JP2010213959A - Sphygmomanometer - Google Patents

Abstract

A sphygmomanometer with a simple and inexpensive configuration that consumes less energy and can quickly press the upper arm.
A blood pressure monitor is rolled up into a spiral shape inside a housing having a cylindrical insertion portion, a first air bag provided inside the insertion portion, and the first air bag. A support band 34 that can be expanded by elastic flexibility, a second air bag 36 that is provided inside the support band 34 and presses the upper arm of the measurement subject inserted therein, and a first air Pressurizing means 18 for supplying air to the bag 32 and the second air bag 36. When the first air bag 32 and the second air bag 36 are in a non-pressurized state at the beginning of blood pressure measurement, the support band 34 is expanded in diameter by inserting the upper arm through the second air bag 36. Is done.
[Selection] Figure 3

Description

  The present invention relates to a blood pressure having a cylindrical housing, an air bag that is provided in the housing and presses the upper arm of a person to be measured, and a pressurizing means for supplying air to the air bag. Regarding the total.

  Home blood pressure monitors are becoming popular so that blood pressure can be measured on a daily basis for health management. It is desirable that a home sphygmomanometer not only accurately measures blood pressure but also has a simple operation method, is inexpensive, and is compact.

  An arm-in sphygmomanometer (for example, Patent Document 1) is suitable for home use because blood pressure can be automatically measured simply by inserting the upper arm and operating a predetermined button.

  There are mainly Korotkoff method and oscillometric method for blood pressure measurement methods in sphygmomanometers. In the Korotkoff method, a sensor for detecting Korotkoff sound (hereinafter also referred to as K sound) is provided in the air bag, and blood pressure values (maximum blood pressure and minimum blood pressure) are obtained based on the pressure state of the air bag and the generation and disappearance of the K sound. . The Korotkoff method is characterized by the fact that the blood pressure value can be obtained with high accuracy and the K sound is detected by bringing the sensor into close contact with the upper arm, so there is no influence of the capacity of the air bag. Affected by.

  In the oscillometric method, the blood pressure value is obtained based on the pressure state of the air bag and the fluctuation state of the arterial wave of the air bag. The oscillometric method is characterized by the fact that the sensor can be placed anywhere as long as it communicates with the air bag and is less affected by ambient noise and vibrations. Fluctuation is less likely to occur and the measurement error increases. That is, the Korotkoff method and the oscillometric method each have advantages and disadvantages.

Japanese Patent No. 3826938

  For arm-in sphygmomanometers (ie, methods that do not require air bags to be wrapped around the upper arm to measure blood pressure), the cylindrical housing is set to a reasonably large diameter so that it can be measured even with a thick upper arm Has been. On the other hand, the internal air bag is configured to be sufficiently inflatable toward the inner diameter side so that measurement can be performed even for a thin upper arm.

  However, in order to enable sufficient expansion in this way, it is necessary to increase the capacity of the air bag, and the oscillometric method decreases the measurement accuracy. For this reason, a sphygmomanometer equipped with a winding mechanism that winds a spiral air bag to reduce the capacity of the air bag has been put into practical use. Soaring is inevitable.

  In the sphygmomanometer described in Patent Document 1, the air bag is made into two layers, a cylindrical flexible member that can be expanded and contracted is provided therebetween, and the flexible bag is compressed by inflating the fluid bag for compressing the outer flexible member. The diameter of the sex member is reduced, and then the living body is compressed by the inner layer air bag for compressing the living body. According to such a sphygmomanometer, a winding mechanism for winding the air bag is unnecessary, and a simple and inexpensive sphygmomanometer can be obtained.

  However, in the sphygmomanometer described in Patent Document 1, the flexible member provided between the two layers of air bags is reduced in diameter by the outer layer flexible member compression fluid bag, Is set to a large diameter so that the thick upper arm does not touch it. Therefore, the fluid bag for compressing the flexible member needs to have a pressure enough to reduce the diameter of the flexible member. Moreover, since the pressure increases proportionally as the diameter is reduced, in the case of a thin upper arm, it is difficult to detect an increase in pressure when the flexible member contacts the upper arm.

  Further, the fluid bag for compressing the flexible member consumes a large amount of energy as much as the diameter of the flexible member is reduced, and it takes time to pressurize.

