JP2024173018A - Endoscope tube and endoscope - Google Patents

Abstract

To provide an endoscope tube and an endoscope that can prevent buckling and diameter increase of a tip-side tube.SOLUTION: An endoscope tube comprises: a tip side tube 50; a coil 58 wound around at least a portion of a first tube external surface 50a, which is an external surface of the tip side tube 50; a base end side tube 60; and a connection pipe 70 connecting the tip side tube 50 and the base end side tube 60. The tip side tube 50 comprises a tube base end part (first tube base end part 54) which is located closer to the base end side of the tip side tube 50 than to the base end of the coil 58. The tube base end part comprises: a connection region W1A which is connected to the connection pipe 70 and is in contact with the connection pipe 70; and a non-connection region W1B which is located closer to a tip side of the tip side tube 50 than to the connection pipe 70.SELECTED DRAWING: Figure 8

Description

The present invention relates to an endoscope tube that is inserted into the insertion section of an endoscope, and an endoscope equipped with this endoscope tube.

Various types of endoscopes, such as bronchoscopes and ultrasonic endoscopes, are used in the medical field. Endoscopes are equipped with an insertion section that is inserted into a subject, and an operation section. In such endoscopes, various treatment tools are introduced through a treatment tool inlet provided in the operation section, and the treatment tools are used for treatment by leading them out from a treatment tool outlet opening at the tip of the insertion section. An endoscopic tube, such as a treatment tool insertion tube (also called a channel) through which the treatment tool is inserted, is inserted and arranged inside the insertion section of the endoscope.

Patent Documents 1 to 4 describe forming a spiral groove on part of the outer surface of the endoscope tube and winding a coil around this spiral groove in order to prevent the endoscope tube from buckling when the insertion portion is bent.

Patent document 4 describes a method for easily and accurately manufacturing an endoscope tube by constructing the endoscope tube from two tubes, a distal tube and a proximal tube, and connecting the distal tube and the proximal tube with a connecting pipe.

The base end of the distal tube described in Patent Document 4 has a connection region that is externally connected to the distal end of the connection pipe, and a coil winding region around which a coil is wound. The connection region is provided at the most proximal end of the proximal end of the distal tube, and is a non-wound region around which no coil is wound. The coil winding region is provided contiguous to the distal side of the connection region. As a result, the coil is wound around the outer surface of the proximal end of the distal tube up to a position immediately adjacent to the connection region that is externally connected to the connection pipe.

JP 2017-000330 A JP 2009-247413 A JP 2008-229067 A International Publication No. 2013/088791

In the endoscopic tube described in Patent Document 4, when a coil is wound around the outer surface of the base end of the distal tube, the coil is wound up to a position immediately adjacent to the connection area. Therefore, when the bending portion of the insertion portion is bent in response to a bending operation at the operation portion, depending on the position of the connection area within the insertion portion, stress may be concentrated at a position immediately adjacent to the connection area (the boundary between the connection area and the coil winding area), causing buckling. In addition, the coil may ride up onto the connection area, increasing the outer diameter of the connection area.

The present invention was made in consideration of these circumstances, and aims to provide an endoscope tube and an endoscope that can prevent buckling and thickening of the distal tube.

The endoscopic tube according to the first aspect of the present invention is an endoscopic tube that is inserted into an insertion section of an endoscope, and includes a tip tube, a coil wound around at least a portion of the first tube outer surface, which is the outer surface of the tip tube, a base tube, and a connection pipe that connects the tip tube and the base tube, and the tip tube has a tube base end located closer to the base end of the tip tube than the base end of the coil, and the tube base end has a connection region that is connected to and in contact with the connection pipe, and a non-connection region that is closer to the tip of the tip tube than the connection pipe.

This endoscope tube prevents the distal tube from buckling and becoming thicker.

In the second aspect of the present invention, the endoscope tube according to the first aspect has a spiral groove formed on at least a portion of the outer surface of the first tube, a coil is wound around at least a portion of the groove on the distal side of the tube distal to the proximal end, and a groove is formed on the outer surface of the first tube at the proximal end of the tube.

In the third aspect of the present invention, the endoscope tube according to the first or second aspect has a flange that protrudes radially outward from the connecting pipe on the outer surface of the pipe, and the base end of the tube base end and the tip of the base-side tube abut against the flange. This makes it possible to position the base end of the tube base end and the tip of the base-side tube when connecting the tube base end and the base-side tube to the connecting pipe.

