202 is also disposed on the circuit board 210, and the photodetector 202 is located in the area outside the through hole 2 on the circuit board 210, so that the photodetector 202 and the processing unit 206 do not block the through hole 2, and thus do not block the detection beam from being transmitted to the target area, so that the detection beam transmitted through the light incident hole 1 can be transmitted through the through hole 2 to the target area.

[0073] In an embodiment of the present application, the light incident hole 1 is located in the middle area on the side of the housing 208 facing away from the target area, the through hole 2 is located in the middle area of the circuit board 210, and along the direction perpendicular to the plane where the circuit board 210 is located, the centers of the light incident hole 1 and the through hole 2 are located on the same straight line, so that the light incident hole 1 can be better aligned with the through hole 2, which helps the detection beam to be sequentially transmitted through the light incident hole 1 and the through hole 2 to the target area.

[0074] And along the direction parallel to the plane where the circuit board 210 is located, the width of the through hole 2 is equal to or less than the width of the light incident hole 1, that is, the width of the through hole 2 is not greater than the width of the light incident hole 1, so that the beam transmitted through the through hole 2 comes entirely from the detection beam as much as possible, and the beam transmitted to the target area also comes entirely from the detection beam as much as possible, and the reflected beam is also entirely formed by the reflection of the detection beam, ensuring the high signal-to-noise ratio of the PPG waveform and guaranteeing the accuracy of the obtained health indicators.

[0075] In an embodiment of the present application, as Figure 4As shown, the photodetector 202 may include N detectors, or it can be understood that the detection part 200 may include N photodetectors 202, where N≥2.

[0076] The above-mentioned N detectors are arranged in sequence along the direction of surrounding the through hole 2, and the N detectors are symmetrically arranged with respect to the through hole 2.

[0077] Among them, N = 2, and the N detectors are respectively located on opposite sides of the through hole 2, and the connection line of the N detectors passes through the center of the through hole 2, so that the N detectors are symmetrically arranged with respect to the through hole 2.

[0078] When N≥3, along the direction of surrounding the through hole 2, the included angle between the straight lines formed by the i-th detector and the (i + 1)-th detector among the N detectors and the center of the through hole 2 is located at the first included angle, and the included angle between the straight lines formed by the (i + 1)-th detector and the (i + 2)-th detector and the center of the through hole 2 is the second included angle. The first included angle is equal to the second included angle, where 1≤i≤N - 3, so that the N detectors are symmetrically arranged with respect to the through hole 2.

[0079] As can be seen from the above, the detection part 200 may include multiple photodetectors 202, and the multiple photodetectors 202 are located around the through hole 2 and are symmetrically arranged with respect to the through hole 2, so that the photodetectors 202 can be arranged in more directions around the through hole 2. Thus, even if the transmission direction of the detection beam does not strictly follow the direction perpendicular to the light incident hole 1 and the through hole 2, that is, the detection beam is slightly inclined, the reflected beam can be received by at least one of the multiple photodetectors 202. That is to say, the detection part 200 can have an inclination tolerance for the transmission direction of the detection beam, that is, the detection part 200 does not require the detection beam to strictly follow the vertical direction or a specific direction for transmission. Furthermore, the operation difficulty of using this detection device for health index detection can be reduced, and the practicability is relatively strong.

[0080] Optionally, N = 3, or N = 4, or N = 6. That is to say, the number of photodetectors 202 in the detection part 200 can be 3, 4, or 6. However, this application does not make any limitations in this regard. In other embodiments of this application, under the condition that the photodetectors 202 can be symmetrically arranged with respect to the through hole 2 and the space permits, the number of photodetectors 202 can also be other numbers, depending on the specific situation.

