JPH0876028A - Leading edge structure for side-view type electronic endoscope - Google Patents

Abstract

PURPOSE: To perform good observation in the case of medical treatment by arranging an irradiation window on a leading edge side from an observation window without making the diameter of an endoscope large. CONSTITUTION: As for the leading edge 21 of this side-view type electronic endoscope with the observation window 23 arranged on the side surface, a prism 25 is disposed between the optical member 24 of the window 23 and the CCD 26, so that incident light 100 from the window 23 is reflected in nearly the right angle direction so as to go toward the side surface, and a light guide 30 is disposed by utilizing a space S formed on the back surface side of the prism 25. The window 31 is attached to the light guide 30, so that the window 31 is arranged on the leading edge side from the window 23. Owing to the windows 31 and 23, the surface on the recessed and projection part inside a body to be observed facing in a direction where the endoscope is inserted can be easily viewed, and for example, the medical treatment on the papilla duodemi part can be performed well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement structure of a distal end portion of a side-viewing electronic endoscope in which an irradiation window, an observation window, a forceps port, etc. are arranged on the side surface side.

[0002]

5 and 6 show a tip portion of a conventional side-view electronic endoscope, in which an observation window 2 and an irradiation window 3 are arranged on the side surface of the tip portion 1. There is. A CCD (Charge Coupled Device) is attached to the observation window 2 via an optical system member 4.
5, a signal cable 7 is connected to the circuit board 6 of the CCD 5, and the signal cable 7 is provided up to, for example, an external processor device. On the other hand, a light guide 8 is attached to the irradiation window 3, and this light guide 8 is finally connected to the light source device. Further, as shown in FIG. 6, the wire 9 is provided at a position aligned with the observation window 2.
A stand 10 to which is connected is attached by a shaft 11, and a forceps port is provided on the rear side of the stand 10 in the figure. Therefore, by raising the upright table 10 with the wire 9, the treatment tool 12 can be led out from the side surface (forceps port) to a predetermined position or direction as shown in FIG.

According to the structure of the tip portion 1, the light supplied through the light guide 8 is radiated from the irradiation window 3 into the body to be observed, and the in-vivo image of the body to be observed is the observation window 2 and the optical system member 4.
It is captured by the CCD 5 via. The image signal obtained by the CCD 5 is input to an external processor device or the like via a signal cable 7 and is signal-processed there, so that an image inside the observed body is displayed on a monitor. At the same time, the treatment tool 12 can be led out from the side surface of the distal end portion 1 by the upright table 10, and various treatments can be performed by the treatment tool 12.

[0004]

By the way, in the conventional side-viewing type electronic endoscope, since the observation window 2 is disposed closer to the tip side than the irradiation window 3 as described above, it exists in the body to be observed. A surface that faces the insertion direction of the endoscope (slope, etc.)
There may be a shadow on or dark. For example, as shown in FIG. 7, in the case of the papilla of the duodenum, which is a typical endoscopic treatment site, the endoscope 14 is inserted from the stomach 15 into the duodenum 16 and into the bile duct 17 and the pancreatic duct 18. A predetermined treatment is performed on the teat 19 having the opening. However, the teat 19 is a convex portion as shown in the figure, and the light irradiation from the irradiation window 3 arranged at the rear causes the opening of the teat 19 to become a shadow, and the treatment with the treatment tool 12 is performed. There was a problem of difficulty.

The same applies to observation of a diverticulum or the like, and in many cases, it is convenient for an endoscope to arrange the irradiation window 3 on the distal end side of the observation window 2. However, for this purpose, the light guide 8 must also be arranged up to the distal end side, so that there is a problem that the diameter of the endoscope becomes large.
That is, as is apparent from FIG. 6, the optical system member 4, the CCD 5, the circuit board 6, the signal cable 7 and the like are connected and arranged in the observation window 2, and in the arrangement state as shown in FIG. Since there is no place to dispose, the diameter of the endoscope becomes large. In the endoscope, it is desired to make the diameter as thin as possible in order to reduce the pain of the patient.

The present invention has been made in view of the above problems, and an object of the present invention is to arrange an irradiation window closer to the distal end side than the observation window without increasing the diameter of the endoscope, and to observe during treatment. It is an object of the present invention to provide a tip end structure of a side-viewing type electronic endoscope that can perform excellent operation.

[0007]

In order to achieve the above object, the present invention provides an irradiation window and an observation window on the side surface, and a light guide is connected to the irradiation window, while an optical member is provided in the observation window. At the tip of the side-view electronic endoscope to which the solid-state image sensor is connected via, between the optical member and the solid-state image sensor, incident light from the observation window is reflected in a direction substantially at right angles to the side surface. A prism is arranged so as to face, the light guide is arranged by utilizing a space formed on the back side of the prism, and the irradiation window is arranged on the tip side of the observation window. .

[0008]

According to the above construction, the solid-state image pickup device and the circuit board, which are conventionally arranged at the position where the incident light from the observation window directly hits, move in the direction rotated by about 90 degrees by the prism. As a result, a space is formed on the back side of the prism. Therefore, by utilizing this prism back space, the light guide can be arranged between the prism back surface and the outer case body. Then, if the irradiation window is optically connected to this light guide, it is possible to arrange the irradiation window closer to the distal end side than the observation window without increasing the diameter of the endoscope.

