JPH05103749A - Endoscope - Google Patents

Abstract

PURPOSE:To facilitate the work of precisely turning the opening part of an injection nozzle to an observing window at the time of mounting a top end cover onto a top end constituting part and facilitate the work of mounting the top end cover onto the top end constituting part. CONSTITUTION:A top end constituting part 7 has a protruding part 75 forming a part of the injection pipeline of an injection nozzle 18, and a top end cover 73 has a recessed part which is fitted to the protruding part 75 and connected to the protruding part 75 to form the residual part of the injection pipeline of the injection nozzle 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope having an improved structure of a tip end portion provided with an injection nozzle for supplying air and water.

[0002]

2. Description of the Related Art Generally, an endoscope has an injection nozzle attached to an exposed surface of a distal end forming portion of an insertion portion to be inserted into a body cavity. The observation window is cleaned. In this case, in the conventional injection nozzle, for example, a stainless steel nozzle main body is inserted into the nozzle mounting hole formed in the tip forming portion,
It was fixed with an adhesive.

By the way, the opening of the injection nozzle is formed to be thinner than the narrow air / water supply passage on the hand side in order to forcefully supply air / water. Therefore, the opening of the injection nozzle is likely to be clogged with minute foreign matter or dirt, and it is difficult to easily remove the minute foreign matter or dirt once clogged with the opening of the ejection nozzle.

Therefore, it has been necessary to replace the injection nozzle or clean the air / water supply passage as a countermeasure against the clogging of minute foreign matter and dirt on the opening of the injection nozzle. As a measure against clogging of the opening of the injection nozzle, for example,
As shown in Japanese Utility Model Unexamined Publication No. Sho 64-9804, an injection nozzle is integrally provided in a tip cover attached to the tip forming portion, and the tip cover integrally formed with the injection nozzle is provided in the tip forming portion. In contrast, there is one in which the attachment / detachment can be easily performed, and the operations such as replacement and cleaning of the injection nozzle can be easily performed without disassembling the endoscope.

Further, as disclosed in Japanese Utility Model Application Laid-Open No. 53-134591, a tip cover made of an elastic material integrally formed with an injection nozzle is detachably fitted to the tip forming portion. There is one that easily removes the clogging and the like clogging the inside of the injection nozzle and can immediately use it again.

[0006]

However, in the construction of Japanese Utility Model Laid-Open No. 9804/1988, only the tip cover is fitted and fixed to the tip forming portion, and therefore the work of fixing the tip cover to the tip forming portion is performed. Occasionally, it takes a lot of time to correctly orient the opening of the injection nozzle toward the observation window. Even if the tip cover is fixed to the tip component with the opening of the injection nozzle properly oriented in the direction of the observation window, the tip cover will rotate during the clinical case, and the opening of the injection nozzle will face the direction of the observation window. There is a risk that it will come out of the observation window, and it may not be possible to supply air or water to the observation window.

Further, in the construction of Japanese Utility Model Laid-Open No. 53-134591, since the tip cover and the tip component are fixed by fitting by the tip cover made of an elastic material, the tip cover is not fixed sufficiently and is inserted. When the part is inserted into the body,
The tip cover could fall out of the tip component and be left inside the body. Further, since the tip cover is made of an elastic material, there is a problem that slippage is poor and insertability of the insertion part is poor. Further, when the tip cover is made of an elastic material, slippage is bad, and therefore there is a problem that it is difficult to finely adjust the attachment position when the tip cover is attached to the tip component. Therefore, there is a problem in the assembling in which it becomes difficult to direct the opening of the injection nozzle toward the observation window.

The present invention has been made in view of the above circumstances, and it is possible to facilitate the work of correctly orienting the opening portion of the injection nozzle to the observation window during the work of attaching the tip cover to the tip forming portion. It is an object of the present invention to provide an endoscope capable of facilitating the work of attaching a tip to a distal end constituent part.

