JP2003284677A - Cover type endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accomplish washing easily and moreover, accurately in a wider range when pollutants or the like adhere to a transparent window provided on an endoscope cover to worsen the visual field of observation by forming arcuate outflow openings at a thick part of the tip body thereof with the transparent window of the cover made eccentric. <P>SOLUTION: A circular through hole 14a is formed at the hard cylinder part 14 of a tip body 11, a cover glass 15 is mounted on the through hole 14a and the through hole 14a is made eccentric to the hard cylinder part 14. The arcuate outflow openings 16 are provided at two points of a part with a larger thickness at the hard cylinder part 14 under the thickest part thereof as an opening shape retaining part 14b. In the range of angle, the whole of the outflow opening 16 covers almost 180° surrounding the tip hardened part 3a of the insertion tube 3. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover-type endoscope which is detachably attached to an insertion portion of an endoscope and is inserted into a body cavity or the like.

[0002]

2. Description of the Related Art Since an endoscope is inserted into a body cavity such as a human body, it is necessary to clean and disinfect each time it is used.
Moreover, it must be able to be completely sterilized. Since this cleaning and disinfection requires a lot of time and labor,
2. Description of the Related Art An endoscope, in particular, a so-called cover-type endoscope that is inserted into a body cavity or the like in a state in which the insertion portion is covered with a cover has been developed. The cover-type endoscope has a great advantage in that the endoscope can be reused without cleaning and disinfecting by replacing the cover.

[0003] Since an endoscope basically inspects the inside of a body cavity, as a minimum endoscope observation mechanism, an illuminating section for illuminating the inside of the body cavity and an illumination from this illuminating section are used. An observation section for observing the inside of the body cavity is attached to the distal end portion of the insertion section. If the observation part is not in a clean state when performing the observation with the insertion part inserted in the body cavity,
This will hinder the observation inside the body. Therefore, when the observation part is contaminated with body fluid or the like, cleaning is required. Further, when the inner wall of the body cavity to be examined is dirty, it is necessary to supply a perfusate composed of physiological saline or the like for perfusion. Therefore, a fluid supply mechanism must be provided in addition to the endoscope observation mechanism described above.

As described above, the endoscope is provided with the passage for supplying the fluid. However, since the passage is also polluted at the time of the endoscopic examination, when it is constructed as a cover-type endoscope. The above-mentioned passages are provided not on the endoscope side but on the cover side. As described above, the cover-type endoscope having the cover having the passage formed therein is, for example, an actual flat plate 6-6660.
No. 8 publication and the like. The cover of this known cover-type endoscope is configured by inserting an insertion section cover provided with an endoscope insertion channel and a multi-lumen tube having a plurality of channels into the inside of a cover outer skin. The passage provided in the tube is used as a forceps channel, an air supply path, and a water supply path.

Here, a cover glass is attached to the distal end portion of the endoscope insertion channel in the distal end constituent portion of the cover, and the multi-lumen tube penetrates the distal end constituent portion, and the distal end portion is treated. A tool channel opening portion and an air / water feeding channel opening portion are formed, and by flowing out a cleaning fluid from the air / water feeding channel opening portion, the cover glass of the endoscope inserted into the endoscope insertion channel is formed. The cleaning fluid is supplied to the position of the observation portion formed at the tip of the insertion portion so that the cleaning can be performed.

[0006]

By the way, in an ordinary type endoscope which is not attached to the cover, the observation section and the illumination section are arranged at the tip of the insertion section in an independent state. The cleaning fluid may be intensively supplied toward However, the cover glass attached to the tip of the cover in the cover-type endoscope is in contact with almost the entire tip surface of the insertion section including the observation section and the illumination section. Therefore, when a stain is attached to the cover glass, even if the stain is attached at a position distant from the observation part, the contaminant flows along the surface of the cover glass and immediately moves to the front of the observation part or its vicinity. Probability is high. Moreover,
Since the objective optical system attached to the observation section of the endoscope uses a wide-angle lens, even if the location of attachment of the contaminant on the surface of the cover glass is slightly away from the position of the observation section,
At least, it may adversely affect the observation visual field.

