JPH05123285A - Structure on nozzle at front end of endoscope - Google Patents

Abstract

PURPOSE:To constitute the nozzle in such a manner that the nozzle does not disengaged during use and can be removed and washed. CONSTITUTION:This endoscope has the nozzle 22 which is disposed near an observation window 15 of a front end 14 and injects water or air toward the observation window 15. An engaging hole 24 as an engaging recessed part is provided in the mounting part on the nozzle 22 side and a set screw 28 is engaged with this engaging hole 24. For example, a supporting cylinder 23 is arranged in a supply path outlet for the water, etc., of the front end 14 and the mounting part is mounted to this supporting cylinder 23 by the set screw 28, by which the nozzle 22 is made freely attachable and detachable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle mounting structure for spraying water or the like onto the tip of an endoscope.

[0002]

2. Description of the Related Art A CCD (Charge Coupled Device), which is a solid-state image sensor provided at the tip of a body cavity such as a thin tube
) Is well known, and an endoscope for observing only with optical means is well known. With this type of endoscope, the state inside the body to be observed can be observed and various treatment tools such as forceps are used. Various treatments such as incision, biopsy and recovery can be performed.

FIG. 3 shows the structure of a tip portion of a conventional side-viewing type electronic endoscope.
An observation window 2 and an illumination window 3 are arranged on the side surface of the tip 1.
A CCD provided inside the observation window 2 is connected. A nozzle 4 is arranged near the front side of the observation window 2, and water or air is ejected from the nozzle 4 toward the observation window 2. In addition, the observation window 2
A forceps port 5 communicating with a treatment instrument insertion channel provided inside is disposed near the lateral side of the forceps port 5.
A raising stand 6 that rotates in the direction is attached by a shaft 7, and a wire 8 is attached to the raising stand 6. Therefore, by operating the wire 8 with the upright operation knob of the operation portion, the treatment tool 9 drawn out from the forceps port 5 can be raised to a predetermined position.

According to such an endoscope, the observation window 2
The inside of the body to be observed can be observed via, and various treatments can be performed by the treatment instrument 9 that is led out from the forceps port 5 and is erected by the upright stand 6. At this time, water or air can be supplied from the nozzle 4 to the observation window 2, and the affected part can be observed or treated while cleaning the observation window 2.

[0005]

However, since the conventional endoscope has a structure in which the nozzle 4 itself cannot be removed when the residual substance or the like in the body is clogged in the gap between the nozzles 4, There is a problem that good cleaning cannot be performed. That is, as shown in FIG. 4, the nozzle 4 is provided with a supply passage 10 formed in the tip portion 1.
The cylindrical portion 4a is fitted to the
Further, it is attached by pressing the outer peripheral portion of the columnar portion 4a with a set screw 11. Nozzle 4 in endoscope
In the above, since it is necessary to prevent the nozzles from coming off during use, the nozzle 4 is adhered and pressed by the set screw 11 as described above. Therefore, even if the clearance between the nozzles 4 is clogged with a residue in the body, it is not possible to clean the inside by only cleaning from the outside.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a distal end portion of an endoscope which can be cleaned by removing the nozzle while preventing the nozzle from coming off during use. It is to provide a nozzle structure.

[0007]

In order to achieve the above-mentioned object, the present invention has an inner structure having a nozzle which is disposed in the vicinity of the observation window at the tip and which injects water or air toward the observation window. In the endoscope, an engaging recess is provided in the attachment portion on the nozzle side, and a screw is engaged with the engaging recess to attach the nozzle to the tip portion.

[0008]

According to the above construction, since the screw is firmly engaged with the engaging recess of the support, the nozzle does not come off during use, and the nozzle can be removed by loosening the screw at the time of cleaning. You can Therefore, the inside of the nozzle can be washed, and the clogging of dust in the nozzle can be satisfactorily eliminated.

