JPH05307143A - Externally mounted channel device for endoscope - Google Patents

Abstract

PURPOSE:To prevent the flexibility of a curved part from being adversely affected by a channel tube when the channel tube is additively attached to an endoscope. CONSTITUTION:The channel tube 15 is attached slidably along the axial direction of an endoscope insertion part 3 by plural fixtures 16 and a mouthpiece 22 is provided at the front end of the channel tube 15. On the other hand, a front end guide 17 having a guide hole 21 is freely attachably and detachably fixed to a front end constituting part 6 of the endoscope. The mouthpiece 22 at the front end is brought into press-contact with the guide hole 21 of the front end guide 17 to transfer a treating means 23 to the guide hole 21 by sliding the channel tube 15 forward at the time of inserting the treating means 23 to the front end side of the endoscope; thereafter, this channel tube 15 is retreated from the range of the curved part 5 by sliding the channel tube 15 backward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external channel device for an endoscope which can additionally use a treatment tool such as forceps.

[0002]

2. Description of the Related Art Generally, a medical endoscope is used for observing the inside of a deep part such as a body cavity. For example, when observing the inside of the body cavity, treatment or cell There is a demand for a medical endoscope in which a treatment tool such as forceps can be introduced in order to collect the above. Further, even in an industrial endoscope, for example, in a pipe of a chemical plant facility, or inserted into various machinery such as an engine for observation and inspection, impurities inside these are
Foreign substances such as rust and deposits are often attached, and these foreign substances may interfere with observation. Therefore, in order to remove these and perform necessary measures, as with a medical endoscope, There is a demand for an industrial endoscope capable of introducing a treatment tool such as forceps.

In response to such a demand, many endoscopes have a channel inside the distal rigid portion, which is a channel for guiding a treatment tool such as forceps, inside the rigid portion. When a treatment tool such as the above is used, it is configured to be inserted from the opening of the proximal portion of this channel and projected from the opening of the distal end portion. By the way, when the endoscope has an original purpose of observation and only the purpose of observation, the above-mentioned channel is not necessary, and on the contrary, it causes a decrease in flexibility of the soft portion.

As a means for solving such a problem,
For example, in Japanese Utility Model Publication No. 1-38566, a channel holding device capable of inserting and holding a channel tube can be detachably attached to an insertion portion of an endoscope, and even in an endoscope having no channel, It is proposed that the channel can be assembled. Also, the actual development 6
In JP-A 2-177701, there is also proposed an endoscope which is inscribed in the endoscope insertion portion and has a separable channel tube, and the channel tube is fixed to the endoscope insertion portion with a band. .. Furthermore, Jitsuko Sho 60-34
According to Japanese Patent No. 242, an opening through which various treatment tools can pass is provided in a distal end portion of an endoscope, a thread is passed through the opening in advance, and when the treatment tool is used, the treatment tool is connected to the end of the thread. There has been proposed an endoscope which is adapted to be drawn into an opening. Furthermore, in Japanese Utility Model Publication No. 3-53210, a channel tube provided with convex portions on the outer peripheral surface at predetermined intervals in the axial direction and attached in the axial direction of the outer circumference of the endoscope insertion portion, and the outer circumference of the endoscope insertion portion. A plurality of fixed members that are fixedly provided at a distance in the axial direction and that have a movement restricting portion that restricts the movement of the channel tube within a predetermined range by abutting the insertion hole that movably inserts the channel tube and the convex portion of the channel tube. An endoscope device has been proposed which is configured by a tool and which does not extremely change the flexibility of the endoscope insertion portion and can attach the channel tube to the endoscope insertion portion without slack. There is.

As described above, when a channel tube is externally attached to an endoscope having no conventional channel, the channel tube is arranged from the proximal operation portion of the endoscope to the tip of the insertion portion. Therefore, in the conventional example in which the channel tube is fixed so as to be integrated with the insertion portion, the flexibility of the entire endoscope is lower than that of the original flexibility of the attached channel tube. Will be. Therefore, the bending portion which originally has high flexibility and bends with a small curvature has extremely low flexibility.

