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DESCRIPTION JPH0365900

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DESCRIPTION JPH0365900
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
labor monitoring device, and more particularly to an ultrasonic Doppler sensor for measuring
heart rate information of a fetus. [Prior art and its subject] Ultrasonic Doppler sensors using
ceramic piezoelectric elements have hitherto been widely used clinically as a means for obtaining
heartbeat information of the fetus. However, since the piezoelectric element itself is hard and
fragile, it is difficult to make a sensor with a large area. Therefore, when a polymeric piezoelectric
material is used, the frequency in this application field is mainly 1 to 3.5 ?Hz, and the thickness
of the polymeric piezoelectric material needs to be 300 to 1000 ?m. Therefore, because the
thickness is large, dielectric breakdown is likely to occur at the time of polarization, and the yield
is not only poor, but even when the thickness is 400 to 1000 ?m, it becomes rigid even if it is
polymer type. The piezoelectric film may be cracked and broken. SUMMARY OF THE INVENTION
In order to solve the above-mentioned problems, the sensor according to the present invention
has an acoustic impedance of at least 15 О 10 6 kg / m 2 и S or more on at least one side of a
film-like polymeric piezoelectric material as shown in the first and second figures. A metal plate
of 10 to 300 .mu.m is attached and coated with a flexible polymer material. With such a
configuration, even when the sensor is bent, expansion and contraction occur around the filmlike metal plate 2 attached to the polymer-based piezoelectric material 1, and therefore the
elongation of the piezoelectric material 1 becomes small, and breakage occurs There is no risk of
Further, when the film-like metal plate 2 having a large acoustic impedance is attached to the
polymer-based piezoelectric material 1, the amplitude is suppressed and the frequency becomes
lower than that of the conventional one, and the vibration is performed at the desired frequency l
to 3.5 MHz. Sound waves can be generated, and the piezoelectric material can be thinned.
DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail
based on the drawings. FIG. 1 is a cross-sectional view showing the configuration of an
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embodiment of the sensor of the present invention, and FIG. 2 is a detailed cross-section showing
the configuration of an example of the sensor unit. In FIG. 1, 1 is a film-like polymer-based
piezoelectric material, a metal plate 2 having an acoustic impedance of 15 О 10 'kg / m 2 и S or
more on at least one side and a thickness of 10 to 300 ?m, for example, a copper plate 2 having
a thickness of 80 ?m. Is attached. On the other side of the polymeric piezoelectric material 1, a
shield material 3 ░, for example, a film-like mesh copper plate 3 is attached. A plastic film 4
such as a white polyester film is coated on the copper plate 2.3, and a flexible polymer material 5
such as urethane rubber is coated except for the central portion on the side of the bowl-like
copper plate 2.
The polymer-based piezoelectric material 1 refers to a piezoelectric body made of a synthetic
polymer substance, or a composite-type piezoelectric body obtained by kneading a ferroelectric
ceramic powder in a polymer substance, specifically, polyfluorinated Vinylidene resin film,
copolymer of vinylidene cyanide and copolymerizable vinylidene with vinylidene, for example,
vinyl acetate, vinylidene fluoride and other copolymerizable monomers (eg, EVA, vinylidene
cyanide, etc.) Piezoelectric materials obtained by stretching and polarizing copolymer resin films
etc., ferroelectric ceramics (eg, lead zirconate titanate) and polymers (eg, polyvinylidene fluoride
resin, copolymer resin of vinylidene fluoride, nylon resin, polyacetal resin, One or more of
fluorine-based comb, NBR, chloroprene rubber, chlorhydrin rubber, and chlorinated polyethylene
elastomer A piezoelectric polymer composite material which has been subjected to polarization
treatment to composite to consist of two or more thereof) are used. The thickness is preferably
about 30 to 350 ?m. As the film-like metal plate 2, copper, lead, stainless steel. Phosphor
bronze, nickel, etc. can be used, and if the acoustic impedance is small, the effect of lowering the
resonance frequency will be small. Therefore, as the film metal plate 2, one having an acoustic
impedance of 15 О 10 'kg / m 2 и S or more is required. Generally, the thickness of the metal
plate 2 is preferably 10 to 300 ?m, particularly 30 to 200 ?m, can oscillate at a frequency of 1
to 3.5 ?Hz, and is less likely to cause dielectric breakdown at the time of polarization, and the
electromechanical coupling constant becomes large. And yield is also improved. ???????
??????????????? Polyimide is suitable. Further, as the flexible polymer material,
urethane rubber, silicone rubber, thermoplastic elastomer, etc. can be used. 3 (a) to 3 (a) show an
example of the bonded structure of the polymeric piezoelectric material and the film-like metal
plate in the present invention, and FIG. 3 (a) shows a film on one surface of the polymeric
piezoelectric material 1. An example in which the metal plate 2 is attached, FIG. 3 (5) is an
example in which the metal plate 2 is attached to both sides of the polymeric piezoelectric
material 10, and FIG. 3 (C) is a polymeric piezoelectric material 1 on both sides of the metallic
plate 2. In the example of FIG. 3 (a) and FIG. 3 (a), two polymer piezoelectric materials 1 are
adhered in two layers on one surface of the metal plate 2, and any structure may be used. FIG. 4
shows the transmission of ultrasonic waves constituting the sensor of the present invention. The
sensor 13 of the present invention comprises an ultrasonic wave transmitting unit 6 and an
ultrasonic wave receiving unit 7, and the transmitting and receiving unit 6.7 is constructed using
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a polymeric piezoelectric material l. It is a thing.
