JPH11216101A - Tip part of strabismus type endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tip part of strabismus type endoscope hard to occur a halation in observation of body cavity and able to obtain good observation image. SOLUTION: A treating tool erecting stand 17 that is for changing the direction of projection of the top part of a treating tool, which is inserted into a treating tool insert channel 16, is stored in a groove 15 formed above a lighting window 7 to rotate against a support axis 18 by remote control. The tip face of a top cap 3 is formed, on the whole, flush with the slop 5 of a top part main body 1. But a projection 20 which projects, for example, 1 to 2 mm from the face of the slop 5 is formed in a part is located oppositly to the observation window when being viewed from the lighting window 7.

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 a perspective endoscope in which a distal end surface of a distal end body is formed obliquely.

[0002]

2. Description of the Related Art In a perspective endoscope in which an observation optical axis is directed obliquely forward with respect to the axial direction of a distal end body,
Generally, a distal end surface of a distal end main body provided at a distal end of an insertion portion is formed obliquely with respect to an axial direction of the distal end main body, and an observation window and an illumination window are arranged side by side on the inclined surface.

[0003]

SUMMARY OF THE INVENTION A perspective endoscope can easily observe a part which is difficult to observe with either a forward-looking type or a side-viewing type endoscope. Have been.

[0004] However, the oblique endoscope has a drawback in that, when inserted into a body cavity, when the obliquely formed distal end surface approaches the mucous membrane surface, halation occurs on the observation screen, making it difficult to observe. ing.

[0005] As shown schematically in FIG. 5, the mucosal surface 10 is located at a portion opposite to the observation window 92 when viewed from the illumination window 91.
When 0 is extremely close, the brilliantly illuminated illumination window 91 is reflected on the mucous membrane surface to become a secondary point light source 200, and as shown in FIG.
It is considered that halation 300 is caused inside.

Accordingly, an object of the present invention is to provide a distal end portion of a perspective endoscope in which halation hardly occurs during observation in a body cavity and a good observation image can be obtained.

[0007]

In order to achieve the above object, a distal end portion of a perspective endoscope according to the present invention is configured such that a distal end surface of a distal end body provided at a distal end of an insertion portion has the distal end surface of the distal end body. In a perspective endoscope formed obliquely with respect to the axial direction, and an observation window and an illumination window are arranged side by side on the slope, the observation window is near the illumination window and viewed from the illumination window. A projection protruding forward from the surface of the slope is provided on the opposite side.

A tip cap made of an electrically insulating material surrounding the outer periphery of the tip body may be provided, and the projection may be formed by locally projecting the tip cap from the surface of the slope. .

[0009] The projection may protrude from the surface of the inclined surface by a height of 0.5 to 3 mm, more preferably 1 to 2 mm, and the projection reflects at least a surface of the projection facing the illumination window. Preferably, a preventive treatment has been performed.

[0010]

Embodiments of the present invention will be described with reference to the drawings. 3 is a plan view of the distal end portion of the insertion portion of the endoscope, FIG. 1 is a sectional view taken along line II, and FIG. 2 is a sectional view taken along line II-II.

A distal end main body 1 made of, for example, stainless steel is connected to a distal end of a curved portion 2 formed at the distal end of the flexible tube so as to be bendable by remote operation. A tip cap 3 made of an electrically insulating plastic material is joined to the surface.

The distal end surface of the distal end body 1 is formed on a slope 5 inclined at an angle of 45 °, for example, obliquely upward. An observation window 6 and an illuminating window 7 are adjacently arranged side by side in the lower half of the slope 5, and are nozzles for selectively ejecting air and water toward the surface of the observation window 6. 8 is arranged above the observation window 6. 9 is an air / water supply tube.

An objective optical system 12 including a prism 11 is arranged inside the observation window 6, and an image of a subject obliquely upward by 45 ° in the direction perpendicular to the slope 5 is built in the tip end body 1. An image is formed on the imaging surface of the solid-state imaging device 13 by the objective optical system 12, converted into an electronic signal by the solid-state imaging device 13, and transmitted to the outside of the insertion unit. Note that the solid-state imaging device 1
Instead of 3, an optical endoscope using an image guide fiber may be used.

