Patent Description:
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. <CIT> discloses a cuff for a blood pressure monitor that has an air bag inflated/deflated as the air comes in/out. The air bag has an inner wall portion located on the inner side in the fitted state of the cuff and an outer wall portion located outer than the inner wall portion, and a side wall portion connecting side end portions of the inner and outer wall portions and folded inwards in the deflated state of the air bag to form a gusset at each side end portion of the air bag. A bonded portion is provided at a region of the air bag in its winding direction around the living body, for reducing expansion of the gusset formed by the side wall portion. Thus, occurrence of lateral displacement of the cuff is prevented, and a highly reliable blood pressure monitor of high performance can be obtained. <CIT> discloses a bladder incorporated in a cuff that includes an outer wall located at the outer side, an inner wall located at the inner side, side walls connected to both side ends of the outer wall and the inner wall in the wrapping direction, and folded inward of the bladder, and a joint connecting the side walls inside the bladder. A sphygmomanometer cuff is provided that can maintain the former configuration even when inflated or deflated without change in the width even if the bladder is inflated, and that does not dilate in the width direction when inflated.

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 the peripheral side wall and the first wall or to the peripheral side 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 implementation, 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 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 implementation, 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 implementation, 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 implementation, 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 implementation, 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 implementation, 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 implementation, 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 implementation, 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 implementation, 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 implementation, 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.

The following embodiment of this application provides an electronic blood pressure monitor, including but not limited to including a sphygmomanometer <NUM> shown in <FIG>, a wrist blood pressure monitor <NUM> shown in <FIG>, or a blood pressure watch <NUM> shown in <FIG>. Specific descriptions are provided below.

As shown in <FIG>, the sphygmomanometer <NUM> may include a main unit <NUM>, a hose <NUM>, and a cuff <NUM>, where the hose <NUM> is connected to the main unit <NUM> and the cuff <NUM>. The main unit <NUM> may include a processing module, a display screen, an air pump, and a barometric pressure sensor. The cuff <NUM> can be wrapped around and bound to an arm of a human body, and an airbag is packaged in the cuff <NUM>. An air pump may inflate the airbag through the hose <NUM>, 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> schematically shows a main unit <NUM> and a wrist band <NUM> of a wrist blood pressure monitor <NUM>. The wrist band <NUM> can be wrapped around and bound to a wrist of a human body, and an airbag is packaged in the wrist band <NUM>. The main unit <NUM> may 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 monitor <NUM> is the same as that described above, and details are not described herein again.

<FIG> schematically shows a main unit <NUM> and a watch band <NUM> of a blood pressure watch <NUM>. The watch band <NUM> can be wrapped around and bound to a wrist of a human body, and an airbag is packaged in the watch band <NUM>. The main unit <NUM> may 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 watch <NUM> is the same as that described above, and details are not described herein again. In another embodiment, in addition to the blood pressure watch <NUM>, 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 in <FIG>, in Embodiment <NUM>, in a natural state, the airbag <NUM> may be approximately a flat strip-shaped bag, and the airbag <NUM> may be wrapped around an arm or a wrist to form an annular area with a specific width. The airbag <NUM> has a length direction, a width direction, and a thickness direction. When the airbag <NUM> is wrapped around the arm or the wrist, a contour of the airbag <NUM> that 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 airbag <NUM> and an opposite direction (for example, from a perspective shown in <FIG>, 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 in <FIG>, the airbag <NUM> has an outer wall, and the outer wall may include a first wall <NUM>, a second wall <NUM>, a first side wall <NUM>, and a second side wall <NUM>. The airbag <NUM> may further include a first connection wall <NUM> and a second connection wall <NUM>.

The first wall <NUM> and the second wall <NUM> are disposed opposite to each other, and the first wall <NUM> and the second wall <NUM> are respectively located at two opposite ends in the thickness direction. When the airbag <NUM> is in use, the second wall <NUM> may face human skin, and the first wall <NUM> may face away from human skin. Shapes of the first wall <NUM> and the second wall <NUM> are not limited. For example, the first wall <NUM> and the second wall <NUM> may be approximately in a shape of a flat strip. An air intake nozzle <NUM> and a measurement air nozzle <NUM> may be disposed on the first wall <NUM>. An air pump communicates with the air intake nozzle <NUM>, and a barometric pressure sensor communicates with the measurement air nozzle <NUM>.

