JP3279390B2 - Endoscope - Google Patents

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 forceps erecting device.

[0002]

2. Description of the Related Art There is known an endoscope provided with a forceps erecting table for changing a projecting direction of a treatment tool at a distal end side of an insertion portion.
The forceps erecting base is operated by operating a forceps erecting wire connected thereto by an erecting operation device in a hand operation unit.

Generally, medical endoscopes such as a gastroscope and a duodenal scope perform observation and treatment of an affected part by inserting an insertion portion into a body cavity of a patient. In this case, forceps are applied while observing the affected part. In order to perform biopsy tissue collection and treatment using the forceps, it is necessary to bend and displace the forceps so as to face a desired diseased part. In such a case, the forceps erecting base and the erecting operation device are required. Will be done.

Conventionally, when the standing tool is raised to change the direction of projection of the treatment tool, the treatment tool can be moved forward and backward by sandwiching the treatment tool between the standing table and the distal end member of the endoscope. In order to prevent the stand from disappearing, a stopper for regulating the standing operation of the stand is provided.

[0005]

Problems to be Solved by the Invention
In Japanese Patent Application Publication No. 4 (1999) -1995, the stopper for restricting the erecting operation of the erecting table is provided on the distal end component of the endoscope.

However, in this configuration, a large number of uneven portions are present in the vicinity of the portion where the stopper is formed, and even if these are washed with a dedicated brush or the like at the time of cleaning after the case, the shape is complicated. For this reason, there is a problem that the cleaning is troublesome. Also, JP-A-4-31.
Japanese Patent No. 4439 discloses an endoscope in which a distal end cover in a distal end component can be attached and detached, and an upright stand and a stopper can be exposed in an easy-to-clean state.

However, in this case, the stopper is also provided on the distal end component (the upright stand shown by the two-dot chain line in FIG. 6 is in contact with the stopper of the distal end component). Many irregularities are present in the vicinity of the part to be formed, and cleaning takes time and is not efficient.
won.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an endoscope capable of restricting the erecting operation of an erecting stand and having good cleaning properties. .

[0009]

In order to solve the above problems SUMMARY OF THE INVENTION The present invention has a universal tip cover removably attached to the distal portion of the insertion portion, and rotatable instrument raiser member, pulling This
The operation tool for rotating and erecting the treatment instrument erecting base by
And an endoscope having the ear disposed on the distal end side of the insertion section.
And pulls the operation wire to raise the treatment instrument upright.
When the treatment instrument stand is turned upright, the rotation of the treatment instrument stand is regulated at a predetermined position.
That the stopper is provided on the tip cover.
And features.

[0010]

According to the above construction, when the distal end cover is removed from the distal end of the endoscope, the distal end of the endoscope has no complicated uneven shape for the stopper.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 23 show a first embodiment of the present invention. As shown in FIG. 2, the endoscope 1 of the present embodiment
, An endoscope main body is constituted by the operation unit 3, the grip unit 4, and the insertion unit 6. The operation unit 3 is provided with a switch unit 2 and a universal cord 7 is connected thereto. In addition, a forceps opening 5 is provided on the distal end side of the gripping portion 4. Further, a connector 8 is provided at the end of the universal cord 7.

The switch section 2 is provided with switches 9 for performing various functions, and these switches 9 can remotely freeze or release an image.

The operating section 3 has an up / down angle knob 11 for bending the bending section 10 provided on the distal end side of the insertion section 6 in the up / down direction, and a right / left angle knob 12 for bending in the left / right direction. The distal end 13 connected to the distal end of the bending portion 10 can be moved in a desired direction by rotating these angle knobs 11 and 12.

Each of the angle knobs 11 and 12 has a vertical engagement lever 14 and a left and right engagement lever 15 as brake mechanisms that can increase the rotational resistance and stop the bending state of the bending portion 10 halfway. Is provided.

The operation unit 3 includes an air / water supply button 16 for performing an air / water supply operation for discharging gas or liquid from the tip 13, and a suction button 17 for performing a suction operation from the tip 13. Is provided. Further, the operation unit 3
The treatment instrument upright table 1 provided at the distal end portion 13 and described later
An upright operating lever 19 for operating the upright 8 (hereinafter simply referred to as the upright 18) is provided coaxially with the rotation axes of the up-down angle knob 11 and the left-right angle knob 12.

Inside the universal cord 7, a light guide fiber 39 (see FIG. 3), cables (not shown) and various tubes are incorporated. And
The universal cord 7 is connected to a light source device 20 via a connector 8 at the tip. Further, the connector 8 is connected to the water supply tank 22 via a tube, and water from the water supply tank 22 is passed through the air supply / water supply tube 33 (see FIG. 3) provided from the universal cord 7 to the insertion section 6 so as to be connected to the distal end 13. Water is supplied to

A suction pipe (not shown) having one end opened at the distal end portion 13 and the other end opened at the connector section 8 is opened and closed by a suction switching valve (not shown) attached to the suction button 17. Is controlled. And
The suction pipe is connected to the suction tube 2 on the connector section 8 side.
3 is connected to a suction bin 24 which is connected to a suction pump.

