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DESCRIPTION JPH0737379

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DESCRIPTION JPH0737379
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic transducer, and more particularly to an ultrasonic transducer in which the shape of
the electrode plate is improved.
[0002]
2. Description of the Related Art Ultrasonic transducers are used in ultrasonic generators such as
ultrasonic surgical instruments or ultrasonic machines. For example, as shown in FIG. 3, the
ultrasonic surgical instrument 70 includes a main body case 22 having a grip portion which an
operator grips, and an ultrasonic transducer 50 provided inside the main body case 22 via a
resin insulation tube 24. And a horn (not shown) connected to the tip of the ultrasonic transducer
50. With this configuration, the amplitude generated from the ultrasonic transducer is amplified
by the horn, and the living tissue is It is crushed. In addition, an irrigation pipe 20 for supplying a
perfusion solution to the tip of the ultrasonic surgical instrument is provided outside the main
body case 22.
[0003]
A conventional ultrasonic transducer 50 used in an ultrasonic surgical instrument holds
piezoelectric elements 28a and 28b juxtaposed, and holds the piezoelectric elements 28a and
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28b via insulators 14a and 14b. Electrode plates provided on both ends of the pair of metal
blocks 12a and 12b and the piezoelectric elements 28a and 28b by supplying current to the
piezoelectric elements 28a and 28b and arranged between the piezoelectric elements 28a and
28b 36a, 36b, 36c. Further, as shown in FIG. 4, the electrode plate 36 is soldered to a circular
portion 60 in contact with the piezoelectric elements 28a and 28b, and a lead wire 18 extending
from the circular portion 60 and supplying an electric current from the outside at its tip. And a
lead portion 62.
[0004]
In general, in the ultrasonic surgical instrument 70, after the lead wire 18 is soldered to the lead
portion 62 of the electrode plate 36 of the ultrasonic transducer 50, the lead portion 62 of the
electrode plate 36 is piezoelectric elements 28a, 28b and It bends so that metal block 12a, 12b
may not be contacted, and it is formed by inserting the ultrasonic transducer | vibrator 50 in
main body case 22. As shown in FIG. The lead portion 62 of the electrode plate 36 used in the
conventional ultrasonic transducer 50 has a short length, as shown in FIG.
[0005]
However, since the lead portion of the electrode plate is short, the above-described conventional
ultrasonic vibrator prevents the lead portion and the lead wire from contacting the piezoelectric
element and the metal block. In order to achieve this, the bent position of the lead portion has to
be in the vicinity of the tip of the lead portion separated from the contact portion with the
piezoelectric element. For this reason, the outer diameter of the case of the ultrasonic surgical
instrument becomes large, and the operator's ease of operation and the intraoperative operability
are inferior. In particular, in the case of eye surgery, it is difficult to perform delicate surgery
because the distance between the operator's hand holding the ultrasonic surgical instrument and
the patient's face becomes short.
[0006]
Further, in order to reduce the outer diameter of the case, it is necessary to coat the piezoelectric
element with silicon rubber so that the electrode plate may be in contact, which is complicated
and has a limit in reducing the outer diameter of the case. there were.
[0007]
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Furthermore, since the electrode plate and the lead wire are soldered in the vicinity of the
piezoelectric element, the connection is severely damaged by vibration.
[0008]
The present invention has been made in view of the above problems, and an object thereof is to
provide an ultrasonic transducer for reducing the outer diameter of the holding portion of an
ultrasonic wave generator.
[0009]
SUMMARY OF THE INVENTION In order to solve the above problems, the ultrasonic transducer
according to the present invention is an ultrasonic vibration incorporated in the operator's grip
in an ultrasonic wave generator. In the element, at least two or more piezoelectric elements
arranged in parallel, a pair of metal blocks sandwiching the piezoelectric element with an
insulator interposed therebetween, and a current supplied to the piezoelectric element to be
inserted between the piezoelectric elements. And a plurality of electrode plates attached to both
ends of the juxtaposed piezoelectric element, the electrode plate extending from a portion in
contact with the piezoelectric element to supply an external current Characterized in that the
part is longer than the longitudinal direction of the metal block close to the current source
[0010]
In the ultrasonic transducer according to the present invention, the lead portion of the electrode
plate is covered with an insulating material.
[0011]
In the ultrasonic transducer of the present invention configured as described above, since the
length of the lead portion of the electrode plate is made longer than the longitudinal direction of
the metal block, the lead wire connected to the lead portion is a metal block There is no contact.
For this reason, a lead wire can be arrange | positioned behind a metal block, and the case outer
diameter of the ultrasonic wave generator which incorporates an ultrasonic transducer | vibrator
in the holding part can be made thin.
[0012]
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Further, by making the length of the lead portion of the electrode plate longer than the
longitudinal direction of the metal block, the lead portion of the electrode plate can be soldered
to the lead wire at a distance from the piezoelectric element.
For this reason, damage to the soldered connection portion due to vibration is small.
Furthermore, since the lead portion of the electrode plate is coated with an insulating material,
there is no need to coat the piezoelectric element with silicon rubber or the like, and the bending
position of the lead portion can be made near the circular portion of the piezoelectric element
contact portion.
Therefore, the outer diameter of the case of the ultrasonic wave generator including the
ultrasonic transducer in its holding portion can be further reduced.
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
present invention will be described below based on the drawings.
[0014]
FIG. 1 is a cross-sectional view for explaining the structure of an ultrasonic surgical instrument
incorporating an ultrasonic transducer according to the present invention, and FIG. 2 shows an
ultrasonic transducer according to the present invention. A front view of the electrode plate used
is shown.
