A blood pressure measurement device

Abstract

The application provides a blood pressure measuring device. The blood pressure measuring device comprises a main body and an air bag. The air bag has an air cavity and is fixed to one end of the main body. The main body has a cavity surrounded by a plurality of side walls. An air supply and exhaust device and a first air pressure sensor can be arranged in the cavity of the main body. The air supply and exhaust device comprises an air inlet channel and an air outlet channel, and the air supply and exhaust device is connected with the air cavity of the air bag through the first air channel. The first air pressure sensor comprises a first air hole and a second air hole, and a pressure diaphragm is arranged between the first air hole and the second air hole. In addition, a first air permeable hole is arranged in the side wall of the main body. The first air hole is connected with the air cavity of the air bag through a second air channel, and the second air hole is connected with the first air permeable hole through a third air channel. Since the air pressure on both sides of the pressure diaphragm of the first air pressure sensor is the air pressure in the air bag and the atmospheric pressure, the first air pressure sensor is not affected by the air pressure in the cavity, and the blood pressure measuring accuracy of the blood pressure measuring device is high.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202110869082.3, filed on July 30, 2021, entitled "A Blood Pressure Measuring Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of electronic equipment technology, and in particular to a blood pressure measuring device. Background Technology

[0004] Today, people are paying increasing attention to their own and their families' health, making blood pressure measurement particularly important. With the advancement of technology, not only have home blood pressure measurement devices emerged, but blood pressure measurement functions have also begun to be integrated into some wearable devices (such as smartwatches or smart bracelets), making it possible for users to measure their blood pressure anytime, anywhere.

[0005] Current blood pressure measuring devices all place the micro-pump and pressure sensor directly inside the main body of the device. The pressure sensor obtains the user's blood pressure value by measuring the air pressure inside the main body and the air bladder. However, during blood pressure measurement, the micro-pump inflates the air bladder, causing pressure fluctuations within the main body. This results in unstable air pressure detected by the pressure sensor, leading to lower accuracy in the measured blood pressure value.

[0006] Therefore, how to provide a blood pressure measuring device that can meet the accuracy requirements of blood pressure measurement has become a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] This application provides a blood pressure measuring device to reduce the influence of the internal air pressure of the blood pressure measuring device on its blood pressure measurement, thereby improving the accuracy of blood pressure measurement.

[0008] In a first aspect, this application provides a blood pressure measuring device, which may include a main body, an air bladder, an air supply and exhaust device, and a first pressure sensor. The main body includes a cavity, within which various functional modules or devices of the blood pressure measuring device can be housed, such as the aforementioned air supply and exhaust device and the first pressure sensor. The air bladder is fixed to one end of the main body and has an air cavity. The air supply and exhaust device includes an inlet air passage and a venting air passage, and is connected to the air cavity of the air bladder via a first air passage. The first pressure sensor includes a first vent, a second vent, and a pressure diaphragm, with the pressure diaphragm located between the first and second vents. The first vent is connected to the air cavity of the air bladder via the second air passage. Furthermore, the cavity of the main body may be formed by multiple sidewalls, each with a first vent hole that connects to the outside atmosphere. Thus, the second vent of the first pressure sensor can be connected to the first vent hole via a third air passage, thereby allowing the first pressure sensor to connect to the outside atmosphere via the first vent hole. The blood pressure measuring device provided in this application has high accuracy because the air pressure on both sides of the pressure diaphragm of the first air pressure sensor is the external atmospheric pressure and the air pressure inside the air chamber of the airbag, respectively.

[0009] Because the air supply and exhaust devices are located within the main body cavity, if both the intake and exhaust paths of these devices are connected to the cavity, a negative pressure (pressure difference between the inside and outside, i.e., the air pressure inside the cavity is lower than the external atmospheric pressure) will be generated within the cavity during operation. In traditional blood pressure measuring devices, waterproofing is not used to reduce this negative pressure. This is primarily because a waterproof membrane would reduce the device's permeability, leading to a higher negative pressure within the cavity and increasing systematic errors during measurement. Furthermore, the air pressure within the cavity and its fluctuations also contribute to measurement errors. However, since most components of a blood pressure measuring device are housed within the cavity, the lack of a waterproof design would significantly increase the risk of damage to these components, impacting the device's lifespan. To address this issue, in one possible implementation of this application, a second vent can be provided on the side wall of the main body. This second vent is connected to the outside atmosphere, allowing gas from the outside atmosphere to enter the cavity of the main body through the second vent, thereby replenishing the gas in the cavity of the main body in a timely manner and reducing the negative pressure inside the cavity.

[0010] In addition, to achieve a waterproof design for the blood pressure measuring device, a first waterproof and breathable device can be installed at the second vent. To minimize the impact of the first waterproof and breathable device on the air permeability at the second vent, the air permeability of the first waterproof and breathable device can be greater than or equal to 100 ml / min, thereby ensuring timely and stable replenishment of gas within the main body's cavity.

[0011] However, when the first waterproof and breathable device becomes clogged, its air permeability is significantly reduced, resulting in an increase in negative pressure within the cavity. In one possible implementation of this application, the clogging status of the first waterproof and breathable device can be determined by detecting its air permeability. Specifically, the blood pressure measuring device may further include a second pressure sensor disposed within the cavity of the main body. The blood pressure measuring device can determine the air permeability of the first waterproof and breathable device based on the pressure value measured by the second pressure sensor. The second pressure sensor can be an absolute pressure sensor; when the pressure value measured by the second pressure sensor is higher than a first threshold, the air permeability of the first waterproof and breathable device is considered good. In this application, the first threshold can be set according to the specific application scenario; for example, it can be 95 kPa. Therefore, when the pressure value measured by the second pressure sensor is higher than 95 kPa, the air permeability of the first waterproof and breathable device is considered good.

[0012] Correspondingly, in some possible implementations, when the air pressure value measured by the second air pressure sensor is lower than the first threshold, it can be determined that the first waterproof and breathable device is blocked.

[0013] It is understood that in this application, a second waterproof and breathable device may also be provided at the first vent to further improve the waterproof performance of the blood pressure measuring device.

[0014] As described above, one reason for the negative pressure within the body's cavity is the inflation and deflation of the airbag by the air supply and exhaust device. To reduce the impact of the air supply and exhaust device on the negative pressure within the body's cavity, in one possible implementation of this application, a fourth and fifth vent holes can be provided. The air intake path of the air supply and exhaust device can be connected to the outside atmosphere through the fourth vent hole, and the air exhaust path can be connected to the outside atmosphere through the fifth vent hole. In this way, the air supply and exhaust device can inflate the airbag with gas from the outside atmosphere through the fourth vent hole and the air intake path, and can expel the gas inside the airbag to the outside atmosphere through the air exhaust path and the fifth vent hole.

[0015] In this application, the air supply and exhaust device and the first pressure sensor can be directly or indirectly connected to the airbag via corresponding air passages. For example, in one possible implementation of this application, the blood pressure measuring device may further include an air passage cavity disposed within the main body. Furthermore, the air supply and exhaust device can be connected to the air passage cavity via a first air passage, the first air port of the first pressure sensor can be connected to the air passage cavity via a second air passage, and the air passage cavity can be connected to the airbag's air chamber via a fourth air passage. Thus, the air passages for the air supply and exhaust device and the first pressure sensor to connect to the airbag can be merged via the air passage cavity and then connected to the airbag via a single air passage. In this case, only one through-hole for connecting to the airbag needs to be opened on the side wall of the main body, thereby reducing the number of openings on the main body and improving the waterproof performance and structural stability of the blood pressure measuring device.

[0016] In one possible implementation of this application, a connection hole can be provided at the end of the main body to connect the airbag to the main body. Additionally, the airbag has a nozzle that protrudes from one side surface of the airbag towards the main body. This allows the airbag to communicate with the air passage cavity by inserting the nozzle into the connection hole and connecting the fourth air passage to the nozzle. Similarly, in other possible implementations, the nozzle can be located at the end of the main body, while the connection hole is provided on the airbag; this also allows the connection between the airbag and the main body to be achieved by inserting the nozzle into the connection hole.

[0017] It is worth mentioning that in this application, the airbag and the main body can be detachably connected, allowing the airbag to be disassembled or replaced as needed. Furthermore, in one possible implementation of this application, the blood pressure measuring device may also include a photoplethysmography (PPG) module and an ECG detection module, which can be disposed on the bottom surface of the main body. The airbag can also be fixedly connected to one end of the bottom surface of the main body, thereby integrating multiple measurement functions while making the structure of the blood pressure measuring device more compact.

