close

Вход

Забыли?

вход по аккаунту

?

JPH042335

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH042335
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic probe for performing observation and diagnosis using ultrasonic waves. [Prior Art] In
recent years, it has been known that an ultrasonic probe for observing and diagnosing an in-vivo
region using ultrasonic waves is incorporated into an endoscope (for example, JP-A-60-227740)
See official gazette). Generally, this type of ultrasonic probe has a structure in which electrodes
are attached to both sides of a piezoelectric element. Then, an ultrasonic wave is generated in the
piezoelectric element by applying an electric signal between the electrodes, and the ultrasonic
wave is emitted into the examination medium. In addition, the piezoelectric element receives
ultrasonic waves reflected from the medium, generates an electric signal between the electrodes,
and can take out the electric signal. An acoustic lens having ultrasonic matching characteristics is
disposed on the surface side electrode of the piezoelectric element, and the acoustic lens
converges the ultrasonic waves. In addition, an ultrasonic damper layer formed by mixing a
conductive material in a synthetic resin is disposed on the back side electrode of the piezoelectric
element, and the ultrasonic wave generated on the back side of the piezoelectric element is
absorbed. The piezoelectric element, the acoustic lens, and the ultrasonic damper layer are
accommodated in the housing via the insulating member. SUMMARY OF THE INVENTION By the
way, the piezoelectric element, the acoustic lens and the ultrasonic damper layer are attached to
the housing through an insulating member. And at least the outer surface of the acoustic lens
should be configured to be exposed to the outside. However, when sterilizing this type of
ultrasonic probe with ethylene oxide gas, touch the exposed outer surface of the acoustic lens or
ultrasonic damper layer, or the exposed surface of the acoustic lens or ultrasonic damper layer.
The resin material and the adhesive of the acoustic damper layer are deteriorated. For this
reason, there has been a problem that the outer exposed surface portions such as the acoustic
lens and the ultrasonic damper layer gradually become so-called smashed state and can not be
03-05-2019
1
used normally. The present invention has been made in view of the above problems, and it is an
object of the present invention to provide an ultrasonic probe in which the durability of at least
an acoustic lens exposed to the outside is enhanced and the durability at the time of disinfection
etc. is improved. It is in. [Means for Solving the Problems and Actions] In order to solve the above
problems, the present invention relates to an ultrasonic probe having an acoustic lens disposed
on the surface side of an ultrasonic transducer, wherein at least a surface portion of the acoustic
lens exposed to the outside is A ceramic coating layer to be coated is provided J, and the
thickness of the ceramic coating layer is formed to a thickness of (1/4) λ or less, where the
wavelength of ultrasonic waves is λ.
Therefore, at the time of disinfection etc., the ceramic coating layer prevents the acoustic lens
from deteriorating and improves the durability. 1 to 7 show a first embodiment of the present
invention. The first embodiment relates to an ultrasonic endoscope A in which an ultrasonic
probe is incorporated into an endoscope. As shown in FIG. 2, the ultrasonic endoscope A includes
an operation unit 1 and a sub operation unit 2 is attached to the operation unit 1. A long
insertion portion 3 is connected to the sub operation unit 2. The insertion portion 3 is provided
with a distal end constituting portion 6 at the distal end of the flexible tube portion 4 via the
curved portion 5. The bending portion 5 is configured to be bendable as described later, and the
bending portion 5 is forcibly bent by remote operation by the operation knob 7 provided in the
operation portion 1. In the case 8 of the sub operation unit 2, a motor 9 as a drive source is
accommodated. The rotation of the motor 9 is transmitted to the output shaft 11 via a reduction
mechanism 10 consisting of a pair of gears. The output shaft 11 is coaxially disposed with the
insertion portion 3. The rotation detector 12 is provided at one end of the output shaft 11. The
other end of the output shaft 11 is connected to a flexible shaft 13 inserted into the insertion
portion 3. The flexible shaft 13 is configured to be bendable from a closely wound coil or the like.
