JPH10118014A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope with a higher mountability of a tip cover on a tip structural part despite a relatively simple structure. SOLUTION: A treating device erecting base 15 is provided at a tip structural part 5 of an inserting part while a tip cover 20 comprising an elastic material is detachably mounted on the tip structural part 5. In this case, a slope part 17 is so arranged to be higher from the tip side of the inserting part to the rear end side thereof when erected on the surface of the treating device erecting base 15. Therefore, when the tip cover 20 is pushed to be mounted on the tip structural part 5 of the inserting part, the tip cover 20 is gradually pushed wider along the slope part 17 of the treating device erecting base 15. This eliminates time and labor for the deformation of the tip cover 20 by pulling it with a finger or the like thereby simplifying the mounting of the tip cover 20 on the tip structural part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope in which a treatment instrument raising table is provided at a distal end of an insertion portion, and a distal end cover made of an elastic material is detachably mounted on the distal end.

[0002]

2. Description of the Related Art Medical endoscopes such as a gastroscope and a duodenal scope not only insert an insertion part into a body cavity of a patient to observe an affected part, but also collect tissue using a treatment tool such as forceps. It is configured to be able to perform medical treatment. For this reason, a channel for inserting a treatment tool such as forceps is formed from the operation section to the distal end of the insertion section. At the distal end of the insertion section, a treatment tool such as forceps introduced through the channel is guided toward a desired diseased part. A treatment tool raising table to be operated is provided, and the treatment tool is led out in a desired direction by manipulating the raising amount of the treatment tool raising table.

The treatment instrument raising device basically includes a treatment instrument raising table which is rotatable about a raising shaft disposed at a distal end portion of an insertion portion, an operation wire having a distal end connected to the treatment tool raising table. An operator operates the operating wire with the operating unit to move the operating wire up and down, thereby changing the elevating angle of the treatment instrument erecting base and guiding the treatment instrument toward a desired direction.

By the way, when the endoscope is used, a fitting portion between the raising shaft of the treatment tool raising table and the distal end component, an operation wire fixing member connected to the end of the operation wire, and the treatment tool raising table are used. The liquid material in the body cavity easily invades the fitting portion. Therefore,
After using the endoscope, it was necessary to clean (disinfect) the endoscope. However, since the operation wire fixing member and the portion of the raising shaft are complicated and located deep, it is difficult to clean these portions. It was troublesome.

Therefore, in Japanese Unexamined Patent Publication No. Hei 7-32001, a distal end cover is detachably attached to the distal end portion of the insertion portion, and the engagement between the distal end cover and the distal end portion is projected to the distal end portion. An endoscope has been proposed in which an engaging hole provided on the rear end side of the front cover is fitted into the provided engaging portion.

[0006]

However, in the endoscope disclosed in Japanese Patent Application Laid-Open No. Hei 7-32001, the locking portion for the distal end cover provided on the distal end component is provided with the outer surface of the distal end component. When the distal end cover slides from the distal end side of the distal end component and is mounted, the end of the distal end cover abuts the locking portion. Therefore, when attaching the tip cover,
The tip cover must be deformed so as to be pulled up with a finger, and the locking hole of the tip cover must be fitted into the locking part.This work is quite troublesome, and it takes a lot of time to attach the tip cover. I was

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an endoscope which has a relatively simple structure and has a good fit of a tip cover to a tip component. I have.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an endoscope in which a treatment instrument raising base is provided at a distal end of an insertion portion, and a distal end cover made of an elastic body is detachably attached to the distal end. In addition, a slope is provided which rises from the distal end side to the rear end side of the insertion portion when raised on the surface of the treatment instrument raising table. Therefore, when the distal end cover is pushed into the distal end portion of the insertion portion and attached, the distal end cover can be gradually pushed and spread along the slope of the treatment instrument raising base. This eliminates the need for time and effort, and simplifies the mounting of the tip cover on the tip component.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of the distal end portion of the endoscope with the distal end cover removed from the distal end portion of the endoscope. FIGS. 2 and 3 show the procedure for attaching the distal end cover to the distal end body of the distal end portion of the endoscope. 4 (a) is a plan view of the distal end cover, FIG. 4 (b) is a rear view of the distal end cover, and FIG. 5 is a perspective view schematically showing the entire endoscope. FIG.