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

Next, the distal end 13 provided at the distal end of the insertion section 6 will be described. As shown in FIG. 1 or FIG.
The distal end portion 13 includes a distal end portion main body 13a made of a distal end component 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 29 forming tip body 13a
An illumination lens 30 and an objective lens 31 are provided on the tip side of the lens. A nozzle 3 is provided on the base end side of the objective lens 31.
The two tips are 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. 3, and the base end of the air / water supply tube 33 is connected to an air / water supply button (not shown) of the operation unit 3. It is connected to a switching valve. By operating the air / water button 16, water or air is supplied to the nozzle 3.
2 can be spouted, thereby removing dirt on the surface of the objective lens 31.

The nozzle 32 is adhesively fixed to the tip component 29, and the gap between the nozzle 32 and the nozzle cover 28a of the tip cover 28 of the tip body 13a described later is filled with an adhesive 34. This is configured so that dirt does not enter the distal end portion 13.

A distal end of a bending piece 35a for controlling the bending operation of the bending portion 10 is fixed to a proximal end of the distal end component 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 periphery of the curved tube portion 35.

The distal end side of the curved rubber 37 is wound and fixed by a thread 38, and the fixing strength is increased by applying an adhesive on the fixed portion. In this bonding operation, since the annular portion 28b of the distal end cover 28 forms a wall over the entire periphery at the distal end side of the bonding portion, the adhesive does not flow out, and workability is improved.

On the other hand, a light guide fiber 39 is disposed below the illumination lens 30 provided on the distal end body 13a in a substantially L-shape. Light guide fiber 39
Since only a plurality of fibers are fixed with an adhesive, the fixing strength of the light guide fiber 39 is increased by fixing the distal end portion of the light guide fiber 39 with a screw 41 via a fixing plate 40 as shown in FIG. I have. In addition, the presence of the fixing plate 40 prevents the screw 41 from being directly screwed into the fiber that is a glass fiber while rotating, 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 portion of the 9 by an adhesive.

As shown in FIG. 3, the objective lens system is other optics, Dahapurizu 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. This imaging unit 45 is fixed with screws 46 as shown in FIG. The screw 46 is adhered with a silicon-based elastic adhesive 47, and the elastic adhesive 47 is also filled in the recess after the screw 46 is tightened.

The tip cover 28 is prevented from falling off by a pin 55 as shown in FIG. This pin 55
Is fixed to the tip component member 29 with an adhesive, and the adhesive 56 is also filled in a concave portion formed between the pin 55 and the tip cover 28. At the time of assembling the distal end cover 28 and the distal end member 29, an adhesive for preventing air bubbles from entering the inner surface of the distal end cover 28 and the outer surface of the distal end member 29 on which the distal end cover 28 is covered is applied. Perform bonding work. At the time of this bonding operation, an adhesive is applied to every corner of the contact surface between the tip cover 28 and the tip component 29 while wiping off the adhesive that has protruded to the outside, so that a gap is formed between the contact surfaces. It is in a state of being completely adhered so as not to be brought into contact, so that dirt does not enter the tip portion 13.

As shown in FIGS. 4, 5 and 9, the distal end of the distal end cover 28 has a shape in which a circle is cut off by about 3/4. As shown in FIG. 3, a nozzle cover 28 a that covers the nozzle 32 is formed on the rear end side of the front end cover 28. In addition, below the nozzle cover 28a,
A thick portion 50 is formed for strengthening the hook of the distal end cover portion 27 detachably attached to the distal end portion body 13a with the cover member 48. A thin portion 52 is formed on the base end side of the thick portion 50 so that the C-shaped deformed portion 51 of the cover member 48 is engaged.

The outer surface of the thick portion 50 is provided with a round chamfer 53 so as not to damage the living body. This round chamfer 53 makes it difficult for dirt to collect on the corners of the outer surface of the thick portion 50, and thus the cleanability of this portion is improved.
Similarly, an R-chamfer 53 is also applied to the stepped portion of the thin portion 52 from the thick portion 50, thereby improving the cleaning performance.

An annular portion 28b is formed in a ring shape on the base end side of the thin portion 52. This annular portion 28b
As described above, since the curved rubber 37 becomes a wall when the curved rubber 37 is tightened and fixed with the thread 38 and the adhesive is applied from above, the bonding work becomes easy.

Next, the distal end cover 27 which is detachably attached to the distal end body 13a will be described. As shown in FIG. 7A, the front end cover portion 27 includes an upright stand 18 and an insulating block 5 inside a cover member 48 as an outer frame.
7 is provided. Standing stand 18
Is connected to the tip of an operation wire 58 for erecting the erecting table 18.

