JP2007167118

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DESCRIPTION JP2007167118
An ultrasonic probe capable of accurately detecting the maximum temperature in all the
transducers in a short time with a minimum number of heat sensors, and an ultrasonic diagnostic
apparatus using the same. SOLUTION: An ultrasonic probe 1 is arranged in one dimension or two
dimensions, and a plurality of transducers 2 of which one end face forms an ultrasonic wave
generation surface, and integrally on the back side of these transducers A backing 3 mounted
and attenuating ultrasonic waves, and a strip formed of a material having a thermal conductivity
higher than that of the backing, one side end of which is in contact with each of the onedimensionally arranged transducers; A heat conducting layer 4 inserted in the backing so that
the other side end is exposed or protrudes on the back side of the backing, and a heat sensor 5
attached to the other side end of the heat conducting layer And The ultrasonic diagnostic
apparatus comprises an ultrasonic probe and an ultrasonic diagnostic apparatus body 8.
[Selected figure] Figure 1
Ultrasonic probe and ultrasonic diagnostic apparatus
[0001]
The present invention provides an ultrasonic probe capable of accurately detecting the
temperature of the transducer in a short time and connecting the ultrasonic transducer to the
ultrasonic diagnostic apparatus to provide the operator with the temperature information. The
present invention also relates to an ultrasonic diagnostic apparatus capable of controlling the
surface temperature of the object contact portion by controlling the temperature of the
transducer.
[0002]
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FIG. 7 is a schematic configuration diagram of a conventional ultrasonic probe and an ultrasonic
diagnostic apparatus using the same, wherein an ultrasonic diagnostic apparatus is configured by
the ultrasonic probe 100 and the ultrasonic diagnostic apparatus main body 106. There is.
Among them, the ultrasonic probe 100 is connected to the ultrasonic diagnostic apparatus main
body 106, and a large number of transducers 101 electrically separated and arranged in the
scanning direction A, and these transducers 101 transmit ultrasonic waves. The backing 102
provided on the back side with the transmitting side as the front side, the acoustic matching layer
104 provided on the front side of the vibrator 101 (hereinafter referred to as the object side),
and the acoustic matching layer 104 The acoustic lens 105 provided on the subject side is
provided, and a thermal sensor 103 such as a thermistor is embedded in the backing 102 (see,
for example, Patent Document 1 below).
[0003]
At the time of ultrasonic diagnosis by the ultrasonic probe 100, a pulse voltage is applied to the
vibrator 101 from the transmission voltage control unit 107 of the ultrasonic diagnostic
apparatus main body 106 via the ultrasonic probe signal line 110. An ultrasonic wave is
generated from the vibrator 101 and transmitted to a subject (not shown), and a signal obtained
by receiving a reflected wave from a biological tissue of the subject by the vibrator 101 is used
as an ultrasonic wave. The image processing unit (not shown) of the diagnostic device body 106
performs arithmetic processing to generate an image of the inside of the subject, and the image
is displayed on a monitor (not shown).
[0004]
Generally, when converting an electrical signal to mechanical energy by the vibrator 101, heat is
generated due to energy loss and the like.
At that time, as the power determined by the transmission voltage, pulse length, repetition time,
etc. from the ultrasonic diagnostic apparatus main body 106 increases, the amount of heat
generated also increases, and the surface temperature of the acoustic lens 105 as the object
contact portion Will also be high. Therefore, it is necessary to set the conditions such as the
transmission voltage so that the surface temperature of the acoustic lens 105 does not exceed
the temperature defined in IEC 60601-2-37, which is the international standard for medical
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equipment product safety test. In the case of the ultrasonic probe not having the heat sensor
103, the transmission voltage or the like is set to a lower value in consideration of the degree of
allowance for the temperature defined in IEC 60601-2-37. Therefore, when observing a deep
part of the human body, the penetration (the diagnostic depth to observe) and the sensitivity may
be insufficient.
[0005]
The ultrasonic probe 100 shown in FIG. 7 is provided with a heat sensor 103 inside the backing
102 on the back side of the transducer 101, and the acoustic sensor measures the temperature
of the transducer 101 using the heat sensor 103. It is possible to control the transmission
voltage or the like so that the surface temperature 105 does not exceed a certain value. Here, the
vibrator 101 is made of PZT (lead zirconate titanate) or the like for converting the transmission
voltage applied thereto into mechanical energy, and these vibrators 101 each have a rectangular
side surface and are electrically Are separated from each other and arranged in about 64 to 256
in the scanning direction A. The acoustic matching layer 104 is formed of one or more acoustic
matching members for efficiently transmitting ultrasonic waves to the subject. The acoustic lens
105 is in contact with the object, and in a direction perpendicular to the scanning direction A,
that is, in a direction perpendicular to the paper surface (hereinafter referred to as short axis
direction B) in order to focus the ultrasonic wave and improve resolution. It has a curvature and
is formed to be convex downward in the figure.
[0006]
When the heat sensor 103 is, for example, a thermistor, the temperature measurement unit 108
of the ultrasonic diagnostic apparatus main body 106 measures the temperature of the vibrator
101 based on the change in the electric resistance of the thermistor. Send in. The temperature
control unit 109 compares the temperature measurement result sent from the temperature
measurement unit 108 with a predetermined constant temperature, and when it is determined
that the temperature measurement result has reached a constant temperature, the transmission
voltage control unit An instruction to lower the transmission voltage etc. is given to 107. The
transmission voltage control unit 107 reduces the transmission voltage and the like according to
the instruction of the temperature control unit 109. As a result, when the temperature of the
vibrator 101 decreases, the temperature control unit 109 gives the transmission voltage control
unit 107 an instruction to restore the transmission voltage. In this way, the temperature of the
acoustic lens 105 can be controlled so as not to exceed a certain value.
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[0007]
The above-described heat sensor 103 is provided at the central portion of the vibrator 101 in the
scanning direction A, and in practice, the temperature of the central portion of the vibrator 101
is detected. When scanning by the normal electronic sector method, only the temperature
detection at the central portion is sufficient because the entire vibrator 101 is uniformly driven.
However, in the case of scanning by the linear array method in which the transducers are
sequentially switched, since the transducers 101 to be driven are always switched, the
temperature near the center may not be the highest. Therefore, to accurately measure the
maximum temperature of the transducer 101, it was necessary to detect the temperature in more
parts. Therefore, an ultrasonic probe (not shown) capable of detecting partial and local
overheating by detecting the temperature of the transducer at a plurality of locations in the
scanning direction A has been proposed (for example, not shown) (See Patent Document 2
below). JP-A-7-265315 (paragraph 0005, FIG. 3) Patent No. 33 25 712 (paragraph 0022, FIG. 1)
[0008]
However, the conventional ultrasonic probe described in Patent Document 1 and the ultrasonic
diagnostic apparatus using the same are not suitable for the operator while observing the
biological information of the object with the monitor of the ultrasonic diagnostic apparatus main
body 106. There is no means for informing the temperature information of the sample contact
portion, and the operator can not change the transmission voltage to increase the penetration or
the sensitivity while considering the temperature information. In the conventional ultrasonic
probe described in Patent Document 1, when the heat sensor 103 is a thermistor, the size is
small but the width is about 1.0 mm, and the container is made of glass, metal, or the like. It is
configured. When the thermistor is disposed near the transducer 101 inside the backing 102, the
ultrasonic wave generated from the transducer 101 is reflected by the thermal sensor 103 and is
received again by the transducer 101. Therefore, the reflection noise degrades the biological
information, and there is a problem that a thermistor can not be used as the heat sensor 103.
