JP2001190508A - Installing position judging device of pressure pulse wave detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installing position judging device capable of accurately judging whether or not an installing position of a pressure pulse wave detecting device is proper in the pressure pulse wave detecting device having movable sensors movable in the pressing direction on both sides of a fixed sensor. SOLUTION: When it is judged whether a pressure pulse wave M1 detected by a fixed sensor 56 is either of a normal waveform or a reverse waveform by a normalcy-reversal deciding means 134 (S8), respective amplitudes A1, Aa, Ab decided by an amplitude deciding means 132 (S6 to S7) are expressed in the size of a bar graph by an installing position display means 136 (S11), and since a two-dimensional graph 142 for expressing whether the pressure pulse wave M1 detected by the fixed sensor 56 is either of a normal waveform or a reverse waveform by a color or a pattern of the bar graph is displayed on a diaplay 128, whether or not the installing position of a carotid wave detecting device 10 is proper can be accurately judged from the two-dimensional graph 142.

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 an artery is pressed from above the body surface by a pressure sensor having a pressing surface, and a pressure pulse wave is detected by the pressure sensor.

When a pressure pulse wave from an artery is detected by the pressure pulse wave detection device, the pressure pulse wave detection device is mounted at an appropriate mounting position so that the pressure sensor can detect the pressure pulse wave from the artery. Although it is necessary, since the artery exists under the epidermis, it is difficult to determine whether the mounting position of the pressure pulse wave detecting device is appropriate. In addition, since the body surface has a complicated uneven shape, the mounting position often shifts due to body movement or the like even if the body surface is once mounted at an appropriate position.

Accordingly, the present applicant has invented a pressure pulse wave detecting device which does not have the above-mentioned problems, and has previously applied for a device in which the device is applied to a carotid artery wave detecting device. This is the carotid artery wave detecting device described in Japanese Patent Application No. 10-233843. FIG. 1 is a front view showing a carotid artery wave detection device 10 disclosed as an embodiment in the specification of the above application. When the carotid artery wave detection device 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 urged in the pressing direction of the fixed sensor 56, the two movable sensors 58 also press the neck of the living body. Stabilize. In addition, the carotid artery wave detection device 1
The mounting position of “0” corresponds to the vibration component AC1 of the pulse wave detected by the fixed sensor 56 in an 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 with each other, and the carotid artery wave detection device is set so that the vibration component AC1 of the pulse wave detected by the fixed sensor 56 is larger than the vibration components ACa and ACb of the pulse wave detected by the movable sensor 58. Since the ten mounting positions are determined, the fixed sensor 56 can be accurately positioned above the carotid artery.

[0005]

In the pressure pulse wave detecting device as exemplified in FIG. 1, 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. If the mounting position of the pressure pulse wave detection device is determined as described above, in most cases, it is possible to mount the pressure pulse wave detection device at an appropriate mounting position. 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 to provide a pressure sensor having movable sensors movable in the pressing direction on both sides of a fixed sensor as described above. It is an object of the present invention to provide a mounting position determining device that can accurately determine whether a mounting position of a pressure pulse wave detecting device is appropriate in a pulse wave detecting device.

[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 there is an inverted waveform. That is,
As shown in FIG. 2, assuming that a time point at which a signal generated during contraction of the heart (in FIG. 2, an R wave of an electrocardiographic waveform) is detected is a reference point (start point), the minimum value min in one pulse wave is Maximum value max
It has been found that there is a positive waveform detected earlier than the normal waveform, and conversely, an inverted waveform where the maximum value max in one pulse wave is detected earlier than the minimum value min. Although the reason for the inversion of the pressure pulse wave is not clear, the fixed sensor is used when the mounting position of the pressure pulse wave detection device is inappropriate and the swing connection device is swung by the pulsation of the artery during measurement. We have found that the detected waveform is an inverted waveform. The present invention has been made based on such findings.

