Hose for endoscope and endoscope

Abstract

The utility model provides a hose for an endoscope and the endoscope, wherein the hose for the endoscope can prevent a hose on the front end side from buckling and increasing the diameter. A hose for an endoscope is provided with: a tip-side hose (50); a coil (58) wound around at least a part of a first hose outer surface (50a), which is the outer surface of the tip-side hose (50); a base end-side hose (60); and a connection tube (70) that connects the tip-side hose (50) and the base-end-side hose (60), the tip-side hose (50) having a hose base end section (first hose base end section (54)) positioned closer to the base end side of the tip-side hose (50) than the base end of the coil (58). The hose base end portion has a connection region (W1A) that is connected to the connection tube (70) and that is in contact with the connection tube (70), and a non-connection region (W1B) that is positioned closer to the tip side of the tip-side hose (50) than the connection tube (70).

Description

Technical Field

[0001] The utility model relates to an endoscope hose inserted into an insertion portion of an endoscope and an endoscope provided with the endoscope hose. Background Art

[0002] Various endoscopes such as bronchoscopes and ultrasonic endoscopes are used in the medical field. The endoscope includes an insertion portion and an operating portion that is inserted into a subject. In such an endoscope, various treatment instruments are introduced from a treatment instrument introduction port provided in the operating portion, and the treatment instruments are led out from a treatment instrument lead-out port opened at the front end of the insertion portion to the outside for treatment. In addition, an endoscope hose such as a treatment instrument insertion hose (also called a channel) for inserting treatment instruments is inserted into the interior of the insertion portion of the endoscope.

[0003] Patent Documents 1 to 4 describe that, in order to prevent an endoscope tube from buckling when an insertion portion is bent, a spiral groove is formed on a portion of the outer surface of the endoscope tube and a coil is wound around the spiral groove.

[0004] Here, Patent Document 4 describes the following method: In order to manufacture an endoscope hose easily and with high precision, the endoscope hose is composed of two hoses, a front end hose and a base end hose, and the front end hose and the base end hose are connected with a connecting tube, thereby manufacturing the endoscope hose.

[0005] The base end of the front end side hose described in Patent Document 4 has a connection area externally connected to the front end side of the connection pipe and a coil winding area wound with a coil. The connection area is a non-winding area provided at the base end of the front end side hose closest to the base end side and not wound with a coil. The coil winding area is provided continuously with the front end side of the connection area. Thus, on the outer surface of the base end of the front end side hose, the coil is wound to the nearest position of the connection area externally connected to the connection pipe.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2017-000330

[0007] Patent Document 2: Japanese Patent Application Publication No. 2009-247413

[0008] Patent Document 3: Japanese Patent Application Publication No. 2008-229067

[0009] Patent Document 4: International Publication No. 2013 / 088791

[0010] In the endoscope hose described in Patent Document 4, when the coil is wound around the outer surface of the base end of the front end hose, the coil is wound to the nearest position of the connection area. Therefore, there may be a situation where, when the bending portion of the insertion portion is bent according to the bending operation of the operating portion, stress is concentrated at the nearest position of the connection area (the boundary between the connection area and the coil winding area) according to the position of the connection area in the insertion portion, resulting in buckling. In addition, there may be a situation where the outer diameter of the connection area is increased by multiplying the coil by the connection area. Utility Model Content

[0011] The present invention has been made in view of such a situation, and an object of the present invention is to provide an endoscope hose and an endoscope capable of preventing the front end side hose from buckling and increasing in diameter.

[0012] The first embodiment of the utility model relates to an endoscope hose, which is inserted into the insertion part of the endoscope and comprises: a front end hose; a coil, which is wound on the outer surface of the front end hose, that is, at least a part of the outer surface of the first hose; a base end hose; and a connecting tube, which connects the front end hose and the base end hose, the front end hose having a hose base end portion located closer to the base end side of the front end hose than the base end of the coil, and the hose base end portion having a connection area connected to the connecting tube and in contact with the connecting tube and a non-connection area located closer to the front end side of the front end hose than the connecting tube.

[0013] According to this endoscope hose, buckling and enlargement of the distal end side hose can be prevented.

