JP3510343B2 - Electronic endoscope - Google Patents

Electronic endoscope

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Publication number
JP3510343B2
JP3510343B2 JP19882294A JP19882294A JP3510343B2 JP 3510343 B2 JP3510343 B2 JP 3510343B2 JP 19882294 A JP19882294 A JP 19882294A JP 19882294 A JP19882294 A JP 19882294A JP 3510343 B2 JP3510343 B2 JP 3510343B2
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Japan
Prior art keywords
bending
endoscope
cable
signal cable
tip
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP19882294A
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Japanese (ja)
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JPH0856896A (en
Inventor
好幸 谷井
Original Assignee
オリンパス株式会社
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Priority to JP19882294A priority Critical patent/JP3510343B2/en
Publication of JPH0856896A publication Critical patent/JPH0856896A/en
Application granted granted Critical
Publication of JP3510343B2 publication Critical patent/JP3510343B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an electronic endoscope having a solid-state image pickup device in an insertion portion and transmitting an electric signal output from the image pickup device through a signal cable.

[0002]

2. Description of the Related Art In recent years, by inserting an elongated insertion portion into a body cavity, the organ in the body cavity can be observed and, if necessary,
2. Description of the Related Art Endoscopes that can perform various therapeutic treatments using a treatment instrument inserted in a treatment instrument channel are widely used.

Such an endoscope generally has a mechanism for bending the bending portion on the distal end side of the insertion portion, and cleans the dirt of the objective optical system on the distal end surface, so that air / water can be sent from the nozzle. ing. At the time of insertion, an optical fiber endoscope has been conventionally used as a type of endoscope to be inserted into the body cavity while holding the mouthpiece in the patient, but in recent years, the Coupling device (CCD)
Electronic endoscopes using such solid-state image pickup devices as image pickup means have been widely used.

The above-described bending portion bends the tip end side of the insertion portion freely in the up, down, left, and right directions to enhance the sniper property to the inspected portion and facilitate observation of the target portion.

Such a curved portion is disclosed, for example, in Japanese Patent Laid-Open No. 3-1.
As disclosed in Japanese Unexamined Patent Publication No. 46022, a large number of bending pieces formed in a short tubular shape are arranged in the axial direction of the insertion portion, and connecting pieces of the bending pieces are pivotally attached to each other by connecting pins, so that the bending pieces can be vertically and horizontally oriented. It is configured to bend. The outer circumference of each of the plurality of rotatably connected bending pieces is covered with an exterior member such as a blade or an outer skin.

The diameter of the head of the connecting pin is smaller than the diameter of the connecting piece of the bending piece. Also, the head of the connecting pin is composed of a horizontal surface and an inclined part, but since the head diameter is small,
The diameter of the horizontal surface also becomes smaller. On the other hand, the bending operation wire is
When the bending operation wire is bent because it is in contact with the head of the connecting pin, the bending operation wire may be pulled, and may slide down from the horizontal surface portion of the connecting pin to the inclined portion, causing a phenomenon in which sharp bending occurs, that is, a so-called bending jump. The operator needs to always smoothly bend without causing such a curved jump.

Next, as a problem when the endoscope is used, when the endoscope is inserted into a body cavity or the like, mucus or the like is exposed on the lens surface exposed to the outside of the objective lens system provided at the tip of the endoscope. May adhere to the lens surface and stain the lens surface. In such a case, the nozzle or the like fixed to the tip is used to supply air or water to remove the air.

Conventionally, various endoscopes having a nozzle capable of cleaning such an objective optical system have been proposed. For example, Japanese Patent Application Laid-Open No. 2-185225 discloses an endoscope having a nozzle in which a pipe is bent.

In the conventional endoscope with a nozzle, when the nozzle is fixed to the tip, an adhesive or the like is filled in a space between the tip and the nozzle to prevent dirt and the like from entering.

However, the adhesive is exposed on the outer surface, and the adhesive is higher than the apex of the nozzle by projecting from the end face of the tip and the adhesive is convex on the end face of the tip and the root of the nozzle. It is painted on.

Therefore, water drops collect on the surface of the adhesive,
The water was not drained well, and the illumination light from the light guide was reflected by the water droplets, causing flare.

[0012] Therefore, it is another object to provide an endoscope having a nozzle that has a good drainage property and does not cause flare.

This is not limited to the fiber type optical endoscope, and particularly for flare, it is necessary to take countermeasures in the electronic endoscope.

This electronic endoscope has advantages such as higher resolution than a fiberscope, easy recording and reproducing of images, and easy image processing such as image enlargement and comparison of two screens. have.

The solid-state image pickup device is disclosed in, for example, Japanese Patent Laid-Open No. 63-
As disclosed in Japanese Patent No. 43639, it is fixed at an image forming position by an objective lens, and an optical image of an observed region formed by the objective lens is photoelectrically converted by the solid-state image pickup device and is formed on a circuit board. It is configured to be amplified by the amplifier circuit provided.

Then, the amplified signal is input to the video signal processing circuit in the video processor through a signal cable connected to the circuit board and inserted through the insertion portion, and the video signal is processed by the processing circuit to generate an image. After being converted into a signal, it is output to the TV monitor. Such a configuration is a general configuration of an endoscope apparatus having an electronic endoscope, and the output of the solid-state image sensor is displayed on a television monitor so that it can be observed as an image of the observed region. Has become.

