JP5479762B2 - Ultrasound endoscope - Google Patents

Description

  The present invention relates to an ultrasonic endoscope in which an insertion portion includes an optical observation portion and an ultrasonic observation portion.

  2. Description of the Related Art As an apparatus for acquiring an ultrasonic tomographic image in a subject that is a living body, an ultrasonic endoscope including an ultrasonic observation unit for transmitting and receiving ultrasonic waves to an insertion unit inserted into the body is known. Yes. Ultrasonic endoscopes are disclosed in, for example, Patent Document 1 and Patent Document 2.

  FIG. 10 shows a perspective view of the distal end portion of the insertion portion of the conventional ultrasonic endoscope, and FIG. 11 shows the distal end portion of the insertion portion of the conventional ultrasonic endoscope from the distal end side along the insertion axis. A view is shown. On the distal end surface 301 of the distal end portion 300 of the insertion portion of the ultrasonic endoscope, a treatment instrument insertion port 302 which is an opening for projecting the treatment instrument, an optical observation unit 330 for acquiring an optical image, an optical observation An illumination light emitting unit 340 for illuminating the visual field of the unit 330 and a fluid delivery unit 360 for delivering a fluid for cleaning the optical observation unit 330 are provided. In addition, the ultrasonic observation unit 320 including the ultrasonic probe 321 is disposed so as to protrude from the distal end surface 301 toward the distal end side of the insertion shaft.

  As an example of the usage form of the ultrasonic endoscope, the position of the treatment tool protruding from the treatment tool insertion port 302 with respect to the position of the blood vessel or the position of the lesion part on the ultrasonic tomographic image obtained by the ultrasonic observation unit 320 is shown. There are known usage patterns in which treatment is performed while checking.

  In order to realize such a usage pattern, the treatment instrument insertion hole 302 and the superimposing tool 302 are arranged so that the scanning surface 320a of the ultrasonic observation unit 320 and the central axis B of the treatment instrument insertion hole 302 are located on the same plane. A sound wave observation unit 320 is preferably disposed. Further, the treatment instrument insertion port 302 and the ultrasonic observation unit 320 are difficult to miniaturize, and occupy a relatively large proportion of the cross-sectional area of the distal end portion 300 of the insertion unit. For this reason, the treatment instrument insertion port 302 and the ultrasonic observation unit 320 are considered when the distal end portion 300 is viewed from the distal end side of the insertion shaft, as shown in FIG. In FIG.

  On the other hand, it is preferable that the optical observation unit 330, the illumination light emitting unit 340, and the fluid delivery unit 360 are arranged close to each other. Therefore, the optical observation unit 330, the illumination light emitting unit 340, and the fluid delivery unit 360 are arranged on one side of the distal end surface 301 with respect to the treatment instrument insertion port 302, in other words, with respect to the plane including the scanning surface 320 a. All are arranged on the side.

JP 2007-236414 A JP 2001-340344 A

  As in the conventional ultrasonic endoscope shown in FIG. 11, the optical observation unit 330, the illumination light emitting unit 40, and the fluid delivery unit 360 are all on one side with respect to the plane including the scanning surface 320a on the distal end surface 301. If it arrange | positions, a structure will be biased to the one side of the front end surface 301. FIG. As a result, the distal end surface 301 protrudes to one side, and the distal end portion 300 of the insertion portion becomes thick.

  The present invention has been made in view of the above-described points, and is an ultrasonic endoscope including an optical observation unit and an ultrasonic observation unit, and an ultrasonic wave having a distal end portion of a thinner insertion portion. An object is to provide an endoscope.

The ultrasonic endoscope according to the present invention is capable of scanning an ultrasonic beam along a plane parallel to the insertion axis of the insertion portion, the insertion portion of the insertion portion, and the insertion axis of the distal portion. an ultrasonic observation unit that have a housing for holding an ultrasonic probe and the ultrasonic probe so as to protrude on the object side of the optical observation unit than the optical observation unit, toward the optical observation unit A fluid delivery section disposed in the housing, and a treatment instrument insertion capable of projecting a treatment instrument on a scanning surface of the ultrasonic observation section. The optical observation section and the fluid delivery section are disposed on one side with respect to the scanning surface when viewed from the distal end side along the insertion axis, and the fluid delivery section When viewed from a direction perpendicular to the scanning plane, Serial characterized in that it is disposed at a position overlapping the ultrasonic probe.

  According to the present invention, in the ultrasonic endoscope including the optical observation unit and the ultrasonic observation unit, the distal end portion of the thinner insertion portion can be realized.

