JPH10201701A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a washing nozzle insulated from the top end body without interfering washing capability for the inside of a duct and reduce the outer diameter of the top end of the endoscope. SOLUTION: The top end of inserting part of an endoscope is engagedly covered with an insulating cover 54 at a top end body 50. The insulating cover 54 comprises a through hole 58 for installing an air and water supplying nozzle 15 in approximately parallel to the axis direction of the inserting part and the top end body 50 comprises a through hole 65 in the direction having an angle to the axis of the air and water supply nozzle 15. At the edge side of the through hole 64, a tapered hole 66 being coaxial to the air and water supply nozzle 15 and reducing the diameter towards the hand side and having the inner diameter at the top end 56 larger than the inner diameter of the through hole 58 at the hand side end 57 of the insulating cover 54 is installed. The step part generated by the difference in the inner diameter between the through hole 58 and the tapered hole 66 is filled with an adhesive 81 to form a resin layer and the through hole 58 communicates to the taper hole 66 without step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope having an insulating cover at a distal end of an elongated insertion portion to be inserted into a test site.

[0002]

2. Description of the Related Art Conventionally, endoscopes have been widely used in the medical field and the like, and are capable of observing a target site such as a body cavity and performing various treatments. The endoscope used when performing various medical treatments in the medical field has a distal end cover that is electrically insulated from the distal end main body at the distal end of the insertion section so as not to cause burns in the body cavity when performing high frequency treatment. Is provided.

An endoscope having such a tip cover is disclosed in Japanese Patent Application Laid-Open No. Hei 8-173369. FIG. 15 shows the configuration of this conventional example. A distal end cover 2 covering the distal end body 204 is provided at the distal end of the insertion portion.
01 is provided. The front end cover 201 is provided with a nozzle through hole 203 into which the objective cleaning nozzle 202 is fitted, and the front end main body 204 is connected to a connecting pipe 206 to which an air supply or water supply fluid tube (not shown) is connected.
Is provided substantially coaxially with the nozzle through-hole 203. Nozzle through hole 20
The inner diameter of 3 is larger than the inner diameter of the pipe through hole 207.

[0004] The connecting pipe 206 has a through hole 2 for a pipe with the tip cover 201 attached to the tip body 204.
07, the connection pipe 206 is inserted from the operation section side and fitted, and the pipe end face 210 is projected into the nozzle through hole 203 from the end cover side end face 209 of the tip end main body 204 and fixed by soldering. Here, since the inner diameter of the nozzle through-hole 203 is larger than the outer diameter of the connection pipe 206, the connection pipe 206 is not double-fitted into the pipe through-hole 207 and the nozzle through-hole 203. However, since a gap 205 is formed between the nozzle through hole 203 and the pipe end surface 210 of the connection pipe 206, an adhesive 208 such as an epoxy-based adhesive is hermetically sealed in the gap 205 so that dirt and the like do not accumulate therein. To maintain good washing performance in the pipeline.

[0005]

In the conventional structure as described above, the connecting pipe 206 penetrates the tip main body 204, and the nozzle through-hole 203 and the pipe through-hole 207 are substantially coaxial. Connection pipe 206
The arrangement of the distal end main body 204 at the proximal end is substantially the same as the arrangement of the objective cleaning nozzle 202 on the distal end cover 201. The position of the objective cleaning nozzle 202 on the distal end cover 201 is set relative to the objective lens so as to obtain a cleaning effect of the objective lens provided at the distal end of the endoscope and not to obstruct the visual field of the objective lens. Since the positional relationship is determined, they can be arranged only within a certain range. Therefore, since the connection pipe 206 penetrates to the proximal end of the distal end main body 204 at a position corresponding to the objective cleaning nozzle 202, the connection pipe 206 is located at the proximal end of the distal end main body 204.
Cannot be freely arranged in consideration of interference with other built-in components not shown.

Here, in order to reduce the patient's pain during endoscopy and obtain good insertion performance, even if the outer diameter of the insertion portion is to be reduced, the distal end portion is restricted by the restriction on the arrangement of the objective cleaning nozzle 202. Interference between the connection pipe 206 and other internal components at the proximal end of the main body 204 is conceivable. As a result, the outer diameter of the distal end cover 201 must be increased, and the outer diameter of the insertion portion becomes larger. As a result, there is a problem that the diameter of the distal end portion of the endoscope cannot be reduced so much.