[0017]

However, the circuit board and the signal cable are disclosed in, for example, JP-A-2-29.
As disclosed in Japanese Patent No. 9629 and Japanese Patent Application Laid-Open No. 63-43639, the board side of the signal cable is soldered and then filled with an adhesive. When the end portion of the adhesive becomes the hard portion end of the image pickup unit and the bending portion of the electronic endoscope is bent in the up direction, for example, the signal cable also bends along the curved shape of the bending portion. At this time, since the signal cable and the like are fixed at the tip portion, the signal cable is sharply bent at the end of the hard portion.

Since the endoscope is frequently bent during inspection, bending stress is intensively applied to the end of the hard portion, and the signal cable is often disconnected at the end of the hard portion, and some measure is required.

Further, not only when the cable is bent, but also when the cable is twisted, bending stress is applied to the cable, which is concentrated on the adhesive end at the base of the cable, causing the cable to break.

On the other hand, in the one disclosed in Japanese Patent Laid-Open No. 63-290541, a cable protection tube is attached to the signal cable in order to protect it from being pressed by another built-in object or a wire receiver for inserting a wire for bending. It is provided. Even with this configuration, the protective tube cannot prevent the breakage, and the signal cable may be broken at the end of the hard portion.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide an electronic endoscope in which the signal cable is not broken at the end of the rigid portion without increasing the length of the rigid portion of the image pickup unit. Has an aim.

[0022]

According to the electronic endoscope of the present invention, an insertion portion having a distal end portion and a curved portion connected to the distal end portion, a solid-state imaging device provided at the distal end portion, and the solid-state imaging device are provided. An image pickup unit having an electronic circuit connected to the signal line, a signal cable connected to the image pickup unit and inserted through the insertion section, at least a part of the signal cable, and a connection section between the electronic circuit and the signal cable. Of the cable protection covering member that covers the
At least a part, and the electronic circuit and the signal cable
By covering the connection part with and by the cable protection covering member
Than flexibility in the area of the signal cable covered
It has low flexibility, and its proximal side is the cable protective coating.
An elastic covering member that is shorter than the base end of the member is provided, and the elastic covering member is provided with the cable protection member.
It is characterized by having flexibility equal to or lower than that of the covering member .

[0023]

[0024]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 14 relate to a first embodiment of the present invention. FIG. 1 is a schematic configuration diagram of an endoscope system, FIG. 2 is a side sectional view of a distal end portion of the endoscope, and FIG. 3 is an endoscope including an imaging unit. FIG. 4 is a side view of the imaging unit, FIG. 5 is an explanatory view of a curved state of the signal cable, FIG. 6A is a perspective view of the mouthpiece, and FIG. Figure, Figure 7
7A is a vertical sectional view of the mouthpiece, FIG. 7B is a horizontal sectional view of the mouthpiece, FIG. 8 is a perspective view of the horseshoe-shaped mouthpiece, and FIG. 9A is a mouse having a configuration different from that of FIG. 7B. FIG. 9B is a horizontal sectional view of the piece, FIG. 9B is a side view of a mouthpiece having a different configuration from FIG. 6B, and FIG.
10 is a horizontal sectional view of a mouthpiece having a different configuration from FIG.
10A is a horizontal sectional view of a mouthpiece having a different configuration from FIG. 10A, FIG. 11 is a detailed partial vertical sectional view of a bending piece, FIG.
Is a vertical cross-sectional view of a curved portion, FIG. 13 is a vertical cross-sectional view showing details of a nozzle and its surroundings, and FIG. 14 is a front view of a distal end surface of an insertion portion.

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

The endoscope 1 has, for example, an elongated and flexible insertion portion 8 that can be inserted into a body cavity, and a large-diameter operation portion that is connected to the proximal end side of the insertion portion 8. 9 and 9. Further, a distal end portion 12 is provided on the distal end side of the insertion portion 8 via a bending portion 11 composed of a plurality of bending pieces 11a shown in FIG. By bending the bending portion with a bending operation knob (not shown), the tip portion 12 can be directed to the observed region.

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 is connected to the connector receiver 2a to which the connector device 13a is connected. Is provided. A signal cord 45b provided with a connector 45a at its tip is extended to the connector device 13a.
The output of the solid-state image sensor of the endoscope 1 described later is supplied to the video processor 3 via 5a.

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 introduced into the universal cord 13. It can be guided toward the endoscope 1 through a light guide (not shown) provided.

This light guide is connected to another pair of light guides 14 arranged in the insertion portion 8 and extends to the tip portion 12.

An illumination through hole 15 is formed in the deflected portion of the tip portion 12, and the illumination light from the light source device 2 is fixed to the illumination through hole 15 by a light distribution lens 16.
The region to be observed is irradiated via the.

Further, a forceps through hole 19 shown in FIG. 14 is formed in a portion of the tip portion 12 which is deflected to the outer peripheral side.
The forceps through hole communicates with a forceps insertion opening 17b formed in the operation portion 9 through a forceps channel (not shown) provided in the insertion portion 8, and the insertion opening 17b is formed.
The forceps inserted in the above is projected from the tip portion 12 through the forceps through hole 19.

