JP5555016B2 - Guide tube for bent tube passage - Google Patents

Description

  The present invention relates to a bent tube passing guide tube used when an endoscope having a long insertion portion reaches a deep portion of a pipe having a plurality of bent tubes.

  In general, an endoscope applicable for industrial use and medical use is provided with a long insertion portion. For example, in an industrial endoscope, an insertion portion may be inserted deep into a pipe to inspect the pipe for corrosion or scratches. In this endoscopic inspection, when the dimensional difference between the inner diameter of the tube to be inspected and the outer diameter of the insertion portion of the endoscope is large, the flexible tube portion is bent or meandered in the tube, so that the insertion portion It becomes difficult to insert deeply well. In order to eliminate this problem, a tightly wound coil having a through hole having an optimal dimensional difference with respect to the outer diameter of the insertion portion of the endoscope is inserted into the deep portion in advance, and then penetrated through the coil. The insertion portion was inserted to the deep portion through the hole and the inspection was performed.

  However, when the insertion portion is inserted deep into a winding pipe having a plurality of bent pipes (also referred to as elbows), the following problems occur. That is, as shown in FIG. 1, the tip of the closely wound coil 104 is caught by the step 103 which is the joint between the elbow pipe 101 and the straight pipe 102 constituting the pipe 100 as shown by the broken line. It becomes difficult to insert deeply.

  In order to solve this problem, Patent Document 1 discloses an insertion aid for an endoscope that can be inserted into a multi-curved pipe composed of a bent joint and a straight pipe with a burr without damaging the endoscope. It is shown. In this endoscope insertion aid, when the tightly wound coil that is stretchable and rigid, which is the outer skin, is caught by a step or burr and it becomes difficult to insert only by pushing operation, the operator holds the operation part Rotate the member. Then, the closely wound coil is rotated, so that the screw can move forward and advance through the coil pitch for each rotation, and can be inserted while overcoming the step.

  Further, in Patent Document 2, the insertion portion is quickly inserted deep into a pipe having a large dimensional difference between the inner diameter dimension of the tube and the outer diameter dimension of the insertion portion and having a plurality of elbow portions. A possible endoscopic device is shown. In this endoscope apparatus, when observing deep inside a pipe having a plurality of elbow parts with an endoscope, first, a first tubular member having a direction switching means is inserted along the pipe, and this tubular member is inserted. If the tip side of the arm reaches the elbow part, the direction of the guide path is made to coincide with the pipe back direction. Next, a second tubular member having a smaller diameter than the first tubular member and provided with a direction switching means is inserted into the guide path of the first tubular member, and the second tubular member is inserted into the first tubular member. Projecting from the provided direction switching means. Thereafter, the second tubular member is pushed deeper along the pipe, and when the distal end side of the tubular member reaches the elbow portion, the direction of the guide path is made to coincide with the pipe deep direction. Next, the next tubular member is inserted into the second tubular member, and the above operation is repeated. Then, an insertion portion guide member configured by inserting a plurality of tubular members is inserted deeply.

Japanese Patent Laid-Open No. 60-150023 Japanese Patent No. 4109031

  However, in the endoscope insertion aid of Patent Document 1, the tightly wound coil is advanced by the rotation operation of the operation unit, so that the rotation operation becomes a burden on the operator as the number of bending joints increases. .

  On the other hand, in the endoscope apparatus of Patent Document 2, it is necessary to repeatedly perform an insertion operation for reaching the tubular member to the elbow portion and an adjustment operation for matching the direction of the guide path of the annular member to the pipe back direction in the elbow portion. As the tubular member becomes long and thin, the insertion operation and the adjustment operation may become difficult.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bent tube passing guide tube that can be smoothly inserted into a pipe having a plurality of bent tubes by a pressing operation. .

