JPH07184838A - Tip cover for endoscope - Google Patents

Abstract

PURPOSE:To enable the mounting or removing of a loading/unloading cover at the tip part of an endoscope simply and accurately by providing a hook part for catching a withdrawing jig at a part of a retaining piece of the loading/ unloading cover at the tip part of the endoscope. CONSTITUTION:An endoscope is provided with a tip opening 136 of a forceps channel 135 at a tip part 4 provided at the tip of an insertion part and the tip part 4 is provided with a for-ceps erecting base 137 to erect forceps inserted through the channel 135. The forceps erecting base 137 makes up the forceps base erecting base 137 together with a loading/unloading cover 168, a slope part body 165 and the like. In this case, an engaging hole (catching part) 94 for inserting a withdrawing jig 105 is provided on the root side of a retaining piece 93 provided on the loading/unloading cover 168. The catching part 110 of the withdrawing jig 105 is put into the engaging hole 94 provided on the retaining piece 93 and the retaining piece 93 is broken to be removed from a recessed groove 172 provided on a bottom part 170 of a fixed cover 169 thereby enabling the removing of the loading/unloading cover 168 from the body 134 of the tip part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope having a removable cover at the tip of an endoscope insertion portion.

[0002]

2. Description of the Related Art As is well known, medical endoscopes such as gastroscopes and duodenal scopes are used for observing and treating an affected part by inserting the insertion part into the body cavity of the patient. A forceps raising device is a mechanism that directs forceps to a desired affected area when collecting biopsy tissue and treating the affected area while observing the affected area. Basically, the forceps raising device is composed of a forceps raising base rotatably provided at the distal end of the insertion portion and an operation wire connected to the forceps raising base. The direction of the forceps is determined by adjusting the angle of.

When the endoscope is used, the fluid in the body cavity invades the forceps raising base storage chamber in which the forceps raising base is accommodated and the guide tube of the operation wire. Therefore, it is necessary to wash after use. In particular, since the guide tube for the operation wire is thin and the operation wire passes through the inside, cleaning is very time-consuming.

As a countermeasure against this, JP-A-59-15601 discloses a guide tube provided with an intrusion prevention member (packing) at the opening. Also,
Japanese Patent Application Laid-Open No. 57-7 discloses that the forceps raising base storage chamber can be easily cleaned by making the tip cover detachable.
It is disclosed in Japanese Patent No. 5629 and Japanese Patent Application Laid-Open No. 4-314439. As another example, the forceps raising base, the operation wire, and the inner layer tubular member (the guide tube is composed of the outer layer tubular member (tube body) and the inner layer tubular member (contact wound coil body)) can be detached to facilitate cleaning. This is disclosed in JP-A-56-8030.

[0005]

Among the above-mentioned conventional techniques, the method of making the tip cover detachable is effective in facilitating cleaning, but has the following problems in the work of removing the tip cover. ing. First, in the method of removing the tip cover by hand, the hand is easily contaminated, and it is difficult to remove the tip cover, and there is a possibility of damaging the hand when the tip cover is destroyed. In addition, the method of pinching and breaking the tip cover with pliers or the like requires a large amount of force and also has a problem of breaking internal parts. Further, the method of fixing the tip cover with screws or the like and removing the screws by removing them is very small and easy to eliminate, and there is a risk that the screws will fall out in the body.

Therefore, as shown in FIG. 4, the fixed cover 1
A configuration is conceivable in which the locking piece 93 of the detachable cover 168 is fitted into the concave groove 172 formed in the bottom portion 170 of the 69 by elastic deformation. When removing the detachable cover 168, the detachable cover 1 is broken by destroying only the locking piece 93.
It becomes easy to remove 68. However, as shown in FIG. 4, if the end of the locking piece 93 is projected beyond the outer diameter of the distal end so that the locking piece 93 can be easily broken, the body wall may be damaged when the endoscope is inserted. I have a problem.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a distal end cover for an endoscope in which the attachment / detachment cover of the distal end portion of the endoscope can be easily and surely removed. To do.

[0008]

Therefore, in the endoscope tip cover of the present invention, a hooking portion for hooking the extraction jig is provided in a part of the locking piece of the detachable cover of the endoscope tip portion. It is characterized by that.

[0009]

In the present invention, the removal piece is destroyed by hooking the removal jig on the catching portion provided on a part of the locking piece of the removable cover to remove the removable cover.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an example of an endoscope to which the present invention is applied,
It is a schematic diagram showing the whole composition. The endoscope includes an operation section 1 and a grip section 2 for holding the operation section 1 by hand, and the operation section 1 includes an insertion section 3 and a universal cord 12.
Are connected. The universal cord 12 has a connector 7 at its end, and this connector 7 is connected to a light source device 8 that supplies illumination light. The insertion portion 3 has a bending portion 5 that is bent by an angle knob 6 provided in the operation portion 1 and a tip portion 4 provided at the tip thereof, and the tip portion 4 has forceps extending inside the insertion portion 3. Tip opening 13 of channel 135
6 (FIG. 7) are provided. The other opening of the forceps channel 135 is provided as a forceps opening portion 21 in the operation portion 1, and a forceps plug 22 is attached to the forceps opening portion 21 as needed. The insertion portion 3 is provided with an odor cover 36 for preventing breakage at the end portion on the operation portion 1 side.

