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DESCRIPTION JP2001327494

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DESCRIPTION JP2001327494
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic probe provided in an ultrasonic endoscope or the like for transmitting and receiving
ultrasonic waves.
[0002]
2. Description of the Related Art As a technique having heat resistance in a medical ultrasonic
probe, there is JP-A-3-40534. Further, as a technique for reducing the gas permeability of steam
or the like, there are JP-A-2-292747, utility model registration number 2570405, and JP-A-4181896.
[0003]
As a method of sterilizing an ultrasonic probe used in an ultrasonic endoscope and the like which
constitute a body cavity ultrasonic diagnostic apparatus, an immersion method represented by
glutaraldehyde or the like is a main sterilizing means. However, although the autoclave
sterilization which can be sterilized in a short time is desired since sterilization time is long,
autoclave sterilization can not be performed because of the structural problem of the ultrasonic
probe.
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[0004]
In general, an ultrasonic probe has a linear expansion such as a silicone rubber to be an acoustic
lens, an epoxy resin to be a matching layer, a mixture of an inorganic material powder and an
epoxy resin to be a matching layer, and a piezoelectric ceramic in this order from the outer
surface. Because of the laminates having different coefficients, thermal stress is likely to occur
when heat is applied.
[0005]
In particular, the influence on the rubber exposed to steam and the resin under it during
autoclave sterilization is large, and a larger deformation occurs.
As a technique having the possibility of suppressing the occurrence of such thermal stress, as
disclosed in JP-A-3-40534, using a porous metal for the matching layer makes the linear
expansion coefficients of the constituent materials uniform. Things are disclosed.
[0006]
However, since the technique of the above-mentioned JP-A-3-40534 aims to adjust the acoustic
impedance, when exposed to steam such as an autoclave, the gas permeability can not be
increased. The vapor that has permeated the high silicone rubber is easily adsorbed to the
bubbles of the matching layer. Therefore, since the remaining vapors become water in the
material after sterilization, the acoustic impedance changes from a desired value, affecting the
ultrasonic image, and the image quality is degraded.
[0007]
Further, as substitutes for silicone rubber having a high gas permeability, there are those made of
fluororubber having a low gas permeability (Japanese Patent Laid-Open No. 2-297347) and
those having a parylene coating (utility model registration number 2570405). However, there is
no disclosure of an acoustic lens compatible with high heat such as an autoclave and tightness
against steam (vapor tightness).
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[0008]
In addition, since fluorine-based rubber has a greater attenuation than silicone rubber, a method
of coating a fluorine-based resin on silicone rubber to improve gas permeability is disclosed
(Japanese Patent Laid-Open No. 4-181896). However, since an acoustic discontinuity occurs in
the lens, multiple echoes appear in the ultrasonic image, and the image quality is degraded.
[0009]
(Object of the Invention) The present invention has been made in view of the above-mentioned
points, and it is an object of the present invention to provide an ultrasonic probe which can be
autoclaved and can prevent performance deterioration and the like.
[0010]
An array-like transducer group consisting of a piezoelectric transducer having electrodes and an
acoustic matching layer joined on the front side for transmitting and receiving ultrasonic waves,
and electrically connected to each array-like transducer In an ultrasonic probe including an
electrically conductive portion, a backing material for absorbing ultrasonic waves to the back
side, and a cable group for transmitting an electrical signal to each arrayed vibrator, the acoustic
matching layer By using a metal / glass containing bubbles and arranging a vapor-tight material
on the side of the acoustic radiation side with respect to the acoustic matching layer, the vaportight material prevents penetration of water vapor during autoclave sterilization, thereby
providing characteristics Deterioration is prevented, and even if exposed to high temperatures
during autoclave sterilization, the coefficient of linear expansion of the constituent material can
be made uniform by using metal / glass containing bubbles in the acoustic matching layer,
preventing thermal deformation and peeling. it can Unishi to have.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
(First Embodiment) FIGS. 1 and 2 relate to a first embodiment of the present invention, and FIG. 1
shows an appearance of an ultrasonic endoscope provided with the first embodiment of the
present invention. FIG. 2 shows the structure of the ultrasound probe.
