JP2011010810A - Endoscope apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope apparatus which can be easily inserted to the object to be observed by surely protruding an endoscope to be bent at a bendable part through an opening part of an overtube.SOLUTION: The endoscope apparatus 1 includes: an electrode E having the bendable part Ea at a tip part; an overtube 2 which is inserted in the electrode E and assists insertion of the electrode E into the body; and an opening part 4 opening on a sidewall at the tip part of the overtube 2. The apparatus is provided with: a first balloon 5 which is provided at a part adjacent to an opening part 4 on a part of an outer peripheral surface of the overtube 2 on the tip side of the opening part 4 in the longitudinal direction of the overtube 2, can be swollen and be contracted in an opening direction of the opening part 4; and a second balloon 6 which is provided at a part adjacent to the opening part 4 being a part of the outer periphery surface of the overtube 2 on a proximal end side of the opening part 4 in the longitudinal direction of the overtube 2, can be swollen and be contracted in the opening direction of the opening part 4.

Description

  The present invention relates to an endoscope apparatus including an endoscope and an overtube for inserting the endoscope.

  As a method for inspecting the human biliary tract (gallbladder and bile duct) and pancreatic duct, a method is known in which an endoscope is inserted and observed in the papilla of the batter and pancreatic juice. Generally, an endoscope having a bendable portion at the tip is used as the endoscope. However, since the position and shape of the puffer papilla vary from person to person and the caliber is small, it is difficult to insert the endoscope by bending the endoscope.

  Conventionally, when inserting an endoscope into the body, as shown in FIG. 5, an endoscope E having a bendable portion Ea at the distal end portion and the endoscope E are inserted, and the endoscope E is inserted into the body. An overtube 51 that assists insertion into the tube, an opening 52 that opens in the side wall of the tip of the overtube 51, and an expansion and contraction provided on the tip of the opening 52 with respect to the length direction of the overtube 51 An endoscope device 54 including a simple balloon 53 is used (see, for example, Patent Document 1). The balloon 53 has an annular shape and is provided so as to surround the outer peripheral surface of the overtube 51.

  In the endoscope apparatus 54, first, the endoscope E is inserted into the overtube 51 from the proximal end 51a of the overtube 51, and in this state, the endoscope E and the overtube 51 are inserted into the duodenum. Next, after the distal end Eb of the endoscope E protrudes from the distal end 51b of the overtube 51 and the farter papilla is confirmed by the endoscope E, the overtube 51 is rotated to open the opening 52 to the farter papilla. It arranges in the position which opposes.

  Next, the balloon 53 is inflated to bring the balloon 53 into close contact with the inner wall of the duodenum, thereby holding the overtube 51 at a position where the opening 52 faces the papilla. At this time, since the balloon 53 is inflated in an annular shape, the overtube 51 is positioned in the vicinity of the central axis of the duodenum.

  Next, the distal end Eb of the endoscope E is retracted to a position facing the opening 52 of the overtube 51. Next, the endoscope E is rotated so that the bending direction of the bendable portion Ea matches the opening 52.

  Next, the endoscope E is bent at the bendable portion Ea, so that the tip Eb protrudes from the opening 52, and the tip Eb is inserted into the furter papilla. At this time, since the biliary tract and the pancreatic duct connected to the pectoral nipple extend toward the proximal end side of the duodenum, the endoscope E is bent in a J shape at the bendable portion Ea, Insert Eb into the furter papilla. As described above, the endoscope E can be inserted into the fatter papilla by the endoscope device 54.

  However, in the endoscope apparatus 54, when the endoscope E is rotated and bent by the bendable portion Ea, and the distal end Eb protrudes from the opening 52 of the overtube 51, the endoscope E is opened. A force is applied in contact with 52 and the overtube 51. Thereby, since the opening part 52 deform | transforms or the overtube 51 bends, there exists a problem that it becomes difficult to protrude the front-end | tip Eb of the endoscope E from the opening part 52. FIG.