In another embodiment, the air intake nozzle <NUM> and the measurement air nozzle <NUM> are independently disposed, and respective positions of the air intake nozzle <NUM> and the measurement air nozzle <NUM> may be determined based on a requirement for the product. Positions of the air intake nozzle <NUM> and the measurement air nozzle <NUM> are not limited to a same wall. For example, one of the air intake nozzle <NUM> and the measurement air nozzle <NUM> may be disposed on the first side wall <NUM> described below, and the other is disposed on the second side wall <NUM> described below; or both the air intake nozzle <NUM> and the measurement air nozzle <NUM> are disposed on the first side wall <NUM> or the second side wall <NUM>. Alternatively, only one air nozzle may be disposed on the first wall <NUM>, 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 nozzle <NUM> or the air nozzle, instead of being included in the main unit.

The first side wall <NUM> and the second side wall <NUM> are disposed opposite to each other, and the first side wall <NUM> and the second side wall <NUM> are located at two opposite ends in the width direction. Both the first side wall <NUM> and the second side wall <NUM> are connected to a periphery of the first wall <NUM> and a periphery of the second wall <NUM>.

As shown in <FIG>, the airbag <NUM> may further include a side wall <NUM> located at one end in the length direction, and a side wall (in <FIG>, the side wall is cut off from a sectional perspective and is therefore not shown) that is opposite to the side wall <NUM> and located at the other end in the length direction. Both the side wall <NUM> and the side wall are connected to the periphery of the first wall <NUM> and the periphery of the second wall <NUM>. The side wall <NUM>, the first side wall <NUM>, the side wall, and the second side wall <NUM> are connected to form a peripheral side wall of the airbag <NUM>. The peripheral side wall may be separated from the first wall <NUM> or the second wall <NUM>. When the airbag <NUM> is formed, the peripheral side wall is "sewn" with the first wall <NUM> and the second wall <NUM>, and there is a "seam" between the peripheral side wall and each of the first wall <NUM> and the second wall <NUM>. Alternatively, the peripheral side wall may be connected to the first wall <NUM> and the second wall <NUM>, and the peripheral side wall smoothly transits to both the first wall <NUM> and the second wall <NUM> without "seams".

Refer to <FIG> and <FIG>. The first wall <NUM>, the peripheral side wall, and the second wall <NUM> form an air chamber S. The air intake nozzle <NUM> and the air chamber S communicate, so that the air pump can inflate the air chamber S. The measurement air nozzle <NUM> and the air chamber S also communicate, so that the barometric pressure sensor can collect an air oscillation waveform signal in the airbag <NUM>.

As shown in <FIG>, the first connection wall <NUM> may be approximately in a shape of a flat strip. The first connection wall <NUM> is located in the air chamber S, and is connected between the first side wall <NUM> and the first wall <NUM>. Two opposite ends of the first connection wall <NUM> in the length direction are also respectively connected to the side wall <NUM> and the side wall. In other words, a periphery of the first connection wall <NUM> is connected to the outer wall of the airbag <NUM>.

A connection position of the first connection wall <NUM> on each outer wall may be in a middle part of a corresponding outer wall. As shown in <FIG> and <FIG>, the first connection wall <NUM> may be connected to a middle part of the first side wall <NUM> in the thickness direction. A center of the first side wall <NUM> may 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 wall <NUM> may be connected to a middle part of the first wall <NUM> in the width direction. Similarly, a center of the first wall <NUM> may 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 wall <NUM> on 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 wall <NUM> is connected to an outer wall of the airbag <NUM>, to divide the air chamber S into different chambers. For example, as shown in <FIG>, the first connection wall <NUM> may divide a chamber S1 from the air chamber S.

As shown in <FIG>, the second connection wall <NUM> may be approximately in a shape of a flat strip. The second connection wall <NUM> is located in the air chamber S, and is connected between the second side wall <NUM> and the first wall <NUM>. Two opposite ends of the second connection wall <NUM> in the length direction are also respectively connected to the side wall <NUM> and the side wall. In other words, a periphery of the second connection wall <NUM> is connected to the outer wall of the airbag <NUM>.

