Airbag assembly and wearable device

Abstract

The present application discloses an airbag assembly and a wearable device. The airbag assembly and the wearable device can be used in the field of health monitoring to measure blood pressure. During the blood pressure measurement process, the airbag assembly can be configured to reduce the boundary effect caused by a press-fit, increase the effective pressure area, and improve the accuracy and stability of the blood pressure measurement. The airbag assembly includes an inflatable airbag layer and a protruding airbag layer disposed on the surface of the inflatable airbag layer, with an air passage for air circulation disposed between the two airbag layers. The protruding airbag layer includes multiple sub-airbags. The multiple sub-airbags include a first sub-airbag and a second sub-airbag. The first sub-airbag is disposed closer to the center of the inflatable airbag layer than the second sub-airbag. The volume of the inflation cavity of the first sub-airbag is smaller than the volume of the inflation cavity of the second sub-airbag.

Description

[Technical Field]

[0001] The present application relates to the field of wearable devices, and more particularly to airbag assemblies and wearable devices. [Background technology]

[0002] With the popularity of smart wearable devices such as smart watches and smart bands, more and more functions are being incorporated into smart wearable devices. Blood pressure measurement is a new and prominent feature of smart wearable devices. The process of blood pressure measurement requires the inflation of an airbag in the wearable device. After being inflated and expanded, the airbag compresses the user's arteries to measure the user's blood pressure.

[0003] Currently, wearable devices for measuring blood pressure typically use a single-layer airbag structure. Because the single-layer airbag structure has a low overall inflation height, the boundary effect of the single-layer airbag structure is pronounced. As a result, the airbag boundary does not adhere well to the user's skin surface. This makes it difficult to ensure a sufficient effective pressure area. A two-layer structure can partially compensate for the shortcomings of the single-layer structure by overlapping two airbag layers to reduce the boundary effect. However, the two-layer structure has the problem of a high overall inflation height. As a result, the two-layer structure is large overall, thick, has poor breathability, is prone to sweating, is uncomfortable to wear, and is difficult to use. Furthermore, the two-layer structure increases the volume of the airbag's inflation cavity, which reduces its operating efficiency to a certain extent.

[0004] The two-layer structure only weakens the boundary effect to some extent, but it cannot completely avoid it. It is still difficult for the center and other parts of the two-layer structure near the press-fit portion to adhere closely to the user's skin, making it difficult to apply sufficient effective pressure. Therefore, how to weaken the boundary effect, increase the effective pressure area between the airbag and the user's skin surface while ensuring user comfort, and improve the accuracy and stability of blood pressure measurement are urgent issues that need to be resolved. summary Summary of the Invention

[0005] The embodiments of the present application provide an airbag assembly and a wearable device, and the structural design of the airbag assembly increases the effective pressure area between the airbag and the user's skin surface, improving the accuracy and stability of blood pressure measurements.

[0006] From this perspective, the embodiments of the present application provide the following technical solutions.

[0007] According to a first aspect, an embodiment of the present application first provides an airbag assembly, which may be applied to a wearable device for measuring blood pressure. The airbag assembly includes an inflating airbag layer and a protruding airbag layer disposed on a surface of the inflating airbag layer. A first air passageway is disposed between the protruding airbag layer and the inflating airbag layer, and configured to circulate air between the inflating airbag layer and the protruding airbag layer. The protruding airbag layer includes a plurality of sub-airbags, including a first sub-airbag and a second sub-airbag. The first sub-airbag is disposed closer to a center of the inflating airbag layer than the second sub-airbag. That is, the second sub-airbag is disposed closer to an end (press-fit portion) of the inflating airbag layer than the first sub-airbag. The volume of an inflation cavity of the first sub-airbag is smaller than the volume of an inflation cavity of the second sub-airbag. That is, the maximum air volume of the first sub-airbag is smaller than the maximum air volume of the second sub-airbag. That is, in the inflated state, the inflation height of the first sub-airbag is lower than the inflation height of the second sub-airbag.

[0008] Typically, the inflation height of the central portion of the inflation airbag layer is high. Due to the boundary effect, the inflation height of the inflation airbag layer decreases the closer to the press-fit portion of the inflation airbag layer. Therefore, when a sub-airbag of a protruding airbag layer is arranged, the volume of the inflation cavity of the second sub-airbag closer to the press-fit portion of the inflation airbag layer is set to be larger than the volume of the inflation cavity of the first sub-airbag. This makes the inflation height of the second sub-airbag higher than the inflation height of the first sub-airbag in the inflated state, thereby further mitigating the boundary effect, increasing the inflation height of the portion closer to the press-fit portion, increasing the effective pressure area, and improving the accuracy and stability of blood pressure measurement.

[0009] In a possible implementation, the inflatable airbag layer uses a two-layer airbag structure design, including a first inflatable airbag layer and a second inflatable airbag layer stacked together. A connected second air passage is disposed between the two inflatable airbag layers and configured to circulate air between the two inflatable airbag layers. The second air passage may be configured in a bar-like structure. A separating rib is disposed in the second air passage, dividing the second air passage into a plurality of sub-air passages.

[0010] The design of the second air passage allows the airflow to pass through the air passage more smoothly during the inflation process, resulting in a better inflation effect for the inflation airbag layer. In particular, the area close to the press-fitting section can be fully inflated, increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0011] In a possible implementation, the second air passage is disposed in the center of the inflation airbag layer, and there is a specific distance between the second air passage and the end of the inflation airbag layer. The ratio of the width of the second air passage to the width of the inflation airbag layer is greater than 1:10. To fit the shape of the wrist strap of the wearable device, the inflation airbag layer is typically rectangular, having long and short sides. The long side of the inflation airbag layer corresponds to the long side of the wrist strap of the wearable device, and the short side of the inflation airbag layer corresponds to the short side of the wearable device. The width of the inflation airbag layer is determined based on the length of the short side of the inflation airbag layer. The difference between the distance from the second air passage to the long side of the inflation airbag layer and the distance from the second air passage to the short side of the inflation airbag layer is within a predetermined range. For example, the predetermined range may be 5 mm. For example, the distance between the second air passage and the long side of the inflation airbag layer and the distance between the second air passage and the short side of the inflation airbag layer may be set to be the same, with only a certain engineering error.

[0012] The above design allows for more uniform expansion of the inflatable airbag layer during inflation, thereby increasing the effective pressure area and improving the accuracy and stability of blood pressure measurements.

