JPH08160314A - Endoscope - Google Patents

Abstract

PURPOSE: To lessen the burden acting on the internal organs in an insertion part at the time of curving a curving part. CONSTITUTION: A channel 45 in the insertion part 8 is withdrawn into the front end side when the front end side of the channel 45 is fixed and another end is formed as a free end and when a curving part 11 is curved maximum in a direction where the channel 45 comes on the side outer than a central axis. The length at which the channel 45 is pushed into the insertion part 8 is fixed as (α/2) when the length to be withdrawn at this time is defined as α. Consequently, the moving quantity of the channel 45 in a central direction is smaller than when the length at which the channel 45 is pushed into the insertion part is set at '0' if the curving part 11 is curved maximum in the direction where the channel 45 comes on the side outer than the central axis. There is no possibility that the channel 45 is pushed to the outer side of the curving part 11 and is pressed to wire rest 48 when pincers 46 are inserted as compared to the case when the length to push the channel is set at >=α.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope which has an insertion portion to be inserted into a body cavity having a curved portion and which observes and treats an observation site.

[0002]

2. Description of the Related Art Conventionally, endoscopes have been widely used which are capable of observing a region to be examined and performing various treatments by inserting an elongated insertion portion into a body cavity or the like.

Generally, in an endoscope having a flexible insertion portion, the observation optical system provided at the distal end portion of the insertion portion can be observed in a desired direction and easily inserted into a subject site. In addition, the insertion portion is provided with a curved portion.

When the bending portion is bent, the internal components inside the insertion portion outside the central axis of the bending portion have a larger bending radius than the central axis.
More length is needed. In other words, when it is bent, the internal components outside the central axis are drawn into the tip. However, since one of the built-in items is fixed to the front end and the other is fixed to the rear end side, the built-in items located outside the central axis move toward the center by the length retracted when the bending section is bent. .

That is, as shown in FIG. 14, a bending portion 101 is provided on the tip end side of the insertion portion, and a tip forming member 102 is connected to the tip of the bending portion 101. A light guide fiber 103, a channel 104, an objective optical system (not shown), an image transmission means, etc. (not shown) are provided in the insertion section and the bending section 101. The light guide fiber 103 transmits the illumination light and irradiates the subject through the illumination optical system 105 provided in the tip forming member 102, and the channel 104 is a channel provided in the tip forming member 102 through which forceps 106 described later are inserted. Each treatment is performed on the subject by projecting the tip of the forceps 106 through the opening 107.

The bending portion 101 pivotally fixes a plurality of bending pieces 110 so that the bending portion 101 can be bent in a desired direction by a bending operation means (not shown). Further, the wire 111 from the bending operation means (not shown) has its tip fixed to the tip forming portion 102 via a wire receiver 112 provided on the bending piece 110.

In such an endoscope, for example, as shown in FIG.
As shown in FIG. 4, when the channel 104 is bent while being placed outside the center of the bending portion 101, the channel 104 moves to the center, compresses the light guide fiber 103, and the light guide fiber 103 is broken. There is a risk of being lost.

Therefore, conventionally, in order to prevent the channel 104 from being pulled and moving to the inside of the curve, the channel 104 is fixed by fixing the tip end side of the channel 104 and leaving the other end free. At the same time, when the bending portion 101 is bent to the maximum in the direction in which the channel 104 is located outside the central axis, as described above, the channel 10
Channel 4 is measured by measuring the amount of 4 drawn into the tip side.
4 was fixed in a state of being pushed into the insertion portion more than its retracted amount. That is, when the curved portion 101 was straight, the channel 104 was in a loosened state in the insertion portion.

[0009]

However, when the amount of pushing of the channel 104 described above is large, the channel 104 has a large slack even in the bending portion 101. Therefore, for example, as shown in FIG. When the forceps 106 is inserted through the channel 104 in this state, the channel 104 is bent by the insertion force of the forceps 106.
1, the forceps 106 easily pushes the wire 111
Channel 104 for receiving the wire receiving 112
Unevenness occurs in that part of the. As a result, the unevenness increases the resistance, and there is a problem that the forceps 106 cannot be easily inserted. In addition, not only the force for inserting the forceps 106 becomes heavy, but also there is a problem that the channel 104 has a hole due to the insertion force of the forceps 106.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an endoscope capable of reducing the burden on the internal components in the insertion portion when the bending portion is bent. There is.

[0011]

An endoscope according to the present invention comprises an insertion portion formed by connecting a distal end portion, a distal end portion, a bending portion, and a flexible tube in this order, and a bending operation for bending the bending portion. A built-in body that is configured with an operation section having means, is mounted in the insertion section, has a tip fixed to the tip section, and a base end fixed to a built-in object fixing section provided on the base end side of the body. In the endoscope provided with the object, the length of the built-in object in the insertion portion longitudinal direction is the length from the distal end portion to the built-in object fixing section in a state where the bending section is not curved, The length at which the base end of the internal body at the time of maximum bending is drawn into the insertion portion by the bending portion by the bending operation means when the distal end of the internal body is fixed to the distal end and the base end of the internal body is a free end. When the bending part is bent, it can be inserted by maximizing the length It makes it possible to reduce such a built-in load of the internal.

