JP2002224064A - Pressure pulse wave sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure pulse wave sensor for attaining installation stability of the sensor, preventing congestion of a vein, and inexpensively measuring a pressure pulse wave while securing sufficient sensor sensitivity. SOLUTION: This pressure pulse wave sensor 1A has an artery pressing part 2 having a body surface pressing surface 2a having the area suitable for obtaining an internal pressure waveform of an artery by pressing the artery, a flexible fixing plate 3 attached with the artery pressing part 2, a pressure detecting element 4 having a pressure sensitive part having the area larger than the body surface pressing surface 2a of the artery pressing part 2, and detecting deflection of the fixing plate 3 by being installed on the fixing plate 3, a fixing plate support part 5 for supporting the fixing plate 3, and a pressing means 6 attached with the fixing plate support part 5, and generating pressure for pressing the artery from a body surface by the artery pressing part 2. A nondeflective part (a peripheral part) in one surface of the fixing plate 3 is fitted with a flexible angle stabilizing support part 15 having an end surface 15a positioned on the same plane as the body surface pressing surface 2a of the artery pressing part 2 installed on this one surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pressure pulse wave sensor for measuring an internal pressure waveform of an artery from a body surface.

[0002]

2. Description of the Related Art Conventionally, as a pressure pulse wave sensor for measuring an internal pressure waveform (pressure pulse waveform) of an artery from a body surface, there is a pressure pulse wave sensor using the tonometry principle. Among the pressure pulse wave sensors using the tonometry principle, a pressure pulse wave sensor using a single pressure sensor (for example, a pressure pulse wave sensor manufactured by Nihon Kohden: Model TF-
601T) and a tonometry sensor formed by arranging a plurality of pressure sensors (for example, a continuous blood pressure measuring device manufactured by Nippon Corin: Model JENTOW-7700).

In the former pressure pulse wave sensor using a single sensor, a pressure-sensitive portion of the sensor is pressed vertically from the body surface to an arterial running portion, and an appropriate pressure is applied to measure the internal pressure waveform.

One of such pressure pulse wave sensors is as follows.
Some sensors hold and fix the sensor by hand. However, in this case, there is a problem that the mounting position of the sensor becomes unstable. That is, the body movement of the sensor holder affects the measurement waveform. In addition, there is a problem that it is difficult to keep the pressure of the sensor stable.

[0005] On the other hand, there is a type in which a sensor is held using a jig (for example, HDI INC. CR-2000). In this case, the stability of holding the sensor is increased, but it is difficult to adjust the angle of the sensor with respect to the artery, and a high level of technique is required.
In addition, the adjustment of pressing must be determined while observing the waveform, and the user needs advanced knowledge and skill.

Further, when applied to the radial artery of the wrist, it is necessary that the pressing portion be small. However, in a conventional small pressure pulse wave sensor, when the size is reduced, the sensor is also reduced in size (for example, 100 μm). ), The sensitivity of a small sensor decreases, and the S / N decreases. In addition, miniaturization of the sensor requires fine processing and increases the cost.

On the other hand, in the latter pressure pulse wave sensor using a plurality of pressure sensors, the sensor is held by using a fixing tool (belt), and an appropriate pressure is applied by air pressure, whereby the arterial running portion is controlled by the sensor. In some cases, the pressure-sensitive portion is pressed vertically from the body surface to measure the internal pressure waveform.

In this case, the stability of holding the sensor is increased, but the contact portion between the pressing part of the fixture and the living body completely covers the entire circumference of the living body measuring part, and as a result, the vein is more peripheral to the living body measuring part than the living body measuring part. There is a problem that congestion occurs and adversely affects the pressure pulse waveform.

[0009]

As described above, in the conventional pressure pulse wave sensor, the sensor sensitivity is not sufficient, the stability of the sensor is not sufficient, and skill is required to adjust the angle of the sensor. Or As a result, the S / N of the output signal
Is not good.

In the case of using a belt for fixing the sensor, the belt and the sensor press the entire circumference of the mounting portion, causing congestion of peripheral veins, which adversely affects the measured arterial waveform.

