Wearable system and blood pressure measuring method

Abstract

The invention discloses a wearable system and a blood pressure measuring method. The wearable system comprises a first wearable device. The first wearable device includes: a closed outer ring; the first adjustable structure is attached to the closed outer ring and used for adjusting the inner wearing space of the first wearable device under the condition that the length of the closed outer ring is fixed, and when a user wears the first wearable device, the first body part of the user is put into the inner wearing space; the first light source is used for emitting first light towards the inner wearing space; a first PPG sensor for sensing a first PPG signal generated according to the first light; the first pressure sensor is used for sensing pressure caused by the first body part. By the disclosed systems and methods, blood pressure may be measured using a wearable device. In addition, the wearable device does not need to be calibrated frequently according to the measurement result of the sphygmomanometer.

Description

Technical Field

[0001] This invention relates to wearable systems and methods for measuring blood pressure, and particularly to wearable systems and methods for measuring blood pressure optically. Background Technology

[0002] Existing methods of blood pressure measurement typically require specialized devices, such as blood pressure monitors or stethoscopes. With technological advancements, wearable devices capable of measuring blood pressure are becoming increasingly common. However, this method is indirect. For example, blood pressure is measured based on the PTT (Pulse Transmission Time) signal. Therefore, when a user's blood pressure is unstable, the measured blood pressure can easily become inaccurate. Furthermore, wearable devices performing this type of blood pressure measurement often require calibration based on the results from a blood pressure monitor.

[0003] Therefore, a new wearable system and a new method for measuring blood pressure are needed. Summary of the Invention

[0004] One objective of this invention is to disclose a wearable system for measuring blood pressure.

[0005] Another objective of this invention is to disclose a blood pressure measurement method that can measure blood pressure through a wearable system.

[0006] An embodiment of the present invention discloses a wearable system including a first wearable device. The first wearable device includes: a closed outer ring; a first adjustable structure attached to the closed outer ring for adjusting the internal wearing space of the first wearable device when the length of the closed outer ring is fixed, wherein when a user wears the first wearable device, a first body part of the user is placed in the internal wearing space; a first light source for emitting first light toward the internal wearing space; a first PPG (Photoplethysmography) sensor for sensing a first PPG signal generated based on the first light; and a first pressure sensor for sensing pressure caused by the first body part.

[0007] Another embodiment of the present invention discloses a wearable system comprising a first wearable device, a second wearable device, and a processing circuit. The first wearable device is worn on a first body part of a user and includes a first pressure sensor. The second wearable device includes a compression device for compressing a second body part of the user; and a second pressure sensor. The processing circuit calculates the time difference between a first arrival time of a first pressure signal and a second arrival time of a second pressure signal when the compression device compresses and then releases the second body part, wherein the first arrival time represents the time when the peak region of the first pressure signal reaches the first pressure sensor, and the second arrival time represents the time when the peak region of the second pressure signal reaches the second pressure sensor; wherein the processing circuit calculates the user's blood pressure based on the time difference, the signal start time of the first pressure signal and the signal end time of the second pressure signal, and the user's heart rate.

[0008] Another embodiment of the present invention discloses a blood pressure measurement method used in a first wearable device including a closed outer ring, characterized by comprising: (a) emitting a first light toward an internal wearable space of the first wearable device, wherein the internal wearable space is adjustable with a fixed length of the closed outer ring, wherein a user places a first body part of the user into the internal wearable space when wearing the first wearable device, and the first light is generated by a first light source of the first wearable device; (b) sensing a first PPG signal generated based on the first light using a first PPG sensor of the first wearable device; (c) sensing pressure caused by the first body part using a first pressure sensor of the first wearable device; and (d) calculating the user's blood pressure based on the pressure and the signal integrity of the first PPG signal.

[0009] According to the above embodiments, blood pressure can be measured using a wearable device, increasing the convenience of blood pressure measurement. Furthermore, the wearable device performing this blood pressure measurement method does not require frequent calibration based on the blood pressure monitor's measurement results. Attached Figure Description

[0010] Figure 1 A schematic diagram of a wearable system according to an embodiment of the present invention is shown.