It is a figure explaining the composition of the ultrasonic endoscope of a 1st embodiment. It is a perspective view of the front-end | tip part of the insertion part of the ultrasonic endoscope of 1st Embodiment. It is the figure which looked at the front-end | tip part of the insertion part of the ultrasonic endoscope of 1st Embodiment from the front end side along the insertion axis. It is the figure which looked at the front-end | tip part of the insertion part of the ultrasonic endoscope of 1st Embodiment along the axis | shaft orthogonal to the scanning surface of an ultrasonic observation part. It is a figure which shows the front-end | tip part of the insertion part of a 1st modification. It is a figure which shows the front-end | tip part of the insertion part of a 2nd modification. It is a figure which shows the front-end | tip part of the insertion part of a 3rd modification. It is the figure which looked at the front-end | tip part of the insertion part of the ultrasonic endoscope of 2nd Embodiment along the axis | shaft orthogonal to the scanning surface of an ultrasonic observation part. It is the figure which looked at the front-end | tip part of the insertion part of the ultrasonic endoscope of 2nd Embodiment along the axis | shaft parallel to the scanning surface of an ultrasonic observation part and orthogonal to an insertion axis. It is a perspective view of the front-end | tip part of the insertion part of the conventional ultrasonic endoscope. It is the figure which looked at the front-end | tip part of the insertion part of the conventional ultrasonic endoscope from the front end side along the insertion axis.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each drawing used for the following description, the scale is different for each component in order to make each component large enough to be recognized on the drawing. It is not limited only to the quantity of the component described in the figure, the shape of the component, the ratio of the size of the component, and the relative positional relationship of each component.

(First embodiment)
The first embodiment of the present invention will be described below. An ultrasonic endoscope 101 according to the present embodiment shown in FIG. 1 enables observation of the inside of a subject with an optical image, and transmits and receives ultrasonic waves to a predetermined portion in the subject. Observation is possible with an ultrasonic tomographic image.

  The endoscope 101 includes an insertion unit 102 that is inserted into the body of a subject, an operation unit 103 that is located at the proximal end of the insertion unit 102, and a universal cord 104 that extends from the side of the operation unit 103. It is mainly composed.

  An endoscope connector 104 a connected to a light source device (not shown) is provided at the base end portion of the universal cord 104. The endoscope connector 104a is detachably connected to a camera control unit (not shown) via an electrical connector 105a and detachably connected to an ultrasonic observation device (not shown) via an ultrasonic connector 106a. An ultrasonic cable 106 is extended.

  The insertion portion 102 is disposed at the distal end portion 120 disposed at the distal end, the bendable bending portion 108 disposed on the proximal end side of the distal end portion 120, and the operation portion 103 disposed on the proximal end side of the bending portion 108. A flexible tube portion 109 having flexibility connected to the distal end side is connected.

  The operation unit 103 includes an angle knob 111 for operating the bending of the bending unit 108, and a feed for controlling the fluid delivery operation from the fluid delivery unit 60 which is an opening provided in the distal end 120 described later. An air / water supply button 112 and a suction button 113 for controlling a suction operation from a treatment instrument insertion port 201 which is an opening provided in a distal end portion 120 described later are provided.

  A detailed configuration of the insertion unit 102 of the ultrasonic endoscope 101 according to this embodiment will be described below.

  In the insertion portion 102, a treatment instrument insertion conduit 200 is provided. The treatment instrument insertion conduit 200 is a conduit that connects the treatment instrument insertion port 201 that is an opening provided in the distal end portion 120 and the opening 211 of the conduit base 210 provided in the operation unit 103. .

  In the ultrasonic endoscope 101 of the present embodiment, for example, by inserting a treatment tool from the opening 211 of the pipe base 210, the treatment tool is inserted into the distal end portion 120 through the treatment tool insertion conduit 200. The treatment tool can be introduced into the body of the subject by protruding from the mouth 201. The type of treatment tool is not particularly limited, but a suction biopsy needle or forceps for collecting tissue or body fluid at a predetermined site of the subject can be applied. Further, as described above, the pipe line 200 is used for suction of fluid.

The detailed configuration of the distal end portion 120 of the insertion portion 102 of the ultrasonic endoscope 101 according to the present embodiment will be described below with reference to FIGS.
As shown in FIG. 2, a treatment instrument insertion port 201, an ultrasonic observation unit 20, an optical observation unit 30, an illumination light emitting unit 40, and a fluid delivery unit 60 are disposed at the distal end portion 120.

