JPH08215209A - Laser endoscope - Google Patents

Abstract

PURPOSE: To enable emitting of a laser light from outside a visual field of an optical view tube in such a manner as to keep a laser probe from blocking the visual field. CONSTITUTION: A laser probe 8 is arranged parallel with an optical view tube 4 allowed to view a part to be observed aslant and on the side opposite to the direction of the visual field of the optical view tube 4 while an outer sheath 2 is formed to let the optical view tube 4 and a laser probe 8 be inserted therethrough. The tip of the outer sheath 2 includes a laser reflecting surface to introduce a laser light emitted from a beak 9 and the laser probe 8 into the visual field of the optical view tube 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser endoscope for treating a lesion by introducing a laser probe and an optical tube into the body cavity and irradiating the lesion with laser.

[0002]

2. Description of the Related Art An optical tube for observing tissue in a body cavity and a laser probe for guiding laser light are inserted into the body cavity of a living body,
BACKGROUND ART There is known a technique of irradiating a lesion part of a tissue in a body cavity with laser light as necessary to cauterize the lesion part for treatment. For example, in WO93 / 03678, a laser probe is inserted into a lumen in a living body, and a laser beam is emitted laterally with respect to an axial direction of the laser probe by a reflecting surface provided at a tip portion of the laser probe. The technique of cauterizing is shown.

In USP 5292320, a laser probe is inserted into a lumen of a living body, and a plurality of laser beams emitted from a plurality of laser emitting portions are supplied to a lesion area.
Techniques for treating are shown.

As described above, the technique of inserting the laser probe into the lumen of the living body and irradiating the lesion with the laser beam from the laser probe to cauterize is generally performed as shown in FIG. That is, the observation optical tube b and the laser probe c are inserted in parallel inside the sheath a, the lesioned part e of the living tissue d is observed by the optical tube b, and the laser probe c is attached to the lesioned part e. Is irradiated with the emitted laser beam to cauterize the lesion area e. In FIG. 20, f is the observation visual field, and g is the laser irradiation position.

[0005]

However, in the endoscope used in the conventional lumen, a perspective optical tube is usually used so that the tissue can be easily observed. Further, in order to perform the processing while confirming the operation of the processing forceps, the forceps passage is provided below the insertion part of the optical viewing tube, that is, in the perspective direction of the optical viewing tube so that the tip of the processing forceps enters the visual field of the optical viewing tube. To be

When performing laser treatment, a laser probe is inserted through the forceps passage instead of the forceps. When laser irradiation is performed with the tip of the laser probe being guided into the field of view, the laser probe obstructs the field of view, making it difficult to observe the irradiated site. Further, since the laser irradiation is performed in a state where the tip of the laser probe is close to the tissue, the tissue piece and the blood tube are easily attached to the laser reflecting surface for emitting the laser laterally. For this reason,
Degradation and burning of the reflecting surface are likely to occur.

Further, since the laser probe and the optical tube are not fixed, it is necessary to adjust the laser irradiation direction independently of the direction of the endoscopic image, which tends to be complicated and inaccurate. Therefore, it becomes difficult to perform effective and efficient laser irradiation. In addition, there is a problem that running cost becomes high.

Further, in WO93 / 03678, laser light is directed toward the tissue surface. For this reason, the cauterization effect may not reach the deep lesion of the tissue. Moreover, it is not possible to cauterize only the deep part of the tissue while preserving the tissue surface. Further, when used in combination with a normal endoscope, a perspective view of the optical tube is used, so that the tip of the probe is viewed obliquely from above in the endoscopic image. Therefore, it is difficult to grasp the direction of the probe tip, that is, the laser emission direction. Therefore, it becomes difficult to perform appropriate laser treatment.

Further, in USP 5292320, since the laser emission amounts of the plurality of laser emission portions are fixed, it is not possible to obtain an appropriate emission distribution of laser light according to the shape of the tissue to be treated. For example, it is not possible to set a laser emission distribution according to the tissue thickness for a tissue in which the thickness of the tissue varies greatly depending on the location.
Due to the above, it is difficult to perform appropriate laser treatment.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a laser endoscope capable of performing effective and efficient laser treatment. .

