JPH06315456A - Endoscope - Google Patents

Abstract

PURPOSE:To provide an endoscope with higher washability and operability. CONSTITUTION:In an endoscope consisting of a treatment device standing table which is positioned at the head of the inserting portion to change the treatment device projecting direction and is operated so that it freely stands by a manipulating section near at hand via a manipulation wire 58, and consisting of a guide pipe which leads the above mentioned manipulation wire 58 to the above mentioned manipulation section, a transfer rod 250 which transmits a manipulation power of the manipulation section to the manipulation wire 58 as a drawing power, the transfer rod 250 is placed so that its axial line approximately aliens with the axial line of a manipulation section opening 224 of the guide pipe, and the manipulation wire 58 led from the opening 224 is connected to the transfer rod 250 so that they are removed freely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope provided with a treatment tool standing device.

[0002]

2. Description of the Related Art There is known an endoscope having a treatment instrument stand for changing the projecting direction of the treatment instrument on the distal end side of an insertion portion. The treatment instrument stand is operated by operating the operation wire connected to the treatment tool stand by advancing and retracting it by the standing operation device in the hand operation section.

In general, medical endoscopes such as gastroscopes and duodenal scopes are inserted into the body cavity of a patient to observe and treat the affected area. In this case, the treatment instrument is observed while observing the affected area. In order to collect or treat biopsy tissue using the instrument, it is necessary to bend and displace the treatment tool so as to face the desired affected part. In such a case, the treatment tool stand and the upright operation device. And will be required.

[0004]

By the way, since the operation wire for raising the treatment instrument stand is inserted into the wire insertion pipe provided in the insertion portion of the endoscope, the inside of the wire insertion pipe is cleaned. When carrying out, the operating wire was an obstacle and the cleaning performance was poor.

Therefore, Japanese Utility Model Publication No. 3-46727 proposes a structure in which the operation wire can be easily removed from the wire insertion pipe.

However, since the flexible tube corresponding to the wire insertion pipe draws a long loop in the proximal operation portion of the endoscope, even if the operation wire is removed from the wire insertion pipe, the above-mentioned operation is eventually possible. The cleaning of the flexible tube takes time, and the poor cleaning property cannot be eliminated.

On the other hand, in the configuration disclosed in Japanese Patent Laid-Open No. 59-181126, a wire guide tube portion for guiding the operation wire and a conduit portion communicating with the wire guide tube portion are formed outside the hand side operation portion. ing. Further, in this configuration, it is disclosed that the wire operating body that moves the operating wire forward and backward makes a linear motion.

However, since the wire operating body performs the rotational movement of the operating lever through the pin, the frictional resistance is large and the operability is poor. Further, since the operation wire cannot be removed, cleaning of the inside of the wire insertion pipe also takes time, and a large number of uneven portions are formed around the operation lever on the operation section side, resulting in extremely poor cleaning performance.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an endoscope having good cleanability and operability.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an operation wire which is arranged at a distal end side portion of an insertion portion in order to change a projecting direction of a treatment tool and which is operated by an operation portion on a hand side. In an endoscope including a treatment instrument stand that is operated to be erected freely via a guide pipe and a guide pipe that guides the operation wire toward the operation unit side, the operation force in the operation unit is used as a traction force to perform the operation. A transmission rod for transmitting the wire, and the transmission rod is arranged such that the axis of the opening on the operation portion side of the guide pipe and the axis of the transmission rod are located on substantially the same straight line, and the opening is formed. The operation wire and the transmission rod led out from the section are detachably connected.

[0011]

With the above construction, the amount of displacement transmitted from the erection drive device to the transmission rod is surely transmitted to the erection base at the tip end, so that the response is good and the operability is good. Further, since the path from the transmission rod to the operation wire is made substantially linear, the operation wire is not buckled and the durability is improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 24 show a first embodiment of the present invention. As shown in FIG. 2, the endoscope 1 according to the present embodiment.
The operation section 3, the grip section 4, and the insertion section 6 constitute an endoscope body. The operation section 3 is provided with the switch section 2 and the universal cord 7 is connected thereto. A forceps opening 5 is provided on the tip side of the grip 4. Further, a connector 8 is provided at the tip of the universal cord 7.

The switch section 2 is provided with switches 9 ... Which perform various functions, and these switches 9 ... Can remotely perform image freeze, release and the like.

The operation portion 3 includes an up / down angle knob 11 for vertically bending the bending portion 10 provided on the distal end side of the insertion portion 6, and a left / right angle knob 12 for horizontally bending the bending portion 10. By rotating these angle knobs 11 and 12, which are provided, the tip portion 13 connected to the tip of the bending portion 10 can be moved in a desired direction.

Further, the angle knobs 11 and 12 are provided with a vertical engagement lever 14 and a left and right engagement lever 15 as a brake mechanism capable of increasing the rotational resistance and stopping the bending state of the bending portion 10 on the way. It is provided.

Further, the operation portion 3 includes an air / water feeding button 16 for performing an air / water feeding operation for expelling gas or liquid from the tip portion 13, and a suction button 17 for performing a suction operation from the tip portion 13. Is provided. Further, the operation unit 3
The treatment tool stand 1 provided on the distal end portion 13 is described below.
A raising stand operating lever 19 for operating 8 (hereinafter, simply referred to as a raising stand 18) is provided coaxially with the rotation shafts of the vertical angle knob 11 and the horizontal angle knob 12.

Inside the universal cord 7, a light guide fiber 39 (see FIG. 5), a cable (not shown), various tubes and the like are incorporated. And
The universal cord 7 is connected to the light source device 20 via a connector 8 at its tip. Further, the connector 8 is connected to the water supply tank 22 via a tube, and the water from the water supply tank 22 passes through the air supply / water supply tube 33 (see FIG. 5) installed from the universal cord 7 to the insertion portion 6 and the tip portion 13 It is designed to be sent to.