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 observation site of the observation site is formed through this observation through hole 18. Observations are being made. At the same time, the tip portion 12 is provided with a nozzle 21 for supplying air and water, which is directed toward the cover lens 18b, and the nozzle 21 is operated by operating an operation switch 9a provided in the operating portion 9. Air and water are supplied to the cover lens 18b via the cover lens 18b to remove fogging and the like on the surface of the cover lens 18b.

The observation through hole 18 is formed at a portion facing the forceps through hole 19 with the central axis of the tip portion 12 interposed therebetween.

The lens frame 18a is fixed to the observation through hole 18 with a fixing screw 24, and an O-ring 23 is interposed between the observation through hole 18 and the first lens frame 18a. , The O-ring 2 has a liquid-tight state in the observation through hole 18.
Holds at 3.

A second lens frame 25 is fixed to the opposite side of the first lens frame 18a from the cover lens 18b via an insulating member 26. In the second lens frame 25, the axis of the observation through hole 18 and the cover lens 1
An objective lens system 27 including a plurality of lens groups having an optical axis that matches the optical axis of 8b is provided. With
An element frame 28 is fixedly attached to the second lens frame 25 on the outer periphery opposite to the first lens frame 18a. The element frame 28 extends rearward of the second lens frame 25, and a solid-state image pickup element 29 constituting an image pickup unit is provided at the extended portion of the objective lens system 27 in the extended portion as shown in FIG. For example, an epoxy adhesive 30 orthogonal to the optical axis
It is fixed in.

On the outer circumference of the element frame 28 on the base end side, a tip end portion of a shield frame 32 formed in a cylindrical shape and covered with an insulating cover 32a made of, for example, vinyl chloride,
It is fixed. 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 29a of the solid-state image sensor 29 are connected.

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, FE on the outer circumference.
A cable outer cover 38c formed of P or the like is covered. Further, the outside of the signal cable 38 is covered with a cable protection tube 40 formed of, for example, EPTFE.
The front end side of is abutted against the cable fixing member 39 and is fixed by, for example, an epoxy adhesive.
It should be noted that a thread may be wound from the outside to be adhesively fixed.

On the other hand, the cable protection tube 40 is formed so that the base end side thereof has a length exceeding the bending portion 11, and even if the bending portion 11 is bent and the cable protection tube 40 is pulled into the bending portion, the cable The protective tube 40 has a sufficient length so that the proximal end of the protective tube 40 is not located in the curved portion.

An epoxy adhesive 41, for example, is provided between the shield frame 32, the cable 37 and the insulating cover 32a.
Are filled, and the signal cable 38 is more firmly fixed.

The outer circumference of the insulating cover 32a is covered with an elastic coating material 42 formed of, for example, a heat shrinkable tube. The tip end side of the elastic covering material 42 is the shield frame 3
It is preferable that the length is shorter than 2, the base end side is longer than the insulating cover 32a, and shorter than the first bending piece 11a.

Incidentally, the first bending piece 11a and the second bending piece 11a
If the bending of the second bending piece 1 is within 10 °, for example, the second bending piece 1
The length may be increased to within 1a. Further, it is preferable that there is no clearance between the elastic coating material 42 and the cable protection tube 40, but there is no problem even if the insulation cover 32a has a thickness.

Further, in order to prevent the elastic covering material 42 from coming off, it may be adhered within the range of the shield frame 32.

In addition, as shown in FIG.
The protrusion 32b may be provided on part a or around the entire circumference of a so as to prevent it from coming off.

Although it has been described that the elastic covering material 42 uses a heat shrinkable tube, the elastic covering material 42 is not limited to this, and a rubber tube such as silicone rubber, fluorine rubber or natural rubber, FEP, PTFE (polyester). Tetrafluoroethylene) may be used. Further, the flexibility of the elastic covering material 42 is preferably 1.5 times or more lower than the flexibility of the portion of the signal cable 38 covered by the cable protection tube 40. The hardness may be set to any value as long as it is 5 times or more lower.

Next, a mouthpiece required for inserting the endoscope insertion portion into the body cavity will be described. When inserting the endoscope insertion part from the oral cavity into the esophagus, or through the esophagus into the body cavity such as the stomach, a mouthpiece is used so that the insertion part of the endoscope can be easily inserted into the body cavity. Has been.

Generally, the mouthpiece is merely used as a tool for preventing the insertion portion of the endoscope from being damaged by the teeth of the subject, and the endoscope is placed inside the body cavity of the subject. Little consideration was given to the insertability when inserting. That is, when the endoscope is inserted into the body cavity of the subject, the insertion portion becomes S-shaped inside the mouthpiece, and the insertion portion is caught at both ends of the insertion hole of the mouthpiece, and the surgeon makes an unintended movement. It often caused the patient distress. In addition, it is difficult for the surgeon to move the diseased part as he / she desires, so that it is difficult to view the diseased part from the front. Furthermore, in some cases, jelly or the like is attached to the insertion part to assist the insertion, but the hands have been bothered.

The mouthpiece described below is constructed to eliminate these points.

FIG. 6 (a) shows the mouthpiece body 47, which has the endoscope insertion hole 4
8 has a substantially cylindrical shape and has a relatively small flange 49 at the inner end and a relatively large flange 50 at the outer end. This mouthpiece body 47
Are integrally molded with synthetic resin such as modified PPO (polyferrin oxide).