However, in the above-mentioned prior art, the structure is such that the cleaning fluid is concentratedly supplied to the front position of the observation portion on the surface of the cover glass, and is constructed as a cover-type endoscope. In such a case, there is a problem that a clear observation image may not always be obtained over the entire range of the observation visual field.

The present invention has been made in view of the above points, and an object of the present invention is to provide a transparent window provided on a cover when dirt or the like adheres to the observation field of view and deteriorates it.
It is to be able to easily and surely wash over a wide range.

[0009]

In order to achieve the above-mentioned object, the present invention provides a main body operation part connected to a base end part of an insertion part having a distal end hard part provided with an illumination part and an observation part. A cover-type endoscope including an endoscope and an endoscope cover that is detachably inserted into an insertion portion of the endoscope, wherein the endoscope cover has a rigid cylindrical body with a transparent window. A cover having a mounted tip body, a flexible sleeve that is connected to the tip body and covers the insertion portion, and a fastening portion formed of an elastic member that is connected to the proximal end portion of the flexible sleeve. The body portion and the mounting portion of the transparent window provided on the tip body are formed at eccentric positions, and at least one arc-shaped outflow opening is formed in a thick portion of the tip body, and Exterior sleeve made of a flexible member so as to surround the flexible sleeve. The Bed is mounted, it is to its characterized in that between the outer sleeve and the flexible sleeve has a configuration in which the supply passage of the fluid.

Here, between the flexible sleeve and the outer sleeve, the outer sleeve having higher strength is
It is desirable from the viewpoint of preventing damage to the outer surface. It is desirable that the outlet opening provided in the tip body cover as wide an angle as possible. However, if it is configured with a single outflow opening, it may collapse when it is pressed by an external force or the like. Therefore, if the outflow opening is divided into a plurality of arcuate shapes each having a predetermined angle and the opening shape holding portion is formed between the outflow openings, the shape retention of the outflow opening is improved. The outer tube can be composed of a thick outer tube and a thin film inner tube, and a fluid supply passage can be formed between them. The proximal end of this outer tube is located forward of the end of the flexible sleeve to form an end closure with a chamber at this end, connect the supply tube to this chamber and By connecting a liquid injection member to the other end of the tube, a fluid such as a washing liquid or a perfusate is supplied.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 (A) shows the entire configuration of an endoscope that constitutes the cover-type endoscope of the present invention, and FIG. 1 (B) shows the overall configuration of the endoscope cover, and FIG. 2 shows insertion of the endoscope. The tip part of a part is shown.

As is apparent from these figures, the endoscope 1
The main body operating section 2 is provided with an inserting section 3 for inserting into the body cavity, and the universal operating cord 4 is pulled out from the main body operating section 2. The insertion portion 3 is composed of a distal end hard portion 3a, an angle portion 3b, and a flexible portion 3c in order from the distal end side. And left and right).

The endoscope 1 has a distal end hard portion 3 of an insertion portion 3 thereof.
A pair of the illumination unit 6 and the observation unit 7 are provided on the tip surface of a. The exit end of the light guide faces the illumination unit 6, the objective lens is attached to the observation unit 7, and the solid-state image sensor (or image guide) is provided at the image forming position of the objective lens. . The endoscope observation mechanism is constituted by these, and the insertion portion 3 of the endoscope 1 has a small diameter in which only this endoscope observation mechanism is mounted. Since the internal structure itself of the endoscope observation mechanism and the entire insertion portion is well known, its illustration and detailed description are omitted.

The insertion portion 3 of the endoscope 1 has a circular cross section, and the distal end hard portion 3a provided with the endoscope observation mechanism is oriented in a desired direction by an angle operation. It is configured so that it can be inserted into the body cavity for inspection. However, if the insertion section 3 is directly inserted into the body, the surface of the insertion section 3 will be contaminated. Therefore, by covering the insertion section 3 with an endoscope cover, the insertion section 3 is prevented from being contaminated in the body cavity. .

