JPH10192239A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an easy irrigation by bringing a tip cover member with a nozzle into contact tightly with a tip construction part without a gap and thereby preventing air and water supply from taking place in a direction other than desired. SOLUTION: The tip part 6 of this endoscope 1 is equipped with a tip construction part 10 and a tip cover member 15 which is freely detachable from the tip construction part 10. In addition, a lighting lens 12 and an observation window 14 are mounted on the tip face 10a of the tip construction part 10 and also a channel 21 for receiving a medical instrument to be introduced is opened in the tip face 10a. The tip cover member 15 has an overhanging part 17 covering the tip construction part 10 from its tip side. Further, the overhanging part 17 has an elastic material 20 formed monolithically between the part 17 and the tip face 10a. The elastic material 20 communicates with an air and a water supply aperture 16 together with the overhanging part 17 to form a flow path 19 which is opened in the observation window 14. The flow path 19, the elastic form 20 and the overhanging part 17 form a nozzle 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distal end cover member provided detachably with respect to the distal end of an endoscope inserted into a body cavity, and having a nozzle formed therein for cleaning an observation window of the endoscope. And an endoscope having the same.

[0002]

2. Description of the Related Art When an endoscope is inserted into a body cavity to observe the inside of the body cavity, a body fluid in the body cavity or a contrast agent used in an endoscope treatment adheres to the surface of an observation window of the endoscope. There is. Therefore, a nozzle is provided at the end of the endoscope for removing body fluid and the like attached to the surface of the observation window by ejecting water or air.

However, when an endoscope is inserted into a body cavity, a body fluid or the like may enter the nozzle from its opening due to a pressure difference between the body cavity and the nozzle. In this case, if the inside of the nozzle is not thoroughly washed to remove body fluid and the like, the body fluid and the like may adhere to the nozzle and clog the inside of the nozzle, making it impossible to supply air or water.

Therefore, as a means for efficiently cleaning the inside of the nozzle, as shown in Japanese Utility Model Publication No. 64-6804 and Japanese Utility Model Application No. 58-41159, a tip cover detachable from the tip of an endoscope is disclosed. A nozzle is provided integrally with the member,
It is known that the nozzle and the peripheral portion of the nozzle can be easily cleaned by removing the distal end cover member from the distal end of the endoscope at the time of cleaning.

In Japanese Utility Model Application No. 58-41159, an air supply / water supply opening is provided at the distal end face of the insertion portion, and the distal end cover member covers the opening of the air supply / water supply port so as to provide a gap between the air supply and water supply opening. And a nozzle communicating with the air / water supply port. By removing this tip cover member,
A part of the tip surface forming the nozzle is exposed on the surface,
It is easy to wash.

However, in the endoscope described in Japanese Utility Model Application No. 58-41159, the nozzle and the peripheral portion of the nozzle are easily cleaned, but the nozzle is composed of the distal end cover member and the distal end surface of the insertion portion. In addition, a gap other than the nozzle is easily generated between the distal end cover member and the distal end surface of the insertion portion.

[0007] For this reason, it is conceivable that air and water cannot be efficiently supplied to the observation window, or that water leaks from a portion other than the nozzle and adheres to the observation window, thereby causing a problem in inspection.

In order to solve the above-mentioned problem, Japanese Patent Application Laid-Open No. 7-171091 discloses a detachable distal cover member having a nozzle, in which a fluid pipe opened at the distal end surface of the distal end component of the endoscope is provided. A description is given in which a water-tight elastic member is provided so as to surround an outlet of a road. In Japanese Patent Application Laid-Open No. 8-84701, a nozzle is formed by engaging with a convex portion provided on a tip end body. It is described that a packing is provided on a front end wall of a tip cap to reduce water leakage.

[0009]

However, in the endoscope described in Japanese Patent Application Laid-Open No. 7-171091, the elastic member is provided only around the outlet of the fluid conduit.
It is not provided around the nozzle opening (between the tip cover member and the tip surface of the tip component). Therefore, even if water leakage from around the outlet of the fluid conduit is prevented, water leakage may occur around the nozzle opening (between the distal end cover member and the distal end surface of the insertion portion).

When water leaks from the periphery of the nozzle opening, as described above, the air is supplied in a direction other than the desired direction, thereby reducing the efficiency of the air supply and water supply or remaining in a gap around the nozzle. The spilled water flows out at the time of air supply and adheres to the observation window, obstructing the visual field, and causing a defect in the inspection.

On the other hand, in the endoscope described in JP-A-8-84701, a projection protruding forward is provided on the distal end surface of the distal end portion of the endoscope so as to surround the outlet of the fluid conduit from three directions. ,
A packing is provided on the front end wall of the tip cap that engages with the projection. Although this packing can reduce water leakage from around the nozzle, a disadvantage arises in that cleaning is troublesome due to the provision of the convex portion on the front end surface.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a distal end cover member having a nozzle which is detachably attached to the distal end of the endoscope and has no gap with the distal end constituting portion of the endoscope. It is an object of the present invention to provide an endoscope that can be closely attached to prevent water leakage from a gap or air / water supply in a direction other than a desired direction, and can easily perform washing and improve work efficiency.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a detachable distal end portion provided at the distal end of an insertion portion inserted into a body cavity, and a detachable distal end portion. In an endoscope having a distal end cover member formed with a nozzle communicating with a fluid conduit opened to the distal end surface, a fixing means for fixing the distal end component and the distal end cover member in a pressure-contact state, and the fluid pipe A close-contact means for maintaining a state in which the opening of the road and the nozzle are in close communication with each other is provided.

As described above, by providing the close contact means for keeping the opening of the fluid conduit and the nozzle in close communication with each other, the distal end component around the nozzle and the distal end cover member come into close contact with each other, and Therefore, it is possible to prevent water leakage from the gap and air supply / water supply in a direction other than a desired direction.

Further, by providing a fixing means for fixing the distal end component and the distal end cover member in pressure contact with each other, the action of the close contact means is further enhanced, and the adhesion between the distal end component and the distal end cover member is enhanced. .

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment, FIG. 1 shows an overall view of an endoscope 1 using a distal end structure of the first embodiment of the present invention, and FIG. 1 shows an enlarged end portion 6 of the endoscope 1.

As shown in FIG. 1, the endoscope 1 includes an insertion section 3, an operation section 2, and a universal cord section 4 which are inserted into the body cavity from the distal end side. The insertion portion 3 has such a thickness that it can be inserted into a body cavity, and has a configuration in which a distal end portion 6, a curved portion 7, and a flexible tube portion 8 are sequentially connected in series from the distal end. A connector section 5 is provided at the end of the universal cord section 4 so as to be connected to a light source device (not shown).