An air supply device 13 and a water supply device 14 are connected to the connector 7, and a video processor 10 for processing a video signal is connected via a connection adapter 9. The video processor 10 includes a monitor 11 for displaying a subject image based on the signal-processed video signal, a VTR deck 17 for recording / reproducing the video signal, a video printer 16 for printing the subject image according to the video signal, and a video signal for recording. A large capacity storage device such as a video disk 15 is connected.

The operation unit 1 is provided with a switch 20 for operating the video processor 10, and the operation unit 1 is provided with an air supply / water supply piston 18 for supplying air to the distal end 4 of the insertion unit 3 and water. A suction piston 19 for sucking is provided. In the operation portion 1, a forceps raising wire opening portion 23 is provided below the grip portion 2, and a drive shaft opening portion 24 is provided in the grip portion 2. One end of the forceps raising wire 26 is led out from the forceps raising wire opening 23,
From the drive shaft opening 24, one end of a drive shaft 27 that is moved by a forceps raising lever 29 provided coaxially with the angle knob 6 is led out. The drive shaft 27 and the forceps raising wire 26 are
Removably connected to the connector 28, the connector 2
A protective cover 25 made of an electrically insulating material for covering 8 is detachably provided.

Next, the details of the forceps raising wire opening 23 of FIG. 1 will be described with reference to FIGS. 2 and 3. Figure 2
2 is an axial sectional view showing details of the forceps raising wire opening 23 of FIG. 1, and FIG. 3 is a sectional view taken along the line AA of FIG.

In FIG. 2, the forceps raising wire opening 2 is shown.
3, a cylindrical body 30 provided in the operation portion 1 of FIG. 1 extends, and at a position below the grip portion 2, the forceps opening main body 31 is provided on the cylindrical body 30 and a stopper ring 32 is provided on the cylindrical body 30. It is fixed by being screwed into the screw portion 33.
The insertion portion end portion 34 of the tubular body 30 has a tapered portion 35 on the inner surface,
It has a threaded portion 39 on the outer surface. The threaded portion 39 is screwed into the threaded portion 38 provided on the inner surface of the oledome base 37 which is insert-molded into the dome 36 made of an elastic member. The insertion portion 3 has a tapered portion 40 on the outer circumference of the end portion on the operation portion side. The taper portion 40 is provided with a concave groove 41, and the insertion portion side thereof has a connection mouthpiece 43 having a screw portion 42. The connection mouthpiece 43 and the tubular body 30 have an O-ring 4 in which the tapered portion 35 and the tapered portion 40 are provided in the concave groove 41.
4 is sealed and connected by a stopper ring 46 having a threaded portion 45 on the inner surface and screwed and fixed via the threaded portion 42 of the connection mouthpiece 43.

Further, on the tip side of the forceps opening main body 31,
A forceps raising wire opening 23 is provided. The forceps raising wire opening 23 is composed of a fixed cover 47 and a forceps raising wire opening body 48. In order to seal-bond the fixed cover 47 and the ends of the forceps opening main body 31, a flange portion 51 forming a concave groove 50 for accommodating the O-ring 49 is provided in the forceps opening main body 31. As shown in FIG. 3, the fixed cover 47 has the insertion hole 5 of the tubular body 30.
2 and an opening 54 to which the forceps raising guide tube base 53 is fixed
And have. The insertion hole 52 and the opening 54 are formed such that their longitudinal central axes are parallel to each other. The fixed cover 47 and the tubular body 30 are positioned by the key grooves 55 and 56 formed on the inner circumference of the insertion hole 52 and the outer circumference of the tubular body 30, and the key 57 inserted into the key grooves 55 and 56.

