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JPH0216899

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DESCRIPTION JPH0216899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic wave generator that generates ultrasonic waves using electromagnetic induction.
(Prior Art) As an apparatus for crushing a calculus in a subject, there is one disclosed in Japanese
Patent Application Laid-Open No. 62-0498 / 13. FIG. 6 shows a cross section of an ultrasonic
applicator used in this device. The ultrasonic applicator 1 shown in the same figure has a
concave hole of a predetermined shape in the center and has a diameter of 10 cm and a concave
vibrator 2 formed on the right, and a back face of the concave vibrator 2. And a backing material
3 uniformly bonded. The ultrasonic probe 4 is disposed such that the transmission / reception
wavefront (ultrasound array) 4a is at the same position as that of the ultrasonic transmission /
reception wavefront of the concave vibrator 2 or a curved surface or a ridge thereof. Here, 5 is a
water bag, and 6 is a subject. And such an ultrasonic applicator 1 is used in the state supported
by the support member shown by 7. (Problems to be Solved by the Invention) However, in the
illustrated imitation, since the shock wave is generated by the vibrator 2, there is a disadvantage
that the energy of the shock wave is small. Also, since the focusing point of the shock wave is
fixed, the operation to bring the focusing point to the object to be crushed (calculus) must be
performed by moving the support member 7 vertically and horizontally. Furthermore, since the
water bag 5 needs to be always in contact with the subject 6 within the range of this movement,
there is a need to use a large one corresponding to the water bag 5, and the problem of
increasing the weight and size was there. An object of the present invention is to provide an
ultrasonic wave generator which is large in ultrasonic energy, small in size, light in weight and
improved in operability. [Configuration of the Invention] (Means for Solving the Problems) The
configuration of the present invention for achieving the above object comprises a plurality of
concentrically arranged coils and a focusing point forming distance of generated ultrasonic
waves. Phase control means for controlling the phase of the ultrasonic wave generation signal
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supplied to each of the coils to adjust the frequency, and the coils are arranged opposite to the
coils while being concentrically divided and supplied to the coils And a vibrating member capable
of vibrating by electromagnetic induction based on an ultrasonic wave generation signal. In
addition, based on a plurality of concentrically arranged coils, coordinate value calculation means
for calculating coordinate values of the object to be crushed in the object, and focusing points of
ultrasonic waves on the object to be crushed based on the calculated coordinate values. Phase
control means for controlling the phase of the ultrasonic wave generation signal supplied to each
coil so as to match each other, and the coils are arranged in a circular pattern while being
opposed to the coils, and supplied to the coils And a vibrating member that can be vibrated by
electromagnetic induction based on an ultrasonic wave generation signal.
Operation) The operation of the present invention will be described in which the above-described
configurations are provided in one box. The ultrasonic wave generator according to claim 1
controls the phase of an ultrasonic wave generation signal supplied to each of a plurality of
concentrically arranged coils, and forms a focusing point forming distance of ultrasonic waves
generated from the vibrating member. I'm adjusting. In the ultrasonic generator according to the
second aspect of the present invention, the focusing point of the ultrasonic wave is made to
coincide with the object to be crushed based on the coordinate value of the object to be crushed
in the subject extracted by the coordinate value sieving means. The phases of the ultrasonic wave
generation signals supplied to the respective coils are respectively controlled to adjust the
focusing point formation distance of the ultrasonic waves generated from the vibrating member.
