JP3530890B2 - Mounting position determination device for pressure pulse wave detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting position determining device for determining whether a pressure pulse wave detecting device is mounted at a correct position on a living body.

[0002]

2. Description of the Related Art For the purpose of diagnosis, various pressure pulse wave detecting devices have been proposed in which a pressure sensor having a pressing surface presses an artery from the surface of the body, and the pressure sensor detects a pressure pulse wave.

When the pressure pulse wave detecting device detects the pressure pulse wave from the artery, the pressure pulse wave detecting device is mounted at an appropriate mounting position so that the pressure sensor can detect the pressure pulse wave from the artery. Although necessary, it is difficult to judge whether the pressure pulse wave detection device is properly mounted because the artery is located under the epidermis. Further, since the body surface has a complicated uneven shape, even if the body surface is once mounted at an appropriate position, the mounting position often shifts due to body movement or the like.

Therefore, the applicant of the present invention invented a pressure pulse wave detecting device which does not have the above-mentioned problems, and applied for a device in which it was applied to a carotid artery wave detecting device. The carotid artery wave detection device described in Japanese Patent Application No. 10-233843 is that. FIG. 1 is a front view showing a carotid artery wave detection device 10 disclosed as an example in the specification relating to the above application. When the carotid artery wave detection apparatus 10 shown in FIG. 1 is attached to the neck of a living body, the fixed sensor 56 fixed to the housing 29 presses the neck of the living body by the elastic return force of the gripping device 12 in the diameter reducing direction. Further, since the two movable sensors 58 located on both sides of the fixed sensor 56 are biased in the pressing direction of the fixed sensor 56, the two movable sensors 58 also press the living body's neck, so that the pressing position is Stabilize. Further, the carotid artery wave detection device 1
The mounting position of 0 is the vibration component AC1 of the pulse wave detected by the fixed sensor 56 in the arithmetic control circuit (not shown).
And the vibration component A of the pulse wave detected by the movable sensor 58.
Ca and ACb are compared, and the carotid artery wave detection device is arranged so that the vibration component AC1 of the pulse wave detected by the fixed sensor 56 becomes larger than the vibration components ACa, ACb of the pulse wave detected by the movable sensor 58. Since the mounting position of 10 is determined, the fixed sensor 56 can be accurately positioned above the carotid artery.

[0005]

In the pressure pulse wave detecting device as illustrated in FIG. 1, the amplitude of the pulse wave detected by the fixed sensor becomes larger than the amplitude of the pulse wave detected by the movable sensor. If the mounting position of the pressure pulse wave detection device is determined in this way, it can be mounted at an appropriate mounting position in most cases.However, even if the mounting position is determined in this way, the mounting position of the pressure pulse wave detection device remains unchanged. It may not be appropriate. That is, even when the movable sensor is closer to the artery to be measured than the fixed sensor, the amplitude of the pulse wave detected by the fixed sensor is larger than the amplitude of the pulse wave detected by the movable sensor. There is.

The present invention has been made in view of the above circumstances, and an object of the present invention is, as described above, to provide a pressure sensor having movable sensors which are movable in the pressing direction on both sides of a fixed sensor. In a pulse wave detection device, it is an object of the present invention to provide a mounting position determination device that can accurately determine whether or not the mounting position of the pressure pulse wave detection device is appropriate.

[0007]

As a result of various studies to solve the above problems, in the pressure pulse wave detecting device as shown in FIG. 1, the pressure pulse wave detected by each sensor has a positive waveform. And found that there is an inverted waveform. That is,
As shown in FIG. 2, when the signal at the time of contraction of the heart (R wave of the electrocardiographically induced waveform in FIG. 2) is detected as the reference point (start point), the minimum value min in one pulse wave is Maximum value max
It was found that there is a positive waveform detected earlier than the above, and conversely, there is an inverted waveform in which the maximum value max in one pulse wave is detected before the minimum value min. It is not clear why the pressure pulse wave is inverted in this way, but if the pressure pulse wave detector is not installed properly and the swing coupling device is swung by the pulsation of the artery during measurement, a fixed sensor is used. We found the fact that the detected waveform is an inverted waveform. The present invention was made based on such findings.

[0008]

[Means for Solving the Problems] [Means for Solving the Problems] That is, the gist of the first invention for achieving the above-mentioned object is to provide a housing having an accommodating hole whose opening is opened in the shape of an elongated hole, and a housing of the housing. A fixed sensor that presses an artery of a living body in a state of being fixed in the housing hole, and is housed in the housing hole of the housing so as to be located on both sides of the fixed sensor, and is biased in the pressing direction of the fixed sensor. As a result, at least two movable sensors that are movable in the pressing direction of the fixed sensor, a gripping device that is curved in one plane for gripping a predetermined part of the living body, and the length of the housing hole of the housing The housing of the grasping device is arranged so that the hole-shaped opening is in a direction crossing the artery and the housing is swingable about a swing center axis perpendicular to the one plane. A pressure pulse wave detection device having an oscillating connection device connected to the end, a mounting position determination device for determining the mounting position, (a) the amplitude of the pressure pulse wave detected by the fixed sensor, Amplitude determining means for respectively determining the amplitude of the pressure pulse wave detected by the at least two movable sensors, and (b) whether the pressure pulse wave detected by the fixed sensor is a positive waveform or an inverted waveform. Positive and negative determination means to determine, (c) each amplitude determined by the amplitude determination means is displayed, and the pressure pulse wave detected by the fixed sensor is a positive waveform and an inverted waveform by the positive and negative determination means. Mounting position display means for displaying which of the two is determined.