FIG. 2 shows the structure of the distal end 6 which is the distal end of the insertion section 3. As shown in FIG. 2, a light guide (not shown) and an image pickup device 11 are arranged in a distal end component 10 constituting the distal end portion 6, and a light source device is provided on the distal end side of the light guide via the light guide. An illumination lens 12 that expands and emits illumination light supplied from the camera, and an objective lens system 13 that forms a subject image on the imaging element 12 is attached to a distal end side of the imaging element 11. Also,
The most advanced lens of the objective lens system 13 is also the observation window 14.

FIG. 2A is a view of the distal end portion 6 as viewed from the distal end side, FIG. 2B is a sectional view taken along the line ABCD in FIG. 2A, and FIG. Is E- in FIG. 2 (B).
It is sectional drawing which follows the E line.

Further, the distal end portion 6 is provided with a distal end cover member 15 which is fitted to the distal end forming portion 10 and is detachably formed in a tubular shape. The distal end cover member 15 directs a flow path 19, which will be described later, which communicates with an air supply / water supply port 16 as a fluid conduit opened to the distal end component 10 to the observation window 14, and a part of the distal end component 10 is An eave-like eave portion 17 is provided to cover from the side.

The air / water supply port 16 is an open end of an air / water supply line 18 through which a liquid such as water or a gas such as air supplied from a pump or a water supply tank (not shown) is inserted. Erupt.

As shown in FIGS. 2B to 2C,
An elastic body 20 as a close contact means made of a deformable elastic member or the like is provided integrally with the eaves portion 17 at a position where the eaves portion 17 and the distal end surface 10a of the distal end portion 10 come into contact with each other. The elastic body 20, together with the eaves 17, forms a flow path 19 that communicates with the air / water supply port 16 at one end and opens to the observation window 14 at the other end.

Further, the elastic body 20 keeps the space between the distal end component 10 and the distal end cover member 15 tightly, and
If there is no gap in and around 4
Eaves portion 17 where the tip cover member 15 and the tip cover member 15 abut against each other
Of the flow path 19 such as the edge 17b of the
It may be provided only in at least a part of the portion facing 4.

The eaves 17, the elastic body 20, and the flow path 19 provided on the tip cover member 15 form a nozzle 24. The nozzle 24 injects a liquid such as water or a gas such as air supplied from the air / water supply pipe line 18 and passed through the air / water supply port 16 from the flow path 19 to form the observation window 14.
It has a function of washing.

A treatment instrument insertion channel 21 is opened in the distal end face 10a of the distal end component 10, and a bending portion 7 is connected to the rear end side of the distal end component 10. The elastic body 20 is desirably made of a soft resin such as fluoro rubber, polyurethane, silicon rubber and the like. The tip cover member 15 is preferably made of a resin harder than the elastic body 20 and having elasticity, for example, polysulfone, polycarbonate, PMMA, polyphenylene sulfide, or the like.

As shown in FIG. 2B, the distal end component 10 is provided with a concave portion 23 which is concave in the inner diameter direction of the distal end component 10 and constitutes a fixing means. Is provided with a convex portion 22 which is convex in the inner diameter direction of the distal end constituting portion 10 and constitutes a fixing means.

The engagement between the concave portion 23 and the convex portion 22 causes the distal end cover member 15 to be connected to the distal end portion 10.
To be fixed. The convex part 22 and the concave part 2
3, a part of the distal end face 10a of the distal end component 10 is an elastic body 2;
0, and are provided at positions where the elastic body 20 is pressed.

Further, the fixing means is provided in the distal end portion 10.
The convex portion 22 and the concave portion 23 do not need to be used as long as the convex portion 22 and the concave portion 23 can be fixed by sufficiently pressing and contacting the front end cover member 15.
At this time, the distal cover member 15 is attached to the distal end component 10 by using the elastic force of the distal end cover member 15 generated by forming the inner diameter of the cylindrical portion 15a of the distal end cover member 15 smaller than the outer diameter of the distal end component 10. Fix it.

When the fixing means is constituted by the elastic force of the distal end cover member 15, the inner diameter of the cylindrical portion 15a of the distal end cover member 15 is limited to the outer diameter of the distal end constituting portion 10 within a range in which the distal end cover member 15 is elastically deformed. It is formed smaller. The inner diameter of the cylindrical portion 15a may be smaller than the outer diameter of the distal end portion 10 locally or over the entire length of the cylindrical portion 15a.

As shown in FIG. 3, the thickness of the elastic body 20 in the undeformed steady state is represented by t, and the elastic body 2 in the steady state is represented by t.
Assuming that the distance from the base end surface of the protrusion 0 to the engagement surface 22a of the protrusion 22 is x, and the distance from the front end surface 10a of the tip component 10 to the engagement surface 23a of the recess 23 is y, the protrusion 22 The recesses 23 are provided at positions where x <y, and the elastic body 20 is configured to elastically deform by (y−x) from t.

When the distal end cover member 15 is extrapolated from the state shown in FIG. 3 to the distal end portion 10 with the above-described configuration, the distal end cover member 15 has elasticity.
Abuts on the side surface 10 b of the distal end component 10 and elastically deforms outwardly, while being fitted to the distal end component 10.

Eventually, the convex portions 22 are engaged with the concave portions 23, and the distal end cover member 15 is brought into pressure contact with the distal end constituting portion 10 by an elastic restoring force as shown in FIG. As described above, the fixing means including the convex portion 22 and the concave portion 23 causes the distal end component 10 and the distal end cover member 15 to move in the radial direction of the distal end portion 6 (insertion portion 3) by the elastic restoring force of the distal end cover member 15. Press and fix.

At this time, the elastic body 20 is kept compressed by (y-x) in the longitudinal direction of the distal end portion 6. Since the compressed elastic body 20 generates an elastic restoring force, the elastic body 20 presses the distal end component 10 and the distal end cover member 15, thereby keeping the distal end component 10 and the distal end cover member 15 tight. It will be. As described above, the elastic body 20 contracts in the longitudinal direction of the distal end portion 6 (insertion portion 3) by the engagement between the convex portion 22 and the concave portion 23, and presses the distal end component portion 10 and the distal end cover member 15 into pressure. .

Therefore, no gap is formed between the elastic body 20 and the distal end component 10, and the distal end face 10 a of the distal end component 10
The fluid supplied from the air supply / water supply port 16 that is opened to the outside is leaked from the space between the elastic body 20 and the distal end component 10, passes through the flow path 19, and is jetted toward the observation window 14.

Since the end cover member 15 is made of an elastic resin, the end cover member 15 is
When the distal end member 1 is pulled toward the distal end in the axial direction, the convex portion 22 rides over the concave portion 23 and abuts against the side surface 10a of the distal end component portion 10, so that the distal end cover member 15 elastically deforms outward while the distal end component portion 1 is elastically deformed.
It will be removed from 0.