[0011] Figure 2 This is a schematic diagram illustrating an embodiment of the present invention. Figure 1 The open and closed states of the closed outer ring in the middle.

[0012] Figure 3A and Figure 3B A schematic diagram of a wearable system according to an embodiment of the present invention is shown.

[0013] Figure 4 An illustration is provided according to an embodiment of the present invention. Figure 1 , Figure 3A and Figure 3B A schematic diagram of the action of a wearable system.

[0014] Figure 5 A schematic diagram of a wearable system according to another embodiment of the present invention is shown.

[0015] Figure 6 A schematic diagram illustrating the detailed structure of a second wearable device according to an embodiment of the present invention is shown.

[0016] Figure 7 and Figure 8 The illustration depicts an embodiment of the present invention. Figure 5 and Figure 6 A schematic diagram of the action of a wearable system.

[0017] Figure 9 A flowchart illustrating a blood pressure measurement method according to an embodiment of the present invention is shown.

[0018] Figure 10 A flowchart illustrating a blood pressure measurement method according to another embodiment of the present invention is shown.

[0019] The reference numerals in the attached figures are explained as follows:

[0020] 100_1 First Wearable Device

[0021] 100_2 Second Wearable Device

[0022] 101 Closed outer ring

[0023] 103 Internal Wearable Space

[0024] 105 Processing Circuit

[0025] 301 Inflatable Cuff

[0026] 303 Dynamic Button

[0027] 501 fingers

[0028] 601 Compression Device

[0029] 603 Processing Circuit

[0030] LH left hand

[0031] LS_1 First Light Source

[0032] LS_2 Second Light Source

[0033] MP_1 and MP_2 movable parts

[0034] PRS_1 First Pressure Sensor

[0035] PRS_2 Second Pressure Sensor

[0036] PPS_1 First PPG Sensor

[0037] PPS_2 Second PPG Sensor

[0038] S_PR1 First Pressure Signal

[0039] S_PR2 Second Pressure Signal

[0040] T_1 First Arrival Time

[0041] T_2 Second Arrival Time

[0042] Thr_1 First Integrity Level

[0043] Thr_2 Second Integrity Level

[0044] T_SBP1 First Signal Start Time

[0045] T_SBP2 Second Signal Start Time

[0046] T_DBP1 First Signal End Time

[0047] T_DBP2 Second Signal End Time

[0048] S_PP1 First PPG Signal

[0049] S_PP2 second PPG signal Detailed Implementation

[0050] The present invention will now be described with reference to several embodiments. The terms "first," "second," and similar descriptions used in the following description are merely for defining different elements, parameters, data, signals, or steps, and are not intended to limit their order. For example, the first device and the second device may be devices having the same structure but being different devices.

[0051] Figure 1 A schematic diagram of a wearable system according to an embodiment of the present invention is illustrated. Figure 1 In one embodiment, the wearable system includes a first wearable device 100_1, which is a ring, but the first wearable device 100_1 can also be any other device besides a ring. Figure 1As shown, the first wearable device 100_1 includes a first adjustable structure, a closed outer ring 101, a first light source LS_1, a first PPG sensor PPS_1, and a first pressure sensor PRS_1. Details of the first adjustable structure will be described in detail below. In one embodiment, the closed outer ring 101 may be made of a solid, such as wood, plastic, ceramic, or metal. In this case, the closed outer ring 101 has a fixed shape and a fixed length.

[0052] In one embodiment, the closed outer ring 101 can be open or closed. Figure 2 This is a schematic diagram illustrating an embodiment of the present invention. Figure 1 The closed outer ring 101 can be in the open and closed states. Please also note that the closed outer ring 101 can be "opened" or "closed" through different structures, and is not limited to... Figure 2 The structure shown.