As shown in FIG. 2, the forceps raising guide pipe mouthpiece 53 is sealed in the opening 54 of the fixed cover 47 through an O-ring 70 provided in a concave groove 58 formed on the outer periphery thereof. . The forceps raising guide tube mouthpiece 53 has an insertion hole 60 for accommodating a mouthpiece pipe 59 through which the forceps raising wire 26 passes.
have. The mouthpiece pipe 59 is connected to a tip portion main body 134 (FIG. 6) described later. Mouthpiece pipe 59
The fixed end of the has a trumpet portion 62, and the forceps raising guide tube base 5
The 3rd side also has a taper portion 63 that matches it, and the joint portion is adhered, and the infiltration of the fluid in the body cavity is prevented by the adhesive. The fixed cover 47 and the forceps raising guide tube mouthpiece 53 are provided with a recess 64 on the inner surface of the fixed cover 47 so that they are even when they are fixed.
A protrusion 65 is provided on the forceps raising guide tube base 53.
The forceps raising guide tube ferrule 53 has a notch 67 at the other end, to which the forceps raising wire opening body 48 is joined, as well as a tongue portion 66 for pressing the key 57. Similarly, at the end of the fixed cover 47 on the insertion portion 3 side, a protruding end 69 having a concave groove 68 provided at the end of the forceps raising wire opening main body 48 on the operating portion 1 side and an O provided in the concave groove 68 are provided. Ring 71
To form a concave end 72 which is sealingly connected via.

An end of the forceps raising wire opening main body 48 on the side of the insertion portion 3 has an open concave end 73.
The forceps raising wire opening body 48 has a watertight structure via an O-ring 74 and a space portion 76 in which a cap pipe 59 made of a hard material, such as a stainless steel, is movable, as will be described later. Has been formed. The forceps raising wire opening main body 48 is positioned and fixed to the concave end 72 of the fixed cover 47, and has a threaded portion 79 that is screwed into a threaded portion 77 provided at the protruding end of the oledome base 37 from the dome 36. It is pressed and fixed by a connecting pipe 78 provided in the. The end of the connecting tube 78 on the side of the operation portion 1 has a protruding end 80 that fits inside the end of the forceps raising wire opening body 48 on the side of the insertion portion 3. In the space portion 76, the insertion portion 3
The mouthpiece pipe 59 of the forceps raising wire 26 arranged at the tip 4 extends in an S shape. The cylindrical body 30 has a cutout window 84 that connects the space portion 76 inside the forceps raising wire opening body 48 and the space inside the cylindrical body 30 to the space 7.
It is provided at almost the same position as 6.

Next, the details of the tip portion 4 according to the present invention will be described with reference to FIGS. FIG. 5 is a schematic side view showing a state in which the tip cover 168 of the tip portion 4 of FIG. 1 is removed. 6 shows the structure of the tip portion 4 of FIG. 5 when the assembly is completed, and FIG. 6 (A) is a plan view showing a partially broken surface.
6B is a cross-sectional view taken along the line Q-Q in FIG. 6A in the arrow direction, and FIG. 6C is a cross-sectional view taken along the line D-D in FIG. 6B in the arrow direction. It is a figure. FIG. 7 shows PP of FIG.
It is sectional drawing seen in the arrow direction along a line. FIG. 8 is a sectional view taken along the line HH of FIG. 7 and viewed in the direction of the arrow. FIG. 9 is a diagram partially different from the structure of FIG.
It is sectional drawing seen in the arrow direction along the F line. FIG. 10 is a sectional view taken along the line EE of FIG. 6B and seen in the direction of the arrow. FIG. 11 shows the slope portion main body, FIG. 11 (A) is a plan view, and FIG. 11 (B) is a side view. 12A is a partial side view seen from the G direction in FIG. 6B, and FIG. 12B is a front view seen from the N direction in FIG. 12A.

In FIG. 5, the tip portion 4 is an objective lens 1
31, an illumination lens 132, and a tip end portion main body 134 provided with a nozzle 133 for ejecting air, water, or the like. The distal end portion 4 has a distal end opening portion 136 of a channel 135 (see FIG. 7) communicating with the forceps opening portion 21 of the operation portion 1.
(See FIG. 7) is provided, and the forceps raising base 13 for raising the forceps (not shown) inserted into the channel 135 at the tip thereof.
7 is provided.

As shown in FIG. 9, the forceps raising base 137 has a tip accommodating portion 140, and a tip 139 provided by swaging at the tip of the forceps raising wire 26 is inserted in the tip accommodating portion 140. . The forceps raising base 137 is formed by a raising shaft 138 made of plastic or the like and the slope portion main body 165.
Is rotatably provided within a predetermined angle range.

A detachable cover 16 made of an insulating material such as polysulfone and modified PPO is attached to the tip end main body 134 (FIG. 5).
8 and the fixed cover 169, and the fixed cover 169 is adhesively fixed to the side hole 142 of the tip body 134 with a pin 141 shown in FIG.
Is integrated with the forceps raising base 137, the forceps raising wire 26, and the slope portion main body 165 to form a forceps raising base unit 85.
(Fig. 5), and is provided so as to be detachable from the tip portion 4. In order to attach the forceps raising base unit 85 to the tip portion 4, first, after inserting the tip of the forceps raising wire 26 into the guide tube 162 (FIG. 6C) provided in the tip portion main body 134, the forceps raising wire 26 is inserted. The detachable cover 168 is attached using the guide tube 162 as a guide. Forceps raising unit 8
Removing 5 from the tip 4 makes it easier to clean the surface of the tip 4.

