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JPS62268536

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DESCRIPTION JPS62268536
[0001]
The present invention relates to the improvement of an acoustic lens for an ultrasonic probe
used in the field of medical diagnostic equipment and the like. (Prior Art) Various methods are
known for focusing in the direction of ultrasonic wave propagation in an ultrasonic probe, but
there is a method using an acoustic lens as one of the representative methods. In the case of this
method, as a method of increasing the resolution in the short distance region, a means of
reducing the aperture of the acoustic lens itself and reducing the curvature of the lens is used.
However, in order to make the bore smaller, it is necessary to change the vibrator (ceramic) itself,
so that as long as this means is used, the commonality with the vibrator used for other probes is
lost. I had to prepare for (Problems to be solved by the invention) However, losing the
commonality with the oscillator used for other probes directly causes the efficiency on the V core
to deteriorate, so the oscillator used for other probes There is a strong demand for a solution that
can maintain the commonality and make the aperture of the lens itself smaller. The present
invention has been made in view of this situation. [Configuration of the Invention] (Means for
Solving the Problems) According to the configuration of the present invention for speeding up
the object, the diameter of the ultrasonic wave passing portion of the acoustic lens in the
ultrasonic probe head is at least the diameter of the imaging motor. The gap is set to be smaller
than the above, and a sound absorbing material is provided on the outer peripheral portion of the
ultrasonic wave passing portion and on the portion facing the transducer. And, the function of
the present invention based on this configuration is to set the effective aperture of the acoustic
lens for the ultrasonic probe head by the sound absorbing material provided on the outer
peripheral portion of the ultrasonic wave passing portion of the acoustic lens. It is necessary for
the point to reduce the lens diameter substantially. The present invention will be described in
detail below based on an embodiment shown in the drawings. In FIG. 1, PH is a head of an
ultrasonic probe, which comprises an acoustic lens matching / 2 transducer 3 and a sound
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absorbing material 4, but the performance of the matching layer 2 / vibrator 3 and the sound
absorbing material 4 as a configuration of a probe head. The structural material, dimensions and
the like are the same as those used in the known head of this type. The acoustic lens 1 according
to the present invention has a diameter smaller than at least the diameter of the vibrator 3 and a
lens base 1a having substantially the same diameter as the diameter of the probe head PH (or the
vibrator 3) as shown in FIG. It is formed of a lens portion having d (> 1b which becomes an
effective aperture). In this case, it is desirable that the material of the lens base 1a and the
material of the lens portion 1b be the same material from the viewpoint of manufacturing.
Reference numeral 5 denotes a ring-shaped sound absorbing material made of, for example,
ferrite rubber, which is provided in close contact with the lower surface of the lens base 1a and
the outer peripheral surface 1C of the lens portion 1b. Set up to follow. This is because the
ultrasonic wave generated by the vibrator 3 passes through the outer peripheral portion of the
lens portion 1b and is directed to the subject (not shown), and the irregular ultrasonic wave from
the subject is the outer periphery of the lens portion 1b It is for preventing passage to the
oscillator 3 through the part. Therefore, the material and thickness of the sound absorbing
material 5 are determined to be suitable for this purpose. As described above, since the diameter
d of the lens portion 1b is set to be at least smaller than the diameter of the vibrator 3 and the
periphery thereof is covered with the ring-shaped sound absorbing material 5, the outer
peripheral portion of the lens portion 1b The ultrasonic waves (or reflected waves) passing
through to the subject and passing from the subject and the subject to the outer peripheral part
of the portion 1b and going to the vibrator 3 are all the sound absorbing materials. As a result,
only the portion of the lens portion 1b or N acts as a lens in the probe head PH. That is, it
becomes possible to obtain the same power and result as in the case of the probe head using the
small-aperture acoustic lens in the conventional system and the vibrator adapted to this.
Although one embodiment has been described above, the present invention is not limited to this,
and various modifications can be made without departing from the scope of the invention. For
example, the materials of the lens base 1a and the lens portion 1b may be different materials.
Therefore, in this case, it is also possible to configure the lens base 1a and the lens portion 1b in
different parts. Further, as shown in FIG. 3, the lens portion 1b may be formed in a cylindrical
shape with a small diameter, and the sound absorbing material 5 may be adhered to the entire
outer periphery thereof. Furthermore, as shown in FIG. 4, it is also possible to apply the present
invention to a probe head having an array v, and in this case, the lens portion 1b is a cylindrical
(cylindrical surface) lens and the sound absorbing material 5 Is a two-water member with a
substantially triangular cross section. [Effects of the Invention] As described above, when using
the present invention, a probe using a small-aperture acoustic lens in the conventional method
and a vibrator or the like compatible with the same without changing at least the shape and
diameter of the imaging actuator. This produces an effect that the same function and result as
those of the head can be obtained.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a schematic sectional view of an ultrasonic probe head equipped with an acoustic lens
according to an embodiment of the present invention, FIG. 2 is a perspective view of the acoustic
lens excluding a sound absorbing material, and FIGS. It is a schematic sectional drawing which
shows the other Example of invention.
1 ··· Acoustic lens 2 ··· Matching layer 3 ··· Vibrator 4 ··· Sound absorbing material 5 ··· Ring-shaped
sound absorbing material PH ··· Ultrasonic probe head agent Patent Attorney Law Norio 'PH B to
U-7'-) FIG.
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