JP2009213509A - Angle wire fixing structure of endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely fixing a wire attached when the wire is attachable to and detachable from an angle ring and to prevent the wire from moving at an attachment fixing portion. <P>SOLUTION: The angle wire fixing structure of an endoscope includes the wire 13 having locking small bodies 14 at the ends, wire fixing portions 16 having locking holes 17 to detachably lock the small bodies 14 of the wire 13, and an end body 10 (fitting portion 10K) fittingly connected to the end side of an angle ring 12 and forming a rear end contacting or approaching the end of the small bodies 14 arranged in the locking holes 17 of the wire fixing portions 16, and the small bodies 14 are detachably attached to the locking holes 17 of the wire fixing portions 16, and the movement of the small bodies 14 is regulated by the rear end of the end body 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an angle wire fixing structure for fixing, to an angle ring, an angle wire that bends the distal end portion and the angle portion of the endoscope on the distal end side of the endoscope.

  The endoscope includes a distal end portion where an objective optical system is disposed, an angle portion (curved portion) including an angle ring in an exterior body, an operation portion having a bending operation knob and the like, and a wire connected to the bending operation knob. A plurality of wires are arranged from the winding part to the tip ring of the angle ring, and the tip part and the angle part can be bent up and down and left and right by pulling the plurality of wires with a bending operation knob. It is like that.

FIG. 6 shows a configuration of the distal end side of a conventional endoscope. As shown in the drawing, the distal end side of the endoscope 1 has a structure in which an angle ring 3 is attached to a distal end body 2. It has become. The angle ring 3 is a ring coupling body that constitutes a multi-joint mechanism by pivoting a large number of rings alternately up and down, left and right, and a wire 5 is attached and fixed to a mounting portion 4 provided on the tip ring 3. The That is, the attachment portion 4 has, for example, a through hole, and the tip of the through hole is bent through the wire 5, and the wire 5 is fixed by brazing or soldering the through hole portion. Is done.
Japanese Utility Model Publication No. 3-78504 Japanese Patent Laid-Open No. 62-186836 JP 59-228620 A

  However, in the conventional endoscope, as described with reference to FIG. 6, the wire 5 for bending the distal end portion and the angle portion is fixed to the angle ring 3 by brazing or soldering. There was a problem that it was difficult to do. That is, the wire 5 of the endoscope whose diameter is reduced is thin and the attachment thereof is fine, so that it may be cut or detached at the attachment portion. In this case, in the repair and replacement of the wire 5 in FIG. 6, it is difficult to remove and replace only the wire 5, and it is necessary to replace the entire angle portion including the angle ring 3 at the same time, and the repair becomes complicated. Further, the entire angle portion is expensive, and there is a disadvantage that the cost of repair becomes high.

  The conventional techniques disclosed in Patent Documents 1 to 3 exist as focusing on such problems. In Patent Literature 1, a locking hole and a slit are provided in a locking tube disposed between a tip portion and a tip portion of a bending portion constituting ring, and a wire fixing member is inserted into the locking hole through the slit. The fixing member is configured to be fitted and locked in the locking hole. However, in this patent document 1, there exists a possibility that a wire fixing member may move to an outer peripheral direction, for example, and may remove | deviate from a locking hole.

  Patent Document 2 has a configuration in which a groove is formed on the outer periphery of the distal end main body of the endoscope, a stopper portion at the distal end of the wire is fitted into the groove, and the outer side is covered with an outer tube. In general, the tip body is equipped with a lens assembly, CCD, etc. for the observation optical system, so there is not enough space on the inner periphery, and it is difficult to fix the wire on the inner periphery of the tip body. become. In addition, since the tip main body is composed of the contents, and the holes for arranging the observation optical system, the light guide, etc. are processed later, when the wire is fixed on the inner periphery, the hole for the wire is formed. It is necessary to process, and the structure for fixing is also complicated. Therefore, in order to fix the wire tip to the tip body, a structure that is fixed to the outer periphery as in Patent Document 2 is common.

  However, in Patent Document 2, since a groove is formed on the outer periphery of the distal end portion main body, the thickness of the groove is required, and the diameter of the distal end portion main body cannot be reduced. The promotion of conversion will be hindered. On the other hand, since the interior of the angle ring is hollow throughout, the space other than the contents of the light guide, electrical cable, etc. is a dead space, and there is some margin compared to the tip body. Yes, if the wire is fixed on the angle ring side, it can be fixed on the inner peripheral side, and the outer periphery is not enlarged. Therefore, it is preferable to fix the wire on the angle ring side.

  In the above-mentioned Patent Document 3, a punching portion using a shape memory metal is provided on a joint piece constituting a bending portion, and a wire is attached at the time of transition of the high temperature phase of the shape memory metal, and is removed at the transition of the low temperature phase. It is configured. However, in this patent document 3, the shape memory metal is used, the transition work of a high temperature phase and a low temperature phase is complicated, and a manufacturing cost and a repair cost will also become high.