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As shown in FIG. 1, the ultrasonic endoscope 1 includes an elongated insertion portion 2 inserted
into a body cavity, a wide operation portion 3 formed at the rear end of the insertion portion 2,
and the operation portion An eyepiece 4 formed at the rear end of the universal cord 3, a
universal cord 5 extending outward from the operation part 3, an endoscope connector 6
provided at the end of the universal cord 5, and the endoscope An ultrasonic cable 7 extended
from the connector 6 and an ultrasonic connector 8 provided at the end of the ultrasonic cable 7
are detachably connected to an ultrasonic observation apparatus (not shown). Ru.
[0012]
The insertion portion 2 is formed with a distal end hard portion 9 formed of a hard member from
the distal end, and a rear end of the distal end hard portion 9 so as to form a bendable bending
portion 10 and a rear portion of the bending portion 10 A long and flexible flexible portion 11
extending from the end to the front end of the operation portion 3 is sequentially provided.
[0013]
The operation unit 3 is provided with an angle knob 12 for performing a bending operation. By
turning the angle knob 12, the bending portion 10 can be bent.
In addition, the operation unit 3 is provided with an air / water feed button 13 for performing an
operation of air supply and water supply and a suction button 14 for performing suction.
Further, a treatment tool insertion port (hereinafter simply referred to as an insertion port) 15
for inserting a treatment tool is provided in the vicinity of the front end of the operation unit 3,
and the insertion port 15 is a treatment tool (not shown) formed in the insertion unit 2. The
treatment instrument channel is in communication with the channel, and the treatment
instrument outlet is an outlet which is a treatment instrument outlet (abbreviated simply as an
outlet or a projection) which is opened at the slope portion 16 of the distal end rigid portion 9.
[0014]
A light guide (not shown) is inserted into the insertion portion 2 and the rear end side of the light
guide reaches a light guide connector 17 provided on the endoscope connector 6 at the end of
the universal cord 5. By connecting the light guide connector 17 to a light source device (not
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4
shown), illumination light is supplied from the light source device. The illumination light is
transmitted by the light guide and emitted from the tip end surface fixed to the tip rigid portion 9
through the illumination lens attached to the illumination window 18 of the slope 16 to the front
side of the illumination window 18 It illuminates a subject such as an affected area in a body
cavity.
[0015]
In addition, an observation window 19 is provided on the slope portion 16, and an objective lens
attached to the observation window 19 forms an optical image at the imaging position, and the
tip surface of the image guide is disposed at the imaging position. The image formed on the front
end surface is transmitted to the rear end surface on the eyepiece 4 side. Then, the image
transmitted through the eyepiece of the eyepiece 4 can be magnified and observed. In addition,
an ultrasonic probe 21 as an ultrasonic transmitting and receiving unit for transmitting and
receiving ultrasonic waves is attached to the outer case 22 at the tip of the distal end hard
portion 9.
[0016]
The ultrasound endoscope 1 is formed of a material having airtightness to water vapor at the
time of autoclave sterilization and heat resistance to high temperature at that time so that
autoclave sterilization can be performed.
[0017]
Next, the configuration of the ultrasound probe 21 will be described with reference to FIG.
FIG. 2 shows the ultrasonic probe 21 in a cross section in the direction orthogonal to the
longitudinal direction of the insertion portion 2. As shown in FIG. 2, the ultrasonic probe 21 is
fixed to an outer case 22 for attaching the ultrasonic probe 21 to the distal end hard portion 9,
and an acoustic wave which focuses ultrasonic waves in a predetermined direction sequentially
from the outer surface Lens 24, second (acoustic) matching layer 25 for matching, first (acoustic)
matching layer 26, piezoelectric vibrator 27 as an acoustic-electric conversion element, and
backing material 28 for absorbing and attenuating ultrasonic waves on the back side The wiring
members 30 which are stacked in order and connected to the electrodes of the piezoelectric
vibrator 27 are connected to the substrate 31.
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[0018]
The piezoelectric vibrator 27 comprises a so-called array-like (ultrasonic) vibrator group having a
large number of vibrator elements formed in an interdigital manner in a direction perpendicular
to the paper surface of FIG. Connected to the electrode.
[0019]
The wiring member 30 is connected to one end of the substrate 31, and the other end not
attached with the wiring member 30 is an internal wiring member (signal cable group not
shown) on the ultrasonic endoscope 1 (the distal end hard portion 9) side. 1) is connected to the
ultrasonic observation apparatus to which the ultrasonic connector 8 of FIG. 1 is connected to
transmit a signal for ultrasonic transmission / reception.
