JP2002112951A - Distal end of insertion tube of endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distal end of the insertion tube of an endoscope which achieves the collection of a tissue sample quickly and accurately from a site too slender to insert the endoscope by easily guiding a hole for protruding an instrument to the aditus of a peripheral branchia, or the like, while watching an X-ray image. SOLUTION: At the distal end of the insertion tube of the endoscope, provided with at least an observation window 22 and a hole 23 for protruding the instrument on the body 21 thereof made up of an electrically insulating material, at least the portion surrounding the hole for protruding the instrument is made impervious to X rays or an X-ray impervious substance is added to the portion surrounding the hole for protruding the instrument.

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 an endoscope insertion portion.

[0002]

2. Description of the Related Art A distal end body forming the distal end of an insertion portion of an endoscope is generally formed of an electrically insulating plastic so that a high-frequency treatment instrument can be used safely.

[0003]

In order to collect a biopsy tissue sample from a lesion in the peripheral bronchus that is too thin to insert an endoscope, a treatment tool outlet of the endoscope inserted up to just before the peripheral bronchus is required. The tissue is collected from the target site by protruding the biopsy forceps.

[0004] However, when the other party is very thin like the peripheral bronchus, even if the observation window is guided in front of the entrance of the peripheral bronchus, the treatment tool ejection port does not face the peripheral bronchus. The treatment tool outlet must be guided to the front of the peripheral bronchus with reference to the image.

However, if the distal end body of the endoscope is formed of an electrically insulating plastic as described above, the guide port of the treatment instrument does not appear on the X-ray image. And uncertain factors such as the result of trial and error were large, and it took time to collect tissues.

Accordingly, the present invention provides a method for easily and reliably collecting a tissue specimen from a portion too small to insert an endoscope by easily guiding a treatment tool outlet to an entrance of a peripheral bronchus while observing an X-ray image. It is an object of the present invention to provide a distal end portion of an endoscope insertion portion capable of performing the above.

[0007]

In order to achieve the above object, the distal end portion of the endoscope insertion portion of the present invention is provided with at least an observation window and a treatment tool outlet through a distal end body formed of an electrically insulating material. At the distal end of the endoscope insertion section where
At least a portion surrounding the treatment tool outlet is an X-ray opaque structure.

[0008] An X-ray opaque substance may be added to at least a portion of the electrical insulating material constituting the distal end body surrounding the treatment instrument outlet, and at least a distal end portion of the treatment instrument insertion tube connected to the treatment instrument outlet is provided. An X-ray opaque substance may be added to the vicinity, or a tubular body made of an X-ray opaque material may be arranged around the distal end portion of the treatment instrument insertion tube connected to the treatment instrument outlet.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a distal end portion of an endoscope insertion portion according to a first embodiment of the present invention, in which hatching is applied only to a cross section of a member that is opaque to X-rays.

[0010] A bending portion 10 which is bent by remote control is provided at a distal end portion of a flexible insertion tube of the endoscope.
The bending portion 10 is formed by rotatably connecting a plurality of short-cylindrical node rings 11 made of a stainless steel tube with rivets 12, covering an outer periphery thereof with a braided tube 13 braided with a stainless steel wire, and further covering the outside thereof. It is constituted by covering an outer skin 14 made of a rubber tube. Reference numeral 15 denotes a bending operation wire pulled by remote control.

A distal end body 21 made of an electrically insulating plastic material is connected to the leading end of the node ring 11a via a connecting tube 19 made of stainless steel pipe. For example, an X-ray opaque substance such as barium sulfate or tungsten is added.

An observation window 22 is provided on the distal end surface of the distal end body 21.
The treatment tool protrusion 23 and an illumination window (not shown) are arranged, and the emission end of the illumination light guide fiber bundle is arranged inside the illumination window.

A metal lens frame 2 is provided inside the observation window 22.
The objective lens 25 is arranged in the inside of the camera 4, and the imaging surface of the solid-state imaging device 26 is arranged in the metal shield cylinder 27 arranged behind and adjacent to the object at the position where the objective lens 25 forms an image of the subject. I have.

The lens frame 24 and the shield cylinder 27 are disposed in a through hole formed in the distal end main body 21 in a direction parallel to the axis. Reference numeral 28 denotes an electronic circuit element including a drive circuit of the solid-state imaging element 26 and the like, and 29 denotes a signal cable.

Numeral 30 denotes a treatment instrument insertion channel (treatment instrument insertion tube) made of a tetrafluoroethylene resin tube which is inserted through the entire length of the insertion section. The exit opening of the treatment tool insertion channel 30 is located adjacent to the treatment tool protrusion port 23 by being inserted into and fixed to a hole formed in the parallel direction.