The distal end side of the cover member 48 has a rounded shape as shown in FIG. 8 and a cross-sectional shape having a notch of about 3/4 of a circle as shown in FIG.
In addition, an inclined plane portion 60 is provided on the tip side of the cover member 48 so that a thin treatment tool is not pinched between the cover member 48 and the stand 18 when the stand 18 is raised (FIG. 8). In addition, a guide plane 61 is provided on the distal end side of the inclined plane section 60 so as to correctly position the treatment tool in the guide groove 62 of the upright table 18. A guide 63 is provided so as to be connected to the guide plane 61. The guide portion 63 is provided below the extension of the guide groove 62 toward the distal end portion in order to prevent the treatment instrument from hitting the guide portion 63 and becoming unable to protrude when the treatment instrument projects outside from the distal end portion 13. It is provided on the side.

Since the cover member 48 is fixed by snap fitting as described later, it is formed of a plastic resin having high elasticity 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. A lightening portion 64 is formed on the inner surface of the cover member 48 to be uniform.

The tip cover 28 is also formed of a plastic resin such as polysulfone. However, since the distal end cover 28 is fixed, it is not necessary to form the distal end cover 28 with a special elastic material.
Since it is fixed by snap fit, it is necessary to be formed of a material having a higher elasticity than the tip cover 28. Also, the colors of the surfaces of the distal end cover 28 and the cover member 48 are changed so that the distal end cover portion 27 is detachable from the distal end body 13a at a glance.
Thus, the cleaning person can immediately recognize that the tip cover portion 27 is detachable, and can perform the cleaning method separately from the conventional endoscope. That is, the cleaner cleans the tip cover portion 27, which is heavily soiled, with the tip portion main body 13a.
By removing the front end body 13a or the front end cover portion 27, the state of good cleaning performance can be obtained by removing the front end main body 13a or the front end cover portion 27. In this case, simplification and reliability of the cleaning operation can be achieved by disposing the tip cover portion 27 as disposable. In addition, the tip cover 27
In order for the washer to recognize that the
Not only change the color of the surface, but also the gloss of the surface,
Alternatively, the feel of the surface may be changed.

As shown in FIG. 5, the stand 18 is formed as a set with an operation wire 58 connected thereto, and the insulating block 57 and the stand 18 are formed into a set by fitting and bonding a shaft 65. It has become. The entire assembly including the upright 18, the operation wire 58, and the insulating block 57 is integrally fixed to the cover member 48 by a boss 66 provided on the insulating block 57. In this case, by fitting the boss 66 into the hole 67 formed in the cover member 48, the entire assembly including the upright base 18, the operation wire 58, and the insulating block 57 is positioned, and the boss 66 and the cover By bonding the contact surface with the member 48, the cover member 48 and the entire assembly are fixed. Although the shaft 65 and the stand 18 are integrated by bonding the fitting portion 70, the fitting portion between the insulating block 57 and the shaft 65 is not bonded, and 18 are freely rotated.

Further, as shown in FIG. 10, the shaft 65 and the stand 18 may be integrally formed, and the head 71 of the shaft 65 may be caulked by heat while the shaft 65 passes through the insulating block 57. As a result, the upright stand 18 becomes rotatable about the shaft 65 with respect to the insulating block 57. In the case of caulking by heat, the stand 18 is formed of a plastic resin such as polysulfone, modified polyphenylene oxide, or polyacetal. When the shaft 65 and the stand 18 are separate bodies, the stand 18 may be formed of either the plastic resin or the metal.

As shown in FIG. 5, the distal end of the operation wire 58 connected to the stand 18 is formed into a spherical shape by plasma processing, and forms a fixed portion 68 having a diameter larger than the wire diameter. The operation wire 58 is connected to the standing stand 18.
Is bent so as to be in contact with the side surface 69.

The insulating block 57 is formed of an insulating plastic resin such as polysulfone or modified polyphenylene oxide, for example, so that the blade of a high-frequency knife as a high-frequency treatment tool does not touch the insulating block 57 and is cut by sparks. Have been. The insulating block 57 has a shape as shown in FIG. 8, and includes an arc-shaped guide portion 72 for restricting the movement of the operation wire 58 attached to the standing stand 18 to some extent. The side surface of the guide portion 72 is constituted by a non-contact surface 73 and a guide surface 74 as shown in FIG. This is because, when the contact surface between the stand 18 and the insulating block 57 becomes large, the surface accuracy causes roughness when the stand 18 is rotated,
This is because the operation feeling is deteriorated, and the contact area is reduced to the minimum necessary to improve the operation feeling.

On the base end side of the non-contact surface 73, a stopper 59 for regulating the standing position of the stand 18 is provided.
7 and is provided. This stopper 59
It protrudes to the extent that the rotation trajectory of the side surface 69 of the stand 18 is stopped halfway. When the insulating block 57 is formed in the shape of a protrusion and serves as the stopper 59, since the insulating block 57 is made of resin, the shape of the stopper 59 may be any value within a range in which the rotation of the upright stand 18 can be restricted. It can also be shaped.