[0014] The endoscope hose involved in the second mode of the utility model has a spiral groove formed on at least a portion of the outer surface of the first hose in the first mode, the coil is wound around at least a portion of the groove on the front end side of the hose closer to the front end side than the base end of the hose, and a groove is formed on the outer surface of the first hose at the base end of the hose.

[0015] The endoscope hose according to the third aspect of the utility model is provided with a flange protruding radially outwardly of the connecting tube on the outer surface of the connecting tube, i.e., the outer surface of the tube, in the first aspect or the second aspect, and the base end of the hose base end portion and the front end of the base end side hose abut against the flange. Thus, when the hose base end portion and the base end side hose are connected to the connecting tube, the position of the base end of the hose base end portion and the position of the front end of the base end side hose can be positioned.

[0016] The endoscope hose according to the fourth aspect of the present invention is provided with at least one of a front end side diameter expansion surface and a base end side diameter expansion surface in any one of the first to third aspects, wherein the front end side diameter expansion surface is formed on the inner surface of the front end portion of the connecting tube, i.e., the tube front end portion, and expands the inner diameter of the tube front end portion toward the front end side of the tube front end portion, and the base end side diameter expansion surface is formed on the inner surface of the base end portion of the connecting tube, i.e., the tube base end portion, and expands the inner diameter of the tube base end portion toward the base end side of the tube base end portion. Thus, the step difference between the inner surface of the front end side hose and the inner surface of the connecting tube can be reduced, or the step difference between the inner surface of the base end side hose and the inner surface of the connecting tube can be reduced.

[0017] The endoscope tube according to a fifth aspect of the present invention is any one of the first to fourth aspects, wherein the outer surface of the proximal end side tube, that is, the second tube outer surface is a smooth surface.

[0018] In the endoscope tube according to a sixth aspect of the present invention, in any one of the first to fifth aspects, the length of the non-connection region is 40 mm to 60 mm.

[0019] The endoscope hose according to the seventh aspect of the present invention is one of the first to sixth aspects, wherein the proximal hose has a hose front end connected to the connection pipe, and the outer diameter of the coil is smaller than the outer diameter of at least one of the proximal hose and the hose front end. This prevents the front end hose around which the coil is wound from becoming thicker.

[0020] An endoscope according to an eighth aspect of the present invention comprises: an insertion portion having a bending portion and a flexible portion connected to the bending portion; and an endoscope hose according to any one of the first to seventh aspects, which is inserted into the insertion portion.

[0021] In the endoscope according to a ninth aspect of the present invention, in the eighth aspect, the distal end side tube is arranged in the bending portion, and the proximal end side tube and the connecting tube are arranged in the flexible portion.

[0022] In the endoscope according to a tenth aspect of the present invention, in the eighth aspect or the ninth aspect, the connection tube is arranged at a position between 200 mm and 400 mm from the distal end of the insertion portion.

[0023] Utility Model Effect

[0024] The utility model can prevent the front end side hose from being buckled and enlarged in diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an overall picture of an endoscope.

[0026] Figure 2 It is a perspective view of the front end body.

[0027] Figure 3 It is a side view of the treatment device insertion hose.

[0028] Figure 4 yes Figure 3 An enlarged view of the portion indicated by the oval C of the treatment instrument insertion hose.

[0029] Figure 5 This is an exploded view of the disposal device insertion hose.

[0030] Figure 6 This is an enlarged view of the connecting pipe.

[0031] Figure 7 This is an enlarged cross-sectional view of the connecting pipe.

[0032] Figure 8 This is an enlarged view of the base end portion of the first hose.

[0033] Explanation of symbols:

[0034] 1-endoscope, 10-operating part, 12-insertion part, 14-universal cord, 16-angle rod, 22-suction button, 23-treatment instrument insertion hose, 24-treatment instrument introduction port, 25-treatment instrument introduction part, 30-soft part, 31-passive bending part, 32-bending part, 34-front end body, 34a-front end surface, 40-observation window, 42-illumination window, 44-treatment instrument lead-out port, 50-front end side hose, 50a-outer surface of the first hose, 52-front end of the first hose, 54-first soft Tube base end, 56-spiral groove, 58-coil, 60-base end side hose, 60a-outer surface of the second hose, 62-front end of the second hose, 70-connecting tube, 70a-outer surface of the tube, 72-front end of the tube, 74-base end of the tube, 76-flange, 78-inner surface of the tube, 78a-front end side expanded diameter surface, 78b-base end side expanded diameter surface, C-ellipse, W1-non-winding area, W1A-connecting area, W1B-non-connecting area, W2-coil winding area, WA-bending portion range, WB-soft portion range. DETAILED DESCRIPTION

