JP2003116773A - Hood member mounting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hood member mounting tool capable of easily and accurately mounting a hood member at the distal end of an insertion tube/working length of an endoscope. SOLUTION: This hood member mounting tool is provided for mounting a removable hood member 50 on the distal end part 17 of an insertion tube/ working length 7 of the endoscope 2. The tool includes a hood member abutting part 56 for regulating the position of the hood member 50 and a distal end abutting part 57 for regulating the position of the distal end of the insertion tube/working length. When the hood member 50 is mounted on the distal end 17 of the insertion tube/working length, the mounting position of the hood member 50 to the distal end of the insertion tube/working length is regulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hood member mounting tool used when mounting a hood member on a distal end portion of an endoscope insertion portion.

[0002]

2. Description of the Related Art Conventionally, as an example of an endoscope apparatus used for surgery, one formed by disposing an objective lens, a light guide, an air / water feed port and a suction port at the distal end of the insertion portion of the endoscope. There is. In such an endoscope apparatus, light is applied from a light guide to a subject such as a biological tissue, the subject to which the light is applied is visually recognized through an objective lens, and air or water sent from an air / water feed port or other The substance can be sucked by the suction port.

However, when an endoscope is inserted into the stomach, for example, the mucous membrane of the stomach may come into contact with the objective lens provided at the distal end of the insertion portion of the endoscope so as to cover it, and the tip may not be visible. There were many.

In response to this, Japanese Patent Laid-Open No. 11-206
Japanese Patent No. 702 discloses an endoscope tip structure in which a guide portion is provided at the tip of the insertion portion of the endoscope to prevent the mucous membrane from covering the objective lens and losing the visual field. The guide portion of the tip structure of the endoscope is a hood-shaped member, and the inner peripheral surface is formed in a widened shape by drawing a radius from the tip surface of the tip portion.

However, Japanese Patent Laid-Open No. 11-206702
In the structure described in the publication, when the projection of the guide portion is long, when the objective lens is close to the guide portion, the viewing angle which has become widespread in recent years, the shape of the observation visual field is non-circular, and the viewing angle is wide. In the case of a videoscope that changes depending on the direction,
The guide part was visible in the visual field, and the observation performance was degraded. On the contrary, if the protruding length of the guide portion is shortened so that the guide portion does not enter the field of view, the effect of preventing the mucous membrane from covering the objective lens cannot be sufficiently obtained, and the insertability and the observation performance are deteriorated. .

[0006]

In an endoscope apparatus in which a hood member is detachably provided at the tip of an endoscope, the hood member is attached to the tip of the endoscope when the hood is attached to the tip of the endoscope. If the pushing amount is not enough, the hood member protrudes from the regular position, and the amount of the hood member visible in the observation field increases. On the contrary, when the hood member is attached so that the protruding length is shorter than the regular position, the effect of the hood member is reduced. In order to prevent this, even if the hood member is provided with a positioning portion in the axial direction, if the hood member is made of a soft material, the positioning portion will be deformed during mounting, and There were many cases where it could not be installed in the position.

Further, in the endoscope device in which the hood member is detachably formed at the distal end portion of the endoscope, when the hood member is formed in a shape adapted to the visual field, the rotation direction of the hood member is normal. There is a possibility that the hood member may be mounted at a position different from the position, and the hood member may be increased in the observation visual field.

In order to solve such a problem, if a positioning mechanism for the hood member is provided at the distal end portion of the endoscope insertion portion, there is a problem that the distal end portion of the endoscope insertion portion becomes complicated and becomes large in size. is there.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hood member mounting tool that allows a hood member to be easily and accurately mounted on the distal end portion of the insertion portion of an endoscope. .

[0010]

In order to achieve the above object, the hood member mounting device according to claim 1 is a hood member mounting device for mounting a detachable hood member on a distal end portion of an insertion portion of an endoscope. In the case where the hood member is attached to the insertion portion distal end portion, the hood member regulation means for regulating the position of the hood member, and the tip end portion regulation means for regulating the position of the insertion portion distal end portion are provided. The mounting position of the hood member with respect to the distal end portion of the insertion portion is regulated.

In the hood member mounting device according to a second aspect of the present invention, the hood member restricting means has a hood member axial direction restricting part for restricting an axial position of the hood member, and the tip end restricting means is the above-mentioned. It is characterized by having a distal end axial direction regulating portion for regulating the axial position of the insertion portion distal end portion.

In the endoscope apparatus according to a third aspect of the present invention, the hood member restricting means has a hood member rotation direction restricting part for restricting the position of the hood member in the rotating direction, and the tip end restricting means is the above-mentioned. It is characterized by having a distal end rotation direction restricting portion for restricting a position of the distal end portion of the insertion portion in the rotation direction.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 6 relate to a first embodiment of the present invention, and FIG. 1 is an explanatory view showing the overall configuration of an endoscope apparatus, and FIG. 2 is a distal end portion of the endoscope. FIG. 3 is a front view of the distal end portion of the endoscope, FIG. 4 is a side view showing a hood member detachably connected to the distal end portion of the endoscope, and FIG. 5 is an observation image displayed on a monitor. FIG. 6 is an explanatory view showing an observation visual field region when the observation image of FIG. 5 is displayed.

(Structure) FIG. 1 shows the entire structure of the endoscope apparatus. As shown in FIG. 1, the endoscope device 1 includes an endoscope 2 and
It is composed of a light source device 3, a video processor 5, and a monitor 6.

The endoscope 2 has an image pickup means described later.
The light source device 3 is detachably connected to the endoscope 2 and supplies illumination light to a light guide provided in the endoscope 2. The video processor 5 is connected to the endoscope 2 via the signal cable 4.
Is connected to control the image pickup means of the endoscope 2 and processes the signal obtained from the image pickup means. The monitor 6 displays an image corresponding to the subject image output from the video processor 5.

The endoscope 2 includes an insertion portion 7, an operating portion 8, a connecting cord 9, a connector portion 10 and an electric connector portion 11.
And have.

The insertion portion 7 has flexibility and is elongated. The operation portion 8 is connected to the base end side of the insertion portion 7. The connection cord 9 has flexibility and extends from the side portion of the operation unit 8. The connector portion 10 is provided at the end of the connecting cord 9 and is detachably connected to the light source device 3. The electric connector portion 11 is provided on a side portion of the connector portion 10, and the signal cable 4 connected to the video processor 5 can be detachably connected.

The electric connector portion 11 is provided with a ventilation portion (not shown) that communicates the inside and outside of the endoscope 2.

