JPH1142201A - Front end of small diameter forward observation endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front end for a small diameter forward observation endoscope in which a storing hole for an observation optical system and a storing hole for an illumination optical system are accurately formed in an apex part main body and adhesion of the observation optical system and the illumination optical system to the apex part main body can be performed by high reliability. SOLUTION: A storing hole 55 for an observation optical system is formed by a hole with a circular cross-sectional shape being parallel in the axial line direction of an apex part main body 47 and a storing hole 56 for an illumination optical system is formed by a curved long hole whose inside edge is along the outside of the edge part of the storing hole 55 for the observation optical system and outside edge is along the inside of the outer epriphery of the apex part main body 47 and a part in a range of a quarter to a half of the total length from the back end of the apex part main body 47 is formed into a cylindrical shape wherein the storing hole 55 for the observation optical system and the storing hole 56 for the illumination optical system are opened inside and an adhesive 59 is filled in the space in this cylindrical part 47a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forward-looking small-diameter endoscope.

[0002]

2. Description of the Related Art A distal end body connected to the distal end of an insertion portion of a forward-looking endoscope has an observation optical system housing hole for housing an observation optical system and an illumination optical system for housing an illumination optical system. A system accommodation hole is formed over the entire length in a direction parallel to the axis.

[0003]

However, in the case of an endoscope having a very small diameter, both the observation optical system accommodating hole and the illumination optical system accommodating hole are very small holes. The hole may be bent or deformed on the way, making it difficult to process. In addition, the adhesion between the observation optical system or the illumination optical system and the inner peripheral surface of the hole tends to be incomplete, and the reliability of the fixation and the seal by the adhesion is low.

Accordingly, the present invention enables the observation optical system housing hole and the illumination optical system housing hole to be accurately formed in the distal end body, and provides a highly reliable bonding of the observation optical system and the illumination optical system to the distal end body. It is an object of the present invention to provide a distal end portion of a forward-looking small-diameter endoscope that can be performed by using the above method.

[0005]

In order to achieve the above object, the distal end of the forward-looking small-diameter endoscope according to the present invention is provided with a cylindrical distal end body connected to the distal end of the insertion section. At the distal end of the forward-looking small-diameter endoscope in which the optical system housing hole and the illumination optical system housing hole are formed, the observation optical system housing hole has a circular cross-sectional shape parallel to the axial direction of the body of the front end. The illumination optical system accommodating hole is formed by a curved elongated hole whose inner edge extends along the outside of the edge of the observation optical system accommodating hole, and whose outer edge extends along the inner periphery of the distal end body. A quarter to one-half range of the total length from the rear end of the tip main body is formed in a tubular shape in which the observation optical system housing hole and the illumination optical system housing hole are opened. It is characterized in that a space inside the cylindrical portion is filled with an adhesive.

[0006] An image guide fiber as an observation optical system and a light guide fiber as an illumination optical system may pass through the cylindrical portion. It may be formed in one third of the range. Further, only the observation optical system and the illumination optical system may be incorporated into the insertion portion.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 4 shows a child scope 40 which is used by being inserted into and removed from the treatment tool insertion channel of the parent scope, and a base end of an insertion section 42 is connected to a lower end of an operation section 41. The diameter of the insertion portion 42 is, for example, about 2 mm,
The length (effective length) is formed to be longer than the entire length of the outer sheath 20 described later. 43 is an eyepiece, and 44 is a light guide connector connected to a light source device (not shown).

FIG. 1 shows the distal end of the insertion section 42 of the child scope 40. The insertion section 42 is covered with a flexible tube 46 over the entire length, and a distal end main body 47 is connected to a distal end thereof.

In this child scope, as shown in FIG. 2, an observation window 48 and an illumination window 51 are disposed on the distal end surface of the distal end main body 47, and the front of the distal end main body 47 is observed. This is a forward-looking endoscope, and an incident end face of an image guide fiber 50 is arranged at a position where an object is imaged by an objective optical system 49 arranged inside an observation window 48.

An emission end of a light guide fiber 52 made of plastic is disposed inside the illumination window 51.
A glass bead 53 for improving the light distribution of the illumination light emitted from the light guide fiber 52 and protecting the end face of the fiber is disposed on the front surface.

The child scope 40 of the present invention does not require the use of a guide wire for insertion into a bile duct or the like.
As shown in FIG. 3 showing a section taken along the line III, no channel or the like for passing a guide wire is provided inside the flexible tube 46, and the image guide fiber 5
Only 0 and the light guide fiber 52 are passed.

