JPH08191791A - Cover-type endoscope - Google Patents

Abstract

PURPOSE: To prevent trouble in washing such as air-blowing and water-supplying even when positions of head faces of a head constituting part vary due to loose ness by a fixing method in fixing an endoscope cover and an endoscope to be covered and size dispersion of parts in manufacturing, by using a simple constitution. CONSTITUTION: A head cover member 14 is provided with an engaging claw 32 so as to be engaged with a groove part 31 of a head constituting part 8, and is covered by an outer coating 30, and stress from the engaging claw 32 is operated inside the radius direction by means of elastic power of the head cover member 14 near the engaging claw 32. Even when the gap on the engaging face of the engaging claw 32 with the groove part 31 is generated due to parts dispersion or the like, the gap is made 0.5mm or less. The head constituting part 8 is provided with a butt part 33, and thus, the cover-type endoscope has such a constitution that the head face of the head constituting part 8 is on the same face as the head of the head cover member 14 when a supporting part 22 which is provided on rim part of an opening part 21 of the head cover member and the butt part 33 are in contact with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope for a cover having an observation window and an illumination window in the distal end portion of the tip, and an insertion portion of the endoscope for the cover is externally inserted and an air / water feeding nozzle is provided on the distal end surface. The present invention relates to a cover-type endoscope including an endoscope cover having a distal end cover member provided with.

[0002]

2. Description of the Related Art Conventionally, an endoscope used for observing the inside of a human body is one in which a protective tube is put over the insertion portion in order to prevent body fluid or the like from adhering to the insertion portion into the body cavity. It has been known. After using the endoscope, the protective tube is removed and replaced with a new protective tube. Therefore, it is possible to prevent the insertion portions from being contaminated, and it is not necessary to wash them, and the labor of washing can be saved.

Specifically, for example, USP 4,809,6
As shown in FIG. 2 of 78, there is one in which the entire insertion portion is covered with a cover provided with a transparent portion on the front surface of the observation optical system.
The fixing of the insertion portion cover and the endoscope insertion portion is performed by the frictional force of the elastic end provided on the cover proximal side.

As shown in FIG. 3 of USP 4,809,678, a replaceable distal end cover is provided at the distal end of the endoscope, and by the frictional force of the elastic end of the insert cover, the distal end of which is open around the proximal side of the distal end cover. Some are fixed. No details are given on how to fix the tip cover to the tip of the endoscope.

Apart from this, as in Japanese Utility Model Laid-Open No. 58-74212 and Japanese Utility Model Laid-Open No. 58-77318, a type in which the insertion section cover having the front surface of the observation optical system opened is watertightly fixed from the outer surface by a separate locking body. Things have been proposed.

Further, in Japanese Patent Application No. 5-111872, a seal member is provided between the distal end cover member of the endoscope cover and the distal end constituent portion of the cover endoscope to fix them. Furthermore, Japanese Patent Application No. 5-176971 and USP 5,1
In 93 and 525, the observation window and the illumination window portion are projected,
It is disclosed that the endoscope cover is fixed by being fitted in an opening corresponding to the above-mentioned portion provided at the tip of the endoscope cover.

[0007]

However, in Japanese Utility Model Laid-Open No. Sho 58-74212, the cover endoscope and the endoscope cover are fixed in a watertight state from the outside by a separate locking body. In Japanese Patent Application No. 5-111872, the seal member fixes the distal end portion of the cover endoscope in a watertight state. However, these conventional techniques may not reliably hold the fixed state of both. In other words, there is a possibility that both will move in the axial direction, and not only the optical defect such as being seen, but also the tip surface of the tip component moves from the tip surface of the tip cover member to the inside and outside. In such a case, the effect of stable air / water supply cannot be obtained, and further, depending on the amount of movement, water / air supply may not be performed as desired, and there is a risk that cleaning and drainage may occur.

Further, Japanese Patent Application No. 5-176971 and CPU
In Nos. 5,193,525, since the observation window, the illumination window and the opening at the tip of the tip cover member are fitted to each other, a step or a gap is generated around the observation window and the illumination window, and the residual water after the water supply is at that portion. It is more likely to occur, and there is a possibility that an optical defect such as water droplets being visible in the visual field or water covering the entire observation window may occur.

The present invention has been made in view of the above circumstances, and has a simple structure, which causes rattling due to a fixing method when the endoscope cover and the endoscope for a cover are fixed, and a component during manufacturing. An object of the present invention is to provide a cover-type endoscope that does not cause troubles in cleaning such as air supply and water supply even if the position of the front end surface of the front end configuration portion changes due to dimensional variation.

[0010]

SUMMARY OF THE INVENTION A cover-type endoscope according to the present invention is a cover-type endoscope having an observation window and an illumination window in a distal end-constituting portion, and insertion of the cover-type endoscope. The endoscope cover having a tip cover member provided with an air / water feeding nozzle on the tip end surface and having an opening at the tip end facing the observation window and the illumination window. In the cover-type endoscope, the tip end surface position of the tip forming portion and the mouth height position of the air / water feeding nozzle are placed at the same position with respect to the insertion direction, or the mouth height position of the air / water feeding nozzle. Is positioned at the tip, the position of the tip surface of the tip component may fluctuate due to rattling due to the fixing method when fixing the endoscope cover and the cover endoscope, and variations in the dimensions of parts during manufacturing. However, it is necessary to prevent problems with cleaning such as air supply and water supply. And ability.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 relate to a first embodiment of the present invention, and FIG. 1 is an overall view showing the construction of a cover type endoscope, FIG.
Is a configuration diagram showing the configuration of the tip end surface of the tip cover member of FIG. 1,
3 is a cross-sectional view showing the shape of the air / water supply nozzle of FIG. 2, FIG.
2 is a cross-sectional view showing a cross section taken along the line AA of FIG. 2 in the first state in which the cover endoscope is attached, and FIG. 5 is a line AA in FIG. 2 in the second state in which the cover endoscope is attached. Sectional drawing which shows a cross section, FIG. 6 is explanatory drawing explaining the effect | action of the air supply / water supply nozzle in the 1st state shown in FIG. 4, FIG. 7 is the air supply / water supply nozzle in the 2nd state shown in FIG. It is explanatory drawing explaining the effect | action of.