At the connecting portion between the inserting portion 7 and the operating portion 8, there is provided an inserting portion side fold prevention member 12 having an elastic member for preventing abrupt bending of the connecting portion. A connecting portion between the operating portion 8 and the connecting cord 9 is also provided with an operating portion side anti-folding member 13 similar to the insertion portion side anti-folding member 12. Further, a connector portion side fold prevention member 14 similar to the insertion portion side fold prevention member 12 is also provided at the connecting portion between the connecting cord 9 and the connector portion 10.

The insertion portion 7 is arranged in order from the base end side of the flexible tube portion 1.
5, the bending portion 16 and the tip portion 17 are connected to each other.

The flexible tube portion 15 has flexibility and is formed softly. The bending portion 16 is provided on the distal end side of the flexible tube portion 15 and can be bent by operating the operation portion 8. The distal end portion 17 is provided with an observation optical system, an illumination optical system, and the like, which will be described later, provided at the distal end.

As shown in FIGS. 2 and 3, the tip portion 17 has an air / water feed nozzle 18 which is an air / water feed port.
A suction port 19, a liquid feed port 20, an observation optical system 34,
The illumination optical system 35 is provided.

The air / water supply nozzle 18 ejects the cleaning liquid or gas toward the optical member on the outer surface of the observation optical system 34.
The suction port 19 is an opening on the distal end side of the treatment instrument channel for inserting the treatment instrument arranged in the insertion section 7 and sucking the liquid in the body cavity. The liquid supply port 20 is open toward the observation target and serves as an opening for ejecting the liquid toward the observation target.

As shown in FIG. 1, the connector portion 10 includes
A gas supply base 21, a water supply tank pressure base 23, a liquid supply base 24, a suction base 25, an injection base 26, and a ground terminal base 27 are provided.

The gas supply base 21 is detachably connected to a gas supply source (not shown) incorporated in the light source device 3. The water supply tank pressurizing mouthpiece 23 and the liquid supply mouthpiece 24 are detachably connected to the water supply tank 22 which is a liquid supply source. The suction cap 25 is connected to a suction source (not shown) for performing suction from the suction port 19 shown in FIG. The inlet gold 26 is shown in FIG.
It is adapted to be connected to a water supply means (not shown) for supplying water from the liquid supply port 20 shown in FIG. Ground terminal base 2
When a high frequency leakage current is generated in the endoscope 2 by performing a high frequency treatment or the like, 7 returns the leakage current to the high frequency treatment device.

The operation section 8 has an air / water supply operation button 28.
A suction operation button 29, a bending operation knob 30, a plurality of remote switches 31, and a treatment instrument insertion opening 32 are provided.

The air supply / water supply operation button 28 is an operation unit for performing an air supply operation or a water supply operation, and when pressed by an operator, air supply / water supply can be performed from the air supply / water supply nozzle 18 shown in FIG. It is like this. Suction operation button 2
Reference numeral 9 denotes an operation unit for performing a suction operation, which can be sucked by the suction port 19 shown in FIG. 3 when pressed by the operator. The bending operation knob 30 is an operation portion for performing a bending operation of the bending portion 16.
The plurality of remote switches 31 serve as an operation unit for remotely operating the video processor 5. The treatment instrument insertion port 32 is an opening on the proximal end side that communicates with the treatment instrument channel.

A waterproof cap 33 for liquid-tightly sealing the electric connector 11 can be detachably connected to the electric connector 11 of the endoscope 2.

Next, the hood member 37 which is an essential part of the present invention will be described. As shown in FIGS. 2 and 3, the endoscope 2
The hood member 37 is detachably connected to the distal end portion 17 of the insertion portion 7.

That is, the hood member 37, while being fixed to the distal end portion 17, prevents the leading edge lens of the observation optical system 34 exposed on the distal end surface of the distal end portion 17 from directly contacting the inner wall of the body cavity, This is for preventing the visual field of the endoscope 2 from being lost.

The hood member 37 may be formed of a vulcanized rubber such as silicone rubber or fluororubber, a soft member such as a thermoplastic elastomer such as a urethane elastomer, an acrylic elastomer, an olefin elastomer or a hard resin such as polysulfone. It is possible. In the present embodiment, the hood member 37 is formed of a flexible member.

The hood member 37 has a protruding portion 38 and an endoscope fixing portion 39. The protruding portion 38 is formed in a petal shape, and protrudes in the front direction of the field of view from the tip portion 17. The endoscope fixing portion 39 is formed in a tubular shape, and is provided on the base end side of the protruding portion 38.

The inner diameter of the endoscope fixing portion 39 is formed to be substantially the same as or slightly smaller than the outer diameter of the distal end portion 17 and is elastically deformable. As a result, the distal end portion 17 of the endoscope fixing portion 39 can be press-fitted.

A taper portion 45 is provided on the outer periphery of the base end portion of the endoscope fixing portion 39. The taper portion 45 reduces the step at the base end portion and thins the base end portion to facilitate elastic deformation, so that the distal end portion 17 can be easily press-fitted into the endoscope fixing portion 39. .

The tightening ratio at the time of press fitting does not come off due to the friction with the wall of the body cavity in the examination, and the fixing strength is such that it can be easily attached / detached at the time of attachment / detachment. Specifically, the loading / unloading amount is set to about 5 to 20N.

The length of the endoscope fixing portion 39 is such that the end portion of the endoscope fixing portion 39 does not reach the position of the pivot pin 36 on the most distal end side of the bending portion 16 when mounted on the distal end portion 17. It is formed as long as possible. Thereby, the endoscope fixing portion 39 secures the fixing by increasing the fitting length with the distal end portion 17 as much as possible within the range that does not affect the bending operation of the bending portion 16.

Between the endoscope fixing portion 39 and the projecting portion 38, there is provided a tip portion abutting portion 40 which projects to a diameter smaller than the outer diameter of the tip portion 17.

The tip surface of the tip portion 17 has a tip contact portion 40.
The tip 17 and the hood member 37 can be positioned in the axial direction. The tip contact portion 4
0 should be on a part of the circumference, not on the whole circumference.

As shown in FIG. 3, the tip end contact portion 40 is partially provided with a rotational direction positioning portion 41 protruding inward.

The rotation direction positioning portion 41 is provided with a nozzle engaging groove 42 which is cut out in a concave shape. The air / water supply nozzle 18 is engaged with the nozzle engagement groove 42, and the engagement allows the tip 17 and the hood member 37 to be positioned in the rotational direction about the axis of rotation.

On the inner peripheral surface side of the projecting portion 38, there is provided a slope-shaped slope portion 44 that expands in diameter from the tip contact portion 40 toward the tip side of the projecting portion 38. This allows
On the inner peripheral surface side of the protruding portion 38, water, body fluid, dirt, etc. attached to the surface of the tip portion 17 easily flow to the outside of the protruding portion 38,
It is difficult for these to accumulate.

