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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic horn for breaking up tissue or living things that are no longer needed.
2. Description of the Related Art Ultrasonic horns that use mechanical vibration of ultrasonic
waves to crush and emulsify tissue or living things that are no longer needed are used in various
types of surgery and basic research on cell engineering.
As shown in FIG. 3, this ultrasonic horn is connected at a connection portion (12) by an
appropriate method such as an oscillator as an ultrasonic vibration source and a screw or the
like, and the ultrasonic vibration of the oscillator acts as the action of the horn tip. It transmits
and amplifies to the part (13).
The shape of the ultrasonic horn is reduced in diameter at the tip end portion in order to expand
the vibration amplitude of the vibrator.
Generally, as the area ratio between the small diameter portion and the large diameter portion is
larger, the amplification factor of the amplitude is increased, the amplitude is increased at the tip
of the horn, and the tissue crushing force is increased.
Unwanted cells and tissues contain water, and high-amplitude ultrasonic vibrations in the
crushed and emulsified liquid generate bubbles called cavitation, which further increases tissue
Although cavitation works as a plus to increase the crush force, the horn itself is also broken to
cause a problem of so-called erosion. As a method of preventing this erosion, methods such as
bonding a ceramic plate to the tip, nitriding the surface, etc. have been tried, but it is not possible
to prevent erosion completely even though the durability time can be extended. It is possible.
Therefore, when erosion occurs in the conventional horn, it takes a lot of time and money to
replace the entire horn or to recover the horn once for recovery, bonding the ceramic plate,
performing surface treatment and returning it. .
An object of the present invention is to provide an ultrasonic horn for solving such a
In order to achieve the above object, an ultrasonic horn according to the present invention is
replaceable by making an end of an ultrasonic horn for breaking up a living tissue by ultrasonic
vibration detachable. At the same time, the structural feature is that only the material of that
portion is made of a material with high erosion resistance.
The attachment and detachment of the horn tip of the ultrasonic horn according to the present
invention can be made detachable with, for example, a screw. In this case, only the tip can be
easily replaced with a jig such as a spanner.
In addition, a method of caulking using the elasticity of metal may be used, and the method is not
particularly limited.
The material of the horn tip is not particularly limited as long as it has high hardness and
toughness. However, precipitation hardened stainless steel such as SUS630 and SUS631,
stainless steel which has been work hardened or hardened, chromium, molybdenum, tungsten,
nickel It is preferable to use a cemented carbide alloy such as a sintered alloy of boride
containing iron and the like, a metal coated with a ceramic by thermal spraying or the like.
In addition, it is necessary to adjust the resonance frequency by adjusting the length of the horn
tip so as not to affect the resonance, or adjusting the length so as to resonate with the tip
BEST MODE FOR CARRYING OUT THE INVENTION The ultrasonic horn of the present invention
can be attached and detached at the time of deterioration due to erosion or the like, so that it is
not necessary to replace the entire horn, and it is possible to reuse it only by replacing the tip.
In addition, since erosion occurs particularly at the tip surface, the life of the horn can be
extended without changing the oscillation characteristics by replacing only a small portion of the
tip with a special material having high erosion resistance.
Thus, according to the present invention, by using a special material with high erosion resistance
only at the tip and making it detachable, the cost at the time of horn replacement can be reduced
and the life can be extended, so that it is extremely possible. It is effective for
described in detail based on the embodiment shown in FIG.
FIG. 1 shows an ultrasonic horn according to the present invention, wherein (1) is a horn body
and (2) is a horn tip.
FIG. 2 is a detailed view of the horn tip.
In general, the material of the ultrasonic horn is a corrosion resistant metal such as titanium
alloy, aluminum alloy, stainless steel, etc., which has toughness suitable for ultrasonic vibration
with a speed of sound of about 1000 to 6000 m / sec and low density. Composed of materials.
The most preferred material is titanium alloy. However, the titanium alloy has an HV hardness of
about 200, whereas that of SUS630 is about 500 and that of cemented carbide is about 1000 to
2000. Erosion resistance is said to improve substantially by the square of hardness. In this
example, SUS630 was used for the horn tip (2), and a titanium alloy was used for the horn body
(1). Further, the mounting and demounting portion was cut out with a male screw at the end of
the horn and a female screw at the horn main body (1), and a spanner seat (3) was provided for
each to enable removal by the spanner.
When the ultrasonic horn of the present invention and the conventional ultrasonic horn are
oscillated in water under the same conditions, the occurrence of erosion is clearly less in the
ultrasonic horn of the present invention, and if the tip is replaced, The horn body could be reused
as it is.
As described above, in the ultrasonic horn according to the present invention, the tip of the horn
is made of a material with high erosion resistance, and moreover, the life thereof can be extended
compared to the conventional horn because it is detachable. In addition, the replacement part has
an unconventional feature of low cost.
Brief description of the drawings
1 is an overall view illustrating an ultrasonic horn according to the present invention.
2 is a detailed view of the tip of the ultrasonic horn according to the present invention.
3 is an overall view showing a conventional ultrasonic horn.
Explanation of sign
1, 11 horn body 2 horn tip 3 spanner seat 12 connection portion 13 action portion
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