JP2001000389A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frontal water feed function to ensure an excellent vision in an endoscope different in the visional direction and the direction of a tip side aperture of a endo-therapy accessory insert channel. SOLUTION: This endoscope provided with a endo-therapy accessory raising base 47 at an aperture communicating with the tip side of a channel 45 for inserting the accessory, is provided with a water feeding tube 51 provided at an insert section, and a water feeding hole 52 provided at the accessory raising base 47, communicating with the water feeding tube 51 and having a tip opening. The direction of a water feeding port 53 of the water feeding hole 52 is changed by making the accessory raising base 47 movable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope provided with a treatment instrument raising table for changing the direction of projection of a treatment instrument guided into a body cavity through a treatment instrument insertion channel formed in an insertion portion.

[0002]

2. Description of the Related Art In a conventional endoscope, a so-called direct-view type endoscope in which an observation field of view coincides with an axial direction of an insertion portion of the endoscope is used. Since the treatment instrument insertion channel for performing an endoscopic treatment is open toward the front of the field of view, water is supplied in the visual field direction through the treatment instrument insertion channel to remove dirt in the field of view. In addition, a method of washing out blood bleeding at the time of performing a treatment, or a method of spraying a dye such as indigo carmine to make the surface of the inner surface of the body cavity at the time of observation stand out and easily find a lesion are possible.

However, these techniques cannot be performed when treatment forceps or the like are inserted into the treatment instrument insertion channel. In such a case, a channel dedicated to water supply should be provided separately, and a channel for treatment instrument insertion should be provided.
By providing one, the problem can be solved.

On the other hand, in a so-called side-view or oblique-type endoscope in which the viewing field direction is set at an angle with respect to the axial direction of the endoscope insertion portion, the above-described measures are taken. Can not. This is because, in an endoscope of a side view or a perspective type, the distal end opening of the treatment instrument insertion channel for inserting the treatment instrument is long and wide in front and back, and is open. Even if water is supplied through the treatment instrument insertion channel, the water supply direction is greatly widened in the forward direction, and the water supply direction becomes scattered, and directivity sufficient for the purpose of water supply cannot be obtained. Further, in a so-called side-view or perspective type endoscope, even if water is supplied through the treatment tool insertion channel, the direction of the distal end opening of the treatment tool insertion channel relative to the direction of the visual field is different from that of the endoscope insertion portion. Since it was substantially oriented in the axial direction, it was not possible to sufficiently supply water in the direction of view.

[0005] In a so-called side-view or perspective-type endoscope, water is supplied in the direction of the field of view.
It is not surprising that there is a method of inserting a water supply tube or the like into the treatment instrument insertion channel and sending water through this tube, but it is not possible to insert a water supply tube or the like with the forceps inserted. However, in that case, water cannot be sent.

[0006] In addition, in the case of a so-called side-view or oblique-type endoscope, if a function of not only water supply but also air supply and suction is provided in order to secure a visual field, the operation of observation and treatment can be further improved. Although it is thought to improve, they have not been used for the same reasons as described above.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a forward water supply function in an endoscope in which the direction of the visual field is different from the direction of the opening on the distal end side of the treatment instrument insertion channel, and to secure a good visual field.

[0008]

According to the first aspect of the present invention, there is provided a treatment tool insertion channel formed in an insertion portion, through which a treatment tool is inserted, and an opening at a distal end portion of the insertion portion. An opening communicating with the distal end side of the tool insertion channel, and provided in this opening to be movable,
In an endoscope provided with a treatment instrument raising base for changing a direction in which a treatment instrument guided through the treatment instrument insertion channel protrudes from the opening, a first device provided in the insertion section
And a second conduit provided on the treatment instrument raising table and communicating with the first conduit and having a distal end opening, by moving the treatment instrument raising table. The direction of the opening of the second conduit end is changed.

According to a second aspect of the present invention, the first and second conduits are formed by a single continuous tube. It is an endoscope.

