JPH0641524Y2 - Endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an endoscope in which a hood is attached to the tip of an insertion portion.

[Prior Art] Generally, in a direct-viewing endoscope, for example, it is possible to easily collect a polyp that has occurred in the large intestine after excision, or to keep the distance between the observation site and the distal end surface of the insertion section constant. A hood is often attached to the tip of the insertion portion so that the hood can be maintained. However, in an endoscope having a metallic tip body at the tip of the insertion section, the entire surface of the tip body is covered with an electrically insulating cover in order to prevent electric shock accidents during high-frequency treatment.
I couldn't put on the hood.

Therefore, in order to eliminate such a problem, a screw part is provided on the outer circumference of the tip end body, and a hood made of an electrically insulating material is screwed into the screw part and mounted.
-96001 publication.

[Problems to be Solved by the Invention] However, in such an endoscope, the distal end portion of the outer skin of the insertion portion is tightly bound to the outer peripheral surface on the proximal end side of the distal end body with a thread, and the tightly bound portion is bonded with an adhesive. I was trying to harden it with.
As a result, a gap is created between the surface of the adhesive and the inner surface of the hood, and liquid such as water or body fluid penetrates into the gap and electrically connects with the threaded portion of the tip body. Also, since the hood is movable by turning, a gap is created between the inner peripheral surface of the hood and the outer peripheral surface of the tip cover that covers the tip side of the tip body, and liquid is also present in the gap. It will penetrate and become electrically conductive with the threaded portion of the tip body. Therefore, the high-frequency current may leak to the outside through the threaded portion of the tip body during the high-frequency treatment.

The present invention has been made in view of the above circumstances, and its purpose is to prevent high-frequency current from leaking to the outside through the tip body during high-frequency treatment and to ensure electrical safety during high-frequency treatment. To provide an endoscope that can secure

[Means and Actions for Solving the Problems] In order to solve the above problems, the present invention has a distal end body made of metal at the distal end of an insertion portion, and the outer periphery on the proximal end side of the distal end body has the above insertion. In the endoscope in which the distal end surface and the outer peripheral surface on the distal end side are covered with a distal end cover, and the hood is screwed on the intermediate peripheral surface, the outer periphery of the intermediate portion of the distal end body is covered. An electric insulating ring is attached to the surface, the outer cover is continuously fixed to the base end side of the electric insulating ring, and the tip cover is covered and fixed to the tip side of the electric insulating ring. A metal ring having a width smaller than that of the electrically insulating ring and having a threaded portion for screwing and mounting the hood on the outer periphery thereof is mounted on the. The electrically insulating ring electrically cuts off the metal ring from the tip body to prevent leakage of high frequency current even if liquid enters the threaded portion of the metal ring. The liquid is prevented from penetrating into the outer peripheral surface of the tip portion main body, and high frequency current is prevented from leaking from that portion as well.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
The endoscope shown in FIG. 2 includes an insertion portion 1. The insertion portion 1 is formed in the order of the flexible tube portion 3, the bending portion 4 and the tip portion 5 from the operation portion 2 side, and the outer periphery thereof is covered with an elastic outer cover 8 made of an electrically insulating material.

The operation portion 2 is provided with a bending operation knob 6 and a universal cord 7 connected to a light source device (not shown), and the bending operation knob 6 allows the bending portion 4 to be remotely operated for bending. ing.

As shown in FIG. 1, a metallic tip body 9 is provided at the tip of the insertion portion 1. The tip portion of the outer cover 8 is tightly bound to the outer peripheral surface of the tip end body 9 on the base end side by a thread 10, and the bound portion is fixed with an adhesive 11 and fixed to the tip end body 9. A tip cover 12 is adhesively fixed to the tip surface of the tip body 9 and the outer peripheral surface on the tip side. As a result, the tip end body 9 is electrically insulated on the base end side by the outer cover 8, and the tip end side is on the tip cover.
Electrically isolated by 12.

An electric insulating ring 13 is externally fitted and adhesively fixed to the outer periphery of the middle portion of the tip portion main body 9 which is not covered with the outer cover 8 and the tip cover 12. A metal ring 14 having a screw portion 15 for screwing and mounting a hood 16 made of an electrically insulating material is adhered and fixed to the outer periphery of the electric insulating ring 13, and the screw portion is provided at an intermediate portion of the inner peripheral surface of the hood 16. A female thread portion 17 that is screwed into 15 is formed.

The width dimension of the metal ring 14 is smaller than the width dimension of the electrical insulating ring 13. As a result, both ends of the electric insulating ring 13 are exposed from both ends of the metal ring 14, the base end side thereof is covered by the tip end portion 8a of the outer cover 8, and the tip end side is covered by the base end portion 12a of the tip cover 12. It is covered. Therefore, the boundary line extending from both ends of the metal ring 14 to the surface of the tip end body 9 is bent in a stepwise manner. In addition, the outer cover 8 covering the electric insulating ring 13
The ends of the end cover 12 and the end cover 12 are fixedly adhered to the electrical insulating ring 13.

