AIRBAG OF ELECTRONIC BLOOD PRESSURE MONITOR AND ELECTRONIC BLOOD PRESSURE MONITOR

An airbag of an electronic blood pressure monitor is provided. The airbag includes an outer wall and at least one connection wall; the outer wall includes a first wall, a peripheral side wall, and a second wall; the first wall and the second wall are disposed opposite to each other; the peripheral side wall is connected to a periphery of the first wall and a periphery of the second wall; the first wall, the side wall, and the second wall form an air chamber; the at least one connection wall is located in the air chamber; each connection wall is connected to at least two of the peripheral side wall, the first wall, and the second wall; and each connection wall is tensed when the airbag is in an expanded state. This application further provides an electronic blood pressure monitor including the airbag.

TECHNICAL FIELD

This application relates to the field of medical devices, and in particular, to an airbag of an electronic blood pressure monitor and an electronic blood pressure monitor.

BACKGROUND

An electronic blood pressure monitor is a medical device that measures blood pressure based on an indirect blood pressure measurement principle by using electronic technologies. Product portability is improved because of miniaturization of the electronic blood pressure monitor, and therefore the electronic blood pressure monitor becomes suitable for household use and meets a daily requirement of a family for blood pressure measurement. However, blood pressure measurement accuracy of a miniaturized electronic blood pressure monitor is low.

SUMMARY

This application provides an airbag of an electronic blood pressure monitor and an electronic blood pressure monitor, to improve blood pressure measurement accuracy.

According to a first aspect, this application provides an airbag of an electronic blood pressure monitor. The airbag includes an outer wall and at least one connection wall, where the outer wall includes a first wall, a peripheral side wall, and a second wall; the first wall and the second wall are disposed opposite to each other; the peripheral side wall is connected to a periphery of the first wall and a periphery of the second wall; the first wall, the peripheral side wall, and the second wall form an air chamber; the at least one connection wall is located in the air chamber; each connection wall is connected to at least two of the peripheral side wall, the first wall, and the second wall; and each connection wall is tensed when the airbag is in an expanded state.

The electronic device may include a processing module, an air pump, and a barometric pressure sensor. Both the air pump and the barometric pressure sensor communicate with the airbag. The air pump is configured to inflate the airbag, and the barometric pressure sensor is configured to collect barometric pressure of air in the airbag. A blood pressure measurement principle may be as follows. The air pump inflates the airbag, so that the airbag expands and compresses a blood vessel. When the airbag expands to a specific extent, the blood vessel is compressed by the airbag and then closes, so that a blood flow is blocked. When the blood flow is completely blocked, the airbag is controlled to deflate. In this case, the blood vessel generates a vibration waveform. The vibration waveform may cause air oscillation in the airbag, and an air oscillation waveform is related to the vibration waveform of the blood vessel. The barometric pressure sensor communicating with the airbag can collect an air oscillation waveform signal, and send the air oscillation waveform signal to the processing module. The processing module processes the oscillation waveform signal according to a built-in algorithm, and can calculate a blood pressure value.

In a natural state, the airbag may be approximately a flat strip-shaped bag, and the airbag may be wrapped around human skin to form an annular area with a specific width. The airbag has a length direction, a width direction, and a thickness direction. When the airbag is wrapped around the human skin, a contour of the airbag that originally extends along the length direction surrounds the human skin. The width direction is a width direction of the annular area. The thickness direction is a direction from the human skin to the airbag and an opposite direction. The airbag may be made of soft, deformable, and non-extendable materials.

The first wall and the second wall are respectively located at two opposite ends in the thickness direction. When the airbag is in use, the second wall may face the human skin, and the first wall may face away from the human skin. The peripheral side wall may be separated from the first wall or the second wall. When the airbag is formed, the peripheral side wall is “sewn” with the first wall and the second wall, and there is a “seam” between the peripheral side wall and each of the first wall and the second wall. Alternatively, the peripheral side wall may be connected to the first wall and the second wall, and the peripheral side wall smoothly transits to both the first wall and the second wall without “seams”. There is at least one connection wall, and a single connection wall may be connected between the first wall and the second wall, between the first wall and the peripheral side wall, or between the second wall and the peripheral side wall, or connected to the first wall, the peripheral side wall, and the second wall simultaneously. Connection positions of different connection walls may be the same or different.