[0010] In the endoscope of the present invention, by changing the raising angle of the treatment instrument raising table, the direction of water supply or the like changes accordingly. Further, even when the treatment tool is used, it is possible to substantially follow the direction in which the treatment tool is protruded, and to perform water supply or the like to the front of the protrusion. With such a function, a good visual field is ensured, and the operability of the treatment is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An electronic endoscope system according to a first embodiment of the present invention will be described with reference to FIGS.

An electronic endoscope system will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes an electronic endoscope. The electronic endoscope 1 includes an elongated insertion portion 2 inserted into an observation target site such as a body cavity, an operation portion 3 connected to a base end portion of the insertion portion 2 and having a holding portion. The universal cord 4 is extended from a side surface and includes a signal cable, a light guide, and the like, and a connector portion 5 provided at an extending end of the universal cord 4. The electronic endoscope 1 is detachably connected to an external light source device 6 through the connector section 5 and is also detachably connected to a video processor 7. A monitor 8 is connected to the video processor 7 so as to display an observation image on the monitor 8. A VTR deck, a video printer, a video disk, an image file recording device, and the like (not shown) can be connected to the video processor 7.

The insertion section 2 of the electronic endoscope 1 has a tip section 12 of a side view type having a built-in image pickup section, which will be described later, a bending section 13 that can be bent to a desired angle, and flexibility. And a flexible tube portion 14 having the same.

The operation unit 3 of the electronic endoscope 1 includes a remote switch 15 for instructing operation such as freeze and release of an observation image, and an air / water supply button 16 for performing an air / water supply operation.
, A suction button 17 for performing a suction operation, and a bending operation knob 18 for performing a bending operation of the bending portion 13 are provided.

A light guide end 19 connected to the light source device 6 is provided at the connector 5 so as to protrude from the tip. An electrical connection connector 20 is provided on the side of the connector 5.
Is provided. Further, a pressure pipe base 21, a water supply pipe base 22, and a suction pipe base 23 are provided on the side of the connector section 5, and these are connected to corresponding fluid control devices and suction devices (not shown). The connection cable 24 connected to the video processor 7 is connected to the electrical connection connector 20.

The distal end portion 12 of the electronic endoscope 1 is configured as shown in FIGS. The base of the distal end portion 12 has a structure in which a distal end main body 31 formed of, for example, stainless steel made of metal is covered with a distal end cover 32 formed of resin or the like except for a part of the upper surface. Tip body 31
On the upper surface portion, a side view type observation window 33 for observing the inside of a body having a function of observing a direction perpendicular to the axial direction of the insertion section 2 and an illumination window for sending light to the observation field of view are provided. 34 are provided. The observation window 33 and the illumination window 34 are arranged back and forth along the axial direction of the insertion section 2. As shown in FIG. 2 and FIG. 3, the observation window 33 is arranged on the near side, and the illumination window 34 is arranged on the distal end side. A treatment instrument raising chamber 35 that communicates with a forceps channel, which will be described later, is formed on the side of the observation window 33 and the illumination window 34 so as to be long before and after in the axial direction of the insertion section 2. The treatment instrument raising chamber 35 forms an opening of the forceps channel. In addition, a nozzle 36 for air / water supply for removing dirt attached to the outer surface of the observation window 33 is attached.

As shown in FIG. 3, a prism 37 for changing the direction of the optical image incident from the observation window 33 is provided inside the observation window 33, and the optical image incident through the prism 37 is converted into an electric signal. An image pickup device 38 for converting the image data into an image is provided. The illumination window 34 is constituted by an illumination lens, and a light guide 39 for transmitting illumination light to the illumination window 34 is installed inside the illumination window 34. An air / water channel 41 is connected to the rear end of the nozzle 36 via an air / water pipe 42.

Further, as shown in FIG.
At least a part of 2 is provided with a transparent portion 43, and through this transparent portion, the tip 12 can be checked from outside for dirt. Here, in particular, the treatment instrument raising chamber 3
5 is configured to be able to see through to see the situation inside. Therefore, when the endoscope 1 is cleaned, it can be easily confirmed whether or not the dirt has really been removed.