FIG. 11 shows details of the slope portion main body 165, which has a raising shaft hole 229 through which the raising shaft 138 passes, and the forceps raising wire 26 from the left side toward the upper side in the figure. It has a smooth slope 230 along the traveling of the above, and is configured to be connected to the upper surface 233 which is substantially parallel to the raising wire guide hole 231 penetrating to the upper portion.
On the side wall of the upper surface 232 on the side of the forceps raising base 137, there is provided a stopper protrusion 166 for restricting the raising range of the forceps raising base 137. Further, the slope portion main body 165 has a tip opening surface 233 on the right side in the drawing, which opens the channel 135 (FIG. 7), and constitutes a forceps passage portion 234 smoothly connected to the forceps raising base 137 from the surface. With
The upper surface of the forceps path portion 234 constitutes a raising guide portion 235 that follows the shape in which the forceps bend when the forceps are raised.
At this time, the raising wire guide hole 231 and the forceps path portion 23
The center lines of 4 are substantially parallel to each other, and the raising shaft holes 229 are substantially perpendicular to each other. Further, the contact surface 236 of the slope 230 on the forceps raising base 137 side is provided substantially parallel to the side wall of the forceps raising base 137, and further, a cutout portion 237 in which the bottom portion of the forceps raising base 137 is located is formed in the bottom portion.

As shown in FIGS. 5 and 6, the tip portion main body 13
4 is an objective lens 131, an illumination lens 132, and a nozzle 1.
The portion having 33 is formed so that at least the surface on the forceps raising base 137 side is a flat surface, and the channel mouthpiece 157 and the open end of the guide tube 162 are also flat surfaces. It is provided in a shape.
In accordance with this, the fixed cover 169 is also provided in an L shape as shown in FIG. 12, and a concave groove 172 having a partial cutout portion 171 is provided above the spool winding adhesive portion 145. The upper part thereof is formed so as to cover the tip end main body 134 except for the objective lens 131, the illumination lens 132, the nozzle 133, and the like. The spool adhesive portion 145 is a portion for fixing the curving rubber 144 made of an elastic material such as fluororubber provided on the curving portion 5 (FIG. 5) so as to be easily curbed.

On the other hand, the detachable cover 168 is formed with a C-shaped ring having a partial cutout 177 on the bottom 173 to form the engaging piece 93, and the concave groove 172 (FIGS. 4 and 6B) of the fixed cover 169.
Is elastically deformed and fitted. At this time, it is conceivable that the detachable cover 168 is made of a plastic member having higher elasticity and better slipperiness than the fixed cover 169 so that it can be easily attached and detached. Further, the same material having high elasticity may be used. Specifically, polyethylene, polyacetal, polypropylene and the like have high elasticity, and polysulfone and modified PPO have low elasticity. Further, the detachable cover 168 has a fixed cover 169 above the bottom portion 173.
A notch 174 (FIGS. 5 and 6A) that fits with the hook 175 is provided above the notch 174, and the upper end of the removable cover 168 is formed in a smooth R shape. As shown in FIG. 5, the fixed cover 169 is provided with a quadrangular protrusion 82 at the tip thereof, and the detachable cover 168 has an quadrangular shape substantially the same as the protrusion 82 at the upper end thereof. Engagement holes 83 are provided. As a result, the removable cover 16
8 and the fixed cover 169 are restricted in the rotation direction at the time of mounting.
In addition, a pin 86 that fits into the tip portion main body 134 is contained in the protrusion 82. On the rear surface of the upper end of the removable cover 168, the dug portion 8 into which a part of the tip of the tip 4 is fitted.
7 is provided.

In FIG. 6, a light guide fiber 146 for sending illumination light from the light source device 8 (FIG. 1) is arranged to face the illumination lens 132, and the light guide fiber 146 is provided in the tip end main body 134. An adhesive is filled and fixed in the cutout portion 147, and the cutout portion 147 is covered with an adhesive cover 148, and a protective tube 149 made of silicon or the like is provided from the tip end body 134 to the entire length of the curved portion 5 to the insertion portion 3. Are bonded and fixed, and a protective tube 150 made of silicon or the like is fixed by a thread 151 only on the curved portion 5 from above. Light guide fiber 146
As shown in FIG. 10, the HU screw 183 is fastened to the side wall threaded portion 182 of the tip portion main body 134.

In FIG. 6, similarly, the objective lens 131
A CCD 152, to which a lead wire (not shown) guided to the video processor 10 is connected, is arranged opposite to. The lens unit 184 of the objective lens 131 is shown in FIG.
As shown in, the HU screw 186 is fixed to the side wall threaded portion 185 of the tip portion main body 134. The nozzle 133 has its tip squeezed and is adhesively fixed to the tip end main body 134, and has an air / water feeding tube 153 connected to a cylinder (not shown) of the air / water feeding piston 18 at the other end with a thread 154. It is tied up with and fixed. A cutout portion 155 of the tip end main body 134 is provided at the connection portion of the air / water feeding tube 153, and the air / water feeding tube 153 can be bent.

