Cuff air bag, cuff and blood pressure measuring device

Abstract

The invention particularly relates to a cuff air bag used for a blood pressure measuring device, and the cuff air bag comprises an air bag which is internally provided with an air cavity; the at least two piezoelectric sensors are distributed on the inner wall of the air bag at intervals, and the at least two piezoelectric sensors are electrically connected; the air pipe connector is arranged on the outer wall of the air bag, and the air pipe connector comprises a first air channel communicated with the air cavity and an electric connecting piece electrically connected with the at least two piezoelectric sensors. According to the cuff air bag, the at least two piezoelectric sensors are distributed on the inner wall of the air bag at intervals, so that the cuff air bag can detect the blood pressure of a user through the air pressure and the piezoelectric signals at the same time, the detection reliability of the cuff air bag is improved, in addition, the cuff air bag can provide a stable pressure measuring environment for the piezoelectric sensors, and the detection accuracy is improved. Therefore, the phenomenon of detection distortion of the piezoelectric sensor is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to a cuff airbag, a cuff and a blood pressure measuring device. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Blood pressure can provide a basis for the diagnosis of some diseases (such as kidney disease, endocrine disease or heart disease, etc.). The existing blood pressure measurement device based on the Korotkoff sound method is to set a sensor in the cuff, specifically, the sensor is set on the outside of the airbag. This structure can set the sensor on the outside of the one-piece airbag, simplifying the process, facilitating manufacturing, and improving the production efficiency of the blood pressure measurement device. However, with this structural design, the sensor often collects more external noise, resulting in a large deviation in the blood pressure measurement result. In particular, this external noise greatly interferes with the identification of Korotkoff sounds, the measurement data is unstable, and the measurement result is prone to detection distortion, which seriously affects the blood pressure measurement result. Summary of the invention

[0004] The purpose of the present application is to at least solve the technical problem of low detection reliability of the existing cuff airbag, and this purpose is achieved through the following technical solutions:

[0005] The first aspect of the present application provides a cuff airbag for a blood pressure measuring device, the cuff airbag comprising: an airbag, an air cavity formed inside the airbag; at least two piezoelectric sensors, the at least two piezoelectric sensors are spaced apart and distributed on the inner wall of the airbag, and the at least two piezoelectric sensors are electrically connected; a trachea joint, the trachea joint is arranged on the outer wall of the airbag, the trachea joint comprises a first airway connected to the air cavity, and an electrical connector electrically connected to the at least two piezoelectric sensors.

[0006] Those skilled in the art will appreciate that the cuff airbag proposed in the present application distributes at least two piezoelectric sensors at intervals on the inner wall of the airbag, so that the cuff airbag can simultaneously detect the user's blood pressure through air pressure and piezoelectric signals, thereby improving the detection reliability of the cuff airbag.

[0007] In addition, the cuff airbag can provide a relatively stable pressure measurement environment for the piezoelectric sensor, thereby reducing the detection distortion of the piezoelectric sensor. Placing the piezoelectric sensor on the inner wall of the airbag can effectively avoid the noise generated outside the airbag during the measurement process. Furthermore, the cuff airbag proposed in this application also has the technical effect of simplifying the structure of the piezoelectric sensor and protecting the piezoelectric sensor.

[0008] In some embodiments, at least two piezoelectric sensors are spaced apart along the length of the airbag.

[0009] In some embodiments, the cuff airbag further includes a flat cable, the flat cable is connected to at least two piezoelectric sensors, and the electrical connector is electrically connected to the flat cable.

[0010] In some embodiments, the cable is elastic along the length direction of the airbag.

[0011] In some embodiments, the airbag includes a first capsule and a second capsule attached to each other, an air cavity is formed between the first capsule and the second capsule, and at least two piezoelectric sensors are arranged on the inner wall of the first capsule.

[0012] In some embodiments, the second capsule is provided with an air port connecting the air cavity with the trachea connector, and a trachea base is provided on the inner wall of the second capsule, the trachea base is provided with an adapter port at a position corresponding to the air port, and the trachea connector is connected to the trachea base.

[0013] In some embodiments, the air vent is disposed at a central position of at least two orthographic projection positions of at least two piezoelectric sensors respectively projected onto the second caplet after the first caplet and the second caplet are bonded.