The bent tube passing guide tube according to the present invention includes an outer coil constituted by a close coil spring, and a distal end side and a proximal end side which can be inserted into the outer coil and are slidable with respect to the outer coil. An inner coil composed of a close-contact coil spring protruding from each end opening, through which an insertion portion of an endoscope can be inserted, and having a coarsely wound coil portion provided at the tip, and sliding on the outer peripheral surface of the inner coil A projecting length defining member that is fixed to the inner coil projecting from the outer coil base end opening and is in contact with the outer coil base end to define a projecting length of the inner coil from the outer coil distal end opening; A pull-in preventing member that prevents the inner coil from being pulled into the outer coil by abutting a proximal end surface of the outer coil on the outer circumferential surface of the coarsely wound coil portion of the inner coil. And withdrawing prevention The member is a flange-shaped portion that is provided at one end of the tubular portion, has an elastic force, and protrudes in a predetermined dimension from the outer peripheral surface of the tubular portion, and the flange-shaped portion extends in the circumferential direction of the tubular portion. A plurality are provided.

  According to this configuration, the bent tube passage guide tube is inserted into the pipe with the inner coil protruding from the distal end surface of the outer coil. Then, when the tip of the inner coil comes into contact with the curved surface in the bent tube, the guide tube for passing the bent tube is further pushed in, so that the coarsely wound coil portion at the tip of the inner coil is deformed and its traveling direction Can be changed to penetrate into the straight tube and continue the insertion work. On the other hand, when the tip of the inner coil is caught in the step and the insertion is stopped, the operation of twisting the inner coil and the operation of moving the inner coil forward are performed simultaneously. Then, the inner coil is repelled in the pipe, and the catching with the step is eliminated, and the straight pipe enters. Thereafter, the insertion operation is resumed by pushing in the bending tube passing guide tube.

  ADVANTAGE OF THE INVENTION According to this invention, the guide tube for bending pipe | tube passage which can be smoothly inserted by pushing operation to the deep part of piping which has a some bending pipe | tube is realizable.

The figure explaining the malfunction where the tip of a densely wound coil gets caught in the level difference of piping with a bent pipe 2 to 4B relate to the first embodiment of the guide tube for passing the bent tube, and FIG. 2 is a view for explaining the configuration of the guide tube for passing the bent tube. The figure explaining the state where the guide tube for passing the bent pipe has reached the bent pipe in the middle of the pipe The figure explaining the state where the front-end | tip part curves and the drawing-in prevention member does not contact | abut a level | step difference after the curved tube passage guide tube contact | abuts to an inner curved surface. The figure explaining the state where the drawing-in prevention member fixedly installed at the tip of the curved tip portion entered the straight pipe The figure explaining the state where the drawing-in prevention member fixed at the tip of the tip part was caught by the step between the bent pipe and the straight pipe located in the back of the pipe The figure explaining the procedure which cancels | releases the catch of the drawing-in prevention member caught in the level | step difference, and intrudes a drawing-in prevention member in a straight pipe | tube The figure explaining the other structural example of a drawing-in prevention member 6 to 7B are views for explaining the operation of the pull-in preventing member in FIG. 5, and FIG. 6 is a view for explaining a state in which the pull-in preventing member reaches the bent pipe. The figure which shows a mode that the drawing-in prevention member of FIG. 5 contact | abutted to the level | step difference The figure explaining the effect | action in which the drawing-in prevention member of FIG. 5 gets over in a straight pipe | tube over a level | step difference The figure explaining the modification of an outer coil The figure explaining the attachment / detachment coupling mechanism which unites an outer coil and an inner coil integrally FIGS. 10 to 11C relate to a second embodiment of the guide tube for passing the bent tube, and FIG. 9 is a diagram for explaining the configuration of the guide tube for passing the bent tube including the centering device. The figure explaining the state which the centering device of the guide tube for bending pipe passages is located in a straight pipe, and the drawing-in prevention member penetrate | invaded in the straight pipe The figure explaining the state by which the centering device of the guide tube for bending pipe passages is arranged in the straight pipe The figure explaining the state which is inspecting the inside of a pipe using the guide tube for bending pipe passage The figure explaining the structure of the outer coil provided with the spherical member in addition to the centering device The figure explaining the effect | action of the outer coil provided with the spherical member in addition to the centering device The figure which shows the structure of the centering device provided with an oval member, and the outer coil which provided the centering device The figure explaining the relationship between the oval member arrange | positioned by the outer coil, and a pipe inner surface The figure which shows the structure of a centering device provided with a fan-shaped member, and the outer coil which provided the centering device The figure explaining the relationship between the fan-shaped member arrange | positioned by the outer coil, and a pipe inner surface