According to the present embodiment, the nozzle 24 is formed by a simple structure such as the eave portion 17 and the elastic body 20 without providing any projections or other irregularities on the tip end surface 10a of the tip end portion 10. In addition to being able to wash relatively easily, the elastic member 20 keeps the space between the distal end component 10 and the distal end cover member 15 tight, so that no gap is formed around the nozzle 24 and the periphery thereof, and the elastic member 20 extends along the flow path 19. Only the fluid flows and is ejected toward the observation window 14.

Therefore, the power and efficiency of the ejection are reduced due to the leakage of the fluid ejected from the nozzle 24 to other parts, and water or the like remaining in the gap generated between the tip component 10 and the tip cover member 15 is supplied. Occasionally, it does not obstruct the field of view by adhering to the observation window 14.

In this embodiment, FIG.
As shown in FIG. 4A showing a cross-sectional view taken along line FF of FIG.
4 may be formed by the elastic body 20 and the wall surface of the eave portion 17. As shown in FIG. 4B, a groove-shaped groove portion 25 having an opening in the observation window 14 direction is formed on the eave portion 17, The flow path 19 may be formed by providing the elastic body 20 on at least a part of the portion of the eave portion 17 facing the distal end constituting portion 10 and the groove portion 25.

The tip cover member 15 may be formed integrally with the elastic body 20 and may be made of a soft resin such as fluoro rubber, polyurethane, silicon rubber and the like. FIGS. 5 and 6 show a second embodiment, in which the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, as shown in FIG. 5 and FIG.
Around the eaves portion 17 and the tip surface 1
A bottom portion 26 which is one step lower than Oa is formed, and the distal end cover member 15 is provided with a fitting portion 29 fitted to the bottom portion 26.

The fitting portion 29 has a hole 29a having a cross section substantially the same as that of the air / water supply port 16.
The side 7 communicates with the air / water supply port 16. FIG. 5 (B)-
As shown in (C), the distal end cover member 15 is provided between the fitting portion 29 and the wall surface 26a of the bottom portion 26 on the observation window 14 side as an elastic body 28 as a close contact means made of a deformable elastic member or the like. Are provided integrally. The elastic body 28 is provided with the eave portion 17 of the tip cover member 15 and the hole 29 of the fitting portion 29.
A nozzle 27 is formed which communicates with the air supply / water supply port 16 and is directed to the observation window 14 together with a.

The elastic body 28 is desirably made of a soft resin such as fluorine rubber, polyurethane, or silicone rubber. Further, the tip cover member 15 is preferably made of a resin harder than the elastic body 28, for example, polysulfone, polycarbonate, PMMA, or polyphenylene sulfide.

As shown in FIG. 6 (A), the elastic body 28 has a thickness s in an undeformed steady state, a width u in the direction of the distal end surface 10a of the bottom 26, and a fitting in the bottom 26. Assuming that the width of the fitting portion 29 in the direction of the distal end surface 10a is w, s +
The thickness is formed such that w> u, and the fitting portion 29 of the distal end cover member 15 is
Is configured to be elastically deformed by (u−w) from s when fitted to s.

When the distal end cover member 15 is externally inserted into the distal end portion 10 from the state shown in FIG. 6A, the distal end cover member 15 has elasticity. It fits into the part 10.

Eventually, the convex portion 22 engages with the concave portion 23, and as shown in FIG. 5, the distal end cover member 15 presses the distal end constituting portion 10 by elastic restoring force to be fixed to each other. As described above, the fixing means including the convex portion 22 and the concave portion 23 couples the distal end component 10 and the distal cover member 15 to the distal end 6 by the elastic restoring force of the distal end cover member 15.
(Insertion part 3) is pressed in the radial direction and fixed.

Also, at this time, the elastic body 28 is
It is kept in a state of being compressed by (u−w) in the radial direction of 0.
Since the compressed elastic body 28 generates an elastic restoring force, the elastic body 28 presses the side surface 26 a of the bottom portion 26 and the fitting portion 29, so that the space between the front end component 10 and the front end cover member 15 is dense. Will be kept. Thus, the elastic body 28
The engagement between the convex portion 22 and the concave portion 23 causes the distal end portion 6 (insertion portion 3) to contract in the radial direction, thereby bringing the distal end component portion 10 and the distal end cover member 15 into pressure contact with each other.

For this reason, the elastic body 28 and the tip component 10,
That is, there is no gap between the nozzle 27 and the tip component 10, and the fluid supplied from the air / water supply port 16 opened to the bottom 26 does not leak from between the nozzle 27 and the tip component 10. The liquid is injected toward the observation window 14 through the nozzle 27.

Further, since the distal end cover member 15 is made of an elastic resin, when the distal end cover member 15 is pulled toward the distal end side in the axial direction of the distal end portion 6, the convex portion 22 is deformed so as to ride over the concave portion 23 while the distal end cover member 15 is deformed. The cover member 15 is withdrawn from the distal end component 10.

According to the present embodiment, since the elastic body 28 keeps the space between the distal end component 10 and the distal end cover member 15 dense,
The fluid flows only inside the nozzle 27 without being clogged in the nozzle 27 and its periphery, and is jetted toward the observation window 14.

Accordingly, the fluid ejected from the nozzle 27 leaks to the other and the ejection force and the efficiency are reduced, and the fluid remains in the gap formed between the eaves portion 17 (tip cover member 15) and the tip component portion 10. Water will adhere to the observation window 14 when air is supplied, and will not obstruct the field of view.

Further, since no irregularities are provided on the distal end surface 10a of the distal end component 10, the nozzle 27 and its periphery can be washed relatively easily. Further, in the present embodiment, as shown in FIG.
7a may be provided over the entire circumference of the end cover member 15a.
Is integral with the elastic body 28 and is made of fluorine rubber, polyurethane,
It may be made of a soft resin such as silicone rubber.

FIG. 7 shows a third embodiment, in which the same components as those in the first and second embodiments are assigned the same reference numerals and explanations thereof are omitted. In the present embodiment, a screw portion 31 is provided on the outer periphery of the distal end portion 10. The screw portion 31 is separate from the distal end portion 10 and the distal end cover member 15, is screwed to the screw portion 31, and is opened on the distal end side. A screw member 30 having an engaging portion 32 is provided.

The engaging portion 32 is formed so as to be open at the front end and to be concave at the rear end, and to have a notch that expands toward the rear end. The distal end cover member 15 is integrally provided with a convex portion 33 that is formed to diverge toward the rear end side so as to engage with the engaging portion 32 provided on the distal end side of the screw member 30. The engaging portion 3
The projections 2 and the projections 33 are in contact with each other and have slopes formed toward the outer peripheral direction of the distal end portion 6 toward the rear end side.