As shown in FIGS. 3 and 4, the tip edge portion 43 of the projecting portion 38 corresponds to the observation visual field area of the observation optical system 34 so that the tip edge portion 43 is less visible in the observation image. It is formed in the shape.

As shown in FIG. 5, the observation image 46 displayed on the monitor 6 has a substantially square shape.

FIG. 6 shows an observation visual field region when displaying such an observation image 46. The surface A1 is the most advanced lens surface of the observation optical system 34 shown in FIG. 3, and the surface B1 is an imaginary surface about 4 mm from the lens surface.

The observation visual field range on the surface A1 is a region a1, and the observation visual field range on the surface B1 is a region b1.

The space sandwiched between the areas a1 and b1 becomes the observation visual field area 47. At this time, the observation visual field region 4
The lateral surface of 7 is a slope 48 formed from a set of rays.

As shown in FIG. 5, since the diagonal length L2 is longer than the diagonal length L1 in the observed image 46, the diagonal viewing angle is larger.

Further, in the observation optical system 34 normally used for the endoscope 2, due to its characteristics, the image is compressed more at a position farther from the center due to the aberration of the optical system.

Therefore, in the case of the shape of the observed image 46 shown in FIG. 5, the shape of the region b1 is changed to the observed image 4 as shown in FIG.
6 does not have the same shape, and the area in the diagonal direction X becomes large. Therefore, the shape of the slope 48 is uneven.

As shown in FIGS. 2 and 4, the tip edge portion 43
Is formed in a shape corresponding to the slope 48, and in the figure, the upper edge 43 and the shaded portion 43a shown in FIG. 3 have the slope 48 shown in FIG. 6 at the respective positions. The shape is substantially the same as the shape, or, as shown in FIGS. 2 and 4, a slope portion 49 is formed at a position where the shape of the slope 48 is slightly offset.

As shown in FIGS. 3 and 4, the tip edge portion 43 has an uneven shape reflecting the shape of the inclined surface 48 described above. In this case, the tip edge portion 43 is the A portion, the B
The parts, C, and D are convex, and the E, F, G, and H are concave.

When the projection 38 has a concave portion and unevenness occurs, it is desirable that the projection length be long as a convex portion in the vicinity of the observation optical system 34. Further, it is desirable that there are three or more convex portions.

In the concave portions E, F, G and H, the slope portion 44 is connected to the slope 48 and is an opening toward the outside. Mucus and dirt that enter the inside of the protrusion 38, water supplied from the air / water supply nozzle 18, and the like are discharged from the recesses to the outside of the protrusion 38 via the slopes 44. As a result, the field of view is not obstructed by dirt or mucus.

As shown in FIG. 4, a chamfer 71 having a radius of about 0.3 to 1 mm is formed on the outer peripheral edge of the front edge 43. R0.3 to 1 mm at the tip end of the slope 49
A degree of chamfer 72 is formed.

As shown in FIG. 2, the observation depth of the observation optical system 34 is set to 4 mm to 100 mm, and the protrusion at the position where the amount of protrusion of the tip edge portion 43 from the most advanced lens of the observation optical system 34 is the largest. The quantity L0 is formed to be substantially equal to or longer than the minimum value (near point) of this depth. In this embodiment, the tip edge portion 43 has a protrusion amount L0.
Is formed so as to be about 4 mm.

With such a structure, in the endoscope apparatus 1 of the present embodiment, the protruding portion 38 protruding in the observation visual field direction of the endoscope 2 is provided at the tip portion 17 of the insertion portion 7 of the endoscope 2. The hood member 37 having the above is provided, and the observation image 46 of the endoscope 2 is provided.
Has a non-circular shape.

Further, in the endoscope apparatus 1, the inclined surface portion 49 having a shape corresponding to the observation visual field region 47 of the endoscope 2 is formed at the tip edge portion 43 of the protruding portion 38.

(Operation) When the hood member is transparent, the illumination light is not blocked by the hood member, so that the illumination performance is good.

The hood member may be black. In this case, the protrusion may be provided with a notch and a slope portion in the same manner as the observation visual field region, in accordance with the irradiation region of the emitted light of the illumination optical system.

In the case of a black color, the illumination light is not reflected by the inner wall of the hood member as compared with a transparent color, so that halation caused when using a treatment tool can be prevented.

Further, the color may be matched with the applicable interior mirror and the hood member, and the color may be changed with the non-applicable mirror. or,
In order to facilitate the removal of the tip portion and the hood member, these colors may be different so that they can be easily recognized.

The hood member may display the model name of the endoscope to which it is applicable and the outer diameter of the tip of the endoscope.

The protrusion amount of the protrusion can be set to about 2 mm to 10 mm. 7 and 8 are explanatory views for explaining the operation of the protrusion 38 of the first embodiment.

In FIG. 7, the solid line shows the shape of the protruding portion 38 of the present embodiment, and the broken line keeps the protruding length of the protruding portion 38, and the chamfers 71 and 7 are formed without providing the inclined surface portion 49.
The shape of the protrusion 38 when forming the shape of 2 is shown. When the protrusion 38 is formed as shown by the broken line, the thickness of the protrusion 38 becomes thin.

That is, in this embodiment, the observation visual field region 4
8 is provided, the wall thickness of the protrusion 38 is increased without shortening the protrusion length of the protrusion 38. Thereby, in the present embodiment, it is possible to make the protruding portion 38 less likely to be damaged, and even when the protruding portion 38 has a plurality of cutout shapes, when the protruding portion 38 is pressed against the inner wall of the body cavity. It can be prevented from being deformed. Further, in this embodiment, since the chamfers 71 and 72 can be formed large,
Insertability is improved.

In FIG. 8, the solid line shows the shape of the protrusion 38 of the present embodiment, and the broken line shows the slope 38 of the protrusion 38.
9 shows the shape when the wall thickness is secured without providing 9. When the protrusion 38 is formed as shown by the broken line, the protrusion length of the protrusion 38 becomes short.

That is, in this embodiment, the protruding length of the protruding portion 38 can be increased without increasing the outer diameter, and the performance of the hood is improved.

Even when the mucous membrane is in contact with the distal edge portion 43 and covers the entire visual field, the protrusion amount L0 of the distal edge portion 43 shown in FIG. By making the value larger than the value of, the observation optical system 34 is focused on the mucous membrane of the tip edge portion 43, and the observed image becomes clear.

