JP5276998B2 - Endoscope insertion aid - Google Patents

Description

The present invention is an endoscope insertion assistant again and again relates with the guide tube.

  As is well known, the endoscope apparatus is widely used in the medical field and the industrial field. Endoscopic devices used in the industrial field are used to observe wounds, corrosion, etc. at a site to be examined by inserting the elongated insertion portion of the endoscope into a jet engine or a subject such as a factory pipe. Various treatments can be performed.

  An industrial endoscope apparatus is connected to an endoscope having an elongated insertion portion in which an imaging unit having an imaging element such as an imaging lens or a CCD is disposed in a hard tip portion, for example. Generally, it is constituted by a device main body. In addition, in a small-sized endoscope apparatus, what has light sources, such as LED, arrange | positioned at the front-end | tip part of an insertion part is also known.

  Also, in the apparatus main body, various members that drive the endoscope, specifically, an electric circuit that drives the imaging unit and the light source, and image processing that processes the image signal after imaging output from the imaging unit A unit, a recording medium for recording image data processed by the image processing unit, a battery for supplying power to the endoscope and the apparatus main body, and the like are provided. Further, the apparatus main body is provided with a monitor that displays an observation image after imaging (hereinafter referred to as an endoscopic image).

  By the way, in observation using an industrial endoscope apparatus, when observing a narrow and complicated part in a subject, for example, the endoscope is viewed from the port formed on the outer surface of the engine. When an insertion part of a mirror is inserted to observe the inside of the engine, the imaging lens is normally bent by bending a bending part provided on the proximal side from the distal end part on the distal end side of the insertion part inserted into the engine. Observe various parts in the engine by changing the observation direction. However, since a plurality of parts are arranged in the engine, it may be difficult to bend the bending portion, and as a result, there is a test site that is difficult to observe.

  In view of such circumstances, first, a guide tube, which is an endoscope insertion aid, is inserted into the subject through the inspection hole on the outer surface of the subject to the subject site in the subject, and then inserted into the guide tube. A method of guiding the distal end side of the insertion portion of the endoscope to a test site by a guide tube by inserting the insertion portion of the endoscope is well known. Further, a guide tube having a bent tip side in order to correspond to various test sites in the test subject is well known and disclosed in Patent Documents 1 and 2.

When using a guide tube configured by bending the distal end side disclosed in Patent Documents 1 and 2, first, a linear mandrel is inserted into the guide tube, and the distal end side of the guide tube is elastically deformed linearly. In this state, the guide tube is inserted into the subject through the inspection hole on the outer surface of the subject, and after insertion, the mandrel is removed from the guide tube. As a result, in the subject, the distal end side of the guide tube is positioned in a bent shape before elastic deformation as the mandrel is removed. Finally, the insertion portion of the endoscope is inserted into the guide tube, and the test site is observed by being advanced to the test site. According to such a method, a guide tube having a bent distal end which is difficult to insert into the subject can be easily inserted into the subject.
JP 2008-48946 A JP 2008-40001 A

  Here, depending on the test site in the subject, for example, when observing the test site located in the vicinity of the test hole in the test subject, it is necessary to use a guide tube formed by sharply bending the tip side. Arise.

  However, in such a case, using the methods disclosed in Patent Documents 1 and 2, it is possible to insert a guide tube whose tip side is abruptly bent into the subject, but the endoscope insertion portion is hard. Depending on the rigid length of the distal end in the insertion direction, there is a problem that the distal end of the endoscope insertion portion cannot pass through a rapidly bent portion in the guide tube.

  Therefore, conventionally, the guide tube is formed by limiting the curvature of the distal end side of the guide tube to a curvature that allows the distal end portion of the endoscope insertion portion to pass through. In some cases, the endoscope insertion part could not be guided to the examination site. That is, it may be difficult to insert the endoscope up to the site to be examined.