The screw member 30 is connected to the front cover member 15.
The engaging portion 32 and the protruding portion 33 constitute a fixing means for fixing the end portion 10 and the tip constituting portion 10. With the above-described configuration, the screwing member 30 is engaged with the distal end cover member 15 at a part of the engaging portion 32 and the like, and is partially engaged with the threaded portion 31 of the distal end component 15 to form the distal end. The cover member 15 and the distal end component 10 are fixed in a state of being pressed against each other.

As shown in FIG. 7B, an eave portion 17 of the distal end cover member 15 communicates with an air supply / water supply port 16 opened in the distal end component 10 and a groove 25 facing the observation window 14. Is provided.

The tip cover member 15 is made of fluoro rubber,
Even if it is composed of a soft resin such as polyurethane or silicone rubber, for example, polysulfone, polycarbonate, P
It may be made of a hard resin such as MMA and polyphenylene sulfide.

With the above-described configuration, the front cover member 15
When the distal end cover member 15 is externally inserted and fitted into the distal end component 10 together with the screwing member 30 in a state in which the convex portion 33 and the engaging portion 32 of the screwing member 30 are engaged, the eaves portion is formed. The base end side 17a of 17 contacts a part of the distal end surface 10a of the distal end component 10.

When the screw member 30 is screwed into the screw portion 31 as it is, the screw member 30 moves to the rear end side of the distal end portion 6. After that, the screwing member 30 includes the engaging portion 32 and the convex portion 33.
If the slopes are closely contacted with each other, it cannot move to the rear end side.

At this time, the engaging portion 32 and the convex portion 33 are in close contact with each other, and the base end side 17a of the eave portion 17 and the distal end forming portion 10
Is kept in contact with the front end surface 10a without any gap, so that the space between the front end component 10 and the front end cover member 15 is kept dense.

That is, the screwing member 30 is arranged such that the distal end component 10 and the distal end cover member 1 extend in the longitudinal direction of the distal end portion 6 (insertion portion 3).
5 is fixed by pressure contact, and the close contact means including the engaging portion 32 and the convex portion 33 is fixed to the distal end cover member 15 and the distal end constituting portion 10 by the fixing means. The tip cover member 15 and the tip component 10 are closely contacted in the direction.

A nozzle 27 that opens toward the observation window 14 is formed by the groove 25 of the eave portion 17 and the distal end surface 10 a of the distal end component 10. Further, when removing the distal end cover member 15 from the distal end forming portion 10, the screw member 30 is rotated to the opposite side to that at the time of attachment. Then, the contact between the engagement portion 32 and the projection 33 is released, and the eaves 17
And the distal end surface 10a of the distal end component 10 does not come into contact. If the screwing member 30 continues to rotate as it is, both the screwing member 30 and the distal end cover member 15 will be removed from the distal end component 10.

In this embodiment, instead of the engaging portion 32 and the convex portion 33, the elastic body 20 is provided between the eave portion 17 and the tip end surface 10a as shown in the first embodiment.
Is provided, and the screw member 3 is elastically deformed.
By screwing 0, the space between the distal end cover member 15 and the distal end component 10 may be kept dense.

According to the present embodiment, the screw member 30 and the like make the eaves portion 17 and the distal end component portion 10 in close contact with each other, so that the nozzle 27 and the air / water supply port 16 are in close communication with each other. The fluid is inserted only into the nozzle 27 and is ejected toward the observation window 14 without a gap being formed in and around the nozzle 27.

Accordingly, a decrease in the momentum and efficiency of the fluid due to the leakage of the fluid ejected from the nozzle 27 to other parts,
Water and the like remaining in the gap generated between the eaves portion 17 and the tip constituting portion 10 adhere to the surface of the observation window 14 at the time of air supply, so that the field of view is not obstructed.

Since no irregularities are formed on the distal end face 10a of the distal end component 10, the nozzle 27 and its periphery can be washed relatively easily. According to the above-described embodiment, the following configuration is obtained. (Supplementary Note 1) A tip formed with a nozzle that is detachable from a tip component provided at the tip of an insertion portion inserted into a body cavity and is formed with a nozzle that communicates with a fluid conduit opened at the tip surface of the tip component. In an endoscope having a cover member, a fixing means for fixing the distal end component portion and the distal end cover member in a pressure-contact state, and a close contact for keeping an opening of the fluid conduit and the nozzle in a tight communication state. And an endoscope. (Supplementary Note 2) The fixing unit presses and fixes the distal end component and the distal end cover member in a longitudinal direction or a radial direction of the insertion portion, and the close contact unit is configured to contact the distal end component by the fixing unit. 2. The endoscope according to claim 1, wherein the endoscope comprises an elastic member which contracts in a longitudinal direction or a radial direction of the insertion portion while being fixed to the distal end cover member and presses the distal end component portion and the distal end cover member. (Supplementary Note 3) The fixing means is provided over the tip cover member and the tip component, and the elastic member is provided on the tip cover member, and the tip component is fixed to the tip cover member by the fixing means. 3. The endoscope according to claim 2, wherein the endoscope is deformable and generates an elastic restoring force. (Supplementary Note 4) The endoscope according to Supplementary Note 3, wherein the elastic member is provided at least in part between the distal end cover member and the distal end component. (Supplementary Note 5) The tip cover member is provided with an eave portion that covers a part of the tip component from the tip side, and the eave portion has an opening in the direction of the observation window and is open to the tip component. A groove which communicates with a road is formed, and the elastic member is provided on at least a part of a portion where the eaves portion and the tip component come into contact with each other.
The endoscope as described. (Supplementary Note 6) The endoscope according to Supplementary Note 5, wherein the elastic member is provided at a portion where the eaves portion and the distal end portion abut, and at least a part of an edge of the eaves portion. (Supplementary Note 7) The endoscope according to Supplementary Note 5, wherein the elastic member is provided at a portion where the eaves portion and the distal end configuration portion are in contact with each other and at least a part of the eaves portion facing the groove portion. . (Supplementary Note 8) The endoscope according to Supplementary Note 5, wherein the elastic member is provided on at least a part of a portion where the eaves portion and the distal end portion contact each other and a portion facing the opening of the eaves portion. mirror. (Supplementary Note 9) The distal end cover member is formed in a tubular shape to be fitted to a distal end portion, and the elastic member is provided on at least a part of an inner surface of the tubular distal end cover member. The endoscope according to attachment 4, wherein the endoscope is characterized in that: (Supplementary Note 10) The distal end cover member formed in the cylindrical shape may include:
A flow path that communicates with the fluid conduit on one end side and forms a nozzle that opens to the observation window on the other end side is provided, and the elastic member includes:
The endoscope according to claim 9, wherein the endoscope is provided at a position facing the nozzle of the distal end cover member and in contact with the distal end surface of the distal end component. (Supplementary note 11) The endoscope according to any one of Supplementary notes 3 to 10, wherein the fixing means includes a concave portion and a convex portion provided on the distal end cover member and the distal end component portion and engaged with each other. mirror. (Supplementary Note 12) The fixing means forms the inner diameter of the cylindrical portion of the distal end cover member smaller than the outer diameter of the distal end component,
The endoscope according to any one of supplementary notes 3 to 10, wherein the distal end cover member is fixed to the distal end constituting portion by elastic deformation of the cylindrical portion. (Supplementary note 13) The endoscope according to Supplementary note 12, wherein the inner diameter of the distal end cover member is formed smaller than the outer diameter of the distal end component within a range of elastic deformation of the distal end cover member. (Supplementary note 14) The endoscope according to supplementary note 12, wherein at least a part of the inner diameter of the cylindrical portion of the distal end cover member is formed smaller than the outer diameter of the distal end component. (Supplementary Note 15) The fixing means is separate from the tip cover member and the tip component, and is partially engaged with the tip cover member and partially screwed into the tip component to thereby form the tip cover. 2. The endoscope according to claim 1, wherein the endoscope is a screwing member that fixes the member and the distal end component in a pressure-contact state and keeps the fluid conduit and the nozzle in a tight communication state. (Supplementary Note 16) The fixing means partially engages with the distal end cover member and partially engages with the distal end configuration portion to fix the distal end cover member and the distal end configuration portion in pressure contact with each other, The screw member according to claim 2, wherein the screw member is a screw member that keeps the fluid conduit and the nozzle in close communication with each other by pressing the elastic member by screwing. Endoscope. (Supplementary Note 17) The tip cover member is made of a hard resin,
The endoscope according to any one of supplementary notes 1 to 16, wherein the elastic member is made of a soft resin. (Supplementary note 18) The endoscope according to supplementary note 17, wherein the hard resin is polysulfone. (Supplementary Note 19) The hard resin is characterized by being polycarbonate. An endoscope according to attachment 17. (Supplementary note 20) The endoscope according to supplementary note 17, wherein the hard resin is polyphenylene sulfide. (Supplementary note 21) The endoscope according to supplementary note 17, wherein the soft resin is silicone rubber. (Supplementary Note 22) The endoscope according to supplementary note 17, wherein the soft resin is urethane. (Supplementary note 23) The endoscope according to supplementary note 17, wherein the soft resin is a fluororesin.