The endoscope according to the present embodiment is an electronic endoscope 1. As shown in FIG. 5, the endoscope 1 mainly includes an elongated and flexible insertion portion 2 and a hand near the insertion portion 2. An operation unit 3 which is located at a side end and also serves as an operator's grasping unit, and a universal unit which is provided at an end thereof with a light source device (not shown) extending from one side of the operation unit 3 and a connector (not shown) connected to a video processor. And code 4.

The insertion portion 2 has a tip portion (tip portion) 5 in order from the tip side, a bending portion 6 having a plurality of bending pieces connected in series as a core material and capable of bending vertically and horizontally, and having flexibility. The flexible tube 7 is connected. By operating the bending operation knob 8 provided on the operation section 3, the bending section 6 is bent so that the distal end forming section 5 is directed in a desired direction.

As shown in FIG. 1, the distal end portion 5 of the insertion portion 2 has a distal end body 9 made of an electrically insulating material such as polysulfone. The distal end body 9 is formed by continuously forming a semi-cylindrical portion 9c having a flat upper surface 9b in front of a base end portion 9a, and a raising chamber 10 is provided on one side of the semi-cylindrical portion 9c. Notches are formed.

On the upper end surface 9b of the semi-cylindrical portion 9c of the distal end body 9, an objective lens 11 having a viewing direction which is a side perpendicular to the axial direction (longitudinal direction) of the insertion portion 2, and an illumination light in this viewing direction. An illumination lens 12 for emitting and illuminating is provided adjacently in the longitudinal direction. Further, a cleaning liquid for cleaning the surface of the objective lens 11 is supplied to the base end side of the distal end body 9, and air is supplied for removing water droplets adhered to the surface of the objective lens 11 or supplied to the body cavity. An air supply / water supply nozzle 13 for performing air supply or the like is provided. The air / water nozzle 13 is an air / water pipe (not shown) provided in the insertion section 2.
Communicate with

Although not shown, an image pickup device such as a CCD is arranged in the tip end body 9 at a position where an image of the objective lens 11 is formed. The image sensor photoelectrically converts the image formed by the objective lens 11. This image signal is transmitted to a connected video processor or camera control unit via a universal cable 4 or the like through a signal cable connected to the image sensor. The video processor or camera control unit performs signal processing,
The image signal is converted into a standard video signal, and the endoscope image formed on the image sensor is reproduced and displayed on a color monitor (not shown).

Although not shown, a distal end surface of the light guide fiber bundle is disposed inside the illumination lens 12 in the distal end body 9. The light guide fiber bundle is inserted into the universal cord 4 through the insertion section 2 and the operation section 3, and the light guide fiber bundle at the end of the universal cord 4 is connected to a light source device (not shown) to thereby provide a light source. The illumination light supplied from the device is transmitted, and the illumination light is emitted from the tip surface through the illumination lens 12 in the direction of the field of view of the objective lens 11.

The objective lens 11, the illumination lens 12, the air supply
In a raising chamber 10 located on the side of the semi-cylindrical portion 9c where the water supply nozzle 13 is provided, a treatment tool raising table 15 pivotally supported by a pivot pin 14 is installed. That is, the treatment instrument raising table 15
Is located at the bottom of the raising chamber 10 at the base end side.
The upper end portion is mounted so as to swing back and forth. The distal end of the treatment instrument raising table 15 is connected to the distal end of the treatment instrument raising wire 16 inserted through the insertion section 2.

The treatment tool raising table 15 has a treatment tool guide surface formed on the front side wall thereof. The treatment tool guide table 15 is provided inside the insertion portion 2 of the distal end body 9 so as to face the treatment tool guide surface. A treatment instrument channel opening (not shown) communicating with the treatment instrument channel (not shown) is formed. The projecting direction of the treatment tool (not shown) protruding from the treatment tool channel opening is regulated by the inclination angle (raising angle) of the treatment tool raising base 15 so that the treatment tool is led out in a desired direction. I have. The front side of the treatment instrument raising table 15 in the raised state, that is, the wall surface opposite to the treatment instrument guide surface forms an inclined surface portion 17 that curves from the front to the rear from the middle portion to the distal end portion.