When the stand 18 is erected on the insulating block 57 further proximal to the stopper 59, the erected stand 1
8 is provided with a curved surface 75 for forming an insertion passage. At the proximal end of the curved surface 75, a forceps channel 76 is provided.
Is open. The forceps channel 76 is formed by a forceps pipe 77 bonded or soldered to the distal end component 29. The distal end of the distal end component 29 and the distal end of the forceps pipe 77 are filled with an adhesive in the stepped portion 92 to form a step. It is connected smoothly without it. by this,
Since dirt is less likely to accumulate on the step portion 92, dirt can be easily removed during brushing cleaning or fluid cleaning, and there is no need for cleaning.

A forceps channel tube 78 is connected to the proximal end of the forceps pipe 77. The forceps channel tube 78 is connected to a suction switching valve mechanism (not shown) of the suction button 17 described above. Further, the forceps channel tube 78 branches off at the aforementioned forceps opening 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 a two-dot chain line in FIG. It has shifted to an oval shape.
Such a change in the cross section is caused by the curved surface 75 of the insulating block 57 gradually shifting to the distal end side.

On the other hand, the operation wire 58 assembled with the stand 18 passes through the wire insertion portion 80 of the insulating block 57 as shown in FIG. 6 and passes through the first forceps upright pipe 9 shown in FIG.
1 is inserted inside.

As in the case of the forceps pipe 77, the connection between the first forceps upright pipe 91 and the distal end component member 29 is smoothed by filling the step 93 with an adhesive to eliminate the steps. As a result, dirt is less likely to accumulate on the step portion 93, so that cleaning is not required.

A forceps upright tube 94 made of tetrafluoroethylene resin is adhered to the base end of the first forceps upright pipe 91, and the forceps upright tube 94 does not extend around the outer periphery of the forceps upright tube 94. A square forceps standing coil 95 is fitted. The tip of the forceps upright coil 95 is adhesively fixed to the first forceps upright pipe 91. As shown in FIG. 11, the base end of the forceps upright tube 94 is heat-welded to the distal end of the second forceps upright pipe 96 in a thermoformed state. Further, the forceps standing coil 9
The base end of 5 is fixed by a second forceps upright pipe 96 and solder 97. Cover member 48 of tip cover 27
As shown in FIG. 7A and FIG.
It has a deformed portion 51 in the shape of a circle. As shown in FIG. 6, the deformed portion 51 is bounded by two protrusions 98 engaged with the insulating block 57, and a portion 49 (a notch 99) sandwiched between the two protrusions 98. Is fixed to the insulating block 57 by the adhesive as described above. The projecting portion 98 is an adhesive pool that forms a breakwater that does not allow the adhesive to flow toward the deformable portion 51.

When the tip cover 27 is attached to the tip body 13a, the C-shaped deforming portion 51 is deformed as shown by a two-dot chain line in FIG. 6 when it goes over the thick portion 50 of the tip 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 deformed portion 51 as shown in FIG. This is to prevent the living body from being damaged by the corners on the outer surface of the deformed portion 51. The position of the notch 99 (see FIG. 6) of the deforming portion 51 is provided below the surface including the objective lens 31 and the illumination lens 30. Accordingly, when the deformable portion 51 is deformed, the distal end cover is present below the deformable portion 51, so that the deformable portion 51 is easily deformed, and the work of attaching the distal end cover portion 27 to the distal end body 13a becomes easy.

As shown in FIGS. 4 and 5, a tapered portion 101 is provided at the boundary between the cover member 48 and the front end cover 28.
Is provided. The tapered portion 101 serves as a guide when engaging the distal end cover portion 27 with the distal end portion main body 13a. In addition, the tapered portion 101 is, of course, an oblique surface, and the length of the boundary between the cover member 48 and the front end cover 28, which can be a high-frequency current leakage path, is longer than that of a vertical surface. As a result, high-frequency current can be prevented from leaking through the tapered portion 101, which is safe.

As shown in FIG. 3, on the distal end side, the tapered portion 102 of the distal end cover 28 and the cover member 4
The gap between the engaging portion of the cover member 48 and the front end cover 28 at the time of mounting is reduced by overlapping the tapered portion 103 of FIG. The fixing strength of the cover member 48 in a direction perpendicular to the plane of FIG. 1 is increased by engaging the protrusion 104 at the front end of the front end component member 29 with the cover member 48. In addition, a round chamfer 105 is formed at a corner of the protruding portion 104, so that dirt is less likely to accumulate and labor for cleaning can be omitted.

When the tip cover 27 shown in FIG. 7A is assembled to the tip body 13a shown in FIG. 7B, the state shown in FIG. 1 is obtained. Further, as shown in FIG. 7B, the tip component 29 has a flat surface corresponding to the stand 18, so that the cleaning property is very good.

