JPH0138572Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an endoscope illumination device whose illumination range can be changed.

In an illumination device for an endoscope for observing the inside of a body cavity, a part of the tip of a light-transmitting optical fiber bundle 1 is connected to an observation window 2 so as to illuminate a wide area as shown in FIG.
In addition to the main light section 1a, which has a relatively large number of optical fiber bundles for light transmission and is designed to emit strong light, there is a relatively small number of optical fiber bundles for light transmission that are weak. A lighting device has been considered in which a sufficient amount of light and a wide illumination range are obtained by forming an auxiliary light section 1b that emits light obliquely.

According to the optical fiber bundle for light transmission configured in this manner, when there is a distance from the object to be observed, the light spreads over the entire field of view provided by the image guide 3, as shown in FIG. 1R.

If the distance to the observation target is short, the first
As shown in Figure N, the observation range of the observation window 2 is
b can be used for illumination, and in this case too, the light is sufficiently spread. However, in this case, the light from the main light section 1b, which emits strong light, illuminates areas other than the observation range, and the light enters the tissue through the relatively transparent superficial mucosa A, as shown in Figure 2, and the light enters the tissue, causing blood vessels and red blood cells. and other tissues B, the red and strong reflected light illuminates the superficial mucosa A of the observation point from the inside, and as a result, the shadow of the observation target on the superficial mucosa disappears and the surface color changes. As a result, the three-dimensional effect of the fine morphology of the superficial mucosal surface, which is the object of observation, is lost and it becomes indistinct, making it difficult to observe well and also having the disadvantage that a clear image cannot be obtained when photographed. have.

The purpose of this invention is to solve the above-mentioned drawbacks.In the case of close-distance observation, a shutter is installed to cover all or part of the main light area, eliminating illumination other than the object to be observed. It is characterized by eliminating reflected light from the inside.

An embodiment of the present invention will be described below with reference to the drawings.

3 and 4 are side sectional views showing one embodiment of the present invention, and 4 is a bundle of optical fibers for transmitting light, the tip of which faces the illumination window 5, and the rear end of which faces the light source 6. do. Reference numeral 7 denotes an image guide, the tip of which faces an observation window 9 via an objective lens 8, and the rear end of which faces an eyepiece 10. A part of the tip of the light transmitting optical fiber bundle 4 is inclined toward the observation window 9 side, and the bundled state gradually becomes smaller in quantity as shown in FIG. 5, and is relatively large. An auxiliary light section 4b is formed corresponding to the main light section 4a, which has increased in number.

11 is a shutter, one end of which is connected to an operating wire 12, and this operating wire 12 is guided to an operating device 15 provided on a handle portion 14 of an endoscope 13. Reference numeral 16 denotes a guide which allows the shutter 11 to move parallel to the end surface of the bundle of optical fibers for transmitting light.
When the shutter 11 is pulled, the shutter 11 moves to cover all or part of the main light section 4a.

Although the endoscope 13 generally includes an angle wire, an air pipe, a water pipe, a forceps introduction pipe, etc., illustrations and explanations thereof will be omitted since the present invention is not related to these.

To explain the operation of the present invention with the above configuration,
When observing and photographing the superficial mucous membrane by inserting the endoscope 13 into a body cavity, when observing a wide area, the light from the main light section 4a and the auxiliary light section 4b of the light transmission optical fiber bundle 4 is observed. By irradiating the area, the entire visual field of the image guide 7 can be illuminated and sufficient illumination can be obtained.

Next, when the endoscope tip is brought close to the inner wall surface of the body cavity for local observation, the operating device 15 is operated to move the operating wire 12 in the direction of the arrow X as shown in FIG. Observation and photography can be performed using light from the auxiliary light section 4b covering the main light section 4a of the optical fiber bundle 4 for light. At this time, the amount of covering the principal light section 4a may be determined each time while observing through the eyepiece lens 10 so as to obtain the desired brightness, and by illuminating the observation area in this way, observation and photography can be performed. This provides sufficient light for the purpose.

Although not shown, the other end of the shutter may be pulled by a spring to always bias it in the direction of opening the main light section.

FIG. 6 shows another embodiment, in which the above-mentioned embodiment was implemented in a side-viewing endoscope, but this embodiment is used in a direct-viewing endoscope, and the shutter 17 is off-centered. Fix the tip of the operating wire 18 to the location,
By rotating the operating wire 18, the shutter 17 is rotated to cover the main light section 4a of the light-transmitting optical fiber bundle 4 by a desired amount, thereby limiting the illumination range. 19 is a rotating support body for the operating wire 18.

In each of the above embodiments, if the focus adjusting device 20 of the objective lens 8 and the operating device 15 of the operating wire 12 are linked as shown in FIG. 7, the tip of the endoscope 13 can be brought closer to the inner wall surface of the body cavity. When performing local observation etc., the main light section 4a is automatically covered, eliminating unnecessary light and making it possible to obtain a light amount suitable for close observation.

According to the present invention having the above-described configuration and operation, the tip of the optical fiber bundle for light transmission has a main light section that emits strong light for distant views, and an auxiliary light section that emits weak light that is successively formed therein. By making it possible to cover the main light part by the desired amount with the shutter as needed, when observing a wide area from a distance, you can open the shutter and see a sufficiently bright wide area. When performing local observation at a short distance, the main light part of the strong light is covered in whole or in large part, so the strong light passes through the superficial mucosa and is reflected on blood vessels and red blood cells in the tissue. This eliminates the need to illuminate the observation area from the inside, and as a result, the shadows of abnormal areas of the superficial mucosa do not disappear or the surface color becomes unclear, and the three-dimensional effect of the observation target is maintained. At the same time, the colors are sufficiently displayed, making it possible to perform accurate observation and photography.

[Brief explanation of drawings]

Figures 1 and 2 are enlarged cross-sectional views of the main parts of a conventional example. Figure 1 is a cross-sectional view showing the illumination range due to differences in observation distance, and Figure 2 is a cross-sectional view of a state where the observation distance is small and a local area is observed. 3 is a sectional view showing an embodiment of the present invention, FIG. 4 is an enlarged sectional view of the main part when observing a local area, and FIG. 5 is an example of the state of the tip of the optical fiber bundle for light transmission. FIG. 6 is an enlarged sectional view of a main part showing another embodiment of the present invention, and FIG. 7 is a sectional view showing an embodiment in which an operating device and a focus adjustment device are linked. 4... Optical fiber bundle for light transmission, 4a... Principal light section, 4
b...Auxiliary light section, 8...Objective lens, 11, 17
...Shutter, 12,18...Operation wire,
15... Operating device, 20... Focus adjustment device.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A main light section directed toward a distant view and an auxiliary light section directed toward a near view are connected to the front end of a bundle of optical fibers for transmitting light, the front end facing the illumination window and the rear end facing the light source. A shutter that covers all or part of the main light section is installed in front of the main light section so that it can appear and retract, and an operating wire whose tip is attached to the shutter An illumination device for an endoscope, the rear end of which is connected to an operating device on the handle of the endoscope. 2. The illuminating device for an endoscope according to claim 1, characterized in that a shutter operating device is linked to a lens focusing device.