On the other hand, in the endoscope devices described in Japanese Utility Model Publication No. 3-53210 and Japanese Utility Model Publication No. 60-34242, the flexibility (change) of the flexibility of the insertion portion due to the channel tube attached to the insertion portion is reduced. Is reduced. However, in the endoscope device described in Japanese Utility Model Publication No. 3-53210, the flexibility of the bending portion is still affected and deteriorates.
On the other hand, in the endoscope device described in Japanese Utility Model Publication No. 60-342420, since the channel tube is not located on the outer circumference of the bending portion, the flexibility of the bending portion due to the use of the channel tube is not affected at all. , When the treatment tool is pulled through the opening of the distal end of the insertion portion in advance and the treatment tool is pulled by the thread, the treatment tool tip may be caught in the opening, and the treatment tool may not be securely attached, and the thread is inserted into the opening in advance. It is necessary to keep it inconvenient.

[0007]

As described above, in the conventional device additionally using the channel tube for the endoscope, the flexibility of the bending portion, which requires particularly high flexibility, is attached to the channel. There is an inconvenience that it is adversely affected by the tube, and in the conventional device that introduces the treatment tool with the thread, the operability of introducing the treatment tool is poor, and the thread is prepared in advance, or in some cases There is a risk that it may get caught and cannot be inserted.

The present invention has been made in view of these circumstances, and even if a channel tube is additionally attached to an endoscope, the flexibility of a curved portion is not adversely affected, and a treatment tool is provided. It is an object of the present invention to provide an external channel device for an endoscope with good insertion operability.

[0009]

In order to achieve the above object, an external channel device for an endoscope according to the present invention has a channel tube attached and held along an outer peripheral axial direction of an elongated insertion portion having a curved portion. In this configuration, the treatment instrument to be inserted into the channel tube is delivered from the rear side to the front side of the curved portion, and after the delivery, the treatment instrument delivery means that can retract from the curved portion is provided.

[0010]

[Operation] With this configuration, in order to deliver the treatment instrument inserted in the channel tube attached and held in the insertion portion from the rear side to the front side of the bending portion, the delivery means is arranged along the axial direction of the bending portion. It slides from the rear side to the front side of the bending portion, and after the delivery is completed, the delivery means is retracted from the range of the bending portion.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 relate to a first embodiment of the present invention, FIG. 1 is an explanatory diagram showing the entire endoscope device and external channel device, FIG. 2 is an explanatory diagram showing essential parts, and FIG. 3 is an operation diagram. FIG. 4 and FIG. 5 are explanatory diagrams showing a monitor screen, and FIG. 4 and FIG. 5 are explanatory diagrams showing a monitor screen.

As shown in FIG. 1, the endoscope to which this embodiment is applied is, for example, an electronic endoscope 1 in which an elongated insertion portion 3 extends forward from an operation portion 2 which also serves as a grip portion on the near side. It is set up. It should be noted that the endoscope is not limited to the electronic endoscope shown in the drawing, but is also applicable to an optical endoscope. The insertion part 3
Is an elongated flexible tube portion 4, a bending portion 5 continuously provided at the tip of the flexible tube portion 4, and a tip forming portion 6 continuously provided at the tip of the bending portion 5. Is equipped with. Further, a universal cord 7 is extended on a side portion of the operation portion 2, and the universal cord 7 is adapted to be connected to the light source device 9 via a connector 8 and the cord is also extended from the connector 8. 10 is branched and connected to a camera control unit 11, and a monitor 12 is connected to the control unit 11. The universal cord 7, the operation part 2 and the insertion part 3
Is internally provided with a light guide so that the illumination light from the light source device 9 is applied to the subject through the illumination window 13 of the tip forming section 6. On the other hand, the observation window 1 is provided in the tip forming section 6.
An image forming optical system for forming an optical image of the subject incident from 4 and photoelectrically converting it into an electric signal, and an image pickup device are provided inside, and a signal for transmitting the converted signal to the camera control unit 11. Lines are insertion part 3 and operation part 2
It is also installed in the universal cord 7.