[0013] In a possible implementation, the length of the sub-air passage may be set to less than 30 mm so that the inflatable airbag layer can achieve a better inflation effect during the inflation process. In order to ensure the stability and reliability of the second air passage during the inflation process, the ratio of the length of the sub-air passage to the length of the separating rib may further be set to greater than 2 and less than 8.

[0014] In a possible implementation, the first air passage between the inflating airbag layer and the protruding airbag layer may be configured in a bar-like structure, and a separating rib may be disposed in the first air passage, dividing the first air passage into a plurality of sub-air passages.

[0015] Based on the design of the first air passage, the airflow can pass through the air passage more smoothly during the inflation process, which improves the inflation effect of the protruding airbag layer, increases the effective pressure area, and improves the accuracy and stability of blood pressure measurement.

[0016] In a possible implementation, the reinforcing ribs may be disposed at suitable positions on the inner wall of the inflating airbag layer or the inner wall of the protruding airbag layer based on actual requirements.

[0017] The arrangement of the reinforcing ribs provides a certain restraining effect to the inflation of the airbag. With proper design, the shape of the inflated airbag can be further improved, which further increases the effective pressure area and improves the accuracy and stability of blood pressure measurement.

[0018] In a possible implementation, a reinforcing rib may be disposed at an intermediate position on the inner wall of the inflating airbag layer or the inner wall of the protruding airbag layer.

[0019] Since the reinforcing rib is arranged at the middle position of the inner wall of the inflating airbag layer or the inner wall of the protruding airbag layer, the inflation of the central part of the inflating airbag layer or the protruding airbag layer can be suppressed to a certain extent, and the difference in inflation height between the central part and the end part of the airbag assembly can be reduced, thereby increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0020] In a possible implementation, the airbag wall thickness of the protruding airbag layer may be set to be less than the airbag wall thickness of the inflating airbag layer.

[0021] In the above design, during the process of inflating the airbag, the protruding airbag layer can achieve a better inflation effect than the inflating airbag layer, increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0022] In a possible implementation, the thickness of the airbag wall of the inflating airbag layer closer to the protruding airbag layer can be set to be smaller than the thickness of the airbag wall of the inflating airbag layer away from the protruding airbag layer.

[0023] The above design allows the side closer to the user's skin surface to have a good inflation effect, improving the accuracy and stability of blood pressure measurement. In addition, the inflation away from the user's skin surface is appropriately restricted, reducing the overall inflation height of the inflated airbag and improving wearing comfort.

[0024] In a possible implementation, an airbag wall of non-uniform thickness may be provided for the inflating or protruding airbag layer.

[0025] The thickness of the airbag wall affects the inflation of the airbag to some extent. For example, a thick airbag wall imposes a certain limitation on the inflation of the airbag to some extent. As a result, when comparing a thick airbag wall and a thin airbag wall in the same airbag, the thinner airbag wall will have a better inflation effect. Therefore, by appropriately designing the thickness of the airbag wall, the difference in inflation height between the central part of the airbag and the part near the press-fit part can be reduced, thereby increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0026] Specifically, in one possible implementation, the thickness of the airbag wall near the center of the inflating airbag layer is greater than the thickness of the airbag wall away from the center of the inflating airbag layer. In another possible implementation, the thickness of the airbag wall of a first sub-airbag near the center of the inflating airbag layer relative to a second sub-airbag is greater than the thickness of the airbag wall of the second sub-airbag. In another possible implementation, the multiple sub-airbags included in the protruding airbag layer further include a third sub-airbag, and the thickness of the airbag wall near the center of the third sub-airbag is greater than the thickness of the airbag wall away from the center of the third sub-airbag.

[0027] All of the above specific designs of the airbag wall thickness can have the effect of reducing the height difference between the inflation height of the central part of the airbag assembly and the inflation height of the part close to the press-fit part, thereby increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0028] In a possible implementation, the volume of the inflation cavities of the sub-airbags gradually increases from a position closer to the center of the inflating airbag layer to a position further from the center of the inflating airbag layer, i.e., the maximum air volume of the sub-airbags gradually increases, i.e., the inflation height of the sub-airbags gradually increases in the inflated state.

[0029] Based on this gradient design, the surface height of the inflated airbag assembly can be reliably stabilized, providing a better pressurizing effect, thereby improving the accuracy and stability of blood pressure measurement.

[0030] In a possible implementation, a fold structure can be disposed on the airbag wall of the inflated airbag layer near the press fit. For example, the fold structure can be formed in the airbag wall by hot pressing, or the fold structure can be formed by another possible process.

[0031] By providing the folding structure, the shape of the inflated airbag layer can be further improved.

[0032] In a possible implementation, among the multiple sub-airbags included in the protruding airbag layer, some sub-airbags are arranged independently (not connected to each other) and some sub-airbags are connected to each other. Specifically, the multiple sub-airbags include a fourth sub-airbag and a fifth sub-airbag adjacent to each other. A connected air passage is arranged between the fourth sub-airbag and the fifth sub-airbag and configured to circulate air between the fourth sub-airbag and the fifth sub-airbag. The multiple sub-airbags further include a sixth airbag adjacent to the fourth sub-airbag. The fourth sub-airbag and the sixth airbag are independent from each other and do not have a connected air passage.

[0033] Because the connected air passages are selectively located between two adjacent sub-airbags, the inflation shape of the inflated protruding airbag layer can be changed to accommodate different users or different wrist strap shapes, increasing the effective pressure area and improving the accuracy and stability of blood pressure measurements.

[0034] In a possible implementation, the multiple sub-airbags included in the protruding airbag layer may have a rod-shaped, rectangular, diamond-shaped or circular structure. The multiple sub-airbags may have the same shape or different shapes.

[0035] In a possible implementation, an air inlet is disposed in the inflatable airbag layer to provide communication between the inflation cavity of the inflatable airbag layer and the ambient air.

[0036] According to a second aspect, an embodiment of the present application provides an airbag assembly, which may be applied to a wearable device for measuring blood pressure. The airbag assembly includes an inflatable airbag layer. The inflatable airbag layer includes a first inflatable airbag layer and a second inflatable airbag layer stacked together. A connected second air passage is disposed between the two inflatable airbag layers and configured to circulate air between the two inflatable airbag layers. The second air passage may be configured in a rod-like structure. A separating rib is disposed in the second air passage, dividing the second air passage into a plurality of sub-air passages.