Returning to FIG. 1, the distal end body 47 is made of a columnar metal (for example, stainless steel), and the rear half of the distal end body 47 has an outer diameter dimension corresponding to the covering and bonding of the distal end portion of the flexible tube 46. It is formed thin.

As shown in FIG. 3, the cylindrical portion 47 having a thin cylindrical shape and having a thin cross-sectional shape is surrounded by an outer peripheral portion, as shown in FIG.
a.

An observation optical system accommodation hole 55 for accommodating an observation optical system constituted by the objective optical system 49 and the image guide fiber 50 is provided in a portion of the tip end main body 47 on the front side of the cylindrical portion 47a. An illumination optical system accommodation hole 56 for accommodating an illumination optical system constituted by the beads 53 and the light guide fibers 52 is formed in a direction parallel to the axis of the distal end main body 47.

The rear end of the observation optical system housing hole 55 has a cylindrical portion 4.
The cross-sectional shape of the opening 7a is a circular hole, the objective optical system 49 is built in the front half, and the incident end of the image guide fiber 50 is inserted and fixed in the rear half. . The observation optical system housing hole 55 is located eccentrically with respect to the center axis of the distal end main body 47, and its outermost edge is located at a position in contact with the inner peripheral surface of the cylindrical portion 47a.

The illumination optical system accommodating hole 56 has an inner edge extending along the outer edge of the observation optical system accommodating hole 55 and an outer edge having a cylindrical portion 47.
a light guide fiber 52 is inserted and fixed at the distal end thereof, a bead 53 is built in at the distal end, and the rear end is a cylindrical portion. 47a.

Therefore, the image guide fiber 50 and the light guide fiber 52 are passed through the cylindrical portion 47a, and the adhesive 59 is filled in the space of the cylindrical portion 47a. As a result, the image guide fiber 50 and the light guide fiber 52 in the cylindrical portion 47a.
Is securely adhered to the tip main body 47.

The distal end body 47 at the distal end of the forward-looking small-diameter endoscope having such a configuration is formed with observation optical system accommodation holes 55 and illumination optical system accommodation holes 56, which are minute holes. Since the portion is as short as approximately two-thirds of the total length from the front side, bending and deformation of the hole in the middle are extremely small, and the hole can be machined accurately.

Further, since the image guide fiber 50 and the light guide fiber 52 are bonded to the distal end main body 47 in the cylindrical portion 47a having a space for securely filling the adhesive 59, the solidity and the reliability are improved. High fixing and sealing are performed.

FIG. 5 shows a state in which the tip of the contrast medium injection tube 30 is inserted into the bile duct 100 through the parent scope 10 and a contrast medium is injected into the bile duct 100 as a pre-stage of using the child scope 40. ing.

The parent scope 10 is a so-called duodenal fiber scope of a side view type, in which a flexible tubular insertion portion 12 is connected to an operation portion 11, and a bending portion 13 which is bendable by remote operation from the operation portion 11. Is connected to the distal end of the insertion section 12, and a distal end body 14 having an objective optical system and the like built therein is connected to the distal end of the bending section 13.

A treatment tool insertion channel for inserting treatment tools is disposed through the inside of the insertion portion 12 and the curved portion 13, and the treatment tool insertion port 15 is provided at a lower portion of the operation portion 11. The treatment tool outlet 16 is formed on the side surface of the distal end body 14 with an opening.

The contrast medium injection tube 30 is not directly passed through the treatment instrument insertion channel, but the flexible tube 31 of the contrast medium injection tube 30 is connected to the outer sheath 20.
Is passed through, and the base 32 provided at the base end of the contrast agent injection tube 30 is connected to the base 22 provided at the base end of the outer sheath 20, and the contrast agent injection tube 30 and the outer sheath 20 are connected to each other. Are used in an integrated state.

The effective length of the mantle sheath 20 (that is, the length of the flexible tube 21) is formed to be longer than the entire length of the treatment instrument insertion channel, and the flexible tube 21 is inserted through the treatment instrument insertion port 15 to insert the treatment instrument. When the flexible tube 21 is fully inserted into the channel, the distal end portion 21a of the flexible tube 21 is formed to have a length protruding from the treatment instrument outlet 16 by, for example, about 5 to 10 cm.