The insertion portion 3 does not have a channel therein, and an externally attached channel tube 15 is attached along the insertion portion 3 when a channel is required. The external channel device in this embodiment is
Channel tube 15 and a plurality of channel fixtures 1
6 and a tip guide 17. The fixture 16 has an endoscope insertion hole 18 and a channel insertion hole 19, and the inner diameter of the channel insertion hole 19 is the channel tube 15.
Is formed to have a larger diameter than the outer diameter of the insertion portion 3, and the endoscope insertion holes 18 and the channel insertion holes 19 are located on the same side in the fixture 16 so as to be detachably fixed to the outer periphery of the insertion portion 3. At the same time, the fixture 16 at the most distal position is fixed in front of the bending portion 5. Further, the tip guide 17 has an endoscope insertion hole 20 and a treatment instrument guide hole 21, and the guide hole 21 is located on the same side as the channel insertion hole 19 of the fixing tool 16 to configure the tip of the endoscope. The outer circumference of 6 is detachably fixed. The channel tube 15 is inserted into the channel insertion holes 19 of the plurality of fixtures 16.
And the channel tube 15 is attached to the endoscope insertion portion 3. The channel tube 15 has a mouthpiece 22 at its tip, and the outer diameter of the mouthpiece 22 is larger than the inner diameter of the channel insertion hole 19 of the fixture 16. In addition, the channel tube 15 includes a plurality of fixtures 1.
When attached to the endoscope insertion portion 3 via 6 as described above, the base side is located in front of the side portion of the operation portion 2, and the mouthpiece 22 is located in front of the fixture 16 at the most distal position. It is supposed to be located. On the other hand, the channel tube 15 is slidable in a state where it is inserted into a plurality of fixtures 16. Therefore, by sliding the channel tube 15 forward, the mouthpiece 22 of the channel tube 15 is at the most distal position. Moving from the front of the fixture 16 to the rear end of the tip guide 17 constitutes a delivery means, and in this state, the channel tube 15 is connected to the tip guide 17 so that the channel tube 15 and the guide hole 21 are inserted and the inside of the channel tube 15 is inserted. The treatment tool 23 such as forceps that has been inserted through can be smoothly inserted into the guide hole 21 of the tip guide 17. After this insertion, the channel tube 15 is slid backward so that the mouthpiece 22 is positioned at the tip of the fixture 16 at the most distal position, the channel tube 15 is retracted from the range of the bending portion 5, and the channel tube 15 bends due to the existence of the channel tube 15. The bending performance of the portion 5 is prevented from being deteriorated.

On the other hand, the operation unit 2 has a trackball 31.
A trackball ON-OFF switch 32 for turning on and off the operation of the trackball 31 is provided in the vicinity thereof. A bending lever 35 for performing a bending operation on the bending portion 5 is provided in the operation portion 2. Further, function selection buttons A, B, 33, 34 for performing function selection in combination with the trackball 31 are provided.

As shown in FIG. 3, the camera control unit 11 includes a CCD drive pulse generator 37 for driving the CCD 36 of the image pickup device, a process circuit 38 for processing a video signal from the CCD 36, and this process circuit 38. An encoder circuit 39 for receiving the output of the above and generating a standard video signal is internally provided. In addition, a pulse count unit 40 that receives the pulse output of the trackball 31 provided in the operation unit 2 of the endoscope and counts pulses, a function control microcomputer 41, a menu screen created by the function control microcomputer 41, and an endoscope. It has a superimposing circuit 42 for synthesizing with an image.

With such a configuration, the channel tube 1
Since the outer diameter of 5 is smaller than the channel insertion hole 19 of the fixture 16, the channel tube 15 can slide in the axial direction with respect to the fixture 16. Therefore, by pushing the rear end of the channel tube 15 at the hand side, the channel tube 15 moves forward. The channel tube 15 can be moved until the mouthpiece 22 at the tip of the channel tube 15 hits the tip guide 17. Conversely, when the rear end of the channel tube 15 is pulled at the hand side, the channel tube 15 moves rearward. The channel tube 15 can be moved until the base 22 comes into contact with a fixture 16 provided at the rear end of the bending portion 5. That is, the distal end portion of the channel tube 15 has the curved portion 15
It is possible to move over the range from the front end to the rear end of the.