[0012]

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

1 to 7 relate to a first embodiment of the present invention, FIG. 1 is a schematic configuration diagram of an endoscope system, and FIG. 2 is a longitudinal sectional view of a tip of the endoscope of FIG. 1 including an image pickup unit. Figure,
3 is a configuration diagram showing a detailed configuration of the nozzle of FIG. 2, FIG. 4 is an explanatory diagram for explaining the operation of the nozzle of FIG. 3, and FIG. 5 is a front view of the distal end surface of the insertion portion of the endoscope of FIG. 6 is a longitudinal sectional view of the imaging unit of FIG. 2, and FIG. 7 is a longitudinal sectional view of the tip of the endoscope of FIG. 1 including a channel through which forceps are inserted.

An outline of the system will be described with reference to FIG. 1. Reference numeral 1 is an endoscope, reference numeral 2 is a light source device, and reference numeral 3 is a video processor incorporating a video signal processing circuit and a drive circuit. 3 has monitor 4, VTR
Peripheral devices such as the deck 5, the video printer 6, and the video disk 7 are connected to output the observation image of the endoscope.

The endoscope 1 has, for example, an elongated and flexible insertion portion 8 which can be inserted into a body cavity, and an operation portion 9 which is connected to the proximal end side of the insertion portion 8. are doing.

A universal cord 13 having a connector device 13a at its tip is extended from the side of the operation part 9, while the light source device 2 has a connector receiver 2a to which the connector device 13a is connected. Is provided.

The connector device 13a includes a connector 10a.
The signal code 10b provided at the tip is extended, and the output of the solid-state image pickup device of the endoscope 1 described later is supplied to the video processor 3 via the connector 10a.

By connecting the connector device 13a and the connector receiver 2a, the illumination light generated by the light source lamp 2b of the light source device 2 and condensed by the condenser lens 2c is stored in the universal cord 13. 2 arranged in
It can be guided to the tip of the endoscope via the light guide 14 shown in FIG.

A distal end portion 12 is provided on the distal end side of the insertion portion 8 via a curved portion 11 formed by rotatably coupling a plurality of bending pieces 11a shown in FIG.
By rotating the bending operation knob 9b (bending operation means) provided in the operation portion 9 and pulling the wire interlocking therewith, the tip portion 1 to which the wire is fixed.
By bending the bending piece 11a, the direction 2 can be directed to the observed region.

Further, as shown in FIG. 2, an illumination through hole 15 is formed in the tip portion 12, and the light source device 2 is provided.
The illumination light by the light guide 14 that passes through the insertion portion 8
The light is transmitted to the observation site through the light distribution lens 16 fixed to the illumination through hole 15.

Further, an observation through hole 18 in which a cover lens 18b is interposed via a first lens frame 18a is formed in the tip portion 12, and an observed region is observed through this observation through hole 18. Is being observed. More specifically, the second lens frame 25 is provided on the opposite side of the first lens frame 18a from the cover lens 18b via the insulating member 26.
Has been fixed. An objective lens system 27, which will be described later, is formed in the second lens frame 25. The objective lens system 27 includes a plurality of lens groups each having an optical axis that matches the optical axis of the observation through hole 18 and the optical axis of the cover lens 18b. Has been done. Then, the image of the site to be observed is captured by the imaging unit 28 via the objective lens system 27 to observe the site to be observed.

At the tip portion 12, the cover lens 1 is provided.
8b is provided with a nozzle 19 for supplying air and water, and an operating switch 9a provided in the operating section 9
By operating (see FIG. 1), air and water are supplied to the cover lens 18b through the nozzle 19 so that fogging on the surface of the cover lens 18b can be removed.

The endoscope 1 is provided with an air / water supply pipe 21 to which an air / water supply tube 20 provided inside the insertion portion 8 is connected. The air / water supply pipe 21 communicates with the above-mentioned nozzle 19 provided on the distal end side via an air / water supply pipe line 22. And the nozzle 19
It is fixed to the nozzle mounting cylinder 23 fixedly provided inside the tip portion main body 12a, and the tip side is exposed from the tip portion 12 of the endoscope. A silicone adhesive 24, for example, is applied to the gap between the nozzle 19 and the tip cover 12c.

By the way, as described above, the nozzle 19 for supplying air and water is provided on the end face of the endoscope so as to project to clean the surface of the cover lens 18b.