According to Supplementary Notes 1 to 23, the distal end component around the nozzle and the distal end cover member are brought into close contact with each other by the close contact means for keeping the opening of the fluid conduit and the nozzle in close communication with each other. Therefore, it is possible to prevent water leakage from the gap and air / water supply in a direction other than the desired direction without generating an extra gap.

Further, the function of the close contact means is further enhanced by the fixing means for pressing and fixing the front end component and the front cover member. According to Supplementary Notes 2 to 3, the elastic member as the close contact means keeps the distal end component and the distal end cover member tight by fixing the distal end cover member and the distal end component by the fixing means. Water leakage from the gap and air / water supply in a direction other than the desired direction can be prevented without generating an extra gap therebetween.

According to appendices 4 to 10, since the elastic member as the close contact means is provided between the distal end cover member and the distal end component, the elastic member is fixed by the fixing means to fix the distal end component and the distal end cover member. Therefore, the distal end component and the distal end cover member are brought into close contact with each other.

As a secondary effect, since the elastic member is provided between the distal end portion and the distal end cover member, there is no need to provide a step such as a convex portion on the distal end surface of the distal end portion. Therefore, the nozzle and the periphery of the nozzle are easily washed.

According to Supplementary Note 10, since the elastic member is provided at a position facing the nozzle and in contact with the distal end face of the distal end portion, no extra gap is formed except for the nozzle.
This prevents water leakage from the gap and air / water supply in a direction other than the desired direction.

According to appendix 11, since the fixing means is composed of the concave portion and the convex portion, the distal end cover member presses and fixes the distal end component in the radial direction. Supplementary notes 12 to 14
According to this, since the inner diameter of the cylindrical portion of the distal end cover member is formed smaller than the outer diameter of the distal end component portion, the distal end cover member presses the distal end component portion in the radial direction and is fixed by the elastic restoring force of the cylindrical portion. Will be done.

According to Supplementary Notes 15 and 16, the screw member as the fixing means presses and fixes the distal end cover member and the distal end component in the longitudinal direction, and the fluid pipe and the nozzle are in tight communication. , So that the leading end component around the nozzle and the leading end cover member are in close contact with each other, and no extra gap is formed between them, thereby preventing water leakage from the gap and air / water supply in a direction other than the desired direction. .

According to Supplementary Note 16, the screwing member presses and fixes the distal end cover member and the distal end component in the longitudinal direction, and fixes the elastic member by fixing the distal end cover member and the distal end component by the screwing member. Since it is deformed and keeps the fluid line and the nozzle in close communication with each other, the tip component around the nozzle and the tip cover member are brought into close contact with each other, and no extra gap is created between them. Water leakage and air / water supply in a direction other than the desired direction can be prevented.

Further, in the examination using an endoscope, as shown in Japanese Utility Model Application No. 56-150306, to secure the visual field of the observation system and to hold the O-ring used for ligating polyps and the like. In some cases, a tip hood is attached to the tip of the endoscope.

However, in an endoscope having a tip cover member detachably attached to the tip of the endoscope and integrally provided with a nozzle, as shown in Japanese Utility Model Publication No. 64-6804, the tip hood is not provided. When attached to the tip cover member,
When an external force acts on the distal end hood, the external force may exceed the strength of attachment between the distal end cover member and the distal end portion of the endoscope, and the distal end cover member may fall off together with the distal end hood.

In order to avoid the falling off of the distal end hood and the distal end cover member, the mounting strength between the distal end cover member and the endoscope distal end portion is increased. The force increases, and the work efficiency of the operator decreases.

Further, it is conceivable that the end cover is constituted by an integral member which also serves as a tip hood. However, when the tip hood is unnecessary, the field of view of the observation system is restricted, and the insertion portion of the endoscope is not used. It is not desirable because the diameter becomes large.

FIGS. 8 to 10 show the structure of the distal end of the endoscope which solves the above-mentioned problem, and prevents the distal end hood and the distal end cover member from falling off. 8 to 10 show the first disclosure example, and the same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.

As shown in FIGS. 8 to 10, in the example of the present disclosure, the distal end portion 6 is provided with a detachable distal end hood 34, and the outer diameter of the distal end cover member 15 is outside the distal end portion 10. The diameter is formed substantially the same as or smaller than the diameter.

As shown in FIGS. 8A and 8B, the distal end hood 34 is attached to a hard portion located on the distal end side of the endoscope 1, such as the outer peripheral surface 10b (side surface) of the distal end component 10. In addition, it is provided so as to protrude toward the distal end side, and is formed in an uneven thickness cylindrical shape. The inner diameter of the tip hood 34 is the same as or larger than the outer diameter of the tip component 10 so that the tip hood 34 is fitted only on the outer peripheral surface 10b (side surface) of the tip component 10 and has sufficient attachment strength. It is formed small.

