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DESCRIPTION JP2000342597

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DESCRIPTION JP2000342597
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic transducer for generating an ultrasonic vibration by supplying a high frequency
current to a vibrating element.
[0002]
2. Description of the Related Art An ultrasonic surgical apparatus used for surgery generally
comprises various probes for generating ultrasonic vibration by supplying high frequency
current to a vibrating element from a power supply unit (oscillator). This makes it possible for
laparoscopic surgery and open surgery.
[0003]
Such surgical devices must be sterile for direct manipulation by the surgeon by hand.
There is no exception to transducers for ultrasonic surgery devices, and it is essential to be able
to perform autoclave sterilization.
[0004]
As such a vibrator, for example, US Pat. No. 5,395,240, Japanese Patent Publication No. 7-
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106206, Japanese Patent Application Laid-Open No. 10-127655, etc. are proposed.
[0005]
In autoclave sterilization, there are various autoclave sterilization methods depending on
combinations of parameters such as time, pressure, temperature, etc., such as a vacuuming step,
a sterilization step, and a drying step.
[0006]
Ultrasonic transducers are not compatible with all these autoclave sterilization methods.
Usually, the cycle of the autoclave is a vacuum, sterilization and drying cycle, but the autoclave
may be urgently performed if it is accidentally dropped to the floor during the operation.
[0007]
In such a case, a cycle of vacuuming and sterilization is performed in which the drying step is
omitted to shorten the time.
If the drying step is omitted, the vapor which has entered may not completely escape inside the
casing of the vibrator disclosed in Japanese Examined Patent Publication No. 7-106206, and may
accumulate as water droplets. If ultrasonic vibration is performed as it is, in a bolt-clamped
Langevin transducer (a transducer), water droplets may stick between the electrodes
sandwiching the PZT, causing a short circuit (short circuit), and the conversion efficiency of the
ultrasonic wave may decrease. there were.
[0008]
Also, in the case of simple autoclave sterilization at a small scale medical institution, there are
cases where only autoclave sterilization without a drying step is performed. Also in this case,
water droplets may accumulate inside the vibrator casing, and as a result, in a bolt-clamped
Langevin type vibrator (transducer), a short circuit is caused due to the adhesion of water
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droplets between electrodes sandwiching PZT (lead zirconate titanate). And the conversion
efficiency of ultrasonic vibration may be reduced.
[0009]
The invention of US Pat. No. 5395,241 is a magnetostrictive vibrator (transducer), so there is no
problem even if the inside is intentionally autoclaved, but the cleaning property is bad and the
bolt-clamped Langevin type vibrator from the viewpoint of miniaturization of the vibrator The
(transducer) is much more advantageous.
[0010]
Further, according to the invention of Japanese Patent Application Laid-Open No. 10-127655,
when autoclave sterilization is performed without a drying process, the vapor does not infiltrate
into the inside of the vibrator, so that the conversion efficiency of ultrasonic vibration does not
decrease.
However, since the O-ring is used for the rotational sliding portion, there is a possibility that the
electrical contact may be uncertain because there is a problem that the rotation can not be
performed smoothly or there is a rotating electrical connection portion. In addition, since the
internal structure of the vibrator is complicated, the weight is increased and the outer diameter
of the vibrator is increased. Of course, from the viewpoint of the versatility of the transducer, the
structure of the transducer should be simple.
[0011]
The present invention has been made in view of the above-mentioned circumstances, and a
bolted Langevin type ultrasonic transducer (transducer) is a simple and highly versatile structure
having no rotational structure, and autoclave sterilization without a drying process. However, it is
an object of the present invention to provide an ultrasonic transducer that can reliably prevent
water droplets from entering the inside of the transducer casing.
