JP2011072415A - Electronic sphygmomanometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic sphygmomanometer capable of obtaining the accurate pulse wave of a blood vessel even if the blood vessel of the upper arm is pressurized by supplying air into an air bag by driving two pumps. <P>SOLUTION: The electronic sphygmomanometer 1 has the air bag 14 for permitting the insertion of the upper arm of a measuring person to pressurize the blood vessel of the upper arm, first and second pumps 44 and 45 for supplying air into the air bag 14, a first drive part 62A for driving the first pump 44, a second drive part 62B for driving the second pump 45 and a control part 56 for applying commands to the first drive part 62A to control the driving of the first pump 44, applying commands to the second drive part 62B to control the driving of the second pump 45, rotationally driving the first pump 44 by the whole output when the pulse wave of the blood vessel is detected and driving the second pump 45 by output lower than the whole output. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic sphygmomanometer, and more particularly to an electronic sphygmomanometer having two pumps for supplying air to an air bag.

In recent years, pseudohypertension due to white coat hypertension has been a problem in blood pressure measurement for hypertension treatment performed in medical institutions. As a cause of this pseudohypertension, mental instability such as tension and anxiety in front of a doctor in a hospital is considered. On the other hand, attention has been focused on blood pressure values measured alone in a mentally stable home. For this reason, an electronic sphygmomanometer of the type that is used for home blood pressure measurement and is measured by one person is attracting attention.
The problem with this type of sphygmomanometer is how to wear the armband on the arm. When the position of the air bag in the armband is not appropriate for the upper arm or when the wrapping strength is not appropriate for the upper arm, the pressure of the air bag in the armband is not correctly applied to the upper arm, and the blood pressure is high. May be. In recent years, to solve this, simply by inserting the arm into the cylindrical armband, the air bag in the armband is automatically placed at the correct position of the arm, and blood pressure is measured with the correct wrapping strength. An electronic sphygmomanometer (hereinafter referred to as an “arm-in type”) in which a sphygmomanometer body and an armband unit that can be used are integrated has been developed (see Patent Document 1).

However, when the user uses the arm-in type sphygmomanometer, the armband part into which the arm is inserted is integrated with the sphygmomanometer body, so when the position of the sphygmomanometer body is away from the measurer, The measurer is likely to make a measurement in a leaning state. For this reason, the abdomen of the measurer is compressed and the abdominal pressure increases, and as a result, a phenomenon in which the blood pressure increases may be seen. This increase in blood pressure has been pointed out as the occurrence of new pseudohypertension.
Therefore, in order to deal with the inconvenience of the occurrence of such pseudo-hypertension, the armband can be separated from the sphygmomanometer body, and even if the place where the sphygmomanometer body is installed is away from the measurer, the measurer is in the sitting position. An electronic sphygmomanometer of a type (hereinafter referred to as a “thru-in type”) capable of performing measurement without applying abdominal pressure in a state where the back is stretched has been developed. In this through-in type electronic sphygmomanometer, the upper arm is inserted into the air bag in the armband, air is supplied into the air bag using two pumps, and the air supply is stopped and the valve is loosened. However, the maximum blood pressure and the minimum blood pressure are detected by taking the pulse wave of the blood vessel using the microphone.

JP 2005-237427 A

In the above-described slew-in type electronic sphygmomanometer, two pumps are necessary to supply a necessary air capacity in the air bag. Moreover, two pumps are required to supply air into the air bag in 50 seconds or less to measure blood pressure.
However, even if the two pumps are driven at the same rotational speed, a slight difference in rotational speed may occur between the two pumps due to variations in manufacturing the two pumps. Thus, a slight pump speed pulsation occurs between the two pumps due to a slight difference in the rotational speed. Therefore, when the two pumps are driven to supply air into the air bag and pressurize the upper arm blood vessel, a pump pulsation occurs between the two pumps, and this pump pulsation becomes a blood vessel pulse wave. As a result, the pulse wave of the necessary blood vessel cannot be obtained and accurate blood pressure measurement may not be possible.
Therefore, in order to solve the above-described problem, the present invention is such that even if two pumps are driven to supply air into the air bag and pressurize the upper arm blood vessel, the pulsation of the pump is superimposed on the pulse wave of the blood vessel. An object is to provide an electronic sphygmomanometer that can obtain an accurate blood vessel pulse wave.

  An electronic sphygmomanometer according to the present invention drives an air bag for inserting a measurer's upper arm to pressurize a blood vessel, a first pump and a second pump for supplying air into the air bag, and the first pump. A first driving unit that controls the driving of the first pump by giving a command to the first driving unit and a command to the second driving unit. When controlling the driving of the second pump and detecting the pulse wave of the blood vessel, the first pump is driven to rotate at full output, and the second pump is driven at a lower output than the full output of the first pump. An electronic sphygmomanometer, comprising: a control unit to be driven. With the above configuration, even if two pumps are driven to supply air into the air bag to pressurize the upper arm blood vessel, the pulsation of the pump is not superimposed on the pulse wave of the blood vessel, and the accurate blood vessel pulse wave Can be obtained.

In the electronic sphygmomanometer according to the present invention, the control unit drives the second pump at 60% to 80% of the total output when detecting the pulse wave of the blood vessel. With the above configuration, even if the two pumps are driven to supply air into the air bag and pressurize the upper arm blood vessel, the pulsation of the pump does not overlap the pulse wave of the blood vessel. If the output of the second pump 45 is less than 60%, the pump will rotate at a low speed, not only will the battery be exhausted, but also the air bag will not be able to send enough air to the air bag. This is not preferable because it may not be possible to apply the necessary pressure to the surface to be measured. Further, if the output of the second pump exceeds 80%, it is not preferable because a beat may occur between the first pump and the second pump.
In the electronic sphygmomanometer according to the present invention, the control unit drives the second pump at 70% of the total output when detecting the pulse wave of the blood vessel. With the above configuration, even if the two pumps are driven to supply air into the air bag and pressurize the upper arm blood vessel, the pulsation of the pump does not overlap the pulse wave of the blood vessel.