[0035] [Overall structure of the endoscope]

[0036] Figure 1 is an overall view of the endoscope 1. Figure 1 As shown, the endoscope 1 is, for example, a bronchoscope, which is used to observe the trachea, bronchi and lungs (which may also be lesions, inspection sites or diagnosis sites) and collect cell tissues. Regarding the bronchoscope, it is required to be thinner than the digestive endoscope in terms of its use site, even if it has a treatment instrument insertion hose 23 (reference Figure 3) bronchoscope, a bronchoscope in which the outer diameter of the front end body 34 is 4mm to 6mm and the outer diameter of the soft part 30 is 4mm to 7mm can also be used.

[0037] The endoscope 1 includes an operation portion 10 for the surgeon to hold and perform various operations, an insertion portion 12 to be 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.

[0038] The operation portion 10 is provided with various operation components operated by the surgeon, for example, an angle lever 16 and a suction button 22 .

[0039] Furthermore, a treatment instrument introduction section 25 is provided in the operation section 10. The treatment instrument introduction section 25 is provided with a treatment instrument insertion hose 23 (see FIG. 1 ) for inserting a treatment instrument (omitted from the illustration, the same below) into the insertion section 12. Figure 3 ) is introduced into the disposal instrument 24.

[0040] The insertion portion 12 extends from the front end of the operation portion 10 and is formed in a thin and elongated shape as a whole. The insertion portion 12 is composed of a soft portion 30, a passive bending portion 31, a bending portion 32, and a front end body 34 in order from the base end side toward the front end side.

[0041] The soft part 30 occupies most of the insertion part 12 from the base end side, and is composed of, for example, a metal spiral tube (a metal plate wound in a spiral shape) and a mesh (not shown), and is further composed of a resin covering their outer periphery. The soft part 30 has flexibility that can be bent in any direction, and when the insertion part 12 is inserted into the body cavity, it bends along the insertion path into the body cavity.

[0042] The passive bending portion 31 is composed of, for example, a metal spiral tube (a metal plate wound in a spiral shape) and a mesh (not shown), and is covered with an angled rubber (not shown) together with the bending portion 32 described later. The passive bending portion 31 is more flexible than the soft portion 30 so that it can bend passively in response to an external force, and when the insertion portion 12 is inserted into the body cavity, it bends along the insertion path into the body cavity in the same manner as the soft portion 30.

[0043] The bending portion 32 is formed by connecting a plurality of bending members (not shown), for example, and is an active bending portion that can be actively bent in the vertical direction (direction A2) by rotating the angle lever 16 of the operating portion 10 in the direction A1. By bending the bending portion 32, the front end body 34 can be directed to a desired direction. In addition, a pair of angle knobs can be provided instead of the angle lever 16, and the bending portion 32 can be bent in the vertical direction and the left-right direction by rotating the pair of angle knobs.

[0044] Figure 2 3 is a perspective view of the front end body 34. Figure 2 As shown, an observation window 40, a pair of lighting windows 42, and a treatment tool guide 44 are provided on the front end surface 34a of the front end body 34. Although not shown in the figure, an observation optical system composed of a lens and the like and an imaging unit composed of an imaging element and the like are provided inside the front end body 34, behind the observation window 40. The imaging unit captures the observation part through the observation optical system and outputs a signal of the observation image.

[0045] Inside the front end body 34 , emission ends of light guides (not shown) are respectively arranged behind the pair of lighting windows 42 .

[0046] The treatment tool lead-out 44 is led out from the treatment tool lead-in 24 and inserted into the treatment tool insertion hose 23 (see Figure 3 ) in the disposal equipment.