The tip hood 34 may be made of an elastic soft resin such as fluorine rubber, polyurethane, silicone rubber or the like, or may be made of an elastic hard resin such as polysulfone, polycarbonate, PMMA, or polyphenylene sulfide. Is also good.

As shown in FIG. 8A, the tip hood 34 is formed by using the elasticity of the tip hood 34 itself.
8B, the inner surface of the distal end hood 34 and the outer peripheral surface 10b of the distal end component 10 may be provided with irregularities that engage with each other, as shown in FIG. good.

In the illustrated example, a convex portion 34a is formed on the inner surface of the distal end hood 34 in the inner peripheral direction of the distal end portion 6, and a concave portion is formed on the side surface 10b of the distal end portion 10 in the inner peripheral direction of the distal end portion 6. A recess 10c is provided.

When the distal hood 34 is extrapolated from the distal end side of the distal end portion 6 by the above-described configuration, the distal hood 34 is configured by the elastic force of the distal hood 34 itself or the fitting of the convex portion 34a and the concave portion 10c. Outer peripheral surface 10b of part 10
Crimp and fix. At this time, the tip hood 34 and the tip cover member 15 are not fixed to each other. In this state, the endoscope 1 is inserted into a body cavity to perform observation and treatment.

When the tip hood 34 is to be removed, the tip hood 34 is pulled out from the tip constituting portion 10 so that the elastic deformation of the hood 34 itself or the protrusion 34a
By exiting from Oc, it is withdrawn from the distal end component 10.

According to the embodiment of the present disclosure, the tip hood 34 is attached only to the tip component 10 and the tip cover member 15
Are not fixed to each other, even if an external force acts on the distal hood 34 during a procedure such as observation in a body cavity, the distal hood 34 is configured to have a sufficient attachment strength to the distal component 10. So they won't fall off.

The tip cover member 15 is attached to the tip component 1.
Since the outer diameter of the distal end hood 34 used in the conventional endoscope to which the distal end cover member 15 is not attachable / detachable is formed because the outer diameter of the distal end component 10 is not larger than the outer diameter of the distal end portion 10 and is formed to be substantially the same diameter or smaller. It can be used also in the present disclosure example.

As shown in FIG. 8B, when the inner surface of the tip hood 34 and the side surface 10b of the tip component 10 are provided with projections and depressions that engage with each other, the tip hood 34 is Even if an external force acts on the tip hood 34 during a procedure such as observation in a body cavity, the tip hood 34 has a sufficient attachment strength to the tip constituting portion 10 and is likely to fall off. Can be more reliably prevented.

As a secondary effect, the tip hood 34
Is not fixed to the detachable tip cover member 10, but is fixed to the tip component 10, so that it is not necessary to increase the mounting strength between the tip cover member 15 and the tip component 10, and There is no reduction in detachability.

The tip hood 34 is provided at the tip portion 1
9 (A) and 9 (B) instead of the outer peripheral surface 10b of FIG. 9 and the outer peripheral surface of the bonding portion 41 in which the bending portion 7 is bonded and fixed to the outer peripheral surface 10b of the distal end portion 10 as shown in FIGS. May be fitted and attached. In this case, the outer diameters of the distal end cover member 15 and the distal end component 10 are changed to the distal end hood 3.
It is desirable that the distal end hood 34 and the distal end cover member 15 are not fixed to each other by being formed to be smaller than the outer diameter on the outer peripheral surfaces of the curved portion 7 and the bonding portion 41 to which the attachment 4 is attached.

Further, as shown in FIG.
4 may be formed of a flexible tube body 42 made of silicon rubber, polyurethane, or the like, and may be fixed to the distal end of the flexible tube portion 8. The portion of the flexible tube 42 fixed to the flexible tube 8 is locally formed to have an inner diameter smaller than the outer diameter of the flexible tube 8, so that the base end of the flexible tube 42 is flexible. It is fitted and fixed to the tip of the tube portion 8. In this case, since the distal end hood 34 is the flexible tube body 42, the bending portion 7 can be bent without any inconvenience.

According to the first disclosed example, the following configuration is obtained. (Supplementary Note 24) A tip formed with a nozzle that is detachable from a tip component provided at a tip of an insertion portion to be inserted into a body cavity and that is formed with a nozzle that communicates with a fluid conduit opened at a tip surface of the tip component. In an endoscope having a cover member, the endoscope is provided with an uneven-thickness cylindrical distal end hood which is detachably attached to an outer peripheral surface of an insertion portion other than the distal end cover member, and is provided so as to protrude distally from the insertion portion. An endoscope characterized in that: (Supplementary note 25) The endoscope according to Supplementary note 24, wherein the distal end hood is attached to an outer peripheral surface of the distal end constituting portion of the insertion portion. (Supplementary note 26) The endoscope according to Supplementary note 24, wherein the distal end hood is attached to a hard portion on a distal end side of the endoscope. (Supplementary note 27) The endoscope according to Supplementary note 25, wherein an outer diameter of the distal end component to which the distal end hood is attached is formed to be substantially the same as an outer diameter of the distal end cover member. (Supplementary note 28) The endoscope according to Supplementary note 25, wherein an outer diameter of the distal end component to which the distal end hood is attached is formed to be larger than an outer diameter of the distal end cover member. (Supplementary note 29) The endoscope according to supplementary note 24, wherein the distal end hood is attached to an outer peripheral surface of a curved portion provided on a rear end side of a distal end component of the insertion portion. (Supplementary note 30) The endoscope according to Supplementary note 24, wherein the distal end hood is attached to an outer peripheral surface of an adhesive portion that adheres and fixes the curved portion of the insertion portion and the distal end component portion. (Supplementary note 31) The endoscope according to Supplementary note 30, wherein an outer diameter of the distal end cover member and an outer diameter of the distal end component portion are formed to be smaller than an outer diameter of the bonding portion. (Supplementary Note 32) The endoscope according to supplementary note 24, wherein the distal end hood is attached to an outer peripheral surface of a flexible tube portion having flexibility provided at a rear end side of the curved portion of the insertion portion. mirror. (Supplementary Note 33) The distal end hood is formed to have an inner diameter smaller than an outer diameter of a portion of the insertion portion of the endoscope to which the distal end hood is attached, and is crimped onto the insertion portion of the endoscope by elastic deformation of the distal end hood. Supplementary notes 24 to 3 characterized in that
3. The endoscope according to any one of 2. (Supplementary note 34) The supplementary notes 24 to 24, wherein the distal end hood is attached to the insertion portion of the endoscope by engagement by unevenness provided on at least a part of the distal end hood and the insertion portion of the endoscope. 32. The endoscope according to any of 32. (Supplementary note 35) The endoscope according to any one of supplementary notes 25 to 31, wherein the distal end hood is made of a hard resin. (Supplementary note 36) The endoscope according to any one of supplementary notes 25 to 32, wherein the distal end hood is made of a soft resin.