The acoustic lens 24 is formed to surround the second matching layer 25, the first matching
layer 26, and a part of the housing 32, and is fitted into the opening of the outer case 22 so that
the ultrasonic radiation surface of the acoustic lens 24 is outside. It is adhesively fixed as
exposed.
[0020]
In the ultrasonic probe 21 of the present embodiment, the second matching layer 25 (as a heatresistant metal or glass containing air bubbles) is specifically made of foamed aluminum and the
constituent material of the ultrasonic probe 21 And the acoustic lens 24 have a good sealing
function against vapor, and the heat resistance to high temperature during autoclave sterilization.
It is made of fluorine rubber which is also a heat resistant material having a property to prevent
the vapor from invading inside.
[0021]
That is, the first matching layer 26 and the second matching layer 25 are sequentially bonded to
the front surface of the piezoelectric vibrator 27 for transmitting and receiving the ultrasonic
waves, and the acoustic lens 24 is provided on the second matching layer 25. The second
matching layer 25 on the side of the acoustic lens 24 is made of foam aluminum, the linear
expansion coefficients of the constituent materials (of the ultrasonic probe 21) are equalized, and
the acoustic lens 24 on the front side (the ultrasonic radiation side) is It is made of fluorine
rubber, which is a vapor-tight material and a heat-resistant material.
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[0022]
Further, by forming the acoustic lens 24 of fluorine rubber, it is made close to the acoustic
impedance of the living body, and ultrasonic waves can be efficiently transmitted and received
(with less reflection) between the living body side (this acoustic The lens 24 is also made to have
the function of a matching layer).
[0023]
The first matching layer 26 on the side of the piezoelectric vibrator 27 in the two acoustic
matching layers is formed of, for example, crystalline glass having an intermediate value between
the acoustic impedance of the piezoelectric vibrator 27 and the acoustic impedance of the second
matching layer 25. I am trying to do it.
[0024]
Next, the operation of the present embodiment will be described.
By using a fluorine-based rubber for the acoustic lens 24, it has high resistance to gas
permeability, and vapor at the time of autoclave sterilization does not permeate inside the
acoustic lens 24.
Furthermore, the high heat resistance of the fluororubber can reduce the thermal deformation at
the time of autoclave sterilization.
[0025]
Further, the acoustic impedance of the fluorine-based rubber used for the acoustic lens 24 is 1.6
MRayl, and when the first matching layer 26 is formed of crystalline glass (acoustic impedance
14 MRayl), the well-known ideal three-layer acoustic wave is used. Alignment is possible.
[0026]
In addition, when the porosity is adjusted, the density of the foamed aluminum forming the
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second matching layer 25 can be set to, for example, 0.6 g / cm 3.
Since the sound velocity of aluminum is about 6500 m / s, the acoustic impedance is about 3.9
MRayl.
This is referred to as a second matching layer 25.
In addition, the porosity of the foamed aluminum can be adjusted to absorb the difference in
linear expansion coefficient between the component material, in this case, the acoustic lens 24
before and after that and the first matching layer 26. The first matching layer 26 has a value
close to the linear expansion coefficient of the piezoelectric vibrator 27.
[0027]
The foam aluminum is known from LOR Company of the United States, and the crystalline glass
is known from Ishihara Pharmaceutical Co., Ltd. That is, the outer surface of the acoustic lens 24
is brought into contact with the living body by using the ultrasonic probe 21 of the present
embodiment, and the array-like transducer group constituting the piezoelectric transducers 27 of
the ultrasonic probe 21 is made electronic. The ultrasonic wave is emitted in a convex shape by
applying a transmission signal to be scanned, and the reflected ultrasonic wave at the portion
where the acoustic impedance on the living body side is changing is received in the reverse
return path and converted into an electric signal. It sends to the ultrasonic observation device
side.
[0028]
In this case, the piezoelectric vibrator 27 is excited, and the ultrasonic wave emitted from the
front surface is efficiently emitted without reflection at the two matching layers, and can be
emitted toward the living body without reflection at the interface also by the acoustic lens 24. . In
addition, ultrasonic waves reflected on the living body side can be efficiently received. Therefore,
an ultrasonic tomographic image having a good S / N can be displayed on the monitor surface of
the ultrasonic observation apparatus, and accurate ultrasonic diagnosis can be easily performed.