Further, a distal end cover 20 made of an elastic material such as silicon rubber is fitted into the distal end body 9. The distal end cover 20 is formed in a bottomed cylindrical shape that wraps around the distal end portion main body 9, and the distal end portion has a hemispherical roundness. The distal end cover 20 is configured to fit into the distal end main body 9 from its opening, and the opening is fitted to the base end of the distal end main body 9. A flat fitting surface 22 is formed at the base end of the tip body 9, and the inner peripheral surface 21 of the opening of the tip cover 20 is formed so as to be in close contact with the shape including the fitting surface 22. . The distal end body 9 has a stepped end surface 24 to which the open end 23 of the distal end cover 20 contacts.

On the fitting surface 22 of the distal end body 9, a locking projection 26 as a locking portion is provided so as to protrude. When the distal end cover 20 is fitted to the distal end body 9, the locking convex portion 26 is fitted and locked to the distal end cover 20 in accordance with the position of the locking convex portion 26. Locking hole 2 as part
7 are formed. The locking projection 26 is located rearward and forward of the treatment tool raising table 15 and is located on an extension of the treatment tool raising table 15 in the direction of the rotation surface.

An observation / treatment opening 28 is formed in the upper surface of the distal end cover 20 so as to expose the objective lens 11, the illumination lens 12, the air / water nozzle 13 and the treatment instrument raising table 15. 4, thick portions 29 are partially provided in the left and right portions on the rear end side of the opening 28 of the front end cover 20, and the front end cover 20 is attached to the front end main body 9. At this time, the tip cover 20 is prevented from being excessively deformed.

The treatment instrument raising wire 16 is inserted into the insertion section 2, and its base end is connected to a raising operation mechanism incorporated in the operation section 3. The raising operation mechanism is operated by a treatment tool raising operation knob 31 provided on the operation section 3, and by performing an operation of rotating the treatment tool raising operation knob 31, the treatment tool raising wire 16 is pulled. Treatment instrument raising table 15
Of the treatment tool can be changed to change the direction in which the distal end of the treatment tool projects.

The base end of the treatment instrument channel provided in the insertion section 2 communicates with a treatment instrument insertion port 32 provided in the operation section 3 so that a treatment instrument can be inserted through the treatment instrument insertion port 32. Like that. As shown in FIG. 5, the bending operation knob 8 and the treatment instrument start-up are provided at the end of the operation unit 3 on the base end side (the right side in FIG. 5) of the holding unit main body 33 held by the user. In addition to the upper operation knob 31, an air supply / water supply button 35 for performing an air supply / water supply operation, a suction button 36 for performing a suction operation, and a video processor or a camera control unit for image control such as an instruction of a still image. A plurality of operation switches 37 for performing an instruction operation are provided.

Next, a method of attaching the distal end cover 20 to the distal end body 9 will be described. First, before attaching the distal end cover 20 to the distal end portion main body 9, the grip portion main body 3
The treatment tool raising operation knob 31 provided at 3 is rotated to raise the treatment tool raising table 15. At this time, the slope 17 of the treatment instrument raising table 15 is formed obliquely so as to be higher from the front end side to the rear end side of the insertion section 2. In this state,
When the distal end cover 20 made of an elastic material such as silicon rubber is fitted from the distal end side of the distal end portion main body 9 so as to be fitted therein, the edge of the inner peripheral surface 21 of the distal end cover 20 is inclined on the slope of the treatment instrument raising base 15 in the middle. It hits the part 17.

Then, when the tip cover 20 is further pushed in, as shown in FIG.
Numeral 1 fits in while being elastically deformed along the slope 17 of the treatment instrument raising table 15 while being pushed and spread. Therefore,
The open end 23 of the distal end cover 20 is the fitting surface 2 of the distal end body 9.
The interference between the inner peripheral surface 21 of the tip cover 20 and the locking projection 26 is reduced immediately before passing over the locking projection 26 protruding from the front cover 2. Overcoming it.