[0011]

In order to achieve the above-mentioned object, the present invention provides an optical viewing tube capable of obliquely observing a region to be observed and a viewing direction of the viewing tube parallel to the viewing tube. A laser probe provided on the opposite side, a sheath through which the optical tube and the laser probe are inserted, and a laser beam emitted from the laser probe provided at the tip of the sheath within the visual field of the optical tube. And a laser reflecting surface for guiding to.

[0012]

[Operation] When the optical tube and the sheath constituting the insertion portion of the laser endoscope are inserted into the body cavity and laser light is emitted from the laser device, the laser light propagates through the laser probe and is emitted from the laser probe emission end. It The emitted laser light is reflected by the laser reflection surface, changes its direction at a substantially right angle, and is supplied to the living tissue. The relationship between the laser irradiation direction and the visual field direction of the optical tube is set so that the laser-irradiated biological tissue fits within the visual field of the optical tube, so the image of the biological tissue captured by the optical tube is It is transmitted to the eyepiece of the optical tube and can be observed by the operator.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment.
Shows a schematic configuration of the laser endoscope 1, 2 is an outer sheath of the laser endoscope 1, and 3 is an inner sheath inserted into the outer sheath 2. The insertion portion 7 of the optical tube 4 and the laser probe 8 are inserted into the inner sheath 3 in parallel, and the laser probe 8 is placed above.

The optical tube 4 is provided with an insertion part 7 to be inserted into the inner sheath 3 and a proximal structure 5 on the proximal side connected to the proximal end of the insertion part 7. Further, the hand side structure 5 is provided with an eyepiece section 6 having an eyepiece lens built therein.

FIG. 2 shows the tip shape of the outer sheath 2. A beak 9 having a beak shape is provided at the tip of the outer sheath 2 and is cut out while leaving a part of the peripheral surface of the cylindrical body of the outer sheath 2. On the inner surface of the beak 9, a laser probe positioning member 10 composed of a protrusion and a laser reflecting surface 11 are provided.

In FIG. 3, a laser probe 8 is attached to the inner sheath 3.
The optical endoscope 4 is inserted, and the inner sheath 3 is inserted into the outer sheath 2. FIG. 4 shows a state when performing laser treatment.

Next, the operation of the laser endoscope will be described. The insertion portion of the laser endoscope 1 is inserted into the body cavity, and the laser probe 8 inserted into the inner sheath 3 is used in a state of being abutted against the laser probe positioning member 10. The axial positions of the optical tube 4 and the inner sheath 3 are fixed by the structure of an endoscope operating section (not shown). The laser beam L propagating through the laser probe 8 from a laser device (not shown) is emitted from the laser emission end 8a. The emitted laser light L is reflected by the laser reflection surface 11, changes its direction at a substantially right angle, and is supplied to the living tissue A. The relationship between the laser irradiation direction and the visual field direction of the optical visual tube 4 is set so that the laser-irradiated living tissue A falls within the visual field B of the optical visual tube 4. Therefore, the image of the living tissue A captured by the objective optical system (not shown) at the tip of the optical tube 4 is transmitted to the eyepiece 6 by the relay optical system (not shown) and can be observed by the operator. A fluid passage (not shown) is provided inside the outer sheath 2 so that the laser reflecting surface 11 and the tip of the optical tube 4 can be washed.

As described above, the laser light L is emitted from the side opposite to the visual field direction of the optical visual tube 4 so as not to obstruct the visual field of the optical visual tube 4, and irradiates the living tissue A in the visual field B. By performing the above, a good observation image of the irradiation site can be obtained. As a result, effective and efficient laser irradiation can be performed.

Further, since the laser reflecting surface 11 is provided at a position away from the living tissue A, seizure of the reflecting surface due to adhesion of a piece of tissue can be prevented. As a result, efficient laser irradiation becomes possible. In addition, running costs can be reduced. Further, since the relationship between the laser irradiation direction and the visual field direction is always constant, there is an effect that the irradiation direction can be adjusted easily and accurately.

FIG. 5 shows a second embodiment. In this embodiment, the shape of the reflecting surface 11 is changed from that of the first embodiment,
The reflecting surface 11 is a concave curved surface. With the concave reflecting surface 11 thus formed, the laser light L emitted from the laser probe emitting end 8 a is condensed by the laser reflecting surface 11 and supplied to the living tissue A.