[0009]

According to the present invention, an observation window is provided on an exposed surface of a tip forming portion, a surface portion of the tip forming portion other than the exposed surface is covered with a tip cover, and at the same time, the tip forming portion of the tip forming portion is covered. In an endoscope provided with an injection nozzle that is connected to a fluid passage formed in the main body and injects a fluid supplied from the fluid passage toward the observation window, the injection of the injection nozzle to the distal end configuration portion. A first nozzle conduit forming part that constitutes a part of the conduit is provided, and the tip cover is fitted into the first nozzle conduit forming part in a concavo-convex manner, and is connected to the first nozzle conduit forming part. A second part which constitutes the remaining part of the injection line of the injection nozzle
Nozzle pipe line forming part is provided.

[0010]

In the above structure, by providing the first nozzle conduit forming part which constitutes a part of the injection conduit of the injection nozzle in the tip forming part, the observation window of the exposed surface of the tip forming part and the injection nozzle It is possible to properly align the direction of the injection conduit with the direction of the injection conduit, and at the time of the work of attaching the tip cover to the tip constituent part, the first nozzle conduit constituent part on the tip constituent part side and the second nozzle conduit part on the tip cover side. By the concave and convex fitting with the component, the direction of the injection pipe of the injection nozzle can be easily directed to the observation window without performing a troublesome positioning work.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
Will be described. FIG. 3 shows a schematic configuration of the entire endoscope 1, and reference numeral 2 denotes an operation unit of the endoscope 1. A proximal end portion of the elongated insertion portion 3 is connected to the front end of the operation portion 2. Further, the base end portion of the universal cord 4 is connected to the side portion of the operation portion 2.

A connector portion 5 connected to a light source device (not shown) is provided at the tip of the universal cord 4. Then, by connecting the connector portion 5 to the light source device, the illumination light is supplied from the light source in the light source device to the incident end face of the light guide 6 arranged in the endoscope 1. The light guide 6 is composed of a fiber bundle, transmits the illumination light supplied from the light source device to the incident end surface, and is fixed to the exposed surface 7a of the tip of the tip forming portion 7 of the insertion portion 3 as shown in FIG. Illumination light is emitted from the other emission end face 9 thus formed to the front side of the subject.

Further, an observation window 8 is arranged at a substantially central portion on the exposed end surface 7a of the distal end forming portion 7, and the emission end surfaces 9 and 9 of the light guide 6 and a treatment tool insertion hole are provided around the observation window 8. The opening 71 of the first suction pipe line 14a, which will be described later, and the injection nozzle 18 are also provided. And
The subject illuminated by the illumination light from the emission end faces 9, 9 of the light guide 6 is focused on its focal plane by the objective lens system 9 disposed behind the observation window 8 of the tip forming section 7 as shown in FIG. An image is formed on the provided solid-state image sensor (hereinafter referred to as SID) 10. The optical image photoelectrically converted by the SID 10 becomes an electric signal, and the electric cable 11
And is led to the electrical contact 12 of the connector section 5.

Next, the conduit system arranged in the endoscope 1 will be described. A first suction conduit 14a for performing suction and a first air supply conduit 15 for supplying air are provided in the insertion portion 3.
a, a first water supply conduit 16a for supplying water is provided.

These air supply line 15a and water supply line 16
The tip side of a merges in the vicinity of the tip of the insertion portion 3 to form a single common fluid conduit 17, and air or water is supplied through an injection nozzle 18 (described later) provided at the tip of the fluid conduit 17. The generated gas or liquid (such as cleaning water) can be sprayed onto the outer surface of the observation window 8.

Further, the rear end sides of the first suction pipe line 14a, the first air supply pipe line 15a and the first water supply pipe line 16a are arranged in the universal cord 4 extended from the operation section 2. The second suction pipe line 14b, the second air supply pipe line 15b, and the second water supply pipe line 16b are respectively connected via a suction switching device 32 and an air / water supply switching device 31, which will be described later.

