JPH07148107A - Top end part of endoscope - Google Patents

Abstract

PURPOSE:To provide a top end part of an endoscope with no risk of leakage at the joint part of the main body of the top end part and a top-end case both penetrated by a fluid pipe. CONSTITUTION:A cylindrical joint tube 23 is installed in projecting manner at the fluid pipe opening part on the side of the main body 1 of a top-end part, and a joint tube 33 is installed in dented manner at the fluid pipe opening part on the side of the top-end case 30 to enable the joint tube 23 to fit in.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distal end portion of an endoscope provided with a fluid conduit for sending a fluid such as air or water to the outside.

[0002]

BACKGROUND OF THE INVENTION After using an endoscope, it is desirable to brush the entire length of the fluid line by brushing it thoroughly.

However, nozzles are provided at the tip of the fluid conduit, and it is difficult to brush the outlet when the nozzles are still present.
Therefore, in some cases, the base portion of the nozzle is inserted into the outlet of the fluid pipe of the tip end main body and fixed with a screw or removably fitted.

However, in order to insert or fit the nozzle into the outlet of the fluid conduit as described above, the tip end main body must be deeply recessed. Then, when the nozzle is removed and cleaned after use, it is difficult to clean the inside of the recess, and dirt and the like tends to remain inside the recess, which is not only unsanitary, but may also infect the next patient. .

Therefore, the nozzle is formed in the tip case which is detachably attached to the tip body by elastic force, and the nozzle can be removed from the tip body at the same time by removing the tip case from the tip body (actually, fairness). 4-804
issue).

That is, the nozzle is integrally formed with the tip case made of an elastic material and can be easily attached to and detached from the tip body, and the tip body is simply provided with a fluid water supply port. As it is only opened, cleaning after use is easy.

[0007]

However, in the distal end portion of such a conventional endoscope, the distal end case made of an elastic material is attached to the distal end portion main body by elastic force, and the fluid conduit is at the distal end portion. Since the structure is provided so as to straddle the main body and the tip case, a part of the fluid leaked into the gap formed between the tip body and the tip case.

Therefore, for example, the amount of water or air to be jetted toward the surface of the observation window is reduced, and the ability to clean dirt on the surface of the observation window is reduced, so that a good observation image cannot be obtained, In some cases, a good observation image could not be obtained because the amount of jet water to be jetted toward the dirt attached to the object to be observed was reduced and the dirt could not be washed away.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a distal end portion of an endoscope in which fluid leakage does not occur from a connecting portion of the distal end body and the distal end case in which a fluid pipe is formed. And

[0010]

To achieve the above object, the distal end portion of the endoscope of the present invention is formed of a material having elasticity with respect to the distal end portion main body connected to the distal end of the insertion portion. A distal end case is detachably provided, and a fluid conduit for sending fluid outward is provided at the distal end portion of the endoscope in which the fluid conduit is formed so as to straddle the distal end body and the distal end case. A connection pipe is formed by projecting a cylindrical connecting tube in the fluid pipe opening on the side of the end, and the connection tube is fitted in the fluid conduit opening on the side of the tip case by mounting the tip case to the body of the tip. It is characterized in that holes are provided.

[0011]

Embodiments will be described with reference to the drawings. 1 to 6 show a first embodiment, FIG. 2 is a front view of a state in which a tip case 30 is attached to a tip portion main body 1, and FIG. 3 is a side sectional view of ABCD thereof. , FIG. 1 shows A-B-E-F
FIG. 4 is a side sectional view, FIG. 4 is a side sectional view showing a state in which the tip case is removed from the tip body 1, and FIG. 5 is a perspective view thereof.

As shown in FIG. 3, the tip body 1 is
The distal end of an insertion portion formed by an elongated flexible tube is connected to a distal end portion of a bending portion 2 that is provided to be bendable by remote control.

The tip portion main body 1 is formed in one block by a metal block portion 1a connected to the bending portion 2 and a plastic portion 1b fixed to the front surface side of the metal block portion 1a.

The endoscope of the present embodiment is a so-called front-viewing type endoscope for observing the front of the tube axis, and as shown in FIG. Window 11,
An illumination window 12 and a forceps channel outlet hole 13 are arranged. An air / water feeding nozzle 14 that opens toward the observation window 11 and a jet injection nozzle 15 that opens toward the observation direction are provided.