As shown in FIG. 3, when the open end 23 of the distal end cover 20 is completely mounted with the open end 23 abutting on the step end surface 24 of the distal end main body 9, the locking convex portion 26 is in contact with the distal end cover 2.
It is fitted into the 0 locking hole 27 and locked. In this completely mounted state, the expanded front cover 20 returns to its original state due to its elasticity, and the inner peripheral surface 21 of the front cover 20 comes into close contact with the fitting surface 22 of the front end body 9. The locking height between the locking hole 26 and the locking hole 27 of the tip cover 20 can be set to a sufficient level, which is effective in preventing the tip cover 20 from falling off from the tip body 9.

Since a thick portion 29 is provided at the rear end side of the opening 28 of the front cover 20, the front cover 2
0 is prevented from being excessively deformed in the process of attaching the front cover 9 to the front end body 9.
Is prevented from being folded, for example. That is,
When the tip cover 20 is attached to the tip body 9, the periphery of the opening 28 of the tip cover 20 is a free end and is easily deformed. At the time of mounting, the peripheral edge of the opening 28 is not easily deformed. For this reason, the tip cover 20 with respect to the tip body 9
Is easy to attach. The thickened portion may be any portion that is easily deformed. For example, the thickened portion may be provided at the opening peripheral portion on the opening end 23 side of the front end cover 20.

In the endoscope 1 of the present embodiment configured as described above, the distal end cover 20 is mounted on the distal end main body 9 with the treatment instrument raising stand 15 provided on the distal end main body 9 raised. At this time, the inner peripheral surface 21 of the distal end cover 20 is pushed out along the inclined surface portion 17 formed from the distal end side to the rear end side formed on the treatment instrument raising stand 15, and the locking projection 26 is provided with a locking hole. When the user attaches the distal end cover 20, the frequent work such as pulling up the distal end cover 20 and fitting the locking hole 27 of the distal end cover 20 into the locking projection 26 is unnecessary. It becomes easy for the user to use.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a perspective view of the distal end portion of the endoscope with the distal end cover removed from the distal end portion of the endoscope. FIG. 7 is a dimensional relationship of the distal end portion of the endoscope with the distal end cover removed from the distal end portion of the endoscope. 8 to 10 are explanatory views showing the order in which the distal end cover is attached to the distal end body of the endoscope.

The differences from the first embodiment will be mainly described. The tip cover 40 of the second embodiment will be described.
Is an insert member 42 formed of a rigid material such as stainless steel in a lumen of a substantially hemispherical tip portion.
Are integrally formed as inserts. The insert member 42 is formed so as to cover a part of the distal end portion of the distal end body 9 of the endoscope 1. An engaging portion 45 for detachably engaging and fixing to the distal end body 9 of the endoscope 1 is provided on the inner surface of the distal end of the insert member 42. The locking portion 45 has a locking recess 46 formed on the inner surface of the distal end of the insert member 42 and a locking wall formed by leaving a space between the locking recess 46 and the main body member 47 of the distal end cover 40. A locking projection 49 of the distal end main body 47, which will be described later, is inserted from the bottom of the locking recess 46 to the side opposite to the treatment instrument raising table 15 to engage with the locking wall 48. ing.

On the other hand, the semi-cylindrical portion 9c of the rigid tip portion main body 9
An L-shaped locking projection 49 is provided on the distal end surface as an engaging means for detachably fixing the distal end cover 20 by engaging with the locking portion 45. The locking projection 49 has a bent tip protruding toward the side opposite to the treatment instrument raising table 15.

The distal end body 9 adjacent to the treatment instrument channel opening (not shown) and near where the treatment instrument raising wire 16 is disposed is provided with an insulating block 51 to prevent the high-frequency knife from being cut. Is buried. Tip body 9
The base end portion 9a has a substantially cylindrical insulating member 52 so as to surround a part of the distal end body 9 and the insulating block 51.
Are fitted and mounted. Therefore, a step is formed between the outer peripheral surface 53 of the distal end portion main body 9 and the cover contact surface 54 of the insulating member 52, and the open end 23 of the distal end cover 20 is easy to cross over the end surface of the step. The tapered portion 55 is provided with an epoxy-based adhesive to form a slope portion for guiding the front end cover mounting.