[0008]

SUMMARY OF THE INVENTION That is, the gist of the first invention for achieving the above object is to provide a housing provided with a receiving hole whose opening is formed in a long hole shape, and a housing having the same. A fixed sensor that presses an artery of a living body while 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 urged in the pressing direction of the fixed sensor. Thereby, at least two movable sensors movable in the pressing direction of the fixed sensor, a gripping device curved in one plane for gripping a predetermined portion of the living body, and a length of the housing hole of the housing The housing is moved so that the hole-shaped opening extends 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 comprising a swing connection device connected to the end, a mounting position determination device that determines 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) determining whether the pressure pulse wave detected by the fixed sensor is a positive waveform or an inverted waveform. Positive / reverse determining means for determining, and (c) displaying respective amplitudes determined by the amplitude determining means, and a pressure pulse wave detected by the fixed sensor is a positive waveform and an inverted waveform by the positive / reverse determining means. And mounting position display means for displaying which of the two is determined.

[0009]

According to this structure, the amplitude determining means determines 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. When the amplitude of the pressure pulse wave detected by the fixed sensor is determined to be a positive waveform or an inverted waveform, the mounting position display means determines the amplitude of the pressure pulse wave. Is displayed, and whether the pressure pulse wave detected by the fixed sensor is a positive waveform or an inverted waveform is displayed. If the pressure pulse wave detection device is properly mounted, the amplitude of the pressure pulse wave detected by the fixed sensor is the largest and the pressure pulse wave has a positive waveform. It is possible to accurately determine whether the mounting position of the pulse wave detection device is appropriate.

[0010]

According to a second aspect of the present invention, there is provided a housing provided with a receiving hole having an elongated opening, and a housing for the housing. A fixed sensor for pressing an artery of a living body in a state of being fixed to the hole, and being housed in the housing hole of the housing so as to be located on both sides of the fixed sensor, and being urged in the pressing direction of the fixed sensor. Accordingly, at least two movable sensors movable in the pressing direction of the fixed sensor, a gripping device that is curved in one plane to grip a predetermined portion of the living body, and a long hole of the housing hole of the housing The housing is attached to one end of the gripping device so that the opening in the shape of a cross extends in the 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 the pressure pulse wave detecting device having a swing connection device for coupling, wherein an amplitude of the pressure pulse wave detected by the fixed sensor is equal to the at least two movable sensors. Is larger 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,
A mounting position determining unit that determines whether the mounting position of the pressure pulse wave detecting device is appropriate is included.

[0011]

With this arrangement, the amplitude of the pressure pulse wave detected by the fixed sensor by the mounting position determining means is made larger 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 based on whether the pressure pulse wave detected by the fixed sensor is large or not, the mounting position of the pressure pulse wave detection device is appropriate. Is accurately determined.

[0012]

In another aspect of the present invention, preferably, the mounting position display means includes a two-dimensional graph constituted by a sensor position axis and an amplitude axis representing the mutual position between the sensors, the amplitude determining means Graphically display the determined amplitudes, and graphically display the amplitudes 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. Is what you do.

[0013] Preferably, the mounting position determining apparatus according to the second invention, when the mounting position determining means determines that the mounting position of the pressure pulse wave detecting apparatus is inappropriate,
By comparing the amplitudes of the pressure pulse waves detected by the at least two movable sensors, the moving direction for mounting the pressure pulse wave detection device at the optimum mounting position is determined by the fixed sensor having the largest amplitude. And a moving direction determining means for determining a moving direction toward the movable sensor side for detecting a pressure pulse wave having a large pressure pulse wave.

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

[0015]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the present embodiment, a case where the carotid artery wave detection device 10 is used as a pressure pulse wave detection device will be described. Therefore, the carotid wave detection device 10 will be described first.

As shown in FIG. 1, the carotid artery wave detection device 10 is curved as a whole in one plane to grip the neck of a living body, and is urged in a diameter reducing direction by an elastic restoring force. A device 12, a carotid artery wave sensor 14 mounted on one end of the device 12, and the carotid artery wave sensor 14 is positioned inside the grasping device 12 in one plane with respect to one end of the grasping device 12; A swing connection device 16 that swingably connects the gripping device 12 and the carotid artery wave sensor 14 to each other so as to swing around a swing center axis C perpendicular to one 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 formed by bending from synthetic resin to be elastically deformed. A possible contact member 22, one end of which is fixed to the base end of the contact member 22, and the other end
A relatively rigid connection member 24 is connected to the support member 20 and the contact member 22 so as to be rotatable by being rotatably connected to the base end of the support member 20.