The endoscope tube according to the fourth aspect of the present invention, in any one of the first to third aspects, has at least one of a tip-side expanded diameter surface formed on the inner surface of the pipe tip, which is the tip of the connecting pipe, and expanding the inner diameter of the pipe tip toward the tip side of the pipe tip, and a base-side expanded diameter surface formed on the inner surface of the pipe base, which is the base end of the connecting pipe, and expanding the inner diameter of the pipe base toward the base side of the pipe base. This makes it possible to reduce the step between the inner surface of the tip-side tube and the inner surface of the connecting pipe, or to reduce the step between the inner surface of the base-side tube and the inner surface of the connecting pipe.

In the fifth aspect of the present invention, the endoscope tube is any one of the first to fourth aspects, in which the second tube outer surface, which is the outer surface of the base end tube, is a smooth surface.

In the sixth aspect of the present invention, the length of the non-connected region of the endoscope tube is 40 mm to 60 mm in any of the first to fifth aspects.

The seventh aspect of the present invention relates to an endoscope tube according to any one of the first to sixth aspects, in which the base end tube has a tube tip portion connected to a connecting pipe, and the outer diameter of the coil is smaller than the outer diameter of at least one of the tube base end portion and the tube tip portion. This prevents the diameter of the tip end tube around which the coil is wound from becoming thicker.

The endoscope according to the eighth aspect of the present invention comprises an insertion section having a bending section and a flexible section connected to the bending section, and an endoscope tube according to any one of the first to seventh aspects inserted into the insertion section.

The ninth aspect of the present invention is an endoscope according to the eighth aspect, in which the distal tube is disposed within the bending section, and the proximal tube and the connecting pipe are disposed within the flexible section.

The endoscope according to the tenth aspect of the present invention is the endoscope according to the eighth or ninth aspect, in which the connection pipe is disposed between 200 mm and 400 mm from the tip of the insertion section.

The present invention can prevent buckling and thickening of the distal tube.

FIG. 1 is an overall view of an endoscope. FIG. FIG. 4 is an enlarged view of a portion of the treatment instrument insertion tube shown in FIG. 3 by an ellipse C. FIG. FIG. FIG. FIG. 4 is an enlarged view of a base end portion of the first tube.

[Overall configuration of the endoscope]
Fig. 1 is an overall view of an endoscope 1. As shown in Fig. 1, the endoscope 1 is, for example, a bronchoscope, and is used for observing observation sites (which may be lesions, examination sites, or diagnostic sites) of the trachea, bronchi, and lungs, and for sampling cell tissue, etc. Bronchoscopes are required to have a smaller diameter than gastrointestinal endoscopes because of the places where they are used, and even in those having a treatment tool insertion tube 23 (see Fig. 3), the outer diameter of the tip body 34 is 4 mm to 6 mm, and the outer diameter of the flexible section 30 is 4 mm to 7 mm.

The endoscope 1 comprises an operation section 10 that is held by the practitioner to perform various operations, an insertion section 12 that is inserted into the patient's body, and a universal cord 14. The endoscope 1 is connected via the universal cord 14 to system components such as a processor device and a light source device (not shown) that constitute the endoscope system.

The operation unit 10 is provided with various operating members that are operated by the practitioner, such as an angle lever 16 and a suction button 22.

The operating section 10 is also provided with a treatment tool introduction section 25. This treatment tool introduction section 25 is provided with a treatment tool introduction port 24 for inserting a treatment tool (not shown, same below) into a treatment tool insertion tube 23 (see FIG. 3) in the insertion section 12.

The insertion section 12 extends from the tip of the operating section 10 and is formed in a long shape with a small diameter as a whole. The insertion section 12 is composed of a flexible section 30, a passive bending section 31, a bending section 32, and a tip body 34, in that order from the base end side to the tip end side.

The flexible section 30 occupies most of the proximal end of the insertion section 12 and is composed of, for example, a metallic spiral tube (a spirally wound metal plate) and a net (not shown), the outer periphery of which is further coated with resin. This flexible section 30 has flexibility that allows it to bend in any direction, and when the insertion section 12 is inserted into a body cavity, it bends along the insertion path into the body cavity.

The passive bending section 31 is composed of, for example, a metallic spiral tube (a metal plate wound in a spiral shape) and a net (not shown), and is further covered with an angle rubber (not shown) together with the bending section 32 described below. This passive bending section 31 is configured to be more flexible than the flexible section 30 so that it can bend passively in response to an external force, and when the insertion section 12 is inserted into the body cavity, it bends along the insertion path into the body cavity in the same way as the flexible section 30.