(Effect) As described above, according to the present embodiment, the hood member 37 is thin, the hood member 37 is not easily damaged, the insertability is good, and the hood member 37 is less visible in the observation image, and the observation performance is improved. It is possible to provide a good endoscope apparatus. or,
According to the present embodiment, it is possible to provide an endoscope device with good observation performance even when the hood member 37 contacts the mucous membrane.

In the present embodiment shown in FIGS. 1 to 6, the index for aligning the position of the hood member 37 in the rotation direction is, for example, the tip edge portion 43 without the nozzle engaging groove 42. It may be provided in. At this time, as a mark on the side of the tip 17 for adjusting the index, an index may be attached also on the side of the tip 17, or the mark may be adjusted to the air / water supply nozzle 18, the suction port 19 or the observation optical system 34 of the tip 17. Also good.

When the hood member 37 is separate from the endoscope 2, the attachment position of the hood member 37 and the appearance in the observed image are likely to vary, but the observing visual field region corresponds to each position. By providing the inclined surface portion, the projection length is formed as long as possible, so that the projection length can be ensured to be long even if there is variation.

Further, according to the present embodiment, the hood member 37 is attached with the inclined portion arranged at an appropriate position according to the observation visual field region by providing the axial direction and rotational direction positioning means and the index. You can easily do that.

(Second Embodiment) FIG. 9 shows a second embodiment of the present invention.
FIG. 4 is a side view showing a distal end portion of the endoscope according to the embodiment of the present invention with a part thereof cut away.

(Structure) A hood member 1 is different from the first embodiment shown in FIG. 2 in the second embodiment shown in FIG.
37 is formed integrally with the tip portion 17.

As shown in FIG. 9, the hood member 137 is made of a hard resin such as polysulfone and also serves as an insulating cover for covering the metal part 117 inside the tip portion 17.

The observation optical system 34 of the tip portion 17 has an observation visual field region 47 similar to that of the first embodiment shown in FIG.

At the tip edge 143 of the hood member 137,
A slope portion 149 corresponding to the slope 48 of the observation visual field region 47 is provided at each position.

The tip edge portion 143 of the hood member 137 is provided with a slope portion 149 corresponding to the slope 48 of the observation visual field region 47 at each position as in the first embodiment shown in FIGS. 1 to 6. ing.

Further, at the outer peripheral edge of the front edge 143, R is formed.
A chamfer 71 of about 1 mm is formed.

In the present embodiment, the slope portion 149 is formed as wide as possible, and the wall thickness of the tip edge portion 143 is formed as large as possible (operation) When the hood member 137 is formed integrally with the tip portion 17, From the viewpoint of resistance to breakage and abrasion, the hard member has better durability than the soft member.

When the hood member 137 is formed of a hard member, the tip edge portion 143 is more likely to be damaged by an impact or the like than when it is formed of a soft member. However, in the second embodiment, the tip edge portion 143 is damaged. Since the wall thickness of 143 can be formed thick and the chamfer 71 can have a large R shape, even if it is hard, it can be made difficult to be damaged sufficiently.

(Effects) As described above, according to the second embodiment, the same effects as those of the first embodiment shown in FIGS. 1 to 6 are obtained, and the hood member 137 is replaced by the hard member. Even when it is formed by, it is possible to make it hard to break.

(Third Embodiment) FIGS. 10 and 11 relate to a third embodiment of the present invention. FIG. 10 is a side view showing a projecting portion of a distal end portion of an endoscope, and FIG. 11 is a monitor. It is a top view which shows the observation image displayed on.

(Structure) As shown in FIG. 10, in the projecting portion 238 of the hood member 237 provided at the distal end portion of the endoscope of the present embodiment, the distal end edge portion with respect to the slope 48 of the observation visual field region 47. It has a portion 243a in which the tip end portion of 243 is formed in a shape overlapping by a small amount. That is, part 24
3a protrudes into the observation visual field region 47.

Then, the overlapping amount x of the leading edge portion 243 with respect to the observation visual field region 47 in the range of the distal value from the center of the observation visual field in the diagonal direction X shown in FIG. 6 is larger than the overlapping amount y at other positions. Is also formed large. That is, as shown in FIG. 11, the overlapping amounts x and y are formed so that the visible amount of the leading edge portion 243 on the observed image 46 is uniform in consideration of the aberration of the observation optical system 34. .

(Operation) In the present embodiment, the image is most compressed by the aberration of the observation optical system 34 in the range of the value distal to the center of the observation field in the diagonal direction X shown in FIG. Therefore, as shown in FIG. 11, in the observation image 46 of the monitor 6, the images 243b, 2 of the tip edge portion 243 which are projected from the slope 48 in the diagonal direction X and overlap the observation visual field region 47.
43c is compressed. As a result, the images 243b and 243c of the leading edge 243 have no significant difference in the appearance on the observed image 46 from the image 243d of the leading edge 243 that overlaps the observation visual field region 47 at other positions.

Therefore, it is possible to form the projection length or the wall thickness of the hood member 237 to be large while minimizing the influence on the observation visual field.

(Effects) As described above, according to the present embodiment, the same effects as those of the embodiment shown in FIGS. 1 to 6 are obtained, and further, the protruding length of the hood member 237 is increased or the thickness is increased. It is possible to provide an endoscope apparatus having a large thickness and good insertability or durability.

(Fourth Embodiment) FIG. 12 is a plan view showing an observation image displayed on a monitor according to a fourth embodiment of the present invention. The shape of the protruding portion of the distal end portion of the endoscope according to the fourth embodiment will be described with reference to FIG.

(Structure) In the present embodiment, the distal end portion of the distal edge portion 243 with respect to the slope 48 of the observation visual field region 47 shown in FIG. Has a portion formed in a shape overlapping by a very small amount. As a result, as shown in FIG.
In the observation image 46 of No. 24, the image 24 of the tip edge portion 243 that protrudes from the slope 48 in the diagonal direction X and overlaps the observation visual field region 47.
3b, 243c and 243e are displayed.

(Operation) In the present embodiment, the monitor 6
In the observation image 46, the field of view in the diagonal direction X having a high compression rate and a large angle of view is slightly reduced, but the field of view is small in other portions having a low compression rate and originally having a small field angle. The hood member 237 can be formed to have a large protruding length or a large wall thickness.

(Effect) As described above, according to the fourth embodiment, the same effect as that of the third embodiment shown in FIGS. 10 and 11 can be obtained, and the observation performance can be further improved. An endoscope apparatus can be provided.

In the first to fourth embodiments, it is assumed that the shape of the observed image is non-circular.
The present invention can be applied to an endoscopic device having an observation image as shown in FIGS. 3, 14, 15, and 16.

