Pulse wave sphygmomanometer

Abstract

According to the pulse wave sphygmomanometer provided by the utility model, more than two pressure sensors with different measuring ranges are arranged in the sphygmomanometer host, so that the sphygmomanometer can have better signals at any pressurizing section. The pulse wave sphygmomanometer comprises a main machine, a pressure module arranged in the main machine, a bandage connected with the main machine and an air bag arranged on the bandage. The air bag is arranged on the surface of the side, facing the measured object, of the bandage, extends towards the main machine and is communicated with a pressure module arranged in the main machine so as to carry out pressure transmission; the air pump assembly is used for inflating the air bag; and more than two pressure sensors with different measuring ranges are arranged in the pressure module.

Description

Technical Field

[0001] The utility model relates to a sphygmomanometer, in particular to a pulse wave sphygmomanometer, and belongs to the technical field of mechanical sensor measurement. Background Art

[0002] Nowadays, people pay more and more attention to the health of themselves and their families, and blood pressure measurement is particularly important.

[0003] At present, the mainstream home electronic blood pressure monitors on the market are wrist electronic blood pressure monitors, that is, blood pressure watches. Blood pressure watches are miniaturized wearable blood pressure measuring devices. Blood pressure watches generally include a strap and an air bag arranged on the strap. The pressure sensor is used to collect the pressure signal in the air bag. The air bag is used to block the blood vessels. During the inflation or deflation process, the pressure oscillation wave is collected. The blood pressure is calculated by the envelope curve of the amplitude change of the pressure oscillation wave, which is the oscillometric blood pressure measurement. Conventional blood pressure watches are only equipped with one pressure sensor or multiple array-type pressure sensors with the same range.

[0004] Since the pressure of blocking blood vessels is relatively large, the pressure sensor has a relatively large range requirement, but the sensitivity of a sensor with a large range is relatively low; the human pulse wave is a relatively weak signal. When the airbag is pressurized to a large extent, the skin tissue has been compacted, and the pulse wave signal is relatively strong. In this way, a sensor with a large range can still receive the signal even though it has a low sensitivity. However, when the airbag is pressurized to a small extent, the pulse wave signal is relatively weak because the skin tissue still has a buffer. At this time, a sensor with a large range will find it difficult to obtain a good signal.

[0005] There are two methods for measuring blood pressure, from the perspective of collection method: oscillometric method and pulse wave method. Setting up a pressure sensor or multiple array-type pressure sensors with the same range can only be used in scenarios with high pressure, that is, the oscillometric method of measuring blood pressure. Utility Model Content

[0006] In view of this, the utility model provides a pulse wave sphygmomanometer. By arranging two or more pressure sensors with different ranges in the sphygmomanometer main unit, the sphygmomanometer can have a better signal in any pressurization section (i.e., when the air bag is pressurized to a greater extent, a pressure sensor with a larger range is used, and when the air bag is pressurized to a smaller extent, a pressure sensor with a smaller range is used).

[0007] A pulse wave sphygmomanometer, comprising: a host, a pressure module arranged inside the host, a bandage connected to the host, and an air bag arranged on the bandage;

[0008] The airbag is arranged on the surface of the bandage facing the object to be tested, and the airbag extends toward the host and is connected to the pressure module arranged inside the host to transmit pressure; the air pump assembly is used to inflate the airbag;

[0009] The pressure module is provided with more than two pressure sensors with different measuring ranges.

[0010] As a preferred embodiment of the present invention, the air pump assembly is arranged inside the main machine.

[0011] As a preferred embodiment of the present invention, it further comprises a photoelectric module, wherein the photoelectric module is arranged on a surface of the mainframe facing the object to be measured or on a surface of the airbag facing the object to be measured.