When the airbag is in the expanded state, the outer wall and all connection walls of the airbag are tensed. Because the connection wall can pull a corresponding outer wall of the airbag inward when the connection wall is tensed, outward protrusion of the corresponding outer wall is reduced or avoided, and an outline of an expanded airbag can be optimized. In this way, air in the airbag can be pressed more toward the second wall, pressure is more concentrated on the blood vessel, and an effective compression area of the airbag on the blood vessel is increased. As a result, a degree of compression-caused closure of the blood vessel is improved, and blood pressure measurement accuracy is further improved.

In an embodiment, the peripheral side wall includes a first side wall and a second side wall that are opposite to each other; the at least one connection wall includes a first connection wall and a second connection wall; the first connection wall is connected to the first side wall and the first wall; one end of the second connection wall is connected to the second side wall; and an opposite end of the second connection wall is connected to the first wall or the second side wall.

The first side wall and the second side wall may be respectively located at two opposite ends in the width direction, and both are connected to the periphery of the first wall and the periphery of the second wall. The first side wall and the second side wall may be respectively located at two opposite ends in the length direction. When the airbag is in the expanded state, because the first side wall is pulled by the first connection wall, outward protrusion of the first side wall is suppressed. Similarly, the second side wall is pulled by the second connection wall. Therefore, outward protrusion of the second side wall is suppressed. The first wall may be pulled by both the first connection wall and the second connection wall, and therefore outward protrusion of the first wall is suppressed; or the first wall is pulled by the first connection wall, and the second wall is pulled by the second connection wall, and therefore outward protrusion of the first wall and the second wall is suppressed. In this structure, air in the airbag can be pressed more toward the second wall, pressure is more concentrated on the blood vessel, and an effective compression area of the airbag on the blood vessel is increased. As a result, a degree of compression-caused closure of the blood vessel is improved, and blood pressure measurement accuracy is further improved. In addition, after the airbag is deflated, the first side wall at one end in the width direction (or the length direction) of the airbag is pulled inward by the first connection wall, and the second side wall at the other end in the width direction (or the length direction) of the airbag is pulled inward by the second connection wall, so that the first side wall and the second side wall do not extend. Therefore, the airbag does not squeeze outward, and product aesthetics and user experience are not affected.

In an embodiment, the peripheral side wall includes a first side wall and a second side wall that are opposite to each other; the at least one connection wall includes a first connection wall and a second connection wall; the first connection wall is connected to the first side wall and the first wall; and the second connection wall is connected to the first side wall and the second wall. Because the first side wall, the first wall, and the second wall are pulled and in limited positions, blood pressure measurement accuracy can be improved. In addition, the first side wall does not extend after the airbag deflates, so that the airbag does not squeeze outward, and product aesthetics and user experience are not affected.

In an embodiment, the at least one connection wall includes a third connection wall and a fourth connection wall; the third connection wall is connected to the first side wall and the second wall; and the fourth connection wall is connected to the second side wall and the second wall. By using the airbag structure, blood pressure measurement accuracy can be improved. In addition, the airbag does not extend after deflating, so that the airbag does not squeeze outward, and product aesthetics and user experience are not affected.

In an embodiment, each connection wall has a first end, a middle part, and a second end, where the middle part is between the first end and the second end, the first end is connected to the first wall, the middle part is connected to the peripheral side wall, and the second end is connected to the second wall. The connection walls connect the first wall, the peripheral side wall, and the second wall simultaneously, so that the blood pressure measurement accuracy can be improved by using a simple structure, and a technical effect that the airbag does not extend after deflating can be ensured. The airbag of this kind is simple in design and easy to manufacture and produce massively.

In an embodiment, each connection wall has pleats, and the pleats are in a stretched state when the connection wall is tensed. A pleat structure can provide a sufficient deformation margin, and switching of the first connection wall between a loosened state and a tensed state can be implemented.

In an embodiment, the at least one connection wall and the outer wall form different chambers, and adjacent chambers communicate. This design allows air to flow between the chambers to ensure the normal inflation and deflation of the airbag, so that an operating need can be met.