According to Supplementary Notes 24 to 36, since the distal end hood is not attached to the detachable distal end cover member but is attached to the insertion portion of the endoscope other than the distal end cover member, the distal end hood falls off together with the distal end cover member. In addition, the operability of attaching and detaching the tip cover member is not reduced.

According to Supplementary notes 27 to 28 and Supplementary note 31, when the tip hood is attached to the insertion portion other than the tip cover,
Since the tip cover member and the tip hood are not fixed to each other, the tip hood does not fall off together with the tip cover member.

According to Supplementary Notes 33 to 34, the tip hood is securely fixed to the insertion portion other than the tip cover by the elastic force of the tip hood or the unevenness provided on the insertion portion, and the tip hood falls off. Never.

In order to improve the operability when removing the detachable distal end cover member from the distal end portion of the endoscope, Japanese Patent Application Laid-Open No. 8-29700 discloses a method in which a finger or the like is hooked on a side surface of the distal end cover member. Are provided.

Since the body fluid such as gastric juice and blood easily accumulate in the finger-holding recess shown in Japanese Patent Application Laid-Open No. 8-29700 during the examination of the endoscope, it takes time and effort to sufficiently clean the body. There is. Further, in order to improve the operability of attaching and detaching the tip cover member, it is necessary to form the concave portion wide and deep so that a finger can enter therein, and in that case, cleaning is more troublesome.

FIG. 11 shows a distal end structure of an endoscope which solves the above-mentioned problem, in which the operability of attaching and detaching the distal end cover member is improved without providing a concave portion on the side surface of the distal end cover member. It is. FIG. 11 shows a second disclosure example, and the same components as those in the first to third embodiments and the first disclosure example are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 11, in the example of the present disclosure, a protrusion 35 is formed on the outer peripheral surface of the distal end cover member 15 so as to protrude in the outer peripheral direction and operates to attach and detach the distal end cover member 15.
Is provided. The protrusion 35 is desirably provided at the proximal end of the distal cover member 15, and may be provided on the entire circumference of the distal cover member 15 or may be provided on a part thereof.
It is desirable that the amount of protrusion of the protrusion 35 from the tip cover member 15 in the outer peripheral direction is in the range of 0.1 mm to 0.5 mm.

The ridge line of the projection 35 is smoothly chamfered so as not to form a corner or form an edge. In the illustrated example, the protrusion 35
Is tapered so that the diameter of the distal end cover member 15 gradually decreases toward the distal end side.

The tip cover member 15 may be made of an elastic soft resin such as fluorine rubber, polyurethane, or silicone rubber, or may be made of an elastic hard resin such as polysulfone, polycarbonate, PMMA, or polyphenylene sulfide. May be.

With the above-described configuration, as shown in FIG. 11C, the finger is hooked on the protrusion 35 and the tip cover member 15 is pulled out from the tip component 10 to the tip side as it is. Will be removed.

According to the embodiment of the present disclosure, by providing the projection 35 for attaching / detaching operation on the outer periphery of the tip cover member 15, the removal operation of the tip cover member 15 from the tip component 10 can be easily performed. Unlike the case where a concave portion for attachment / detachment operation is provided on the outer periphery of the distal end cover member 25, there is no possibility that dirt remains and accumulates in the concave portion, resulting in unsanitary condition and troublesome cleaning.

Also, since the protrusion amount of the protrusion 35 from the outer periphery of the distal end cover member 15 is within a range of 0.1 mm to 0.5 mm or the like to which a finger can be put, it is safe in the body cavity.
Further, since the protrusion 35 has the above-described protrusion amount, the bending portion 7
And the outer diameter of the distal end portion 6 of the endoscope 1 does not become larger than the curved portion 7, so that the insertability of the endoscope 1 does not decrease.

According to the second disclosed example, the following configuration is obtained. (Supplementary Note 37) A distal end formed with a nozzle that is detachable from a distal end component provided at the distal end of an insertion portion inserted into a body cavity and that communicates with a fluid conduit opened at the distal end surface of the distal end component. An endoscope having a cover member, wherein a projection is provided on at least a part of an outer peripheral surface of the distal end cover member. (Supplementary note 38) The endoscope according to supplementary note 37, wherein the protrusion is provided over the entire circumference of the distal end cover member. (Supplementary note 39) The endoscope according to any one of supplementary notes 37 and 38, wherein the protrusion is provided at a proximal end portion of the distal end cover member. (Supplementary note 40) The endoscope according to any one of Supplementary notes 37 to 39, wherein a ridge line of the protrusion is chamfered so as not to be a corner. (Supplementary note 41) The endoscope according to supplementary note 40, wherein the protrusion has a tapered shape whose diameter gradually decreases toward the distal end side. (Supplementary note 42) The supplementary note 37, wherein the protrusion amount of the protrusion from the front end cover member is 0.1 to 0.5 mm.
42. The endoscope according to any one of to 41. (Supplementary note 43) The endoscope according to any one of supplementary notes 37 to 42, wherein the distal end cover member is made of a hard resin. (Supplementary note 44) The endoscope according to any one of supplementary notes 37 to 42, wherein the distal end cover member is made of a soft resin. (Supplementary note 45) The supplementary note 37 to 44, wherein the protrusion is formed so as not to protrude from an outer diameter of a curved portion that bends the distal end side of the insertion portion of the endoscope. Endoscope.

According to Supplementary Notes 37 to 45, since the projection is provided on at least a part of the outer peripheral surface of the distal end cover member, the operability of attaching and detaching the distal end cover member is improved. Appendix 40
According to Nos. To 41, since the ridgeline of the projection is chamfered so as not to be a corner, the safety in the body cavity is improved.

According to Supplementary Note 42, since the amount of protrusion of the protrusion from the outer peripheral surface of the distal end cover member is within a range in which a finger can be hooked, it is safe in the body cavity and unlike the case where a recess is provided. There is no danger of waste remaining or becoming unsanitary, and there is no need for cleaning, and the endoscope does not have a large outer diameter and does not lower the insertability of the endoscope.

According to Supplementary Note 45, the projection provided on the distal end cover member is formed so as not to protrude beyond the outer diameter of the curved portion, so that the outer diameter of the distal end does not become large and the endoscope can be inserted easily. Is not reduced.

Further, in an endoscope having a distal end cover member detachably attached to the distal end portion of the endoscope and integrally provided with a nozzle, the rear end of the distal end cover member is in contact with the outer skin of the curved portion. There are things that are.