By condensing the laser light L, the area of the laser light L is small and the energy density is high. It is effective when you want to give a large cauterizing effect in a narrow area.
The shape of the laser reflecting surface 11 is not limited to the concave curved surface, but can be various shapes. For example, the laser reflecting surface 11 is a convex curved surface,
If the laser light L is made into a convex spherical surface and guided to the tissue in a spread state, the beam area becomes large and the energy density becomes low, which is effective when a mild ablation effect is desired to be applied to a wide range.
Furthermore, by changing the shape of the laser reflecting surface 11 variously, it is possible to obtain the laser beam L having an arbitrary shape, and it is possible to select a laser beam shape suitable for various treatment targets.

FIG. 6 shows a modified example of the first embodiment, in which the beak 9 has a curved tip 9a. This improves the insertability of the endoscope. 7 to 11 show a third embodiment. FIG. 7 shows the overall configuration of the laser endoscope 21 of this embodiment, and FIG. 8 shows the configuration of the distal end portion of the outer sheath 22. The wire 30 is inserted through the wire insertion passage 30 a provided in the outer sheath 22. A probe raising base 31 is connected to the tip of the wire 30. The probe raising base 31 is rotatably supported by the outer sheath 22 via a pivot shaft 32, and a reflecting surface 33 is formed on one surface thereof.

At the rear end of the outer sheath 22, there is provided a probe raising base adjusting portion 29 comprising a rotary knob, and the rear end of the wire 30 is connected to the probe raising base adjusting portion 29. The inner sheath 23 has an optical tube 24.
The optical tube insertion portion 23a into which the insertion portion 27 is inserted, and the laser probe insertion portion 23b into which the laser probe 28 is inserted are provided. The other structure is similar to that of the first embodiment.

In FIG. 9, the laser probe 2 is attached to the inner sheath 23.
8 and the optical tube 24 are inserted, and further the inner sheath 23 is inserted into the outer sheath 22. 10 and 11 show a state when performing laser treatment.

Next, the operation of the laser endoscope 21 configured as described above will be described. As shown in FIG. 10, the insertion portion of the laser endoscope 21 is inserted into the body cavity, and the laser irradiation is performed with the laser emission end 28a of the laser probe 28 positioned behind the probe raising base 31. In this case, the laser light L propagating in the laser probe 28 from a laser device (not shown) is emitted from the laser emission end 28a, and then the probe raising base 3 is provided.
The light is reflected by the reflection surface 32 provided on the lower surface of the laser beam 1 to change its direction, and is emitted laterally with respect to the axial direction of the laser endoscope 21. This emission angle can be set to a desired angle by adjusting the angle of the probe raising base 31 by the probe raising base adjusting unit 29. This irradiation method is suitable when laser irradiation is performed in a state where the laser endoscope 21 and the biological tissue A are close to each other.

In FIG. 11, laser irradiation is carried out with the laser probe 28 being raised by the probe raising base 31. That is, the tip of the laser probe 28 is bent by the probe raising base 31, the laser emitting end 28 a thereof faces the biological tissue A, and the laser beam L emits the laser emitting end 28 a of the laser probe 28.
After being emitted further, it is directly supplied to the living body. The emission angle can be arbitrarily set by adjusting the angle of the probe raising base 31. The position of the laser emitting end 28a can also be set to a desired position by advancing and retracting the laser probe 28 and adjusting the angle of the probe raising base 31. This irradiation method limits the movement of the laser endoscope 21 due to the tissue shape,
When the tip portion of the laser endoscope 21 cannot approach the treatment target site, it is possible to approach the treatment site only with the laser probe 28 and perform appropriate laser irradiation.

By adjusting the laser emission angle and the emission position in this manner, effective laser treatment suitable for various treatment targets can be performed. For example, when performing laser irradiation on a lesion that has reached a relatively deep portion within a narrow body cavity, first, the laser light L from the probe raising base 31 is used.
The lesion is cauterized by the irradiation method that uses the reflex of the. At this time, if the cauterization cannot be performed to the deep part of the lesion, the laser probe 28 is raised by the probe raising base 31 and the laser emitting end 28a is brought closer to the deep lesion to additionally irradiate the lesion. Sufficient cauterization is realized.

12 to 14 show another laser probe, and FIGS. 12 and 13 show a laser probe 41.
Shows the tip of the. An opening 42 is provided on the tip side of the laser probe 41. The laser probe 41 is provided with a guide needle 43 that can move forward and backward within the opening 42 and into which an optical fiber is inserted. Further, the laser probe 41 is provided with a suction path 44 communicating with the opening 42, and the laser probe 41 is connected to a laser device and a suction device (not shown).