FIG. 13: Observed image 46 is a square or a rectangle, and is a quadrangle that is rounded at the corners. FIG. 14: A quadrangle in which the observed image 46 is displayed on the entire screen of the monitor 6. FIG. Shaped quadrangle FIG. 16: Shaped quadrangle cut out from the top, bottom, left and right of a circle (fifth embodiment) FIGS.
17 is a cross-sectional view showing a hood member, FIG. 18 is a cross-sectional view showing a hood member mounting tool to which the hood member is attached, and FIG. 19 is a hood member mounting tool using the hood member mounting tool of FIG. FIG. 20 is a cross-sectional view showing a state in which the endoscope is attached to the distal end portion of the endoscope, and FIG. 20 is a cross-sectional view showing a state in which the hood member attachment is removed from the state of FIG.

(Structure) As shown in FIG. 17, the hood member 50 has a substantially cylindrical shape and is attachable to and detachable from the distal end portion of the endoscope. The hood member 50 can be formed of a vulcanized rubber such as silicone rubber or fluororubber, a soft member such as a thermoplastic elastomer such as a urethane elastomer, an acrylic elastomer, an olefin elastomer or a hard resin such as polysulfone. . In the present embodiment, the hood member 50 is formed of a flexible member.

The hood member 50 is provided with a protruding portion 51 and an endoscope fixing portion 52. The inner diameter of the endoscope fixing portion 52 of the hood member 50 is equal to that of the distal end portion 17 of the endoscope shown in FIG.
The outer diameter is substantially the same as or slightly smaller than the outer diameter.
As a result, the distal end portion 17 of the endoscope fixing portion 52 is formed by elastic deformation so that the distal end portion 17 can be press-fitted.

As shown in FIG. 18, the hood member fitting 5
3 is for attaching the detachable hood member 51 to the distal end portion 17 of the insertion portion of the endoscope.

The hood member fitting 53 is provided with a hood member fixing portion 54 and a grip portion 55.

The outer diameter of the hood member fixing portion 54 is equal to that of the protruding portion 51.
Is formed to have substantially the same inner diameter as that of. As a result, the protruding portion 51 can be fitted onto the hood member fixing portion 54.

A hood member contact portion 56 is provided at the base end of the hood member fixing portion 54. Hood member fixing part 5
A tip end abutting portion 57 is provided on the tip end side of 4.

Hood member contact portion 56 and tip end contact portion 57
When the hood member 50 is attached to the distal end portion 17, the length L11 between and can allow the amount of the hood member 50 visible in the observation field, and the effect of the hood member 50 shown in FIG. 20 is maximized. Such an optimum amount is set to be the same as the protrusion amount L12 of the protrusion 51 from the tip portion 17. With such a structure, the hood member abutting portion 56 is provided with the hood member 50.
Is a hood member restricting means for restricting the position of the hood member, the tip end contact portion 57 is a distal end part restricting means for restricting the position of the tip end portion 17, and the hood member mounting tool 53 sets the hood member 50 at the tip end part. When mounted, the tip 17
The mounting position of the hood member 50 with respect to is regulated.

(Operation) When the hood member 50 is attached to the tip portion 17, the hood member fixing portion 5 of the hood member attachment 53 is attached to the protruding portion 51 of the hood member 50 as shown in FIG.
4 is inserted until the hood member contact portion 56 and the tip of the protrusion 51 abut.

Next, as shown in FIG. 19, the hood member 50.
The distal end portion 17 is press-fitted into the endoscope fixing portion 52 and is inserted until the distal end abutting portion 57 and the distal end portion 17 abut.

When the tip end contact portion 57 and the tip end portion 17 hit each other and the hood member contact portion 56 hits the tip end portion of the protrusion 51, as shown in FIG. Remove.

Also, they may be mounted in the following order. First,
The tip portion 17 is press-fitted into the endoscope fixing portion 52 of the hood member 50 by an appropriate amount. After that, the hood member fixing portion 54 of the hood member attachment 53 is inserted into the protruding portion 51 of the hood member 50.

Next, the hood member contact portion 56 and the protruding portion 51.
After adjusting the position of the hood member 50 so that the tip end of the hood member abuts and the tip end contact portion 57 and the tip end portion 17 abut, the hood member mounting tool 53 is removed.

As described above, as shown in FIG. 20, the hood member 50 is fixed to the front end portion 17 with its axial position defined so as to have a proper protrusion amount L12 with respect to the front end portion 17.

(Effect) As described above, according to the fifth embodiment, it is possible to reliably and easily define the axial position of the hood member 50 and attach the hood member 50 to the distal end portion 17, and the observation performance is good. Hood member mounting tool 53 for easy mounting of the hood member
Can be provided.

(Sixth Embodiment) FIG. 21 shows a sixth embodiment of the present invention.
It is explanatory drawing which shows the hood mounting method using the hood member mounting tool which concerns on embodiment.

(Structure) As shown in FIG. 21, the three types of endoscopes 2a, 2b, and 2c have respective distal end portions 17a and 17a.
The outer diameters of b and 17c are substantially the same.

On the other hand, these are the tip portions 17a, 17b, 1
7c is an observation optical system 34 and an illumination optical system 3 shown in FIG.
5, the layout of the air / water supply nozzle 18, the suction port 19 and the like are different.

The monitor 6 shown in FIG. 1 may differ due to the difference in the configuration of the lens (not shown) constituting the observation optical system 34, the difference in CCD, the display shape of the observation image 46 on the monitor 6 under the control of the video processor 5, and the like. The observation visual field regions of the observation image displayed in are different from each other.

Therefore, one type of hood member 50a is used as
When the protrusions 51 are attached to the tip portions 17a, 17b, and 17c of the same type and the protrusion amounts of the protrusion portions 51 from the tip portion 17 are the same, the amounts of the hood members 50a that are seen in the observed images are different.

On the other hand, the hood member 50a includes the endoscopes 2a, 2
It can be commonly used for each of b and 2c.

The hood member 50a is attached to the tip portions 17a, 17
b, 17c, the amount of the hood member 50 visible in the observed image is acceptable, and the optimum projection amount L12 that maximizes the effect of the hood member is set to the endoscopes 2a, 2
Unique in combination with b, 2c. These are designated as L12a, L12b, and L12c, respectively.

When the hood member 50a is attached to the endoscopes 2a, 2b, 2c, dedicated hood member attachments 53a, 53b, 53c are used.

Hood member fittings 53a, 53b, 53c
The lengths L11a, L11b, L11c between the hood member contact portion 56 and the tip end contact portion 57 are formed in the same amount as the protrusion amounts L12a, L12b, L12c, respectively.