In the electronic sphygmomanometer according to the present invention, before the control unit detects the pulse wave of the blood vessel and starts to pressurize air into the air bag until the pressure reaches 40 mmHg, The first pump is driven at full output, and the second pump is also driven at full output. With the above configuration, by driving both the first pump and the second pump with full output, the rise time when starting to pressurize the air bladder can be shortened.
In the electronic sphygmomanometer according to the present invention, when the pressure of the air in the air bag approaches the stop target pressure, the control unit gives a command to the first driving unit to stop driving the first pump, A command is given to the second drive unit to drive the second pump at 70% of the total output. With the above configuration, when the first pump and the second pump are stopped at a stretch, the pressure difference between the vicinity of the pressure sensor and the internal pressure of the air bag avoids a significant drop in the internal pressure of the air bag, and the pressure of the air bag suddenly increases. The target stop pressure can be smoothly reached without causing a decrease.

In the electronic sphygmomanometer according to the present invention, after the air pressure in the air bag reaches the stop target pressure, the Korotkoff sound (K sound) is detected to detect the maximum blood pressure, and the Korotkoff sound (K sound) is detected. It has a microphone for detecting the minimum blood pressure by disappearance. With the above configuration, the systolic blood pressure and the diastolic blood pressure can be reliably detected using the detection and disappearance of the Korotkoff sound (K sound) using the microphone.
The electronic sphygmomanometer according to the present invention includes an armband portion having a hard cylindrical body that holds the air bag, a sphygmomanometer body having the first pump and the second pump, and the armband portion and the It is characterized by being formed separately from the sphygmomanometer body.
With the above configuration, even when the place where the sphygmomanometer body is installed is away from the measurer, it is possible to perform measurement without applying abdominal pressure in a state where the measurer is stretched in the sitting position. That is, a simple correct operation of simply lifting the armband and putting in the arm can take a relaxed and correct measurement posture without squeezing the abdomen. An air bag for inserting an upper arm to pressurize a blood vessel, a first pump and a second pump for supplying air into the air bag, a first drive unit for driving the first pump, and the second pump A second drive unit that drives the first drive unit, and controls the drive of the first pump by giving a command to the first drive unit, and controls the drive of the second pump by giving a command to the second drive unit, When detecting a pulse wave of a blood vessel, the first pump and the second pump may be driven by different outputs and may have a control unit that is rotated at different rotational speeds.
That is, as described above, in the case where the first pump and the second pump for driving the electronic blood pressure monitor are provided, it is preferable in terms of efficiency to drive at least one of the first pumps at all outputs. Of course, avoiding only that point and not driving any pump at “full output” is nothing but a formally avoiding the idea of the present invention (an alternative invention). Therefore, the case where the control unit that drives the second pump at an output lower than the output of the first pump when detecting the pulse wave of the blood vessel is also included in the scope of the present invention. Of course.

  According to the present invention, even when two pumps are driven to supply air into the air bag to pressurize the upper arm blood vessel, an accurate blood vessel pulse wave can be obtained, and thus the armband It is possible to provide an electronic sphygmomanometer that can take a relaxed and correct measurement posture without squeezing the stomach with a simple operation of lifting the arm and putting the arm.

It is a perspective view which shows preferable embodiment of the electronic blood pressure monitor of this invention from the front side. It is a perspective view which shows an electronic blood pressure monitor from the rear side. FIG. 3A is a perspective view showing a state in which the armband portion of the electronic sphygmomanometer and the sphygmomanometer body are separated, and FIG. 3B shows a state in which the upper arm of the measurer is inserted into the armband portion. It is a perspective view. It is a perspective view which shows the structural example of an arm band part. It is sectional drawing which shows the example of an internal structure of an arm band part. 6A is a perspective view showing the unit UT of the outer cloth and the air bag, FIG. 6B is a perspective view of the unit UT as seen from another direction, and FIG. It is a perspective view which shows the state which folded unit UT. FIG. 7A is a perspective view showing an air bag and a microphone, and FIG. 7B is a view showing an air bag, an outer cloth, an inner cloth cover, and a microphone. It is a figure which shows the example of a sheet | seat which forms an air bag. It is a figure which shows the example of a process which forms an air bag. It is a figure which shows a mode that the inner surface of an air bag is contacting the to-be-measured surface of a measurement person. It is a block block diagram of an electronic sphygmomanometer. It is a figure which shows the example which the pump pulsation which is a beat (beat) produced by the slight difference of the rotation speed of two pumps generate | occur | produced. It is a figure which shows the example of a waveform with which the pulsation of a pump has overlapped with the pulse wave of the blood vessel which is needed originally. It is a flowchart which shows the process of drive-controlling a 1st pump and a 2nd pump separately by a 1st drive part and a 2nd drive part, respectively. It is a figure which shows the cuff internal pressure curve KC which shows the relationship between the pressure in an air bag, and time. It is a figure which shows the comparison of the relationship between the internal pressure of an air bag, the flat state of a blood vessel, and the magnitude | size of the detected pulse wave.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing a preferred embodiment of the electronic sphygmomanometer of the present invention from the front side, and FIG. 2 is a perspective view showing the electronic sphygmomanometer from the rear side. FIG. 3A is a perspective view showing a state in which the armband portion of the electronic sphygmomanometer and the sphygmomanometer body are separated, and FIG. 3B shows a state in which the upper arm of the measurer is inserted into the armband portion. It is a perspective view.
The electronic sphygmomanometer 1 shown in FIGS. 1 to 3 is also referred to as an automatic electronic sphygmomanometer, can separate the armband portion 2 from the sphygmomanometer main body 10, and measures even if the place where the sphygmomanometer main body 10 is installed is away from the measurer A person is an electronic sphygmomanometer of a type (hereinafter referred to as a “sl-in type”) that can be measured in a state where his / her back is stretched and no abdominal pressure is applied. This electronic sphygmomanometer 1 is a device that uses the Rivaloch Korotkoff method as an example of a blood pressure measurement method, and detects blood pressure by detecting the Korotkoff sound (K sound). As shown in FIGS. 1 to 3, the electronic sphygmomanometer 1 includes an armband portion 2 and a sphygmomanometer body 10. The armband portion 2 and the sphygmomanometer body 10 are separate, and the armband portion 2 can be fixed to the sphygmomanometer body 10 and the armband portion 2 can be separated from the sphygmomanometer body 10 as shown in FIG. ing.

