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JPH03231651

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DESCRIPTION JPH03231651
[0001]
[Object of the Invention] (Industrial field of application) The present invention relates to an
intravascular ultrasound probe which is inserted into a blood vessel such as the heart to perform
a mechanical radial scan. (Prior Art) Conventional mechanical radial scanning type intravascular
ultrasonic probes 1, 1o include those shown in FIGS. The ultrasonic probe 1 shown in FIG. 5 has
a transducer 2 with a diameter of 2 [llIn, a mirror 3 disposed opposite to the transducer 2, and
an axis 3a of the mirror 3 coupled to the wire 4a. It has a rotation transmission shaft 4 of outer
diameter number fertilizer that is formed by being wound in a cylindrical shape, and a cylinder 5
in which the vibrator 2 is fixed at an end and the shaft 3a is supported via a bearing Br. The
rotational transmission shaft 4 transmits the rotational power (α direction) of the motor from
the motor side M to the mirror 3 and the ultrasonic wave is reflected by the mirror 3 from the
vibrator 2 while rotating the mirror 3 in the arrow direction (β direction) By doing this,
ultrasonic scanning on the radial surface F can be performed. The ultrasonic probe 1o shown in
FIG. 6 is about 1 mm in diameter inserted and coupled to a vibrator 12 having a diameter of 2
mm, a mirror 13 disposed opposite to the vibrator 12, and a hollow portion 13a of the mirror 13.
And a cylinder 15 for fixedly arranging the vibrator 12 at the end and supporting the shaft 13b
of the mirror 13 via the bearing Br. The rotation transmission shaft 14 also acts in the same
manner as the rotation transmission shaft 4. The blood vessel B1 of the adult heart H shown in
FIG. B2. When ultrasonic scan is performed on the radial surface F by inserting it into B3,
insert the transducer 2.12 from the aortic B1 with a diameter of 10 mm, and then bend the
insertion direction of the transducer 2.12 in a substantially perpendicular direction It is inserted
into a coronary artery (main trunk) B2 having a diameter of about 3 to 5 [IOn], and the insertion
direction is bent in an oblique direction to insert a spiral branch B having a diameter of 2 or less
and a forward descending branch B4. Next, the mirror 3 is rotated by the rotation of the motor to
perform mechanical radial scanning. (Problems to be Solved by the Invention) Clinically, there
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has been a demand for the appearance of an intravascular ultrasound probe capable of
performing an ultrasound scan on a radial surface centered on the convoluted branch B3 + the
anterior descending branch B4. However, in the ultrasonic probe 1 shown in FIG. 5, even if a
transducer having a diameter of 2 mm or less is used, the outer diameter of the rotation
transmission shaft 4 is as thick as several ports over the entire length. There was a problem that
it was impossible to insert to B4. Further, in the ultrasonic probe 10 shown in FIG. 6, when the
rotation transmission shaft 14 is largely bent because it is a straight steel material, the side with
small curvature receives compression force, and the side with large curvature receives tensile
force. receive.
Due to the stress received by this shaft, for example, even if the motor side M is rotated by 90 °,
the rotational force of the motor is not smoothly transmitted to the mirror 13 as the mirror 13
rotates only by 30 °. As a result, there is a problem that rotation unevenness occurs and a good
ultrasonic image can not be obtained on the radial surface F. Therefore, the present invention has
been made in view of the above circumstances, and it is an object of the present invention to
provide an intravascular ultrasound probe which can be inserted into blood vessel details and
can obtain a favorable ultrasound image with little rotational unevenness. . [Means for Solving
the Problems] In order to achieve the above object, the present invention is to insert a vibrator
disposed on the tip end side of a rotation transmission shaft rotated by a motor into a blood
vessel. In the intravascular ultrasound probe having a scanning mechanism for radially scanning
an ultrasonic beam emitted from and received from a transducer, the rotation transmission axis
is disposed on the transducer side and has a small diameter axis substantially the same diameter
as the transducer. And a large diameter shaft disposed on the motor side. (Operation) The
operation of the probe with the above configuration will be described below. When this probe is
inserted into the blood vessel from the large diameter side to the small diameter side of the blood
vessel, the large diameter axis is curved according to this curve even if there is a curve in the
middle of the insertion, and the small diameter axis is together with the vibrator Enter vessel
details. EXAMPLES Examples of the present invention will be described in detail below. An
external view of a first embodiment probe 20 of the present invention is shown in FIG. The
present probe 20 includes a vibrator 22 whose tip is disposed on the side of the substantially
spherical support portion 21 and a mirror 23, and a small diameter shaft 26 disposed on the
vibrator 22 side and a thick one disposed on the motor M side. And a rotation transmission shaft
24 formed by connecting a radial shaft 27. The rotation transmission shaft 24 transmits
rotational power of the motor M in an arbitrary bending state! ! The rotation transmission shaft
24 on the side of the vibrator 22 from the part A can be inserted into the blood vessel. FIG. 2
shows a cross-sectional view of the tip side of the probe 20. As shown in FIG. The probe 20 has a
vibrator 22 with a diameter of about 1 g, a mirror 23 disposed opposite to the vibrator 22, a
support 21 for fixedly supporting the vibrator 22, and a substantially spherical support 21 and a
mirror 23. And a cover cylinder 25 that covers the outer periphery of the rotation transmission
shaft 24 and supports the connection shaft 23a via a bearing Br: Have. The covering cylinder 25
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has, for example, an inner covering cylinder 25a and an outer covering cylinder 25b which are
heat-shrinkable tubes, and the signal cable 22a from the vibrator 22 through which the insertion
port 21a of the support portion 21 is inserted is disposed in the cylinder 25b. And the outer
diameter from the tip of this probe 20 to the number of lengths is reduced to about 2 W or less.