However, when the projections such as the nozzles 19 for air and water supply provided on the tip end surface of the endoscope are provided near the peripheral surface of the endoscope tip end side, for example, a medical endoscope is used as a stomach. When it is inserted into the inside, the tip of the endoscope may come close to the stomach wall, but at that time, there is a risk that the protruding portion directly contacts the stomach wall and damages the stomach wall.

Therefore, in the present embodiment, the safety is improved when the insertion portion is inserted and when the observation is performed by configuring the tip surface as follows.

That is, as shown in FIG. 3, the nozzle 19 protruding from the tip cover 12c and the tip cover 12c.
The angle between the tangent 49 to the curved surface and the axial direction of the endoscope tip is indicated by β. The distance between the tangent 49 and the contact point A of the nozzle and the tip cover 12c is x, and the tangent 49 and the tip cover 12c.
Let y be the distance between the contact point B and the contact point A in the direction perpendicular to the tip axis.

The nozzle 19 is provided so as to project at an angle β of 45 ° or more, that is, x <y.

FIG. 4 shows a state where the above-mentioned endoscope is inserted into a human body and the curved surface portion of the distal end cover 12c is in contact with the inner wall 50 of the body cavity such as the stomach wall. As shown in FIG. 4, when the angle between the axial direction of the endoscope and the inner wall 50 of the body cavity is within 45 °, the nozzle 19 is less likely to contact the inner wall 50 of the body cavity.

Therefore, if the angle between the distal end axis of the endoscope and the inner wall 50 of the body cavity is within 45 °, there is no risk of the nozzle 19 contacting the inner wall 50 of the body cavity and damaging the mucous membrane on the surface of the inner wall 50 of the body cavity.

That is, the angle between the axial direction of the endoscope and the inner wall of the body cavity is at least 45 ° or less, and the tip of the endoscope is brought into contact with the inner wall of the body cavity, so that the protruding portion does not damage the inner wall of the body cavity and the safety is improved. Can be improved.

On the other hand, a forceps through hole 17a shown in FIG. 5 is formed in a portion of the tip portion 12 which is deflected to the outer peripheral side.
The forceps through hole 17a is communicated with a forceps insertion port 17b (see FIG. 1) formed in the operation portion 9 through a channel 45 (built-in object) described later provided in the insertion portion 8. The forceps inserted into the insertion opening 17b is projected from the tip portion 12 through the forceps through hole 17a.

Further, in the image pickup optical system of the endoscope 1, as shown in FIG. 6, the solid-state image pickup element 29 constituting the image pickup unit 28 is orthogonal to the optical axis of the objective lens system 27, for example,
It is fixed with an epoxy adhesive 30.

A device frame 29a for supporting the solid-state image pickup device 29.
The tip end of the shield frame 32, which is formed in a tubular shape and whose outer periphery is covered with an insulating cover 32a made of, for example, vinyl chloride, is fixed to the outer periphery on the base end side of the. A base end side of the shield frame 32 extends rearward, and a circuit board 33 constituting an image pickup unit is held in the extended portion substantially parallel to the optical axis. And the lead wire 29b of the solid-state image sensor 29 are connected to each other.

On the circuit board 33, for example, on both sides,
Electrical components, such as a transistor 34, an IC 35, and a capacitor 36, which form a drive circuit of the solid-state image pickup device 29 and a preamplifier, are fixed by soldering. Also,
A signal cable 38 including a plurality of cables 37 is fixed to the circuit board 33 via a wiring pattern (not shown) by a cable fixing member 39, and an inner conductor 37a is fixed to the circuit board 33 by soldering.

The signal cable 38 has, for example, a plurality of cables 37 covered with an integrated shield member 38a and is fixed by a press-winding member 38b, and further has, for example, an F-shaped outer periphery.
A cable outer cover 38c made of EP or the like is coated and configured. Further, the outside of the signal cable 38 is covered with a cable protection tube 40 formed of, for example, EPTFE, and the tip end side of the cable protection tube 40 is abutted against the cable fixing member 39, for example, epoxy. It is fixed by a system adhesive. It should be noted that a thread may be wound from the outside to be adhesively fixed. The cable protection tube 40 is further covered with the elastic covering material 31.

As shown in the cross section of the insertion portion including the channel for inserting the forceps in FIG. 7, the bending portion 11 is provided on the tip side of the insertion portion 8 as described above, and the tip portion 12 is provided at the tip of the bending portion 11. Are lined up. Insertion part 8 and bending part 11
Light guide 14 and channel 45, which are built-in components
Further, the objective lens system 27 and the image pickup unit 28 (see FIG. 2) are provided. The light guide 14 transmits the illumination light and irradiates the subject through the light distribution lens 16 provided on the tip portion 12, and the channel 45 inserts the forceps 46 and the through hole for the forceps provided on the tip portion 12. Each treatment is performed on the subject by projecting the tip of the forceps 46 from 17a.