A suction conduit (not shown) having one end opened at the tip 13 and the other end opened at the connector 8 is opened and closed by a suction switching valve (not shown) attached to the suction button 17. Are controlled. And
The suction pipe line is on the connector section 8 side, and the suction tube 2
It is connected to a suction bottle 24 connected to a suction pump via 3.

The connector portion 8 is an electric cable 25.
It is connected to the video processor 21 via. Further, the video processor 21 is electrically connected to the monitor 26 so that an endoscopic image captured by the observation optical system of the distal end portion 13 can be displayed on the monitor 26.

Next, the tip portion 13 provided at the tip of the insertion portion 6 will be described. As shown in FIG. 4 or FIG.
The distal end portion 13 is composed of a distal end portion main body 13a formed of a distal end constituent member 29 and integrated with the insertion portion 6, and a distal end cover portion 27 detachably provided on the distal end portion main body 13a. Tip component member 29 forming the tip body 13a
An illumination lens 30 and an objective lens 31 are provided on the tip side of the. The nozzle 3 is provided on the base end side of the objective lens 31.
The tip of 2 is arranged and fixed toward the objective lens 31. The rear end of the nozzle 32 is connected to an air / water supply tube 33 as shown in FIG. 5, and the base end side of the air / water supply tube 33 is an air / water supply not shown attached to an air / water supply button of the operation unit 3. It is connected to the switching valve. Then, by operating the air / water supply button 16, water or air is supplied to the nozzle 3
2 can be ejected from the surface of the objective lens 31, and dirt on the surface of the objective lens 31 can be removed.

The nozzle 32 is adhesively fixed to the tip forming member 29, and the gap between the nozzle 32 and the nozzle cover portion 28a of the tip cover 28 of the tip body 13a, which will be described later, is filled with the adhesive 34. By doing so, it is sealed so that dirt is prevented from entering the tip portion 13.

The tip of a bending piece 35a which controls the bending operation of the bending portion 10 is fixed to the base end of the tip forming member 29 by a screw (not shown). The main body of the bending portion 10 is configured by a bending tube portion 35 configured by rotatably connecting a plurality of bending pieces 35a. A mesh tube 36 and a curved rubber 37 are sequentially fitted on the outer circumference of the curved tube portion 35.

The tip end side of the curving rubber 37 is wound and fixed by a thread 38, and the fixing strength is enhanced by applying an adhesive on the fixed portion. In this bonding work, since the annular portion 28b of the tip end cover 28 forms a wall over the entire circumference on the tip side of the bonded portion, the adhesive does not flow out, and the workability is improved.

On the other hand, a light guide fiber 39 is arranged in a substantially L shape below the illumination lens 30 provided on the tip end main body 13a. Light guide fiber 39
Since a plurality of fibers are only solidified with an adhesive, the tip end portion of the light guide fiber 39 is fixed with a screw 41 via a fixing plate 40 as shown in FIG. There is. Further, the presence of the fixing plate 40 prevents the screw 41 from being directly rotated and screwed into the glass fiber, so that the light guide fiber 39 can be prevented from being damaged during assembly. In addition, light guide fiber 3
An arc-shaped lid 42 is fixed to the lower part of 9 by an adhesive.

As shown in FIG. 5, the objective lens system, which is the other optical system, has a type rhythm 43 arranged below the objective lens 31 and has an objective lens group 44 substantially in the axial direction of the insertion section 6. An image pickup unit 45 is provided. The image pickup unit 45 is fixed with screws 46 as shown in FIG. The screw 46 is adhered with a silicone-based elastic adhesive 47, and the elastic adhesive 47 is also filled in the recessed portion of the screw 46 after tightening.

The tip cover 28 is prevented from coming off by a pin 55 as shown in FIG. This pin 55
Is fixed to the tip forming member 29 with an adhesive, and the recess 56 formed between the pin 55 and the tip cover 28 is also filled with the adhesive 56. When assembling the tip cover 28 and the tip component member 29, an adhesive is applied to the inner surface of the tip cover 28 and the outer surface of the tip component member 29 on which the tip cover 28 is covered to prevent air bubbles from entering. Perform the bonding work. At the time of this bonding work, the adhesive is applied to every corner of the contact surface between the tip cover 28 and the tip component member 29 by wiping off the adhesive protruding to the outside to form a gap between the contact surfaces. Make sure that they are in close contact with each other so that dirt does not enter the tip portion 13.

As shown in FIGS. 6, 7 and 11, the tip end side of the tip end cover 28 has a shape in which a circle is cut out by about 3/4 circumference. As shown in FIG. 5, a nozzle cover portion 28 a that covers the nozzle 32 is formed on the rear end side of the tip end cover 28. Further, a thick wall portion 50 is formed in the lower portion of the nozzle cover portion 28a for firmly engaging with the cover member 48 of the tip cover portion 27 detachably attached to the tip portion main body 13a. A thin portion 52 for engaging with the C-shaped deforming portion 51 of the cover member 48 is formed on the base end side of the thick portion 50.

The outer surface of the thick portion 50 is R-chamfered 53 so as not to damage the living body. The R chamfer 53 makes it difficult for dirt to collect at the corners of the outer surface of the thick portion 50, and therefore the cleanability of this portion is improved.
Similarly, the round chamfer 53 is also applied to the step portion between the thin portion 52 and the thick portion 50 to improve the cleaning property.

A ring-shaped annular portion 28b is formed on the base end side of the thin portion 52. This annular portion 28b is
As described above, the curved rubber 37 is tightened and fixed by the thread 38, and when the adhesive is applied on the curved rubber 37, the curved rubber 37 serves as a wall, which facilitates the bonding work.

Next, the tip cover portion 27 detachably attached to the tip portion main body 13a will be described. As shown in FIG. 9 (a), the tip cover portion 27 has a standing base 18 and an insulating block 5 inside a cover member 48 as an outer frame.
And 7 are provided. Stand 18
A tip of an operation wire 58 for operating the stand 18 to stand is connected to.