In an embodiment, a periphery of each connection wall is connected to the outer wall, each connection wall is provided with an air hole, and adjacent chambers communicate through the air hole. The periphery of each connection wall is connected to the outer wall of the airbag. This structure can enhance structure strength of the connection wall, and ensure pulling force of the connection wall. This helps optimize the outline of the inflated airbag, so that the blood pressure measurement accuracy can be improved. In this design, each connection wall partitions the air chamber. Therefore, the air hole is provided to implement interconnection between the chambers of the air chamber, and ensure normal inflation and deflation of the airbag.

In an embodiment, each connection wall is connected to a middle part of the first wall or a middle part of the second wall. When the connection wall is connected to the first wall, the connection wall is connected to the middle part of the first wall. Alternatively, when the connection wall is connected to the second wall, the connection wall is connected to the middle part of the second wall. A center of the first wall or the second wall may be determined. An area between two sides of the center in the width direction may be referred to as a middle part of the first wall or the second wall in the width direction. The area between the two sides may be mirror-symmetric with the center being a point of symmetry. The connection wall is connected to the middle part of the first wall or the second wall, so that the pulling force may be exerted on a position that may be most protruding on the first wall or the second wall, to ensure that the first wall or the second wall generally does not protrude outward. In this way, air in the airbag can be pressed more toward the second wall, pressure is more concentrated on the blood vessel, and the effective compression area of the airbag on the blood vessel is increased. In this way, the degree of compression-caused closure of the blood vessel can be improved, and therefore the blood pressure measurement accuracy can be improved.

According to a second aspect, this application provides an electronic blood pressure monitor, including an air pump, a barometric pressure sensor, and an airbag, where the airbag includes an air nozzle connected to the air chamber, and both the air pump and the barometric pressure sensor communicate with the air chamber through the air nozzle. The air nozzle may be disposed on any of the foregoing outer walls. Because a collection wall of the airbag can pull an outer wall corresponding to the airbag inward when the collection wall is tensed, air in the airbag can be pressed more toward a second wall, pressure is more concentrated on a blood vessel, and an effective compression area of the airbag on the blood vessel is increased. As a result, a degree of compression-caused closure of the blood vessel is improved, and blood pressure measurement accuracy is improved by using the electronic blood pressure monitor having the airbag.

In an embodiment, the air nozzle includes an air intake nozzle and a measurement air nozzle, the air pump communicates with the air chamber through the air intake nozzle, and the barometric pressure sensor communicates with the air chamber through the measurement air nozzle. The two air nozzles are disposed to perform inflation and measurement, so that it can be ensured that each system of the electronic blood pressure monitor operates without interfering with each other, and working reliability of the electronic blood pressure monitor is ensured.

In an embodiment, the electronic blood pressure monitor is a sphygmomanometer, a wrist blood pressure monitor, or a wearable blood pressure monitor. An electronic blood pressure monitor of this kind is highly portable and suitable for household use.

DESCRIPTION OF EMBODIMENTS

The following embodiment of this application provides an electronic blood pressure monitor, including but not limited to including a sphygmomanometer10shown inFIG.1, a wrist blood pressure monitor20shown inFIG.2, or a blood pressure watch30shown inFIG.3. Specific descriptions are provided below.

As shown inFIG.1, the sphygmomanometer10may include a main unit11, a hose12, and a cuff13, where the hose12is connected to the main unit11and the cuff13. The main unit11may include a processing module, a display screen, an air pump, and a barometric pressure sensor. The cuff13can be wrapped around and bound to an arm of a human body, and an airbag is packaged in the cuff13. An air pump may inflate the airbag through the hose12, so that the airbag expands and compresses a blood vessel. When the airbag expands to a specific extent, the blood vessel is compressed by the airbag and then closes, so that a blood flow is blocked. When the blood flow is completely blocked, the airbag is controlled to deflate. In this case, the blood vessel generates a vibration waveform. The vibration waveform may cause air oscillation in the airbag, and an air oscillation waveform is related to the vibration waveform of the blood vessel. The barometric pressure sensor communicating with the airbag can collect an air oscillation waveform signal, and send the air oscillation waveform signal to the processing module. The processing module processes the oscillation waveform signal according to a built-in algorithm (for example, the built-in algorithm includes an amplitude coefficient method), and can calculate a blood pressure value. The processing module can further control the display screen to display the blood pressure value.