(Structure) A cover-type endoscope 2 according to a first embodiment shown in FIG. 1 is an endoscope cover endoscope (hereinafter referred to as a cover endoscope) composed of an electronic endoscope. 3 and a channel-equipped endoscope cover (hereinafter abbreviated as an endoscope cover) 4 to which the cover endoscope 3 is attached.

The cover endoscope 3 has a flexible insertion portion 5.
And an operation section 6 provided at the rear end of the insertion section 5, and a universal cord 7 extended from the operation section 6. A tip forming portion 8 is provided at the tip of the cover endoscope 3.

On the other hand, the contamination preventing endoscope cover 4 covering the cover endoscope 3 is composed of an insertion portion cover portion 11, an operation portion cover 12 and a universal cord cover 13, and the tip forming portion 8 is provided. A tip cover member 14 is provided at the tip of the insertion portion cover portion 11 so as to cover the. All of these parts of the endoscope cover 4 are those that have been sterilized in advance before being used for the endoscopic examination, and are discarded after being used for the endoscopic examination.

The insertion portion cover portion 11 is composed of a portion of the endoscope cover 4 that covers the insertion portion 5 of the cover endoscope 3 and a portion that covers the vicinity of the base end thereof.

The operation portion cover 12 is a cover portion that covers the operation portion 6 of the cover endoscope 3. The universal cord cover 13 is a portion that covers the universal cord 7 of the cover endoscope 3.

As shown in FIG. 2, an opening 21 is provided on the tip surface of the tip cover member 14, and the positioning of the tip forming portion 8 and the tip cover member 14 is performed at the edge of the opening 21 of the tip cover member 6. Is provided with a support portion 22.

The tip forming section 5 has an observation window 23 and an illumination window 24, and illumination light from a light source device (not shown) is transmitted to a light guide (not shown) which is inserted into the insertion portion 5 of the cover endoscope 3. The observation window (not shown) is irradiated from the illumination window 24, and the return light is made incident through the observation window 23.

On the other hand, at the tip of the tip cover member 14, there is an air / water feed nozzle 25 provided so that the air / water feed direction is the direction in which the observation window 23 is located. A cutout portion 26 is provided on the outer peripheral surface. Further, the tip cover member 14 is attached to the insertion portion cover portion 11.
A treatment instrument channel 27 is provided which is opened at the tip of the treatment instrument and allows a treatment instrument or the like to be inserted therethrough. Here, the air / water nozzle 25
As shown in FIG. 3, which is an enlarged cross section, the air / water feeding angle is 0 ° to 10 ° with respect to the tip surface of the tip cover member 14.
It is formed so that.

As shown in FIG. 4, which is a sectional view taken along the line AA of FIG. 2, a groove 31 is provided in the tip forming portion 8, and a locking claw is provided on the tip cover member 14 so as to engage with the groove 31. 32
Is provided, the tip cover member 14 is covered with the outer cover 30, and when the locking claw 32 is pressed outward in the radial direction,
The tip cover member 14 near the locking claw 32 that supports the locking claw 32 is elastically deformable. In this case, the gap is less than 0.5 mm even if a gap is generated on the engagement surface of the locking claw 32 and the groove 31 due to variations in parts or the like.

Further, the tip forming portion 8 and the tip cover member 14
In order to position, the tip forming portion 8 is provided with an abutting portion 33, and when the abutting portion 33 comes into contact with the support portion 22 provided at the edge of the opening 21 of the tip cover member 6, The distal end surface of the component 8 and the distal end surface of the distal end cover member 14 are flush with each other.

The return light from the observation site (not shown) that has entered through the observation window 23 is picked up by the image pickup section 35 via the objective lens system 34, and the image pickup signal is transmitted through the inside of the insertion section 5 by the image pickup cable 36. Image output device (not shown)
The image of the observed region is displayed on a monitor (not shown) after being output to the digital camera and signal-processed.

(Operation) In the cover-type endoscope 2 thus constructed, the abutting portion 33 pushes up the locking claw 32 in the radial direction when it is mounted on the distal-end constituting portion 8 and the distal-end cover member 14. The locking claw 32 is inserted in a state of being pushed up in the radial direction, and the elastic force of the tip end cover member 14 supporting the locking claw 32 near the locking claw 32 works, so that the locking claw 32 moves into the groove portion 31. Engage to complete insertion.

When the insertion is completed and the tip forming portion 8 is mounted on the tip cover member 14, there may be a gap due to variations in the dimensions of the locking claw 32 and the groove 31. Due to this gap, the tip forming portion 8 moves in the axial direction with respect to the tip cover member 14, but as shown in FIG. 4, the amount of movement toward the tip side in the axial direction is the abutting portion 3 provided in the tip forming portion 8.
3 is regulated by the contact between the support portion 22 and the support portion 22, and the tip forming portion 8
The front end surface of the is substantially flush with the front end surface of the front cover member 14. Further, the movement toward the base end side in the axial direction is restricted by the engagement between the locking claw 32 and the groove portion 31, as shown in FIG. That is, the movement amount of the tip forming portion 8 is regulated within 0.5 mm.

On the tip surface of the tip forming portion 8 that moves relative to the tip surface of the tip cover member 14, the air / water feeding nozzle 25 provided in the tip cover member 14 has a gas / water feeding angle as shown in FIG. Is 0 ° to 10 °, the water flow (or airflow) 41 flows out substantially parallel to the tip surface of the tip forming portion 8 as shown in FIGS. 6 and 7, and therefore, as shown in FIG. Even when the tip end surface and the tip end surface of the tip end cover member 14 are substantially flush with each other, as shown in FIG.
Even if there is a step between the tip cover member 14 and the tip cover member 14, it has the effect of reliably supplying air and water to the observation window portion.