[0009]
Therefore, when the heat sensor 103 is sufficiently separated from the vibrator 101 and
provided at a position where the influence of the reflection noise in the backing 102 is
eliminated, the backing 102 intervenes between the vibrator 101 and the heat sensor 103. The
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temperature could not be measured accurately. That is, the material of the backing 102 is used to
increase the attenuation of ultrasonic waves, and the heat conductivity of the material is about 1
W / (m · K) which is an extremely small value, so heat is transmitted through the backing 102
However, the temperature of the vibrator 101 can not be accurately measured in a short time.
[0010]
As described above, if the temperature of the vibrator 101 can not be measured accurately in a
short time, the transmission voltage or the like must be suppressed low in consideration of the
margin. Therefore, when observing a deep part of the human body, the response of control is
delayed, which causes insufficient penetration or sensitivity, resulting in deterioration of the
image and making it difficult to see deep parts. In addition, this is also a factor that can not
suppress a rapid temperature rise that is likely to occur when scanning with the electronic sector
method in which most of the transducers 101 are constantly driven.
[0011]
On the other hand, in the conventional ultrasonic probe described in Patent Document 2, of the
transducers arranged in the scanning direction A, a thermal sensor is used to measure the
maximum temperature generated in some of the transducers. Many sensors must be installed.
When a large number of heat sensors are installed in this way, the circuit scale for measuring the
temperature from the output of each heat sensor becomes large, and it becomes necessary to
correct the variation of each heat sensor, and the circuit configuration becomes complicated. was
there. In addition, in the manufacturing process, the installation time of the heat sensor is several
times the number of heat sensors, which is several times larger than in the case of one, which
makes the workability poor and increases the mass of the ultrasonic probe. Since a space for
installing a large number of heat sensors is required, there is also a problem that the case
becomes large and the operability deteriorates.
[0012]
As mentioned above, although the problem which the conventional apparatus has was described,
when the requirements which an ultrasonic probe and an apparatus should have listed, it will
become like the following (a)-(e) term. (A) Heat to a location that does not impair the
performance of the backing (which advances and reflects from the vibrator 101 to the backing
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side and attenuates the ultrasonic wave received by the vibrator 101 to prevent deterioration of
the biological information) Provide a sensor. (B) It is necessary to accurately measure the
temperature of the vibrator in a short time. (C) In order to make the housing of the ultrasonic
probe small, it is desirable to install a thermal sensor on the back side of the backing. (D) It is
necessary to measure the maximum temperature in all the transducers with a minimum number
of thermal sensors in order to improve the workability and to make the ultrasonic probe small
and light. (E) By notifying the operator of the surface temperature value while observing the
image by the monitor, the operator can change the transmission voltage to increase penetration
and sensitivity while considering temperature information. Is desirable.
[0013]
The present invention has been made in consideration of the above-mentioned circumstances,
and its object is to minimize the performance of the backing, minimize the number of heat
sensors, and accurately attain the maximum temperature in all the vibrators in a short time, An
object of the present invention is to provide an ultrasonic probe that can be detected. Another
object of the present invention is to provide an operator or a subject with information on the
temperature of the transducer or the surface temperature of the object contact portion estimated
from the temperature of the transducer, etc. It is an object of the present invention to provide an
ultrasonic probe and an ultrasonic diagnostic apparatus capable of changing the transmission
voltage to increase penetration and sensitivity while considering the temperature information by
the operator. Another object of the present invention is to control the temperature of the vibrator
to keep the surface temperature of the acoustic lens in contact with the object within a set range,
and to make the surface temperature margin lower than before, or An object of the present
invention is to provide an ultrasonic diagnostic apparatus equipped with an ultrasonic probe
capable of setting a high transmission voltage and increasing penetration and sensitivity by
eliminating the need to consider.
[0014]
The present invention is formed in a rectangular parallelepiped shape, and the side surfaces
thereof are arranged to face each other and arranged in one dimension in a first direction, or two
dimensions in the first direction and a second direction orthogonal thereto. And a plurality of
transducers, one end surface of which is arranged in the direction orthogonal to the arrangement
direction as the ultrasonic wave generation surface and the other end surface is aligned as the
back surface, and integrated on the back surface side of the plurality of transducers An
ultrasound probe comprising a backing mounted on the back side of the transducer and
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attenuating ultrasonic waves generated from the back side of the transducer, the probe being
formed into a strip of a material having a thermal conductivity greater than that of the backing,
One side end is in contact with each of the transducers arranged in the first direction, and the
other side end is exposed or protruded to the back side of the backing. Mounted heat conduction
layer And a heat sensor attached to the other side end of the heat conduction layer, wherein the
temperature of the vibrator can be detected by the heat sensor. This configuration provides an
ultrasonic probe that can accurately detect the maximum temperature in all the transducers in a
short time with a minimum number of heat sensors without damaging the performance of the
backing.
[0015]
Further, according to the present invention, the respective sides are formed in a cuboid shape,
the side surfaces thereof are opposed to each other, and they are two-dimensionally arrayed in a
first direction and a second direction orthogonal thereto. End surfaces of the plurality of
transducers, the other end surfaces of which are aligned as the back surface, and the plurality of
transducers are integrally mounted on the back surfaces of the plurality of transducers, and are
generated from the back surface of the transducers An ultrasonic probe comprising a backing for
attenuating ultrasonic waves, wherein each of the side end portions of the transducer, which is
formed into a strip shape and made of a material having a thermal conductivity higher than that
of the backing, is substantially aligned. The respective side ends are in contact with each other
and the other side end is exposed to the back side of the backing or penetrated to the backing so
as to protrude, and the vibrator is approximately at the center of the two-dimensionally arranged
region In part A plurality of heat conduction layers arranged to cross each other; and a heat
sensor mounted at or near a portion where the other side ends of the heat conduction layers
intersect with each other, It is characterized in that detection of the temperature of This
configuration provides an ultrasonic probe that can accurately detect the maximum temperature
in all the transducers in a short time with a minimum number of heat sensors without damaging
the performance of the backing.