Further, since a small sensor is used, S / S
Not only is there a disadvantage in improving N, but also the manufacturing cost is increased.

The present invention has been made in view of the above-mentioned problems, and measures a pressure pulse wave at a low cost while ensuring sufficient sensor sensitivity, stabilizing the mounting of the sensor, preventing venous stasis, and measuring the pressure pulse wave at a low cost. It is an object of the present invention to provide a pressure pulse wave sensor that performs

[0013]

In order to achieve the above-mentioned object, a pressure pulse wave sensor according to the present invention measures an internal pressure waveform of an artery from a body surface. An artery pressing portion having a body surface pressing surface having an area suitable for obtaining, a flexible fixing plate on which the arterial pressing portion is attached to one surface, and a larger arterial pressing portion than the body surface pressing surface of the arterial pressing portion. A pressure detecting element (e.g., a pressure-sensitive sensor) that has a pressure-sensitive portion having an area and is attached to the other surface of the fixed plate and detects deflection of the fixed plate; a fixed-plate support portion that supports the fixed plate;
The fixing plate support portion is attached, and a pressing means for generating a pressure for pressing an artery from the body surface by the artery pressing portion via the fixing plate support portion and the fixing plate is provided.

When the pressure pulse wave sensor is attached to a living body part, the artery is pressed by the artery pressing portion. Then, the flexible fixing plate with the arterial pressing portion attached to one surface bends,
The amount of deflection changes according to the pressure pulse wave of the artery. The change in the amount of deflection of the fixed plate is detected as an internal pressure waveform (pressure pulse waveform) by a pressure detection element attached to the other surface of the fixed plate.

In this pressure pulse wave sensor, the arterial pressing portion has a body surface pressing surface having an area suitable for obtaining the internal pressure waveform of the artery, and the pressure detecting element is located between the body surface pressing surface of the arterial pressing portion. Also have a large area pressure sensitive part. In other words, the pressure detecting element is larger than the arterial pressing portion, and can use a high-sensitivity, large-sized pressure-sensitive sensor, thereby reducing the manufacturing cost.

The body surface pressing surface of the arterial pressing portion has an area suitable for obtaining the internal pressure waveform of the artery. The term "area suitable for obtaining the internal pressure waveform of the artery" herein is used. For example, if the body surface pressing surface is circular, it means a circular area having a diameter approximately equal to or less than the artery diameter, or, if the body surface pressing surface is square, the artery diameter is also It means a square area having sides of the same degree or smaller than the diameter of the artery (sides in the direction perpendicular to the running direction of the artery). Therefore, if the internal pressure waveform is obtained, the shape of the body surface pressing surface is not specified.

In the above basic configuration, a flexible angle-stable support having a non-flexible portion on one surface of a fixed plate and an end surface located on the same plane as a body surface pressing surface of an arterial pressing portion attached to the one surface. When the pressure pulse wave sensor is attached to the living body part, the body surface pressing surface of the arterial pressing portion and the end surface of the angle stabilizing support portion are flush with each other, and the arterial pressing portion and the pressure detection for the artery are provided. The direction (angle) of the element becomes constant, the angle stability of the pressure detection element with respect to the artery in particular is improved, and the S / N of the output signal from the pressure detection element is improved.

The angle stabilizing support may be provided at a portion other than the relative portion of the artery. In this case, when the pressure pulse wave sensor is mounted, the artery is pressed only by the artery pressing portion. Alternatively, if the angle stabilizing support is provided also in the relative portion of the artery, it is not necessary to align the running direction of the artery with the angle stabilizing support.

On the other hand, the pressure detecting element may be attached to the other surface of the fixed plate as a separate component, but may also have the function of the fixed plate. In this case, since a fixing plate is not required, the number of parts can be reduced, and the cost can be suppressed.

In addition, a plurality of fixing plates may be provided along the traveling direction of the artery, and the artery pressing portion and the pressure detecting element may be attached to one surface and the other surface of each fixing plate. In the pressure pulse wave sensor of this embodiment, the artery is easily pressed by any one of the plurality of artery pressing portions,
Mounting of the pressure pulse wave sensor on the living body is facilitated. In addition, even if mounting is performed roughly and even if an internal pressure waveform cannot be obtained with one pressure detecting element, there is a high possibility that an internal pressure waveform can be obtained with another pressure detecting element, so that the internal pressure waveform can be reliably captured. .