A flat fitting surface 56 is formed on the upper surface of the insulating member 52, and the inner peripheral surface 21 of the opening of the front end cover 20 is formed in a shape conforming to the shape including the fitting surface 56. I have. At the tip of the mating surface 56, a projection-shaped retaining portion 5 is provided.
7 are formed and are engaged with the edge of the observation / treatment opening 28 in the distal end cover 20 in the mounted state. The retaining portion 57 is provided at a position facing the treatment instrument raising table 15. In other words, the treatment tool raising table 15 is located at a position closer to the rear than the position of the treatment tool raising table 15 and is located on an extension of the treatment tool raising table 15 in the direction of the rotation surface.

Next, a method of attaching the distal end cover 40 to the distal end body 9 will be described. First, before attaching the distal end cover 40 to the distal end portion main body 9, the grip portion main body 3
The treatment tool raising operation knob 31 provided at 3 is rotated to raise the treatment tool raising table 15. At this time, as shown in FIG. 7, the slope portion 17 of the treatment instrument raising base 15 is formed to be oblique so as to increase from the front end side to the rear end side of the insertion section 2.

In this case, the slope 17 of the treatment tool raising table 15
The length in the radial direction of the insertion section 2 measured from the distal end of the insertion section 2 to the lower outer peripheral surface 53 of the distal end body 9 is defined as “a”, and the rear end of the slope section 17 of the treatment instrument raising stand 15 is defined as “a”. When the length in the radial direction of the insertion portion 2 measured from the portion to the lower outer peripheral surface 53 of the distal end body 9 is “b”, and the inner diameter of the inner peripheral surface 21 of the distal end cover 40 is “c”, The relationship between the three dimensions is a <c <
b. Also, the inner peripheral surface 21 of the tip cover 40
Is set to be larger than the diameter of the outer peripheral surface 53 of the distal end body 9 and smaller than the diameter of the cover contact surface 54 of the insulating member 52.

In this state, when the distal end cover 40 made of an elastic material such as silicon rubber is fitted from the distal end side into the distal end body 9 so as to be fitted therein, the distal end side of the treatment instrument raising base 15 and the distal end portion are fitted in the middle. Since the dimensional relationship between the length a in the radial direction with respect to the outer peripheral surface 53 of the main body 9 and the inner diameter c of the inner peripheral surface 21 of the distal cover 40 is a <c, the end surface portion 23 of the distal cover 40 is treated. It hits in the middle of the slope part 17 of the raising table 15 (refer FIG. 8).

When the front end cover 40 is further mounted, the end face portion 23 is expanded along the front end body 9 while undergoing elastic deformation (see FIG. 9). Since the rear end side of the slope portion 17 of the treatment instrument raising table 15 is higher than the retaining portion 57 projecting from the insulating member 52, the distal end cover 4
After the end surface portion 23 of the zero crosses the rear end side of the slope portion 17, the opening end surface portion 23 does not interfere with the retaining portion 57 and the insulating member 52
Into the mating surface 56 of the main body. The lower end edge of the open end surface portion 23 of the front cover 20 is guided by the slope of the tapered portion 55 and is hardly caught.

Next, when the tip of the locking projection 49 of the tip cover 40 is located in the locking recess 46 by the abutment of the insert member 42 of the tip cover 40, the tip cover 4
It is gripped from the outside of the 0 insert member 42 and deformed so as to be inclined in the direction opposite to the position where the treatment instrument raising table 15 is located. And if the deformation of the tip cover 40 is restored,
The L-shaped locking projection 49 at the tip of the tip body 9 is hooked on the locking wall 48 of the tip cover 40, and the locking recess 32 is formed.
Fit into Then, the opening end surface portion 23 of the tip cover 40
Abuts against the step-shaped mouth end face 24 provided at the base end of the insulating member 52. Then, the retaining portion 57 of the distal end cover 40 is closely fitted to the periphery of the observation / treatment opening 28 to be in an engaged state. In this operation, the operation of attaching the distal end cover 40 to the distal end portion main body 9 of the endoscope 1 is completed, and the state shown in FIG. 10 is obtained.