Display portions 58a, 58 on which the name and model number of each endoscope, the name and model number of the hood member 50a, the manufacturer name, etc. are displayed on the grip portion 55 by molding or printing.
b and 58c are provided.

(Operation) When mounting the hood member 50a, the contents of the display 58 are confirmed and the hood member mounting tool corresponding to each endoscope is selected.

The procedure of mounting is the same as that of the fifth embodiment shown in FIG. In each of the endoscopes 2a, 2b, 2c, the hood member 50a has a distal end portion 17a, 17b, 17c.
With respect to each of the appropriate protrusion amounts L12a, L12b,
An axial position is defined and fixed to L12c.

(Effects) According to the sixth embodiment as described above, in addition to the same effects as the fifth embodiment shown in FIGS. 17 to 20, a common hood member is used for a different endoscope. It can be mounted at an optimum position on each of the tip portions of the.

(Seventh Embodiment) FIG. 22 shows a seventh embodiment of the present invention.
FIG. 9 is a cross-sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope by using the hood member attachment according to the embodiment of the present invention. In FIG. 22, the same components as those of the embodiment of FIG. 19 are designated by the same reference numerals and the description thereof is omitted.

(Structure) As shown in FIG. 22, the hood member mounting member 353 is provided with a cylindrical outer diameter restricting portion 59.

The inner diameter D1 of the outer diameter restricting portion 59 is equal to the hood member 5
The outer diameter D2 of the protruding portion 51 of 0 is substantially the same, and the outer diameter restricting portion 59 is formed so that the protruding portion 51 can be inserted.

(Operation) When the hood member 50 is attached to the hood member attachment 353, the protruding portion 5 of the hood member 50
1 is inserted between the hood member fixing portion 54 and the outer diameter regulating portion 59.

Next, as in the case of FIG. 19, the distal end portion 17 is press-fitted into the endoscope fixing portion 52 of the hood member 50, and then the hood member attachment 353 is removed from the hood member 50. Thereby, as in the case of FIG. 20, the hood member 5
0 is attached and fixed to the tip portion 17.

FIG. 23 is an explanatory view for explaining the operation when the hood member 50 is mistakenly set in the opposite axial direction and is attached to the hood member attachment 353 and then attached to the distal end portion 17.

As shown in FIG. 23, contrary to the original case, the endoscope fixing portion 52 of the hood member 50 is inserted between the hood member fixing portion 54 and the outer diameter restricting portion 59.

In this state, next, even if the tip portion 17 is pressed into the protruding portion 51 of the hood member 50, the protruding portion 5
The inner diameter of 1 is smaller than the inner diameter of the endoscope fixing portion 52 and the outer diameter of the distal end portion 17, and the outer diameter restricting portion 59 prevents the protruding portion 51.
Since the deformation of the protrusion 51 is restricted, the diameter of the protrusion 51 cannot be increased and the tip 17 cannot be press-fitted.

As a result, it is possible to prevent the hood member 50 from being attached to the tip portion 17 contrary to the original situation.

FIG. 24 is an explanatory view for explaining the operation when the hood member 50 is attached to the tip portion 17 first by mistakenly making the axial direction of the hood member 50 the opposite direction.

As shown in FIG. 24, the tip portion 17 is press-fitted into the protruding portion 51 of the hood member 50 by an appropriate amount.

At this time, the inner diameter of the protruding portion 51 is not appropriate for the outer diameter of the tip portion 17, but there is a possibility that the hood member 50 will be elastically deformed and expanded in diameter before being mounted.

Next, the endoscope fixing portion 52 of the hood member 50.
When trying to insert the hood member fixing portion 54 of the hood member attachment 353 into the
Since it has expanded and deformed, it cannot hit the outer diameter restricting portion 59 and be inserted.

As a result, it is possible to prevent the hood member 50 from being attached to the tip portion 17 in the direction opposite to the original direction.

(Effect) According to the seventh embodiment as described above, in addition to the same effects as the fifth embodiment shown in FIGS. 17 to 20, the hood member is reversed in the axial direction to cause an error. It is possible to prevent wearing.

(Eighth Embodiment) FIGS. 25 and 26 relate to an eighth embodiment of the present invention, and FIG. 25 is a cross-sectional view showing a closed state of a hood member mounting tool to which a hood member is attached, FIG. 26 is a perspective view showing a state in which the hood member attachment is opened.

(Structure) As shown in FIGS. 25 and 26,
The hood member attachment 453 also serves as a packaging container for the hood member 50.

The hood member mounting member 453 includes the main body 62,
It has a lid-shaped accommodating portion 63 and a hinge portion 64 connecting them.

The hood member fitting 453 is made of a resin member which can be sterilized by ethylene oxide gas sterilization, autoclave sterilization, gamma ray sterilization and the like.
For example, the hood member attachment 453 is made of polystyrene that can be sterilized with ethylene oxide gas.

The body portion 62 is provided with a hood member fixing portion 54 similar to that shown in FIG. 18, and the hood member 50 is fixed in advance.

The outer diameter of the hood member fixing portion 54 is equal to the protruding portion 51.
The hood member fixing portion 54 is press-fitted into the protruding portion 51. The protruding portion 51 is fixed to the hood member fixing portion 54 by its own elastic force. The outer diameter of the hood member fixing portion 54 is dimensioned so that the fixing force between the protruding portion 51 and the hood member fixing portion 54 becomes smaller than the fixing force between the endoscope fixing portion 52 and the distal end portion 17 shown in FIG. It is set. Further, the body portion 62 is provided with a hood member contact portion 56 and a tip end contact portion 57 similar to those shown in FIG.

The main body 62 is provided with a convex portion 65, and the accommodating portion 63 has a locking portion 66 for removably locking the convex portion 65.
Is provided.

In the hood member mounting member 453, the convex portion 65 is engaged with the engaging portion 66 to be engaged therewith, whereby the main body portion 62.
The housing portion 63 is locked, and the hood member 50 is housed by these as shown in FIG.

The hood member attachment 453 is housed in a peel pack or the like that can be sterilized as described above and can keep the sterilized state of the contents for a certain period of time, and sterilized in this state and delivered to the user. To be

(Operation) When the hood member 50 is attached to the tip portion 17 shown in FIG. 19, the peel pack is opened and the hood member attachment 453 in the state shown in FIG. 25 is taken out, as shown in FIG. Then, the main body 62 and the accommodating portion 63 are unlocked to expose the hood member 50. The hood member attachment 453 keeps the hood member 50 sterile until this time.