When the treatment tool 23 such as forceps is inserted into the channel tube 15, the channel tube 15 is pushed forward with the curved portion 5 straightened. Then, the mouthpiece 22 at the tip of the tube 15 comes to a position (shown by a dotted line in FIG. 2) corresponding to the guide hole 21 of the tip guide 17. Then, the treatment tool 23 such as forceps is guided to the distal end of the endoscope through the channel tube 15 and the guide hole 21. Channel tube 1 when operating the endoscope
5 is pulled toward the hand side to set the channel tube 15 so that the outer circumference of the curved portion 5 does not come (solid line in FIG. 2).

Next, the trackball 3 provided on the operation unit 2
The operation of selecting a predetermined function from a plurality of functions by turning 1 will be described. In FIG. 3, when the trackball 31 rotates, the rotary encoder X43 and the rotary encoder Y44 output pulses that are proportional to the amount of movement detected by the rotation, and the pulse counting unit 40 receives these pulses and outputs the data. To the function control microcomputer 41.

In the function control microcomputer 41, for example, a menu screen as shown in FIG. 4 is created, and the superimpose circuit 42 synthesizes the menu screen with the endoscopic image input from the encoder circuit 39 to generate a standard video signal. Is output. Further, the function control microcomputer 41 receives the data of the pulse counting section 40 and also receives the function selection buttons A, B, 33,
34 signals can be received. Since the function control microcomputer 41 performs a menu screen and function selection by software stored inside (not shown),
Various functions and selections are possible depending on the software. In the example of FIG. 4, when the trackball 31 is moved, the function control microcomputer 41 receives the data from the pulse counting section 40, and the items shaded in the MENU of the monitor screen are used to move the trackball 31. Move up and down accordingly and stop at an item.
If the software decides that the function selection button A33 is pressed and the function selection button B34 is pressed, the software selects and executes the shaded item when the button A33 is pressed. You can Button B34
When is pressed, it can be used to cancel the function of the shaded item. Further, for example, when the dimming control shown in FIG. 4 is selected by the procedure described above, a dimming control menu as shown in FIG. 5 is displayed and the rotation amount of the trackball 31 is detected, so that the dimming control bar 50 responds accordingly. If the function control microcomputer 41 can output a dimming signal according to the position of the bar 50, fine adjustment of dimming can be performed by the trackball 31 of the operation unit 2. Various functions can be controlled by operating the trackball 31 and the function selection buttons A, B, 33, 34 depending on the software inside the function control microcomputer 41.

The operation unit 2 has a trackball ON.
A -OFF switch 32 is provided. Trackball 3
Since 1 is not normally fixed and can be freely rotated, it will move even if the operation unit 2 is moved or the trackball 31 is touched by a finger, resulting in a malfunction. Therefore, turn off the trackball ON-OFF switch 32.
On the side, as can be seen from FIG. 3, the output line from the trackball 31 is disconnected, and it is possible to prevent malfunction even if the trackball 31 unexpectedly moves. The switch 32 is a trackball 31.
Although the output line from the above is disconnected, it may be physically fixed by pressing a friction material such as a rubber plate against the trackball 31. Alternatively, the signal line of the switch 32 may be connected to the function control microcomputer 41, and ON / OFF of the switch 32 may be detected by software to eliminate the signal from the trackball 31.

With this effect, various functions can be selected and executed by operating the trackball 31 and the function selection buttons A, B, 33, 34 provided in the operation section 2, and the operability is improved. Therefore, it is not necessary to provide a large number of switches in the operation unit as in the prior art, the number of functions that can be operated is not limited to the number of switches, and the number of functions can be freely set depending on software. It also enables operations that require fine adjustment, such as automatic dimming level setting, which was previously impossible. In addition, this device is not only versatile, but development cost can be kept low, because an operation system with different specifications can be created by simply developing software that controls functions without changing the operation unit. There is.