[0014] In some embodiments, the periphery of the first caplet and the periphery of the second caplet are both provided with a hot melt welding portion, and the first caplet and the second caplet are bonded to each other through the hot melt welding portion to form a peripheral sealing structure of the cuff airbag.

[0015] In some embodiments, the trachea connector is connected to the trachea, the trachea is provided with a second air channel, and the electrical connector passes from the first air channel through the second air channel and is electrically connected to the gas-electric plug.

[0016] A second aspect of the present application provides a cuff, including a cuff airbag and a cuff cover, wherein the cuff airbag is arranged in the cuff cover, and the cuff airbag is arranged as the cuff airbag of the first aspect of the present application.

[0017] The third aspect of the present application provides a blood pressure measuring device, which includes a main unit, a gas-electric plug and a cuff airbag. The cuff airbag is connected to the main unit through the gas-electric plug. The main unit inflates the cuff airbag through the gas-electric plug. The cuff airbag is set as the cuff airbag of the first aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 An axonometric view of a cuff airbag according to an embodiment of the present application;

[0020] Figure 2 for Figure 1 A perspective view of the cuff airbag;

[0021] Figure 3 This is a schematic diagram of the disassembled structure of a cuff airbag according to an embodiment of the present application;

[0022] Figure 4 A cross-sectional view of a cuff airbag according to an embodiment of the present application;

[0023] Figure 5 for Figure 4 A partial structural cross-sectional view of the cuff airbag shown;

[0024] Figure 6 This is a schematic diagram of the structure of a cuff according to an embodiment of the present application.

[0025] The reference numerals are as follows:

[0026] 100, cuff airbag; 101, hot-melt welding portion; 102, positioning structure; 103, air cavity;

[0027] 10. air bag; 11. first capsule; 12. second capsule; 120. air port; 121. tracheal base; 1211. adapter;

[0028] 20. Piezoelectric sensor; 21. Cable;

[0029] 30. air pipe joint; 301. first airway; 31. electrical connector; 311. wiring harness; 312. connecting wire; 32. air pipe; 321. second airway; 33. air-electric plug;

[0030] 1000. cuff; 100. cuff airbag; 200. cuff cover. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the cuff airbag of the present application described in the present application through a blood pressure measuring device is only a preferred embodiment, and does not limit the scope of application of the cuff airbag. For example, the cuff airbag of the present application can also be used in electronic devices such as stethoscopes, and this adjustment does not deviate from the protection scope of the cuff airbag of the present application.

[0032] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", and "have" are inclusive and therefore specify the presence of stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0033] Although the terms first, second, etc. may be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms may only be used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. In addition, in the description of this application, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] For ease of description, spatial relative terms can be used in the text to describe the relationship of an element or feature relative to another element or feature as shown in the figure, and these relative terms are, for example, "end", "length", "inside", "outside", etc. Such spatial relative terms are intended to include different orientations of the mechanism in use or operation except the orientation depicted in the figure. For example, if the mechanism in the figure flips, the element described as "below other elements or features" or "below other elements or features" will be subsequently oriented to "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include the orientation on and below. The mechanism can be oriented in addition (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0035] In order to solve the problem that the existing sensor is set on the outside of the airbag, which causes excessive data noise, this application proposes to set the piezoelectric sensor on the inner wall of the airbag 10 to address the technical problems of the existing blood pressure measurement device with a lot of interference data and poor measurement reliability. The cuff airbag provides a relatively stable working environment for the piezoelectric sensor, thereby reducing and then eliminating the interference of external noise on the piezoelectric sensor in collecting the brachial artery pulsation signal.

[0036] like Figures 1 to 5As shown, an embodiment of the present application provides a cuff airbag 100 for a blood pressure measuring device, wherein the cuff airbag 100 comprises an airbag 10, at least two piezoelectric sensors 20 and an trachea connector 30, wherein an air cavity 103 is formed inside the airbag 10; at least two piezoelectric sensors 20 are spaced apart and distributed on the inner wall of the airbag 10, and at least two piezoelectric sensors 20 are electrically connected and connected in series; the trachea connector 30 is disposed on the outer wall of the airbag 10, and the trachea connector 30 comprises a first airway 301 communicating with the air cavity 103, and an electrical connector 31 electrically connected to at least two piezoelectric sensors 20.

