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JPS56104651

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DESCRIPTION JPS56104651
Specification 1, Title 2 of the Invention 7f, Claim (1) In the ultrasonic probe used for ultrasonic
fatigue diagnosis, on the surface not related to the transmission and reception of candlestick
waves at the tip of the probe in contact with the living body A sound absorbing layer comprising
a sound absorbing material having an ultrasonic absorption amount of 10 dB / in or more and an
acoustic impedance of approximately 1.6 × 10′1′f / 71 ′ · sec is formed. Probe for
ultrasonic diagnosis Child.
Ultrasound diagnostic probe
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasound
probe for an ultrasound diagnostic device. A conventional array-type bad-sounding his probe will
be described based on FIG. 1. A convex or concave acoustic lens made of resin (convex in the
figure is formed on the upper surface of the array-type transducer 1 for transmitting and
receiving ultrasonic waves. A sound absorbing unit 3 made of a sound absorbing material is in
contact with and fixed to the lower surface of the shaping lens 2 to form a vibrator unit 4. The
acoustic lens 2 focuses the ultrasonic beam emitted from the array transducer 1 and the
ultrasonic beam reflected from the internal organs, and the sound absorbing unit 3 is emitted
from the array transducer 1 toward the suction unit 3. Absorb ultrasonic waves. The abovementioned vibrator part 4 is filled with filler in the inside of case 5 after the waterproof is made
sufficient and waterproofing is inserted and fixed to the tip of case 5 which consists of a cylinder
whose section is an oval cylinder so that the spherical part of acoustic lens 2 protrudes. It is fixed
by 6. This case 5 is made of wettable plastic, Bakelite resin, Duracon resin, ABS resin or the like.
EndPage: An array-type ultrasound probe consisting of sounds of at least 1! After pressing the
body surface so as not to form the layer A, ultrasonic waves are emitted from the array
transducer 1 into the body. The emitted ultrasonic waves are reflected by the internal organs,
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and the reflected waves are focused by the magnifying lens 2 and then received by the array type
transducer 1 to be converted into an electrical signal to become an image signal. The acoustic
lens 2 uses the acoustic impedance of the living body (1, 5 × 10′K 9 / rd · sec), G 14 f, etc. t
and material R to eliminate the reflected wave and improve efficiency, but the probe In case 5 of
this case, since the vinyl resin etc. of approximately 3.0 X 10 '˜ / sec is used, the reflectance on
the surface of case 5 in contact with the body surface is approximately 1/3, The reflection and
the ultrasonic wave of approximately 1/3 of the wave are reflected and emitted to the internal
organs, and the reflected wave is received by the re-shearing type transducer 1 and becomes a
miscellaneous agency source that harms the image. An object of the present invention is to
provide a probe for ultrasonic diagnosis with less noise source. Hereinafter, an embodiment of
the present invention will be described based on the attached drawings. ! As shown in FIG. 3, the
acoustic lens 2 made of resin is attached to the upper surface of the array type transducer 1 for
transmitting and receiving ultrasonic waves, and the sound absorbing layer 3 made of a sound
absorbing material is welded on the lower surface. Thus, the vibrator portion 4 is formed. The
vibrator portion 4 is fixed by the filler 6 filled in the inside of the case 5 after being sufficiently
fitted with waterproofing and fixed in place in the case 6 of the cylindrical body so that the
spherical surface ′ portion of the acoustic lens 2 protrudes. Sound absorbing material 1fA7
which is made of a sound absorbing material and doubles as a lid is fixed by an adhesive or the
like.
Also, the above-mentioned sound absorption # 7 has an ultrasonic absorption amount of sound
pressure level odor of 1:10 dB / m (frequency m2 M'H2) Ja and an acoustic impedance of about
1.6 X 10 '? / Yrf · sec is made of a material which is a mixture of a polyurethane resin and
tungsten powder so that the volume ratio of tungsten powder is 10 to 30%, or a mixture of
silicon resin and tungsten powder. It consists of a mixture etc. which become 10 to 30% of the
volume ratio of tungsten powder. In the mixture of the polyurethane resin and the tungsten
powder and the mixture of the silicon resin and the tungsten powder, the volume ratio of the
tungsten powder is preferably 20 to 30%, and the mixture preferably has an acoustic impedance
of 1.6 啼 / ·· sec. The ultrasonic absorption rate is approximately 10 dB / m + (frequency 2 MHz).
Instead of bonding and fixing the sound absorbing layer 7 which also serves as the lid, the sound
absorbing layer may be formed by directly coating the mixture on the surfaces of the acoustic
lens 2 and the case 5 which are in contact with the body surface. As described above, the sound
absorption 1 is formed on the surface of the case of the array type ultrasonic probe in contact
with the body surface, and the ultrasonic waves emitted from the array type transducer are
reflected by the internal organs of the body. Then, the reflected wave is received by the array
type transducer and converted into an electric signal to be a 1-magnitude image signal. If the
acoustic impedance of the human body is 1.5 × 10 ′ / h · sec, the reflected wave from the
desensitizing wave received by the sound absorbing layer 7 in contact with the body surface has
a ratio of approximately 1/1 of the sound absorption of −7. It becomes 30 and this sound
absorption @ 7 is reflected by the anti-q, the wave is again reflected by the internal organs. 反 反
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由 由 717 刑 刑 − 姑 吐 吐 吐 吐 ほ と ん ど ほ と ん ど ほ と ん ど ほ と ん ど ほ と ん ど ほ と
ん ど ほ と ん ど ほ と ん ど. Also, if the thickness of the sound absorbing layer 7 is 1.5 votes, for
example, the ultrasonic wave incident on the sound absorbing @ 7 is attenuated by 1 dB by 5 dB
until it reaches the case 5, and is reflected by the case 5. Even if the ultrasonic wave incident by
sound absorption @ 7 is totally reflected by case 5, sound absorption f! It is attenuated by 15
dBlliIi at 7 and attenuated by a total of 30 dB and returned to the organs in the body, but its
ultrasound is about 1/30 times as large as before being incident on sound absorption @ 7, so it
can be completely ignored. Become. In addition, since the lid 7 is made of a material having a
large ultrasonic absorption rate, i.e., a material whose acoustic impedance is almost equal to the
acoustic impedance of the human body, a video signal with little noise can be obtained, and high
accuracy information can be provided for diagnosis. There is. Although the above describes the
first meeting of the array type ultrasonic probe, the present invention can be applied to a disklike single transducer, and an embodiment thereof is shown in FIG.
4. Brief description of the drawings 舐 11 ヅ t + 騙 騙 1 面 笛-+ + n 1 + ÷ 鳳 11 R EndPage: a
sectional view showing an embodiment of 2, Fig. 3 is a perspective view of s 2, Fig. 4 FIG. 8 is a
perspective view showing another embodiment. DESCRIPTION OF SYMBOLS 1 ... Array type ¦
mold vibrator ¦ oscillator 2, 2 ... Acoustic lens, 3 ... Sound absorption city, 4 ... Vibrator part, 5 ...
Case, 6 ... Filler, ° t ... Sound absorption -0 Patent applicant Hitachi Medical Co., Ltd. same agent
鎌 1) sentence 2 figure 1 figure 2 [EndPage: 3
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