Embodiments of the present invention will be described below with reference to the drawings.
A first embodiment of a bent tube passing guide tube will be described with reference to FIGS.
As shown in FIG. 2, a bent tube passing guide tube (hereinafter abbreviated as “guide tube”) 1 includes an outer coil 2, an inner coil 3, a protruding length defining member 4, and a pull-in preventing member 5. It is configured. Reference numeral 6 denotes an insertion portion of the endoscope, which is formed in a predetermined size and smaller than the inner diameter of the inner coil 3, and can be inserted and removed without meandering in the coil.

  The outer coil 2 is a close-contact coil spring having a predetermined stretchability and rigidity, giving priority to the pushability to the pipe deep portion. The inner coil 3 is a close-contact coil spring that is more flexible than the outer coil 2 in order to improve the passage of a bent tube (hereinafter referred to as an elbow tube), and has preset stretchability and rigidity. The flexibility means that it is easier to bend and deform than the outer coil 2 when passing through the elbow pipe.

  The front end portion 3a of the inner coil 3 is configured as a coarsely wound coil portion obtained by winding so as to have a preset elasticity. That is, the distal end portion 3a which is a coarsely wound coil portion can be easily bent and stretched and deformed more easily than the densely wound portion of the inner coil 3.

  The inner coil 3 can be inserted into the outer coil 2 and is slidable with respect to the outer coil 2 as indicated by an arrow Y2. When the inner coil 3 is disposed in the outer coil 2, the distal end side of the inner coil 3 protrudes from the distal end opening of the outer coil 2 by a predetermined length or more, and the proximal end side of the inner coil 3 is the base of the outer coil 2. The length dimension is determined so as to protrude from the end opening by a predetermined length or more.

  The outer diameter of the inner coil 3 is smaller than the inner diameter of the outer coil 2 by a predetermined size. Thus, the flexible inner coil 3 can be easily pushed in without meandering in the outer coil 2.

In general, the hardness of the coil is hardened by forming with a high-hardness strand, and hardened by increasing the wire diameter. Moreover, when the material and the wire diameter of the strand are the same, it becomes hard as the number of strips increases. That is, the hardness of the outer coil 2 and the inner coil 3 is set by appropriately selecting the material of the wire, the wire diameter of the wire, and the number of strips.
In this embodiment, the outer coil 2 has an outer diameter of 12.7 mm and a strand diameter of 1.4 mm, the inner coil 3 has an outer diameter of 9.3 mm and a strand diameter of 1.0 mm, The outer diameter of the insertion portion 6 is 6.0 mm.

  The protrusion length defining member 4 is a tubular or ring-shaped member, and is slidable with respect to the outer peripheral surface of the inner coil. The projecting length defining member 4 defines the projecting length of the inner coil 3 projecting from the tip opening of the outer coil 2. The protrusion length defining member 4 is fixed to the inner coil 3 protruding from the proximal end opening of the outer coil 2 in consideration of the protrusion length. The distal end side length of the inner coil 3 is defined by the distal end surface of the protruding length defining member 4 coming into contact with the proximal end of the outer coil 2.

  The protruding length defining member 4 is fixed to the inner coil 3 by a fixing screw 7, for example. In this configuration, a screw disposition hole provided with a screw portion in which the fixing screw 7 is disposed is provided on the outer peripheral surface of the tubular portion of the protruding length defining member 4.