[0037] In this embodiment, the cuff airbag 100 proposed in this application reduces or even eliminates external interference on the brachial artery pulsation signal collected by the piezoelectric sensor by distributing at least two piezoelectric sensors 20 at intervals on the inner wall of the airbag 10, so that the blood pressure measurement device obtains accurate brachial artery pulsation signals and then obtains Korotkoff sound signals, and obtains the user's blood pressure information based on the Korotkoff sound signals and the pressure signal collected by the pressure sensor. This solution effectively shields the interference of noise signals outside the airbag on the signal collected by the piezoelectric sensor by arranging the piezoelectric sensor on the inner wall of the cuff airbag, thereby improving the accuracy of blood pressure measurement.

[0038] Specifically, the cuff airbag 100 provides a relatively stable pressure measurement environment for the piezoelectric sensor 20, thereby reducing the detection distortion of the piezoelectric sensor 20. Moreover, by arranging the piezoelectric sensor 20 on the inner wall of the airbag 10, the internal space of the cuff airbag 100 is effectively utilized to protect the piezoelectric sensor 20, which helps to extend the service life of the piezoelectric sensor.

[0039] It should be noted that the embodiments of the present application do not limit the specific number of the piezoelectric sensors 20 because the invention point of the present application is to set the piezoelectric sensor 20 on the inner wall of the airbag 10. As for the specific number of the piezoelectric sensors 20, it can be set according to actual needs. For example, the number of piezoelectric sensors 20 can be two, three or four. These embodiments all belong to the protection scope of the cuff airbag 100 of the present application. As for other embodiments of the piezoelectric sensor 20, they will not be elaborated one by one here.

[0040] The specific structure of the cuff airbag 100 according to the embodiment of the present application is described in detail below.

[0041] like Figures 2 to 4 As shown, in some embodiments, at least two piezoelectric sensors 20 are spaced apart and distributed along the length direction of the airbag 10, and at least two piezoelectric sensors are electrically connected in series.

[0042] In this embodiment, by distributing at least two piezoelectric sensors 20 at intervals along the length direction of the airbag 10 to ensure that the user wears it on the left arm or the right arm, at least one piezoelectric sensor is correspondingly set at the brachial artery position of one arm, thereby increasing the effective measurement range of at least two piezoelectric sensors 20.

[0043] like Figures 1 to 3 As shown, in some embodiments, the cuff airbag 100 further includes a flat cable 21 , which connects at least two piezoelectric sensors 20 , and an electrical connector 31 , which is electrically connected to the flat cable 21 .

[0044] In this embodiment, the two piezoelectric sensors 20 are connected by the flat cable 21, which can improve the piezoelectric signal transmission efficiency and accuracy of the two piezoelectric sensors 20. In addition, the flat cable 21 is configured to be made of a flexible material, so that the flat cable 21 has a certain bending performance, thereby adapting to the bending condition when the cuff airbag 100 measures blood pressure.

[0045] Furthermore, the flat cable 21 is provided with at least two welding points corresponding to at least two piezoelectric sensors 20 , and the electrical connector 31 includes a wiring harness 311 , and the wiring harness 311 is provided with at least two connecting wires 312 connecting the at least two welding points.

[0046] The two connecting wires 312 are welded to the two welding points of the flat cable 21, and can transmit the two piezoelectric signals of the two piezoelectric sensors 20 to the host of the blood pressure measurement device, thereby improving the transmission reliability of the two piezoelectric signals of the two piezoelectric sensors 20 and reducing the phenomenon of signal transmission interruption caused by the two connecting wires 312 and the two piezoelectric sensors 20 falling off.

[0047] Furthermore, the two soldering points are configured as two soldering holes opened on the cable 21, and the two connecting wires 312 are configured with two contacts respectively electrically contacting the two soldering holes. The two connecting wires 312 are first plugged into the two soldering holes through the two contacts and then soldered, thereby improving the reliability of signal transmission between the two connecting wires 312 and the two piezoelectric sensors 20.

[0048] like Figure 3 As shown, in some embodiments, the cable 21 has elasticity along the length direction of the airbag 10 .