[0081] In one embodiment of the present application, the first optical thin film 204 includes N sub-optical thin films corresponding one-to-one to N detectors. It can also be understood that the detection part 200 includes N first optical thin films 204 corresponding one-to-one to N photodetectors 202. The above-mentioned N sub-optical thin films are respectively located on the light incident side of the corresponding detectors, and the transmission wavelength of each sub-optical thin film corresponds to the wavelength of one kind of light beam in the detection light beam, that is, one sub-optical thin film only transmits one kind of light beam, that is, one photodetector 202 only receives one kind of light beam, which can avoid different wavelength light beams in the detection light beam being received by the same photodetector 202, and further avoid the mutual crosstalk between different wavelength light beams, affecting the signal-to-noise ratio of the PPG waveform output by the photodetector 202, and ensuring a high signal-to-noise ratio of the PPG waveform.

[0082] Among them, the value range of the bandwidth of the sub-optical thin film is 10nm to 20nm, including the end values. That is to say, the passband range of the sub-optical thin film can be relatively narrow, which is a narrowband optical thin film, so that the monochromaticity of the detection light beam transmitted to the photodetector 202 through the sub-optical thin film is better and the signal-to-noise ratio is higher, which can further ensure a high signal-to-noise ratio of the PPG waveform and ensure the accuracy of the obtained health indicators.

[0083] In one embodiment of the present application, as Figure 3 shown, the detection part 200 further includes an optical glass 212. The optical glass 212 is located in the housing 208, connected to the housing 208, and the plane where the optical glass 212 is located is parallel to the plane where the circuit board 210 is located, and the optical glass 212 is closer to the target area relative to the circuit board 210. That is to say, the optical glass 212 is parallel to the circuit board 210, and along the transmission direction of the detection light beam, the optical glass 212 is closer to the target area, that is, the optical glass 212 is located on the side of the circuit board 210 facing the target area.

[0084] Along the direction perpendicular to the plane where the circuit board 210 is located, the optical glass 212 is not connected to the circuit board 210, and there is a preset distance between the optical glass 212 and the circuit board 210. Optionally, the value range of the preset distance can be 1mm to 2mm, including the end values.

[0085] Among them, as Figure 5 shown, Figure 5 is a schematic structural diagram of the detection part 200. The side of the optical glass 212 facing away from the circuit board 210 includes a second optical thin film 214, and the transmission wavelength of the second optical thin film 214 at least includes the wavelength of one kind of light beam in the detection light beam. As Figure 6 shown, Figure 6It is a schematic structural diagram of the detection part 200. On the side of the optical glass 212 facing away from the target area, there is also a third optical thin film 216. Along the direction perpendicular to the plane where the optical glass 212 is located, the projections of the second optical thin film 214 and the third optical thin film 216 do not overlap, that is, the second optical thin film 214 and the third optical thin film 216 are respectively located on both sides of the optical glass 212 and are arranged staggeredly. The transmission wavelength of the third optical thin film 216 at least includes the wavelength of one of the light beams in the detection light beam. It should be noted that the transmission wavelengths of the second optical thin film 214 and the third optical thin film 216 jointly include the wavelengths of all the light beams in the detection light beam.

[0086] Since the optical glass 212 is closer to the target area than the circuit board 210, that is, the optical glass 212 is located on the side of the circuit board 210 facing the target area, the reflected light beam can first pass through the optical glass 212 and then be transmitted to the photodetector 202 and received by the photodetector 202. Therefore, before the reflected light beam is transmitted to the photodetector 202, it can first be filtered by the second optical thin film 214 and the third optical thin film 216 on the optical glass 212 in sequence, and then be transmitted to the photodetector 202, which can further inhibit the interference light beam from being transmitted to the photodetector 202 to ensure a high signal-to-noise ratio of the PPG waveform and guarantee the accuracy of the obtained health indicators.

[0087] It should be noted that the above interference light beam can be an environmental light beam entering from the light inlet hole 1, etc., or an environmental light beam entering the housing 208 from the gap between the housing 208 and the target area, etc. That is to say, the detection device can detect the health indicators by contacting the target area of the detection target, or can also detect by a non-contact method with the detection target. That is, the detection method of the detection device can be contact type or non-contact type, with a wider application scenario and stronger practicability.