[0009]

FIG. 1 is a sectional view of a distal end portion of an endoscope according to an embodiment to which the nozzle structure of the present invention is applied. In the drawing, an observation window 15 and an illumination are provided on an upper side surface of the distal end portion 14. Window 1
6, a forceps port (not shown), a stand, and the like are disposed behind the observation window 15. In the observation window 15,
A CCD 18 is connected via an optical system lens 17, and an optical fiber 20 is connected to the irradiation window 16.
Therefore, the light guided through the optical fiber 20 is irradiated by the irradiation window 1
6 is emitted toward the object to be observed, the image inside the object to be observed is captured by the CCD 18 through the observation window 15 and the optical system lens 17, and the image formed by the CCD 18 is an external TV monitor or the like. Will be observed in.

A nozzle 22 is provided in the vicinity of the front side of the observation window 15 together with a support cylinder 23. That is, a perspective view of the nozzle 22 and the support cylinder 23 is shown in FIG.
It is composed of 2B. This umbrella portion 22A has a tip 1
4 is arranged close to the outer peripheral wall, and the umbrella portion 22A and the outer peripheral wall form a nozzle, and the mounting portion 22B has an engagement hole 24 for engaging a set screw 28 described later. It is formed. On the other hand, the upper portion of the support cylinder 23 is cut obliquely, and an opening 25 for communicating with a supply path for water or the like formed in the tip portion 14 is formed in the middle portion. The nozzle 22 of the embodiment is capable of ejecting water or air toward the observation window 15.

As shown in FIG. 1, the nozzle 22 is mounted by first fitting the support cylinder 23 into the outlet passage 26 formed in the tip portion 14 with the opening 25 aligned with the supply passage. And firmly fixed with an adhesive or the like, and the mounting portion 2 of the nozzle 22 is attached to the outer periphery of the support cylinder 23.
Place 2B. In this case, as shown in FIG.
The tall wall surface of the support cylinder 23 and the above-mentioned mounting portion 22B are arranged on the side of the screw mounting hole 27 formed in the above, and the set screw 28 is screwed in and engaged with the engaging hole 24 of the mounting portion 22B. The engagement hole 24 is sized according to the tip shape of the set screw 28, and the nozzle 22 is firmly fixed to the tip portion by screwing in the set screw 28.

Further, the tip portion 14 of the embodiment is covered with a cap 30 exposing only the upper side surface of the drawing, and the cap 30 is fixed to the tip portion 14 with screws 31 after being covered. Is becoming Therefore, the nozzle 22
Can be easily attached and detached by removing the cap 30, and the nozzle 22 can be easily attached and detached during cleaning.

In the above embodiment, the support cylinder 23 is provided and the nozzle 22 is attached to the support cylinder 23. However, when the support portion corresponding to the support cylinder 23 is formed integrally with the tip portion 14, it is engaged. The nozzle 22 having the hole 24 may be detachably attached to the support portion of the tip portion 14. Further, although the mounting portion 22B of the nozzle 22 has a semi-cylindrical shape, it may have a cylindrical shape, and the engaging concave portion may not penetrate like the engaging hole 24. Instead, it can be in the shape of a groove.

[0014]

As described above, according to the present invention,
For example, a hole-shaped engaging recess is provided in the attachment portion on the nozzle side for ejecting water or air toward the observation window, and a screw is engaged with this engaging recess to attach the nozzle to the tip portion. , So that it does not come off during use,
There is an advantage that the nozzle can be detachable and the inside of the nozzle can be cleaned.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of an endoscope to which a nozzle structure of a distal end portion of an endoscope according to an embodiment is applied.

FIG. 2 is a perspective view showing a configuration of a nozzle and a support cylinder of the embodiment.

FIG. 3 is a view showing a side surface of an observation window at a tip portion of a conventional endoscope.

FIG. 4 is a cross-sectional view showing a configuration of a nozzle mounting portion of FIG.

[Explanation of symbols]

 1, 14 ... Tip part, 2, 15 ... Observation window, 4, 22 ... Nozzle, 22A ... Umbrella part, 22B ... Attachment part, 23 ... Support cylinder, 24 ... Engagement hole, 28 ... Set screw.

Claims (1)

[Claims] 1. An endoscope having a nozzle disposed near a viewing window at a tip end thereof for injecting water or air toward the viewing window, wherein an engaging recess is provided in a mounting portion on the nozzle side, A nozzle structure at the tip of an endoscope, characterized in that a nozzle is attached to the tip by engaging a screw in the engagement recess.