  As shown in FIG. 3B, this electronic sphygmomanometer 1 is a through-in sphygmomanometer that measures the blood pressure by inserting the upper arm T of the measurer from the insertion opening 11P of the armband portion 2 along the direction D1. It is. The armband part 2 and the sphygmomanometer body 10 are electrically connected by a wire (electric signal line) 3, and the armband part 2 and the sphygmomanometer body 10 are connected by a flexible tube 4 that is an air supply / exhaust passage. Has been.

First, the structure of the sphygmomanometer body 10 will be described with reference to FIGS.
As shown in FIG. 1, the sphygmomanometer body 10 includes a casing 30 and a display unit 31. The casing 30 is a member having a thin internal space made of plastic, for example, and has an inclined upper surface portion 32, a front end surface portion 33, a rear end surface portion 34, side surface portions 35 and 36, and a bottom surface portion 42. .
As shown in FIG. 1, an inclined display portion 31 is disposed on the upper surface portion 32 of the casing 30 so that the measurer can easily confirm the display content of the display portion 31. The casing 30 is provided with a start / stop button 37 as an example of a measurement start operation unit, a memory call / time / alarm setting button 38, a mode selection button 39, and a hollow portion 40. This button is used to start or stop the blood pressure measurement operation when the measurer presses the start / stop button 37.

  In FIG. 1, when setting the time, for example, by simultaneously pressing and holding the memory call / time / alarm setting button 38 and the mode selection button 39, the display unit can be operated as an operation / setting / input function. A time setting screen is displayed at 31, and the time displayed on the time setting screen can be set while being selected by the memory call / time / alarm setting button 38.

  In FIG. 1, for example, by pressing the memory call / time / alarm setting button 38, for example, 100 blood pressure measurement records in the past can be displayed on the display unit 31. The maximum blood pressure value, the minimum blood pressure value, the pulse rate, and the date and time displayed on the display unit 31 can be displayed in order each time the memory call / time / alarm setting button 38 is pressed. The mode selection button 39 is a button that is pressed only when the measurer does not store the maximum blood pressure value, the minimum blood pressure value, the pulse value, and the pulse pressure in the memory unit 69, for example.

  As shown in FIG. 3, a recessed portion 40 is formed in the central portion of the upper surface portion 32 of the casing 30 along the Y direction. The recessed portion 40 is formed from the central portion of the casing 30 to the rear end surface portion 34. The recessed portion 40 has a semicircular portion 40P and a rectangular portion 40R. A circular start / stop button 37 is arranged at the center. A groove portion 41 is formed in the rectangular portion 40 </ b> R of the recessed portion 40.

As shown in FIG. 3, a magnet 40 </ b> M is disposed in the casing 30 in the vicinity of the start / stop button 37 and the groove portion 41 of the recessed portion 40. The magnet 40M is, for example, a rectangular plate-shaped permanent magnet, but is not particularly limited to a shape, and may be a circular shape or an elliptical shape. Further, the magnet 40M may be exposed to the outside of the casing 30.
The display unit 31 is disposed along the X direction between the recessed portion 40 and the front end surface portion 33 in FIG. For example, a liquid crystal display device can be used as the display unit 31. As shown in FIG. 1, for example, the display unit 31 includes a maximum blood pressure value, a minimum blood pressure value, a pulse rate, a pulse pressure, and a display mark during measurement operation. Various measurement values such as battery replacement display marks can be displayed.

  As shown in FIGS. 1 and 2, the side portions 35 and 36 are formed in a curved surface so that the measurer can easily hold the blood pressure monitor main body 10. The memory call / time / alarm setting button 38 and the mode selection button 39 are arranged in the vicinity of the display unit 31 on the upper surface 32. As shown in FIG. 1, a speaker 43, two pumps (first pump) 44, a pump (second pump) 45, an exhaust valve 46, a control valve 47, and a control system are provided inside the casing 30. A circuit board 48 including the memory unit 69 is disposed. The speaker 43 is provided to output a voice guide or a music guide.

Next, the structure of the armband portion 2 will be described with reference to FIGS. 1 to 3 and FIGS. 4 and 5.
FIG. 4 is a perspective view showing a structural example of the armband portion 2. FIG. 5 is a cross-sectional view showing an example of the internal structure of the armband portion 2.
As shown in FIG. 3B, the armband portion 2 can be inserted into the upper arm T as shown in FIGS. 1 and 2 in order to insert and compress the upper arm T of the measurer during blood pressure measurement. It has a substantially cylindrical structure (tubular body) with both ends cut off. Thus, unlike the normal armband portion, the armband portion 2 does not need to be wound around the upper arm T of the measurer and can be inserted into either the left or right upper arm T, and the measurer can easily measure blood pressure. Can do.

As shown in FIGS. 4 and 5, the armband portion 2 includes a hard main body case 11, an air bag (also referred to as a cuff) 14, an outer cloth 16, and an inner cloth cover 17 </ b> C.
The body case 11 shown in FIGS. 4 and 5 is formed of, for example, plastic and has a substantially cylindrical structure, and has an opening 11P and an opening 11R. As shown in FIG. 1, the main body case 11 is formed so as to taper in the direction D1, and the diameter L1 of the opening 11P is larger than the diameter L2 of the opening 11R. The main body case 11 has, for example, a substantially fan-shaped grip 11H on the opening 11R side.
For example, the operation of inserting the upper arm T of the left arm shown in FIG. 5 into the insertion hole 77 in the D1 direction or removing the upper arm T in the opposite direction can be performed with the gripping part 11H with the right hand. Further, the operation of inserting the upper arm T of the right arm into the insertion hole 77 in the direction D1 or removing the upper arm T in the opposite direction can be performed by holding the holding portion 11H with the left hand. Thereby, the measurer can easily perform the attaching operation or the detaching operation of the armband portion 2 with respect to either the left or right upper arm T.

  As shown in FIGS. 1 and 3, a magnetic adsorption plate member 210 as an example of a magnetic adsorption member is provided on the lower portion of the main body case 11. The plate member 210 is, for example, a metal plate, is formed so as to be long along the axial direction of the main body case 11, and is magnetically attracted by the magnet 40 </ b> M of the sphygmomanometer main body 10. The plate member 210 and the magnet 40M constitute a fixing means 250 for fixing (or coupling) the armband portion 2 to the blood pressure monitor main body 10.