As shown in FIG. 1, the tip cover 12 is provided with a forceps channel port 20, an observation window 21, and the like. The observation window 21 is a window lens 24 in a cylindrical frame 23 attached to the hole 22 of the tip cover 12,
The mask 25 and the condenser lens 26 are sequentially incorporated.

A first through hole 27 penetrating in the axial direction of the tip end main body 9 is formed at a position facing the observation window 21. An image guide mouthpiece 28 is fitted into the first through hole 27 with its base end side protruding from the rear end surface of the tip end body 9. This image guide base 28 has multiple condenser lenses.
An objective optical system 33 including 29, 31, and 32 is provided, and the objective optical system 33 forms an observation image in the visual field on the front end surface of the image guide fiber 34.

The tip of the image guide fiber 34 is fitted into the connection mouthpiece 35, and the connection mouthpiece 35 is connected to the image guide mouthpiece 28.
It is fitted and fixed in. Image guide fiber 34 above
The tip portion of is fixed by an adhesive so that no deviation occurs in the image between the tip surface and the eyepiece 2a side provided on the operation portion 2. The length L ₁ of the tip portion of the image guide 34, which is hardened by the adhesive, is set longer than the length L ₂ of the connection mouthpiece 35. Therefore, the base end portion of the image guide fiber 34, which is hardened by the adhesive, protrudes from the rear end surface of the connection mouthpiece 35 by a predetermined dimension. 34 is prevented from being broken. The portion of the image guide fiber 34 protruding from the connection mouthpiece 35 is covered with an inner tube 36, and the inner tube 36 is covered with an outer tube 37.

A second through hole 41 is axially formed in a portion of the tip portion main body 9 facing the forceps channel port 20. One end side of the channel mouthpiece 42 is fitted into the base end side of the second through hole 41, and the tip end portion of the channel tube 43 is connected to the base end side.

In addition, as shown in FIG.
A through hole 45 is formed. One end side of a light guide base 47 externally fitted to the tip end portion of the light guide fiber 46 is fitted into these third through holes 45. The light guide fiber 46 is covered with a tube (not shown).

Further, as shown in FIG.
A through hole 51 is formed. A cleaning nozzle 53 is connected to the distal end of the through hole 51 facing the observation window 21, and one end of an air supply cap 54 is fitted to the proximal end. The tip of an air supply tube 55 is connected to the other end of the air supply mouthpiece 54, the outer periphery of the connection portion is bound by a first thread 56, and the portion is fixed with an adhesive 57.

In the vicinity of the fourth through hole 51, a fifth through hole 61 whose one end is open only on the base end face side of the tip end body 9 is formed. The fifth through hole 61 communicates with the fourth through hole 51 by a communication passage 62, and one end of a water supply mouthpiece 63 is fitted therein. The tip of a water supply tube 64 is connected to the other end of the water supply cap 63. The outer peripheral surface of the connection portion of the water supply tube 64 is tightly bound by the second thread 65, and that portion is fixed by the adhesive 66.

The first thread 56 that binds the air supply tube 55 and the second thread 65 that binds the water supply tube 64 are axially displaced as shown in FIG. Therefore, it becomes easy to bind the above-mentioned yarns in a narrow space, so that it is possible to provide the air supply mouthpiece 54 and the water supply mouthpiece 63 close to each other, thereby reducing the diameter of the insertion portion 2. The workability is also improved.

One end of the communication passage 62, which communicates the pair of fourth through holes 51, opens to the outer peripheral surface of the tip portion main body 9 via a large diameter portion 67 having a diameter larger than that of the communication passage 62. A lid 68 having a chevron-shaped head 68a is fitted into the large-diameter portion 67 and fixed with solder 69. As a result, one end of the communication passage 62 is closed.
By providing a mountain-shaped head 68a on the lid 68, the large-diameter portion 6
Since the amount of solder 69 for closing 7 is small, the cost can be reduced and the workability can be improved.

An image guide fiber 34, a light guide fiber 46, an air supply tube 55 and a water supply tube are attached to the tip end main body 9.
When connecting 64, first, the image guide base 28, the light guide base 47, the air supply base 54 and the water supply base 63 are connected to the tip body 9 and soldered. Then, by connecting fibers and tubes to the respective bases, it is possible to prevent these fibers and tubes from being deteriorated due to the thermal influence of soldering.