[0009]

According to this structure, the amplitude determining means allows the amplitude of the pressure pulse wave detected by the fixed sensor and the pressure pulse detected by at least two movable sensors located on both sides of the fixed sensor. The amplitude of the wave is determined, and when the positive / negative determination unit determines whether the pressure pulse wave detected by the fixed sensor is a positive waveform or an inverted waveform, the mounting position display unit determines the amplitude determination unit. Each of the amplitudes determined by and the pressure pulse wave detected by the fixed sensor is displayed as a positive waveform or an inverted waveform. When the mounting position of the pressure pulse wave detection device is appropriate, the amplitude of the pressure pulse wave detected by the fixed sensor is the largest and the pressure pulse wave is a positive waveform. It is possible to accurately determine whether or not the mounting position of the pulse wave detection device is appropriate.

[0010]

A second aspect of the present invention for achieving the above object is to provide a housing having a housing hole whose opening is opened in the shape of an elongated hole, and housing the housing. A fixed sensor that presses an artery of a living body in a state of being fixed in the hole, and is housed in the housing hole of the housing so as to be located on both sides of the fixed sensor, and urged in the pressing direction of the fixed sensor. The at least two movable sensors that are movable in the pressing direction of the fixed sensor, the gripping device that is curved in one plane to grip a predetermined part of the living body, and the long hole of the housing hole of the housing. The housing at one end of the gripping device so that the opening is in a direction crossing the artery and the housing is swingable about a swing center axis perpendicular to the one plane. A mounting position determining device for determining a mounting position of a pressure pulse wave detecting device, comprising: an oscillating connecting device connected to the swinging connecting device, wherein the amplitude of the pressure pulse wave detected by the fixed sensor is the at least two movable sensors. Greater than the amplitude of the pressure pulse wave detected by, and based on whether the pressure pulse wave detected by the fixed sensor is a positive waveform,
The pressure pulse wave detecting device further includes a mounting position determining unit that determines whether the mounting position of the pressure pulse wave detecting device is appropriate.

[0011]

With this configuration, the amplitude of the pressure pulse wave detected by the fixed sensor by the mounting position determining means is greater than the amplitude of the pressure pulse wave detected by at least two movable sensors. Since the suitability of the pressure pulse wave detection device is determined to be large and whether or not the pressure pulse wave detected by the fixed sensor is a positive waveform, the mounting position of the pressure pulse wave detection device is appropriate. Whether or not it is accurately determined.

[0012]

According to another aspect of the present invention, preferably, the mounting position display means is arranged on the two-dimensional graph constituted by a sensor position axis and an amplitude axis indicating mutual positions of the sensors, by the amplitude determining means. A graphical display of each determined amplitude, and a graphical display of the amplitude so that it is possible to identify whether the pressure pulse wave detected by the fixed sensor is a positive waveform or an inverted waveform. To do.

Further, preferably, the mounting position determining device according to the second aspect of the present invention, when the mounting position determining means determines that the mounting position of the pressure pulse wave detecting device is inappropriate,
By comparing the amplitudes of the pressure pulse waves detected by the at least two movable sensors, the fixed sensor determines the movement direction for mounting the pressure pulse wave detecting device at the optimum mounting position. It further includes a moving direction determining unit that determines a moving direction toward the movable sensor that detects a large pressure pulse wave.

Further, preferably, the mounting position determination device according to the second aspect of the present invention further includes a movement direction display means for displaying the movement direction determined by the movement direction determination means. With this configuration, when the mounting position of the pressure pulse wave detecting device is inappropriate, the moving direction display means displays the moving direction for mounting the pressure pulse wave detecting device at the optimum mounting position. Therefore, the pressure pulse wave detection device can be easily mounted at the optimum mounting position.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. In this embodiment, a case where the carotid artery wave detection device 10 is used as a pressure pulse wave detection device will be described. Therefore, first, the carotid artery wave detection device 10 will be described.

As shown in FIG. 1, the carotid artery wave detecting apparatus 10 is curved as a whole in order to hold the neck of a living body and is urged in a diameter reducing direction by an elastic restoring force. The device 12, the carotid artery wave sensor 14 attached to one end of the device 12, and the carotid artery wave sensor 14 is located inside the grasping device 12 in the one plane with respect to the one end of the grasping device 12. A swing connecting device 16 is provided that connects the gripping device 12 and the carotid artery wave sensor 14 to each other so that they can swing about a swing central axis C that is perpendicular to a plane.

The gripping device 12 has a relatively rigid and curved shape made of synthetic resin and supports the carotid artery wave sensor 14, and is elastically deformed by being curved from synthetic resin. Possible contact member 22, one end of which is fixed to the base end of the contact member 22 and the other end of which is the support portion 2.
A relatively rigid connecting member 24 that rotatably connects the support member 20 and the contact member 22 by being rotatably connected to the base end portion of 0.