As shown in FIG. 4 to FIG.
A channel pipe 46 for connecting a distal end of a tube forming a treatment tool insertion channel 45 for passing a treatment tool such as forceps for performing an endoscopic treatment is connected by soldering or bonding. The treatment tool insertion channel 45 is formed so as to communicate with the treatment tool raising chamber 35, and the treatment tool raising chamber 35 is connected to the treatment tool insertion channel 4.
5 constitute the opening on the tip side.

At the front part in the treatment instrument raising chamber 35,
A treatment tool raising table 47 for changing the protruding direction of the treatment tool inserted through the channel 45 is provided on an extension of the channel pipe 46. The treatment instrument raising table 47 has its proximal end portion pivotally attached to the distal end main body 31 by a pin or the like (not shown), and is attached so that the distal end portion can be raised and lowered.

A distal end of a raising wire 48 is connected to a distal end of the treatment instrument raising table 47.
Is guided through a raising wire insertion conduit 49 provided in the insertion section 2 to a traction operation mechanism (not shown) provided in the operation section 3. Then, by moving the towing operation mechanism with the raising lever 50 provided on the operation section 3, the raising wire 48 can be appropriately pulled to raise and lower the treatment instrument raising table 47.

On the other hand, as shown in FIGS. 4 to 6, the insertion portion 2 of the electronic endoscope 1 is located below the channel pipe 46 and the treatment tool insertion channel 45, and is flexible. A water supply tube (first conduit) 51 for performing a certain water supply / liquid supply passes therethrough, and a distal end of the water supply tube 51 is provided with a water supply hole (second conduit) provided in the treatment instrument raising table 47. 52 is connected to one end.

A water supply hole 52 provided in the treatment instrument raising table 47
(The opposite side to which the water supply tube 51 is attached)
The direction of the water supply port 53 formed by the distal end opening is provided substantially in parallel with the guide surface 54 of the treatment instrument raising table 47 with which the treatment instrument contacts. Therefore, the direction of water supply when water is supplied from the water supply port 53 provided on the treatment tool raising table 47 is determined by the rising angle of the treatment tool raising table 47, and the treatment tool is protruded by changing the rising angle. The water is sent forward almost following the direction. With this function, a good visual field can be ensured, and the operability of the treatment can be improved.

The connecting portion of the treatment tool raising table 47 to which the water supply tube 51 is attached is connected to the treatment tool raising table 4.
An escape portion 55 cut in accordance with the size of the water supply tube 51 is formed so that the water supply tube 51 does not buckle when the 7 is raised.

The water supply tube 51 passes through the insertion section 2 and is connected to a water supply base 56 provided on the operation section 3. A water supply / liquid supply can be performed by attaching a syringe or the like to the water supply base 56. It is something.

FIGS. 5 and 6 show a modification of the treatment tool raising table 47, the water supply tube 51, and the water supply port 53 shown in FIG. In the example shown in FIG. 5, the water supply tube 51 is connected to the distal end main body 31.
The water supply hole 52 provided in the distal end main body 31 and the treatment instrument raising table 47 is attached to the water supply pipe 57 attached to the
Are connected by a flexible second water supply tube (connection tube) 58.

In the embodiment shown in FIG. 6, a groove-shaped water supply tube opening 5 opened downward in the treatment instrument raising table 47 is provided.
9 are provided. The cross-sectional shape of the water supply tube opening 59 has a shape as shown in FIG. 7, and the distal end of a single water supply tube 51 is integrated into the opening 59 from below the treatment instrument raising table 47. The part is fitted and mounted. Then, the water supply hole 52 and the water supply port 53 are formed by the distal end portion of the water supply tube 51. It should be noted that the water supply tube 51 is an integral single tube, and is connected to the first conduit and the second conduit.
Is formed continuously, but it may be an integral one connecting a plurality of tube portions.

According to the embodiment described above, the treatment instrument raising table 47 is provided with the water supply hole 52, and the treatment tool raising table 47 is connected to the water supply tube 51 so that water can be supplied. It is possible to feed water in the direction in which it projects, and it is possible to remove dirt and the like in the viewing direction.