Further, the connector portion 5 at the tip of the universal cord 4 has a thin tubular air supply mouthpiece 21 and an air supply / water supply mouthpiece 22.
Also, the suction cap 23 is provided so as to project. In this case, the air / water supply mouthpiece 22 is the inner lumen 2 through which the wash water passes in the center.
It has a double cylinder structure having 2a and an outer lumen 22b through which gas passes on the outer peripheral side of the inner lumen 22a. And
The rear end of the second water supply conduit 16b is connected to the central inner lumen 22a of the air supply / water supply mouthpiece 22 and the rear end of the second air supply conduit 15b is connected to the outer lumen 22b of the air supply / water supply mouthpiece 22. Are connected. The rear end side of the second air supply line 15b is branched and is also connected to the air supply mouthpiece 21.

Further, the rear end of the second suction conduit 14b is connected to the suction mouthpiece 23. A suction pump (not shown) and a suction tube communicating with a suction bottle are connected to the suction cap 23.

By connecting the connector part 5 to the light source device, the thin tube-shaped air supply cap 21 projecting from the connector part 5 is connected to an air supply pump (not shown) in the light source device. The air supplied from the air supply pipe 21 is guided to the second air supply conduit 15b side or the outer lumen 22b side of the air supply / water supply base 22 through the air supply mouthpiece 21.

A water supply tank 26 is connected to the air / water supply mouthpiece 22 via a connecting tool 25.
The connecting tool 25 includes an inner lumen 22a of the air / water supply mouthpiece 22.
An upper end of a water supply tube 27 connected to the above and an upper end of an air supply tube 28 connected to the outer lumen 22b are provided. In this case, the lower end of the water supply tube 27 extends to a portion near the inner bottom of the water supply tank 26 and is immersed in the wash water in the water supply tank 26. Further, the lower end of the air supply tube 28 is fixed to the upper part in the water supply tank 26. Then, the air / water supply mouthpiece 22 is the connection tool 25.
The air in the water supply tank 26 is pressurized by supplying air into the water supply tank 26 via the air supply tube 28.

Further, the operation unit 2 includes an air / water switching device 31.
A flow path switching unit in which the suction switching device 32 and the suction switching device 32 are integrated is detachably provided. In this case, the air / water switching device 31 includes the first air supply conduit 15a and the second air supply conduit 15b.
Between the first water supply line 16a and the second water supply line 1
It is provided in the connection part between 6b. By operating the air / water supply switching device 31, the air supply / water supply operation can be switched.

Further, the suction switching device 32 is provided at the connecting portion between the first suction pipe line 14a and the second suction pipe line 14b, and the suction switching device 32 can switch the suction. It is like this.

FIG. 4 shows the construction of the air / water switching device 31 and the suction switching device 32. In FIG. 4, 34 is an exterior of the operation unit 2. The exterior 34 has a second air supply line 15b on the side of the universal cord 4 and a first air pipe 15 on the side of the insertion portion 3
Caps 35 and 36 connected to the air supply pipe line 15a, the second water supply pipe line 16b on the universal cord 4 side, and the cap 3 connected to the first water supply pipe line 16a on the insertion section 3 side.
Further, caps 39 and 40 connected to the second suction conduit 14b on the side of the universal cord 4 and the first suction conduit 14a on the side of the insertion portion 3 are respectively screwed. An O-ring 41 is attached to each of the bases 35, 36, 37, 38, 39, 40.

Reference numeral 42 is a cylinder. The cylinder 42 is fitted with fitting portions 43, 44, 45, 46, 47, 4 which fit into the bases 35, 36, 37, 38, 39, 40, respectively.
8 are provided.

Further, in the cylinder 42, a water supply introducing pipe line 51 is formed which connects the upper part of the fitting part 45 and the upper part of the fitting part 46. In this case, an air / water feeding piston 49 is provided above the fitting portion 45 so as to be vertically movable in FIG. At the lower end of the air / water feeding piston 49, a water feeding switching valve 50 for opening / closing the upper opening of the fitting portion 45 is screwed. It should be noted that an unnecessary hole 52 is formed in the cylinder 42 due to the processing of the water supply introduction pipe line 51, but this hole 52 is closed with a filler in order to prevent deterioration of the water supply response.