FIG. 6 is a view of the center of the insertion hole 48 of the endoscope.
As shown in (b), the endoscope insertion assisting rollers 51a, 5
1b is detachably provided. Insertion auxiliary roller 51
The a and 51b are formed of synthetic resin such as modified PPO (polyferrin oxide).

The brim 50 at the outer end is filled with jelly replenishing holes 52a, 5 for insertion assistance for injecting jelly for assisting the insertion.
2b is provided. This insertion support jelly refill hole 52
As shown in FIG. 7A, the a and 52b are guided to the space insertion assisting jelly filling cavities 53a and 53b provided around the insertion assisting rollers 51a and 51b.

Further, the roller insertion hole 5 of the endoscope insertion auxiliary rollers 51a and 51b provided in the endoscope insertion hole 48.
Since 4a and 54b have the same shape, only one will be described. The roller insertion hole 54a is formed to be slightly larger than the insertion assisting roller. As shown in FIG. 7B, the insertion assisting roller 51a has arcuate notches 55a, 5 on the rotational direction side.
5b is provided.

On the other hand, the outer end side of the endoscope insertion hole 48 is shown in FIG.
As shown in (a), an inclined portion 48a is provided to facilitate insertion of the endoscope. Similarly, on the inner end side, the inclined portion 48
b is provided.

In the mouthpiece shown in FIGS. 6 and 7, the insertion assisting rollers 51a and 51b allow the insertion of the endoscope insertion portion to be smoothly inserted into the insertion hole 48 without causing pain to the patient. Further, in this mouthpiece, for example, an insertion assisting jelly can be filled into the filling chambers 53a and 53b from a fine tube or the like through the replenishment holes 52a and 52b, and the hands can be filled without getting dirty. And the insertability is also improved.

Next, a mouthpiece different from the configuration shown in FIGS. 6 and 7 will be described. For example, as shown in FIG. 8, the mouthpiece body 47A may have a horseshoe shape. This mouthpiece 47A has an endoscope insertion hole 48 between tooth receiving portions 56a and 56b formed in a concave shape on both upper and lower surfaces.
Is provided. As a result, the mouthpiece 47A is held in the oral cavity in a natural state for the patient.

Further, in the structure shown in FIG. 9A, instead of the cutouts 55a and 55c in the structure shown in FIG. 7B, a cutout 55c having an uneven shape is provided.

The mouthpiece 47 shown in FIG.
B is four insertion auxiliary rollers 51a, 51b, 51c,
By providing 51d, the endoscope can be inserted more smoothly.

In FIG. 10A, in place of the auxiliary rollers 51a and 51b in the configuration of FIG. 7B, an insertion auxiliary roller 51e having a concave central portion is provided.

Further, FIG. 10B shows a roller insertion port 54g.
Is oval, and the insertion assisting roller 51g is spherical. Two or four spherical insertion assisting rollers 51g may be provided on the inner surface of the endoscope insertion hole 48.

Next, the structure of the bending portion of the endoscope insertion portion will be described. The bending portion 11 of the endoscope 1 includes a plurality of bending pieces 1
1a are arranged in the axial direction of the insertion portion 8, and as shown in FIG.
Adjacent ones of the bending pieces 11a are rotatably connected to each other by connecting pins 59a and 59b. The connecting pins 59a and 59b are arranged so that the positions of the connecting pins 59a and 59b are interchanged vertically and horizontally so that they can be curved vertically and horizontally as a whole.

As shown in FIG. 2, the frontmost bending piece 11a is fitted and fixed to the tip end body 12a, and the bending piece 11a at the final end is the base end portion of the bending portion 11. It is fixed to the middle portion of the portion 8. Furthermore, this bending piece 1
1a is covered with a cylindrical blade 60 shown in FIG. 12 formed by braiding fine metal wires, and the outer peripheral surface of this blade 60 is
The flexible rubber tube 61 is watertightly coated, and also covers the rear end of the tip portion main body 12a. Also, the rubber tube 61
The rear end side of the insertion portion 8 is fitted to the midway portion.

The front end portion and the rear end portion of the rubber tube 61 are fixed by winding, for example, the thread 20 and then adhering with an epoxy adhesive, for example.

A wire guide 63 for inserting and guiding a bending operation wire 63 is provided above and below the inner surface of the bending piece 11a.
Is provided. Further, wire guides 63 that similarly insert and guide the bending operation wire 62 are provided at the left and right positions on the inner surface of the bending piece 11a that is different from the above. The bending pieces 11a provided with the wire guides 63 do not have to be specified, and it is sufficient if the bending pieces 11a are arranged at a predetermined interval and can guide the bending operation wire 63 along the inner surface of the bending piece 11a.

The tip of each bending operation wire 63 is fixed to the most distal bending piece 11a. The proximal end side of each bending operation wire 63 is connected to the bending operation drive mechanism (not shown) of the operation section 9 through the insertion section 8. The bending operation drive mechanism is operated by rotating a bending knob (not shown) to pull up and down or left and right bending operation wires 62.

The bending piece 11a is, as shown in FIG.
It has the connecting piece 11b, and the connecting piece 1 of each bending piece 11a.
1b are overlapped and connected by connecting pins 59a and 59b. The connecting pins 59a and 59b are prevented from coming off by caulking, for example.