[0018] To further improve the accuracy of blood pressure measurement in this application, a calibration device can also be provided for the first pressure sensor. In one possible implementation of this application, the blood pressure measuring device may further include a third pressure sensor, which includes a third air port and a fourth air port. Additionally, a third vent is provided on the side wall of the main body, which communicates with the outside atmosphere. The third air port of the third pressure sensor is connected to the air passage cavity via a seventh air path, while the fourth air port is connected to the third vent via an eighth air path. In this way, the third pressure sensor can measure the pressure difference between the outside atmosphere and the air pressure within the air chamber of the airbag.

[0019] Since the first pressure sensor also measures the pressure difference between the external atmosphere and the air pressure inside the air chamber of the airbag, the measurement value of the first pressure sensor can be calibrated by comparing the pressure differences measured by the first and third pressure sensors respectively. Specifically, when the difference between the pressure difference measured by the first and third pressure sensors is within a first threshold range, the pressure difference measured by the first pressure sensor is determined to be accurate. In this application, the first threshold range can be set according to the specific application scenario; for example, it can be -200 Pa to 200 Pa.

[0020] Similarly, if the difference between the pressure difference measured by the first pressure sensor and the pressure difference measured by the third pressure sensor is outside the first threshold range, then the pressure difference measured by the first pressure sensor is determined to be inaccurate.

[0021] In addition to the above-described configuration, the third pressure sensor used to calibrate the measurements of the first pressure sensor can, in one possible implementation of this application, be an absolute pressure sensor. In this implementation, the third pressure sensor includes only one third air port, which is connected to the air passage cavity via a seventh air passage. The calibration process of the first pressure sensor's measurements using this third pressure sensor is as follows: when the difference between the air pressure measured by the first pressure sensor and the air pressure measured by the third pressure sensor is within a first threshold range, the air pressure measured by the first pressure sensor is determined to be accurate; and / or, when the difference between the air pressure measured by the first pressure sensor and the air pressure measured by the third pressure sensor is outside the first threshold range, the air pressure measured by the first pressure sensor is determined to be inaccurate. This implementation reduces the number of ventilation holes on the main body, thereby improving the waterproof performance of the blood pressure measuring device.

[0022] In this application, to reduce the impact of gas flow fluctuations in each gas path on measurement accuracy, a buffer structure can be provided in the gas path pipes. For example, multiple protrusions can be provided in the pipe of the second gas path connecting the first pressure sensor and the air bladder. These protrusions are spaced apart and alternately arranged along the extension direction of the pipe. These protrusions can buffer the gas flow during its movement in the second gas path, thereby reducing gas flow fluctuations and improving the accuracy of the first pressure sensor.

[0023] Secondly, this application also provides a blood pressure measuring device, which may include a main body, an air bladder, an air supply and exhaust device, a first pressure sensor, and a second pressure sensor. The main body includes a cavity, within which various functional modules or devices of the blood pressure measuring device can be housed, such as the aforementioned air supply and exhaust device, the first pressure sensor, and the second pressure sensor. The air bladder is fixed to one end of the main body and has an air cavity. The air supply and exhaust device includes an inlet air passage and a venting air passage, and is connected to the air cavity of the air bladder via the first air passage. The first pressure sensor includes a first air hole, a second air hole, and a pressure diaphragm, with the pressure diaphragm located between the first and second air holes. The first air hole is connected to the air cavity of the air bladder via the second air passage, and the second air hole is connected to the cavity. Therefore, the pressure difference measured by the first pressure sensor is determined by the air pressure within the cavity of the main body and the air pressure within the air cavity of the air bladder. Furthermore, the second pressure sensor is an absolute pressure sensor and includes a fifth air hole, which is disposed opposite to the second air hole.

[0024] By employing the blood pressure measuring device provided in this application, and by installing a second pressure sensor within the cavity of the main body, the device can obtain the air pressure value within the air chamber of the airbag based on the external atmospheric pressure, the air pressure value measured by the second pressure sensor, and the pressure difference measured by the first pressure sensor. Furthermore, the difference between the external atmospheric pressure and the air pressure value measured by the second pressure sensor can be used as an error value for calculating the air pressure within the air chamber of the airbag, thus obtaining the true air pressure value within the airbag and effectively improving the accuracy of blood pressure measurement.

[0025] In one possible implementation of this application, the fifth air hole and the second air hole can be coaxially arranged, and the distance between the fifth air hole and the second air hole can be less than or equal to 1 mm. Since the second air pressure sensor includes only one fifth air hole, it can measure the air pressure inside the cavity of the main body. Furthermore, because the distance between the fifth air hole and the second air hole is small, the air pressure measured on the fifth air hole side can be considered equal to the air pressure measured on the second air hole side.

[0026] In one possible implementation of this application, a vent is provided on the side wall of the main body, and a waterproof and breathable device is installed at the vent. In this case, the blood pressure measuring device can also determine the breathability of the waterproof and breathable device based on the pressure value measured by the second pressure sensor. Specifically, when the pressure value measured by the second pressure sensor is higher than a first threshold, it can be determined that the breathability of the waterproof and breathable device is good. In this application, the first threshold can be set according to the specific application scenario; for example, it can be 95 kPa. Therefore, when the pressure value measured by the second pressure sensor is higher than 95 kPa, it is determined that the breathability of the waterproof and breathable device is good. Correspondingly, in some possible implementations, when the pressure value measured by the second pressure sensor is lower than the first threshold, it can be determined that the waterproof and breathable device is blocked. By detecting the breathability of the waterproof and breathable device, it can be replaced or cleaned in a timely manner when blockage occurs, thereby reducing the negative pressure inside the cavity of the main body and improving the measurement accuracy of the blood pressure measuring device.

[0027] Thirdly, this application also provides a blood pressure measuring device, which may include a main body, an air bladder, an air supply and exhaust device, a first pressure sensor, a second pressure sensor, and a waterproof and breathable device. The main body includes a cavity in which various functional modules or devices of the blood pressure measuring device can be housed, such as the aforementioned air supply and exhaust device, the first pressure sensor, and the second pressure sensor. The cavity is formed by multiple side walls with ventilation holes, and the waterproof and breathable device covers these ventilation holes. The air bladder is fixed to one end of the main body and has an air cavity. The air supply and exhaust device includes an inlet air passage and a venting air passage, and is connected to the air cavity of the air bladder via the first air passage. The first pressure sensor measures the air pressure within the air cavity of the air bladder. The second pressure sensor is an absolute pressure sensor; when the pressure value measured by the second pressure sensor is higher than a first threshold, the waterproof and breathable device is determined to have good breathability; and / or, when the pressure value measured by the second pressure sensor is lower than the first threshold, the waterproof and breathable device is determined to be blocked.

[0028] By using the blood pressure measuring device provided in this application, a second air pressure sensor can be installed in the cavity of the main body to detect the air permeability of the waterproof and breathable device. This allows for timely replacement or cleaning of the waterproof and breathable device, ensuring the safety of the blood pressure measuring device and the stability of its blood pressure measurement, thereby making the blood pressure value measured by the blood pressure measuring device more accurate. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a blood pressure measuring device provided in one embodiment of this application;

[0030] Figure 2This is a schematic diagram of the frame structure of an existing blood pressure measuring device provided in one embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the frame structure of a blood pressure measuring device provided in one embodiment of this application;

[0032] Figures 4a to 4c This is a schematic diagram of the internal structure of a gas path provided in one embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the frame structure of a blood pressure measuring device provided in another embodiment of this application;

[0034] Figure 6 This is a schematic diagram of the frame structure of a blood pressure measuring device provided in another embodiment of this application;

[0035] Figure 7 An exploded structural diagram of a waterproof and breathable device according to one embodiment of this application is provided;

[0036] Figure 8 This is a schematic diagram of the frame structure of a blood pressure measuring device provided in another embodiment of this application;

[0037] Figure 9 This is a partial structural schematic diagram of a blood pressure measuring device provided in one embodiment of this application;

[0038] Figure 10 This is a schematic diagram of the structure of an airbag provided in one embodiment of this application;

[0039] Figure 11 for Figure 10 Enlarged view of the local structure at point A;

[0040] Figure 12 This is a schematic diagram of the frame structure of a blood pressure measuring device provided in another embodiment of this application;

[0041] Figure 13 This is a schematic diagram of the frame structure of a blood pressure measuring device provided in another embodiment of this application;

[0042] Figure 14 This is a schematic diagram of the frame structure of a blood pressure measuring device provided in another embodiment of this application;

[0043] Figure 15 This is a schematic diagram of the frame structure of a blood pressure measuring device provided in another embodiment of this application.