A connection position of the second connection wall <NUM> on each outer wall may be in a middle part of a corresponding outer wall. For example, as shown in <FIG>, the second connection wall <NUM> may be connected to a middle part of the second side wall <NUM> in the thickness direction, and the second connection wall <NUM> may be connected to a middle part of the first wall <NUM> in the width direction. In another embodiment, the connection position of the second connection wall <NUM> on 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 wall <NUM> is connected to an outer wall of the airbag <NUM>, to divide the air chamber S into different chambers. For example, as shown in <FIG>, the second connection wall <NUM> may divide a chamber S3 from the air chamber S, and the second connection wall <NUM> and the first connection wall <NUM> may divide a chamber S2 from the air chamber S. In other words, the air chamber S may be divided into the chamber S1, the chamber S2, and the chamber S3 through the design of the first connection wall <NUM> and the second connection wall <NUM>.

Refer to <FIG>. To achieve communication between the different chambers, several air holes 39a may be provided on both the first connection wall <NUM> and the second connection wall <NUM>, so that the airbag <NUM> can completely expand during inflation. The air holes 39a are through holes. The air hole 39a on the first connection wall <NUM> is used to achieve communication between the chamber S1 and the chamber S2, and the air hole 39a on the second connection wall <NUM> is used to achieve communication between the chamber S2 and the chamber S3. A shape and a quantity of the air hole 39a is not limited, and may be designed according to a requirement for the product.

Refer to <FIG> and <FIG>. In another embodiment, a difference from Embodiment <NUM> is that the first connection wall <NUM> is connected between the first wall <NUM> and the first side wall <NUM>, but both opposite ends of the first connection wall <NUM> in the length direction are not connected to the peripheral side wall of the airbag <NUM>, and there is a spacing G between the peripheral side wall and each of the opposite ends of the first connection wall <NUM>. For example, as shown in <FIG>, a right end of the first connection wall <NUM> in the length direction is not connected to the side wall <NUM> of the peripheral side wall, and there is a spacing G between the right end and the side wall <NUM>. In other words, only a part of the periphery of the first connection wall <NUM> is connected to the outer wall of the airbag <NUM>. Because the first connection wall <NUM> does not partition the air chamber in this case, the air hole may not be provided on the first connection wall <NUM>.

Refer to <FIG> and <FIG>. In another embodiment, the second connection wall <NUM> is connected between the first wall <NUM> and the second side wall <NUM>, but both opposite ends of the second connection wall <NUM> in the length direction are not connected to the sides of the airbag <NUM>, and there is a spacing G between the peripheral side wall and each of the opposite ends of the second connection wall <NUM>. For example, as shown in <FIG>, a right end of the second connection wall <NUM> in the length direction is not connected to the side wall <NUM> of the peripheral side wall, and there is a spacing G between the right end and the side wall <NUM>. In other words, only a part of the periphery of the second connection wall <NUM> is connected to the outer wall of the airbag <NUM>. Similarly, the air hole may not be provided on the second connection wall <NUM>.

Alternatively, in another embodiment, as shown in <FIG>, there may be several (for example, three) first connection walls <NUM>, the several first connection walls <NUM> are disposed side by side, and there is a spacing G between neighboring first connection walls <NUM>. Each first connection wall <NUM> is connected between the first wall <NUM> and the first side wall <NUM>, but at least one end in the length direction is not connected to the peripheral side wall of the airbag <NUM>. For example, the right end of a first connection wall <NUM> that is at the left end is not connected to the peripheral side wall of the airbag <NUM>, the left end of a first connection wall <NUM> that is at the right end is not connected to the peripheral side wall of the airbag <NUM>, and neither the left end nor the right end of a first connection wall <NUM> at the middle is connected to the peripheral side wall of the airbag <NUM>. Certainly, <FIG> is merely an example. For example, neither of opposite ends of each first connection wall <NUM> may be connected to the peripheral side wall of the airbag <NUM>. Because the first connection walls <NUM> do not partition the air chamber in this case, air holes may not be provided on the first connection walls <NUM>.