[0015]
As shown in FIG. 1, the ultrasonic surgical instrument 30 comprises an ultrasonic transducer
provided inside the main body case 22 via a resin insulation tube 24 and a main body case 22
having a grip portion which the operator holds. 10 and a horn (not shown) connected to the tip
of the ultrasonic transducer 10. With this configuration, the amplitude generated from the
ultrasonic transducer is amplified by the horn, and the living tissue at the tip of the horn Is
crushed.
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Further, on the outside of the main body case 22, an irrigation pipe 20 for supplying a perfusion
fluid to the tip is provided.
In addition, a cap 32 is provided at the rear of the ultrasonic surgical instrument 30.
[0016]
The ultrasonic transducer 10 of the present invention used in the ultrasonic surgical instrument
30 comprises piezoelectric elements 28a, 28b made of piezoelectric ceramic juxtaposed, and the
piezoelectric elements 28a, 28b as insulators 14a, A pair of metal blocks 12a and 12b
sandwiching them via 14b and both ends of the piezoelectric elements 28a and 28b which are
inserted between the piezoelectric elements 28a and 28b by supplying current to the
piezoelectric elements 28a and 28b The electrode plate 16 has a circular portion 40 in contact
with the piezoelectric elements 28a and 28b, as shown in FIG. 2, and a tip end of the circular
portion 40 extending from the circular portion 40. Consists of a lead 18 which supplies current
from the outside and a lead 42 which is soldered
[0017]
Usually, after soldering the lead wire 18 to the lead portion 42 of the electrode plate 16 of the
ultrasonic transducer 10, the ultrasonic surgical instrument 30 bends the lead portion 42 of the
electrode plate 16 to form the body case 22. It is formed by inserting the ultrasonic transducer
10 inside.
The ultrasonic vibrator 10 of this embodiment is a bolted vibrator, and hollow bolts provided in
the metal block 12a are insulators 14a and 14b, piezoelectric elements 28a and 28b, and
electrode plates 16a, 16b and 16c. And bolted to the hollow portion of the metal block 12b.
In addition, a hollow tube 26 is provided in the ultrasonic transducer 10 in order to aspirate the
fragments and the perfusion fluid in operation. In the case of the present embodiment, the
number of electrode plates 16 is three, but normally six are used. Further, although only two lead
portions are shown in FIG. 1, another lead portion is provided in front of FIG. 1 and a lead wire
18 is joined.
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[0018]
The feature of the present invention is that the lead portion 42 of the electrode plate 16 is longer
than the longitudinal length of the metal block 12b. Accordingly, the lead wire 18 connected to
the lead portion 42 does not come in contact with the metal block 12 b and the piezoelectric
elements 28 a and 28 b. For this reason, the lead wire 18 can be arrange | positioned behind the
metal block 12b, and the outer diameter of the main body case 22 of the ultrasonic surgical
instrument 30 which incorporates the ultrasonic transducer | vibrator 10 in the holding part can
be made thin.
[0019]
Further, by making the length of the lead portion 42 of the electrode plate 16 longer than the
longitudinal direction of the metal block 12b, the lead portion 42 of the electrode plate 16 and
the lead wire 18 can be separated from each other at a distance from the piezoelectric elements
28a and 28b. It can be soldered. Therefore, damage to the soldered joint due to vibration can be
reduced.
[0020]
Further, even if the soldered joint portion is damaged, the soldered damaged portion can be
repaired only by removing the cap 32.
[0021]
Furthermore, the feature of the present invention is that the lead portion 42 of the electrode
plate 16 is coated with an insulating material 34.
For example, the lead portion 42 may be resin-molded. As a result, the bending position of the
lead portion 42 can be made near the circular portion 40 in contact with the piezoelectric
elements 28a and 28b without coating the piezoelectric elements 28a and 28b with silicon
rubber or the like. For this reason, the outer diameter of the main body case 22 of the ultrasonic
surgical instrument 30 in which the ultrasonic transducer 10 is built in the holding portion can
be further narrowed.
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[0022]
According to the above configuration, the grasping portion of the ultrasonic surgical instrument
for performing eye surgery in particular can be made thinner, and the distance between the
operator's hand holding the ultrasonic surgical instrument and the patient's face can be reduced.
There is a margin. This makes it possible to perform subtle surgery.
[0023]
Although the ultrasonic surgical instrument using the ultrasonic transducer according to the
present invention has been described in detail in the present embodiment, the ultrasonic
transducer according to the present invention may be used in general for an apparatus that
generates ultrasonic waves. it can. In particular, the ultrasonic transducer according to the
present invention is useful in reducing the size and thickness of the device.
[0024]
As described above, in the ultrasonic transducer according to the present invention, the lead wire
connected to the lead portion by making the length of the lead portion of the electrode plate
longer than the longitudinal direction of the metal block. Does not touch the metal block. For this
reason, a lead wire can be arrange | positioned behind a metal block, and the case outer diameter
of the ultrasonic wave generator which incorporates an ultrasonic transducer | vibrator in the
holding part can be made thin.
[0025]
Further, by making the length of the lead portion of the electrode plate longer than the
longitudinal direction of the metal block, it is possible to solder the lead portion of the electrode
plate to the lead wire at a distance from the piezoelectric element. For this reason, damage to the
soldered connection portion due to vibration is small. Furthermore, since the lead portion of the
electrode plate is coated with an insulating material, the bending position of the lead portion can
be made near the circular portion of the piezoelectric element contact portion without coating
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the piezoelectric element with silicon rubber or the like. Therefore, the outer diameter of the case
of the ultrasonic wave generator including the ultrasonic transducer in its holding portion can be
further reduced.
[0026]
In addition, the ultrasonic wave generator incorporating the ultrasonic transducer of the present
invention can be miniaturized and thinned.
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