6 and 7 show an example in which an electric angle is added to the function selection by the trackball, FIG. 6 is an explanatory view showing an endoscope, and FIG. 7 is a circuit block diagram.

In FIG. 4, the electric angle mode is selected by selecting the electric angle item on the screen using the trackball 31. In this mode, when the trackball 31 is moved, the bending portion 5 bends as shown in FIG. 6, and the distal end forming portion 6 of the endoscope moves. This operation will be described with reference to FIG. When the trackball 31 moves, the function control microcomputer 41 reads the amount of movement. The function control microcomputer 41 sends an appropriate pulse to the stepping motor drive circuit 43 according to the operation amount. The stepping motor drive circuit 43 increases the pulse signal to a state necessary to move the stepping motor 44 and sends it to the stepping motor 44. As a result, the stepping motor 44 moves and the wire 45
Move back and forth. This wire 45 is connected to the tip forming part, and moves the tip forming part 6 as shown in FIG. Note that the series of operations of the function control microcomputer 41 is performed by the software inside the function control microcomputer 41, as in the above-described example. In this example, since the camera control unit 11 and the universal cord 7 are attachable / detachable by a connector (not shown), the stepping motor 44 for performing the angle operation is inserted into the operation portion 2, and the stepping motor drive circuit 43 is inserted into the camera control unit 11 side. However, the stepping motor drive circuit 43 may also be included in the operation unit 2. Further, if the universal cord 7 and the camera control unit 11 are not connector attachable / detachable type but always connectable type, the wire 45 is extended to the camera control unit 11 to arrange the stepping motor 44 in the camera control unit 11. You can also In FIG. 7, two stepping motors are arranged, but this is because the movement of the trackball 31 is two-dimensionally recognized and one stepping motor 44 is arranged for each direction. As a result, the tip forming section 6 can be angled (bent) in four directions.

Therefore, in this example, in addition to the effect of the configuration shown in FIG. 3, the electric angle operation by the trackball of the operation section becomes possible, and the operability is further improved. In addition, the trackball can be lightly and delicately operated by the belly of the thumb, and it is easy to perform the angle operation of the bending portion. Further, since various operations can be performed by the trackball, various kinds of concentrated operations that have been impossible until now can be performed.

Further, it may be arranged in either the operation section or the camera control unit, and the degree of freedom in design is large.

FIG. 9 is an explanatory view showing the second embodiment of the present invention.

In the external channel device according to the first embodiment described above, when the channel tube 15 is pushed in and slid forward, for example, when the bending portion 5 is not a straight tube but is curved, as shown in FIG. In some cases, the channel tube 15 does not advance straight, and the mouthpiece 22 at the tip portion does not coincide with the guide hole 21 of the tip guide 17. In this state, the treatment tool 23 inserted through the channel tube 15 cannot be inserted through the guide hole 21, and the treatment tool 23 may not be properly guided to the distal end side of the endoscope.

In the second embodiment, the mouthpiece 22 of the channel tube 15 advances along the curved portion 5 even when the curved portion 5 is curved, and the guide of the distal end guide 17 is guided. It is configured to match the hole 21.

In this embodiment, the channel tube 15
A ring base 61 is fixed to the tip of the ring base 61, and an endoscope insertion hole 62 and a channel tube fixing hole 63 are formed in the ring base 61. The inner diameter of the endoscope insertion hole 62 is larger than that of the bending portion 5. The channel tube fixing hole 63 is used as the channel insertion hole 1 of the fixture 16.
9 and a position corresponding to the guide hole 21 of the tip guide 17. Other configurations are the same as those in the first embodiment.

With this construction, the inner diameter of the endoscope insertion hole 62 is larger than the outer diameter of the bending portion 5, so that when the channel tube 15 is pushed in, the ring base 61 fixed at the tip is also attached. It moves forward along the outer circumference of the curved portion 5 and stops when the ring ferrule 61 comes into contact with the tip guide 17. On the contrary, when the channel tube 15 is pulled, the ring ferrule 61 moves until it abuts on the fixture 16 at the rear end of the bending portion 5. At this time, since the distance between the tip of the channel tube 15 and the bending portion 5 is regulated by the ring base 61,
Even when the curved portion 5 is curved, the curved portion 5 moves following the curved state of the curved portion, and when the channel tube is pushed in, the tip of the channel tube 15 comes to a position corresponding to the guide hole 21 of the tip guide 17.