FIG.2schematically shows a main unit21and a wrist band23of a wrist blood pressure monitor20. The wrist band23can be wrapped around and bound to a wrist of a human body, and an airbag is packaged in the wrist band23. The main unit21may include a processing module, a display screen, an air pump, and a barometric pressure sensor. Both the air pump and the barometric pressure sensor communicate with the airbag. A blood pressure measurement principle of the wrist blood pressure monitor20is the same as that described above, and details are not described herein again.

FIG.3schematically shows a main unit31and a watch band33of a blood pressure watch30. The watch band33can be wrapped around and bound to a wrist of a human body, and an airbag is packaged in the watch band33. The main unit31may include a processing module, a display screen, an air pump, and a barometric pressure sensor. Both the air pump and the barometric pressure sensor communicate with the airbag. A blood pressure measurement principle of the blood pressure watch30is the same as that described above, and details are not described herein again. In another embodiment, in addition to the blood pressure watch30, the electronic blood pressure monitor may alternatively be another wearable blood pressure monitor (a portable blood pressure monitor suitable for long-term wearing), for example, a blood pressure wristband.

The following describes in detail a structure of the airbag of the electronic device.

As shown inFIG.4, in Embodiment 1, in a natural state, the airbag34may be approximately a flat strip-shaped bag, and the airbag34may be wrapped around an arm or a wrist to form an annular area with a specific width. The airbag34has a length direction, a width direction, and a thickness direction. When the airbag34is wrapped around the arm or the wrist, a contour of the airbag34that originally extends along the length direction surrounds the arm or the wrist. The width direction is a width direction of the annular area. The thickness direction is a direction from human skin to the airbag34and an opposite direction (for example, from a perspective shown inFIG.6, the thickness direction is a vertical direction). The airbag may be made of soft, deformable, and non-extendable materials, such as thermoplastic polyurethane (TPU) or polyvinyl chloride (PVC).

As shown inFIG.4toFIG.6, the airbag34has an outer wall, and the outer wall may include a first wall37, a second wall40, a first side wall351, and a second side wall352. The airbag34may further include a first connection wall392and a second connection wall391.

The first wall37and the second wall40are disposed opposite to each other, and the first wall37and the second wall40are respectively located at two opposite ends in the thickness direction. When the airbag34is in use, the second wall40may face human skin, and the first wall37may face away from human skin. Shapes of the first wall37and the second wall40are not limited. For example, the first wall37and the second wall40may be approximately in a shape of a flat strip. An air intake nozzle36and a measurement air nozzle38may be disposed on the first wall37. An air pump communicates with the air intake nozzle36, and a barometric pressure sensor communicates with the measurement air nozzle38.

In another embodiment, the air intake nozzle36and the measurement air nozzle38are independently disposed, and respective positions of the air intake nozzle36and the measurement air nozzle38may be determined based on a requirement for the product. Positions of the air intake nozzle36and the measurement air nozzle38are not limited to a same wall. For example, one of the air intake nozzle36and the measurement air nozzle38may be disposed on the first side wall351described below, and the other is disposed on the second side wall352described below; or both the air intake nozzle36and the measurement air nozzle38are disposed on the first side wall351or the second side wall352. Alternatively, only one air nozzle may be disposed on the first wall37, and both the air pump and the barometric pressure sensor communicate with the air nozzle. Alternatively, the air nozzle may be disposed in another position, for example, a peripheral side wall described below. The barometric pressure sensor may alternatively be disposed at the measurement air nozzle38or the air nozzle, instead of being included in the main unit.

The first side wall351and the second side wall352are disposed opposite to each other, and the first side wall351and the second side wall352are located at two opposite ends in the width direction. Both the first side wall351and the second side wall352are connected to a periphery of the first wall37and a periphery of the second wall40.

As shown inFIG.5, the airbag34may further include a side wall41located at one end in the length direction, and a side wall (inFIG.5, the side wall is cut off from a sectional perspective and is therefore not shown) that is opposite to the side wall41and located at the other end in the length direction. Both the side wall41and the side wall are connected to the periphery of the first wall37and the periphery of the second wall40. The side wall41, the first side wall351, the side wall, and the second side wall352are connected to form a peripheral side wall of the airbag34. The peripheral side wall may be separated from the first wall37or the second wall40. When the airbag34is formed, the peripheral side wall is “sewn” with the first wall37and the second wall40, and there is a “seam” between the peripheral side wall and each of the first wall37and the second wall40. Alternatively, the peripheral side wall may be connected to the first wall37and the second wall40, and the peripheral side wall smoothly transits to both the first wall37and the second wall40without “seams”.