[0049] In this embodiment, the effective measurement range of the cuff airbag 100 can be increased by setting the flat wire 21 to be elastic along the length direction of the airbag 10. Specifically, when the cuff airbag 100 is wrapped around a thicker arm, the flat wire 21 can be stretched so that at least two piezoelectric sensors 20 are located at the artery of the arm to measure the user's blood pressure.

[0050] When the cuff airbag 100 is wrapped around a thinner arm, the flat wire 21 can be further compressed so that at least two piezoelectric sensors 20 are located at the artery of the arm to measure the user's blood pressure.

[0051] like Figures 3 to 5 As shown, in some embodiments, the airbag 10 includes a first capsule 11 and a second capsule 12 attached to each other, an air cavity 103 is formed between the first capsule 11 and the second capsule 12, and at least two piezoelectric sensors 20 are arranged on the inner wall of the first capsule 11.

[0052] In this embodiment, by configuring the airbag 10 to include a first bladder sheet 11 and a second bladder sheet 12 that fit each other, the overall assembly efficiency of the cuff airbag 100 can be improved.

[0053] Specifically, during the assembly process of the cuff airbag 100, one side of the piezoelectric sensor 20 is fixed to the inner wall of the first bag piece 11, and then the piezoelectric sensor 20 and the flat cable 21 are soldered, and the flat cable 21 is connected to the electrical connector 31 in the trachea connector 30, and the trachea connector 30 is connected to the airbag 10 by heat pressing, and finally the overall assembly of the cuff airbag 100 is completed.

[0054] like Figure 3 As shown, in some embodiments, the second capsule 12 is provided with an air port 120 connecting the air cavity 103 with the trachea connector 30, and a trachea base 121 is arranged on the inner wall of the second capsule 12, and the trachea base 121 is provided with an adapter port 1211 at a position corresponding to the air port 120, and the trachea connector 30 is connected to the trachea base 121.

[0055] In this embodiment, the tracheal base 121 has a more stable structure and mechanical properties than the second capsule 12 , thereby reducing the phenomenon of tearing and damage of the tracheal connector 30 at the tracheal base 121 .

[0056] Specifically, the tracheal connector 30 and the tracheal base 121 as well as the tracheal base 121 and the second bag sheet 12 are connected by heat pressing, thereby improving the connection stability and connection sealing between the tracheal connector 30 and the tracheal base 121 as well as the tracheal base 121 and the second bag sheet 12, and reducing the pressure release of the cuff airbag 100 at the tracheal connector 30.

[0057] like Figure 2 and Figure 3As shown, in some embodiments, the air port 120 is arranged at a central position of at least two direct projection positions of at least two piezoelectric sensors 20 respectively projected onto the second capsule 12 after the first capsule 11 and the second capsule 12 are attached, that is, after the first capsule 11 and the second capsule 12 are attached, the trachea connector 30 connected to the air port 120 is located between the at least two piezoelectric sensors, so that when the cuff containing the air bag is wrapped around the arm, the wrinkles generated in the air bag part between the at least two piezoelectric sensors due to the curling of the cuff can be better eliminated, thereby effectively ensuring that the piezoelectric sensor is better aligned with the position of the brachial artery to collect signals, thereby improving the accuracy of the brachial artery pulsation signal collection.

[0058] Furthermore, a portion of the airbag 10 between at least two piezoelectric sensors 20 is provided with wrinkles distributed along the length direction of the airbag 10 .

[0059] By providing a folded portion on the airbag 10, the effective measurement range of the cuff airbag 100 can be increased. Specifically, when the user of the cuff airbag 100 measures a thicker arm, the cuff airbag 100 can be wrapped around the artery of the arm by stretching and unfolding the folded portion, so that at least two piezoelectric sensors 20 can measure blood pressure at the artery of the arm.

[0060] When the user of the cuff airbag 100 measures blood pressure on a thinner arm, the pleated portion can be further folded so that the airbag 10 of the cuff airbag 100 can be wrapped around the artery of the arm, thereby allowing at least two piezoelectric sensors 20 to measure blood pressure at the artery of the arm.