[0053] like Figure 2 As shown, the closed outer ring 101 includes movable parts MP_1 and MP_2. Figure 2 In the above diagram, the movable parts MP_1 and MP_2 are in the open position, therefore the closed outer ring 101 is open (not having a closed shape). Conversely, in Figure 2 In the figure below, movable portions MP_1 and MP_2 are in the closed position, thus the closed outer ring 101 is closed (having a closed shape). Note that regardless of whether the closed outer ring 101 is "open" or "closed," other components of the first wearable device 100_1 can still be attached to the closed outer ring 101. In one embodiment, the closed outer ring 101 is open when the first wearable device 100_1 is not worn by a user or is about to be worn by a user. Conversely, when the first wearable device 100_1 has been worn by a user, the outer ring 101 is closed.

[0054] The first adjustable structure is attached to the closed outer ring to adjust the internal wearing space 103 of the first wearable device 100_1 when the length of the closed outer ring 101 is fixed. In other words, when the internal wearing space 103 of the first wearable device 100_1 is at a first value, the length of the closed outer ring 101 is a first length, but when the internal wearing space 103 is adjusted from the first value to a second value, the length of the closed outer ring 101 remains the first length. When the user wears the first wearable device 100_1, they place a part of their body into the internal wearing space 103. For example, if the first wearable device 100_1 is a ring, the user places their finger into the internal wearing space 103 when wearing the first wearable device 100_1. As another example, if the first wearable device 100_1 is a wristband, the user places their wrist in the internal wearing space 103 when wearing the first wearable device 100_1. For example, if the first wearable device 100_1 is an armband, then when the user wears the first wearable device 100_1, he puts his upper arm into the internal wearing space 103.

[0055] In one embodiment, the length of the closed outer ring 101 is adjustable in non-operating mode, but not in operating mode. Operating mode may represent, for example, the first wearable device 100_1 calculating the user's blood pressure or about to calculate the user's blood pressure. Conversely, non-operating mode may represent the first wearable device 100_1 not calculating blood pressure. However, operating mode and activating operating mode can have different meanings.

[0056] Therefore, in operating mode, the internal wearable space 103 can be changed through the first adjustable structure, rather than by changing the length of the closed outer ring 101. The function of "the length of the closed outer ring 101 not being adjustable in operating mode" can be achieved in various ways. For example, if the length of the closed outer ring 101 can be changed by executing a program, the program can be designed so that the user cannot change the length of the closed outer ring 101 in operating mode.

[0057] The first adjustable structure can be achieved through a variety of structures. Figure 3A and Figure 3B A schematic diagram of a wearable system according to an embodiment of the present invention is shown. Please also note that, for ease of explanation, Figure 3A and Figure 3B The symbols for some components are not shown in the drawing. Figure 3A In one embodiment, the first adjustable structure is an inflatable cuff 301. When the inflatable cuff 301 is inflated, the internal wearing space 103 becomes smaller. Conversely, when the inflatable cuff 301 is not inflated, the internal wearing space 103 becomes larger.

[0058] exist Figure 3B In one embodiment, the first adjustable structure is a dynamic button 303 that can be pressed or released. When the dynamic button 303 is released (e.g., released into the closed outer ring 101 of the first wearable device 100_1), the internal wearing space 103 expands, thereby providing less pressure to the user. Conversely, when the dynamic button 303 is pressed (e.g., pressed out of the closed outer ring 101 of the first wearable device 100_1), the internal wearing space 103 shrinks, thereby providing greater pressure to the user. Note that in one embodiment, the dynamic button 303 is gradually released over a predetermined time interval after being pressed. Other adjustable structures may also follow this type of operation. The structure of the first adjustable structure is not limited to... Figure 3A and Figure 3B The example shown. For instance, the first adjustable structure could be a mechanical structure.

[0059] Please refer to this again. Figure 1 The first light source LS_1 is used to emit first light into the internal wearable space 103. The first PPG sensor PPS_1 can be an optical sensor such as an image sensor or a photo detector, used to detect the first PPG signal generated based on the first light. The first pressure sensor PRS_1 is used to sense the pressure caused by the aforementioned first body part within the internal wearable space 103.