The support member 20 is a carotid artery wave sensor 14
As shown in FIG. 3 which is a cross-sectional view taken along the line AA of FIG. 1, the front side member 26 and the back side member 28, which are divided by the plane parallel to the one plane, are mutually supported. It is configured by being assembled and fixed. The housing 29 of the carotid artery wave sensor 14 is also
The front side member 30 and the back side member 31 divided by the plane parallel to the above-mentioned one plane are combined with each other, and as shown in FIG.
0 and the back side member 31 are fixed.

As shown in FIG. 1, a pair of support brackets 34 are provided at the tip of the support member 20 and are provided with arcuate guide holes 33 at predetermined intervals in the width direction thereof.
Are provided so as to project to the inner peripheral side, and a pair of engaging projections 35 projectingly provided on the side surfaces of the housing 29 of the carotid artery wave sensor 14 are housed in the guide holes 33 and engaged with the inner wall surface thereof. As a result, the carotid artery wave sensor 14 is prevented from falling off the support member 20. Since the guide hole 33 is formed along an arc centered on the swing center axis C, the guide hole 3 is formed.
By guiding the engaging projection 35 by 3,
The carotid artery wave sensor 14 is connected to one end of the support member 20 so as to be swingable around a swing center axis C. Therefore, the support bracket 34 having the guide hole 33 formed therein and the engaging projection 35 constitute the swing coupling device 16.

FIG. 4 shows the front side member 26 of the support member 20 and the front side member 30 of the housing 29 of the carotid artery wave sensor 14 in order to explain the construction of the carotid artery wave detecting apparatus 10 in detail. The carotid artery wave detection device 1
It is a figure which notches and shows a part of 0.

In the carotid artery wave sensor 14, the back side member 31 of the housing 29 and the front side member 30 not shown in FIG. 4 are flat and substantially elliptical, and screw holes are formed in the columnar projection 50 of the back side member 31. The screw 32 is screwed into the shaft 52 via the front side member 30, so that the front side member 3
0 and the back side member 31 are combined with each other to form the housing 29 having the accommodation hole 54 opening in the shape of an elongated hole.

In the accommodation hole 54, a fixed sensor 56,
Two movable sensors 58a and 58b (hereinafter, simply referred to as movable sensor 58 unless otherwise distinguished) are accommodated in parallel. As shown in FIG. 3, the fixed sensor 56 is fixed to the housing 29 by a pin 60 that functions as a fixed shaft, and the two movable sensors 58 are located on both sides of the fixed sensor 56. Movable sensor 58
The pair of protrusions 64 protruding from the side surface 62 on the side opposite to the fixed sensor 56 side engages with the guide groove 66 provided in the housing 29 in the substantially radial direction, so that the guide groove 66. It is held in the housing 29 so as to be movable along.

The swing center axis C is substantially positioned on the center line of the fixed sensor 56 and near the center of the pressing surface 68 thereof so that it is substantially positioned at the center of the carotid artery when worn. The fixed sensor 56 includes a pair of pressing surfaces 68 that are pressed toward the carotid artery, a pressure detecting element 70 that detects the pressure from the pressing surfaces 68, and a pair that have a smaller mutual distance as the distance from the pressing surface 68 increases. And a side surface 72 of the side surface 72, and is housed in the housing hole 54 in a state where the end portion on the pressing surface 68 side is exposed from the housing 29. Also,
The movable sensor 58 is also provided with a pressing surface 68 and a pressure detecting element 70 similarly to the fixed sensor 56, and is opposite to the side surface 62 on the side where the protrusion 64 that engages with the guide groove 66 is provided. The side surface 74 on the side is configured such that the distance from the side surface 62 on the opposite side decreases as the distance from the pressing surface 68 increases. The length of the pressing surface 68 of the fixed sensor 56 and the pressing surface 68 of the movable sensor 58 in the direction perpendicular to the pressing direction is set to be larger than the diameter of the carotid artery (for example, 15 mm). ing.

An interposition member 78 is formed between the fixed sensor 56 and the movable sensor 58, in which a pair of side surfaces 76 are formed so that the distance therebetween increases toward the inside of the accommodation hole 54.
The side surface 76 of the insertion member 78 is brought into sliding contact with the side surface 74 of the movable sensor 58 on the fixed sensor 56 side. A cylindrical hole 80 is provided in the bottom portion of the insertion member 78, and one end of a spring 82 is inserted into the hole 80, and the other end of the spring 82 is a wall of the housing 29 opposite to the accommodation hole 54. The movable sensor 58 is urged in the pressing direction because it is fitted with the columnar projection 84 provided on the.

One end of the lead wire 86 is provided with the fixed sensor 56 or the movable sensor 58, and the pressure detecting element 70 is provided.
, And the other end is connected to one end of the flexible cable 88. Since the other end of the flexible cable 88 is connected to the lead wire 92 accommodated in the cord 90 inside the support member 20, the pulse wave signal detected by the pressure detection element 70 is the lead wire 7.
4, via the flexible cable 88 and the lead wire 92, it is supplied to the mounting position determination device 110 described later.