An emission end portion of the illumination light guide fiber bundle 14 is disposed inside the illumination window 7. Is irradiated.

In a groove 15 formed above the illumination window 7, a treatment tool raising table 17 for changing the projecting direction of the distal end portion of the treatment tool inserted into the treatment tool insertion channel 16.
Are housed so as to rotate about the support shaft 18 by remote control.

The entire distal end surface of the distal end cap 3 is formed flush with the inclined surface 5 of the distal end body 1. However, a portion of the distal end surface of the distal end cap 3 which is located on the opposite side to the observation window 6 when viewed from the illumination window 7 is, for example, 1 mm away from the surface of the slope 5.
A projection 20 protruding by about 2 mm is formed.

Therefore, even when the mucosal surface is very close to the slope 5 in the body cavity, the mucosal surface abuts the projection 20 at a position opposite to the observation window 6 when viewed from the illumination window 7 and further increases the slope 5. , The illumination window 7 does not appear at a position that causes halation, and a good endoscope observation image can be obtained.

Therefore, it is desirable that at least the surface of the projection 20 on the side facing the illumination window 7 be subjected to some anti-reflection treatment such as matte black treatment or satin finish.

On the other hand, if the height of the projection 20 with respect to the surface of the slope 5 is too low, the effect of preventing halation will not be obtained. Conversely, if the height is too high, it will hinder the insertion of the endoscope. The height of 20 is desirably in the range of about 0.5 to 3 mm.

It is necessary to provide the projection 20 at a portion opposite to the observation window 6 when viewed from the illumination window 7, but as shown in FIG. It may be extended to be provided. However, it is not preferable to provide the vicinity of the observation window 6 because it is difficult to remove water droplets on the surface of the observation window 6 and deteriorate observation image quality.

[0021]

According to the present invention, a projection protruding forward from the surface of the slope near the illumination window provided on the slope of the tip end body and opposite to the observation window as viewed from the illumination window. Since the mucous membrane surface abuts the protrusion at that position and cannot approach the slope any further, the reflected image of the illumination window cannot be formed at the position that causes halation,
A good observation image without halation can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view taken along line II of a distal end portion of a perspective endoscope according to a first embodiment of the present invention.

FIG. 2 is a side sectional view taken along line II-II of a distal end portion of the perspective endoscope according to the first embodiment of the present invention.

FIG. 3 is a plan view of a distal end portion of the perspective endoscope according to the first embodiment of the present invention.

FIG. 4 is a side sectional view of a distal end portion of a perspective endoscope according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram showing a use state of a conventional oblique endoscope.

FIG. 6 is a schematic diagram showing an observation screen of a conventional oblique endoscope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tip main body 3 Tip cap 5 Slope 6 Observation window 7 Illumination window 20 Projection

Claims (5)

[Claims] 1. A distal end surface of a distal end body provided at a distal end of an insertion portion is formed obliquely to an axial direction of the distal end body, and an observation window and an illumination window are arranged side by side on the inclined surface. A perspective endoscope, wherein a projection protruding forward from the surface of the slope is provided in a portion near the illumination window and opposite to the observation window when viewed from the illumination window. The tip of a type endoscope. 2. A tip cap made of an electrically insulating material surrounding an outer periphery of the tip body is provided, and the projection is formed by locally projecting the tip cap from the surface of the slope. 2. A distal end portion of the perspective endoscope according to 1. 3. The method according to claim 1, wherein the protrusion is 0.5 to 0.5 mm from the surface of the slope.
The distal end portion of a perspective endoscope according to claim 1 or 2, wherein the distal end portion protrudes by 3 mm. 4. The projection according to claim 1, wherein the projection is 1 to 2 m from the surface of the slope.
The distal end portion of the perspective endoscope according to claim 3, wherein the distal end portion protrudes by a height of m. 5. An anti-reflection treatment is applied to at least a surface of the projection facing the illumination window.
A distal end portion of the perspective endoscope according to 3 or 4.