[0044] Figure label:

[0045] 1-Main body; 101-Cavity; 102a, 102b, 102c, 102d, 102e-Ventilation holes; 103-Connection hole; 104-PPG module;

[0046] 105-ECG detection module; 2-Airbag; 201-Air nozzle; 2011-Snap-fit ​​structure; 3-Wristband; 4-Air supply and exhaust device;

[0047] 401 - Intake air passage; 402 - Exhaust air passage; 5a - First air pressure sensor; 501 - First air port; 502 - Second air port;

[0048] 5b - Second pressure sensor; 505 - Fifth vent; 5c - Third pressure sensor; 503 - Third vent; 504 - Fourth vent;

[0049] 61 - First airway; 62 - Second airway; 63 - Third airway; 64 - Fourth airway; 65 - Fifth airway; 66 - Sixth airway;

[0050] 67-Seventh air passage; 601-Pipe; 602-Protrusion; 7-Drive device; 8-First waterproof and breathable device; 801-Foam;

[0051] 802 - Balance hole steel sheet; 803 - PET layer; 804 - Waterproof membrane; 805 - Double-sided adhesive; 806 - Waterproof adhesive;

[0052] 9-Second waterproof and breathable device; 10-Air passage cavity; 11-Air valve; 12-Third waterproof and breathable device. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0054] To facilitate understanding of the blood pressure measuring device provided in this application embodiment, its application scenarios are first described below. This blood pressure measuring device can be, but is not limited to, a large device for measuring blood pressure, such as a medical or household device, or a portable electronic device with blood pressure measuring function, such as a smartwatch or smart bracelet. Taking a smartwatch as an example, it can be worn on the user's wrist to monitor the user's blood pressure and other vital signs at any time, enabling prediction of the user's physical condition and effectively preventing dangerous secondary complications such as stroke caused by hypertension.

[0055] Reference Figure 1 , Figure 1This is a schematic diagram of the structure of a smartwatch with blood pressure measurement function according to an embodiment of this application. A blood pressure measuring device with blood pressure detection function generally includes a main body 1 and an airbag 2, the airbag 2 being fixed to one end of the main body 1. For example, the airbag 2 can be fixed to one end face of the bottom surface of the main body 1. In this application, the bottom surface of the main body 1 refers to the surface of the main body 1 that directly contacts the wrist when the smartwatch is worn on the wrist. Additionally, the blood pressure measuring device may also include a wristband 3, such as... Figure 1 As shown, the air bladder 2 can be located on the side of the wristband 3 facing the user's wrist. This allows the air bladder 2 to be pressed against the wrist and fitted snugly when the wristband 3 is wrapped around the user's wrist, facilitating blood pressure measurement. It is understood that the air bladder 2 and wristband 3 can be fixed together, but not limited to, by snap-fitting, adhesive bonding, or riveting, to reduce friction caused by movement between the air bladder 2 and wristband 3, thereby reducing the risk of air bladder wear and extending the lifespan of the blood pressure measuring device.

[0056] In addition to the aforementioned structure, smartwatches with blood pressure measurement functions typically also include a photoplethysmograph (PPG) module. The PPG module 104 can be located on the bottom surface of the main body 1, or it can be located in the middle area of ​​the bottom surface of the main body 1 (see [reference]). Figure 1 The circular area in the middle of the bottom surface of the main body 1 (as shown) is designed to improve the detection accuracy of the PPG module 104. Since the PPG module 104 can continuously measure the human heart rate, by simultaneously setting the airbag 2 and the PPG module 104 on the smartwatch, the function of single blood pressure measurement using the airbag 2 can be integrated with the continuous heart rate measurement function of the PPG module 104, and the problem of continuous blood pressure measurement can be solved through precise algorithm calculation.

[0057] You can continue to refer to Figure 1 The smartwatch in this embodiment can also be equipped with an electrocardiogram (ECG) detection module. This ECG detection module 105 can be located on the bottom surface of the main body 1. Alternatively, the ECG detection module 105 can be located in the middle area of ​​the main body 1, and exemplarily, it can be located around the PPG module 104 (see [link to relevant documentation]). Figure 1 The two arc-shaped areas in the middle of the bottom surface of the main body 1 shown in the figure enable the electrocardiogram detection function of the smartwatch.

[0058] Can be referred to together Figure 2 , Figure 2A schematic diagram of the framework structure of a conventional blood pressure measuring device is shown. The main body 1 has a cavity 101. The main functional modules and components of the blood pressure measuring device (such as processors and sensors) are housed within the cavity 101 of the main body 1, for example, an air supply / air release device 4 and a first pressure sensor 5a. One end of an airbag 2 is connected to the air supply / air release device 4 and the first pressure sensor 5a via an air nozzle. The airbag 2 can be worn around the user's wrist. When using this blood pressure measuring device to measure blood pressure, the airbag 2 can be inflated or deflated via the air supply / air release device 4. The first pressure sensor 5a detects the air pressure within the cavity 101 of the main body 1 and the air pressure in the airbag 2 during the inflation / deflation process. Thus, the user's blood pressure value can be obtained through an algorithm based on these two pressure values.

[0059] As explained above regarding the blood pressure measurement process of the blood pressure measuring device, since the air supply and exhaust device 4 is located within the cavity 101 of the main body 1, during the inflation of the airbag 2, the air supply and exhaust device 4 fills the airbag 2 from the cavity 101 of the main body 1. This results in the air pressure inside the cavity 101 of the main body 1 being lower than the atmospheric pressure outside the main body 1, creating a pressure difference between the cavity 101 and the outside of the main body 1. Alternatively, it can be understood as a negative pressure being generated inside the cavity 101 of the main body 1. This negative pressure causes errors in the blood pressure measurement process. Furthermore, the inflation and deflation of the airbag 2 by the air supply and exhaust device 4 causes fluctuations in the air pressure inside the cavity 101 of the main body 1, which also contributes to errors in the blood pressure measurement.

[0060] Based on this, this application provides a blood pressure measuring device to reduce the influence of air pressure within the cavity 101 of the main body 1 of the blood pressure measuring device on its blood pressure measurement, thereby improving the accuracy of blood pressure measurement. For ease of understanding, the specific structure of the blood pressure measuring device will be described in detail in the following embodiments of this application, using a smartwatch as an example.

[0061] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can indicate: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0062] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0063] Reference Figure 3 , Figure 3 This is a schematic diagram of the frame structure of a blood pressure measuring device according to an embodiment of this application. In this embodiment, the blood pressure measuring device may include a main body 1 and an air bladder 2. The main body 1 has multiple sidewalls that are connected to form a cavity 101. The main functional modules and devices of the blood pressure measuring device may be disposed within the cavity 101 of the main body 1. The air bladder 2 may be fixed to one sidewall of the main body 1, and the air bladder 2 has an air chamber.

[0064] You can continue to refer to Figure 3 In this embodiment of the application, the blood pressure measuring device may further include an air supply and exhaust device 4 and a first air pressure sensor 5a, which are disposed within the cavity 101 of the main body 1. The air supply and exhaust device 4 includes an air inlet passage 401 and an air outlet passage 402, both of which are connected to the cavity 101 of the main body 1. Furthermore, the air supply and exhaust device 4 is also connected to the air chamber of the airbag 2 via a first air passage 61. Thus, air within the cavity 101 of the main body 1 can enter the air supply and exhaust device 4 through the air inlet passage 401 and enter the airbag 2 through the first air passage 61, thereby inflating the airbag 2. Conversely, when gas in the airbag 2 needs to be expelled, the air supply and exhaust device 4 extracts gas from the airbag 2 through the first air passage 61 and discharges it into the cavity 101 of the main body 1 through the air outlet passage 402.

[0065] In addition, since the air intake passage 401 and the air exhaust passage 402 of the air supply and exhaust device 4 do not work at the same time, in a possible embodiment of this application, the air intake passage 401 and the air exhaust passage 402 can be combined, that is, only one air passage is provided on the air supply and exhaust device 4. The air supply and exhaust device 4 can inflate the airbag 2 through the air passage and can also extract the gas in the airbag 2 through the air passage, thereby simplifying the structure of the blood pressure measuring device.

[0066] In this application, the specific structure of the air supply and exhaust device 4 is not limited. For example, the air supply and exhaust device 4 can be an air pump, the volume of which can be set according to the air supply and exhaust requirements of the airbag 2 of the blood pressure measuring device and the size of the cavity 101 of the main body 1. Considering that current smartwatches with blood pressure measuring functions have a small main body 1, the space of its cavity 101 is also small; therefore, the volume of the air pump installed in the smartwatch is also small. In some possible embodiments of this application, the air pump can be fixed to a structural component (not shown in the figure), and the air pump can be installed on the main body 1 by fixing the structural component to the main body 1. The material of the structural component can be, but is not limited to, metal or a high-strength non-metal, so that it can reliably support the air pump, thereby improving the structural reliability of the air pump. In this application, the method of fixing the air pump to the structural component is not limited. For example, it can be fixed by adhesive application or threaded connection. In addition, in some embodiments of this application, adhesive can be applied around the air pump to seal it, thereby improving the structural stability of the air pump.