Further, the two axles 9 are provided on the outer edge of the back side member 31 of the housing 29 which is in contact with the support member 20.
4 is provided, and the wheel 96 is fitted into the axle 94, so that a gap is formed between the carotid artery wave sensor 14 and the support member 20, and the pressing direction between the carotid artery wave sensor 14 and the support member 20 is provided. The friction resistance of has been reduced.

The base end portion of the support member 20 and the one end portion of the connecting member 24 are circles provided at the base end portion of the back side member 28 in the holes 97 provided in the one end portion of the connecting member 24. By fitting the columnar protrusions 98, the columnar protrusions 98 are rotatably connected to each other around the columnar protrusions 98.

The support spring 20 provided in the space between the hole 97 and the cylindrical protrusion 98 causes the support member 20 and the connecting member 24 to approach each other, close them, or support the member 20. And contact member 22
Are urged in the radial direction of the circle formed by the mutually curved shapes.

FIG. 5 is a block diagram illustrating an essential part of the electrical configuration of the mounting position determination device 110 connected to the carotid artery wave detection device 10. In the figure, the fixed sensor 5
The pulse wave signal SM1 output from S6 and the pulse wave signals SMa and SMb output from the two movable sensors 58 are A
It is supplied to the arithmetic control circuit 114 via the / D converter 112.

The electrocardiographic induction device 116 is used as a contraction signal detecting device for detecting a signal generated when the heart of the living body contracts, and it is provided with a plurality of electrodes 118 attached to a predetermined part of the living body. , Q that occurs when myocardium contracts
Electrocardiographically induced waves including waves, R waves, S waves, and so-called electrocardiograms are continuously detected, and a signal SE indicating the electrocardiographically induced waves is supplied to the arithmetic and control circuit 114.

The arithmetic control circuit 114 includes a CPU 120, R
OM122, RAM124, output interface 12
A so-called microcomputer including 6 and the like,
The PU 120 uses the storage function of the RAM 124 while R
According to a program stored in advance in the OM 122, a reading period for reading the pulse wave signals SM1, SMa, SMb from the carotid artery wave detection device 10 is determined based on the electrocardiographic signal SE, and the pulse wave signal read in the reading period is determined. SM
By processing 1, SMa, SMb, the suitability of the mounting position of the carotid artery wave detection device 10 is determined, and the mounting position is displayed on the display device 128.

FIG. 6 is a functional block diagram for explaining a main part of the control function of the arithmetic control circuit 114 in the mounting position determination device 110. In FIG. 6, the reading period determining means 130 changes the reading period for reading the pressure pulse wave detected by the fixed sensor 56 and the movable sensor 58 into the Q wave, the R wave, and the S wave of the electrocardiographic induction waveform indicating the start of contraction of the heart. Make a decision based on For example, the reading period determination means 13
As shown in FIG. 2, 0 is determined as the reading period from the detection of the R wave of the electrocardiographic induction waveform to the elapse of half the heartbeat cycle RR.

The low frequency component removing means 131 is the ROM 12
In accordance with a program stored in No. 2 for removing a predetermined low-frequency component (for example, 0.5 Hz or less) sufficiently containing the respiratory frequency, the fixed sensor 56 and the movable sensor 58 perform the reading period determined by the reading period determining unit 130. The low frequency component is removed from the detected pressure pulse wave.

The amplitude determining means 132 is detected by the fixed sensor 56 during the reading period determined by the reading period determining means 130, and the low frequency component removing means 1 is detected.
The amplitude A of the pressure pulse wave M1 from which the low frequency component is removed by 31
1 and movable sensors 58a and 58b,
In addition, the amplitudes Aa and Ab of the pressure pulse waves Ma and Mb from which the low frequency components have been removed by the low frequency component removing means 131 are determined.
That is, during the reading period, the minimum value M1 _min and the maximum value M1 _max of the pressure pulse wave M1 in which the predetermined low frequency component is removed from the pulse wave signal SM1 supplied from the fixed sensor 56 are determined, and The difference (M1 _max −M1 _min ) is determined as the amplitude A1, and during the reading period,
Pulse wave signal SM supplied from movable sensors 58a and 58b
The minimum values Ma _min , Mb _min and the maximum values Ma _max , Mb _max of the pressure pulse waves Ma, Mb from which the predetermined low frequency components have been removed from a, SMb are determined, and the difference (Ma _max −Ma) is determined.
_{mi n,} Mb _max -Mb _min) the amplitude Aa, determined to Ab.

The positive / negative determination means 134 determines whether the pressure pulse wave M1 detected by the fixed sensor 56 has a positive waveform or an inverted waveform, and the two movable sensors 5
It is determined whether the pressure pulse wave Ma, Mb detected by 8a, 8b is a positive waveform or an inverted waveform. That is, the positive / negative determining means 134 determines which of the minimum value M1 _min and the maximum value M1 _max of the pressure pulse wave M1 detected by the fixed sensor 56 is detected first during the reading period, and the minimum When the value M1 _min is detected first, it is determined that the pressure pulse wave M1 is a positive waveform, and conversely, when the maximum value M1 _max is detected first, the pressure pulse wave M1 is an inverted waveform. To determine. Further, the pressure pulse wave Ma detected by the two movable sensors 58a, 58b,
Similarly, the mb, the minimum value Ma _min, Mb _min is determined and when that is detected earlier than the maximum value Ma _max, Mb _max is a positive waveform, conversely, the maximum value Ma _max, M
b _max is to determined to be inverted waveform when it is detected earlier than the minimum value Ma _min, Mb _min.