The radius RA of the connecting piece 11b is smaller than the radius RB of the heads of the connecting pins 59a and 59b. The diameter of the heads of the connecting pins 59a and 59b is φC = 2 ×
RB> 2 × RA. Only the connecting pin 59b will be described below.

On the other hand, the head of the connecting pin 59b has a horizontal surface 5
9c and the inclined portion 59d, the diameter φC of the head of the connecting pin 59b is the connecting piece 11b of the bending piece 11a.
Since it is larger, the diameter φD of the horizontal plane portion 59c can be made relatively large.

Further, the endoscope 1 is provided with an air / water supply pipe 66 to which an air / water supply tube 65 provided inside the insertion portion 8 is connected. This air / water supply pipe 66
Communicates with the nozzle 21 provided on the tip end side via the air / water supply conduit 67. The nozzle 21 is fixed to a nozzle mounting cylinder 68 fixedly provided inside the tip body 12a, and the tip side is exposed from the tip end 12 of the endoscope. A silicone adhesive 69, for example, is applied to the space between the nozzle 21 and the tip cover 12c.

Here, as shown in FIG. 13, the distance between the highest point A of the nozzle 21 projecting from the tip cover 12c and the tip cover 12c is x, the nozzle 21 and the adhesive 69.
The distance y between the apex B of the boundary line and the tip cover 12c is y. The adhesive 69 is applied so that x> y. Further, when the point of the adhesive 69 facing the apex B of the boundary line of the tip cover 12c is C, the adhesive is applied so as to warp toward the center side of the nozzle 21 from the straight line connecting B and C. . This relationship is the same in the outer circumference of the nozzle 21 other than the opening.

In the above-described structure, when the bending knob (not shown) of the bending portion 11 of the electronic endoscope 1 is bent in the up direction, for example, the light guide 14, the signal cable 38, and the not-shown shape follow the curved shape of the bending portion 11. The forceps insertion / removal tube and the air / water supply tube 65 are bent.

Here, since the distal end side of the signal cable 38 inside the endoscope abuts on the elastic covering member 42, the signal cable 38 is prevented from being sharply bent at the hard end of the image pickup unit. Further, since the elastic covering material 42 is less flexible than the portion where the signal cable 38 is covered with the cable protection tube 40, the bending of the signal cable is restricted.
That is, as shown in FIG. 5, the curved radius is different, and the curved radius on the signal cable 38 side of the elastic covering material 42 is changed to R1.
If the curved radius of the portion of the signal cable 38 covered with the cable protection tube 40 is R2, then R1> R2.

Next, when the endoscope is inserted, for example, xylocaine jelly or the like is preliminarily injected through the jelly refilling holes 52a and 52b provided in the mouthpiece body 47,
The filling chambers 53a and 53b are filled with jelly.

Brim 4 provided on mouthpiece body 47
Insert the 9 side into the mouth of the patient, bite the central part and insert the endoscope.

When the endoscope is inserted with an endoscope, the inclined portion 48a is provided at the outer end of the endoscope insertion hole 48 so that it can be easily inserted. The tip of the insertion portion of the endoscope is an insertion assisting roller 51a,
When it hits 51b, the insertion assisting rollers 51a and 51b rotate, and an appropriate amount of jelly comes into contact with the surfaces of the insertion assisting rollers 51a and 51b from the notches 55a and 55b, so that an appropriate amount of jelly is attached to the insertion part, so that the insertion is extremely smooth. The endoscope can be moved back and forth.

Next, the operation of the bending portion will be described. When a bending knob (not shown) is rotated, the bending operation wire 62 is pulled and bent. At this time, as the bending angle increases, the bending operation wire 62 moves in a direction deviated from the center of the connecting pin 59a, as shown by the chain double-dashed line in FIG. Here, since the horizontal plane portions 59c of the heads of the connecting pins 59a and 59b are sufficiently large, the bending operation wire 6
No. 2 always moves on the horizontal plane portion 59c even if curved.

Further, the bending operation wire 6 which is not pulled
Although 2 is slack, it only moves on the horizontal plane portion 59c and does not fall into the inclined portion 59d. Therefore, for example, after the up curve is applied, the right curve or the left curve can be smoothly applied.

Further, there is a forceps channel tube (not shown) whose inner diameter is increased in order to facilitate treatment or treatment. In this case, the wire guide 63 on the down side or the light on the forceps channel tube side is used. ,
Alternatively, the left wire guide 63 must be shaken. Therefore, the bending operation wire 62 is connected to the connecting pin 59a,
Although it is separated from the center of 59b, even in this case, the bending operation wire 62 is always on the horizontal plane portion 59c and does not fall down to the inclined portion.

Next, the operation of the nozzle will be described. When the endoscope is used for surgery, for example, dirt or the like may adhere to the surface of the first lens 18b of the objective lens group, and a sufficient field of view may not be obtained. In such cases,
By operating the air supply and water supply buttons of the operation unit (not shown), cleaning water and cleaning air are sent from the nozzle 21, and the water flow,
The air flow removes dirt on the surface of the first lens 18b. At this time, the water discharged from the nozzle 21 becomes weaker when the water supply is stopped, and the water flows around the opening side surface or the back surface side of the nozzle 21, or the adhesive 69 is applied along the center side of the nozzle 21. Therefore, the water does not flow and the water drops do not remain around the nozzle 21.