SUMMARY OF THE INVENTION The present invention has been made in view of these circumstances, and provides a cleaning nozzle insulated from a main body of a distal end without impairing the cleaning performance in a conduit, and has an outer diameter of a distal end of an endoscope. It is an object of the present invention to provide an endoscope that can reduce the diameter of a patient, reduce pain of a patient, and obtain good insertability.

[0008]

An endoscope according to the present invention comprises:
A first through-hole provided in an insulating cover for electrically insulating and covering the distal end body constituting the distal end of the insertion portion, and a second through-hole provided in the distal end body so as to communicate with the first through-hole.
An endoscope having a through-hole, a conduit formed by communicating the first and second through-holes, and an operation unit connected to the insertion unit. A resin layer is formed on a step caused by a difference in inner diameter at a position where the second through holes are connected.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 11 show the first embodiment of the present invention.
1 is a longitudinal sectional view showing a configuration of a distal end of an insertion portion of an endoscope, FIG. 2 is a configuration explanatory view showing a schematic configuration of an endoscope system, and FIG. 3 is a treatment instrument insertion channel and a light guide. FIG. 4 is a side view showing a configuration in the vicinity of the operation unit with the camera attached to the eyepiece, FIG. 5 is a rear view of the operation unit viewed from the eyepiece lens, and FIG. 4 is a side view showing a state in which the camera is operated, FIG. 7 is a plan view of the insulating cover viewed from the front end side, FIG. 8 is a cross-sectional view taken along line AA of FIG. 1, and FIG. FIG. 10 is a cross-sectional view taken along the line BB of FIG. 1, and FIG. 11 is an operation explanatory view showing an assembling method when attaching the air / water supply nozzle.

As shown in FIG. 2, an endoscope system 1 according to a first embodiment comprises an endoscope 2 comprising a fiberscope.
The endoscope 2 has an elongated and flexible insertion section 3 and a wide-width operation section 4 connected to the rear end of the insertion section 3.
And a universal cord 10 extending from the side of the operation unit 4.

The insertion portion 3 is covered with a resin such as polyurethane, and the rear end portion of the connection portion connected to the operation portion 4 is protected by a buckling prevention portion 12. Insertion part 3
Is provided with a bendable bending portion 6 covered with a soft elastic body. At the tip of the curved portion 6, a hard tip 5 is provided. On the front surface of the tip 5, an illumination optical system 13 for illumination, an observation optical system 14 for observation, An outer surface of the observation optical system 14 is provided with an air / water nozzle 15 for performing air / water supply, a treatment tool outlet 16 from which a treatment tool such as forceps is projected. As shown in FIG. 1, an image guide 19 composed of an optical fiber bundle is arranged at an image forming position of the observation optical system 14, and the formed optical image is converted into an eyepiece unit 20 provided at the rear end of the operation unit 4. To be communicated to.

The operation unit 4 is provided with a suction control device 17 for use in performing suction and an air / water supply control device 18 for use in performing air / water supply. Further, two bending operation knobs 9 made of hard resin are attached to the operation unit 4, and by operating these bending operation knobs 9, the bending unit 6 can be bent vertically and horizontally.
A lock lever 21 made of a hard resin, which is used when the bending portion 6 is set in the bending fixed state or released from the fixed state, is attached near the bending operation knob 9.

The universal cord 10 having one end connected to the operation unit 4 is coated with a resin such as polyurethane, and a connector 11 is connected to the other end. The connection portions to the operation unit 4 and the connector 11 at both ends of the universal cord 10 are protected by buckling stoppers 22 and 23, respectively. The connector 11 can be detachably connected to a connector receiver 25 of the light source device 24.

The connector 11 has a metal ground terminal 26 for returning high-frequency leakage current to the cautery device during the cautery procedure.
And a metal pressure cap 27 for pressurizing a water tank (not shown), and a metal water cap 28 for connecting a water pipe.
And a metal air supply mouthpiece 29 for connecting an air supply pipe line,
Metal suction base 3 to which a suction pump (not shown) is connected
0, a plurality of electrical contacts 31 for exchanging electrical signals,
A light guide base 32 for receiving illumination light from the light source device 24, and a communication base 33 for connecting a communication cap (not shown) for communicating the inside of the endoscope 2 with the outside air when performing ethylene oxide sterilization or the like. Are provided respectively.