The transmitting unit 6 and the receiving unit 7 in the present invention attach the common
electrode 8 to the back surface of the polymeric piezoelectric material 1 as shown in FIG. 5, and
the transmitting electrode 9 constituting the transmitting unit 6 and the reception are formed on
the upper surface. The receiving electrode 10 constituting the portion 7 is formed with a slight
gap. Further, the transmission electrode 9 and the reception electrode 10 are disposed in a
mutually fitted state as a comb shape as shown in FIG. The common electrode 89 transmitting
electrode 9 and the receiving electrode 10 can be formed by vapor deposition of aluminum,
attachment of a conductive rubber, or the like. The leads 8a, 9a, 10a of each electrode 8.9. 10 are
connected to the plug 12 via the cable 11. 14 is a cable terminal portion, and 8a-10a are ground
lines respectively. It is connected to the cable 11 as a transmission signal line and a reception
signal line. 15 is a ground terminal connected to the lead wire (ground wire) 8a, 16 is a
transmission terminal connected to the lead wire (transmission signal wire> 9a), 17 is a reception
terminal connected to the lead wire (reception signal wire) 10a is there. The plug 12 is connected
to a device main body (not shown) that generates a ultrasonic wave by transmitting a high
frequency in the ultrasonic region and applying the high frequency to the common electrode 8
and the transmitting electrode 9. Also, the reflected wave of the generated ultrasonic wave is
received by the receiving unit 7, and an electrical signal is generated between the common
electrode 8 and the receiving electrode 10. The generated electrical signal is input to the
apparatus body and configured to be displayed on a display such as an oscilloscope. Although the
transmitting unit 6 and the receiving unit 7 are divided in the above embodiment, the dividing
may be omitted and a single electrode may be formed on the entire surface to share transmission
and reception. With such a configuration, even when the sensor is bent, expansion and
contraction occur around the film-like metal plate 2 attached to the polymer-based piezoelectric
material 1, and therefore the elongation of the piezoelectric material 1 becomes small, and
breakage occurs There is no risk of Further, when the film-like metal plate 2 having a large
acoustic impedance is attached to the polymer-based piezoelectric material l, the amplitude is
suppressed and the frequency becomes lower than that of the conventional one, and it is possible
to generate low frequency ultrasonic waves. . FIG. 6 is a view showing the relationship between
the thickness and the frequency of the polymer-based piezoelectric material, wherein the a-line
shows the case of only the piezoelectric material and the b-line shows the case where a metal
plate is attached to the piezoelectric material. FIG. 7 is a cross-sectional view showing the state of
use of the present invention. The sensor 13 of the present invention is a mother as shown in FIG.
Fit on the wall 18 and mount it. A high frequency pulse wave or burst wave voltage is
transmitted to the transmission unit 6 by the cable 11. When added through the plug 12,
ultrasound is generated, and the ultrasound is applied to the heart of the fetus 19 in the mother's
body.
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The Doppler signal (acoustic signal) that is reflected by the fetal heart surface or a valve and
modulated by the movement of the heart is converted to a fetal heartbeat signal (electric signal)
at the sensor reception unit, and the cable 11. The plug 12 leads to the device body. The
transmitting unit 6 and the receiving unit 7 are configured using the polymer-based piezoelectric
material 1, and the whole is covered with the flexible polymer material 5, and the thickness is
several mm, so that the whole is flexible and the element area is wide. By doing this, it is possible
to collect a very wide range of fetal heartbeat information. As described above, according to the
present invention, the area of the transmitting unit and the receiving unit is wide and flexible, so
that during delivery the ultrasonic doppler sensor of the present invention is mounted in the
advancing direction of the fetus. Thus, it is possible to obtain optimal heartbeat information
without having to change (re-adjust) the position of the sensor every time the fetus gradually
moves as in the prior art, and it is possible to save management. Also in the examination during
pregnancy, even if the fetus moves a little, since the area of transmission and reception of
ultrasonic waves is large, the frequency of reparation at delivery and sensor position can be
extremely reduced. In addition, because the whole is flexible, the conventional ceramic sensor
produces a strong feeling of pressure and discomfort on the surface of the base, but this can be
extremely improved. In addition, since a metal plate is attached, a low frequency can be oscillated
with a thin piezoelectric material with a thin film thickness, and even when using high
frequencies of about 1 to 3 and 5 MHz, a sensor excellent in flexibility can be obtained. .
Furthermore, no breakage occurs in the piezoelectric material due to the occurrence of
elongation in the piezoelectric material as well.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view showing the configuration of an embodiment of the sensor of the
present invention, FIG. 2 is a detailed cross section showing the configuration of an example of
the sensor portion, and FIGS. 3 (a)-(d) are polymers according to the present invention FIG. 4 is a
cross-sectional view showing an example of the structure of transmission and reception of
ultrasonic waves constituting the sensor of the present invention, and FIG. 5 is a cross-sectional
view showing an example of the bonded structure of a piezoelectric material and a film metal
plate. FIG. 6 is a cross-sectional view showing the configuration of the piezoelectric element
portion, FIG. 6 is a view showing the relationship between the thickness and frequency of the
polymer-based piezoelectric material, and FIG. 7 is a cross-sectional view showing a use state of
the present invention.
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1 ииииии Polymer-based piezoelectric material, 2 ииииии Membrane metal plate (copper plate), 3 ииииии
Shield material (membrane mesh copper plate), 4 иии plastic film (polyester film), 5 ииииии flexible
polymer material (urethane rubber), 6 ...... transmitter unit, 7 ...... receiver, 8 ... ... common
electrode, 8a = 9a, 10a ...... lead, 9 ...... transmission electrode, 10 ...... receiving electrodes, 11 ......
cable , 13 ..... the sensor of the present invention. I 9 ? 5 ? ? ? 4 I ? ? ? ?
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