[0067] You can continue to refer to Figure 3 The blood pressure measuring device may also include a drive unit 7, which is electrically connected to the air supply and exhaust device 4. The drive unit 7 can be used to provide driving force for the air supply and exhaust device 4 during the air filling and deflating process. In this application, the drive unit 7 is not specifically limited; for example, it may be a motor, etc.

[0068] When specifically configuring the first pressure sensor 5a, the first pressure sensor 5a can be a differential pressure sensor. Furthermore, the first pressure sensor 5a has a first vent 501 and a second vent 502. The specific positions of the first vent 501 and the second vent 502 on the first pressure sensor 5a are not limited; for example, the first vent 501 and the second vent 502 can be disposed on two opposite end faces of the first pressure sensor 5a. Additionally, the first pressure sensor 5a may also include a pressure diaphragm (not shown in the figure), which is disposed between the first vent 501 and the second vent 502. When the air pressure at the first vent 501 and the second vent 502 is unequal, the pressure diaphragm will deform. The first pressure sensor 5a can determine the air pressure difference between the first vent 501 side and the second vent 502 side based on the magnitude and direction of the deformation of the pressure diaphragm.

[0069] exist Figure 3In the illustrated embodiment, the first air vent 501 of the first pressure sensor 5a is connected to the air cavity of the airbag 2 via the second air passage 62. Additionally, a vent 102a is provided on the side wall of the main body 1, which is connected to the outside atmosphere. The second air vent 502 of the first pressure sensor 5a is connected to the vent 102a via the third air passage 63, thereby achieving communication between the second air vent 502 and the outside atmosphere. In this application, the specific location of the vent 102a is not limited; it can be adjusted according to the structural design of the main body 1 and the specific location of the first pressure sensor 5a. Furthermore, this application does not limit the specific shape of the vent 102a; for example, it can be a regular-shaped hole such as a round hole, an elliptical hole, or a square hole, or it can be some possible irregular-shaped hole.

[0070] Therefore, in this application, the pressure diaphragm of the first pressure sensor 5a has a first vent 501 side corresponding to the air pressure inside the airbag 2, while the pressure diaphragm has a second vent 502 side corresponding to atmospheric pressure. Thus, the first pressure sensor 5a is only used to detect the pressure difference between the air pressure inside the airbag 2 and atmospheric pressure. Since atmospheric pressure is generally considered constant, the blood pressure value measured by the blood pressure measuring device provided in this application is more accurate. Furthermore, because the pressure difference measured by the first pressure sensor 5a is not affected by the air pressure inside the cavity 101 of the main body 1, the accuracy of blood pressure measurement by this device is further improved.

[0071] In the various embodiments of this application, the specific arrangement of each air passage is not limited. It can be arranged in a straight line or in a curved manner, and can be adapted to the internal space of the blood pressure measuring device. It is understood that, for the sake of clarity, each air passage is shown as a straight line in the schematic diagrams of this application.

[0072] Furthermore, considering that airflow fluctuations may occur during the flow of gas in each air passage (e.g., the first air passage 61, the second air passage 62, and the third air passage 63), and that these airflow fluctuations may cause air pressure fluctuations, thus affecting the blood pressure measurement results, the following can be referred to in order to solve this problem. Figure 4a , Figure 4a A schematic diagram of the internal structure of the gas path according to one embodiment of this application is shown. Figure 4a In the embodiment shown, a plurality of protrusions 602 are provided on the inner wall of the air passage duct 601. The plurality of protrusions 602 are spaced apart and alternately arranged along the extension direction of the duct 601 to improve the air pressure fluctuation noise caused by airflow fluctuation, thereby achieving the purpose of improving the accuracy of blood pressure measurement.

[0073] In this application, the specific arrangement of the protrusion 602 is not limited, but its cross-sectional shape can be exemplarily described as follows: Figure 4aThe circle shown can also be Figure 4b The rectangle shown is, or is Figure 4c The triangle and other regular shapes shown are illustrated. In other embodiments of this application, the protrusion 602 may also be some possible irregular shapes, which will not be listed here, but they should all be understood to fall within the protection scope of this application.

[0074] Based on the description in the above embodiments of this application that the first pressure sensor 5a is connected to the vent 102a on the side wall of the main body 1 through the second air passage 62, so that the second air port 502 of the first pressure sensor 5a is connected to the outside atmosphere, in some possible embodiments of this application, the intake air passage 401 and the exhaust air passage 402 of the supply and exhaust device 4 can also be directly connected to the outside atmosphere through the vents opened on the side wall of the main body 1. See also... Figure 5 , Figure 5 A schematic diagram of a blood pressure measuring device according to another embodiment of this application is provided. In this embodiment, the side wall of the main body 1 may also be provided with vent holes 102b and 102c. The air inlet passage 401 of the air supply and exhaust device 4 is connected to the outside atmosphere through vent hole 102b, and the air outlet passage 402 is connected to the outside atmosphere through vent hole 102c. Thus, during operation, the air supply and exhaust device 4 can fill the airbag 2 with air from the outside atmosphere through the air inlet passage 401 and the first air passage 61. Furthermore, when the gas in the airbag 2 needs to be released, the air supply and exhaust device 4 extracts the gas from the airbag 2 through the first air passage 61 and discharges it to the outside atmosphere through the vent passage 402. During this process, the air pressure inside the cavity 101 of the main body 1 is not affected by the operation of the air supply and exhaust device 4 and can be maintained in a stable state. Using the blood pressure measuring device provided in this embodiment, the influence of the air pressure inside the cavity 101 of the main body 1 on the normal operation of the air supply and exhaust device 4 can be avoided, thereby effectively improving the safety and reliability of the blood pressure measuring device.

[0075] To ensure the proper functioning of the air supply and exhaust device 4, in addition to the aforementioned arrangement where both the intake air passage 401 and the exhaust air passage 402 are directly connected to the outside atmosphere through vents on the side wall of the main body 1, this can also be achieved by reducing the negative pressure within the cavity 101 of the main body 1. In this application, reducing the negative pressure within the cavity 101 of the main body 1 refers to reducing the pressure difference between the cavity 101 and the outside atmosphere.

[0076] To reduce the negative pressure within the cavity 101 of the main body 1, conventional blood pressure measuring devices typically have a vent 102d on the side wall of the main body 1, and the vent 102d is not waterproofed. (See also...) Figure 2This allows the air inside the cavity 101 of the main body 1 to be replenished in a timely manner, thereby ensuring the accuracy of blood pressure measurement.

[0077] However, most of the functional modules and components of a blood pressure measuring device are housed within the cavity 101 of the main body 1. Without a waterproof design for the main body 1, these functional modules and components within the cavity 101 are at significant risk of damage, which would affect the lifespan of the blood pressure measuring device. This necessity is even more pronounced for portable electronic devices such as smartwatches or smart bracelets, which are frequently worn and used in various scenarios.

[0078] Based on this, it can be referred to Figure 6 In this embodiment, to reduce the negative pressure inside the cavity 101 of the main body 1, a vent hole 102d can be provided on the side wall of the main body 1. This vent hole 102d can connect the cavity 101 of the main body 1 to the outside atmosphere, allowing for timely replenishment of air to the cavity 101, thereby reducing the negative pressure inside the cavity 101 and ensuring the normal operation of the functional modules and devices within the main body 1. In this application, the specific location of the vent hole 102d is not limited; it can be adjusted according to the structural design of the main body 1. Furthermore, the vent hole 102a and the vent hole 102d can be located on the same side wall of the main body 1 or on different side walls.

[0079] In order to replenish air to the cavity 101 in a timely manner, in some possible embodiments of this application, the diameter of the vent hole 102d can be made relatively large, for example, greater than or equal to 1 mm. In addition, there can be multiple vent holes 102d, which can be arranged in an array, but are not limited to.

[0080] exist Figure 6 In the illustrated embodiment, to ensure good waterproof performance of the entire blood pressure measuring device, a first waterproof and breathable device 8 can be provided at the vent 102d. This first waterproof and breathable device 8 is both waterproof and allows air from the outside atmosphere to pass through and enter the cavity 101 of the main body 1. (Refer to...) Figure 7 , Figure 7A schematic diagram of the structure of a first waterproof and breathable device 8 according to an embodiment of this application is shown. The first waterproof and breathable device 8 may include multiple stacked layers, such as foam 801, a balancing hole steel sheet 802, a polyethylene terephthalate (PET) layer, and a waterproof membrane 804. The balancing hole steel sheet 802 is disposed between the foam 801 and the PET layer 803, and the foam 801 and the PET layer 803 can be bonded and fixed to the balancing hole steel sheet 802 respectively. Because the balancing hole steel sheet 802 has high strength, it can provide support for the entire waterproof and breathable device. In addition, the waterproof membrane 804 can be disposed on the side of the PET layer 803 opposite to the balancing hole steel sheet 802, and the waterproof membrane 804 can be, but is not limited to, bonded and fixed to the PET layer 803 by double-sided adhesive 805. When the waterproof and breathable device is installed on the main body 1, the side of the waterproof membrane 804 of the first waterproof and breathable device 8 that is away from the PET layer 803 can be bonded and fixed to the side wall of the main body 1 by waterproof adhesive 806, and the vent 102d will be covered.

