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JPH0698388

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DESCRIPTION JPH0698388
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
high pressure resistant hydrophone and, more particularly, to a high pressure resistant
hydrophone for measuring shock waves from a medical stone crusher.
[0002]
BACKGROUND OF THE INVENTION In recent years, with the development of medical devices, it
has been carried out, for example, that a calculus formed in the kidney is crushed by an external
shock wave, which is known as a calculus crushing apparatus. Generally, the ultrasound from the
ultrasound generator is focused (focused) on the calculus to generate a shock wave. The shock
wave in such a thing is said to be about 1000 atmospheres or more at the time of calculus
fracture. And, high pressure resistant hydrophones have been proposed as measures of these
shock wave levels and the like to clarify causation of calculus fracture.
[0003]
2. Description of the Related Art FIG. 8 is a view for explaining an outline of a proposed example
of a high pressure resistant hydrophone. The high pressure resistant hydrophone is formed by
accommodating the polymeric piezoelectric material 2 in the cylindrical container 1. The
cylindrical container 1 is formed, for example, by cutting the inside from the other end surface
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side of the metal rod, and the one end surface side 3 is used as a sound pressure detection
surface. The polymeric piezoelectric material is made of, for example, PVDF (polyvinylidene
fluoride), and excitation electrodes (not shown) are formed on both main surfaces. Then, the
main surface of the polymeric piezoelectric material 2 is disposed to face the one end surface
side 3 of the cylindrical container 1, and the metal plate 5 pressed by the conductive spring 4 is
provided on the other main surface. That is, the polymer piezoelectric material 2 is pressed and
held on the one end face side 3 of the metal container by the elasticity of the spring 4 and at the
same time the electrode is led out, which is a so-called pressure bonding method. In addition, the
insulating material 6 is provided in the inner periphery of a metal container, and the other end
surface side is obstruct | occluded by the cover body (not shown). However, the spring 4 is
electrically led to the outside by a terminal provided on the lid (not shown). In such a thing, since
the polymeric piezoelectric material 2 is used as the piezoelectric material, the piezoelectric
material is less likely to be damaged by a shock wave as compared with a solid body such as
quartz or PZT (lead zirconate titanate). In addition, since no bonding agent is used in the
electrode lead-out portion, there is an effect such as no breakage at that portion.
[0004]
[Problems of the prior art] However, with the above configuration, there is a problem that the
reception level changes every time a shock wave arrives due to the holding of the polymeric
piezoelectric material 2 by the pressure bonding method, and stable measurement can not be
performed. The That is, the electrical connection between the excitation electrode provided on
both main surfaces of the polymeric piezoelectric material 2 and the one end face side 3 of the
cylindrical container 2 sandwiching this and the metal plate 5 is an elastic connection structure
Therefore, there is a problem that the connection strength is not stabilized due to the shock
wave, and as a result, the reception level changes. Moreover, the sound pressure detection
surface of the one end surface side 3 is formed by cutting the inside from the other end surface
side of the metal rod. Therefore, it is difficult to make the thickness and the flatness even, and
there is also a problem that the adhesion with the polymeric piezoelectric material 2 is uneven
and the reception level is different.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a high pressure
resistant hydrophone which stabilizes the reception level.
[0006]
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According to the present invention, an integral polymer piezoelectric material in which a lead-out
portion extends from an excitation portion is applied as a piezoelectric material, and a front
surface of the excitation portion is in close contact with one end side of the cylindrical container.
A damper is provided on the rear surface of the part, and the lead-out part is bent to lead out
from the rear end side of the damper as a basic solution.
Hereinafter, one embodiment of the present invention will be described.
[0007]
FIG. 1 is a cross-sectional view of a high pressure resistant hydrophone for explaining an
embodiment based on the solution means of the present invention. The high pressure resistant
hydrophone is generally composed of the polymeric piezoelectric material 10, the damper 11,
the cylindrical container 12, and the relay tool 13. As shown in FIG. 2 (plan view), the polymer
piezoelectric material 10 is integrally formed by extending the lead-out portions 15 (ab) from
both end sides of the excitation portion 14. The excitation part 14 has an excitation electrode 16
(ab) in the central part of both main surfaces as a substantially circular shape. The lead portion
15 (ab) has a width smaller than the diameter of the excitation portion 14, and has a lead
electrode 17 (ab) extended from the excitation electrode 16. The damper 11 is made of a rubberlike elastic material and is provided on the rear surface of the polymeric piezoelectric material
10. That is, the excitation portion 14 of the polymeric piezoelectric material 10 is used as the
main surface, the lead portion 15 (ab) is bent to be adhered to the side, and the tip end of the
lead portion 15 is extended to the rear end side of the damper 11. The integrated piezoelectric
polymer material 10 and the damper 11 are used as a piezoelectric unit 18. The cylindrical
container 12 includes a container body 19, a connector 20, and an extension 21. These are made
of stainless steel except for the connector 20 (resin). The container main body 19 has a small
hole 22 (about 3.5 mm) on one end surface side, and the other end surface side is an opening
surface. The small holes 22 are closed by a protective plate 23 having a flat plate shape. Then, in
the container body 19, the front surface (excitation portion 14) of the piezoelectric unit 18 is
brought into contact with the protective plate 23 and accommodated, and the filler 24 is
embedded between the container body 19. In this example, the protective plate 23 is bonded in
advance to the front surface of the piezoelectric unit 18 (excitation unit 14). Then, with the
adhesive (filler) filled in the container main body 19, the piezoelectric unit 18 is inserted from
the opening surface side, and the hole on the one end surface side is closed by the protective
plate 23 and accommodated. The connector 20 is made of a convex resin material having a hole
at the center. Then, the convex tip end side is inserted into the opening surface of the container
main body 19. The extension portion 21 is open at both ends, one end is connected to the
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connector 20, and the other end is sealed by a resin lid. Incidentally, the overall length of the
cylindrical container 12 is 50 mm, and the diameter is 5 mm. The relay tool 13 has a
substantially V-shaped cross section, and a conductor such as a metal tape is formed in both
groove portions (see FIG. 4). Further, at one end side, the lead-out portion 15 (lead-out electrode
17) of the polymeric piezoelectric material 10 is connected by a conductive adhesive or the like.