The bending section 32 is, for example, configured by connecting multiple bending pieces (not shown), and is an active bending section that can be actively bent in the up-down direction (A2 direction) by rotating the angle lever 16 of the operation section 10 in the A1 direction. By bending this bending section 32, the tip body 34 can be oriented in a desired direction. Note that a pair of angle knobs may be provided instead of the angle lever 16, and the bending section 32 may be bent in the up-down direction and the left-right direction by rotating the pair of angle knobs.

Figure 2 is a perspective view of the tip body 34. As shown in Figure 2, the tip surface 34a of the tip body 34 is provided with an observation window 40, a pair of illumination windows 42, and a treatment tool outlet 44. Inside the tip body 34, behind the observation window 40, there are provided an observation optical system including a lens and an imaging unit including an image sensor, although not shown in the figure. The imaging unit captures an image of the observation site through the observation optical system and outputs a signal of the observation image.

Inside the tip body 34, behind the pair of illumination windows 42, the emission ends of light guides (not shown) are located.

The treatment tool outlet 44 outputs the treatment tool inserted into the treatment tool insertion tube 23 (see Figure 3) from the treatment tool introduction port 24.

Returning to FIG. 1, the universal cord 14 includes a signal cable connected to the imaging element of the observation optical system, the light guide, and the like, although not shown. A connector is provided at an end (not shown) of the universal cord 14. The connector is connected to a predetermined system component device that constitutes an endoscope system, such as a processor device and a light source device. This allows the system component device to supply the endoscope 1 with power, control signals, illumination light, and the like required for the operation of the endoscope 1. In addition, a signal of an observation image acquired by the observation optical system is transmitted from the endoscope 1 to the system component device (processor device). The signal transmitted to the system component device is image-processed, and an observation image of the observation site is displayed on a monitor (not shown). In addition, illumination light is supplied from the system component device (light source device) to the light guide, and the illumination light is irradiated onto the observation site from a pair of illumination windows 42.

The configuration of the operation unit 10 and the tip body 34 is not limited to the configuration shown in Figures 1 and 2, but can be changed to various configurations used in known bronchoscopes.

[Treatment tool insertion tube]
Fig. 3 is a side view of the treatment instrument insertion tube 23. Fig. 4 is an enlarged view of a portion of the treatment instrument insertion tube 23 indicated by an ellipse C in Fig. 3. Fig. 5 is an exploded view of the treatment instrument insertion tube 23.

As shown in Figures 3 to 5, the treatment tool insertion tube 23 (also called the treatment tool insertion channel) is a resin tube equivalent to the endoscope tube of the present invention, and is connected to the treatment tool introduction port 24 and the treatment tool outlet 44 via a known branching section (not shown), and guides the treatment tool inserted into the treatment tool introduction port 24 to the treatment tool outlet 44. Note that in Figures 3 and 4, the symbol WA is the bending section range indicating the range of the passive bending section 31 and the bending section 32 in the insertion section 12, and the symbol WB is the flexible section range indicating the range of the flexible section 30 in the insertion section 12.

The treatment tool insertion tube 23 is composed of a distal tube 50, a coil 58 wound (wound) around the outer surface of the distal tube 50, a proximal tube 60, and a connecting pipe 70. Note that the coil 58 is omitted from FIG. 3 to avoid cluttering the drawing.

The distal tube 50 is disposed in the bending section range WA, i.e., in the bending section 32 and the passive bending section 31. The distal tube 50 is, for example, a PTFE (polytetrafluoroethylene) tube. Note that the passive bending section 31 is also included in the "bending section" of the present invention. In addition, the entire distal tube 50 does not need to be disposed in the bending section range WA, and a part of the distal tube 50 (for example, the first tube base end 54 described below) may be disposed in the flexible section range WB, i.e., in the flexible section 30.

The distal tube 50 has a first tube distal end 52 that is connected to the treatment tool outlet 44, and a first tube proximal end 54 (corresponding to the tube proximal end of the present invention) that is connected to the distal side of the connecting pipe 70 described below.

A helical groove 56, which is a helical groove for winding the coil 58, is formed on the entire area (including almost the entire area) of the first tube outer surface 50a (see FIG. 4, etc.), which is the outer surface of the distal tube 50. The helical groove 56 may be formed on only a part of the first tube outer surface 50a, without forming the helical groove 56 on the entire area of the first tube outer surface 50a. In other words, it is sufficient that the helical groove 56 is formed on at least a part of the first tube outer surface 50a.