[0060] The first wearable device 100_1 may further include a processing circuit 105 for calculating the user's blood pressure based on the pressure sensed by the first pressure sensor PRS_1 and the signal integrity of the PPG signal (e.g., the first PPG signal) detected by the first PPG sensor PPS_1. Figure 4 An illustration is provided according to an embodiment of the present invention. Figure 1 , Figure 3A and Figure 3B A schematic diagram of the operation of a wearable system. (Example) Figure 4 As shown, if the internal wearing space 103 is small, it will compress the user's blood vessels, resulting in low signal integrity of the PPG signal (i.e., incomplete waveform of the PPG signal). In this situation, the processing circuit 105 can calculate the systolic pressure based on the pressure at which the signal integrity increases to a level greater than the first integrity level Thr_1. Signal integrity can be replaced by the amplitude of the PPG signal. In one embodiment, the systolic pressure is M × pressure, where M is a natural number. M can be determined by various methods. For example, the actual systolic pressure can be measured with a blood pressure monitor, and then M can be determined by calculating the relationship between the systolic pressure and the pressure.

[0061] Conversely, if the internal wearing space 103 is large, the user's blood vessels will not be compressed, thus resulting in higher signal integrity of the PPG signal (i.e., a complete waveform of the PPG signal). In this case, when the signal integrity increases to a level greater than the second integrity level Thr_2 (where the second integrity level Thr_2 is higher than the first integrity level Thr_1), the processing circuit 105 can calculate the diastolic pressure based on the pressure. In one embodiment, the diastolic pressure is N × pressure, where N is a natural number. N can be determined in various ways. For example, the actual diastolic pressure can be measured with a blood pressure monitor, and then N can be determined by calculating the relationship between the actual diastolic pressure and the pressure.

[0062] In more detail, Figure 4 The action shown is a continuous process. First, the user's body part is compressed (i.e., the internal wearing space 103 decreases), causing the PPG signal waveform to become incomplete or disappear. Then, the user's body part is gradually relaxed (i.e., the internal wearing space 103 gradually increases), allowing the PPG signal waveform to gradually become complete. As described above, the systolic and diastolic blood pressure can be measured during this process.

[0063] exist Figure 4 In this embodiment, blood pressure is measured based on the PPG signal. However, blood pressure can also be measured using the pressure sensor PRS_1, without relying on the PPG signal. Details of this type of embodiment will be described in more detail in the following embodiments. Note that in the steps of measuring blood pressure using the PPG signal or using the pressure sensor, the user's heart rate can also be referenced to calculate the systolic or diastolic blood pressure. In the above embodiment, the wearable system includes only one wearable device (first wearable device 100_1). However, the wearable system may also include multiple wearable devices. Figure 5 A schematic diagram of a wearable system according to another embodiment of the present invention is illustrated. Figure 5 As shown, this wearable system includes a second wearable device 100_2 in addition to the first wearable device 100_1. Figure 5 In the illustrated embodiment, the first wearable device 100_1 is a ring worn on the finger 501 of the left hand LH, and the second wearable device 100_2 is a watch worn on the wrist of the left hand LH. Therefore, when the user wears the first wearable device 100_1 and the second wearable device 100_2, the distance between the first wearable device 100_1 and the user's heart is greater than the distance between the second wearable device 100_2 and the heart. In other words, the second wearable device 100_2 is closer to the user's heart than the first wearable device 100_1. The first wearable device 100_1 and the second wearable device 100_2 can also be replaced by other wearable devices, not limited to rings and watches.

[0064] In short, in one embodiment, both wearable devices are worn on the same arm of the user. If the wearable device closer to the heart compresses the arm, the blood pressure measured by the wearable device farther from the heart will be affected. Detailed operation of the wearable devices will be described below.