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[0029]
Thus, after being used for ultrasonic diagnosis, sterilization can be performed in a short time by
autoclaving the ultrasonic endoscope 1 with an autoclave sterilizer. In this case, in particular,
since the acoustic lens 24 facing the outer surface of the ultrasonic probe 21 is made of fluorinebased rubber having vapor tightness and heat resistance, it is possible to prevent water vapor
from invading inside and linear expansion. Thermal deformation can also be prevented by
reducing the difference in coefficients.
[0030]
The present embodiment has the following effects. By making the acoustic lens 24 to be exposed
to the steam of autoclave sterilization into a fluorine-based rubber, it has a vapor-tight function,
and it is possible to prevent the deterioration of the image quality due to the intrusion of water
vapor.
[0031]
Further, by suppressing the thermal deformation of the acoustic lens 24 and the thermal
deformation of the second matching layer 25, the thermal stress can be reduced, and the
occurrence of thermal distortion and peeling of the internal structure during sterilization can be
suppressed. Furthermore, steam resistance is further improved by using a peroxide vulcanizing
system as a vulcanizing agent for fluorine rubber.
[0032]
Modification of the First Embodiment Next, a modification of the first embodiment of the present
invention will be described with reference to FIG. In this modification, in the first embodiment,
the first matching layer 26 of the ultrasonic probe 21 in FIG. 2 is made of porous aluminum or
porous glass, and the second matching layer 25 is made of polyimide. is there. The other
configuration is the same as that of the first embodiment.
[0033]
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Next, the operation of this modification will be described. The porous aluminum is different from
the foamed aluminum of the first embodiment in the manufacturing method, and is
manufactured by the powder metallurgy method. The biggest difference is that the distribution
adjustment of porosity and pore size is easy. Specifically, the porosity can be adjusted up to
about 40% and the pore diameter can be adjusted to several nm to several μm. Therefore, the
acoustic impedance when the porosity is 40% is less than 10 MRayl. The porous glass is known
as Corning's Vycor glass, and its acoustic impedance is about 9 MRayl.
[0034]
Then, when a polyimide having an acoustic impedance of 3 MRayl is used for the second
matching layer 5, it becomes close to the well-known ideal two-layer acoustic matching condition.
In addition, the polyimide used for the second matching layer 25 has a low gas permeability
(excellent in steam resistance), and the vapor at the time of autoclave sterilization does not
permeate inside the acoustic lens 24. Furthermore, there is almost no thermal deformation of the
polyimide, and the linear expansion coefficient close to that of the first matching layer 26 and
the piezoelectric vibrator 27 can be obtained.
[0035]
This modification has the following effects. The vapor of autoclave sterilization transmitted
through the acoustic lens 24 can be vapor-tightened by the second matching layer 25. Further,
by suppressing the thermal deformation in the second matching layer 25, the thermal stress can
be reduced and the thermal distortion of the internal structure at the time of sterilization can be
suppressed. As a second modification, the density of the fluorocarbon resin particles of the
fluorocarbon rubber of the acoustic lens 24 may be made higher toward the acoustic radiation
surface side. The acoustic lens 24 having such characteristics can be manufactured as follows.
[0036]
When an aqueous paint in which fluorocarbon resin particles are dispersed in fluorocarbon
rubber is applied to a base material of silicone rubber and baked at a temperature of about 300
degrees, the fluorocarbon resin is concentrated on the surface portion of the coating film. In this
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case, since the density of the fluorocarbon resin changes continuously from the surface toward
the inside, when this resin is used for the acoustic lens 24, the acoustic discontinuity can be
eliminated. In addition, resistance to vapor permeation can be higher than that of fluorine-based
rubber (the function of vapor tightness can be enhanced).
[0037]
Second Embodiment Next, a second embodiment of the present invention will be described with
reference to FIG. FIG. 3 shows an ultrasonic probe 21 'of the second embodiment. The
description of the same parts as those of the first embodiment will be omitted.
[0038]
As shown in FIG. 3, the acoustic lens 24 is formed of silicone rubber having a smaller attenuation
of ultrasonic waves than in the case of a fluorocarbon resin, and the outer surface of the acoustic
lens 24 formed of this silicone rubber has a good vapor density and A coating 35 of fluorine
resin having heat resistance and the like was applied. Although the outer surface is coated in FIG.