Refer toFIG.4andFIG.6. The first wall37, the peripheral side wall, and the second wall40form an air chamber S. The air intake nozzle36and the air chamber S communicate, so that the air pump can inflate the air chamber S. The measurement air nozzle38and the air chamber S also communicate, so that the barometric pressure sensor can collect an air oscillation waveform signal in the airbag34.

As shown inFIG.4toFIG.6, the first connection wall392may be approximately in a shape of a flat strip. The first connection wall392is located in the air chamber S, and is connected between the first side wall351and the first wall37. Two opposite ends of the first connection wall392in the length direction are also respectively connected to the side wall41and the side wall. In other words, a periphery of the first connection wall392is connected to the outer wall of the airbag34.

A connection position of the first connection wall392on each outer wall may be in a middle part of a corresponding outer wall. As shown inFIG.4andFIG.6, the first connection wall392may be connected to a middle part of the first side wall351in the thickness direction. A center of the first side wall351may be determined. An area between two sides of the center in the thickness direction may be referred to as a middle part in the thickness direction. The area between the two sides may be mirror-symmetric with the center being a point of symmetry, and a width of an area on each side may be set based on a requirement. The first connection wall392may be connected to a middle part of the first wall37in the width direction. Similarly, a center of the first wall37may be determined. An area between two sides of the center in the width direction may be referred to as a middle part in the width direction. The area between the two sides may be mirror-symmetric with the center being a point of symmetry, and a width of an area on each side may be set based on a requirement. In another embodiment, the connection position of the first connection wall392on each outer wall may be determined according to a requirement for the product, and is not limited to a middle part of a corresponding outer wall.

The periphery of the first connection wall392is connected to an outer wall of the airbag34, to divide the air chamber S into different chambers. For example, as shown inFIG.6, the first connection wall392may divide a chamber S1from the air chamber S.

As shown inFIG.4toFIG.6, the second connection wall391may be approximately in a shape of a flat strip. The second connection wall391is located in the air chamber S, and is connected between the second side wall352and the first wall37. Two opposite ends of the second connection wall391in the length direction are also respectively connected to the side wall41and the side wall. In other words, a periphery of the second connection wall391is connected to the outer wall of the airbag34.

A connection position of the second connection wall391on each outer wall may be in a middle part of a corresponding outer wall. For example, as shown inFIG.6, the second connection wall391may be connected to a middle part of the second side wall352in the thickness direction, and the second connection wall391may be connected to a middle part of the first wall37in the width direction. In another embodiment, the connection position of the second connection wall391on each outer wall may be determined according to a requirement for the product, and is not limited to a middle part of a corresponding outer wall.

The periphery of the second connection wall391is connected to an outer wall of the airbag34, to divide the air chamber S into different chambers. For example, as shown inFIG.6, the second connection wall391may divide a chamber S3from the air chamber S, and the second connection wall391and the first connection wall392may divide a chamber S2from the air chamber S. In other words, the air chamber S may be divided into the chamber S1, the chamber S2, and the chamber S3through the design of the first connection wall392and the second connection wall391.

Refer toFIG.4toFIG.6. To achieve communication between the different chambers, several air holes39amay be provided on both the first connection wall392and the second connection wall391, so that the airbag34can completely expand during inflation. The air holes39aare through holes. The air hole39aon the first connection wall392is used to achieve communication between the chamber S1and the chamber S2, and the air hole39aon the second connection wall391is used to achieve communication between the chamber S2and the chamber S3. A shape and a quantity of the air hole39ais not limited, and may be designed according to a requirement for the product.

Refer toFIG.4andFIG.7. In another embodiment, a difference from Embodiment 1 is that the first connection wall392is connected between the first wall37and the first side wall351, but both opposite ends of the first connection wall392in the length direction are not connected to the peripheral side wall of the airbag34, and there is a spacing G between the peripheral side wall and each of the opposite ends of the first connection wall392. For example, as shown inFIG.7, a right end of the first connection wall392in the length direction is not connected to the side wall41of the peripheral side wall, and there is a spacing G between the right end and the side wall41. In other words, only a part of the periphery of the first connection wall392is connected to the outer wall of the airbag34. Because the first connection wall392does not partition the air chamber in this case, the air hole may not be provided on the first connection wall392.