The support member 20 is provided with a carotid artery wave sensor 14.
As shown in FIG. 3, which is a cross-sectional view taken along the line AA in FIG. 1, the front side member 26 and the back side member 28 divided by a plane parallel to the one plane are connected to each other. It is constituted by being combined and fixed. Note that the housing 29 of the carotid artery wave sensor 14 also
The front side member 30 and the back side member 31 divided by a plane parallel to the 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 at predetermined intervals in the width direction thereof and provided with arc-shaped guide holes 33, respectively.
Are provided so as to protrude inward, and a pair of engagement protrusions 35 respectively protruding from the side surface of the housing 29 of the carotid artery wave sensor 14 are housed in the guide holes 33 and engage with the inner wall surface. As a result, the carotid artery wave sensor 14 is prevented from falling off from 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
3 guides the engagement protrusion 35,
The carotid artery wave sensor 14 is swingably connected to one end of the support member 20 around a swing center axis C. Therefore, the support bracket 34 in which the guide hole 33 is formed and the engagement protrusion 35 constitute the swing connection device 16.

FIG. 4 shows a state in which 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 are removed in order to explain the configuration of the carotid artery wave detection device 10 in detail. The carotid artery wave detection device 1
It is a figure which cuts out some 0 and is shown.

In the carotid artery wave sensor 14, the back member 31 of the housing 29 and the front member 30 not shown in FIG. 4 have a flat and substantially elliptical shape, and are provided with screw holes provided in the cylindrical projection 50 of the back member 31. 52, the screw 32 is screwed through 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 a housing 29 having a receiving hole 54 that opens in a long hole shape.

In the receiving hole 54, a fixed sensor 56,
Two movable sensors 58a and 58b (hereinafter, simply referred to as a movable sensor 58 unless otherwise specified) are accommodated in parallel. As shown in FIG. 3, the fixed sensor 56 is fixed to the housing 29 by a pin 60 functioning as a fixed shaft, and 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 opposite to the fixed sensor 56 side engage with the substantially radial guide grooves 66 provided in the housing 29, so that the guide grooves 66 are formed. Are movably held along the housing 29.

The swing center axis C is located substantially on the center line of the fixed sensor 56 and near the center of its pressing surface 68 so as to be located substantially at the center of the carotid artery when worn. The fixed sensor 56 includes a pressing surface 68 pressed toward the carotid artery, a pressure detecting element 70 for detecting a pressure from the pressing surface 68, and a pair of members whose distance from each other decreases as the distance from the pressing surface 68 increases. And is housed in the housing hole 54 with the end on the pressing surface 68 side 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 provided with the ridge 64 that engages with the guide groove 66. The side surface 74 is configured such that the farther away from the pressing surface 68, the smaller the distance to the opposite side surface 62. In addition, 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 a length (for example, 15 mm) larger than the diameter of the carotid artery. ing.

An interposition member 78 is formed between the fixed sensor 56 and the movable sensor 58. The insertion member 78 has a pair of side surfaces 76 whose mutual distance increases toward the inside of the accommodation hole 54.
Is inserted, and 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 at the bottom 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 connected to a wall of the housing 29 opposite to the housing hole 54. The movable sensor 58 is urged in the pressing direction since the movable sensor 58 is fitted with the cylindrical projection 84 provided on the movable sensor 58.

The lead wire 86 has one end provided to the fixed sensor 56 or the movable sensor 58.
, 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 detecting element 70 is
4. Via a flexible cable 88 and a lead wire 92, it is supplied to a mounting position determination device 110 described later.

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

The base end of the support member 20 and one end of the connecting member 24 are connected to a circle provided at the base end of the back member 28 in a hole 97 provided at one end of the connecting member 24. When the columnar projection 98 is fitted, the columnar projection 98 is rotatably connected to each other around the columnar projection 98.

Further, the supporting member 20 and the connecting member 24 are brought closer to each other, closed, or closed by the helical spring 100 provided in the space between the hole 97 and the columnar projection 98. 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 for explaining a main part of an electrical configuration of the mounting position judging device 110 connected to the carotid artery wave detecting device 10. As shown in FIG. In the figure, the fixed sensor 5
6 and the pulse wave signals SMa and SMb output from the two movable sensors 58 are A
The signal is supplied to the arithmetic control circuit 114 via the / D converter 112.

The electrocardiographic guiding device 116 is used as a contraction signal detecting device for detecting a signal generated when the heart of a living body contracts, and is provided through a plurality of electrodes 118 attached to predetermined portions of the living body. Q generated during contraction of myocardium
Electrocardiograms including waves, R waves, S waves, etc., so-called electrocardiograms, are continuously detected and a signal SE indicating the electrocardiogram is supplied to the arithmetic and control circuit 114.