[0012] As a preferred embodiment of the present invention, the pressure module and the air pump assembly are integrated inside the host;

[0013] The air pump assembly includes: an air pump, an air pump bracket and an airway seal; the pressure module also includes a control panel;

[0014] The air pump is mounted on an air pump bracket, and an air passage connected to an air outlet of the air pump is arranged on the air pump bracket, and the air passage has an air passage branch for arranging a detection end of the pressure sensor;

[0015] The airway seal is mounted on the air pump bracket and is used to seal the airway and the airway branch;

[0016] The airway seal is provided with an air hole A communicating with the airway and an air hole B communicating with the airway branch and corresponding to the pressure sensor one by one; the airbag is communicated with the airway through the air hole A; the detection end of the pressure sensor is installed in the corresponding air hole B;

[0017] The control board is mounted on the air pump bracket and is electrically connected to the pressure sensor.

[0018] As a preferred embodiment of the utility model, more than two pressure sensors are welded on a flexible circuit board, and one end of the flexible circuit board used to install the pressure sensor is divided into branches corresponding to the pressure sensors one by one, and each branch is installed with a pressure sensor; the flexible circuit board is installed on the air pump bracket.

[0019] As a preferred embodiment of the present invention, a thin film pressure sensor is arranged on the surface of the airbag facing the object to be measured.

[0020] As a preferred embodiment of the utility model, the thin film pressure sensor is carried on a flexible board, and the head of the flexible board is located inside the host after extending from the airbag to the connection between the flexible board and the host, and is electrically connected to the pressure module inside the host.

[0021] As a preferred embodiment of the utility model, the airbag is a multi-layer structure, and the layer connected to the air pump assembly through the air nozzle is the first layer of the airbag; the first layer of the airbag is in contact with the object to be measured, and the thin film pressure sensor is arranged on the surface of the first layer of the airbag; the airbag fixing buckle is arranged on the last layer of the airbag and buckled with the bandage.

[0022] As a preferred embodiment of the present invention, the photoelectric module comprises: a housing, a lens, a photosensitive receiver and a light emitting diode group;

[0023] The housing serves as a mounting base for the lens and provides mounting space for the photosensitive receiver and the light emitting diode group;

[0024] The light emitting diode group includes two light emitting diodes A and one light emitting diode B;

[0025] Two independent light emitting diodes A are arranged side by side at the center of the shell, and a photosensitive receiver is arranged at an equal distance above, on the left and on the right of the two light emitting diodes A; and a light emitting diode B is arranged below the two light emitting diodes A.

[0026] As a preferred embodiment of the utility model, the host is a watch body, and the bandage is a watch strap; the watch strap is connected to the watch body to form a blood pressure measuring watch.

[0027] Beneficial effects:

[0028] (1) In the present invention, by arranging two or more pressure sensors with different ranges in the main unit, the sphygmomanometer can have a good signal in any pressurization section; when the airbag is pressurized to a large extent, a pressure sensor with a larger range is used, and when the airbag is pressurized to a small extent, a pressure sensor with a smaller range is used to capture weak signals.

[0029] Setting up more than two pressure sensors with different ranges at the same time can be compatible with two methods of measuring blood pressure, that is, the pulse wave sphygmomanometer can measure blood pressure by both oscillometric method and pulse wave method: when measuring blood pressure by oscillometric method, a pressure sensor with a larger range is used; for measuring pulse wave without or slightly sensitive pressurization and then measuring blood pressure by pulse wave, that is, pulse wave method, a pressure sensor with a smaller range is used.

[0030] (2) In the present invention, a photoelectric module is further provided, thereby forming a two-in-one PPG and pressure pulse wave sphygmomanometer; the photoelectric module is provided on the surface of the main unit facing the object to be measured or on the surface of the air bag facing the object to be measured. When collecting the pressure signal, the bandage is tightened due to the inflation of the air bag, so that the PPG can be better attached to the skin and the PPG can be prevented from being affected by ambient light; at the same time, the appropriate air pressure prevents the blood in the capillaries from being driven away, resulting in a deterioration of the PPG signal.

[0031] (3) In the present invention, the pressure module and the air pump assembly are integrated inside the main unit, and the flexible circuit board used to install the pressure sensor adopts a bifurcated structure to ensure that the pressure sensors do not affect each other.

[0032] (4) In the present invention, a thin film pressure sensor is provided on the surface of the airbag facing the object to be measured, which can be used to sense the tightness of the bandage.