At this time, the outer diameter of the contact surface 54 of the insulating member 52 is set to be larger than the inner diameter of the tip cover body 47 made of an insulator. Since the body member 47 of the body 40 is always kept in close contact, the fluid in the body cavity does not enter the gap between the insulating member 52 and the body member 47 of the distal end cover 40, so that the high-frequency current leaks to the outer surface via the fluid in the body cavity. Can be prevented.

In the endoscope 1 of the present embodiment configured as described above, the outer diameter of the contact surface 54 of the insulating member 52 is set to be larger than the inner diameter of the main body member 47 of the distal end cover 40 to reduce the leakage of high-frequency current. When the distal end cover 40 is mounted on the distal end main body 9 in a state where the treatment instrument raising base 15 provided on the distal end main body 9 is also raised in the endoscope 1 which is preventing the treatment, the treatment instrument raising base 15 is attached. After the inner peripheral surface 21 of the main body member 47 of the distal end cover 40 is pushed out along the slope portion 17 that becomes higher from the front end side to the rear end side and passes over the slope portion 17, the insulating member 52 adheres. As the user naturally falls over the retaining portion 57 on the surface 54,
When attaching 0, frequent work such as pulling up the main body member 47 of the distal end cover 40 and climbing over the retaining portion 57 of the insulating member 52 is not required, and the user can use it easily.

Furthermore, in this embodiment, the endoscope is an electronic endoscope, but the endoscope is not limited to the electronic endoscope, but may be a fiberscope.
Further, the raising position of the treatment instrument raising table is not limited to the maximum raising position, and may be a position intermediate between the maximum raising position and the inverted position.

[Supplementary Notes] (1) In the endoscope in which a treatment instrument raising base is provided at the distal end of the insertion section and a distal end cover made of an elastic body is detachably attached to the distal end, An endoscope having a slope that rises from the distal end side to the rear end side of the insertion portion when the endoscope is raised. (2) When the distal end cover is attached to the distal end of the insertion portion, a part of the inner peripheral surface of the distal end cover and a part of the outer surface of the proximal end side of the distal end are in close contact with the entire circumference. Endoscope according to item 1. (3) In an endoscope provided with a treatment instrument raising table at the distal end of the insertion portion, and a distal end cover made of an elastic body is detachably attached to the distal end, the treatment instrument raising table is raised on the surface of the treatment instrument raising table. A slope that increases from the distal end to the rear end of the insertion portion, and the maximum height of the slope protrudes outward from the base outer surface of the distal end to which the distal cover is attached. An endoscope characterized in that it is configured to have a height.

(4) When a tip cover is attached to the tip,
2. The endoscope according to claim 1, wherein a part of an inner peripheral surface of the distal end cover and a part of an outer surface on a base end side of the distal end part are in close contact with the whole circumference. (5) In an endoscope in which a treatment instrument raising table is provided at the distal end of the insertion portion and a distal end cover made of an elastic body is detachably attached to the distal end, the treatment instrument raising table is raised on the surface of the treatment instrument raising table. Sometimes, a slope that increases from the distal end side to the rear end side of the insertion portion is provided, and the length of the insertion portion radial direction from the slope front end portion to the distal end outer surface when the treatment instrument raising table is raised is a When the length in the radial direction of the insertion portion from the rear end of the slope to the outer surface of the distal end portion when the treatment tool raising table is raised is b, and the inner diameter of the rear end side inner peripheral surface of the distal end cover is c. , The a, b,
An endoscope, wherein a dimensional relationship of c is such that a <c <b. (6) When the distal end cover is attached to the distal end portion of the insertion portion, a part of the inner peripheral surface of the distal end cover and a part of the outer surface of the proximal end side of the distal end portion are in close contact with the entire circumference. Endoscope according to item 5.