An operation unit 4 is provided on the insertion unit 3 side of the operation unit 4.
Is provided with a gripping portion 34 made of a hard resin such as polysulfone for gripping the. The grasping portion 34 is provided with a treatment tool insertion port 8 through which a treatment tool such as forceps is inserted, and a forceps stopper 35 formed of an elastic body such as silicon rubber is detachably attached to the treatment tool insertion port 8. Attached to.

As shown in FIGS. 4 and 5, an eyepiece 20 provided at the rear end of the operation unit 4, an eyepiece 40, a diopter ring 38 for adjusting diopter, and a camera shown in FIG. The bayonet 36 to which the connector 37 can be attached and detached, and the electrical contact 3 of the connector 11
An electrical contact 39 is provided which is electrically connected to 1 and can transmit a shutter driving signal, a brightness control signal of the light source device 24, exposure information, and the like between the camera 37 and the light source device 24 or the like.

The camera 37 has a camera body 41, an adapter 42 for connecting the camera body 41 and the eyepiece 20, and a release lever 43. A release button 44 is provided on the adapter 42, and the camera body 4
Release button 4 of release lever 43 extended from 1
A release lever button 45 is provided at a position facing the release button 4, and the release operation of the camera 37 can be performed by pressing the distal end portion 46 of the release lever 43 toward the release button 44.

The universal cord 10 of the operation unit 4
In the vicinity of the extension portion, a finger hook 47 is provided so as to protrude, and the finger hook 47 has a lower upper surface 48 so that the operator's finger can easily reach during the release operation as shown in FIG. Is provided. A name tag 49 on which a model name or the like can be written is attached to the upper surface portion 48 with an adhesive or the like and is provided on the same surface as the upper surface portion 48. The model name or the like described in the name tag 49 suppresses manufacturing costs. Therefore, it is described by pad printing or the like.

As shown in FIGS. 1 and 3, an illumination optical system 13, an observation optical system 14, an air / water nozzle 15, a treatment tool outlet 16 and the like are incorporated in a distal end body 50 constituting the distal end portion 5. ing. The distal end portion main body 50 of the present embodiment is made of, for example, a metal material such as stainless steel. On the other hand, the bending portion 6 is configured such that a plurality of bending pieces 51 made of a metal material such as a stainless steel pipe are rotatably connected to each other by rivets 52, and an electrically insulating synthetic resin such as a synthetic resin, for example, is provided around the bending piece 51. It is configured by coating an outer skin 53 made of fluorine rubber, EPT or the like.

An insulating cover 54 made of an electrically insulating material such as polysulfone is fitted over and bonded to the distal end surface and the outer peripheral surface on the distal end side of the distal end body 50. The insulating cover 54 is formed substantially in the shape of a cap. Insulation cover 5
4 is an air / water supply nozzle 15 substantially parallel to the axial direction of the insertion portion 3.
The insulating cover 54 has a through-hole 58 for disposition, and the insulating cover 54 has a convex portion 59 on the radial side near the through-hole 58. On the other hand, the distal end body 50 has a concave portion 60 at a position corresponding to the convex portion 59, and the convex portion 59 and the concave portion 60 are formed.
Are fitted.

An air supply / water supply nozzle 15 for cleaning the distal end surface of the observation optical system 14 is fitted into the through hole 58, as shown in FIG.
The engagement pin 61 shown in FIG. 2 is engaged in the side cover 106 to be locked in the insulating cover 54. As shown in FIG. 9, a step portion 62 is provided in the vicinity of the tip of the through hole 58, and this step portion 62 comes into contact with the step portion 63 of the air / water nozzle 15, and these come into contact with the positioning contact portion 64.
Thus, positioning in the axial direction is performed.

