JP3659831B2 - Endoscope - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope having a treatment instrument channel.
[0002]
[Prior art]
At present, endoscopes are widely used in the medical field. At the distal end of the insertion portion of the endoscope, an objective lens for observing the inside of the body cavity, a light guide for illuminating the inside of the body cavity, and a treatment such as forceps Built-in materials such as a channel for inserting the device into the body cavity are provided.
[0003]
For example, the following endoscopes are disclosed in Japanese Patent Application Laid-Open No. 8-299258 and Japanese Patent Application No. 10-160503 by the same inventors as the present application. That is, in the endoscopes disclosed in these publications, a tube body constituting a channel is attached to a through hole provided in a distal end member via a metal protective pipe. In this way, the tip of the channel is reinforced by providing the metal protective pipe at the tip of the channel. Therefore, for example, when a forceps having a cup is accommodated in the channel with the cup open, the cup hits the protective pipe and is forcibly closed by the protective pipe, so that the inner surface of the channel is not damaged.
[0004]
Furthermore, Japanese Patent Application No. 10-160503 discloses an endoscope in which a channel hole of an insulating cover is formed to be relatively thick. In this structure, the channel opening is made of an insulating member, thereby reducing the possibility that the treatment instrument electrode and the distal end body are electrically connected. At the same time, by increasing the thickness of the channel opening of the insulating cover, damage to the channel due to insertion of the treatment instrument is suppressed.
[0005]
[Problems to be solved by the invention]
However, the aforementioned tip member is generally made of metal, and the metal tip member and the metal protective pipe are in contact with each other and are in an electrically conductive state. For this reason, when a high-frequency treatment instrument such as an electric scalpel is inserted into a body cavity via a channel to perform treatment, a high-frequency current flowing to the high-frequency treatment instrument leaks and flows to the distal end member via the protective pipe, There is a possibility that sufficient high-frequency current does not flow through the ablation site and treatment cannot be performed. In addition, there is a possibility that the endoscope itself is damaged due to discharge from the treatment instrument electrode to the protective pipe.
[0006]
Also in the structure of Japanese Patent Application No. 10-160503, it is the same that the protective pipe that is electrically connected to the tip body is exposed, and thus high frequency discharge has not been completely prevented. Moreover, since the insulating cover is made of resin, the protection effect against damage due to the insertion of the treatment instrument was inferior to that of the metal member.
[0007]
The present invention has been made paying attention to such circumstances, and is an endoscope having a channel capable of preventing damage and high-frequency discharge due to insertion of a treatment instrument and capable of performing high-frequency treatment safely and efficiently. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In the endoscope, the endoscope is provided at a distal end of the insertion portion of the endoscope, and is made of a metal distal portion main body that holds the imaging device, a through hole provided in the distal end portion main body, and an inner portion of the insertion portion. A resin tube for insertion of a treatment instrument, which is provided so that one end side covers the inner periphery of the through hole, and a metal fitting fitted inside the through hole via the tube An endoscope having a protective pipe .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment according to the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a distal end portion of an insertion portion of an endoscope.
[0010]
An endoscope 2 having an insertion portion 1 shown in FIG. 1 includes an insertion portion 1, a thick operation portion (not shown) connected on the proximal end side of the insertion portion 1, and a proximal end side of the operation portion. It is composed of a cord (not shown) extending from the side. The cord is connected to a light source device and an image processing device (not shown).
[0011]
The insertion portion 1 is connected to a hard distal rigid portion 3, a bendable curved portion 4 that is coupled on the proximal end side of the distal rigid portion 3, and a proximal end side of the curved portion 4. It is comprised from the soft part which has.
[0012]
The distal end rigid portion 3 is composed of a metal distal end portion main body 5 and a resin insulating cover 6 that covers the front end portion main body 5 from the front surface to the side peripheral surface. The distal end body 5 has an imaging device through-hole 8 for arranging an imaging device 7 for imaging a subject image, a channel through-hole 10 for arranging a treatment instrument channel 9 for inserting a treatment instrument, and A light guide through hole (not shown) for providing a light guide (not shown) is provided. The insulating cover 6 includes an imaging device opening 11 coaxial with the imaging device through-hole 8, a channel opening 12 coaxial with the channel through-hole 10 and having a diameter smaller than the channel through-hole 10, The light guide through hole and a coaxial light guide opening (not shown) are provided.
[0013]
The bending portion 4 is configured by connecting a plurality of node rings 13, and the most advanced first node ring 14 is externally fitted to the outer periphery on the proximal end side of the distal end portion body 5. The outer periphery of the distal end rigid portion 3 and the curved portion 4 is covered with a resin-made outer tube 15.
[0014]
The treatment instrument channel 9 disposed in the channel through-hole 10 includes a resin tube 16 inserted through the insertion portion 1, a metal protection pipe 17 provided on the inner periphery of the distal end portion of the tube 16, and this protection. It is comprised from the metal spiral tube 18 provided in the outer periphery of the tube 16 of the proximal end side from the pipe 17. FIG. The distal end surfaces of the tube 16 and the protective pipe 17 of the treatment instrument channel 9 substantially coincide with each other, and the protective pipe 17 is fitted inside the inner periphery of the tube 16. Further, the tube 16, the protection pipe 17, and the tip end surface of the tip end body 5 are all applied to the rear surface of the insulating cover 6 in a substantially matched state, and the protection pipe 17 and the tip end portion main body 5 do not contact each other. It is like that. The outer diameter D1 of the protective pipe 17 is set larger than the inner diameter D2 of the channel opening 12 of the insulating cover 6.
[0015]
Next, the operation will be described.
Since the tube 16 or the insulating cover 6 is interposed between the protective pipe 17 and the tip body 5 and the protective pipe 17 and the tip body 5 are not in contact with each other, the protection pipe 17 and the tip body 5 are not in contact with each other. 5 is electrically insulated.
[0016]
When a treatment instrument having a cup is accommodated in the treatment instrument channel 9, the cup hits the protective pipe 17 at the tip and is forcibly closed.
Furthermore, since the outer diameter D1 of the protective pipe 17 is set larger than the inner diameter D2 of the channel opening 12 of the insulating cover 6, the protective pipe 17 does not fall off.
[0017]
Next, the effect of the first embodiment will be described.
Since the protective pipe and the tip body are electrically insulated, even if a high-frequency treatment instrument is inserted into the treatment instrument channel and energized, damage to the endoscope due to discharge from the high-frequency treatment instrument to the tip section main body is prevented. It can be prevented and the leakage current can be greatly reduced, so that a safe and effective treatment can be performed.
[0018]
Moreover, since the protective pipe is disposed at the distal end portion of the treatment instrument channel, it is possible to prevent damage to the inner peripheral surface due to the treatment instrument insertion.
Furthermore, since the outer diameter of the protective pipe is larger than the channel opening of the insulating cover, it does not fall off.
[0019]
Furthermore, as described above, since the configuration is almost the same as that of a conventional endoscope, assembly is easy and inexpensive.
(Second Embodiment)
A second embodiment will be described with reference to FIG. FIG. 2 is a cross-sectional view of the distal end portion of the insertion portion of the endoscope. Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
[0020]
As shown in FIG. 2, a protective pipe 31 is disposed on the inner periphery of the distal end portion of the treatment instrument channel 9 according to the second embodiment. The protective pipe 31 has an outer diameter slightly smaller than the inner diameter D4 of the channel opening 32 of the insulating cover 6 in order from the tip, and a tip portion 33 disposed inside the channel opening 32, and the tip portion 33. A flange portion 34 having a diameter larger than the outer diameter of the tube 16 and a fitting portion 35 that fits on the inner periphery of the tube 16. The length of the front end portion 33 is substantially the same as the thickness of the insulating cover 6, and is set so that the front surface of the flange portion 34 abuts the rear surface of the insulating cover 6. Further, the outer diameter D3 of the flange portion 34 is set to be larger than the inner diameter of the channel opening 32.
[0021]
The end of the tube 16 abuts against the rear surface of the flange portion 34 of the protective pipe 31, and is fitted and inserted into the channel through hole 10 integrally with the protective pipe 31 by the fitting portion 35.