[0081] In addition, to meet the air flow requirements of the blood pressure measuring device during blood pressure measurement, in some embodiments of this application, the air permeability of the first waterproof and breathable device 8 can be set. For example, the air permeability of the first waterproof and breathable device 8 can be greater than or equal to 100 ml / min. In other embodiments of this application, the area of ​​the first waterproof and breathable device 8 can also be adjusted. For example, the area of ​​the first waterproof and breathable device 8 can be greater than 10 mm².

[0082] The blood pressure measuring device provided in this application achieves adequate ventilation by providing a vent 102d. Furthermore, by incorporating a first waterproof and breathable device 8 at the vent 102d, the device gains superior waterproof and breathable performance, enabling its use in scenarios requiring high waterproofing levels and thus expanding its applicability. Moreover, during blood pressure measurement, the pressure difference measured by the first pressure sensor 5a is unaffected by the air pressure within the cavity 101 of the main body 1, resulting in more accurate blood pressure readings.

[0083] As described in the above embodiments, the vent 102a of the blood pressure measuring device provided in this application is only used to connect the second vent 502 of the first pressure sensor 5a to the outside atmosphere. In scenarios where the waterproof requirements for the first pressure sensor 5a are not high, or the first pressure sensor 5a itself has a waterproof structure, or the vent 102a has a small aperture, the vent 102a may not require a waterproof design, thereby simplifying the structure of the blood pressure measuring device. However, in some blood pressure measuring devices with high waterproof requirements, a waterproof and breathable device may be provided at the vent 102a. (Continue to refer to...) Figure 3 In this embodiment, a second waterproof and breathable device 9 is provided at the vent 102a. The second waterproof and breathable device 9 may be the same as or different from the first waterproof and breathable device 8 at the vent 102d. It is not specifically limited in this application.

[0084] It is worth mentioning that, in Figure 5 In the illustrated embodiment, since both the intake air passage 401 and the exhaust air passage 402 of the air supply and exhaust device 4 are directly connected to the outside atmosphere through vents opened on the side wall of the main body 1, therefore, in Figure 5 In the illustrated embodiment, the vent 102d for connecting the cavity 101 to the outside atmosphere may not be provided on the side wall of the main body 1, thus improving the waterproof performance of the blood pressure measuring device. Furthermore, since the vents 102b and 102c are used for the intake and exhaust of the exhaust device 4, their size can be relatively small, eliminating the need for waterproof and breathable devices at these locations. However, in some blood pressure measuring devices with higher waterproof requirements, waterproof and breathable devices may be provided at the vents 102b and 102c. These devices can be configured with reference to the first waterproof and breathable device 8 and the second waterproof and breathable device 9 described above, and will not be elaborated upon here.

[0085] Because in Figure 6 In the illustrated embodiment, the air inside the cavity 101 of the main body 1 is mainly replenished through the vent 102d, and a first waterproof and breathable device 8 is provided at the vent 102d. If the first waterproof and breathable device 8 becomes clogged, its breathability will be greatly reduced, thus affecting the accuracy of the blood pressure measurement. To solve this problem, refer to... Figure 6 Furthermore, a second pressure sensor 5b can be installed inside the cavity 101 of the main body 1 of the blood pressure measuring device. This second pressure sensor 5b is an absolute pressure sensor. Assuming the air pressure inside the cavity 101 of the main body 1 is P1, the air pressure value measured by the second pressure sensor 5b is P1.

[0086] In this application, a first threshold can be set for P1. When the air pressure value P1 measured by the second air pressure sensor 5b is less than the set first threshold, the first waterproof and breathable device 8 is considered to have good breathability. In this embodiment, the value of the first threshold can be set according to the specific application scenario. For example, the first threshold can be set to 95 kPa. Thus, when the air pressure value P1 measured by the second air pressure sensor 5b is higher than 95 kPa, the first waterproof and breathable device 8 is considered to have good breathability.

[0087] In addition, when the air pressure value P1 measured by the second air pressure sensor 5b is lower than the first threshold, it is determined that the first waterproof and breathable device 8 is blocked. At this time, the user can replace or clean the first waterproof and breathable device 8 to ensure the safety of the blood pressure measuring device and the stability of blood pressure measurement.

[0088] It is understood that in this application, the first waterproof and breathable device 8 can be disposed on the outside of the main body 1 or on the inside of the main body 1. In addition, the first waterproof and breathable device 8 can be fixed to the main body 1 by threaded locking or snap-fit, so as to realize the detachable connection between the first waterproof and breathable device 8 and the main body 1, thereby facilitating the replacement and cleaning of the first waterproof and breathable device 8.

[0089] Reference Figure 8 , Figure 8 A schematic diagram of the frame structure of a blood pressure measuring device provided for another possible embodiment of this application. Figure 8 The blood pressure measuring device shown in the embodiment is the same as described above. Figure 6 The main difference in the illustrated embodiments is that: Figure 8 In the illustrated embodiment, the blood pressure measuring device further includes an air passage cavity 10, which is disposed within the cavity 101 of the main body 1. Furthermore, the air passage cavity 10 can be, but is not limited to, fixed to the side wall of the main body 1 facing the cavity 101 by means of adhesive bonding or threaded connection, to improve the structural stability of the air passage cavity 10.

[0090] Based on the aforementioned changes to the structure of the blood pressure measuring device, the connection method between the first pressure sensor 5a, the air supply and exhaust device 4, and the airbag 2 in this embodiment of the application has also been adaptively changed. For specific implementation, please refer to... Figure 8 The air supply and exhaust device 4 is connected to the air passage cavity 10 via the first air passage 61, and the first air port 501 of the first air pressure sensor 5a is connected to the air passage cavity 10 via the second air passage 62. Thus, the first air passage 61 and the second air passage 62 can be connected through the air passage cavity 10. Furthermore, the air passage cavity 10 can be connected to the air chamber of the airbag 2 via the fourth air passage 64. Figure 8Other structures of the blood pressure measuring device in the illustrated embodiment can be configured with reference to any of the above embodiments, and will not be described in detail here.

[0091] Using the blood pressure measuring device provided in this embodiment of the application, by adding an air passage cavity 10, the air intake passage 401 and the air release passage 402 of the air supply and exhaust device 4 can be connected to the air chamber of the airbag 2 through the air passage cavity 10. When the air supply and exhaust device 4 is working, it can draw gas from the cavity 101 of the main body 1 into the air passage cavity 10, and then into the air chamber of the airbag 2. In addition, the air supply and exhaust device 4 can also discharge the gas in the airbag 2 by discharging the gas in the air passage cavity 10 through the air release passage 402.

[0092] Furthermore, after the first pressure sensor 5a is connected to the air supply and exhaust device 4 through the air passage cavity 10, it can be connected to the airbag 2 through only one air passage (the fourth air passage 64). See also... Figure 9 , Figure 9 This application illustrates one possible embodiment of the same principle. Figure 8 A schematic diagram of the main body 1 of the corresponding blood pressure measuring device. (From...) Figure 9 It can be seen that only one connection hole 103 for connecting to the air bladder 2 can be opened on the side wall of the main body 1 of the blood pressure measuring device. Additionally, referring to... Figure 10 , Figure 10 This application illustrates one possible embodiment of the same principle. Figure 8 A schematic diagram of the structure of the airbag 2 in the corresponding blood pressure measuring device. In this embodiment, the airbag 2 may be provided with an air nozzle 201, which can be inserted into the aforementioned... Figure 9 The main body 1 shown has an opening, which enables the single-nozzle connection between the airbag 2 and the main body 1. This effectively reduces the number of connection holes 103 in the entire blood pressure measuring device, thereby improving the overall sealing of the blood pressure measuring device. It also reduces the risk of damage to functional modules and components inside the cavity 101 of the main body 1 of the blood pressure measuring device, thus helping to extend the service life of the blood pressure measuring device.