Further, the air / water feeding piston 49 is provided with a leak hole 53 which communicates between an upper surface opening portion of the piston 49 and a communication port 54 formed on the peripheral surface of the piston 49. The leak hole 53 is connected to the communication port 54.
Through the first air supply introducing conduit 55 formed in the cylinder 42, and further through the fitting portion 43 and the cap 35, communicating with the second air supplying conduit 56b on the universal cord 3 side. ..

Further, the air / water feeding piston 49 and the cylinder 4
A coil spring 57 for constantly urging the air / water feeding piston 49 in the upward direction is provided between the coil spring 57 and the No. 2. Further, the air / water feeding switching button 5 formed integrally with the air / water feeding piston 49 is integrally formed with the cover 58 fitted and fixed to the cylinder 42.
9 is provided.

The cylinder 42 and the cover 58 are firmly fixed to each other to ensure an airtight state. In this case, cover 5
A mounting groove 69 is provided at a lower end portion of the mounting portion 8 so as to be detachably mounted on a mounting portion 68 projecting from the outer casing 32 of the operation portion 2.

A check valve 61 is provided on the side of the air / water switch button 59, which is provided above the second air introduction conduit 60 communicating with the fitting portion 44 of the cylinder 42. .. A mist injection water switching button 6 is provided above the check valve 61.
Two are provided.

Further, a suction piston 63 is fitted in the mouthpiece 39 so as to be movable up and down. This suction piston 63
Has an upper portion extending to the outside of the cylinder 42, and a suction button 64 is screwed to the upper end of the outside extending portion.

Further, the suction piston 63 has a communication hole 65 for communicating between a peripheral surface opening formed on the outer peripheral surface of the external extension and a lower surface opening formed on the lower surface of the suction piston 63. Is provided. Furthermore, the suction piston 6
A coil spring 66 for constantly biasing the suction piston 63 in the upward direction is provided between the cylinder 3 and the cylinder 42.
Then, in a normal state in which the suction piston 63 is not pushed, the spring force of the coil spring 66 holds the peripheral surface opening of the communication hole 65 of the suction piston 63 in a state of being communicated with the outside air. .. Therefore, in this state, the second suction pipeline 14b is held in a state of being communicated with the outside air through the communication hole 65 of the suction piston 63, and between the first suction pipeline 14a and the second suction pipeline 14b. Is to be held in the cutoff state.

Further, the cylinder 42 is provided with a suction introduction conduit 67 for connecting the fitting portion 48 and the space above the mouthpiece 39 in the cylinder 42. When the suction button 64 is pushed in, the peripheral surface opening of the communication hole 65 of the suction piston 63 is switched to a state in which it is in communication with the space above the mouthpiece 39 in the cylinder 42, and in this state, the first suction conduit 14a and second suction line 14
It is designed to communicate with b.

The air / water switch button 31 of the air / water switch device 31 is held in a normal position where it is not pushed, and the leak hole 53 of the air / water switch button 59 is open. The air sent from the pump built in the light source device passes through the second air supply pipe line 15b on the side of the universal cord 4 and further passes through the base 35, the first air supply introduction pipe line 55, and the communication port 54. , Leaks to the atmosphere through the leak hole 53. In this case, the water supply switching valve 50 is held in a state of closing the upper surface opening of the fitting portion 45. Therefore, universal code 4
The second water supply conduit 16b on the side and the first water supply conduit 16a on the side of the insertion part 3 are held in a blocked state.

The air feeding operation of the endoscope 1 is performed by closing the leak hole 35 of the air / water feeding switching button 59 with fingers. That is, when the leak hole 35 of the air / water switch button 59 is blocked by a finger, the pump built in the light source device (not shown) passes through the second air supply conduit 15b on the side of the universal cord 4 and the mouthpiece 35. The check valve 61 is pushed up by the pressure of the air supplied into the first air supply / introduction line 55. Therefore, the air in the first air supply introducing pipe line 55 flows into the second air supply introducing pipe line 60 side, and subsequently through the mouthpiece 36, the first air supply pipe line 15a on the insertion portion 3 side, and the like. Air is sent from the jet nozzle 18 at the tip.