[0012]
An ultrasonic transducer according to the present invention comprises a transducer for
converting a driving current into vibration, a horn for forming a flange-like fixed portion at a
base portion, and a horn for enlarging the amplitude of the vibration; A cover that covers the
cover, a support / fixing portion that places a packing between the flange-like fixing portion and
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the cover to support and fix waterproofly, a power cord that supplies the drive current, and an
external that generates the drive current An ultrasonic transducer comprising a plug for
attaching and detaching a cord to a power source, wherein a partition member is provided in the
cover for separating a first chamber surrounding the transducer and a second chamber for
drawing the cord into the cover; Configured
[0013]
In the ultrasonic transducer according to the present invention, the partition member separates
the first chamber surrounding the transducer and the second chamber for drawing the cord into
the cover in the cover, so that the versatility is high without the rotational structure. The simple
structure makes it possible to reliably prevent water droplets from entering the inside of the
vibrator casing even if autoclave sterilization without a drying process is performed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0015]
(First Embodiment) FIGS. 1 to 5 relate to a first embodiment of the present invention, FIG. 1 is an
external view showing an appearance of an ultrasonic transducer, and FIG. 3 is a cross-sectional
view showing the ABC cross section of the vibrator main body of FIG. 1, FIG. 4 is a block diagram
showing the configuration of terminals provided in the transducer of FIG. 2, FIG. 5 is an
ultrasonic wave of FIG. It is a figure which shows distribution of the vibration of a vibrator |
oscillator, and the positional relationship of the inside of a vibrator | oscillator main body.
[0016]
(Configuration) As shown in FIG. 1, the ultrasonic transducer 1 of the present embodiment
includes a plug 2 connected to a generator (not shown) for generating a drive current for
ultrasonically vibrating the ultrasonic transducer 1; It comprises a cord 4 for energizing the drive
current from the plug 2 to the vibrator main body 3 and a waterproof cap 5 for preventing
moisture from invading the inside of the plug 2 when the ultrasonic vibrator 1 is cleaned.
[0017]
2 shows the vibrator main body 3 of FIG. 1 disassembled, and FIG. 3 shows an ABC cross section
of the vibrator main body 3 of FIG.
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[0018]
As shown in FIGS. 2 and 3, inside the vibrator main body 3, a transducer 10 for converting a
drive current from a generator (not shown) into ultrasonic vibration is provided.
The transducer 10 is soldered at one end at which the coating of the electric wire 11 is peeled
off, and the other end at which the coating of the electric wire 11 is peeled is soldered to the
terminal 12.
[0019]
Here, an assembling method in the vicinity of the terminal 12 is shown using FIG.
The terminal 12 is obtained by bending a plate-like metal plate, and the portion to which the wire
11 is soldered is covered with a heat-shrinkable tube 12a for insulation.
A terminal hole 12b is processed at the other end where the electric wire 11 is not soldered.
After the electrode 13 is inserted into the terminal hole 12 b, as shown in FIG. 2, the electrode 13
is inserted into the hole 15 provided in the partition member 14, and the nut 16 is screwed into
the screw portion of the electrode 13.
Thus, the terminal 12 and the electrode 13 are fixed to the partition member 14.
As shown in FIG. 4, the electrode 13 is provided with an O-ring 17 for keeping the air tight.
[0020]
As shown in FIGS. 2 and 3, the wire 20 exposed by stripping the coating of the cord 4 is soldered
to the electrode 13, and the coated end of the cord 4 is fixed by the retaining ring 22 inside the
heat shrinkable tube 21. And the cord 4 is prevented from being inadvertently pulled out of the
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vibrator body 3.
[0021]
To the casing 23 in which the transducer 10 is incorporated, a hook member 26 in which an Oring 24 and an O-ring 25 for air tightness are previously attached is adhered.
A rubber plate 29 is attached to the flange 27 of the transducer 10 on the side of the screw
portion 28 with an adhesive or the like.
[0022]
A partial set of the transducer 10, the nut 16, the partition member 14, the electrode 13, the
terminal 12 and the electric wire 11 is inserted into the casing 23 from the side of the screw
portion 28 of the open end of the casing 23.
At this time, the partition member 14 is fitted into the hole 30 provided in the hook member 26.
Incidentally, the two-face width part 31 is processed in the hole 30, and the two-face width part
31 of the partition member 14 is engaged with it, so that the partition member 14 does not
rotate carelessly.