Next, the distal end portion 17 shown in FIG. 19 is inserted into the endoscope fixing portion 52, and the hood member 50 is positioned and fixed to the distal end portion 17 in the same manner as in the fifth embodiment, and the hood member is fixed. The mounting tool 453 is removed from the hood member 50. At this time, the outer diameter of the hood member fixing portion 54 is set so that the fixing force between the protruding portion 51 and the hood member fixing portion 54 is smaller than the fixing force between the endoscope fixing portion 52 and the distal end portion 17. Therefore, even if the hood member 50 is not gripped with fingers, the hood member attachment 453 can be detached from the hood member 50 without shifting the positions of the hood member 50 and the tip end portion 17.

As described above, the hood member 50 is mounted on the distal end portion 17 without removing the hood member 50 from the hood member mounting device 453 with fingers and without touching the hood member 50.

(Effect) According to the eighth embodiment as described above, in addition to the same effect as the fifth embodiment shown in FIGS. 17 to 20, the hood member is attached to the hood member attachment before the inspection. It can be installed more easily because it saves the trouble of attaching to.
Further, since the hood member is previously fixed to the hood member mounting tool, it is possible to prevent the hood member from being erroneously mounted in the opposite axial direction. Furthermore, the hood member can be easily kept clean until just before using the endoscope.

(Ninth Embodiment) FIG. 27 is a view showing a state in which the hood member is attached to the distal end portion of the endoscope by using the hood member mounting tool according to the ninth embodiment of the present invention. It is a figure.

(Structure) As shown in FIG. 27, the ridge line of the tip abutting portion 68 on the tip side of the projecting portion 551 of the hood member 67 is formed in a petal-shaped shape according to the observed image.

A hood member abutting portion 556 having substantially the same shape as the tip abutting portion 68 is provided on the proximal end side of the hood member fixing portion 554 of the hood member attaching device 69.

A tip contact portion 557 is provided on the tip side of the hood member fixing portion 554. Hood member fixing part 5
The column 54 is provided with a cylindrical rotation direction restricting portion 70 protruding from the tip end contact portion 557.

The outer diameter of the rotation direction restricting portion 70 is substantially the same as the inner diameter of the suction port 19 provided in the tip portion 17 and is formed so that it can be fitted into the suction port 19.

(Operation) When the hood member 67 is attached to the hood member attachment 69, the tip abutting portion 68 of the hood member 67 is attached to the hood member abutting portion 556 having substantially the same shape as the tip abutting portion 68. The tip abutting part 6 so that it comes to the corresponding position
8 and the hood member contact portion 556 are brought into contact with each other. As a result, the position of the hood member 67 in the rotation direction with respect to the hood member attachment 69 is set to a predetermined position.

Next, the hood member mounting tool 69 and the distal end portion 17 are aligned in the rotational direction so that the suction port 19 of the endoscope 2 and the rotational direction restricting portion 70 are fitted to each other, and the distal end portion 17 and the distal end portion are aligned. The hood member 67 at the position where the hood member 67 is brought into contact with the hood member 67.
Is fixed to the tip portion 17.

As a result, the hood member contact portion 556 regulates the rotational positions of the hood member 67 and the hood member mounting tool 69, and also regulates the axial position thereof.

On the other hand, the positions of these in the rotational direction are regulated by the fitting of the endoscope fixing portion 552 and the distal end portion 17 and the fitting of the rotation direction regulating portion 70 and the suction port 19. Further, the contact between the tip end contact portion 557 and the tip end portion 17 restricts their axial positions.

As described above, the tip abutting portion 68 becomes the tip portion 1
The position in the axial direction is defined at a position that provides an appropriate protrusion amount L31 with respect to 7, and the position in the rotational direction is regulated and mounted in a state corresponding to the observed image.

(Effect) According to the ninth embodiment as described above, the position of the tip abutting portion 68 in the axial direction and the rotation direction can be defined reliably and easily, and the tip abutting portion 68 can be attached to the tip portion 17 to improve the observation performance. It is possible to provide a hood member mounting tool that easily mounts the hood member.

The rotation direction restricting portion 70 has the suction port 1
The rotation direction regulating portion 70 is provided with a rotation direction regulating portion that engages with the air / water nozzle 18 projecting from the tip surface of the tip portion 17. It is also possible to provide a rotational position regulating portion that engages with a concave portion such as the suction port 19 or a convex portion such as the air / water feeding nozzle 18 that is provided at a position other than the center of the distal end surface of the distal end portion 17 as described above. Just go.

As a result, it is not necessary to provide a restricting portion for restricting the position in the rotational direction on the outer peripheral portion of the tip end portion 17, and a complicated restricting portion need not be newly provided.

Further, since a new structure for positioning is not required on the endoscope 2 side, it can be applied to the existing endoscope 2 and has high versatility.

It should be noted that the concave portion or the convex portion is provided at the tip portion 17 with the suction port 19
Alternatively, it may be provided separately from the air / water feeding nozzle 18. The hood member mounting device 69 may be configured as in the eighth embodiment.

[Additional Notes] According to the above-described embodiment of the present invention as described in detail above, the following configuration can be obtained.

(Additional Item 1) At the tip of the insertion portion of the endoscope,
In an endoscope apparatus in which a hood member having a protruding portion that protrudes in the observation visual field direction of the endoscope is provided, and an observation image of the endoscope has a non-circular shape, the endoscope is provided at a tip edge portion of the protruding portion. An endoscopic device characterized in that a sloped portion having a shape corresponding to an observation visual field region of a mirror is formed.

(Additional Item 2) The endoscope apparatus according to Additional Item 1, wherein the protrusion has at least one notch.

(Additional Item 3) The overlapping amount of the protruding portion with the observation visual field area in at least a part of the range far from the center of the observed image is overlapped with the observation visual field area of the protruding portion in the other range. 3. The endoscope device according to any one of appendices 1 and 2, wherein the endoscope device is formed to be larger than the overlapping amount.

(Additional Item 4) The shape of the observation image is a substantially quadrangle, and the overlapping amount of the projecting portion with the observation visual field region in the range near at least one corner of the observation image is defined as follows. 4. The endoscope apparatus according to appendix 3, wherein the projection portion is formed to have a larger amount of overlap with the observation visual field region in the range near the side portion.

(Additional Item 5) The projecting portion is included in the observation visual field region in the range near at least one corner of the observation image, and the projection portion is defined in the range near the side part of the observation image. The endoscope apparatus according to item 4, wherein the protrusion is formed in a shape that does not fit in the observation visual field region.

(Additional Item 6) An additional item characterized in that the maximum amount of projection of the projecting portion from the most distal lens surface of the observation optical system is set to be equal to or longer than the minimum observation depth of the observation optical system. The endoscope apparatus according to any one of 1 to 5.