Further, the spray water supply operation of the endoscope 1 is performed by pressing the air supply / water supply switching button 59. That is, when the air / water switch button 59 is pressed, the water switch valve 50 is operated to move downward in FIG. 4, and the upper opening of the fitting portion 45 is opened. In this case, the second water supply conduit 16b on the side of the universal cord 4 and the first water supply conduit 16a on the side of the insertion portion 3 are held in communication with each other. Therefore, the cleaning water sent from the water supply tank 26 via the second water supply conduit 16b on the side of the universal cord 4 is the mouthpiece 37, the water supply introduction conduit 51, the mouthpiece 38, and the first water supply conduit 16a on the insertion portion 3 side. Through the fluid conduit 17 side,
In the fluid conduit 17, the water is sprayed from the injection nozzle 18 while being mixed with the air sent through the water conduits 16b and 16a.

The water supply operation of the endoscope 1 is performed by pressing the spray water supply switching button 62. That is, when the spray water switching button 62 is pushed in, the check valve 61 is crushed. Therefore, in this state, the connection between the second water supply conduit 16b on the side of the universal cord 4 and the first water supply conduit 16a on the side of the insertion portion 3 is switched to the cutoff state, and air is not supplied. By pushing 59, only water is supplied.

Further, the suction operation of the endoscope 1 is performed by pushing the suction button 64. in this case,
When the suction button 64 is not pushed in, the pressure of a suction pump (not shown) leaks to the atmosphere via the second suction pipe line 14b on the side of the universal cord 4 and the base 39 and the communication port 65. Then, when the suction button 64 is pushed in this state, the communication hole 65 of the suction piston 63 is
The peripheral opening is switched to a state in which it communicates with the space above the mouthpiece 39 in the cylinder 42, and in this state, the first suction conduit 14a and the second suction conduit 14b communicate with each other. .. Therefore, in this state, the first portion on the insertion portion 3 side is
The suction operation is performed via the suction pipe line 14a.

On the other hand, as shown in FIG. 2, the tip forming portion 7 has a ring-shaped tip cover mounting groove 72 formed on the outer peripheral surface of the tip portion. Then, the tip cover mounting groove 72
A substantially cylindrical tip cover 73 that covers the surface portion of the tip forming portion 7 other than the tip exposed surface 7a is attached.

An annular convex portion 73a is formed on the inner peripheral surface of the cylindrical portion of the tip cover 73. In this case, the tip component 7
An annular recess 74 into which the annular projection 73a is fitted is formed on the outer peripheral surface of the. The tip cover 73 is detachably fitted and fixed to the tip component 7.

Further, a substantially U-shaped convex portion (first nozzle pipe line forming portion) 75 forming a part of the injection pipe line of the injection nozzle 18 is projectingly provided on the front end exposed surface 7a of the tip forming unit 7. Has been done. In this case, the U-shaped opening of the convex portion 75 is arranged so as to face the observation window 8.

Further, the tip end of the tip cover 73 is extended toward the observation window 8 so as to cover the opening of the fluid conduit 17 formed on the tip exposed surface 7a of the tip forming portion 7. The part 76 is formed. On the joint surface side of the extension portion 76 with the tip exposed surface 7a of the tip forming portion 7, as shown in FIG. 5, a convex portion 75 is fitted in a concavo-convex shape, and the protruding portion 75 is connected to the ejection pipe of the ejection nozzle 18. A recessed portion (second nozzle pipe passage forming portion) 77 forming the remaining portion of the passage is formed.