3, it may be provided at the interface with the second matching layer 25. Even in this case, the
same effect is obtained. The other configuration is the same as that of the first embodiment.
[0039]
Next, the operation of the present embodiment will be described. The fluorine-based resin has
high resistance to gas permeability, and the vapor at the time of autoclave sterilization does not
permeate to the acoustic lens. Furthermore, the high heat resistance of the fluorine-based resin
makes it possible to reduce the thermal deformation at the time of autoclave sterilization.
[0040]
The present embodiment has the following effects. Since fluorine-based rubber has greater
attenuation than silicone rubber, by using the main material of the acoustic lens 24 as silicone
rubber with low attenuation, sensitivity can be improved over single fluorine-containing rubber,
and vapor tightness is ensured. be able to. The other effects are the same as those of the first
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embodiment.
[0041]
Third Embodiment Next, a third embodiment of the present invention will be described with
reference to FIG. The description of the same parts as those of the first embodiment will be
omitted. In the ultrasonic probe 41 of the third embodiment shown in FIG. 4, the second
matching layer 25 is provided so as to directly face the outer surface, and further, as shown in
FIG. 4, the outer surface has a predetermined curvature radius Has a concave surface that is
curved.
[0042]
The structural difference from the first embodiment is this second matching layer 25. Further,
the difference in material aspect from the first embodiment is that the materials of the outer case
22 and the second matching layer 25 are the same, and this material is a heat resistant resin.
[0043]
Next, the operation of the present embodiment will be described. The acoustic impedance for
optimal acoustic matching is known to make the first matching layer 8.5 MRayl and the second
matching layer 2.4 MRayl. As an example of the acoustic characteristics of the heat resistant
resin, taking polyarylate as an example, the sound velocity is 2340 m / s, and the acoustic
impedance is 2.9 MRayl. That is, if a heat resistant resin is used for the second matching layer
25, it becomes close to the ideal value of acoustic matching.
[0044]
Furthermore, since the second matching layer 25 has a curved surface, the second matching
layer 25 also has a lens effect for focusing at a predetermined distance. Therefore, the
conventional silicone rubber acoustic lens is unnecessary. Moreover, the linear expansion
coefficient of the whole outer surface can be made to correspond by comprising an outer surface
with the same material as exterior case 22. FIG.
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[0045]
Furthermore, the heat resistant resin has low gas permeability and does not allow water vapor in
autoclave sterilization to permeate into the first matching layer 26. The heat resistant resin is as
follows.
[0046]
Polyether imide resin (Ultem), Polyimide resin (Imidalloy), Polyphenylene sulfide (Lyton),
Polyether ether ketone (PEEK), Polyether sulfone (Victorex), Poly sulfone, Poly arylate (U
polymer), Modified imidization Resin (maleca), polyaminobismaleimide (culimide quinel), triazinebased heat resistant polymer (BT resin), isocyanurate-oxazolidone resin (ISOX resin), SP
polyimide resin (Vespel), wholly aromatic polyimide (Nitmid M).
[0047]
The present embodiment has the following effects.
By matching the linear expansion coefficients of the components of the exterior case 22 and the
ultrasonic probe 41, the occurrence of thermal stress during autoclave sterilization is suppressed.
Furthermore, by suppressing the permeation of the vapor into the first matching layer 26, the
vapor-tightness inside the first matching layer 26 can be secured.
[0048]
[Supplementary Note] 1. An array-like transducer group consisting of a piezoelectric vibrator
having electrodes and an acoustic matching layer joined to the front side for transmitting and
receiving ultrasonic waves, a conductive portion electrically connected to each array-like
transducer, and a back side In an ultrasonic probe comprising a backing material for absorbing
ultrasonic waves and a cable group for transmitting an electrical signal to each arrayed
transducer, metal / glass containing air bubbles is used in the acoustic matching layer An
ultrasonic probe characterized in that a vapor-tight material is disposed closer to the acoustic
radiation side than the acoustic matching layer.
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[0049]
2. The second matching layer on the acoustic radiation surface side of the acoustic matching
layer uses foam aluminum as the metal / glass containing the bubbles, and uses a fluororubber
acoustic lens as the vapor-tight material. Ultrasonic probe. 3. The ultrasonic probe according
to claim 2, characterized in that crystalline glass is used for the first matching layer on the side of
the piezoelectric transducer in the acoustic matching layer.