The arithmetic control circuit 114 includes a CPU 120, R
OM 122, RAM 124, output interface 12
And a so-called microcomputer having a C6 and the like.
The PU 120 uses the storage function of the RAM 124 while
In accordance with 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 detecting device 10 is determined based on the electrocardiographic signal SE, and the pulse wave signal read in the reading period is determined. SM
1. By processing SMa and 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 128.

FIG. 6 is a functional block diagram for explaining a main part of the control function of the arithmetic and control circuit 114 in the mounting position judging device 110. In FIG. 6, the reading period determining unit 130 sets the reading period for reading the pressure pulse wave detected by the fixed sensor 56 and the movable sensor 58 to the Q wave, the R wave, and the S wave of the electrocardiographic lead waveform representing the start of contraction of the heart. Decide based on For example, the reading period determining means 13
0, as shown in FIG. 2, determines the read period from the detection of the R wave of the electrocardiographic lead waveform to the elapse of a half period of the heartbeat cycle RR.

The low frequency component removing means 131 is provided in the ROM 12
The fixed sensor 56 and the movable sensor 58 perform the reading period determined by the reading period determining means 130 in accordance with the program stored in 2 and which removes a predetermined low frequency component (for example, 0.5 Hz or less) sufficiently including the respiration frequency. The low frequency component is removed from the detected pressure pulse wave.

The amplitude determining means 132 detects the low-frequency component removing means 1 while being detected by the fixed sensor 56 during the reading period determined by the reading period determining means 130.
31, the amplitude A of the pressure pulse wave M1 from which the low frequency component has been removed.
1, and detected by the movable sensors 58a, 58b,
Further, 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 from which the predetermined low-frequency component has been removed are determined from the pulse wave signal SM1 supplied from the fixed sensor 56. 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, 58b
a, SMb, 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 component has been removed are determined, and the difference (Ma _max −Ma b) is determined.
_{mi n,} Mb _max -Mb _min) the amplitude Aa, determined to Ab.

The positive / reverse determining means 134 determines whether the pressure pulse wave M1 detected by the fixed sensor 56 is a normal waveform or an inverted waveform, and determines whether the pressure pulse wave M1 has the two waveforms.
It is determined whether the pressure pulse waves Ma and Mb detected by 8a and 8b are a positive waveform or an inverted waveform. That is, the positive / reverse 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 has been detected first during the reading period, If the value M1 _min is detected first, the pressure pulse wave M1 is determined to have a positive waveform. Conversely, if the maximum value M1 _max is detected first, the pressure pulse wave M1 has an inverted waveform. Is determined. In addition, the pressure pulse wave Ma detected by the two movable sensors 58a and 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, 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 has a positive waveform. The display 128 indicates 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 (fixed sensor 56 and movable sensor 58) provided in the carotid artery wave detection device 10
a, 58b), the fixed sensor 56 is the carotid artery 146 most.
, The pressure pulse wave M detected by the fixed sensor 56
1 is the largest, and the pressure pulse wave M1 has a positive waveform. Therefore, the content displayed on the display 128 by the mounting position display means 136 determines whether the mounting position of the carotid artery wave detection device 10 is appropriate. Can be determined.

For example, as shown in FIG. 7, the mounting position display means 136 includes a two-dimensional graph 142 composed of a sensor position axis 138 indicating 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 in Step 2 are displayed in the form of a bar graph, and the display color or pattern of the bar graph is distinguished, so that the inverted waveform or the positive waveform is identifiably displayed. In the two-dimensional graph 142 of FIG. 7, “left”, “center”, and “right” displayed on the sensor position axis 138 are the pressure sensors 56 and 58.
And the relative positions of the movable sensors 58
a, the fixed sensor 56 and the movable sensor 58b. The “left” and “center” with diagonal lines indicate that the waveform is a positive waveform. Two-dimensional graph 1 displayed on display 128 by mounting position display means 136
When the amplitude of “left” is the largest 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 furthermore, the pressure pulse wave M1 detected by the fixed sensor 56 is compared with the forward / backward determining means 134. It is determined whether the mounting position of the carotid artery wave detection device 10 is appropriate based on which of the positive waveform and the inverted waveform has been determined in.