(Purpose of Supplementary Notes 2, 4, and 6) As a method for improving the mounting property of the tip cover, a gap is provided between the inner peripheral surface of the tip cover near the locking portion and the outer surface of the tip component. However, it is conceivable that if a gap is provided, the locking height between the distal end cover and the distal end component decreases, so that the fixing force of the distal end cover to the distal end component decreases. Alternatively, if a treatment using a high-frequency current is performed, the high-frequency current may leak to the outer surface side through the fluid in the body cavity that has entered the gap between the distal end cover and the distal end component. When the surface is in contact with the inner wall of the body cavity, there is a possibility that current flows to the inner wall of the body cavity. The inventions of Supplementary Notes 2, 4, and 6 have been made in view of the above circumstances, and have an endoscope that has a sufficient fixing force to the distal end component of the distal end cover and performs a treatment using a high-frequency current. It is an object of the present invention to provide an endoscope having a detachable distal end cover that can be easily attached to and detached from a distal end component that prevents high frequency current from leaking to the outer surface of the distal end.

(8) An endoscope in which a distal end cover made of an elastic body is detachably attached to a distal end portion of an insertion portion, wherein at least a part of an outer peripheral surface of the distal end cover is thickened. Endoscope. (9) An endoscope in which an end cover made of an elastic body is detachably attached to a distal end portion of an insertion portion, wherein at least a part near an opening of the end cover is thickened. (10) In a side-view endoscope in which a distal end cover made of an elastic body is detachably attached to a distal end portion of the insertion portion, at least a part of an observation window opening of the distal end cover is made thick. Endoscope. (11) In a side-viewing type endoscope in which a distal cover made of an elastic body is detachably attached to a distal end portion of an insertion portion, a base end side of an observation window opening of the distal cover is made thick. Endoscope.

[0045]

As described above, according to the present invention, the mountability of the distal end cover to the distal end body can be improved with a simple structure. When mounting the cover, raise the raising stand, and push in from the tip side of the tip cover insertion part, so that the inner circumference of the tip cover gradually expands along the slope,
The cover can be easily mounted without requiring an operation of pulling and deforming the cover as in the related art.

[Brief description of the drawings]

FIG. 1 is a perspective view of a distal end portion of an endoscope in which a distal end cover is removed from a distal end portion of an endoscope according to a first embodiment.

FIG. 2 is a side view of the distal end component section showing the procedure for attaching the distal end cover to the distal end portion main body in the distal end component section of the endoscope according to the first embodiment.

FIG. 3 is a side view of the distal end component section showing a procedure for attaching the distal end cover to the distal end portion main body in the distal end component portion of the endoscope according to the first embodiment.

FIG. 4A is a plan view of a distal end cover of the endoscope according to the first embodiment, and FIG. 4B is a rear view of the distal end cover.

FIG. 5 is a perspective view schematically showing the entire endoscope according to the first embodiment.

FIG. 6 is a perspective view of a distal end portion of the endoscope with a distal end cover removed from a distal end portion of the endoscope according to the second embodiment.

FIG. 7 is a side view of a partially sectioned endoscope distal end portion showing a dimensional relationship of the endoscope distal end portion with a distal end cover removed from a distal end portion of the endoscope according to the second embodiment.

FIG. 8 is a side view of the distal end component section showing a procedure of attaching the distal end cover to the distal end body of the distal end component section of the endoscope according to the second embodiment.

FIG. 9 is a side view of the distal end component section showing the procedure for attaching the distal end cover to the distal end portion main body in the distal end component portion of the endoscope according to the second embodiment.

FIG. 10 is a side view of the distal end portion, showing a procedure of attaching the distal end cover to the distal end body of the distal end portion of the endoscope according to the second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... endoscope, 2 ... insertion part, 3 ... operation part, 5 ... tip part, 9 ... tip part main body, 10 ... raising room, 15 ... treatment tool raising base, 20 ... tip cover, 17 ... slope part , 40 ... Tip cover.

Claims (1)

[Claims] In an endoscope, a treatment instrument raising table is provided at a distal end portion of an insertion section, and a distal end cover made of an elastic body is detachably attached to the distal end portion. An endoscope, wherein a slope is provided which rises from the front end side to the rear end side of the insertion section when the insertion section is raised.