[0016]
In the ultrasonic probe according to the present invention, copper, aluminum, graphite, boron
nitride, carbon nanotubes, silicon carbide, beryllium oxide, magnesium oxide, magnesium oxide,
alumina, boron nitride, silicon nitride, aluminum nitride, etc. are used as the heat conduction
layer. It is characterized in that either a highly oriented PGS graphite sheet obtained by
graphitizing a polymer film or a TPG sheet produced from pyrolysis of hydrocarbon gas by a CVD
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method (chemical vapor deposition method) is used. By this configuration, it is possible to give a
thermal conductivity much higher than that of the backing, and it is possible to enhance the
ability to accurately detect the maximum temperature in all the transducers in a short time.
[0017]
In the ultrasonic probe according to the present invention, a temperature measurement unit that
detects a temperature of the transducer based on an output of the heat sensor, a temperature
display monitor that can change a numerical value or a display color, The temperature display
monitor control unit controls the temperature display monitor to change the numerical value or
the display color of the temperature display monitor according to the temperature detected by
the temperature measurement unit. With this configuration, it is possible to provide the operator
or the subject with information on the temperature of the transducer or the surface temperature
of the object contact portion estimated from the temperature of the transducer, whereby the
operator can obtain temperature information An ultrasound probe is provided that can vary the
transmission voltage to increase penetration and sensitivity while taking into account.
[0018]
Further, the present invention provides an ultrasonic probe according to any one of the above
ultrasonic transducers, a temperature measurement unit for detecting a temperature of the
transducer based on an output of the heat sensor, and ultrasonic diagnosis. An ultrasonic
diagnostic apparatus comprising: a monitor for displaying related information; and an ultrasonic
diagnostic apparatus main body including a monitor control unit for displaying the temperature
detected by the temperature measurement unit on the monitor. With this configuration, it is
possible to provide the operator or the subject with information on the temperature of the
transducer or the surface temperature of the object contact portion estimated from the
temperature of the transducer, whereby the operator can obtain temperature information An
ultrasonic diagnostic apparatus is provided that can change transmission voltage to increase
penetration and sensitivity while taking into consideration.
[0019]
Further, in the ultrasonic diagnostic apparatus according to the present invention, the ultrasonic
probe includes an acoustic lens which converges the ultrasonic wave on the ultrasonic wave
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generation surface to enhance the resolution and which becomes an object contact portion, The
temperature of the acoustic lens is controlled so that the temperature of the acoustic lens does
not exceed a predetermined value based on the output of the transmission voltage control unit
that controls the transmission voltage condition applied to the vibrator, and the ultrasonic
diagnostic apparatus main body, or And a temperature control unit for limiting the transmission
voltage of the transmission voltage control unit when the predetermined value is exceeded. With
this configuration, the temperature of the vibrator is controlled to keep the surface temperature
of the acoustic lens in contact with the object within a set range, and the margin of the surface
temperature can be made lower than in the prior art, or it is not necessary to consider. Thus, an
ultrasonic diagnostic apparatus equipped with an ultrasonic probe capable of setting a high
transmission voltage and increasing penetration and sensitivity is provided.
[0020]
Since the ultrasonic probe according to the present invention is configured as described above,
the performance of the backing is not impaired, and the maximum number of temperatures in all
the transducers is accurately measured in a short time with a minimum number of heat sensors.
It can be detected. Further, the ultrasonic diagnostic apparatus according to the present
invention uses the above-mentioned ultrasonic probe to obtain information on the temperature
of the transducer or the surface temperature of the object contact portion estimated from the
temperature of the transducer. It can be provided to the operator and the subject, whereby the
operator can change the transmission voltage to increase the penetration and sensitivity while
considering the temperature information.
[0021]
Hereinafter, the present invention will be described in detail based on preferred embodiments
shown in the drawings. First Embodiment FIG. 1 is a schematic block diagram of an ultrasonic
probe according to a first embodiment of the present invention and an ultrasonic diagnostic
apparatus using the same, and FIG. 2 is a schematic view of the present invention. FIG. 3 is a
perspective view showing the detailed configuration of the main part of the first embodiment of
the ultrasonic probe, and FIG. 3 is a detail of the main part of the first embodiment of the
ultrasonic probe according to the present invention Is a top view showing the configuration. In
FIG. 1, the ultrasound probe 1 includes a large number of transducers 2 arranged in a onedimensional manner in the scanning direction A, a backing 3 provided on the back side of the
transducers 2, and a large number of transducers 2. The heat conduction layer 4 is provided to
efficiently transfer and diffuse the heat generated by the heat sink to other predetermined sites.
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The large number of vibrators 2 are each formed in a rectangular parallelepiped shape by
piezoelectric ceramic such as PZT or a single crystal, and the rectangular parallelepipeds are
arranged in a line, so that one side face of the rectangle faces each other. When viewed from the
lateral direction (in FIG. 1, from the front side or the back side of the paper surface), the other
side faces of the rectangle are arranged in a comb-like shape. Further, as shown in FIG. 2, the
heat conduction layer 4 is formed in a strip shape, one side end of which is in contact with each
of the transducers 2 arranged in the scanning direction A, and the other side end is a backing It
is penetrated by this backing 3 so that it may be exposed or projected on the back side of 3.
[0022]
In addition, the other side end of the heat conduction layer 4, that is, the side end on the back
side, uses, for example, a thermistor, a radiation thermometer for detecting infrared rays, or the
like for detecting the temperature of the vibrator 2. A thermal sensor 5 is mounted, and an
acoustic matching layer 6 using one or more acoustic matching members for efficiently
propagating ultrasonic waves is provided on the side of the subject (not shown) of the vibrator 2;
Furthermore, on the subject side of the acoustic matching layer 6, an acoustic lens 7 having a
convex curvature with respect to the short axis direction B (see FIG. 2) is provided. Then, the
integrated vibrator 2, backing 3, heat conduction layer 4, heat sensor 5, acoustic matching layer
6, and acoustic lens 7 expose only the surface of the acoustic lens 7 on the subject side to the
casing 19. It is contained.
[0023]
Here, although the ultrasonic wave transmitted from the vibrator 2 is also propagated to the
backing 3 and the heat conduction layer 4, the ultrasonic wave propagated to the backing 3 and
the heat conduction layer 4 is unnecessary, and the present embodiment In this case, the
ultrasonic wave is prevented from returning to the vibrator 2 again by attenuating by absorption
or scattering with the backing 3. In FIG. 1, one heat conduction layer 4 is provided inside the
backing 3, but the thickness may be such that ultrasonic waves from the vibrator 2 are reflected
by the heat conduction layer 4 and do not have an adverse effect. It is important. Therefore, it is
desirable for the heat conductive layer 4 to have a thermal conductivity of at least 100 times or
more, or 100 W / (m · K) or more, as compared to the backing 3.
[0024]
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Usually, as a material of backing 3, a synthetic rubber filled with ferrite powder, or a polymer
such as epoxy resin or urethane rubber filled with a hollow body of glass or polymer in order to
increase the attenuation, such as tungsten or alumina or Although these were used for the
purpose of obtaining a material with high attenuation of ultrasonic waves, their thermal
conductivity was not considered at all. Therefore, since the thermal conductivity is about 1 W /
(m · K) which is an extremely small value, it takes time for the heat of the vibrator to be
transmitted to the heat sensor 5 on the top of the backing 3 and the heat is Because the heat is
diffused to the backing 3 and the periphery thereof, it is difficult to detect the heat of the vibrator
2 with high accuracy.