  Further, in the endoscope device 54, when the endoscope E is inserted into the furter papilla, the overtube 51 is positioned in the vicinity of the central axis of the duodenum. Narrow. If the space is narrow, it is difficult to insert the endoscope E into the papilla.

JP-A-62-26233

  The present invention eliminates such inconvenience, bends the endoscope having a bendable portion at the distal end portion, and reliably projects the distal end from the opening portion of the overtube so that the endoscope can be easily applied to the observation target portion. An object of the present invention is to provide an endoscope apparatus that can be inserted.

  In order to achieve the above object, the present invention provides an endoscope having a bendable portion at a distal end portion, an overtube for inserting the endoscope and assisting insertion of the endoscope into the body, In an endoscope apparatus provided with an opening that opens to the side wall of the tip of the overtube, a part of the outer peripheral surface of the overtube that is on the tip of the opening with respect to the length direction of the overtube A first balloon provided in a portion adjacent to the opening and inflatable in the opening direction of the opening and capable of being deflated, and on the proximal side of the opening with respect to the length direction of the overtube A second balloon is provided on a part of the outer peripheral surface of the overtube adjacent to the opening, and is inflatable in the opening direction of the opening and is deflated.

  In the endoscope apparatus of the present invention, the endoscope is inserted into the overtube from the proximal end of the overtube, and in this state, the endoscope and the overtube are inserted into the body, for example, the duodenum. Next, after the tip of the endoscope protrudes from the tip of the overtube and the part to be observed is confirmed with the endoscope, for example, the papilla of the furter, the overtube is rotated so that the opening faces the part to be observed. Place it at the position you want.

  Next, the first and second balloons are inflated in the opening direction of the opening and both balloons are brought into close contact with the inner wall of the duodenum, thereby holding the overtube at a position where the opening faces the observation target part.

  At this time, the endoscope apparatus according to the present invention includes a second balloon provided on the proximal side across the opening in addition to the first balloon provided on the distal end side of the opening. As a result, the overtube is firmly held at the position of each balloon. In the endoscope apparatus of the present invention, the first and second balloons expand in the opening direction of the opening, and come into contact with the duodenal inner wall on the side facing the opening. As a result, the center of the duodenum is decentered toward the side away from the observation target portion.

  Next, after retracting the tip of the endoscope to a position facing the opening of the overtube, the tip is projected from the opening by rotating the endoscope and bending it at the bendable portion. Insert into the observation target part.

  At this time, in the endoscope apparatus of the present invention, the overtube is firmly held at the positions of the first and second balloons across the opening, so that the endoscope contacts the opening and the overtube. Even when force is applied, deformation of the opening and bending of the overtube can be prevented.

  Further, in the endoscope apparatus of the present invention, when the endoscope is inserted into the observation target portion, the overtube is positioned eccentrically toward the side away from the observation target portion with respect to the central axis of the duodenum. A large space can be ensured between the observation target portion and the observation target portion.

  Therefore, according to the endoscope apparatus of the present invention, the endoscope having the bendable portion at the distal end is bent so that the distal end reliably protrudes from the opening of the overtube, and the endoscope is moved to the observation target portion. Can be inserted easily.

  By the way, in the endoscope apparatus of the present invention, the relative position of the overtube and the endoscope inserted in the overtube may be twisted. In this case, the position of the opening portion of the overtube and the bending direction of the bendable portion of the endoscope may be shifted, and it may be difficult to bend the endoscope and project the tip from the opening portion.

  Further, in the endoscope apparatus of the present invention, when the overtube is rotated so that the opening portion is opposed to the observation target portion, the overtube may be twisted so that the opening portion cannot be opposed to the observation target portion. .

  Therefore, in the endoscope apparatus of the present invention, the overtube includes an inner peripheral surface having an elliptical shape in a cross-sectional view, and the endoscope has a long axis of the elliptical shape from the proximal end side of the bendable portion. It is preferable to provide at least one wing member projecting in the direction.

