JP3961476B2 - Pressure pulse wave sensor and pressure pulse wave measuring device - Google Patents

Description

  The present invention includes a pressure pulse wave sensor for detecting a pressure pulse wave of a living artery as an electrical signal from the body surface, a pressure pulse wave sensor, and a fixture for mounting the pressure pulse wave sensor on a living body. It is related with the pressure pulse wave measuring device which becomes.

Patent Document 1 describes a pressure pulse wave sensor and a pressure pulse wave measurement device. The pressure pulse wave sensor described in this document includes an arterial pressing part that presses an artery of a living body, a flexible fixing plate having the arterial pressing part attached to one surface, and the other surface of the fixing plate. A pressure-sensitive element and a fixing plate support part for supporting the fixing plate are provided, and the pressure pulse wave of the living artery is regarded as the bending of the fixing plate via the arterial pressing portion, and is bent along with the bending of the fixing plate. The voltage sensor is configured to output a voltage signal corresponding to the degree of bending. Moreover, the pressure pulse wave measuring apparatus described in this document includes a belt having a hook-and-loop fastener as a fixture.
JP 2002-224064 A

  However, according to the pressure pulse wave sensor of the above prior art, the living artery is likely to be displaced from the pressing surface of the arterial pressing portion, and when it is displaced, the bending method of the pressure sensitive element is different from the bending method. Whether the pressure pulse wave cannot be accurately detected, and the change in the pressure pulse wave when monitoring for a long period of time is monitored. There is a problem that it cannot be determined. In addition, since the pressure sensitive element is fixed to the fixed plate on the whole surface, the movement of the pressure sensitive element is hindered. For this reason, unless a relatively large pressure sensitive element is used, sensitive detection cannot be performed, and the apparatus can be downsized. There is a problem that it becomes difficult.

  Moreover, according to the pressure pulse wave measuring device of the above prior art, since the belt is wound around the wrist, the pressure pulse wave measuring device for measuring the carotid artery of the neck cannot be used because the entire belt is narrowed. There is a problem.

  The present invention solves the problems of the prior art as described above, and can accurately detect the pressure pulse wave while the living artery is not easily displaced from the pressing surface of the artery pressing portion, and the device can be miniaturized. An object of the present invention is to provide a pressure pulse wave sensor capable of measuring a carotid artery while providing a pressure pulse wave sensor.

The pressure pulse wave sensor of the present invention is a pressure pulse wave sensor for detecting a pressure pulse wave of a living artery as an electrical signal from a body surface, and is attached to a pressure sensitive element and a central portion of one side of the pressure sensitive element. An arterial pressing part that presses a living artery, a pair of arterial fixing bases attached to the one side of the pressure sensitive element in parallel to each other in the arterial running direction across the arterial pressing part, and the pressure sensitive element are attached. A buffer plate having a gap in the center and a pedestal to which the buffer plate is attached, and the surface on the side of the arterial pressing portion of each arterial fixing base is configured with an inclined surface with an inclination angle of 30 to 60 degrees. It is characterized by.

  According to the pressure pulse wave sensor of the present invention, since there is a gap in the central portion of the buffer plate, the pressure sensor is flexed in a constant manner, in other words, the force is concentrated in the gap portion, and the cushion plate has a cushioning property. As a result, the pressure-sensitive element is pulled without applying an excessive force to the central portion (the portion where pressure is applied), and thus a stable and highly sensitive output can be obtained. Further, since the force concentrates on the central portion of the pressure sensitive element, the sensitivity can be kept high regardless of the size of the pressure sensitive element, and the pressure sensitive element can be reduced in size and the cost of the sensor can be reduced. Further, since the height of the gap portion only needs to be equal to or greater than the amount of bending of the pressure sensitive element, it is possible to reduce the thickness of the buffer plate, and thus to reduce the size and cost of the sensor.

  In addition, according to the pressure pulse wave sensor of the present invention, when the living artery is at a position opposite to the arterial fixing table, the pressure sensitive element does not react, and thus erroneous detection can be prevented. In addition, if the surface on the side of the artery pressing portion of the arterial fixing base is configured with an inclined surface, the living artery is not easily displaced from the artery pressing portion. In addition, since skin other than the living artery does not come into contact with the pressure sensitive element, it is less susceptible to body movement noise. In the case where an arterial fixing base is not provided, the pressure sensitive element reacts even if the living artery is displaced from the artery pressing portion, and an output including body movement noise is obtained.