Inside the observation window 11, as shown in FIG. 3, the image entrance ends of the objective optical system 16 and the image guide fiber bundle 17 are arranged. The emission end of a light guide fiber bundle (not shown) is arranged inside the illumination window 12. The present invention can also be applied to so-called electronic endoscopes or rigid endoscopes that use a solid-state image sensor that electrically transmits an image.

As shown in FIG. 5 and the like, the tip end body 1
The front end portion of the plastic part 1b is formed in a shape in which the portion where the observation window 11 and the illumination window 12 are arranged protrudes forward in a semicircular shape. 1c is the protrusion.

Then, the observation window 11 and the illumination window 12 are arranged on substantially the same plane as the projecting surface 1d, and the air outlet 21, on the floor surface 1e which is formed as a plane down from the projecting surface 1d.
Water delivery port 22 and forceps channel port 2 not shown
4 are arranged in an opening. Reference numeral 23 is a connecting cylinder that is provided so as to protrude from the jet water outlet.

As shown in FIG. 1, the connecting cylinder 23 has its base side screwed into the jet water delivery port of the plastic portion 1b of the tip end body 1 and fixed by adhesion.
A water jet tube 28 for jet injection is connected from behind. The inner diameter of the connecting cylinder 23 is formed to have the same size as the inner diameter of the jet water supply tube 28.

The outer diameter of the projecting portion of the connecting cylinder 23 is formed in an inverse taper shape that gradually increases toward the front side, and all corners are formed into a rounded chamfered shape. As shown in FIG. 3, the air supply port 21 and the water supply port 22 are connected to an air supply tube 26 and a water supply tube 27 which are fitted and joined to the tip end body 1 from the rear side. A forceps channel (not shown) is connected to the forceps channel port 24.

On the outer circumference of the tip side of the plastic portion 1b of the tip body 1, there is provided a tip case 30 formed of an elastic material such as rubber in a substantially cylindrical shape at the tip of the tip body 1. It is attached detachably from the side. The shape and size of the inner peripheral surface of the tip case 30 are substantially the same as the shape of the outer peripheral surface of the tip body 1, and are formed in the same shape.

The tip case 30 has the same outer diameter as the curved portion 2, the intermediate surface 30a is in close contact with the floor surface 1e of the tip body 1, and the tip surface 30b is substantially the same as the protruding surface 1d of the tip body 1. They are formed in the same plane. However, only the nozzle 14 portion is formed so as to project forward in the shape of a small hemisphere.

The tip case 30 includes a tip body 1
A semicircular insertion hole 31 having substantially the same size and shape as the cross-sectional shape of the protrusion 1c is formed in alignment with the protrusion 1c, and the protrusion 1c is fitted into the insertion hole 31. As a result, the positioning in the rotational direction between the tip body 1 and the tip case 30 is performed.

As shown in FIGS. 2 and 3, the tip case 30 has a nozzle flow path which is in close communication with the air outlet 21 and the water outlet 22 when attached to the tip body 1. A groove 36 is formed on the back surface side in a groove shape. The outlet portion of the nozzle flow path 36 is the nozzle 1 described above.
4 and opens toward the surface of the observation window 11.

Further, a connection hole 33, into which the connection tube 23 is fitted, is aligned with the connection tube 23 which is connected to the water jet tube 28 for jet injection and is projected on the floor surface 1e of the tip end body 1 side. A jet injection nozzle 15 formed on the intermediate surface 30a of 30 and having a small diameter is directly communicated therewith.

The connecting hole 33 is formed in the same shape and size as the projecting portion of the connecting tube 23. When the projecting portion of the connecting tube 23 is fitted into the connecting hole 33, the two are closely attached without any gap. It has become.

In such a close contact state, when water is sent out from the jet injection water supply tube 28 to the jet injection nozzle 15, the water does not leak from the connecting portion between the connecting cylinder 23 and the connecting hole 33 to the outside.

Therefore, all the water delivered from the jet jet water supply tube 28 is jet jetted from the nozzle 15 and the dirt and the like adhering to the object to be observed can be washed away.

As shown in FIGS. 1, 2 and 4, floor 1
On the outer peripheral surface of the plastic portion 1b of the front end portion main body 1 on the rear side of e, a retaining projection 29 is provided all around.
Correspondingly, a retaining recess 39 having substantially the same size and shape as the retaining protrusion 29 is formed in the tip case 30.
Is formed in a groove shape all around the inner peripheral surface.