Since the treatment instrument raising table 47 has a water supply function, water can be supplied forward without passing a water supply tube or the like through the treatment instrument insertion channel 45.
Water can be fed forward even when the treatment tool is inserted.

Since the water supply hole 52 is provided in the treatment tool raising table 47, the direction of water supply can be changed by operating the treatment tool raising table 47, so that water can be supplied over a wide area while the visual field is fixed. it can.

The water supply tube 51 is attached to the water supply pipe 57 attached to the distal end main body 31, and the water supply hole 52 provided in the treatment instrument raising table 47 and the distal end main body 31 are connected by the second water supply tube 58. When clogging occurs in the water supply conduit at the distal end portion 12, the treatment instrument raising table 47, the second
It is only necessary to replace the water supply tube 58, and the repairability is improved.

The treatment tool raising table 47 is provided not only with the water supply hole 52 but also with a water supply tube opening 59 so as to provide a water supply tube 5.
Since the water supply tube 51 can be attached to the distal end of the treatment instrument raising table 47 by attaching the distal end portion of the first part, the seam between the water supply tube 51 and the water supply hole 52 is eliminated, and the cleaning performance is improved.

Since the water supply tube 31 is attached from below the treatment tool raising table 47, the water supply tube 3
There is no need to align the 1 with the water supply hole and fix it by bonding or the like, so that the assemblability and repairability are improved.

The effects described above are not limited to the water supply for removing dirt in the body cavity, but also to the case where the dye is sprayed for improving the observability in the body cavity or the case where the bleeding occurs during the treatment. Similar effects can be obtained when the agent is sprayed.

In this embodiment, the side-view type endoscope is shown. However, the same effect can be obtained with a perspective-type or direct-view type endoscope having a treatment instrument raising mechanism. .

(Second Embodiment) An electronic endoscope according to a second embodiment of the present invention will be described with reference to FIGS. The configuration according to the present invention may be the same as that of the first embodiment.

The distal end portion 12 of the electronic endoscope according to the present embodiment is provided with a side-view type distal end adapter 61 having a viewing direction perpendicular to the axis of the endoscope insertion portion. It is designed to be detachably attached to the part.

The distal end portion of the insertion section 2 is constituted by a distal end body 62 made of a substantially cylindrical metal or the like.
An imaging device 63 that converts an optical image incident through the distal end adapter 61 into an electric signal is provided on the distal end body 62.
A light guide 64 for sending illumination light into the body cavity,
A treatment tool insertion channel 45 serving as an insertion passage for a treatment tool and the like.
In addition, an elevating wire insertion pipe 66 serving as an insertion passage of the elevating wire 48 for elevating the treatment instrument erecting table 47 is provided. The front part of the imaging device 63 is an entrance window 67.
The front portion of the light guide 64 is an emission window 68, which is provided flush with the distal end surface of the distal end main body 62. The distal end face of the distal end portion main body 62 is also flush with the distal end 65 of the air supply / water supply channel 41 and the treatment instrument insertion channel 45 serving as a treatment instrument insertion passage.

The tip adapter 61 has a structure in which a tip adapter body 71 made of a substantially cylindrical metal member and a tip cover 72 made of a material such as resin are integrally assembled. An observation unit 73 including a prism for changing the viewing direction in the tip adapter body 71;
An illumination unit 76 including an illumination lens 74 for illumination of the body cavity and a distal light guide 75; a treatment instrument insertion hole 77 for inserting a treatment instrument and the like inserted through the treatment instrument insertion channel 45; A treatment tool raising table 47 similar to the above is provided for changing the direction of projection of the treatment tool inserted through the tool insertion hole 77.

Further, a raising wire 48 for raising the treatment tool raising table 47 is connected to the treatment tool raising table 47.
1 through the raising wire insertion conduit 78 formed in the endoscope insertion portion and the raising wire insertion conduit 66 provided in the endoscope insertion portion. It can be pulled by operating the upper lever 50. Then, by the pulling operation of the raising wire 48,
The treatment instrument raising table 47 can be freely raised to change the projecting direction of the treatment instrument.