[0009]

1 to 3, there is shown a tip end structure of a side-view electronic endoscope according to an embodiment, and the tip end portion 21 is arranged so as to be connected to an angle portion 22. An observation window 23 is provided on the side surface of the tip portion 21, and a prism 25 is connected to the observation window 23 via an optical system member 24. As shown in FIG. 2, the prism 25 is arranged so that the incident light 100 is reflected by 90 degrees and emitted in the side direction.
CCD 26 having a cover glass on the prism 25
And the circuit board 27 is attached. Therefore, in this case C
The CD 26 and the circuit board 27 are arranged at a right angle (a position rotated by 90 degrees) with respect to the side surface on which the observation window 23 and the like are arranged, and the image pickup surface of the CCD 26 is arranged parallel to the optical axis direction of the optical system member 24. It will be.

At this time, as shown in FIG. 2, a space S is formed on the back side of the prism 25. Therefore, in this embodiment, by utilizing this space S, the light guide (optical fiber bundle) 30 is arranged between the back surface of the prism 25 and the cap 29. Then, as shown in FIG. 1, the irradiation window 31 is provided on the tip side of the observation window 23, and the light guide 30 is connected to the irradiation window 31. With such an observation window 23 and the irradiation window 31 arranged on the tip side of the observation window 23, a surface (slope, etc.) facing the insertion direction of the endoscope can be satisfactorily observed in the uneven portion in the body cavity. You can do it. In the embodiment, a light blocking material is applied to the outer circumference of the light guide 30 (or a light blocking pipe is provided), and a light blocking material is also applied to the outer peripheral surfaces of the prism 25 and the CCD 26.
The influence of other light on the irradiation light is prevented.

Further, as shown in FIG.
On the side surface of the forceps port 33 that communicates with the treatment instrument insertion channel.
Is provided, and an upright stand 34 is attached to the tip end side of the forceps port 33. This upright stand 34 is pivotally supported by a shaft 35 (FIG. 2), and a wire 36 is attached to the upright stand 34. By pulling the wire 36, the upright stand 34 is raised, whereby the treatment tool 12 is placed on the side surface of the distal end portion 21. Can be derived in the vertical direction. In addition, as shown in FIG. 1, the tip portion 21 is covered with a cap 38,
A nozzle 40 connected to an air / water supply pipe is arranged near the observation window 23, and wires 41A and 41B for bending the angle portion 22 are provided on the rear side.

The embodiment has the above-mentioned constitution, and when this electronic endoscope is applied to the above-mentioned duodenal papilla, FIG.
As shown in. That is, from the stomach 15 to the duodenum 16
In the distal end portion 21 of the endoscope 14 inserted into the observation window 23
Since the irradiation light is output from the irradiation window 31 arranged on the distal side of the bile duct 17 and the pancreatic duct 18 on the back side of the papilla 21.
The exit opening of the can be illuminated well. Therefore, the treatment with the treatment tool 12 can be easily performed while observing the image of the teat 21 obtained through the observation window 23.

In the embodiment, the prism 25 is used to arrange the CCD 26 and the circuit board 27 on the side surface side which is parallel to the optical axis.
Since the light guide 30 is arranged using the space S on the back side of the light guide 30, the light guide 30 and the irradiation window 31 are arranged closer to the tip side than the observation window 23 without increasing the diameter of the tip portion 21. Can be installed.

[0014]

As described above, according to the present invention,
Between the optical member of the observation window and the solid-state image sensor, a prism is arranged so that the incident light from the observation window is reflected at a substantially right angle and goes to the side surface, and the space formed on the back side of this prism is formed. Since the light guide is arranged by utilizing the light guide, the irradiation window can be arranged closer to the distal end side than the observation window without increasing the diameter of the endoscope. Further, the irradiation of the irradiation window makes it easier to see the surface of the concavo-convex portion in the body to be observed, which faces the insertion direction of the endoscope, and for example, there is an advantage that the papilla of the duodenum can be favorably treated.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view showing a tip end structure of a side-view electronic endoscope according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view when the tip portion of FIG. 1 is sliced.

FIG. 3 is a partial cross-sectional perspective view showing the arrangement of the light guides at the tip of the embodiment.

FIG. 4 is a diagram showing a state in which the endoscope of the example is applied to the papilla of the duodenum.

FIG. 5 is a side cross-sectional view showing the structure of the tip portion of a conventional side-view electronic endoscope.

FIG. 6 is a cross-sectional view when the tip portion of FIG. 5 is sliced.

FIG. 7 is a diagram showing a state in which a conventional endoscope is applied to the papilla of the duodenum.

[Explanation of symbols]

 1, 21 ... Tip part, 2, 23 ... Observation window, 3, 31 ... Irradiation window, 4, 24 ... Optical system member, 5, 26 ... CCD, 6, 27 ... Circuit board, 8, 30 ... Light guide, 12 ... Treatment tool, 14 ... Endoscope, 25 ... Prism, S ... Space.

Claims (1)

[Claims] 1. A side-viewing type electronic endoscope in which an irradiation window and an observation window are arranged on a side surface, a light guide is connected to the irradiation window, and a solid-state image sensor is connected to the observation window via an optical member. At the tip of the prism, a prism is arranged between the optical member and the solid-state image sensor so that the incident light from the observation window is reflected in a direction substantially at a right angle and goes to the side surface. A distal end structure of a side-view electronic endoscope, wherein the light guide is disposed in the space defined above, and the irradiation window is disposed closer to the distal end side than the observation window.