[0037] In a possible implementation, the second air passage is disposed in the center of the inflation airbag layer, and there is a specific distance between the second air passage and the end of the inflation airbag layer. The ratio of the width of the second air passage to the width of the inflation airbag layer is greater than 1:10. To fit the shape of the wrist strap of the wearable device, the inflation airbag layer is typically rectangular, including long and short sides. The long side of the inflation airbag layer corresponds to the long side of the wrist strap of the wearable device, and the short side of the inflation airbag layer corresponds to the short side of the wearable device. The width of the inflation airbag layer is determined based on the length of the short side of the inflation airbag layer. The difference between the distance from the second air passage to the long side of the inflation airbag layer and the distance from the second air passage to the short side of the inflation airbag layer is within a predetermined range. For example, the predetermined range may be 5 mm. For example, the distance from the second air passage to the long side of the inflation airbag layer and the distance from the second air passage to the short side of the inflation airbag layer may be set to be the same, with only a certain engineering error.

[0038] In a possible implementation, the length of the sub-air passage may be set to less than 30 mm so that the inflatable airbag layer can achieve a better inflation effect during the inflation process. In order to ensure the stability and reliability of the second air passage during the inflation process, the ratio of the length of the sub-air passage to the length of the separating rib may further be set to greater than 2 and less than 8.

[0039] In a possible implementation, the airbag assembly further includes a protruding airbag layer. A connected first air passage is disposed between the inflating airbag layer and the protruding airbag layer and configured to circulate air between the inflating airbag layer and the protruding airbag layer. The protruding airbag layer includes a plurality of sub-airbags. The plurality of sub-airbags includes a first sub-airbag and a second sub-airbag. The first sub-airbag is disposed closer to the center of the inflating airbag layer than the second sub-airbag. That is, the second sub-airbag is disposed closer to the end (press-fit portion) of the inflating airbag layer than the first sub-airbag. The volume of the inflation cavity of the first sub-airbag is smaller than the volume of the inflation cavity of the second sub-airbag. That is, the maximum air volume of the first sub-airbag is smaller than the maximum air volume of the second sub-airbag. That is, in an inflated state, the inflation height of the first sub-airbag is lower than the inflation height of the second sub-airbag.

[0040] According to a third aspect, an embodiment of the present application provides a wearable device, which may be configured to measure blood pressure. The wearable device includes a watch body, a pressure sensor, and an airbag assembly as described in the first or second aspect. The pressure sensor is electrically connected to the watch body and configured to detect air pressure in the airbag assembly.

[0041] In one possible form, the wearable device further includes a wrist strap, with the airbag assembly disposed within the wrist strap.

[0042] The second and third aspects of the present embodiment can achieve the beneficial effects described in the first aspect, and to avoid repetition, the details will not be described again here. [Brief explanation of the drawings]

[0043] [Figure 1] FIG. 1 is a diagram of the structure of a single layer airbag assembly according to one embodiment of the present application. [Figure 2]FIG. 2 is a diagram of the structure of a dual layer airbag assembly according to one embodiment of the present application. [Figure 3] FIG. 3 is a top view of a single layer airbag assembly according to one embodiment of the present application. [Figure 4] FIG. 4 is a side view of an inflated single layer airbag according to one embodiment of the present application. [Figure 5] FIG. 5 is a diagram of the effective pressure area of ​​an airbag assembly according to one embodiment of the present application. [Figure 6] FIG. 6 is a diagram of the structure of an airbag assembly according to one embodiment of the present application. [Figure 7] FIG. 7 is a diagram of the structure of an inflatable airbag layer according to one embodiment of the present application. [Figure 8] FIG. 8 is a diagram of a protruding airbag layer structure according to one embodiment of the present application. [Figure 9] FIG. 9 is a diagram of another projecting airbag layer structure according to one embodiment of the present application. [Figure 10] FIG. 10 is a diagram of yet another projecting airbag layer structure according to one embodiment of the present application. [Figure 11] FIG. 11 is a diagram of another airbag assembly structure according to an embodiment of the present application. [Figure 12] FIG. 12 is a diagram of yet another airbag assembly structure according to an embodiment of the present application. [Figure 13] FIG. 13 is a diagram of an air passage structure according to one embodiment of the present application. [Figure 14] FIG. 14 is a diagram of another air passageway configuration according to an embodiment of the present application. [Figure 15a] FIG. 15a is a diagram of yet another airbag assembly structure according to an embodiment of the present application. [Figure 15b] FIG. 15b is a diagram of yet another airbag assembly structure according to an embodiment of the present application. [Figure 15c] FIG. 15c is a diagram of a further airbag assembly structure according to an embodiment of the present application. [Figure 16a]FIG. 16a is a diagram of a further airbag assembly structure according to an embodiment of the present application. [Figure 16b] FIG. 16b is a diagram of a further airbag assembly structure according to an embodiment of the present application. [Figure 17] FIG. 17 is a diagram of a further airbag assembly structure according to an embodiment of the present application. [Figure 18] FIG. 18 is a diagram of another inflatable airbag layer structure according to one embodiment of the present application. [Figure 19] FIG. 19 is a diagram of the structure of a wearable device according to one embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0044] Reference sign: 1: Single layer airbag structure, 101: Central portion of single layer airbag, 102: Press-fit portion of single layer airbag, 2: Double layer airbag structure, 201: Central portion of double layer airbag, 202: Press-fit portion of double layer airbag structure, 301: Air inlet, 302: Press-fit portion at boundary of airbag, 6: Airbag assembly, 601: Inflated airbag layer, 602: Protruding airbag layer, 603: First air passage, 6021: First sub-airbag, 6022: Second sub-airbag 6011: airbag wall of inflating airbag layer, 6012: air inlet, 6013: inflation cavity, 6014: first inflating airbag layer, 6015: second inflating airbag layer, 604: second airbag, 6042: sub-air passage, 6041: separating rib, 6016: reinforcing rib on inner wall of inflating airbag layer, 6023: reinforcing rib on inner wall of protruding airbag layer, 601111: first airbag wall, 60112: second airbag wall, 7: watch body

[0045] The following describes embodiments of the present invention with reference to the accompanying drawings of embodiments of the present invention. The following description presents the accompanying drawings in which certain aspects of embodiments of the present invention or certain aspects of embodiments of the present invention may be used. It should be noted that the embodiments of the present invention may be used in other ways and may include structural or logical changes not shown in the accompanying drawings. Therefore, the following detailed description should not be construed in a limiting sense, and the scope of the present invention is defined by the appended claims. For example, it should be understood that content disclosed in combination with a described method may also apply to a corresponding apparatus or system configured to perform the method, and vice versa. For example, when one or more particular method steps are described, the corresponding apparatus may include one or more units, such as functional units, for performing the described method steps (e.g., one unit performing one or more steps or multiple units each performing one or more of the steps), even if such one or more units are not explicitly described or shown in the accompanying drawings. Additionally, for example, when a particular apparatus is described based on one or more units, such as functional units, a corresponding method may include steps used to perform the functions of the one or more units (e.g., a step used to perform the function of one or more units, or multiple steps each used to perform the functions of one or more of the units), even if such one or more steps are not explicitly described or shown in the accompanying drawings. Also, unless otherwise stated, it should be understood that features of the embodiments and / or aspects described herein may be combined with each other.