The rotation transmission shaft 24 is formed into a cylindrical shape by winding a steel wire 27 a
by winding a steel wire 27 a and a small diameter shaft 26 made of steel material having a
diameter of about 0.5 mm, which is coupled to the coupling shaft 23 a of the mirror 23. It is
composed of a large diameter shaft 27 with several diameter. The length of the small diameter
shaft 26 is such that, since the circulation branch B3 and the anterior descending branch B4 of
the adult heart H are usually several ports long, the both branches B3. It has a minimum length
corresponding to B4. Therefore, even if the probe 20 is inserted into a curved blood vessel, the
portion receiving stress is small, so that the rotational power from the motor can be transmitted
uniformly. Further, the large diameter shaft 27 has a structure in which the steel wire 27a is
wound in a cylindrical shape, so that even if it is inserted into a blood vessel and becomes a
thickly curved state, a large compression force and curvature occur on the small curvature side.
Since the tensile force generated on the side can be absorbed, the rotational power from the
motor M can be transmitted uniformly. The action and effect of the probe 20 configured in this
way will be described with reference also to FIG. When the transducer 22 of the probe 20 is
inserted through the aortic arch (not shown) from the aorta B1 of the adult heart H shown in FIG.
4 into the circulation branch B3 or the anterior descending branch B4 via the coronary artery B2,
The large diameter shaft 27 is located at a large curve from the aortic arch or aorta B1 to the
coronary artery B2, and the small diameter shaft 26 has an appropriate length such as several
ports, so the artery B2 to the branch B3 ° B4 Located in a small, curvy place. Next, the motor M
is rotated, and the mirror 23 is rotated by the rotational power of the motor M, and an excitation
pulse is sent to the vibrator 22 through the signal cable 22a. Then, the transducer 22 transmits
and receives ultrasonic waves by reflecting the ultrasonic waves in the perpendicular direction by
the mirror 23 and performs ultrasonic scanning on the radial surface F. The echo signal obtained
by scanning is sent to the ultrasonic diagnostic apparatus main body (not shown) by the signal
cable 22a, and the branch B3. A B-mode image of the radial plane F centered on B4 is displayed.
Next, an external view of a second embodiment probe 30 of the present invention is shown in
FIG. 1 similarly to the first embodiment probe 20. The present probe 30 has a support 21.n
configured similarly to the first embodiment probe 20. Transducer 22 ° mirror 33. A small
diameter shaft 36 disposed on the motor M and the vibrator 22 side and a rotation transmission
shaft 34 formed by combining a large diameter shaft 37 disposed on the motor M side are
provided. The rotation transmission shaft 34 has the same function as that of the probe 20, and
the rotation transmission shaft 34 on the side of the vibrator 22 from the portion A can be
inserted into the blood vessel as in the case of the probe 20.
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FIG. 3 is a cross-sectional view of the intravascular ultrasound probe 30 of the second
embodiment of the present invention. Similar to the probe 20 shown in FIG. Support part 21. A
mirror 33 which has a signal cable 22a and a covering cylinder 25 and is connected to a mirror
33 disposed opposite to the vibrator 22 and a coupling shaft 33a of the mirror 33 is the same as
the rotation transmission shaft 24 of the probe 20 A rotation transmission shaft 34 having a
function is grown. The rotation transmission shaft 34 is coupled to the coupling shaft 33a and
wound around a steel wire 37a to form a cylindrical shape, thereby forming a small diameter
shaft 36 having an outer diameter of about 1 mm and a length of 10 ao. The outer diameter is
gradually increased, and the steel wire 37a is similarly wound to form a cylindrical shape,
whereby a large diameter shaft 37 of about several outer diameters is formed. The probe 30
configured in this way functions in the same manner as the probe 20 of the first embodiment
shown in FIGS. 1 and 2. As mentioned above, although each Example was described, this
invention is not limited to this, It can not be overemphasized that a deformation | transformation
implementation is variously possible in the range which does not change the summary. For
example, although the ultrasonic scan is performed on the radial surface using a mirror, the
mirror may be omitted, and the ultrasonic scan may be performed by directly directing the
transducer in the radial direction. [Effects of the Invention] According to the present invention
described in detail above, the rotation transmission shaft is coupled to a small diameter shaft
disposed on the vibrator side and having substantially the same diameter as the vibrator and a
large diameter shaft disposed on the motor side. Since the probe is inserted into the blood vessel
from the large diameter side to the small diameter side of the blood vessel, the transducer can be
inserted into the blood vessel details, and a good ultrasonic image with little rotational
unevenness is obtained. It is possible to provide an intravascular ultrasound probe that can be
obtained.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an external view of each embodiment probe of the present invention, FIG. 2 is a cross
sectional view of a first embodiment probe of the present invention, and FIG. 3 is a cross
sectional view of a second embodiment probe of the present invention FIG. 4 is an external view
of a heart, and FIGS. 5 and 6 are cross-sectional views of a conventional example probe.
20.30 · · · ultrasonic probe, 22 · · · · · · · · · · 24.34 rotation transmission shaft, 26.36 · small
diameter axis, 27. 37 · · large diameter axis, B1 to B4 ... blood vessels, M ... motor.
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