Next, a description will be given of a mechanism on the operation unit side for raising the standing table 18. As shown in FIG.
The forceps upright pipe 96 of the present embodiment passes through the inside of the insertion portion 6 and reaches the vicinity of the operation wire outlet portion 200. Further, the operation wire 58 is pulled out from the upright wire outlet portion 200, and a base end portion of the pulled out operation wire 58 and a upright operation rod 250 described later are connected through the connection portion 201 (FIG. 2). reference). A protection cover 202 made of an insulating plastic resin such as polypropylene or polyethylene is detachably attached to the standing wire outlet 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 configuration in the vicinity of the upright wire outlet will be described with reference to FIG. In the figure, reference numeral 203 denotes a base of a flexible tube constituting the insertion section 6, and a tapered section 204 provided on the base end side of the base 203 is related to a tapered section 205a of a cylindrical body 205 which is a structure of an operation section. 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 207 is formed in the base 203, and the sealing member 208 is provided in the groove 207 to form the tapered portion 20.
The watertightness of 4,205a is ensured.

Reference numeral 209 denotes a mounting member.
09 is provided with a rubber lining to form a break prevention 210. Further, a cover 211 made of a plastic resin is adhesively fixed to the mounting member 209. That is, the attachment member 209, the fold-prevention 210, and the cover 211 constitute a set.

Next, the assembling method will be described.

First, after the insertion portion 6 is in the assembled state, the second
Is cut to a predetermined length. At this time, the operation wire 58 has not been inserted into the second forceps upright pipe 96. Then, the second forceps rising pipe 9
6. A tube 21 made of tetrafluoroethylene resin is provided around
2 and the tube 2
12 is tied and fixed with a thread. Thereafter, the other end of the tube 212 is cut to a predetermined length. Next, the coil 213 having a predetermined length is fitted on the outer periphery of the distal end of the tube 212, and the distal end of the coil 213 is fixed with the adhesive layer 214. In this state, the proximal ends of the tube 212 and the coil 213 are not fixed but are free ends.

Next, a step of docking the insertion section 6 with the operation section 3 is performed. First, with the built-in components aligned and set at a predetermined position, the cylindrical body 20 serving as the structure of the operation unit is set.
The tapered surface 204 of the base 203 and the tapered surface 205a of the cylindrical body 205 are engaged with each other so that the insertion portion 6 is inserted from the front end portion 13 side into the inside 5, and the two are fastened and fixed by the screw member 206. At this time, the tube 212 and the coil 213
Is located inside the cylindrical body 205.

Next, the grip 215 forming the grip portion 4
And the grip 215 and the cylindrical body 205 are fastened and fixed by the screw member 216. Next, a first fixed cover 2 having a shape as shown in FIG.
In a state where the seal member 219 is fitted into the groove portion 218 of the first fixing cover 217, the first fixed cover 217 is fitted from the front end portion 13 side. And abuts against the end of the screw member 216 located here. In this state, the key 2 is inserted into a groove formed between the first fixed cover 217 and the cylindrical body 205.
20 and the first fixed cover 217 is attached to the cylindrical body 2.
05 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 part is attached to the first fixing cover 217.
Into the opening 221. Further, a groove 225 is provided on the outer periphery of the forceps raising pipe opening 223, and a gap between the forceps raising pipe opening 223 and the first fixed cover 217 is provided by a seal member 226 disposed in the groove 225. Water tightness is ensured. The forceps raising pipe opening 223 is provided with an extending portion 227 extending in the direction of the cylindrical body 205 to prevent the key 220 from coming off in the axial direction.

Next, the base end side (free end) of the tube 212 and the coil 213 is pulled out of the cylindrical body 205 through the elongated hole opening 228 of the cylindrical body 205, and the tube 212 is water-tightly bonded to the distal end of the pipe 222. Together with the bobbin. Thereafter, the base end of the coil 213 is adhered to the distal end of the pipe 222, and an adhesive is applied from above the yarn to form an adhesive layer 229, and the base end of the coil 213 is fixed.

Next, the second fixed cover 230 with the seal member 232 provided in the groove 231 is fitted from the front end portion 13 side and abuts against the first fixed cover 217. As shown in FIG. 14, the second fixed cover 230
Is fixed to the fixed cover 217 so as not to rotate. After that, the above-described assembly including the attachment member 209, the fold-prevention 210, and the cover 211 is fitted from the front end portion 13 side, and the attachment member 2
09 and the cylindrical body 205 are screwed together with a screw portion 233, whereby the entire assembly is pressed in the axial direction and fixed. At this time, watertightness between the second fixing member 230 and the cylindrical body 205 is ensured by the seal member 234.

In FIG. 2, when the upright operating lever 19 provided on the operating section 3 is moved, the upright operating rod 250 moves forward and backward, and the amount of displacement of the upright operating rod 250 is finally changed via the connecting portion 201 to the distal end portion 13. It is transmitted to the stand 18. Less than,
Such a driving mechanism will be described with reference to FIGS.