At the position corresponding to the through hole 58 in the distal end main body 50, a through hole for air / water supply is provided in a direction having an angle on the center axis side of the insertion portion 3 with respect to the axial direction of the air / water supply nozzle 15. A hole 65 is provided. The distal end of the through hole 65 is coaxial with the air / water supply nozzle 15 and has a distal end 56.
The inner diameter r2 is larger than the inner diameter r1 of the through hole 58 at the proximal end 57 of the insulating cover 54 (that is, r2> r1), and a tapered hole 66 is provided which decreases in diameter toward the operation unit 4 side. Have been. On the contact surface between the distal end 56 of the distal end body 50 and the proximal end 57 of the insulating cover 54, a step is generated due to the difference in the inner diameter of the through hole 58 and the tapered hole 66. As shown in FIG. 9, for example, an epoxy-based adhesive 81 is filled to form a resin layer,
The through hole 58 and the tapered hole 66 communicate with each other without a step.

On the proximal side of the through hole 65, a pipe fitting hole into which an air / water supply pipe 68 coaxial with the through hole 65 and having the same inner diameter as the through hole 65 is fitted from the proximal end surface 67 of the distal end body 50. 69 are provided. A step portion 70 is provided at the back of the pipe fitting hole 69, and a distal end surface 71 of the air / water pipe 68 fitted into the pipe fitting hole 69 is positioned in contact with the fitting portion 69. Is fixed with solder 72 or the like so that the air / water supply pipe 68 can be attached. This air / water supply pipe 68 may be fixed using, for example, an epoxy adhesive.

The rear end 73 of the air / water pipe 68 protrudes from the proximal end face 67 of the tip body 50 and is bent in a direction substantially parallel to the axial direction of the air / water nozzle 15 and non-coaxial with the through hole 58. The distal end of the air / water supply tube 74 inserted through the insertion portion 3 is attached to the protruding portion, and the inner surface on the distal end side of the air / water supply tube 74 is attached to the outer peripheral surface of the air / water supply pipe 68 by, for example, an epoxy-based material. And the like. Further, the outer periphery near the distal end of the air / water supply tube 74 is partially tied and fixed with, for example, a yarn 75 made of nylon or the like, and a heat-shrinkable tube 76 made of, for example, FEP or the like is covered from the back of the yarn tying portion to be tightly adhered. By letting
The rear end 73 of the air / water supply pipe 68 and the air / water supply tube 7
4 are tightly fixed.

The distal end main body 50 is provided with a through-hole 78 for disposing the observation optical system 14 substantially in parallel with the axial direction of the insertion section 3, and an objective composed of a plurality of lens groups constituting the observation optical system 14. The lens unit 83 is arranged and fixed. On the other hand, the insulating cover 54 has a first objective lens 55 at a position facing the first objective lens 55 of the objective lens unit 83.
A through hole 86 having a diameter larger than the outer diameter of the first objective lens 55 is inserted through the through hole 86. The gap between the first objective lens 55 and the through hole 86 is filled with an adhesive such as an epoxy resin in a watertight manner.

On the rear end surface of the objective lens unit 83, the image guide 19 fitted with the front end fitted to the base 77 is adhered.
Has been fixed. The rear end side of the base 77 is the tip body 50.
And an elastic protective tube 98 for covering and protecting the image guide 19 at the rear end thereof.
Is fixed, and a protective tube 79 is further covered on the outside thereof, and is partially bound and fixed by a thread 80 made of nylon or the like.

The distal end body 50 has two through holes 8 for arranging the illumination optical system 13 substantially parallel to the axial direction of the insertion section 3.
An illumination lens unit 84 constituting the illumination optical system 13 and a distal end surface of a light guide 85 formed of an optical fiber bundle provided on the hand side of the illumination lens unit 84 are also fixed. The distal end of the light guide 85 is fitted and adhered to the base 88, inserted into the through hole 82, and fixed in the distal end body 50 by a fixing screw, solder 90, or the like (not shown). The rear end of the base 88 protrudes from the proximal end surface 67 of the distal end body 50, and an elastic protective tube 99 for covering and protecting the light guide 85 is fixed to the rear end, and the protective tube 8 is further provided outside the protective tube 99.
9 is covered and partially bound and fixed by a thread 91 made of nylon or the like. The illumination lens unit 84 is fixed to the through hole 82 with, for example, an epoxy-based adhesive.

On the other hand, the insulating cover 54 is provided with a through-hole 87 having a diameter larger than the outer diameter of the illumination lens unit 84 at a position corresponding to the illumination lens unit 84, and the illumination lens unit 84 is inserted into the through-hole 87. It has been inserted. At this time, one of the two through holes 87 is
7 to interfere with the through-hole 86 in order to reduce the outer diameter of FIG.
Are connected as shown. The gap between the illumination lens unit 84 and the through-hole 87 is filled with an adhesive such as an epoxy system in a watertight manner.