[0061] like Figures 1 to 3 As shown, in some embodiments, the periphery of the first capsule 11 and the periphery of the second capsule 12 are both provided with a hot melt welding portion 101, and the first capsule 11 and the second capsule 12 are bonded by the hot melt welding portion 101 to form a peripheral sealing structure of the cuff airbag 100.

[0062] In this embodiment, by welding and sealing the periphery of the first capsule sheet 11 and the periphery of the second capsule sheet 12 by hot melt welding, the connection stability and connection sealing between the first capsule sheet 11 and the second capsule sheet 12 can be improved, and the leakage of the air cavity 103 of the airbag 10 at the connection between the first capsule sheet 11 and the second capsule sheet 12 can be reduced.

[0063] Specifically, the periphery of the first capsule 11 and the periphery of the second capsule 12 can be sealed and welded by ultrasonic vibration heat welding.

[0064] Furthermore, the corners of the first capsule 11 and the corners of the second capsule 12 are both provided with positioning structures 102 , which are located at the periphery of the hot-melt welding portion 101 and can be separated from the cuff airbag 100 after the peripheral sealing structure is formed.

[0065] The positioning structure 102 has the function of attaching the first caplet 11 and the second caplet 12 at a specified position, thereby reducing the phenomenon of skewed attachment or inadequate attachment between the first caplet 11 and the second caplet 12 .

[0066] Specifically, the positioning structure 102 includes a button structure or a magnetic element. After the first capsule 11 and the second capsule 12 are attached to each other through the positioning structure 102, the first capsule 11 and the second capsule 12 are connected by ultrasonic vibration heat welding. After the first capsule 11 and the second capsule 12 are welded and sealed by hot melt welding, the positioning structure 102 can be cut off from the airbag 10 to reduce the redundant structure of the positioning structure 102 on the airbag 10.

[0067] like Figure 1 and Figure 2 As shown, in some embodiments, the air pipe connector 30 is connected to the air pipe 32 , the air pipe 32 is provided with a second air channel 321 , and the electrical connector 31 passes through the second air channel 321 from the first air channel 301 to be electrically connected to the air-electric plug 33 .

[0068] In this embodiment, the piezoelectric sensor 20 is arranged on the inner wall of the airbag 10, and the electrical connector 31 passes through the second airway 321 from the first airway 301 and is electrically connected to the air-electric plug 33. With such a configuration, the piezoelectric signal of the piezoelectric sensor 20 can be transmitted to the host through the electrical connector 31 in the trachea 32, and the air pressure changes in the cuff airbag 100 can be transmitted through the second airway 321 in the trachea 32, thereby making full use of the internal space of the cuff airbag 100 and the trachea 32 and effectively reducing the wiring cost.

[0069] Specifically, the air pipe 32 is configured as a flexible pipe, and the air pipe 32 can be bent according to the use environment, thereby improving the adaptability of the air pipe 32 to the use environment.

[0070] like Figure 6 As shown, the second aspect of the present application provides a cuff 1000, including a cuff airbag 100 and a cuff cover 200, wherein the cuff airbag 100 is disposed in the cuff cover 200, and the cuff airbag 100 is configured as the cuff airbag 100 of the first aspect of the present application.

[0071] The cuff 1000 provided in the embodiment of the present application includes a cuff cover 200, which plays a role in protecting the cuff airbag 100 to prevent the cuff airbag 100 from being damaged during use to affect the blood pressure measurement result.

[0072] In this embodiment, the cuff 1000 provided in the embodiment of the present application has all the technical effects of the cuff airbag 100 provided in the embodiment of the first aspect of the present application, which will not be described in detail here.

[0073] The third aspect of the present application provides a blood pressure measuring device, which includes a main unit, a gas-electric plug 33 and a cuff airbag 100. The cuff airbag 100 is connected to the main unit through the gas-electric plug 33. The main unit inflates the cuff airbag 100 through the gas-electric plug 33. The cuff airbag 100 is configured as the cuff airbag 100 of the first aspect of the present application.