[0033] (5) In the utility model, when the airbag adopts a multi-layer structure, the layer connected to the air nozzle, i.e., the first layer of the airbag, is in contact with the object to be measured, and the thin film pressure sensor is arranged on the surface of the first layer of the airbag, and the airbag fixing buckle is arranged on the last layer of the airbag and buckled with the bandage; thereby avoiding the stretching of the thin film pressure sensor during the inflation of the airbag.

[0034] (6) The layout of the optoelectronic modules in the present invention can improve the accuracy of the PPG signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a schematic diagram of the overall structure of a pulse wave blood pressure monitor for wrist use;

[0036] Figure 2 This is the general assembly drawing of the pressure module (without the pressure sensor cover);

[0037] Figure 3 This is the exploded view of the pressure module;

[0038] Figure 4 is a schematic diagram of the arrangement of two pressure sensors;

[0039] Figure 5 It is a schematic diagram of the structure of a forward-mounted airbag in the prior art;

[0040] Figure 6 This is a schematic diagram of the structure of the airbag installed in reverse in the utility model;

[0041] Figure 7 A schematic diagram of the structure of adding a thin film pressure sensor to the airbag;

[0042] Figure 8 Schematic diagram of the structure of the photovoltaic module.

[0043] Among them: 1-pressure module, 2-watch strap, 3-air bag, 4-photoelectric module, 5-watch body;

[0044] 11-pressure sensor assembly, 111-pressure sensor A, 112-pressure sensor B, 113-flexible circuit board, 114-pressure sensor cover, 12-control board, 13-air pump bracket, 14-air pump, 15-airway seal, 17-airway, 18-air hole A, 19-air hole B;

[0045] 31-airbag fixing buckle, 32-airbag first layer, 33-airbag second layer, 34-thin film pressure sensor, 35-protective film, 36-thin film pressure sensor contact;

[0046] 41 - light emitting diode A, 42 - light emitting diode B, 43 - photosensitive receiver, 44 - housing. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0048] Embodiment 1:

[0049] This embodiment provides a pulse wave sphygmomanometer. By arranging two or more pressure sensors with different ranges in the sphygmomanometer host, the sphygmomanometer can have a good signal in any pressurization section.

[0050] The pulse wave blood pressure meter comprises a main unit, a pressure module 1 disposed inside the main unit, a bandage connected to the main unit, and an air bag 3 disposed on the bandage; the air bag 3 is disposed on the surface of the bandage facing the object to be measured; the air pump assembly inflates the air bag 3 to adjust the pressure inside the air bag 3. The air bag 3 extends from the bandage to the main unit and is connected to the pressure module 1 disposed inside the main unit to perform pressure transmission (i.e., the gas inside the air bag 3 is used as a pressure transmission medium).

[0051] As an example, the air pump assembly is disposed inside the main unit and can be integrated with the pressure module 1 ; the air pump assembly can also be disposed outside the main unit to inflate the airbag 3 .

[0052] The pressure module 1 is provided with more than two pressure sensors of different ranges; as an example, the pressure module 1 is provided with two MEMS pressure sensors of different ranges, namely the first pressure sensor and the second pressure sensor; the first pressure sensor 111 has a larger range and lower precision; while the second pressure sensor 112 has a smaller range and higher precision. The two pressure sensors are used in combination, and in the low-pressure stage, the second pressure sensor 112 with a smaller range is used, and in the high-pressure stage, the first pressure sensor 111 with a larger range is used, so that the sphygmomanometer can have a better signal in any pressure stage.

[0053] The “larger” and “smaller” here refer to the two pressure sensors relative to each other, that is, the measuring range of the first pressure sensor 111 is larger than the measuring range of the second pressure sensor 112 .

[0054] Embodiment 2:

[0055] Based on the above-mentioned embodiment 1, the pulse wave sphygmomanometer further includes a photoelectric module 4, thereby forming a PPG and pressure two-in-one pulse wave sphygmomanometer.

[0056] As an example, when the host is also attached to the object to be measured, the photoelectric module 4 can be arranged on the surface of the host facing the object to be measured.