[0025]
On the other hand, the heat conduction layer 4 according to the present embodiment has a
function of transmitting the heat to the upper portion of the backing 3 in a short time before the
heat of the vibrator 2 diffuses to the backing 3 and the periphery thereof. ing. In order to
transfer the heat of the vibrator 2 to the upper part (rear side) of the backing 3 more quickly
than through the backing 3, any material having a thermal conductivity of 100 times or more
compared to the backing 3 may be used. If a material having a thermal conductivity twice or
more is used, the heat of the vibrator can be transmitted faster, whereby the temperature of the
vibrator 2 can be measured accurately by the thermal sensor 5 in a short time.
[0026]
The material of the heat conduction layer 4 is copper, aluminum, graphite, boron nitride, carbon
nanotube, silicon carbide, beryllium oxide, magnesium oxide, magnesium oxide, alumina, boron
nitride, silicon nitride, nitride having a thermal conductivity larger than that of the backing 3
Aluminum, a highly oriented PGS graphite sheet obtained by graphitizing a polymer film, a TPG
sheet produced from the decomposition of heat of hydrocarbon gas by the CVD method, etc., for
example, a material of about 1350 to 1700 W / (m · K) It is desirable to use.
[0027]
In the present embodiment, a PGS graphite sheet having a thickness of about 0.1 mm and a
thermal conductivity of 600 to 800 W / (m · K) is used as the heat conductive layer 4.
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The thermal conductivity of the thermal conductive layer 4 is defined by the ratio of the amount
of heat transferred per unit time from the vibrator 2 to the back direction of the backing 3 and
the temperature gradient in that direction. In addition, the heat conductivity of the heat
conduction layer in the scanning direction A or in the short axis direction B is vibration because
the heat of the vibrator 2 can be transmitted more accurately by minimizing the diffusion of the
heat of the vibrator 2. It is desirable that the thermal conductivity from the child 2 to the back
side of the backing 3 be lower.
[0028]
On the other hand, if the thickness of the heat conduction layer 4 is thinner than the wavelength
λ of the ultrasonic wave, problems such as the reflection of the ultrasonic wave do not occur.
Here, assuming that the sound velocity of the backing 3 is about 1400 to 1700 m / s and the
frequency of the ultrasonic wave is about 6 MHz, the wavelength λ is 0.23 mm to 0.28 mm
according to the following equation (1). It can be seen that the thickness (about 0.1 mm) of the
heat conduction layer 4 is thinner than the wavelength λ. Wavelength λ = Vb / F (1) where λ
is the wavelength, Vb is the speed of sound of the backing material, and F is the ultrasonic
frequency. That is, since the thickness of the heat conduction layer 4 may be thinner than the
wavelength of the ultrasonic wave, the thickness is not limited to 0.1 mm or less, and the
relationship of the following formula (2) is satisfied. It will be good. t <λ (2) where t is the
thickness of the heat conduction layer and λ is the wavelength.
[0029]
The heat sensor 5 is connected to the temperature measurement unit 9 of the ultrasonic
diagnostic apparatus main body 8 via a heat sensor signal line 18. The temperature measuring
unit 9 detects the temperature of the vibrator 2 based on the output signal of the heat sensor 5.
The ultrasonic diagnostic apparatus main body 8 controls the temperature of the transducer 2
based on the temperature detected by the temperature measurement unit 9 in addition to the
temperature measurement unit 9, and the surface temperature of the acoustic lens 7 does not
exceed a certain value. Thus, the temperature control unit 10 for limiting the transmission
voltage etc. and the transmission voltage control unit 11 for controlling the transmission
conditions applied to the vibrator 2 are provided, and the acoustic lens 7 is controlled by
controlling the temperature of the vibrator 2. Control the surface temperature on the subject side
of the
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[0030]
Further, the ultrasonic diagnostic apparatus main body 8 includes a monitor control unit 12 and
a monitor 13. The monitor control unit 12 controls the display contents of the monitor 13 for
displaying various setting conditions such as the biological information of the subject and the
transmission frequency, and further, the maximum temperature value of the vibrator 2 detected
by the temperature measurement unit 9 Is displayed on the monitor 13, or when the temperature
of the vibrator 2 reaches or exceeds a constant value, the monitor control unit 12 generates a
warning notification sentence, blinks of light, changes in color, etc. Information indicating that
the temperature has exceeded a predetermined value is displayed on the monitor 13 to notify the
operator of the ultrasonic diagnostic apparatus main body 8 and the subject the temperature of
the transducer 2.
[0031]
In FIGS. 2 and 3, the same reference numerals as in FIG. 1 indicate the same elements. Here, a
signal electrode layer (not shown) is provided on the back side of the substantially planar aligned
vibrator 2, and on the subject side of the substantially planar aligned vibrator 2 as well. A ground
electrode layer (not shown) is provided. The signal electrode layer is electrically connected to the
first electrode 14 having a pattern formed on polyimide, and the ground electrode layer is
electrically connected to the second electrode 15 formed of a material such as a copper foil
sheet. It is done. The first electrode 14 and the second electrode 15 are drawn from opposite
ends in the minor axis direction B and are bent in the back direction from the side surface of the
backing 3, and the ultrasonic probe signal line 16 (see FIG. 1) ) Is connected to the transmission
voltage control unit 11 (see FIG. 1) of the ultrasonic diagnostic apparatus main body 8.
[0032]
Here, each of the large number of vibrators 2 is electrically separated only in the scanning
direction A by a dividing groove A17. A strip-shaped heat conduction layer 4 is inserted in the
center of the minor axis direction B of the backing 3, and one side end of the heat conduction
layer 4 is a back surface of each transducer 2 along the scanning direction A. It is in contact with
the first electrode 14 on the side. An insulating material such as polyimide is interposed between
the first electrode 14 and the backing 3, and the first electrode 14 and the thermally conductive
layer 4 are electrically insulated. Further, the other side end of the heat conduction layer 4
protrudes above the backing 3, and the heat sensor 5 is mounted in the vicinity of the center of
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the scanning direction A among the protruding surfaces.
[0033]
The operation of the ultrasound probe 1 configured as described above will be described below
together with the operation of the ultrasound diagnostic apparatus main body 8. First, an electric
signal set in advance is supplied to the transducer 2 of the ultrasound probe 1 from the
transmission voltage control unit 11 of the ultrasound diagnostic device main body 8 via the
ultrasound probe signal line 16. The vibrator 2 converts the supplied electrical signal into
mechanical energy. At this time, heat is generated in the vibrator 2 due to energy conversion loss
and the like, and the heat is transmitted to the acoustic lens 7 and the backing 3 or the like.