The mounting position display means 136 displays the amplitudes A1, Aa and Ab determined by the amplitude determination means 132 on the display 128, and whether the pressure pulse wave M1 detected by the fixed sensor 56 is a positive waveform. The display 128 displays whether the waveform is an inverted waveform. When the mounting position of the carotid artery wave detection device 10 is appropriate, that is, three sensors (a fixed sensor 56 and a movable sensor 58) provided in the carotid artery wave detection device 10 are provided.
a, 58b), the fixed sensor 56 has the most carotid artery 146.
, The pressure pulse wave M detected by the fixed sensor 56
Since the amplitude A1 of 1 is the largest and the pressure pulse wave M1 thereof has a positive waveform, the content displayed on the display 128 by the mounting position display means 136 indicates whether the mounting position of the carotid artery wave detection device 10 is appropriate or not. Can be determined.

For example, as shown in FIG. 7, the mounting position display means 136 is a two-dimensional graph 142 composed of a sensor position axis 138 showing the relative positional relationship between the pressure sensors 56 and 58 and an amplitude axis 140. The amplitude determining means 13
The amplitudes A1, Aa, and Ab determined by 2 are displayed in a bar graph format, and by distinguishing the display color or the pattern of the bar graph, it is possible to discriminate between the inverted waveform and the positive waveform. In the two-dimensional graph 142 of FIG. 7, the “left”, “center”, and “right” displayed on the sensor position axis 138 are the pressure sensors 56, 58.
Of the movable sensor 58.
a, a fixed sensor 56, and a movable sensor 58b. Also, the "left" and "center" with diagonal lines indicate that the waveform is a positive waveform. Two-dimensional graph 1 displayed on the display 128 by the mounting position display means 136
When 42 has the largest "left" amplitude as shown in FIG. 7, it can be determined that the mounting position of the carotid artery wave detection device 10 is not appropriate.

The mounting position determining means 144 compares the amplitudes A1, Aa and Ab determined by the amplitude determining means 132 with each other, and the pressure pulse wave M1 detected by the fixed sensor 56 is compared with the normality determining means 134. The suitability of the mounting position of the carotid artery wave detection device 10 is determined based on which of the positive waveform and the inverted waveform is determined in.

The mounting position of the carotid artery wave detection device 10 is determined based on the mutual comparison of the amplitudes A1, Aa, and Ab of the pressure pulse waves and whether the pressure pulse wave M1 has a positive waveform or an inverted waveform. The reason for this is as described above.
It will be described more specifically based on. 8 to 10, (a) is a diagram showing a mounting position of the carotid artery wave detecting device 10, and (b) is a diagram showing the mounting position display means 136 displaying the indicator 128 on each case. It is a figure which shows the dimension graph 142.

FIG. 8A is a diagram showing a case where the fixed sensor 56 is located right above the carotid artery 146, that is, a case where the carotid artery wave detection device 10 is properly mounted. . If the mounting position is as shown in FIG. 8 (a),
As shown in FIG. 8B, the amplitude A1 of the pressure pulse wave M1 detected by the fixed sensor 56 is the largest, and the pressure pulse wave M1 has a positive waveform.

FIG. 9 (a) is a diagram showing a case where the movable sensor 58a is located right above the carotid artery 146, that is, the case where the carotid artery wave detection device 10 is mounted at an inappropriate position. . When the mounting position is in the state of FIG. 9A, since the movable sensor 58a is closest to the carotid artery 146, as shown in FIG. 9B, the pressure pulse wave Ma detected by the movable sensor 58a. Has the largest amplitude Aa.

FIG. 10 (a) is also a diagram showing a case where the carotid artery wave detection device 10 is not properly mounted, in which the carotid wave detection device 10 is largely deviated from the proper position and is located directly above the carotid artery 146. FIG. 6 is a diagram showing a case where neither sensor is located. When the mounting position is in the state of FIG. 10A, the fixed sensor 5 is fixed as shown in FIG. 10B even though the sensor closest to the carotid artery 146 is the movable sensor 58a.
The amplitude A1 of the pressure pulse wave M1 detected by 6 becomes the largest. This is because when both sensors are relatively far from the carotid artery 146, as shown in FIG.
The magnitude of the pressure pulse wave transmitted to the movable sensor 58a, which is the sensor closest to the sensor 46, and the fixed sensor 5 located next to the pressure pulse wave.
It is considered that the difference with the magnitude of the pressure pulse wave transmitted to 6 is not so large, and since the fixed sensor 56 is fixed to the housing 29, it is easy to detect the pressure pulse wave greatly, and as a result, it is fixed. It is considered that the amplitude A1 of the pressure pulse wave M1 detected by the sensor 56 becomes the largest. Therefore, if the mounting position is determined only by comparing the magnitudes of the amplitudes A, an incorrect determination may be made.