In another embodiment, as shown in <FIG>, there may also be several (for example, three) second connection walls <NUM>, the several second connection walls <NUM> are disposed side by side, and there is a spacing G between neighboring second connection walls <NUM>. Each second connection wall <NUM> is connected between the first wall <NUM> and the second side wall <NUM>, but at least one end in the length direction is not connected to the peripheral side wall of the airbag <NUM>. For example, the right end of a second connection wall <NUM> that is at the left end is not connected to the peripheral side wall of the airbag <NUM>, the left end of a second connection wall <NUM> that is at the right end is not connected to the peripheral side wall of the airbag <NUM>, and neither the left end nor the right end of a second connection wall <NUM> at the middle is connected to the peripheral side wall of the airbag <NUM>. Certainly, <FIG> is merely an example. For example, neither of opposite ends of each second connection wall <NUM> may be connected to the peripheral side wall of the airbag <NUM>. Because the second connection walls <NUM> do not partition the air chamber in this case, air holes may not be provided on the first connection walls <NUM>.

The airbag <NUM> in <FIG> is not inflated, and the foregoing outer walls, the first connection wall <NUM>, and the second connection wall <NUM> of the airbag <NUM> are all in a deflated state. As shown in <FIG>, during inflation of the airbag <NUM>, the foregoing outer walls, the first connection wall <NUM>, and the second connection wall <NUM> are 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 wall <NUM> is pulled by the first connection wall <NUM>, and a connection position of the first connection wall <NUM> on the first side wall <NUM> is in the middle of the first side wall <NUM>, the first side wall <NUM> generally does not protrude outward. Similarly, because the second side wall <NUM> is pulled by the second connection wall <NUM>, and a connection position of the second connection wall <NUM> on the second side wall <NUM> is in the middle of the second side wall <NUM>, the second side wall <NUM> generally does not protrude outward. The first wall <NUM> is pulled by both the first connection wall <NUM> and the second connection wall <NUM>, and a connection position of the first connection wall <NUM> on the first wall <NUM> and a connection position of the second connection wall <NUM> on the first wall <NUM> are in the middle of the first wall <NUM>. Therefore, the first wall <NUM> generally does not protrude outward. Because the second wall <NUM> is not pulled, the second wall <NUM> may slightly protrude outward.

<FIG> is a schematic diagram of a principle of compressing a blood vessel <NUM> in human tissue <NUM> when a conventional airbag <NUM> expands. Because the conventional airbag <NUM> has only an outer wall, when in an expanded state, the conventional airbag <NUM> forms 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 X1 of the blood vessel <NUM> (a length of a closed part of the blood vessel <NUM> under compression) to be much less than a width X0 of the conventional airbag <NUM>. Consequently, pressure exerted by the conventional airbag <NUM> on the blood vessel <NUM> is limited, and the blood vessel <NUM> cannot be completely compressed and closed. Therefore, blood pressure measurement accuracy is reduced.

In addition, as shown in <FIG>, after the conventional airbag <NUM> is deflated, two opposite ends of the conventional airbag <NUM> in the width direction loosen and extend. As a result, the conventional airbag <NUM> squeezes 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 in <FIG>, because the airbag <NUM> in Embodiment <NUM> has the first connection wall <NUM> and the second connection wall <NUM>, an outline of an expanded airbag <NUM> can be optimized, and air in the airbag <NUM> is limited to flow to the first wall <NUM>, the first side wall <NUM>, and the second side wall <NUM>, so that the air can be pressed more toward the second wall <NUM>, and pressure is concentrated more on the blood vessel <NUM>. It can be learned by comparing <FIG> with <FIG> that an effective compression length X2 of the blood vessel <NUM> in <FIG> is greater than the effective compression length X1 in <FIG>. Because the pressure exerted by the airbag <NUM> on the blood vessel <NUM> is increased, a degree of compression-caused closure of the blood vessel <NUM> can be improved. In this case, the blood pressure measurement accuracy can be improved. In addition, as shown in <FIG>, after the airbag <NUM> in Embodiment <NUM> is deflated, the first side wall <NUM> at one end in the width direction of the airbag <NUM> is pulled inward by the first connection wall <NUM>, and the second side wall <NUM> at the other end in the width direction of the airbag <NUM> is pulled inward by the second connection wall <NUM>, so that the first side wall <NUM> and the second side wall <NUM> do not extend. Therefore, the airbag <NUM> does not squeeze the cuff, the wristband, or the watchband, and product aesthetics and user experience are not affected.