[0057] As an example, the photoelectric module 4 may also be arranged on the surface of the airbag 3 facing the object to be measured.

[0058] Embodiment 3:

[0059] Based on the above-mentioned embodiment 1 or embodiment 2, this embodiment provides a pulse wave blood pressure meter for wrist, that is, a blood pressure measuring watch. Figure 1 As shown, the host is the watch body 5, and the bandage is the watch strap 2. The watch strap 2 is connected to the watch body 5 to fix the watch body 5; the air bag 3 is arranged on the inner side of the watch strap 2; the pressure module 1 and the air pump assembly are arranged inside the watch body 5. When the photoelectric module 4 is arranged, the photoelectric module 4 is arranged on the inner side of the watch body 5.

[0060] like Figure 1 As shown, an airbag 3 is arranged on the inner side of the strap 2, and the airbag 3 extends from the strap to the watch body 5, and is connected with the pressure module 1 arranged inside the watch body 5 to transfer pressure; at the same time, the air pump assembly is also connected with the airbag 3 for inflating the airbag 3; the air pump assembly adjusts the pressure in the airbag 3 by inflating the airbag 3, thereby achieving different pressures on different measurement objects.

[0061] A watchband 2 is disposed on each of the two opposite sides of the watch body 5, and the airbag 3 can be disposed on one side of the watchband 2. The inner side of the watch body 5 is the bottom of the watch body 5; the inner side of the watchband 2 is the side facing the user's wrist when worn, so that when the airbag 3 is inflated, the airbag 3 gradually expands, and then squeezes the user's wrist to detect blood pressure.

[0062] When the subject wears the watch, when no measurement is being taken, the strap 2 remains in a relaxed state (i.e., the airbag 3 is not inflated); when measurement is required, the pressure of the airbag 3 is adjusted by the air pump assembly, and the airbag 3 is attached to the skin. At the same time, the gas in the airbag 3 acts as a pressure transmission medium to transmit the pressure signal to the pressure module 1, so that the pressure module 1 collects the pressure pulse wave signal.

[0063] In addition, the pulse wave blood pressure monitor can also be used as an upper arm electronic blood pressure monitor, which can be worn on the upper arm through a bandage.

[0064] Embodiment 4:

[0065] Based on the above-mentioned embodiment 1, embodiment 2 or embodiment 3, this embodiment provides a specific structure of the pressure module 1 and the air pump assembly.

[0066] Among the airbag 3, pressure module 1 and air pump assembly, the airbag 3 is connected to the air pump assembly through an air nozzle, and an airway branch is separated between the airbag 3 and the air pump assembly, and the detection ends of each pressure sensor in the pressure module 1 are arranged on the airway branch.

[0067] like Figure 2 and Figure 3 As shown, the pressure module 1 includes: a pressure sensor assembly 11 and a control board 12; the air pump assembly includes: an air pump bracket 13, an air pump 14 and an airway seal 15; the pressure module 1 and the air pump assembly are designed in an integrated manner, that is, the pressure module 1 is arranged on the air pump bracket 13. As an example, the material of the air pump bracket 13 and the airway seal 15 is engineering plastic. The air pump 14 is arranged on the lower end surface of the air pump bracket 13, and the upper end surface of the air pump bracket 13 is provided with an airway 17 (a groove structure arranged on the air pump bracket 13) connected to the air outlet of the air pump 14, and the airway 17 has an airway branch for arranging the detection end of the pressure sensor assembly 11; the airway seal 15 is bonded to the position of the airway 17 and its airway branch on the air pump bracket 13 by glue, and is used to seal the airway 17 and its airway branch.

[0068] The airway seal 15 is provided with an air hole A18 and a plurality of air holes B19 (the airway seal 15 allows the airway 17 to be connected only with the air hole A18 and the air hole B19 to avoid gas leakage). The air hole A18 is a nozzle installation hole, which is used to connect the air nozzle of the airbag and the airway 17. The detection end of each pressure sensor in the pressure sensor assembly 11 corresponds to the air hole B19 one by one (a plurality of air holes B19 are provided on the airway branch), and is arranged at the position corresponding to the air hole B19, and the gas in the airbag is used as the pressure transmission medium to obtain the pulse wave signal.