However, when the amplitude A1 of the pressure pulse wave M1 detected by the fixed sensor 56 is maximized despite the improper mounting position, the pressure pulse wave M1 has an inverted waveform. Therefore, even if the amplitude A1 of the pressure pulse wave M1 detected by the fixed sensor 56 is the largest, it is possible to determine that the mounting position is inappropriate when the waveform is an inverted waveform. Although the reason why the waveform becomes an inverted waveform is not clear, in the case of the mounting position where no sensor is located right above the carotid artery 146, the pulsation of the carotid artery 146 causes the swing coupling device 16 to grasp the waveform. It is believed that this is due to the carotid wave sensor 14 connected to the device 12 being swung relatively large.

The moving direction determining means 148 detects the pressure pulse wave Aa detected by the movable sensors 58a and 58b when the mounting position determining means 144 determines that the mounting position of the carotid artery wave detecting device 10 is inappropriate. And Ab are compared with each other to determine a moving direction for mounting the carotid artery wave detection device 10 at an appropriate position. When the position of the carotid artery wave detection device 10 is inappropriate, the movable sensors 58a and 58a
Comparing the pressure pulse waves Aa and Ab detected by 8b, the amplitude A of the pressure pulse wave M detected by the movable sensor 58 located on the side closer to the carotid artery 146 becomes larger.
Therefore, the direction in which the fixed sensor 56 moves to the movable sensor 58 side where the amplitude A is detected largely is determined as the moving direction.

When the mounting position determining means 144 determines that the mounting position of the carotid artery wave detecting device 10 is appropriate, the determination result displaying means 150 is, for example, as shown in FIG.
As also shown, a character or a symbol indicating that the mounting position is appropriate is displayed on the display device 128.

When the moving direction of the carotid artery wave detecting device 10 is determined by the moving direction determining means 148, the moving direction display means 152, for example, is shown in FIGS.
As shown in (b), an arrow or a character indicating the moving direction is displayed on the display 128.

FIG. 11 is a flow chart for explaining a main part of control operation in the arithmetic control circuit 114 of the mounting position determination device 110. In FIG. 11, in step S1 (hereinafter, the step is omitted), the electrocardiographic induction device 116.
It is determined whether or not the R wave of the electrocardiographic induction waveform is detected based on the electrocardiographic induction signal SE sequentially supplied from the.

If the determination at S1 is negative, the determination at S1 is repeated, but if the determination at S1 is affirmative, then at S2, the R wave is detected in the previous routine and then the R wave is detected in the current routine. Based on the period until the wave is detected, that is, the heartbeat period RR, the heartbeat period RR
Is calculated.

In subsequent S3, the pressure sensors 56 and 58 are provided.
The pulse wave signals SM1, SMa, SMb from a, 58b are read, and in S4 corresponding to the subsequent low frequency component removing means 131, the read pulse wave signals SM1, S
From Ma and SMb, below a predetermined frequency (for example, 0.5
Low frequency components (Hz and below) are sequentially removed.

In the subsequent S5, it is determined whether or not the elapsed time after the R wave of the electrocardiographically induced waveform is detected in S1 has passed the half cycle of the heartbeat cycle RR calculated in S2. When this determination is negative, the reading of the pulse wave signals SM1, SMa, SMb from the pressure sensors 56, 58 is continued by executing the steps from S3 onward.

On the other hand, if the determination in S5 is affirmative,
Next, S6 to S7 corresponding to the amplitude determining means 132.
Is executed. First, in S6, the above steps S3 to S5 are repeated.
By the return, it is read during the half cycle of the heartbeat cycle RR.
In addition, the pressure pulse waves M1 and M from which the predetermined low frequency component is removed
Maximum values M1 of a and Mb_max, Ma
_max, Mb_maxAnd the minimum value M1_min, Ma_min, Mb
_minIs determined. Then, in the following S7, the maximum value
And the minimum value, that is, the amplitudes A1, Aa, and Ab are calculated.
Be done.

In S8 corresponding to the subsequent positive / negative determining means 134, the maximum value M1 _max and the minimum value M1 _min of the pressure pulse wave M1 from the fixed sensor 56 and the pressure pulse wave Ma from the movable sensor 58a determined in S6 are determined. Of the maximum value Ma _max and the minimum value Ma _min , and the maximum value Mb _max and the minimum value Mb _min of the pressure pulse wave Mb from the movable sensor 58b are determined first, and the minimum value is detected first. If so, the waveform is determined to be a positive waveform, and if the maximum value is detected first, the waveform is determined to be an inverted waveform.

At S9, the two-dimensional graph 142 displayed on the display 128 is updated at S11, which will be described later in the previous routine, based on the number of times the R wave of the electrocardiographically induced waveform is detected at S1. , It is determined whether or not a predetermined number of beats (for example, 5 beats) has elapsed. If this determination is denied, the above S1 and subsequent steps are repeated, so that the heartbeat cycle R is detected after the R wave of the electrocardiographically induced waveform is detected.
Amplitude A of each pressure pulse wave M1, Ma, Mb for each half cycle of R
1, Aa, Ab are determined.