The coil 58 is wound around the spiral groove 56 formed on the first tube outer surface 50a of the first tube tip 52. As a result, the coil 58 is wound around the entire area (including almost the entire area) of the first tube outer surface 50a of the tip tube 50 on the tip side of the first tube base end 54. In other words, the first tube base end 54 is located on the base end side of the tip tube 50 from the base end of the coil 58. The coil 58 may be wound around a part of the spiral groove 56 without being wound around the entire spiral groove 56. In other words, the coil 58 may be wound around at least a part of the spiral groove 56 on the tip side of the first tube base end 54. The coil 58 prevents buckling of the tip tube 50 when the bending section 32 and the passive bending section 31 are bent. The first tube base end 54 will be described later (see FIG. 8 described later).

The outer diameter of the coil 58 is smaller than at least one of the outer diameter of the first tube base end 54 and the outer diameter of the second tube tip end 62 of the base end tube 60 described below. This prevents the diameter of the tip end tube 50 around which the coil 58 is wound from becoming too large.

The base-side tube 60 is disposed in the flexible section range WB, i.e., within the flexible section 30. The base-side tube 60 is, for example, a PTFE (polytetrafluoroethylene) tube. This base-side tube 60 has a second tube tip 62 connected to the base side of the connection pipe 70, and a second tube base end (not shown) connected to the treatment tool introduction port 24.

The second tube outer surface 60a, which is the outer surface of the base-end tube 60, is a smooth surface. A smooth surface here refers to a surface that does not have a spiral groove 56 for winding the coil 58.

The connection pipe 70 is disposed in the flexible section range WB, i.e., within the flexible section 30. Furthermore, in this embodiment, the connection pipe 70 is disposed within the flexible section 30 and between 200 mm and 400 mm from the tip (tip surface 34a) of the insertion section 12. This connection pipe 70 connects the tip side tube 50 and the base end side tube 60.

Figure 6 is an enlarged view of the connection pipe 70. Figure 7 is an enlarged cross-sectional view of the connection pipe 70. As shown in Figures 5 to 7, the connection pipe 70 has a pipe tip 72 to which the first tube base end 54 is externally connected, and a pipe base 74 to which the second tube tip 62 is externally connected.

The outer diameter of the pipe tip 72 is slightly larger than the inner diameter of the first tube base end 54, so when the first tube base end 54 is externally fitted to the pipe tip 72, the first tube base end 54 is expanded in diameter by the pipe tip 72. Similarly, the outer diameter of the pipe base end 74 is slightly larger than the inner diameter of the second tube tip 62, so when the second tube tip 62 is externally fitted to the pipe base end 74, the second tube tip 62 is expanded in diameter by the pipe base end 74.

The first tube base end 54 and the pipe tip end 72 are fixed with an adhesive (e.g., epoxy resin) (not shown). Similarly, the second tube tip end 62 and the pipe base end 74 are also fixed with an adhesive.

The pipe outer surface 70a, which is the outer surface of the connection pipe 70, is provided with a flange 76 that protrudes radially outward from the connection pipe 70. The base end of the first tube base end 54, which is externally connected to the pipe tip end 72, and the tip of the second tube tip end 62, which is externally connected to the pipe base end 74, abut against the flange 76. This allows the base end of the first tube base end 54 and the tip of the second tube tip end 62 to be positioned. Note that there may be gaps between the base end of the first tube base end 54 and the flange 76, and between the tip of the second tube tip end 62 and the flange 76, for filling with the above-mentioned adhesive.

The inner surface 78 of the connecting pipe 70 is formed with a tip end enlarged diameter surface 78a and a base end enlarged diameter surface 78b (see Figure 7).

The tip-side expanded diameter surface 78a is the pipe inner surface 78 of the pipe tip 72, and is a tapered surface that gradually expands the inner diameter of the pipe tip 72 toward the tip side of the pipe tip 72. The base-side expanded diameter surface 78b is the pipe inner surface 78 of the pipe base 74, and is a tapered surface that gradually expands the inner diameter of the pipe base 74 toward the base side of the pipe base 74.

By forming the tip-side expanded diameter surface 78a, the step between the inner surface of the first tube base end 54 and the inner surface of the pipe tip 72 (tip-side expanded diameter surface 78a) at the connection portion between the first tube base end 54 and the pipe tip 72 is reduced. Also, by forming the base-side expanded diameter surface 78b, the step between the inner surface of the pipe base end 74 (base-side expanded diameter surface 78b) and the inner surface of the second tube tip 62 at the connection portion between the pipe base end 74 and the second tube tip 62 is reduced. This prevents the tip of the treatment tool inserted into the treatment tool insertion tube 23 from getting caught on these steps when it passes through the connection pipe 70. As a result, the tip of the treatment tool can move smoothly inside the treatment tool insertion tube 23.