The opening 21 has an observation window 23 and an illumination window 2.
By forming the common opening 21 apart from the edge of No. 4, there is no gap or step around the observation window 23 and the illumination window 24 due to the fitting of the tip component 8 and the tip cover member 14, and the observation window 23, Residual water is less likely to occur near the lighting window 24.

Further, since the notch portion 26 is provided on the outer peripheral surface of the tip cover member 14, the water and the air discharged from the air / water feeding nozzle 25 are supplied to the tip surface of the tip forming portion 8 and the tip cover member 14.
It is hard to remain on the tip surface.

(Effect) Therefore, in the cover-type endoscope 2 of the present embodiment, the distal end cover member 14 on the distal end surface of the distal end constituting portion 8 is used.
Since the movement of the position with respect to the front end surface of the blade is regulated inward and the air / water supply nozzle 25 that matches the position is used, even if there is some rattling in the fixing of the tip forming portion 8 and the tip cover member 14, the cleaning is performed. The ability can be fully secured. In other words, even if there is some rattling in the fixing method, there is an effect that there is no problem in the cleaning ability.

Further, the opening 21 is used as an observation window 23 and an illumination window 2.
By making the opening 21 large in common with the four parts, there is an effect that residual water is unlikely to occur near the observation window 23 and an optical defect such as being blocked by the field of view is less likely to occur.

Further, the notch 2 is provided at the end of the tip cover member 8.
Providing 6 has the effect of further improving drainage.

Next, the second embodiment will be described. FIG.
14 to 14 relate to the second embodiment of the present invention, FIG. 8 is a configuration diagram showing a configuration of a distal end surface of a distal end cover member, and FIG. 9 is a sectional view taken along line BB of FIG. 8 with a cover endoscope attached. 8 is a cross-sectional view showing the shape of the air / water supply nozzle of FIG. 8, and FIG. 11 is a cross-sectional view showing the cross section taken along the line AA of FIG. 8 in the first state in which the endoscope for a cover is attached. 12 is a cross-sectional view showing a cross section taken along the line AA of FIG. 8 in the second state in which the endoscope for a cover is attached, and FIG. 13 shows the action of the air / water feeding nozzle in the first state shown in FIG. FIG. 14 is an explanatory diagram for explaining, and FIG. 14 is an explanatory diagram for explaining the action of the air / water feeding nozzle in the second state shown in FIG. Since the second embodiment is almost the same as the first embodiment, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

(Structure) In the second embodiment, as shown in FIG. 8, in the opening 21 of the tip cover member 14, a supporting portion 22a is provided in a portion other than the flow path for air and water supply, and B- in FIG.
As shown in FIG. 9 which is a sectional view taken along the line B, an abutting portion 33 is provided at a portion of the tip forming portion 8 facing the supporting portion 22a.

Further, the tip of the tip cover member 14 is provided with an air / water feeding nozzle 25. As shown in FIG. 10, the air / water feeding nozzle 25 has an air / water feeding angle of 15 ° and a nozzle base height of 0. It is set to 0.5 mm or more.

When the supporting portion 22a and the abutting portion 33 are in contact with each other, as shown in FIG.
Is 0.5 mm from the tip surface of the tip cover member 14.
As shown in FIG. 12, the locking claw 3 is configured to project.
Even if the tip engaging portion 8 moves a little toward the base end side in the axial direction when a gap is generated between the surfaces engaged with the groove 2 and the groove portion 31 and the engagement is not sufficient, the tip of the worst tip cover member 14 is the worst. The surface and the tip surface of the tip forming portion 8 are configured to be substantially the same surface.

The other structure is the same as that of the first embodiment.

(Operation) In this embodiment, the abutting portion 33,
The support portion 22a, the locking claw 32, and the groove portion 31 operate in the same manner as in the first embodiment, and the amount of movement of the tip surface of the tip forming portion 8 is within 0.5 mm outward from the tip surface of the tip cover member 14. Regulated.

Next, on the tip surface of the tip forming portion 8 that moves relative to the tip surface of the tip cover member 14, the air / water feeding nozzle 25 provided in the tip cover member 14 has an air / water feeding angle of 15 ° and an observation window 23. For this, air and water will be supplied obliquely.

That is, when the tip forming portion 8 as shown in FIG. 13 projects from the tip cover member 14, water (or air) is once applied to the tip surface of the tip forming portion 8 and then the observation window 23 is placed. The water flow (air flow) 41 passes through.

When the tip forming portion 8 and the tip cover member 14 are on the same surface as shown in FIG. 14, the water flow (air flow) 41 by the air / water feeding nozzle 25 directly hits the observation window 23.

Incidentally, the tip forming portion 8 and the tip cover member 14
Even when the surfaces of and are in the middle of FIG. 13 and FIG. 14, they operate as shown in FIG.

Other functions are the same as those in the first embodiment.

(Effect) Therefore, according to the present embodiment, the movement of the position of the front end surface of the front end forming portion 8 with respect to the front end surface of the front end cover member 14 is restricted to the outside of the front end surface, and the cleaning ability is provided in that range. By providing the air / water nozzle 25,
Similar to the first embodiment, even if there is some rattling in the fixing of the tip forming portion 8 and the tip cover member 14, the washing ability can be sufficiently secured. In other words, even if there is some rattling in the fixing method, there is an effect that there is no problem in the cleaning ability.

Further, since the fluctuation range of the position of the tip surface is regulated in the direction in which the tip surface of the tip forming portion 8 projects from the tip surface of the tip cover member 14, the tip surface of the tip forming portion 8 and the tip cover member are controlled. Since a drop occurs at the boundary between the tip surface of 14 and water, water easily flows from the tip surface of the tip forming portion 8 to the outside, and residual water is less likely to occur.