As shown in FIG. 14, the laser probe 4
When 1 is inserted into the living body lumen and suction is performed through the absorption path 44 in a state where the opening 42 is brought close to the treatment target site, the treatment target tissue C is taken into the opening 42. In this state, it is possible to puncture the tissue C with the guiding needle 43 and perform laser irradiation.

By irradiating the laser in a state where the treatment target portion is taken in the laser probe 41 in this way, reliable laser treatment of the treatment target portion is realized. Further, by piercing the tissue C with the guiding needle 43 and performing laser irradiation from the inside of the tissue C, it is possible to perform laser treatment on the deep portion of the tissue C. At this time, organization C
The surface of the tissue C is preserved and only the deep part of the tissue C can be cauterized by irradiating the surface of the tissue with laser light to such an extent that the ablation effect by the laser light L is not reached. This method is extremely effective, for example, in laser treatment of benign prostatic hyperplasia when the urethral mucosa on the surface of the prostate is preserved and only the tissue inside the prostate (which is called the internal gland) that causes hypertrophy is cauterized.

FIG. 15 shows the tip of another laser probe 51. A plurality of notches 52a to 52e are provided in a sawtooth shape on the tip side of the laser probe 51, and laser emitting parts 53a to 53e are provided in the notches 52a to 52e. Of the laser emitting parts 53a to 53e,
A beam splitter 54 is provided on the slopes of the laser emitting portions 53a to 53d, and a total reflection surface 55 is provided on the laser emitting portion 53e on the most distal side, leaving the laser emitting portion 53e on the most distal side. Also, the laser probe 51
Is connected to a laser device (not shown).

Therefore, the laser beam L propagating through the laser probe 51 from the laser device is beam splitter 5 at the laser emitting portions 53a to 53d.
Due to the action of 4, a part of the light is reflected and emitted laterally with respect to the axial direction of the laser probe 51, and the rest is transmitted and goes straight. The laser light L transmitted through the beam splitter 54 of the laser emitting portion 53d is totally reflected by the action of the total reflection surface 55 of the laser emitting portion 53e. By independently selecting the reflection / transmission characteristics of the beam splitter 54 in each of the laser emitting units 53a to 53d, the laser emission amount in each of the laser emitting units 53a to 53e can be freely set.

16 and 17 show another laser probe, and FIG. 16 shows the tip of the laser probe 61. Inside the laser probe 61, a plurality of independent optical fibers 62a to 62e are arranged with their laser emission ends 63 displaced in the axial direction. It is possible to freely set the laser emission amount from each laser emission end 63 by adjusting the laser power guided to each optical fiber 62a to 62e on the side of the laser device (not shown).

In this way, in the laser probe 61 having a plurality of laser emitting ends 63, the laser emitting amount of each emitting portion can be freely set to obtain an appropriate laser light emitting distribution according to the shape of the tissue to be irradiated. As a result, effective and efficient laser irradiation becomes possible.

For example, as shown in FIG. 17, in the case of laser irradiation to the prostate D, a large laser power is applied to a thick tissue portion at the center of the prostate D and a thin tissue portion at the end portion of the prostate D. For the above, the laser emission amount of each emission unit is set so that a small laser power is supplied. In this state, when laser irradiation is performed in a certain circumferential direction of the prostate D, irradiation in the entire circumferential direction is completed by one irradiation in the circumferential direction. Therefore, for the second and subsequent irradiations, the laser probe 61 may be fixed in the axial direction and rotated in the circumferential direction to repeat the irradiation sequentially.

This irradiation method can supply the laser power extremely easily and accurately. As a result, optimal treatment can be performed and the operation time can be shortened. 18 and 19 show another laser probe, and FIG. 18 shows the tip structure of the laser probe 101. FIG. 18 (b) is shown in FIG.
The state where the laser probe 101 is rotated 180 ° with respect to (a) is shown. 102 is an outer tube for inserting an optical fiber, 104 is a reflection chip for reflecting laser light,
Reference numeral 103 is a holding portion that connects the outer tube 102 and the reflective chip 104. The reflecting surface of the reflecting chip 104 is 10
5 and direction indicators 106a, 106b, 106c, 106
d is provided.