[0023]
Further, the packing 32 for securing the air tightness is sandwiched between the partition
member 14 and the hook member 26 and the partition member 14 is hooked into the air
tightness confirmation hole 33 using a jig not shown and pulled into the two-surface width
portion 31. Tighten the screw part of the screw with a nut 34. In order to fix the transducer 10 to
the casing 23, the packing 36 and a washer 37 for preventing packing displacement are inserted
from the side of the horn portion 35 which expands the amplitude, and the fixing member 38 is
screwed into the screw portion 28.
[0024]
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Air tightness with the outside is ensured by the O-ring 39 and O-ring 40 and packing 36
assembled to the fixing member 38 in advance. At the time of the airtightness inspection, a
connector for airtightness confirmation is assembled to the airtightness confirmation hole 33,
compressed air is supplied in water, and it is confirmed by the presence or absence of air
bubbles. After completion of the inspection, the airtight cap 42 attached with the O-ring 41 is
screwed in for airtightness. Thereafter, the nut 16 and the electrode 13 are completely sealed by
the sealant 43 in order to prevent short circuit.
[0025]
The inner cap 51, the outer cap 52, and the O-ring 53 pass through the cord 4 in advance, and
the inner cap 51 assembled with the O-ring 54 is screwed to the hook member 26 and further
the outer cap 52 is the outer periphery of the hook member 26 Assemble to. The vibrator main
body 3 is completed by screwing the plug preventing member 55 into the inner cap 51 in order
to prevent breakage of the cord 4. The O-ring 25 and the O-ring 54 prevent moisture from
entering the gap between the inner cap 51 and the hook member 26, and the O-ring 53 prevents
the moisture from entering the gap between the cord 4 and the inner cap 51. Do.
[0026]
FIG. 5 shows the distribution 63 of vibration and the positional relationship inside the vibrator
main body 3. The vibration node 64 is located at the flange 27, the vibration antinode 66 is
located at the tip of the horn portion 35, and the vibration antinode 65 is located at the rear end
of the transducer 10. The antinodes of each oscillation are at the quarter wavelength of the node
64.
[0027]
(Operation) After using the ultrasonic transducer 1 as a transducer of an ultrasonic coagulating
and cutting tool in surgery, disassemble it into a single unit of the ultrasonic transducer 1 and
attach a waterproof cap 5 to the plug 2 to remove dirt such as body fluid Wash. After washing is
complete, the autoclave is put into an autoclave sterilizer.
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[0028]
Inside the autoclave, as a pre-sterilization step, air in the sterilization chamber is pulled to apply
negative pressure. Next, high pressure steam is injected as a sterilization step. The transducer is
thereby sterilized. Usually, the sterilization process is followed by a drying process, and then
removed from the sterilization apparatus. However, if sudden sterilization is required during the
operation, the drying process may be omitted from the series of processes.
[0029]
When the drying process is omitted, the moisture due to the vapor that has entered the inside of
the vibrator main body 3 from the outer cover of the cord 4 and the plug 2 via the inside of the
cord 4 is not completely removed.
[0030]
However, the partition member constituting the inside of the vibrator main body 3 includes the
hook member 26 and the partition member 14, and moisture is in the transducer 10 by the Orings 17 and 41 provided on the packing 32, the electrode 13 and the airtight cap 42. There is
no penetration into the lumen 10a (see FIG. 3).
Further, since the electrode 13 is seal-insulated by the sealing agent 43, no short circuit occurs.
[0031]
(Effect) Thus, in the present embodiment, even if autoclave sterilization is performed immediately
during surgery, autoclave sterilization without the drying process, or autoclave sterilization in a
hospital having only an autoclave apparatus without the drying process, the transducer 10 is
used. Since water does not infiltrate into the interior of a given lumen 10a, there is no oscillation
abnormality of the oscillator, and it can be used for surgery as usual, and prolongation of surgery
time can be avoided.
[0032]
Second Embodiment FIG. 6 is a cross-sectional view showing an axial cross section of a vibrator
main body according to a second embodiment of the present invention.
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[0033]
The second embodiment is almost the same as the first embodiment, so only different points will
be described, the same reference numerals are given to the same components, and the
description will be omitted.