The fixing means 250 has such a force that the binding force between the sphygmomanometer body 10 and the armband part 2 is released when the armband part 2 is lifted from the sphygmomanometer body 10. Thereby, when the measurer does not measure the blood pressure, the armband portion 2 does not roll easily from the sphygmomanometer main body 10, and when the measurer intends to measure the blood pressure, the armband portion 2 Does not become difficult to take from the sphygmomanometer body 10. Thereby, even if the armband part 2 is a separate body from the sphygmomanometer main body 10, it is easy to use.
More preferably, the force with which the magnet 40M magnetically attracts the plate member 210 can be set so as to exceed the weight of the sphygmomanometer body 10, for example. Thereby, when the measurer carries the electronic sphygmomanometer 1, when the measurer lifts only the armband part 2 without holding the sphygmomanometer body 10, only the sphygmomanometer body 10 from the armband part 2. Inadvertent falling can be prevented.

  Further, as already described, since the plate member 210 is formed to be elongated along the axial direction of the main body case 11, the armband portion 2 is magnetically attracting the blood pressure monitor main body 10. The sphygmomanometer body 11 can be moved in the Y direction along the recessed portion 40 of the sphygmomanometer body 11. As a result, the measurer can move the armband portion 2 with respect to the sphygmomanometer body 10 in the Y direction while maintaining the magnetic attraction force. 2 is retracted, and the inconvenience that the display unit 31 becomes invisible by the armband unit 2 can be solved. For this reason, the measurer can easily confirm the display content of the display unit 31 and the usability is improved.

  Furthermore, as shown in FIG. 1, the start / stop button 37 is located at the lower part of the armband portion 2 when the armband portion 2 is disposed in the recessed portion 40 of the sphygmomanometer body 10. That is, the measurer cannot press the start / stop button 37 when the armband portion 2 is stored. When the measurer removes the armband portion 2 from the depression 40 of the sphygmomanometer body 10 against the magnetic attractive force, the start / stop button 37 is exposed, and the measurer presses the start / stop button 37. Can be pressed.

  The air bag 14 shown in FIGS. 4 and 5 is formed of a stretchable material such as vinyl chloride, urethane, synthetic rubber, or natural rubber. The upper arm T is expanded into the air bag 14 by being inflated by supplying air through the tube 4 by the operation of the first pump 44 and the second pump 45 shown by broken lines in the blood pressure monitor main body 10 shown in FIG. Squeeze. Since the internal pressure of the air bag 14 is reduced at a constant speed, the air can be gradually exhausted from the air bag 14 by the control valve 47, and when the measurement is completed, the air is removed from the air bag 14 by the exhaust valve 46. Can be exhausted quickly. The detailed structure of the air bag 14 will be described later.

  The outer cloth 16 shown in FIGS. 4 and 5 is disposed between the outer side of the air bag 14 and the inner side of the main body case 11 and corresponds to an outer member that is a deformable and non-stretchable cloth member. The inner cloth cover 17C shown in FIGS. 4 and 5 is also called cuffing, and can cover the inside of the air bag 14. By arranging this inner cloth cover 17C, the measurer can smoothly insert and remove the upper arm. You can. The inner cloth cover 17C can be detachably disposed inside the air bag 14 described above, and includes a stretchable cloth portion 17D and two O-ring-shaped ring members 17F and 17G. The cloth portion 17D is formed of a slip stretch material such as nylon or spandex that can expand and contract in both the length direction and the circumferential direction.

6A is a perspective view showing the unit UT of the outer cloth 16 and the air bag 14, and FIG. 6B is a perspective view of the unit UT seen from another direction. ) Is a perspective view showing a state in which the unit UT is folded.
As shown in FIGS. 6A and 6B, the unit UT can be bent into four to form an opening G having a substantially square cross section. Since the unit UT has the four bent portions 200, the unit UT can be easily folded as shown in FIG.
7A is a perspective view showing the air bag 14 and the microphone M, and FIG. 7B is a view showing the air bag 14, the outer cloth 16, the inner cloth cover 17C, and the microphone M. As shown in FIG. 7, two microphones M are attached to the air bag 14, and the two microphones M face each other.

Here, a structural example of the air bag 14 will be described.
FIG. 8 shows an example of a sheet for forming the air bag 14.
The sheet SW shown in FIG. 8 is, for example, a transparent plastic sheet having a substantially rectangular shape, and is formed of, for example, a substantially rectangular plastic sheet having no stretchability, for example, a polyurethane sheet. The sheet SW includes a connecting pipe with filter 220, a cord hook 221, four broken line portions 222, joint portions 223 and 224, and two microphone holding portions 225.
The connection pipe 220 connects the ends of the tube 4 shown in FIG. The cord hook 221 hangs the wire 3 and the tube 4 shown in FIG. The joining portions 223 and 224 form the air bag 14 by thermocompression bonding. Each of the microphone holding units 225 can hold the microphone M. The sheet SW can be bent at the four broken line portions 222 to form the air bag 14 having the shape shown in FIG.

FIG. 9 shows an example of a process for forming the air bag 14. FIG. 10 is a diagram illustrating a state in which the inner surface of the air bag 14 is in contact with the measurement target surface HM of the measurer.
As shown in FIG. 9A, the sheet SW is bent along the folding lines 226 and 227 to join the joining portions 223 and 224 as shown in FIG. 9B. Then, as shown in FIG. 9C, the air bag 14 is completed by bending at four broken line portions 222. The air bag 14 includes four side portions 231, 232, 233, and 234.
As shown in FIG. 8B, three spacers 240 are arranged in the air bag 14 at intervals. The spacer 240 is a rectangular parallelepiped member that can be elastically deformed, such as a plastic sponge. Thereby, it can prevent that the air bag 14 collapses more than necessary because the spacer 240 is arrange | positioned.
Further, as shown in FIGS. 8B and 10, the width W of the air bag 14 is preferably 12 cm or more. Since the blood pressure cannot be measured correctly unless the inside of the air bag 14 is in contact with the surface to be measured HM of at least 8 cm, the width W of the air bag 14 needs to be 12 cm or more in order to make contact with 8 cm or more. It is.