Further, since no water droplets remain around the nozzle 21, the illumination light from the light guide (not shown) is not reflected, and the reflected light does not enter the first lens 8b, so that a good visual field is obtained. Can be maintained.

Although the electronic endoscope is used in the present embodiment, it can be widely used as a fiberscope and various other endoscopes. Further, the nozzle may have any shape as long as it has the same structure.

The effect of the first embodiment is that the signal cable 38
Since the distal end of the signal cable 38 is covered with the elastic coating material 42, the signal cable 38 does not bend sharply. At this time, the curved radius of the elastic covering material 42 is larger than the curved radius of the signal cable 38 side. Therefore, the bending stress due to the bending of the bending portion is dispersed over the entire length of the elastic covering material 42, so that the signal cable is not broken.

In the first embodiment, since the outer diameter is increased by the elastic covering material 42, the filling rate is increased by the increase in the outer diameter, and other built-in objects such as a light guide and forceps channel feed. Disturbances such as air supply tubes are reduced. Also,
When the arrangement of the tip portions is intentionally changed to the arrangement of the curved portions, the filling rate is high only in the elastic coating material portion, so that the arrangement can be stably performed. Moreover, since PTFE or the like having high flexibility is pushed by other built-in objects and is appropriately deformed, other built-in objects are stabilized with less disturbance.

If the mouthpiece described above is used,
When inserting the endoscope, the insertion assist roller is rotatable, so that the endoscope can be smoothly inserted. In addition, the operator can easily perform the inspection and the inspection time can be shortened. Also, since the insertion at the mouth is smooth, the patient can be easily inspected and pain is reduced.

Further, when the operation knob provided in the endoscope having the above-described bending portion is rotated to perform the bending operation, the radius of the head of the connecting pin is the radius of the tongue piece of the bending piece forming the bending portion. Since it is larger, the radius of the horizontal surface of the head of the connecting pin also becomes larger. On the other hand, when the bending operation wire is bent, it shifts from the center of the connecting pin, but since it has a large horizontal surface portion, it does not fall down to the inclined portion.

Therefore, the phenomenon of sharply curving, so-called curving skip, disappears.

In addition, there is a device in which a forceps channel tube having a large inner diameter is built in for facilitating treatment or treatment. In this case, two wire guides surrounding the forceps channel tube are swung on the opposite side to the forceps channel tube. However, in this case, the bending operation wire is not displaced from the center of the connecting pin or the bending operation wire is not displaced from the horizontal surface portion of the connecting pin to the inclined portion.

Further, when the observation window is cleaned by air supply or water supply, the apex of the adhesive is made lower than the apex of the nozzle and the adhesive is applied along the center side of the nozzle, so that water droplets are formed around the nozzle. There is no residue and the water drainage is improved.
Since no water droplets remain around the nozzle, the reflected light of the illumination light from the light guide disappears due to the water droplets, and the reflected light does not enter the objective lens, so flare does not occur.

FIG. 15 is a detailed side sectional view of the distal end portion including the image pickup unit according to the second embodiment of the present invention.

In this embodiment, in the structure of the first embodiment,
In addition to removing the elastic covering material 42, a bending stop member 43 as an elastic covering material is provided between the cable protection tube 40 and the insulating cover 32a. Other configurations and operations similar to those of the first embodiment are designated by the same reference numerals, description thereof will be omitted, and only different points will be described.

In this embodiment, a cable protection tube 40 made of, for example, PTFE or the like is coated on the outside of the signal cable 38, and a folding member 43 made of, for example, PTFE or the like is further coated. The inner diameter of the folding member 43 is preferably smaller than the outer diameter of the cable protection tube 40, but may be larger.

The tip side of the cable protection tube 40 is butted against the cable fixing member 39.
The tip side of the folding member 43 is also abutted similarly.
The rear end side of the folding member 43 extends rearward from the connecting portion between the circuit board 33 and the signal cable 38. For example, the rear end side of the folding member 43 is preferably longer than the insulating cover 32a and shorter than the first bending piece 11a.

In the present embodiment, the cable protection tube 40 and the break-preventing member 43 are wound with the thread 46 at the same time and adhered and fixed, but they may be separately wound with different threads and adhered and fixed.

The flexibility of the folding member 43 may be equal to or lower than that of the cable protection tube 40, and preferably 1.5 times or more lower. This folding member 43
May be of the same material as or different from that of the cable protection tube 40, for example, any flexible tube such as PTFE (polytetrafluoroethylene), rubber, or a heat shrinkable tube.

A space between the signal cable 38 and the cable protection tube 40 is filled with an elastic adhesive 44 such as silicone.

In the second embodiment, since the cable protection tube 40 and the fixing member 43 are fixed at the same time, the fixing member 43 does not come out.

In this embodiment, the adhesive 4 having elasticity is provided between the cable protection tube 40 and the signal cable 38.
By filling with 4, the twisting stress due to rotation curvature from up to light, etc.
Since the stress can be dispersed over the entire length of the cable protection tube 40, the signal cable 35 becomes more difficult to break. In this embodiment, the same effect can be obtained even if the clearance between the signal cable 38 and the cable protection tube 40 is eliminated.

The rest of the configuration, operation and effect are the same as those of the first embodiment, and the explanation is omitted.