The concave portion 77 is formed as a concave portion which is slightly larger than the outer shape of the convex portion 75 and has a substantially similar shape so as to fit into the U-shaped convex portion 75 on the tip forming portion 7 side. Then, the base end portion of the injection pipe line in the injection nozzle 18 formed by the concave-convex fitting of the concave portion 77 of the extending portion 76 of the distal end cover 73 and the U-shaped convex portion 75 on the distal end forming portion 7 side is The injection port on the front end side of the injection conduit is connected to the opening of the fluid conduit 17 formed on the exposed end surface 7a, and the observation window 8 is provided.
It is placed facing the direction.

In view of the above, in the above-described structure, since the tip forming portion 7 is provided with the substantially U-shaped convex portion 75 forming a part of the injection pipe of the injection nozzle 18, the tip forming portion 7 is exposed. The observation window 8 of the surface 7a and the direction of the injection pipe line of the injection nozzle 18 can be correctly aligned. Therefore, at the time of attaching the tip cover 73 to the tip component 7, the projection nozzle 75 on the tip component 7 side and the recess 77 on the tip cover 73 side are fitted in a concavo-convex shape so as not to perform a troublesome positioning operation. Since the direction of the injection pipes 18 can be easily oriented to the observation window 8, the tip cover 7 is attached to the tip forming portion 7.
It is possible to facilitate the work of correctly orienting the opening of the injection nozzle 18 in the direction of the observation window 8 during the work of fixing the nozzle 3, and to facilitate the work of attaching the tip cover 73 to the tip forming portion 7. be able to.

Further, since the convex portion 75 provided on the exposed surface 7a of the tip forming portion 7 can be used as a guide when the concave portion 77 on the tip cover 73 side is directed toward the observation window 8 side, for example, the tip cover 73 At the time of replacement, it is possible to automatically set the direction of the opening of the injection nozzle 18 in the direction of the observation window 8 simply by attaching the tip cover 73 to the tip forming section 7, which is extremely easy to handle. Therefore, the insertion portion 3 of the endoscope 1
When the gas is introduced into the body cavity, or when the body cavity is pressurized by the air supply operation, filth enters the opening of the injection nozzle 18 and the opening of the injection nozzle 18 increases as clinical cases are piled up. When the portion is clogged, the tip cover 73 is removed from the tip forming portion 7, the opening of the injection nozzle 18 is washed, and then the work of reattaching the tip cover 73 to the tip forming portion 7 is performed more easily than before. be able to.

Further, since the convex portion 75 provided on the exposed end surface 7a of the distal end forming portion 7 constitutes a part of the injection conduit of the injection nozzle 18, the air flowing out from the opening of the fluid conduit 17 or It can be used as a guide for guiding water to the observation window 8 and can reliably send air or water to the observation window 8.

When the tip cover 73 is fixed to the tip forming portion 7 with an adhesive, the convex portion 75 provided on the tip exposed surface 7a of the tip forming portion 7 communicates with the opening of the fluid conduit 17. It is possible to prevent the adhesive from flowing into the injection pipe line of the injection nozzle 18 that operates.

Further, a flow path switching unit in which the air / water / water switching device 31 and the suction switching device 32 are integrated is detachably provided in the operation portion 2, and all the pipe lines provided in the endoscope 1 are operated respectively. Since the opening is provided outside the portion 2, it is possible to facilitate the flow of the cleaning liquid into each conduit during the cleaning work of the endoscope 1, and it is possible to improve the work efficiency of the cleaning work.

6 to 8 show a second embodiment of the present invention. This is substantially U which constitutes a part of the injection pipe line of the injection nozzle 18 at the extending portion 76 of the tip cover 73.
A concave portion 81 having a character shape is formed, and a convex portion 83 is projected on a joint surface of the extending portion 76 of the tip cover 73 around the concave portion 81 and the tip exposed surface 7a on the tip forming portion 7 side. A concave portion 82 into which the convex portion 83 is fitted is provided on the exposed front end surface 7a of the constituent portion 7.