FIG. 13 shows the structure at the time of completion of the assembly of the tip portion 4, and FIG. 13 (A) is a side view showing a partially broken surface.
13B is a view seen from the arrow J direction in FIG.
13C is a cross-sectional view taken along the line H-H of FIG. 13D in the direction of the arrow, and FIG. 13D is a side view viewed from the opposite side of FIG. 13A.

A plurality of ribs 88 are provided in the bottom portion 170 of the fixed cover 169 in the radial direction, and the concave groove portion 8 is also formed in the tip end main body 134 so as to fit with the ribs 88.
9 are provided to restrict movement of the tip end body 134 and the fixed cover 169 in the rotation direction. The bottom 170 of the fixed cover 169 is provided with a projection 90 that projects in the axial direction and is substantially equal to or smaller than the outer diameter of the fixed cover 169.
The protrusion 90 fits into the fitting groove 91 provided on the bottom 173 of the removable cover 168, and rotates the fixed cover 169 and the removable cover 168 together with the rectangular protrusion 82 and the engagement hole 83 at the tip portion described above. By restricting the movement in the direction, the detachable cover 168 is prevented from falling off during the endoscopic examination.

The fitting groove 9 of the removable cover 168 is also provided.
1 is provided in the rigid portion on the side opposite to the cutout portion 177 (FIG. 5). A reinforcing pin 92 penetrating the tip body 134 is inserted into the protrusion 90 of the fixed cover 169. The locking piece 93 of the detachable cover 168 is elastically deformed in the concave groove 172 provided in the bottom portion 170 of the fixed cover 169.
Fit together. Fixed cover 1 around the end of the locking piece 93
A large diameter portion 122 is partially provided around the concave groove 172 of 69, and the outer diameter of the large diameter portion 122 is larger than the outer diameter of the locking piece 93 when the engaging piece 93 is engaged with the concave groove 172. Is getting bigger. Therefore, the locking piece 93 does not pinch the mucous membrane in the body cavity during the endoscopic examination.

Next, one embodiment of the endoscope tip cover of the present invention will be described. FIG. 14 shows one embodiment of the endoscope tip cover of the present invention, and FIG.
14B is a front view seen from the right side of FIG. 14A, and FIG. 14C is a plan view of the extraction jig 105. FIG. 15 is an exploded view of the removable cover 168 and the fixed cover 169 in the tip portion 4.

In FIG. 15, the forceps base raising unit 85 is shown.
Is configured to be disassembled from the detachable cover 168, the forceps raising base 137, the forceps raising wire 26, and the slope portion main body 165. The forceps raising base 137 is used by exchanging several types of forceps raising base 137 according to the size of the treatment tool to be inserted and the raising angle desired by the user. Each forceps raising base 137 is marked with a numeral 95 or the like so that it can be distinguished from other types. Also, it is color-coded for each type.

The attachment / detachment cover 168 is a member that is discarded for each case because the locking piece 93 is destroyed and removed, but the slope main body 165, the forceps raising base 137, and the forceps raising wire 26 are cleaned and disinfected. And reuse. The discarded member is a resin molded product, and the reused product is made of metal or ceramic. The forceps raising base 137 is
It is provided on the outer peripheral side from the center of the removable cover 168,
The length of the forceps raising wire 26 is longer than the length from the tip of the tip portion 4 to the rear end of the insertion portion 3.

In FIG. 14, on the base side of the locking piece 93, an engaging hole (hook) 94 for inserting the removal jig 105 is provided. The engagement piece 93 of the removable cover 168 has a larger tightening margin in the vicinity of the cutout portion 77.
In FIG. 15, when the detachable cover 168 is attached to the distal end portion 4, before the locking piece 93 is caught in the concave groove 172 of the fixed cover 169, the protruding portion 82 at the distal end of the fixed cover 169 is provided.
The engaging hole 83 of the detachable cover 168 is engaged.

The removal jig 105 shown in FIG.
The support part 11 includes a handle part 107 and a support part 114.
A hook portion 110 is provided at the tip of the four. The hook 110 is inserted into the engaging hole 94 provided on the base side of the locking piece 93 of the removable cover 168, the locking piece 93 is bent, and the concave groove 1 provided in the bottom 170 of the fixed cover 169 is inserted.
72, and the detachable cover 168 is attached to the tip body 13
4 can be easily removed, and the tip 4 can be easily washed.