Next, a third embodiment will be described. FIG.
5 to 20 relate to a third embodiment of the present invention, and FIG.
16 is a configuration diagram showing the configuration of the front end surface of the front cover member, FIG.
15 is a cross-sectional view showing a cross section taken along line C-C of FIG. 15 with the cover endoscope attached, and FIG. 17 is a cross-sectional view showing a cross section taken along line AA of FIG. 15 in the first state with the cover endoscope attached. , FIG. 18
Is in a second state in which the cover endoscope is attached, as shown in FIG.
FIG. 19 is a cross-sectional view showing a cross section taken along line AA of FIG. 19, FIG. 19 is an explanatory view for explaining the action of the air / water feeding nozzle in the second state shown in FIG. 18, and FIG. 20 is a first state shown in FIG. It is explanatory drawing explaining the effect | action of the air supply water supply nozzle of. The third embodiment is the first
Since it is almost the same as the embodiment, only different configurations will be described, the same configurations will be assigned the same reference numerals, and description thereof will be omitted.

(Structure) In the third embodiment, as shown in FIG. 15, in the tip cover member 14, an air / water supply nozzle 25 that is long enough not to enter the visual field for observation is installed so as to cover the opening 21. . In this case, the air / water nozzle 2
5 serves as the support portion 22 in the first embodiment.

When the tip surface of the tip forming portion 8 abuts on the air / water feeding nozzle 25, the tip surface of the tip forming portion 8 is flush with the tip surface of the tip cover member 14, as shown in FIG. As shown in FIG. 17, the movement of the distal end forming portion 8 toward the base end side in the axial direction is prevented by the locking claw 32.
It is configured to be regulated by contact between the groove 31 and the groove 31.
The other structure is the same as that of the first embodiment.

(Operation) In this embodiment, by the same operation as in the first embodiment, when the tip forming portion 8 is completely inserted into the tip cover member 14, the tip forming portion 8 and the tip cover member 14 are locked by the locking claw 32. It is fixed by the engagement of the groove 31 with the groove 31. At this time, a gap is generated on the surface where the locking claw 32 and the groove portion 31 are engaged with each other due to the variation in the dimensions of the parts due to the fitting relationship. Due to this gap, the tip forming portion 8 is fixed to the tip cover member 14
Although it moves in the axial direction, the amount of movement toward the tip end side in the axial direction is regulated by the contact between the tip end surface of the tip forming portion 8 and the air / water feeding nozzle 25, as shown in FIG.
The front end surface of the is the same as the front end surface of the front end cover member 14.

Further, the locking claw 32 is used for the movement toward the base end side in the axial direction.
It is regulated by the engagement of the groove 32 with the groove 32. That is, the movement amount of the tip forming portion 8 is regulated within 0.5 mm (see FIG. 17).

The air / water nozzle 25 installed so as to cover the opening 21 is different from the case where the tip surface of the tip forming portion 8 is flush with the tip surface of the tip cover member 14 as shown in FIG. In the case where there is a step due to the fitting of the tip forming portion 8 and the tip cover member 14 as shown in FIG. 20, obstacles such as the step are avoided, and the observation window 23 is formed by the water flow 41 (air flow).
There is an effect that can directly supply air and water.

Other functions are the same as those in the first embodiment.

(Effect) Therefore, according to the present embodiment, the movement of the position of the tip surface of the tip forming portion 8 with respect to the tip surface of the tip cover member 14 is made to be inside the tip surface, and the air / water supply having the cleaning ability in that range. Since the nozzle 25 is provided, the tip forming portion 8
Even if there is a rattling of about 0.5 mm in the fixing of the tip cover member 14, the washing ability and the water draining ability can be sufficiently secured.

Further, since the air / water supply nozzle 25 is elongated and brought closer to the observation window 23, air / water can be directly supplied to the observation window 23, and the tip cover member 14 and the tip forming portion 8 are fitted together. It is possible to avoid obstacles such as steps and gaps due to the combination, and to improve the washability and drainage.

In the present embodiment, the same effect can be obtained by extending the mouth portion of the air / water supply nozzle 25 without covering the entire opening 21 with a long nozzle.

Next, a fourth embodiment will be described. Figure 2
1 to 27 relate to a fourth embodiment of the present invention, and FIG.
22 is a configuration diagram showing the configuration of the front end surface of the front cover member, FIG.
21 is a cross-sectional view showing the cross section taken along the line AA of FIG. 21 with the cover endoscope attached, and FIG. 23 is a cross sectional view showing the cross section taken along the line AA of FIG. 21 is a cross-sectional view showing a cross section taken along the line AA of FIG. 21 in a state where the cover endoscope is completely attached, and FIG. 25 is A- in FIG. 21 of the first modification of the distal end cover member to which the cover endoscope is attached. FIG. 26 is a cross-sectional view showing a cross section taken along line A, FIG. 26 is a configuration diagram showing a configuration of a side-view-type tip cover member that is a second modification of the tip cover member in which the cover endoscope is mounted, and FIG. It is sectional drawing which shows the DD sectional view. Since the fourth embodiment is almost the same as the first embodiment, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

(Structure) In this embodiment, as shown in FIG. 21, the structure of the front end surface of the front end cover member 14 is the same as that of the first embodiment, and is a sectional view taken along line AA of FIG.
As shown in FIG. 5, the tip cover member 14 is fitted with the fixing pin 51 and the fixing pin 51 instead of the locking claw 32 that engages with the groove 31 provided in the tip forming portion 8 in the first embodiment. A hole 52 is provided. Further, the fixing pin 51 is the outer skin 30.
Is elastically deformed, the elastic force is transmitted. Here, the gap between the fitting of the fixing pin 51 and the hole portion 52 and the fitting of the fixing pin 51 and the groove 31 is set to be within 0.5 mm including the component variation.

Further, at this time, when the tip forming portion 8 moves toward the tip side in the axial direction, the tip end surface of the tip forming portion 8 is substantially flush with the tip surface of the tip cover member 14 when the amount of movement is maximum. Has been done. In FIG. 21, one of the two air / water supply nozzles 25 farther from the observation window 23 is dedicated to water supply.