[0046] In embodiments of the present invention, "at least one" means one or more, and "plurality" means two or more. The term "and / or" describes an association relationship between related objects and can indicate a three-way relationship. For example, A and / or B can indicate the presence of only A, the presence of both A and B, and the presence of only B. A and B can be singular or plural. The symbol " / " typically indicates an "or" relationship between related objects. "At least one of the following items (pieces)" or similar expressions means any combination of these items, including any combination of singular items or multiple items (pieces). For example, at least one item (piece) of a, b, or c refers to a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c can be singular or plural.

[0047] The terminology used in the "Implementation of the Invention" section is intended to describe particular embodiments of the invention only and is not intended to limit the invention.

[0048] With the popularity of smart wearable devices such as smart watches and smart bands, more and more functions are being incorporated into smart wearable devices. Blood pressure measurement is a new and prominent feature of smart wearable devices. The process of blood pressure measurement requires the inflation of an airbag in the wearable device. After being inflated and expanded, the airbag compresses the user's arteries to measure the user's blood pressure.

[0049] Currently, single-layer airbag structures are commonly used in wearable devices for measuring blood pressure. FIG. 1 is a side view of an inflated single-layer airbag structure 1. It can be seen that the side of the inflated single-layer airbag structure forms an oval-like shape. The central portion 101 has a high inflation height, which allows it to make good contact with the user's skin surface and provide effective pressure. However, the inflation height of the portion near the press-fit portion 102 is much lower than the inflation height of the central portion, making it difficult to make good contact with the user's skin surface and provide effective pressure.

[0050] Figure 2 is a side view of an inflated dual-layer airbag structure 2. The dual-layer airbag structure is an improvement over the single-layer airbag structure, reducing the boundary effect and increasing the effective pressure area. The dual-layer airbag structure includes two single-layer airbags arranged side by side. Compared to the single-layer airbag, the inflation height of the central portion 201 is greater, as is the inflation height of the portion near the press-fit portion 202. The dual-layer airbag structure partially compensates for the shortcomings of the single-layer airbag structure, and the overlapping of the two airbag layers reduces the boundary effect. However, the dual-layer airbag design also has several problems. First, due to the large overall inflation height, the dual-layer airbag structure is large and thick, resulting in poor breathability, sweating, poor wearability, and poor usability. Second, the dual-layer airbag structure increases the volume of the airbag's inflation cavity, increasing the air demand during inflation and reducing operational efficiency to some extent. Third, the dual-layer airbag structure only partially reduces the boundary effect; it cannot completely avoid it. It is still difficult to bring the boundary of the two-layer airbag structure into close contact with the user's skin at the intermediate position, making it difficult to apply sufficient effective pressure.

[0051] Both single-layer and double-layer airbag structures cannot fully solve the boundary effect problem, and when applied to wearable devices, they have difficulty in providing sufficient effective pressure. As a result, the accuracy and stability of blood pressure measurement during use cannot be ensured. Therefore, an urgent issue to be solved is how to reduce the boundary effect, increase the effective pressure area between the airbag and the user's skin surface, and improve the accuracy and stability of blood pressure measurement while ensuring the user's wearing comfort.

[0052] A single-layer airbag structure will be used as an example to describe in detail the technical problems to be solved in the embodiments of the present application. As shown in FIG. 3, an airbag in a wearable device typically has a substantially rectangular structure and is configured to fit the shape of a wrist strap of the wearable device. In FIG. 3, the direction AA is the length direction of the wrist strap, and the direction BB is the width direction of the wrist strap. The airbag structure 3 includes at least one air inlet 301 configured to inflate the airbag. To achieve airbag sealing, a press-fit process is applied to the boundary of the airbag. Therefore, the airbag structure 3 further includes a press-fit portion 302 located at the boundary of the airbag.

[0053] As shown in FIG. 4, (a) is a side view of a typical inflated single-layer airbag structure. It can be seen that the inflation effect is low in the area close to the press-fit portion 102 due to the influence of the press-fit portion 102. As a result, the inflation height gradually decreases from the central portion 101 of the airbag to the area close to the press-fit portion 102. In this case, to obtain a good pressurization effect, the central portion 101 of the airbag is brought into close contact with the user's skin surface. This pressurization effect gradually decreases from the central portion 101 of the airbag to the press-fit portion 102. As shown in FIG. 4, (a) is a top view of a typical inflated single-layer airbag structure. The central portion can provide effective pressure, but the area close to the press-fit portion cannot. In the top view shown in FIG. 4, the area in the airbag structure that can provide effective pressure is called the effective pressure area.

[0054] To solve the above problems, the prior art typically uses a method of increasing the volume of the inflation cavity of the airbag to increase the overall inflation height of the airbag and further increase the effective pressure area. However, this method increases the overall inflation height of the airbag, resulting in a thicker wrist strap for the wearable device. Another method increases the width of the airbag to increase the effective pressure area. However, this method increases the width of the airbag and therefore the wrist strap for the wearable device. Both of these two methods affect the aesthetics of the wearable device and the user's wearing comfort to some extent.

[0055] Therefore, as shown in Figure 4, the main problem to be solved in the embodiment of the present application is how to increase the effective pressure area by improving the design of the airbag, and Figure 4(b) shows a side view of an inflated airbag. Compared with an inflated general airbag (a), the attenuation of the inflation height of the inflated airbag (b) from the central portion 101 to the portion close to the press-fit portion 102 is small, so the inflated airbag (b) can have a larger effective pressure area against the user's skin surface, providing a better pressurization effect.

[0056] As shown in Figure 5, the airbag design has been improved. On the one hand, the effective pressure area can be increased without changing the width of the airbag, improving the accuracy and stability of blood pressure measurement and effectively reducing measurement errors caused by incorrect wearing techniques or differences in wrist size. On the other hand, the inflation height of the central part of the airbag can be reduced while maintaining the same effective pressure area, making the wrist strap of the wearable device lighter and thinner and improving the user's wearing comfort. The width of the airbag can be further reduced, making the wrist strap of the wearable device narrower and improving the user's wearing comfort. The amount of air required to inflate the airbag can be further reduced, improving the operating efficiency of the airbag inflation.