The bending portion 11 has a plurality of bending pieces 11a.
Is pivotally fixed so that the bending portion 1 can be rotated by a bending operation knob 9b (see FIG. 1) provided in the operation portion 9.
1 can be bent in a desired direction. The tip of the wire 47 from the bending operation knob 9b is fixed to the tip forming portion 12 via a wire receiver 48 provided on the bending piece 11a.

In the endoscope 1, the channel 4 in the insertion section 8
The tip side of 5 is fixed, the other side is made a free end, and the curved portion 1
When 1 is maximally curved in the direction in which the channel 45 is located outside the central axis, the channel 45 is pulled toward the distal end side as described in the related art. The length pulled in at that time is α. In this embodiment, the amount of pushing the channel 45 into the insertion portion 8 is fixed at (α / 2). For example, when the measured value of α is 4 mm, the pushing amount is 2 mm.

Therefore, in the endoscope 1 of the present embodiment, when the bending portion 11 is bent in the maximum direction in which the channel 45 is located outside the central axis, the amount of pushing the channel 45 into the insertion portion is set to "0". The amount of movement of the channel 45 toward the center is small compared to the time. Further, as compared with the case where the pushing amount is α or more, the channel 45 is pushed to the outside of the bending portion 11 when the forceps 46 is inserted, and the wire receiver 4
There is no risk of being pressed against the 8.

As a result, the built-in components such as the light guide 14 are not damaged, the forceps 46 can be easily inserted, and there is no risk of puncturing the channel 45.

In the above embodiment, the pushing amount may be an amount between 0 and α even if it is not α / 2. Channel 4 and susceptibility to damage such as light guide 14
Set according to the balance of damage susceptibility of 5.
For example, when α is 4 mm, in order to give priority to reducing the influence on the light guide 14, it is better to set the pushing amount to 3 mm, and to give priority to reducing the influence on the channel 45, , It is better to set the pushing amount to 1mm.

Further, if the signal cable from the image pickup unit, the light guide, etc. are pushed in by a length longer than the maximum bending of the bending portion, they are pushed and damaged by the wire receiver on the outside in the bending tube, and other built-in parts. There is a risk that other built-in objects will be damaged by pushing the object, but it should be pushed in by the pushing amount shown above and fixed in the operation part or the connector part which is the proximal end side of the endoscope body. By doing so, the cable and the light guide may be prevented from being damaged.

Next, the second embodiment will be described. 8 to 13 relate to the second embodiment of the present invention. FIG. 8 is a configuration diagram showing a configuration of a zoom ring and a helicoma which are zoom mechanisms of an endoscope, and FIG. 9 is a first diagram of the zoom mechanism of FIG. The block diagram which shows the structure of the zoom ring and helicoma of a modification, FIG. 10: is a block diagram which shows the structure of the 2nd modification of the zoom mechanism of FIG.
11 is a first configuration diagram showing a zoom mechanism of a conventional endoscope, FIG. 12 is a second configuration diagram showing a zoom mechanism of a conventional endoscope, and FIG. 13 is a zoom mechanism of a conventional endoscope. It is a 3rd block diagram shown.

In the second embodiment, in addition to the structure of the first embodiment for an endoscope having a zoom mechanism in the image pickup optical system, the zoom mechanism can be operated normally even if a bending operation is performed. Therefore, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

In a conventional endoscope having a zoom mechanism, as shown in FIG. 11, a zoom ring 67 having a threaded inside is provided in the operation portion, and a screw portion which makes a pair with the screw of the zoom ring 67 is provided. The helicopter 68 included in the section is the zoom ring 6
By turning 7, it moves in the direction of the rotation axis. The helicopter 68 and the zoom wire 63, and the zoom wire 63 and FIG.
The zoom lens frames 62 in the tip portion 12 shown in FIG. 2 are connected to each other.

When switching zooming such as enlargement or reduction, the zoom wire 63 is pushed and pulled by turning the zoom ring 67 provided on the operation portion, and the zoom lens frame 62 shown in FIG. 12 is slid. When the bending portion is bent so that the zoom wire 63 is located outside the central axis of the bending portion, the zoom wire 63 is pulled toward the distal end side. Therefore, the bending portion is straight and the helicopter is bent. The positional relationship between 68 and the zoom ring 67 changes.

Therefore, the moving distance of the helicopter 68 is larger than the sliding distance of the zoom lens frame 62. Even if the zoom lens frame 62 moves to the most distal position, the helicopter 68 can be pushed by further turning the zoom ring 67, so that a force is applied to the zoom wire 63 connected to the helicopter 68 in the compression direction. The zoom wire 63 bends.

However, the zoom wire 63 is replaced by the helicopter 68.
When the helicopter 68 is bent in a direction in which it becomes convex toward the screw surface side, as shown in FIG. 13, the corner 71 of the screw portion of the helicopter 68 hits the zoom ring 67 and is scraped off, which causes a problem that it does not operate normally. .