FIG. 2 shows an X-ray image when the distal end portion of the endoscope insertion portion of the above-described embodiment is placed under X-ray fluoroscopy. 24 and the shield tube 27 clearly appear, and the tip end body 21 appears slightly thinner around it.

Therefore, not only can the position of the observation window 22 be clearly understood, but also the position of the treatment tool outlet 23 can be accurately confirmed.
3 is easily guided to the front position such as the entrance of the peripheral bronchus,
Tissue samples can be quickly and reliably collected from a lesion or the like in the peripheral bronchus that is so thin that the distal end main body 21 cannot enter.

FIG. 3 shows a distal end portion of an endoscope insertion portion according to a second embodiment of the present invention. Instead of adding an X-ray opaque substance to the distal end portion main body 21, a treatment tool is inserted. The same X-ray opaque substance is added to the channel 30. Other parts are the same as those of the first embodiment.

As a result, when the distal end of the endoscope insertion portion of this embodiment is placed under X-ray fluoroscopy, as shown in FIG. 27 appears clearly, and the tip of the treatment tool insertion channel 30 appears slightly thin alongside it, and the position of the treatment tool outlet 23 can be accurately confirmed with an X-ray image.

When it is desired to check the hardness of the lesion at the position where the distal end of the endoscope insertion section reaches, the distal end surface of the distal end main body 21 is pressed accurately against the lesion. Can be sensed.

FIG. 5 shows a distal end portion of an endoscope insertion portion according to a third embodiment of the present invention, which is used for adding an X-ray opaque substance to the distal end body 21 and the treatment instrument insertion channel 30. Instead, an X-ray opaque cylinder 31 formed of, for example, a stainless steel tube or foil is disposed so as to be wound around the outer periphery near the distal end portion of the treatment instrument insertion channel 30. Other parts are the same as those of the first and second embodiments.

As a result, when the distal end of the endoscope insertion portion of this embodiment is placed under fluoroscopy, as shown in FIG. 6, the lens frame 24 and the shield The X-ray opaque cylinder 31 clearly appears alongside the cylinder 27, and the position of the treatment tool outlet 23 can be accurately confirmed with an X-ray image.

The present invention is not limited to the above embodiment. At least the portion surrounding the treatment tool outlet 23 has an X-ray opaque structure so that the position of the treatment tool outlet 23 can be changed to an X-ray image. The treatment tool outlet 23 can be easily guided to the front position such as the entrance of the peripheral bronchus while observing the X-ray image, and the tissue can be quickly and reliably removed from a lesion or the like in the peripheral bronchus. A sample can be collected.

[0024]

According to the distal end portion of the endoscope insertion portion of the present invention, at least a portion surrounding the treatment tool outlet is made to be X-ray opaque, so that the position of the treatment tool outlet can be represented by an X-ray image. It is possible to accurately confirm, and while viewing the X-ray image, easily guide the treatment tool outlet to the entrance of the peripheral bronchus, etc., and quickly and surely collect tissue specimens from a small part where the endoscope can not be inserted It can be performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a distal end portion of an endoscope insertion section according to a first embodiment of the present invention.

FIG. 2 is a side view of an X-ray image of a distal end portion of the endoscope insertion section according to the first embodiment of the present invention.

FIG. 3 is a side sectional view of a distal end portion of an endoscope insertion section according to a second embodiment of the present invention.

FIG. 4 is a side view of an X-ray image of a distal end portion of an endoscope insertion section according to a second embodiment of the present invention.

FIG. 5 is a side sectional view of a distal end portion of an endoscope insertion section according to a third embodiment of the present invention.

FIG. 6 is a side view of an X-ray image of a distal end portion of an endoscope insertion section according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bending part 19 Connecting cylinder 21 Front-end | tip main body 23 Treatment tool protrusion port 24 Lens frame 27 Shield cylinder 30 Treatment tool insertion channel 31 X-ray opaque cylinder

Claims (4)

[Claims] 1. A distal end body formed of an electrical insulating material, at least a distal end portion of an endoscope insertion section in which an observation window and a treatment instrument outlet are disposed, at least a portion surrounding the treatment instrument outlet is X. A distal end portion of the endoscope insertion portion, which has a line opaque structure. 2. The distal end portion of the endoscope insertion portion according to claim 1, wherein an X-ray opaque substance is added to at least a portion of the electrical insulating material constituting the distal end portion body surrounding the treatment tool outlet. 3. The distal end portion of the endoscope insertion portion according to claim 1, wherein an X-ray opaque substance is added at least near a distal end portion of the treatment instrument insertion tube connected to the treatment instrument outlet. 4. A distal end portion of an endoscope insertion portion according to claim 1, wherein a cylindrical body made of an X-ray opaque material is disposed around a distal end portion of the treatment instrument insertion tube connected to the treatment instrument outlet. .