However, if the determination in S9 is affirmative, in subsequent S10, the amplitudes A of the predetermined number of beats are obtained.
Average values A1 _AV , Aa _AV , and Ab _{AV of} 1, Aa, and Ab are calculated, respectively. Then, the subsequent mounting position display means 136
In S11 corresponding to, the average value A1 _AV , Aa _AV , Ab _AV of each amplitude calculated in S10 is represented by the height of the bar graph, and detected by the fixed sensor 56 and the movable sensors 58a and 58b determined in S8. Pressure pulse wave M1,
The contents of the two-dimensional graph 142, which indicates whether Ma and Mb have a positive waveform or an inverted waveform by the color or pattern of the bar graph, are updated.

Then, in S12 corresponding to the subsequent mounting position determining means 144, each amplitude A calculated in S10 is calculated.
1, Aa, Ab comparison with each other and fixed sensor 56
6 based on whether the pressure pulse wave M1 detected by S1 is determined to be a positive waveform or an inverted waveform in S8.
As described in detail in the description of the mounting position determining means 144, whether or not the mounting position of the carotid artery wave detecting device 10 is appropriate is determined.

If the determination at S12 is positive,
In S13 corresponding to the determination result display unit 150 that follows, for example, as shown in FIG. 8B, a character indicating that the mounting position is appropriate is displayed.

On the other hand, if the determination in S12 is negative, the pressure pulse wave Ma detected by the movable sensor 58a in S14 corresponding to the subsequent movement direction determining means 148.
Is compared with the amplitude Mb of the pressure pulse wave Mb detected by the movable sensor 58b, the direction in which the fixed sensor 56 moves to the movable sensor 58 side that detects a large amplitude is determined as the moving direction, and the following. In S15 corresponding to the movement direction display means 152, for example, as shown in FIG. 9B or 10B, an arrow indicating the movement direction determined in S14 is displayed.

As described above, according to the present embodiment, the fixed sensor 56 is controlled by the amplitude determining means 132 (S6 to S7).
Amplitude A1 of the pressure pulse wave M1 detected by the two movable sensors 58a and 5a located on both sides of the fixed sensor 56.
Amplitudes Aa, A of pressure pulse waves Ma, Mb detected by 8b
b and b are respectively determined, and the regularity determination means 134 (S8)
When it is determined whether the pressure pulse wave M1 detected by the fixed sensor 56 is a positive waveform or an inverted waveform, the mounting position display means 136 (S11) causes the amplitude determination means 132 (S6 to S7) to determine. Each of the determined amplitudes A1, Aa, and Ab is represented by the size of the bar graph, and whether the pressure pulse wave M1 detected by the fixed sensor 56 is a positive waveform or an inverted waveform is represented by the color or pattern of the bar graph. The dimensional graph 142 is the display 128.
Is displayed, it is possible to accurately determine from the two-dimensional graph 142 whether or not the mounting position of the carotid artery wave detection device 10 is appropriate.

Further, according to the present embodiment, the amplitude A1 of the pressure pulse wave M1 detected by the fixed sensor 56 by the mounting position determining means 144 (S12) is two movable sensors 5.
8a, 58b is greater than the amplitudes Aa, Ab of the pressure pulse waves Ma, Mb, and the carotid artery wave is detected based on whether or not the pressure pulse wave M1 detected by the fixed sensor 56 is a positive waveform. Since the suitability of the device 10 is determined, it is accurately determined whether the mounting position of the carotid artery wave detection device 10 is appropriate.

Further, according to this embodiment, when it is determined that the mounting position of the carotid artery wave detecting device 10 is inappropriate, the moving direction determining means 148 (S14) further detects the carotid artery wave. The moving direction for mounting the device 10 at the optimum mounting position is determined, and the moving direction display means 152
Since the moving direction is displayed by (S15), the carotid artery wave detection device 10 can be easily mounted at the optimum mounting position.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be applied to other modes.

For example, in the above-mentioned embodiment, the electrocardiographic induction device 116 is provided as a contraction signal detection device for determining the reading period, and the Q-wave, R-wave, and S-wave of the electrocardiographic induction waveform are set as the starting points of the reading period. Although a wave is illustrated, a heart sound microphone may be provided instead of the electrocardiographic induction device 116, and the I-th sound of the heart sound detected by the heart sound microphone may be used as the starting point of the reading period.

In the above-described embodiment, the carotid artery wave detecting device 10 for detecting the carotid artery wave is used as the pressure pulse wave detecting device, but the pressure pulse wave detecting device detects the carotid artery wave. It is not limited to the device. For example, it may be a radial artery detection device or a foot dorsal artery detection device.

Further, in the above-described embodiment, the carotid artery wave detecting apparatus 10 is constructed by the two-dimensional graph 142 displaying the bar graph.
However, the two-dimensional graph 142 may be a line graph. Or each amplitude A
May be displayed by a numerical value, and either a positive waveform or an inverted waveform may be displayed by characters or symbols.

Further, in the above-described embodiment, the two movable sensors 58 are provided so as to be positioned one on each side of the fixed sensor 56, but three or more movable sensors 58 may be provided. .