In FIGS. 1 and 3, reference numeral 10 denotes an endoscope cover, and the endoscope cover 10 includes a tip body 11 and
It is composed of a flexible sleeve 12 and a fastening portion 13, and is attached to the insertion portion 3 of the endoscope 1 as shown in FIG. As is clear from FIGS. 4 and 5, the tip body 11 includes a hard cylindrical body 14 and a cover glass 15 as a transparent window mounted on the hard cylindrical body 14 so as to have an airtight structure. The hard tubular body 14 may be made of metal or the like, but is preferably made of a plastic material from the viewpoint of low cost of material, electrical insulation, and the like.

The flexible sleeve 12 is made of a resin material such as urethane resin or a rubber material which is excellent in flexibility in the bending direction and has some elasticity over the whole. Alternatively, at least the base end side portion is formed of a stretchable member. The flexible sleeve 12 can be configured in a relatively thin film shape or a sheet shape as long as it has a function of covering the insertion portion 3 of the endoscope 1. Further, the inner diameter of the flexible sleeve 12 is slightly larger than the outer diameter of the insertion portion 3, so that the insertion portion 3 can be easily inserted into the flexible sleeve 12.

The fastening portion 13 provided at the base end portion of the flexible sleeve 12 is for fixing to the connecting portion between the main body operating portion 2 and the insertion portion 3 of the endoscope 1, and therefore this fastening portion. The attachment portion 13 is formed of a member having a sufficiently large thickness as compared with the flexible sleeve 12. The fastening portion 13 is the endoscope 1
It is fixed to the connecting portion between the main body operating portion 2 and the insertion portion 3, and therefore, at the connecting portion, to the main body operating portion 2 side or the insertion portion 3 side, preferably to the main body operating portion 2 of the flexible portion 3c. A cover locking portion 8 made of a hard ring member is attached so as to be brought into contact with the tip end portion of the cover rubber 3d that covers the connecting portion.

Regarding the locking structure between the fastening portion 13 and the cover locking portion 8, for example, as shown in FIG. 6, a circle formed on the outer surface of the cover locking portion 8 provided on the endoscope 1 side. It is composed of an annular locking projection 8a and a locking groove 13a provided in the fastening portion 13, and the locking groove 13a is detachably connected to the locking projection 8a by a snap action action. There is. Therefore, the fastening portion 13 is formed of an elastic member such as plastic or rubber. In addition to this, various structures such as a bayonet system and a lure lock system can be adopted as the structure of the locking mechanism of the fastening portion 13 to the endoscope 1. The point is that the fastening portion 13 may be detachably connected to the connecting portion between the main body operating portion 2 and the insertion portion 3 of the endoscope 1 or the vicinity thereof, and may be fixedly held in the connected state.

Here, as shown in FIG. 1, the length from the distal end surface of the distal end hard portion 3a in the insertion portion 3 of the endoscope 1 to the locking projection 8a of the cover locking portion 8 is L1, When the total length of the endoscope cover 10, that is, the length from the inner surface of the cover glass 15 to the locking groove 13a in the fastening portion 13 is L2, L1 is longer than L2. However, this dimensional difference is about several percent. As a result, when the endoscope cover 10 is attached to the insertion portion 3 of the endoscope 1, the flexible sleeve 12 of the endoscope cover 10 is pulled, and the cover glass 15 of the flexible sleeve 12 is inserted. It is brought into pressure contact with the tip end surface of the tip end hard portion 3a so that no air gap is generated therebetween. As a result, there will be no inconvenience that the illumination light from the illumination unit 6 is reflected on the inner surface of the cover glass 15 and enters the observation unit 7 as harmful light. Further, since the above-described dimensional difference is about several percent, the flexible sleeve 12 receives the minimum tension necessary to bring the distal end hard portion 3a and the cover glass 15 into close contact with each other.
The flexibility in the bending direction does not decrease significantly, and there is no particular hindrance when bending the angle portion 3b.