  As described above, the treatment instrument insertion port 201 is an opening provided in the distal end portion 120 for projecting the treatment instrument, and communicates with the treatment instrument insertion conduit 200. The treatment instrument insertion port 201 is formed on the distal end surface 121 facing the distal end direction of the distal end portion 120.

  The ultrasonic observation unit 20 includes an ultrasonic probe 21 and a housing unit 22 that holds the ultrasonic probe 21. As an example, in the present embodiment, the ultrasonic observation unit 20 protrudes the ultrasonic probe 21 in which a plurality of ultrasonic transducers are arranged in an arc shape in the distal direction from the distal end surface 121 of the insertion unit 120. It has the structure hold | maintained by the housing part 22 provided in this way.

  The ultrasonic observation unit 20 is of a so-called convex scanning type, and drives a plurality of ultrasonic transducers arranged in an arc shape constituting the ultrasonic probe 21 at a predetermined timing. Accordingly, it is possible to scan the ultrasonic beam in a substantially fan shape along a plane substantially parallel to the insertion axis on the outer side in the radial direction of the arc. This surface on which electronic scanning is performed by the ultrasonic probe 21 is referred to as a scanning surface 20a.

  The ultrasonic observation unit 20 is not limited to the convex scanning type. For example, the ultrasonic probe 21 may have a form in which a plurality of ultrasonic transducers are arranged in a straight line, or a form in which a plurality of ultrasonic transducers are arranged in a matrix. . The ultrasonic observation unit 20 may be a so-called mechanical scanning type in which the ultrasonic probe 21 is moved and scanned.

  In addition, for example, a piezoelectric element such as piezoelectric ceramics, an electrostrictive element, or an ultrasonic transducer (MUT; Micromachined Ultrasonic Transducer) using a micromachine technique can be applied to the ultrasonic transducer constituting the ultrasonic probe 21.

  The ultrasonic observation unit 20 is disposed on the substantially fan-shaped scanning surface 20a so that the treatment tool protruding from the treatment tool insertion port 201 is located. In other words, in the ultrasonic endoscope 101 of the present embodiment, the treatment tool protruding from the treatment tool insertion port 201 is present in an ultrasonic tomographic image that is an area observed by the ultrasonic observation unit 20. The treatment instrument insertion port 201 and the ultrasonic observation unit 20 are positioned and arranged.

  Specifically, in the ultrasound observation unit 20, the scanning surface 20a is positioned closer to the distal end side of the insertion shaft than the treatment instrument insertion port 210, and a plane including the scanning surface 20a is connected to the central axis A of the treatment instrument insertion port 201. The scanning surface 20a is arranged so as to pass through a part of the treatment instrument insertion port 201. More preferably, the scanning surface 20a and the central axis A of the treatment instrument insertion port 201 are substantially on the same plane, and the scanning surface 20a and the central axis A of the treatment instrument insertion port 201 are on the distal side of the distal end surface 121. The ultrasonic observation unit 20 is arranged so as to overlap with each other.

  In the present embodiment, in order to realize the positional relationship between the treatment instrument insertion port 201 and the ultrasonic observation unit 20 as described above, as shown in FIG. The central axis L of the substantially fan-shaped scanning range 20a is disposed so as to incline toward the treatment instrument insertion port 201 with respect to the insertion axis.

  The optical observation unit 30 includes an imaging optical system member and an image sensor, and captures an optical image in the field of view with the optical axis O as the center. The optical observation unit 30 is electrically connected to the camera control unit via the electric cable 105 described above. Note that the optical observation unit 30 is not limited to a mode in which an optical image is electronically captured, and may be configured to guide the optical image to an eyepiece provided in the operation unit via an optical fiber cable.

  In the present embodiment, the optical observation unit 30 is disposed on the distal end surface 121 of the distal end portion 120 so that the optical axis O is substantially parallel to the insertion axis of the insertion portion 102. In other words, the optical observation unit 30 in the present embodiment is arranged so that the distal end direction is captured in the visual field along the insertion axis.

  As shown in FIG. 3, when the distal end portion 120 is viewed from the distal end side along the insertion axis, the optical observation unit 30 is positioned on one side of the distal end surface 121 with respect to the plane including the scanning surface 20 a ( It is disposed on the right side of the drawing and at a position where it does not interfere with the ultrasonic observation section 20.