As shown in FIG. 3, the distal end body 50 has a through hole 93 penetrating substantially in parallel with the axial direction of the insertion section 3, and the treatment instrument outlet 16 and the treatment instrument insertion port are provided at both ends. A treatment tool insertion pipe 92, which constitutes the distal end of the treatment tool insertion channel 7 that communicates with each of the treatment tools 8, is arranged and fixed. On the other hand, a through-hole 95 having a diameter larger than the outer diameter of the treatment instrument insertion pipe 92 is provided in the insulating cover 54 at a position corresponding to the treatment instrument insertion pipe 92 in the axial direction. Is inserted to form a treatment instrument outlet 16.

The treatment instrument insertion pipe 92 is connected to the distal end main body 50.
After being positioned by being fitted in the through hole 93 of the tip end portion, it is fixed to the tip end body 50 by the solder 94. Further, the through-hole 95 of the insulating cover 54 and the treatment instrument insertion pipe 9
The gap between the two is filled with an adhesive such as an epoxy system so as to fill the gap in a watertight manner. Treatment instrument insertion pipe 9
The rear end of the treatment instrument 2 extends in the proximal direction from the proximal end surface 67 of the distal end body 50, and a channel tube 96 is attached to the rear end of the distal end main body 50. The inner periphery of the distal end of the channel tube 96 is adhered, and a thread winding portion 97 is provided on the outer periphery of the distal end of the channel tube 96 so that the adhesion surface is brought into close contact with the thread.

Further, as shown in FIG.
In the cross section near the hand side end face 67 of the zero, a bending wire 100 for bending and driving the bending portion 6 is inserted, and the bending wire 51 is provided with one bending wire 100 for each of four directions (up, down, left and right) at every 90 degrees. A protruding portion 101 protruding on the inner peripheral side for fixing by brazing or the like is provided.

The procedure for assembling the distal end of the endoscope 2 configured as described above will be described below.

First, the air / water supply pipe 68 and the treatment instrument insertion pipe 92 are positioned and fixed in the through-hole 65 and the through-hole 93 of the distal end body 50 with solders 72 and 90 or an adhesive such as epoxy. At this time, the solder and the adhesive are applied to the entire fitting portion of the air / water supply pipe 68 to the distal end body 50 so as to fill the gap between the air / water supply pipe 68 and the distal end body 50. I do.

Here, the through hole 65 is provided for the air / water supply nozzle 15.
The air / water pipe 68 is formed so as to have a certain angle with respect to the axial direction of the insertion section 3 with respect to the axial direction of the insertion section 3.
1 is arranged substantially non-coaxially in parallel with FIG.
The air / water supply nozzle 15 and the air / water supply pipe 68 as shown in FIG.
The rear end portion 73 is substantially parallel to and offset from the axial direction of the insertion portion 3.

Next, the objective lens unit 83 and the two illumination lens units 84 are coated with an epoxy-based adhesive or the like, inserted into the through holes 78 and the through holes 82 of the distal end body 50, and positioned and bonded and fixed. .

Then, the distal end 56 of the distal end body 50
An adhesive is applied to the proximal end 57 of the insulating cover 54 and the proximal end thereof, and the insulating cover 54 is fitted and fixed to the distal end main body 50. At this time, as shown in FIG. 11, a fitting portion 104 having substantially the same diameter as the inner diameter r1 of the through hole 58 at the proximal end portion 57 and a tapered portion 103 substantially equal to the tapered hole 66 at the tip end of the through hole 65 are provided. A taper rod 102 made of a material having a high surface lubricity such as PTFE is inserted into the through hole 58 from the tip side until it comes into contact with the taper hole 66. As a result, the excess adhesive 81 is removed from the taper rod 102 and the through hole 58.
The resin layer is formed by filling a space formed by the tapered hole 66 and the through hole 66 so that the through hole 58 and the tapered hole 66 can communicate with each other without a step.

The objective lens unit 83 and the through hole 8
6 and the gap between the illumination lens unit 84 and the through hole 87 are also filled with an adhesive such as an epoxy resin in a watertight manner, and after the adhesive is cured, the distal end surface of the insulating cover 54 is formed smoothly. At this time, since the tapered rod 102 is formed of a material having a high surface lubricity such as PTFE, the tapered rod 1
In 02, the adhesive is not cured and fixed.