[0050]
4. The first matching layer on the piezoelectric vibrator side in the acoustic matching layer
uses porous aluminum as the metal / glass containing the bubbles, and the second matching
layer uses polyimide as the vapor-tight material. Description ultrasonic probe. 5. The first
matching layer on the piezoelectric vibrator side in the acoustic matching layer uses porous glass
as the metal / glass containing the bubbles, and the second matching layer uses polyimide as the
vapor-tight material. Description ultrasonic probe.
[0051]
6. The ultrasonic probe according to claim 1, characterized in that an acoustic lens is provided
on the acoustic radiation side with respect to the acoustic matching layer, and a moisture-proof
coating is applied to the interface of the acoustic lens to form the vapor-tight material. 7. The
ultrasonic probe according to claim 2, wherein a vulcanizing agent of fluorine-based rubber of
the acoustic lens is a peroxide-vulcanizing system.
[0052]
(Functions and effects of Supplementary Notes 2 to 3, 6 and 7) By making the acoustic lens to be
exposed to the steam of autoclave sterilization into a fluorine-based rubber or a fluorine-based
resin coating, the inside can be made more vapor-tight than the onkyo lens. it can. Further, by
suppressing the thermal deformation of the acoustic lens and the thermal deformation of the
second matching layer, the thermal stress can be reduced and the thermal distortion of the
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internal structure at the time of sterilization can be suppressed.
[0053]
8. The ultrasonic probe according to claim 1, characterized in that a heat resistant resin
material is used for the outer case. 9. As heat resistant resin materials, polyether imide resin
(Ultem), polyimide resin (imidaroi), polyphenylene sulfide (Lightton), polyetheretherketone
(PEEK), polyether sulfone (Victorex), polysulfone, polyarylate (U) Polymers), modified imidized
resin (maleca), polyaminobismaleimide (kelimido quinel), triazine-based heat resistant polymer
(BT resin), isocyanurate-oxazolidone resin (ISOX resin), SP polyimide resin (Vespel), wholly
aromatic polyimide The ultrasonic probe according to appendix 8, characterized in that (Nitmid
M) is used.
[0054]
(Functions and effects of Supplementary Notes 4, 5, 8 and 9) By matching the linear expansion
coefficients of the outer case and the ultrasonic probe, the occurrence of thermal stress during
autoclave sterilization is suppressed. Furthermore, by suppressing the permeation of the vapor
into the first matching layer, the inside can be made more vapor-tight than the first matching
layer.
[0055]
As described above, according to the present invention, an array-like transducer group
comprising a piezoelectric transducer having electrodes and an acoustic matching layer joined on
the front side for transmitting and receiving ultrasonic waves, and each array-like vibration
Ultrasonic probe consisting of a conductive part electrically connected to the probe, a backing
material that absorbs ultrasonic waves on the back side, and a cable group that transmits
electrical signals to each array of transducers In the case of using a metal or glass containing air
bubbles in the acoustic matching layer and arranging a vapor-tight material on the side of the
acoustic radiation side with respect to the acoustic matching layer, the steam intrudes into the
inside during autoclave sterilization. Dense materials are used to prevent property deterioration,
and linear expansion coefficients of components can be made uniform by using metal or glass
containing bubbles in the acoustic matching layer even when exposed to high temperatures
during autoclave sterilization. , Deformation and peeling can be prevented.
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[0056]
Brief description of the drawings
[0057]
1 is an external view showing the entire ultrasound endoscope provided with the first
embodiment of the present invention.
[0058]
2 is a cross-sectional view showing the structure of the ultrasound probe of the first embodiment
of the present invention.
[0059]
3 is a cross-sectional view showing the structure of an ultrasonic probe according to a second
embodiment of the present invention.
[0060]
4 is a cross-sectional view showing the structure of an ultrasonic probe according to a third
embodiment of the present invention.
[0061]
Explanation of sign
[0062]
DESCRIPTION OF SYMBOLS 1 ... ultrasound endoscope 2 ... insertion part 3 ... operation part 9 ...
tip hard part 21 ... ultrasound probe 22 ... exterior case 24 ... acoustic lens 25 ... first (acoustic)
matching layer 26 ... second (acoustic) ) Matching layer 27 ... piezoelectric vibrator 28 ... backing
material 30 ... wiring material 31 ... substrate 32 ... housing
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