Next, FIG. 11 is a block diagram of the electronic blood pressure monitor 1 of FIG.
A circuit block of the electronic sphygmomanometer 1 shown in FIG. 11 will be described. The circuit block of the electronic blood pressure monitor 1 is shown. As shown by the broken line of the circuit block of the electronic sphygmomanometer 1, the sphygmomanometer body 10 includes a Korotkoff sound (K sound) detection system 50, a pressurization system 51, an exhaust system 52, a pressure detection system 53, and a power supply system. 54, an audio system 55, and a control system 56.

  The control system 56 includes a drive unit 58 of the display unit 31, a timer 59, a memory unit 69, and the like. The drive unit 58 of the display unit 31 controls the display unit 31 to display items to be displayed. The memory unit 69 is a ROM (read only memory) in which a program to be processed by the CPU (central processing unit) of the control system 56 is stored. The timer 59 counts various operation times. The operation unit 57 is electrically connected to the control system 56, and includes the start / stop button 37, the memory call / time / alarm setting button 38, and the mode selection button 39 described above.

  A Korotkoff sound (K sound) detection system 50 in FIG. 11 includes two microphones M of the armband portion 2, a K sound detection circuit unit 60, a noise sensor 15, and a noise sensor detection circuit unit 61. The two microphones M are electrically connected to the control system 56 via the K sound detection circuit unit 60. As shown in FIG. 1, the two microphones M are disposed at positions facing each other with respect to the opening 16 (positions near and far from the artery of the upper arm T).

  The two microphones M in FIG. 11 detect the blood flow sound (blood vessel information) of the measurer, and the K sound detection circuit unit 60 detects the K sound from the blood flow sound and transmits the K sound signal to the control system 56. . The control system 56 detects the Korotkoff sound, the generation point and the disappearance point of the Korotkoff sound from the input K sound signal. The noise sensor 15 detects vibration noise that enters the microphone M from the outside, and sends a noise signal to the control system 56 via the noise sensor detection circuit unit 61. Thereby, the control system 56 improves the accuracy of the K sound detection signal by removing noise from the K sound signal.

A pressure detection system 53 shown in FIG. 11 includes a piping part 63, a pressure sensor 64, and a tube 4. The pressure sensor 64 is electrically connected to the control system 56 via an amplifier, a filter, and an integration A / D unit 65. The control system 56 as a control unit detects a K sound signal.
That is, after stopping the blood flow in the blood vessel by pressurization, the pressure is reduced, the pressure at the time when the first K sound signal when the blood flow again is detected is set to the maximum blood pressure value, and further the pressure reduction is continued. When the K cross section is sufficiently expanded and no K sound signal is detected, the pressure at the time when the last K sound signal is detected is set to the minimum blood pressure value. Further, the control system 56 calculates the pulse rate from the appearance interval of the vascular pulsation or the K sound signal obtained from the maximum blood pressure value and the minimum blood pressure value.

The pressurization system 51 includes a first pump 44, a second pump 45, a drive unit 62 </ b> A of the first pump 44, and a second drive unit 62 </ b> B of the second pump 45. In response to a command from the control system 56 as a control unit, for example, the first drive unit 62A controls the rotation of the first pump 44 by PWM (pulse width control) control, and the second drive unit 62B The pump 45 can be rotationally controlled by PWM (pulse width control) control. As described above, the two first and second pumps 44 and 45 can be separately driven and controlled by the different first and second drive units 62A and 62B.
The first pump 44 and the second pump 45 are connected to the air bag 14 of the armband portion 2 through the piping portion 63 of the pressure detection system 53.
In the electronic sphygmomanometer 1, after the inside of the armband portion 2 is pressurized by the first pump 44 and the second pump 45, the pressure sensor 64 is used to evacuate and depressurize the inside of the armband portion 2. At the same time, the Korotkoff sound (K sound) is detected using the microphone M. The electronic sphygmomanometer 1 detects the K sound signal and the generation point and disappearance point of the K sound signal, thereby calculating the maximum blood pressure value and the minimum blood pressure value, and the calculated maximum blood pressure value and the minimum blood pressure value. Can be displayed on the display unit 31.

  Next, the exhaust system 52 will be described. The exhaust system 52 includes two drive units 66 and 67, an exhaust valve (forced exhaust unit) 46, and a control valve (decompression control unit) 47. The exhaust valve 46 and the control valve 47 are arranged in the middle of the piping part 63. The control system 56 commands the drive unit 66 to open and close the exhaust valve 46, and the control system 56 commands the drive unit 67 to open and close the control valve 47.

  The power supply system 54 includes a battery 68, a power supply control unit 69C, and a power supply monitoring unit 70. The battery 68 is, for example, a lithium ion battery that can be repeatedly charged, but the type is not particularly limited, and may be a dry battery or the like. The voltage of the battery 68 is controlled by the power control unit 69C and supplied to the control system 56, and also serves as a driving power source for the pumps 44 and 45 and a power source supplied to the sound control unit 71. The power monitoring unit 70 monitors the remaining amount of the battery 68 and the like. Moreover, a 100V commercial power supply can be used by using an AC adapter.

  The audio system 55 includes an audio control unit 71 and an amplification unit 72. The voice control unit 71 and the amplification unit 72 are controlled by a command from the control system 56. The voice control unit 71 sends voice guidance data or music data to the amplifying unit 72 and amplifies it according to a command from the control system 56, so that the speaker 43 generates a voice announcement and a music guidance announcement. can do.

Next, an example of performing blood pressure measurement according to the procedure of the blood pressure measurement program using the electronic blood pressure monitor 1 described above will be described.
The blood pressure measurement program has, for example, a normal mode M1, a systolic blood pressure mode M2, and a diastolic blood pressure mode M3. Below, these modes are demonstrated in order.
(Normal mode M1)
The plate member 210 of the main body case 11 of the armband portion 2 shown in FIG. 1 is formed so as to be elongated along the axial direction of the main body case 11 as already described, and the armband portion 2 is formed of this plate member. 210, the magnet 40M of the sphygmomanometer main body 10 is magnetically attracted and coupled to the recessed portion 40 of the sphygmomanometer main body 10. As shown in FIG. 3, the measurer lifts the armband portion 2 from the hollow portion 40 of the sphygmomanometer body 10 against the magnetic attractive force of the magnet 40 </ b> M, thereby lifting the armband portion 2 to the sphygmomanometer body. It can be easily removed from the ten recessed portions 40. Thus, when the measurer measures the blood pressure, the armband portion 2 can be easily detached from the blood pressure monitor main body 10. Thereby, even if the place where the sphygmomanometer main body 10 is installed is away from the measurer, the measurer can easily measure blood pressure in a state where his / her back is stretched and no abdominal pressure is applied.