Next, an epoxy-based adhesive or the like is applied to the outer periphery of the rear end 73 of the air / water pipe 68 and the outer periphery of the rear end of the treatment instrument insertion pipe 92, and the air / water tube 7
4. Cover the channel tube 96 with adhesive.
Then, the yarn 75 is partially wound around the outer periphery of the air / water supply tube 74 and tied, and the yarn is wound around the outer periphery of the channel tube 96 over substantially the entire length of the covering portion.
By providing 7, the adhesion surface is brought into close contact. Further, the outer periphery of the air / water supply tube 74 is covered with a heat-shrinkable tube 76 from the rear of the thread binding portion to the near side.

Thereafter, the distal end of the light guide 85 is inserted into the through hole 82 of the distal end main body 50, brought into contact with the proximal end of the illumination lens unit 84, and fixed from the distal end main body 50 with screws (not shown). Reinforce by applying an adhesive such as silicon. Further, the image guide 19 is inserted into the through hole 78 of the distal end main body 50, and after adjusting the focal position, the image guide 19 is fixed from the distal end main body 50 with a screw (not shown), and is reinforced by applying a silicone-based adhesive or the like.

Next, an adhesive such as silicon is applied to the outer periphery of the air / water supply nozzle 15 and the air / water supply nozzle 15 is inserted into the through hole 58 of the insulating cover 54 from the front end side, as shown in FIG. It is brought into contact with the positioning contact part 64. Further, the exit direction of the air / water supply is adjusted such that the opening 105 of the air / water supply nozzle 15 opens toward the first objective lens 55. In this state, an adhesive such as silicon is applied to the side through holes 106 provided in the insulating cover 54 shown in FIG. 8, and the locking pins 61 are inserted to fix the air / water nozzle 15.

As described above, according to the configuration of the first embodiment, the positional relationship between the air / water supply nozzle 15 and the rear end 73 of the air / water supply pipe 68 is substantially parallel to the insertion portion axial direction and offset. And the offset position thereof can be arbitrarily set by changing the angle of the through hole 65 for fitting and fixing the air / water supply pipe 68. Therefore, the curvature in the vicinity of the proximal end surface 67 of the distal end main body 50 shown in FIG. Arrangement of the internal components in the part 6 can be freely performed. As a result, the outer diameter of the insertion section 3 can be reduced, so that the patient's pain during endoscopy can be reduced, and good insertion properties can be obtained. Further, since the resin layer is formed by filling the step portion between the through hole 58 of the insulating cover 54 and the tapered hole 66 of the tip end body 50 with the adhesive 81, the through hole 58 and the tapered hole 66 communicate with each other without any step. Since it is possible, the washing property is also good.

12 to 14 relate to a second embodiment of the present invention. FIG. 12 is an explanatory view showing a schematic configuration of an endoscope system, and FIG. 13 is a partially enlarged view of a distal end portion including an air / water nozzle. FIG. 14 is a sectional view and FIG. 14 is an operation explanatory view showing an assembling method when the air / water supply nozzle is attached.

As shown in FIG. 12, the endoscope system 1 of the second embodiment has an electronic endoscope 107 provided with an image pickup means.
The electronic endoscope 107 has an elongated and flexible insertion section 3 similar to the endoscope 2 of the first embodiment, and a wide width connected to the rear end of the insertion section 3. , And a universal cord 10 extending from the side of the operation unit 4.

Unlike the first embodiment, instead of the image guide 19, an image pickup device such as a charge-coupled device (not shown) is arranged at the image forming position of the observation optical system 14 provided at the distal end portion 5 of the insertion section 3, The formed optical image is photoelectrically converted. Further, the operation unit 4 is not provided with the eyepiece unit 20, and the remote switch 1 for performing an operation instruction regarding processing of an image signal output from the image sensor is provided.
08 is attached.

As shown in FIG. 13, a through-hole 65 of the distal end body 50 provided corresponding to the through-hole 58 of the insulating cover 54 to which the air / water supply nozzle 15 is attached is provided at the front end side with the air / water supply nozzle. A taper hole 66 is provided coaxially with the tapered hole 15 and decreases in diameter toward the operation section 4.
4 is smaller than the inner diameter r1 of the through hole 58 at the proximal end 57 (that is, r2 <r1).