As described above, the endoscope cover 10 is provided with the outer tube 20 so as to surround the flexible sleeve 12 into which the insertion portion 3 of the endoscope 1 is inserted. The outer tube 20 is for forming a passage for supplying a fluid. Therefore, the endoscope cover 10 has a function of covering the insertion portion 3 so as not to be contaminated, and also supplies a cleaning liquid for ensuring a visual field of the observation portion 6 and a perfusion liquid for perfusing the body cavity. The function to do is added.

For this purpose, the rigid cylindrical portion 14 of the tip body 11 is
A circular through hole 14a is formed in this hole.
The cover glass 15 is attached to a. Here, the through hole 14a is eccentric with respect to the hard cylinder portion 14, so that the thickness of the hard cylinder portion 14 continuously changes in the circumferential direction. Further, two arc-shaped outflow openings 16 are provided in a portion of the hard cylinder portion 14 having a large wall thickness. Each of these outflow openings 16 is formed at a predetermined angle on both the left and right sides slightly apart from this position with the thickest part as a boundary.

By thus dividing the outflow opening 16 into two parts, the length of these openings, that is, the arc angle in the circumferential direction, can be made relatively small, and the opening can be made over a large angle. . Between these two outflow openings 16 and 16, there is a wall portion of the rigid tubular portion of these outflow openings 16, and this wall portion functions as the opening shape holding portion 14b, whereby the outflow opening 16 is provided. The shape is maintained so that it does not collapse. Here, it is desirable that the entire angle range of the outflow openings 16 provided at two positions occupy an angle close to 180 ° around the distal end hard portion 3a of the insertion portion 3. However, it is not necessary to exceed 180 °. The number of divisions of the outflow opening 16 is not limited to two.

A connecting tube portion 14c is extended around the through hole 14a of the hard tube portion 14 so as to project toward the base end side, and the flexible sleeve 1 is attached to the connecting tube portion 14c.
The tip ends of the two are fitted and fixed by means such as adhesion. The flexible sleeve 12 is covered with an outer sleeve 20. The outer sleeve 20 is made of a tubular member having two layers of inner and outer layers, and the inner sleeve 20a is made of a thin film. The tip end of the outer sleeve 20 is fitted to the flexible sleeve 12 and fixed by means such as adhesion. . On the other hand, the outer sleeve 20
The b is made of a member having a larger wall thickness than the inner sleeve 20a and the flexible sleeve 12, and has the highest rigidity. The tip of the outer sleeve 20b of the outer sleeve 20 that constitutes the outer sleeve 20 has a rigid tubular portion 1
It is fixed to the outer peripheral surface of No. 4.

As described above, a gap exists between the inner sleeve 20a and the outer sleeve 20b at the portion of the outer sleeve 20 that faces the outflow opening 16. This gap exists on the thick side of the hard tubular portion 14, and this gap forms the fluid supply passage 21.

Next, the base end portion of the outer sleeve 20 is shown in FIG.
As shown in FIG.
The a is fixed to the inner surface of the outer sleeve 20b. The base end portion of the outer sleeve 20b has an outwardly bulging portion 22b.
Is formed, and a hollow portion is provided inside the bulging portion 22, and the hollow portion serves as an inflow chamber 23. The connection pipe 2 is provided in the inflow chamber 23.
4 is connected, and the other end of the connection pipe 24 is connected to the supply tube 25. This supply tube 25
A liquid injection member 26 is connected to the base end of the. Here, the position of the base end portion of the exterior sleeve 20 is up to the middle of the flexible portion 3c of the insertion portion 3, and the position thereof is the insertion portion 3
Of these, it is desirable to set it at a position where it is not substantially inserted into the body cavity or a position in the vicinity thereof.

The liquid injection member 26 is a cylindrical member, and a liquid pressure feeding means such as a syringe is attached to the opening at the tip end thereof. The liquid injection member 26 is detachably fixed to a holder 27 connected to the fastening portion 13 of the endoscope cover 10. The holder 27 has a substantially C shape, and the liquid injection member 26 is sandwiched by the holder 27. Further, the liquid injection member 26 is prevented from rotating with respect to the holder 27. For this,
A chamfered portion is formed at one location on the outer peripheral surface of the liquid injection member 26, and a flat portion 27a corresponding to the chamfered portion is formed on the holder 27 as shown in FIG.
Therefore, when mounting the liquid injection member 26 on the holder 27, the liquid injection member 26 is fitted with a liquid pressure feeding means such as a syringe by fitting the chamfered part into the flat part 27a so that the chamfered parts are aligned with each other. There is no possibility that the liquid injection member 26 will be displaced even if a force in the rotational direction is applied when the liquid is injected. The slit-shaped gap of the C-shaped holder 27 is preferably larger than the outer diameter of the supply tube 25.