  The illumination light emitting unit 40 emits illumination light for illuminating the visual field of the optical observation unit 30. The illumination light emitting unit 40 is configured to emit light that is emitted from the light source device to which the endoscope connector 104a described above is connected, and that is guided to the distal end portion 120 via the optical fiber cable. The illumination light emitting unit 40 may be configured to include a light source such as an LED at the distal end portion 120 of the insertion unit 102.

  The illumination light emitting unit 40 is disposed on the distal end surface 121 of the distal end portion 120 so that the illumination light is emitted toward the distal end side along the optical axis O of the optical observation unit 30. In addition, as shown in FIG. 3, the illumination light emitting unit 40 has, on the tip surface 121, one side with respect to a plane including the scanning surface 20a as in the optical observation unit 30 (in FIG. 3, directly facing the drawing). (Right side) which is disposed at a position where it does not interfere with the ultrasonic observation section 20. The illumination light emitting unit 40 is disposed on the distal end surface 121 so as to sandwich the optical observation unit 30 between the ultrasonic observation unit 20 and the illumination light emission unit 40.

  The fluid delivery part 60 is an opening provided in the housing part 22 provided to protrude from the distal end surface 121 of the distal end part 120. Further, the fluid delivery part 60 is one side of the housing part 22 with respect to the plane including the scanning surface 20a as in the case of the optical observation part 30 and the illumination light emitting part 40 (in FIG. 3, on the right side facing the drawing). However, it is disposed at a position where it does not interfere with the ultrasonic probe 21.

  The fluid delivery part 60 communicates with a fluid delivery line 61 inserted into the insertion part 102. In the present embodiment, by operating the air / water supply button 112 provided in the operation unit 103, the fluid is delivered from the fluid delivery unit 60 via the fluid delivery line 61. Here, the fluid delivered from the fluid delivery unit 60 is at least one of a gas such as air and a liquid such as physiological saline.

  Since the fluid delivery part 60 is disposed in the housing part 22, the fluid delivery part 60 is located on the distal end side with respect to the distal end face of the optical observation part 30. Then, as indicated by an arrow F in FIGS. 2, 3, and 4, the fluid delivery part 60 is disposed in the housing part 22 so that the fluid is delivered toward the distal end surface of the optical observation part 30. Has been.

  In other words, the fluid delivery unit 60 delivers the fluid from the subject side (the front end side in the direction along the optical axis O) to the optical observation unit 30 from the front end surface of the optical observation unit 30. It is arranged.

  In the ultrasonic endoscope 101 of the present embodiment, the distal end surface of the optical observation unit 30 can be cleaned by sending a fluid from the fluid delivery unit 60, and the optical image obtained by the optical observation unit 30 is clear. Can be maintained.

  In addition, as shown in FIG. 3, it is preferable that the fluid delivery part 60 is arrange | positioned so that the fluid delivered from the fluid delivery part 60 may go to the illumination light emission part 40 further. In other words, when the distal end portion 120 is viewed from the distal end side along the insertion axis, the fluid delivery section 60 is preferably disposed on the opposite side of the illumination light emitting section 40 with the optical observation section 30 interposed therebetween.

  According to such a configuration, the distal end surface of the illumination light emitting unit 40 can be cleaned with the fluid delivered from the fluid delivery unit 60, and a decrease in the intensity of illumination light can be prevented.

  In the present embodiment, as an example, the liquid delivery port 50 is disposed on the distal end surface 121 of the distal end portion 120. The liquid delivery port 50 is for delivering a liquid in the direction of the optical axis O of the optical observation unit 30. The part to be observed by the optical observation unit 30 can be washed with the liquid delivered from the liquid delivery port 50.

  As shown in FIG. 3, the liquid delivery port 50 is disposed on the tip surface 121 on the other side (the left side facing the drawing in FIG. 3) with respect to the plane including the scanning surface 20 a. That is, the liquid delivery port 50 is disposed on the distal end surface 121 so as to sandwich the treatment instrument insertion port 201 between the liquid observation port 30 and the optical observation unit 30.

  As described above, in the ultrasonic endoscope 101 of the present embodiment, the fluid sending unit 60 for sending the fluid toward the optical observation unit 30 at the distal end portion 120 of the insertion unit 102 includes the ultrasonic probe. A housing portion 22 that holds the contact 21 is disposed. The housing portion 22 is provided so as to protrude toward the distal end side of the insertion shaft from the distal end surface 121 of the distal end portion 120 where the optical observation portion 30 is disposed.