  Furthermore, as shown in FIG. 10, when the diameter of the flexible member 900 is reduced by the flexible member compression fluid bag 902, the end portion 904 tends to protrude toward the outer diameter side, and a gap 905 is generated. There is a concern of interfering with the flexible member compression fluid bag 902.

  The present invention has been made in consideration of such problems, and an object of the present invention is to provide a sphygmomanometer that can reduce the amount of energy consumed and can quickly press the upper arm with a simple and inexpensive configuration. .

  A sphygmomanometer according to the present invention includes a housing having a cylindrical insertion portion into which an upper arm of a measurement subject is inserted, a first air bag provided inside the insertion portion, and an inner side of the first air bag. A support band which is rolled up into a vortex shape and can be expanded in diameter by elastic flexibility; and a second air bag which is provided inside the support band and presses the upper arm of the measurement subject inserted therein And a pressurizing means for supplying air to the first air bag and the second air bag, and the first air bag and the second air bag are not pressurized at the initial stage of blood pressure measurement start. When in a state, the support band is expanded in diameter by inserting an upper arm through the second air bag.

  As described above, since the support band is elastically expanded by inserting the upper arm therein, the support band is lightly pressing the upper arm alone in this state, and the pressure in the first air bag is increased. Pressure can be applied quickly and energy consumption is small.

  The inner diameter of the support band at the initial stage may be 50 mm to 80 mm.

  The pressurizing means is provided in a pressure pump, a switching valve for switching a flow path from the pressure pump to the first air bag or the second air bag, and a flow path communicating with the first air bag. You may have a 1st exhaust valve and the 2nd exhaust valve provided in the flow path connected to the said 2nd air bag. By providing such a switching valve, the pressure pump can be shared by the first air bag and the second air bag. Further, by providing the first exhaust valve and the second exhaust valve, the first air bag and the second air bag can be individually decompressed, and the decompression appropriate for the oscillometric method can be performed.

  You may have a pressure sensor which detects the pressure of the communicating path which connects the said pressurization pump and the said switching valve. With such an arrangement, the pressure of the first air bag and the pressure of the second air bag can be switched and measured with one pressure sensor.

  The blood pressure may be obtained by an oscillometric method based on the pressure value of the second air bag.

  According to the sphygmomanometer according to the present invention, since the support band is elastically expanded by inserting the upper arm therein, the support band is lightly pressing the upper arm alone in that state, The pressurization in the 1st air bag can be performed rapidly and energy consumption is also small. Since the second air bag is sandwiched between the support bands, the subsequent expansion amount can be small, and the capacity can be reduced to easily detect the pressure sensor signal.

It is a perspective view of the sphygmomanometer according to the present embodiment. It is a front view of the sphygmomanometer according to the present embodiment. It is a disassembled perspective view of the arm band in this Embodiment. It is a disassembled perspective view of the 1st air bag of the state which expand | deployed. It is a cross-sectional front view of the armband with the upper arm inserted. It is a block block diagram of the main body in this Embodiment. It is a flowchart (the 1) which shows the procedure of blood pressure measurement. It is a flowchart (the 2) which shows the procedure of blood pressure measurement. It is a graph which shows the internal pressure change of a 1st air bag. It is a schematic diagram which shows a mode that a flexible member is diameter-reduced by the outer layer side air bag in the blood pressure meter which concerns on a prior art.

  Hereinafter, embodiments of the sphygmomanometer according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1 and FIG. 2, the sphygmomanometer 10 according to the present embodiment is a so-called arm-in type, and an arm band (also referred to as a cuff or a manchette) 12 into which the upper arm of the measurement subject is inserted. And a main body 16 for supporting the armband 12. The sphygmomanometer 10 is a desktop type and is driven by a commercial AC power supply or a battery (including a secondary battery). 1 and 2, the cloth cover 38 is omitted so that the armband 12 can be visually recognized.

  The main body 16 includes a housing 30 having a cylindrical insertion portion into which the upper arm of the person to be measured is inserted, a pressurizing means 18 for supplying and exhausting air to and from the arm band 12, and measuring the blood pressure of the person to be measured. A control unit 20, a display unit 22 for displaying the blood pressure obtained by the control unit 20, and an operation button 24.

  The housing 30 has, for example, a weight of about 350 g, an outer diameter of about 140 mm, and an inner diameter of about 135 mm. The housing 30 may be separate from the main body 16 (the pressurizing unit 18, the control unit 20, the display unit 22, and the operation button 24).

  As shown in FIG. 3, the armband 12 is disposed inside the insertion portion of the housing 30. The arm band 12 is provided inside the first air bag 32 and a first air bag 32 (also referred to as an air bag or a bladder) provided inside the insertion portion of the housing 30. A support band 34 that is rolled up into a vortex shape and expandable by elastic flexibility, and a second air bag that is provided inside the support band 34 and presses the upper arm of the measurement subject inserted therein. 36 and a flexible cloth cover 38 that covers these members so as not to be exposed. The cloth cover 38 is formed of a stretch material that can expand and contract in the axial direction and the circumferential direction. The cloth cover 38 includes a cylindrical cover main body and two ring-shaped frames provided at both ends of the cover main body.

  As shown in FIG. 1 and FIG. 2, the arm band 12 has a first air bag 32, a support band 34, and a second air bag 36 arranged in the housing 30, and further a cloth cover 38 in the housing 30. It is assembled by inserting and fitting the frame of the cloth cover 38 to both ends (insertion opening and insertion opening of the insertion portion) of the housing 30.

  The support band 34 is, for example, a thin resin plate, and can be expanded in diameter by elastic flexibility in the bending direction as a plate material, but is a hard material that does not easily stretch or strain other than flexibility. Accordingly, the support band 34 exhibits a pressure isolation action in which pressure fluctuations are not transmitted between the first air bladder 32 and the second air bladder 36 and the pressure fluctuations are not attenuated.

  The support band 34 has a curled shape when there is no external force, and the second air bag 32 and the second air bag 36 are in a non-pressurized state at the initial stage of blood pressure measurement. The diameter is expanded by inserting the upper arm into the air bag 36. When the upper arm of the measurement subject is thin, the diameter is slightly increased, and when the upper arm is thick, the diameter is increased greatly.

  The support band 34 is set to have an inner diameter D of 50 mm to 80 mm so that the support band 34 can be appropriately wound even in the case of a thick upper arm as well as a thin upper arm. Since the inner diameter is set to 80 mm or less, the diameter can be increased appropriately even when a thin upper arm is inserted, and the upper arm can be contacted. Easy to insert.

  The first air bag 32 and the second air bag 36 are connected to the pressurizing means 18 by the first tube 14a and the second tube 14b, and are supplied and exhausted, and the upper arm of the subject to be measured inserted therein. It is annular so that it is pressed over the entire circumference.

  In the following description of the armband 12 and its components, the vertical direction in which the upper arm is inserted is the X direction, and the direction along the circumference of the housing 30 is the Y direction. When the person to be measured inserts the upper arm in the armband 12, the side close to the elbow is set to the X1 side, and the side close to the shoulder is set to the X2 side. In order to make it easier to understand the insertion direction of the upper arm of the armband 12, for example, the X1 direction side may be slightly narrowed.

  As shown in FIG. 4, the first air bladder 32 includes a resin sheet 40, four X bell poles 44a, one Y bell pole 44b, and a nozzle 50 connected to the first tube 14a. The resin sheet 40 is a transparent urethane sheet having a width of about 120 mm and a length of about 420 mm, for example. The X bell pole 44a and the Y bell pole 44b are, for example, foamed polyethylene thin plates. The weight of the X bell pole 44a is about 2 g, for example, and the weight of the Y bell pole 44b is about 10 g, for example.

  The resin sheet 40 is folded in half along the Y-direction bend line 48 at the central portion, and the periphery is welded into a bag shape to form a base body of the first air bag 32. In the resin sheet 40, the inner peripheral portion (X1 side from the bent line 48 in FIG. 4) is the inner peripheral surface 40a, and the outer peripheral portion (X2 side from the bent line 48 in FIG. 4) is the outer peripheral surface. 40b. At the end of the inner peripheral surface 40a, a folding allowance 40c that is folded back with respect to the outer peripheral surface 40b is provided.

  Although detailed description of the second air bag 36 is omitted, the bell poles 44a and 44b in the first air bag 32 may be omitted. As will be described later, the second air bag 36 may have a smaller capacity than the first air bag 32.