[0093] Furthermore, in this embodiment, the specific structure of the air nozzle 201 of the airbag 2 is not limited; for example, refer to Figure 11 , Figure 11This illustration shows a schematic diagram of the air nozzle 201 of an airbag 2 according to a possible embodiment of this application. The air nozzle 201 protrudes from one side surface of the airbag 2 in the direction towards the main body 1. A snap-fit ​​structure 2011 may be provided on the air nozzle 201. This snap-fit ​​structure 2011 may be, but is not limited to, an annular protrusion protruding from the surface of the air nozzle 201. Thus, when the air nozzle 201 is inserted into the connection hole 103, the air nozzle 201 can be secured to the connection hole 103 of the main body 1 through the snap-fit ​​structure 2011. Furthermore, with proper design, the snap-fit ​​structure 2011 can also serve a waterproof sealing function. In some possible embodiments of this application, the air nozzle 201 may be located on the main body 1, while the connection hole 103 may be located on the airbag 2. In this case, the connection between the main body 1 and the airbag 2 can also be achieved by inserting the air nozzle into the connection hole 103.

[0094] It is understandable that when the airbag 2 and the main body 1 are connected by a single air nozzle, the air passage cavity 10 can be connected to the air nozzle 201 of the airbag 2 through the fourth air passage 64, thereby realizing the connection between the air passage cavity 10 and the air chamber of the airbag 2.

[0095] It is worth mentioning that, Figure 8 Other structures of the blood pressure measuring device shown can be configured with reference to any of the above embodiments, for example, in Figure 8 When the blood pressure measuring device shown has a vent 102b and a first waterproof and breathable device 8 on the side wall of the main body 1, it can also be used in... Figure 8 A second air pressure sensor 5b is installed inside the cavity 101 of the blood pressure measuring device shown, to detect the air permeability of the first waterproof and breathable device. Alternatively, protrusions can be provided in the pipes of the first air passage 61, the second air passage 62, and the third air passage 63 to... Figure 13 The specific configuration of other structures of the blood pressure measuring device shown will not be elaborated here.

[0096] In some embodiments of this application, to ensure the safety of the blood pressure measuring device, an air valve 11 may be provided in the blood pressure measuring device. This air valve 11 can be connected to the air supply and exhaust device 4, serving as a backup vent for the air supply and exhaust device 4. In specific implementations, refer to... Figure 12 , Figure 12 This is a schematic diagram of the frame structure of a blood pressure measuring device according to another possible embodiment of this application. By... Figure 12 The blood pressure measuring device shown is Figure 8 A comparison of the blood pressure measuring devices shown reveals that the main differences between the two embodiments are: Figure 12The blood pressure measuring device in the illustrated embodiment is also provided with an air valve 11, which includes two air ports, which can be defined as a first air port 1101 and a second air port 1102, respectively. The first air port 1101 can be connected to the air passage cavity 10 through a fifth air passage 65, and the second air port 1102 can be connected to the cavity 101 of the main body 1 through a sixth air passage 66.

[0097] Furthermore, as can be seen from the above description of the air intake passage 401 and air exhaust passage 402 of the air supply and exhaust device 4 being directly connected to the outside atmosphere through the vent holes on the side wall of the main body 1, in some embodiments of this application, the second air port 1102 of the air valve 11 can also be directly connected to the outside atmosphere through the sixth air passage 66 and the vent holes opened on the side wall of the main body 1, so as to reduce the impact of the operation of the air valve 11 on the air pressure inside the cavity 101 of the main body 1.

[0098] In this embodiment of the application, since the venting air passage 402 of the air supply and exhaust device 4 is connected to the air passage cavity 10, the air valve 11 can be connected to the venting air passage 402 of the air supply and exhaust device 4. Thus, in the event of a malfunction or blockage of the venting air passage 402 of the air supply and exhaust device 4, the air passage cavity 10 can be vented by opening the air valve 11, thereby preventing damage to the air supply and exhaust device 4, the first pressure sensor 5a, or the airbag 2, and ensuring the safety of the blood pressure measuring device during blood pressure measurement.

[0099] In this application, the specific configuration of the air valve 11 is not limited. For example, the air valve 11 can be a solenoid valve. This allows for the programming of the opening and closing of the air valve 11 as needed, thereby simplifying the operation of the blood pressure measuring device and improving the user experience. For instance, in one possible embodiment of this application, the air valve 11 can be configured such that when the air pressure in the air passage cavity 10 is greater than a certain value (e.g., 300 mmHg), the air valve 11 is electrically opened to release air; and when the air pressure in the air passage cavity 10 drops to a certain value (e.g., 10 mmHg) or below, the air valve 11 is closed. This allows the air valve 11 to adaptively open or close according to the air pressure in the air passage cavity 10, thereby maintaining the air pressure in the entire air passage system at a relatively stable state and improving the reliability of the blood pressure measuring device.

[0100] As can be seen from the above description of the air valve 11 in the embodiments, the safety performance of the blood pressure measuring device can be effectively improved by setting the air valve 11. Based on this, in some possible embodiments of this application, the air valve 11 can also be set on the air circuit of the blood pressure measuring device (e.g., the first air circuit 61, the third air circuit 63, or the fourth air circuit 64, etc.) to control the opening and closing of the corresponding air circuit, thereby realizing flexible control of the gas flow state in the air circuit, and further improving the reliability of the blood pressure measuring device.

[0101] It is worth mentioning that, Figure 12 Other structures of the blood pressure measuring device shown can be configured with reference to any of the above embodiments, for example, in Figure 12 When the main body 1 of the blood pressure measuring device shown is provided with a vent 102d and a first waterproof and ventilated device 8 on its side wall, it can also be used in... Figure 12 A second air pressure sensor 5b is installed inside the cavity 101 of the blood pressure measuring device shown, to detect the air permeability of the first waterproof and breathable device. Alternatively, protrusions can be provided in the pipes of the first air passage 61, the second air passage 62, the third air passage 63, and the fourth air passage 64 to... Figure 12 The specific configuration of other structures of the blood pressure measuring device shown will not be elaborated here.

[0102] In addition, in this application, to improve the accuracy of blood pressure measurement, a calibration device can be added to the first pressure sensor 5a to calibrate the air pressure value inside the air chamber of the airbag 2 measured by the first pressure sensor 5a. For specific implementation, refer to... Figure 13 , Figure 13 This is a schematic diagram of the frame structure of a blood pressure measuring device provided in another possible embodiment of this application. In this embodiment, a third pressure sensor 5c is added to the blood pressure measuring device. In this embodiment, the third pressure sensor 5c can also be a differential pressure sensor. The third pressure sensor 5c includes a third air hole 503 and a fourth air hole 504. The third air hole 503 can be connected to the air passage cavity 10 through a seventh air passage 67 to realize the communication between the third air hole 503 and the air cavity of the airbag 2. In addition, a vent hole 102e is provided on the side wall of the main body 1, and the fourth air hole 504 of the third pressure sensor 5c is connected to the outside atmosphere through an eighth air passage 68. In this application, the specific location of the vent hole 102e is not limited, and it can be adjusted according to the structural design of the main body 1 and the specific location of the third pressure sensor 5c. Additionally, it is understood that a third waterproof and breathable device 12 may be provided at the vent 102e. This third waterproof and breathable device 12 may be provided with reference to the description of the first waterproof and breathable device 8 at the vent 102d in any of the above embodiments, and will not be described in detail here.

[0103] As can be understood from the above description of the specific configuration of the third pressure sensor 5c, both the third pressure sensor 5c and the first pressure sensor 5a measure the pressure difference between the air passage cavity 10 and the external atmosphere. Based on this, the accuracy of the measurement by the first pressure sensor 5a can be determined by comparing the pressure difference measured by the first pressure sensor 5a with that measured by the third pressure sensor 5c. The determination process can be, for example, as follows: when the difference between the pressure difference measured by the first pressure sensor 5a and that measured by the third pressure sensor 5c is within a first threshold range, the pressure difference measured by the first pressure sensor 5a is determined to be accurate, and the blood pressure measuring device calculates the corresponding blood pressure value based on this pressure difference. In this application, the first threshold range can be set according to the specific application scenario; for example, it can be -200 Pa to 200 Pa.

[0104] Furthermore, if the difference between the pressure difference measured by the first pressure sensor 5a and the pressure difference measured by the third pressure sensor 5c is outside the first threshold range, it is determined that the pressure difference measured by the first pressure sensor 5a is inaccurate. In this case, the pressure difference data measured by the first pressure sensor is discarded, and the next measurement is performed until the difference between the pressure difference measured by the first pressure sensor 5a and the pressure difference measured by the third pressure sensor 5c falls into the first threshold range, and the blood pressure measuring device calculates the corresponding blood pressure value based on the pressure difference.