16 and 17 show another embodiment of the endoscope tip cover of the present invention, FIG. 16 shows another embodiment of the endoscope tip cover of the present invention, and FIG. 16 is a side view of the removable cover 168, FIG. 16B is a front view seen from the right side of FIG. 16A, and FIG. 17 is a side view showing the removable cover 168 and the removing jig 105.

In the present embodiment, as shown in FIG. 16, a first engaging hole 94 (a catching portion) is provided at the base side of the locking piece 93 of the removable cover 168, and the removable cover 16 is provided.
A second engagement hole 96 (a catching portion) for the extraction jig 105 is provided on the tip end side of 8. The two engaging holes 9
4, 96 are arranged on a substantially straight line and have a substantially line-symmetrical shape.

As shown in FIG. 17, the removing jig 105 in this embodiment has a support portion 11 that is substantially linear with the handle portion 107.
4 and two hook members 115, 116, and two jig members 108, which are connected by a support shaft 111.
Then, the hooking portion 115 of the removing jig 105 is engaged with the second engaging hole 96, and the hooking portion 116 is engaged with the first engaging hole 9.
4 is engaged and the grip portions 107, 107 are gripped, the hook portion 116 is lifted around the hook portion 115 as a fulcrum,
By breaking the locking piece 93, it can be easily removed from the concave groove 172 provided in the bottom portion 170 of the fixed cover 169, and the removable cover 168 can be easily removed from the tip end body 134.

18 to 20 show another embodiment of the endoscope tip cover of the present invention, and FIG.
9, a rear view showing the removable cover 168 and the removing jig 105, and FIG. 19 shows the fixed cover 169 and the removable cover 168.
20 is a side view of the fixed cover 169 and the removable cover 1 shown in FIG.
It is a rear view which shows 68 and the removal jig 113.

18 and 19, the removable cover 1
In the vicinity of the ends of the two locking pieces 93 of 68, the removal jig 105
There are two catches 120 that engage with each other. The removal jig 105 includes a substantially semicircular outer peripheral support portion 106.
The jig members 108 and 108 including the handle portion 107 are rotatably connected by a fulcrum shaft 111. A hook 110 that engages with the hook 120 is provided at the tip of the outer peripheral support 106.

In FIG. 20, the protrusion 103 provided on the concave groove 172 of the fixed cover 169 and the locking piece 93.
A gap (a catching portion) 104 with which the extraction jig 121 is engaged is provided between the end portion and the end. Removal jig 121
Is composed of two jig members 108, 108 each having a substantially semicircular outer peripheral support portion 106 and a handle portion 107. At the tip of the outer peripheral support portion 106, the end portions 109 of the two locking pieces 93 of the detachable cover 168 are caught, and the gap 10
4 is provided with a hook 110. The jig member 108 is provided with a groove portion 112 in which the fulcrum shaft 111 provided on the other jig member 108 can freely move, so that the fulcrum shaft can be changed even if the outer diameter of the locking piece 93 of the removable cover 168 changes. The 111 is moved in the groove 112 so that it can be dealt with.

The withdrawing jig 113 shown on the left side of FIG. 20 shows another example of the withdrawing jig. Two jig members 108 each consisting of a handle 107 and a substantially linear support 114 are provided on the fulcrum shaft 11.
1 are connected and configured. A hook 110 is provided at the tip of the support 114 in the same manner as described above so that the hook enters the gap 104 and is hooked by the end 109 of the locking piece 93.

In each of the embodiments shown in FIGS. 18 and 20, the extraction jig 1 is inserted into the engaging portion 120 of the engaging piece 93 or the gap 104.
When the hook portions 110 of 05, 113 and 121 are engaged and the handle portion 107 is gripped, the outer peripheral support portion 106 is opened vertically and the locking piece can be broken. The inner diameter of the locking piece 93 of the removable cover 168 and the concave groove 172 of the fixed cover 169.
The relationship with the outer diameter of is as follows.

Outer diameter of recessed groove 172 ≦ inner diameter of locking piece 93 ≦ outer diameter of recessed groove 172 + 0.2 mm
The width of 113, 121 is smaller than the width of the concave groove 172.

21 to 23 are views for explaining the packed state of the forceps raising unit 85 of FIG. Figure 21
In, the plurality of forceps raising units 85 are put in one packaging bag 97. Forceps raising unit 8 in bag 97
No. 5 is sterilized collectively, and the rising wire 26 is bent and packed in order not to make the packing form large. The bending radius of the raising wire 26 is the detachable cover 1
Greater than 68.

In FIG. 22, a thick paper 9 such as a cardboard is used.
8 is bent, a plurality of notches 100 are made in the bent portion 99, and the forceps raising unit 85 is put in the notches 100.
The raising wire 26 is inserted. The height H of the bent portion 99 is larger than the outer diameter of the removable cover 168. In FIG. 22 (B), the forceps raising base 13
It is packed so that 7 can be seen. In addition, FIG.
In (D), the tip end side of the thick paper 98 is folded back, and the folding back portion 101 protects the removable cover 168 of the forceps raising unit 85.