Further, the positive / negative determination means 134 of the above-mentioned embodiment.
In (S8), in addition to whether the pressure pulse wave M1 detected by the fixed sensor 56 is a positive waveform or an inverted waveform, the pressure pulse waves Ma and Mb detected by the movable sensor 58 are also positive waveforms. Or the inverted waveform, the mounting position display means 136 (S11) determines the three pressure pulse waves M.
Although the positive waveform or the reverse waveform is displayed for 1, Ma, and Mb, if the pressure pulse wave M1 detected by the fixed sensor 56 is the positive waveform or the reverse waveform, it is displayed. Since the suitability of the mounting position can be determined, the pressure pulse wave M
It is not necessary to determine whether a and Mb have a positive waveform or an inverted waveform.

The present invention can be modified in various other ways without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a front view of a carotid artery wave detection device to which a mounting position determination device of the present invention can be applied.

FIG. 2 is a diagram illustrating an example of a pressure pulse wave detected by a fixed sensor and a movable sensor included in the carotid artery wave detection device of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a view in which a support member and a front side member of a housing are removed from the carotid artery wave detection device of FIG. 1 and a part is cut away.

5 is a block diagram illustrating a main part of an electrical configuration of a mounting position determination device connected to the carotid artery wave detection device of FIG. 1. FIG.

FIG. 6 is a functional block diagram illustrating a main part of a control function of an arithmetic control circuit in the mounting position determination device in FIG.

7 is a diagram showing an example of a two-dimensional graph displayed by the mounting position display means of FIG.

8A is a diagram showing a case where the carotid artery wave detection device of FIG. 1 is mounted in an appropriate position, and FIG. 8B is a diagram showing a two-dimensional graph displayed by the mounting position display means at that time. Is.

9A is a diagram showing a case where the mounting position of the carotid artery wave detection device of FIG. 1 is inappropriate, and FIG. 9B is a diagram showing a two-dimensional graph displayed by the mounting position display means at that time. is there.

10 (a) is a diagram showing a mounting position different from that in FIG. 9 (a) when the mounting position of the carotid artery wave detection device in FIG. 1 is inappropriate, and (b) at that time. It is a figure which shows the two-dimensional graph displayed by the mounting position display means.

11 is a flowchart illustrating a main part of control operation in the arithmetic control circuit of the mounting position determination device in FIG.

[Explanation of symbols]

10: Carotid artery wave detector (pressure pulse wave detector) 110: Mounting position determination device 132: Amplitude determining means 134: Means for determining right / counterfeit 136: Mounting position display means 144: Mounting position determination means

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A61B 5/0245

Claims (2)

(57) [Claims] 1. A housing having an accommodating hole whose opening is opened in the shape of an elongated hole, a fixed sensor for pressing an artery of a living body in a state of being fixed in the accommodating hole of the housing, and positions on both sides of the fixed sensor. As described above, the at least two movable sensors, which are housed in the housing hole of the housing and are movable in the pressing direction of the fixed sensor by being biased in the pressing direction of the fixed sensor, A gripping device that is curved in one plane for gripping a predetermined portion, and an elongated hole-shaped opening of a housing hole of the housing is in a direction crossing the artery, and the housing is the one plane. A mounting position determining device for determining a mounting position of a pressure pulse wave detecting device including a swing connecting device that connects the housing to one end of the gripping device so that the housing can swing about a swing center axis perpendicular to Ah Amplitude determining means for respectively determining the amplitude of the pressure pulse wave detected by the fixed sensor and the amplitude of the pressure pulse wave detected by the at least two movable sensors, and the pressure pulse detected by the fixed sensor. A positive / negative determination means for determining whether the wave is a positive waveform or an inverted waveform, displaying the respective amplitudes determined by the amplitude determination means, and the pressure pulse wave detected by the fixed sensor is A mounting position determining device for a pressure pulse wave detecting device, comprising: mounting position display means for displaying which of a positive waveform and an inverted waveform is determined by the positive and negative determining means. 2. A housing having an accommodating hole whose opening is opened in the shape of an elongated hole, a fixed sensor for pressing an artery of a living body in a state of being fixed in the accommodating hole of the housing, and positions on both sides of the fixed sensor. As described above, the at least two movable sensors, which are housed in the housing hole of the housing and are movable in the pressing direction of the fixed sensor by being biased in the pressing direction of the fixed sensor, A gripping device that is curved in one plane for gripping a predetermined portion, and an elongated hole-shaped opening of a housing hole of the housing is in a direction crossing the artery, and the housing is the one plane. A mounting position determining device for determining a mounting position of a pressure pulse wave detecting device including a swing connecting device that connects the housing to one end of the gripping device so that the housing can swing about a swing center axis perpendicular to Ah The amplitude of the pressure pulse wave detected by the fixed sensor is larger than the amplitude of the pressure pulse wave detected by the at least two movable sensors, and the pressure pulse wave detected by the fixed sensor is a positive waveform. The mounting position determining device for the pressure pulse wave detecting device further comprises a mounting position determining means for determining whether the mounting position of the pressure pulse wave detecting device is proper or not.