Therefore, in this case, the tip cover 73
Convex portion 83 and concave portion 82 of the tip exposed surface 7a of the tip forming portion 7
Since the injection port of the injection nozzle 18 of the tip cover 73 can be directed to the observation window 8 by the concave-convex fitting with, the same effect as that of the first embodiment can be obtained.

Although the direct-viewing endoscope has been described in each of the above-described embodiments, as shown in FIG. 9, in the side-viewing endoscope, the injection nozzle 18 is provided on the side wall surface 91a of the distal end forming portion 91 of the insertion portion 3. It can also be applied to the case of forming. In this case, a substantially cylindrical tip cover 92 is mounted in the tip cover mounting groove on the outer peripheral surface of the tip forming section 91 to cover the surface portion of the tip forming section 91 other than the side wall exposed surface 91a.

An annular convex portion 92a is formed on the inner peripheral surface of the cylindrical portion of the tip cover 92. In this case, the tip forming unit 9
On the outer peripheral surface of 1, there is formed an annular concave portion 93 into which the annular convex portion 92a is fitted. And this tip cover 92
Is detachably fitted and fixed to the tip forming portion 91.

Further, on the outer peripheral surface of the tip forming portion 91, a pair of guide convex portions 91b, which constitute a part of the injection pipe of the injection nozzle 18 and are arranged in parallel and opposed to each other, are formed.
In this case, the openings on the tip ends of the pair of guide protrusions are arranged so as to face the observation window 8.

Further, an extension portion 94 extending toward the observation window 8 is formed at the tip of the tip cover 92. As shown in FIG. 9, the extending portion 94 is fitted with a pair of guide protrusions 91b of the tip forming portion 91 on the joint surface side of the tip forming portion 91 with the side wall exposed surface 91a to form a pair of guide protrusions. A recessed portion (second nozzle conduit forming portion) 95 that is connected to 91b and forms the remaining part of the injection conduit of the injection nozzle 18 is formed. Therefore, also in this case, the same effect as that of each of the above-described embodiments can be obtained.

Further, as shown in FIG. 10, a forceps raising base 98 is provided between the tip cover 92 connected to the tip side of the tip forming portion 91 and the main body of the tip forming portion 91 in the side view endoscope. A forceps raising base storage portion 97 for storing is formed.

One end of the forceps raising base 98 has a tip forming portion 9
It is rotatably attached to a rotary shaft 99 which is fixed to the main body 1. Further, the forceps raising base 98 is adapted to be rotated by a forward / backward operation of a raising wire (not shown). In this case, the wall surface 100 of the forceps raising base accommodating portion 97, which is arranged so as to face the tip side of the forceps raising base 98, follows the arc of the rotation trajectory of the tip surface 101 of the forceps raising base 98 around the rotation axis 99. It is formed by a curved surface.

Therefore, in the above-mentioned structure, the forceps raising base storage portion 9 is arranged to face the tip side of the forceps raising base 98.
7, the forceps raising base 98 with the rotation axis 99 as the center.
Since it is formed by a curved surface along the arc of the rotation trajectory of the tip surface 101 of the, the gap between the tip surface 101 of the forceps raising base 98 and the wall surface 100 of the forceps raising base storage portion 97 on the tip cover 92 side should be made small. You can Therefore, for example, the endoscope 1
When a treatment for crushing gallstones is performed using a crushing tool such as an electro-hydraulic impact crushing stone tool (hereinafter referred to as EHL) inserted through a forceps channel of a forceps raising table 98 and a tip cover. 92 side forceps raising base storage section 9
It is possible to prevent the gallstone fragments excreted up to the duodenum from entering the gap between the wall surface 100 of 7 and the forceps raising base 98.
Can be prevented from malfunctioning.

Further, as shown in FIG. 11, the forceps raising base 98
One end of a sliding member 111 made of an elastic member is fixed to the lower end side of the forceps, and the other end of the sliding member 111 is pressed against the wall surface 112 of the forceps raising base accommodating portion 97 on the tip cover 92 side to forceps raising. A configuration may be employed in which a gallstone fragment is prevented from entering the gap between the forceps raising base 98 and the wall surface 112 of the forceps raising base housing portion 97 on the tip cover 92 side when the upper base 98 is raised.