Preferably, the force with which the magnet 40M magnetically attracts the plate member 210 can be set so as to exceed the weight of the sphygmomanometer body 10, for example. Thereby, when the measurer carries the electronic sphygmomanometer 1 and only the arm band part 2 is lifted without holding the sphygmomanometer body 10, only the sphygmomanometer body 10 falls carelessly from the arm band part 2. Can be prevented.
As shown in FIG. 1, when the armband portion 2 is placed in the recessed portion 40 of the sphygmomanometer main body 10, the start / stop button 37 is positioned below the armband portion 2, The start / stop button 37 is not exposed to the outside unless the armband portion 2 is lifted and removed from the recessed portion 40 of the sphygmomanometer body 10. Accordingly, the measurer can press the start / stop button 37 after the armband portion 2 is lifted and is ready to perform measurement through the upper arm T. Therefore, the start / stop button 37 is inadvertently not measured. There is no such thing as pushing.

Next, the measurer inserts, for example, the right upper arm from the opening 11P to the opening 11R while holding the holding part 11H. When the measurer presses the mode selection button 39 shown in FIG. 1 to select the normal mode M1, the measurer presses the start / stop button 37 of FIG. 1 to start blood pressure measurement. The pumps 44 and 45 in FIG. 1 pressurize the air bag 14 at full speed, and the two microphones M detect the blood flow sound (blood vessel information) of the measurer and the arm band part 2 is at full speed until the pulse disappears. The air bag 14 is pressurized. When the control system 56 determines the disappearance of the pulse, the pressure increase in the armband 2 is stopped.
Then, the inside of the armband 2 is gradually reduced in pressure (for example, 2 to 5 mmHg / second), and the maximum blood pressure value and the minimum blood pressure value are detected. The systolic blood pressure value and the diastolic blood pressure value are displayed on the display unit 31 in FIG. 1, and the pumps 44 and 45 and the exhaust valve 46 are operated to rapidly exhaust the air bag 14 in the armband unit 2. Thus, when the maximum blood pressure value and the minimum blood pressure value can be displayed on the display unit 31, the pressure on the upper arm of the measurer can be immediately eliminated by quickly exhausting the air bag 14 in the armband portion 2. , The burden on the measurer can be reduced.

(High blood pressure mode M2)
Further, the measurer inserts the right upper arm, for example, from the opening 11P to the opening 11R while holding the holding part 11H. When the measurer presses the mode selection button 39 shown in FIG. 1 to select the systolic blood pressure mode M2, the measurer presses the start / stop button 37 in FIG. 1 to start blood pressure measurement. The pumps 44 and 45 of FIG. 1 pressurize the air bag 14 at full speed, and the two microphones M detect the blood flow sound of the measurer and the air bag 14 in the armband portion 2 at full speed until the pulse disappears. Boost. When the control system 56 determines the disappearance of the pulse, the pressurization of the air bag 14 in the armband 2 is stopped.

  Then, the pressure is gradually reduced (for example, 2 to 5 mmHg / second), and the speaker 43 in FIG. Announce and detect only systolic blood pressure. Thereafter, the loudspeaker 43 in FIG. 1 announces the maximum blood pressure value and the pulse rate with a voice guide, and operates the pumps 44 and 45 and the exhaust valve 46 to rapidly exhaust the air bag 14 in the armband portion 2. As a result, the pressure on the upper arm of the measurer can be immediately eliminated by quickly exhausting the inside of the armband part 2 while announcing the maximum blood pressure value and the pulse rate with a voice guide, thereby reducing the burden on the measurer. .

(Minimum blood pressure mode M3)
Further, the measurer inserts the right upper arm, for example, from the opening 11P to the opening 11R while holding the holding part 11H. Thereafter, when the measurer presses the mode selection button 39 shown in FIG. 1 to select the minimum blood pressure mode M3, the measurer presses the start / stop button 37 of FIG. 1 to start blood pressure measurement. The pressure is gradually increased (for example, 2 to 5 mmHg / second), and the speaker 43 in FIG. 1 announces the pressure value of the air bag 14 in the armband portion 2 for each cuff value at the time of pressure increase, for example, every 10 mmHg, Detect minimum blood pressure. Thereafter, when the pulse disappears, the pressurization is stopped, and the speaker 43 in FIG. 3 announces the minimum blood pressure value by voice guide, and the pumps 44 and 45 and the exhaust valve 46 are operated to air in the armband 2. The bag 14 is quickly exhausted.

By the way, normally, even if the first pump 44 and the second pump 45 are driven at the same rotational speed, there is a variation between the first pump 44 and the second pump 45 due to variations in manufacturing the first pump 44 and the second pump 45. A slight speed difference may occur.
FIG. 12 shows an example in which pump pulsation, which is a beat caused by a slight difference in the rotation speed between two pumps, is generated. As shown in FIG. 12A, when the frequencies F1 and F2 of the two rotation speeds close to each other are synthesized, the frequency of the difference between the two rotation speeds (very low frequency) as shown in FIG. 12B. F3 will appear. For example, if the difference in the rotational speed between the two pumps is 3%, if the rotational speed is 2600-3000 rpm, 3000 rpm / 60 sec = 50 Hz and 50 Hz × 0.03 = 1.5 Hz beat is generated. To do.

FIG. 13A shows a waveform example in which the pulsation MH of the pump is superimposed on the pulse wave WH of the blood vessel that is originally required. FIG. 13 shows the pulsation MH of the pump that is applied to the air bag when the air bag pressurizes the surface to be measured, and the pulse wave WH until the blood vessel is compressed and collapsed, that is, the maximum blood pressure. . At this time, since the pulsation MH of the pump is superimposed on the pulse wave WH of the blood vessel, the original pulse wave waveform TH as shown in FIG. 13B cannot be obtained. That is, when two pumps are driven to supply air into the air bag to pressurize the upper arm blood vessel, a pump pulsation occurs between the two pumps, and this pump pulsation becomes a pulsation of the blood vessel. As a result, the necessary blood vessel pulse wave may not be obtained, and accurate measurement of the maximum blood pressure and the minimum blood pressure may not be possible.
Therefore, in the embodiment of the present invention, the beat is not generated between the two pumps and the pump pulsation is not generated between the two pumps, so that the two pumps are driven and the air is put into the air bag. The following measures have been taken so that an accurate pulse wave of the blood vessel can be obtained even if the upper arm blood vessel is pressurized.