The tip end side of the cover member 48 has a rounded shape as shown in FIG. 10 and has a cross section of a circle cut out by about 3/4 circumference as shown in FIG. Further, when the stand 18 is raised, a thin treatment tool is prevented from being sandwiched between the cover member 48 and the stand 18.
An inclined flat surface portion 60 is provided on the tip side of the cover member 48 (see FIG. 10). Further, a guide plane 61 is provided on the tip end side of the inclined plane portion 60 so as to correctly position the treatment tool in the guide groove 62 of the upright table 18. A guide portion 63 is provided so as to be connected to the guide plane 61. The guide portion 63 is configured such that the treatment tool is attached to the tip portion 1
In order to prevent the treatment tool from colliding with the guide portion 63 and becoming incapable of protruding when protruding from the outer side of the guide groove 3, it is provided below the extension line of the guide groove 62 to the tip end side.

By the way, the cover member 48 is fixed by snap fit as will be described later, and therefore is made of a highly elastic plastic resin such as modified polyphenylene oxide or polyacetal. When the cover member 48 is molded with such a plastic resin, if the cover member 48 is thick, the plastic resin does not flow well into the mold, resulting in poor appearance. Therefore, in order to prevent this, the cover member 48 is positioned below the guide portion 63. A lightening portion 64 is formed on the inner surface of the cover member 48 so as to have a uniform thickness.

The tip cover 28 is also made of plastic resin such as polysulfone. However, since the tip end cover 28 is fixed, it is not necessary to form the tip end cover 28 with a material having special elasticity.
Is fixed by a snap fit, so it is necessary to form it with a material that is more elastic than the tip cover 28.

Further, the tip cover portion 27 is provided with the tip portion main body 13
As you can see at a glance that it is detachable from a,
The colors of the surfaces of the tip end cover 28 and the cover member 48 are changed. As a result, the washing person can immediately recognize that the tip cover portion 27 is detachable, and can perform the washing method separately from the conventional endoscope. That is,
The washing person removes the tip cover portion 27, which is heavily soiled, from the tip portion main body 13a so as to have a good washing property.
Can be washed. In this case, the cleaning work can be simplified and ensured by making the tip cover portion 27 disposable. Further, in order to make the washing person recognize that the tip cover portion 27 is removable, not only the color of the surface may be changed but also the gloss of the surface or the feel of the surface may be changed. .

As shown in FIG. 7, the upright stand 18 is in a set with the operation wire 58 connected thereto, and further, the insulating block 57 and the upright stand 18 are in a set by fitting and adhering the shaft 65. It has become. The entire assembly of the stand 18, the operation wire 58, and the insulating block 57 is integrally fixed to the cover member 48 by the boss 66 provided on the insulating block 57. In this case, the boss 66 is fitted into the hole 67 formed in the cover member 48 to thereby position the entire assembly of the stand 18, the operation wire 58, and the insulating block 57, and the boss 66 and the cover. The cover member 48 and the entire assembly are fixed by adhering the contact surface with the member 48. Although the shaft 65 and the upright stand 18 are integrated by adhering the fitting part 70 to each other, the fitting part between the insulating block 57 and the shaft 65 is not adhered to the upright stand with respect to the insulating block 57. 18 free rotations are ensured.

Further, as shown in FIG. 12, the shaft 65 and the upright stand 18 may be integrally formed, and the head 71 of the shaft 65 may be caulked by heat with the shaft 65 penetrating the insulating block 57. As a result, the upright table 18 is rotatable with respect to the insulating block 57 about the shaft 65. In the case of caulking by heat, the upright table 18 is made of a plastic resin such as polysulfone, modified polyphenylene oxide, or polyacetal. When the shaft 65 and the upright stand 18 are separate bodies, the upright stand 18 may be formed of either the plastic resin or the metal.

As shown in FIG. 7, the distal end portion of the operating wire 58 connected to the stand 18 is formed into a spherical shape by plasma processing, and is a fixed portion 68 having a diameter larger than the wire diameter. Further, the operation wire 58 is connected to the stand 18
Is bent so as to contact the side surface 69 of the.

The insulating block 57 is formed of an insulating plastic resin such as polysulfone or modified polyphenylene oxide so that the blade of a high-frequency knife as a high-frequency treatment tool does not touch the insulating block 57 and break due to sparks. Has been done. The insulating block 57 has a shape as shown in FIG.
It is provided with an arc-shaped guide portion 72 for restricting the traveling of the operation wire 58 attached to the upright table 18 to some extent. The side surface of the guide portion 72 is composed of a non-contact surface 73 and a guide surface 74 as shown in FIG. This is because when the contact surface between the upright stand 18 and the insulating block 57 becomes large, the surface accuracy of the upright stand 18 causes roughness or the like when the upright stand 18 is rotated.
This is because the feeling of operation becomes worse, so that the contact area is made as small as necessary to improve the feeling of operation.

On the base end side of the non-contact surface 73, a stopper 59 for restricting the standing position of the standing stand 18 is provided.
It is provided so as to project from 7. This stopper 59
The side surface 69 of the upright stand 18 projects to the extent that the rotation path of the side surface 69 is stopped halfway. When the insulating block 57 is formed in a projection shape to serve as the stopper 59, since the insulating block 57 is made of resin, the shape of the stopper 59 may be any as long as the rotation of the stand 18 can be restricted. It can also be shaped.

When the standing table 18 is erected on the insulating block 57 located on the base end side further than the stopper 59, the standing table 1
8 is provided with a curved surface 75 for forming an insertion passage. A forceps channel 76 is provided on the base end side of the curved surface 75.
Is open. The forceps channel 76 is formed by a forceps pipe 77 adhered or solder-fixed to the tip forming member 29. The tip forming member 29 and the tip side of the forceps pipe 77 are stepped by filling the stepped portion 92 with an adhesive. It is connected smoothly without it. by this,
Since dirt is less likely to collect in the step portion 92, dirt can be easily removed during brushing cleaning or fluid cleaning, and cleaning does not require labor.