[0057] To address the boundary effect problem present in conventional airbag structures, the present embodiment provides an airbag assembly that can provide a large effective pressure area during inflation. For details, see FIG. 6 . FIG. 6 is a diagram of the structure of an airbag assembly according to an embodiment of the present application. Specifically, FIG. 6 is a side view of the airbag assembly according to an embodiment of the present application. When the airbag assembly shown in FIG. 6 is used in a smart wearable device to measure blood pressure, the direction of BB in the figure corresponds to the width direction of the wrist strap. As shown in FIG. 6 , the airbag assembly provided in the present embodiment includes an inflating airbag layer 601 and a protruding airbag layer 602. The protruding airbag layer 602 is disposed on the surface of the inflating airbag layer 601. A connected first air passage 603 is disposed between the protruding airbag layer 602 and the inflating airbag layer 601 and configured to circulate air between the inflating airbag layer 601 and the protruding airbag layer 602. When the airbag assembly shown in FIG. 6 is used in a smart wearable device to perform blood pressure measurements, the protruding airbag layer 602 is the side closer to the user's skin surface and the inflating airbag layer is the side away from the user's skin surface.

[0058] The inflation airbag layer 601 is configured to perform an inflation function to ensure that a specific inflation height is formed and sufficient pressure is provided after the entire airbag assembly is inflated. As shown in FIG. 7 , the inflation airbag layer 601 includes an airbag wall 6011, an air inlet 6012, and an inflation cavity 6013. The air inlet 6012 is disposed on the inflation airbag layer 601. The air inlet 6012 allows communication between the inflation cavity 6013 of the inflation airbag layer 601 and the outside air, and is configured to inflate the inflation cavity with the outside air or to exhaust the air in the inflation cavity. It should be understood that the air inlet 6012 may be disposed at any position on the inflation airbag layer based on actual requirements, which is not limited in the embodiment of the present application.

[0059] In another possible implementation, the air inlets may be separately located on the inflating airbag layer 601 and the protruding airbag layer 602 so that inflation occurs simultaneously to improve inflation efficiency and shorten inflation time. In this design, the first air passage 603 may be located between the inflating airbag layer 601 and the protruding airbag layer 602, or the first air passage 603 may not be located.

[0060] The protruding airbag layer includes a plurality of protruding sub-airbags, each of which includes an airbag wall and an inflation cavity. The number and size of the sub-airbags can be designed according to actual circumstances. This is not a limitation of the present embodiment. Similarly, the specific shape of the sub-airbags is not a limitation of the present embodiment. For example, the sub-airbags may have a rod-like structure as shown in FIG. 8 or FIG. 9, or a rectangular structure as shown in FIG. 10. Alternatively, the sub-airbags may have a diamond-shaped structure, a circular structure, or any other possible shape. The shapes of the sub-airbags may be the same or different. This is not a limitation of the present application.

[0061] In a possible implementation, as shown in FIG. 6 , the protruding airbag layer 602 includes multiple sub-airbags arranged independently of each other. In this case, the inflation cavities of the sub-airbags are not connected to each other. A connected air passage 603 is arranged between each sub-airbag and the inflating airbag layer 601, and is configured to circulate air between the inflating airbag layer 601 and each sub-airbag. In another possible implementation, as shown in FIG. 11 , the multiple sub-airbags included in the protruding airbag layer are connected to each other. That is, the inflation cavities of the sub-airbags are connected to each other. In addition, a connected air passage 603 is arranged between the protruding airbag layer 602 and the inflating airbag layer 601, and is configured to circulate air between the inflating airbag layer 601 and the protruding airbag layer 602. One or more air passages 603 may be arranged. In another possible implementation, among the multiple sub-airbags included in the protruding airbag layer 602, some sub-airbags may be configured to be connected and some sub-airbags may be configured to be independent. The specific connection or independence between the sub-airbags may be designed based on actual conditions. This is not a limitation in the embodiments of the present application.

[0062] In a possible embodiment, among the multiple sub-airbags included in the protruding airbag layer 602, some sub-airbags are arranged independently (not connected to each other) and some sub-airbags are connected to each other. Specifically, the multiple sub-airbags include a fourth sub-airbag and a fifth sub-airbag adjacent to each other. A connected air passage is arranged between the fourth sub-airbag and the fifth sub-airbag and is configured to circulate air between the fourth sub-airbag and the fifth sub-airbag. The multiple sub-airbags further include a sixth airbag adjacent to the fourth sub-airbag. The fourth sub-airbag and the sixth airbag are independent of each other and do not have a connected air passage.

[0063] Since the connected air passages are selectively selected between two adjacent sub-airbags, the inflation shape of the inflated protruding airbag layer can be changed to suit different users or different wrist strap shapes, thereby increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0064] The protruding airbag layer including multiple sub-airbags is disposed on the surface of the inflating airbag layer, which can mitigate to some extent the boundary effect caused by the press-fit portion, increase the inflation height of the portion close to the press-fit portion, increase the effective pressure area, and improve the accuracy and stability of blood pressure measurement.

[0065] In a possible implementation, as shown in FIG. 6 , the multiple sub-airbags include a first sub-airbag 6021 and a second sub-airbag 6022. The first sub-airbag 6021 is disposed closer to the center of the inflatable airbag layer 601 than the second sub-airbag 6022. That is, the first sub-airbag 6021 is disposed farther from the press-fit portion of the inflatable airbag layer 601 than the second sub-airbag 6022. The volume of the inflation cavity of the first sub-airbag 6021 is smaller than the volume of the inflation cavity of the second sub-airbag 6022. That is, the maximum air capacity of the first sub-airbag 6021 is smaller than the maximum air capacity of the second sub-airbag 6022. That is, in an inflated state, the inflation height of the first sub-airbag 6021 is smaller than the inflation height of the second sub-airbag 6022.

[0066] As described above, the inflation height of the central portion of the inflating airbag layer 601 is usually greater. Due to the presence of this boundary effect, the inflation height of the inflating airbag layer 601 decreases the closer to the press-fit portion of the inflating airbag layer 601. For this reason, when arranging the sub-airbags of the protruding airbag layer 602, the volume of the inflation cavity of the second sub-airbag 6022 closer to the press-fit portion of the inflating airbag layer 601 is set to be greater than that of the first sub-airbag 6021, thereby making the inflation height of the second sub-airbag 6022 in the inflated state greater than the inflation height of the first sub-airbag 6021. This further mitigates the boundary effect, increases the inflation height of the portion closer to the press-fit portion, and increases the effective pressure area, thereby improving the accuracy and stability of blood pressure measurement.