  In other words, in this embodiment, the ultrasonic observation unit 20 including the ultrasonic probe 21 and the housing unit 22 that holds the ultrasonic probe 21 is provided so as to protrude toward the subject side of the optical observation unit 30. ing. The housing 22 of the ultrasonic observation unit 20 is provided with a fluid delivery unit 60 configured to deliver fluid toward the optical observation unit 30.

  As shown in FIG. 3, the ultrasonic endoscope 101 according to the present embodiment has an optical observation unit 30 and illumination light on one side with respect to a plane including the scanning surface 20 a of the ultrasonic observation unit 20 at the distal end portion 120. The light emitting unit 40 and the fluid delivery unit 60 are disposed. In the present embodiment, among the optical observation unit 30, the illumination light emitting unit 40, and the fluid delivery unit 60, the fluid delivery unit 60 is disposed in the housing unit 22 of the ultrasonic observation unit 20.

  By arranging the fluid delivery part 60 in the housing part 22 in this way, the optical observation part 330, the illumination light emitting part 340, and the fluid delivery part 360 are all disposed on the tip surface 301 as shown in FIG. Compared to a conventional ultrasonic endoscope, the area of the distal end surface 121 can be reduced by suppressing the amount of protrusion of the distal end surface to one side.

  That is, according to the present embodiment, it is possible to realize the distal end portion 120 of the insertion portion 102 that is thinner than the conventional one. In other words, in the ultrasonic endoscope 101 of the present embodiment, the projected area of the distal end portion 120 of the insertion portion 102 onto the plane substantially orthogonal to the insertion axis can be made narrower than before.

  Moreover, according to the present embodiment, the fluid delivered from the fluid delivery unit 60 can be compared with the conventional ultrasonic endoscope in which the fluid delivery unit is disposed on the distal end surface of the distal end as in the prior art. Further, it can be applied to the optical observation unit 30 from an angle along the insertion axis. Thereby, in the ultrasonic endoscope 101 of the present embodiment, it becomes easy to remove foreign matters attached to the distal end surface of the optical observation unit 30, and the cleaning fluid on the distal end surface of the optical observation unit 30 is also easily drained. The tip surface of the optical observation unit 30 can be cleaned more quickly and reliably than before.

  The configuration of the fluid delivery unit 60 according to the present invention is not limited to the configuration described above and illustrated. For example, the fluid delivery part 60 may be configured to be disposed in the housing part 22 of the ultrasonic observation part 20, and the fluid delivery part 60 is substantially flush with the distal end surface 121 of the distal end part 120 of the insertion part 102. The structure arrange | positioned may be sufficient.

  The opening shape of the fluid delivery unit 60 and the angle and flow rate when the fluid delivered from the fluid delivery unit 60 hits the optical observation unit 30 are appropriately determined according to various conditions in which the ultrasonic endoscope 101 is used. And is not particularly limited.

  For example, if the fluid delivery part 60 is tapered so that the cross-sectional area decreases toward the opening, the flow rate of the fluid delivered from the fluid delivery part 60 can be increased, and the optical observation part 30 can be cleaned more quickly. be able to.

  Further, for example, if the fluid delivery part 60 is tapered so that the cross-sectional area increases toward the opening side, the fluid can be delivered to a wider area including the periphery of the optical observation part 30. .

  Below, the example of a different structure of the fluid delivery part 60 is demonstrated as a 1st modification, a 2nd modification, and a 3rd modification with reference to FIG.5, FIG.6 and FIG.7, respectively.

  In the embodiment described above, the fluid delivery part 60 is an opening formed in the housing part 22. However, in the first modification, as shown in FIG. 5, the fluid delivery part 60 is different from the housing part 22. It is an opening of the nozzle 62 formed separately. The nozzle 62 is fixed in a recess 22 a formed in the housing portion 22. In such a first modified example, the shape of the fluid delivery part 60 is not easily limited by the shape, material and processing method of the housing part 22, so the degree of freedom in selecting the shape of the fluid delivery part 60 is improved.

  Further, in the second modified example, as shown in FIG. 6, a convex portion 22 b is formed on the housing portion 22, and a fluid delivery portion 60 is disposed on the convex portion 22 b. Since the fluid delivery part 60 is disposed in a region of the housing part 22 that does not interfere with the ultrasound probe 21, the fluid delivery part 60 is connected to the ultrasound probe 21 as in the second modification. It is also possible to arrange it so that it protrudes more. In such a second modification, the fluid can be applied to the distal end surface of the optical observation unit 30 at an angle closer to the orthogonal angle.

