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JPS63154169

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DESCRIPTION JPS63154169
[0001]
TECHNICAL FIELD The present invention relates to a mechanical sector scanning ultrasonic
probe used in an ultrasonic diagnostic apparatus or the like for obtaining a tomogram of a living
body using ultrasonic waves. In the prior art mechanical sector scanning type ultrasonic probe,
one or more transducers are attached to a base, and the base is rotated in one direction through
a power transmission mechanism by driving a motor, Alternatively, it can be rotated back and
forth to obtain a sector type ultrasonic tomographic image. Hereinafter, a conventional
mechanical sector scanning ultrasonic probe will be described with reference to FIG. In the fourth
@, 51 is a pedestal formed in a triangular prism, 52 is a transducer attached to each surface of
pedestal 51, 53 is a pulley attached to shaft 54 of pedestal 51, 55 is a motor, 56 is motor 55 The
pulley 58 is attached to the output shaft 57 of the belt, and 58 is a belt hung on the pulleys 53
and 56. Next, the operation of the above conventional example will be described. By driving the
motor 55, the pedestal 51 is rotated via the pulley 56, the belt 58 and the pulley 53, and the
ultrasonic beam from the transducer 52 is scanned in a sector shape. In the above-described
conventional example, three transducers are attached to all the pedestals 51 of the transducer s
2 and ultrasonic beams are superimposed to obtain a tomographic image, but two transducers
52 or only one transducer 52 may be attached. In the prior art, in either case, the transducer 52
uses an acoustic lens on the front surface of the piezoelectric vibrator or the piezoelectric
vibrator itself is formed in a concave shape in order to provide an ultrasonic focusing effect. The
focal length is determined by the shape of the acoustic lens or the piezoelectric vibrator.
Problems to be solved by the invention However, in the configuration of the prior art as
described above, all transducers 52 having the same focusing distance were used even when the
plurality of transducers 52 were attached to the pedestal 51 . For this reason, in order to obtain
tomographic images with good resolution of diagnostic regions at different distances, it is
necessary to prepare a plurality of ultrasonic probes, which is inconvenient for diagnosis.
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Therefore, the present invention is intended to provide an ultrasonic probe capable of obtaining
tomographic images with good resolution of diagnostic regions of different distances by one unit,
and facilitating diagnosis. . The means for solving the problems and the technical means of the
present invention for solving the above problems comprise a rotatably driven pedestal and a
focal point of an ultrasonic beam attached to the pedestal and emitted. And a plurality of
different transducers.
Operation The effects of the above technical means are as follows. That is, by selectively using a
plurality of transducers, it is possible to obtain a tomogram with good resolution of diagnostic
regions of different distances. Examples of the present invention will be described below with
reference to the drawings. First, a first embodiment of the present invention will be described.
FIG. 1 is a cross-sectional view showing an ultrasonic probe in a first embodiment of the present
invention. In FIG. 1, 1 is a pedestal formed in a triangular prism shape, and 2.3.4 is a transducer
attached to the hole 5 in the attachment formed on each side of the pedestal 1. The shaft 6 of the
pedestal 1 is linked to a motor (not shown) by means of a power transmission mechanism
consisting of a pulley and a belt as in the prior art, or a power transmission mechanism using
gears. Each transducer 2.3.4 has a concave-shaped acoustic lens 8 attached to the front surface
of the planar piezoelectric vibrator 7, and the mounting of the pedestal 1 by the back load
material 9 attached to the back of the piezoelectric vibrator 7 It is attached to the hole 5. The
acoustic lens 8 of each transducer 2.3.4 is set to have different focusing distances (curvatures). In
general, each acoustic lens 8 uses a material close to an object (human body) or acoustic
impedance of water, 1.5 × 10 6 N-S-S-3. Also, assuming that the sound velocity of the acoustic
lens 8 is VL and the sound velocity of water is VW, the acoustic lens 8 having a concave shape as
described above is used in the case of VL> VW, and in the case of V L (V W The lens 8 has a
convex shape. FIG. 2 is a block diagram showing a circuit for selecting each transducer 2.3.4. In
FIG. 2, 7 is a piezoelectric vibrator of each transducer 2.3.4, 10 is a transformer, 11 is a
changeover switch, 12 is a changeover switch, and 13 is a diode. And each transducer 2.3.4 can
be selectively operated by the operation of the changeover switches 12 and 11. Next, the
operation of the above embodiment will be described. As described above, by selectively
operating Q) the transducer 2.3.4 by the selection circuit and rotating the base 1 by driving the
motor, a sector type fault having a high resolution of a diagnostic area of a desired distance. You
can get an image. Next, a second embodiment of the present invention will be described. FIG. 3 is
a cross-sectional view showing a second embodiment of the present invention. As shown in FIG.
3, in the present embodiment, each transformer 2.3.4 is designed to focus the ultrasonic beam
using a concave-shaped piezoelectric transducer 7 without using an acoustic lens. The focusing
distance of each transducer 2.3.4 from the piezoelectric vibrator 7 is set to be different, and the
configuration of the pond is the same as that of the first embodiment.
As described above, according to the present invention, since a plurality of transducers with
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different focusing points of ultrasonic beams emitted to a rotatably driven pedestal are attached,
a plurality of transducers can be selectively selected. By using it, it is possible to obtain a
tomogram with good resolution of diagnostic regions of different distances, and to facilitate
diagnosis.
[0002]
Brief description of the drawings
[0003]
1 and 2 show an ultrasonic probe according to a first embodiment of the present invention, FIG.
1 is a cross-sectional view, FIG. 2 is a block diagram of a selection circuit, and FIG. FIG. 4 is a
cross sectional view showing two embodiments, and FIG. 4 is a perspective view showing a
conventional ultrasonic probe.
1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · acoustic
lens, 9 · · · · · · · · · Material. Name of Agent Attorney Nakao Toshio Other 1 person Figure 1
Shirasu Figure 3 Figure 4 b
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