  The pressure pulse wave measuring device of the present invention includes a pressure pulse wave sensor for detecting a pressure pulse wave of a living artery as an electrical signal from a body surface, and a fixture for mounting the pressure pulse wave sensor on a living body. In the pressure pulse wave measuring device, the pressure pulse wave sensor includes: a pressure sensitive element; an arterial pressing part that is attached to a central part of one side of the pressure sensitive element; On one side, a pair of arterial fixation bases attached in parallel to each other in the direction of arterial movement with the arterial pressing part interposed therebetween, a shock-absorbing plate having a gap in the central part to which the pressure-sensitive element is attached, and the shock-absorbing board are attached And the fixture has a pedestal for preventing congestion.

  According to the pressure pulse wave measuring device of the present invention, in addition to the above-described effects of the sensor, the fixture is provided with a stasis prevention base, thereby preventing adverse effects on the living body (inhibition of arterial pulsation) due to stasis. be able to.

  Further, the fixing device is provided with a position adjusting means for finely adjusting the position of the pressure pulse wave sensor in a direction orthogonal to the traveling direction of the living artery, and the pressing force of the pressure pulse wave sensor on the living artery is slightly adjusted. By providing the pressurizing force adjusting means that can be adjusted, it is possible to accurately dispose the arterial pressing portion with respect to the living artery and obtain an appropriate pressing force to the living artery. Further, by providing the pressure adjusting means, the carotid artery can be measured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is an exploded perspective view of a pressure pulse wave sensor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same pressure pulse wave sensor, and FIG. 3 is a pressure pulse wave measurement according to an embodiment of the present invention. 4 and 5 are diagrams for explaining the operation of the pressure pulse wave sensor, FIG. 6 is a sectional view of a pressure pulse wave measuring apparatus according to another embodiment, and FIG. 7 is still another embodiment. FIG. 8 to FIG. 10 are perspective views showing usage examples of the pressure pulse wave measuring device according to the embodiment.

  1 and 2, the pressure pulse wave sensor 1 according to the present embodiment includes an arterial pressure that presses a living artery 201 of a living body 200 that is attached to a pressure sensitive element 11 and a central portion of one side 11 a of the pressure sensitive element 11. In the central portion where the pressure sensitive element 11 is attached to the part 12, the pair of arterial fixation bases 13 and 13 which are attached to the one surface 11a of the pressure sensitive element 11 in parallel with each other in the arterial running direction with the artery pressing part 12 in between A buffer plate 14 having a gap 14a and a base 15 to which the buffer plate 14 is attached are provided.

  The pressure sensitive element 11 is made of piezoelectric ceramic and has a size sufficiently larger than the artery pressing portion 12, for example, Φ13 to 20 mm.

  The arterial pressing portion 12 has a size corresponding to the diameter of the blood vessel, for example, Φ3 to 5 mm, the height is the same height as the arterial fixing base 13, for example, 2 to 3 mm, and the material does not make the living body feel pain, such as rubber. It is adhesively fixed to the pressure sensitive element 11.

  The arterial fixing base 13 is made of a material with little bending, for example, an acrylic plate, and the surface 13a on the side of the arterial pressing portion 12 is configured with an inclined surface with an inclination angle of 30 to 60 degrees so that the living artery 201 does not deviate from the arterial pressing portion 12. The height is the same as that of the arterial pressing portion 12, for example, 2 to 3 mm, and the distance between the arterial fixing bases 13 is wider than the arterial pressing portion 12, for example, 4 to 6 mm. The

  The buffer plate 14 has a size equal to or larger than the diameter of the pressure-sensitive element 11, and the diameter of the gap 14 a at the center is smaller than the diameter of the pressure-sensitive element 11 and is equal to or larger than the diameter of the arterial pressing portion 12, for example, Φ3 to 7 mm. The height is such that the pressure-sensitive element 11 does not reach the pedestal 15 when the pressure-sensitive element 11 is bent, for example, 1 mm, and the material is that the pressure-sensitive element 11 moves toward the center when the pressure-sensitive element 11 is bent. For example, rubber is used, and only the outer peripheral portion of the pressure-sensitive element 11 is bonded and fixed.

  The pedestal 15 has substantially the same size as the buffer plate 14 and is made of a hard material such as an acrylic plate with little bending, and has a thickness such that the pressure-sensitive element 11 does not react when the pedestal 15 is pressed, for example 3 ~ 5 mm.

  As shown in FIG. 3, the pressure pulse wave sensor 1 having the above configuration constitutes a pressure pulse wave measuring device 100 together with the fixture 2.

  In FIG. 3, the pressure pulse wave measuring device 100 includes a pressure pulse wave sensor 1 and a fixture 2 for attaching the pressure pulse wave sensor 1 to a living body 200. The fixture 2 includes a belt 21, a hook-and-loop fastener 22 that makes it possible to adjust the effective length of the belt 21, and a stasis prevention pedestal 23 that is fixed to the inner surface of the belt 21 at an appropriate interval. The pressure pulse wave sensor 1 is attached to the fixture 2 by fixing a pedestal 15 at an appropriate position on the inner surface of the belt 21.