[0065] The first wearable device 100_1 may include Figure 1 , Figure 2 , Figure 3A , Figure 3B , Figure 4 as well as Figure 5 The structures shown in the embodiments are not limited thereto. Figure 6 A schematic diagram illustrating the detailed structure of a second wearable device according to an embodiment of the present invention is shown. Figure 6 As shown, the second wearable device 100_2 includes a compression device 601, a processing circuit 603, a second pressure sensor PRS_2, a second PPG sensor PPS_2, and a second light source LS_2. It should also be noted that the positions of the components in the second wearable device 100_2 are not limited to... Figure 6 The example shown. Furthermore, the second wearable device 100_2 may also include only... Figure 6 The components shown are a subset of the components.

[0066] Figure 7 and Figure 8 The illustration depicts an embodiment of the present invention. Figure 5 and Figure 6 A schematic diagram illustrating the operation of a wearable system. Figure 7 In one embodiment, the compression device 601 compresses the user's second body part within a predetermined time interval and then gradually releases it, causing the blood vessels located in the second body part to be compressed and then released. After the compression device 601 compresses and releases the second body part, the processing circuit 603 calculates the time difference between the first arrival time T_1 of the first pressure signal S_PR1 and the second arrival time T_2 of the second pressure signal S_PR2.

[0067] Specifically, the first arrival time T_1 refers to the time it takes for the peak area of ​​the first pressure signal S_PR1 to reach the second pressure sensor PRS_2 of the second wearable device 100_2. The second arrival time T_2 refers to the time it takes for the peak area of ​​the second pressure signal S_PR2 to reach the first pressure sensor PRS_1 of the first wearable device 100_1. Both the first pressure signal S_PR1 and the second pressure signal S_PR2 can be generated by the compression and release of the compression device 601. The processing circuit 603 of the second wearable device 100_2 calculates the user's blood pressure based on the time difference. This method can also be regarded as calculating the user's blood pressure based on the pressure signal PPT. Note that the action of "calculating blood pressure based on time difference" can also be performed by the processing circuit 105 of the first wearable device 100_1.

[0068] In one embodiment, the first signal start time T_SBP1 of the first pressure signal S_PR1 and the second signal start time T_SBP2 of the second pressure signal S_PR2 are obtained. Furthermore, the first signal end time T_DBP1 of the first pressure signal S_PR1 and the second signal end time T_DBP2 of the second pressure signal S_PR2 are also obtained. The signal start time can represent the time when the amplitude of the pressure signal increases to exceed the first signal threshold, and the signal end time can represent the time when the amplitude of the pressure signal decreases to below the second signal threshold. In addition, the user's heart rate is also obtained. In this case, blood pressure can be calculated based on the time difference T1-T2, the first signal start time T_SBP1, the second signal start time T_SBP2, the first signal end time T_DBP1, the second signal end time T_DBP2, the heart rate, and the peak values ​​of the first pressure signal S_PR1 and the second pressure signal S_PR2. Specifically, diastolic blood pressure can be calculated based on the first signal end time T_DBP1, the second signal end time T_DBP2, the peak value, and the heart rate. In addition, systolic blood pressure can be calculated based on the first signal start time T_SBP1, the second signal start time T_SBP2, the peak value, and the heart rate. The heart rate mentioned here can be the average heart rate within a predetermined time interval.

[0069] like Figure 4 As described in the embodiments, blood pressure can be measured based on the pressure signal sensed by the first pressure sensor PRS_1, rather than on the PPG signal. This method is similar to... Figure 7The actions described are similar. However, this embodiment only has one wearable device (first wearable device 100_1). Therefore, the time difference T1-T2, the first signal start time T_SBP1, and the first signal end time T_DBP1 cannot be obtained. Therefore, in this embodiment, after the user's first body part is compressed and gradually released, blood pressure can be calculated based on the second signal start time T_SBP2, the second signal end time T_DBP2, the heart rate, and the peak value of the second pressure signal S_PR2. Specifically, diastolic blood pressure can be calculated based on the second signal end time T_DBP2, the peak value, and the heart rate. In addition, systolic blood pressure can also be calculated based on the second signal start time T_SBP2, the peak value, and the heart rate. The heart rate mentioned here can be the average heart rate within a predetermined time interval.