On the other hand, the shape of the artery pressing portion is not specified, and may have the same thickness from the body surface pressing surface to the mounting surface to the fixed plate. However, if the mounting surface to the fixing plate is smaller than the body surface pressing surface, a portion that does not contribute to the bending of the fixing plate when pressure is applied to the artery pressing portion can be reduced, and the pressing force on the body surface is the same. In this case, as the area of the mounting surface is smaller, the amount of deflection of the fixing plate increases, and the internal pressure waveform can be more reliably captured.

Furthermore, claim 1, claim 2, claim 3,
A mounting means is provided for mounting the pressure pulse wave sensor according to claim 4, 5, 6, or 7 on a living body, and the mounting means provides a pressure pulse when the pressure pulse wave sensor is mounted on the living body. A non-pressing region may be formed between the wave sensor and a living body part around the wave sensor. In this way, when the pressure pulse wave sensor is mounted, a return path for venous blood is secured, congestion of peripheral veins does not occur, and adverse effects on the living body due to the mounting of the pressure pulse wave sensor can be prevented.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments.

FIG. 1 is a cross-sectional view of the pressure pulse wave sensor according to the embodiment, and FIG. 2 is a bottom view (a plan view of the body surface side) thereof. The pressure pulse wave sensor 1A includes an artery pressing portion 2 having a body surface pressing surface 2a having an area suitable for pressing an artery to obtain an internal pressure waveform (pressure pulse waveform) of the artery; 2 has a flexible fixing plate 3 attached to one surface and a pressure-sensitive portion having an area larger than the body surface pressing surface 2a of the arterial pressing portion 2 and is attached to the other surface of the fixing plate 3 3, a pressure detecting element 4 for detecting the deflection of the fixed plate 3, a fixed plate supporting portion 5 for supporting the fixed plate 3, and the fixed plate supporting portion 5 is attached. 2, a pressing means 6 for generating pressure for pressing an artery from the body surface. However, the pressing means 6 is formed of an air bag made of resin or rubber or a bellows-shaped bag here, and obtains a pressing force by inflating the bag.

Further, the pressure pulse wave sensor 1A is inserted through a housing 7 to which the pressing means 6 is fixed, and a ring 9 having one end connected to one end of the housing 7 and the other end mounted on the other end of the housing 7. The fixing belt 8 is provided with a hook-and-loop fastener 10. Since the pressure pulse wave sensor 1A is for a wrist, the housing 7 has a length about the width of a wrist. Here, the mounting means for mounting the pressure pulse wave sensor 1A to the living body is constituted by the housing 7, the fixed belt 8, and the like.

The output cable 11 connected to the pressure detecting element 1 is pulled out from the side surface of the fixed plate supporting portion 5, and
Air tube 12 connected to a bag constituting pressing means 6
Is pulled out from the side of the pressing means 6, and the output cable 1
1 and the air tube 12 are integrated into a pressure pulse wave sensor 1A.
Is derived outside.

Further, the components of each section will be described in detail.

The arterial pressing portion 2 has a cylindrical shape, is made of a non-deformable material (for example, hard resin), and is attached to the center of the fixed plate 3. The body surface pressing surface 2a of the arterial pressing portion 2
Has an area suitable for obtaining the internal pressure waveform of the artery, but here is a circle having a diameter approximately equal to or less than the diameter of the artery.

The circular fixing plate 3 is made of a flexible metal or resin. The disc-shaped pressure detecting element 4 attached to the other surface of the fixed plate 3 is made of piezoelectric ceramics, a piezoelectric polymer resin, or a strain gauge, and is opposite to the artery pressing portion 2 attached to one surface of the fixed plate 3. It is located at the center of the surface (the other surface). That is, the pressure detecting element 4 is positioned so that the pressure-sensitive part includes the artery pressing part 2 via the fixing plate 3.

