JPH09276208A - Tip part of endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high electric safety by covering the circumferential surface of a tip body with an electric insulating cap, and covering the inner wall surface on the side which get closer to a treatment tool when it is raised, of the inner wall surface of a treatment tool protruding port. SOLUTION: A tip body 1 to be connected to the end of an insert part 2 is made into a form where one side surface in the part closer to the tip is flatly cut, and an observation window and a lighting window are arranged on this flat part. The end of a treatment tool inserting channel 6 is connected to the rear end of the tip body 1, and a treatment tool raising piece 7 operated by remote control is arranged within a treatment tool protruding port 8, and a tip cap 10 formed of an electric insulating member is put on the outer surface of the tip body 1. Further, of the inner wall surrounding the treatment tool protruding port 8, the surface part of the inner wall surface on the rear side, or the surface part of the wall surface on the side getting closer to a treatment tool 10 by raising the treatment tool 100 is covered with a part (inner wall covering part 15) of the tip cap 10.

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 in which a treatment instrument raising piece for raising a treatment instrument by remote control is arranged in a treatment instrument projection opening.

[0002]

2. Description of the Related Art FIG. 7 shows a distal end portion of a conventional side-view endoscope, and a treatment instrument 10 protruding from a distal end body 51.
In order to guide the tip of 0 to the vicinity of the center of the observation field of view, the treatment instrument raising piece 52 which is rotated about the axis 54 by remote control.
Are arranged in the treatment tool projecting port 53.

Further, the outer surface of the tip body 51 is covered with an electrically insulating cap 55 so that the patient is not burned by a leak current from the treatment instrument 100 using a high frequency current.

[0004]

As shown in FIG. 7, the treatment instrument 100 is projected along the treatment instrument raising piece 52, and the treatment instrument raising piece 52 is rotated as indicated by the alternate long and short dash line. As a result, the protruding portion of the treatment instrument 100 is raised.

However, in the case where the treatment tool 100 has a high-frequency electrode wire 101 exposed over a relatively long range, such as the high-frequency incision tool shown in FIG. 7, the high-frequency electrode wire 101 is used to perform the treatment. The main body 51 may be directly touched and a large current may flow into the metal tip body 51, causing a burn accident or the like.

Therefore, according to the present invention, even when a treatment tool in which the high-frequency electrode wire is exposed on the surface is used, the electrode wire does not touch the metal body of the tip part, and the tip part of the endoscope having high electrical safety is provided. The purpose is to provide.

[0007]

In order to achieve the above-mentioned object, the distal end portion of the endoscope of the present invention is provided with a treatment tool projecting port in a distal end portion main body provided at the distal end of the insertion section, and the treatment tool projecting means is provided. At the distal end of the endoscope in which a treatment instrument raising piece for remotely raising the treatment instrument projected from the mouth is disposed in the treatment instrument protrusion port, the outer peripheral surface of the tip body is electrically insulated. In addition to being covered with a cap, the inner wall surface of the inner wall surface of the treatment tool projecting opening, which is closer to the treatment tool when the treatment tool is raised, is covered with an electrically insulating member.

The electric insulating member may be formed integrally with the cap, or the electric insulating member may be formed separately from the cap and joined to the tip portion main body. May be.

The electrical insulating member may be formed so as to be continuous from a wall surface portion of the treatment tool projecting port on the side approaching when the treatment tool is raised to a side wall surface portion thereof. The electrically insulating member may be formed so as to cover only a part of a wall surface portion of the treatment instrument projecting port that is closer to the treatment instrument when the treatment instrument is raised.

[0010]

Embodiments of the present invention will be described with reference to the drawings. 1 and 2 are a side sectional view and a plan view of a distal end portion of an endoscope according to a first embodiment of the present invention.

A tip portion main body 1 connected to the tip of the insertion portion 2
Is made of a metal round bar made of, for example, stainless steel or the like, and is formed into a shape in which one side surface of the portion near the front side is cut flat. An observation window 4 and an illumination window 5 are arranged side by side on the plane portion 3.

As shown in FIG. 1, the distal end of the treatment instrument insertion channel 6 for inserting the treatment instrument 100 is connected to the rear end of the tip portion main body 1. Then, the treatment instrument 10 sent out through the treatment instrument insertion channel 6
To guide the tip of 0 near the center of the observation field,
A treatment instrument raising piece 7 that is operated by remote control is arranged in the treatment instrument protrusion opening 8.

The treatment tool projecting port 8 has an observation window 4 and an illumination window 5.
Along with and vertically (that is, long in the axial direction of the tip body 1)
An opening is formed, and the treatment instrument raising piece 7 is operated via an operation wire (not shown) that is operated to move forward and backward by a remote operation, and is rotated around a shaft 9 provided in the treatment instrument protrusion opening 8. Move.

The outer surface of the tip body 1 is made of a flexible electrically insulating material such as fluororubber so that the patient is not burned by a leak current from the treatment instrument 100 using a high frequency current. A tip cap 10 made of a flexible material is covered.

In this tip cap 10, a circumferential projection 12 projecting from the inner peripheral surface near the mouth of the opening is fitted into a circumferential groove 13 formed near the rear end of the tip body 1. As a result, it is fixed to the tip body 1.