[0034]
(Configuration) In the vibrator main body 3 of the present embodiment, as shown in FIG. 6, the
outer cap 8 in the first embodiment is provided with a terminal portion 72 for connecting an
electric female connection cord. The outer cap 71 has been changed.
The terminal portion 72 is screwed and fixed to the outer cap 71, and watertightness is
maintained by the O-rings 73 and 74.
One end of the wire 75 is soldered to the inner end of the terminal portion 72, and the other end
is soldered to 13.
The other configuration is the same as that of the first embodiment.
[0035]
(Operation) In the present embodiment, when using an electric scalpel at the time of use, the
ultrasonic coagulating and cutting tool can also be used as an electric knife by connecting an
electric knife connection cord to the terminal portion 72. The other actions are the same as in the
first embodiment.
[0036]
(Effects) According to the present embodiment, in addition to the effects of the first embodiment,
when using an electric scalpel during operation, especially when performing endoscopic surgery,
the electric scalpel Since it is only necessary to connect the connection cord to the terminal
portion 72 of the present transducer without replacing the probe for the replacement, the
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replacement of the device during the operation is eliminated, so that the operation can be
performed without bothering the operator.
[0037]
Third Embodiment FIGS. 7 to 10 relate to a third embodiment of the present invention, FIG. 7 is
an external view showing an appearance of a tip side of a vibrator main body, and FIG. 8 is a
vibrator main body of FIG. 9 is an exploded view of the vibrator main body of FIG. 7 in an
exploded view, and FIG. 10 is a cross-sectional view of an axial cross section of the vibrator main
body of FIG.
[0038]
The third embodiment is almost the same as the first embodiment, so only the different points
will be described, the same reference numerals are given to the same components, and the
description will be omitted.
[0039]
(Configuration) In the vibrator main body 3 of the present embodiment, as shown in FIG. 7, the
horn portion 35 for enlarging the vibration amplitude of the transducer 10 has a through hole
81 along the axial center of the vibrator main body 3. It is provided.
Then, as shown in FIG. 8, the member of the horn portion 35 is configured as the same
component as the pipe-like member 82 reaching the rear end of the transducer 10, and the
through hole 81 is a pipe at the rear end of the vibrator main body 3. The suction conduit 98,
which is a through hole of the suction suction nozzle 99, is coaxial with the suction conduit 98.
[0040]
Hereinafter, the configuration of the vibrator main body 3 according to the present embodiment
will be described with reference to FIGS. 9 and 10.
[0041]
A through hole 92 to which an O-ring 91 is attached is provided at the center of a partition
member 90 according to the present embodiment which replaces the partition member 14
shown in the first embodiment. A member 82 is inserted.
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[0042]
In this state, the nut 16, the electrode 13, the transducer 10, and the partition member 90 are
inserted into the casing 23 as in the first embodiment and fixed by the nut 34.
Instead of the inner cap 51 in the first embodiment, the inner cap 93 of the present embodiment
is fixed to the hook member 26 with a screw (not shown), and the pipe 96 with the pipe pipeline
95 assembled with the O ring 94 is It is screwed into the inner cap 93 and inserted into and fixed
to the through hole 92 of the partition member 90.
The suction cap 99 having the suction pipeline 98 assembled with the O-ring 97 is screwed and
fixed to the outer cap 100 of the present embodiment replacing the outer cap 52 in the first
embodiment. It is fixed to the hook member 26.
The cord 4 and the anti-odding member 55 are screwed and fixed at an eccentric position with
respect to the outer cap 100.
The other configuration is the same as that of the first embodiment.
[0043]
(Operation) In addition to the operation of the first embodiment, since the through hole is
provided in the vibrator main body 3 of the present embodiment, a suction tube (not shown) is
connected to the suction cap 99, and external suction is performed. By combining with the
apparatus, the liquid sucked from the tip of the holed probe (not shown) attached to the horn
unit 35 can be discharged from the through hole 81 through the pipe 96 and the suction pipe 98
to the suction tube and discharged to the outside. Further, when the water supply tube is
attached to the suction cap 99, the saline reaches the pipe 96, the through hole 81, the tip of the
holed probe (not shown) from the suction line 98, and the saline in the operation field Water can
be sent.