FIG. 14 is a flowchart showing a process of driving and controlling the first pump 44 and the second pump 45 separately by the first driving unit 62A and the second driving unit 62B. FIG. 15 shows a cuff internal pressure curve KC showing the relationship between the pressure in the air bag and time.
A drive control example of the first pump 44 and the second pump 45 will be described with reference to the block diagram of the electronic sphygmomanometer 1 of FIGS. 14 and 11. The pump drive control flow shown in FIG. 14 includes steps S1 to S8. The blood pressure measurement section (1) in step S1 shown in FIG. 14 to the blood pressure measurement section (8) in step S8 corresponds to the blood pressure measurement sections (1) to (8) in the cuff internal pressure curve KC shown in FIG. is doing.

Step S1 in FIG. 14 corresponds to the blood pressure measurement section (1) shown in FIG. The measurer removes the armband 2 shown in FIG. 1 from the blood pressure monitor main body 10 and presses the start / stop button 37 in FIG. From the start of pressurization of the air bag 14 to 40 mmHg, the first pump 44 and the second pump 45 shown in FIG. Pressurization is started by supplying air into the air bag 14 at full speed (full output). Thereby, the internal pressure of the air bag 14 starts to increase.
A pressure sensor 64 built in the blood pressure monitor main body 10 shown in FIG. 11 measures the internal pressure of the air bag 14. Thereafter, the first pump 44 and the second pump 45 pressurize the air bag 14 at 100% full speed (full output) until the internal pressure of the air bag 14 reaches 40 mmHg from the start of pressurization. Thereby, the rise time at the time of starting pressurization of an air bag can be shortened by driving both a 1st pump and a 2nd pump by all the outputs. During this pressurization, pump pulsation, which is a minute change in the internal pressure of the air bladder 14 due to a change in the blood vessel pressure, is not observed.

Step S2 corresponds to the blood pressure measurement section (2) shown in FIG. When the internal pressure of the air bag 14 reaches 40 mmHg, the pump 44 maintains the operation of supplying air to the air bag 14 at 100% full speed while the pulse wave of the blood vessel is being observed, but the pump 45 does not output 100%. For example, the output is reduced to 70%. Thus, while the pressure is increased from 40 mmHg to (stop target pressure—10 mmHg), the first pump 44 pressurizes at 100%, but the second pump 45 pressurizes at 70%.
As a result, there is a large difference in rotational speed between the first pump 44 and the second pump 45, so that pump pulsation does not occur and measurement of the pulsation of a blood vessel that does not contain pump pulsation (resonance) is possible. It becomes possible. This pulse wave of the blood vessel can be extracted by performing signal processing while paying attention to a minute change in the internal pressure signal of the air bag 14 detected by the same pressure sensor 64.
FIG. 16 shows a comparison of the relationship between the internal pressure of the air bladder, the flat state of the blood vessel, and the magnitude of the detected pulse wave. As shown in FIG. 16, the pulse wave of the blood vessel is not detected when the internal pressure of the air bag 14 (cuff internal pressure) is lower than the minimum blood pressure and higher than the maximum blood pressure because of the difference between the internal pressure of the blood vessel and the internal pressure of the air bag.

  Step S3 corresponds to the blood pressure measurement section (3) shown in FIG. 15, and the control system 56 in FIG. 11 sets the pressurization stop pressure (stop target pressure) that exceeds the maximum blood pressure from the observed pulse wave. Calculate and determine. Here, by observing a change in the amplitude of the pulse wave of the blood vessel from the relationship between the difference between the blood pressure of the blood vessel, the internal pressure of the blood vessel, and the internal pressure of the air bag 14, the pressurization stop pressure (stop) exceeding the maximum blood pressure is observed. The target pressure can be roughly estimated. By the way, the pressurization stop pressure (stop target pressure) is set to the vicinity of +30 mmHg to +60 mmHg rather than the maximum blood pressure. This is because a minimum of about +30 mmHg is necessary to measure the systolic blood pressure, and not to raise more than +60 mmHg so as not to place a burden on the measurer. The point of the section (3) is a point at which the amplitude gradually decreases after the pulse wave shows the maximum amplitude, and it can be estimated how many mmHg of pressurization will no longer be observed.

Step S4 corresponds to the blood pressure measurement section (4) shown in FIG. When the internal pressure of the air bag 14 reaches a pressure that leaves another 10 mmHg until the stop target pressure is reached, the first pump 44 is stopped to prevent the pressure in the air bag from decreasing, but the output of the second pump 45 is reduced. 70%. That is, during the period from (stop target pressure—10 mmHg) to the stop target pressure, the first pump 44 is stopped to prevent pressure drop, but the output of the second pump 45 is maintained at 70%.
The estimated pressurization stop pressure (stop target pressure) is updated by observing the pulse wave amplitude each time pressurization is performed, the first pump 44 is stopped at the remaining 10 mmHg, and the output of the second pump 45 is output. 70%. This is because when the pumps 44 and 45 for pressurization are stopped at a stop at the stop target pressure, the internal pressure of the air bag is greatly reduced due to the pressure difference between the vicinity of the pressure sensor and the internal pressure of the air bag. As a result, the target stop pressure can be smoothly reached without causing a sudden drop in the pressure of the air bladder.

Step S5 corresponds to the blood pressure measurement section (5) shown in FIG. The stop target pressure is reached, pressurization is stopped, and pressure reduction is started. Using the microphone M, blood pressure measurement using the K sound is started.
Step S6 corresponds to the blood pressure measurement section (6) shown in FIG. 15, and detects the K sound using the microphone M to measure the maximum blood pressure.
Step S7 corresponds to the blood pressure measurement section (7) shown in FIG. 15. After measuring the minimum blood pressure when the K sound disappears using the microphone M, the air in the air bag 14 is rapidly exhausted. End blood pressure measurement.
Step S8 corresponds to the blood pressure measurement section (8) shown in FIG. 15, and when it reaches 20 mmHg or less, the blood pressure measurement result can be displayed on the display unit 31 shown in FIG.