A forceps channel tube 78 is connected to the base end of the forceps pipe 77. The forceps channel tube 78 is connected to the suction switching valve mechanism (not shown) of the suction button 17 described above. Further, the forceps channel tube 78 is branched at the above-mentioned forceps port portion 5 so that the treatment tool can be inserted into and removed from the forceps channel 76.

The opening 79 of the forceps channel 76 formed by the insulating block 57 gradually changes from a circular cross section as shown by the chain double-dashed line in FIG. It has changed to an elliptical shape. Such a change in cross section is caused by the curved surface 7 of the insulating block 57.
This is because 5 gradually moves to the tip side.

On the other hand, the operating wire 58, which is a part of the upright table 18, passes through the wire insertion portion 80 of the insulating block 57 as shown in FIG. 8 and enters the inside of the first forceps upright pipe 91 shown in FIG. It has been inserted.

Similar to the forceps pipe 77, the connecting portion of the first forceps upright pipe 91 with the tip forming member 29 is smoothly connected by filling the stepped portion 93 with an adhesive so as to eliminate the step. As a result, dirt is less likely to accumulate on the stepped portion 93, so that cleaning does not take time.

A forceps standing tube 94 made of ethylene tetrafluoride resin is adhered to the base end of the first forceps standing tube 91 so that the forceps standing tube 94 does not extend around the outer circumference of the forceps standing tube 94. A square forceps upright coil 95 is fitted. The tip of the forceps standing coil 95 is adhesively fixed to the first forceps standing pipe 91. Further, as shown in FIG. 13, the base end portion of the forceps standing tube 94 is heat-welded to the tip portion of the second forceps standing pipe 96 in a thermoformed state. Furthermore, the forceps standing coil 9
The base end of 5 is fixed to the second forceps standing pipe 96 and the solder 97.

The base end portion of the cover member 48 of the tip end cover portion 27 has a C-shaped deforming portion 51, as shown in FIGS. 9 (a) and 8. As shown in FIG.
Is bounded by two protrusions 98 engaged with the insulating block 57, and the portion 4 sandwiched by the two protrusions 98 is
9 (the portion opposite to the cutout portion 99) is fixed to the insulating block 57 by the adhesive as described above. The protrusion 98 is an adhesive pool forming a breakwater that prevents the adhesive from flowing out to the deforming portion 51 side.

When the tip cover portion 27 is attached to the tip portion main body 13a, the C-shaped deforming portion 51 is deformed as shown by the chain double-dashed line in FIG. 8 when it goes over the thick portion 50 of the tip portion cover 28. Then, the first tip cover 2
8 is engaged with the thin portion 52. An R chamfer 100 is provided on the outer surface of the C-shaped deforming portion 51 as shown in FIG.
This is because the living body is not damaged by the corners of the outer surface of the deformable portion 51. Further, the position of the notch 99 (see FIG. 8) of the deformable portion 51 is provided below the surface including the objective lens 31 and the illumination lens 30. As a result, when the deformable portion 51 is deformed, the tip end cover is present below the deformable portion 51, so that the deformable portion 51 is easily deformed, and the tip end portion main body 13a
It becomes easy to attach the tip cover portion 27 to the.

As shown in FIGS. 6 and 7, a taper portion 101 is provided at the boundary between the cover member 48 and the tip end cover 28.
Is provided. The taper portion 101 serves as a guide when the tip cover portion 27 is engaged with the tip portion main body 13a. Further, the taper portion 101 is naturally an inclined surface, and the length of the boundary portion between the cover member 48 and the tip end cover 28, which may be a leakage path of the high frequency current, is made longer than in the case where it is a vertical surface. As a result, high-frequency current can be prevented from leaking through the tapered portion 101, which is safe.

Further, as shown in FIG. 5, on the front end side, the taper portion 102 of the front end cover 28 and the cover member 4 are provided.
By overlapping the tapered portion 103 of No. 8 with each other, the gap between the engaging portions of the cover member 48 and the tip end cover 28 at the time of mounting is reduced. The fixing strength of the cover member 48 in the direction perpendicular to the plane of FIG. 1 is enhanced by engaging the protrusion 104 at the tip of the tip forming member 29 with the cover member 48. In addition, a corner chamfer 105 is formed at the corner of the protruding portion 104, so that dirt is unlikely to accumulate and labor for cleaning can be saved.

By the way, when the tip cover portion 27 shown in FIG. 9A is assembled to the tip portion main body 13a shown in FIG. 9B, the state shown in FIG. 4 is obtained. Further, as shown in FIG. 9B, the tip component member 29 has a flat surface corresponding to the upright stand 18, and thus has very good cleaning performance.

Next, the mechanism on the operating portion side for raising the stand 18 will be described. As shown in FIG. 14, the second
The forceps standing pipe 96 passes through the inside of the insertion portion 6 and reaches the vicinity of the operation wire outlet portion 200. Further, the operating wire 58 is pulled out from the standing wire outlet portion 200, and the proximal end portion of the pulled-out operating wire 58 and the standing operating rod 250 described later are connected via the connecting portion 201 (FIG. 2). reference). A protective cover 202 formed of an insulating plastic resin such as polypropylene or polyethylene is detachably attached to the standing wire outlet portion 200 exposed to the outside. As a result, the metal is not exposed to the outside even during the high frequency treatment, so that the operator can safely perform the treatment.

Next, the structure near the outlet of the standing wire will be described with reference to FIG. In the figure, reference numeral 203 denotes a mouthpiece of a flexible tube which constitutes the insertion portion 6, and a taper portion 204 provided on a base end side of the mouthpiece 203 is engaged with a taper portion 205a of a cylindrical body 205 which is a structure of an operation portion. Have been combined.
In this case, the taper portion 204 and the taper portion 205a are fixed by tightening the screw member 206. Further, a groove portion 207 is formed in the base 203, and by providing a seal member 208 in the groove portion 207, the taper portion 20 is formed.
Watertightness at 4,205a is secured.