[0047] return Figure 1 Although not shown in the figure, the universal cord 14 contains a signal cable connected to the imaging element of the above-mentioned observation optical system and the above-mentioned light guide, etc. A connector is provided at the end of the universal cord 14, which is not shown in the figure. The connector is connected to a specified system component device such as a processor device and a light source device that constitute the endoscope system. Thus, the power, control signal, illumination light, etc. required for the operation of the endoscope 1 are supplied from the system component device to the endoscope 1. In addition, the signal of the observation image acquired by the observation optical system is transmitted from the endoscope 1 to the system structure device (processor device). In addition, the signal transmitted to the system structure device is subjected to image processing, and the observation image of the observation part is displayed on a monitor, which is not shown in the figure. In addition, the illumination light is supplied from the system structure device (light source device) to the light guide, and the illumination light is irradiated to the observation part from a pair of illumination windows 42.

[0048] In addition, the structure of the operation part 10 and the front end body 34 is not particularly limited to Figure 1 and Figure 2 The illustrated embodiment can be modified into various structures adopted in known bronchoscopes.

[0049] [Disposal equipment insertion hose]

[0050] Figure 3 It is a side view of the treatment instrument insertion hose 23. Figure 4 yes Figure 3 An enlarged view of the portion indicated by the oval C of the treatment instrument insertion hose 23 in FIG. Figure 5 It is an exploded view of the treatment instrument insertion hose 23 .

[0051] like Figures 3 to 5As shown in FIG. 1 , the treatment instrument insertion hose 23 (also referred to as the treatment instrument insertion channel) is a resin hose equivalent to the endoscope hose of the present invention, and is connected to the treatment instrument outlet 44 via the treatment instrument inlet 24 and a known branch portion (not shown), and guides the treatment instrument inserted into the treatment instrument inlet 24 to the treatment instrument outlet 44. Figure 3 and Figure 4 In FIG. 1 , symbol WA denotes a bending portion range indicating the range of the passive bending portion 31 and the bending portion 32 in the insertion portion 12 , and symbol WB denotes a flexible portion range indicating the range of the flexible portion 30 in the insertion portion 12 .

[0052] The treatment instrument insertion hose 23 is composed of a distal hose 50, a coil 58 wound (wound) around the outer surface of the distal hose 50, a proximal hose 60, and a connecting tube 70. Figure 3 In order to avoid complicating the drawing, the coil 58 is omitted.

[0053] The front end side hose 50 is arranged in the bending portion range WA, that is, arranged in the bending portion 32 and the passive bending portion 31. The front end side hose 50 is, for example, a PTFE (polytetrafluoroethylene) hose. In addition, here, the passive bending portion 31 is also included in the "bending portion" of the present utility model. In addition, it is not necessary to arrange the entire front end side hose 50 in the bending portion range WA, and a part of the front end side hose 50 (for example, the first hose base end portion 54 described later) may be arranged in the soft portion range WB, that is, the soft portion 30.

[0054] The distal end side hose 50 includes a first hose distal end portion 52 connected to the treatment instrument outlet 44 and a first hose proximal end portion 54 (corresponding to the proximal end portion of the hose in the present invention) connected to the distal end side of a connection tube 70 described later.

[0055] The outer surface of the front end side hose 50, that is, the first hose outer surface 50a (refer to Figure 4 The spiral groove 56, which is a spiral groove for winding the coil 58, is formed in the entire area (including almost the entire area) of the first hose outer surface 50a. In addition, the spiral groove 56 may be formed in a portion of the first hose outer surface 50a instead of the entire area of ​​the first hose outer surface 50a. That is, the spiral groove 56 only needs to be formed in at least a portion of the first hose outer surface 50a.

[0056] The coil 58 is wound around the spiral groove 56 formed on the outer surface 50a of the first hose at the front end portion 52 of the first hose. Thus, in the outer surface 50a of the first hose of the front end side hose 50, the coil 58 is wound around the entire region (including almost the entire region) that is closer to the front end side than the base end 54 of the first hose. In other words, the base end 54 of the first hose is located closer to the base end side of the front end side hose 50 than the base end of the coil 58. In addition, the coil 58 may be wound around a portion of the spiral groove 56 instead of the entire spiral groove 56. That is, the coil 58 only needs to be wound around at least a portion of the spiral groove 56 that is closer to the front end side than the base end 54 of the first hose. The coil 58 prevents the front end side hose 50 from buckling when the bending portion 32 and the passive bending portion 31 are bent. In addition, the base end portion 54 of the first hose will be described later (refer to the later described). Figure 8 ).

[0057] The outer diameter of the coil 58 is smaller than at least one of the outer diameter of the first hose proximal end portion 54 and the outer diameter of the second hose distal end portion 62 of the proximal hose 60 described later. This prevents the distal hose 50 around which the coil 58 is wound from becoming larger in diameter.