The endoscope cover 10 configured as described above.
The insertion portion 3 of the endoscope 1 is inserted into the flexible sleeve 12. That is, the tip portion of the insertion portion 3 of the endoscope 1 is inserted into the fastening portion 13. Here, since the inner diameter of the fastening portion 13 is larger than the outer diameter of the insertion portion 3, it can be easily inserted into the inside thereof. The inner diameter of the flexible sleeve 12 is also larger than the outer diameter of the insertion portion 3, and the tip body 11
The inner diameter of the hard tubular portion 14 constituting the above also has a diameter difference that allows the insertion portion 3 to be loosely fitted. Therefore, the insertion portion 3 is smoothly inserted into the flexible sleeve 12.

When the insertion portion 3 is inserted to a position where the tip hard portion 3a comes into contact with the inner surface of the cover glass 15, the engagement groove 13a in the attachment portion 13 engages with the cover engagement portion 8 to which it is attached. It does not reach the position of the stop protrusion 8a. Therefore, the fastening portion 13 is pulled toward the main body operating portion 2 side of the endoscope 1. As a result, the flexible sleeve 12 is stretched, and the fastening portion 13 rides on the cover locking portion 8. Then, by expanding the inner diameter portion of the fastening portion 13, the locking groove 13a provided in the fastening portion 13 fits into the locking projection 8b, so that the endoscope cover 10 is inserted into the insertion portion 3. It is installed.

Since the flexible sleeve 12 is under tension when the endoscope cover 10 is incorporated in the endoscope 1, the distal end hard portion 3a of the insertion portion 3 is pressed against the cover glass 15. In close contact. Therefore, no gap is created between the illumination unit 6 and the observation unit 7 and the cover glass 15,
It is possible to prevent inconvenience such that the reflection of the illumination light emitted from the illumination unit 6 enters the observation unit 7 as harmful light, and a good observation visual field can be secured. Although the flexible sleeve 12 is covered by the outer sleeve 20, the flexible sleeve 12
Is not fixed to the outer sleeve 20,
Moreover, since the end portion of the outer sleeve 20 reaches the middle position of the flexible sleeve 12, the outer sleeve 2
No tension acts on the 0 side.

A supply tube 25 connected to the end of the outer sleeve 20 extends along the surface of the flexible sleeve 12. A liquid injection member 26 is provided at the end of the supply tube 25.
Are connected, and the liquid injection member 26 is fixed by being fitted into a holder 27 provided in the fastening portion 13.

In the endoscope 1 thus equipped with the endoscope cover 10, the insertion portion 3 is inserted into the body cavity and an endoscopic examination is performed. This inspection is performed by observing the inner wall of the body cavity and the like via the observation unit 7 under the illumination from the illumination unit 6 provided on the distal end hard portion 3a. Then, by operating the operation knob 5 to bend the angle portion 3b in an appropriate direction, the observation visual field can be changed. At the time of this operation, not only the angled portion 3b of the insertion portion 3 but also the flexible sleeve 12 and the outer sleeve 20 are bent. However, since these are flexible in the bending direction, the endoscope cover 10 is not provided. Although the operation force is slightly increased as compared with the case, there is no particular hindrance to the operability of the bending operation.