Reference numeral 209 denotes a mounting member, and this mounting member 2
Bending prevention 210 is formed by applying rubber lining to 09. Further, a cover 211 made of plastic resin is adhesively fixed to the mounting member 209. That is, the mounting member 209, the bending stopper 210, and the cover 211 form a set.

Next, the assembly method will be described.

First, after the insertion portion 6 is put into the assembled state, the second
The forceps upright pipe 96 is cut into a predetermined length. At this time, the operation wire 58 is not inserted into the second forceps standing pipe 96. Then, the second forceps standing pipe 9
A tube 21 made of tetrafluoroethylene resin on the outer circumference of the base end of No. 6
The tube 2 is fitted with the tip of the tube 2 to be fixed by adhesion.
Tie the tip of 12 with thread and fix. Then, the other end of the tube 212 is cut into a predetermined length. Next, the coil 213 having a predetermined length is fitted on the outer circumference of the tip end portion of the tube 212, and the tip end portion of the coil 213 is fixed by the adhesive layer 214. In this state, the tube 212 and the base end side of the coil 213 are not fixed but left free.

Next, the step of docking the insertion section 6 and the operation section 3 is performed. First, with the internal components aligned and set at a predetermined position, the cylindrical body 20 which is the structure of the operating portion is formed.
The insertion portion 6 is inserted into the inside 5 from the tip portion 13 side so that the tapered surface 204 of the mouthpiece 203 and the tapered surface 205a of the cylindrical body 205 are engaged with each other and the both are tightened and fixed by the screw member 206. At this time, the tube 212 and the coil 213
The base end side (free end) of is present inside the cylindrical body 205.

Next, a grip 215 forming the grip portion 4
Is fitted from the distal end portion 13 side, and the grip 215 and the cylindrical body 205 are tightened and fixed by the screw member 216. Next, the first fixed cover 2 having a shape as shown in FIG.
With the seal member 219 fitted in the groove 218 of the groove 17, the first fixed cover 217 is fitted from the tip end 13 side, and the flange 217a having the groove 218 of the first fixed cover 217 is attached to the grip 215 and the cylindrical body 205. It is fitted in the gap between the and and is abutted against the end of the screw member 216 located here.

Since the through hole 235 of the fixed cover 217 and the through hole 236 provided in the cylindrical body 205 are circular cores, the regulating pin 220 is inserted from there through the space portion 237 of the fixed cover 217. Then, the rotation is stopped as shown in FIG. Therefore, the fixed cover 217 has the cylindrical body 205.
It is fixed so that it cannot rotate.

Next, the pipe 222 whose end is tapered is inserted into the opening 224 of the forceps raising pipe opening 223, and the water-tightly bonded assembly is attached to the first fixed cover 217.
Fit into the opening 221 of the. Further, a groove portion 225 is provided on the outer periphery of the forceps raising pipe opening body 223, and a seal member 226 arranged in the groove portion 225 is provided between the forceps raising pipe opening body 223 and the first fixed cover 217. Watertightness is secured. Further, the forceps raising pipe opening body 223 is provided with an extending portion 227 extending in the direction of the cylindrical body 205 to prevent the restriction pin 220 from coming off in the axial direction.

As shown in FIG. 15B, the portion of the extension portion 227 for preventing the restriction pin 220 from coming off is extended portion 2
The U-shaped pressing surface 238 of 27 is fixed without rattling.

Next, the tube 212 and the proximal end side (free end) of the coil 213 are pulled out from the elongated hole opening 228 of the cylindrical body 205 to the outside of the cylindrical body 205, and the tube 212 is water-tightly bonded to the distal end of the pipe 222. Along with fixing the bobbin. After that, the base end of the coil 213 is adhered to the tip end portion of the pipe 222, and an adhesive is applied over the thread to form an adhesive layer 229 to fix the base end of the coil 213.

Next, the second fixed cover 230 in which the seal member 232 is provided in the groove 231 is fitted from the tip end 13 side and abutted against the first fixed cover 217. This second fixed cover 230, as shown in FIG.
Since it is fitted over the entire circumference with the fixed cover 217, it is fixed in a non-rotatable manner. After that, the above-described subassembly including the mounting member 209, the bending stopper 210, and the cover 211 is fitted from the distal end portion 13 side, and the mounting member 2
09 and the cylindrical body 205 are screwed with each other by a screw portion 233, so that the entire assembly is pressed and fixed in the axial direction. At this time, the watertightness between the second fixing member 230 and the cylindrical body 205 is secured by the seal member 234.

By the way, in FIG. 2, when the upright table operating lever 19 provided on the operating section 3 is moved, the upright operating rod 250 advances and retreats, and the displacement amount thereof finally reaches the distal end portion 13 via the connecting portion 201. Reported to the stand 18. Less than,
Such a drive mechanism will be described with reference to FIGS. 17 to 22.

The upright operating lever 19 is made of a plastic resin such as modified polyphenylene oxide. Therefore, considering that a relatively large force is applied, the upright base operation lever 19 is sandwiched between the plate 251 and the lever main body 252 and fixed by the screw member 255. The lever body 252 is fixed to the rotating body 253 with a mounting screw 254. Also, the rotating body 2
An annular groove 256 is formed on the outer periphery of 53. Then, a seal member 257 is provided in the annular groove 256 in order to ensure watertightness and to provide rotation resistance.

As shown in FIGS. 17 and 18,
A first link 259 that constitutes the connecting portion 258 is fixed to the rotating body 253. As shown in FIG. 18, the first link 259 is formed of a metal plate body, and has an attachment portion 259b having a plurality of attachment holes and the attachment portion 25.
9b and a connecting portion 259a extending from 9b. Mounting part 2
59b is fixed to the rotating body 253 by a plurality of mounting screws 262. Further, the connecting portion 259a is connected to the pivot pin 26.
It is rotatably fixed to the second link 264 by 3.