[0105] It is worth mentioning that, Figure 13 Other structures of the blood pressure measuring device shown in the embodiment can be configured with reference to any of the above embodiments, for example, in Figure 13 When the main body 1 of the blood pressure measuring device shown is provided with a vent 102d and a first waterproof and ventilated device 8 on its side wall, it can also be used in... Figure 13 A second air pressure sensor 5b is installed inside the cavity 101 of the blood pressure measuring device shown, to detect the air permeability of the first waterproof and breathable device 8. Alternatively, protrusions can be provided in the pipes of the first air passage 61, second air passage 62, third air passage 63, fourth air passage 64, fifth air passage 65, sixth air passage 66, seventh air passage 67, and eighth air passage 68. Alternatively, when the blood pressure measuring device does not have an air passage cavity 10, the third air port 503 of the third air pressure sensor 5c can be directly connected to the air cavity of the airbag 2 through the seventh air passage 67. Figure 13 The specific configuration of other structures of the blood pressure measuring device shown will not be elaborated here.

[0106] The blood pressure measuring device of this embodiment of the application can effectively improve the accuracy of blood pressure measurement by adding a third pressure sensor 5c to calibrate the pressure difference measured by the first pressure sensor 5a.

[0107] In this application, the third pressure sensor 5c can, in addition to employing, such as Figure 13 In addition to the differential pressure type pressure sensor shown, an absolute pressure type pressure sensor can also be used. For specific implementation, please refer to... Figure 14 , Figure 14 A schematic diagram of the frame structure of a blood pressure measuring device according to another possible embodiment of this application is shown. In this embodiment, the third air pressure sensor 5c has only one third air port, which is connected to the air passage cavity 10 through the seventh air passage 67.

[0108] exist Figure 14 In the illustrated embodiment, the air pressure inside the airbag 2 measured by the absolute pressure type third pressure sensor 5c can be used to calibrate the air pressure inside the air chamber of the airbag 2 measured by the first pressure sensor 5a. The calibration method can be, for example, that when the difference between the air pressure inside the air chamber of the airbag 2 measured by the first pressure sensor 5a and the air pressure inside the air chamber of the airbag 2 measured by the third pressure sensor 5c is within a first threshold range, the air pressure inside the air chamber of the airbag 2 measured by the first pressure sensor 5a is determined to be accurate, and the blood pressure measuring device calculates the corresponding blood pressure value based on this air pressure. In this application, the first threshold range can be set according to the specific application scenario; for example, it can be -200 Pa to 200 Pa.

[0109] Furthermore, if the difference between the air pressure in the air chamber of the airbag 2 measured by the first air pressure sensor 5a and the air pressure in the air chamber of the airbag 2 measured by the third air pressure sensor 5c is outside the first threshold range, it is determined that the air pressure in the air chamber of the airbag 2 measured by the first air pressure sensor is inaccurate. In this case, the air pressure data measured by the first air pressure sensor 5a is discarded, and the next measurement is performed until the difference between the air pressure in the air chamber of the airbag 2 measured by the first air pressure sensor 5a and the air pressure in the air chamber of the airbag 2 measured by the third air pressure sensor 5c falls into the first threshold range, and the blood pressure measuring device calculates the corresponding blood pressure value based on the air pressure.

[0110] As can be seen from the above description of the working principle of the first air pressure sensor 5a, the air pressure difference measured by the first air pressure sensor 5a is directly determined by the external atmospheric pressure and the air pressure inside the air chamber of the airbag 2. We usually consider the external atmospheric pressure to be a constant value. Therefore, the air pressure value inside the air chamber of the airbag 2 can be directly obtained by measuring the pressure difference and the external atmospheric pressure through the first air pressure sensor 5a.

[0111] It is worth mentioning that, Figure 14 Other structures of the blood pressure measuring device shown in the embodiment can be configured with reference to any of the above embodiments, for example, in Figure 14When the main body 1 of the blood pressure measuring device shown is provided with a vent 102d and a first waterproof and ventilated device 8 on its side wall, it can also be used in... Figure 14 A second air pressure sensor 5b is installed inside the cavity 101 of the blood pressure measuring device shown, to detect the air permeability of the first waterproof and breathable device 8. Alternatively, protrusions can be provided in the pipes of the first air passage 61, second air passage 62, third air passage 63, fourth air passage 64, fifth air passage 65, sixth air passage 66, and seventh air passage 67. Alternatively, when the blood pressure measuring device does not have an air passage cavity 10, the third air port of the third air pressure sensor 5c can be directly connected to the air cavity of the airbag 2 through the seventh air passage 67. Figure 14 The specific configuration of other structures of the blood pressure measuring device shown will not be elaborated here.

[0112] The blood pressure measuring device of this embodiment of the application, by adding a third pressure sensor 5c to calibrate the measurement result of the first pressure sensor 5a, can effectively improve the accuracy of blood pressure measurement.

[0113] Reference Figure 15 , Figure 15 This is a schematic diagram of a blood pressure measuring device according to another embodiment of this application. The structure of the blood pressure measuring device in this embodiment differs from any of the above embodiments, primarily in that: the first pressure sensor 5a is disposed inside the cavity 101 of the main body 1, and no vent hole 102a is provided on the side wall of the main body 1; however, the second air hole 502 of the first pressure sensor 5a is connected to the cavity 101 of the main body 1. Therefore, in this embodiment, the pressure difference measured by the first pressure sensor 5a is determined by the air pressure inside the cavity 101 of the main body 1 and the air pressure inside the air chamber of the airbag 2.

[0114] To reduce the impact of pressure changes within the cavity 101 of the main body 1 on the accuracy of the pressure difference measured by the first pressure sensor 5a, it is possible to continue referring to... Figure 15 A second pressure sensor 5b, which is an absolute pressure sensor, can also be disposed within the cavity 101 of the main body 1. This second pressure sensor 5b is positioned close to the first pressure sensor 5a. The second pressure sensor 5b has only one fifth air hole 505, which is positioned opposite to the second air hole 502 of the first pressure sensor 5a. In one possible embodiment, the fifth air hole 505 and the second air hole 502 can be coaxially arranged, and the distance between the fifth air hole 505 and the second air hole 502 is less than or equal to 1 mm.

[0115] Since the second air pressure sensor 5b includes only one fifth air port 505, it can measure the air pressure inside the cavity 101 of the main body 1. Furthermore, since the distance between the fifth air port 505 and the second air port 502 is small, the air pressure measured on the side of the fifth air port 505 can be considered equal to the air pressure measured on the side of the second air port 502.

[0116] In adopting this application Figure 15 When the blood pressure measuring device shown performs blood pressure measurement, air is pumped into the air chamber of the airbag 2 through the air supply and exhaust device 4. This creates a low-pressure space within the air chamber 101 of the main body 1, lower than atmospheric pressure. Assuming the air pressure within the air chamber 101 of the main body 1 is P1 (the absolute pressure sensor reading), the external atmospheric pressure is P0, and the air pressure within the air chamber of the airbag 2 is P, it can be understood that this pressure P is the differential pressure value within the air chamber of the airbag 2, and its absolute pressure value is P + P0. The relationship between these pressure values ​​is as follows: the reading of the first pressure sensor 5a: P2 = P + P0 - P1; therefore, the actual air pressure within the airbag 2 is: P = P2 - ΔP (ΔP = P0 - P1), then P = P2 - (P0 - P1).

[0117] It is understood that, in this embodiment of the application, although the air pressure inside the main body 1 is low, by setting a second air pressure sensor 5b inside the cavity 101 of the main body 1, the difference between the external atmospheric pressure P0 and the air pressure value measured by the second air pressure sensor 5b can be used as the error value for calculating the air pressure inside the air chamber of the airbag 2, and the true air pressure value inside the airbag 2 can be obtained. This effectively improves the accuracy of blood pressure measurement in the blood pressure measuring device.

[0118] In addition, in this embodiment of the application, a first waterproof and breathable device 8 can be provided at the vent 102d of the blood pressure measuring device. In this way, while achieving waterproofing of the whole device, the accuracy of the blood pressure value measured by the blood pressure measuring device can also be guaranteed.

[0119] Furthermore, since the second pressure sensor 5b is located within the cavity 101 of the main body 1, and the second pressure sensor 5b is an absolute pressure sensor, it can be understood from the above description of detecting the degree of blockage of the first waterproof and breathable device 8 by setting the second pressure sensor 5b that, in this application... Figure 15In the illustrated embodiment, the degree of blockage of the first waterproof and breathable device 8 can also be determined based on the pressure value P1 measured by the second pressure sensor 5b during blood pressure measurement. Specifically, a first threshold can be set for P1. When the pressure value P1 measured by the second pressure sensor 5b is higher than this first threshold, the breathability of the first waterproof and breathable device 8 is considered good. And / or, when the pressure value P1 measured by the second pressure sensor 5b is lower than the first threshold, the breathability of the first waterproof and breathable device 8 is considered poor. In this case, the user can replace or clean the first waterproof and breathable device 8 to ensure the safety of the blood pressure measuring device and the stability of blood pressure measurement, thereby making the blood pressure value measured by the blood pressure measuring device more accurate.