  By the way, in the above-described drive control example, the second pump 45 preferably pressurizes the air bag by reducing the output to 70% in step S2. However, the decrease value of the output of the second pump 45 is not limited to 70%, but may be between 60% and 80%. If the output of the second pump 45 is less than 60%, the second pump 45 rotates at a low speed, which not only consumes the battery 68 shown in FIG. Since the air bag cannot be sent to the measuring object, it is not preferable because the air bag may not be able to apply the necessary pressure to the surface to be measured. Further, if the output of the second pump 45 exceeds 80%, a beat may occur between the first pump 44 and the second pump 45, which is not preferable.

  By the way, in the electronic sphygmomanometer 1 shown in FIG. 1, the measurer removes the armband part 2 from the sphygmomanometer body 1 and presses the start / stop button 37 of the sphygmomanometer body 10 for a certain time or longer. Press to set the long press mode. That is, when the start / stop button 37 in FIG. 11 is pressed for a certain time or longer, the control system 56 in FIG. 11 presses the start / stop button 37 by giving a command to the pump drive units 62A and 62B. Air can be manually supplied from the pumps 44 and 45 to the air bag 14 only in the meantime. When the long press mode is selected in this manual, that fact can be displayed on the display unit 31 shown in FIG.

As described above, when the measurer manually sends air to the air bag 14 to pressurize the surface to be measured, for example, the measurer recognizes his / her highest blood pressure value to some extent, and the recognized highest blood pressure value. As an example, if the pressure is 130 mmHg, when the pressure is automatically increased, the blood pressure increases to 180 mmHg. For example, if the pressure is manually increased to 150 mmHg, the maximum blood pressure value can be measured. In this way, when the measurer knows the maximum blood pressure value to some extent in advance, the air bag is placed so that the blood pressure value is slightly higher than the maximum blood pressure value that the measurer has grasped by manual operation. Since it is only necessary to gradually reduce the air after supplying air, it is not necessary to strongly press the upper arm, and the usability is improved.
In the electronic sphygmomanometer according to each embodiment of the present invention, even when the two pumps are driven to supply air into the air bag and pressurize the upper arm blood vessel, an accurate blood vessel pulse wave can be obtained. In the electronic sphygmomanometer of each embodiment of the present invention, the armband part can be easily detached from the sphygmomanometer body when attempting to measure, while the armband part is not detached from the sphygmomanometer body when blood pressure measurement is not performed. Can be fixed. For this reason, the measurer can improve usability when measuring blood pressure using an electronic sphygmomanometer.

By the way, this invention is not limited to the said embodiment, A various modified example is employable. For example, in the illustrated example, the grip portion 11H is substantially fan-shaped, but the shape is not limited to this, and any shape can be adopted. The display unit 31 is not particularly limited in type, for example, an organic EL device, a fluorescent display device, or the like other than a liquid crystal display device.
In the embodiment of the present invention described above, the electronic sphygmomanometer uses the Ribaroch Korotkoff method as a blood pressure measurement method, and detects blood pressure by detecting the Korotkoff sound (K sound). Other blood pressure measurement methods such as (oscillometric method) may be adopted.

  DESCRIPTION OF SYMBOLS 1 ... Electronic sphygmomanometer, 2 ... Armband part, 10 ... Blood pressure monitor main body, 11 ... Main body case (an example of a hard cylinder), ..., 11P, 11R ... opening , 16 ... outer cloth, 17 C ... inner cloth cover, 31 ... display part, 37 ... measurement start / stop button (an example of measurement start operation part, constituting fixing means), 39 ..Mode selection button, 40 ... depression, 40M ... magnet, 43 ... speaker, 44 ... first pump, 45 ... second pump, 50 ... Korotkoff sound (K sound) ) Detection system 51 ... Pressure system 52 ... Exhaust system 56 ... Control system (control unit) 62A ... First drive unit for the first pump 62B ... Second A second drive for the pump,

Claims (8)

An air bag to insert the upper arm of the measurer and pressurize the blood vessel;
A first pump and a second pump for supplying air into the air bag;
A first drive unit for driving the first pump;
A second drive unit for driving the second pump;
When a command is given to the first drive unit to control the drive of the first pump, a command is given to the second drive unit to control the drive of the second pump, and a pulse wave of the blood vessel is detected The electronic sphygmomanometer, comprising: a controller that rotationally drives the first pump at full output and drives the second pump at an output lower than the full output of the first pump.   The electronic sphygmomanometer according to claim 1, wherein the controller drives the second pump at 60% to 80% of the total output when detecting the pulse wave of the blood vessel.   The electronic sphygmomanometer according to claim 1, wherein the controller drives the second pump at 70% of the total output when detecting the pulse wave of the blood vessel.   The controller drives the first pump at full power before the pulse wave of the blood vessel is detected and until the pressure reaches 40 mmHg after air is sent into the air bag and pressurization is started. The electronic sphygmomanometer according to any one of claims 1 to 3, wherein the second pump is also driven at full output.   When the pressure of the air in the air bag approaches the stop target pressure, the control unit gives a command to the first driving unit to stop driving the first pump and commands the second driving unit. The electronic sphygmomanometer according to claim 4, wherein the second pump is driven at 70% of the total output.   After the pressure of the air in the air bag reaches the target stop pressure, the Korotkoff sound (K sound) is detected to detect the systolic blood pressure, and the systolic blood pressure is detected by the disappearance of the Korotkoff sound (K sound). The electronic sphygmomanometer according to claim 5, comprising a microphone. An armband having a rigid cylinder holding the air bag, and a sphygmomanometer body having the first pump and the second pump,
The electronic sphygmomanometer according to claim 1, wherein the armband part and the sphygmomanometer main body are formed separately. An air bag to insert the upper arm of the measurer and pressurize the blood vessel;
A first pump and a second pump for supplying air into the air bag;
A first drive unit for driving the first pump;
A second drive unit for driving the second pump;
When a command is given to the first drive unit to control the drive of the first pump, a command is given to the second drive unit to control the drive of the second pump, and a pulse wave of the blood vessel is detected The electronic sphygmomanometer, comprising: a control unit in which the first pump and the second pump are driven at different outputs and rotated at different rotational speeds.

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