  In addition, when the wire is configured to be detachable, it is necessary to prevent the attachment fixing portion at the tip of the wire from being moved during mounting. That is, when one of the wires is pulled, the other wire is loosened in the distal direction, so that the loose-side wire is detached from the mounting and fixing portion, and the movement of the wire at the mounting and fixing portion is caused by the elongation of the wire. There is an inconvenience that leads to cutting.

  The present invention has been made in view of the above problems, and its purpose is to ensure that the wire is fixed when the wire is attached to and detached from the angle ring, and that the wire is fixed at the tip of the attachment fixing portion. Provides an angle wire fixing structure for an endoscope that does not move greatly in the direction, facilitates wire replacement, reduces repair costs, and does not hinder the promotion of endoscope diameter reduction. There is to do.

In order to achieve the above object, the endoscope angle wire fixing structure according to the first aspect of the present invention has a locking body (small lump) formed at the tip, and the angle ring is bent in order to bend the angle portion. A wire disposed on the peripheral surface side, a wire fixing portion provided to attach the wire to the angle ring, and formed with a locking hole for detachably locking the locking body; A front end portion body that is fitted and connected to the angle ring of the angle portion and has a rear end that is in contact with or close to the front end portion of the locking body disposed in the locking hole of the wire fixing portion; The locking body is detachably attached to the locking hole of the wire fixing portion, and the movement of the locking body is restricted at the rear end of the tip body.
The wire fixing portion of the invention according to claim 2 is attached to the side surface of the angle ring integrally or detachably.

  According to the configuration of the present invention, the wire fixing portion is attached to the side surface of the angle ring integrally or detachably, and the small body at the tip of the wire is inserted / engaged into the locking hole (two-stage hole) of the wire fixing portion. After that, the tip body is fitted to the angle ring, and the rear end of the tip body is placed in contact with or close to the tip of the small body. Is done.

  According to the endoscope angle wire fixing structure of the present invention, even when the wire is detachable from the angle ring, the wire is securely fixed when the wire is attached, and the wire moves greatly in the distal direction at the fixing portion. Therefore, there is an effect that the wire does not come off from the attachment fixing portion, and the wire is not stretched or cut. Therefore, wire replacement can be facilitated and the repair cost can be reduced. Further, since the wire is not attached to the endoscope distal end main body, there is an advantage that the promotion of the diameter reduction of the endoscope is not hindered.

  1 and 2 show an angle wire fixing structure of an endoscope according to a first embodiment, and an endoscope generally includes an insertion portion and an operation portion including a distal end portion and an angle portion (curving portion). Etc. That is, the tip body 10 of FIG. 1C is connected to the angle ring (the most advanced ring) 12 of FIG. , Openings 10a and 10b for the irradiation window and the light guide, an opening 10c for the observation window and the objective optical system, an opening 10d for the treatment instrument insertion channel, and the like.

  In the first embodiment, as shown in FIG. 1, a cylindrical locking body (stopper) 14 is fixed to the tip of the wire 13 by brazing, soldering, or the like. The winding wheel connected to the angle operation knob of the operation unit is also arranged. The small body 14 may be a small lump formed by bending and brazing the wire tip. On the other hand, on the inner periphery of the state-of-the-art angle ring 12, wire fixing portions 16 are provided, for example, at four positions every 90 degrees (these are drawn larger than the actual size). A locking hole (through-hole) comprising a small-diameter rear tube portion for arranging the wire 13 and a large-diameter front tube portion provided through a step in communication with the tube portion and locking the small body 14. ) 17 is formed. The length of the front tube portion of the locking hole 17 (the length in the axial direction) is formed substantially the same as the length of the small body 14.

Further, the length L ₁ [FIG. 1C] of the fitting portion 10K to the angle ring on the rear side of the tip body 10 and the length L ₂ from the tip of the angle ring 12 to the wire fixing portion 17 [FIG. 1 (B)] is set to substantially the same length (L ₁ ≈L ₂ ), so that the movement (position) of the small body 14 can be regulated by the rear end of the tip body 10. ing.

  According to the first embodiment having such a configuration, as shown in FIG. 2, the wire 13 is disposed through the locking hole 17 of the wire fixing portion 16 of the angle ring 12, and the wire 13 is inserted into the locking hole 17. The small body 14 at the distal end is locked, and then the distal end main body 10 is fitted from the distal end opening of the angle ring 12, whereby the wire 13 is attached. At this time, the rear end of the tip body 10 (fitting portion 10K) is brought into contact with the tip of the small body 14, and pressing the small body 14 restricts the movement of the small body 14 in the distal direction.

Thus, in the first embodiment, since the small body 14 is not brazed and soldered to the locking hole 17 of the fixing portion 16, if the tip end body 10 is removed from the angle ring 12, the wire 13 becomes an angle ring. 12 becomes detachable, and only the wire 13 can be exchanged. Further, since the small body 14 is pressed by the rear end of the fitting portion 10K (tip portion main body 10) which is substantially the same as the length from the tip of the angle ring 12 to the wire fixing portion 17 (L ₁ ≈L ₂ ), The wire 13 is not detached from the fixed portion 16, and the wire 13 is not stretched or cut.

FIG. 3 shows a modification of the first embodiment, in which the length of the small body 14 is made longer than the depth of the locking hole 17. In this case, the length L ₃ from the tip of the angle ring 12 to the tip of the small body 14 and the length L ₁ of the fitting portion 10K to the angle ring of the tip body 10 are substantially the same length (L ₁ By setting so that ≈L ₃ ), the movement of the small body 14 in the distal direction can be restricted.

  4 and 5 show an angle wire fixing structure of an endoscope according to the second embodiment. In the second embodiment, the wire fixing portion is detachable. As shown in the drawing, in the second embodiment, as shown in FIG. 4, as in the above-described embodiment, the rear tube portion on which the wire 13 is arranged and the step 14 are provided via a step. A fixing member 20 having a locking hole 17 formed with a front tube portion to be stopped is provided, and the small body 14 of the wire 13 is locked in the locking hole 17 of the fixing member 20. Yes. Further, the fixing member 20 has a cylindrical surface on the upper surface, and fixing grooves 21 having a width corresponding to the thickness of the angle ring 12 are formed on both side surfaces. The fixing member 20 is arranged for each of the four wires 13. Is done.

On the other hand, T-shaped attachment holes (detachment holes) 23 are provided on the side surface of the state-of-the-art angle ring 12 at four positions every 90 degrees on the outer circumference circle. A portion (front side portion) 23 a is sized to allow the fixing member 20 to be inserted, and a T-shaped vertical portion cut into the rear side serves as a locking portion 23 b for locking the fixing groove 21. Note that the lengths L ₁ and L _{2 of} the tip body 10 and the angle ring 12 are the same as those in the first embodiment.

  According to the configuration of the second embodiment, as shown in FIG. 5, the fixing member 20 is attached to the mounting hole in a state where the small body 14 of the wire 13 is locked to the locking hole 17 of the fixing member 20. 23 is inserted into the T-shaped horizontal portion 23a and is slid rearward (right side in the figure) while fitting the locking portions 23b, which are T-shaped vertical portions, into the grooves 21 on both sides. The fixing member 20 is mounted and fixed in the mounting hole 23. Thereafter, if the tip body 10 is inserted into the angle ring 12 from the tip opening, the wire 13 is attached to the angle ring 12 and fixed.

  Also in this case, if the tip body 10 is removed from the angle ring 12, the wire 13 can be attached to and detached from the angle ring 12, and only the wire 13 can be replaced. Further, since the movement of the small body 14 is restricted at the rear end of the distal end portion main body 10, the wire 13 is not detached, stretched or cut. Further, even when the fixing member 20 is damaged, there is an advantage that repair can be performed by replacing only the fixing member 20.

The angle wire fixing structure of the endoscope which concerns on 1st Example of this invention is shown, A figure (A) is a front view of an angle ring, A figure (B) is a side view, A figure (C) is a perspective view of a front-end | tip part main body. It is. It is sectional drawing which shows the structure of the front-end | tip part and angle part when a wire is attached in 1st Example. It is sectional drawing which shows the modification of 1st Example. It is a disassembled perspective view of the angle part which shows the angle wire fixing structure of the endoscope of 2nd Example. It is sectional drawing which shows the structure of the front-end | tip part and angle part when a wire is attached in 2nd Example. It is sectional drawing which shows the structure of the front-end | tip part and angle part of the conventional endoscope.

Explanation of symbols

2, 10 ... tip body, 3, 12 ... angle ring,
5, 13 ... wire, 10K ... fitting part,
14 ... Small body for locking, 16 ... Fixing part,
17 ... Locking hole, 20 ... Fixing member,
21 ... groove, 23 ... mounting hole.

Claims (2)

A wire formed on the inner peripheral surface side of the angle ring in order to bend the angle portion, with a locking body formed at the tip;
A wire fixing portion provided for attaching the wire to the angle ring, and having a locking hole for detachably locking the locking body;
A front end portion body that is fitted and connected to the angle ring of the angle portion and has a rear end that is in contact with or close to the front end portion of the locking body disposed in the locking hole of the wire fixing portion; With
An angle wire fixing structure for an endoscope in which the locking body is detachably attached to a locking hole of the wire fixing portion, and the movement of the locking body is restricted at the rear end of the distal end body.   2. The angle wire fixing structure for an endoscope according to claim 1, wherein the wire fixing portion is integrally or detachably attached to a side surface of the angle ring.

Images