JPH0519044Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an endoscope provided with a mesh tube fixing member for protecting the insertion portion.

[Problems to be solved by conventional techniques and ideas] In recent years, by inserting an elongated insertion section into a body cavity, it is possible to observe the internal organs of the body cavity, and when necessary, it is possible to insert forceps inserted into the forceps channel. BACKGROUND ART Medical endoscopes, which can be used to collect in-vivo tissues and diagnose affected areas in detail, are widely used. Furthermore, in the industrial field, industrial endoscopes are widely used to observe and inspect the inside of pipes in boilers, chemical plants, etc., the inside of engines, and the like.

If the insertion section of the industrial endoscope is repeatedly inserted into and removed from the subject, the outer circumferential surface of the insertion section will be damaged or broken. ), and the fixing of the mesh pipe to the tip component is described in Japanese Utility Model Application No. 59-22411 and Japanese Utility Model Application No. 59-22412.
As disclosed in Japanese Utility Model Publication No. 59-22413, the inner periphery and outer periphery of the end of the mesh pipe are clamped and fixed by a cylindrical member, and the cylindrical member is fitted onto the tip component. was fixed by being locked to the outer periphery of the tip component.

However, since the cylindrical member to which the mesh tube is fixed is attached to the outer periphery of the distal end component, the outer diameter of the distal end portion becomes larger than the outer diameter of the endoscope distal end member by the thickness of the cylindrical member.

[Purpose of the invention] The present invention was made in view of the above circumstances, and the purpose is to provide an endoscope that has a small outer diameter at the tip of the endoscope and can be securely fixed. do.

[Means and effects for solving the problems] A distal end component provided at the distal end of an endoscope insertion section and having a connecting portion at the rear, and an outer diameter equal to or less than the outer diameter of the distal end component; a fixing member provided at the distal end of a flexible tube that covers the insertion section and connected to a connecting portion of the distal end component; a locking member that engages the fixing member and the distal end component; The endoscope includes a falling-off prevention member that is fitted onto the distal end component to prevent the locking member from falling off, and the distal end of the endoscope can be made smaller in diameter.

[Example] The present invention will be specifically described below with reference to the drawings.

1 to 5 show embodiments of the present invention,
Figure 1 is a sectional view of the tip of the endoscope, Figure 2 is an explanatory diagram showing the entire endoscope, Figure 3 is a sectional view showing the core wire fixing method, and Figures 4 and 5 are the core wire fixing method. Regarding another modification, FIG. 4 is a sectional view showing a method of fitting the shield wire inside, and FIG. 5 is a sectional view showing a method of soldering the core wire.

As shown in FIG. 2, the (industrial) endoscope 1 is
A long and thin insertion section 2, a large-diameter operation section 3 connected to the rear end of the insertion section 2, and a light guide and signal cable 5 extending from the side of the operation section 3. It is configured.

A distal end adapter 6 is provided on the distal end side of the insertion section 2.
A rigid distal end portion 7 is provided, and a bendable bending portion 8 is provided on the rear side adjacent to the distal end portion 7. Furthermore, by rotating a bending operation knob 9 provided on the operating section 3, the bending section 8 can be bent in the vertical/horizontal direction.

A flexible portion 15 is connected to the rear side of the curved portion 8 .

The tip adapter 6 has a substantially cylindrical shape, and has an observation hole 11 in the front end surface parallel to the longitudinal direction of the insertion section 2.
and a through hole 12 for illumination light are formed.

A first lens 13 constituting the viewing angle changing lens system 10 is fitted into the front end of the observation hole 11, and a female thread 17 provided on the inner periphery of the observation hole 11 is screwed behind the first lens 13. A second lens 16 constituting the angle-of-view changing lens system 10 is fitted into a lens frame 14 having a mated male screw portion 18, and is provided so as to be movable in the longitudinal direction.

A light distribution lens system 19 is fitted and fixed in the illumination through hole 12.