FIG. 16 is a detailed side sectional view of the tip portion including the image pickup unit according to the third embodiment of the present invention.

In this embodiment, in the structure of the first embodiment,
In addition to removing the elastic covering material 42, a bending stop member 45 as an elastic covering material is provided between the cable protection tube 40 and the signal cable 38. Other configurations and operations similar to those of the first embodiment are designated by the same reference numerals, description thereof will be omitted, and only different points will be described.

As shown in FIG. 16, the signal cable 3
Outside of 8, the folding member 4 made of, for example, a heat-shrinkable tube
5 is covered, and a cable protection tube 40 made of, for example, PTFE is further covered on the outside. The tip side of the folding member 45 is abutted against the cable fixing member 39. The base end side of the folding member 45 is formed longer than the insulating cover 32a. For example, the base end side of the folding member 45 is preferably longer than the insulating cover 32a and shorter than the first bending piece 11a. The cable protection tube 40 is also butted against.

In this embodiment, the folding member 45 and the cable protection tube 43 are wound around the thread 46 at the same time to be adhesively fixed. The folding member 45 is used for the cable protection tube 4
The same material as 0 or a different material, for example, any tube having flexibility such as PTFE (polytetrafluoroethylene), rubber, or a heat shrinkable tube may be used.

In the third embodiment, since the adhesive 41 is filled between the signal cable 38 and the circuit board 33,
The folding stop member 45 can be more firmly fixed. Further, since the folding member 45 is securely fixed so as to come into close contact with the cable outer skin 38c of the signal cable 38, the general shield member 38a, and the outside of the cable 37, the resistance of the connection end of the signal cable 38 is also improved.

The rest of the configuration, functions and effects are the same as those of the first embodiment, and the explanation is omitted.

[Additional Notes] As described in detail above, according to the embodiment of the present invention, the following configuration can be obtained.
That is, (1) an image pickup unit including an insertion section, a solid-state image pickup device provided at the tip of the insertion section, and an electronic circuit connected to the solid-state image pickup element; and a insertion unit connected to the image pickup unit and inserted through the insertion section. Signal cable, and an elastic covering material having flexibility lower than that of the signal cable and at least covering the connection portion of the electronic circuit and the signal cable and the vicinity of the connection portion on the signal cable side. Have an electronic endoscope.

(2) The electronic endoscope according to appendix 1, wherein the elastic coating material covers the image pickup unit and the signal cable from the connection end to the base end side.

(3) The electronic endoscope according to appendix 1, wherein the elastic coating material is short.

(4) The electronic endoscope according to appendix 1, wherein the elastic coating material is arranged so as to cover the outer periphery of the image pickup unit.

(5) A cable protective covering member is provided for covering the signal cable from the vicinity of the connection end of the image pickup unit and the signal cable to the base end side, and the elastic covering material has the base end portion of the cable. The electronic endoscope according to appendix 1, which is shorter than the base end portion of the protective covering member.

(6) The electronic endoscope according to appendix 5, wherein the elastic coating material is arranged between the cable protection coating member and the signal cable.

(7) The elastic covering material is arranged so as to cover the outer periphery of the cable protection covering member.
The electronic endoscope described in.

(8) The insertion portion is provided with a bendable bending portion at the proximal end of the distal end portion having the image pickup unit, and the elastic covering material is provided with a large number of rotatable portions provided in the bending portion. The electronic endoscope according to appendix 1, which is formed to have a length that does not exceed the most advanced bending piece among the various bending pieces.

(9) The electronic endoscope according to appendix 1, wherein the elastic covering material is arranged so as to cover a protrusion provided on at least a part of the outer periphery of the image pickup unit.

(10) An endoscope mouthpiece having at least a part inserted into an oral cavity, held and held by upper and lower teeth, and having an endoscope insertion opening into which an endoscope is inserted, An endoscope mouthpiece having at least one rotatable insertion assisting roller provided in the endoscope insertion hole.

(11) The endoscope mouthpiece according to appendix 10, wherein two insertion assisting rollers are provided so as to face each other in the endoscope insertion hole.

(12) The endoscope mouthpiece according to appendix 10, wherein four insertion assisting rollers are provided in the endoscope insertion hole so as to face each two.

(13) The endoscope mouthpiece according to appendix 10, wherein the insertion assisting roller is formed in a spherical shape.

(14) A filling chamber that is partially open toward the insertion assisting roller is provided, and a replenishing hole that communicates with the filling chamber and is opened on the outer wall of the mouthpiece to be filled with the insertion assisting jelly is provided. The endoscopic mouthpiece according to appendix 10, which is provided.

(15) A horseshoe-shaped endoscope mouthpiece which has an endoscope insertion opening into which an endoscope is inserted and which is inserted into the oral cavity and held by being bitten and held by upper and lower teeth.

(16) The insertion portion has a bending portion, and the bending portion has a plurality of bending pieces pivotally attached to the connecting piece by connecting pins. In the endoscope in which the bending operation wire is pushed and pulled by the operating means to bend the bending portion to a desired angle, the radius of the head of the connecting pin is smaller than the radius of the connecting piece.