[0067] In a possible implementation, the volume of the inflation cavities of the multiple sub-airbags gradually increases in a direction from closer to the center of the inflating airbag layer 601 to farther from the center of the inflating airbag layer, i.e., the maximum air volume of the multiple sub-airbags gradually increases, i.e., the inflation height of the multiple sub-airbags gradually increases in an inflated state.

[0068] Based on this gradient design, it ensures a stable surface height of the inflated airbag assembly, providing a better pressurization effect and improving the accuracy and stability of blood pressure measurement.

[0069] In one possible implementation, the inflatable airbag layer 601 includes only a single layer of inflatable airbag. In another possible implementation, as shown in FIG. 12 , the inflatable airbag layer 601 includes a first inflatable airbag layer 6014 and a second inflatable airbag layer 6015 stacked together. A connected second air passage 604 is disposed between the first inflatable airbag layer 6014 and the second inflatable airbag layer 6015 and configured to circulate air between the first inflatable airbag layer 6014 and the second inflatable airbag layer 6015. The overall inflation height of the airbag assembly can be increased by increasing the number of inflatable airbag layers. In another possible implementation, the inflatable airbag layer 601 may further include more stacked inflatable airbag layers, for example, a third inflatable airbag layer and a fourth inflatable airbag layer. The number of inflatable airbag layers is not limited in the present embodiment and can be designed based on actual circumstances.

[0070] In another embodiment, the air inlet 6012 may be arranged on any inflatable airbag layer based on requirements, and airbag layers not having an air inlet arranged thereon are indirectly inflated using the air passages connected between the inflatable airbag layers. In another possible embodiment, one air inlet may be arranged for each inflatable airbag layer. In this case, the second air passage 604 may be arranged between the first and second inflatable airbag layers, or the second air passage 604 may not be arranged. In another possible embodiment, air inlets may be arranged for several inflatable airbag layers. The connected air passages between the inflatable airbag layers are used to inflate other inflatable airbag layers not having an air inlet arranged thereon. The specific method of arranging the air inlets is not limited to the embodiments of the present application.

[0071] In a possible implementation, the second air passage 604 is a bar-like structure, as shown in Figure 13. A separating rib 6041 is disposed in the second air passage 604, and the separating rib 6041 divides the second air passage into a number of sub-air passages 6042.

[0072] When the air flow path structure shown in Fig. 13 is used to inflate an airbag assembly, the airflow can pass through the air flow path more smoothly, resulting in a better inflation effect of the inflatable airbag layer. In particular, the portion close to the press-fit portion can also be fully inflated, increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0073] In a possible embodiment, as shown in FIG. 14, the second air flow passage 604 is disposed in the center of the inflating airbag layer 601, and there is a predetermined distance between the second air flow passage 604 and the periphery of the inflating airbag layer 601. In FIG. 14, AA is the direction of the long side of the inflating airbag layer 601. The direction of the long side of the inflating airbag layer 601 corresponds to the length direction of the wrist strap of the wearable device. The length of the long side of the inflating airbag layer 601 is referred to as the length of the inflating airbag layer. BB is the direction of the short side of the inflating airbag layer 601. The direction of the short side of the inflating airbag layer 601 corresponds to the width direction of the wrist strap of the wearable device. The length of the short side of the inflating airbag layer 601 is referred to as the width of the inflating airbag layer. In a possible embodiment, the ratio of the width of the second air passage 604 to the width of the inflating airbag layer 601 is greater than 1:10. In addition, the difference between the distance from the second air passage 604 to the long side of the inflated airbag layer and the distance from the second air passage 604 to the short side of the inflated airbag layer is within a preset range. For example, the preset range may be 5 mm. For example, the distance between the second air passage 604 and the long side of the inflated airbag layer and the distance between the second air passage 604 and the short side of the inflated airbag layer may be set to be the same, with only a certain engineering error.

[0074] The above design allows the inflation airbag layer 601 to expand more uniformly during inflation, increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0075] As a specific design of the sub-air passages 6042 and separating rib 6041 in the second air passage 604, in a possible implementation, the length of the sub-air passage 6042 may be set to less than 30 mm, so that when the inflation airbag layer is inflated through the sub-air passage, the inflation effect of the inflation airbag layer is better. In addition, the separating rib 6041 can stably divide the second airbag 604 into multiple sub-air passages 6042, ensuring the reliability of the second airbag 604 during the inflation process. Therefore, the ratio of the length of the sub-air passages 6042 to the length of the separating rib 6041 may be set to be greater than 2 and less than 8. Based on this, the length of the separating rib may be set to be 4 mm to 10 mm.

[0076] In a possible implementation, the first air passage 603 between the inflating airbag layer 601 and the protruding airbag layer 602 can also be arranged in the structure shown in FIG. 13 . That is, the first air passage 603 has a rod-like structure. A separating rib is arranged in the first air passage 603, and the separating rib divides the first air passage 603 into multiple sub-air passages. When the design shown in FIG. 6 is used, the first airbag 603 is arranged in the center of the sub-airbag, and there is a predetermined distance between the first airbag 603 and the end of the sub-airbag (the portion where the airbag wall of the sub-airbag and the airbag wall of the inflating airbag layer are press-fitted). When the design shown in FIG. 11 is used, the first airbag 603 is arranged in the center of the protruding airbag layer 602, and there is a predetermined distance between the first airbag 603 and the end of the protruding airbag layer 602 (the portion where the airbag wall of the protruding airbag layer and the airbag wall of the inflating airbag layer are press-fitted).

[0077] To further improve the shape of the inflated airbag, reinforcing ribs 6016 may be arranged at appropriate positions on the inner wall of the inflated airbag layer 601 based on actual requirements. Arranging the reinforcing ribs 6016 provides a certain restraining effect on the inflation of the airbag and changes the shape of the inflated airbag. The reinforcing ribs 6016 may be arranged in various shapes, sizes, and positions based on actual requirements. In the embodiments of the present application, the shape, size, number, position, etc. of the reinforcing ribs 6016 are not limited.

[0078] By properly designing the position of the reinforcing rib 6016, the effective pressure area can be further increased, improving the accuracy and stability of blood pressure measurement.