The rear end surface of the tip adapter 6 is provided with a circular recess 21 into which the approximately cylindrical tip main body 22 provided at the tip 7 of the endoscope 1 can be inserted, and the center line between the tip adapter 6 and the insertion section 2 is aligned. are starting to match.

A threaded portion 23 is threaded on the rear end of the inner circumferential surface of the recessed portion 21, and a groove portion 26 in which an annular watertight member 24 such as an O-ring is inserted is formed on the inner circumferential surface in front of the threaded portion 23. is provided.

The tip main body 22 inserted into the recess 21 is
An observation hole 27 and an illumination hole 28 are provided parallel to the longitudinal direction of the insertion portion 2 .

The observation through hole 27 includes a first lens frame 31 in which an optical rod 29 is fitted, and a second lens frame 33 in which an objective lens system 32 is fitted behind the first lens frame 31. is inserted and positioned.

A cover glass 34 is fitted into the front end of the illumination through-hole 28, and the end face of the light guide fiber 36 inserted through the insertion portion 2 abuts and is fixed to the rear end face of the cover glass 34. has been done.

A stepped portion 37 and a stepped portion 38 are formed at the rear portion of the outer periphery of the tip body 22 so that the diameter becomes smaller toward the rear end, and a cylindrical prism frame 39 connects the front end surface to the stepped portion 37. It is fitted into the tip body 22 with its outer diameter matching the outer diameter of the tip body 22, and is fixed to the tip body 22 by a plurality of screws 41.

At the rear end of the prism frame 39, in order from the distal end side, there are a quadrangular prism-shaped optical rod 42, a first prism 43 and a second prism 44 as light guiding means.
is retained.

The optical rod 42 is arranged such that its front end surface and rear end surface are perpendicular to the optical axis of the objective lens system 32, and the front end surface of the first prism 43 is fixed to the rear end surface of the optical rod 42. has been done. Further, the rear end side of the first prism 43 is sloped. On the other hand, the second prism 44 is formed into a wedge shape, and the front end surface is the sloped surface of the first prism 43 so that the thin part is on the tip side.
It is fixed to 6. The rear end surface 47 of the second prism 44 is oblique with respect to the longitudinal direction of the insertion section 2, and the imaging surface side of the solid-state image sensor 48 is in contact with the rear end surface 47. It is placed at an angle to the

A substrate 51 is attached to the side opposite to the imaging surface of the solid-state image sensor 48, and the solid-state image sensor 48 or the substrate 51, or the solid-state image sensor 48 and the substrate 5
1 are fixed to the prism frame 39 by adhesive or the like.

The rear end side of the board 51 is bent so that a core wire connection part 52 is extended so that the mounting surface of the solid-state image sensor 48 faces rearward, and the core wire connection part 52 is provided on the board 51 extended to the front end side and between the board 51 and the back end thereof. Electronic components 53 are mounted on the back surface.

The rear outer peripheral surface of the prism frame 39 has a stepped portion 54.
is provided, and a narrow diameter portion 56 is formed. The thin diameter portion 56 has a substantially cylindrical shape and the substrate 51
Cover member 5 as a tip component that can accommodate
7 is fixed with its front end surface in contact with the step portion 54. The front part of the outer circumferential surface of the cover member 57 is formed with a narrow diameter part 59 that tapers forward by a step part 58, and the rear part has a narrow diameter part 59 as a connecting part that tapers rearward by a step part 61. A portion 62 is formed.

A connecting ring 63 having an outer diameter equivalent to the outer diameter of the tip adapter 6 is provided on the outer peripheral surface of the narrow diameter portion 59.
is inserted so as to be rotatable on the outer peripheral surface of the narrow diameter portion 59. The front outer peripheral surface of the connecting ring 63 has a plurality of slits 65, 65, . . . in the longitudinal direction.
A threaded portion 64 having a diameter is provided so that it can be screwed into the threaded portion 23 provided on the inner circumferential surface of the rear end of the tip adapter 6. Further, a convex portion 66 is provided on the front inner circumferential surface of the connecting ring 63.
is provided so that it can be engaged with a recess 67 provided on the front outer peripheral surface of the cover member.

The narrow diameter portion 62 at the rear of the cover member 57 includes:
Furthermore, the narrow diameter portion 6 that becomes narrower toward the rear due to the step portion 68
9 is formed.

A plurality of core wires 71, 71, .
A disk-shaped ring stopper 74 having a core wire through hole 72 and a light guide through hole 73 is fitted and fixed so as to expose a part of its outer peripheral surface.

At the exposed portion of the ring stopper 74, there are a number of substantially annular joint pieces 76, 76, which are rotatably connected in the longitudinal direction of the insertion part 2 within the curved part 8.
A joint piece 76 at the foremost end of the ring is fitted onto the outside and fixed to a ring stopper 74 with a screw 77.

The joint piece 76 is a flexible tube member 78
The front end of the tube member 78 is fitted with a narrow diameter portion 69 so as to come into contact with the stepped portion 68 . Furthermore, the outer periphery of the tube member 78 is covered with a protective outer covering 79 made of a mesh tube or the like made of thin metal wires braided into a net shape.

The front end of the protective jacket 79 is externally fitted into a narrow diameter portion 85 formed by a stepped portion 82 at the rear of a cylindrical fixing member 81 having an outer diameter equal to or less than the outer diameter of the cover member 57. The front end surface of the protective outer sheath 79 is adapted to abut against the stepped portion 82 .

A protective jacket 79 fitted over the fixing member 81
A cylindrical stopper 83 having an outer diameter equivalent to the outer diameter of the fixing member 81 is fitted onto the outer periphery of the front end of the fixing member 81 and the protective outer cover 79 by a fixing means such as solder.
It has come to be firmly attached.

A plurality of screws 84 as locking members are inserted into the front part of the fixing member 81 in the radial direction so as to penetrate from the outer circumferential surface to the inner circumferential surface. The screw 84 is inserted into the recess 86
The protective outer sheath 79 and the tip 7 are connected by abutting and pressing the tip.

A cylindrical drop-off prevention member 87 is loosely fitted around the outer periphery of the cover member 57 and the outer periphery of the fixing member 81 including the screw 84 in order to prevent the screw 84 from falling off. The outer diameter of the falling-off prevention member 87 is equivalent to the outer diameter of the tip adapter 6, and a stepped portion 8 is provided at the front of the inner peripheral surface.
8 is provided so as to come into contact with a stepped portion 58 provided on the cover member 7.

By the way, the core wire through hole 73 of the ring stopper 74 is designed as shown in FIG. 3.

At the rear part of the core wire through hole 73, an enlarged diameter part 92 is formed by a stepped part 91. A wire stopper 93 of the same diameter is fitted and fixed.

A shield wire 94, which covers the outer periphery of the core wire 71, is enlarged in diameter and fitted onto the narrow diameter portion of the wire stopper 93, and is fixed to the small diameter portion by soldering or a conductive adhesive or the like to maintain continuity.

The core wire 71 is inserted through the wire stopper 93 and connected to the core wire connection portion 52, and the core wire connection portion 52 and its vicinity are covered and fixed with a reinforcing member 96 such as an adhesive. Further, the core wire 71 is fixed to a wire fastener 93 using a fixing member 97 such as an insulating adhesive.

Further, the core wire through hole 73 may be configured as shown in FIG. 4.

At the rear part of the core wire through hole 73, an enlarged diameter part 92 is formed by a stepped part 91. A wire stopper 93 of the same diameter is fitted and fixed.

A shield wire 94, which covers the outer periphery of the core wire 71, is inserted into the wire fastener 93, and is fixed to the wire fastener 93 with continuity maintained by soldering, conductive adhesive, or the like.

The core wire 71 is fixed to a wire fastener 93 and a fixing member 97 such as an insulating adhesive.

Furthermore, the core wire through hole 73 may be configured as shown in FIG.

At the rear part of the core wire through hole 73, an enlarged diameter part 92 is formed by a stepped part 91. A first wire stopper 98 of the same diameter is fitted and fixed.

A shield wire 94 that covers the outer periphery of the core wire 71 is fitted onto the first wire stopper 98,
The electrical connection is maintained by soldering or a conductive adhesive, and the wire is fixed to the first wire stopper 98 .

An enlarged diameter part 101 whose diameter is enlarged by a stepped part 99 is formed at the front part of the core wire through hole 73, and the enlarged diameter part 101 has a stepped part 102 on its inner peripheral surface. , a cylindrical insulating member 103 whose front part is enlarged in diameter is fitted.

The expanded diameter portion 101 is provided with a cylindrical second wire stopper 104 having the same inner diameter as the core wire through hole 72.
It is fitted.

The core wire 71 is fixed to the second electric wire fastener 104 with a fixing member 106 made of solder or the like that establishes conduction.

By the way, the connection between the tip part 7 and the curved part 8 is achieved by temporarily retracting the elastic protective jacket 79 toward the operating part 3, and then connecting the joint piece 76 and the ring stopper 74.
After fixing with the screws 77, the protective jacket 79 can be stretched to cover the outer periphery of the connection part.

Furthermore, the screw 84 as a locking piece connecting the cover member 57 and the fixing member 81 is connected to the falling-off prevention member 87.
This prevents it from falling off.

The fall prevention member 87 is inserted from the front of the cover member 57 and is prevented from coming off by the connection ring 63. Moreover, the connection ring 63 is
The convex portion 66 provided on the inner circumferential surface abuts the outer circumferential surfaces of the tip main body 22 and the cover member 57, and is inserted by expanding the diameter thereof.

The fall prevention member 87 is provided to prevent the screw 84 from falling off as described above, and should be made thinner in terms of strength compared to the fixing member provided at the tip of the outer jacket. is completed, cover member 5
The protective outer sheath 79 can be reliably fixed to the distal end portion 7 by making it slightly thicker than the outer diameter of the tip portion 7 .

In this embodiment, the tip adapter 6 is detachably provided, but the present invention is not limited to this configuration, and can be applied to a direct view only machine or a side view only machine, etc., in which the tip adapter is not attached. Needless to say, it is. In that case,
By making the thickness of the falling-off prevention member 87 as thin as possible, the diameter of the tip portion 7 can be reduced. Further, in this embodiment, an electronic scope is described, but the present invention may be applied to a fiber scope.

[Effects of the invention] As explained above, according to the invention, a small-diameter outer sheath connection part is extended to the rear part of the cover member, and a fixing member provided at the end of the sheath of this connection part is externally fitted. By doing so, there is an effect that the diameter of the tip portion can be reduced and reliable fixation can be achieved.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention,
Figure 1 is a sectional view of the tip of the endoscope, Figure 2 is an explanatory diagram showing the entire endoscope, Figure 3 is a sectional view showing the core wire fixing method, and Figures 4 and 5 are the core wire fixing method. Regarding another modification, FIG. 4 is a cross-sectional view showing a method for inserting the shield wire, and FIG. 5 is a cross-sectional view showing a method for soldering the core wire. 1... Endoscope, 2... Insertion section, 7... Tip part,
57... Cover member, 79... Protective outer covering, 81
... Fixing member, 84 ... Screw, 87 ... Falling prevention member.

Claims (1)

[Scope of utility model registration request] A distal end component provided at the distal end of the endoscope insertion section and having a connecting portion at the rear; and a distal end component provided at the distal end of a flexible tube that covers the insertion portion and connected to the connecting portion of the distal end component. a fixing member having an outer diameter substantially equal to or less than that of the tip component; a locking member that locks the fixing member to the tip component; and a member that prevents the locking member from falling off and is externally fitted on the fixing member. An endoscope comprising: