JPH0363025A - Endoscope - Google Patents

Abstract

PURPOSE:To enable a tip side of endoscope to be made slim by forming an annular concave part on outer peripheral face of a bending piece at the endmost tip of the endoscope, fitting and fixing a cover member of the bending piece to the concave part. CONSTITUTION:A tip construction 21 is cylindrical in shape and formed with a tip hardware 25, which is made small in diameter by a step at its rear end side. The endmost bending piece 26 is fit and fixed to the outer face of the small diameter part of the tip hardware 25. This bending piece 26 is cut out annularly at e.g. its outer periphery of front end side to form an annular concave part 63 with a diameter made smaller by the depth of cut-out. As a tip of a blade 61, which covers at least a bending part 22, is received in this annular convex part 63 and fixed by solder 64, the tip construction 21 is prevented from becoming large in diameter. Furthermore, holes 65 are formed by turning down slit parts at the top, bottom, right and left of the concave part 63, and every wire 57i is inserted through the holes and fixed to the concave part 63 with silver solder 66.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endoscope in which a concave portion is formed in a part of a bending piece to fix a bending portion covering member.

[Prior art] In a flexible endoscope with a flexible insertion section, a curved piece is connected to a part of the insertion section to form a curved section, and the other end of a wire with one end fixed to the tip of the curved section is used. Widely used are devices whose curved portions can be bent by pulling the material.

For example, in JP-A No. 62-186836, a wire is fitted into a groove provided in the axial direction on the circumferential surface of the tip component, and a bending piece covers the outside of the wire to prevent the wire fitted into the groove from coming off. ing. Additionally, the tip of the wire is bent to prevent it from slipping out of the groove. Furthermore, a method is also disclosed in which the wire is fixed to the groove part with solder or the like to further strengthen the attachment.

On the other hand, in Japanese Utility Model Application Publication No. 63-59601, the blade is fixed to a first bending piece, a part of the first bending piece is cut and bent, and a wire is inserted therein and fixed.

[Problems to be Solved by the Invention] In the conventional example disclosed in JP-A-62-186836, a groove for fixing the wire is provided on the outer periphery of the tip component, so this groove creates a space for fixing the internal components. As a result, there is a problem in reducing the diameter of the tip component.

For example, in the case of an electronic endoscope, it is necessary for operation to align the direction P of the moving image unit with the UP side of the tip of the endoscope, that is, the UP side of the bending direction. For light distribution, if illumination lenses are provided on the left and right sides of the imaging unit, the imaging unit will be placed on the central axis in the vertical direction of the tip.If a wire fixing part is provided in the tip component, each internal organ will be fixed. Since it interferes with the hole in the tip forming part, the wire fixing part must be brought out to the outside, resulting in a larger diameter tip.

In addition, when soldering the wire to the wire fixing groove, the heat of soldering affects the internal components, so the internal components must be assembled after the wire is fixed to the tip component, which reduces work efficiency. It's bad. Furthermore, it is necessary to heat the tip component in order to flow the solder into the wire fixing groove, but this is inefficient since the tip component is considerably larger than the groove.

On the other hand, in the conventional example disclosed in Japanese Utility Model Application Publication No. 63-59601, the wire fixing part cuts and bends a part of the tip curved part and fixes the wire there. The thicker the wall, the more it protrudes inward, reducing the space for internal organs.

Furthermore, if a bonding agent is applied on top of the blade in order to fix the blade covering the curved portion, the blade will swell and become larger in diameter.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an endoscope whose distal end side can be reduced in diameter without becoming thicker by fixing the blade.

[Means and effects for solving the problem] In the present invention, a recess is provided on the outer surface of the curved part, and the end of the blade is fixed in the recess, and the end of the wire is inserted into a hole made by cutting the recess inward. The diameter of the hard part on the tip side can be reduced by fixing the tip.

[Example] Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIGS. 1 to 4 relate to a first embodiment of the present invention.
The figure shows the structure of the distal end side of the electronic endoscope of the first embodiment, FIG. 2 shows a cross section taken along the line A-A' in FIG. 1, and FIG. 3 shows an enlarged view of the wire fixing part in FIG. 1. FIG. 4 shows an endoscope apparatus equipped with the first embodiment.