  According to the above configuration, the rotation of the inserted endoscope can be restricted by the at least one wing-shaped member coming into contact with the inner peripheral surface of the side wall of the overtube. Thereby, it can prevent that the position of the opening part of an overtube and the bending direction of the bendable part of an endoscope shift | deviate.

  Further, according to the above configuration, when the opening of the overtube is to be opposed to the observation target portion, the endoscope is also rotated together with the overtube so that at least one wing-like member included in the endoscope is provided. Thus, the rotational force of the overtube can be transmitted to the periphery of the opening.

  Therefore, according to the endoscope apparatus having the elliptical wing-like member projecting in the major axis direction of the present invention, the endoscope having the bendable portion at the distal end portion is bent, and the distal end is further opened from the opening portion of the overtube. While being able to project reliably, an opening part can be made to oppose an observation object part reliably.

  Further, the number of the wing-like members may be one, but it is also possible to make a pair. According to the endoscope apparatus provided with the wing-like member protruding in the major axis direction of the elliptical shape of the present invention, the rotation of the inserted endoscope is more reliably restricted by providing the pair of wing-like members. can do.

  In the endoscope apparatus of the present invention, the overtube includes an inner peripheral surface having a bowl shape in which a cross section is formed by combining a large circle and a small circle, and the endoscope includes the overtube. It is good also as what is located in the inside of a large circle part, and is provided with the wing-like member which protrudes in the inside of a small circle part from the base end side of the said bendable part.

  According to the said structure, rotation of the inserted endoscope can be controlled because a wing-like member contact | abuts to the internal peripheral surface of the side wall of the small circle part of an overtube. Thereby, it can prevent that the position of the opening part of an overtube and the bending direction of the bendable part of an endoscope shift | deviate.

  Therefore, according to the endoscope apparatus including the wing-like member protruding inside the small circular portion of the present invention, the endoscope having the bendable portion at the distal end portion is bent, and the distal end is more reliably secured from the opening of the overtube. Can be projected.

  Alternatively, in the endoscope apparatus according to the present invention, the overtube includes a guide member provided along the length direction on the inner peripheral surface of the base end side of the opening with respect to the length direction, The endoscope may include a sliding member provided on the proximal end side of the bendable portion and slidably provided along the guide member.

  According to the said structure, rotation of the endoscope inserted can be controlled by sliding a sliding member along a guide member. Thereby, it can prevent that the position of the opening part of an overtube and the bending direction of the bendable part of an endoscope shift | deviate.

  Therefore, according to the endoscope apparatus including the guide member and the sliding member of the present invention, the endoscope having the bendable portion at the distal end portion is bent so that the distal end protrudes more reliably from the opening portion of the overtube. be able to.

1 shows an example of a configuration of an endoscope apparatus according to a first embodiment, FIG. 1A is an explanatory sectional view of the endoscope apparatus, and FIG. 1B is an endoscope shown in FIG. It is BB sectional drawing of the overtube which concerns on an apparatus. Explanatory drawing which shows the 1st modification of the endoscope apparatus of 1st Embodiment. Explanatory drawing which shows the 2nd modification of the endoscope apparatus of 1st Embodiment. Explanatory drawing which shows the example of 1 structure of the endoscope apparatus of 2nd Embodiment. Explanatory drawing which shows the endoscope apparatus of a prior art.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

  Next, the endoscope apparatus according to the first embodiment will be described with reference to FIG. As shown in FIG. 1A, an endoscope apparatus 1 according to the first embodiment interpolates an endoscope E having a bendable portion Ea at a distal end portion and the endoscope E. And an overtube 2 for assisting insertion into the body.

  The overtube 2 is formed of a cylindrical body having an inner peripheral surface 3 (see FIG. 1 (b)) having an elliptical shape in cross section, and has an opening 4 opened in a side wall of a distal end portion and a pair of expandable / shrinkable pairs. Balloons 5 and 6 are provided.

  The pair of balloons 5 and 6 are provided in a part of the outer peripheral surface of the overtube 2 adjacent to the opening 4 at a position sandwiching the opening 4 with respect to the length direction of the overtube 2. The pair of balloons 5 and 6 includes a distal end side balloon 5 provided on the distal end side of the opening 4 and a proximal end side balloon 6 provided on the proximal end side of the opening 4.