[0088] In an embodiment of the present application, the transmission wavelength of the third optical thin film 216 and the transmission wavelength of the second optical thin film 214 can be the same, that is, the transmission wavelengths of the third optical thin film 216 and the second optical thin film 214 both include the wavelengths of all the light beams in the detection light beam. Or, the transmission wavelength of the third optical thin film 216 and the transmission wavelength of the second optical thin film 214 can also be different, that is, the transmission wavelength of the second optical thin film 214 includes the wavelengths of a part of the light beams in the detection light beam, and the transmission wavelength of the third optical thin film 216 includes the wavelengths of another part of the light beams in the detection light beam.

[0089] Based on the above, the optical glass 212 can be provided with an optical thin film (the second optical thin film 214) on the side through which the reflected light beam is transmitted, or optical thin films can be provided on both sides (the second optical thin film 214 and the third optical thin film 216) to filter the reflected light beam, so as to suppress the interference light beam from being transmitted to the photodetector 202, ensure a high signal-to-noise ratio of the PPG waveform, and guarantee the accuracy of the obtained health indicators.

[0090] Moreover, the transmission wavelength of the third optical thin film 216 can be the same as that of the second optical thin film 214, or the transmission wavelength of the third optical thin film 216 can also be different from that of the second optical thin film 214. If the transmission wavelength of the third optical thin film 216 is the same as that of the second optical thin film 214, then both the transmission wavelength of the third optical thin film 216 and the transmission wavelength of the second optical thin film 214 correspond to the wavelength of the detection light beam, so that the detection light beam can be transmitted through the third optical thin film 216 and the second optical thin film 214 to the photodetector 202, while the light beam other than the detection light beam cannot be transmitted through the third optical thin film 216 and the second optical thin film 214 to the photodetector 202.

[0091] If the transmission wavelength of the third optical thin film 216 can also be different from that of the second optical thin film 214, the transmission wavelength of the second optical thin film 214 corresponds to the wavelength of a part of the light beam in the detection light beam, and the transmission wavelength of the third optical thin film 216 corresponds to the wavelength of the remaining part of the light beam in the detection light beam, so that the second optical thin film 214 and the third optical thin film 216 can cooperate to make the light beam other than the detection light beam unable to be transmitted through the third optical thin film 216 and the second optical thin film 214 to the photodetector 202.

[0092] In an embodiment of the present application, as Figure 7 shown, Figure 7 is a schematic structural diagram of the detection part 200. The detection part 200 further includes a display unit 218, and the display unit 218 is located outside any side of the housing 208 and is used to display the health indicators of the detected target. That is to say, the detection part 200 can include a display screen arranged outside any side of the housing 208 to display the health indicators of the detected target, so that the user can intuitively know the detected health indicators and improve the user experience.

[0093] In an embodiment of the present application, the detection beam further includes a second laser beam with a second wavelength and a third laser beam emitting a third wavelength. Among them, the value of the first wavelength can be 660 nm, the value of the second wavelength can be 520 nm, and the value of the third wavelength can be 940 nm. That is, the detection beam can include laser beams of red light (the first laser beam), green light (the second laser beam), and infrared (the third laser beam). However, the present application does not limit this. The above detection beam can also include laser beams of other wavelengths, depending on the specific situation.

[0094] Based on the above first laser beam, second laser beam, and third laser beam, the transmittance curve of the first optical thin film 204 can be as Figure 8 shown. Similarly, when the transmittance wavelengths of the second optical thin film 214 and the third optical thin film 216 include all the laser beams of the detection beam, the transmittance curves of the second optical thin film 214 and the third optical thin film 216 can also be as Figure 8 shown. When the transmittance wavelengths of the second optical thin film 214 and the third optical thin film 216 combined include all the laser beams of the detection beam, the transmittance curve of the combination of the second optical thin film 214 and the third optical thin film 216 can also be as Figure 8 shown. It should be noted that Figure 8 This is only a schematic diagram of the transmittance curve. However, in reality, the transmittance of different beams may be the same or different.