  Also, it is well known that the inner diameter of the guide tube is larger than the outer diameter of the endoscope insertion portion so that the endoscope insertion portion can pass even if the distal end side of the guide tube is bent sharply. However, in this case, since the outer diameter of the guide tube becomes large, the guide tube cannot be inserted into the hole of the subject having a diameter larger than the outer diameter of the insertion portion and smaller than the outer diameter of the guide tube. There was a problem.

  Furthermore, when the subject is located in another member, for example, the diameter of each inspection hole through the inspection hole respectively formed in the engine and the protective cover with respect to the engine located in the protective cover When the endoscope is inserted through a guide tube having substantially the same outer diameter as that of the engine, the engine is displaced with respect to the protective cover, that is, the position of the inspection hole of the protective cover with respect to the inspection hole of the engine. If it is slightly deviated, the guide tube into which the mandrel disclosed in Patent Documents 1 and 2 comes into contact with the exterior of the engine in the protective cover and cannot be inserted into the engine from the engine inspection hole. There was also a problem. This also applies to the case where the inspection hole of the engine is inclined with respect to the inspection hole of the protective cover.

The present invention has been made in view of the above-described problems. An endoscope that improves the observability of an endoscope by being able to reliably guide an endoscope insertion portion to a test site in a subject. An object is to provide a mirror insertion aid.

In order to achieve the above object, an endoscope insertion assisting tool according to the present invention includes an endoscope insertion portion inserted into the endoscope, wherein a bending shape portion is formed on the distal end side by bending the distal end side in the insertion direction. A guide tube that guides to the test site, and an outer periphery of the guide tube that is movable in the insertion direction with respect to the guide tube, and when the bent shape portion is covered, A pipe member that is elastically deformed linearly along the insertion direction, and the bent shape portion is elastically deformed before the elastic deformation when the pipe member is moved away from the bent shape portion. Returning to the bent shape, a first screw portion is formed on at least a part of the outer periphery of the pipe member along the insertion direction, and the first screw portion is threaded on the outer periphery of the pipe member. Freely Die having a second threaded portion is provided retractably in the insertion direction by screwing.

According to the present invention, by being able to induce the endoscope insertion portion securely to the measurement site in the subject, it is possible to provide an endoscope insertion aid to improve the observation of the endoscope .

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view of an endoscope apparatus including an endoscope in which an endoscope insertion assisting tool according to the present embodiment is mounted on the outer periphery of an insertion portion, and FIG. 2 is II-II in FIG. It is sectional drawing of the endoscope insertion auxiliary tool along a line.

  As shown in FIG. 1, an endoscope apparatus 100 is mounted on the outer periphery of an endoscope 1, an apparatus main body 10 connected to the endoscope 1, and an insertion portion 2 described later of the endoscope 1. The endoscope insertion assisting tool 40 constitutes a main part.

  The endoscope 1 includes an elongated and flexible insertion portion 2, an operation portion 3 connected to a rear end side (hereinafter simply referred to as a rear end side) of the insertion portion 2 in the insertion direction S, A main part is constituted by the flexible universal cord 4 extended from the operation part 3.

  In order from the distal end side in the insertion direction S of the insertion portion 2 (hereinafter simply referred to as the distal end side) to the insertion portion 2 by bending operation of the rigid distal end portion 2s and the bending operation lever 3s of the operation portion 3, for example, up and down / A curved portion 2w that is curved in the left-right direction and a long flexible tube portion 2k formed of a flexible member are connected to each other, and the rear end portion of the flexible tube portion 2k is the operation portion 3. It is connected to the.

  An imaging lens 6 as an observation optical system is provided on the distal end surface of the distal end portion 2s, and an imaging unit having an imaging element such as a CCD and a light source such as an LED are provided in the distal end portion 2s.

  Further, a bending operation lever 3s for bending the bending portion 2w is arranged on the operation portion 3 so as to be tiltable in at least four directions.

  The bending operation lever 3s is inserted into the bending portion 2w in any one of four directions, up and down / left and right, for example, into the insertion portion 2 by changing the tilting direction by the operator, for example, a bending operation (not shown). A bending operation is performed via a wire.

  In addition to the bending operation lever 3s, the operation unit 3 is provided with various switches (not shown) for instructing various imaging operations in the above-described imaging device provided in the distal end 2s, for example.