  As shown in FIG. 5, in the armband 12, the outer peripheral surface 40b of the first air bag 32 is fixed to the inner peripheral surface of the housing 30 (as described above, the inner diameter is about 135 mm), and does not spread further outward. The inner peripheral surface 40 a of the first air bag 32 is moved inward by being pressurized from the pressurizing pump 78, and the diameter of the first air bag 32 is reduced. By supplying air, the first air bladder 32 can be appropriately pressurized and expanded toward the inner diameter side to hold the support band 34.

  Unlike the method in which the armband 12 of the sphygmomanometer 10 is wound around the upper arm with a hook-and-loop fastener, it is not necessary to wrap the measurement band around the upper arm, and only the upper arm is inserted into the armband 12. On the other hand, since the thickness of the upper arm varies considerably depending on the person to be measured, the amount of expansion of the first air bag 32 for supporting the support band 34 is sufficiently secured.

  As shown in FIG. 6, the control unit 20 is a part that integrally controls the entire sphygmomanometer 10, and is configured based on a CPU 60, and includes an A / D converter 66, a pump driver 68, and the like. The first exhaust valve driver 70, the second exhaust valve driver 72, the switching valve driver 74, and the storage unit 76.

  The pressurizing means 18 includes a pressurizing pump 78, a first exhaust valve 80, a second exhaust valve 82, a flow path switching valve 84, a pressure sensor 86, and the like. The A / D converter 66 converts the analog signal of the pressure sensor 86 into a digital value and supplies it to the CPU 60. The pump driver 68, the first exhaust valve driver 70, the second exhaust valve driver 72, and the switching valve driver 74 are a pressurizing pump 78, a first exhaust valve 80, a second exhaust valve 82, and a flow path switching valve under the action of the CPU 60. 84 is controlled. The second exhaust valve 82 can control the degree of opening so that the internal pressure P2 of the second air bladder 36 can be gradually reduced. The first exhaust valve 80 may be the same as the second exhaust valve 82, but may be an on / off valve.

  The flow path switching valve 84 switches the air supplied from the pressurizing pump 78 to the first tube 14a or the second tube 14b and supplies the air, and pressurizes the first air bag 32 and the second air bag 36 individually. Can do. The first exhaust valve 80 is connected to a conduit communicating with the first tube 14a, and the second exhaust valve 82 is connected to a conduit communicating with the second tube 14b. The first air bag 32 and the second air bag 36 can be individually evacuated.

  Since the pressurization pump 78 and the pressure sensor 86 are provided in a pipe line upstream of the flow path switching valve 84 and are shared by the first air bag 32 and the second air bag 36, a simple configuration that does not increase the number of parts. It is.

  The storage unit 76 is a part that stores programs of the CPU 60, variables, blood pressure measurement values, and the like, and includes a ROM, a RAM, a flash memory, and the like.

  As a software processing unit, the CPU 60 includes a calculation unit 87 for obtaining blood pressure by an oscillometric method based on a pulse wave component obtained through the pressure sensor 86, a sequence unit 88 for defining an operation procedure of blood pressure measurement, and a calculation unit 87. And a result determination unit 90 for evaluating the obtained blood pressure value.

  The result determination unit 90 determines whether the blood pressure value obtained by the calculation unit 87 is appropriate, and if it is normal, displays the value on the display unit 22. Here, the term “normal” means that the signal state is appropriate, not as a health barometer. The result determination unit 90 displays a predetermined error when the blood pressure value obtained by the calculation unit 87 is not normal.

  The result determination unit 90 may determine whether the blood pressure value is appropriate, for example, whether the pulse is weak and the pulse wave cannot be recognized and the blood pressure cannot be determined.

  The sequence unit 88 controls the operation of each unit based on the operation of the operation button 24. In general, when the start of blood pressure measurement is performed by the operation button 24, the first air bag 32 and the second air bag 32 are monitored while controlling the pressurizing pump 78 and the flow path switching valve 84 and monitoring the signal of the pressure sensor 86. The air bag 36 is pressurized. Thereafter, the second exhaust valve 82 is controlled to depressurize the second air bladder 36, and the first exhaust valve 80 is opened to depressurize the first air bladder 32.