The distal cover member is generally made of a harder material than the outer cover of the curved portion. In this case, the outer cover of the curved portion may be damaged when the distal cover member is attached or detached. is expected.

FIG. 12 shows a distal end structure of an endoscope which solves the above-mentioned problem, and prevents the outer skin of the bending portion from being damaged at the time of attaching / detaching the distal end cover member. FIG. 12 shows a third disclosure example, in which the same components as those in the first to third embodiments and the first and second disclosure examples are assigned the same reference numerals and description thereof will be omitted.

The bending portion 7 connected to the rear end side of the front end portion 6
As shown in FIG. 12, one end of the outer skin 36 is
Is adhered and fixed to a part of the outer peripheral surface 10b (adhesive portion 37).

[0113] The bonding portion 37 is formed as shown in FIGS.
As shown in FIG. 2, the distal end portion 6 is provided at a certain distance a in the longitudinal direction or the radial direction of the distal end portion 6 from the rear end of the distal end cover member 15 inserted outside the distal end portion 10. This constant distance a is desirably 0.5 mm or more, which is substantially the same as the thickness of a human nail.

With the above-described configuration, the operator can use FIG.
The attachment / detachment operation of the distal end cover member 15 is performed in the same manner as in the second disclosure example shown in FIG. Since the rear end of the distal end cover member 15 is separated from the adhesive portion 37 by a constant distance a of at least 0.5 mm or more, the nail of the operator is attached to the outer skin 36 and the adhesive as shown in FIGS. There is no contact with the part 37.

According to the present disclosure, as shown in FIG. 12, when the user attaches / detaches the front cover member 15, the nail of the operator does not come into contact with the outer skin 36 and the adhesive portion 37 constituting the curved portion 7.
The outer skin 36 and the bonding portion 37 are not damaged.

Further, in the first to third embodiments and the first to third disclosed examples described above, the distal end forming section 10
Is made of a metal such as stainless steel, as shown in FIG. 13, an insulating insulating member 38 is provided on a portion of the tip component 10 where the metal is exposed, in order to prevent the metal portion of the tip 6 from being exposed. It may be coated.

The insulating member 38 may be made of a soft resin such as fluorine rubber, polyurethane, silicon rubber, or the like.
For example, polysulfone, polycarbonate, PMMA,
It may be made of a hard resin such as polyphenylene sulfide.

Further, even if the distal end cover member 15 to be fitted to the distal end component 10 is not formed in a cylindrical shape, FIG.
As shown in FIG. 5, a flow path 19 toward the observation window 14 is formed on the distal end surface 10a of the distal end component 10 and a projection 40 that is convex in the distal direction is provided, and a covering member 39 is detachably provided on the projection 40. May be. The covering member 39 may be fixed to the projection 40 by engagement of projections and depressions provided on the covering member 39 and the projection 40, or may be fixed by elastic deformation.
Both may be adhered and fixed with an adhesive material.

Further, as shown in FIG. 15, a flat portion 43 for positioning the front cover member 15 and the front end component 10 is provided.
44 may be provided on both sides. In this case, dirt accumulates and remains in the distal end cover member 15 as in the case where a concave portion is provided, or may cause danger as in the case where a protrusion is provided. There is no.

The present invention is not limited to the above-described first to third embodiments and the first to third disclosed examples. Naturally, the components of the embodiments and the disclosed examples may be rearranged, and various modifications may be made without departing from the spirit of the present invention.

[0121]

As described above, by providing the close contact means for keeping the opening of the fluid conduit and the nozzle in close communication with each other, the distal end component around the nozzle and the distal end cover member are brought into close contact with each other, and the nozzle cover and the nozzle cover are brought into close contact with each other. No extra gap is generated between the gaps, thereby preventing water leakage from the gap and air / water supply in a direction other than the desired direction.

Therefore, the momentum and efficiency of the injection decrease,
Water or the like remaining in the gap between the distal end component and the distal end cover member adheres to the observation window during the air supply, so that the visual field is not obstructed.

Further, by providing fixing means for fixing the distal end component and the distal end cover member in pressure contact with each other,
The effect of the adhesion means is further enhanced. As a secondary effect, there is no need to provide a step such as a convex portion in the vicinity of the opening of the fluid conduit at the distal end component, so that the nozzle and the peripheral portion of the nozzle can be easily cleaned. Therefore, the labor for cleaning is reduced, and the working efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of an endoscope according to a first embodiment of the present invention.

FIG. 2 is an exemplary view showing a distal end portion of the endoscope of the embodiment.

FIG. 3 is an exemplary sectional view showing a state in which the distal end cover member of the embodiment is withdrawn;

FIG. 4 is a sectional view taken along the line FF shown in FIG. 2;

FIG. 5 is a diagram showing a distal end portion of an endoscope according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a state in which a distal end cover member of the second embodiment shown in FIG. 5 is removed.

FIG. 7 is a view showing a distal end portion of an endoscope according to a third embodiment of the present invention.

FIG. 8 is a sectional view showing a first disclosed example of the endoscope.

FIG. 9 is a sectional view showing a modification of the first disclosure example shown in FIG. 8;

FIG. 10 is an exemplary perspective view showing a modification of the first disclosure example shown in FIG. 8;

FIG. 11 is a diagram showing a second disclosure example of the endoscope.

FIG. 12 is a sectional view showing a third disclosure example of the endoscope.

FIG. 13 shows first to third embodiments and first to third embodiments of the present invention.
FIG. 13 is a cross-sectional view of a distal end portion of an endoscope showing a modification of the third disclosure example.

FIG. 14 shows first to third embodiments and first to third embodiments of the present invention.
FIG. 13 is a perspective view of a distal end portion of an endoscope showing a modification of the third disclosure example.

FIG. 15 shows first to third embodiments and first to third embodiments of the present invention.
FIG. 13 is a perspective view of a distal end portion of an endoscope showing a modification of the third disclosure example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Endoscope 3 ... Insertion part 6 ... Tip part 10 ... Tip part 10a ... Tip surface 15 ... Tip cover member 16 ... Air supply / water supply port (fluid conduit) 20 ... Elastic body (close contact means) 22 ... Convex part (Fixing means) 23 ... Recess (Fixing means) 24 ... Nozzle 27 ... Nozzle 28 ... Elastic body (Close contact means) 30 ... Screw member (Fixing means) 32 ... Engaging part (Close contact means) 33 ... Protrusion (Close contact means) )

Claims (1)

[Claims] A nozzle is provided which is detachable from a distal end component provided at a distal end of an insertion portion inserted into a body cavity and communicates with a fluid conduit opened at a distal end surface of the distal end component. In an endoscope having a distal end cover member, a fixing means for fixing the distal end portion and the distal end cover member in a pressed state, and keeping a state in which the opening of the fluid conduit and the nozzle are in close communication with each other. An endoscope comprising a close unit.