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

As shown in FIGS. 15 and 16,
A first link 259 forming a connecting portion 258 is fixed to the rotating body 253. As shown in FIG. 16, the first link 259 is formed of a metal plate, and has a mounting portion 259b having a plurality of mounting holes.
9b extending from the connecting portion 259a. Mounting part 2
59b is fixed to the rotating body 253 by a plurality of mounting screws 262. The connecting portion 259a is connected to the pivot pin 26.
3 is rotatably fixed to the second link 264.

Further, as shown in FIG.
Is provided with an O-ring 267 in the mounting hole 266 of the casing 265.
And is rotatably supported from the outside by a fastening ring 268 fixed via the support. Further, the rotating body 253 is fixed to the fixing member 269 by the screw member 270.

On the other hand, at the other end of the second link 264,
A link connecting member 272 is accommodated inside a partition member 271 (see FIG. 17) having a U-shaped cross section so as to be movable in the axial direction. As shown in FIG. 17, the link connecting member 272 is connected to the second link 264 via a pivot pin 273 so as to be automatically rotated. The pivot pin 273 is
Are inserted through both the link 264 and the link connecting member 272, and the C ring 274 prevents the disengagement.

As shown in FIG. 15, the link connecting member 27
2 has an L-shaped connecting member 275 at the tip end thereof.
It is screwed and fixed by screws 286 via 76. Further, a guide body 277 made of a plastic resin such as polyacetal having good slipperiness is provided below the link connecting member 272. In this case, since the sliding property of the guide body 277 is good, the operation of the link connecting member 272 becomes smooth, and the operation feeling is improved. Further, the guide body 277 is fixed to the base plate 278 of the operation unit 3 by a screw member 279, and the screw part 28 of a locking plate 280 for locking a cover member 281 described later.
By screwing the fixing screw 283 into the partition member 2
71 and the base plate 278 sandwiched between the cover member 2
It is fixed to 81.

As shown in FIG. 18, the L of the connecting member 275
A convex portion 284 formed by press working at an angle different from the bending direction is provided in the bent portion to improve bending rigidity. Since the connecting member 275 protrudes from the outer surface of the grip 215, during assembly, the grip 215 is tightened and fixed with the screw member 216 as described in FIG.
The connecting member 275 is inserted from 85 and fixed with the screw 286.

As shown in FIG. 19, the grip opening 285 has a substantially rectangular shape. Further, a cover member 281 is attached so as to fit in the grip opening 285. As shown in FIGS. 15 and 20, a seal member 287 is provided at a portion corresponding to the grip opening 285 of the cover member 281. The cover member 281 prevents the protrusion 288 on the base end side shown in FIG. 15 from being pulled in the grip 215 from the grip opening 285 to prevent the cover member 281 from falling off in the vertical direction. further,
The distal end of the cover member 281 is fixed to the above-described locking plate 280 by 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.
0, and two cover members 281 are provided.
The gap between the screws 289 is filled with a silicon-based adhesive 291. Since the cover member 281 and the like made of plastic resin are tightened by the screw 289, the screw 289 is tightened with a certain amount of force in consideration of the tightening torque.

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

After attaching the cover member 281 as described above, the upright operating rod 250 is inserted through the opening 297 of the pressing member 296, and the connecting member is connected to the screw portion 298 provided at the base end of the upright operating rod 250. 275 is screwed. In this state, when the upright operating lever 19 is rotated, the link connecting member 272 moves back and forth, and the upright operating rod 250 moves forward and backward. As shown in FIG. 15, a stopper 299 is fixed by a screw 300 in order to regulate the amount of movement of the link connecting member 272.

Next, the connection section 201 will be described with reference to FIG. As shown in FIG. 21A, a flange portion 301 is provided on the distal end side of the standing operation rod 250. In addition, a small diameter portion 3 is provided at the base end of the flange portion 301.
02 is provided, and a large diameter portion 303 is provided at the base end of the small diameter portion 302. A connection member 304 is detachably provided at the tip of the upright operation rod 250.

As shown in FIG. 21B, a horseshoe-shaped notch is formed at the base end of the connecting member 304 that fits into the small-diameter portion 302 and the flange portion 301 of the upright operating rod 250. The notches 305a and 305b are provided, so that the connecting member 304 can be attached and detached from the side of the standing operation rod 250. Further, a cap 306 for maintaining the connection state between the upright operation rod 250 and the connection member 304 is provided on the outer periphery of the connection portion between the upright operation rod 250 and the connection member 304. The cap 306 is formed of a plastic material having high elasticity such as polyacetal, polyethylene, or polypropylene.
7 are provided. The protrusion 307 is connected to the connecting member 304.
By engaging with the concave portion 308 provided on the outer periphery of the cap 306, the cap 306 can be positioned and at the same time, a click feeling can be obtained.