In another embodiment, the first connection wall <NUM> may be connected to the first side wall <NUM> and the second wall <NUM>, and/or the second connection wall <NUM> is connected to the second side wall <NUM> and the second wall <NUM>. Alternatively, either the first connection wall <NUM> or the second connection wall <NUM> may exist, and the first connection wall <NUM> or the second connection wall <NUM> may be connected to any two outer walls of the airbag.

As shown in <FIG>, in Embodiment <NUM>, a difference from the foregoing Embodiment <NUM> is that one end of the second connection wall <NUM> is connected to the second side wall <NUM>, and the other end is connected to the second wall <NUM>. Because the second wall <NUM> is also pulled by the second connection wall <NUM>, outward protrusion of the second wall <NUM> during inflation of the airbag <NUM> can be suppressed, and the second wall <NUM> becomes flatter. In this case, an effective compression length X3 of the blood vessel <NUM> is increased (the effective compression length X3 may be greater than the foregoing effective compression length X2), and a compression area of the airbag <NUM> is increased. Therefore, the pressure exerted by the airbag <NUM> on the blood vessel <NUM> is further increased, the degree of compression-caused closure of the blood vessel <NUM> can be improved. In this case, the blood pressure measurement accuracy can be improved.

As shown in <FIG>, in Embodiment <NUM>, a difference from the foregoing Embodiment <NUM> is that the first connection wall <NUM> is connected between the first wall <NUM> and the first side wall <NUM>, and the second connection wall <NUM> is connected between the first side wall <NUM> and the second wall <NUM>. One end of the first connection wall <NUM> and one end of the second connection wall <NUM> may intersect on the first side wall <NUM>, or may be separated from each other. Because the first wall <NUM>, the first side wall <NUM>, and the second wall <NUM> are all pulled and in limited positions, outward protrusion of the first wall <NUM>, the first side wall <NUM>, and the second wall <NUM> is suppressed when the airbag <NUM> expands. The second side wall <NUM> is not connected to the first connection wall <NUM> and the second connection wall <NUM>, and the second side wall <NUM> may slightly protrude outward. However, according to the foregoing principle, generally, air is still pressed more toward the second wall <NUM> in the airbag <NUM>, 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 wall <NUM> does not loosen and extend during deflation of the airbag <NUM>. Therefore, the first side wall <NUM> does not squeeze the cuff, the wristband, or the watchband, and product aesthetics is not affected.

As shown in <FIG> and <FIG>, in Embodiment <NUM>, based on the solution of Embodiment <NUM>, the airbag <NUM> may further include a third connection wall <NUM>. The third connection wall <NUM> is connected between the first side wall <NUM> and the second wall <NUM>. One end of the third connection wall <NUM> and one end of the first connection wall <NUM> may intersect on the first side wall <NUM>, or may be separated from each other. Because the first wall <NUM>, the second side wall <NUM>, the second wall <NUM>, and the first side wall <NUM> are all pulled and in limited positions, the outline of the expanded airbag <NUM> is further optimized, so that air can be pressed more toward the second wall <NUM>, 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 airbag <NUM>, the first side wall <NUM> and the second side wall <NUM> do not extend. Therefore, the airbag <NUM> does not squeeze the cuff, the wristband, or the watchband, and product aesthetics and user experience are ensured.

As shown in <FIG> and <FIG>, in Embodiment <NUM>, based on the solution of Embodiment <NUM>, the airbag <NUM> may further include a fourth connection wall <NUM>. The fourth connection wall <NUM> is connected between the second side wall <NUM> and the second wall <NUM>. One end of the fourth connection wall <NUM> and one end of the second connection wall <NUM> may intersect on the second side wall <NUM>, or may be separated from each other. The other end of the fourth connection wall <NUM> and one end of the third connection wall <NUM> may be separated on the second wall <NUM>, or may intersect.

As shown in <FIG> and <FIG>, when the airbag <NUM> is inflated and expands, because the first wall <NUM>, the second side wall <NUM>, the second wall <NUM>, and the first side wall <NUM> are all pulled and in limited positions, the outline of the expanded airbag <NUM> is highly optimized, so that air can be pressed more toward the second wall <NUM>, 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 airbag <NUM>, the first side wall <NUM> and the second side wall <NUM> do not extend. Therefore, the airbag <NUM> does not squeeze the cuff, the wristband, or the watchband, and product aesthetics and user experience are ensured.