[0070] exist Figure 8 In one embodiment, the compression device 601 applies pressure to and then releases pressure on a second body part of the user, causing the blood vessels in the second body part to be compressed and then released, thereby producing... Figure 7 The pressure signal shown. Figure 8 In some embodiments, pressure signals can also be used to calculate blood pressure, which will be described in more detail later.

[0071] exist Figure 8 In this embodiment, a PPG signal can be acquired. More specifically, the second light source LS_2 emits a second light, and the second PPG sensor PPS_2 detects a second PPG signal S_PP2 generated based on the second light. The processing circuit 603 calculates the user's blood pressure based on the PPT signal of the first PPG signal S_PP1 and the second PPG signal S_PP2. The first PPG signal S_PP1 is generated by the first PPG sensor PPS_1 of the first wearable device 100_1. Note also that the action of "calculating the user's blood pressure based on the PPT signal" can also be performed by the processing circuit 105 of the first wearable device 100_1.

[0072] Embodiments using only PPG signals without pressure signals can be used in situations where it is neither possible nor appropriate to apply pressure to the user (e.g., when the user is asleep). For example, in one embodiment, blood pressure is calculated based on PPG signals and heart rate, but not on pressure signals. In this case, the calculated blood pressure changes can be used to monitor the user's physical condition.

[0073] Figure 7 and Figure 8 The illustrated embodiments can be combined. That is, blood pressure can be calculated based on the PPG signal and the pressure signal. For example, it can be calculated based on the time difference T_1-T_2 (i.e., the PPT signal), the signal start time, the signal end time, the heart rate, etc. Figure 8Blood pressure is calculated from the peak pressure signal in the PPG signal and the PPT signal in the PPG signal. Specifically, diastolic blood pressure can be calculated based on the time difference T_1-T_2, the end time of the first signal T_DBP1, the end time of the second signal T_DBP2, the peak value, heart rate, and the PPT signal in the PPG signal. Furthermore, systolic blood pressure can be calculated based on the time difference T_1-T2, the start time of the first signal T_SBP1, the start time of the second signal T_SBP2, the peak value, heart rate, and the PPT signal in the PPG signal.

[0074] In one embodiment, systolic blood pressure SBP and diastolic blood pressure DBP can be calculated according to the following formulas (1) and (2):

[0075] Formula (1)

[0076] SBP = A1 × PPG_PTT + A2 × Pressure_PTT + A3 × mean HR + A3 × HRV + C1 (Formula 2)

[0077] DBP=B1×PPG_PTT+B2×Pressure_PTT+B3×mean HR+B3×HRV+C2

[0078] PPG_PTT and Pressure_PTT are the PPT signals of the PPG and pressure signals, respectively. Mean_HR is the average heart rate over a predetermined time interval. HRV is the rate of change of heart rate. A1, A2, A3, B1, B2, C1, and C2 are constant values ​​that can be set according to different needs or the different designs of wearable devices.

[0079] Figure 9 A flowchart illustrating a blood pressure measurement method according to an embodiment of the present invention is shown. This blood pressure measurement method is applied to a first wearable device having a closed outer ring and includes the following steps:

[0080] Step 901

[0081] To the first wearable device (e.g., Figure 1 The first wearable device 100_1 emits first light from its internal wearable space, wherein the internal wearable space is adjustable, and the closed outer ring (e.g., Figure 1 The length of the closed outer ring 103 is fixed. When the user wears the first wearable device, their first body part is placed in the inner wearing space.

[0082] The first light was emitted by the first light source of the first wearable device.

[0083] Step 903

[0084] Through the first PPG sensor of the first wearable device (e.g., Figure 1 The first PPG sensor (PPS_1) in the system senses the first PPG signal generated by the first light.

[0085] Step 905

[0086] Through the first pressure sensor of the first wearable device (e.g., Figure 1 The first pressure sensor (PRS_1) senses the pressure exerted by the first body part.