In addition, as shown in FIG.
Is an O-ring 267 in the mounting hole 266 of the casing 265.
It is rotatably supported from the outside by a tightening ring body 268 which is fixed via. Further, the rotating body 253 is fixed to the fixing member 269 by the screw member 270.

On the other hand, on the other end side of the second link 264,
A link coupling member 272 is accommodated inside a partition member 271 (see FIG. 19) having a U-shaped cross section so as to be movable in the axial direction. As shown in FIG. 19, the link connecting member 272 is automatically and rotationally connected to the second link 264 via the pivot pin 273. The pivot pin 273 is the second
Is inserted through both the link 264 and the link coupling member 272, and the C ring 274 prevents the C ring 274 from coming off.

As shown in FIG. 17, the link connecting member 27
An L-shaped connecting member 275 is provided on the tip side of the spring washer 2
It is fixed by screws with screws 286. Further, a guide body 277 formed of a plastic resin such as polyacetal having good slipperiness is provided below the link coupling member 272. In this case, since the guide body 277 has good slidability, the operation of the link coupling member 272 is smooth and the feeling of operation is good. The guide body 277 is fixed to the base plate 278 of the operation portion 3 by a screw member 279, and the screw portion 28 of a locking plate 280 for locking a cover member 281 described later.
2 by screwing the fixing screw 283 into the partition wall member 2
71 and the base plate 278 are sandwiched, the cover member 2
It is fixed to 81.

As shown in FIG. 20, L of the connecting member 275 is
A convex portion 284 formed by press working at an angle different from the bending direction is provided in the bent portion in order to improve bending rigidity. Since this connecting member 275 projects beyond the outer surface of the grip 215, during assembly, the grip 215 is tightened and fixed by the screw member 216 as described in FIG.
The connecting member 275 is inserted from 85 and fixed by the screw 286.

As shown in FIG. 21, the grip opening 285 has a substantially rectangular shape. A cover member 281 is attached so as to fit in the grip opening 285. As shown in FIGS. 17 and 22, a seal member 287 is provided at a portion of the cover member 281 corresponding to the grip opening 285. The cover member 281 prevents the protrusion piece 288 on the base end side shown in FIG. 17 from slipping in the grip opening 285 into the grip 215 in the vertical direction. further,
The tip of the cover member 281 is fixed to the above-mentioned locking plate 280 with a screw 289. This screw 289
Is screwed into the threaded portion 290 of the locking plate 280 while penetrating the grip 215. The screw 289 is shown in FIG.
Two cover members 281 are provided as shown in FIG.
The gap between the screw and the screw 289 is filled with a silicon-based adhesive 291. Since the cover member 281 made of plastic resin and the like are tightened by the screw 289, the screw 289 is tightened with a constant force in consideration of the tightening torque.

On the other hand, a through hole 292 is formed in the portion of the cover member 281 into which the upright operation rod 250 is inserted and removed. The diameter of the through hole 292 is substantially equal to the diameter of the upright operating rod 250 so that the upright operating rod 250 is substantially fitted into the through hole 292 and does not rattle. A cylindrical hole 293 coaxial with the through hole 292 and having a diameter larger than that of the through hole 292 is formed on the tip side of the through hole 292. Further, a screw portion 294 is provided on the tip side thereof. And
A seal member 295 is fitted in the cylindrical hole 293, and a pressing member 296 that presses the seal member 295 in the axial direction.
Is screwed into the screw portion 294. The pressing member 2
A silicone adhesive is applied to the portion where 96 is screwed.

After the cover member 281 is attached as described above, the upright operation rod 250 is inserted through the opening 297 of the holding member 296, and the connecting member is connected to the screw portion 298 provided at the base end of the upright operation rod 250. Screw 275 together. In this state, when the stand operating lever 19 is rotated, the link connecting member 272 moves back and forth, and the standing operating rod 250 moves back and forth. As shown in FIG. 17, a stopper 299 is fixed by a screw 300 in order to regulate the movement amount of the link coupling member 272. Next, another structure of the forceps upright drive device is shown in FIG. This structure is different from the structure in FIG. 17 in the structure around the standing operation rod 250.

In this structure, the connecting portion 239 of the standing operation rod 250 and the connecting member 275 is as shown in FIG. 23 (b). That is, the small diameter portion 240 of the upright operation rod 250 has the U-shaped notch 24 of the connecting member 275.
1 and the flange 242 has a large diameter, the small diameter portion 240 does not come off the notch 241. Also, regarding the vertical dropout, the flange 242
The standing operation rod 2 from the gap X between the cover member 281 and the cover member 281.
Since the step size y between the flange 242 and the small diameter portion 240 of 50 is larger, it is prevented from coming off in the upward direction.

A seal member 243 made of silicon rubber is provided on the cylindrical surface 293 of the cover member 281 of the upright operation rod 250. The seal member 243 has a substantially hollow tubular shape. Further, the convex portion 244 is provided at two locations on the inner surface of the seal member 243.
Thus, the water tightness with the rod 250 is secured. Further, the tip end side is pressed by a pressing member 296.

At the time of assembly, after inserting the seal member 243 into the cover member 281 and fixing it with the pressing member 296, the upright operation rod 250 is inserted, and as shown in FIG. 24, the protruding piece 288 is attached to the grip opening of the grip 215. The small diameter portion 290 of the upright operating rod 250 is adjusted so as to engage with the notch 241 of the connecting member 275, and the screw 289 is moved as indicated by an arrow in the drawing.
Tighten with a constant torque.

According to the above construction, the standing operation rod 250 does not come off in the axial direction after the assembly. Further, since the seal member 243 is lengthened to support at two points, the core is easily brought out, and the rubber member makes contact, so that the upright operation rod 2 is supported.
The surface of 50 is less likely to be scratched, and poor watertightness is reduced.