  The sequence unit 88 monitors the operation of the operation button 24, and performs a predetermined process corresponding to a predetermined interruption operation during blood pressure measurement. Moreover, display control of a pulse value, a past measurement value, etc. is performed based on a predetermined operation. The sequence unit 88 controls the procedure shown in FIG.

  Next, the operation of the sphygmomanometer 10 configured as described above will be described. In the sphygmomanometer 10, in the initial state, the first exhaust valve 80 and the second exhaust valve 82 are opened, and the first air bag 32 and the second air bag 36 are in a non-pressurized state.

  First, the person to be measured inserts the upper arm A into the arm band 12 as shown in FIG. Since the inner diameter D of the support band 34 at the initial time is 50 mm to 80 mm (see the phantom line in FIG. 5), the support band 34 is inserted into the second air bag 36 by inserting the upper arm into the arm band 12. The diameter is expanded via In this state, the support band 34 is moderately soft so as not to be blocked.

  The second air bag 36 is sandwiched between the support band 34 and the upper arm, is elastically biased, and has a volume of substantially zero. Even if some air remains in the second air bag 36, it is discharged from the second exhaust valve 82.

  As is clear from FIG. 5, since the support band 34 is expanded in diameter, the curvature is reduced over the entire circumference, the end 34a is pressed against the inner diameter side, there is no gap, and there is no first air bag. There is no concern of interfering with 32. Next, when the measurement subject operates the operation button 24, measurement of blood pressure is started under the action of the control unit 20.

  In step S1 of FIG. 7, the first exhaust valve 80 and the second exhaust valve 82 are closed.

  In step S2, the air supply destination of the flow path switching valve 84 is set to the first tube 14a side.

  In step S <b> 3, the pressurizing pump 78 is driven to supply air to the first air bag 32.

  In step S4, the control unit 20 monitors the internal pressure P1 applied to the first air bladder 32 and the first tube 14a based on a signal from the pressure sensor 86. At this time, since the support band 34 is elastically wound around the upper arm and no external force acts on the first air bag 32, the energy required for supplying air to the first air bag 32 is small, As shown in FIG. 9, the internal pressure P1 is substantially zero for a while.

  In step S5, the end of pressurization to the first air bag 32 is determined while monitoring the internal pressure P1. That is, when the first air bag 32 is inflated and there is no gap between it and the support band 34, the internal pressure P1 rises rapidly. By detecting this, the pressurization of the first air bag 32 is terminated and the step is performed. Move to S6. If the pressurization is continued, the process returns to step S4. As is clear from FIG. 9, the internal pressure P1 shows a rapid and large increase, so that it is easy to make the determination in step S5.

  In step S6, the air supply destination of the flow path switching valve 84 is switched to the second tube 14b side, and the air supply to the second air bag 36 is started. Thereby, the supply of air to the first air bag 32 is completed, and the support band 34 is stably held.

  In step S7, the internal pressure P2 applied to the second air bladder 36 and the second tube 14b is monitored by the signal from the pressure sensor 86. The pressure sensor 86 automatically detects the pressure on the second tube 14b side by switching the flow path switching valve 84, and the detection signal switching process is substantially unnecessary.

  In step S8, the end of pressurization to the second air bag 36 is determined while monitoring the internal pressure P2. That is, when there is almost no gap between the second air bag 36 and the support band 34, the internal pressure P2 immediately increases. Therefore, it is confirmed that the internal pressure P2 has increased to a predetermined ischemic pressure, and the process proceeds to step S9. When the pressurization to the second air bag 36 is continued, the process returns to step S7.

  Thus, since the second air bag 36 is inflated from the state of being lightly crushed by the support band 34, the amount of expansion is sufficiently small, and the second air bag 36 may have a small capacity.

  In step S9, pressurization by the pressurization pump 78 is terminated. The flow path switching valve 84 is maintained on the second tube 14b side. Accordingly, the internal pressure P2 of the second air bladder 36 can be continuously detected by the pressure sensor 86.

  In step S10, the second exhaust valve 82 is appropriately opened, and the pressure of the second air bag 36 is reduced to about 2 to 5 mmHg / sec. In order to obtain a stable measurement state, the second air bladder 36 is depressurized at a substantially constant speed.