  The apparatus main body 10 to which the end of the universal cord 4 extending from the operation unit 3 is connected has, for example, a box shape, and an electrical component such as a CPU for image processing is covered inside the exterior casing. (Not shown) and a battery unit (not shown) for supplying power to the LEDs described above are arranged.

  In addition, a monitor 11 that displays an endoscope image captured by the imaging element of the endoscope 1 is fixed to the exterior casing of the apparatus body 10 so as to be openable and closable with respect to the exterior casing. The monitor 11 may be detachable from the exterior housing.

  As shown in FIGS. 1 and 2, the endoscope insertion assisting tool 40 has an insertion portion 2 of the endoscope 1 inserted therein, in which a bending shape portion 20 m is formed on the distal end side by bending the distal end side. A guide tube 20 formed of a resin having an elastic force, for example, urethane resin, for guiding the sample to the test site of the subject, and the guide tube 20 coated on the outer periphery of the guide tube 20 in the insertion direction S. As shown in FIG. 3 to be described later, when the bent shape portion 20m is covered, the main portion is constituted by the pipe member 30 that elastically deforms the bent shape portion 20m in a straight line along the insertion direction S. ing. The bent shape portion 20m is formed to return to a bent shape before elastic deformation by elastic force when the pipe member 30 is moved to the rear end side along the insertion direction S so as to be separated from the bent shape portion 20m. Has been.

  Further, the endoscope insertion aid 40 can be attached to the insertion portion 2 of the endoscope 1 simply by inserting the insertion portion 2 of the endoscope 1 into the guide tube 20 of the endoscope insertion aid 40. At the same time, the endoscope insertion assisting tool 40 can be detached from the insertion portion 2 simply by removing the insertion portion 2 from the inside of the guide tube 20. That is, the endoscope insertion aid 40 is detachable from the insertion portion 2.

  On the rear end side of the guide tube 20, a guide tube handle 21 that is gripped by an operator is formed. The guide tube handle 21 may be formed integrally with the guide tube 20 or may be formed separately and attached to the guide tube 20.

  The guide tube handle 21 is used when the grasped operator pushes the guide tube 20 into the subject, and is rotated by the grasped operator so that the guide tube handle 21 is moved toward the distal end side of the guide tube 20 in the subject. It is used when the formed bent shape portion 20m is rotated to change the guide direction of the insertion portion 2.

  The pipe member 30 is made of, for example, stainless steel, and, as shown in FIG. 2, at least a part along the insertion direction S of the outer peripheral surface 30 g, for example, a male screw portion that is a first screw portion on the rear end side. 30n is formed. The male screw portion 30n may be formed on the outer peripheral surface 30g over the entire length along the insertion direction S of the pipe member 30.

  A base 31 having a female screw portion 31n, which is a second screw portion that can be screwed to the male screw portion 30n, is inserted into the outer peripheral surface 30g of the pipe member 30 by screwing the female screw portion 31n to the male screw portion 30n. S is provided so as to freely advance and retract. That is, when the base 31 is rotated, the base 31 is advanced and retracted in the insertion direction S by the threaded engagement of the female screw portion 31n with the male screw portion 30n.

  In addition, since the base 31 is detachable from the outer peripheral surface 30g of the pipe member 30, it has a configuration that can be attached to the outer peripheral surface 30g of another pipe member 30 having a different length in the insertion direction S. . That is, various pipe members 30 having different lengths in the insertion direction S can be attached to the outer periphery of the insertion portion 2.

  Furthermore, the distal end surface 31s of the base 31 is brought into contact with the exterior of the subject when the guide tube 20 having the insertion portion 2 inserted therein is inserted into the subject site through the hole of the subject. The part which positions in the insertion direction S of the pipe member 30 with respect to a to-be-tested part is comprised.

  Therefore, when the pipe member 30 is inserted into the interior 60i of the subject 60 as shown in FIG. 5 described later, the tip 31 can move forward and backward in the insertion direction S with respect to the outer peripheral surface 30g of the pipe member 30. When the surface 31s contacts the exterior 60g of the subject 60, the insertion length of the pipe member 30 into the interior 60i can be varied.