As shown in FIG. 4, the electronic endoscope device 1 includes an electronic endoscope 2 of the first embodiment equipped with an imaging means, and an electronic endoscope 2 equipped with an imaging means. J! A light source device 3 that supplies illumination light to a mirror 2, and this electronic endoscope 2
a video processor 4 that performs signal processing corresponding to the video processor 4; a monitor 5 that displays video signals output from the video processor 4; a TVR deck 6 and a video disc 7 that are connected to the video processor 4 and record video signals, etc.
and a video printer 8 that prints out the video signal as a video.

The electronic endoscope 2 has an elongated insertion section 11, and a daifuku operation section 12 is formed at the rear end of the insertion section 11, and a universal cord 13 extends from the operation section 12. Connector 14 at the tip of this universal cord 13
By connecting the light source device 3 to the light source device 3, the white light from the lamp 15 is focused by the condenser lens 16, and the light guide 1
7 is supplied to the incident end face. One connector of a signal cable 18 can be connected to this connector 14, and by connecting one connector at the other end to the video processor 4, the signal processed by the electronic endoscope 2 as a decoy image can be processed. It is converted into a predetermined video signal and output to a monitor 5 or the like.

The insertion section 11 has a hard distal end component 21 formed at its distal end, a bendable curved section 22 formed in the rear portion adjacent to the distal end component 21, and a bending operation (not shown) formed in the operating section 12. By rotating the knob, this curved portion 22 can be bent left and right or up and down.

An insertion port 23 into which a treatment instrument is inserted is provided in a portion near the front end of the operating section 12, and this insertion port 23 communicates with a treatment instrument channel provided within the insertion section 11.

FIG. 1 shows the structure of the tip structure portion 21 to which the tip of the light guide 17 is fixed.

This tip component 21 is formed by forming a metal tip into a cylindrical bottom shape to form a tip metal fitting 25, and making the rear end side of the outer periphery of this tip metal have a step-like narrow diameter so that a cutting edge curved part 26 is fitted onto the outside. , is fixed to this metal tip 25 with adhesive, brazing, or the like.

The front end of the next curved part 27 is rotatably connected to the rear end of the most advanced curved part 26 by a pivot 28, and this curved part 27
Further, the next curved portion 27 is rotatably connected to the rear end. In this way, a plurality of bay pieces 26.27.27.
... are rotatably connected to each other to form a curved portion 22. Note that the tip forming portion 21, that is, the hard section on the tip side extends to the rear end of the tip metal fitting 25 and the most distal curved portion 26.

The front end surface and the outer circumference of the front side of the tip metal fitting 25 are covered with an insulating cover 29 formed of an insulating material, and the outer circumference of the rear side is covered with an outer cover 30.
covered with.

A lens frame 34 having a through hole in the axial direction and mounting an objective lens system 33 is fixed to the tip metal fitting 25 with screws 35, and a solid-state image sensor (hereinafter abbreviated as SID) is mounted at the back of the objective lens system 33. ) 36 is fixed to the lens frame 34 with screws 38.

This imaging unit 37 includes an S to which a 5ID 36 is attached.
5ID 36 and this 5I inside the ID frame 39 and the shield member 41 whose front end is fitted onto the SID frame
A wiring board 42 arranged on the back side of the D36, a hybrid IC board (on which a peripheral circuit IC and other electrical components are mounted) 43, a wiring board 42 and a hybrid IC board 43,
A cable fixing member 45 for fixing the tip of a multi-core shielded wire 44 connected to the C board 43 is housed, and after being housed, the shield wire portion is attached to the shield member 41 with a conductive adhesive 46.
It is adhesively fixed so as to be electrically conductive, and the outside thereof is further fixed with an insulating adhesive 47.

After focusing, the SID frame 39 is fixed to the lens frame 34 with a screw 38.

The external lead terminals 36a, . has been done.

The multicore shielded wire 44 includes a shielded wire and a single wire, and a portion of the core wire and single wire of each shielded wire is connected to the wiring board 42, the hybrid board 43, and the cable fixing member 4.
5.