When the tip cap 10 is pulled forward by applying force, the tip cap 10 is elastically deformed so that the circumferential projection 12 is disengaged from the circumferential groove 13, and the tip cap 10 is removed.
Can be removed from the tip body 1.

As shown in FIG. 1, the rear surface (the right side in the figure) of the inner wall surface surrounding the treatment tool projecting opening 8, that is, the surface portion of the inner wall surface, that is, the treatment tool 100 is approached when the treatment tool 100 is raised. The surface portion of the side wall surface is covered with a part of the tip cap 10 (inner wall surface covering portion 15). In FIG. 2, the inner wall surface covering portion 15 is shown by a broken line.

As shown in FIG. 1, the treatment tool 10 in which the high-frequency electrode wire 101 is exposed over a relatively long range.
When the distal end portion of 0 is raised by the treatment instrument raising piece 7 to a certain extent or more, the high frequency electrode wire 101 comes into contact with the inner wall surface of the treatment instrument projecting port 8.

However, since it is the inner wall surface covering portion 15 of the electrically insulating tip cap 10, the high frequency electrode wire 10
1 and the metallic tip body 1 do not come into contact with each other. Therefore, even if a high frequency current is passed through the high frequency electrode wire 101 in that state, the current is not transmitted to the tip portion main body 1.

FIG. 3 and FIG. 4 show a second embodiment of the present invention, in which the inner wall surface covering portion 15 is attached to the treatment instrument projecting port 8.
Not only the rear wall surface, but also the left and right side wall surfaces near the rear wall surface are continuously formed.

With this configuration, the treatment tool 1
Since the high-frequency electrode wire 101 of No. 00 does not touch the tip end main body 1 even if it is shaken in the left-right direction, electrical safety during high-frequency treatment is further enhanced.

FIG. 5 shows a third embodiment of the present invention, in which the inner wall surface covering portion 15 is formed of an electrically insulating member which is a separate component from the tip body 1, and the tip body 1 and the tip are formed. It is joined to the cap 10. With this configuration, the inner wall surface covering portion 15 and the tip cap 10 are provided.
Can be easily manufactured.

FIG. 6 shows a fourth embodiment of the present invention, in which the inner wall surface covering portion 15 of the third embodiment is removed. According to this structure, only a part of the rear wall portion of the treatment tool projecting port 8 is covered with the electric insulating material.

However, in the rear wall portion of the treatment instrument projecting port 8, the wall surface of the metallic tip body 1 is retracted rearward, and a part of the tip cap 10 is provided near the opening of the treatment instrument projecting port 8. Since 10a projects, the high-frequency electrode wire 101 of the treatment instrument 100 contacts the electrically insulating tip cap 10 and does not contact the tip body 1.

In each of the above-described embodiments, if a portion having a lubricity such as a fluororesin coating is applied to a portion that is touched when the treatment instrument 100 passes,
It is possible to smoothly move the treatment tool 100 back and forth even when the treatment tool 100 is raised.

[0026]

According to the present invention, at least the surface portion of the inner wall surface of the inner wall surface of the treatment tool projecting port formed on the metallic tip body is closer to the treatment tool when the treatment tool is raised. Even if you use a treatment tool where the high-frequency electrode wire is exposed on the surface because it is covered with an electrically insulating member, the electrode wire does not touch the tip body, and high-frequency current is not transmitted to the tip body, which may cause burn accidents. It is possible to obtain high electrical safety.

[Brief description of drawings]

FIG. 1 is a side sectional view of a first embodiment of the present invention.

FIG. 2 is a plan view of the first embodiment of the present invention.

FIG. 3 is a side sectional view of a second embodiment of the present invention.

FIG. 4 is a plan view of a second embodiment of the present invention.

FIG. 5 is a side sectional view of a third embodiment of the present invention.

FIG. 6 is a side sectional view of a fourth embodiment of the present invention.

FIG. 7 is a side sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tip part main body 7 Treatment tool raising piece 8 Treatment tool protruding port 10 Tip cap 15 Inner wall surface covering part 100 Treatment tool 101 High frequency electrode wire

Claims (5)

[Claims] 1. A distal end body provided at the distal end of an insertion portion is provided with a treatment instrument projecting port, and a treatment instrument raising piece for remotely raising a treatment instrument projecting from the treatment instrument projecting port is provided. At the distal end portion of the endoscope disposed in the treatment instrument projection opening, the outer peripheral surface of the distal end portion main body is covered with an electrically insulating cap, and the treatment instrument is raised from the inner wall surface of the treatment instrument projection opening. A distal end portion of an endoscope, characterized in that an inner wall surface on the side approaching when covered is covered with an electric insulating member. 2. The distal end portion of the endoscope according to claim 1, wherein the electrically insulating member is formed integrally with the cap. 3. The distal end portion of the endoscope according to claim 1, wherein the electrically insulating member is formed separately from the cap and is joined to the distal end portion main body. 4. The electrical insulating member is formed so as to be continuous from a wall surface portion of the treatment tool projecting port on a side approaching when the treatment tool is raised to a side wall surface portion thereof. The distal end portion of the endoscope according to 2 or 3. 5. The electrical insulating member is formed so as to cover only a part of a wall surface portion of the treatment instrument projecting port which is closer to the treatment instrument when the treatment instrument is raised.
The tip part of the endoscope according to 2 or 4.