  The base 31 is provided with a pipe member handle 32. The pipe member handle 32 is used when the grasped operator pushes the pipe member 30 into the subject and is used when the pipe member 30 is advanced and retracted in the insertion direction S with respect to the outer periphery of the guide tube 20. It is.

  Next, the effect | action of this Embodiment is demonstrated using FIGS. FIG. 3 is a cross-sectional view of the endoscope insertion aid showing a state in which the pipe member of FIG. 2 has been moved to the distal end side until it covers the bent shape portion of the guide tube, and FIG. FIG. 5 is a partial cross-sectional view showing a state where the endoscope insertion portion is inserted, and FIG. 5 shows that the tip of the pipe member of FIG. 4 inserted into the second member comes into contact with the base of the first member. FIG. 5 is a partial cross-sectional view showing a state in which only a guide tube having an endoscope insertion portion inserted therein is inserted into a first member.

  6 is a partial cross-sectional view showing a state in which the guide tube of FIG. 5 into which the endoscope insertion portion is inserted protrudes toward the distal end side in the first member, and FIG. It is a fragmentary sectional view showing the state where the endoscope insertion part protrudes from the tip of the guide tube, the curved part of the protruded endoscope insertion part is curved, and the imaging lens faces the region to be examined.

  As shown in FIG. 5, for example, an endoscope is provided in an interior 50 i of a tank 50 that constitutes a first member that is a subject provided in an interior 60 i of a case 60 that constitutes a second member that is a subject. When inserting the first insertion portion 2 and observing the test site 80 in the vicinity of the base 51, for example, in the inside 50i of the tank 50, first, the operator first operates the guide tube handle 21 and the pipe member handle shown in FIG. 32, the pipe member 30 is moved to the distal end side so as to cover the bent shape portion 20m of the guide tube 20, and the bent shape portion 20m is linear along the insertion direction S as shown in FIG. The first step of elastically deforming is performed.

  Next, the operator inserts the insertion portion 2 of the endoscope 1 into the guide tube 20 shown in FIG. 3 from the rear end side, and the tip of the insertion portion 2 is the tip of the guide tube 20 as shown in FIG. The second step of inserting until it is positioned at or until it protrudes from the tip of the guide tube 20 is performed.

  Next, the operator holds the guide tube 20 having the bent portion 20m covered with the pipe member 30 and the guide tube handle 21 and the pipe member handle 32 while the insertion portion 2 is inserted into the inside shown in FIG. As shown in FIG. 5, the first end 30s of the pipe member 30 is positioned substantially coaxially with the hole 60k of the tank 50 from the hole 60k of the case 60, which is the second hole, to the inside 60i of the case 60. A third step of inserting the guide tube 20 into the base 51 is performed until the base 51 is in contact with the outer periphery of the exterior 50 g of the base 51. At this time, the tip end surface 31 s of the base 31 of the pipe member 30 is in contact with the exterior 60 g of the case 60, thereby positioning the pipe member 30 with respect to the test site 80. Incidentally, the contact of the tip surface 31s of the base 31 with the exterior 60g is such that when the tip 30s of the pipe member 30 contacts the base 51, the base 31 is rotated by rotating the base 31 as shown in FIG. This is done by advancing and retracting in the insertion direction S.

  Next, the operator grasps the guide tube handle 21 in a state where the tip 30 s of the pipe member 30 shown in FIG. 5 is in contact with the outer periphery of the base 51 of the tank 50 and inserts the insertion portion 2 into the pipe member 30. 6 is pushed forward in the insertion direction S in the interior 50i of the tank 50, thereby inserting the bent shape portion 20m of the guide tube 20 in the interior 50i of the tank 50 as shown in FIG. Together with the part 2, the fourth step of making the bent shape before elastic deformation is performed.