The mounting position of the carotid artery wave detection device 10 is determined based on the comparison between the amplitudes A1, Aa, Ab of the respective 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.
This will be described more specifically on the basis of FIG. 8A to 10, (a) is a diagram showing a mounting position of the carotid artery wave detection device 10, and (b) is a diagram showing a case where the mounting position display means 136 displays the display position on the display 128 in each case. FIG. 4 is a diagram showing a dimension graph 142.

FIG. 8A is a diagram showing a case where the fixed sensor 56 is located immediately above the carotid artery 146, that is, a case where the mounting position of the carotid artery wave detection device 10 is appropriate. . When the mounting position is in the state of FIG.
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. 9A is a diagram showing a case where the movable sensor 58a is located immediately above the carotid artery 146, that is, a case where the mounting position of the carotid artery wave detection device 10 is inappropriate. . 9A, the movable sensor 58a is closest to the carotid artery 146, so that the pressure pulse wave Ma detected by the movable sensor 58a, as shown in FIG. 9B. Has the largest amplitude Aa.

FIG. 10A also shows a case where the mounting position of the carotid artery wave detecting device 10 is inappropriate, and the mounting position is greatly deviated from the appropriate position. FIG. 4 is a diagram showing a case where no sensor is located. When the mounting position is in the state shown in FIG. 10A, the fixed sensor 5 is located as shown in FIG. 10B, although the sensor closest to the carotid artery 146 is the movable sensor 58a.
6, the amplitude A1 of the pressure pulse wave M1 detected is the largest. This is because, as shown in FIG. 10A, when any of the sensors is relatively far from the carotid artery 146, the carotid artery 1
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 movable sensor 58a.
In addition to the fact that the difference from the magnitude of the pressure pulse wave transmitted to 6 is not so large, since the fixed sensor 56 is fixed to the housing 29, it is easy to detect a large pressure pulse wave. It is considered that the amplitude A1 of the pressure pulse wave M1 detected by the sensor 56 becomes largest. Therefore, if the mounting position is determined only by comparing the magnitude of the amplitude A, an erroneous determination may be made.

However, when the amplitude A1 of the pressure pulse wave M1 detected by the fixed sensor 56 is the largest even though the mounting position is inappropriate, 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 can be determined that the mounting position is inappropriate if the waveform is an inverted waveform. Although the reason why the waveform is an inverted waveform is not clear, in the case of a mounting position in which no sensor is located directly above the carotid artery 146, the oscillating connection device 16 grips the carotid artery 146 due to pulsation of the carotid artery 146. It is considered that the cause is that the carotid artery wave sensor 14 connected to the device 12 is relatively swung.

When the mounting position determining means 144 determines that the mounting position of the carotid artery wave detecting device 10 is inappropriate, the moving direction determining means 148 detects the pressure pulse wave Aa detected by the movable sensors 58a and 58b. By comparing Ab and Ab, the moving direction for mounting the carotid artery wave detection device 10 at an appropriate position is determined. When the mounting position of the carotid artery wave detection device 10 is inappropriate, the movable sensors 58a and 58
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 closer to the carotid artery 146 is larger.
Accordingly, the direction in which the fixed sensor 56 moves toward the movable sensor 58 that detects the large amplitude A is determined as the moving direction.

When the mounting position determining means 144 determines that the mounting position of the carotid artery wave detection device 10 is appropriate, the determination result displaying means 150 is, for example, shown in FIG.
As shown in FIG. 7, a character or a symbol indicating that the mounting position is appropriate is displayed on the display 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 displaying means 152 is, for example, 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 flowchart for explaining a main part of the control operation in the arithmetic and control circuit 114 of the mounting position determination device 110. In FIG. 11, in step S <b> 1 (hereinafter, the steps are omitted), the electrocardiographic guiding device 116 is used.
It is determined whether or not the R wave of the electrocardiographic lead waveform is detected based on the electrocardiographic lead signal SE sequentially supplied from.

When the determination in S1 is denied, the determination in S1 is repeated. When the determination is affirmative, in S2, the R wave is detected in the previous routine, and the R wave is detected in the current routine. Based on the period until the wave is detected, that is, the heartbeat cycle RR, the heartbeat cycle RR
Are calculated.