The shield member 41 is attached to the SID frame 39 with a conductive adhesive 45.
It is adhesively fixed to the cable fixing member 45 with a 1 mm adhesive 46. After adhesively fixing with the conductive adhesive 46, the multicore shielded wire 44 is adhesively fixed to the cable fixing member 45 and the shield member 41 with an insulating adhesive 47'r.

Except for the fitting portion of the shield member 41, the SID frame 39
, the outer diameter of the shield member 41, and the SI of the lens frame 34.
The outer surface except for the fitting portion with the D frame 39 is coated with insulation, and is insulated from the metal tip 25.

In the case where the imaging unit 37 is fixed to the lens frame 34 with screws 38, the lens frame 34 is fixed to the tip metal fitting 25 with screws 35 made of an insulating material such as ceramic, and sealed with a sealant 48 that also serves as a locking agent.

The front edge of the lens frame 34 is notched, and the space between the lens frame 34 and the metal tip 25 is sealed with a gasket 49.

The inner diameter of the through hole formed adjacent to the objective lens system 33 and the imaging unit 37 is slightly enlarged on the rear side, and the channel tube pro gold 51 is fixed with solder, adhesive, or the like.

A channel tube 52 is adhesively fixed to a rearwardly projecting portion of the channel cap 51.

Further, as shown in FIG. 2, light guides 53 and 54 are provided on both sides of the line connecting the decoy image unit 37 and the channel base 51, and air supply pipes 55 are provided on both sides of the image carrier unit 37. and a water supply pipe 56 are provided.

By the way, the curved portions 26, 27 . Bending operation wires 57a, 57b; 58 for transmitting a bending driving force to and bending these curved portions 26.27°...
The rear end side of c, 58d is wound around a wire drum that is rotated by a bending operation knob (not shown), and by rotating the wire drum, a pair of bending operations are performed.
a, 57b or 57c, 57d (for example, 57a) is pulled, the other wire (for example, 57b) is relaxed, and the pulled wire 57i (i = a, b, c
.

The structure is such that the curved portion 22 is curved toward the d) side.

Therefore, the pair of wires 57a, 57b and the wire 57
The distal end side of curved section 27.c, 57d is curved section 27.c of curved section 22. ...
Wire guides 59, 59, . . . attached to the inner wall are inserted through the wire guides 59, 59, .

In this embodiment, the wire fixing part 60 of the wire 571 and the blade fixing part 62 of the blade 61 covering the curved part 22 are provided in a structure that does not reduce the storage space for built-in items.

For example, the outer periphery of the front end side of the most advanced curved portion 26 is annularly cut out, and as shown in FIG. is stored in this annular recess 63, and half fB
The blade fixing portion 62 is structured to fix the tip of the blade 61 by soldering at 64.

Therefore, since the blade tip is accommodated in the four parts 63 and fixed with the solder 64, it is possible to prevent the solder 64 for fixing the blade from swelling and the tip forming part 21 to have a large diameter.

Although the curved portion 27 of the blade fixing portion 62 is thin, since soldering is performed, its strength is reinforced and the strength can be prevented from decreasing.

Furthermore, in this embodiment, notches are made at four locations on the top, bottom, left and right sides of the recess 63, and the cut portions are bent inward in the radial direction to form wires 57.
The wire fixing portion 60 has a structure in which holes 65 through which the wires 57i can pass are formed, and each wire 57i is inserted therethrough and fixed with silver solder 66. Since the hole 65 is formed from a thin portion, the portion protruding inward in the radial direction can be made sufficiently smaller than in the case where the hole 65 is not made thin. Therefore, narrowing of the storage space for internal organs stored on that side can be minimized.

The blade fixing part 62 and the wire fixing part 60 allow the hard part on the distal end side forward of the rear end of the most distal curved part 26 to have a small diameter.

FIG. 5 shows a curved section of a second embodiment of the invention.

In this second embodiment, as in the first embodiment, an annular recess 63 is provided in the most extreme curved portion 26 so that the tip of the blade can be fixed. In addition, the identification part of the blade is the first one.
Since it is similar to the embodiment, it is not shown in FIG. Also, a wire 57a is made by cutting in two places on the upper and lower sides and bending it inward to form holes 65 and 65, so that it can be bent in the vertical direction.

Wire fixing parts 6o and 60 of 57b are formed.

On the other hand, a part of the outer periphery of the second bending piece 27 pivotally attached to the most advanced bending part 26 is cut out at two places in the left and right direction (only one is shown in FIG. 5) to form a recess, and a notch is formed. It is inserted and bent inward to form a hole, through which a left-right bending wire 57C (only one is shown) is inserted and fixed by brazing.

Note that the rear end of the second bending piece 27 has a third
It is pivotally connected to the front end of the bending piece 27.

The rest is the same as the first embodiment.

This second embodiment has the same functions and effects as the first embodiment, and is divided into two curved parts 27 and 26, each with one curved part.
By fixing the pair of wires, the space for storing internal organs in the hard portion on the distal end side can be increased, and the diameter can be made smaller.

FIG. 6 shows a portion of a third embodiment of the invention.

In this embodiment, as shown in FIG. 1 or FIG.
A fixing portion 60 of 57b is provided near the rear end of this curved portion 26.

In this way, since the position of the wire fixing part 60 protruding inward has been moved rearward, it is possible to prevent it from interfering with the large diameter portion of the shield member 41 when storing the imaging unit 37, for example.

Therefore, it is advantageous for the m-diameter ratio, and the most advanced curved portion 2
By shortening the length of 6, the length of the hard part can be shortened.

As shown in FIG. 7, an annular recess 63' is provided on the inner circumferential side of the bending piece (for example, 26). established,
A wire (for example, 57a) may be inserted through it and fixed by brazing with silver solder 66 or the like. In this case, the blade 62 is fixed on the outer periphery of the bending piece 26 with solder 64.

Although each of the above-mentioned embodiments has been described as an electronic endoscope, the present invention can be similarly applied to a fiberscope.

In addition, the above-mentioned 1. In the third embodiment, a part of the annular recess for fixing the blade is also used for fixing the wire, but the recess for fixing the wire need not be provided in an annular shape as in the second embodiment.

Further, the recess for fixing the blade may be provided in the shape of an elliptical ring.

[Effects of the Invention] As described above, according to the present invention, a recess is formed on the outer peripheral surface of the bending piece on the tip side to fix the tip of the blade,
Since the wire is fixed by being bent inward, the storage space for internal items on the distal end side of the insertion section can be increased, and the diameter of the distal end side can be reduced.

[Brief explanation of drawings]

FIGS. 1 to 4 relate to a first embodiment of the present invention.
The figure shows the structure of the distal end side of the electronic endoscope of the first embodiment.
2 is a sectional view taken along the line AA' in FIG. 1, FIG. 3 is an enlarged sectional view of the wire fixing part and blade fixing part in FIG. 1, and FIG. 4 is a sectional view of the first embodiment. FIG. 5 is a sectional view showing a part of the curved portion of the second embodiment of the present invention, and FIG. 6 is a cross-sectional view of the curved portion of the third embodiment of the present invention. FIG. 7 is a cross-sectional view showing a part of the wire fixing means. 2...Electronic endoscope 11...Insertion section 21...
- Tip structure part 22... Curving part 25... Tip hardware 26.27... Curving piece 37... m image unit 57a, 57b, 57c, 57d-... Wire 60...
・Wire fixing part 61...Blade 62...Blade fixing part 63...Concave part 64...Half 1)
65...hole 66...Silver solder Figure 2 Figure 4 Figure 3 Figure 7 Procedural City Official Book (self-sponsored) Figure 7

Claims (1)

[Claims] A plurality of bending pieces are pivotally connected in series, the outer periphery of which is covered with a bending part covering member fixed to the leading edge and the rearmost bending pieces, and the plurality of bending pieces are fixed to the cutting edge pieces. In the endoscope that allows the bending tube to be bent by pulling or relaxing an operating wire, an annular recess is formed on the outer circumferential surface of the most extreme bending piece, and an end of the bending portion covering member is disposed in the recess. and the curved portion covering member is fixed in the recessed portion.