One end of the cylindrical fixed plate supporting portion 5 supports the fixed plate 3 at a peripheral portion (insensitive portion) of the fixed plate 3.
The other end is attached to the pressing means 6.

In the pressure pulse wave sensor 1A, the non-deflected portion (peripheral portion) on one surface of the fixed plate 3 is flush with the body surface pressing surface 2a of the arterial pressing portion 2 attached to the one surface. A flexible angle stabilizing support 15 having a located end face 15a is mounted. The substantially annular angle stabilizing support portion 15 is made of a flexible material (for example, a foamed resin), and has flexibility similar to the flexibility of the fixing plate 3 here. That is, the angle stabilizing support portion 15 has a bending amount equivalent to the bending amount of the fixed plate 3 with respect to the pressing of the artery pressing portion 2 against the artery.

By providing the angle stable support portion 15,
When the pressure pulse wave sensor 1A is attached to a living body site, the body surface pressing surface 2a of the arterial pressing portion 2 and the end surface 1 of the angle stable supporting portion 15
5a becomes the same plane, the direction (angle) of the arterial pressing portion 2 and the pressure detecting element 4 with respect to the artery becomes constant, and the angle stability of the pressure detecting element 4 with respect to the artery in particular is improved. S / N of the output signal is improved.

Further, the angle stabilizing support 15 is provided in a portion other than the relative portion of the artery. This is, for example, FIG.
As is clear from FIG.
Is formed. This notch 15b
When the pressure pulse wave sensor 1A is attached to a living body, if the artery passes through the position of the notch 15b, the artery is pressed only by the artery pressing portion 2.

Further, since the body surface pressing surface 2a of the artery pressing portion 2 and the end surface 15a of the angle stabilizing support portion 15 form the same height, the artery is pressed by the surface from the body surface which is a premise of the principle of tonometry. It becomes possible.

In the pressure pulse wave sensor 1A, for example, assuming that the pressure pulse wave sensor 1A is to be worn on the wrist, the diameter of the artery pressing portion 2 is 2 mm and the diameter of the pressure detecting element 4 is
mm, and the diameter of the angle stable support portion 15 is 10 mm.

The pressure pulse wave sensor 1A configured as described above
Is attached to a wrist 70 as a living body part as shown in FIG. 3, for example, a bone 71 and a radial artery 7
2, the free end of the fixing belt 8 is inserted into the ring 9 so that the artery pressing part 2 faces the radial artery 72, turned back, and fixed with the hook-and-loop fastener 10.

When air is sent to the pressing means 6 through the air tube 12 after the mounting, the pressing means 6 pushes the artery pressing section 2 through the fixed plate supporting section 5 and the fixed plate 3, and the arterial pressing section 2
Presses the artery 72 with a predetermined pressure applied to the pressing means 6. Then, the arterial pressing portion 2 receives a force corresponding to the pressure pulse wave waveform of the artery 72, and the reaction causes the fixed plate 3 to bend with the fixed plate supporting portion 5 as a fulcrum. The pressure detecting element 4 generates an electromotive voltage corresponding to the bending of the fixed plate 3, and an output thereof is led out of the pressure pulse wave sensor 1 </ b> A through the output cable 11.

In the pressure pulse wave sensor 1A, since the pressure sensing portion of the pressure detecting element 4 (the portion attached to the fixed plate 3) has a larger area than the body surface pressing surface 2a of the arterial pressing portion 2, the arterial pressing portion A large output can be obtained with respect to the displacement of the second fixed plate 3 in the direction. Further, since a large pressure detecting element 4 can be used, a low-cost, high-sensitivity pressure-sensitive sensor can be used as compared with a minute pressure-sensitive sensor.

Further, since the housing 7 is set to have a length about the width of the wrist 70, the fixing belt 8
A region (space) in which the living body is not pressed is formed outside the fixed plate supporting portion 5 in a state where the body is wound around the wrist 70. The living body site in the non-pressed region serves as a venous blood return path, and congestion of the peripheral vein occurs. Absent.

FIG. 4 is a sectional view of a pressure pulse wave sensor according to another embodiment, and FIG. 5 is a bottom view thereof (a plan view of the body surface side).
The pressure pulse wave sensor 1B has substantially the same configuration as that of the pressure pulse wave sensor 1A, except that the shape of the angle stable support portion 16 is different. That is, the angle stabilizing support 16 has an L-shaped cross section and is also provided in a relative portion of the artery, and the notch 15b like the angle stabilizing support 15 is not formed.

When the pressure pulse wave sensor 1B is mounted on the wrist 70 as shown in FIG. 3, the artery 72 is pressed at two points of the angle stabilizing support portion 16 in addition to the artery pressing portion 2, but the pressure pulse wave sensor 1A It is not necessary to align the artery 72 with the position of the notch 15b, which is required by the pressure pulse wave sensor 1B.
There is an advantage that mounting of the camera becomes easy.

FIG. 6 is a sectional view of a pressure pulse wave sensor according to still another embodiment. The pressure pulse wave sensor 1C has substantially the same configuration as that of the pressure pulse wave sensor 1B.
Have the function of the fixing plate 3 also. In this case, since the fixing plate 3 becomes unnecessary, the number of components can be reduced, and the cost can be suppressed.

FIG. 7 is a perspective view of the front side of the pressure pulse wave sensor according to still another embodiment, and FIG. 8 is a perspective view of the back side (body front side).
FIG. 9 shows a side view as viewed from the direction of arrow A in FIG. However, the pressing means 6, the housing 7, the fixed belt 8, and the like are omitted.

The pressure pulse wave sensor 1D has three fixed plates 3
₁, 3_Two, 3_ThreeAre arranged along the direction of artery travel, and
Board 3₁, 3_Two, 3_ThreeArterial pressing part on one side of
2₁, 2 _Two, 2_ThreeAnd pressure detection on the other side
Element 4₁, 4_Two, 4_ThreeIs attached. Also,
Accordingly, each fixing plate 3₁, 3_Two, 3_ThreeBoth ends of the other side of
The part is supported by two prismatic fixed plate support parts 5 ', while
At both ends of the surface, an angle stable support portion 17 having an L-shaped cross section is provided.
Installed.

A gap 17 is provided between the two angle stable support portions 17.
b is provided, and the arterial pressing portions 2 ₁ ,
2 _2, 2 ₃ are located. Of course, the artery pressing section 2 _{1, 2} 2,
The end face 17a of the 2 ₃ of the body pressing surface 2a _1, 2a _2, 2a ₃ and the angle stable support part 17 belonging to the same plane. The pressing means 6 (not shown) is mounted on one end surface of the fixed plate supporting portion 5 '.

In the pressure pulse wave sensor 1D of this embodiment, the artery is easily pressed by any one of the three artery pressing portions 2 ₁ , 2 ₂ , and 2 ₃ , so that the pressure pulse wave with respect to the living body is obtained. Mounting of the sensor 1D becomes easy. Moreover, even if the mounting is performed roughly and even if one of the three pressure detecting elements 4 ₁ , 4 ₂ and 4 ₃ cannot obtain the internal pressure waveform, the other pressure detecting element can obtain the internal pressure waveform. Since the possibility is high, it is possible to reliably capture the internal pressure waveform.

An example of the dimensions of each part of the pressure pulse wave sensor 1D will be described. In the case of application to the wrist, each of the fixing plates 3 ₁ , 3 ₂ , 3
_3, the length is 10 mm, the width is 2 mm, the interval between the fixed plates is 0.3 mm, and the length of the fixed plate support 5 'is 10 mm.

FIG. 10 is a side view of a pressure pulse wave sensor according to a modification of the pressure pulse wave sensor 1D. This pressure pulse wave sensor 1
In E, only one end of the other surface of each of the fixed plates 3 ₁ , 3 ₂ , 3 ₃ is supported by the fixed plate support 5 ′, and the fixed plates 3 ₁ , 3 ₂ , 3
_This is a so-called "cantilever" mode in which the other end of ₃ is a free end. Arterial pressing portions 2 ₁ , 2 ₂ , 2 ₃ are attached to opposite surfaces of the free ends of the fixed plates 3 ₁ , 3 ₂ , 3 ₃ , respectively.
Each fixed plate 3 _1, 3 _2, 3 _3, respectively the pressure sensing element portion of the fixed end-sided 4 _1, 4 _2, 4 ₃ are attached.

Note that the pressure pulse wave sensors 1A to 1A
1E, the arterial pressing portion 2 has a columnar shape,
The body surface pressing surface 2a may be larger than the mounting surface to the fixing plate 3. FIG. 11 is a cross-sectional view showing an example of the configuration of the pressure pulse wave sensor 1A shown in FIG. The arterial pressing portion 2 'here has a truncated frustoconical shape, and its bottom surface is a body surface pressing surface 2a'.
The top surface is a mounting surface to the fixing plate 3.

By making the mounting surface to the fixing plate 3 smaller than the body surface pressing surface 2a ', a portion that does not contribute to the bending of the fixing plate 3 against the pressing force of the body surface pressing surface 2a' to the body surface can be reduced. When the pressing force against the body surface is the same, the smaller the area of the mounting surface, the more the amount of bending of the fixed plate 3 increases, and the more reliably the internal pressure waveform can be captured.

Next, FIG. 12 shows a block diagram of an example of a pulse wave measuring device using the above-mentioned pressure pulse wave sensor 1A (which may be any of the pressure pulse wave sensors 1B to 1E). However, the airbag 20 in the pressure pulse wave sensor 1A is an airbag constituting the pressing means 6. According to this pulse wave measuring device, after attaching the pressure pulse wave sensor 1A to the wrist 70 as shown in FIG.
The CPU 40 receives the measurement instruction from the input SW 45 and monitors the internal pressure of the airbag 20 with the pressure sensor 32.
Pressurization by the pump 31 is performed up to a predetermined pressure (for example, a pressure equal to or lower than the diastolic blood pressure).

This pressurization causes the arterial pressing portion 2 as described above.
Presses the artery 72, the fixed plate 3 is bent as a reaction, and the pressure detecting element 4 generates an electromotive voltage or a change in resistance according to the bent of the fixed plate 3. The output of the pressure detecting element 4 is amplified by the amplifier 30, converted into a digital signal by the A / D converter 41 of the CPU 40, and stored in the memory 42. The arithmetic unit 43 of the CPU 40 performs predetermined waveform arithmetic processing and the like. And measurement waveforms and other indices (eg pulse rate, acceleration pulse wave index, Augmentation I
ndex) is displayed on the display device 44.

The filter 3 in the block diagram of FIG.
Numerals 3 and 34 are for removing noise of signals from the pressure sensor 32 and the amplifier 30, respectively. Also, C
The PU 40 is supplied with power from a power supply 46.

[0054]

As described above, according to the pressure pulse wave sensor of the present invention, since the pressure detecting element is larger than the arterial pressing portion, it is possible to use a large-sized, high-output high-sensitivity sensor. This makes it possible to reduce the manufacturing cost.

By providing the angle stabilizing support, the angle stability of the pressure detecting element with respect to the artery is improved,
The internal pressure waveform of the artery is measured stably, and the S / N of the output signal from the pressure detecting element is improved.

Further, by providing the mounting means, when the pressure pulse wave sensor is mounted, a return path for venous blood is secured, congestion of peripheral veins does not occur, and the pressure pulse wave sensor is attached to the living body. The adverse effects can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pressure pulse wave sensor according to one embodiment.

FIG. 2 is a bottom view (a plan view on the body surface side) of the pressure pulse wave sensor of FIG. 1;

FIG. 3 is a cross-sectional view when the pressure pulse wave sensor of FIG. 1 is mounted on a wrist.

FIG. 4 is a cross-sectional view of a pressure pulse wave sensor according to another embodiment.

FIG. 5 is a bottom view (a plan view of the body surface side) of the pressure pulse wave sensor of FIG. 4;

FIG. 6 is a sectional view of a pressure pulse wave sensor according to still another embodiment.