  The balloons 5 and 6 are connected to the balloon operation units 9 and 10 via fluid passages 7 and 8 disposed in the side wall of the overtube 2. The balloons 5 and 6 are expanded or contracted in a spherical shape in the opening direction of the opening 4 by supplying or discharging a fluid through the fluid passages 7 and 8 by the operation of the balloon operating units 9 and 10. It has become.

  A cylindrical member 11 is attached to the outer peripheral surface of the proximal end side of the bendable portion Ea of the endoscope E. On the outer peripheral surface of the cylindrical member 11, a pair of wing-like members 12 and 13 projecting in the elliptical long axis direction of the overtube 2 are provided. As shown in FIG. 1B, the pair of wing-like members 12 and 13 has a total length L of the protruding height and the diameter of the endoscope E shorter and shorter than the length La of the long axis of the elliptical shape. It is formed so as to be longer than the shaft length Lb.

  Next, a method of using the endoscope apparatus 1 according to this embodiment will be described with reference to FIG. In the present embodiment, a case will be described in which the endoscope E is inserted into the phater nipple to observe the biliary tract and pancreatic duct.

  In the endoscope apparatus 1 of the present embodiment, first, the endoscope E is inserted into the overtube 2 from the proximal end 2a of the overtube 2, and in this state, the endoscope E and the overtube 2 are inserted into the duodenum. . Next, after the distal end Eb of the endoscope E protrudes from the distal end 2b of the overtube 2 and the furter papilla is confirmed by the endoscope E, the overtube 2 is rotated to open the opening 4 to the furter papilla. It arranges in the position which opposes.

  At this time, in the endoscope apparatus 1 according to the present embodiment, the endoscope E is rotated together with the overtube 2, thereby rotating the pair of wing-like members 12 and 13 provided in the endoscope E. Since the turning force of the overtube 2 can be transmitted to the periphery of the opening 4, the opening 4 can be reliably opposed to the papilla papilla.

  Next, fluid is supplied by the operation of the balloon operation portions 9 and 10, the pair of balloons 5 and 6 are inflated, and the pair of balloons 5 and 6 are brought into close contact with the inner wall of the duodenum. The overtube 2 is held at a position facing the nipple.

  At this time, in the endoscope apparatus 1 of this embodiment, in addition to the distal end side balloon 5 provided on the distal end side of the opening 4, the proximal end balloon 6 provided on the proximal end side with the opening 3 interposed therebetween. The overtube is firmly held at the positions of the balloons 5 and 6.

  In the endoscope apparatus 1 of the present embodiment, the balloons 5 and 6 expand in a spherical shape in the opening direction of the opening 4 and come into contact with the duodenal inner wall on the side facing the opening 4. As a result, the overtube 2 is positioned eccentrically from the central axis of the duodenum toward the side farther from the furter papilla.

  Next, the distal end Eb of the endoscope E is retracted to a position facing the opening 4 of the overtube 2, and the bending direction of the bendable part Ea is matched with the opening 4.

  At this time, in the endoscope apparatus 1 of the present embodiment, the pair of wing-like members 12 and 13 provided on the proximal end side of the bendable portion Ea of the endoscope E are the inner peripheral surfaces of the side walls of the overtube 2. 3, the rotation of the inserted endoscope E is restricted. As a result, the position of the opening 4 of the overtube 2 and the bending direction of the bendable part Ea of the endoscope E can be prevented from shifting. Therefore, the bending direction of the bendable portion Ea can be matched with the opening 4 simply by retracting the distal end Eb of the endoscope E to a position facing the opening 4 of the overtube 2.

  Next, the endoscope E is bent at the bendable portion Ea, so that the distal end Eb protrudes from the opening 4. Next, in a state where the endoscope E is further bent by the bendable portion Ea and maintained in a J-shape, the distal end Eb is inserted into the furter papilla. At this time, as shown in FIG. 1, the endoscope E is brought into contact with the distal end side balloon 5, and the endoscope E is inverted with the distal end side balloon 5 as a fulcrum, thereby being inserted deep. Can do.