Therefore, by engaging the convex portion 29 and the concave portion 39, the tip case 30 is fixed to the tip case 1 so that the tip body 30 does not come out of the tip case 30.
The tip case 30 needs to be elastically deformed by applying a large force in order to remove it.

In the distal end portion of the thus constructed endoscope, when the distal end case 30 is covered from the tip side of the distal end portion main body 1, the connecting hole 33 is expanded by the head portion of the connecting cylinder 23, While the tip case 30 is elastically deformed, the connection hole 33
The connection tube 23 is inserted therein.

Then, the convex portion 29 and the concave portion 39 for preventing coming off
When is engaged, at the same time, the connection tube 23 is inserted into the connection hole 33.
The protruding portions of are fitted into each other and are in close contact with each other, so that they are connected so as not to leak water.

On the contrary, if a little force is applied to the tip case 30 in the direction of removing the tip case body 1 from the tip end body 1 (axial direction), the retaining projections 29 and the recesses 39 are disengaged from each other, and the connecting tube is removed. 23 also comes out from the connection hole 33 while elastically deforming the tip case 30.

After using the endoscope, the tip case 30 is removed, and as shown in FIG. 6, the cleaning brush is inserted through the jet water supply tube 28 and the connecting tube 23, and the inside thereof is inserted. It can be cleaned over the entire length by brushing. Similarly, the inside of the air supply tube 26 and the inside of the water supply tube 27 can be brushed over the entire length.

FIG. 7 shows a second embodiment of the present invention, in which the air outlet 21 and the water outlet 22 of the floor surface 1e of the tip end main body 1 are the same as the connecting cylinder 23 of the first embodiment. Connection tube 2
3a and 23w are projected. Reference numeral 20 is a jet injection water delivery port. A connection hole (not shown) having a shape corresponding to the tip case 30 is formed on the side of the tip case 30. By doing so, it is possible to prevent air and water from leaking.

In this embodiment, the protruding lengths of the two connecting cylinders 23a and 23w are made different so that the connecting holes can be easily inserted and removed. In addition, you may project a connection cylinder in all three pipe lines of air supply, water supply, and water supply for jet injection.

FIG. 8 shows a third embodiment of the present invention, in which a large connecting projection 123 having three openings, that is, an air outlet 21, a water outlet 22 and a jet water outlet 25 is formed.
Is projected from the floor surface 1e of the tip portion main body 1. A connection hole (not shown) having a corresponding shape is formed on the tip case 30 side.

[0037]

According to the present invention, by attaching the tip case formed of an elastic material to the tip body, the connecting tube projecting from the tip body is bored in the tip case. Since the fluid pipe is connected by being fitted in the connection hole, fluid leakage does not occur from the connection part, and it is possible to reliably wash the observation window and the observed part to obtain a good observation image. it can.

[Brief description of drawings]

FIG. 1A in a state in which the tip case of the first embodiment is attached.
-B-E-F side sectional drawing.

FIG. 2 is a front view showing a state in which the tip case of the first embodiment is mounted.

FIG. 3A in a state in which the tip case of the first embodiment is attached.
-B-C-D side sectional drawing.

FIG. 4 is a side sectional view taken along the line A-B-E-F of the first embodiment with the tip case removed.

FIG. 5 is a perspective view of the first embodiment with the tip case removed.

FIG. 6 is a partial side sectional view of the first embodiment in a cleaning state.

FIG. 7 is a perspective view showing a state in which a tip case of the second embodiment is removed.

FIG. 8 is a perspective view showing a state in which a tip case of the third embodiment is removed.

[Explanation of symbols]

 1 tip part main body 15 jet injection nozzle 23 connection tube 28 water jet tube for jet injection 30 tip case 33 connection hole

Claims (1)

[Claims] 1. A tip case formed of an elastic material is detachably provided to a tip body connected to a tip of an insertion portion, and a fluid conduit for sending fluid outward is provided. At the distal end of the endoscope bored across the distal end main body and the distal end case, a tubular connecting cylinder is projected at the fluid conduit opening on the distal end main body side, and A distal end portion of an endoscope, wherein a connection hole into which the connection cylinder is fitted by mounting the distal end case on the distal end portion main body is bored in the fluid conduit opening.