[0034]
In this case, in scanning by the electronic sector method or the like in which most of the 64
transducers 2 arranged in a one-dimensional array are constantly driven, the central portion in
the scanning direction A, which is the same as the direction in which the transducers are
arranged, The central portion in the minor axis direction B perpendicular thereto is the highest
temperature. On the other hand, when scanning by the linear array method in which the
transducers are sequentially switched and scanned, the maximum temperature may be a place
away from the center of the scanning direction A because the heat generation place is switched
as needed. .
[0035]
In any of these two scanning methods, part of the heat generated from the vibrator 2 is
transmitted to the backing 3 and gradually diffused toward the back side of the backing 3 while
being transmitted inside the backing 3. Further, another part of the heat generated from the
vibrator 2 is transmitted to the back side of the backing 3 at a higher speed than the heat
transmitted through the backing 3 via the heat conduction layer 4, and the temperature change
less than that of the backing 3. Since the heat is transmitted to the back side of the backing 3, the
temperature of the vibrator 2 can be accurately detected in a short time by the heat sensor 5
provided on the back side of the backing 3.
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[0036]
In this case, since the heat conduction layer 4 is in contact with the back side of all the
transducers 2 arranged in one dimension in the scanning direction A, the maximum temperature
of the heat generated by each of the transducers 2 is the back surface of the backing 3 I can tell
you. Therefore, the temperature of the heat conduction layer 4 is detected by the heat sensor 5
installed on the back side of the backing 3, for example, using a thermistor or a radiation
thermometer, and the temperature measurement unit 9 of the ultrasonic diagnostic apparatus
main body 8 The temperature of the vibrator 2 is detected.
[0037]
The detected maximum temperature of the vibrator 2 is displayed by the monitor control unit 12
on the monitor 13 that displays biological information and control information. In addition, when
the temperature of the detected transducer 2 exceeds a certain value, the operator or subject is
informed by a sentence, blinking of light, change of color, etc. on the monitor 13 and
temperature control The unit 10 compares the temperature measurement result sent from the
temperature measurement unit 9 with a predetermined constant temperature, and when the
temperature reaches or exceeds a predetermined constant temperature, the transmission voltage
etc. Conditions such as lowering the transmission voltage supply or stopping the transmission
voltage supply are transmitted to the transmission voltage control unit 11.
[0038]
The transmission voltage control unit 11 controls the surface temperature of the acoustic lens 7
by controlling the transmission conditions, and controls so that the surface temperature of the
acoustic lens does not exceed a predetermined value. Then, when the temperature of the vibrator
2 becomes lower than or equal to a certain temperature again, the temperature control unit 10
gives the transmission voltage control unit 11 an instruction to return to the initial transmission
voltage condition. At this time, since the temperature of the vibrator 2 and the surface
temperature of the acoustic lens 7 do not coincide with each other, the surface temperature of
the acoustic lens 7 is an optimal temperature taking into consideration the difference between
the surface temperatures of the vibrator 2 and the acoustic lens 7. It can also be controlled to
[0039]
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15
As described above, according to the first embodiment, in the strip-shaped heat conductive layer
4 inserted in the backing 3, the thickness in the minor axis direction B causes the ultrasonic wave
from the vibrator 2 to be adversely affected. The performance of the backing 3 is not impaired
because it is so thin that it does not give a heat conductivity, and the thermal conductivity when
using a PGS sheet is 600 W / (m · K) or more, compared to the backing 3 Since it is about 600
times or more, heat can be accurately transmitted in a short time to a place distant from the
vibrator 2 as a heat source in a short time. The effect is obtained that one thermal sensor can
measure the maximum temperature of all the transducers.
[0040]
In addition, since only one thermal sensor is required to detect the maximum temperature of all
the transducers 2, the installation of the thermal sensor 5 is facilitated, the workability is
improved, and the volume of the housing 19 of the ultrasonic probe 1 is increased. It is possible
to provide a small, lightweight, easy-to-operate ultrasonic probe that can be reduced.
Furthermore, by controlling the temperature of the vibrator 2, the acoustic power does not
exceed the value defined by the US FDA guideline 510 (k) until the temperature of the vibrator 2
becomes a certain temperature or higher. Since the transmission voltage can be increased,
penetration and sensitivity can be improved.
[0041]
In addition, by controlling the temperature of the vibrator 2, when the temperature becomes
equal to or higher than a certain temperature, the transmission power is controlled by
automatically changing the transmission voltage or transmission interval or interrupting the
operation. The surface temperature of the acoustic lens 7 with which the subject comes in
contact can be lowered, and the operator can consider the temperature information by providing
the information on the surface temperature of the subject contact portion to the operator or the
subject. The transmission voltage can be changed to increase penetration and sensitivity.
[0042]
Further, by keeping the temperature of the vibrator 2 constant, the temperature change applied
to the backing 3, the vibrator 2, the acoustic matching layer 6, the acoustic lens 7 and the like
can be made gentle and can be reduced. It is possible to prevent material deterioration, peeling of
the adhesive between the backing 3, the vibrator 2, the acoustic matching layer 6 and the
acoustic lens 7, and the like, and to suppress the transmission of ultrasonic waves and the
03-05-2019
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deterioration of the reception sensitivity.
[0043]
At the time of temperature control of the vibrator 2, the correction value considered to be
optimum from the temperature value of the vibrator 2 is subtracted to calculate the surface
temperature of the portion of the acoustic lens 7 in contact with the object, and this surface
temperature is calculated. It may be displayed or controlled.
The heat sensor 5 is preferably attached to the central portion in the scanning direction A and
the short axis direction B on the back side of the backing 3, but may be attached to the end in the
scanning direction A. It is good also as a place drawn out further to the upper part from the back
part of.
Further, the heat sensor 5 is not limited to a thermistor or a radiation thermometer, and may be
any means capable of detecting a temperature. Further, although the heat conduction layer 4 is
in direct contact with the surface of the first electrode 14 on which the insulating layer is
provided, for example, the positive electrode layer (not shown) of the vibrator 2 and the first
electrode 14 have short lengths. In the configuration where the heat conduction layer 4 is
electrically connected near the end in the axial direction B and the heat conduction layer 4 is in
direct contact with the vibrator 2, the positive electrode layer (not shown) of the vibrator 2 and
the heat conduction layer 4 It is also possible to realize a configuration in which an insulating
adhesive such as an epoxy resin is thinly provided between them, or an insulating layer such as a
polyimide film is provided between the vibrator 2 and the backing 3. Needless to say, when the
transmission voltage is changed, the control of the reception gain is automatically or adjusted by
the operator according to the transmission voltage.
[0044]
Second Embodiment Next, a second embodiment of the present invention will be described using
FIGS. 4 and 5. FIG. 4 is a perspective view showing a detailed configuration of the second
embodiment of the ultrasonic probe according to the present invention, and FIG. 5 is a second
embodiment of the ultrasonic probe according to the present invention It is a top view which
shows a detailed structure. The configuration and operation of the ultrasonic diagnostic
apparatus main body to which the ultrasonic probe according to the second embodiment is
03-05-2019
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connected are the same as those of the first embodiment shown in FIG. I omit it.