  At this time, in the endoscope apparatus 1 of the present embodiment, the overtube 2 is firmly held at the position of the pair of balloons 5 and 6 with the opening 4 interposed therebetween, whereby the endoscope E is Even when a force is applied in contact with the opening 4 and the overtube 2, deformation of the opening 4 and bending of the overtube 2 can be prevented. Therefore, the endoscope apparatus 1 according to the present embodiment can bend the endoscope E by the bendable portion Ea and reliably project the distal end Eb from the opening 4 of the overtube 2.

  Further, in the endoscope apparatus 1 of the present embodiment, when the endoscope E is inserted into the furter papilla, the overtube 2 is positioned eccentrically toward the side away from the puffer papilla from the central axis of the duodenum. Therefore, a wide space can be ensured between the opening 4 and the furter papilla. Thereby, the endoscope apparatus 1 of the present embodiment can easily insert the endoscope E into the furter papilla.

  Although the endoscope apparatus 1 according to the present embodiment includes a pair of wing-like members 12 and 13, the number of wing-like members may be one. Next, with reference to FIG.2 and FIG.3, the modification of the endoscope apparatus 1 of this embodiment is demonstrated.

  As shown in FIG. 2 (a), an endoscope apparatus 21 of the first modification shown in FIG. 2 inserts an endoscope E having a bendable portion Ea at the distal end portion and the endoscope E, And an overtube 22 for assisting insertion of the endoscope E into the body.

  The overtube 22 has the same configuration as the overtube 2 of the endoscope apparatus 1 shown in FIG. 1 except that the overtube 22 is formed of a cylindrical body having an inner peripheral surface 23 (see FIG. 2B) having an elliptical shape in cross section. It has. In the elliptical shape, the major axis direction corresponds to the opening direction of the opening 4.

  On the outer peripheral surface of the proximal end side of the bendable portion Ea of the endoscope E, as shown in FIG. 2B, a mounting member 24 having a C-shaped cross section that opens downward is mounted. On the outer peripheral surface of the mounting member 24 on the side facing the opening 4, one wing-like member 25 protruding in the major axis direction of the elliptical shape of the overtube 22 is provided.

  As shown in FIG. 2B, the wing-like member 25 has a total length L of the protrusion height and the diameter of the endoscope E shorter than the length La of the major axis of the elliptical shape and the length Lb of the minor axis. It is formed to be equivalent to.

  In the endoscope apparatus 21 of the present embodiment, since the wing-like member 25 is provided on the proximal end side of the bendable portion Ea of the endoscope E, the wing-like member 25 is formed on the inner peripheral surface 23 of the side wall of the overtube 22. By abutting, the rotation of the endoscope E inserted can be restricted. Thereby, it can prevent that the position of the opening part 4 of the overtube 22 and the bending direction of the bendable part Ea of the endoscope E shift.

  As shown in FIG. 3 (a), an endoscope apparatus 31 of the second modification shown in FIG. 3 inserts an endoscope E having a bendable portion Ea at the distal end portion and the endoscope E, And an overtube 32 for assisting insertion of the endoscope E into the body.

  The overtube 32 is an inner tube shown in FIG. 1 except that the overtube 32 is formed of a cylindrical body having an inner peripheral surface 33 (see FIG. 2B) having a bowl shape formed by joining a large circle and a small circle in cross section. The same configuration as the overtube 2 of the endoscope apparatus 1 is provided. In the shape of the collar, the long axis direction corresponds to the opening direction of the opening 4.

  The endoscope E is located inside the bowl-shaped great circle portion 32 a of the overtube 32. On the outer peripheral surface of the proximal end side of the bendable portion Ea of the endoscope E, as shown in FIG. 3B, a mounting member 34 having a C shape that opens downward in a cross-sectional view is mounted. . On the outer peripheral surface of the mounting member 34 facing the opening 4, one wing-like member 35 is provided that protrudes into the small circular portion of the overtube 32.