Contamination such as body fluid in the body cavity is caused by the endoscope cover 1
However, since the endoscope 1 is in a hermetically sealed state, there is no possibility that contaminants will adhere to the insertion portion 3 located inside the body cavity. The contaminants also adhere to the outer surface of the cover glass 15, and as a result, the observation field of view inside the body cavity deteriorates. When such a situation occurs, means for pumping the cleaning liquid, such as a syringe, is connected to the liquid injection member 26, and the cleaning liquid is supplied from the liquid injection member 26 to the inflow chamber 23 via the supply tube 25 and the connection pipe 24. The cleaning liquid supplied to the inflow chamber 23 passes through the supply passage 21 formed between the inner and outer sleeves 20 a and 20 b of the outer sleeve 20, and passes through the hard tubular portion 1 of the tip body 11.
The contaminants adhering to the outer surface of the cover glass 15 can be washed away by flowing out through the outflow opening 16 provided on the cover glass 4 and flowing along the surface of the cover glass 15. Further, since the outflow opening 16 is formed over an angle close to 180 ° around the hard cylindrical portion 14, the cleaning liquid is spread over almost the entire cover glass 15, so that the entire cover glass 15 can be effectively cleaned. You can Moreover, the outflow opening 16 is opened at a wide angle, but since it is divided into two parts, there is no possibility of crushing or the like causing uneven supply of the cleaning liquid.

By the way, as described above, the cover glass 1
In order to clean the whole of 5, the cleaning liquid has to flow along the surface of the cover glass 15. For this purpose, the supply pressure of the cleaning liquid by the cleaning liquid pressure-feeding means such as a syringe is weakened. As a result, the cleaning liquid does not squirt forward from the outflow opening 16 but oozes out from the outflow opening 16. This causes the cleaning liquid to flow along the surface of the cover glass 15.
In order to ensure that the cleaning liquid is directed toward the cover glass 15, a nozzle for guiding the flow direction of the cleaning liquid can be attached to the outflow opening 16.

The cleaning liquid flowing out from the outflow opening 16 flows in the direction of gravity. Therefore, unless the outflow opening 16 is located above, the cleaning liquid cannot be applied to the entire surface of the cover glass 15. The gravity direction of the cleaning liquid flowing out from the outflow opening 16 differs depending on the posture of the subject who undergoes the endoscopic examination and the direction of the insertion portion 3. The tip body 11 and the insertion portion 3 in the endoscope cover 10
Since it is possible to adjust the position in the rotational direction with respect to the distal end hard portion 3a, the outflow opening 16 is inserted in the body cavity.
It suffices to adjust the position when the cover is attached so that the arrow is directed upward in the direction of gravity and then insert the cover into the body cavity.

The fluid flowing out from the outflow opening 16 may be a perfusate or the like in the body cavity in addition to the above-mentioned washing solution. For example, in order to perfuse the inner wall of the body cavity being observed by the endoscope observation mechanism, it is advantageous to inject the perfusate from the outflow opening 16 at a certain pressure. Therefore,
The supply pressure of the perfusate from the perfusate pumping means attached to the liquid inflow member 26 is increased. Here, the cleaning liquid can be supplied by a syringe or the like, but unlike the cleaning liquid, the perfusion liquid often has a high supply pressure and a large supply amount. Therefore, it may be desirable to use a pump to pump the perfusate. That is, by connecting a supply pipe to the supply tank for the perfusion liquid, providing a pump on this supply pipe, connecting the tip of the supply pipe to the liquid injection member 26, and controlling the operation of the pump. ,
The supply of perfusate can be controlled.

Whether the syringe is connected to the liquid injection member 26 or the pipe from the tank is connected, the fluid supply control is required. The liquid injection member 26 is detachably fixed to a holder 27 attached to the fastening portion 13 of the endoscope cover 10 connected to the endoscope 1. The holder 27 is C-shaped and has a slit structure. By making the width of the slit portion larger than the outer diameter of the supply tube 25, the liquid injection member 26 can be pulled out from the holder 27 and then separated from the slit portion. As a result, the liquid injection member 26 is attached to the endoscope 1
Therefore, the liquid injection work can be performed not by the operator of the endoscope 1 but by the assistant or the like.