Next, the connecting portion 201 will be described with reference to FIGS. 1 and 3. As shown in FIG. 1B,
A flange portion 301 is provided on the tip side of the standing operation rod 250. A small diameter portion 302 is provided at the base end of the flange portion 301, and a large diameter portion 303 is provided at the base end of the small diameter portion 302. A connecting member 304 is detachably provided at the tip of the standing operation rod 250.

As shown in FIG. 3, the standing operation rod 250
At the base end side portion of the connecting member 304 that fits into the small diameter portion 302 and the flange portion 301, cutout portions 305a and 305b cut out in a horseshoe shape are provided, whereby the standing operation rod 250 is formed. From the side of the connection member 3
It is possible to attach and detach 04. Further, the cap 306 for holding the connection state between the upright operation rod 250 and the connecting member 304 has the upright operation rod 25.
It is provided on the outer periphery of the connecting portion between 0 and the connecting member 304. The cap 306 is made of a highly elastic plastic material such as polyacetal, polyethylene, or polypropylene, and has a protrusion 307 on the inner periphery on the tip side thereof. By engaging the protrusion 307 with the recess 308 provided on the outer periphery of the connecting member 304, the cap 3
At the same time as 06 positioning is performed, a click feeling is provided.

With the cap 306 moved to the position shown by the chain double-dashed line in FIG.
0 with the connecting member 304, and then the cap 30
When 6 is moved to the position indicated by the solid line, the standing operation rod 25
0 large diameter portion 303 and inner peripheral engagement portion 309 of cap 306
And the upright operation rod 250 is fixed.

As described above, since the cap 306 is made of plastic resin, when the cap 306 is fitted onto the outer periphery of the connecting member 304, the cap 306 is pushed in by utilizing the width of the elastic region, so that the state shown in FIG. Is located in. In this case, in order to improve the assemblability, the connecting member 3
A tapered surface 311 is provided on the outer periphery of the base end portion 04. This is for facilitating the cap 306 to spread when the cap 306 is forcibly fitted onto the outer periphery of the connecting member 304.

On the other hand, a fixing screw 312 is provided on the tip side of the connecting member 304 so that the operating wire 58 can be fixed at any position. The operation wire 58 shown by a chain double-dashed line indicates that the insertion portion 6 can be adjusted even if the length of the insertion portion 6 varies from one solid to another, and the space portion 313 is provided for that purpose. ing.

Next, the relative positions of the operation wire 58, the connecting portion 201 and the rod 250 in the wire outlet portion 200 will be described.

The operating wire 58, the connecting portion 201 and the standing operating rod 250 are positioned on a substantially straight line as shown in FIG. The forceps opening 5 is located in the middle of the wire outlet 200 and the grip 215.

As a result, the displacement amount from the erection drive device is converted into a linear reciprocating motion, and the displacement amount transmitted to the rod is operated by the operating wire 58, the connecting portion 201 and the erection operating rod 250.
There is no loss at the joint between the and, and the operating wire 58 can move back and forth without buckling. As described above, the endoscope 1 according to the present embodiment includes the standing drive device, the standing operation rod 2, and the standing operation rod 2.
The amount of displacement transmitted to 50 surely raises the stand 18 at the tip.
Since it is transmitted to, the response is good and the operability is good. Further, since the path from the rod 250 to the operation wire 58 is made substantially linear, the operation wire 58 does not buckle and the durability is improved.

Further, since the part that reciprocates is on the tip side (lower part) of the grip part, it does not interfere with the operation, does not impair the operability, and does not require any trouble during cleaning. Further, the operation wire 58 is detachably attached to the tip end cover portion 27.
Since it comes off together with it, the inside of the pipe into which the operation wire 58 is inserted can be easily washed.

25 and 27 show the second embodiment of the present invention. The first embodiment is the rod 250.
The reciprocating direction of is different. The wire outlet portion 200 is shown in FIG.
As shown in FIG. 5, the pipe 222 is inclined at the portion of the forceps raising pipe opening 223. Others are the same as those in the first embodiment.

On the other hand, in the standing drive device, the rod 250 is inclined as shown in FIG. This rod 25
As shown in (b) of FIG.
A flat surface portion 350 is formed by cutting the cylindrical surface of 0, and a hole 351 is provided through the flat surface portion 350. The rod 250 is connected to the third link member 352 by a fixing pin 353, and the rod 250 is rotatably fixed. Further, the fixing pin 353 is coupled to the third link member 352 by the screw portion 354. It should be noted that a silicone adhesive is applied to the screw portion 354 to prevent loosening during assembly.

The third link member 352 is the cylindrical body 3
It is fixed to the small-diameter cylindrical portion 356 of 55 by adhesion.
Further, the tubular body 355 has a fitting hole 357, and the link coupling member 272 and the spring washer 276 as well as the screw 286.
Fitting pin 3 erected on the substrate 259 fixed by
It is fitted with 58 and is fitted so as to be movable in the vertical direction as shown by the arrow in FIG. The fitting pin 358 is fixed by a screw 360, and a silicone adhesive is also applied to the screw 360 as a loosening stopper.

Next, the assembling method will be described. Cover member 28
The seal member 243 is inserted into the No. 1 and is fixed by pressing with the pressing member 296. After that, the rod 250 is inserted, and the third link member 352 and the tubular body 355 integrated with the third link member 352 are fixed by the fixing pin 353 to form a group. Next, the fitting pin 358 is mounted on the board 359 fixed to the link coupling member.
Screw in. Then, the fitting pin 358 and the fitting hole 35
7, the cover member 281 is fitted and fixed as in the first embodiment.

Next, the relative positions of the connecting portion 201 and the rod 250 in the standing wire outlet portion 200 will be described. The standing wire 58, the connecting portion 201, and the rod 250 are inclined, but their axes are straight lines. Since the outlet of the standing wire is inclined, workability is improved when connecting the tube and the coil.