[0074] In this embodiment, when the main unit of the blood pressure measuring device is connected to the cuff airbag 100 through the gas-electric plug 33, the trachea 32 and the trachea joint 30, the blood pressure measuring device inflates the airbag 10 through the air chamber in the main unit through the second air channel 321 inside the trachea 32. Subsequently, the air pressure in the airbag 10 changes with the blood pressure measurement process. At least two piezoelectric sensors 20 can detect and generate piezoelectric signals at the user's brachial artery. Finally, the piezoelectric signal of the piezoelectric sensor 20 transmits the signal to the main unit through the electrical connector 31 in the trachea 32, and transmits the air pressure change in the cuff airbag 100 through the second air channel 321 in the trachea 32, thereby completing the pressure measurement function of the blood pressure measuring device.

[0075] In addition, the embodiments of the present application only focus on the structures of the cuff airbag 100 and the blood pressure measurement device that are related to the improvements of the present application, and do not mean that the cuff airbag 100 and the blood pressure measurement device do not have other structures, which will not be explained one by one here.

[0076] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the present application.

Claims

1. A cuff airbag for a blood pressure measuring device, characterized in that: The cuff airbag (100) comprises: An airbag (10), wherein an air cavity (103) is formed inside the airbag (10); At least two piezoelectric sensors (20), wherein at least two of the piezoelectric sensors (20) are spaced apart and distributed on the inner wall of the airbag (10), and at least two of the piezoelectric sensors (20) are electrically connected; A tracheal connector (30), the tracheal connector (30) being arranged on the outer wall of the airbag (10), the tracheal connector (30) comprising a first airway (301) communicating with the air cavity, and an electrical connector (31) electrically connected to at least two of the piezoelectric sensors (20).

2. The cuff airbag according to claim 1, characterized in that: At least two of the piezoelectric sensors (20) are spaced apart and distributed along the length direction of the airbag (10), and at least two of the piezoelectric sensors (20) are electrically connected in series.

3. The cuff airbag according to claim 1, characterized in that: The cuff airbag (100) further comprises a flat cable (21), wherein the flat cable (21) is connected to at least two of the piezoelectric sensors (20), and the electrical connector (31) is electrically connected to the flat cable (21).

4. The cuff airbag according to claim 3, characterized in that: The cable (21) has elasticity along the length direction of the airbag (10).

5. The cuff airbag according to claim 1, characterized in that: The airbag (10) includes a first capsule (11) and a second capsule (12) which are bonded to each other, wherein the air cavity (103) is formed between the first capsule (11) and the second capsule (12), and at least two piezoelectric sensors (20) are arranged on the inner wall of the first capsule (11).

6. The cuff airbag according to claim 5, characterized in that: The second capsule (12) is provided with an air port (120) for connecting the air cavity with the trachea connector (30), and a trachea base (121) arranged on the inner wall of the second capsule (12), and the trachea base (121) is provided with an adapter port (1211) at a position corresponding to the air port (120), and the trachea connector (30) is connected to the trachea base (121).

7. The cuff airbag according to claim 6, characterized in that: The air vent (120) is arranged at a central position of at least two orthographic projection positions of at least two piezoelectric sensors (20) respectively projected onto the second capsule (12) after the first capsule (11) and the second capsule (12) are bonded together.

8. The cuff airbag according to claim 5, characterized in that: The periphery of the first capsule piece (11) and the periphery of the second capsule piece (12) are both provided with a hot melt welding portion (101), and the first capsule piece (11) and the second capsule piece (12) are bonded together via the hot melt welding portion (101) to form a peripheral sealing structure of the cuff airbag (100).

9. The cuff airbag according to any one of claims 1 to 8, characterized in that: The air pipe joint (30) is connected to an air pipe (32), the air pipe (32) is provided with a second air passage (321), and the electrical connector (31) passes through the second air passage (321) from the first air passage (301) to be electrically connected to the air-electric plug (33).

10. A cuff, characterized in that: The invention comprises a cuff airbag and a cuff cover, wherein the cuff airbag is arranged in the cuff cover, and the cuff airbag is configured as the cuff airbag (100) according to any one of claims 1 to 9.

11. A blood pressure measuring device, characterized in that: The blood pressure measuring device comprises a main unit, an air-electric plug (33) and a cuff airbag (100); the cuff airbag (100) is connected to the main unit via the air-electric plug (33); the main unit inflates the cuff airbag (100) via the air-electric plug (33); the cuff airbag (100) is configured as the cuff airbag (100) according to any one of claims 1 to 9.

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