An ultrasonic probe (probe) 14 described later is connected to the tip of the flexible shaft 13. The
ultrasonic probe 14 is installed in the scanning chamber 15 of the tip end portion 6 containing a
liquid serving as an ultrasonic transmission medium. The flexible shaft 13 is inserted into the
guide tube 16. The guide tube 16 is formed by connecting the first tube 17 on the hand side and
the second tube 18 on the tip side with the connection tube 19, and the first tube 170 proximal
end is the case 8 of the sub operation unit 2. It is attached to the proximal end of the flexible
shaft 13 in a fluid-tight manner inside. Further, the tip of the second tube 18 is in communication
with a passage 20 described later inside the tip configuration portion 6. Then, the liquid
ultrasonic medium 2] is filled from the scanning chamber 5 through the passage 20 and the kite
tube 16. The distal end of the flexible shaft 13 is connected to the ultrasonic probe 14, and the
rotational force from the drive source is transmitted to the ultrasonic probe 14 via the flexible
shaft 13 so that the ultrasonic probe 4 is Is supposed to rotate. The first tube 17 is made of a
relatively hard synthetic resin such as Teflon, and the second tube 18 is made of a flexible
synthetic resin such as polyurethane having oil resistance, water resistance and abrasion
resistance. It is molded.
03-05-2019
2
That is, the second tube 18 of the guide tube 16 is located in the curved portion 5. Further, since
the above-mentioned ultrasonic medium 21 is filled in the guide tube 16, this acts as a lubricant.
Further, on the outer periphery of the portion of the second tube 18 located in the curved
portion 5, a spiral tube 22 formed by spirally bending a strip-shaped metal plate is fitted. As
shown in FIGS. 5 and 6, the curved portion 5 is formed by arranging a large number of tubes 23
in the axial direction and rotatably connecting adjacent ones of them. A pair of tubular wire
receptacles 24 is provided on the inner circumferential surface of each tube 23 in
correspondence with the circumferential direction, and the operation wire 25 is inserted through
these wire receptacles 24. The tips of these operation wires 25 are fixed to the most distal tube
body 23. The proximal ends of these operation wires 25 are led to the operation unit 1 and
connected to the bending operation mechanism. Here, by operating the bending operation
mechanism with the operation knob 7, each bending operation wire 25 is pushed and pulled to
bend the bending portion 5 in the pulled direction as shown in FIG. 7, for example. . A signal
cable 26 is inserted into the flexible shaft 13 as shown in FIG. The ultrasound probe 14 is
configured as shown in FIG. That is, the first ultrasonic transducer portion 31 and the second
ultrasonic transducer portion 32 are incorporated in both ends of the cylindrical housing 30
made of a conductive material. Each ultrasonic transducer portion 31.32 has a piezoelectric
element 33 made of a piezoelectric material such as PZT, and a surface electrode 35 is disposed
on the surface of the piezoelectric element 33, and a back surface electrode 36 is provided on the
back surface of the piezoelectric element 33. Are provided. That is, the piezoelectric element 33
of each ultrasonic transducer portion 31.32 is wound as the surface electrode 35 and the back
surface electrode 36. Then, an electric signal is applied between the piezoelectric elements 33
through the electrodes 35 and 36 to excite the piezoelectric elements 33 to cause ultrasonic
vibration. Further, on the surface of the surface electrode 35 of each piezoelectric element 33, a
lens layer 37 as an acoustic lens having an acoustic matching function is disposed. The lens layer
37 is adapted to focus the ultrasonic waves emitted from the ultrasonic transducer portion 3132.
The material of the lens layer 37 is, for example, epoxy resin. A damper layer 38 is filled in a
portion between the ultrasonic transducer portions 31.32. The damper layer 38 is formed, for
example, by mixing a conductive material such as tungsten powder into an epoxy-based synthetic
resin.
The piezoelectric element 33, the lens layer 37 and the damper layer 38 are accommodated in
the housing 30 via a cylindrical insulating member 39. Further, the housing 30, the damper layer
38, and the insulating member 39 are each divided into two in the middle portion, and are
integrated via another insulating layer 40 having an acoustic impedance substantially equal to
that of the damper layer 38. Bonded to. The surface electrodes 35 of the ultrasonic transducer
portions 31. 32 are connected to the external conductors 44. 45 of the signal cables 4243
through separate lead wires 41 and the housing 30, respectively. Each back electrode 36 is
03-05-2019
3
connected to the internal conductor 48.49 of the signal cable 42.43 through the lead wire 4647,
respectively. Furthermore, as shown in FIG. 1, the outer surface of the ultrasonic probe 14 is
coated with a ceramic coating layer 50. The thickness of the ceramic coating layer 50 should be
thin to suppress the attenuation of ultrasonic waves. Assuming that the wavelength of the
ultrasonic wave is λ, it is desirable to form with a thickness of (1/4) λ to (1/8) λ or less. If
possible, it may be less than (1/4) λ. For example, at 7.5 H 2, λ is 533 μm, and at lOH 2 λ is
400 μm. The ceramic coating layer 50 can sufficiently ensure corrosion resistance even if it has
a thickness of several μm, for example, about 5 μm. As a ceramic material of this ceramic
coating layer 50, AI 03 BN, SiC. Use of 5isN4 etc. is possible. As this coating method, vapor phase
coating techniques such as CVD, plasma CDV, sputtering and ion implantation can be used.
