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DESCRIPTION JP2000185043

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DESCRIPTION JP2000185043
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
distal end portion of an ultrasonic endoscope in which an annular ultrasonic transducer array for
performing radial scanning is disposed at a distal end of an insertion portion.
[0002]
2. Description of the Related Art A member for performing optical observation, a member for
performing ultrasonic scanning, and a treatment tool such as an injection tool are made to
project on the tip of the insertion portion of the distal end portion of an ultrasonic endoscope.
Since the members are provided side by side, the size of the endoscope becomes larger than a
general endoscope and the pain to be given to the patient becomes great.
[0003]
Therefore, an annular ultrasonic transducer array for performing a radial scan is used as a
measure for relatively reducing the size of the insertion portion tip, and a joint between
ultrasonic transducers arranged in an annular shape is used. The optical member and the
treatment tool projecting port were disposed (Japanese Patent Laid-Open No. 2-265533).
[0004]
[Problems to be Solved by the Invention] Since ultrasonic signals have poor conductivity in air,
when ultrasonic scanning is performed from the body cavity, an ultrasonic transducer array is
formed by a balloon filled with degassed water or the like. It is recommended that the ultrasonic
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signal be emitted and received while the balloon is pressed against the mucous membrane of the
body.
[0005]
However, as described above, when the treatment instrument outlet is disposed at the joint
between the ultrasonic transducers, the balloon is pierced by the treatment instrument such as
the injection instrument that protrudes therefrom, so the balloon is used. Good ultrasonic
observation can not be performed.
[0006]
Therefore, according to the present invention, in an ultrasonic endoscope using an annular
ultrasonic transducer array for performing a radial scan, the balloon is attached with a treatment
tool without any risk of breakage and good ultrasonic observation is performed. It is an object of
the present invention to provide a tip portion of an ultrasonic endoscope that can be used.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the tip of the ultrasonic
endoscope of the present invention has an annular ultrasonic transducer array for performing a
radial scan at the tip of the insertion portion. And the treatment instrument projecting port for
projecting the tip of the treatment instrument passed through the treatment instrument insertion
channel is disposed on the side of the tip of the insertion section on the distal side of the
ultrasonic transducer array It features.
[0008]
In addition, the treatment tool raising piece for adjusting the protrusion direction of the
treatment tool protruded from the said treatment tool protrusion opening by remote control may
be arrange | positioned in the said treatment tool protrusion opening.
In addition, a balloon which is inflated by liquid filling may be attached around the ultrasonic
transducer array portion.
[0009]
And an optical observation window may be arrange | positioned along with the said treatment
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tool protrusion opening, and the said ultrasonic transducer array may be arrange | positioned so
that radial scanning may be carried out toward diagonally forward of the said insertion part tip.
[0010]
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 and FIG. 2 are a side sectional schematic view and a plan schematic view of a distal end
portion of an ultrasonic endoscope according to a first embodiment of the present invention.
[0011]
As shown in FIG. 2, the optical observation window 3 and the treatment instrument projecting
port 4 are arranged side by side across the axis as shown in FIG. 2 on the side surface of the
distal end portion 2 of the tip section 2 connected to the tip of the insertion section 1 An annular
ultrasonic transducer array 5 for performing a radial scan is disposed at a position rearward of
that.
An illumination window 30 illuminates the optical observation range.
[0012]
The ultrasonic transducer array 5 is disposed to be inclined with respect to the axis of the tip end
main body 2.
As a result, as shown in FIG. 1, the ultrasonic scanning direction A is not perpendicular to the
axis of the tip body 2 but obliquely.
[0013]
The ultrasonic transducer array 5 is provided so as to radially divide the cylindrical ultrasonic
transducers into a large number so that they sequentially emit and receive ultrasonic waves, and
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so-called ultrasonic waves by so-called radial scanning A scan is performed.