With the cap 306 moved to the position shown by the two-dot chain line in FIG.
50 is engaged with the connecting member 304, and then the cap 3
06 is moved to the position indicated by the solid line.
50 large diameter portion 303 and inner circumferential engagement portion 30 of cap 306
9 are engaged, and the standing operation rod 250 is fixed. .
As described above, since the cap 306 is formed of a plastic resin, when the cap 306 is fitted on the outer periphery of the connection member 304, the cap 306 is arranged in the state shown in FIG. You. In this case, a tapered surface 311 is provided on the outer periphery of the base end of the connecting member 304 to improve the assembling property. this is,
When the cap 306 is forcibly fitted on the outer periphery of the connection member 304, the cap 306 is easily spread. In order to increase the elastic area of the cap 306, a notch 310 as shown in FIG.

On the other hand, a fixing screw 312 is provided on the distal end side of the connecting member 304 so that the operation wire 58 can be fixed at an arbitrary position. The operation wire 58 shown by a two-dot chain line indicates that the insertion portion 6 can be adjusted even if the length of the insertion portion varies for each solid. For this purpose, a space 313 is provided. ing.

By the way, the cover member 48 is
In a state in which the insulation block 57, the pin 55, and the operation wire 58 are assembled, as shown in FIG. 23, it is inserted between the kraft sterilizing paper 314 and the lacinate film 315,
For example, it is sterilized with ethylene oxide gas. In this case, kraft sterilized paper 314 and lacinate film 315
Is a seal part 316 whose periphery is sealed by heat.
And form a sterile pack as a whole. And, in this case, the kraft sterilized paper acts as a filter that allows gas to pass but does not allow bacteria to pass.

The above-mentioned assembly has a unit configuration that can be used in common between different models as long as the size of the forceps channel 76 is the same.

As described above, the endoscope 1 of this embodiment is
Since the stopper 59 for restricting the erecting operation of the erecting base 18 is provided on the insulating block 57 of the detachable tip cover 27, when the tip cover 27 is detached from the tip body 13a, the tip body 13a is simple. It becomes a shape, and the cleanability becomes good. Further, by disposing the detachable tip cover portion 27 after use, the labor for cleaning is greatly reduced.

The distal end cover portion 27 in which the cover member 48, the upright base 18, the insulating block 57, the pin 55, and the operation wire 58 are formed as a set, if the size of the forceps channel 76 is common, can be used between different models. However, since it can be used, there is no mistake in assembly.

By changing the color of the surface, the detachable distal end cover 27 and the distal end main body 1 integrated with the insertion portion are provided.
3a can be identified at a glance, so that the cleaning person can immediately recognize that the tip cover portion 27 is detachable, and the cleaning method can be performed separately from the conventional endoscope. it can. In other words, the cleaner removes the heavily soiled distal end cover portion 27 from the distal end body 13a to obtain a state of good cleanability, and in this state, the distal end body 13a
Alternatively, the tip cover 27 can be washed. Therefore, it is possible to avoid a loss of cleaning time in which cleaning is performed by a conventional method.

Further, since the stopper 59 is provided on the removable front cover 27 side, the accuracy of the stopper 59 is determined only by the variation of the components in the assembled state. That is, variation in the relative position between the distal end cover portion 27 and the distal end component member 29 at the time of mounting does not affect the accuracy. Therefore,
The accuracy is improved.

FIGS. 24 and 25 show a second embodiment of the present invention. In the present embodiment, a stopper 59 is provided on the upright 18 and is basically similar to the first embodiment. Therefore, only the portions different from the first embodiment will be described below.

As shown in FIG. 25, the stopper 59 is provided on the stand 18. Then, the stopper 59 abuts on the flat surface 341 of the insulating block 57 provided integrally with the cover member 48 by adhesion during the erecting operation of the erecting table 18 to regulate the operation of the erecting table 18.

When the detachable cover member 48 is attached to the distal end portion main body 13a and the base end of the operation wire 58 is connected to the connecting portion 201, if the erecting wire 58 is pulled too much to loosen the erecting wire 58, the erecting wire may be lifted. There is a possibility that the table 18 is installed in a state where it is not sufficiently inverted as shown in FIG. Therefore, in this embodiment, a temporary locking member 342 for locking the upright stand 18 at a predetermined position is provided.

The temporary locking member 342 has a flange portion 343 formed to have a diameter larger than the diameter of the distal end portion 13.
This is to prevent the temporary locking member 342 from being used by mistake while attached, and to enhance the visibility so as to immediately notice the abnormality. Therefore, the identification may be performed by changing the color and coloring, for example, red.

Further, a regulating pin 344 for regulating the position of the standing stand 18 is provided upright on the temporary locking member 342. A projection 345 is formed in the middle of the regulation pin 344 at a position beyond the hole 346 of the cover member 48.
Since the temporary locking member 342 is made of a plastic resin, the convex portion 345 is not provided on the entire circumference, but is provided in a part as shown in FIG.

A plurality of cutouts 347 are provided in the hole 346 of the cover member 48 so that the protrusion 345 of the regulating pin 344 is easily deformed when passing through the hole 346 (see FIG. 25C).