[0120] In this application, the first waterproof and breathable device 8 can be disposed on the outside of the main body 1 or on the inside of the main body 1. In addition, the first waterproof and breathable device 8 can be fixed to the main body 1 by threaded locking or snap-fit, so as to realize the detachable connection between the first waterproof and breathable device 8 and the main body 1, thereby facilitating the replacement and cleaning of the first waterproof and breathable device 8.

[0121] It is worth mentioning that, Figure 15 Other structures of the blood pressure measuring device in the illustrated embodiment can be configured with reference to any of the above embodiments. For example, an air passage cavity 10 can be provided in the blood pressure measuring device so that the air supply and exhaust device 4 is connected to the air passage cavity 10 through the first air passage 61, the first air port 501 of the first air pressure sensor 5a is connected to the air passage cavity 10 through the second air passage 62, and the air passage cavity 10 is connected to the airbag 2 through the fourth air passage 64, so as to realize the connection of a single air nozzle between the main body 1 and the airbag 2. For Figure 15 The specific configuration of other structures of the blood pressure measuring device shown will not be elaborated here.

[0122] When using the blood pressure measuring device provided in this application, the influence of the air pressure inside the cavity 101 of the main body 1 of the blood pressure measuring device on the measurement value of the first air pressure sensor 5a can be effectively reduced, thereby making the blood pressure measurement result more accurate. In addition, the main body 1 of the blood pressure measuring device can be equipped with a first waterproof and breathable device 8 to achieve a waterproof design. Furthermore, the second air pressure sensor 5b can be used to detect the breathability of the first waterproof and breathable device 8, so as to avoid the blockage of the first waterproof and breathable device 8 affecting the measurement result of the blood pressure measuring device.

[0123] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A blood pressure measuring device, characterized in that, Includes the main body, air supply and exhaust device, and first air pressure sensor, wherein: The main body includes a cavity; the air supply and exhaust device and the first air pressure sensor are disposed in the cavity; The main body includes an end portion for connecting an airbag; The air supply and exhaust device includes an air inlet passage and an air outlet passage. The air supply and exhaust device is used to connect with the air chamber of the airbag through a first air passage. Both the air inlet passage and the air outlet passage are connected to the chamber. The first air pressure sensor includes a first air hole and a second air hole; the main body has a first vent hole, the first air hole is used to connect with the air cavity of the airbag through a second air passage, the second air hole is connected with the first vent hole through a third air passage, so that the first air pressure sensor is connected to the outside atmosphere through the first vent hole; wherein, the third air passage includes a pipe, one end of the pipe is connected to the second air hole, and the other end of the pipe is connected to the first vent hole.

2. The blood pressure measuring device as described in claim 1, characterized in that, The main body is also provided with a second vent hole, and a first waterproof and breathable device is provided at the second vent hole.

3. The blood pressure measuring device as described in claim 2, characterized in that, The second vent and the first vent are located on the same side wall or different side walls of the main body.

4. The blood pressure measuring device as described in claim 2, characterized in that, The first waterproof and breathable device includes multiple stacked layers.

5. The blood pressure measuring device as described in claim 4, characterized in that, The multiple stacked layers include foam, a steel sheet with balance holes, a polyethylene terephthalate layer, and a waterproof membrane.

6. The blood pressure measuring device as described in claim 2, characterized in that, The air permeability of the first waterproof and breathable device is greater than or equal to 100 ml / min.

7. The blood pressure measuring device according to any one of claims 1 to 6, characterized in that, The first pressure sensor is a differential pressure sensor.

8. The blood pressure measuring device according to any one of claims 1 to 6, characterized in that, The first pressure sensor further includes a pressure diaphragm disposed between the first air hole and the second air hole.

9. The blood pressure measuring device according to any one of claims 2 to 6, characterized in that, The blood pressure measuring device further includes a second air pressure sensor, which is disposed in the cavity of the main body. The blood pressure measuring device also determines the air permeability of the first waterproof and breathable device based on the air pressure value measured by the second air pressure sensor.

10. The blood pressure measuring device as described in claim 9, characterized in that, The second pressure sensor is an absolute pressure sensor; When the air pressure value measured by the second air pressure sensor is higher than the first threshold, it is determined that the first waterproof and breathable device has good air permeability. And / or, when the air pressure value measured by the second air pressure sensor is lower than the first threshold, it is determined that the first waterproof and breathable device is blocked.

11. The blood pressure measuring device as described in claim 1, characterized in that, The blood pressure measuring device further includes an air passage cavity, which is disposed within the cavity of the main body; The air supply and exhaust device is connected to the air passage cavity through the first air passage, and the first air hole of the first air pressure sensor is connected to the air passage cavity through the second air passage; the air passage cavity is connected to the air chamber of the airbag through the fourth air passage.

12. The blood pressure measuring device as described in claim 11, characterized in that, The gas passage cavity is fixed to the main body by adhesive bonding or threaded connection.

13. The blood pressure measuring device as described in claim 11 or 12, characterized in that, The blood pressure measuring device also includes an air valve, which includes a first air port and a second air port. The first air port is connected to the air passage cavity through a fifth air passage, and the second air port is connected to the cavity of the main body through a sixth air passage.

14. The blood pressure measuring device as described in claim 11 or 12, characterized in that, The blood pressure measuring device also includes a third air pressure sensor, which includes a third air port and a fourth air port; the main body also has a third vent hole, which is connected to the air passage cavity through a seventh air passage, and the fourth air port is connected to the third vent hole through an eighth air passage.

15. The blood pressure measuring device as described in claim 14, characterized in that, When the difference between the pressure difference measured by the first pressure sensor and the pressure difference measured by the third pressure sensor is within a first threshold range, it is determined that the pressure difference measured by the first pressure sensor is accurate. And / or, if the difference between the pressure difference measured by the first pressure sensor and the pressure difference measured by the third pressure sensor is outside the first threshold range, then the pressure difference measured by the first pressure sensor is determined to be inaccurate.

16. The blood pressure measuring device as described in claim 11 or 12, characterized in that, The blood pressure measuring device also includes a third pressure sensor, which is an absolute pressure sensor; the third pressure sensor includes a third air port, which is connected to the air passage cavity through a seventh air passage.

17. The blood pressure measuring device as described in claim 16, characterized in that, When the difference between the air pressure inside the airbag measured by the first air pressure sensor and the air pressure inside the airbag measured by the third air pressure sensor is within a first threshold range, it is determined that the air pressure inside the airbag measured by the first air pressure sensor is accurate. And / or, when the difference between the air pressure inside the airbag measured by the first air pressure sensor and the air pressure inside the airbag measured by the third air pressure sensor is outside the first threshold range, it is determined that the air pressure inside the airbag measured by the first air pressure sensor is inaccurate.

18. The blood pressure measuring device according to any one of claims 1 to 6, 11, characterized in that, A second waterproof and breathable device is also provided at the first vent.

19. The blood pressure measuring device according to any one of claims 1 to 6, 11, characterized in that, The inner wall of the first, second, or third air passage is provided with a plurality of protrusions, which are spaced apart and alternately arranged along the extension direction of the passage.

20. The blood pressure measuring device according to any one of claims 1 to 6, 11, characterized in that, The blood pressure measuring device also includes the airbag, which is detachably connected to the main body.

21. The blood pressure measuring device as described in claim 20, characterized in that, The main body has a connection hole at one end, and the airbag has an air nozzle that protrudes from one side surface of the airbag toward the main body. The air nozzle is inserted into the connection hole, and the fourth air passage is connected to the air nozzle.

22. The blood pressure measuring device as described in claim 21, characterized in that, The connection hole is located on the bottom surface of the main body.

23. The blood pressure measuring device as described in claim 21 or 22, characterized in that, The air nozzle is provided with a snap-fit ​​structure, which is used to snap the air nozzle into the connection hole.

24. The blood pressure measuring device as described in claim 20, characterized in that, The blood pressure measuring device further includes a wristband, with the airbag located on the side of the wristband facing the user's wrist; and / or, the airbag located on the surface of the body facing the user's wrist.

25. The blood pressure measuring device as described in claim 24, characterized in that, The wristband is fixed to the airbag by one or more of the following methods: snap-fit, adhesive, or riveting.

26. The blood pressure measuring device according to any one of claims 1 to 6, 11, characterized in that, The blood pressure measuring device further includes a photoplethysmography (PPG) module and / or an ECG detection module, wherein the PPG module and the ECG detection module are disposed on the bottom surface of the main body.

27. The blood pressure measuring device according to any one of claims 1 to 6, 11, characterized in that, The blood pressure measuring device is a watch or a wristband.

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