In this embodiment, both the tip side expanded diameter surface 78a and the base side expanded diameter surface 78b are formed on the pipe inner surface 78, but only one of them may be formed. Furthermore, the tip side expanded diameter surface 78a and the base side expanded diameter surface 78b may include a portion where the inner diameter does not change or may be formed in a curved shape, as long as it does not impede the smooth movement of the tip of the treatment tool.

[First tube base end portion]
Fig. 8 is an enlarged view of the first tube base end 54. As shown in Fig. 8, the first tube base end 54 has a non-winding region W1. The non-winding region W1 is a region where the spiral groove 56 is formed on the first tube outer surface 50a, but the coil 58 is not wound around the spiral groove 56. The non-winding region W1 includes a connection region W1A and a non-connection region W1B.

The connection region W1A is the region closest to the base end of the first tube base end 54, and is fitted around and connected to the pipe tip end 72, making contact with the pipe tip end 72.

The non-connected region W1B is provided contiguous with the tip side of the connected region W1A, and is a region located further towards the tip side than the pipe tip 72. The length of this non-connected region W1B is, for example, 40 mm to 60 mm. The coil winding region W2 is provided contiguous with the tip side of the non-connected region W1B, i.e., the tip side of the first tube base end 54. The coil winding region W2 is a region where the coil 58 is wound around the spiral groove 56 formed on the first tube outer surface 50a.

If the non-connection region W1B is not provided at the tip side of the connection region W1A, that is, if the coil 58 is wound around the first tube outer surface 50a of the first tube base end 54 up to a position very close to the connection region W1A, there is a risk that stress will concentrate at the very close position and buckling will occur when the curved portion 32 of the insertion section 12 is curved. In addition, there is a risk that the coil 58 will ride up onto the connection region W1A, increasing the outer diameter of the connection region W1A.

In contrast, in this embodiment, by providing a non-connection region W1B on the distal side of the connection region W1A where the coil 58 is not wound, when the curved portion 32 of the insertion portion 12 or the like is curved, the stress is dispersed throughout the non-connection region W1B without concentrating in the above-mentioned immediate position, and therefore buckling of the first tube base end 54 is prevented. In addition, the effect of preventing buckling is also affected by the arrangement of the non-wrapped region W1. Here, as described above, the first tube base end 54 (non-wrapped region W1) can be arranged within the flexible portion 30, so that the buckling prevention effect can be more effectively achieved by arranging the non-wrapped region W1 within the flexible portion 30 with a large curvature radius than by arranging it within the curved portion 32 with a small curvature radius. Furthermore, when the curved portion 32 of the insertion portion 12 or the like is curved, the coil 58 is prevented from riding up onto the connection region W1A, and the diameter of the connection region W1A is prevented from becoming thicker. As a result, buckling and thickening of the first tube base end 54 of the distal tube 50 are prevented.

[others]
In the above embodiment, the spiral groove 56 is formed over the entire area of the first tube outer surface 50a of the first tube base end 54, but an area in which the spiral groove 56 is not formed may be provided in a portion of this first tube outer surface 50a.

In the above embodiment, the coil 58 is wound around the spiral groove 56 formed on the first tube outer surface 50a of the distal tube 50, but the method of winding the coil 58 around the first tube outer surface 50a is not limited to the spiral groove 56, and the present invention can also be applied to cases where the coil 58 is wound around the first tube outer surface 50a by a method other than the spiral groove 56.

In the above embodiment, the first tube base end 54 of the tip side tube 50 and the second tube tip end 62 of the base end side tube 60 are each fitted and connected to the connecting pipe 70, but the method of connecting the first tube base end 54 and the second tube tip end 62 to the connecting pipe 70 is not particularly limited.

In the above embodiment, the insertion section 12 is provided with a passive bending section 31, but the present invention can also be applied to a case where the insertion section 12 does not have a passive bending section 31 and the flexible section 30 is directly connected to the base end of the bending section 32.