[0022]
A counterbore portion 36 having a diameter larger than the inner diameter of the channel through hole 10 is provided on the distal end side of the channel through hole 10 of the tip body 5. The inner diameter D5 of the counterbore portion 36 is a flange portion 34. The inner diameter is set to be sufficiently larger than the outer diameter D3 of the flange portion 34 so as to have a spatial distance such that no high frequency discharge occurs between the front end portion body 5 and the front end portion body 5. Although this spatial distance varies depending on the output of a high-frequency power source combined with an endoscope, in the case of a digestive organ or bronchial endoscope, the spatial distance is preferably 0.1 to 0.2 mm or more. Further, the depth L1 of the counterbore part 36 is also set so as to be a spatial distance such that high-frequency discharge does not occur between the flange part 34 and the tip body 5. The space surrounded by the flange portion 34, the tube 16, the tip end body 5, and the insulating cover 6 is filled with an insulating adhesive 37.
[0023]
Next, the operation will be described.
The metal tip body 5 and the metal protection pipe 31 are not in contact with each other and are electrically insulated from each other. In addition, since the counterbore portion 36 is provided in the tip portion main body 5, a sufficient space distance is secured, and no discharge occurs between the tip portion main body 5 and the protective pipe 31.
[0024]
Further, since the distal end portion of the protection pipe 31 of the treatment instrument channel 9 is disposed inside the channel opening 12 of the insulation cover 6, the insulation cover 6 is not exposed in the treatment instrument channel 9. Furthermore, since the outer diameter D3 of the flange portion 34 of the protective pipe 31 is set larger than the inner diameter D4 of the channel opening 32 of the insulating cover 6, the protective pipe 17 does not fall off.
[0025]
Next, the effect of the second embodiment will be described.
In the second embodiment, in addition to the effects of the first embodiment, the tip of the protective pipe is arranged inside the channel opening of the insulating cover, so that the insulating cover is not exposed in the treatment instrument channel. In addition, it is possible to prevent damage to the inner peripheral surface of the treatment instrument channel by the treatment instrument and to prevent damage to the inside of the channel opening of the insulating cover.
[0026]
In addition, by providing a counterbore and filling the adhesive, it is possible to further prevent discharge between the tip body and the protective pipe.
Furthermore, the present invention includes the inventions listed below.
(Appendix)
(Appendix 1) A metal tip body provided at the distal end of the insertion portion, an insulating cover that covers the tip side of the tip body, the tip body and the insulating cover, and the outside of the insulating cover In an endoscope having a treatment instrument channel opening on the surface, a metal protection member is provided on the inner periphery of the treatment instrument channel, and the protection member and the distal end body are electrically insulated. Features an endoscope.
(Additional remark 2) The said protective member is a metal pipe, The endoscope of Additional remark 1 characterized by the above-mentioned.
(Supplementary Note 3) The endoscope according to Supplementary Note 1 or 2, wherein the protection member is a metal flanged pipe-shaped member (Appendix 4). The endoscope according to appendix 1, appendix 2 or appendix 3, wherein the endoscope is separated by a distance at which no high-frequency discharge occurs.
(Additional remark 5) The endoscope 2 of additional remark 4 characterized by the above-mentioned. The insulating filler is arrange | positioned between the said front-end | tip part main body 5 and the protection member which were spaced apart.
[0027]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the damage of the channel by a treatment tool can be prevented, and a high frequency treatment can be performed safely and efficiently.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a distal end portion of an insertion portion of an endoscope.
FIG. 2 is a cross-sectional view of a distal end portion of an insertion portion of an endoscope.
[Explanation of symbols]
5 Tip body 6 Insulation cover 9 Treatment instrument channel 16 Tube 17 Protective pipe 31 Protective pipe 34 Flange part 36 Counterbore part 37 Filler

Claims (1)

In an endoscope,
A tip end body made of metal that is provided at the tip of the insertion portion of the endoscope and holds the imaging device;
A through hole provided in the tip body;
A resin-made tube for inserting a treatment instrument, which is inserted into the insertion portion and provided so that one end side covers the inner periphery of the through-hole,
A metal protective pipe fitted inside the through hole via the tube;
The endoscope characterized by having .

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