[0045]
In FIG. 4 and FIG. 5, the vibrator 20 is divided in a grid shape in the scanning direction A and the
scanning direction B by the dividing groove A 24 and the dividing groove B 23. A signal electrode
layer (not shown) is provided on the back side of the vibrator 20, and a ground electrode layer
(not shown) is provided on the subject (not shown) side of the vibrator 20. There is. The signal
electrode layer is electrically connected to the first electrode 21. The first electrode 21 is formed
of a flexible substrate having a pattern formed on polyimide. A portion of the first electrode 21
corresponding to the dividing groove B23 of the vibrator 20 is partially cut or not cut, and a
pattern connected to the signal electrode layer of the vibrator 20 is cut. Without being pulled out
to the back side of the backing.
[0046]
On the other hand, the grounding electrode layer is electrically connected to the second electrode
22 which is a material such as a copper foil sheet. A portion of the second electrode 22
corresponding to the dividing groove A24 for dividing the vibrator 20 in the scanning direction A
is partially cut, but a portion corresponding to the dividing groove B23 for dividing the vibrator
20 in the scanning direction B Is partially cut or not cut, and serves as a common ground of the
vibrator 20. The first electrode 21 and the second electrode 22 are drawn from opposite ends in
the scanning direction B, bent upward from the side surface of the backing and drawn in parallel,
and the ultrasonic probe signal line 16 (FIG. 1) The transmission voltage control unit 11 (see FIG.
1) of the ultrasonic diagnostic apparatus main body 8 (see FIG. 1) is connected via the reference).
[0047]
A cross-shaped heat conductive layer 26 is formed on the backing 25 so as to intersect at the
central portions in the scanning direction A and the scanning direction B, and the heat
conductive layer 26 is in contact with the first electrode 21. At this time, the surface of the first
electrode 21 in contact with the backing is electrically insulated from the heat conduction layer
26 by an insulating material such as polyimide of the first electrode 21. That is, the heat
conduction layer 26 is electrically separated from the adjacent vibrator 20 which is electrically
03-05-2019
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separated in the scanning direction A and the scanning direction B by the division grooves A 24
and the division grooves B 23.
[0048]
As in the first embodiment, the heat conductive layer 26 is formed in a strip shape of a material
having a thermal conductivity higher than that of the backing 25, and one side end portion
thereof is arranged in the scanning direction A and the scanning direction B Each of the vibrators
20 is in contact with an insulating material such as polyimide through the backing 25 so that the
other side end projects to the back side of the backing 25, and in the scanning direction A and
the scanning direction B A heat sensor 5 is attached near each center. Further, on the subject side
of the vibrator 20, an acoustic matching layer 6 composed of one or more acoustic matching
members and an acoustic lens 27 are formed. The acoustic lens 27 has a flat shape, but may
have a convex curvature, for example, in one or both of the scanning direction A and the
scanning direction B in order to facilitate the convergence of the ultrasonic wave.
[0049]
The heat conductive layer 26 may be made of a material having a thermal conductivity of 100
times or more compared to the backing 25. However, when a material having a thermal
conductivity of 600 times or more is used, the heat of the vibrator is Further, the heat can be
transmitted faster, and the heat sensor 5 can measure the temperature of the vibrator 20
accurately in a short time.
[0050]
The material of the heat conductive layer 26 is copper, aluminum, graphite, boron nitride, carbon
nanotube, silicon carbide, beryllium oxide, magnesium oxide, magnesium oxide, alumina, boron
nitride, silicon nitride, aluminum nitride, which is larger than the thermal conductivity of the
backing 25 High thermal conductivity such as a highly oriented PGS graphite sheet obtained by
graphitizing a polymer film or a TPG sheet produced from the decomposition of heat of
hydrocarbon gas by a CVD method, for example, 1350 to 1700 W / (m · K It is desirable to use a
certain degree of material.
[0051]
Regarding the operation of the second embodiment of the ultrasonic probe configured as
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described above, the operation of the ultrasonic diagnostic apparatus main body 8 (see FIG. 1) to
which the ultrasonic probe is connected will be described below. Explain to.
First, a transmission voltage set in advance is applied to the vibrator 20 from the transmission
voltage control unit 11 of the ultrasonic diagnostic apparatus main body 8 via the ultrasonic
probe signal line 16.
The vibrator 20 converts an electrical signal into mechanical energy. At this time, heat is
generated in the vibrator 20 due to energy conversion loss and the like, and the heat is
transmitted in each direction such as the acoustic lens 27 and the backing 25.
[0052]
Here, in the matrix-type ultrasonic probe having a total of 25 transducers 20 in 5 rows × 5
columns in the scanning direction A and the scanning direction B, the 25 transducers 20 are
controlled to perform scanning. The cross-sectional information of the living body of the subject
in the direction A and the scanning direction B is two-dimensionally scanned. In the method of
sequentially switching and scanning the vibrator 20, the highest temperature may be a place
away from the center because the place where the heat is generated is switched as needed.
Further, the location may be, for example, a location that is not only biased from the center in the
scanning direction A to one end, but is also a location that is biased from the center in the
scanning direction B to one end.
[0053]
The heat of a part of the vibrator 20 is transmitted to the backing 25 and is gradually diffused
toward the back side of the backing 25 while being transmitted inside the backing 25. The heat
of the vibrator 20 is earlier in time than transmitted through the backing 25, the heat is
transmitted to the back side of the backing 25 through the heat conductive layer 26, and the
temperature change is less than that through the backing 25. Since the heat of 20 can be
transmitted to the heat sensor 5 on the back side of the backing 25, temperature detection can
be performed with high accuracy and in a short time. At this time, the heat conduction layer 26 is
provided along the scanning direction A and the scanning direction B, respectively, and the heat
conduction layer 26 is two-dimensionally arranged, and the centers of the scanning direction A
and the scanning direction B are provided. Since the heat conductive layer 26 is provided on the
03-05-2019
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back side of all the vibrators 20 in each part, the heat conduction layer 26 is not only one in the
scanning direction A or the scanning direction B, but also in each of the scanning direction A and
the scanning direction B The maximum temperature of the heat generated at 20 can be
transmitted to the back side of the backing 25.
[0054]
At that time, the temperature of the heat conduction layer 26 is detected by the thermal sensor 5
such as a thermistor or a radiation thermometer installed on the back side of the backing 25, and
the temperature measurement unit 9 of the ultrasonic diagnostic apparatus main body 8 , To
detect the temperature. The detected maximum temperature of the vibrator 20 is displayed by
the monitor control unit 12 on the monitor 13 that displays biological information and control
information. If the detected temperature of the vibrator 20 exceeds a certain value, the operator
or subject is notified by a sentence, blinking of light, change in color, etc., on the monitor 13, and
the temperature control unit 10, when it is judged that the temperature measurement result sent
from the temperature measurement unit 9 has reached or exceeded a predetermined constant
temperature as compared with a predetermined constant temperature, a constant time, a
transmission voltage, etc. To the transmission voltage control unit, such as lowering the
transmission voltage or stopping the transmission voltage supply.