  In the third modified example, as shown in FIG. 7, a plurality of fluid delivery parts 60 are arranged in the housing part 22. In such a third modification, the angle and flow velocity when the fluid delivered between the plurality of fluid delivery units 60 hits the optical observation unit 30 can be different.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment differs from the first embodiment described above in the configuration of the distal end portion 120 of the insertion portion 102. Hereinafter, only this difference will be described, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

  As shown in FIG. 8, the distal end surface 121 on which the treatment instrument insertion port 201, the optical observation unit 30, and the illumination light emitting unit 40 are disposed is provided at the distal end portion 120 of the insertion portion of the ultrasonic endoscope of the present embodiment. , And is formed so as to be inclined at a predetermined angle with respect to a plane orthogonal to the insertion axis.

  Further, the central axis A of the treatment instrument insertion port 201 and the optical axis O of the optical observation unit 30 are arranged to be inclined with respect to the insertion axis so as to be separated from the insertion axis toward the distal end side. As shown in FIG. 9, the optical observation unit 30 is disposed on one side of the distal end surface 121 with respect to the plane including the scanning surface 20a.

  Similar to the first embodiment, the ultrasonic observation unit 20 is disposed so as to protrude from the distal end surface 121 to the distal end side, and the treatment instrument protruding from the treatment instrument insertion port 201 is an ultrasonic observation. The unit 20 is disposed so as to be positioned on the scanning surface 20a. Further, the fluid delivery part 60 is disposed in the housing part 22 that holds the ultrasonic probe 21 so that fluid can be delivered toward the distal end surface of the optical observation part 30.

  Even in the present embodiment having the above-described configuration, the area on one side of the distal end surface 121 where the optical observation unit 30 and the illumination light emitting unit 40 are disposed can be reduced as compared with the related art. The distal end portion 120 of the thinner insertion portion 102 can be realized.

  Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. An endoscope is also included in the technical scope of the present invention.

  As described above, the present invention is suitable for an ultrasonic endoscope including an optical observation unit and an ultrasonic observation unit at the distal end of the insertion unit.

20 Ultrasonic observation section,
20a scanning plane,
21 Ultrasonic probe,
22 housing part,
22a recess,
22b convex part,
30 Optical observation part,
40 Illumination light emitting part,
50 liquid outlet,
60 fluid delivery section,
61 Fluid delivery line,
62 nozzles,
101 ultrasound endoscope,
102 insertion part,
103 operation unit,
104 Universal code,
105 electric cable,
105a electrical connector,
106 ultrasonic cable,
106a ultrasonic connector,
108 bends,
109 flexible tube,
111 Angle knob,
112 Air / Water button,
113 Suction button,
120 tip,
121 tip surface,
200 treatment instrument insertion conduit,
201 treatment tool insertion port,
210 Pipe cap,
211 opening,
300 tip,
301 tip surface,
302 treatment tool insertion port,
320 Ultrasonic observation section,
320a scanning plane,
321 Ultrasonic probe,
330 optical observation section,
340 Illumination light emitting part,
360 fluid delivery section,
A central axis (of the treatment instrument insertion port 201),
B, the central axis (of the treatment instrument insertion port 302),
L, the central axis (of the scanning range 20a),
O Optical axis (of the optical observation unit 30).

Claims (3)

An insertion part;
An optical observation unit disposed at the distal end of the insertion unit;
An ultrasonic probe capable of scanning an ultrasonic beam along a plane parallel to the insertion axis of the distal end portion and the ultrasonic probe protrude from the optical observation portion toward the subject side of the optical observation portion. an ultrasonic observation unit that have a housing for holding manner,
A fluid delivery part capable of delivering a fluid toward the optical observation part, and disposed in the housing;
A treatment instrument insertion port disposed at the distal end portion and capable of projecting a treatment instrument on the scanning surface of the ultrasonic observation section;
Equipped with,
The optical observation unit and the fluid delivery unit are disposed on one side with respect to the scanning surface when viewed from the distal end side along the insertion axis,
The fluid delivery section is disposed at a position overlapping the ultrasound probe in the insertion axis direction when viewed from a direction orthogonal to the scanning plane. Sonic endoscope 2. The fluid delivery unit according to claim 1, wherein the fluid delivery unit is disposed at a position inside the outer surface of the ultrasonic probe when viewed from a direction orthogonal to the scanning plane . Ultrasound endoscope. The ultrasonic endoscope according to claim 1 , wherein the fluid delivery unit is capable of delivering a fluid from a plurality of directions toward the optical observation unit .

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