[0079] In a possible implementation, the reinforcing rib 6016 may be disposed at a central position on the inner wall of the inflating airbag layer 601. For example, as shown in Fig. 15a, the reinforcing rib 6016 may be disposed only on the inner wall of the airbag wall closest to the protruding airbag layer 602. Alternatively, as shown in Fig. 15b, the reinforcing rib 6016 may be disposed on the inner walls of two airbag walls so as to face each other. Because the reinforcing rib 6016 is disposed at a central position on the inner wall of the inflating airbag layer 601, it can restrict the inflation of the central portion of the inflating airbag layer 601 to a certain extent and reduce the difference in inflation height between the central portion of the inflating airbag layer 601 and the portion close to the press-fit portion, thereby increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0080] In another possible implementation, the reinforcing ribs 6016 may alternatively be positioned at another location inside the airbag wall of the inflating airbag layer 601. For example, the reinforcing ribs 6016 may be positioned as shown in Figure 15c.

[0081] Regarding the arrangement of the reinforcing ribs 6016 on the inner wall of the inflating airbag layer 601, the reinforcing ribs 6023 may be arranged at appropriate positions on the inner wall of the protruding airbag layer 602 based on actual requirements. The reinforcing ribs 6023 may have a certain restraining effect on the inflation of the airbag and change the shape of the inflated airbag. The reinforcing ribs 6023 may be arranged in various shapes, sizes, and positions based on actual requirements. The shape, size, number, position, etc. of the reinforcing ribs 6023 are not limited in the embodiments of the present application.

[0082] By appropriately designing the position of the reinforcing rib 6023, the effective pressure area can be further increased, improving the accuracy and stability of blood pressure measurement.

[0083] In a possible implementation, the reinforcing rib 6023 may be disposed at a central position inside the protruding airbag layer 602. For example, as shown in Fig. 16a, the reinforcing rib 6023 may be disposed at a central portion of the inner wall of the sub-airbag of the protruding airbag layer. Because the reinforcing rib 6023 is disposed at a central portion of the inner wall of the sub-airbag, it is possible to restrict the inflation of the central portion of the sub-airbag to some extent, reduce the inflation height difference between the central portion and the ends of the sub-airbag, increase the effective pressure area, and improve the accuracy and stability of blood pressure measurement.

[0084] In another possible implementation, the reinforcing rib 6023 may alternatively be positioned at another location inside the airbag wall of the sub-airbag, for example, the reinforcing rib 6023 may be positioned as shown in Figure 16b.

[0085] The thickness of the airbag wall affects the inflation of the airbag to a certain extent. For example, a thick airbag wall imposes a certain restriction on the inflation of the airbag to a certain extent. As a result, when comparing a position with a thick airbag wall with a position with a thin airbag wall in the same airbag, the position with the thin airbag wall will have a better inflation effect. Based on this, the thickness of the airbag wall of the airbag assembly can be designed based on actual requirements to further improve the shape of the inflated airbag.

[0086] In a possible implementation, the inflating airbag layer 601 or the protruding airbag layer 602 may have an airbag wall with a non-uniform thickness. For example, the airbag wall may be designed to be thicker in a portion where inflation suppression is expected (low inflation height) and thinner in a portion where a good inflation effect is expected (high inflation height). For example, the thickness of the airbag wall near the center of the inflating airbag layer 601 may be set to be greater than the thickness of the airbag wall near the press-fit portion of the inflating airbag layer 601, and / or the thickness of the airbag wall of a first sub-airbag near the center of the inflating airbag layer 601 may be set to be greater than the thickness of the airbag wall of a second sub-airbag away from the center of the inflating airbag layer 602, and / or the thickness of the airbag wall of the sub-airbag of the protruding airbag layer 602 may be designed to be greater near the center than the thickness of the airbag wall away from the center of the sub-airbag.

[0087] In a possible implementation, the airbag wall thickness of the protruding airbag layer 602 can be set to be smaller than the airbag wall thickness of the inflating airbag layer 601. In this way, during the process of inflating the airbag assembly, the protruding airbag layer can achieve a better inflation effect than the inflating airbag layer, increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0088] In a possible implementation, the thickness of the airbag wall of the inflating airbag layer 601 close to the protruding airbag layer 602 can be set to be smaller than the thickness of the airbag wall of the inflating airbag layer 601 away from the protruding airbag layer 602. When the airbag assembly 6 is applied to the wrist strap of a wearable device, the protruding airbag layer is the layer closest to the user's skin surface, and the inflating airbag layer is the side away from the skin surface. Based on the above design, it is possible to ensure that the side closer to the user's skin surface achieves a good inflation effect, improving the accuracy and stability of blood pressure measurement. In addition, since the inflation of the airbag away from the user's skin surface is appropriately restricted, the inflation height of the entire inflated airbag can be reduced, improving wearing comfort.

[0089] Therefore, by appropriately designing the thickness of the airbag wall, the difference in height between the inflation height of the central part of the airbag assembly 6 and the inflation height of the part close to the press-fit part can be reduced, thereby increasing the effective pressure area and improving the accuracy and stability of blood pressure measurement.

[0090] 17, the shape of the inflated airbag assembly 6 can be modified by providing a linear winding on the surface of the airbag assembly 6. The linear winding can be disposed on the surface of the inflating airbag layer 601, or on the surface of the protruding airbag layer 602, or on both the surface of the inflating airbag layer 601 and the surface of the protruding airbag layer 602.

[0091] In a possible implementation, the linear winding effect can be achieved by winding a wire on the surface of the airbag assembly 6 based on a linear material (e.g., rope or adhesive tape). In another possible implementation, the linear winding effect can be achieved by arranging reinforcing ribs in a linear winding manner on the inside and / or outside of the airbag wall of the airbag assembly 6. This is not limited to the embodiments of the present application, provided that the expansion of the linear winding portion is suppressed to some extent when the airbag is inflated.

[0092] To further improve the shape of the inflated airbag, the airbag wall 6011 of the inflating airbag layer 601 can be further designed. As shown in FIG. 18(a), the airbag wall 6011 of the inflating airbag layer 601 includes a first airbag wall 60111 and a second airbag wall 60112. The first airbag wall 60111 is the airbag wall closest to the protruding airbag layer 602, and the second airbag wall 60112 is the airbag wall farther from the protruding airbag layer 602. The airbag wall 6011 is generally smooth and without creases. To further increase the inflation height of the portion of the inflating airbag layer 601 close to the press-fit portion, as shown in FIG. 18(b), a folding structure can be disposed on the airbag wall of the inflating airbag layer near the press-fit portion. In a possible implementation, the folding structure can be formed by a hot-press airbag wall method or other possible process methods. This is not limited to the embodiment of the present application.