The present invention will be described below with reference to the drawings. The present
embodiment will be described on the assumption that the ultrasonic wave generator is applied to
a shock wave treatment apparatus. FIG. 1 is a block diagram showing the configuration of a
shock wave treatment apparatus as one embodiment. The shock wave treatment device (Jll, a
small number of concentrically arranged coils 8 shown in the figure) and the coils disposed in
close contact with the coils via a thin insulator (not shown). The vibration member 9 is divided
into concentric circles and can be picked up by electromagnetic induction based on the
ultrasonic wave generation signal supplied to each coil, and the vibration member 9 is affixed on
the ultrasonic wave transmission direction (direction to the arrow) side. Ultra-high wave to the
right with soft synthetic resin sheets 1 to 10 and ultrasonic probe 17 for collecting tomographic
image information in the object provided at the center of the concentric coil. A pulser 11
comprising pulsers 11a to 11f provided corresponding to each of the approgator 1B and the
plurality of "piles" 8 and transmitting an ultrasonic wave generation signal (pulse signal) to each
of the Phase control means Delay group 12 consisting of delays 12a to 12 "for setting the delay
time of the ultrasonic wave generation signal sent out from Paluli r and Y 111 according to the
control signal from 6 and the ultrasonic wave generated from the vibration unit +49 Phase
control means 16 for performing phase control of the ultrasonic wave generation signal supplied
to each of the coils, and timing generator 13 for setting the timing of the ultrasonic wave
generation signal to be transmitted J in order to adjust the focusing point formation distance. A
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coordinate value calculation means 15 for calculating the coordinate value of the object to be
crushed in the object, ie, the distance from the object surface of the object to be crushed, and a
display unit 1/1 for displaying a tomographic image obtained from the ultrasonic probe 17 And
1 are configured. In addition, in the present embodiment, the phase control means d3 is supplied
for each coil so as to make the focusing point of the ultrasonic waves coincide with the object to
be crushed based on the coordinate values calculated by the coordinate value calculation means
15. Each phase of the sound wave generation signal is controlled.
In the figure, 1 / la is a transmission region of ultrasonic waves transmitted / received by the
ultrasonic probe 17, and 14b is a focusing point marker indicating a focusing point of the
ultrasonic waves transmitted from the coil. The focusing point marker 14b is changed and
displayed corresponding to the perspective adjustment of the focusing point forming distance of
the ultrasonic wave. Next, the detailed configuration of the ultrasonic applicator 18 will be
described. FIG. 2 is a cross-sectional view of an ultrasonic applicator having the above-described
configuration. The ultrasonic applicator 18 shown in the figure includes a backing member 20
having a predetermined curvature and having a concave cross section, and energization of an
ultrasonic wave generation signal disposed in a ring-shaped concave portion 20a formed on the
backing member 20. By the coil 8 capable of forming the focusing point F1, an ultrasonic probe
17 disposed at the center of the coil 8 and collecting tomographic image information of a region
including the focusing point F1, and an opening of the ring-shaped four portion 20a And the
synthetic resin sheet 10 attached to the ultrasonic wave transmission side of the vibration part 9)
rA 9 and having characteristics approximate to the acoustic characteristics of water. The water
tank 21 is provided with a characteristic similar to the acoustic characteristic of water provided
on the ultrasonic wave transmitting wavefront side of the backing member 20. As shown in FIG.
3, the coil 8 wound concentrically is divided into six coils 8a to 8f in this embodiment. The both
ends of each coil 8a to 8f are electrically connected to the output end of the pulser 11a to 111f
(refer to FIG. 1), and the pulser 11a to 11f is connected to each coil 8a to 8f. An ultrasound
generation signal is provided. The vibrating member 9 is composed of partial vibrating members
9a to 9 divided in the same concentric shape corresponding to the coils 8a to 8f. Further, in each
of the partial vibration portions jA 9 a to 9 f, by sticking of the synthetic resin sheet 10 described
above, one vibration is not transmitted to the other. That is, when ultrasonic wave generation
signals having different phases are supplied to the coils 8a to 8 respectively, reverse currents are
generated in the corresponding partial vibration units +; A 9a to 9f by the electromagnetic
induction action of the coils. The magnetic forces generated in opposite directions between each
of the coils 8a to 8f and the partial vibration members 98 to 9f cause the partial vibration
members to be separated from each other, thereby generating an acoustic wave. Next, the
operation of the embodiment apparatus configured as described above will be described mainly
on the assumption that the kidney stone 22 in the kidney W423 shown in FIG. 5 is broken.