The distal end adapter 61 and the distal end main body 62 described above are connected in a state where the positions of the respective channels and the like are matched. For this reason, the distal end adapter 61 and the distal end portion main body 62 have connection screw portions 79a, 7 for connection.
9b are provided and connected by tightening (FIG. 9
And FIG. 10).

(Third Embodiment) An electronic endoscope according to a third embodiment of the present invention will be described with reference to FIGS. The configuration according to the present invention may be the same as that of the first embodiment.

In the endoscope according to this embodiment, the bending portion 13 of the insertion section 2 is configured as follows. As shown in FIG. 11, the bending portion 13 of the endoscope includes a plurality of bending pieces 81 rotatably connected to each other.
1 is connected so as to be adjacent to the front and rear thereof by a pin 82, and is configured to be able to bend as a whole. In this case, the pin 82 is attached so as not to come off by caulking or the like. A blade 83 woven in a tubular shape with metal fibers is put on the curved pieces 81 connected to each other, and a water-tight curved rubber 84 is put on the blade 83. The distal end of the flexible tube portion 14 is attached to the rear end of the curved portion 13.

Of the bending pieces 81 forming the bending portion 13, the bending piece (first bending piece) 81 located at the most distal end.
a is a bending wire 8 for bending operation in the vertical and horizontal directions;
5 (only the upward wire is shown here)
Is connected. The bending wire 85 bends the bending section 13 in conjunction with the operation of the bending operation knob 18 provided on the operation section 3 of the endoscope 1.

In the bending portion 13, the bending wire 85 passes through a wire receiver 86 formed of a hollow cylindrical metal member or the like provided in the vertical and horizontal directions of the bending piece 81.

Here, before the connection between the bending portion 13 and the flexible tube portion 14, the elasticity is provided in, for example, a coil-shaped rising wire insertion conduit 49 provided in the flexible tube portion 14. By passing through a resilient adjusting member 87 in the form of, for example, a metal wire selected from different ones, it is possible to suppress the variation in resiliency of the flexible tube portion 14 (see FIG. 12).

Although the material of the wire receiver 86 and the material of the curved wire 85 are both made of metal, the strength of the material of the wire receiver 86 is slightly smaller than that of the material of the curved wire 85 by adjusting the hardness and the like. It is set low. That is, when broken, the wire receiver 86 is set to be broken earlier than the curved wire 85.

In each of the embodiments described above, the side-view type endoscope is shown. However, the present invention is similarly applied to an endoscope of a perspective type or a direct-view type having a mechanism for raising a treatment instrument. can do. Further, in the embodiment, an example in which a water supply port is provided in the treatment instrument raising stand has been described, but not a water supply but a pipe and a mouth for air supply and suction are similarly provided, or an arbitrary combination thereof. May be provided. In this case, the visual field can be secured and the operation of the treatment can be similarly improved.

According to the description of the above embodiment, at least the following items and items obtained by arbitrarily combining them can be obtained. <Supplementary notes> A treatment instrument insertion channel formed in the insertion portion, through which the treatment instrument is inserted, an opening portion opened at the distal end portion of the insertion portion, communicating with the distal end side of the treatment instrument insertion channel, provided at the opening portion; And a movable endoscope having a treatment instrument raising table for changing a direction in which the treatment instrument guided through the treatment instrument insertion channel projects from the opening. A first conduit, and a second conduit provided on the treatment instrument raising table and communicating with the first conduit and having a distal end opening portion, move the treatment instrument raising table. By doing so, the second
An endoscope characterized in that the direction of an opening at the end of the conduit is changed.

2. 2. The endoscope according to claim 1, wherein the first conduit and the second conduit are formed by a single continuous tube. 3. The endoscope according to any one of claims 1 to 2, wherein the first conduit and the second conduit are water supply conduits. 4. 4. The endoscope according to any one of claims 1 to 3, wherein the viewing field direction has an angle with respect to the axial direction of the insertion section.

