JPH074801Y2 - End of endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement in the structure of the distal end portion of an endoscope.

[Prior Art] Generally, at the distal end of an endoscope, in order to obtain a good observation field of view, it is necessary to eject fluid such as air and water toward the surface of the observation window. Therefore, in the distal end portion of the endoscope, the observation window and the illumination window are arranged on the surface of the distal end body so that they are flush with each other, and the nozzle for ejecting the fluid is directed toward the surface of the observation window. It was protruding.

[Problems to be solved by the invention] However, when the nozzle is provided so as to project from the tip end main body, the illumination light emitted from the illumination window is partially blocked by the nozzle, which not only reduces the illumination light amount but also the observation field of view. In some cases, the shadow of the nozzle was generated inside, and the observation performance was significantly impaired. Also,
When the nozzle is made of metal, there is a drawback that the illumination light impinging on the nozzle is reflected in the observation window and causes flare and ghost.

An object of the present invention is to solve the above-mentioned conventional drawbacks and provide a distal end portion of an endoscope in which a nozzle does not block illumination light.

[Means for Solving the Problems] In order to achieve the above object, the distal end portion of the endoscope of the present invention has an observation window and an illumination window arranged side by side on the distal end body, and At the tip of the endoscope in which the nozzle for ejecting the fluid toward the surface and the suction port for sucking the fluid are provided in the tip body, the concave portion recessed with respect to the surface of the illumination window is The tip body is formed so as to communicate with the opening, and the surface of the observation window is arranged at the bottom of the recess, and the nozzle is provided in the recess so that the nozzle does not protrude from the surface of the illumination window. The side wall of the recess is formed along the ejection direction of the nozzle so that the recess reaches the edge of the tip body in front of the nozzle.

[Operation] Since the nozzle does not protrude from the surface of the illumination window, the illumination light emitted from the illumination window is not blocked by the nozzle.

On the other hand, when a fluid is ejected from the nozzle toward the surface of the observation window, the ejected fluid is guided by the side wall of the recessed portion, hits the surface of the observation window without waste, and flows out from the edge of the tip body to the outside. The surface of the observation window is cleaned. Further, since the concave portion communicates with the opening of the suction port, the water droplets and the like remaining in the concave portion are easily sucked into the suction port.

[Example] An example will be described with reference to the drawings.

FIG. 1 is a front view of the distal end portion of the endoscope, and FIG. 2 is a side view thereof, and the endoscope of this embodiment is a so-called front view type.

In the figure, 1 is an illumination window in which a plane-parallel glass or a concave lens is fitted, and its surface 1a is the surface of the tip body 2.
It is formed almost on the same plane as 2a. To be precise, it slightly protrudes from the surface 2a of the tip body. Inside the illumination window 1, an emission end portion of an illumination light guide fiber (not shown) is arranged.

The tip body 2 is provided with a recess 3 recessed from the surface 1a of the illumination window. The bottom surface 3a of the recess 3 is a smooth flat surface parallel to the surface 2a of the tip body, and the observation window 4 is arranged on the bottom surface 3a. A parallel plane glass or lens is fitted in the observation window 4, and its surface 4a is formed substantially flush with the bottom surface 3a of the recess. To be precise, it slightly protrudes from the bottom surface 3a of the recess. Inside the observation window 4,
An objective lens (not shown) is arranged, and the incident end surface of the image guide fiber or the image receiving surface of the solid-state image sensor is arranged at the image forming position.

A nozzle 5 that selectively ejects air or water toward the surface 4a of the observation window 4 by remote control is provided in the recess 3. Reference numeral 5a denotes the jet port, which faces the surface 4a of the observation window 4. In this embodiment, the top 5b of the nozzle is arranged flush with the surface 2a of the tip body so as not to protrude from the surface 1a of the illumination window.

The side wall 3b of the concave portion 3 surrounds the periphery of the nozzle 5 by half,
It extends in a taper shape along the direction connecting the nozzle 5 and the observation window 4 (that is, the ejection direction of the nozzle 5) and reaches the edge portion 2b of the tip body 2. Further, the side wall 3b of the recess is located on the side of the opening of the suction port 6 on the way so that the recess 3 communicates with the opening of the suction port 6 that opens on the surface of the tip end main body 2 and sucks water, air, and the like. It is bent and formed.

In the tip portion of the endoscope of this embodiment formed in this way, the nozzle 5 does not protrude from the surface 1a of the illumination window,
Nothing is present in front of the surface 1a of the lighting window.
Therefore, the illumination light emitted from the illumination window 1 is not blocked by anything.

When water or air is jetted from the nozzle outlet 5a toward the surface 4a of the observation window 4, the jetted water or air is guided by the side wall 3b of the recess and hits the observation window surface 4a without waste. Therefore, the surface 4a of the observation window can be efficiently washed. Then, the fluid that has washed the surface 4a of the observation window passes through the inside of the concave portion 3 and flows out from the edge portion 2b of the tip portion main body. Further, water droplets and the like remaining in the recess 3 can be sucked and removed from the suction port 6.

In addition, in the above-described embodiment, the present invention is applied to the front end portion of the front-viewing type endoscope, but the present invention is not limited to this, and is a side-viewing type or a perspective type. It may be applied to the tip of any type of endoscope. Further, the nozzle is shown as one that selectively ejects air or water from one nozzle, but a plurality of nozzles may be provided, and what kind of fluid is ejected instead of air and water. May be

[Advantages of the Invention] According to the tip of the endoscope of the present invention, since the illumination light emitted from the illumination window is not blocked by the nozzle, good observation is performed with good illumination without reduction of the illumination light amount and shadows. Even if the nozzle is made of metal, flare and ghost do not occur.

Furthermore, since the fluid ejected from the nozzle flows along the side wall of the recess and hits the surface of the observation window without waste, the surface of the observation window can be efficiently cleaned. Moreover, the fluid that has washed the surface of the observation window flows through the inside of the recess, flows out outward from the edge of the tip body, and water droplets and the like remaining in the recess can be removed by suction. It is easy to keep the surface clean, and a clear observation image can always be obtained.

Further, since the nozzle does not project from the tip end main body, there is no possibility of damaging the mucous membrane surface of the patient, and there is an excellent effect that the tip hood that causes water to be stuck on the observation window surface is not necessary.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a side view thereof. 1 ... Illumination window, 2 ... Tip body, 2b ... Edge of tip body, 3 ... Recess, 3b ... Side wall of recess, 4 ... Observation window,
5 ... Nozzle, 6 ... Suction port.

Claims (1)

[Scope of utility model registration request] 1. An observation window and an illumination window are arranged side by side on the tip body, and a nozzle for ejecting fluid toward the surface of the observation window and a suction port for sucking the fluid are provided on the tip body. In the distal end of the endoscope, a concave portion that is recessed with respect to the surface of the illumination window is formed in the distal end body, and the surface of the observation window is arranged at the bottom of the concave portion, and the nozzle is provided at the top of the endoscope. Is placed in the recess toward the observation window so that it does not protrude from the surface of the illumination window,
The side wall of the recess is formed along the jet direction of the nozzle so that the recess reaches the edge of the tip body in front of the nozzle, and a part of the side wall of the recess is formed between the nozzle and the tip body. A distal end portion of an endoscope, characterized in that the concave portion is communicated with the opening portion of the suction port by being bent toward the opening portion side of the suction port halfway with the portion.