Therefore, in the second embodiment, an endoscope which can prevent the helicopter 68 from being scraped will be described.

In the endoscope of the second embodiment, as shown in FIG. 8, at the position closer to the screw surface side of the helicopter 68 of the zoom wire 63 connected to the helicopter 68 on the tip side of the helicopter 68. , Pins 70 are provided. The other structure is the same as that of the first embodiment.

With such a configuration, the zoom ring 67
When the helicopter 68 is pushed toward the zoom wire 63 side by turning, when the zoom wire 63 tries to bend in a direction in which the zoom wire 63 is convex on the screw surface due to a bending operation, the zoom wire 63 is on the pin 70, so The helicopter 68 bends in a direction that becomes convex to the corner 71 of the screw portion of the helicopter 68.
Tilts in a direction that does not hit the zoom ring 67. When the helicopter 68 moves to the side opposite to the zoom wire 63 by turning the zoom ring 67, a pulling force acts on the zoom wire 63, so that the zoom wire does not bend. Other functions are the same as those in the first embodiment.

As a result, in addition to the effect of the first embodiment, even when the bending operation is performed, the corner 71 of the threaded portion of the helicopter 68 does not hit the zoom ring 67, so that the helicopter 68 is not shaved, and is always kept normal. The zoom mechanism can be operated.

Next, a first modification of the second embodiment will be described.

In the first modification of the second embodiment, as shown in FIG. 9, the zoom wire 63 moves in the moving direction of the helicopter 68 so that the rear end side of the zoom wire 63 faces the screw surface side of the helicopter 68. It is fixed obliquely to the helicopter 68.

Since the zoom wire 63 is already bent in a direction in which it is convex on the side opposite to the screw surface when the helicopter 68 is not pushed in, the zoom wire 63 is zoomed in a direction in which the screw surface side is convex when the helicopter 68 is pushed in. The wire 63 does not bend. Therefore, the helicopter 68 tilts in a direction in which the corner 71 of the screw portion of the helicopter 68 does not hit the zoom ring 67.

Therefore, since the corner 71 of the screw portion of the helicopter 68 does not hit the zoom ring 67, the helicopter 68 is not scraped.

Next, a second modified example of the second embodiment will be described.

As described above, in the endoscope having the conventional zoom mechanism, in FIG. 11, the zoom ring 67 having a threaded inside is provided in the operation portion, and the threaded portion forming a pair with the screw of the zoom ring 67 is provided. By rotating the zoom ring 67, the helicopter 68 provided in part moves in the rotation axis direction. The helicopter 68 and the zoom wire 63, and the zoom wire 63 and the zoom lens frame 62 of FIG. 12 are connected, respectively. When switching zooming such as enlargement and reduction, the zoom wire 63 is pushed and pulled by turning the zoom ring 67 provided in the operation unit, and the zoom lens frame 62 of FIG.
Is done by sliding.

However, in the above mechanism, when switching the zoom, it is necessary to hold the main body with one hand and rotate the ring with the other hand. In addition, since the projection provided on the zoom lens frame 62 for fixing the zoom frame and the zoom wire 63 and the zoom wire 63 are present, the outer diameter of the insertion portion must be increased correspondingly.

Therefore, in the second modification of the second embodiment,
An endoscope in which the switching of the zoom is facilitated and the outer diameter of the insertion portion is reduced will be described.

As shown in FIG. 10, in the second modification, the coil 6 is attached to the zoom lens frame 62 made of a ferromagnetic material.
5 is wound around the zoom lens frame 62, and before and after the zoom lens frame 62, the permanent magnets 64 are provided in a direction in which the zoom lens frame 62 side is the N pole so as to repel each other. Lead wires 66 are connected to both ends of the coil 65, and the on / off of the current flowing through the coil 65 and the direction of the current are switched by a switch provided in the operation unit.

Then, when a current flows through the coil 65 by the switch of the operation section, the zoom lens frame 62 becomes an electromagnet. Depending on the direction of current flow, N of the zoom lens frame 62
The zoom lens frame 62 slides to the front end side when the S pole is reversed and the front end side of the zoom lens frame 62 becomes the S pole, and to the rear end side when the front end side of the zoom lens frame 62 becomes the N pole. .

Therefore, the zoom can be switched by pressing the switch O
Since it is performed only by N / OFF, the zoom can be easily switched with one hand, and the operability is improved. Also,
Since the projection of the zoom wire and the zoom lens frame 62 for fixing the zoom wire is eliminated, the diameter of the insertion portion can be reduced.

The permanent magnet 64 is used for the zoom lens frame 6
The 2 side may be the south pole.

[Additional Notes] (1-1) The endoscope according to claim 1, wherein the built-in object is a forceps insertion channel.