[0058] The base end hose 60 is arranged in the soft part range WB, that is, arranged in the soft part 30. The base end hose 60 is, for example, a PTFE (polytetrafluoroethylene) hose. The base end hose 60 has a second hose front end portion 62 connected to the base end side of the connecting tube 70 and a second hose base end portion (not shown) connected to the treatment instrument introduction port 24.

[0059] The outer surface of the proximal tube 60, that is, the second tube outer surface 60a, is a smooth surface. The smooth surface here refers to a surface on which the spiral groove 56 for winding the coil 58 is not formed.

[0060] The connection tube 70 is arranged in the flexible portion range WB, that is, arranged in the flexible portion 30. Moreover, in the present embodiment, the connection tube 70 is arranged in the flexible portion 30 at a position between 200 mm and 400 mm from the front end (front end surface 34a) of the insertion portion 12. The connection tube 70 connects the front end side hose 50 and the base end side hose 60.

[0061] Figure 6 It is an enlarged view of the connecting pipe 70. Figure 7 FIG. 7 is an enlarged cross-sectional view of the connecting pipe 70. Figures 5 to 7 As shown, the connection pipe 70 includes a pipe front end portion 72 on which the first hose base end portion 54 is externally fitted and connected, and a pipe base end portion 74 on which the second hose front end portion 62 is externally fitted and connected.

[0062] Since the outer diameter of the tube front end portion 72 is slightly larger than the inner diameter of the first hose base end portion 54, when the first hose base end portion 54 is externally fitted and connected to the tube front end portion 72, the first hose base end portion 54 is enlarged in diameter by the tube front end portion 72. Similarly, since the outer diameter of the tube base end portion 74 is slightly larger than the inner diameter of the second hose front end portion 62, when the second hose front end portion 62 is externally fitted and connected to the tube base end portion 74, the second hose front end portion 62 is enlarged in diameter by the tube base end portion 74.

[0063] The first hose proximal end portion 54 and the tube distal end portion 72 are fixed by an adhesive (eg, epoxy resin) not shown. Similarly, the second hose distal end portion 62 and the tube proximal end portion 74 are also fixed by an adhesive.

[0064] A flange 76 is provided on the outer surface of the connection tube 70, that is, the tube outer surface 70a, which protrudes radially outward from the connection tube 70. The base end of the first hose base end 54 externally fitted and connected to the tube front end 72 and the front end of the second hose front end 62 externally fitted and connected to the tube base end 74 abut against the flange 76. Thus, the base end of the first hose base end 54 and the front end of the second hose front end 62 can be positioned. In addition, a gap for filling the above-mentioned adhesive can be provided between the base end of the first hose base end 54 and the flange 76, and between the front end of the second hose front end 62 and the flange 76.

[0065] The inner surface of the connecting tube 70, namely the tube inner surface 78, is formed with a front end side expanded diameter surface 78a and a base end side expanded diameter surface 78b (see Figure 7 ).

[0066] The front end side expanded diameter surface 78a is the tube inner surface 78 of the tube front end portion 72, and is a tapered surface that gradually expands the inner diameter of the tube front end portion 72 toward the front end side of the tube front end portion 72. In addition, the base end side expanded diameter surface 78b is the tube inner surface 78 of the tube base end portion 74, and is a tapered surface that gradually expands the inner diameter of the tube base end portion 74 toward the base end side of the tube base end portion 74.

[0067] By forming the front end side expanded diameter surface 78a, the step difference generated between the inner surface of the first hose base end portion 54 and the inner surface of the tube front end portion 72 (front end side expanded diameter surface 78a) at the connection portion between the first hose base end portion 54 and the tube front end portion 72 is reduced. In addition, by forming the base end side expanded diameter surface 78b, the step difference generated between the inner surface of the tube base end portion 74 (base end side expanded diameter surface 78b) and the inner surface of the second hose front end portion 62 at the connection portion between the tube base end portion 74 and the second hose front end portion 62 is reduced. Thus, when the front end portion of the treatment tool inserted into the treatment tool insertion hose 23 passes through the connecting tube 70, the front end portion of the treatment tool is prevented from being stuck by these step differences. As a result, the front end portion of the treatment tool in the treatment tool insertion hose 23 can be smoothly moved.