As shown in <FIG>, in Embodiment <NUM>, a difference from the foregoing embodiments is that the first connection wall <NUM> of the airbag <NUM> connects the first wall <NUM>, the first side wall <NUM>, and the second wall <NUM>, and the second connection wall <NUM> of the airbag <NUM> connects the first wall <NUM>, the second side wall <NUM>, and the second wall <NUM>. Details are as follows.

As shown in <FIG>, the first connection wall <NUM> may have several pleats (similar to a leaf of a folding fan). The first connection wall <NUM> may have a first end 392a, a middle part 392b, and a second end 392c, and the middle part 392b is connected between the first end 392a and the second end 392c. The first end 392a is connected to the first wall <NUM>, the middle part 392b is connected to the first side wall <NUM>, and the second end 392c is connected to the second wall <NUM>. The second connection wall <NUM> may also have several pleats. The second connection wall <NUM> may have a first end 391a, a middle part 391b, and a second end 391c, and the middle part 391b is connected between the first end 391a and the second end 391c. The first end 391a is connected to the first wall <NUM>, the middle part 391b is connected to the second side wall <NUM>, and the second end 391c is connected to the second wall <NUM>. In other embodiments, at least one of the first connection wall <NUM> and the second wall <NUM> may connect only the first wall <NUM> and the second wall <NUM>.

As shown in <FIG>, the first connection wall <NUM> and the second connection wall <NUM> are disposed in the air chamber of the airbag <NUM>, 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 S4 and the chamber S8, air holes may be provided in an area of the first connection wall <NUM> between the first end 392a and the middle part 392b, an area of the first connection wall <NUM> between the middle part 392b and the second end 392c, an area of the second connection wall <NUM> between the first end 391a and the middle part 391b, and an area of the second connection wall <NUM> between the middle part 391b and the second end 391c.

As described above, in another embodiment, there may be one first connection wall <NUM>, or there may be several first connection walls <NUM> arranged side by side at intervals. At least one end of a single first connection wall <NUM> in the length direction may be spaced away from the peripheral side wall of the airbag <NUM>. In other words, at least a part of a periphery of the first connection wall <NUM> is not connected to the outer wall of the airbag <NUM>. Because the first connection wall <NUM> does not partition the air chamber in this case, the air holes may not be provided on the first connection wall <NUM>. The second connection wall <NUM> may have a design similar to that of the first connection wall <NUM>, and similarly, air holes may not be disposed on the second connection wall <NUM>.

As shown in <FIG>, when the airbag <NUM> is inflated and expands, pleats on the first connection wall <NUM> and the second connection wall <NUM> stretch, so that the first connection wall <NUM> and the second connection wall <NUM> are tensed. A pleat structure can provide a sufficient deformation margin, and switching of the first connection wall <NUM> between a loosened state and a tensed state can be implemented. In other embodiments, the pleats are not mandatory. For example, when the airbag <NUM> is deflated, the first connection wall <NUM> and the second connection wall <NUM> may naturally curl up.

Claim 1:
An airbag (<NUM>) of an electronic blood pressure monitor, wherein
the airbag (<NUM>) comprises an outer wall and at least one connection wall (<NUM>, <NUM>, <NUM>, <NUM>); the outer wall comprises a first wall (<NUM>), a peripheral side wall, and a second wall (<NUM>); the first wall (<NUM>) and the second wall (<NUM>) are disposed opposite to each other; the peripheral side wall is connected to a periphery of the first wall (<NUM>) and a periphery of the second wall (<NUM>); the first wall (<NUM>), the peripheral side wall, and the second wall (<NUM>) form an air chamber (S);
characterized in that the at least one connection wall (<NUM>, <NUM>, <NUM>, <NUM>) is located in the air chamber (S); each connection wall (<NUM>, <NUM>, <NUM>, <NUM>) is connected to the peripheral side wall and the first wall (<NUM>) or to the peripheral side wall and the second wall (<NUM>); and each connection wall (<NUM>, <NUM>, <NUM>, <NUM>) is configured to be tensed when the airbag (<NUM>) is in an expanded state.