In the endoscope described in appendix 16, a plurality of bending pieces are bent at a desired angle by operating the operating means. Here, since the radius of the head of the connecting pin is made larger than the radius of the connecting piece provided on the bending piece, the horizontal plane portion of the head of the connecting pin can also be made larger than the connecting piece, so that the bending operation wire does not bend. Therefore, even if it is pulled, it can always move on the horizontal plane portion, so that the bending operation wire does not shift and fall from the inclined portion located outside the horizontal portion at the head of the connecting pin.

(17) An objective optical system, a part of which is exposed, is arranged at the tip of the insertion portion of the endoscope, and a nozzle that forms at least one of air or water is projected toward the objective optical system. In the endoscope, the adhesion range of the adhesive for fixing the nozzle is kept lower than the apex of the nozzle protruding from the surface of the tip part, and the end of the adhesion range kept lower than the apex and the base side of the nozzle are suppressed. An endoscope in which an adhesive is applied to the inside of a straight line connecting the end of the adhesion area on the front surface side of the tip.

(18) The endoscope according to appendix 17, wherein the adhesive is applied in a concave shape which is the inner side of the straight line.

[0123]

As described above, according to the electronic endoscope of the present invention, it is possible to prevent disconnection of the signal cable at the end of the hard portion of the image pickup unit without increasing the length of the hard portion. effective.

[Brief description of drawings]

FIG. 1 to FIG. 5 relate to a first embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of an endoscope system.

FIG. 2 is a side sectional view of a distal end portion of an endoscope.

FIG. 3 is a detailed side sectional view of the tip of an endoscope including an imaging unit.

FIG. 4 is a side view of the image pickup unit.

FIG. 5 is an explanatory diagram of a curved state of the signal cable.

6 (a) is a perspective view of a mouthpiece, FIG.
(B) is a side view of the trout piece.

7 (a) is a vertical sectional view of the mouthpiece, FIG.
(B) is a horizontal sectional view of the mouthpiece.

FIG. 8 is a perspective view of a horseshoe-shaped mouthpiece.

9 (a) is a horizontal sectional view of a mouthpiece having a different structure from that of FIG. 7 (b), and FIG. 9 (b) is a side view of a mouthpiece having a different structure from FIG. 6 (b).

10 (a) is a horizontal sectional view of a mouthpiece having a different configuration from FIG. 7 (b), and FIG. 10 (a) is FIG. 10 (a).
Sectional view of a mouthpiece having a different configuration from the above.

FIG. 11 is a detailed partial vertical cross-sectional view of a bending piece.

FIG. 12 is a vertical cross-sectional view of a curved bending portion.

FIG. 13 is a vertical cross-sectional view showing details of a nozzle and its periphery.

FIG. 14 is a front view of the distal end surface of the insertion portion.

FIG. 15 is a detailed side sectional view of a distal end portion including an image pickup unit according to the second embodiment of the present invention.

FIG. 16 is a detailed side sectional view of a distal end portion including an imaging unit according to the third embodiment of the present invention.

[Explanation of symbols]

1 ... Endoscope 29 ... Solid-state image sensor 33 ... Circuit board 37 ... Cable 38 ... Signal cable 39 ... Fixing member 40 ... Cable protection tube 42 ... Elastic coating material

Claims (2)

(57) [Claims]
1. An insertion portion having a tip portion and a curved portion connected to the tip portion, an imaging unit having a solid-state image sensor provided at the tip portion and an electronic circuit connected to the solid-state image sensor, A signal cable connected to the imaging unit and inserted through the insertion portion, a cable protection covering member that covers at least a part of the signal cable, and a connection portion between the electronic circuit and the signal cable, and at least the signal cable. Part, and the electronic circuit
Cover the connection between the cable and
In the part of the signal cable covered by the protective covering member
Has a lower flexibility than that in
An electronic endoscope comprising: an elastic covering member that is shorter than a base end portion of the cable protection covering member .
2. The elastic cover member protects the cable.
Characterized by having flexibility equal to or lower than that of the covering member
The electronic endoscope according to claim 1 .
JP19882294A 1994-08-23 1994-08-23 Electronic endoscope Expired - Fee Related JP3510343B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19882294A JP3510343B2 (en) 1994-08-23 1994-08-23 Electronic endoscope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19882294A JP3510343B2 (en) 1994-08-23 1994-08-23 Electronic endoscope

Publications (2)

Publication Number Publication Date
JPH0856896A JPH0856896A (en) 1996-03-05
JP3510343B2 true JP3510343B2 (en) 2004-03-29

Family

ID=16397497

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19882294A Expired - Fee Related JP3510343B2 (en) 1994-08-23 1994-08-23 Electronic endoscope

Country Status (1)

Country Link
JP (1) JP3510343B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10211165A (en) * 1997-01-28 1998-08-11 Asahi Optical Co Ltd Tip part for electronic endoscope
JP3333180B2 (en) 2000-03-30 2002-10-07 和子 川口 Equipment for removing crown restorations, etc.
JP5782291B2 (en) * 2011-04-28 2015-09-24 株式会社トップ Endoscope mouthpiece
JP2015119998A (en) * 2015-02-05 2015-07-02 株式会社トップ Mouthpiece for endoscope
JP6327624B2 (en) * 2015-02-24 2018-05-23 国立大学法人鳥取大学 Mouthpiece
WO2019131328A1 (en) * 2017-12-28 2019-07-04 アイリス株式会社 Oral photographing auxiliary tool, and medical apparatus including oral photographing auxiliary tool

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