Refer toFIG.4andFIG.7. In another embodiment, the second connection wall391is connected between the first wall37and the second side wall352, but both opposite ends of the second connection wall391in the length direction are not connected to the sides of the airbag34, and there is a spacing G between the peripheral side wall and each of the opposite ends of the second connection wall391. For example, as shown inFIG.7, a right end of the second connection wall391in the length direction is not connected to the side wall41of the peripheral side wall, and there is a spacing G between the right end and the side wall41. In other words, only a part of the periphery of the second connection wall391is connected to the outer wall of the airbag34. Similarly, the air hole may not be provided on the second connection wall391.

Alternatively, in another embodiment, as shown inFIG.8, there may be several (for example, three) first connection walls392, the several first connection walls392are disposed side by side, and there is a spacing G between neighboring first connection walls392. Each first connection wall392is connected between the first wall37and the first side wall351, but at least one end in the length direction is not connected to the peripheral side wall of the airbag34. For example, the right end of a first connection wall392that is at the left end is not connected to the peripheral side wall of the airbag34, the left end of a first connection wall392that is at the right end is not connected to the peripheral side wall of the airbag34, and neither the left end nor the right end of a first connection wall392at the middle is connected to the peripheral side wall of the airbag34. Certainly,FIG.8is merely an example. For example, neither of opposite ends of each first connection wall392may be connected to the peripheral side wall of the airbag34. Because the first connection walls392do not partition the air chamber in this case, air holes may not be provided on the first connection walls392.

In another embodiment, as shown inFIG.8, there may also be several (for example, three) second connection walls391, the several second connection walls391are disposed side by side, and there is a spacing G between neighboring second connection walls391. Each second connection wall391is connected between the first wall37and the second side wall352, but at least one end in the length direction is not connected to the peripheral side wall of the airbag34. For example, the right end of a second connection wall391that is at the left end is not connected to the peripheral side wall of the airbag34, the left end of a second connection wall391that is at the right end is not connected to the peripheral side wall of the airbag34, and neither the left end nor the right end of a second connection wall391at the middle is connected to the peripheral side wall of the airbag34. Certainly,FIG.8is merely an example. For example, neither of opposite ends of each second connection wall391may be connected to the peripheral side wall of the airbag34. Because the second connection walls391do not partition the air chamber in this case, air holes may not be provided on the first connection walls392.

The airbag34inFIG.4toFIG.8is not inflated, and the foregoing outer walls, the first connection wall392, and the second connection wall391of the airbag34are all in a deflated state. As shown inFIG.9andFIG.10, during inflation of the airbag34, the foregoing outer walls, the first connection wall392, and the second connection wall391are all tensed. Being tensed is a state in which a shape is formed through tensing, and bending or deformation cannot be easily performed. Because the first side wall351is pulled by the first connection wall392, and a connection position of the first connection wall392on the first side wall351is in the middle of the first side wall351, the first side wall351generally does not protrude outward. Similarly, because the second side wall352is pulled by the second connection wall391, and a connection position of the second connection wall391on the second side wall352is in the middle of the second side wall352, the second side wall352generally does not protrude outward. The first wall37is pulled by both the first connection wall392and the second connection wall391, and a connection position of the first connection wall392on the first wall37and a connection position of the second connection wall391on the first wall37are in the middle of the first wall37. Therefore, the first wall37generally does not protrude outward. Because the second wall40is not pulled, the second wall40may slightly protrude outward.

FIG.11is a schematic diagram of a principle of compressing a blood vessel300in human tissue200when a conventional airbag100expands. Because the conventional airbag100has only an outer wall, when in an expanded state, the conventional airbag100forms an elliptical cross section, where a lower wall in contact with human skin protrudes outward and forms an arc. Such a geometric structure causes an effective compression length X1of the blood vessel300(a length of a closed part of the blood vessel300under compression) to be much less than a width X0of the conventional airbag100. Consequently, pressure exerted by the conventional airbag100on the blood vessel300is limited, and the blood vessel300cannot be completely compressed and closed. Therefore, blood pressure measurement accuracy is reduced.