[0093] An embodiment of the present application further provides a wearable device, which may be integrated with a blood pressure measurement function and configured to measure blood pressure. The wearable device may be an electronic device worn on the wrist, such as a watch or a wristband, a cuff-type blood pressure monitor (worn on the arm to measure blood pressure), a finger-type blood pressure monitor (worn on the finger to measure blood pressure), or another electronic device that measures blood pressure based on an airbag.

[0094] 19, the wearable device may include a watch body 7, a pressure sensor (not shown), and an airbag assembly 6 provided in an embodiment of the present application. The pressure sensor is configured to detect air pressure within the airbag assembly 6, and the pressure sensor is electrically connected to the watch body 7. The watch body 7 includes a display configured to display the blood pressure measurement result.

[0095] In one possible implementation, the watch body 7 and the airbag assembly 6 are detachably connected, allowing the airbag assembly 6 to be conveniently disassembled and replaced with a different wrist strap to meet various user wearing requirements and improve the user experience. In another possible implementation, the wearable device further includes a wrist strap, and the airbag assembly 6 may be disposed within the wrist strap. In another possible implementation, the airbag assembly 6 may alternatively be disposed on the surface of the wrist strap, in a layer close to the user's skin surface. During normal wear, the airbag assembly 6 does not need to be inflated, and the wrist strap may remain light and thin to ensure the wearer's comfort. When blood pressure measurement is required, the airbag assembly 6 may be inflated to apply effective pressure to the user's skin surface.

[0096] The above description is only an arbitrary embodiment of the present disclosure, but is not intended to limit the present disclosure. Any modification, equivalent replacement or improvement made without departing from the principle of the present disclosure should fall within the protection scope of the present disclosure.

Claims

1. an airbag assembly, the airbag assembly including an inflating airbag layer and a protruding airbag layer; the protruding airbag layer is disposed on a surface of the inflating airbag layer, the protruding airbag layer being an independent layer whose interior is partially bounded by the outer surface of the inflating airbag layer, and a connected first air passage is disposed between the protruding airbag layer and the inflating airbag layer and configured to circulate air between the inflating airbag layer and the protruding airbag layer; the protruding airbag layer includes a plurality of sub-airbags, the plurality of sub-airbags including a first sub-airbag and a second sub-airbag, the first sub-airbag being disposed closer to a center of the inflatable airbag layer than the second sub-airbag, and the volume of an inflation cavity of the first sub-airbag being smaller than the volume of an inflation cavity of the second sub-airbag; an airbag assembly, wherein the inflatable airbag layers include a first inflatable airbag layer and a second inflatable airbag layer stacked together, a connected second air passageway disposed between the first inflatable airbag layer and the second inflatable airbag layer and configured to circulate air between the first inflatable airbag layer and the second inflatable airbag layer, the second air passageway having a bar-like structure, and a separating rib disposed in the second air passageway, the separating rib dividing the second air passageway into a plurality of sub-air passageways.

2. 2. The airbag assembly according to claim 1, wherein the second air passage is disposed in a central portion of the inflating airbag layer, a ratio of a width of the second air passage to a width of the inflating airbag layer is greater than 1:10, the width of the inflating airbag layer is determined based on a length of a shorter side of the inflating airbag layer, and a difference between a distance from the second air passage to a longer side of the inflating airbag layer and a distance from the second air passage to the shorter side of the inflating airbag layer is within a predetermined range.

3. 2. The airbag assembly of claim 1, wherein the length of the sub-air passage is less than 30 mm, and the ratio of the length of the sub-air passage to the length of the separating rib is 2 or greater and less than 8.

4. 2. The airbag assembly of claim 1, wherein the first air passage is configured in a bar-like configuration and a separating rib is disposed in the first air passage, the separating rib dividing the first air passage into a plurality of sub-air passages.

5. The airbag assembly of claim 1 , wherein a reinforcing rib is disposed on an inner wall of the inflating airbag layer or an inner wall of the protruding airbag layer.

6. 6. The airbag assembly of claim 5, wherein a reinforcing rib is disposed in a central portion of an inner wall of the inflating airbag layer or in a central portion of an inner wall of at least one of the sub-airbags.

7. 10. The airbag assembly of claim 1, wherein the airbag wall thickness of the protruding airbag layer is less than the airbag wall thickness of the inflating airbag layer.

8. 2. The airbag assembly of claim 1, wherein a thickness of an airbag wall of the inflating airbag layer closer to the protruding airbag layer is less than a thickness of an airbag wall of the inflating airbag layer away from the protruding airbag layer.

9. 10. The airbag assembly of claim 1, wherein the airbag wall thickness of the inflating airbag layer or the airbag wall thickness of the protruding airbag layer is not uniform.

10. a thickness of the airbag wall near the center of the inflating airbag layer is greater than a thickness of the airbag wall away from the center of the inflating airbag layer; or The thickness of the airbag wall of the first sub-airbag is greater than the thickness of the airbag wall of the second sub-airbag, or 10. The airbag assembly of claim 9, wherein the plurality of sub-airbags includes a third sub-airbag, and wherein an airbag wall thickness near a center of the third sub-airbag is greater than an airbag wall thickness away from the center of the third sub-airbag.

11. 2. The airbag assembly of claim 1, wherein the volumes of the inflation cavities of the plurality of sub-airbags gradually increase in a direction from a position near a center of the inflating airbag layer to a position away from the center of the inflating airbag layer.

12. 10. The airbag assembly of claim 1, wherein the inflating airbag layer includes a fold structure disposed on the airbag wall proximate the press-fit.

13. the plurality of sub-airbags include a fourth sub-airbag and a fifth sub-airbag adjacent to each other, a connected air passage disposed between the fourth sub-airbag and the fifth sub-airbag and configured to circulate air between the fourth sub-airbag and the fifth sub-airbag; 2. The airbag assembly according to claim 1, wherein the plurality of sub-airbags further includes a sixth sub-airbag adjacent to the fourth sub-airbag, and wherein no connected air passage is disposed between the fourth sub-airbag and the sixth sub-airbag.

14. The sub-airbag has a rod-shaped structure, a rectangular structure, a diamond-shaped structure, or a circular structure, 10. The airbag assembly of claim 1, wherein an air inlet is disposed in the inflating airbag layer, the air inlet communicating an inflation cavity of the inflating airbag layer with ambient air.

15. A wearable device comprising a watch body, a pressure sensor, and an airbag assembly according to any one of claims 1 to 14, A wearable device, wherein the pressure sensor is configured to detect air pressure within the airbag assembly, and the pressure sensor is electrically connected to the watch body.

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