  The pull-in preventing member 5 is also a tubular or ring-shaped member that is substantially the same as the protruding length defining member 4. The pull-in preventing member 5 is fixed to the outer peripheral surface of the inner coil 3 by an adhesive, solder, welding or the like. The inner coil 3 is prevented from being pulled into the outer coil 2 by the base end surface of the pull-in preventing member 5 coming into contact with the distal end of the outer coil 2.

The operation of the guide tube will be described with reference to FIGS. 3A to 3C.
When the operator performs the operation of inserting the guide tube 1 of FIG. 2 into the pipe, the inner coil 3 base is taken into consideration in consideration of the inner diameter of the pipe, the height of the step near the elbow pipe, the positional relationship of the plurality of elbow pipes, and the like. The protruding length defining member 4 is fixed on the end side. Then, the operator inserts the guide tube 1 from the inlet of the pipe with the protruding length defining member 4 in contact with the proximal end of the outer coil 2. Then, as shown in FIG. 3A, the pull-in preventing member 5 provided at the distal end 3 b of the inner coil 3 constituting the forefront of the guide tube 1 enters the elbow pipe 51 constituting the pipe 50.

  And the front-end | tip part 3a of the inner coil 3 contact | abuts to the inner side curved surface 53 with an operator's insertion force amount. Then, since the front-end | tip part 3a is a coarse coil part which has elasticity, and the inner coil 3 is provided with a softness | flexibility, it will curve as shown to FIG. 3B.

  If the pull-in preventing member 5 is not in contact with the step 54 in this curved state, the inner coil 3 passes through the straight tube 52 without being caught by the step 54 as shown in FIG. 3C.

  That is, the operator is not aware that the tip 3 b of the inner coil 3 has reached the elbow pipe 51, and does not stop the insertion of the guide tube 1 in the elbow pipe 51. You can continue to insert it.

  On the other hand, when the leading end 3a of the inner coil 3 is in a curved state as shown in FIG. 4A and the pull-in preventing member 5 provided at the leading end 3b of the inner coil 3 is caught by the step 54, the guide tube 1 Insertion is stopped once. At this time, the operator operates the guide tube 1 in the following procedure, for example.

First, the operator advances the distal end 2b of the outer coil 2 as indicated by an arrow Y4A, and releases the contact state between the proximal end of the outer coil 2 and the distal end of the protruding length defining member 4.
Next, the operator performs an operation of twisting the inner coil 3 as shown by an arrow Y4B1 in FIG. 4B and an operation of moving the inner coil 3 forward as shown by an arrow Y4B2, and the step 54 of the pull-in preventing member 5 And the pull-in preventing member 5 is caused to enter the straight tube 52.

  Specifically, the operator performs a hand operation of pressing the protruding length defining member 4 against the proximal end of the outer coil 2 while performing the twisting operation of the inner coil 3. Then, the distal end portion 3a of the inner coil 3 twisted by the operator is provided with the pull-in preventing member 5 at the distal end 3b, and is provided with deformability against bending and expansion / contraction, so that the elbow pipe As shown by the broken line in 51, the catching with the stepped portion 54 is resolved. Then, the inner coil 3 is advanced and the protruding length defining member 4 comes into contact with the proximal end of the outer coil 2, so that the distal end 3 b of the coil 3 passes through the elbow pipe 51. Thereby, the operator can restart the insertion of the guide tube 1 into the pipe 50.

  Thus, the guide tube 1 is comprised by the outer coil 2 and the inner coil 3 which has the front-end | tip part 3a comprised by the rough winding coil part. The guide tube 1 is configured such that the distal end side including the distal end portion 3 a of the inner coil 3 is projected from the distal end opening of the outer coil 2 and the proximal end side of the inner coil 3 is projected from the proximal end opening of the outer coil 2. Is inserted into the pipe 50. Since the distal end portion 3a is arranged at the foremost end of the guide tube 1, the distal end portion 3a can be inserted into the elbow pipe 51 by being appropriately bent by the amount of insertion force of the operator.

  On the other hand, when the tip 3b of the curved inner coil 3 is caught by the step 54, the insertion of the guide tube 1 is temporarily stopped. 3 can be easily resumed by inserting the distal end 3b of 3 into the straight pipe 52 positioned before the elbow pipe 51.

  In the embodiment described above, the pull-in preventing member 5 is fixed to the tip of the inner coil 3. However, as shown in FIG. 5, a pull-in preventing member 5 </ b> A including a step passage member may be fixed to the tip of the inner coil 3.

  The pull-in preventing member 5A shown in FIG. 5 is preferably a soft material such as urethane resin having a predetermined hardness. The pull-in preventing member 5A includes a tubular portion 5b and a flange-shaped portion 5c.

  The tubular portion 5b is fixed to the outer peripheral surface of the inner coil 3 with an adhesive or the like. In the present embodiment, a plurality of flange-shaped portions 5c are provided in the circumferential direction. Each flange-shaped portion 5c has a thickness and a height dimension so as to have a predetermined elastic force.

The height of the flange-shaped portion 5c is set slightly larger than the step in the pipe, and the length protruding to the outer periphery of the flange-shaped portion 5c is preferably small in order to reduce the deformation amount. Thereby, resistance can also be reduced.
In addition, the structure which provides one flange provided with the predetermined elastic force instead of providing the flange-shaped part 5c in the tubular part 5b may be sufficient. Further, a pull-in preventing member 5A having a flange-shaped portion 5c may be provided on the distal end side of the outer coil 2 in the same manner.

  According to the inner coil 3 in which the pull-in preventing member 5A is fixed, the inner coil 3 is prevented from being pulled into the outer coil 2 by the base end surface of the tubular portion 5b coming into contact with the distal end of the outer coil 2.

  Further, in the inner coil 3 to which the pull-in preventing member 5A is fixed, as shown in FIG. When abutting against the inner curved surface 53 of the pipe 51, the flange-shaped portion 5c is deformed and pressed and held on the inner curved surface 53 as shown by a solid line. Thus, the operator can determine that the tip of the guide tube 1 has reached the elbow pipe 51.

  Here, the operator advances the distal end 2 b of the outer coil 2 to release the contact state between the protruding length defining member 4 and the proximal end of the outer coil 2. Next, the operator performs an operation of twisting the inner coil 3 and an operation of moving the inner coil 3 forward. Then, as described above, the distal end portion 3a of the inner coil 3 is repelled in the elbow pipe 51 and the engagement with the step 54 is eliminated, and the pull-in preventing member 5 at the distal end 3b of the coil 3 is indicated by a two-dot chain line. Intrusion into the straight pipe 52 can be resumed, and the insertion of the guide tube 1 into the pipe 50 can be resumed.

  7A, when the flange-shaped portion 5c is directed toward the step 54 as shown in FIG. 7A, the flange-shaped portion 5c is moved to the step 54 as shown in FIG. While abutting and elastically deforming, it passes through the step 54 by an elastic force to return to the original state. That is, the pull-in preventing member 5 </ b> A can enter the straight pipe 52 without being caught by the step 54, and the guide tube 1 can be inserted into the pipe 50.

  Thus, by providing the flange-shaped portion 5c having elasticity to the pull-in preventing member, the inner coil 3 and the outer coil each time the elbow pipe 51 is reached during the operation of inserting the guide tube 1 into the pipe 50. 2 to perform the operation of twisting and the operation of moving forward, making it easy to pass through the elbow pipe 51, and the guide tube 1 can be reliably inserted into the deep portion.

A modification of the outer coil will be described with reference to FIG.
The outer coil 2 </ b> A shown in FIG. 8 is provided with a distal end portion 2 c constituted by a coarsely wound coil portion obtained by winding so as to have elasticity set in advance on the distal end side, like the inner coil 3.

  According to this configuration, when the tip 2b of the outer coil 2A is caught by the step 54 and the insertion of the guide tube 1 is stopped, the operator performs the twisting operation of the outer coil 2A in the same manner as the hand operation of the inner coil 3. , Perform the hand operation to move forward.

Then, when the outer coil 2A is twisted, the distal end portion 2c moves within the elbow pipe 51 to eliminate the catch with the step 54, and the insertion of the guide tube 1 into the pipe 50 is resumed. Can do.
In this way, if the hardness of the outer coil 2A is the same throughout the entire length, the passability of the elbow pipe 51 may be deteriorated. Therefore, in order to prevent this problem, the distal end side has elasticity. Is effective.

  In addition, when the tip of the outer coil 2 is caught by the elbow pipe 51, the tip of the outer coil 2 hits the step and can pass through the elbow pipe 51 by operating by combining the pushing operation and the twisting operation. .

  Further, as shown in FIG. 9, the protruding length defining member 4 is provided with a convex portion 4 a, a base 10 is provided on the proximal end opening side of the outer coil 2, and a concave portion 10 a in which the convex portion 4 a is engaged with the inner surface side of the base 10. Is provided. Then, the outer coil 2 and the inner coil 3 may be prevented from rotating during insertion of the guide tube 1 by engaging the convex portion 4 a of the protruding length defining member 4 into the concave portion 10 a of the base 10.

Furthermore, a holding member may be provided on the distal end side of the outer coil 2 so that the outer coil 2 and the inner coil 3 are fixed and held together. The holding member is composed of a base provided at the tip of the outer coil 2, a stop ring, and a rubber material disposed therebetween, and the outer periphery of the inner coil 3 is compressed and deformed by tightening the stop ring. Press and fix the surface.
The retaining ring is provided with a retaining screw so that the retaining ring can be fixed so as not to rotate.

A second embodiment of the guide tube will be described with reference to FIGS. 10 to 11C.
As shown in FIG. 10, the guide tube 1 </ b> A of the present embodiment includes an outer coil 2, an inner coil 3, a protruding length defining member 4, a pull-in preventing member 5, and a centering device 9. .

  The centering device 9 is fixed to the distal end side of the outer coil 2. The centering device 9 is made of, for example, a metal such as stainless steel in consideration of slidability and corrosivity, and is made of a resin such as fluororesin, polyacetal, nylon, etc. in consideration of slidability and lightness, and has a spherical portion 9a. .

  The centering device 9 is fixed to the outer peripheral surface of the outer coil 2 by a fixing screw (not shown) disposed in a screw disposing hole 9b having a threaded portion provided in a spherical portion.

  The spherical portion 9a brings the central axis of the outer coil 2 close to the central axis of the pipe in a state where it is arranged in the pipe. Therefore, the outer diameter dimension of the spherical portion 9a is set to be a predetermined dimension smaller than the inner diameter dimension of the pipe in consideration of the inspection performance when inspecting the inside of the pipe and the insertability into the deep part of the pipe. Yes.

  Other configurations are the same as those of the first embodiment described above, and the same members are denoted by the same reference numerals and description thereof is omitted.

The operation of the guide tube 1A will be described with reference to FIGS. 11A to 11C.
When the operator performs the operation of inserting the guide tube 1A into the pipe, the centering device 9 including the spherical portion 9a having the optimum outer diameter is fixed to the distal end side of the outer coil 2 in consideration of the inner diameter of the pipe. . The spherical portion 9a may be fixed so as to slightly protrude from the tip of the outer coil 2.

  The worker inserts the guide tube 1A toward the deep part of the piping as described above. When the guide tube 1 is inserted into the straight tube 52, a part of the outer surface of the spherical portion 9a constituting the centering device 9 fixed to the tip of the outer coil 2 is in contact with the inner surface of the straight tube 52. Go deeper.

  When the pull-in preventing member 5 provided at the distal end 3b of the inner coil 3 of the guide tube 1A is arranged in the elbow pipe 51 constituting the pipe 50, the operator performs the above-described hand operation to perform FIG. As shown in FIG. 3, the pull-in preventing member 5 of the inner coil 3 is caused to enter the straight tube 52.

  Next, the operator continues the pushing operation of the guide tube 1A and inserts the centering device 9 fixed to the tip of the outer coil 2 into the elbow pipe 51, and then passes through the elbow pipe 51 and straightens it. Located within the tube 52.

  Next, the operator continues the push-in operation of the guide tube 1A and causes the leading end of the guide tube 1A to reach the target site in the deep part as shown in FIG. 11B. Here, in order to perform endoscopic observation, the operator first pulls back the inner coil 3 and brings it into contact with the distal end of the outer coil 2 so that the proximal end surface of the pull-in preventing member 5 is indicated by a broken line. As a result, the distal end portion 3 a is accommodated in the outer coil 2.

  Next, the operator inserts the insertion portion 6 of the endoscope into the inner coil 3 from the proximal end opening of the inner coil 3. Then, as shown in FIG. 11C, the insertion portion 6 is led out from the tip 3 b of the inner coil 3 into the straight tube 52.

  If the operator confirms that the insertion portion 6 is led out into the straight tube 52 by an endoscopic image displayed on a screen of a display device (not shown), the inspection in the tube is started. That is, the worker starts a pull-in operation for pulling the outer coil 2 in the direction of the arrow Y10c1. Then, a state where a part of the spherical portion 9a of the centering device 9 provided at the distal end portion of the outer coil 2 is in contact with the inner surface of the tube, the outer coil 2 and the insertion portion 6 are integrally retracted as indicated by an arrow Y10c2. To go. As a result, an endoscopic image in the observation range indicated by the arrow Y10c3 of the observation optical system of the endoscope, that is, an endoscopic image capturing the entire circumference of the tube, is displayed on the screen of the display device being observed by the operator. Is displayed.

  As described above, by disposing the centering device 9 on the distal end side of the outer coil 2, the central axis of the outer coil 2 is brought close to the central axis of the straight pipe 52 constituting the pipe 50 and protrudes from the inner coil 3. The endoscope can be brought close to the central axis of the straight tube 52. Thus, by moving the endoscope together with the outer coil 2, it is possible to observe the entire circumference of the tube by a single pull-back operation.

  As shown in FIG. 12, a first spherical member 9C smaller than the diameter of the spherical portion 9a and the first spherical member 9C are provided on the outer peripheral surface of the outer coil 2 on the proximal side of the centering device 9 having the spherical portion 9a. The outer spherical coil 2 may be configured by providing the second spherical member 9D having a diameter smaller than that of the spherical member 9C and 9D in this order.

As a result, the angle θ between the longitudinal axis of the outer coil 2 extending to the base end side of the spherical portion 9a and the tube bottom surface 52a is gently inclined, and the amount of pushing force of the operator is efficiently increased. The guide tube 1A provided with the centering device 9 is transmitted to the distal end side so that the insertion property into the deep portion can be improved.
The centering device 9 of this figure is provided with a tube portion 9a1, and the tube portion 9a1 is provided with a screw disposing hole 9s1 for disposing a fixing screw 9s.

  12 and 13 show a configuration in which two spherical members 9C and 9D are arranged on the base end side of the spherical portion 9a of the outer coil 2. FIG. However, the number of spherical members arranged in the outer coil 2 may be less or more in consideration of the diameter and length of the tube to be inspected.

  Further, the centering device 9 of the above-described embodiment is configured to include the spherical portion 9a. However, the centering device 9 is not limited to this, and may be, for example, the centering devices 9E and 9F shown in FIGS. 14A and 15A.

  A centering device 9E shown in FIG. 14A is composed of an oval member 9g. In the present embodiment, two centering devices 9E are arranged with the attachment angle changed by 90 degrees, for example, one at the foremost end of the outer coil 2 and its proximal end side.

  As a result, when the two centering devices 9E are arranged in the straight tube 52, the top portion 9ga of the oval member 9g is arranged on the inner surface of the tube as shown in FIG. Can be brought close to the central axis of the straight tube 52 constituting the pipe 50, and the endoscope protruding from the inner coil 3 can be brought close to the central axis of the straight tube 52.

  On the other hand, the centering device 9F includes a sector-shaped member 9h as shown in FIG. 15A. In the present embodiment, three centering devices 9F are disposed at the most distal end of the outer coil 2 and at the base end side thereof, and the mounting angles are changed by 120 degrees.

  As a result, when the three centering devices 9F are arranged in the straight tube 52, as shown in FIG. 15B, a part of the peripheral portion 9ha of the fan-shaped member 9g comes into contact with the inner surface of the tube, and the outer coil as described above. The center axis of 2 is brought close to the center axis of the straight tube 52 constituting the pipe 50, and the endoscope protruding from the inner coil 3 can be brought close to the center axis of the straight tube 52.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1, 1A ... Elbow passage guide tube 2, 2A ... Outer coil 2b ... Tip 2c ... Tip 3 ... Inner coil 3a ... Tip 3b ... Tip 4 ... Projection length regulating member 5, 5A ... Retraction prevention member 5b ... Tubular part 5c ... Flange shape part 6 ... Insertion part 7 ... Fixing screw 9, 9E, 9F ... Centering device
9C, 9D ... spherical member 9a ... spherical portion 9b ... screw arrangement hole 9g ... oval member 9g ... fan-shaped member 9ga ... top 9h ... fan-shaped member 9ha ... peripheral portion 10 ... fixing screw 50 ... pipe 51 ... bent tube ( (Elbow pipe) 52 ... Straight pipe 52a ... Bottom of pipe 53 ... Inside curved surface 54 ... Step 100 ... Piping
101 ... Elbow tube 102 ... Straight tube 103 ... Step 104 ... Coil

Claims (8)

An outer coil composed of a close coil spring;
The distal end portion and the proximal end side that can be inserted into the outer coil and are slidable with respect to the outer coil protrude from the respective end openings of the outer coil, and the insertion portion of the endoscope can be inserted. An inner coil composed of a close coil spring provided with a coarsely wound coil portion,
The inner coil is slidable with respect to the outer peripheral surface of the inner coil, is fixed to the inner coil protruding from the outer coil base end opening, abuts on the outer coil base end, and from the outer coil distal end opening of the inner coil. a projection length defining member defining a projection length,
A pull-in preventing member that prevents the inner coil from being pulled into the outer coil by abutting the proximal end surface of the outer coil on the outer peripheral surface of the coarsely wound coil portion of the inner coil; ,
The pull-in preventing member is provided at one end of the tubular portion, has an elastic force, and is a flange-shaped portion protruding in a predetermined dimension from the outer peripheral surface of the tubular portion,
A plurality of the flange-shaped portions are provided in the circumferential direction of the tubular portion .   The guide tube for passing a bent pipe according to claim 1, wherein a distal end portion of the outer coil is a coarsely wound coil portion.   2. The guide tube for passing a bent pipe according to claim 1, wherein a centering device is provided on an outer peripheral surface on a base end side with respect to a distal end surface of the outer coil. The guide tube for passing a bent pipe according to claim 3 , wherein the centering device is spherical. 5. The guide for passing a bent pipe according to claim 4 , wherein at least one spherical member having a diameter smaller than that of the spherical centering device is provided on an outer peripheral surface of the outer coil closer to the base end side than the spherical centering device. tube. 6. The configuration according to claim 5 , wherein in the configuration in which a plurality of the spherical members are provided, the spherical member has a smaller diameter dimension of the spherical member located on the proximal end side than the spherical member located on the distal end side. The centering device, the are arranged in the outer circumferential surface of the outer coil is constituted by Rousset printer ring device component, said centering device component is bent pipe passage according to claim 3, characterized in Rukoto are arrayed Guide tube.   The bent tube passing guide tube according to claim 1, wherein the pull-in preventing member is formed of a soft material having a predetermined hardness.

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