In addition, as shown inFIG.12, after the conventional airbag100is deflated, two opposite ends of the conventional airbag100in the width direction loosen and extend. As a result, the conventional airbag100squeezes a cuff, a wristband, or a watchband, which not only affects appearance of the product, but also causes user discomfort.

On the contrary, as shown inFIG.13, because the airbag34in Embodiment 1 has the first connection wall392and the second connection wall391, an outline of an expanded airbag34can be optimized, and air in the airbag34is limited to flow to the first wall37, the first side wall351, and the second side wall352, so that the air can be pressed more toward the second wall40, and pressure is concentrated more on the blood vessel300. It can be learned by comparingFIG.13withFIG.11that an effective compression length X2of the blood vessel300inFIG.13is greater than the effective compression length X1inFIG.11. Because the pressure exerted by the airbag34on the blood vessel300is increased, a degree of compression-caused closure of the blood vessel300can be improved. In this case, the blood pressure measurement accuracy can be improved. In addition, as shown inFIG.6, after the airbag34in Embodiment 1 is deflated, the first side wall351at one end in the width direction of the airbag34is pulled inward by the first connection wall392, and the second side wall352at the other end in the width direction of the airbag34is pulled inward by the second connection wall391, so that the first side wall351and the second side wall352do not extend. Therefore, the airbag34does not squeeze the cuff, the wristband, or the watchband, and product aesthetics and user experience are not affected.

In another embodiment, the first connection wall392may be connected to the first side wall351and the second wall40, and/or the second connection wall391is connected to the second side wall352and the second wall40. Alternatively, either the first connection wall392or the second connection wall391may exist, and the first connection wall392or the second connection wall391may be connected to any two outer walls of the airbag.

As shown inFIG.14andFIG.15, in Embodiment 2, a difference from the foregoing Embodiment 1 is that one end of the second connection wall391is connected to the second side wall352, and the other end is connected to the second wall40. Because the second wall40is also pulled by the second connection wall391, outward protrusion of the second wall40during inflation of the airbag34can be suppressed, and the second wall40becomes flatter. In this case, an effective compression length X3of the blood vessel300is increased (the effective compression length X3may be greater than the foregoing effective compression length X2), and a compression area of the airbag34is increased. Therefore, the pressure exerted by the airbag34on the blood vessel300is further increased, the degree of compression-caused closure of the blood vessel300can be improved. In this case, the blood pressure measurement accuracy can be improved.

As shown inFIG.16andFIG.17, in Embodiment 3, a difference from the foregoing Embodiment 1 is that the first connection wall392is connected between the first wall37and the first side wall351, and the second connection wall391is connected between the first side wall351and the second wall40. One end of the first connection wall392and one end of the second connection wall391may intersect on the first side wall351, or may be separated from each other. Because the first wall37, the first side wall351, and the second wall40are all pulled and in limited positions, outward protrusion of the first wall37, the first side wall351, and the second wall40is suppressed when the airbag34expands. The second side wall352is not connected to the first connection wall392and the second connection wall391, and the second side wall352may slightly protrude outward. However, according to the foregoing principle, generally, air is still pressed more toward the second wall40in the airbag34, so that pressure is more concentrated on the blood vessel, and the degree of compression-caused closure of the blood vessel can be improved. In this way, the blood pressure measurement accuracy is improved. In addition, the first side wall351does not loosen and extend during deflation of the airbag34. Therefore, the first side wall351does not squeeze the cuff, the wristband, or the watchband, and product aesthetics is not affected.

As shown inFIG.18andFIG.19, in Embodiment 4, based on the solution of Embodiment 1, the airbag34may further include a third connection wall393. The third connection wall393is connected between the first side wall351and the second wall40. One end of the third connection wall393and one end of the first connection wall392may intersect on the first side wall351, or may be separated from each other. Because the first wall37, the second side wall352, the second wall40, and the first side wall351are all pulled and in limited positions, the outline of the expanded airbag34is further optimized, so that air can be pressed more toward the second wall40, and pressure is more concentrated on the blood vessel. This further improves the degree of compression-caused closure of the blood vessel and further improves the blood pressure measurement accuracy. In addition, during deflation of the airbag34, the first side wall351and the second side wall352do not extend. Therefore, the airbag34does not squeeze the cuff, the wristband, or the watchband, and product aesthetics and user experience are ensured.