According to such a configuration, the outer tube 1
The laser light L emitted from the emission end of the optical fiber inserted in 02 is reflected by the reflecting surface 105, changes its direction at a substantially right angle, and is emitted laterally with respect to the axial direction of the laser probe 101. The direction of the normal line at the center points of the indexes 106a and 106b is the same as the direction from which the laser light L is emitted. The directions of the normal lines at the center points of the indicators 106c and 106d differ from the emitting direction of the laser light L by 90 °.

Examples of endoscopic images are shown in FIGS. 19 (a), (b),
It is shown in (c). When the emitting direction of the laser light L is the upper side,
As shown in FIG. 19A, the normal direction of the index 106a (dotted line)
Thus, the emission direction (solid line) of the laser light L can be estimated. When the emission direction of the laser light L is on the lower side, the emission direction (solid line) of the laser light L can be estimated from the normal line and the direction (dotted line) of the index 106b as shown in FIG. FIG. 19 (c)
Indicates that the laser emission direction is judged from the fact that the indicator 106c is directly above (12 o'clock direction) in the state where the emission direction of the laser light L is rightward to the left (9 o'clock direction). Similarly, when the index 106d is directly above (12 o'clock direction), the emission direction of the laser light L is right beside (3 o'clock direction).

Therefore, it is possible to perform appropriate laser irradiation by easily and surely grasping the emitting direction of the laser light L in the endoscopic image. According to the above embodiment, the following configuration is obtained. (Supplementary Note 1) An optical tube capable of obliquely observing a site to be observed, a laser probe provided in parallel with the optical tube and on a side opposite to a visual field direction of the optical tube, the optical tube and a laser. It is characterized by comprising a sheath through which a probe is inserted, and a laser reflecting surface which is provided at a distal end portion of the sheath and which guides laser light emitted from the laser probe into the visual field of the optical tube. Laser endoscope. (Supplementary Note 2) In the supplementary note 1, the laser reflecting surface is provided inside the beak. (Supplementary Note 3) A laser endoscope according to Supplementary Note 1, wherein a laser probe raising means is provided at the tip of the sheath, and a laser reflecting surface is provided on the laser probe raising means. (Supplementary Note 4) A laser endoscope according to Supplementary Note 1, further comprising a laser probe positioning member that abuts the tip of the laser probe on the sheath. (Supplementary Note 5) The laser endoscope according to Supplementary Note 1, wherein the sheath is provided with a liquid passage for supplying a liquid to the distal end portion of the endoscope. (Supplementary Note 6) A laser endoscope according to Supplementary Note 1, wherein the laser reflecting surface is a flat surface. (Supplementary Note 7) A laser endoscope according to Supplementary Note 1, wherein the laser reflection surface is concave or convex. (Supplementary Note 8) A laser endoscope according to Supplementary Note 1, wherein the laser reflection surface is a concave or convex spherical surface. (Supplementary Note 9) The laser endoscope according to Supplementary Note 1, wherein the tip of the beak is curved. (Supplementary Note 10) A laser probe having an opening provided in a probe main body for taking in tissue, a guide needle capable of advancing and retreating with respect to the opening for inserting a laser guide, and a suction path communicating with the opening. (Additional remark 11) In the additional remark 10, a liquid for cleaning the tip of the guiding needle and the opening can flow through the suction passage. (Additional remark 12) In the additional remark 10, the forceps can be inserted through the suction path to grasp the tissue. (Supplementary Note 13) A laser probe in which a plurality of laser emitting portions are provided on a probe body, and a laser emitting amount in these laser emitting portions can be arbitrarily selected. (Supplementary Note 14) In the supplementary note 13, the laser emission direction is lateral to the axial direction of the laser probe. (Supplementary Note 15) In the supplementary note 13, the plurality of laser emitting portions are provided in a straight line in the axial direction of the laser probe. (Additional remark 16) In the additional remark 13, a plurality of laser emitting portions are provided in a plane perpendicular to the axial direction of the laser probe. (Supplementary Note 17) The laser probe according to Supplementary Note 13, wherein the laser emitting portion is provided with a beam splitter. (Supplementary Note 18) The laser probe according to Supplementary Note 17, wherein the beam splitter is detachable. (Supplementary Note 19) In Supplementary Note 13, the laser probe has the same number of optical fibers as the laser emission units, and the laser emission amount at each emission unit is set by adjusting the amount of laser light guided to each optical fiber. A laser probe characterized by the above. (Supplementary Note 20) A laser probe that laterally emits laser light, wherein an index indicating a laser emission direction is provided near the laser emission portion.