The other structure is the same as that of the first embodiment.

(Operation) In this embodiment, when the tip forming portion 8 is inserted into the tip cover member 14, as shown in FIG.
The inclined surface at the tip of the tip forming portion 8 pushes up the fixing pin 51 and is inserted, the insertion of the tip forming portion 8 proceeds further, and the outer skin 3
When the fixing pin 51 is pushed toward the center by the elastic force of 0 and the fixing pin 51 is fitted into the groove 31, as shown in FIG. 24, the fixing of the tip forming portion 8 and the tip cover member 14 is completed.

When the fixing of the tip forming portion 8 and the tip cover member 14 is completed, there is a gap in the portion where the fixing pin 51 and the groove portion 31 are fitted, and the tip forming portion 8 is different from the tip cover member 14 in the gap. Move in the axial direction. At this time, when it moves toward the tip end side in the axial direction, the tip end surface of the tip forming portion 8 becomes substantially flush with the tip end surface of the tip cover member 14 (see FIG. 22), and also moves toward the base end side in the axial direction. In this case, the tip surface of the tip forming portion 8 can be regulated so that the tip surface of the tip forming member 8 is 0.5 mm inside from the tip surface of the tip cover member 14 (FIG. 24).
reference).

On the tip surface of the tip forming portion 8 that moves relative to the tip surface of the tip cover member 14, the air / water feeding nozzle 25 provided in the tip cover member 14 has the same function as that of the first embodiment.

(Effect) Therefore, according to the present embodiment, the movement amount of the position of the tip surface of the tip forming portion 8 with respect to the tip surface of the tip cover member 14 is restricted within the cleaning ability range of the air / water nozzle 25. Even if there is a rattling of about 0.5 mm in the fixation between the tip forming portion 8 and the tip cover member 14, the washing ability and the water draining ability can be sufficiently secured as in the first embodiment.

Further, since the support portion 22 is not provided at the edge of the opening 21, the opening 21 can be made large, and the tip cover member 14 that causes residual water in the vicinity of the observation window 23 and the illumination window 24. There is no gap or step due to the fitting with the tip forming portion 8.

Incidentally, in the air / water supply nozzle 25, the one farther from the observation window 23 is used as the water supply nozzle, so that even if residual water occurs at the mouth of the nozzle, the possibility that the residual water will be in the field of view is further reduced. .

Further, in the above-mentioned first to fourth embodiments, as shown in FIG. 25, the distal end cover member 14 is provided with the treatment instrument channel 2.
By providing a through hole 55 in the space into which the tip cover member 14 and the tip forming portion 8 of the tip cover member 14 are inserted, water and dirt that have entered the tip covering member 14 between the tip forming portion 8 are passed through the treatment instrument channel 27. Can be recovered and removed.

Further, in the side-view type endoscope, FIG.
And as shown in FIG. 27 which is a cross section taken along the line D-D of FIG.
By providing the communication port 55 between the channel opening 27a of the treatment instrument channel 27 and the space into which the distal end forming member 8 is inserted into the distal end cover member 14, the connecting hole 55 is inserted between the distal end forming member 8 and the distal end cover member 14. Since water or dirt can be collected from the suction tube 56 that is inserted into the treatment instrument channel 27 through the channel opening 27a from the conduction port 55, the drainage on the observation window 23 and the illumination window 24 becomes better.

Next, a fifth embodiment will be described. Figure 2
8 to 30 relate to a fifth embodiment of the present invention, and FIG.
Is a sectional view showing the structure of the tip cover member, and FIG.
28 is a cross-sectional view showing how the cover endoscope is attached to the distal end cover member, and FIG. 30 is an enlarged view for explaining the action of the groove portion and the locking claw of FIG. Since the fifth embodiment is almost the same as the first embodiment, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

(Structure) In the present embodiment, the tip forming portion 8 is provided with the groove portion 61, and the tip cover member 14 is provided with the locking claw 62 so as to engage with the groove portion 61, and at least the engaging portion. The periphery of the pawl 62 is formed of an elastic member.

Further, an opening 21 is provided on the tip end surface of the tip cover member 14, and the abutting portion 3 is attached to the tip end forming portion 8 for positioning the tip end constituting portion 9 and the tip cover member 14.
3 is a support portion 2 at the edge of the opening 21 of the tip cover member 14.
2 are provided.

The tip side of the groove portion 61 on the substrate side is an inclined surface, and the locking claw 62 is also provided with an inclined surface so as to engage with this inclined surface.

Further, the distance between the support portion 22 and the locking claw 62 is set shorter than the distance between the abutting portion 33 and the groove portion 61.

The other structure is the same as that of the first embodiment.

(Operation) In this embodiment having the above-described structure, when the distal end forming portion 8 is mounted on the distal end cover member 14, as shown in FIG. Is pushed up in the radial direction to be inserted and locked in the groove portion 61, whereby the mounting is completed.

When the mounting is completed, the distance from the support portion 22 to the locking claw 62 is shorter than the distance between the abutting portion 33 and the groove portion 71, so that the periphery of the locking claw 62 is elastically deformed to the locking claw 62. The groove 61 is engaged.

In this case, the locking claw 62 presses the groove 61 in the direction of the arrow in FIG. 30 by the elastic force of the elastic deformation. Then, the tip forming portion 8 is pressed in the radial direction at the tip end side in the axial direction, and the abutting portion 33 forms the support portion 22, and the surface of the tip forming portion 8 on the radial center side and the radial center side of the tip cover member 14. The surface of is in close contact.

The other operations are the same as those in the first embodiment.

(Effect) Therefore, in the present embodiment, the tip forming portion 8 and the tip cover member 14 are in close contact with each other on the side of the air / water feeding nozzle 25, so that there is no gap between them and there is a portion which becomes an obstacle during air / water feeding. There is an effect that stable air supply and water supply can be performed as in the first embodiment.