In FIG. 23 (A), each forceps raising unit 8 is divided into partitions 102 divided by a cardboard or the like.
It houses five. In FIG. 23B, the forceps raising unit 85 is housed in the packing bag 97 by winding the raising wire 26 along the circumference of the detachable cover 168.

[0047]

As is apparent from the above description, according to the present invention, the removal is performed by providing a catching portion for catching the removal jig on a part of the locking piece of the detachable cover at the distal end of the endoscope. The engaging piece can be easily broken by the jig, and the removable cover can be easily removed.

[Brief description of drawings]

1 is an example of an endoscope to which the present invention is applied, and is a schematic diagram showing the overall configuration thereof.

2 is an axial sectional view showing details of a forceps raising wire opening portion 23 of FIG. 1. FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2 and viewed in the direction of the arrow.

FIG. 4 is a diagram showing an example of the configuration of the tip portion for explaining the problem of the present invention, and is a diagram corresponding to the diagram seen from the right direction in FIG. 6;

5 is a schematic side view showing a state in which a tip cover 168 of the tip portion 4 of FIG. 1 is removed.

FIG. 6 shows a structure of the tip portion 4 of FIG. 5 at the time of completion of assembly, FIG. 6 (A) is a plan view showing a partially broken surface, and FIG. 6 (B) is FIG.
FIG. 6 is a sectional view taken along line Q-Q of FIG.
6C is a sectional view taken along the line DD of FIG. 6B and seen in the direction of the arrow.

FIG. 7 is a cross-sectional view taken along the line P-P of FIG. 6A and seen in the arrow direction.

8 is a sectional view taken along line HH of FIG. 7 and viewed in the direction of the arrow.

9 is a diagram partially different from the structure of FIG.
It is sectional drawing seen in the arrow direction along the FF line of (A).

FIG. 10 is a cross-sectional view as seen in the direction of the arrow along the line EE in FIG.

FIG. 11 shows the slope portion main body 165, and FIG.
Is a plan view, and FIG. 11B is a side view.

12A is a partial side view seen from the G direction in FIG. 6B, and FIG. 12B is a front view seen from the N direction in FIG. 12A.

FIG. 13 shows a configuration of the tip portion 4 when the assembly is completed, and FIG.
FIG. 13A is a side view showing a partially broken surface, and FIG.
3 (A) is a view seen from the direction of arrow J, 13 (C) is FIG.
FIG. 1 is a sectional view taken along line H-H of FIG.
FIG. 3 (D) is a side view seen from the opposite side of FIG. 13 (A).

FIG. 14 shows an embodiment of the endoscope tip cover of the present invention, FIG. 14 (A) is a side view of the detachable cover 168, FIG.
14B is a front view seen from the right side of FIG.
(C) is a plan view of the removal jig.

FIG. 15 is an exploded view of a removable cover 168 and a fixed cover 169 at the tip 4.

16 shows another embodiment of the endoscope tip cover of the present invention, FIG. 16 (A) is a side view of the detachable cover 168, FIG.
16B is a front view seen from the right direction in FIG.

17 is a side view showing the detachable cover 168 and the removing jig 105 in the embodiment of FIG.

FIG. 18 is a rear view showing another embodiment of the endoscope tip cover of the present invention, showing the fixed cover 169, the detachable cover 168, and the removing jig 105.

19 is a side view showing a fixed cover 169 and a removable cover 168 of FIG.

20 is a rear view showing another embodiment of the endoscope tip cover of the present invention, showing the fixed cover 169, the detachable cover 168, and the removal jig 105. FIG.

FIG. 21 is a view for explaining a packed state of the forceps raising unit 85 of FIG.

22 is a view for explaining a packed state of the forceps raising unit 85 of FIG.

23 is a view for explaining a packed state of the forceps raising unit 85 of FIG.

[Explanation of symbols]

4 ... Tip part, 93 ... Locking piece, 94, 96, 104, 12
0 ... Hook part 110, 115, 116 ... Hook part, 105, 11
3, 121 ... Removal jig 168 ... Removable cover, 169 ... Fixed cover, 172 ... Recessed groove

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 30, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

Therefore, as shown in FIG. 4, the fixed cover 1
A concave groove 172 provided et the the bottom 170 of the 69, is conceivable configuration in which the engaging piece 93 of the removable cover 168 fitted by elastic deformation. When removing the removable cover 168, the removable cover 168 can be easily removed by breaking only the locking piece 93. However, as shown in FIG. 4, in order to easily break the locking piece 93, the locking piece 93
If the end portion is projected beyond the outer diameter of the tip portion, there is a problem that the body wall may be damaged when the endoscope is inserted.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