According to Supplementary Note 1, laser light can be emitted from the outside of the visual field of the optical tube so that the laser probe does not obstruct the visual field, and a good image of the laser irradiation site can be obtained.

According to Supplementary Notes 1 to 9, by providing the laser reflecting surface at a position distant from the living tissue, deterioration and burning of the laser reflecting surface can be prevented. Further, by fixing the positional relationship between the laser reflection surface and the optical tube, the irradiation direction of the laser light can be adjusted easily and accurately.

According to Supplementary Note 3, the laser emitting angle and the emitting position can be freely adjusted, so that effective laser treatment suitable for various treatment targets can be performed. According to Supplementary Notes 10 to 12, by irradiating the laser beam in a state where the treatment target portion is taken in the opening of the laser probe, it is possible to perform a reliable laser treatment without unburned residue.

According to appendices 13 to 19, by using a laser probe having a plurality of laser emission portions and capable of arbitrarily setting the laser emission amount of each emission portion, an appropriate laser treatment according to the shape of the tissue to be treated can be obtained. It can be performed.

According to Supplementary Note 20, by providing a direction index indicating the emitting direction of the laser beam at the tip of the laser probe for irradiating the laser beam to the side, the emitting direction of the laser beam can be grasped easily and surely. The appropriate laser treatment can be performed.

[0045]

As described above, according to the present invention,
Laser light can be emitted from the outside of the visual field of the optical tube so that the laser probe does not obstruct the visual field, and a good image of the laser irradiation site can be obtained, effective,
There is an effect that efficient laser treatment can be performed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a laser endoscope showing a first embodiment of the present invention.

FIG. 2 is a side view and a front view of the distal end portion of the outer sheath of the same embodiment.

FIG. 3 shows a distal end portion of the laser endoscope according to the embodiment,
(A) is a vertical side view, and (b) is a sectional view taken along the line AA of (a).

4A and 4B show a usage state of the embodiment, FIG. 4A is a longitudinal side view, and FIG. 4B is a view showing an observation visual field.

FIG. 5 is a vertical cross-sectional side view of the distal end portion of the outer sheath showing the second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional side view of the distal end portion of the outer sheath showing a modification of the first embodiment of the present invention.

FIG. 7 is an exploded perspective view of a laser endoscope showing a third embodiment of the present invention.

FIG. 8 is a side view of the distal end portion of the outer sheath of the same embodiment.

FIG. 9 is a vertical cross-sectional side view of the distal end portion of the laser endoscope according to the embodiment.

FIG. 10 is a vertical cross-sectional side view of the laser endoscope of the embodiment in a used state.

11A and 11B show a usage state of the laser endoscope of the embodiment, FIG. 11A is a longitudinal side view, and FIG. 11B is a view showing an observation visual field.

FIG. 12 is a perspective view showing a laser probe.

FIG. 13 is a perspective view showing the laser probe.

FIG. 14 is a vertical cross-sectional side view of the laser probe in use.

FIG. 15 is a side view showing the tip of another laser probe.

FIG. 16 is a side view showing the tip of another laser probe.

FIG. 17 is an explanatory view of a usage state of the laser probe.

FIG. 18 is a side view showing the tip of another laser probe.

FIG. 19 is an explanatory view showing an endoscopic image of the laser probe in use.

20A and 20B show a conventional laser endoscope, in which FIG. 20A is a longitudinal side view of a used state, and FIG.

[Explanation of symbols]

1 ... Laser endoscope, 2 ... Outer sheath, 3 ... Inner sheath, 4
… Optical tube, 8… Laser probe, 9… Beak, 11
… Reflective surface.

Claims (1)

[Claims] 1. An optical viewing tube capable of obliquely observing a site to be observed, a laser probe provided in parallel with the optical viewing tube and on a side opposite to a visual field direction of the optical viewing tube, and the optical viewing tube. It is characterized by comprising a sheath through which a laser probe is inserted, and a laser reflecting surface which is provided at the distal end portion of the sheath and which guides the laser light emitted from the laser probe into the visual field of the optical tube. Laser endoscope.