As shown inFIG.20andFIG.21, in Embodiment 5, based on the solution of Embodiment 4, the airbag34may further include a fourth connection wall394. The fourth connection wall394is connected between the second side wall352and the second wall40. One end of the fourth connection wall394and one end of the second connection wall391may intersect on the second side wall352, or may be separated from each other. The other end of the fourth connection wall394and one end of the third connection wall393may be separated on the second wall40, or may intersect.

As shown inFIG.22andFIG.23, when the airbag34is inflated and expands, because the first wall37, the second side wall352, the second wall40, and the first side wall351are all pulled and in limited positions, the outline of the expanded airbag34is highly optimized, so that air can be pressed more toward the second wall40, and pressure is more concentrated on the blood vessel. This further improves the degree of compression-caused closure of the blood vessel and further improves the blood pressure measurement accuracy. In addition, during deflation of the airbag34, the first side wall351and the second side wall352do not extend. Therefore, the airbag34does not squeeze the cuff, the wristband, or the watchband, and product aesthetics and user experience are ensured.

As shown inFIG.24toFIG.26, in Embodiment 6, a difference from the foregoing embodiments is that the first connection wall392of the airbag34connects the first wall37, the first side wall351, and the second wall40, and the second connection wall391of the airbag34connects the first wall37, the second side wall352, and the second wall40. Details are as follows.

As shown inFIG.26, the first connection wall392may have several pleats (similar to a leaf of a folding fan). The first connection wall392may have a first end392a, a middle part392b, and a second end392c, and the middle part392bis connected between the first end392aand the second end392c. The first end392ais connected to the first wall37, the middle part392bis connected to the first side wall351, and the second end392cis connected to the second wall40. The second connection wall391may also have several pleats. The second connection wall391may have a first end391a, a middle part391b, and a second end391c, and the middle part391bis connected between the first end391aand the second end391c. The first end391ais connected to the first wall37, the middle part391bis connected to the second side wall352, and the second end391cis connected to the second wall40. In other embodiments, at least one of the first connection wall392and the second wall40may connect only the first wall37and the second wall40.

As shown inFIG.26, the first connection wall392and the second connection wall391are disposed in the air chamber of the airbag34, so that the air chamber can be divided into a chamber S4, a chamber S5, a chamber S6, a chamber S7, and a chamber S8. To achieve communication between the chamber S4and the chamber S8, air holes may be provided in an area of the first connection wall392between the first end392aand the middle part392b, an area of the first connection wall392between the middle part392band the second end392c, an area of the second connection wall391between the first end391aand the middle part391b, and an area of the second connection wall391between the middle part391band the second end391c.

As described above, in another embodiment, there may be one first connection wall392, or there may be several first connection walls392arranged side by side at intervals. At least one end of a single first connection wall392in the length direction may be spaced away from the peripheral side wall of the airbag34. In other words, at least a part of a periphery of the first connection wall392is not connected to the outer wall of the airbag34. Because the first connection wall392does not partition the air chamber in this case, the air holes may not be provided on the first connection wall392. The second connection wall391may have a design similar to that of the first connection wall392, and similarly, air holes may not be disposed on the second connection wall391.

As shown inFIG.27andFIG.28, when the airbag34is inflated and expands, pleats on the first connection wall392and the second connection wall391stretch, so that the first connection wall392and the second connection wall391are tensed. A pleat structure can provide a sufficient deformation margin, and switching of the first connection wall392between a loosened state and a tensed state can be implemented. In other embodiments, the pleats are not mandatory. For example, when the airbag34is deflated, the first connection wall392and the second connection wall391may naturally curl up.

Because the first wall37, the second side wall352, the second wall40, and the first side wall351are all pulled and in limited positions, the outline of the expanded airbag34is highly optimized, so that air can be pressed more toward the second wall40, and pressure is more concentrated on the blood vessel300. This further improves the degree of compression-caused closure of the blood vessel300and further improves the blood pressure measurement accuracy. In addition, during deflation of the airbag34, the first side wall351and the second side wall352do not extend. Therefore, the airbag34does not squeeze the cuff, the wristband, or the watchband, and product aesthetics and user experience are ensured.