[0095] It should be noted that hemoglobin has a relatively high absorption rate for red light and green light. Therefore, when red light or green light penetrates the skin and tissues, a part of it will be absorbed by hemoglobin in the blood, and the remaining part will be reflected and received by the photodetector 202 (such as a photodiode) and converted into an electrical signal. When the heart beats, the blood flows in the blood vessels, resulting in a change in local blood volume and the amount of hemoglobin, and further causing a change in the amount of light absorbed by hemoglobin. The intensity of the reflected light will also fluctuate. The photodetector 202 converts this periodic change in light intensity into an electrical signal, forming a signal similar to a PPG waveform. The processing unit 206 can calculate the number of heartbeats per minute (i.e., the heart rate) of the detection target by analyzing the periodic fluctuations of the PPG signal, and the processing unit 206 can also estimate blood pressure by analyzing the PPG waveform.

[0096] Blood oxygen saturation (SpO2) is defined as the percentage of oxyhemoglobin (HbO2) in total hemoglobin (Hb + HbO2). Oxyhemoglobin (HbO2) has strong absorption of infrared light (850nm - 940nm) and weak absorption of red light (600nm - 750nm). Deoxyhemoglobin (Hb), on the contrary, has strong absorption of red light and weak absorption of infrared light. By combining the absorption differences of red light and infrared light, the proportion of oxyhemoglobin in the blood can be calculated, and thus the blood oxygen saturation can be obtained.

[0097] Based on the above, the detection device can obtain the heart rate and blood pressure of the detection target by detecting at least one of the first laser beam and the second laser beam in the detection beam, and can also obtain the blood oxygen saturation of the detection target through the first laser beam and the third laser beam.

[0098] It should be noted that the methods used by this detection device to obtain the above heart rate, blood pressure, and blood oxygen saturation can be the same as those used by existing detection devices with LED light sources, and will not be elaborated here.

[0099] In an embodiment of the present application, as Figure 2 shown, the light source part 100 further includes a light homogenizing unit 104, a spatial light modulation unit 106, and a projection lens 108, and the laser light source 102 is also used to emit a fourth laser beam with a fourth wavelength, which is different from the first wavelength, the second wavelength, and the third wavelength, that is, the wavelengths of the first laser beam, the second laser beam, the third laser beam, and the fourth laser beam are all different, that is, the wavelength of the fourth laser beam is different from the wavelength of the detection beam.

[0100] The patch-type health index detection device can realize the health index detection function of the detection target based on the detection beam and the detection part 200, such as obtaining the above-mentioned heart rate, blood pressure, and blood oxygen saturation, etc. Among them, when the detection device realizes the health index detection function, the detection beam can be transmitted through the light homogenizing unit 104 and the spatial light modulation unit 106 in sequence, and is transmitted to the target area by the projection lens 108.

[0101] The patch-type health index detection device can also realize the projection function based on the first laser beam, the second laser beam, and the fourth laser beam, as well as the light homogenizing unit 104, the spatial light modulation unit 106, and the projection lens 108 in the light source part 100, so as to project and display the health index of the obtained detection target to apply to more application scenarios. In addition, the above light source part can also realize projection functions other than projecting and displaying health indexes, such as projecting pictures or animations, etc. Among them, when the detection device realizes the projection function, the first laser beam, the second laser beam, and the fourth laser beam are transmitted through the light homogenizing unit 104, the spatial light modulation unit 106, and the projection lens 108 in sequence.

[0102] It should be noted that the light homogenizing unit 104 may include an aspherical lens, a compound eye lens, a light bar, and a diffractive optical element (DOE for short). The spatial light modulation unit 106 may be a digital micromirror device (DMD for short), liquid crystal, or liquid crystal on silicon (LCOS for short). The bandpass range of the projection lens 108 may be 400 nm to 1100 nm.

[0103] Optionally, the value of the fourth wavelength may be 465 nm, but the present application does not limit this, and it depends on the specific situation.