(1-2) In the endoscope having a projecting portion on the tip end surface of the insertion portion to be inserted into the body cavity, the height of the projecting portion from the tip end surface is the projection portion and the An endoscope characterized in that it is shorter than the distance of the side peripheral surface of the tip of the insertion part.

(1-3) The endoscope according to item (1-2), wherein the protruding portion is a nozzle for cleaning an objective lens.

In the endoscope described in the additional item (1-2), the height from the tip end face of the projecting portion provided on the tip end face of the insertion portion is more than the distance between the projecting portion and the tip side peripheral surface. Because of the short length, if the angle between the axial direction of the endoscope tip and the inner wall of the body cavity is within 45 °, it is difficult for the protruding portion to contact the inner wall of the body cavity, improving the safety when inserting or observing the endoscope. Can be done.

(1-4) Inside of the helicopter, a helicoid that has a threaded ring on the inside, a helicoid that has a threaded portion that makes a pair with the ring, and that moves in the direction of the rotation axis with the rotation of the ring. In an endoscope including a zoom mechanism including a wire connected to the wire and a lens provided in a lens frame fixed to the wire, the wire is convex in a direction opposite to a threaded portion of the helicoma. An endoscope characterized by being bent so that it bends like this.

(1-5) At the tip end side of the helicopter, at a position close to the screw part side of the helicopter of the wire,
The endoscope according to appendix (1-4), wherein a projection is provided.

(1-6) The wire is fixed to the helicopter obliquely with respect to the moving direction of the helicoma so that the rear end side of the wire faces the threaded portion of the helicoma. The endoscope according to item (1-4).

In the endoscope described in the additional items (1-4) to (1-6), the angle of the threaded portion of the helicoma is ringed by bending the wire in a direction in which the wire is convex on the side opposite to the threaded portion. As a result, the helicoma is prevented from being scraped off as a result, and the zoom mechanism can always operate normally.

(1-7) In an endoscope having a zoom mechanism for moving a part of the lenses of the objective lens group provided at the distal end portion of the insertion part back and forth, a lens that moves back and forth together with the lens. A first facing member provided integrally with the frame; a second facing member arranged at least at one of the front and the back of the first facing member provided in the tip forming portion that houses the lens frame; A magnetic body provided on either one of the first facing member and the second facing member and a permanent magnet provided on the other side, a coil wound around the magnetic body, and positive and negative currents in the coil can be reversed. An endoscope comprising an energizing means for energizing.

In the endoscope described in the additional item (1-7), the permanent magnets are arranged in front of and behind the lens frame in directions to repel each other, and the coil is wound around the lens frame to energize the coil and the electromagnet to the lens frame. By providing a function, reversing the positive / negative of the current passing through the coil, and moving the lens frame back and forth, it is possible to easily switch the zoom and to reduce the outer diameter of the insertion portion.

(1-8) The endoscope according to item (1-7), wherein the second facing member is provided in front of and behind the lens frame.

(1-9) The endoscope described in the additional item (1-7) or (1-8), wherein the magnetic body is provided on the first facing member.

(1-10) The endoscope according to item (1-7) or (1-8), characterized in that the magnetic body is provided on the second facing member.

By the way, in the conventional insertion aid for a colonoscope, the insertion portion into the body has a length from the anus to the S-shaped colon and is opaque.

Generally, the optical specifications of the lower digestive tract endoscope such as the large intestine are such that the subject is focused only when the distance between the subject to be observed and the objective lens at the tip of the endoscope is within a certain range. You can observe it. For observation and treatment using an endoscope, for example, at least a few mm
It is necessary to take some distance. Since the anus is contracted by the anal sphincter and is always occluded, the colon wall of the anus is too close to the objective lens at the tip of the endoscope when the colon is examined by endoscopic examination of the colon. No observation or treatment can be done.

However, since the conventional insertion assisting tool has a length from the anus to the sigmoid colon, is opaque, and has no side hole, it is possible to observe and treat the anus. There wasn't.

An embodiment of the insertion assisting tool which secures the field of view of the endoscope and facilitates observation and treatment of the anus by the endoscope will be described.

First, a first embodiment of an insertion assisting tool which secures the field of view of the endoscope and facilitates observation and treatment of the anus by the endoscope will be described.

16 and 17 relate to the first embodiment of the insertion assisting tool which secures the field of view of the endoscope and facilitates observation and treatment of the anus by the endoscope. FIG. 16 shows the configuration of the insertion assisting tool. And FIG. 17 is an explanatory view for explaining the operation of the insertion assisting tool of FIG.

As shown in FIG. 16, an anal sliding tube 81, which is an insertion assisting tool of this embodiment, has a transparent transparent tube 82 made of resin or the like and a holding portion 83 connected to each other. A cutout portion 84 is provided.