Next, a sixth embodiment will be described. FIG.
FIG. 1 is a sectional view showing a structure of a tip cover member according to a sixth embodiment of the present invention. Since the sixth embodiment is almost the same as the fifth embodiment, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

(Structure) In this embodiment, similarly to the fifth embodiment, the tip forming portion 8 has a groove portion 61, and a locking claw 62 is provided on the tip cover member 14 so as to engage with the groove portion 61. Has been. In this case, the tip forming section 8 and the tip cover member 14 are configured to be positioned by the contact between the butting section 33 and the support section 22 and the engagement between the locking claw 62 and the groove section 61.

A magnet 71 is provided on the outer peripheral surface of the tip forming portion 8.
The front end cover member 14 is provided with a magnet 71 facing the magnet 71 and a magnet 72 oriented to generate an attractive force.

The other structure is the same as that of the fifth embodiment.

(Operation) In this embodiment, when the tip forming portion 8 is inserted into the tip cover member 14, it engages with the locking claw 62 and the groove 61. At that time, the movement is restricted by the contact between the abutting portion 33 and the support portion 22 on the axial front end side, the tip forming portion 8 and the tip cover member 14 are positioned, and the tip forming portion 8 and the tip cover member 14 are fixed. Complete. Further, the distal end constituting portion 8 and the distal end cover member 14 are brought into close contact with each other by the attractive force due to the magnetic force of the magnets 71 and 72.

The other actions and effects are the same as in the fifth embodiment.

Even if the magnets 71 and 72 do not have a magnetic force, the same effect can be obtained by providing an adhesive substance instead of the magnets.

Next, a seventh embodiment will be described. FIG.
FIG. 2 is a sectional view showing the structure of the distal end cover member according to the seventh embodiment of the present invention. Since the seventh embodiment is almost the same as the fifth embodiment, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

(Structure) In this embodiment, in place of the locking claw 62 and the groove 61 of the fifth embodiment, the tip cover member 14 is provided with a screw portion 81 for penetrating the prepared hole, and the tip cover is also provided. A through hole 82 is provided in a portion of the outer cover 30 provided on the outer periphery of the member 14 that faces the female screw portion 81.
A fixing screw 83 is attached to the female screw portion 81 and the through hole 82 from the outside. The screw portion length of the fixing screw 83 is longer than the thickness of the outer cover 30, the thickness of the tip cover member 14, and the total length of the tip cover member 14 and the tip constituting portion 8.

The other structure is the same as that of the fifth embodiment.

(Operation) In this embodiment, the tip forming portion 8 and the tip cover member 14 are inserted, the abutting portion 33 contacts the support portion 22, and the tip end surface of the tip forming portion 8 and the tip cover member 14 are made. After positioning with the tip surface, the fixing screw 83 is externally tightened to press the tip forming portion 8 toward the center in the radial direction, and the tip cover member 14 is brought into close contact with the fixing screw 83 to fix them. , Fixed.

The other operations and effects are the same as in the fifth embodiment.

Next, the eighth embodiment will be described. FIG.
FIG. 3 is a sectional view showing the structure of the tip cover member according to the eighth embodiment of the present invention. Since the eighth embodiment is almost the same as the fifth embodiment, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

(Structure) In the present embodiment, the tip cover member 8
A notch 91 is provided on the entire outer peripheral portion of the tip surface of the, and the notch 91 is provided with an O-ring 92 for externally inserting the tip component 8 and the tip cover member 14.

The other structure is the same as that of the fifth embodiment.

(Operation) In this embodiment, the locking claw 62
The engagement between the groove portion 61 and the groove portion 61 and the contact between the support portion 22 and the butting portion 33 completes the fixing of the tip forming portion 8 and the tip cover member 14. After that, by externally inserting the O-ring 92 into the cutout portion 91, the O-ring 92 presses the tip forming portion 8 and the tip cover member 14 by its elastic force to bring them into close contact with each other.

The other actions and effects are the same as in the fifth embodiment.

Needless to say, the present invention is not limited to the above-described embodiments, but can be recombined between the embodiments without departing from the gist of the invention.

[Supplementary Notes] (Supplementary Note 1) A cover endoscope having an observation window and an illumination window in the distal end portion of the distal end and an insertion portion of the cover endoscope are externally inserted, and the observation is performed at the distal end. A cover-type endoscope comprising an opening at a portion facing a window and the illumination window, and an endoscope cover having a tip cover member having an air / water feeding nozzle on a tip surface thereof, wherein the tip configuration is provided. The tip end surface position of the portion and the mouth height position of the air / water feeding nozzle are placed in the same direction with respect to the insertion direction, or the mouth height position of the air / water feeding nozzle is located at the tip. Cover-type endoscope.

(Additional Item 2) An additional item 1 is characterized in that the distal end surface of the distal end forming portion and the distal end surface of the distal end cover member are provided on the same plane or with a regulating means for forming a step. The cover-type endoscope described in.

(Additional Item 3) The restricting means is a contact surface in the insertion direction provided between the distal end forming portion and the distal end cover member, and at least one uneven portion in the circumferential direction. The cover-type endoscope according to appendix 2.

(Additional Item 4) The cover type endoscope according to Additional Item 2, wherein the regulating means is a part of the distal end forming portion and the air / water feeding nozzle.

(Additional Item 5) An endoscope for a cover having an observation window and an illumination window in a distal end constituting portion of the tip and an insertion portion of the endoscope for a cover are externally inserted, and the observation window and the A cover-type endoscope having an endoscope cover having an opening at a portion facing the illumination window and having a tip cover member provided with an air / water feeding nozzle on the tip surface, wherein the inside of the tip cover member is provided. A cover-type endoscope in which at least a part of the distal end constituting portion is in close contact.