  Finally, the operator grasps the insertion portion 2 from the state shown in FIG. 6 and pushes the insertion portion 2 forward in the insertion direction S with respect to the guide tube 20, as shown in FIG. An imaging lens provided at the distal end portion 2s by causing the bending portion 2w and the distal end portion 2s of the insertion portion 2 to protrude from the distal end of the tube 20 and bending the bending portion 2w by operating the bending operation lever 3s of the operation portion 3. A fifth step of observing the test site 80 is performed with 6 facing the test site 80.

  When removing the insertion portion 2 from the inside 50i of the tank 50 and the inside 60i of the case 60, first, only the insertion portion 2 is pulled out of the case 60 using the guide tube 20 as a guide, or the guide tube handle 21 is grasped. Then, after the insertion portion 2 is pulled out from the base 51 together with the guide tube 20 into the interior 60i of the case 60, the bent portion 20m is elastically deformed linearly by the pipe member 30 in the interior 60i as shown in FIG. A method of pulling the insertion portion 2 together with the pipe member 30 and the guide tube 20 out of the case 60 from the hole 60k is conceivable.

  Thus, in this embodiment, the outer periphery of the guide tube 20 can be moved forward and backward in the insertion direction S with respect to the guide tube 20, and when the bent shape portion 20m is covered, the bent shape portion 20m is inserted in the insertion direction S. It is shown that the pipe member 30 that is elastically deformed in a straight line along the line is covered.

  According to this, in the state where the bent shape portion 20m is elastically deformed linearly by the pipe member 30, the insertion portion 2 of the endoscope 1 inserted to the distal end side of the guide tube 20 is inserted into the subject. By inserting the guide tube 20 from the tip 30 s of the pipe member 30 in the subject, the insertion portion 2 that has passed through the bent shape portion 20 m of the guide tube 20 can be inserted from the tip of the guide tube 20. Since it can project, the endoscope insertion assisting tool 40 having a configuration in which the insertion portion 2 can pass through the guide tube 20 even when the curvature of the bent shape portion 20m of the guide tube 20 is large. Can be provided.

  Even if the hole 60k of the case 60 and the base 51 of the tank 50 are slightly misaligned, the guide tube is placed in the base 51 with the tip 30s of the pipe member 30 in contact with the outer periphery of the base 51. Since 20 can be inserted, the insertion part 2 can be easily inserted into the inside 50 i of the tank 50.

  Furthermore, since the guide tube 20 can be inserted into the subject while the endoscope 1 is attached, the guide tube 20 can be inserted while looking at the portion to be inserted, so that the insertion can be performed accurately. It is possible to prevent the endoscope tip from being hit and broken.

From the above, it is possible to provide the endoscope insertion assisting tool 40 that improves the observability of the endoscope 1 by being able to reliably guide the endoscope insertion portion 2 to the test site in the subject. it can.

  In the present embodiment, when the tank 50 is provided in the interior 60 i of the case 60, that is, when the tank 50 is covered with the case 60, an endoscope is inserted into the interior 50 i of the tank 50. Although the case where the insertion part 2 is inserted using the assisting tool 40 has been described as an example, the present invention is not limited thereto, and the endoscope insertion assisting tool 40 is used in the inside 50i of the tank 50 that is not covered by the case 60. Thus, the same effect can be obtained when the insertion portion 2 is inserted.

  Further, although the tank 50 and the case 60 are shown as examples of the subject, it is needless to say that the subject is not limited to the above. Furthermore, the configuration and method of the present embodiment can be applied to the test site 80 as long as the test site 80 is not limited to the vicinity of the base in the subject but is located in a direction inclined from the axis passing through the base 51. it can.

(Second Embodiment)
FIG. 8 is a partial perspective view showing the guide tube of the endoscope insertion aid showing the present embodiment.

  The configuration of the endoscope insertion aid of the second embodiment is closer to the distal end side of the guide tube than the endoscope insertion aid of the first embodiment shown in FIGS. The formed bending shape part is comprised from the some bending part, and the points by which the slit is formed inside the bending direction of each bending part differ. Therefore, only this difference will be described, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted.