[0087] Step 907

[0088] The user's blood pressure is calculated based on the pressure value and the signal integrity of the PPG signal (e.g., Figure 4 (Example shown).

[0089] Please note that in steps 901, 903, 905, and 907 above, the actions of sensing the PPG signal and sensing the pressure are performed by the same device (the first wearable device). However, these actions can be performed by different devices. For example, if Figure 5 The wearable system shown calculates blood pressure according to the steps disclosed in steps 901, 903, 905 and 907. The action of sensing pressure can be performed by the second wearable device 100_2, and the step of sensing PPG signal can still be performed by the first wearable device 100_1.

[0090] As mentioned above, blood pressure can be calculated based on the pressure signal but not on the PPF signal. In this situation, Figure 9 The blood pressure measurement method may also include: generating a pressure sensing signal by sensing pressure through a first pressure sensor; calculating blood pressure based on the signal start time, the signal end time, the user's heart rate, and the peak value of the pressure signal.

[0091] Figure 10 A flowchart illustrating a blood pressure measurement method according to another embodiment of the present invention is shown. Figure 10 The blood pressure measurement method shown corresponds to a wearable system including a first wearable device and a second wearable device, for example... Figure 5 The wearable system is shown. A first wearable device is worn on a first part of the user's body and includes a first pressure sensor. Additionally, a second wearable device includes a compression device and a second pressure sensor. In one embodiment, when the user wears both the first and second wearable devices, the distance between the first wearable device (e.g., first wearable device 100_1) and the user's heart is greater than the distance between the second wearable device (e.g., second wearable device 100_2) and the heart.

[0092] Figure 10Blood pressure measurement methods include

[0093] Step 1001

[0094] Pressing (pressing) the user's second body part.

[0095] Step 1003

[0096] Calculate the time difference between the first arrival time of the first pressure signal and the second arrival time of the second pressure signal when the compression device compresses and then releases the second body part (e.g., Figure 7 The time difference (T_1-T_2) in the middle.

[0097] The first arrival time represents the time when the peak region of the first pressure signal reaches the first pressure sensor, and the second arrival time represents the time when the peak region of the second pressure signal reaches the second pressure sensor.

[0098] Step 1005

[0099] The user's blood pressure is calculated based on the time difference between the first and second pressure signals, the signal start time (e.g., the first signal start time T_SBP1 and the second signal start time T_SBP2), the signal end time (e.g., the first signal end time T_DBP1 and the second signal end time T_DBP2), and the user's heart rate. Figure 8 As described in the embodiments, blood pressure can also be calculated based on the PPT signal of the PPG signal.

[0100] Please also understand that the methods and systems described above can be used to measure other physiological parameters, not just blood pressure.

[0101] According to the above embodiments, blood pressure can be measured using a wearable device, increasing the convenience of blood pressure measurement. Furthermore, the wearable device performing this blood pressure measurement method does not require frequent calibration based on the blood pressure monitor's measurement results.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wearable system, characterized in that, include: The first wearable device includes: Closed outer ring; A first adjustable structure is attached to the closed outer ring to adjust the internal wearing space of the first wearable device when the length of the closed outer ring is fixed, wherein when the user wears the first wearable device, the user's first body part is placed in the internal wearing space. A first light source is used to emit a first light into the internal wearable space; A first PPG (Photoplethysmography) sensor is used to sense a first PPG signal generated based on the first light; and The first pressure sensor is used to sense the pressure caused by the first body part.

2. The wearable system as described in claim 1, characterized in that, The closed outer ring can be opened or closed, and when the first wearable device is worn by the user, the closed outer ring is closed.

3. The wearable system as described in claim 1, characterized in that, The first wearable device further includes: The processing circuitry is used to calculate the user's blood pressure based on the pressure and the signal integrity of the PPG signal.

4. The wearable system as described in claim 3, characterized in that, When the signal integrity increases to a level greater than the first integrity level, the processing circuit calculates the systolic pressure based on the pressure.