However, in a state where the sheath 20 is used in combination with the contrast medium injection tube 30, the distal end portion of the flexible tube 31 of the contrast medium injection tube 30 projects from the treatment instrument outlet 16 into the bile duct 100. When in the inserted position, the flexible tube 21 of the outer sheath 20 and the contrast medium injection tube are so positioned that the distal end portion 21 a of the flexible tube 21 of the outer sheath 20 is located immediately before the root of the curved portion 13. The length difference between the flexible tube 31 and the flexible tube 31 is set.

In this state, the contrast medium injection tube 30
The tip of the flexible tube 31 is inserted into the bile duct 100, and a contrast agent is injected from an injection mouth 33 protruding from a base mouth 32 of the contrast agent injection tube 30.
The contrast agent can be sent out into the bile duct 100 to obtain an X-ray contrast image of the bile duct 100.

After the injection of the contrast agent into the bile duct 100,
As shown in FIG. 6, the base 22 of the mantle sheath 20
The coupling between the contrast agent injection tube 30 and the base 32 is released, and only the outer sheath 20 is pushed into the treatment instrument insertion port 15 without moving the contrast agent injection tube 30.

Then, the distal end portion 21a of the flexible tube 21 of the mantle sheath 20 protrudes from the treatment instrument outlet 16, and
The flexible tube 31 is inserted into the bile duct 100 using the flexible tube 31 as a guide.

In this state, the contrast medium injection tube 30 is removed without moving the mantle sheath 20, and
As shown in FIG. 7, by inserting the insertion portion 42 of the child scope 40 into the mantle sheath 20, the distal end of the insertion portion 42 of the child scope 40 is inserted into the bile duct 100 by using the mantle sheath 20 as a guide. Bile duct 10 with scope 40
Inside 0 can be observed.

The present invention is not limited to the above embodiment. For example, the axial length of the cylindrical portion 47a is about one-half to one-fourth of the length of the distal end body 47. It only has to be in the range.

[0031]

According to the present invention, since the portion where the observation optical system housing hole and the illumination optical system housing hole are formed is considerably shorter than the entire length of the distal end body, the hole is bent or deformed in the middle. Can be processed very accurately. In addition, since the image guide fiber and the light guide fiber are bonded to the distal end body in a cylindrical portion having a space for securely filling the adhesive, a strong and reliable fixing and sealing can be performed. .

[Brief description of the drawings]

FIG. 1 is an enlarged side sectional view of a distal end portion of an insertion portion of a child scope according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of a distal end portion of an insertion portion of the child scope according to the embodiment of the present invention.

FIG. 3 shows an insertion part II of the child scope according to the embodiment of the present invention.
It is I-III sectional drawing.

FIG. 4 is a side view of the child scope according to the embodiment of the present invention.

FIG. 5 is a schematic side view showing a first step of a procedure for using the parent-child type endoscope apparatus according to the embodiment of the present invention.

FIG. 6 is a schematic side view showing a second step of a procedure for using the parent-child type endoscope apparatus according to the embodiment of the present invention.

FIG. 7 is a schematic side view showing a third step of a procedure for using the parent-child type endoscope apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 42 Insertion part 47 Tip main body 47a Cylindrical part 49 Objective optical system 50 Image guide fiber 52 Light guide fiber 53 Bead 55 Observation optical system accommodation hole 56 Illumination optical system accommodation hole 59 Adhesive

Claims (4)

[Claims] 1. A forward-looking small-diameter endoscope in which an observation optical system accommodation hole and an illumination optical system accommodation hole are formed in a columnar tip end main body connected to a tip end of an insertion portion, The observation optical system housing hole is formed by a hole having a circular cross section parallel to the axial direction of the distal end body, and the illumination optical system housing hole has an inner edge outside the edge of the observation optical system housing hole. The outer edge is formed by a curved elongate hole along the inside of the outer periphery of the distal end body, and a quarter to one half of the entire length from the rear end of the distal end body is accommodated in the observation optical system. A distal end portion of a forward-looking small-diameter endoscope, wherein a hole and the illumination optical system housing hole are formed in a cylindrical shape that opens inside, and a space in the cylindrical portion is filled with an adhesive. 2. The forward-looking small-diameter endoscope according to claim 1, wherein an image guide fiber as an observation optical system and a light guide fiber as an illumination optical system pass through the cylindrical portion. 3. The cylindrical portion is formed in a range of approximately one third of the entire length from a rear end of the tip portion main body.
A distal end portion of the forward-looking small-diameter endoscope described in the above. 4. The distal end portion of a forward-looking small-diameter endoscope according to claim 1, wherein only the observation optical system and the illumination optical system are inserted thereinto.