Further, the flexibility of the internal organs inserted into the insertion portion 1 such as the image guide fiber 34, the light guide fiber 46, the air supply tube 55, and the water supply tube 64 is set to be substantially the same. As a result, these built-in components are bent in a substantially similar shape when the bending portion 4 is bent, and thus are less likely to be damaged. The flexibility of each of the above-mentioned built-in components is, for example, the image guide fiber 34 or the light guide fiber.
In the case of 46, it can be changed by changing the material and wall thickness of the tube that covers them, or by making the tube double, etc., and the air supply tube 55 and the water supply tube 64 can also be changed by these wall thickness and material. You can

According to the endoscope configured as described above, the metal ring 14 having the screw portion 15 for screwing and mounting the hood 16 is electrically insulated from the tip portion main body 9 by the insulating ring 13. Moreover, since the outer peripheral surface of the widthwise rear end portion of the electric insulating ring 13 is covered with the outer cover 8 and the outer peripheral surface of the front end portion is covered with the front end cover 12, the front end passes through both ends of the electric insulating ring 13. Liquid such as water or body fluid is prevented from entering the part body 9. Therefore, even if a liquid such as water or body fluid enters the inner peripheral surface of the hood 16, the liquid does not electrically connect to the tip body 9, so that a high frequency current is generated during the high frequency treatment. It is possible to prevent leakage to the outside through 9.

Further, in order to observe the body wall 71, when the hood 16 having a length protruding from the tip of the tip body 9 is attached as shown in FIG. 5, the tip of the hood 16 is pushed onto the body wall 71. By attaching it, the body wall 71 is inserted into the hood 16. Therefore, if the distance L ₄ from the observation window 21 to the tip of the hood 16, that is, the protruding length of the hood 16 is set to be longer than the focal length L ₃ of the objective optical system 33, the body wall 71 in the hood 16 is Even if it is inserted, the body wall 71 can be well observed.

FIG. 6 shows another embodiment of the present invention, in which a ridge 72 is provided on the outer peripheral surface of the rear end portion of the electrical insulating ring 13, and the ridge 72 is provided.
The rear end face of the metal ring 14 is joined to one side face, and the front end face of the outer cover 8 is joined to the other side face, and they are adhered with an adhesive. The outer peripheral surface of the electric insulating ring 13 on the tip side is covered with a tip cover 12. Even in such a structure, the liquid that has infiltrated the inner surface of the hood 16 is prevented from electrically connecting to the tip body 9.

[Advantage of the Invention] As described above, according to the present invention, the metal ring having the screw portion for mounting the hood is mounted on the tip end main body through the electric insulation ring, and the base end side of the outer peripheral surface of the electric insulation ring is attached. Cover with the outer skin of the insertion part, cover with the tip cover,
Further, a metal ring having a width dimension smaller than that of the electrically insulating ring and having a threaded portion for screwing the hood onto the outer periphery is attached to the middle portion of the electrical insulating ring.

Therefore, at least the boundary line extending from the end portion of the metal ring on the tip cover side to the surface of the tip portion main body is bent in a stepwise manner, so that not only the thrust direction but also the outer peripheral surface of the metal insulating ring and the inner peripheral surface of the tip cover. Since the and are joined even in the axial direction, the strength in the axial direction is also improved, so that the fixed portion is prevented from peeling off. Thereby, it is possible to prevent the high frequency current from leaking to the outside through the tip body during the high frequency treatment.

[Brief description of drawings]

FIG. 1 is a sectional view of the distal end portion of an insertion portion showing an embodiment of the present invention, FIG. 2 is an overall view of an endoscope, and FIG. 3 is an A- of FIG.
A sectional view taken along line A, FIG. 4 is a sectional view taken along line BB in FIG. 3, and FIG. 5 is a sectional view showing a state in which a hood having a length different from that of the hood shown in FIG. FIG. 6 is a sectional view of a metal ring mounting structure showing another embodiment of the present invention. 1 ... Insertion part, 8 ... Outer skin, 9 ... Tip body, 12 ...
Tip cover, 13 ... electrical insulation ring, 14 ... metal ring, 15 ... screw part, 16 ... hood.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Michio Sato 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Fumiaki Ishii 2-43-2 Hatagaya, Shibuya-ku, Tokyo Within Olympus Optical Co., Ltd. (72) Tatsuya Yamaguchi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Takeaki Nakamura 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Co., Ltd. (72) Inventor Yoshian Aoki 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (56) Reference JP-A-63-249535 (JP, A) 62-180401 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A distal end body made of metal is provided at the distal end of the insertion part, the outer periphery of the proximal end side of the distal end body is covered by the outer skin of the insertion part, and the distal end surface and the outer peripheral surface on the distal end side are distal ends. In an endoscope in which a hood is screwed on the outer peripheral surface of the middle part while being covered by a cover, an electric insulating ring is mounted on the outer peripheral surface of the middle part of the distal end body, and a base end of the electric insulating ring is attached. The outer cover is fixedly provided on one side, the tip cover is fixed to the tip side of the electric insulating ring by coating, and the width of the electric insulating ring is formed to be smaller than that of the electric insulating ring in the middle part thereof. An endoscope comprising: a metal ring having a threaded portion for screwing a hood.