As described above, by mounting the endoscope cover 10 capable of supplying fluid to the insertion portion 3 of the endoscope 1,
This is advantageous in the case of inspecting the inner wall of the body cavity where there is an adhered substance, and in the case of inspecting the site where the surface of the cover glass 15 is likely to be contaminated by being filled with body fluid or the like. Of course, after the endoscope inspection is performed, if the endoscope cover 10 is separated, the endoscope 1 itself can be reused without performing work such as cleaning.

Although the nozzle for directing the cleaning liquid to the cover glass can be attached to the outflow opening as described above, a member such as a check valve can also be attached. Although the outer sleeve is composed of the inner and outer double sleeves, only the member corresponding to the outer sleeve is provided and the supply passage is formed between the outer sleeve and the flexible sleeve. You can also And
When the exterior sleeve of this single layer structure is provided and the check valve is attached to the outflow opening, the suction means is connected to the liquid injection member so that the suction means applies a negative pressure to the supply passage. In this case, the flexible sleeve swells and comes into close contact with the outer sleeve. As a result, since the inner diameter of the flexible sleeve is increased, the work of inserting the insertion portion becomes easier.

[0039]

As described above, according to the present invention, the mounting portion of the transparent window provided in the tip body is formed in an eccentric position, and the arc-shaped outflow opening is formed in the thick portion of the tip body. Since it was formed, when dirt or the like adheres to the transparent window provided on the cover and the observation field of view deteriorates, it is possible to easily
Moreover, there is an effect that it can be surely washed over a wide range.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing an endoscope and a first endoscope cover.

FIG. 2 is an external view of a distal end surface of a hard distal end portion in the insertion portion of the endoscope.

FIG. 3 is an external view showing a state in which an endoscope cover is incorporated in the endoscope.

FIG. 4 is an enlarged cross-sectional view of the tip portion of FIG.

5 is a sectional view taken along line XX of FIG.

FIG. 6 is a cross-sectional view showing a locking structure of a fastening portion of an endoscope cover.

FIG. 7 is a cross-sectional view showing a base end portion of an exterior sleeve of the endoscope cover.

FIG. 8 is a partial vertical cross-sectional view of a fastening portion of the endoscope cover.

[Explanation of symbols]

1 Endoscope 2 Main body operation part 3 Insertion part 3a Tip hard part 6 Illumination section 7 Observation section 8 Cover locking part 9 Mounting part 10 Endoscope cover 11 Tip body 12 flexible sleeve 13 fastening part 14 Hard cylinder 15 Cover glass 16 Outflow opening 20 Exterior sleeve 20a inner sleeve 20b outer sleeve 21 supply passage 22 bulge 23 inflow chamber 25 supply tube 26 Liquid Injection Member 27 Holder

Claims (4)

[Claims] 1. An endoscope in which a main body operation section is connected to a proximal end portion of an insertion section having a distal end hard section provided with an illumination section and an observation section, and detachably attachable to the insertion section of the endoscope. In a cover-type endoscope including an inserted endoscope cover, the endoscope cover is connected to the distal end main body in which a transparent window is attached to a hard cylindrical body, and covers the insertion part. A cover main body having a flexible sleeve and a fastening portion formed of an elastic member connected to the base end of the flexible sleeve, and the transparent window mounting portion provided on the distal end main body are eccentric. The tip body and at least one
A circular arc-shaped outlet opening is formed, and an outer sleeve made of a flexible member is mounted so as to surround the flexible sleeve, and the outer sleeve and the flexible sleeve are separated from each other. A cover-type endoscope characterized in that it is configured as a fluid supply passage. 2. The cover endoscope according to claim 1, wherein the flexible sleeve and the outer sleeve have higher strength than the outer sleeve. 3. The outflow opening is formed of a plurality of arcuate shapes having a predetermined angle, thereby forming an opening shape holding portion between the outflow openings. The cover-type endoscope described. 4. The outer tube is composed of a thick outer tube and a thin film inner tube to form the fluid supply passage therebetween, and a proximal end portion of the outer tube is an end of the flexible sleeve. And a liquid supply member is connected to the other end of the supply tube by forming an end closed portion having a chamber at the end of the supply tube, and by connecting the liquid injection member to the other end of the supply tube. The cover-type endoscope according to claim 1, wherein: