JPH0641528Y2 - Endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an endoscope in which a distal end forming section and a channel inserted through an insertion section are connected by a guide tube.

[Prior Art] In recent years, by inserting an elongated insertion portion into a body cavity, various internal medical treatments can be performed by observing organs and the like in the body cavity and, if necessary, using a treatment instrument inserted in a treatment instrument channel. Endoscopes are widely used.

By the way, the general configuration of the distal end portion of the endoscope is as shown in FIG.

In the figure, inside the insertion portion 71, there is a treatment instrument channel tube 74, an image guide 76, a light guide (not shown), an air / water supply tube (not shown), and a CC for an electronic endoscope.
The signal line connected to D is inserted. In particular, the treatment instrument channel tube 74, the air / water supply tube, and the light guide tube are externally fitted to the guide tube 73 brazed to the distal end portion forming portion 72 as shown in FIG. However, as the distal end portion of the endoscope is made thinner, the outer diameter of the distal end constituent portion becomes thinner, and a sufficient brazing portion (second
It becomes difficult to secure (t portion shown in the figure) on the rear end face side of the front end forming portion 72. As a result, the mounting strength of the guide tube 73 is weakened, the guide tube 73 is easily separated from the tip forming portion 72, and it becomes impossible to secure sufficient water tightness.
In addition, since it becomes impossible to ensure watertightness, body fluid or the like may enter the endoscope and damage various built-in components.

In Japanese Patent Laid-Open No. 56-116440, a guide tube is passed through the tip rigid portion, and the guide tube is fixed by brazing on the rear surface side of the tip rigid portion. A technique is disclosed in which an acid-resistant sealing material is filled over the entire circumference between the front end face and the front end face.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an endoscope in which the diameter of the distal end portion of the endoscope is reduced while securing the mounting strength and watertightness of the guide tube. To do.

[Means and Actions for Solving the Problems] The endoscope of the present invention is provided with an opening for fixing the distal end forming portion and the guide tube on the outer peripheral wall surface of the distal end forming portion of the insertion portion. .

An opening is provided in the distal end forming portion provided in the insertion portion of the present invention. The guide tube provided in the tip forming portion is exposed from the opening, and the exposed guide tube and the tip forming portion are fixed to each other.

Embodiments Embodiments of the present invention will be specifically described below with reference to the drawings.

1 to 5 relate to a first embodiment of the present invention.
The figure is an explanatory view of the tip of the endoscope, and FIG. 2 is the BB ′ of FIG. 1.
FIG. 3 is a sectional view taken along line AA ′ in FIG. 1, FIG. 4 is a perspective view of the distal end portion of the endoscope, and FIG. 5 is an overall configuration diagram of the endoscope apparatus.

As shown in FIG. 5, the endoscope device 1a of the present embodiment includes an endoscope 1, a light source device 21 for supplying illumination light to the endoscope 1,
A video processor 22 provided with a signal processing circuit for controlling the endoscope 1, a monitor 23 connected to the video processor 22 for displaying an endoscopic image, a video tape deck 24 for recording the endoscopic image, and It is composed of a video printer 26 for printing an endoscopic image and a video disk device 27 for recording an endoscopic image on a disk.

The endoscope 1 includes an elongated and flexible insertion portion 2 and a large-diameter operation portion 3 that is connected to the rear end of the insertion portion 2. A flexible universal cord 4 is laterally extended from the operation portion 3, and a connector 5 at an end portion of the universal cord 4 is provided. This connector 5
Is connected to the light source device 21. Further, a signal code 28 is extended to the connector 5, and the signal code 28 is connected to a video processor 22 having a signal processing circuit built therein.

The insertion portion 2 has a rigid tip portion 6 on the tip side, and a bendable bending portion 7 is provided on the rear portion of the tip portion 6. Further, a flexible tube 8 is provided at the rear of the curved portion 7.

In FIG. 1, the tip portion 6 has a tip constituting member 10 as a tip constituting portion, and the tip constituting member 10 has an observation window 39.
An illumination window (not shown), an air / water supply port (not shown), and a forceps channel port 40 are provided. Inside the lighting window,
A light distribution lens (not shown) is mounted, and a light guide 31 made of a fiber bundle is continuously provided at the rear end of the light distribution lens. The light guide 31 is inserted through the insertion portion 2, the operation portion 3 and the universal cord 4 and connected to the connector 5. Then, the illumination light emitted from the light source lamp in the light source device 21 is incident on the incident end of the light guide 31. Also, the observation window
An objective lens system 43 is mounted inside 39, and a solid-state imaging device 48 (hereinafter abbreviated as CCD) is disposed at an image forming position of the objective lens system 43. The signal transmission cable 32 connected to the CCD 48 is inserted through the insertion section 2, the operation section 3 and the universal cord 4 and connected to the connector 5.
Further, it is connected to the video processor 22 via a signal code 28.

An air / water supply tube 33 is connected to the air / water supply port via an air / water supply tube connection pipe 34. The air / water supply tube 33 is inserted through the insertion portion 2, the operation portion 3 and the universal cord 4 and connected to the connector 5.

The bending portion 7 is formed by connecting a large number of substantially cylindrical bending pieces 11, 11, ...
The outer peripheral portion of 11 is covered with a curved rubber 13.