[0069] A pressure sensor assembly 11 is provided at one end of the upper end surface of the air pump bracket 13. In this example, the pressure sensor assembly 11 includes two MEMS pressure sensors, namely a first pressure sensor 111 and a second pressure sensor 112. The detection ends of the two MEMS pressure sensors are both on an airway branch. The first pressure sensor 111 has a larger range and lower precision, while the second pressure sensor 112 has a smaller range and higher precision. The two pressure sensors are used in combination. In the low-pressure stage, the second pressure sensor 112 with a smaller range is used, and the first pressure sensor 111 with a larger range is used in the high-pressure stage. This enables the sphygmomanometer to have a better signal in any pressurization stage.

[0070] Here, "larger" and "smaller" refer to the two pressure sensors relative to each other, that is, the range of the first pressure sensor 111 is larger than the range of the second pressure sensor 112. As an example, when worn on the wrist as a blood pressure measurement watch, the range of the first pressure sensor 111 is 0-40KPa, and the range of the second pressure sensor 112 is 0-20KPa.

[0071] As an example, the airway branch has a bend to mitigate airflow impact.

[0072] Since the pressure sensors have manufacturing deviations and are sensitive devices, they need to be installed independently and cannot affect each other. Based on this, the two pressure sensors are welded to the flexible circuit board 113 in structure, and the flexible circuit board 113 adopts a bifurcated structure, such as Figure 4 As shown, one end of the flexible circuit board 113 used to install the pressure sensor is a forked structure, which is divided into branches corresponding to the pressure sensors one by one. In this example, it is divided into two branches, which are respectively used to install the first pressure sensor 111 and the second pressure sensor 112, thereby ensuring that the two pressure sensors do not affect each other.

[0073] After the pressure sensor assembly 11 is mounted on the air pump bracket 13 , a pressure sensor cover plate 114 is then fixed on the upper end thereof. The pressure sensor cover plate 114 is fixed on the air pump bracket 13 by means of side buckles.

[0074] The control board 12 is fixed on the upper end surface of the air pump bracket 13 , and the pressure sensor in the pressure sensor assembly 11 sends the detected signal to the control board 12 .

[0075] When the photoelectric module 4 is arranged on the inner side of the watch body 5 , one end of the flexible circuit board 113 is bent downward to be connected to the photoelectric module 4 (the photoelectric module 4 transmits signals to the control board 12 via the flexible circuit board 113 ).

[0076] Embodiment 5:

[0077] Based on any of the above embodiments, this embodiment provides a specific structure and installation method of the airbag.

[0078] A thin film pressure sensor 34 is arranged on the surface of the airbag 3 facing the object to be measured. The thin film pressure sensor 34 is carried on a flexible board. The head of the flexible board is located inside the main engine after extending from the airbag 3 to the connection between the flexible board and the main engine, and is electrically connected to the control board 12 in the pressure module 1; a thin film pressure sensor contact 36 is arranged at the head of the flexible board where the thin film pressure sensor 34 is located, and a spring corresponding to the thin film pressure sensor contact 36 is provided on the control board 12 of the pressure module 1.

[0079] The thin film pressure sensor 34 can sense the tightness of the bandage, and can also calculate blood pressure through the thin film pressure sensor 34 combined with the surface tension method.

[0080] As an example, the airbag 3 adopts a multi-layer structure, wherein the layer connected to the air nozzle is the airbag first layer 32. In the conventional connection method between the airbag 3 and the bandage (such as the watch strap 2), the airbag fixing buckle 31 is arranged on the airbag first layer 32, and the airbag 3 is installed on the watch strap 2 through the airbag fixing buckle 31.

[0081] like Figure 5 As shown, the airbag 3 is a double-layer structure, including a first airbag layer 32 and a second airbag layer 33; the first airbag layer 32 refers to a layer connected to the air nozzle, and an airbag fixing buckle 31 is provided on the first airbag layer 32 to buckle with the strap 2, and the second airbag layer 33 is in contact with the skin.

[0082] However, when a thin film pressure sensor 34 is provided on the surface of the airbag 3 facing the object to be measured, the above-mentioned forward installation method is adopted, and the thin film pressure sensor 34 is installed on the second layer 33 of the airbag, and the first layer 32 of the airbag is connected to the main unit (such as the watch body 5) through the air nozzle; the thin film pressure sensor 34 needs to extend upward to cover the side of the airbag 3 and then extend to the inside of the main unit. Therefore, when the airbag 3 is inflated, due to the expansion of the airbag 3, the thin film pressure sensor 34 will be stretched (that is, the part of the thin film pressure sensor 34 covering the side of the airbag 3 is stretched along the normal direction of the bandage), which affects its measurement accuracy and service life.

[0083] Based on this, in this example, the airbag 3 adopts Figure 6 The reverse installation method shown is to set the airbag fixing buckle 31 on the second layer 33 of the airbag (when the airbag 3 is multi-layered, the airbag fixing buckle 31 is set on its last layer), buckle it with the strap 2, and the first layer 32 of the airbag contacts the skin; that is, at this time, the second layer 33 of the airbag is located between the first layer 32 of the airbag and the strap 2. The film pressure sensor 34 is installed on the surface of the first layer 32 of the airbag facing the object to be measured; because the airbag 3 is connected to the host through the air nozzle set on the first layer 32 of the airbag, the film pressure sensor 34 can directly extend along the surface of the first layer 32 of the airbag to the inside of the host. At the same time, in this installation method, since the first layer 32 of the airbag directly contacts the skin, the signal transmission is more direct.

[0084] like Figure 7 As shown, after adding a thin film pressure sensor 34 to the surface of the first layer 32 of the airbag, a protective film 35 is covered. The material of the protective film 35 is consistent with that of the airbag 3, both are TPU, and are welded together by high-frequency welding.

[0085] Embodiment 6:

[0086] Based on the above embodiment 2, this embodiment provides a specific structure of a photovoltaic module.

[0087] The photoelectric module 4 (i.e., the PPG acquisition unit) includes: a housing 44, a lens (not shown in the figure), a photosensitive receiver 43 and a light-emitting diode group; the housing 44 serves as a mounting base for the lens and provides mounting space for the photosensitive receiver 43 and the light-emitting diode group; the lens is made of glass, and the surface is subjected to anti-reflection treatment to maximize the light transmittance.

[0088] The photosensitive receiver 43 and the light emitting diode group are fixedly mounted (such as welded) on the circuit board inside the housing 44, wherein the light emitting diode group is used to emit a light signal, and the light signal can be at least one of red light, green light, and infrared light. The photosensitive receiver 43 is used to receive the light signal of the light emitting diode group.

[0089] The part of the circuit board where the photosensitive receiver 43 and the light-emitting diode group are fixed corresponds to the position of the lens; as an example, the circuit board in the optoelectronic module is a flexible circuit board, which is electrically connected to the control board 12 in the pressure module 1.

[0090] As an example, the layout of the photosensitive receiver 43 and the light emitting diode group in the optoelectronic module 4 is as follows: Figure 8As shown, in this example, the light-emitting diode group includes two light-emitting diodes A41 and one light-emitting diode B42; wherein the light-emitting diode A41 is a green light, and the light-emitting diode B42 is a two-in-one infrared and red light; two independent green lights are arranged side by side on the left and right sides of the center position inside the shell 44, and a photosensitive receiver 43 is arranged at an equal distance (distance 2.5mm to 3mm) above, on the left and on the right sides of the two green lights; a two-in-one infrared and red light is arranged below the two green lights.

[0091] Therefore, when the light emitting diode A41 is working, the three photosensitive receivers 43 can all receive signals and the best signal can be selected from them; and the photosensitive receiver 43 located at the top is specially paired with the light emitting diode B42, and the distance between the two is set to 6mm to 7.5mm.

[0092] Embodiment 7:

[0093] This embodiment provides a pulse wave measurement device, including: a collection unit, a processing unit and a display unit;

[0094] The acquisition unit is used to acquire the pulse wave signal generated by the target object and send it to the processing unit;

[0095] The processing unit is used to analyze and process the pulse wave signal collected by the collection unit, generate target pulse data, and send it to the display unit;

[0096] The display unit is used to display the pulse beat frequency or waveform of the target object according to the received target pulse data.

[0097] The acquisition unit is the pulse wave sphygmomanometer described in the above-mentioned embodiments 1 to 6.

[0098] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A pulse wave sphygmomanometer, characterized in that: include: A host, a pressure module arranged inside the host, a bandage connected to the host, and an air bag arranged on the bandage; The airbag is arranged on the surface of the bandage facing the object to be tested, and the airbag extends toward the host and is connected to the pressure module arranged inside the host to transmit pressure; the air pump assembly is used to inflate the airbag; The pressure module is provided with more than two pressure sensors with different measuring ranges.

2. The pulse wave sphygmomanometer according to claim 1, characterized in that: The air pump assembly is arranged inside the main machine.

3. The pulse wave sphygmomanometer according to claim 1, characterized in that: It also includes a photoelectric module, which is arranged on a surface of the mainframe facing the object to be measured or on a surface of the airbag facing the object to be measured.

4. The pulse wave sphygmomanometer according to claim 2, characterized in that: The pressure module and the air pump assembly are integrated inside the host; The air pump assembly includes: an air pump, an air pump bracket and an airway seal; the pressure module also includes a control panel; The air pump is mounted on an air pump bracket, and an air passage connected to an air outlet of the air pump is arranged on the air pump bracket, and the air passage has an air passage branch for arranging a detection end of the pressure sensor; The airway seal is mounted on the air pump bracket and is used to seal the airway and the airway branch; The airway seal is provided with an air hole A communicating with the airway and an air hole B communicating with the airway branch and corresponding to the pressure sensor one by one; the airbag is communicated with the airway through the air hole A; the detection end of the pressure sensor is installed in the corresponding air hole B; The control board is mounted on the air pump bracket and is electrically connected to the pressure sensor.

5. The pulse wave sphygmomanometer according to claim 4, characterized in that: The two or more pressure sensors are welded on a flexible circuit board, one end of the flexible circuit board used to install the pressure sensor is divided into branches corresponding to the pressure sensors one by one, and each branch is equipped with a pressure sensor; the flexible circuit board is installed on the air pump bracket.

6. The pulse wave sphygmomanometer according to any one of claims 1 to 5, characterized in that: A thin film pressure sensor is arranged on the surface of the airbag facing the object to be measured.

7. The pulse wave sphygmomanometer according to claim 6, characterized in that: The thin film pressure sensor is carried on a flexible board. After the flexible board extends on the airbag to the connection between the flexible board and the host, the head portion is located inside the host and is electrically connected to the pressure module inside the host.

8. The pulse wave sphygmomanometer according to claim 7, characterized in that: The airbag is a multi-layer structure, and the layer connected to the air pump assembly through the air nozzle is the first layer of the airbag; the first layer of the airbag is in contact with the object to be measured, and the thin film pressure sensor is arranged on the surface of the first layer of the airbag; the airbag fixing buckle is arranged on the last layer of the airbag and buckled with the bandage.

9. The pulse wave sphygmomanometer according to claim 3, characterized in that: The photoelectric module comprises: a housing, a lens, a photosensitive receiver and a light emitting diode group; The housing serves as a mounting base for the lens and provides mounting space for the photosensitive receiver and the light emitting diode group; The light emitting diode group includes two light emitting diodes A and one light emitting diode B; Two independent light emitting diodes A are arranged side by side at the center of the shell, and a photosensitive receiver is arranged at an equal distance above, on the left and on the right of the two light emitting diodes A; and a light emitting diode B is arranged below the two light emitting diodes A.

10. The pulse wave sphygmomanometer according to any one of claims 1 to 5, characterized in that: The host is the watch body, and the bandage is the watch strap; the watch strap is connected to the watch body to form a blood pressure measuring watch.

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