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[0044]
(Effects) According to the present embodiment as described above, the effects of the first
embodiment can be obtained even when used as a transducer unit of an ultrasonic suction
apparatus. The ultrasonic aspiration apparatus can emulsify and aspirate a living tissue, and the
tissue selective function can aspirate surrounding tissue leaving vasculatures, thereby shortening
the operation time. Surgery can be carried out without delay since saline can be sprayed to the
operative area as needed.
[0045]
[Appendix] (Appendix 1) A transducer for converting driving current into vibration, a horn for
forming a flange-like fixing portion at a base portion for enlarging the amplitude of the vibration,
a cover for covering the transducer, and a flange-like fixing A packing is disposed between the
unit and the cover to support and fix in a waterproof manner, a power supply cord for supplying
the drive current, and a plug for attaching and removing the cord to an external power supply
generating the drive current An ultrasonic transducer, wherein a partition member is provided
inside the cover to separate a first chamber surrounding the transducer and a second chamber
for drawing the cord into the cover.
[0046]
(Additional Item 2) The partition member is provided at a position separated from a node of
vibration existing in the flange-like fixed part of the horn by 1/4 wavelength or more. Sound
transducer.
[0047]
(Additional Item 3) The additional member according to Additional Item 2, wherein the partition
member includes a closing member for closing a space communicating with the first chamber
and the second chamber, and a holding end surface for holding the closing member. Ultrasonic
transducer as described.
[0048]
(Additional Item 4) The ultrasonic vibration according to Additional Item 3, characterized in that
an airtight holding means for ensuring airtightness between the first chamber and the second
chamber is provided between the closing member and the holding end surface. Child.
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[0049]
(Additional Item 5) The ultrasonic wave according to Additional Item 4, wherein the partition
member is provided with an electrical connection portion for supplying a drive current from the
power supply cord from the second chamber to the first chamber. Oscillator.
[0050]
(Additional Item 6) The ultrasonic transducer according to Additional Item 5, characterized in
that airtight holding means for ensuring airtightness is provided between the electrical
connection portion and the partition member.
[0051]
(Additional Item 7) The ultrasonic transducer according to Additional Item 6, wherein a
confirmation hole for airtightness confirmation is provided in the partition member.
[0052]
(Additional Item 8) The ultrasonic transducer according to Additional Item 7, wherein closing
means for closing the confirmation hole for airtightness confirmation is detachably provided.
[0053]
(Appendix 9) The first conduit passing through the central axis of the transducer and the second
conduit passing through the closing member are arranged on the same axis. Ultrasonic
transducer.
[0054]
(Additional Item 10) The ultrasonic wave according to Additional Item 9, characterized in that the
partition member is provided with an electrical connection portion for supplying a drive current
from the power supply cord from the second chamber to the first chamber. Oscillator.
[0055]
(Additional Item 11) The second pipeline includes a cylindrical member penetrating the second
chamber, and a connection hole penetrating the closing means, and the first pipeline and the
cylindrical member are connected 11. The ultrasonic transducer according to item 10, which is
connected to the same axis inside the hole.
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[0056]
(Appendix 12) An airtight holding means for ensuring airtightness is disposed between the
cylindrical inner surface of the connection hole and the cylindrical outer surface of the first
conduit and the cylindrical outer surface of the cylindrical member. The ultrasonic transducer
according to item 11.
[0057]
(Additional Item 13) A second current code for conducting a high frequency current other than
the current for driving the ultrasonic wave is drawn into the second chamber, and connected to
the electrical connection portion. Ultrasonic transducer described in.
[0058]
As described above, according to the ultrasonic transducer of the present invention, the partition
member separates, within the cover, the first chamber surrounding the transducer and the
second chamber for drawing the cord into the cover. Even if it is autoclave sterilization without a
drying process by a highly versatile simple structure which does not have a structure, it is
effective in the ability to prevent that a water droplet penetrates into the inside of a vibrator |
oscillator casing reliably.
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