5. The wearable system as described in claim 3, characterized in that, When the signal integrity increases to a level greater than the second integrity level, the processing circuit calculates the diastolic pressure based on the pressure.

6. The wearable system as described in claim 1, characterized in that, The first pressure sensor senses the pressure to generate a pressure sensing signal; The first wearable device further includes: The processing circuit is used to calculate blood pressure based on the start time of the pressure signal, the end time of the pressure signal, the user's heart rate, and the peak value of the pressure signal.

7. The wearable system as described in claim 1, characterized in that, The first adjustable structure is an inflatable cuff or a dynamic button.

8. The wearable system as described in claim 1, characterized in that, The first type of wearable device is a ring, wristband, or armband.

9. A wearable system, characterized in that, include: The first wearable device, worn on a first part of the user's body, includes: First pressure sensor; The second wearable device includes: Compression devices used to compress a user's second body part; and Second pressure sensor; as well as The processing circuit is used to calculate the time difference between the first arrival time of the first pressure signal and the second arrival time of the second pressure signal when the compression device compresses the second body part and then releases the second body part, wherein the first arrival time represents the time when the peak area of ​​the first pressure signal reaches the first pressure sensor, and the second arrival time represents the time when the peak area of ​​the second pressure signal reaches the second pressure sensor. The processing circuit calculates the user's blood pressure based on the time difference, the start time of the first pressure signal and the second pressure signal, the end time of the first pressure signal and the second pressure signal, and the user's heart rate.

10. The wearable system as described in claim 9, characterized in that, When the user wears the first wearable device and the second wearable device, the distance between the first wearable device and the user's heart is greater than the distance between the second wearable device and the heart.

11. A method for measuring blood pressure, used in a first wearable device comprising a closed outer ring, characterized in that, include: (a) A first light is emitted toward the internal wearing space of the first wearable device, wherein the internal wearing space is adjustable with the length of the closed outer ring being fixed, wherein when the user wears the first wearable device, the user's first body part is placed in the internal wearing space, and the first light is generated by the first light source of the first wearable device. (b) Sensing a first PPG signal generated based on the first light using a first PPG sensor of the first wearable device; (c) Sensing pressure caused by a first body part using a first pressure sensor of the first wearable device; and (d) Calculate the user's blood pressure based on the pressure and the signal integrity of the first PPG signal.

12. The blood pressure measurement method as described in claim 11, characterized in that, The closed outer ring can be opened or closed, and when the first wearable device is worn by the user, the closed outer ring is closed.

13. The blood pressure measurement method as described in claim 11, characterized in that, When the signal integrity increases to a level greater than the first integrity level, step (d) calculates the systolic pressure based on the pressure.

14. The blood pressure measurement method as described in claim 11, characterized in that, When the signal integrity increases to a level greater than the second integrity level, step (d) calculates the diastolic pressure based on the pressure.

15. The blood pressure measurement method as described in claim 11, characterized in that, Further includes: The first pressure sensor senses the pressure to generate a pressure sensing signal; Blood pressure is calculated based on the start time of the pressure signal, the end time of the pressure signal, the user's heart rate, and the peak value of the pressure signal.

16. The blood pressure measurement method as described in claim 11, characterized in that, The first wearable device includes a first adjustable structure, which is an inflatable cuff or a dynamic button.

17. The blood pressure measurement method as described in claim 11, characterized in that, Further includes: Calculate the time difference between the first arrival time of the first pressure signal and the second arrival time of the second pressure signal when the compression device of the second wearable device compresses and then releases the second body part of the user, wherein the first arrival time represents the time when the peak region of the first pressure signal reaches the first pressure sensor, and the second arrival time represents the time when the peak region of the second pressure signal reaches the second pressure sensor of the second wearable device; and The user's blood pressure is calculated based on this time difference.

18. The blood pressure measurement method as described in claim 17, characterized in that, When the user wears the first wearable device and the second wearable device, the distance between the first wearable device and the user's heart is greater than the distance between the second wearable device and the heart.

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