5. Removably attached to the endoscope end,
The endoscope according to any one of claims 1 to 4, wherein the endoscope has an adapter connected to an optical system of the endoscope and changing a viewing direction, wherein the adapter is provided with the treatment instrument raising base. .

6. A plurality of bending pieces are connected to form a bending portion, a hollow cylindrical wire receiving member fixed to the inner periphery of the bending piece, and a wire passing through the wire receiving member and connected to a distal end portion of the bending tube. By pulling the bent wire, the bending section is rotated, and the bending portion can be bent freely. In the endoscope, the strength of the wire receiving member is set lower than the strength of the wire. The endoscope according to any one of Items 1 to 5, wherein

(Prior Art of the Invention According to Item 5) Conventionally, as shown in Japanese Patent Publication No. 6-64248, for example, there has been an adapter type endoscope in which the end of the endoscope can be replaced. In this type of endoscope, the direction of the visual field coincides with the axis of the endoscope insertion portion (direct-view type) or the direction different from the axial direction of the endoscope insertion portion (perspective type or Side view type).
A viewing direction suitable for observation can be obtained.

However, in endoscopes provided with these interchangeable distal adapters, for example, in a direct-view type adapter endoscope, the treatment tool insertion channel is provided in the adapter portion, and the forceps insertion passage of the endoscope insertion portion is provided. By opening the aligned through-hole, it will have a function as a treatment tool insertion channel.However, in the case of a perspective type or side-view type endoscope, the end adapter of the endoscope insertion part is attached to the distal end adapter. Regarding the same position as the forceps insertion passage, simply opening the through-hole for inserting the forceps changes the direction of the visual field and the direction of the forceps insertion pipe, so that the treatment tool comes out of the visual field and accurate endoscopic viewing is performed. Mirror treatment was not always possible.

Therefore, in the invention according to the fifth aspect, in the adapter type endoscope, even when an adapter whose view direction is provided in a direction different from the axial direction of the endoscope insertion portion is used,
It is an object of the present invention to allow the protruding direction of the treatment tool to be directed to the viewing direction.

(Means and Function of the Invention According to Item 5) The endoscope is an adapter which is detachably attached to the end of the endoscope, is connected to the optical system of the endoscope, and changes the viewing direction. In the endoscope having the above-mentioned adapter, a treatment tool raising base for changing the protruding direction of the inserted treatment tool is provided, so that the view direction can be improved even when a perspective type or side view type adapter is attached. And the protruding direction of the treatment tool can be matched.

(Effect of the invention according to Item 5) By providing a forceps raising base on the distal adapter, the protruding direction of the treatment instrument can be changed even when the distal adapter that changes the viewing direction is used. The treatment performance when using a mirror is improved. By providing the raising wire for the treatment instrument raising table on the distal end adapter side, it is not necessary to store the wire in the endoscope main body side when using the direct-view type distal end adapter. When the raising wire is passed through the forceps channel, it is not necessary to provide a pipe for inserting the raising wire in the insertion portion, and the diameter of the insertion portion can be reduced. In addition, the work of passing the raising wire through a thin wire insertion conduit is eliminated, and the workability when attaching the distal end adapter with the treatment tool raising stand is improved.

(Prior Art of the Invention According to Item 6) Conventionally, as shown in Japanese Patent Application Laid-Open No. 62-79033, for example, a curved wire used for an endoscope and a wire receiving member for inserting and guiding the same. With respect to the above, a technique is known in which the wire receiving member is made of resin or the like to improve the slipperiness of the curved wire, thereby improving the resistance of the curved wire.

However, even in this example, the bending wire is broken due to friction between the bending wire and the wire receiving member. If the bending wire breaks during the endoscopic examination, the bending operation in the body cavity cannot be performed, and the endoscope insertion portion may not be able to be pulled out from the body cavity in some cases.

Therefore, an object of the invention according to the sixth aspect is to prevent the bending operation from being disabled due to the breaking of the bending wire.