[0055]
The transmission voltage control unit 11 controls the surface temperature of the acoustic lens 27
by controlling the transmission condition, and controls so that the surface temperature of the
acoustic lens does not exceed a predetermined value. Then, when the temperature of the vibrator
20 falls below a certain temperature again, the temperature control unit 10 instructs the
transmission voltage control unit 11 to apply the first transmission voltage condition. At this
time, since the temperature of the vibrator 20 and the surface temperature of the acoustic lens
27 do not match, the temperature may be controlled in consideration of the difference between
the surface temperature of the vibrator 20 and the surface temperature of the acoustic lens 27.
[0056]
Thus, according to the second embodiment, the thermally conductive layer 26 intersecting at
each central portion in the scanning direction A and the scanning direction B is provided in the
backing 25 where the heat is concentrated and the temperature is increased, The conductive
layer 26 has such a thickness that the heat conductive layer 26 does not adversely affect the
03-05-2019
21
reflection of the ultrasonic waves from the vibrator 20, so that the heat conduction of the heat
conductive layer 26 is not impaired. For example, when using a PGS sheet, the rate is 600 W / (m
· K) or more, which is about 600 times or more than the thermal conductivity of the backing 25,
so Because heat can be transferred with high precision in a short time, heat of the vibrator 20
can be accurately measured in a short time, and the maximum temperature of the vibrator 20 in
the scanning direction A and the scanning direction B can be the back side of the backing 25 Can
be transmitted to There are cormorants effect further, in one thermal sensor 5 has the effect of
measuring the maximum temperature of the.
[0057]
Since the number of heat sensors 5 can be reduced, the installation of the heat sensors 5 is
facilitated, the workability is improved, and the volume of the casing 19 (see FIG. 1) of the
ultrasonic probe can be reduced. It is possible to provide a compact, lightweight, easy-to-operate
ultrasonic probe.
Also, by controlling the temperature of the vibrator 20, the acoustic power exceeds the value
determined by the US FDA guidelines 510 (k) until the temperature of the vibrator 20 reaches a
certain temperature or higher. The penetration and sensitivity can be enhanced because it can be
enhanced within the limits.
[0058]
Also, by controlling the temperature of the vibrator 20, when the temperature reaches a certain
temperature or more, the transmission power is controlled by automatically changing the
transmission voltage or transmission interval or interrupting the operation. The surface
temperature of the acoustic lens 27 in contact with the subject can be lowered, and the operator
can consider the temperature information by providing the information on the surface
temperature of the subject contact portion to the operator or the subject. This has the effect of
being able to provide an ultrasound probe that can change the transmission voltage to increase
penetration and sensitivity.
[0059]
Further, by keeping the temperature of the vibrator 20 constant, the temperature change applied
to the backing 25, the vibrator 20, the acoustic matching layer 6, the acoustic lens 27 and the
like can be gradually and less, so the expansion and contraction of the material There is also an
effect that material deterioration, peeling of the adhesive between the backing 25, the vibrator
03-05-2019
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20, the acoustic matching layer 6, and the acoustic lens 27 can be prevented, and transmission of
ultrasonic waves and reduction in reception sensitivity can be suppressed. .
[0060]
The thermally conductive layer 26 shown in FIG. 5 is formed of two strip members orthogonal to
each other at the centers of the backing 25 in the scanning direction A and the scanning
direction B, but connecting the four apexes of the backing 25 It may be disposed in the diagonal
direction, and may be formed by two plate-like members that obliquely intersect at the centers of
the scanning direction A and the scanning direction B.
Alternatively, a plurality of plate members may be arranged in the scanning direction A and the
scanning direction B of the backing 25, and a plurality of plate members may be arranged in the
diagonal direction connecting the four apexes. It is also good.
With this configuration, the detection point of the maximum temperature of the vibrator is
increased, so that the detection accuracy of the maximum temperature of the vibrator can be
further enhanced.
[0061]
Third Embodiment Next, a third embodiment of the present invention will be described. FIG. 6 is
a schematic block diagram of an ultrasonic probe according to a third embodiment of the present
invention and an ultrasonic diagnostic apparatus using the same, and in FIG. 6 showing the first
embodiment, The same elements are denoted by the same reference numerals and the
description thereof is omitted. Here, in the ultrasonic probe 30, the vibrator 2, the backing 3, the
heat conduction layer 4, the heat sensor 5, the acoustic matching layer 6, and the acoustic lens 7
are integrated to form an object of the acoustic lens 7 (shown in FIG. Only the surface on the side
is exposed and stored in the inside of a housing 31 formed of plastic. Further, a temperature
measurement unit 32 and a temperature display monitor control unit 33 are provided in the
inside of the housing 31, and a temperature display monitor 34 is attached to a portion visible
from the outside of the housing 31. Among them, the temperature measuring unit 32 detects the
temperature of the vibrator 2 based on the output of the heat sensor 5, and the display monitor
control unit 33 responds to the temperature information of the vibrator 2 detected by the
temperature measuring unit 32. The temperature display monitor 34 displays the temperature
03-05-2019
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information of the vibrator 2. The temperature display monitor 34 is a light emitting element
such as a light emitting diode capable of numerically displaying the temperature of the vibrator
or emitting multiple colors.
[0062]
The ultrasonic diagnostic apparatus main body 35 includes a temperature control unit 37, a
monitor control unit 38, a transmission voltage control unit 39, and a monitor 40. Among them,
the temperature control unit 37 is connected to the temperature measurement unit 32 in the
ultrasonic probe 30 via the heat sensor signal line 36, and the temperature control unit 37 is
connected to the transducer 2 based on the temperature signal of the temperature measurement
unit 32. The temperature is controlled to limit the transmission voltage etc. so that the surface
temperature of the acoustic lens 7 does not exceed a certain value. The transmission voltage
control unit 39 controls transmission conditions applied to the vibrator 2. The monitor control
unit 38 controls the display contents of the monitor 40 for displaying various setting conditions
such as the biological information of the subject and the transmission frequency, and further
monitors the maximum temperature value of the vibrator 2 detected by the temperature
measurement unit 32. When the temperature of the vibrator 2 exceeds a fixed value, the monitor
control unit 38 displays information indicating that the temperature of the fixed value has been
exceeded by a sentence, blinking of light, change of color, etc. By displaying on the monitor 40,
the operator of the ultrasonic diagnostic apparatus main body 35 or the subject is notified of the
temperature of the transducer 2.
[0063]
The operation of the third embodiment configured as described above will be described below.
