JPS5990544A - Endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to an endoscope using a solid-state image sensor.

Endoscopes generally allow direct observation of the subject through an image guide using an optical fiber bundle, but it is possible to obtain an image of the subject using a solid-state image sensor without using such an image guide. A similar endoscope has also been developed 4). However, in endoscopy, when the insertion site is often curved, such as in colon examinations, it is difficult to determine the position of the tip of the endoscope under X-ray fluoroscopy from the outside.
After confirming this, a diagnosis is being made by observing the internal mirror image.

However, in this case, when attempting to observe the endoscopic mirror image under X-ray fluoroscopy, the X-rays that have passed through the exterior of the endoscope illuminate the signal line connecting the solid-state image sensor and button solid-state image sensor to the display device. , In particular, since the signal line extends inside the tube that is the insertion part of the endoscope, the Xla irradiation range for the signal line is extremely wide, and its influence cannot be ignored.

This invention provides an endoscope incorporating a solid-state image sensor,
It is an object of the present invention to provide an endoscope that eliminates the adverse effects associated with X-ray irradiation of signal lines.

A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, 1 is an endoscope, 2 is an insertion portion of this endoscope 1, and 3 is a distal end portion.

In addition, 4 is a light guide using optical fiber etc.
This light guide 4 is connected to a light source device 6 via a connector 5.

7 is a light source lamp.

An X-ray shield 8 made of metal such as lead alloy is attached to the tip 3. The X-ray shield 8 has a mounting hole 9 through which the tip of the light guide 4 is inserted and fixed, and an imaging hole 10 parallel to the mounting hole 9.

An objective lens group 11 is attached to the front of the imaging hole 10. 12 is a spacer ring, and 13 is a mounting ring. A solid-state image sensor 14 is housed at the imaging position of the objective lens group 11. This solid-state image sensor 14 is fixed between an insulating plate 15 and an annular holding plate 16.

There are 17 output signal lines, and the outside of the signal line 17 is covered with a shield line 18.

The shield #318 is electrically connected to the X-ray shield 8.

Further, the output signal line F is connected to an image reproducing circuit 19 provided on the operating side of the insertion section 2. 20 is an image sensor control circuit, and 21 is a button on a cathode ray tube monitor.

In the endoscope configured as described above, illumination light from the light source lamp 7 travels through the light guide 4 and is led out from the output end of the distal end portion 3 to illuminate the subject AY inside the body cavity. The image of the object A is formed on the solid-state image sensor 14 via the objective lens group 11, and the image is sequentially scanned by the image sensor control circuit 20, converted into pixel signals, and transmitted via the output signal line 17. and is sent to the image reproduction circuit 19. And image reproduction circuit 1
In 9! The horizontal and vertical synchronizing signals for the CRT monitor 21 are generated according to the signals from the I & image element control side 1 circuit 2o, and the pixel signal is input to this monitor 21VC as a brightness signal for the CRT monitor 21, and sent to the subject. Play the statue.

Then, while looking at the image displayed on the monitor 21, the operator uses external X-rays from an X-ray imaging device (not shown) to confirm the position of the endoscope tip 3 during the endoscopy. Perform fluoroscopy.

At this time, X-rays are irradiated toward the endoscope, but since the solid-state image sensor 14 is surrounded by the X-ray shield 8, the X-rays are absorbed by this shield 8 by a certain degree and the solid-state image sensor 141C is not reached. Therefore, it is possible to prevent the solid-state imaging device 14 from malfunctioning due to the influence of X-rays. Further, due to the shielding effect of the shield wire 18 covering the output signal line 17, noise generated by X-ray irradiation can be removed, and a clear internal mirror image can always be obtained even under X-ray fluoroscopy.

Note that FIG. 3 shows @2 embodiment of this invention,
Since the basic configuration is the same as that of the first embodiment, the common parts will be given the same reference numerals and the explanation will be omitted. ? An X-ray shielding case 22 made of metal owned by the government is accommodated, and a solid-state image sensor 147 is housed inside this shielding booth 22 via an insulating plate 15. An X1viI shielding plate 23 is attached to the front side of the image sensor 14 via an annular holding plate 16 (5).
There is. Therefore, according to the pressure of this embodiment, even when the dose of X-rays per irradiation is large and the shielding body 8 alone cannot shield the X-rays, the shielding case 22 and the shielding plate 23 can double-shield the X-rays. Therefore, 1) X-rays can be reliably blocked due to the shielding effect.

As explained above, the endoscope of the present invention covers the signal line connecting the solid-state image pickup device and the display device 11.w with an illuminating shield wire, which eliminates 16 sounds caused by X-ray irradiation. As a result, clear images can be obtained even if X11il is not used for diagnosis.

[Brief explanation of drawings]

Fig. 8131 is a schematic diagram of an endoscope showing the first practical example of this invention, Fig. 2 is an enlarged sectional view of the distal end of the same internal congratulatory code, and Fig. 3 is an endoscope showing the second embodiment of this invention. FIG. 3 is a sectional view of the tip of the mirror. DESCRIPTION OF SYMBOLS 1... Endoscope, 2... Insertion part, 8... X-ray donor body, 14... Solid-state image sensor, 17... Exit Cairo line,
18... Shield wire, A... Subject. patent applicant

Claims (1)

[Claims] In an endoscope that is equipped with a solid-state imaging device at the tip of the insertion section and displays an image of a subject obtained by the solid-state imaging device via an output signal line, the outside of the output signal line is connected with a shield wire. An endoscope characterized by being covered.