  In step S <b> 11 of FIG. 8, the calculation unit 87 detects the magnitude of the pulse wave obtained from the pressure sensor 86. At this time, when the second air bladder 36 has a sufficiently small capacity and the internal pressure P2 does not propagate to the first air bladder 32 due to the isolation action of the support band 34, and the artery opens and a pulse wave is generated, The pulse wave is easily transmitted to the pressure sensor 86.

  In step S12, the calculation unit 87 temporarily determines the systolic blood pressure value based on the sudden increase in the pulse wave amplitude. If no pulse wave is generated or is sufficiently small, the process returns to step S11.

  The pulse wave amplitude further increases and reaches its peak. This pressure is the mean blood pressure. Thereafter, the pulse wave amplitude decreases, and at a certain pressure, the pulse wave amplitude rapidly decreases.

  In step S <b> 13, the calculation unit 87 temporarily determines the minimum blood pressure value based on the sudden decrease in the pulse wave. When the pulse wave has not decreased, the process returns to step S11.

  In step S14, the first exhaust valve 80 and the second exhaust valve 82 are opened, the first air bag 32 and the second air bag 36 are exhausted, and the internal pressures P1 and P2 are set to 0, respectively. The second air bag 36 is elastically pressed by the support band 34 and can be quickly exhausted.

  In step S15, the result determination unit 90 determines whether the systolic blood pressure value and the minimum blood pressure value temporarily determined in steps S12 and S13 are appropriate as described above.

  In step S16, the obtained maximum blood pressure value and minimum blood pressure value are displayed on the display unit 22 in units of mmHg or Pa. The display unit 22 may display additional information such as a pulse and a pulse pressure. When there is an abnormality, a predetermined error is displayed.

  Thus, according to the sphygmomanometer 10 according to the present embodiment, when the first air bag 32 and the second air bag 36 are in the non-pressurized state at the initial stage of the start of blood pressure measurement, the support band 34 is the second. The diameter is expanded by inserting the upper arm into the air bag 36. Thereby, in that state, the support band 34 is lightly pressing the upper arm alone, so that the first air bladder 32 can be pressurized quickly and the energy consumption is small. Further, since the second air bag 36 is sandwiched by the support band 34, the subsequent expansion amount is small, and the capacity is reduced and the signal of the pressure sensor 86 is easily detected.

  The sphygmomanometer 10 does not require a winding mechanism for winding the air bag, and is simple and inexpensive.

  The sphygmomanometer according to the present invention is not limited to the above-described embodiment, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Blood pressure monitor 12 ... Arm band 14a ... 1st tube 14b ... 2nd tube 16 ... Main body 18 ... Pressurizing means 20 ... Control part 30 ... Housing 32 ... 1st air bag 34 ... Supporting belt 36 ... 2nd air bag 78 ... Pressure pump 80 ... First exhaust valve 82 ... Second exhaust valve 84 ... Flow path switching valve 86 ... Pressure sensor 87 ... Calculation unit 88 ... Sequence unit 90 ... Result determination unit

Claims (5)

A housing having a cylindrical insertion portion into which the upper arm of the measurement subject is inserted;
A first air bag provided inside the insertion portion;
A support band which is provided inside the first air bag by being rolled up in a vortex shape and can be expanded in diameter by elastic flexibility;
A second air bag that is provided inside the support band and compresses the upper arm of the measurement subject inserted therein;
Pressurizing means for supplying air to the first air bag and the second air bag;
Have
When the first air bag and the second air bag are in the non-pressurized state at the beginning of blood pressure measurement, the support band is expanded by inserting the upper arm through the second air bag. A sphygmomanometer characterized by being calibrated. The sphygmomanometer according to claim 1,
An internal diameter of the support band at the initial time is 50 mm to 80 mm. The sphygmomanometer according to claim 1 or 2,
The pressurizing means includes a pressurizing pump,
A switching valve for switching the flow path from the pressurizing pump to the first air bag or the second air bag;
A first exhaust valve provided in a flow path communicating with the first air bag;
A second exhaust valve provided in a flow path communicating with the second air bag;
A sphygmomanometer, comprising: The blood pressure monitor according to claim 3,
A sphygmomanometer, comprising a pressure sensor for detecting a pressure in a communication path connecting the pressurizing pump and the switching valve. The sphygmomanometer according to any one of claims 1 to 4,
A sphygmomanometer, wherein blood pressure is obtained by an oscillometric method based on a pressure value of the second air bag.

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