Therefore, at present, the processing is relatively easy and it is possible to form thin easily. As
shown in FIG. 1, the entire outer surface of the ultrasonic probe 14 may be coated, including the
housing 30, but in particular only the outer surface of the lens layer 37 from which the
ultrasonic wave is emitted. You may do it. Furthermore, only the thickness of the ceramic coating
layer 50 covering the outer surface of the lens layer 37 may be limited to the above thickness,
and the other portions may be coated or thicker. Further, as shown in FIG. 3, the ultrasonic probe
14 has its shaft 51 axially supported on the slide bearing 52 so as to be able to rotate in the
scanning chamber 15. An injection port 53 is provided on the tip wall of the scanning chamber
15, and the injection port 53 is usually a screw 54 sealed by screwing. Further, a balloon (not
shown) is attached to the outer periphery of the distal end forming portion 6.
The front end edge and the rear end edge of the balloon are fitted in a circumferential groove
56.57 formed on the outer periphery of the tip end portion 6 and attached in a fluid tight
manner. An ultrasonic medium can be supplied / discharged through the liquid feed path 58
inside the balloon. According to the ultrasonic transducer portion 31.32 having such a
configuration, when the piezoelectric element 33 is driven by applying a drive voltage to the
piezoelectric element 33 between the front surface electrode 35 and the back surface electrode
36, each piezoelectric element 33 The ultrasonic waves coming out to the surface side of are
focused when passing through the resin layer 37 having an acoustic matching function and
emitted as an ultrasonic beam. On the other hand, the ultrasonic wave emitted to the back
surface side of the piezoelectric element 33 is attenuated by half of the damper layer 38 in front
of the insulating layer 4 [) and is further distributed through the insulating layer 40 to the back
surface side of the other piezoelectric element 33 The remaining half damper layer 38 is
damped. Therefore, according to this, since the damper layer 38 can be shared without impairing
the damping effect in the two ultrasonic transducer parts 3 and 32, the two ultrasonic
transducers 14 are not changed. The piezoelectric element 33 can be disposed. Further, since the
damper layer 38 is divided into two parts and insulated via the insulating layer 40, a short circuit
between the back electrodes 36 and 36 of the respective piezoelectric elements 33 can be
prevented. On the other hand, the ultrasonic endoscope A is cleaned and disinfected after use.
When this sterilization is performed by exposing to ethylene oxide gas, the plug 54 on the tip
03-05-2019
4
wall of the scanning chamber 15 is removed 1 and the inlet 53 is opened. In addition, a sealing
portion (not shown) in the glj operation portion 2 side portion of the guide tube 16 is opened.
While standing up the ultrasound endoscope A, the ultrasound medium 2 filling the guide tube
16 from the scanning chamber 15 through the passage 20 is released and removed. Then, the
scanning chamber 15 and the like are put in the sterilization tank in a state of being opened to
the outside, and exposed to ethylene oxide gas. Sterilize. At this time, the ethylene oxide gas
intrudes into the scanning chamber 15, and the inside thereof and the outer surface of the
ultrasonic probe 4 etc. IM bacteria in every corner. However, since the outer surface of the
ultrasonic probe 4 including the acoustic lens portion is covered with the ceramic coating layer
50, it is not deteriorated by the component of ethylene oxide gas. Also, 1 Protect the bonded part
with a boxy adhesive. That is, the ceramic coating layer 50 is excellent in chemical resistance and
corrosion resistance, and prevents deterioration of the material covered with the ceramic coat
layer 50.
On the other hand, after disinfecting, the ultrasonic medium 21 is injected from the injection port
53 side, and it can be normally used by filling, sealing and sealing the guide tube 16 from the
scanning chamber 15 through the passage 20. FIG. 8 shows a modification of the ultrasonic
probe 14. This is one incorporating an ultrasonic transducer unit 3]. An insulating layer 60 is
provided on the back side of the damper layer 38. The other structure is the same as that of the
above embodiment, but the same ceramic coating layer 50 is formed on the outer surface of the
ultrasonic probe 14. Although the insulating member 39 is provided to support other members
in the above embodiment and its modification, the insulating member 39 is omitted, and a
ceramic coating layer is provided on the inner surface of the 71 housing 30 instead. May be
provided to ensure insulation. In this way, the conductive housing 30 can be directly used to
incorporate other members without providing the thick insulating member 39. FIG. 9 shows a
modified example of the distal end constituting portion 6 of the insertion portion 3. The distal
end constituting portion 6 connects the balloon 61 attached to the outer periphery thereof with
the scanning chamber 5 through the communication passage 62. The communication passage 62
is formed to communicate with the vicinity of the tip of the scanning chamber 5 and in the tip
portion of the gun chamber 61. Further, the rear end portion of the scanning chamber 15 is
passed through the passage 20 to the guide tube 16. The rear end of the balloon 61
communicates with another passage 63 formed in the insertion portion 3. The ultrasonic probe 4
installed in the scanning chamber 15 is moved back and forth in the scanning chamber 15 to
form a scanning range in the front-rear direction. The formation of the ceramic coating layer on
the ultrasonic probe 14 is the same as that of the above embodiment. Therefore, when sterilizing
ethylene oxide gas in this type, the ultrasonic medium 21 is sucked from the passage 63 and
removed. The inside is sterilized in communication with the outside. Thus, although the
ultrasound probe 14 is exposed to ethylene oxide gas, it is protected by the ceramic coating
layer. In addition, if the ultrasonic medium 2] is injected from the passage 20 (7 and filled and
sealed in the scanning chamber 15 and the balloon 61), it can be used normally. 10 and 11 show
03-05-2019
5
a second embodiment of the present invention. The schematic configuration of the entire
ultrasound endoscope B according to this embodiment is as shown in FIG. The insertion portion
71 includes a distal end portion 72, a bending portion 73, and a flexible portion 74. The distal
end portion of the insertion portion 71 is provided with an ultrasonic probe 75 similar to that
described above.
Further, an endoscope operation unit 76 is connected to the rear end of the insertion unit 7], and
the endoscope operation unit 76 has a bending operation knob 77 for bending the bending unit
73, an air / water supply button It is 78 mag. Furthermore, a universal cord 79 is connected to
the endoscope operation unit 76. A connector 80 connected to a light source device (not shown)
is provided at the end of the universal cord 79. At the rear end of the endoscope operation unit
76, an auxiliary operation unit 8 for driving and operating the ultrasonic probe 75 is provided.
An electric cable cord 82 is connected to the sub operation unit 81, and a connector 83
connected to an ultrasonic observation apparatus (not shown) is provided at the tip of the
electric cable cord 82. Reference numeral 84 denotes an eyepiece unit provided at the rear end
of the sub operation unit 81. The eyepiece unit 84 is located above the center of gravity of the
endoscope operation unit 76. Details of the sub operation unit 81 are shown in FIG. In FIG. 11,
reference numeral 91 denotes a sub operation unit main body, and in the sub operation unit
main body 91, a drive unit unit 93 for rotating the ultrasonic probe 75 in a direction
perpendicular to the axial direction of the endoscope insertion portion 71. Is stored. The drive
unit 93 includes a base 94, a shaft holder 95 provided on the base 94, a hollow drive shaft 98
rotatably supported by the shaft holder 95 via a bearing 96, and the drive. Pull the shaft 98 into
a pulley 99. The belt 100 is composed of a motor 102 driven via a pulley 101, and a rear end
portion of a probe shaft 103 is fixed to a hollow portion of a drive shaft 98 by a screw 104. The
ultrasonic probe 75 is attached to the tip of the probe shaft 103, and is transmitted to the
ultrasonic block 75 through the rotational force of the motor 102 or the probe shaft 103.
Further, the probe shaft 103 has a hollow structure, and the signal cable 110 connected to the
ultrasonic probe 75 is inserted through the hollow portion. At the rear end of the drive shaft 98,
a rotary signal transmission unit 12 having a through hole 111 at its axial center is fitted and
fixed by a screw 113. The rotary signal transmission unit 112 includes a slip ring 114 that
rotates integrally with the drive shaft 98, and a brush 115 that contacts the slip ring 114. One
end of the signal cable 110 is connected to the slip ring 114. One end of a signal cable 117
connected to the amplification amplifier 116 is connected to the brush 115.
A signal from the ultrasonic probe 75 is amplified by an amplification amplifier via the rotary
signal transmission unit 112. Further, a ceramic coating layer is formed on the surface of the slip
ring 114 facing the adjacent one. The ceramic coating layer prevents the slip rings 114 adjacent
to each other from being electrically conducted. The ceramic coating layer is formed in the same
manner as the ceramic coating layer as in the above-described embodiment, but the thickness
03-05-2019
6
may be thicker. As described above, since the ceramic coating layer insulates the slip rings 114
from each other, the storage space can be made smaller than in the conventional case in which
the insulating ring is inserted, and the sub operating portion 81 can be made compact. . That is,
the height H shown in FIG. 10 can be reduced. 12 to 13 show a third embodiment of the present
invention. This embodiment relates to an ultrasound probe 131 introduced into a body cavity
through the channel of the endoscope 130. As shown in FIG. 13, the ultrasonic probe 131 has a
scanning chamber 133 formed at the distal end of the sheath 132, and the ultrasonic probe 134
is rotatably accommodated in the scanning chamber 133. The ultrasonic probe 134 is configured
in the same manner as the above embodiment, and at least the outer surface of the acoustic lens
is similarly coated with a ceramic coating layer with a predetermined thickness. As shown in FIG.
13, the rotary shaft 135 of the ultrasonic probe 134 is pivotally supported by a hole 137 formed
in the housing 136 at the tip end. The rotational shaft 135 of the ultrasonic probe 134 is
connected to a flexible shaft 138 inserted into the sheath 132. The flexible shaft 138 is a
rotational drive source (not shown) installed in the operation unit 139 attached to the proximal
end of the ultrasonic probe 131. Is linked to The ultrasonic probe 31 is connected to the
ultrasonic observation device 42 via the electrical cable cord 141. The ultrasonic observation
device 142 is attached to the light source device 143 for endoscope. A ceramic coating layer is
formed on the outer peripheral surface of the rotary shaft 135 of the ultrasonic probe 134 and
the inner surface of the hole 137 for supporting the same. By forming the ceramic coating layer
in this manner, the lubricity of the bearing portion is secured. That is, separate bearings such as
ball bearings and slide bearings may not be used. Therefore, the shaft support portion is
compact, and the diameter can be reduced despite the mechanical scan type.
FIG. 12 shows the ultrasound probe 131 introduced into the bile duct 144 through the channel
of the endoscope 130. The present invention is not limited to the above-described embodiment,
and various modifications can be considered without departing from the scope of the invention.
[Effects of the Invention] As described above, according to the present invention, the acoustic
lens disposed on the surface side of the ultrasonic transducer can be prevented from
deteriorating at the time of disinfection and the like, and its durability can be improved. Further,
when the thickness of the ceramic coating layer is set to a thickness of (1/4) λ or less when the
wavelength of the ultrasonic wave is λ, the acoustic characteristics are not impaired thereby.
[0002]
Brief description of the drawings
[0003]
03-05-2019
7
FIGS. 1 to 7 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional
view of an ultrasonic probe, and FIG. 2 is a perspective view showing a schematic configuration
of an ultrasonic endoscope. Fig. 3 is a longitudinal sectional view of the distal end portion of the
ultrasonic endoscope insertion portion, Fig. 4 is a sectional view along line A-A in Fig. 3, and Fig.
5 is a flexible tube portion of the insertion portion. FIG. 6 and FIG. 7 are longitudinal sectional
views of the bending portion.
FIG. 8 is a longitudinal sectional view showing a modified example of the ultrasonic probe in the
first embodiment of the present invention. FIG. 9 is a longitudinal sectional view showing a
modification of the distal end portion of the ultrasonic endoscope insertion portion in the first
embodiment of the present invention. FIGS. 10 to 11 show a second embodiment of the present
invention, FIG. 10 is a side view of an ultrasonic endoscope, and FIG. 11 is a longitudinal
sectional view of its operation part. FIGS. 12 to 13 show a third embodiment of the present
invention, FIG. 12 is an explanatory view of a usage state of the ultrasonic endoscope, and FIG.
13 is a sectional view of the tip of the ultrasonic probe. is there. A · · Ultrasonic endoscope, 3 · · ·
Insertion portion, 6 · · · Tip configuration portion, 14 · · · Ultrasonic probe, 31. 32 · · Ultrasonic
transducer portion, 37 · · · Lens layer , 50 ... ceramic coating layer. Applicant Agent Patent
Attorney Suzue Takehiko Fig. Fig. Fig. 4 Fig. 4 Fig. Fig.
03-05-2019
8
Документ
Категория
Без категории
Просмотров
0
Размер файла
20 Кб
Теги
jph042335
1/--страниц
Пожаловаться на содержимое документа