The transparent tube 8 of the sliding tube 81 for anus is inserted before or at the same time as the insertion of the insertion portion 8 of the endoscope.
Insert 2 into the anus. Since a certain distance is maintained between the transparent tube 82 and the objective lens, the subject will not come too close. Since it has a cylindrical shape, the position of the notch 84 can be freely aligned with the lesion by rotating, and the lesion can be exposed.

As shown in FIG. 17, since the distance between the objective lens system provided at the distal end portion 12 of the endoscope insertion portion 8 and the inner wall of the anus 88 is maintained, and the transparent tube 82 is transparent, The inner wall 88 of the anus can be observed through the transparent tube 82. In addition, by aligning the position of the cutout portion 84 with the lesion portion, the lesion portion is exposed, and various treatments such as hemostasis can be endoscopically performed.

The transparent tube 82 and the holding portion 83 may be integrated.

Next, a second embodiment of the insertion assisting tool which secures the field of view of the endoscope and facilitates observation and treatment of the anus by the endoscope will be described.

FIG. 18 is a block diagram showing the arrangement of an insertion assisting tool according to the second embodiment of the insertion assisting tool which secures the field of view of the endoscope and facilitates observation and treatment of the anus by the endoscope.

As shown in FIG. 18, in the sliding tube 81a for anus of the second embodiment, a transparent transparent tube 82 made of resin or the like and a holding portion 83 are connected, and a treatment is performed in the middle of the transparent tube 82. The treatment hole 91 is provided, and the projections and depressions 92 are provided on the holding portion 83 in the same direction as the treatment hole 91.
Is provided.

Before or at the same time as the insertion of the insertion portion 8 of the endoscope, the transparent tube 82 of the sliding tube 81a for anus is inserted into the anus. As a result, a certain distance is maintained between the transparent tube 82 and the objective lens at the tip of the endoscope, and the subject will not come too close. Since the tip of the transparent tube 82 to be inserted does not have a step due to the notch as in the first embodiment of the insertion assisting tool, the step is not caught on the inner wall 88 of the anus and the insertion is smoothly performed. Further, since the holding portion 83 is not inserted into the anus and is exposed to the outside of the body, the unevenness 92 provided on the holding portion 83 is in a position where it can be visually confirmed and points in the direction of the treatment hole 91.

Therefore, since the distance between the objective lens at the tip of the endoscope and the inner wall of the anus 88 is maintained and the transparent tube 82 is transparent, the inner wall of the anus 88 can be observed through the transparent tube 82. Compared to the first embodiment of the insertion aid,
Since the transparent tube 82 can be smoothly inserted without a step due to the cutout 84, there is no danger of the cutout being caught on the inner wall 88 of the anus and being damaged. In addition, by aligning the treatment hole 91 with the lesion position by endoscopic observation,
It becomes possible to endoscopically perform various treatments such as hemostasis. In addition, the unevenness 92 on the holding portion 83 outside the body
You can grasp the exact position of the lesion.

The mark on the holding portion may not be uneven and may be due to printing or a difference in shape.

[Additional Notes] (2-1) In the insertion aid for the lower digestive tract of the endoscope,
An insertion aid for the lower digestive tract of an endoscope, which has a transparent insertion portion into the body.

In the lower digestive tract insertion aid of the endoscope according to the additional item (2-1), the distance between the subject and the objective lens at the tip of the endoscope inserted into the lower digestive tract insertion aid is maintained. As a result, it is possible to secure the field of view of the endoscope and improve the observation performance.

(2-2) The insertion aid for the lower gastrointestinal tract of the endoscope according to item (2-1), wherein the length of the insertion portion is set to be about the length of the anal canal.

(2-3) The insertion aid for the lower gastrointestinal tract of the endoscope according to the additional item (2-1), wherein a notch is provided at the tip of the insertion portion.

In the insertion aid for the lower digestive tract of the endoscope according to the additional items (2-2) and (2-3), the objective and the objective of the endoscope tip inserted into the insertion aid for the lower digestive tract. By maintaining the distance from the lens and partially exposing the lesion or the like, it becomes possible to improve the procedural property.

(2-4) A treatment hole is provided at a position distant from the distal end of the insertion portion, and the additional item (2-
The insertion aid for the lower digestive tract of the endoscope according to 1).

In the insertion aid for the lower digestive tract of the endoscope according to the additional item (2-4), the effect of the additional item (2-1) can be obtained by smoothing the insertion of the auxiliary device by the treatment hole. In addition,
(2-5) A mark is provided on the insertion portion coaxially with the treatment hole on the insertion portion. (2-5) The additional item (2-1) described above. Insertion aid for the lower digestive tract of an endoscope.

In the insertion aid for the lower digestive tract of the endoscope according to the additional item (2-5), the provided mark points in the direction of the treatment hole, thereby achieving the effect of the additional item (2-1). In addition, it is possible to easily grasp the exact position of the lesion.