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First, the water bag 21 provided in the ultrasonic applicator 18 is placed on the subject P. Then,
a tomogram of the subject P including the focusing point F1 collected from the ultrasonic probe
17 is displayed on the screen of the display unit 14. In the stage where the kidney image 23 'is
displayed, the kidney stone image 22' existing therein is searched. In this case, the ultrasonic
transmission areas 14 and 8 and the focusing point marker 14b are displayed on the display unit
14 at fixed positions. The tomogram of the subject P displayed in real time changes its display
region as the ultrasonic applicator 18 moves. Then, at the stage where the renal stone image 22
'is depicted in the tomographic image 23', the ultrasound applicator 18 is further adjusted to
adjust the renal stone image 22 'and the focal point marker 1 / 1.1. J matches with a: Operate. In
this case, when the focusing point marker 1 / 1b and the object to be crushed (renal stone) can
not be matched, the ultrasound application is performed so that the focusing point marker 14b is
positioned vertically above the object 22 to be crushed. Secure the rack 18 Then, by operating a
coordinate value calculation start switch (not shown), the distance from the surface of the object
to the object to be crushed is calculated by the coordinate value calculation means 15. This
utilizes that the material to be crushed provides a significantly stronger echo wave as compared
to other organs. The calculation of the distance from the surface of the object to the object to be
crushed 22 may be performed manually by manual operation while the image of the object to be
crushed displayed on the display unit 14 is displayed. The phase control means 16 causes each
coil to match the focal point of the ultrasonic wave to the object to be crushed 22 based on the
coordinate value calculated by the coordinate value calculation means 15, that is, the distance
from the object surface to the object 22 to be crushed. The phase of the ultrasonic wave
generation signal supplied for each time is controlled by making the delay amount of each of the
delays 12a to 12f of the delay group 12 smaller. As a result, in the present embodiment, the
focusing point “1” is moved to the focusing point F3 that coincides with the object 22 to be
crushed. Then, when the operator operates a pulse generation switch (not shown), a control
signal is sent to the pulsar group 11. In this case, an ultrasonic wave generation signal is
transmitted from the repulsor group 11 to the coil 8 so that the vibrating member 9 has a
position corresponding to the ultrasonic wave of strong energy corresponding to the focal point
marker 14 b (corresponding to the focal point F3). To the kidney stone 22 present in the Such
shock wave transmission is required several times (P: it is possible to destroy the whole of the
string 1522 in this way. 3 ° Thus, in the apparatus of this embodiment, electromagnetic
induction is used. It is possible to transmit ultrasonic waves having strong energy.
As a result, even if the material to be crushed is at the back of the subject and the attenuation of
ultrasonic waves is significant, the material to be crushed can be easily crushed. In addition, since
the distance at which the ultrasonic focusing point is formed can be adjusted, it is possible to use
a compact and simple ice bag with light eV's <> IM composition. Therefore, the operability can be
improved, and the tomogram of the subject obtained through the U3 acoustic wave probe 17 can
be sharper as compared with the conventional one. The present invention is not limited to the
embodiments described above, and various modifications can be made within the scope of the
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invention. For example, in the above embodiment, the coil is shown to be concave in cross section
along the backing member with a predetermined curvature and concave in cross section, but it is
not limited to this and is flat with the backing member etc. Even within the scope of the gist. Also
in this case, the same effects as those of the above-described embodiment can be obtained, and
the manufacture can be further facilitated. [Effects of the Invention] As described above,
according to the present invention, it is possible to provide an ultrasonic wave generator which is
large in size, small in size and light in weight and whose operability is improved.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an ultrasonic wave generator according to an embodiment of
the present invention applied to a shock wave treatment apparatus, and FIG. 2 is a coil, a
vibration member, an ultrasonic probe, etc. shown in FIG. 3 is an explanatory view showing a
detailed configuration of a coil, FIG. 4 is an explanatory view showing a detailed configuration of
a vibrating member, and FIG. 5 is an operation of an apparatus according to an embodiment of
the present invention Explanatory drawing, FIG. 6 is sectional drawing which shows a structure
of the conventional ultrasonic applicator.
8 (8a to 8f) ... coil, 9 (9a to 9f> ... vibrating member, 15 ... coordinate value calculation means, 16
... phase control means.
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