Therefore, in the endoscope tip cover of the present invention, a hooking portion for hooking the extraction jig is provided in a part of the locking piece of the detachable cover of the endoscope tip portion. It is characterized by that .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

As shown in FIG. 2, the forceps raising guide pipe mouthpiece 53 is sealed in the opening 54 of the fixed cover 47 through an O-ring 70 provided in a concave groove 58 formed on the outer periphery thereof. . The forceps raising guide tube mouthpiece 53 has an insertion hole 60 for accommodating a mouthpiece pipe 59 through which the forceps raising wire 26 passes.
have. The mouthpiece pipe 59 is connected to a tip portion main body 134 (FIG. 6) described later. Fixed cover 47
A concave portion 64 is provided on the inner surface of the fixed cover 47, and a convex portion 65 is provided on the forceps raising guide tube mouthpiece 53 so that the forceps raising guide tube mouthpiece 53 becomes even when fixed. The forceps raising guide tube ferrule 53 has a notch 67 at the other end, to which the forceps raising wire opening body 48 is joined, as well as a tongue portion 66 for pressing the key 57. Similarly, the insertion portion 3 of the fixed cover 47
Also on the side end, the operation unit 1 of the forceps raising wire opening main body 48.
A protruding end 69 having a concave groove 68 provided at a side end and a concave end 72 for sealingly coupling via an O-ring 71 provided in the concave groove 68 are configured.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

A detachable cover 16 made of an insulating material such as polysulfone and modified PPO is attached to the tip end main body 134 (FIG. 5).
8 and the fixed cover 169, and the fixed cover 169 is adhesively fixed to the side hole 142 of the tip body 134 with a pin 141 shown in FIG.
Is integrated with the forceps raising base 137, the forceps raising wire 26, and the slope portion main body 165 to form a forceps raising base unit 85.
(Fig. 5), and is provided so as to be detachable from the tip portion 4. In order to attach the forceps raising base unit 85 to the tip portion 4, first, after inserting the tip of the forceps raising wire 26 into the guide tube 59 (FIG. 6C) provided in the tip portion main body 134, the forceps raising wire 26 is inserted. The detachable cover 168 is attached using the guide tube 59 as a guide. When the forceps raising base unit 85 is removed from the tip portion 4, the surface of the tip portion 4 can be easily cleaned.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

13A and 13B show the structure of the tip portion 4 when the assembly is completed. FIG. 13A is a side view and FIG . 13B is FIG.
13A is a view seen from the direction of arrow J in FIG.
FIG. 1 is a sectional view taken along line H-H of FIG.
FIG. 3 (D) is a side view seen from the opposite side of FIG. 13 (A).

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

Next, one embodiment of the endoscope tip cover of the present invention will be described. FIG. 14 shows one embodiment of the endoscope tip cover of the present invention, and FIG.
14B is a front view seen from the left in FIG. 14A, and FIG. 14C is a plan view of the extraction jig 105. FIG. 15 is an exploded view of the removable cover 168 and the fixed cover 169 in the tip portion 4.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

In FIG. 14, on the base side of the locking piece 93, an engaging hole (hook) 94 for inserting the removal jig 105 is provided. The engagement piece 93 of the removable cover 168 has a larger tightening margin in the vicinity of the cutout portion 77.
In FIG. 5 , when the detachable cover 168 is attached to the tip portion 4, before the engagement piece 93 is caught in the concave groove 172 of the fixed cover 169, the protrusion 82 at the tip of the fixed cover 169 is engaged with the detachable cover 168. The holes 83 are adapted to be engaged.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

16 and 17 show another embodiment of the endoscope tip cover of the present invention, FIG. 16 shows another embodiment of the endoscope tip cover of the present invention, and FIG. 16 is a side view of the removable cover 168, FIG. 16B is a front view seen from the left side of FIG. 16A, and FIG. 17 is a side view showing the removable cover 168 and the removing jig 105.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction content]

In FIG. 22, a thick paper 9 such as a cardboard is used.
8 is bent, a plurality of notches 100 are made in the bent portion 99, and the forceps raising unit 85 is put in the notches 100.
The raising wire 26 is inserted. The height H of the bent portion 99 is larger than the outer diameter h of the removable cover 168. In FIG. 22B, the forceps raising base 1
The packaging is such that 37 can be seen. Also, FIG.
In FIG. 2 (D), the tip end side of the thick paper 98 is folded back, and the folding back portion 101 protects the detachable cover 168 of the forceps raising unit 85.

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

[Procedure Amendment 12]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

[Procedure Amendment 13]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

[Procedure Amendment 14]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

[Procedure Amendment 15]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 13

[Correction method] Change

[Correction content]

[Fig. 13]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Ito 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Masaaki Nakazawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. A tip cover for an endoscope, wherein a hooking portion for hooking an extraction jig is provided on a part of a locking piece of a detachable cover at the tip of the endoscope.