Further, although the stroke is given by moving the upright operating lever, the stroke increases as much as the inclination as shown in FIG. 26 (a). Assuming that the stroke is 1 as shown in FIG. 26 (c), the hypotenuse is 1 / co
s θ. Since 0 ≦ cos θ ≦ 1, l / cos θ ≧ l, and the hypotenuse becomes longer. Therefore, the stroke becomes large. Therefore, a large displacement amount of the rod can be obtained with a small stroke.

[0092]

As described above, according to the endoscope of the present invention, the cleanability and operability are improved. That is, the amount of displacement transmitted from the standing drive device to the transmission rod is surely transmitted to the standing stand at the tip portion, so that the response is good and the operability is good. Further, since the path from the transmission rod to the operation wire is made substantially linear, the operation wire is not buckled and the durability is improved. Moreover, since the operation wire and the transmission rod are detachable, the shearing property is improved.

[Brief description of drawings]

FIG. 1A is a schematic view of the vicinity of a connecting portion between an operation wire and a transmission rod in an endoscope according to a first embodiment of the present invention,
(B) is sectional drawing of the connection part of an operation wire and a transmission rod.

FIG. 2 is an overall configuration diagram of the endoscope of the first embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a plan view of the distal end portion of the endoscope showing the first embodiment of the present invention.

5 is a cross-sectional view taken along the line BB of FIG.

6 is a cross-sectional view taken along the line CC of FIG.

7 is a cross-sectional view taken along the line DD of FIG.

8 is a cross-sectional view taken along the line EE of FIG.

FIG. 9 is a plan view showing a state in which a tip cover portion is removed from a tip portion main body.

10 is a cross-sectional view taken along the line FF of FIG.

FIG. 11 is a perspective view of a tip cover of the tip body.

FIG. 12 is a cross-sectional view showing an example of a connection between a stand and an insulating block.

FIG. 13 is a cross-sectional view showing a connection state at the tip portion of the forceps standing pipe.

14 is a cross-sectional view showing the internal structure around the operation wire outlet portion 200. FIG.

15 (a) is a cross-sectional view taken along the line GG of FIG.
(B) is sectional drawing which follows the HH line of (a).

16 is a sectional view taken along the line FF of FIG.

FIG. 17 is a cross-sectional view of a main part of an operation wire drive mechanism.

FIG. 18 is a plan view of FIG. 17 viewed from the I direction.

19 is a cross-sectional view taken along the line KK of FIG.

20A is a perspective view of an L-shaped bent portion of the connecting member of FIG. 17, and FIG. 20B is a sectional view taken along line LL of FIG.

FIG. 21 is a plan view of the vicinity of a grip opening.

22 is a sectional view taken along the line JJ of FIG.

23A is a cross-sectional view showing another structure of the forceps upright drive device, and FIG. 23B is a cross-sectional view taken along line MM of FIG.

FIG. 24 is an explanatory diagram showing a method of assembling the forceps upright drive device of FIG. 23.

FIG. 25 is a cross-sectional view showing the internal structure around the operation wire outlet portion 200 of the endoscope showing the second embodiment of the present invention.

FIG. 26A is a sectional view of a forceps upright drive device for an endoscope showing a second embodiment of the present invention, and FIG. 26B is a PP view of FIG.
A sectional view taken along the line, (c) is a vector diagram showing the relationship between the inclination angle of the rod and the stroke.

FIG. 27 is a schematic view of the vicinity of the connecting portion between the operation wire and the transmission rod in the endoscope of the second embodiment of the present invention.

[Explanation of symbols]

1 ... Endoscope, 58 ... Operation wire, 250 ... Transmission rod,
224 ... Opening part.

[Procedure amendment]

[Submission date] September 8, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

By the way, since the operation wire for raising the treatment instrument stand is inserted into the wire insertion pipe provided in the insertion portion of the endoscope, the inside of the wire insertion pipe is cleaned. When performing the cleaning, the operation wire was an obstacle and it took time to clean.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

However, since the flexible tube corresponding to the wire insertion pipe draws a long loop in the proximal operation portion of the endoscope, even if the operation wire is removed from the wire insertion pipe, the above-mentioned operation is eventually possible. It took a lot of time to clean the flexible tube.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

However, since the wire operating body performs the rotational movement of the operating lever through the pin, the frictional resistance is large and the operability is poor. Moreover, it is not possible to remove also the operation wire, also it takes time for cleaning the wire insertion pipe, numerous uneven portions in the periphery of the operation lever of the operation unit side exist
Very cleanability Mashimashi was poor.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

As shown in FIG. 5, the objective lens system, which is the other optical system, has a roof prism below the objective lens 31.
Arm 43 is disposed, the imaging unit 45 having an objective lens group 44 is provided in a substantially axial direction of the insertion portion 6. The image pickup unit 45 is fixed with screws 46 as shown in FIG. The screw 46 is adhered with a silicone-based elastic adhesive 47, and the elastic adhesive 47 is also filled in the recessed portion of the screw 46 after tightening.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0058

[Correction method] Change

[Correction content]

Since the through hole 235 of the fixed cover 217 and the through hole 236 provided in the cylindrical body 205 are concentric circles , the space portion 237 of the fixed cover 217 is there.
The regulating pin 220 is further inserted to stop rotation as shown in FIG. Therefore, the fixed cover 217 is provided in the cylindrical body 20.
It is fixed non-rotatably to 5.

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 14

[Correction method] Change

[Correction content]

FIG. 14

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 25

[Correction method] Change

[Correction content]

FIG. 25

Claims (1)

[Claims] 1. A treatment instrument stand that is arranged at a distal end side portion of an insertion portion to change a projecting direction of the treatment instrument and is operated to be erected via an operation wire by an operation of an operation portion on a hand side, An endoscope including a guide pipe that guides an operation wire toward the operation unit side, the operation unit of the guide pipe having a transmission rod that transmits an operation force in the operation unit to the operation wire as a traction force. The transmission rod is arranged so that the axis of the opening on the side and the axis of the transmission rod are located on substantially the same straight line, and the operation wire and the transmission rod led out from the opening are detachable. An endoscope characterized by being connected to.