  In the endoscope apparatus 31 of the present embodiment, since the wing-like member 35 is provided on the proximal end side of the bendable portion Ea of the endoscope E, the wing-like member 35 is the inner periphery of the small circle portion 33 b of the overtube 32. By contacting the surface 33, the rotation of the inserted endoscope E can be restricted. Thereby, it can prevent that the position of the opening part 4 of the overtube 32 and the bending direction of the bending | flexion possible part Ea of the endoscope E shift | deviate.

  Next, an endoscope apparatus 41 according to the second embodiment will be described with reference to FIG. As shown in FIG. 4A, an endoscope apparatus 41 according to the second embodiment interpolates an endoscope E having a bendable portion Ea at a distal end portion and the endoscope E. And an overtube for assisting insertion into the body.

  The overtube 42 is formed of a cylindrical body having an inner peripheral surface 43 (see FIG. 4B) that has a substantially circular shape in cross-sectional view. The overtube 42 has an opening 4 that opens at the side wall of the tip, and 1 that can expand and contract. A pair of balloons 5 and 6 are provided.

  The pair of balloons 5 and 6 are provided in a part of the outer peripheral surface of the overtube 42 adjacent to the opening 4 at a position sandwiching the opening 4 with respect to the length direction of the overtube 42. The pair of balloons 5 and 6 includes a distal end side balloon 5 provided on the distal end side of the opening 4 and a proximal end side balloon 6 provided on the proximal end side of the opening 4.

  The balloons 5 and 6 are connected to the balloon operation portions 9 and 10 via fluid passages 7 and 8 disposed in the side wall of the overtube 42. The balloons 5 and 6 are expanded or contracted in a spherical shape in the opening direction of the opening 4 by supplying or discharging a fluid through the fluid passages 7 and 8 by the operation of the balloon operating units 9 and 10. It has become.

  Further, the overtube 42 includes a guide member 44 provided along the length direction on the inner peripheral surface of the base end side of the opening 4 with respect to the length direction.

  On the outer peripheral surface of the proximal end side of the bendable portion Ea of the endoscope E, a sliding member 45 is mounted so as to be slidable along the guide member 44.

  Next, a method of using the endoscope apparatus 41 of the present embodiment will be described with reference to FIG. In the present embodiment, a case will be described in which the endoscope E is inserted into the phater nipple to observe the biliary tract and pancreatic duct.

  In the endoscope apparatus 41 of the present embodiment, first, the endoscope E is inserted into the overtube 42 from the proximal end 42a of the overtube 42, and in this state, the endoscope E and the overtube 42 are inserted into the duodenum. . Next, after the distal end Eb of the endoscope E protrudes from the distal end 42b of the overtube 42 and the farther papilla is confirmed by the endoscope E, the overtube 2 is rotated to open the opening 4 of the overtube. Place it at the position facing the papilla.

  Next, fluid is supplied by the operation of the balloon operation portions 9 and 10, the pair of balloons 5 and 6 are inflated, and the pair of balloons 5 and 6 are brought into close contact with the inner wall of the duodenum. The overtube 42 is held at a position facing the nipple.

  At this time, in the endoscope apparatus 1 of this embodiment, in addition to the distal end side balloon 5 provided on the distal end side of the opening 4, the proximal end balloon 6 provided on the proximal end side with the opening 3 interposed therebetween. Furthermore, the overtube is firmly held at the position of the pair of balloons 5 and 6.

  In the endoscope apparatus 41 of the present embodiment, the balloons 5 and 6 expand in a spherical shape in the opening direction of the opening 4 and come into contact with the duodenal inner wall on the side facing the opening 4. As a result, the overtube 42 is positioned eccentrically from the central axis of the duodenum toward the side farther from the furter papilla.

  Next, the distal end Eb of the endoscope E is retracted to a position facing the opening 4 of the overtube 42 so that the bending direction of the bendable part Ea matches the opening 4.

  At this time, in the endoscope apparatus 41 of the present embodiment, the sliding member 45 provided on the proximal end side of the bendable portion Ea of the endoscope E is slid along the guide member 44, thereby interpolating. The rotation of the endoscope E is restricted. As a result, the position of the opening 4 of the overtube 42 and the bending direction of the bendable portion Ea of the endoscope E can be prevented from shifting. Therefore, the bending direction of the bendable portion Ea can be matched with the opening 4 simply by retracting the distal end Eb of the endoscope E to a position facing the opening 4 of the overtube 42.

  Next, the endoscope E is bent at the bendable portion Ea, so that the distal end Eb protrudes from the opening 4. Next, in a state where the endoscope E is further bent by the bendable portion Ea and maintained in a J-shape, the distal end Eb is inserted into the furter papilla.

  At this time, in the endoscope apparatus 41 of the present embodiment, the overtube 42 is firmly held at the position of the pair of balloons 5 and 6 with the opening 4 interposed therebetween, whereby the endoscope E is opened. Even when a force is applied in contact with 4 and the overtube 42, the deformation of the opening 4 and the bending of the overtube 42 can be prevented. Therefore, the endoscope apparatus 41 of this embodiment can bend the endoscope E by the bendable portion Ea and reliably project the distal end Eb from the opening 4 of the overtube 42.

  Further, in the endoscope apparatus 41 of the present embodiment, when the endoscope E is inserted into the furter papilla, the overtube 42 is positioned eccentrically toward the side away from the furter papilla from the central axis of the duodenum. Therefore, a wide space can be ensured between the opening 4 and the furter papilla. Thereby, the endoscope apparatus 41 of the present embodiment can easily insert the endoscope E into the furter papilla.

  DESCRIPTION OF SYMBOLS 1 ... Endoscope apparatus, 2 ... Overtube, 3 ... Inner peripheral surface which makes cross-sectional view ellipse shape, 4 ... Opening part, 5 ... 1st balloon, 6 ... 2nd balloon, 12, 13 ... 1 pair 21 ... Endoscopic device, 22 ... Overtube, 23 ... Inner circumferential surface having an elliptical shape in cross section, 25 ... Wing-like member, 31 ... Endoscope device, 32 ... Overtube, 33 ... Cross section 35: wing member, 41: endoscopic device, 42: overtube, 43 ... inner peripheral surface, 44 ... guide member, 45 ... sliding member, E ... endoscope, Ea: bendable part.

Claims (5)

An endoscope having a bendable portion at the distal end portion;
An overtube for inserting the endoscope and assisting insertion of the endoscope into the body;
In an endoscope apparatus provided with an opening that opens to the side wall of the tip of the overtube,
It is provided on the tip side of the opening with respect to the length direction of the overtube and at a part of the outer peripheral surface of the overtube adjacent to the opening, and is expandable in the opening direction of the opening. A first and deflated first balloon;
Provided on the base end side of the opening with respect to the length direction of the overtube and at a part of the outer peripheral surface of the overtube adjacent to the opening, and expandable in the opening direction of the opening An endoscope apparatus comprising a second balloon that is contractible. The overtube includes an inner peripheral surface having an elliptical shape in a cross-sectional view,
The endoscope apparatus according to claim 1, wherein the endoscope includes at least one wing-like member that protrudes in a major axis direction of the elliptical shape from a base end side of the bendable portion.   The endoscope apparatus according to claim 2, wherein the endoscope includes a pair of the wing-shaped members. The overtube includes an inner peripheral surface having a bowl shape in which a cross section is formed by combining a large circle and a small circle,
2. The endoscope includes a wing-like member that is located inside a great circle portion of the overtube and protrudes from a proximal end side of the bendable portion into a small circle portion. The endoscope apparatus described. The overtube includes a guide member provided along the length direction on the inner peripheral surface of the base end side of the opening with respect to the length direction,
The endoscope according to claim 1, further comprising: a sliding member provided on a proximal end side of the bendable portion and slidably provided along the guide member. Mirror device.

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