The other end side is connected to each line of the coaxial cable.
Then, the filler 24 is embedded in the gap between the relay tool 13 and the extension portion
21 as described above. The coaxial cable is led out of the hole of the lid 25.
[0008]
With such a configuration, electrical lead-out from the excitation part 14 (excitation electrode
16) is reliably performed by the extraction part 15 (extraction electrode 17), compared to the
pressure bonding method of the prior art example. The strength of the electrical connection does
not change and the reception level does not change. And, since the lead-out portion 15 extends
to the rear end side of the damper 11 and is connected to the relay tool 13, that is, since it is
connected at a position separated from the one end surface side (sound pressure detection
surface) Prevent destruction at the connection without acting. Further, in this embodiment, a
protective plate 23 is provided on the front surface of the polymeric piezoelectric material 10 to
close the small holes 22 of the container main body 19. Then, the protective plate 23 is
interposed to receive the shock wave. Therefore, it is easier to make the thickness and flatness of
the protective plate 23 constant than in the conventional example where a hole is formed in the
metal rod to make the sound pressure detection surface, and the adhesion with the polymer
piezoelectric material 10 is made favorable and received You can make the level the same. And,
since the filler 24 is embedded between the container main body 19 and the piezoelectric unit
18, shock waves are absorbed to prevent breakage of the polymer piezoelectric material 10 such
as the lead portion 15 and to provide a waterproof effect. Play.
[0009]
[Other Matters] In the above embodiment, one end face of the container body 19 is closed by the
protective plate 23 provided on the front surface of the piezoelectric unit 18, but the protective
plate 23 may be provided in advance. For example, as shown in FIG. 5, the protective plate 23 is
fitted and caulked to a step provided at the tip of the container main body 19, and after filling the
filler 24 such as silicon in the gap, the piezoelectric unit 18 is accommodated. You may do so.
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And although the piezoelectric unit 18 was fixed by the filler 24, it may use not only this but
other fixing means using a screw etc., for example. Also, the cylindrical container 12 is divided
into the container body 19 and the extension part 21 and connected by the connector 20, from
the viewpoint of operations such as making it easy to fix the piezoelectric unit 18 on one end
surface side, Basically, it can be configured without using the connector 20. Further, although the
lead-out portion and the line of the coaxial cable are connected using the relay tool 13, the leadout portion and the coaxial cable may be directly connected without using the relay tool 13. For
example, as shown in FIG. 6, the lead-out portion 15 of the piezoelectric unit 18 and each line of
the coaxial cable 27 are directly connected on the rear end side of the damper 11 by a
conductive adhesive (not shown). Then, the cylindrical holder 28 (see FIG. 7) may be fitted to the
rear of the damper 11 and the rear end of the damper 11 may be pressed by the pressure spring
29. In addition, the code | symbol 30 in a figure is a back pressing tool, 31 is a fixing material
which served as waterproofing, such as a silicone. In this case, an adhesive may or may not be
interposed between the polymeric piezoelectric material 10 and the damper 11 and one end face
side of the cylindrical container as necessary. Although the width of the lead-out portion 15 in
the polymeric piezoelectric material 10 is smaller than the diameter of the excitation portion 14,
it may be equal to or larger than the diameter of the excitation portion 14 in order to increase
the strength of the bent portion. Further, although the cylindrical container 12 is closed by the
protective plate 23, it may be basically integrally formed as shown in the conventional example.
The present invention enables various modifications as described above. The main point is that
the polymer piezoelectric material 10 in which the lead-out portion 15 extends from the
excitation portion 14 is applied to the cylindrical container in front of the excitation portion 14
Abuts to one end face side (sound pressure detection face) 12 and arranges the damper 11 on
the rear face side of the excitation part 14 and extends the lead-out part 15 from the rear end
side of the damper 11 to eliminate the adverse effect by the shock wave The basic technical idea
of the present invention is one that is constructed under such a thought and belongs to the
technical scope of the present invention.
[0010]
According to the present invention, an integral polymeric piezoelectric material in which the
lead-out portion extends from the excitation portion is applied as a piezoelectric material, and the
front surface of the excitation portion is in close contact with one end of the cylindrical
container. The damper is provided on the rear surface of the excitation unit, and the lead-out
portion is bent to lead out from the rear end side of the damper. Therefore, it is possible to
provide a high pressure withstanding hydrophone that stabilizes the reception level.
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