  The pressure pulse wave measuring device 100 is attached to the living body 200 by placing the belt 21 around the living body 200 and pressing the arterial pressing portion 12 of the pressure pulse wave sensor 1 against the living artery 201. The effective length is determined, and the pressure pulse wave measuring device 100 is attached to the living body 200 so that both ends of the belt 21 are coupled by the surface fastener 22.

  At the time of attachment or measurement, even if the position of the living artery 201 is shifted, the inclined surface 13a of the artery fixing base 13 is supported, and the center position of the living artery 201 is pressed by the artery pressing portion 12 without substantially shifting (FIG. 4). reference).

  Further, at the time of measurement, the pressure sensitive element 11 bends when the pressure of the living artery 201 is applied to the artery pressing portion 12 and outputs a voltage signal corresponding to the degree of the bend. The pressure-sensitive element 11 is bent toward the gap 14a because the gap 14a is present at the center of the buffer plate 14. At this time, the pressure-sensitive element 11 is pulled toward the central portion thereof, but the buffer plate 14 is made of rubber, and therefore the pressure-sensitive element 11 is easily moved to the central portion by elastic deformation of the buffer plate 14. It becomes pulled toward (see FIG. 5).

  Further, at the time of measurement, the stasis prevention pedestal 23 provided at an appropriate interval only comes into contact with the living body 200, and the entire circumference of the living body 200 is not tightened by the belt 21.

  As described above, the pressure pulse wave sensor 1 of the present embodiment is the same as the pressure pulse wave sensor 1 for detecting the pressure pulse wave of the living artery 201 as an electrical signal from the body surface. A pair of arterial pressing parts 12 for pressing the living artery 201 and attached to the central part of one side 11a of the element 11 and a pair of one side 11a of the pressure sensitive element 11 attached in parallel to each other in the arterial running direction with the arterial pressing part 12 interposed therebetween. Arterial fixation bases 13 and 13, a shock-absorbing plate 14 having a gap 14 a at the center, to which the pressure-sensitive element 11 is attached, and a base 15 to which the shock-absorbing plate 14 is attached.

  According to the pressure pulse wave sensor 1 of the present embodiment, since there is a gap 14a in the center of the buffer plate 14, the way of bending of the pressure sensitive element 11 becomes constant, in other words, the force concentrates on the gap 14a, Because the cushioning property of the buffer plate 14 causes the pressure sensitive element 11 to be pulled without applying an excessive force to the central portion (site where pressure is applied), a stable and highly sensitive output can be obtained. Further, since the force concentrates on the central portion of the pressure sensitive element 11, the sensitivity can be kept high regardless of the size of the pressure sensitive element 11, and the pressure sensitive element 11 can be downsized and the cost of the sensor 1 can be reduced. It becomes possible. Further, since the height of the gap 14a only needs to be equal to or greater than the amount of bending of the pressure-sensitive element 11, the buffer plate 14 can be thinned, and the sensor 1 can be reduced in size and cost.

  Further, according to the pressure pulse wave sensor 1 of the present embodiment, when the living artery 201 is at a position opposite to the artery fixing base 13, the pressure sensitive element 11 does not react, and thus erroneous detection can be prevented. In addition, since the surface on the side of the artery pressing portion 12 of the artery fixing base 13 is configured by the inclined surface 13a, the living artery 201 is not easily displaced from the artery pressing portion 12. Further, since skin other than the living artery 201 does not come into contact with the pressure-sensitive element 11, it is difficult to be affected by body movement noise.

  Further, according to the pressure pulse wave measuring apparatus of the present embodiment, by providing the fixture 2 with the stasis prevention base 23, it is possible to prevent an adverse effect (inhibition of arterial pulsation) on the living body due to the stasis.

  The pressure pulse wave measuring apparatus 100 according to another embodiment shown in FIG. 6 is characterized in that an elastic clip 25 such as a normal laundry scissors is used as the fixture 2 instead of the belt 21 as described above. . The pressure pulse wave measuring device 100 is attached to and detached from the living body 200 by operating the operation portion 25a of the elastic clip 25 with a hand or the like. The elastic force of the elastic clip 25 is set in advance so that the arterial pressing unit 12 presses the living artery 201 with an appropriate pressing force at the time of mounting.