In the above embodiment, the second tube outer surface 60a of the base end tube 60 is formed as a smooth surface, but as with the tip end tube 50, a spiral groove 56 may be formed on at least a portion of the second tube outer surface 60a, and the coil 58 may be wound around at least a portion of this spiral groove 56. Furthermore, in this case, the second tube tip 62 may be formed in a similar structure to the first tube base end 54. That is, the second tube tip 62 has a spiral groove 56 formed on the second tube outer surface 60a from the tip side to the base end side, and a base end connection region and a base end non-connection region are provided in which the spiral groove 56 is not wound around the spiral groove 56 (not shown).

The base-end connection region corresponds to the connection region W1A and is externally connected to the pipe base end 74. The base-end non-connection region corresponds to the non-connection region W1B and is located closer to the base end than the base-end connection region (pipe base end 74). This prevents buckling and thickening of the second tube tip 62 of the base-end tube 60 for the same reasons as the tip tube 50.

In the above embodiment, the treatment tool insertion tube 23 was used as an example of an endoscope tube according to the present invention, but the present invention can be applied to various tubes (channels) that are inserted into the insertion section 12.

In the above embodiment, a bronchoscope, which is particularly required to have a small diameter, was used as an example of the endoscope of the present invention, but the present invention can be applied to various endoscopes in which an endoscopic tube is inserted into various insertion parts, such as ultrasonic endoscopes and digestive endoscopes.

1...endoscope 10...operation section 12...insertion section 14...universal cord 16...angle lever 22...suction button 23...treatment tool insertion tube 24...treatment tool introduction port 25...treatment tool introduction section 30...flexible section 31...passive bending section 32...bending section 34...tip section main body 34a...tip surface 40...observation window 42...illumination window 44...treatment tool outlet 50...tip side tube 50a...first tube outer surface 52...first tube tip section 54...first tube Base end 56...spiral groove 58...coil 60...base end tube 60a...second tube outer surface 62...second tube tip 70...connecting pipe 70a...pipe outer surface 72...pipe tip 74...pipe base end 76...flange 78...pipe inner surface 78a...tip side expanded diameter surface 78b...base side expanded diameter surface C...ellipse W1...non-wrapped region W1A...connected region W1B...non-connected region W2...coil wrapped region WA...curved portion area WB...flexible portion area

Claims (10)

An endoscope tube to be inserted into an insertion portion of an endoscope,
A distal tube;
a coil wound around at least a portion of a first tube outer surface, which is an outer surface of the distal tube;
A proximal tube;
a connecting pipe that connects the distal end tube and the proximal end tube;
Equipped with
the distal tube has a tube base end located closer to the proximal end of the distal tube than the proximal end of the coil,
An endoscope tube having a connection region where the base end of the tube is connected to the connection pipe and in contact with the connection pipe, and a non-connection region located on the tip side of the tip tube relative to the connection pipe. A spiral groove is formed on at least a portion of the outer surface of the first tube,
the coil is wound around at least a portion of the groove on the distal end side of the distal tube relative to the proximal end of the tube;
2. The endoscope tube according to claim 1, wherein the groove is formed on an outer surface of the first tube at the proximal end of the tube. A flange protruding radially outward from the connection pipe is provided on the outer pipe surface, which is the outer surface of the connection pipe,
2. The endoscope tube according to claim 1, wherein a base end of the tube base end portion and a tip end of the proximal tube are in contact with the flange. a tip end expanding surface formed on an inner surface of a pipe tip end portion, which is a tip end portion of the connection pipe, and expanding an inner diameter of the pipe tip end portion toward a tip side of the pipe tip end portion;
a base end side expanding diameter surface formed on an inner surface of a base end portion of the connecting pipe, the base end portion expanding an inner diameter of the base end portion of the pipe toward the base end side of the base end portion of the pipe;
The endoscope tube according to claim 1 , further comprising at least one of the following: The endoscope tube according to claim 1, wherein the outer surface of the second tube, which is the outer surface of the base end tube, is a smooth surface. The endoscope tube according to claim 1, wherein the length of the non-connected region is 40 mm to 60 mm. the proximal tube has a tube tip portion connected to the connecting pipe,
2. The endoscope tube according to claim 1, wherein the coil has an outer diameter smaller than the outer diameter of at least one of the tube base end and the tube tip end. an insertion section having a bending section and a soft section connected to the bending section;
The endoscope tube according to claim 1 , which is inserted into the insertion portion;
An endoscope comprising: The distal tube is disposed within the curved portion,
The endoscope according to claim 8 , wherein the proximal tube and the connecting pipe are disposed within the flexible portion. The endoscope according to claim 9, wherein the connection pipe is disposed between 200 mm and 400 mm from the tip of the insertion section.

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