Insertion section 3 and operation section 4 of electronic endoscope 107
The other parts in are configured in the same manner as in the first embodiment, and a description thereof will be omitted.

The connector 11 at the end of the universal cord 10 is provided with an electronic connector section 109 on the side face.
5 and the electronic connector 10
9 is connected to a video processor 111 that performs signal processing on an image signal output from the image sensor.
The video signal generated by the display 11 is output to the monitor 112 to be displayed as an image.

In the second embodiment, when ethylene oxide sterilization or the like is performed, the inside of the electronic endoscope 107 and the outside air communicate with each other at the electronic connector portion 109, so that the connector 11 is provided with the communication base 33. Not.

A keyboard (not shown) is connected to the light source device 24 as means for inputting patient information such as a patient's name, age, gender, and the like, and ID information for examination such as endoscope model information. I have. This ID information is displayed not only on the monitor 112 but also based on the ID information.
Even if the electronic endoscope 107 is changed to a model having different characteristics, the white balance of the video processor 111, the light-collecting characteristics and the aperture of the light source device 24 are automatically controlled by the control unit provided in the light source device 24 or the video processor 111. It can be adjusted optimally for that model. Note that this ID information is not limited to input from the keyboard, but may be input from the electronic endoscope 107.
Built-in memory means for storing ID information for each model, and when the electronic endoscope 107 is connected to the light source device 24, the light source device 24 or video processor 11
One control unit may be able to detect the ID information so that it can be adjusted optimally.

The distal end of the electronic endoscope 107 thus constructed is assembled in substantially the same manner as in the first embodiment except that an image pickup device (not shown) is attached instead of the image guide 19. Therefore, only the differences will be described below.

As shown in FIG. 14, when the insulating cover 54 is adhered and fixed to the distal end main body 50, the distal end main body 50
An adhesive is applied to each of the distal end 56 and the proximal end 57 of the insulating cover 54, and the through-hole 5 at the proximal end 57 is formed.
A tapered rod 113 made of a material having high surface lubricity such as PTFE having a fitting portion having substantially the same diameter as the inner diameter r1 of the first through hole 8 and a tapered portion substantially equal to the tapered hole 66 at the front end of the through hole 65 is attached to the front end. The insulating cover 54 is fitted to the tip main body 50 until the taper hole 66 comes into contact with the through hole 58. As a result, the excess adhesive is filled in the space formed by the tapered rod 113, the through hole 58, and the tapered hole 66 to form a resin layer, and the through hole 58 and the tapered hole 66 are formed without a step.
Can communicate with

In the second embodiment described above, similarly to the first embodiment, the air / water supply nozzle 15 and the rear end 73 of the air / water supply pipe 68 are offset substantially parallel to the axial direction of the insertion portion. , The degree of freedom of arrangement of the built-in object in the curved portion 6 near the proximal end surface 67 of the distal end body 50 can be increased, and the outer diameter of the insertion portion 3 can be reduced. Further, the through hole 58 of the insulating cover 54 and the tip end body 5
Since the resin layer is formed by filling the adhesive 81 in the stepped portion with the 0 tapered hole 66, the through hole 58 and the tapered hole 66 can communicate with each other without a step, and the cleaning property can be kept good.

[Supplementary Notes] (1) A first through-hole provided in an insulating cover for electrically insulating and covering the distal end body constituting the distal end of the insertion portion, and the distal end so as to communicate with the first through-hole. An endoscope comprising: a second through hole provided in a main body of the unit, a conduit formed by communicating the first and second through holes, and an operation unit connected to the insertion unit. An endoscope, wherein a resin layer is formed on a step formed by a difference in inner diameter at a position where the first through hole and the second through hole are connected.

(2) The second through-hole has an inner diameter larger than the inner diameter of the first through-hole and coaxial with the first through-hole at an end face on the insulating cover side. The endoscope according to supplementary note 1.

(3) The second through-hole has an inner diameter smaller than an inner diameter of the first through-hole and coaxial with the first through-hole at an end face on the insulating cover side. 2. The endoscope according to 1.