A tip cover 41 is attached to the tip constituent member 10 provided in the tip portion 6. At the front of the observation through hole 38 that forms the observation window 39 formed in the tip constituent member 10 and the tip cover 41, in front of the objective forming the objective lens system 43 via the first lens frame 42. Ball 44 is installed. A second lens frame 45 is fixed to the inside of the first lens frame 42, and another lens system of the objective lens system 43 is mounted on the second lens frame 45. An element frame 47 is connected to the rear end of the second lens frame 45, and a CCD 48 is fixed to the element frame 47. The lead 48 of the CCD 48 has an electronic component 50
The boards 49, 49 on which are mounted are connected. The substrate 49
To the signal transmission cable via the cable fixing member 51.
32 is connected. The cable 32 is a coaxial cable, a cable core wire 52 is connected to the substrate 49, and a shield wire 54 is a shield member 5 that covers the CCD 48 and the substrate 49.
Connected to 6. The cable core wire 52 and the shield wire 54 are covered with an insulating tube 53 and a covering tube 55, respectively.

The cable 32 is composed of a pressing tape 61, a comprehensive shield 62, a comprehensive covering tube 63 and a cable protection tube 64.
They are covered in order. Further, the outer periphery of the shield member 56 and the connecting portion of the cable 32 are made of an insulating heat-shrinkable tube 66.
Is covered by.

A forceps channel tube 35 is connected to a forceps channel through hole 37 that forms a forceps channel opening 40 formed in the tip forming member 10 via a channel connection pipe 67 as a guide tube. tube
Reference numeral 35 is inserted through the insertion portion 2 and connected to a forceps insertion opening (not shown) provided in the operation portion 3. Further, a light guide 31 is connected to a lighting through hole forming the lighting window via a light guide connection pipe 36.

The air supply / water supply tube connection pipe 34, the light guide connection pipe 36, and the channel connection pipe 67 are fixed to each other by brazing between the outer peripheral surface and the rear end surface of the tip constituent member 10.

In addition, a fixing hole 57 as an opening is provided on the outer peripheral surface of the distal end forming member 10 so as to communicate with the forceps channel through hole 37 in the substantially radial direction. The outer peripheral surface of the channel connection pipe 67 exposed to the outside from the fixing hole 57 is fixed to the tip forming member 10 by brazing.

As described above, in this embodiment, the channel connecting pipe 67 and the tip constituent member 10 are fixed to each other by the rear end surface of the tip constituent member 10 and the fixing hole 57, and the outer diameter of the tip constituent member 10 is small. Even when the diameter is reduced and the brazing portion indicated by t on the outer circumference of the channel connecting pipe 67 cannot be sufficiently removed as shown in FIG. 2, the brazing is performed in the fixing holes 57, and therefore the brazing is performed. The area of the part can be sufficiently compensated, and the mounting strength and watertightness can be secured.

FIG. 6 is a perspective view of a distal end portion of the endoscope according to the second embodiment of the present invention.

In this embodiment, the opening is a notch.

A channel connection pipe 67 is fitted into the forceps channel through hole 37 of the distal end constituting member 10 of the present embodiment as in the first embodiment. A fixing notch 69 is provided toward the front from the rear end side edge of the tip forming member 10. This notch
A part of the outer peripheral surface of the channel connection pipe 67 is exposed to the outside from 69, and the exposed portion and the tip forming member 10
It is fixed by brazing.

The channel connection pipe 67 is fixed to the rear end surface of the tip end constituent member 10 by brazing as in the first embodiment.

Other configurations are similar to those of the first embodiment.

In this embodiment, by extending the fixing notch 69 in the longitudinal direction of the insertion portion 2, the brazing portion can be made longer than in the first embodiment, and the mounting strength and watertightness can be further improved.

In each of the above-described embodiments, only the fixation of the channel connection pipe 67 is described, but the invention is not limited to this, and the light guide connection pipe 36, the air / water supply connection pipe 34, or the like may be used.

Further, in each of the above-described embodiments, the electronic endoscope having the fixed image pickup device has been described, but the present invention is not limited to this, and an optical endoscope having an image guide may be used.

Furthermore, the fixing method is not limited to brazing and may be performed by an adhesive or the like.

[Effects of the Invention] As described above, according to the present invention, by providing the opening portion for brazing in the distal end constituent portion, the mounting strength and watertightness of the guide tube can be ensured, and the endoscope distal end portion can be secured. The diameter can be reduced.

[Brief description of drawings]

1 to 5 relate to a first embodiment of the present invention.
The figure is an explanatory view of the tip of the endoscope, and FIG. 2 is the BB ′ of FIG. 1.
Direction sectional view, FIG. 3 is a sectional view taken along the line AA ′ in FIG. 1, FIG. 4 is a perspective view of the distal end portion of the endoscope, FIG. 5 is an overall configuration diagram of the endoscope device, and FIG. FIG. 7 is a perspective view of a distal end portion of an endoscope according to the second embodiment of the present invention, and FIG. 7 is an explanatory view of the distal end portion of the endoscope according to a conventional example. 1 …… Endoscope, 2 …… Insertion part 6 …… Tip, 10 …… Tip component 33 33 Air supply / water supply tube 34 …… Air supply / water supply tube Connection pipe 35 …… Forceps channel tube 36 …… Light Guide connection pipe 37 …… Through hole for forceps channel 40 …… Forceps channel port 57 …… Fixing hole 67 …… Channel connection pipe

Claims (1)

[Scope of utility model registration request] 1. A tip forming member which is provided at a tip of an insertion portion and has a through hole formed along an axial direction of the insertion portion, and a thin tubular member, wherein the through hole is provided with the tip forming member. A guide tube that is inserted so that one end side thereof projects from the rear end, and an outer surface of a portion of the guide tube that projects from the rear end of the tip constituent member and a rear end surface of the tip constituent member, A first fixing portion that is fixed by brazing or gluing; a flexible channel tube that is fitted and connected to the rear end side of the guide tube; and an outer peripheral surface of the tip component that communicates with the through hole. An opening provided and a second fixing portion for fixing the peripheral surface of the opening and the outer surface of the guide tube inserted in the through hole by brazing or gluing. And an endoscope.