  7A and 7B, a pressure pulse wave measuring apparatus 100 according to still another embodiment is arranged on the fixture 2 in a direction orthogonal to the traveling direction of the living artery 201. The position adjustment means 30 that enables fine adjustment is provided, and the pressure adjustment means 40 that enables fine adjustment of the pressing force of the pressure pulse wave sensor 1 against the living artery 201 is provided. Here, the position adjusting means 30 is screwed into the long groove 31 provided in the belt 21, the male screw portion 32 that is provided perpendicular to the base 15 of the pressure pulse wave sensor 1 and can be inserted into the long groove 31, and the male screw portion 32. The position of the pressure pulse wave sensor 1 can be adjusted by adjusting the position of the male screw portion 32 with respect to the long groove 31. In addition to the male screw portion 32 and the nut portion 33, the pressure adjusting means 40 includes a spring 34 that is externally fitted to the male screw portion 32, and the spring 34 is adjusted by adjusting the position of the nut portion 33 with respect to the male screw portion 32. Thus, the pressing force of the pressure pulse wave sensor 1 against the living artery 201 can be adjusted.

  According to the pressure pulse wave measuring apparatus 100, the position adjusting unit 30 and the pressure adjusting unit 40 can be provided so that the arterial pressing portion 201 can be accurately disposed opposite to the living artery 201, and the living artery 201 It is possible to obtain an appropriate pressing force with respect to. Further, by providing the pressure adjusting means 40, the carotid artery can be measured.

  The pressure pulse wave measuring apparatus 100 including the position adjusting unit 30 and the pressure adjusting unit 40 is used by being attached to the wrist of the living body 200 as a belt type shown in FIG. 3, for example, as shown in FIG. Alternatively, as shown in FIG. 9, the clip type shown in FIG. 6 is used by being attached to the wrist of the living body 200, or as shown in FIG. 10, as a fixed type attached in advance to the mounting table 300. Used on the wrist of the hand placed on the table.

It is a disassembled perspective view of the pressure pulse wave sensor which concerns on one Embodiment of this invention. It is sectional drawing of the same pressure pulse wave sensor. It is sectional drawing of the pressure pulse wave measuring device which concerns on one Embodiment of this invention. It is operation | movement explanatory drawing of a pressure pulse wave sensor. It is operation | movement explanatory drawing of a pressure pulse wave sensor. It is sectional drawing of the pressure pulse wave measuring device which concerns on other embodiment. It is the top view and sectional view of the principal part of the pressure pulse wave measuring device concerning other embodiments. It is a perspective view showing the example of use of the pressure pulse wave measuring device concerning an embodiment. It is a perspective view showing the example of use of the pressure pulse wave measuring device concerning an embodiment. It is a perspective view showing the example of use of the pressure pulse wave measuring device concerning an embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure pulse wave sensor 11 Pressure sensitive element 12 Arterial press part 13 Arterial fixation base 13a Inclined surface 14 Buffer board 14a Space | gap 15 Base 2 Fixing tool 23 Base for anti-congestion 30 Position adjustment means 40 Pressure adjustment means 100 Pressure pulse wave measuring device 200 living body 201 living body artery

Claims (3)

In the pressure pulse wave sensor for detecting the pressure pulse wave of the living artery as an electrical signal from the body surface,
A pressure-sensitive element, an arterial pressing part that presses a living artery, attached to the central part of one side of the pressure-sensitive element, and the one-sided side of the pressure-sensitive element, parallel to each other in the arterial running direction with the arterial pressing part interposed therebetween A pair of arterial fixation bases attached to the pressure-sensitive element, a shock-absorbing plate to which the pressure-sensitive element is attached, having a gap in the center, and a pedestal to which the shock-absorbing plate is attached ,
A pressure pulse wave sensor characterized in that the surface on the arterial pressing portion side of each arterial fixing base is formed of an inclined surface with an inclination angle of 30 to 60 degrees . In a pressure pulse wave measuring device comprising a pressure pulse wave sensor for detecting a pressure pulse wave of a living artery as an electrical signal from the body surface, and a fixture for mounting the pressure pulse wave sensor on a living body,
The pressure pulse wave sensor includes a pressure-sensitive element, an arterial pressing part that presses a living artery, attached to a central part of one side of the pressure-sensitive element, and the arterial pressing part sandwiched between the one side of the pressure-sensitive element. A pair of arterial fixation bases attached in parallel to each other in the arterial running direction, a buffer plate having a gap in the center to which the pressure sensitive element is attached, and a pedestal to which the buffer plate is attached,
The pressure pulse wave measuring device, wherein the fixture has a stasis for preventing congestion.   The fixture has a position adjusting means that allows the position of the pressure pulse wave sensor to be finely adjusted in a direction orthogonal to the traveling direction of the living artery, and can finely adjust the pressing force of the pressure pulse wave sensor on the living artery. 3. The pressure pulse wave measuring apparatus according to claim 2, further comprising a pressure adjusting means for adjusting the pressure.

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