The present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0059]

As described above, according to the present invention,
The first nozzle pipe forming part that constitutes a part of the injection pipe of the injection nozzle is provided in the tip forming part, and the tip cover is fitted into the first nozzle pipe forming part in a concavo-convex manner. Since the second nozzle conduit forming portion that is connected to the passage forming portion and constitutes the remaining portion of the injection conduit of the injection nozzle is provided, the opening of the injection nozzle is observed when the tip cover is attached to the tip forming portion. It is possible to facilitate the work of correctly pointing the window, and facilitate the work of attaching the tip cover to the tip component.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a main part of a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a distal end constituent portion of the endoscope.

FIG. 3 is a schematic configuration diagram of the entire endoscope.

FIG. 4 is a vertical cross-sectional view showing an air / water supply switching device and a suction switching device.

FIG. 5 is a longitudinal cross-sectional view of a main part showing a joint portion between a first nozzle conduit structure part and a second nozzle conduit structure part.

FIG. 6 is a front view showing a schematic configuration of a main part of a second embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view of the tip forming portion of the embodiment.

FIG. 8 is a longitudinal cross-sectional view of a main part showing a joint portion between the first nozzle pipe line forming portion and the second nozzle pipe line forming portion of the embodiment.

FIG. 9 is a front view showing a schematic configuration of a main part of a third embodiment of the present invention.

FIG. 10 is a vertical cross-sectional view of the tip forming portion of the embodiment.

FIG. 11 is a vertical cross-sectional view showing a modified example of the same embodiment.

[Explanation of symbols]

7, 91 ... Tip configuration part, 7a, 91a ... Tip exposed surface, 8
... Observation window, 17 ... Fluid conduit, 18 ... Injection nozzle, 73 ...
Tip cover, 75 ... Convex part (first nozzle pipe path forming part),
77, 95 ... Recessed portion (second nozzle conduit structure portion), 91
b ... Guide convex portion (first nozzle pipe path forming portion).

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[Procedure amendment]

[Submission date] July 24, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

The cylinder 42 and the cover 58 are firmly fixed to each other to ensure an airtight state. In this case, cover 5
A mounting groove 69 is provided at a lower end portion of the mounting portion 8 so as to be detachably mounted on a mounting portion 68 projecting from the exterior 34 of the operation portion 2.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction content]

The air feeding operation of the endoscope 1 is performed by closing the leak hole 53 of the air / water feeding switching button 59 with fingers. That is, when the leak hole 53 of the air / water switch button 59 is blocked by a finger, a pump incorporated in a light source device (not shown) passes through the second air supply conduit 15b on the side of the universal cord 4 and the mouthpiece 35. The check valve 61 is pushed up by the pressure of the air supplied into the first air supply / introduction line 55. Therefore, the air in the first air supply introducing pipe line 55 flows into the second air supply introducing pipe line 60 side, and subsequently through the mouthpiece 36, the first air supply pipe line 15a on the insertion portion 3 side, and the like. Air is sent from the jet nozzle 18 at the tip.

Front page continuation (72) Inventor Yoshihiro Iida 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. An observation window is provided on an exposed surface of the tip forming section, a surface portion of the tip forming section other than the exposed surface is covered with a tip cover, and a fluid formed in the body of the tip forming section. An endoscope provided with an injection nozzle connected to a passage for ejecting a fluid supplied from the fluid passage toward the observation window, wherein a part of an injection conduit of the injection nozzle is formed in the distal end configuration portion. First to do
Nozzle conduit forming part is provided, and the tip cover is fitted into the first nozzle conduit forming part in a concavo-convex manner.
An endoscope characterized in that it is provided with a second nozzle conduit forming part which is connected to the nozzle conduit forming part of the above and constitutes the remaining part of the injection conduit of the injection nozzle.