  As shown in FIG. 8, the guide tube 120 of the endoscope insertion assisting tool in the present embodiment is formed with a bent shape portion 120 m composed of a plurality of bent portions 121 and 122 on the distal end side in the insertion direction S. ing. In addition, the some bending part which comprises the bending shape part 120m is not limited to two places.

  In addition, a slit 125 is formed on the inner side 120 f of each bending portion 121 in the bending direction M. Other configurations are the same as those in the first embodiment described above.

  According to such a configuration, since the slits 125 are formed in the bent portions 121 and 122, respectively, the curvature of the bent shape portion 120m can be made larger than that in the first embodiment. Therefore, by using it in combination with the pipe member 30 shown in the first embodiment, the insertion section 2 can be inserted together with the guide tube 120 into a more complicated portion in the subject.

  Furthermore, when the guide tube 120 is pushed out from the distal end 30s of the pipe member 30, the bent shape portion 120m is easily deformed by the slit 125, so that the guide tube 120 can be pushed out more smoothly. For the same reason, the guide tube 120 can be pulled out more smoothly.

  Further, when used in combination with the pipe member 30, it is possible to prevent expansion of the guide tube tip side when the insertion portion 2 passes through the guide tube.

(Third embodiment)
FIG. 9 is a partial perspective view showing the guide tube of the endoscope insertion aid showing the present embodiment.

  The configuration of the endoscope insertion assisting tool of the third embodiment is such that the guide tube is from the distal end side as compared with the endoscope insertion assisting tool of the first embodiment shown in FIGS. The outer diameter becomes larger toward the rear end side, and the difference is that a linear slit is formed inside the bending direction of the bent portion. Therefore, only this difference will be described, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted.

  As shown in FIG. 9, the guide tube 220 of the endoscope insertion aid in the present embodiment is formed so that the outer diameter increases from the front end side in the insertion direction S toward the rear end side. (D1 <D2 <D3 <D4). The outer diameter D4 is substantially equal to the outer diameter of the insertion portion 2.

  A linear slit 225 is formed along the insertion direction S on the inner side 220f in the bending direction M of the bent portion 220m formed on the distal end side of the guide tube 220. Other configurations are the same as those in the first embodiment described above.

  According to such a configuration, since the linear slit 225 is formed in the bent shape portion 220m, the curvature of the bent shape portion 220m can be made larger than that in the first embodiment. Therefore, by using it in combination with the pipe member 30 shown in the first embodiment, the insertion portion 2 can be inserted together with the guide tube 220 into a more complicated portion in the subject.

  Further, since the outer diameter of the distal end side of the guide tube 220 is expanded as the insertion portion 2 passes and the slit width of the linear slit 225 is expanded, the guide tube 20 is placed in the subject. When inserted, the slit 225 is not caught by a member arranged in the subject.

  Furthermore, when the guide tube is pushed out from the distal end 30s of the pipe member 30, the bent shape portion 220m is easily deformed by the slit 225, so that the guide tube 220 can be pushed out more smoothly. For the same reason, the guide tube 220 can be pulled out more smoothly.

  Further, when used in combination with the pipe member 30, it is possible to prevent expansion of the guide tube tip side when the insertion portion 2 passes through the guide tube.

  Hereinafter, a modification will be described with reference to FIG. FIG. 10 is a partial perspective view of the guide tube showing a modification in which the slit width of the slit formed in the guide tube becomes smaller as it goes from the front end side toward the rear end side.

  As shown in FIG. 10, even if the outer diameter of the guide tube 320 is substantially the same regardless of the part (d1≈d2≈d3≈d4), the slit 325 formed on the inner side 320f in the bending direction M of the bent shape portion 320m is formed. If the slit width is formed so as to decrease from the front end side toward the rear end side, the same effect as that of the above-described third embodiment shown in FIG. 9 can be obtained.