[0014]
The surface of the ultrasonic transducer array 5 is slightly recessed from the surface of the
optical observation window 3 due to its arrangement, so the recessed portion is filled with, for
example, polymethylpentene 6 or the like through which ultrasonic waves pass well.
[0015]
The optical observation window 3 and the treatment instrument projection 4 are disposed in
front of the ultrasonic transducer array 5 at a position where the ultrasonic scanning direction A
is directed obliquely forward, and the optical observation direction is the ultrasonic scanning
direction According to A, it may be a front oblique view or a side view.
[0016]
A treatment tool raising piece 11 for adjusting the protrusion direction of the tip portion of the
treatment tool 100 to be protruded is disposed in the treatment tool protrusion 4 so as to be
pivotable about the support shaft 12, At the back is connected a tip portion of a treatment
instrument insertion channel 14 which is disposed through the entire length of the insertion
section 1.
[0017]
The treatment instrument raising piece 11 is swung by the operation wire 13 which is operated
to be advanced and retracted by remote control from an operation unit (not shown) connected to
the proximal end of the insertion unit 1, whereby the treatment instrument is inserted The
projecting direction of the tip portion of the treatment tool 100 inserted into the channel 14
changes.
[0018]
The treatment tool insertion channel 14, the operation wire 13, the optical observation image
transmission member (image guide or imaging signal transmission cable), the illumination light
guide and the like are disposed in a state of passing through the space inside the ultrasonic
transducer array 5. ing.
[0019]
A balloon 16 is formed of an elastic thin rubber material so as to expand and contract. The
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balloon 16 is detachably attached to the insertion portion 1 by an O-ring-shaped rubber band 17
so as to surround the ultrasonic transducer array 5. It is attached.
[0020]
Deaerated water or the like is taken in and out of the balloon 16 through a water supply tube 18
disposed through the insertion portion 1, and the balloon 16 is inflated by the filling of such a
liquid.
[0021]
Therefore, by pressing the balloon 16 against the mucous membrane of the body cavity, it is
possible to obtain a good ultrasonic tomographic image without an intervening air layer.
Then, since the treatment instrument 100 is projected obliquely forward from the tip side of the
balloon 16, there is no fear that the treatment instrument 100 pierces the balloon 16.
[0022]
When the distal end of the treatment tool 100 is directed to the ultrasonic scan position, the
treatment tool raising piece 11 is operated to raise the distal end portion of the treatment tool
100 protruding from the treatment tool protrusion 4 backward.
However, since the ultrasonic operation direction A is directed diagonally forward, there is no
need to extremely return the distal end of the treatment tool 100 to the rear, so the insertion and
removal resistance of the treatment tool 100 is reduced.
[0023]
FIG. 3 and FIG. 4 are a schematic side view and a plan view of the side cross section of the distal
end portion of the ultrasonic endoscope according to the second embodiment of the present
invention, wherein the annular ultrasonic transducer array 5 is It is disposed coaxially with the
axis of the main part body 2.
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In this case, the ultrasonic scanning direction A is on a plane perpendicular to the axis of the tip
body 2 and the surface of the ultrasonic transducer array 5 is the same as the tip body 2 so that
no dent occurs. .
[0024]
However, the observation optical system should be in a side view (or in a rear oblique view), and
when the tip of the treatment tool 100 is directed to the ultrasonic scanning position, the tip of
the treatment tool 100 is directed backward considerably. Since it is necessary to raise it, the
insertion / removal resistance of the treatment instrument 100 becomes larger than the first
embodiment.
[0025]
According to the present invention, an annular ultrasonic transducer array for performing radial
scanning is disposed around the axis at the distal end of the insertion section, and the distal end
portion of the treatment instrument passed through the treatment instrument insertion channel
is protruded By placing the treatment tool protrusion on the side of the tip of the insertion
portion on the side further than the ultrasonic transducer array, there is a fear that the treatment
tool may damage the balloon even if the balloon is attached so as to surround the ultrasonic
transducer array. It is possible to make good ultrasonic observation.
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