Further, the stand 18 is provided with a fitting hole 348 for fitting with the regulating pin 344, and the fitting hole 348 and the regulating pin 344 are fitted to fix the standing stand 18 at the inverted position. Is done.

In the above configuration, as shown in FIG. 24, with the temporary locking member 342 attached, the cover member 48 is attached to the distal end body 13a, and the erecting stand operation is performed so that the erecting stand 18 is in an inverted state. In a state where the lever 19 is operated, the upright wire 58 is connected by the connecting portion 201, and then the temporary locking member 342 is pulled out. Since the mounting of the front end cover portion 27 to the main body 13a can be performed without concern for the posture of the upright stand 18, the preparation does not take much time.

FIGS. 26 and 27 show a third embodiment of the present invention. In the present embodiment, a square pillar-shaped stopper 59 is provided on the cover member 48, and the other configuration is the same as that of the first embodiment.

In this configuration, since the stopper 59 is provided on the cover member 48, the stopper 5 is moved from the shaft 65 of the stand 18.
The distance to 9 increases. Therefore, even if the position of the stopper 59 varies within the part tolerance, the distance from the shaft 65, that is, the radius of the circular arc, is large, so that the angle variation when the upright stand 18 comes into contact with the stopper 59 becomes small, and the stopper 59 is locked. Position accuracy is improved.

[0088]

As described above, in the endoscope of the present invention, since the stopper for restricting the erecting operation of the treatment instrument erecting stand is provided on the detachable distal end cover, the distal end of the endoscope can be moved from the distal end of the endoscope. When the section is removed, the distal end portion of the endoscope has no complicated uneven shape for the stopper. Therefore, when cleaning, the detachable tip cover can be removed for cleaning, and
Since the end portion of the endoscope has less irregularities, it does not require much time for cleaning.

[Brief description of the drawings]

FIG. 1 is a plan view of a distal end portion of an endoscope according to a first embodiment of the present invention.

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

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a sectional view taken along line CC of FIG. 1;

FIG. 6 is a sectional view taken along line DD of FIG. 1;

FIG. 7 is a plan view showing a state in which a distal end cover is removed from a distal end body.

FIG. 8 is a sectional view taken along line EE in FIG. 1;

FIG. 9 is a perspective view of a distal end cover of the distal end body.

FIG. 10 is a cross-sectional view illustrating an example of a connection between an upright and an insulating block.

FIG. 11 is a cross-sectional view showing a connection state at a distal end portion of a forceps standing pipe.

FIG. 12 is a cross-sectional view showing an internal structure around an operation wire outlet section 200.

FIG. 13 is a sectional view taken along line GG of FIG.

14 is a sectional view taken along line FF of FIG.

FIG. 15 is a sectional view of a main part of the operation wire driving mechanism.

FIG. 16 is a plan view of FIG. 15 as viewed from the direction I.

FIG. 17 is a sectional view taken along the line JJ of FIG. 16;

18A is a perspective view of an L-shaped portion of the connecting member shown in FIG. 15, and FIG. 18B is a cross-sectional view taken along line KK of FIG.

FIG. 19 is a plan view near a grip opening.

FIG. 20 is a sectional view taken along the line HH in FIG. 15;

21A is a cross-sectional view of a main part of a connecting portion for connecting an operation wire and a standing operation rod, and FIG. 21B is a cross-sectional view taken along line LL of FIG.

FIG. 22 is a plan view showing a modification of the cap.

FIG. 23A is a plan view of a sterilization pack for sterilizing a distal end cover portion, and FIG. 23B is a side view of the sterilization pack of FIG.

FIG. 24 is a plan view showing a state in which a distal end cover of a distal end portion of an endoscope according to a second embodiment of the present invention has been removed from a distal end portion main body.

25A is a sectional view taken along line MM of FIG. 24,
(B) is a sectional view of the regulating pin of (a), and (c) is a sectional view of a hole of the cover member into which the regulating pin is inserted.

FIG. 26 is a plan view showing a state in which a distal end cover of a distal end portion of an endoscope according to a third embodiment of the present invention has been removed from a distal end body.

FIG. 27 is a sectional view taken along line NN of FIG. 26;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Endoscope, 6 ... Insertion part, 13 ... Tip part, 18 ... Treatment tool stand, 27 ... Tip cover part, 59 ... Stopper.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-57-75629 (JP, A) JP-A-59-34239 (JP, A) JP-A-4-218134 (JP, A) JP-A-4- 314439 (JP, A) Japanese Utility Model Hei 5-28303 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A61B 1/00-1/32 G02B 23/24

Claims (1)

(57) [Claims] An insertion portion has a detachable distal end cover portion at a distal end side portion thereof, and is rotatable with a treatment tool stand .
The operation tool for rotating and erecting the treatment instrument erecting base by
And an endoscope having the ear disposed on the distal end side of the insertion section.
And a stopper for restricting rotation of the treatment instrument upright at a predetermined position when the treatment instrument upright is raised by pulling the operation wire, is provided at the distal end cover portion. Endoscope.