The perspective view of the endoscope apparatus which comprises the endoscope with which the endoscope insertion auxiliary tool which shows 1st Embodiment was mounted | worn on the outer periphery of the insertion part. Sectional drawing of the endoscope insertion auxiliary tool which follows the II-II line in FIG. Sectional drawing of the endoscope insertion auxiliary tool which shows the state moved to the front end side until the pipe member of FIG. 2 coat | covers the bending shape part of a guide tube. FIG. 4 is a partial cross-sectional view showing a state where an endoscope insertion portion is inserted into the guide tube of FIG. 3. The tip of the pipe member of FIG. 4 inserted into the second member is brought into contact with the base of the first member, and only the guide tube having the endoscope insertion portion inserted therein is inserted into the first member. The fragmentary sectional view which shows the state made. FIG. 6 is a partial cross-sectional view showing a state in which the guide tube of FIG. 5 into which the endoscope insertion portion is inserted protrudes toward the distal end side in the first member. FIG. 7 is a partial cross-sectional view showing a state in which an endoscope insertion portion protrudes from the distal end of the guide tube in FIG. 6, a bending portion of the protruded endoscope insertion portion is bent, and an imaging lens faces a region to be examined. The fragmentary perspective view which shows the guide tube of the endoscope insertion auxiliary tool which shows 2nd Embodiment. The fragmentary perspective view which shows the guide tube of the endoscope insertion auxiliary tool which shows 3rd Embodiment. The fragmentary perspective view of the guide tube which shows the modification from which the slit width of the slit formed in the guide tube becomes small as it goes to the rear end side from the front end side.

2 ... endoscope insertion part 6 ... imaging lens (observation optical system)
20 ... Guide tube 20m ... Bending shape part 30 ... Pipe member 30g ... Outer peripheral surface (outer periphery) of pipe member
30n ... female screw part (first screw part)
31 ... Base 31n ... Male thread (second thread)
40 ... endoscope insertion aid 50 ... tank (subject) (first member)
50g ... tank exterior 51 ... base (hole) (first hole)
60 ... Case (subject) (second member)
60g ... tank exterior 60k ... hole (second hole)
80 ... Test site 120 ... Guide tube 120f ... Inner side 120m ... Bent part 121 ... Bend part 122 ... Bend part 125 ... Slit 220 ... Guide tube 220f ... Inner side 220m ... Bent part 225 ... Linear slit 320 ... Guide tube 320f ... Inside 320m ... Bending shape part 325 ... Slit D1-D4 ... Outer diameter of guide tube M ... Bending direction S ... Insertion direction

Claims (5)

A guide tube that guides the endoscope insertion portion inserted into the test site, wherein a bending-shaped portion is formed on the distal end side by bending the distal end side in the insertion direction;
The guide tube covered on the outer periphery of the guide tube is movable in the insertion direction with respect to the guide tube, and when the bent shape portion is covered, the bent shape portion is elastically deformed linearly along the insertion direction. comprising a pipe member for a,
When the pipe member is moved away from the bent shape portion, the bent shape portion returns to a bent shape before elastic deformation by elastic force,
A first screw portion is formed on at least a part of the outer periphery of the pipe member along the insertion direction;
An internal view, wherein a base having a second screw portion that can be screwed to the first screw portion is provided on the outer periphery of the pipe member so as to be able to advance and retract in the insertion direction by screwing. Mirror insertion aid. When the guide tube into which the endoscope insertion portion is inserted is inserted into the test site through the hole of the test subject having the test site inside, the base of the subject The endoscope insertion aid according to claim 1 , wherein the pipe member is positioned with respect to the test site by abutting against an exterior . The bent portion is composed of a plurality of bent portions,
The endoscope insertion aid according to claim 1 or 2 , wherein a slit is formed inside each bending portion in the bending direction . The guide tube is formed so that the outer diameter increases as it goes from the front end side to the rear end side in the insertion direction,
The endoscope insertion aid according to claim 1 or 2 , wherein a linear slit is formed along the insertion direction inside the bending direction of the bent portion of the guide tube . A slit is formed along the insertion direction inside the bending direction of the bent portion of the guide tube,
The endoscope insertion assisting tool according to claim 1 or 2 , wherein the slit is formed so that the slit width decreases as it goes from the front end side to the rear end side in the insertion direction .

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