[0104] In an embodiment of the present application, the detection part 200 further includes a data sending unit (not shown in the figure), such as Bluetooth, etc. The data sending unit is communicatively connected to the processing unit 206 and is used to output the health indicators of the detected target. For example, the health indicators of the detected target obtained can be sent to electronic devices such as a computer or a mobile phone through the data sending unit for storage or viewing, etc.

[0105] In summary, the present application provides a health indicator detection device, which includes a light source part and a detection part. The laser element in the light source part emits a detection beam, and the detection beam includes at least a first laser beam of a first wavelength. The detection part can be attached to the target area of the detected target and includes a photodetector, a first optical film on the light incident side of the photodetector, and a processing unit. The first optical film is a film with a light filtering function, and its transmission wavelength may include the wavelength of the detection beam. Among them, the detection beam can be transmitted through the detection part to the target area, penetrate the target area to a preset depth, and be reflected at the preset depth of the target area to form a reflected beam. The reflected beam is transmitted to the photodetector through the first optical film, and the photodetector forms a detection signal based on the reflected beam. The processing unit obtains the health indicators of the detected target based on the detection signal. Based on the above, the detection device has a low cost, a fast detection speed, and high accuracy of the detection result.

[0106] In this specification, each embodiment is described in a progressive, or parallel, or a combination of progressive and parallel manners. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the relevant parts, reference can be made to the description in the method part.

[0107] It should be noted that in the description of this application, it should be understood that the orientation or positional relationships indicated by terms such as "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be intermediate components present simultaneously.

[0108] It should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that an article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the article or device comprising the above elements.

[0109] The above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A patch-type health index detection device, characterized in that include: A light source part, the light source part includes a laser light source, the laser light source is used to emit a detection light beam, the detection light beam at least includes a first laser light beam of a first wavelength; A detection part, the detection part is used to be attached to a target area of ​​a detection target, the detection part includes a photodetector and a first optical film located on the light incident side of the photodetector, and a processing unit; wherein the transmission wavelength of the first optical film includes the wavelength of the detection light beam; The detection light beam is transmitted to the target area through the detection part, penetrates the target area to a preset depth, and is reflected at the preset depth of the target area to form a reflection light beam, and the reflection light beam is transmitted to the photodetector through the first optical film; The photoelectric detector forms a detection signal based on the reflected light beam, and the processing unit obtains a health indicator of the detection target based on the detection signal.

2. The patch-type health index detection device according to claim 1, wherein The detection part further comprises a shell, the shell is a non-transparent shell, and the inner area of ​​the shell is exposed on one side of the shell facing the target area, and the photoelectric detector and the processing unit are located in the shell; The housing comprises a light entrance hole, which is opposite to the target area and located at a side of the housing away from the target area. The detection light beam enters the inner area of ​​the housing through the light entrance hole and is transmitted to the target area.

3. The patch-type health index detection device according to claim 2, wherein The detection part also includes a circuit board, which is located in the housing and connected to the housing, and the plane where the circuit board is located is parallel to the plane where the side of the housing away from the target area is located; The circuit board comprises a through hole, the through hole is opposite to the light entrance hole, and the detection light beam is transmitted to the target area through the light entrance hole and the through hole in sequence; The processing unit is disposed on the circuit board and is located in a region outside the through hole in the circuit board; The photoelectric detector is arranged on the circuit board and is located in a region outside the through hole in the circuit board.

4. The patch-type health index detection device according to claim 3, wherein, The light entrance hole is located in the middle area of ​​the housing on a side away from the target area; The through hole is located in the middle area of ​​the circuit board, and along a direction perpendicular to the plane where the circuit board is located, the center of the light entrance hole and the center of the through hole are located in the same straight line; Wherein, along a direction parallel to the plane where the circuit board is located, the width of the through hole is equal to or smaller than the width of the light incident hole.

5. The patch-type health index detection device according to claim 3, wherein, The photoelectric detector includes N detectors, N≥2; The N detectors are arranged in a direction surrounding the through hole, and the N detectors are arranged symmetrically relative to the through hole; Wherein, N=2, the N detectors are respectively located on two opposite sides of the through hole, and the connecting line of the N detectors passes through the center of the through hole; N≥3, along the direction surrounding the through hole, the angle between the i-th detector and the i+1-th detector among the N detectors and the straight line formed with the center of the through hole is a first angle, the angle between the i+1-th detector and the i+2-th detector and the straight line formed with the center of the through hole is a second angle, the first angle is equal to the second angle, 1≤i≤N-3.

6. The patch-type health index detection device according to claim 5, characterized in that, The first optical thin film includes N sub-optical thin films corresponding to the N detectors one by one. The N sub-optical thin films are respectively located on the light incident side of the corresponding detectors, and the transmission wavelengths of the sub-optical thin films correspond to the wavelengths of one kind of light beam in the detection light beam; Wherein, the value range of the bandwidth of the sub-optical thin film is 10nm to 20nm, including the end values.

7. The patch-type health index detection device according to claim 5, wherein, N = 3; or N = 4; or N=6。 8. The patch-type health index detection device according to claim 3, characterized in that, The detection part further includes an optical glass, which is located inside the housing, connected to the housing, and the plane where the optical glass is located is parallel to the plane where the circuit board is located, and the optical glass is closer to the target area than the circuit board; Along the direction perpendicular to the plane where the circuit board is located, the optical glass is not connected to the circuit board, and there is a preset distance between the optical glass and the circuit board; Wherein, one side of the optical glass facing away from the circuit board includes a second optical thin film, and one side of the optical glass facing away from the target area further includes a third optical thin film. Along the direction perpendicular to the plane where the optical glass is located, the projections of the second optical thin film and the third optical thin film do not overlap; the transmission wavelength of the second optical thin film at least includes the wavelength of one kind of light beam in the detection light beam, the transmission wavelength of the third optical thin film at least includes the wavelength of one kind of light beam in the detection light beam, and the transmission wavelengths of the second optical thin film and the third optical thin film jointly include the wavelengths of all light beams in the detection light beam.

9. The patch-type health index detection device according to claim 8, wherein The transmission wavelength of the third optical thin film is the same as that of the second optical thin film, or the transmission wavelength of the third optical thin film is different from that of the second optical thin film.

10. The patch-type health index detection device according to claim 2, wherein The detection part further includes a display unit, which is located outside any side of the housing and is used to display the health index of the detected target obtained.

11. The patch-type health index detection device according to claim 1, characterized in that The detection light beam further includes a second laser beam with a second wavelength and a third laser beam emitting a third wavelength; Wherein, the value of the first wavelength is 660nm, the value of the second wavelength is 520nm, and the value of the third wavelength is 940nm.

12. The patch-type health index detection device according to claim 11, wherein, The light source part further includes a light homogenizing unit, a spatial light modulation unit and a projection lens, and the laser light source is further used to emit a fourth laser beam with a fourth wavelength, and the fourth wavelength is different from the first wavelength, the second wavelength and the third wavelength; The patch-type health index detection device realizes the health index detection function of the detected target based on the detection light beam and the detection part; wherein, the detection light beam is sequentially transmitted through the light homogenizing unit and the spatial light modulation unit, and is transmitted to the target area by the projection lens; The patch-type health index detection device realizes a projection function based on the first laser beam, the second laser beam, and the fourth laser beam, as well as the light homogenizing unit, the spatial light modulation unit, and the projection lens in the light source part, so as to project and display the health index of the detected target obtained; wherein, the first laser beam, the second laser beam, and the fourth laser beam are sequentially transmitted through the light homogenizing unit, the spatial light modulation unit, and the projection lens.

13. The patch-type health index detection device according to claim 12, characterized in that, The value of the fourth wavelength is 465 nm.

14. The patch-type health index detection device according to claim 1, wherein The detection part further includes a data sending unit, which is communicatively connected to the processing unit and is used for outputting the health index of the detected target obtained.

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