Therefore, even if the bending portion 5 is not straight and is curved, the distal end of the channel tube 15 does not shift from the position corresponding to the guide hole 21, and the treatment tool 23 such as forceps is used. It can be surely inserted into the guide hole 21.

FIGS. 10 and 11 relate to the third embodiment of the present invention. FIG. 10 is an explanatory view showing a state where the coil tube is contracted, and FIG. 11 is an explanatory view showing a state where the coil tube is extended.

In this embodiment, as the delivery means, the first
Instead of the mouthpiece of the embodiment and the ring mouthpiece of the second embodiment, a coil tube 65 formed of a shape memory alloy (resin may be used, the same applies hereinafter) is arranged at the tip of the coil tube 15. The outer diameter of the coil tube 65 is equal to that of the fixture 16.
Is set to be larger than the inner diameter of the channel insertion hole 19. Further, a cord 66 for energizing the coil tube 65 is connected to the coil 65, and the cord 66 is guided to the proximal side along the insertion portion 3 like the channel tube 15, and a switch not shown. Can be turned on and off at. Other configurations are the same as those in the first embodiment.

In this structure, when the coil tube 65 is energized via the cord 66, the coil tube 65 expands as shown in FIG. 11, and the tip of the coil tube 65 is positioned so as to coincide with the guide hole 21 of the guide 17. Reach Then, after the treatment tool 23 such as forceps is inserted into the guide hole 21 of the distal end guide 17 through the coil tube 65, the coil tube 65 is turned off to contract the coil tube 65 as shown in FIG. The curved portion 5 is retreated from the range.

12 to 16 relate to a fourth embodiment of the present invention, FIG. 12 is a schematic explanatory view showing an essential part, FIG. 13 is a sectional view showing the essential part, and FIG. FIG. 15 is an explanatory view showing a connection structure with a tip adapter, FIG. 15 is a sectional view showing a main part when set for near point observation, and FIG. 16 is a sectional view showing a main part when set for far point observation. ..

In this embodiment, the tip guide 17 in the first to third embodiments is provided on the tip hood itself of the endoscope or the tip adapter. In FIG. 12, the third
An example in which the present embodiment is applied to the embodiment is shown.

In FIG. 12, a distal end adapter 71 is detachably attached to the endoscope distal end portion 6, and a guide hole 21 is formed in this adapter 71, and this guide hole 21 is The rear part is formed into a divergent shape so that the treatment tool can be easily inserted.

FIG. 13 shows the details of the tip adapter 71 and the endoscope tip component 6.

The electronic endoscope does not have a lens for forming a subject image in the tip forming section 6, and the objective optical system 7 is used.
2 are all arranged in the tip adapter 71. An objective optical system 72 in a tip adapter 71 is provided in the tip forming section 6.
An image pickup device 73 for converting the subject image formed by the device into an electric signal for transmission is provided. This imaging device 73
Is composed of a solid-state image sensor 74 that performs photoelectric conversion, several electronic components 75, a flexible cable 76, an electronic signal line 77, and the like. An infrared cut filter 78 is provided on the front side of the solid-state image sensor 74 for the purpose of improving image quality. , Crystal filter 7
9 is provided. The image pickup device 73 is mechanically aligned with and bonded to the main body 6a, which is an external component of the tip forming portion 6. The endoscope tip component 6 is provided with a lighting light guide (not shown).

The connection between the endoscope distal end constituting section 6 and the distal end adapter 71 is performed by connecting the male screw 81 of the set screw 80 and the distal end adapter 7 to each other.
1 Rear internal thread 82 is used. At this time, the tip adapter 71
And the optical axis alignment of the tip forming portion 6 is performed by the tip adapter 71.
1 of the positioning pin 83 of FIG.
It is performed by fitting as shown in 4. Tip adapter 7
Connection is made by rotating the set screw 80 in the circumferential direction while aligning 1 and the tip forming portion. Also, this set screw 8
0 not only connects and fixes the members to each other, but also adjusts the focus position of the optical system. This will be described below.