(Additional Item 7) The endoscope apparatus according to any one of Additional Items 1 to 6, wherein the hood member is formed so as to be detachable from the distal end portion of the endoscope.

(Additional Item 8) The endoscope according to Additional Item 7, wherein the hood member is detachably formed with respect to the distal end portion of the endoscope, and a positioning means for positioning these is provided. apparatus.

(Additional Item 9) The endoscope according to Additional Item 7, wherein the hood member is detachably formed with respect to the distal end portion of the endoscope, and an index indicating the fixed position of these is provided. apparatus.

(Additional Item 10) In a hood member mounting tool for mounting a detachable hood member on a distal end portion of an insertion portion of an endoscope, a hood member regulating means for regulating a position of the hood member, and the distal end. A hood member mounting means for restricting a position of a portion of the hood member, wherein the mounting position of the hood member with respect to the distal end portion is regulated when the hood member is mounted on the distal end portion. Ingredient

(Additional Item 11) The hood member restricting means has a hood member axial direction restricting part for restricting the axial position of the hood member, and the tip end restricting means is the axial position of the tip end part. 11. The hood member mounting tool as set forth in appendix 10, further comprising a tip end axial direction restricting portion that restricts the above.

(Additional Item 12) The hood member restricting means has a hood member rotation direction restricting part for restricting the position of the hood member in the rotating direction, and the tip end restricting means positions the tip end part in the rotating direction. 12. The hood member mounting tool according to any one of appendices 10 and 11, further comprising a distal end rotation direction restricting portion that restricts the above.

(Additional Item 13) The additional portion 12 is characterized in that the tip end rotation direction restricting portion is an engaging portion that engages with either a concave portion or a convex portion provided on the front end surface of the distal end portion. The hood member mounting device described.

(Additional Item 14) The additional portion is characterized in that the tip rotation direction restricting portion is an engaging portion that engages with a suction port opened at the tip portion or a fluid ejection nozzle protruding at the tip portion. The hood member attachment according to item 13.

(Additional Item 15) An additional item 10 characterized by comprising a hood containing portion for containing the hood member.
15. The hood member attachment according to any one of 14 to 14.

(Additional Item 16) The hood member mounting tool according to any one of additional items 10 to 15 further comprising a hood member fixing portion for removably fixing the hood member.

[0182]

As described above, according to the present invention, it is possible to easily and accurately attach the hood member to the distal end portion of the insertion portion of the endoscope.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an endoscope apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the tip portion of the first embodiment of FIG.

FIG. 3 is a front view of the distal end portion of the endoscope according to the first embodiment of FIG.

FIG. 4 is a side view showing a hood member detachably connected to the distal end portion of the endoscope according to the first embodiment of FIG.

FIG. 5 is a plan view showing an observation image displayed on the monitor according to the first embodiment of FIG.

6 is an explanatory diagram showing an observation visual field area when the observation image of FIG. 5 is displayed.

FIG. 7 is a first explanatory diagram illustrating an operation of the protruding portion according to the first embodiment of FIG.

FIG. 8 is a second explanatory diagram illustrating the operation of the protruding portion according to the first embodiment of FIG.

FIG. 9 is a side view showing a distal end portion of an endoscope according to a second embodiment of the present invention with a part cut away.

FIG. 10 is a side view showing a projecting portion of the distal end portion of the endoscope according to the third embodiment of the present invention.

FIG. 11 is a plan view showing an observation image displayed on the monitor according to the third embodiment of FIG. Is.

FIG. 12 is a plan view showing an observation image displayed on the monitor of the endoscope apparatus according to the fourth embodiment of the present invention.

FIG. 13 is a plan view showing a first example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.

FIG. 14 is a plan view showing a second example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.

FIG. 15 is a plan view showing a third example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.

FIG. 16 is a plan view showing a fourth example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.

FIG. 17 is a cross-sectional view showing a hood member used in the hood member mounting device according to the fifth embodiment of the present invention.

FIG. 18 is a cross-sectional view showing a hood member mounting device according to a fifth embodiment of the present invention.

FIG. 19 is a cross-sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope using the hood member attachment of FIG.

20 is a cross-sectional view showing a state in which the hood member attachment is removed from the state shown in FIG.

FIG. 21 is an explanatory view showing a hood mounting method using the hood member mounting tool according to the sixth embodiment of the present invention.

FIG. 22 is a cross-sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope by using the hood member mounting device according to the seventh embodiment of the present invention.

FIG. 23 is an explanatory view illustrating an operation when the hood member is mistakenly mounted in the hood member mounting tool in the opposite direction in the seventh embodiment of FIG. 22;

FIG. 24 is an explanatory view for explaining the operation when the hood member is attached to the hood member mounting device by mistakenly setting the axial direction of the hood member to the opposite direction in the seventh embodiment of FIG. 22.

FIG. 25 is a cross-sectional view showing a hood member mounting device according to an eighth embodiment of the present invention.

FIG. 26 is a perspective view showing a state in which the hood member attachment of FIG. 25 is opened.

FIG. 27 is an explanatory view showing a state in which the hood member is attached to the distal end portion of the endoscope by using the hood member attachment according to the ninth embodiment of the present invention.

[Explanation of symbols]

1 ... Endoscopic device 2 ... Endoscope 3 ... Light source device 4 ... Signal cable 5… Video processor 6 ... Monitor 7 ... Insert 17 ... Tip 34 ... Observation optical system 37 ... Hood member 38 ... Projection 39 ... Endoscope fixing part 43 ... Tip edge 47 ... Observation area 48 ... Slope 49 ... Slope 50 ... Hood member 53 ... Hood fitting 56 ... Hood member abutting portion 57 ... Tip contact part

Claims (3)

[Claims] 1. A hood member mounting tool for mounting a detachable hood member on a distal end portion of an insertion portion of an endoscope, wherein a hood member regulating means for regulating a position of the hood member, and a distal end portion of the insertion portion. A front end regulating means for regulating the position; and, when the hood member is mounted on the front end of the insertion portion, the mounting position of the hood member relative to the front end of the insertion portion is regulated. Parts mounting equipment. 2. The hood member restriction means has a hood member axial direction restriction part for restricting the axial position of the hood member, and the distal end part restriction means means the axial position of the insertion part distal end part. The hood member mounting tool according to claim 1, further comprising a tip end axial direction restricting portion that restricts the hood member. 3. The hood member restriction means has a hood member rotation direction restriction part for restricting the position of the hood member in the rotation direction, and the tip end restriction means is a position of the insertion part tip end part in the rotation direction. The hood member mounting tool according to claim 1 or 2, further comprising a distal end rotation direction restricting portion that restricts the rotation of the hood member.