(4) The second through hole has a tapered portion coaxial with the first through hole, the inner diameter of which is reduced from the insulating cover side end surface toward the operating portion, and a tapered portion of the tapered portion. A communication hole communicating with the axis at an angle,
4. The endoscope according to claim 2, wherein the endoscope comprises:

(5) The resin layer is provided at a position where the first through hole and the second through hole are connected to each other.
3. The endoscope according to claim 2, wherein the endoscope has an inner diameter equal to the inner diameter of the through hole at the operation section side end face.

(6) The second through-hole has a tapered portion coaxial with the first through-hole, the inner diameter of which is reduced from the insulating cover side end surface toward the operating portion side end surface.
A communication hole communicating with the axis of the tapered portion at an angle, wherein the resin layer has a first through hole at a position where the first through hole and the second through hole are connected to each other; 3. The endoscope according to claim 2, wherein the endoscope has an inner diameter equal to the inner diameter of the hole at the operation section side end face.

(7) The second through-hole has a tapered portion coaxial with the first through-hole, the inner diameter of which decreases from the insulating cover side end surface toward the operating portion side end surface.
A communication hole communicating with the axis of the tapered portion at an angle, and the resin layer expands in diameter toward the distal end side of the insulating cover continuously with the tapered portion of the second through hole. 4. The endoscope according to claim 3, wherein the endoscope has an enlarged diameter portion.

(8) The endoscope according to appendix 7, wherein the resin layer has a taper equal to a tapered portion of the second through hole.

(9) The endoscope according to Supplementary Notes 1 to 8, wherein the conduit is a conduit through which at least one of air supply and water supply is performed.

(10) The endoscope according to Supplementary Notes 1 to 8, wherein the conduit is a treatment instrument insertion conduit.

[0063]

As described above, according to the present invention, a cleaning nozzle is provided which is insulated from the distal end body without impairing the cleaning performance in the conduit, and the outer diameter of the distal end of the endoscope is reduced. The diameter can be reduced, and there is an effect that pain of the patient can be reduced and good insertion properties can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a distal end of an insertion portion of an endoscope according to a first embodiment of the present invention.

FIG. 2 is a configuration explanatory diagram showing a schematic configuration of the endoscope system according to the first embodiment;

FIG. 3 is a vertical cross-sectional view of a distal end of an insertion portion including a treatment tool insertion channel and a light guide.

FIG. 4 is a side view showing a configuration near an operation unit in which a camera is attached to an eyepiece;

FIG. 5 is a rear view of the operation unit viewed from the eyepiece side.

FIG. 6 is a side view showing a state in which the camera of FIG. 4 is operated.

FIG. 7 is a plan view of the insulating cover as viewed from the front end side.

FIG. 8 is a sectional view taken along line AA of FIG. 1;

FIG. 9 is a partially enlarged cross-sectional view of a distal end portion including an air supply / water supply nozzle in the endoscope according to the first embodiment.

FIG. 10 is a sectional view taken along line BB of FIG. 1;

FIG. 11 is an operation explanatory view showing an assembling method when attaching the air / water supply nozzle in the first embodiment.

FIG. 12 is a configuration explanatory diagram showing a schematic configuration of an endoscope system according to a second embodiment;

FIG. 13 is a partially enlarged cross-sectional view of a distal end portion including an air / water supply nozzle in the endoscope according to the second embodiment.

FIG. 14 is an operation explanatory view showing an assembling method when attaching the air / water supply nozzle in the second embodiment.

FIG. 15 is a cross-sectional view showing the configuration near the objective cleaning nozzle in the distal end portion of a conventional endoscope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Endoscope 3 ... Insertion part 5 ... Tip part 15 ... Air supply / water supply nozzle 50 ... Tip part main body 54 ... Insulation cover 58, 65 ... Through hole 66 ... Tapered hole 68 ... Air supply / water supply pipe 81 ... Adhesive

Claims (1)

[Claims] A first through-hole provided in an insulating cover for electrically insulating and covering the distal end portion main body constituting the distal end of the insertion portion; and a first through-hole provided in the distal end portion main body so as to communicate with the first through-hole. An endoscope comprising: a second through hole provided; a conduit formed by communicating the first and second through holes; and an operation unit connected to the insertion unit. An endoscope, wherein a resin layer is formed on a step generated by a difference in inner diameter at a position where the through hole and the second through hole are connected.