[0103]

As described above, according to the endoscope of the present invention, the length of the built-in object mounted in the insertion portion in the insertion portion longitudinal direction is the distal end portion when the bending portion is not curved. To the built-in object fixing portion, the built-in body at the time of maximum bending in the bending portion by the bending operation means when the distal end of the built-in object is fixed to the tip end and the base end of the built-in object is a free end. Since the base end of the object has a maximum length in addition to the length to be pulled into the insertion portion, there is an effect that when the bending portion is bent, the burden on the internal component in the insertion portion can be reduced. .

[Brief description of drawings]

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

2 is a longitudinal cross-sectional view of the tip of the endoscope of FIG. 1 including an imaging unit.

3 is a configuration diagram showing a detailed configuration of the nozzle of FIG.

FIG. 4 is an explanatory view illustrating the operation of the nozzle of FIG.

5 is a front view of the distal end surface of the insertion portion of the endoscope of FIG.

6 is a longitudinal sectional view of the image pickup unit of FIG.

7 is a longitudinal cross-sectional view of the distal end of the endoscope of FIG. 1 including a channel through which forceps is inserted.

FIG. 8 is a configuration diagram showing a configuration of a zoom ring and a helicoma which are zoom mechanisms of an endoscope according to a second embodiment of the present invention.

9 is a configuration diagram showing a configuration of a zoom ring and a helicoma of a first modified example of the zoom mechanism of FIG.

10 is a configuration diagram showing a configuration of a second modification of the zoom mechanism of FIG.

FIG. 11 is a first configuration diagram showing a zoom mechanism of a conventional endoscope.

FIG. 12 is a second configuration diagram showing a zoom mechanism of a conventional endoscope.

FIG. 13 is a third configuration diagram showing a zoom mechanism of a conventional endoscope.

FIG. 14 is a longitudinal cross-sectional view of a distal end of an endoscope including a channel for inserting forceps according to a conventional example.

FIG. 15 is an explanatory view for explaining the influence of the bending operation of the bending portion of the channel of FIG.

FIG. 16 is a configuration diagram showing the configuration of the insertion assisting tool according to the first embodiment of the insertion assisting tool that secures the field of view of the endoscope and facilitates observation and treatment of the anus by the endoscope.

FIG. 17 is an explanatory view explaining the operation of the insertion assisting tool of FIG. 16.

FIG. 18 is a configuration diagram showing a configuration of an insertion assisting tool according to a second embodiment of the insertion assisting tool that secures the field of view of the endoscope and facilitates observation and treatment of the anus by the endoscope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Endoscope 2 ... Light source device 2a ... Connector receiving 2b ... Light source lamp 2c ... Condensing lens 3 ... Video processor 4 ... Monitor 5 ... VTR deck 6 ... Video printer 7 ... Video disk 8 ... Insertion section 9 ... Operation section 9a ... operation switch 9b ... bending operation knob 10a ... connector 10b ... signal code 11 ... bending part 11a ... bending piece 12 ... tip part 13 ... universal code 13a ... connector device 14 ... light guide 15 ... illumination through hole 16 ... light distribution lens 17a ... Forceps through hole 17b ... Insertion hole 18 ... Observation through hole 18a ... First lens frame 18b ... Cover lens 19 ... Air / water feeding nozzle 20 ... Air / water feeding tube 21 ... Air / water feeding pipe 22 ... Air / water feeding Water conduit 23 ... Nozzle mounting cylinder 24, 30 ... Adhesive 25 ... Second lens frame 26 ... Insulating member 27 ... Objective lens system 28 Imaging unit 29 ... Solid-state imaging device 29a ... Element frame 29b ... Lead wire 31 ... Elastic coating material 32 ... Shield frame 32a ... Insulation cover 33 ... Rotating substrate 34 ... Transistor 35 ... IC 36 ... Capacitor 37 ... Cable 37a ... Internal conductor 38 ... Signal cable 39 ... Cable fixing member 40 ... Tube 45 ... Channel 46 ... Forceps 47 ... Wire 48 ... Wire receiving 49 ... Tangent line 50 ... Stomach wall

Claims (1)

[Claims] 1. A main body is composed of an insertion portion formed by connecting a tip portion to a tip portion, a bending portion, and a flexible tube in this order, and an operation portion having bending operation means for bending the bending portion. An endoscope having a built-in object mounted in a portion, a tip fixed to the tip portion, and a base end fixed to a built-in object fixing portion provided on the base end side of the main body, The length of the insertion portion in the longitudinal direction is the length from the tip portion to the built-in object fixing portion in a state where the bending portion is not bent, and the tip of the built-in object is fixed to the tip portion to form a base of the built-in object. The maximum length is the sum of the length by which the proximal end of the built-in object at the time of maximum bending is drawn into the bending portion by the bending operation means when the end is a free end. Endoscope.