First, the transmission voltage control unit 39 of the ultrasonic diagnostic apparatus main body
35 applies a transmission voltage set in advance to the transducer 2 of the ultrasonic probe 30
via the ultrasonic probe signal line 16. . Thus, the vibrator 2 converts the electrical signal into
mechanical energy. At this time, heat is generated in the vibrator 2 due to energy conversion loss
and the like. This heat is transmitted to the acoustic lens 7 and the backing 3 or the like. For
example, in the case of scanning by the electronic sector method in which most of 64 vibrators 2
are driven at all times, central portions of scanning direction A in which the vibrators are arrayed
and short axis direction B (not shown) perpendicular thereto. Is the highest temperature, but in
the case of scanning by the linear array scanning method in which the transducers are
sequentially switched and scanned, the highest temperature may be a distant place from the
center because the heat generation location is switched at any time. The heat of a part of the
03-05-2019
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vibrator 2 is transmitted to the backing 3 and is gradually diffused toward the back side of the
backing 3 while being transmitted inside the backing 3. The heat of the vibrator 2 is transferred
to the back side of the backing 3 via the heat conduction layer 4 faster in time than the transfer
speed of the backing 3 and with less temperature change. Thus, temperature detection can be
performed accurately and in a short time. At this time, the heat conduction layer 4 is provided
along the scanning direction A, and the heat conduction layer 4 is provided on the back side of
all the transducers 2 arranged in a one-dimensional manner. The conductive layer 4 can transmit
the maximum temperature of the heat generated by each vibrator 2 to the back side of the
backing 3. Then, the temperature of the heat conduction layer 4 is detected by the heat sensor 5
installed on the back side of the backing 3, for example, a thermistor or a radiation thermometer,
and the temperature measuring unit 32 in the ultrasonic probe 30 , The temperature is detected.
[0064]
The detected maximum temperature of the transducer 2 is transmitted to the temperature
display monitor control unit 33 in the ultrasonic probe 30, and it may be determined in advance
by the user to correspond to the numerical value information of the temperature or the
numerical value of the temperature. The light of the set color is displayed on the temperature
display monitor 34 provided in the housing 31 of the ultrasonic probe 30. The detected
maximum temperature information of the transducer 2 is also transmitted to the monitor control
unit 38 of the ultrasonic diagnostic apparatus main body 35, and the monitor control unit 38
detects the detected vibration on the monitor 40 that displays the biological information and
control information. Display the maximum temperature of child 2. If the detected temperature of
the transducer 2 exceeds a certain value, the operator or the subject may be notified by a
sentence, blinking of light, change of color, or the like on the monitor 40.
[0065]
Further, the temperature control unit 37 of the ultrasonic diagnostic apparatus main body 35 has
a constant temperature or a constant temperature as compared with a fixed temperature
determined by the temperature measurement result sent from the temperature measurement
unit 32. When the transmission voltage control unit 39 determines that the transmission voltage
is exceeded, the transmission voltage control unit 39 is notified of conditions such as lowering
the transmission voltage or stopping the transmission voltage supply for a certain period of time.
The transmission voltage control unit 39 controls the surface temperature of the acoustic lens 7
so as not to exceed a certain temperature by controlling the transmission conditions. Then, when
the temperature of the transducer 2 becomes lower than or equal to the constant temperature
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again, the temperature control unit 37 of the ultrasonic diagnostic apparatus main body 35
instructs the transmission voltage control unit 39 to apply the first transmission voltage
condition. . At this time, since the temperature of the vibrator 2 and the surface temperature of
the acoustic lens 7 do not match, the temperature may be controlled in consideration of the
difference between the surface temperature of the vibrator 2 and the surface temperature of the
acoustic lens 7.
[0066]
As described above, according to the third embodiment, since the temperature measurement unit
32, the temperature display monitor control unit 33, and the temperature display monitor 34 are
provided in the ultrasonic probe 30, the ultrasonic diagnostic apparatus It is possible to provide
the operator and the subject with surface temperature information of the acoustic lens 7 as the
object contact portion while minimizing the increase in the circuit of the main body 35. In
addition, when the ultrasound probe 30 is handled, the screen of the monitor 40 of the
ultrasound diagnostic apparatus main body 35 can not be seen, or if it is seen, the screen is far
from the other, but it is closer The light of the temperature display monitor 34 provided in the
sound wave probe 30 also has the effect of being able to easily obtain information on the surface
temperature.
[0067]
The ultrasonic probe according to the present invention is formed in a strip shape of a material
having a thermal conductivity higher than that of the backing, one side end of which is in contact
with each of the transducers, and the other side end is of the backing A thermally conductive
layer which is exposed to the back side or penetrated to the backing so as to protrude, and a
thermal sensor attached to the other side end of the thermally conductive layer As an ultrasonic
diagnostic device that can accurately detect the maximum temperature in all the transducers in a
short time with a minimum number of heat sensors without damaging the performance of the
backing. It can be used.
[0068]
In the ultrasonic diagnostic apparatus according to the present invention, the ultrasonic probe
according to the present invention, a temperature measurement unit that detects the temperature
of the transducer based on the output of the thermal sensor, and a monitor that displays
information related to ultrasonic diagnosis. And an ultrasonic diagnostic apparatus main body
including a monitor control unit that causes the monitor to display the temperature detected by
the temperature measurement unit, the object contact unit estimated from the temperature of the
03-05-2019
26
transducer or the temperature of the transducer The ultrasonic diagnostic apparatus can provide
the operator and the subject with information on the surface temperature of the body, etc.,
thereby changing the transmission voltage and increasing the penetration and sensitivity while
considering the temperature information. Can be provided.
[0069]
The first embodiment of the ultrasound probe according to the present invention and the
schematic configuration diagram of the ultrasound diagnostic apparatus using the same The
details of the main parts of the first embodiment of the ultrasound probe according to the
present invention 3 is a perspective view showing a configuration of the ultrasonic probe
according to the present invention, a top view showing a detailed configuration of the main part
of the first embodiment of the ultrasonic probe according to the second embodiment of the
present invention The perspective view showing the detailed configuration The top view showing
the detailed configuration of the second embodiment of the ultrasonic probe according to the
present invention The third embodiment of the ultrasonic probe according to the present
invention Schematic configuration diagram of ultrasonic diagnostic apparatus used Conventional
ultrasonic probe and schematic configuration diagram of ultrasonic diagnostic apparatus using
the same
Explanation of sign
[0070]
Reference Signs List 1, 30, 100 ultrasonic probe 2, 20, 101 transducer 3, 25, 102 backing 4, 26
heat conduction layer 5, 103 heat sensor 6, 104 acoustic matching layer 7, 27, 105 acoustic lens
8, 35 , 106 ultrasonic diagnostic apparatus body 9, 32, 108 temperature measurement unit 10,
37, 109 temperature control unit 11, 39, 107 transmission voltage control unit 12, 38 monitor
control unit 13, 40 monitor 14, 21 first electrode 15, 22 second electrode 16, 110 ultrasonic
probe signal line 17, 24 split groove A 18 thermal sensor signal line 19, 31 housing 23 split
groove B 33 temperature display monitor control unit 34 temperature display monitor
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