FIG. 7 is a front perspective view of a pressure pulse wave sensor according to still another embodiment.

FIG. 8 is a perspective view of the back side (body surface side) of the pressure pulse wave sensor of FIG. 7;

FIG. 9 is a side view of the pressure pulse wave sensor of FIG.

FIG. 10 is a side view of a pressure pulse wave sensor according to a modification of the pressure pulse wave sensor of FIG. 7;

FIG. 11 is a sectional view of a pressure pulse wave sensor according to a modification of the pressure pulse wave sensor of FIG. 1;

12 is a block diagram of an example of a pulse wave measuring device using the pressure pulse wave sensor of FIG.

[Explanation of symbols]

 Reference Signs List 1 (A to E) Pressure pulse wave sensor 2, 2 ′ Artery pressing portion 2 a, 2 a ′ Body surface pressing surface 3 Fixing plate 4 Pressure detecting element 5, 5 ′ Fixing plate support 6 Pressing means 7 Housing (mounting means) 8 Fixed belt (wearing means) 15, 16 Angle stabilizing support 15a, 16a End face 17 Angle stabilizing support 17a End face 70 Wrist 72 Artery

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazunobu Itonaga Shiokyo-dori, Shimogyo-ku, Kyoto 801 Minami-Fudo-do, Higashi-iri, Horikawa Inside Omron Life Science Research Institute, Inc. (72) Inventor Toshio Otani, Shio-dori, Shimogyo-ku, Kyoto 801 Horikawa Higashiiri Minami Fudo-do Town OMRON Life Science Laboratory Co., Ltd. F-term (reference) 2F055 AA05 BB14 CC02 CC14 DD19 EE40 FF11 GG11 HH03 4C017 AA09 AA10 AB02 AC03 BB12 BC01 BC07 CC01

Claims (8)

[Claims] 1. A pressure pulse wave sensor for measuring an internal pressure waveform of an artery from a body surface, comprising: an artery pressing portion having a body surface pressing surface having an area suitable for pressing an artery to obtain an internal pressure waveform of the artery. The artery pressing portion has a flexible fixing plate attached to one surface, and a pressure-sensitive portion having an area larger than the body surface pressing surface of the arterial pressing portion, and is attached and fixed to the other surface of the fixing plate. A pressure detecting element for detecting the bending of the plate, a fixed plate support for supporting the fixed plate, and the fixed plate support is attached to the artery. A pressure means for generating a pressure for pressing the pressure pulse wave. 2. A non-deflection portion on one surface of the fixing plate is provided with a flexible angle stabilizing support having an end surface located on the same plane as a body surface pressing surface of an arterial pressing portion attached to the one surface. The pressure pulse wave sensor according to claim 1, wherein the pressure pulse wave sensor is provided. 3. The pressure pulse wave sensor according to claim 2, wherein the angle stabilizing support is provided at a portion other than a relative portion of the artery. 4. The pressure according to claim 2, wherein the angle-stable support portion has a strain amount equivalent to a strain amount of the fixed plate when the artery pressing portion is pressed against the artery. Pulse wave sensor. 5. The pressure pulse wave sensor according to claim 1, wherein said pressure detecting element has a function of a fixing plate. 6. The fixing plate according to claim 1, wherein a plurality of the fixing plates are provided along the running direction of the artery, and the artery pressing portion and the pressure detecting element are respectively attached to one surface and the other surface of each fixing plate. The pressure pulse wave sensor according to claim 1, claim 2, claim 3, claim 4, or claim 5. 7. The artery pressing portion has a body surface pressing surface that is larger than a mounting surface to a fixed plate.
Claim 2, Claim 3, Claim 4, Claim 5, or Claim 6
The pressure pulse wave sensor according to any one of the preceding claims. 8. A mounting means for mounting the pressure pulse wave sensor according to claim 1, 2, 3, 4, 5, 6, or 7 on a living body. Means are
The non-pressing region is formed between the pressure pulse wave sensor and a living body part around the pressure pulse wave sensor when the pressure pulse wave sensor is attached to a living body. 4,
The pressure pulse wave sensor according to claim 5, 6, or 7.