In the following S3, each of the pressure sensors 56, 58
a, 58b from the pulse wave signals SM1, SMa, SMb are read, and in S4 corresponding to the subsequent low frequency component removing means 131, the read pulse wave signals SM1, SMa
From Ma and SMb, a predetermined frequency or less (for example, 0.5
Hz).

At S5, it is determined whether or not the elapsed time since the detection of the R-wave of the electrocardiographic lead waveform at S1 has exceeded a half cycle of the heartbeat cycle RR calculated at S2. If this determination is denied, the reading of the pulse wave signals SM1, SMa, SMb from each of the pressure sensors 56, 58 is continued by executing the above S3 and subsequent steps.

On the other hand, if the judgment at S5 is affirmative,
Next, S6 to S7 corresponding to the amplitude determination means 132
Is executed. First, in S6, the above steps S3 to S5 are repeated.
By reading back, it is read during the half cycle of the heartbeat cycle RR.
And the pressure pulse waves M1 and M from which the predetermined low-frequency component has been removed.
a and Mb, the respective maximum values M1_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, Ab are calculated.
It is.

At S8 corresponding to the forward / reverse 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 are determined at S6. the maximum value Ma _max and the minimum value Ma _min, the maximum value Mb _max and the minimum value Mb _min of pressure pulse wave Mb from the movable sensor 58b of each one has either been detected earlier is determined, the minimum value is detected first If the maximum value is detected first, the waveform is determined to be an inverted waveform.

In S9, based on the number of times the R wave of the electrocardiographic lead waveform is detected in S1, the two-dimensional graph 142 displayed on the display 128 in S11 described later in the previous routine is updated. It is determined whether a predetermined number of beats (for example, 5 beats) have elapsed. If this determination is denied, the above-described S1 and subsequent steps are repeated, so that the heartbeat period R
The amplitude A of each pressure pulse wave M1, Ma, Mb for each half cycle of R
1, Aa and Ab are determined.

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

In S12 corresponding to the subsequent mounting position judging means 144, each amplitude A calculated in S10 is used.
1. Comparison between Aa and Ab, and fixed sensor 56
6 based on whether the pressure pulse wave M1 detected by the above 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, it is determined whether the mounting position of the carotid artery wave detection device 10 is appropriate.

If the determination in S12 is affirmative,
In S13 corresponding to the subsequent determination result display means 150, 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, in S14 corresponding to the moving direction determining means 148, the pressure pulse wave Ma detected by the movable sensor 58a is determined.
Is compared with the amplitude Mb of the pressure pulse wave Mb detected by the movable sensor 58b, and the direction in which the fixed sensor 56 moves to the side of the movable sensor 58 that detects a large amplitude is determined as the moving direction. In S15 corresponding to the moving direction display means 152, for example, as shown in FIG. 9B or FIG. 10B, an arrow indicating the moving direction determined in S14 is displayed.

As described above, according to this embodiment, the fixed sensor 56 is controlled by the amplitude determining means 132 (S6 to S7).
A1 of the pressure pulse wave M1 detected by the first and second movable sensors 58a, 58a,
8a, amplitudes Aa, A of pressure pulse waves Ma, Mb detected by
b are determined respectively, and the correct / reverse determination means 134 (S8)
Determines whether the pressure pulse wave M1 detected by the fixed sensor 56 is a positive waveform or an inverted waveform, by the mounting position display means 136 (S11) and the amplitude determination means 132 (S6 to S7). Each of the determined amplitudes A1, Aa, Ab is represented by the size of a bar graph, and the color or pattern of the bar graph indicates whether the pressure pulse wave M1 detected by the fixed sensor 56 is a positive waveform or an inverted waveform. The dimension graph 142 is displayed on the display 128.
Is displayed, it is possible to accurately determine from the two-dimensional graph 142 whether 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 judging means 144 (S12) is determined by the two movable sensors 5 (S12).
Carotid artery wave detection is performed based on whether the amplitudes Aa, Ab of the pressure pulse waves Ma, Mb detected by 8a, 58b are larger and 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 wave detection device 10 is appropriate.

Further, according to the present 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 movement direction is displayed by (S15), the carotid artery wave detection device 10 can be easily mounted at the optimum mounting position.

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

For example, in the above-described embodiment, the electrocardiographic lead device 116 is provided as a contraction signal detecting device for determining the reading period, and the starting points of the reading period are the Q wave, R wave, and S wave of the electrocardiographic lead waveform. Although the wave is illustrated, a heart sound microphone may be provided in place of the electrocardiographic induction device 116, and the first sound of the heart sound detected by the heart sound microphone may be used as the start point of the reading period.