(Additional Item 6) An endoscope for a cover having an observation window and an illumination window in the distal end forming portion of the tip and an insertion portion of the endoscope for a cover are externally inserted, and the observation window and the A cover-type endoscope having an endoscope cover having an opening at a portion facing the illumination window and having a tip cover member provided with an air / water feeding nozzle on the tip surface, wherein the inside of the tip cover member is provided. In at least a part of the above, the cover-type endoscope is characterized in that the tip forming portion is in close contact with the air / water feeding nozzle side.

(Supplementary Note 7) An endoscope for a cover having an observation window and an illumination window in the distal end portion of the distal end portion, and an insertion portion of the endoscope for a cover are externally inserted, and the observation window and the illumination are provided at the distal end. A cover-type endoscope including an opening provided at a portion facing a window and having a tip end cover member provided with an air / water feed nozzle on a tip end surface thereof, wherein the tip end cover member is provided. In the cover type characterized in that a step is provided between the tip cover member and the tip forming portion in a portion from the air feeding / water feeding nozzle to the observation window on the tip forming portion, and the air feeding / water feeding nozzle matching the step is provided. Endoscope.

(Additional Item 8) The inside of the cover type according to Additional Item 7, wherein the step formed by the tip cover member and the tip forming portion is regulated so that the tip forming portion is located inside. Endoscope.

(Additional Item 9) The inside of the cover type according to Additional Item 7, wherein the step formed by the tip cover member and the tip forming portion is regulated so that the tip forming portion is on the outside. Endoscope.

(Additional Item 10) The cover-type endoscope according to Additional Item 8, wherein the air / water feeding angle of the air / water feeding nozzle is 0 ° to 10 °.

(Additional Item 11) The cover endoscope according to Additional Item 9, wherein the air / water feeding angle of the air / water feeding nozzle is 15 °.

(Additional Item 12) A regulation means for regulating the position of the tip surface of the tip forming portion is provided, and the regulation means is a support portion provided in the opening of the tip cover member and an outer periphery of the tip forming portion. The cover-type endoscope as set forth in appendix 7, wherein the cover-type endoscope is configured to abut against the abutting portion provided on the.

(Additional Item 13) The cover endoscope according to Additional Item 12, wherein the supporting portion is provided around the entire circumference of the opening.

(Additional Item 14) The cover endoscope according to Additional Item 12, wherein the support portion is provided in a part of the opening.

(Additional Item 15) The cover-type endoscope according to Additional Item 14, wherein the support portion is provided in a portion other than a portion through which water or a gas passes during air / water feeding.

(Additional Item 16) By providing the air / water feeding nozzle in a state of covering the opening portion, the air / water feeding nozzle serves as the support portion for regulating the position of the tip forming portion. 13. The cover-type endoscope according to item 12, which is a feature.

(Additional Item 17) In the step formed by the distal end cover member and the distal end constituent portion, the distal end constituent portion is always inside the opening portion. The cover-type endoscope described in.

(Additional Item 18) In the step formed by the distal end cover member and the distal end constituent portion, the distal end constituent portion is always outside the opening. The cover-type endoscope described in.

(Additional Item 19) The additional item 8, wherein the step formed by the tip cover member and the tip forming portion is regulated so that the tip forming portion is less than 0.5 mm inward. The cover type endoscope according to any one of 12 and 17.

(Additional Item 20) The additional item 8 characterized in that the step formed by the distal end cover member and the distal end constituting portion is restricted so that the distal end constituting portion is outwardly less than 0.5 mm. The cover type endoscope according to any one of 12 and 17.

(Additional Item 21) The cover according to Additional Item 7, wherein a portion of the distal end cover member facing the observation window and the illumination window is opened by one common opening portion. Type endoscope.

(Additional Item 22) The cover-type endoscope according to Additional Item 7, wherein when there are a plurality of air / water feeding nozzles, the one farther from the observation window is for water feeding.

(Additional Item 23) The cover type endoscope according to Additional Item 7, wherein in the distal end cover member, a cutout portion is provided on the outer peripheral surface of the distal end cover member so that water is drained well.

(Additional Item 24) The additional item 2 characterized in that the notch is provided on the downstream side of the air / water feeding nozzle.
The cover-type endoscope according to item 3.

(Additional Item 25) In the above-mentioned distal end cover member, the distal end cover member is not provided on the downstream side of the air / water feeding nozzle in order to prevent water drainage on the distal end cover member. The cover-type endoscope described.

(Additional Item 26) An endoscope for a cover having an observation window and an illumination window in a distal end portion of the distal end portion and an insertion portion of the endoscope for a cover are externally inserted, and the observation window and the illumination are provided at the distal end. A cover-type endoscope which is provided with an opening at a portion facing a window and has a tip end surface provided with an air-feeding and water-feeding nozzle on a tip end cover member in combination with an endoscope cover. A cover-type endoscope characterized in that the tip cover member is in close contact with the air / water nozzle side so as not to interfere with the air / water feed at the tip surface.

(Additional Item 27) The cover-type endoscope according to Additional Item 26, wherein the distal end forming portion and the distal end cover member are in close contact with each other due to the elastic force of the distal end cover member.

(Additional Item 28) The cover endoscope according to Additional Item 26, wherein the distal end forming portion and the distal end cover member are in close contact with each other by an external locking means.

(Additional Item 29) The cover type according to Additional Item 28, characterized in that the distal end constituting portion 5 and the distal end cover member are in close contact with each other by externally tightening the distal end constituting portion 5 with an elastic member. Endoscope.

(Additional Item 30) The cover-type endoscope according to Additional Item 28, wherein the distal end cover member and the distal end constituting portion are brought into close contact with each other by screws from the outside.

(Additional Item 31) The cover-type endoscope according to Additional Item 27, wherein the distal end forming portion and the distal end cover member are in close contact with each other by magnetic force.

(Additional Item 32) The cover endoscope according to Additional Item 27, wherein the distal end forming portion and the distal end cover member are in close contact with each other by an adhesive force.

(Additional Item 33) The cover endoscope according to Additional Item 29, wherein the elastic member is an O-ring.