As shown in FIGS. 14, 15 and 16, when the positioning pin 83 is within the focus adjustment range in FIG. 14, the focus can be continuously changed. As shown in FIG. 15, the best focus of the optical system matches the near point at the position of the positioning pin X, and conversely, the best focus of the optical system matches the far point in the X near equal b as shown in FIG. .. In this way, when the tip adapter 71 is attached to the tip configuration 6, by focusing on the distance to the object to be observed, one set screw 80 can perform both connection fixing and focusing. Further, in this structure, since the optical system is focused when the tip adapter 71 is attached, it is necessary to increase the positioning accuracy of the objective optical system 72 with respect to the mechanical frame and the image pickup device 73 with respect to the main body 6a in the process. Absent. In other words, the positioning of these members in the assembly process can be performed by mechanical positioning with low accuracy but easy assembly without using an optical positioning method with high accuracy.

In FIG. 13, the elastic member 86 and the spacing ring 87 provided in the tip adapter 71 are intended to suppress rattling that occurs between the members when the tip adapter 71 is attached to the tip component 6. The spacing ring 87 pressed by the elastic member 86 presses the end face of the tip forming portion 6 to suppress rattling and keep the focus position constant.

In this structure, the tip adapter 71 is attached to the endoscope tip forming portion 6 by rotating the set screw 80. At this time, the focus adjustment is performed according to the position of the positioning pin 83, that is, the distance between the tip adapter 71 and the tip forming portion 6. Other operations are the same as in the third embodiment.

[0044]

As described above, according to the present invention, even if a channel tube is additionally attached to the endoscope, the flexibility of the bending portion is not adversely affected, and the treatment instrument is inserted. This has the effect of improving operability.

[Brief description of drawings]

1 to 5 relate to a first embodiment of the present invention,
FIG. 1 is an explanatory view showing the entire endoscope device and external channel device.

FIG. 2 is an explanatory diagram showing a main part

FIG. 3 is a block diagram showing a circuit configuration of an operation unit, a camera control unit, etc.

FIG. 4 is an explanatory diagram showing a monitor screen.

FIG. 5 is an explanatory diagram showing a monitor screen.

6 and 7 show an example in which an electric angle is added to the function selection by a trackball, and FIG. 6 is an explanatory diagram showing an endoscope.

FIG. 7 is a circuit block diagram.

FIG. 8 is an explanatory diagram showing a defect occurrence of the first embodiment.

FIG. 9 is an explanatory diagram showing a second embodiment of the present invention.

FIG. 10 and FIG. 11 relate to a third embodiment of the present invention, and FIG. 10 is an explanatory view showing a state in which the coil tube is contracted.

FIG. 11 is an explanatory view showing a state in which the coil tube is extended.

12 to 16 relate to a fourth embodiment of the present invention, and FIG. 12 is a schematic explanatory view showing a main part.

FIG. 13 is a cross-sectional view showing a main part

FIG. 14 is an explanatory view showing a connection structure between an endoscope distal end configuration portion and a distal end adapter.

FIG. 15 is a cross-sectional view showing a main part when set for near point observation.

FIG. 16 is a cross-sectional view showing a main part when set for far point observation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Endoscope 2 ... Operation part 3 ... Insertion part 5 ... Bending part 6 ... Tip part 15 ... Channel tube 16 ... Fixing tool 17 ... Tip guide 21 ... Guide hole 22 ... Base

Claims (1)

[Claims] 1. A device for additionally holding a channel tube along an outer peripheral axial direction of an elongated insertion portion having a curved portion, wherein a treatment tool to be inserted into the channel tube is provided from the rear side to the front side of the curved portion. An external channel device for an endoscope, which has a treatment tool delivery means for delivering and withdrawing from the curved portion after delivery.