Further, in the above-described embodiment, an example has been described in which the carotid artery wave detecting device 10 for detecting a carotid artery wave is used as the pressure pulse wave detecting device. It is not limited to the device which performs. For example, a radial artery detecting device or a dorsal foot artery detecting device may be used.

In the above-described embodiment, the two-dimensional graph 142 displaying a bar graph is used to display the carotid artery wave detecting device 10.
Are displayed, but the two-dimensional graph 142 may be a line graph. Alternatively, each amplitude A
May be displayed in the form of a numerical value, a positive waveform or an inverted waveform, or may be displayed in characters or symbols.

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

The correct / reverse determining means 134 of the above-described embodiment is used.
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. The mounting position display means 136 (S11) determines whether the three pressure pulse waves M
Although it has been displayed whether 1, Ma and Mb are a positive waveform or an inverted waveform, if it is displayed whether the pressure pulse wave M1 detected by the fixed sensor 56 is a positive waveform or an inverted waveform. , The suitability of the mounting position can be determined.
It is not necessary to determine whether a and Mb are positive waveforms or inverted waveforms.

The present invention can be modified in various other ways without departing from the gist thereof.

[Brief description of the 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 provided in the carotid artery wave detection device in FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

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 thereof is cut away.

FIG. 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 in FIG. 1;

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 of FIG. 5;

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 at an appropriate position, and FIG. 8B is a diagram showing a two-dimensional graph displayed by the mounting position display means at that time. It is.

9A is a diagram showing a case where the mounting position of the carotid artery wave detection device in 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.

10A shows a case where the mounting position of the carotid artery wave detection device in FIG. 1 is inappropriate, and shows a mounting position different from that in FIG. 9A, and FIG. FIG. 4 is a diagram showing a two-dimensional graph displayed by a mounting position display means.

FIG. 11 is a flowchart illustrating a main part of a control operation in an arithmetic and control circuit of the mounting position determination device in FIG. 5;

[Explanation of symbols]

 10: Carotid artery wave detecting device (pressure pulse wave detecting device) 110: Mounting position determining device 132: Amplitude determining means 134: Forward / reverse determining means 136: Mounting position displaying means 144: Mounting position determining means

Claims (2)

[Claims] 1. A housing having an accommodation hole whose opening is formed in an elongated hole shape, a fixed sensor for pressing an artery of a living body in a state of being fixed to the accommodation hole of the housing, and a fixed sensor located on both sides of the fixed sensor. And at least two movable sensors that are movable in the pressing direction of the fixed sensor by being urged in the pressing direction of the fixed sensor while being housed in the housing hole of the housing, A gripping device that is curved in one plane to grip a predetermined portion, and a slot-shaped opening of the accommodation hole of the housing is oriented in a direction crossing the artery, and the housing is positioned in the one plane. And a swing connection device that connects the housing to one end of the gripping device so as to swing about a swing center axis perpendicular to the pressure pulse wave detection device. 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. Positive / reverse determining means for determining whether the wave is a positive waveform or an inverted waveform; and displaying respective amplitudes determined by the amplitude determining means, and wherein the pressure pulse wave detected by the fixed sensor is A mounting position display unit for displaying which of a positive waveform and an inverted waveform has been determined by the positive / reverse determining unit. 2. A housing having an accommodation hole whose opening is formed in an elongated hole shape, a fixed sensor for pressing an artery of a living body fixed to the accommodation hole of the housing, and a fixed sensor located on both sides of the fixed sensor. And at least two movable sensors that are movable in the pressing direction of the fixed sensor by being urged in the pressing direction of the fixed sensor while being housed in the housing hole of the housing, A gripping device that is curved in one plane to grip a predetermined portion, and a slot-shaped opening of the accommodation hole of the housing is oriented in a direction crossing the artery, and the housing is positioned in the one plane. And a swing connection device that connects the housing to one end of the gripping device so as to swing about a swing center axis perpendicular to the pressure pulse wave detection device. 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 has a positive waveform. A mounting position determining unit for determining whether the mounting position of the pressure pulse wave detecting device is appropriate based on whether the pressure pulse wave detecting device is mounted or not.