(Means and Function of the Invention According to Item 6) The endoscope comprises a bending tube rotatably connected to the distal end of the endoscope, and a hollow cylindrical wire receiver fixed to the bending tube. In an endoscope having a member and a bending wire passing through a wire receiving member and connected to a distal end portion of a bending tube, the endurance of the wire receiving member is lower than the endurance of the wire, and the wire receiving member has a lower resistance than the bending wire. The member was destroyed first.

(Effect of the invention according to the sixth aspect) By making the hardness of the material forming the wire receiver lower than the hardness of the material forming the curved wire, when the bending portion is repeatedly bent, the bending portion is more bent than the bent wire. The wire receiver will wear faster. Thus, when the bending portion breaks down, the wire receiver is broken before the bending wire is cut. If the bending wire breaks during endoscopy or the like, it will be impossible to bend in the direction in which the bending wire has broken, making it difficult to remove the endoscope from the body cavity. Can continue to bend the bend. In addition, the user can know that an abnormality has occurred in the bending portion due to the broken wire receiver.

As described above, since the bending operation can be performed even when a failure occurs in the bending portion, the problem that the operation becomes inoperable at the time of inspection does not occur, and the failure of the bending portion is known in a state where the bending operation is not disabled. Can be.

[0064]

As described above, according to the present invention, by changing the raising angle of the treatment instrument raising table, the direction of water supply or the like can be changed accordingly. Further, even when the treatment tool is used, it is possible to substantially follow the direction in which the treatment tool is protruded, and to perform water supply or the like to the front of the protrusion. With such a function, a good visual field is ensured, and the operability of the treatment is improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a system of an electronic endoscope according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view of a distal end portion of the endoscope.

FIG. 3 is a longitudinal sectional view of a distal end portion of the endoscope taken along a portion where an optical system is installed.

FIG. 4 is a vertical cross-sectional view of a distal end portion of the endoscope along an installation portion of an elevator mechanism.

FIG. 5 is a vertical cross-sectional view of a distal end portion of the endoscope taken along a portion where an elevator platform mechanism is installed.

FIG. 6 is a longitudinal sectional view of a distal end portion of the endoscope, taken along a portion where a treatment instrument raising mechanism is installed.

FIG. 7 is a cross-sectional view of the treatment instrument raising stand.

FIG. 8 is a longitudinal sectional view of a distal end portion of an insertion portion of an endoscope according to a second embodiment of the present invention and a distal end adapter separated therefrom along an installation portion of an optical system thereof.

FIG. 9 is a perspective view of a distal end portion of an insertion portion of the endoscope according to the second embodiment and a distal end adapter separated therefrom.

FIG. 10 is a perspective view of a distal end portion of an insertion portion of the endoscope according to the second embodiment and a distal end adapter attached to the distal end portion.

FIG. 11 is a longitudinal sectional view of a bending portion of an insertion section of an endoscope according to a third embodiment.

FIG. 12 is a perspective view of a flexible tube portion of an insertion portion of the endoscope according to the third embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electronic endoscope, 2 ... Insert part, 12 ... Tip part, 13 ...
Bending part, 14 flexible tube part, 33 observation window, 34 illumination window, 35 treatment instrument raising chamber, 38 imaging device, 45 treatment instrument insertion channel, 47 treatment instrument raising table, 51 Water supply tube, 52: water supply hole, 53: water supply port.

Claims (2)

[Claims] 1. A treatment tool insertion channel formed in an insertion portion and through which a treatment tool is inserted, an opening portion opened at a distal end portion of the insertion portion and communicating with a distal end side of the treatment instrument insertion channel, An endoscope provided with the opening, and a treatment instrument raising base that changes a direction in which the treatment instrument guided through the treatment instrument insertion channel protrudes from the opening by being movable. A first conduit provided in the treatment unit, and a second conduit provided in the treatment instrument elevator and communicating with the first conduit and having a distal end opening, An endoscope wherein the direction of the opening of the second conduit end is changed by moving the elevator. 2. The endoscope according to claim 1, wherein said first conduit and said second conduit are formed by a single continuous tube.