[0129]

As described above, according to the cover-type endoscope of the present invention, the position of the tip surface of the tip forming portion and the position of the mouth of the air / water feeding nozzle are placed at the same position with respect to the insertion direction. Alternatively, since the mouth-height position of the air / water supply nozzle is located at the tip, rattling due to the fixing method when fixing the endoscope cover and the cover endoscope, and the size of parts during manufacturing Even if the position of the tip surface of the tip component changes due to variations,
This is effective in that no trouble occurs in washing such as air supply and water supply.

[Brief description of drawings]

FIG. 1 is an overall view showing a configuration of a cover-type endoscope according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration of a tip surface of a tip cover member of FIG.

FIG. 3 is a cross-sectional view showing the shape of the air / water supply nozzle of FIG.

FIG. 4 is a cross-sectional view showing a cross section taken along line AA of FIG. 2 in a first state in which the cover endoscope is attached.

5 is a cross-sectional view showing a cross section taken along line AA of FIG. 2 in a second state in which the endoscope for a cover is attached.

FIG. 6 is an explanatory view for explaining the action of the air / water supply nozzle in the first state shown in FIG.

FIG. 7 is an explanatory view for explaining the action of the air / water supply nozzle in the second state shown in FIG.

FIG. 8 is a configuration diagram showing a configuration of a front end surface of a front end cover member according to a second embodiment of the present invention.

9 is a cross-sectional view showing a cross section taken along the line BB of FIG. 8 in which a cover endoscope is attached.

10 is a cross-sectional view showing the shape of the air / water supply nozzle of FIG.

FIG. 11 is a cross-sectional view showing a cross section taken along line AA of FIG. 8 in a first state in which the cover endoscope is attached.

FIG. 12 is a cross-sectional view showing a cross section taken along the line AA of FIG. 8 in a second state in which the endoscope for a cover is attached.

FIG. 13 is an explanatory view for explaining the action of the air / water supply nozzle in the first state shown in FIG. 11.

FIG. 14 is an explanatory view for explaining the action of the air / water supply nozzle in the second state shown in FIG.

FIG. 15 is a configuration diagram showing a configuration of a front end surface of a front end cover member according to a third embodiment of the present invention.

16 is a cross-sectional view showing a cross section taken along the line CC of FIG. 15 in which the endoscope for a cover is attached.

17 is a cross-sectional view showing a cross section taken along the line AA of FIG. 15 in a first state in which the cover endoscope is attached.

18 is a cross-sectional view showing a cross section taken along the line AA of FIG. 15 in a second state in which the endoscope for a cover is attached.

FIG. 19 is an explanatory view for explaining the action of the air / water supply nozzle in the second state shown in FIG.

20 is an explanatory view for explaining the action of the air / water supply nozzle in the first state shown in FIG.

FIG. 21 is a configuration diagram showing a configuration of a tip surface of a tip cover member according to a fourth embodiment of the present invention.

22 is a cross-sectional view showing a cross section taken along the line AA of FIG. 21 in which the cover endoscope is attached.

FIG. 23 is a view showing a state in which the cover endoscope is started to be mounted;
Sectional drawing which shows the AA line cross section of 1

FIG. 24 is a view showing a state where the cover endoscope is completely attached;
Sectional drawing which shows the AA line cross section of 1

FIG. 25 is a cross-sectional view showing a cross section taken along the line AA in FIG. 21 of the first modified example of the distal end cover member having the cover endoscope attached thereto.

FIG. 26 is a configuration diagram showing a configuration of a side-view-type tip cover member that is a second modified example of the tip cover member having the cover endoscope attached thereto.

27 is a cross-sectional view showing a cross section taken along line DD of FIG.

FIG. 28 is a cross-sectional view showing the structure of the tip cover member according to the fifth embodiment of the present invention.

FIG. 29 is a cross-sectional view showing a state in which the cover endoscope is attached to the distal end cover member of FIG. 28.

FIG. 30 is an enlarged view for explaining the action of the groove portion and the locking claw of FIG. 28.

FIG. 31 is a cross-sectional view showing the structure of the tip cover member according to the sixth embodiment of the present invention.

FIG. 32 is a cross-sectional view showing the structure of the tip cover member according to the seventh embodiment of the present invention.

FIG. 33 is a cross-sectional view showing the configuration of the tip cover member according to the eighth embodiment of the present invention.

[Explanation of symbols]

 2 ... Cover-type endoscope 3 ... Cover endoscope 4 ... Endoscope cover 5 ... Insertion part 6 ... Operation part 7 ... Universal code 8 ... Tip configuration part 11 ... Insertion part cover part 12 ... Operation part cover 13 ... Universal cord cover 14 ... Tip cover member 21 ... Opening 22, 22a ... Support 23 ... Observation window 24 ... Illumination window 25 ... Air / water nozzle 26, 91 ... Notch 27 ... Treatment tool channel 27a ... Treatment tool channel opening 30 ... Outer skin 31, 61 ... Groove portion 32, 62 ... Locking claw 33 ... Abutting portion 34 ... Objective lens system 35 ... Imaging portion 36 ... Imaging cable 41 ... Water flow 51 ... Fixing pin 52 ... Hole 55 ... Conducting port 56 ... Suction tubes 71, 72 ... Magnet 81 ... Female thread portion 82 ... Through hole 83 ... Fixing screw 92 ... O-ring

Claims (1)

[Claims] 1. An endoscope for a cover having an observation window and an illumination window in a distal end forming portion of the tip, an insertion portion of the endoscope for a cover is externally inserted, and the observation window and the illumination window are provided at the distal end. A cover-type endoscope including an endoscope cover having a tip cover member having an air / water feeding nozzle on the tip surface and having an opening at the tip surface position of the tip forming portion. A cover-type endoscope characterized in that the mouth-height position of the air-water-feeding nozzle is placed at the same position as the insertion direction, or the mouth-height position of the air-water-feeding nozzle is located at the tip.