[0068] In addition, in the present embodiment, both the front end side expanded diameter surface 78a and the base end side expanded diameter surface 78b are formed on the tube inner surface 78, but only one of them may be formed. Furthermore, as long as the smooth movement of the front end portion of the treatment instrument is not hindered, the front end side expanded diameter surface 78a and the base end side expanded diameter surface 78b may include a portion without a change in the inner diameter or be formed in a curved surface shape.

[0069] [First hose base end portion]

[0070] Figure 8 FIG. 5 is an enlarged view of the first hose base end portion 54. Figure 8 As shown, the first hose base end portion 54 has a non-wrap region W1. The non-wrap region W1 is a region where the spiral groove 56 is formed on the first hose outer surface 50a but the coil 58 is not wound around the spiral groove 56. The non-wrap region W1 includes a connection region W1A and a non-connection region W1B.

[0071] The connection region W1A is a region on the most proximal side of the first hose proximal end portion 54 , and is externally fitted and connected to the tube distal end portion 72 and in contact with the tube distal end portion 72 .

[0072] The non-connection region W1B is a region that is provided continuously with the front end side of the connection region W1A and is located at a position closer to the front end side than the tube front end portion 72. The length of the non-connection region W1B is, for example, 40 mm to 60 mm. In addition, the coil winding region W2 is provided continuously with the front end side of the non-connection region W1B, that is, the front end side of the first hose base end portion 54. The coil winding region W2 is a region where the coil 58 is wound on the spiral groove 56 formed on the outer surface 50a of the first hose.

[0073] Here, when the non-connection area W1B is not provided at the front end side of the connection area W1A, that is, when the coil 58 is wound to the closest position of the connection area W1A relative to the first hose outer surface 50a of the first hose base end portion 54, stress may be concentrated at the closest position when the bending portion 32 of the insertion portion 12 is bent, causing buckling. In addition, the outer diameter of the connection area W1A may increase due to the multiplication of the coil 58 by the connection area W1A.

[0074] In contrast, in the present embodiment, by providing a non-connection area W1B on the front end side of the connection area W1A where the coil 58 is not wound, when the bending portion 32 of the insertion portion 12 is bent, the stress is not concentrated at the closest position mentioned above but is dispersed in the entire non-connection area W1B, thereby preventing the first hose base end 54 from buckling. Furthermore, the buckling prevention effect is also affected by the configuration of the non-winding area W1. Here, as described above, the first hose base end 54 (non-winding area W1) can be configured in the soft portion 30, so compared with configuring the non-winding area W1 in the bending portion 32 with a small curvature radius, by configuring it in the soft portion 30 with a large curvature radius, the buckling prevention effect is further obtained. Furthermore, since the coil 58 is prevented from multiplying the connection area W1A when the bending portion 32 of the insertion portion 12 is bent, the connection area W1A is prevented from being enlarged. As a result, the buckling and enlargement of the first hose base end 54 of the front end side hose 50 are prevented.

[0075] [other]

[0076] In the above embodiment, the spiral groove 56 is formed on the entire first hose outer surface 50a of the first hose proximal end portion 54, but a region where the spiral groove 56 is not formed may be provided in a partial region of the first hose outer surface 50a.

[0077] In the above-mentioned embodiment, the coil 58 is wound on the spiral groove 56 formed on the first hose outer surface 50a of the front end side hose 50, but the method of winding the coil 58 on the first hose outer surface 50a is not limited to the spiral groove 56. The present invention can also be applied when the coil 58 is wound on the first hose outer surface 50a using other methods other than the spiral groove 56.

[0078] In the above embodiment, the first hose base end portion 54 of the front end side hose 50 and the second hose front end portion 62 of the base end side hose 60 are respectively externally connected to the connecting tube 70, but the connection method of the first hose base end portion 54 and the second hose front end portion 62 to the connecting tube 70 is not particularly limited.

[0079] In the above embodiment, the passive bending portion 31 is provided in the insertion portion 12 . However, the present invention can also be applied when the passive bending portion 31 is not provided in the insertion portion 12 and the soft portion 30 is directly connected to the proximal end of the bending portion 32 .

[0080] In the above embodiment, the second hose outer surface 60a of the base end hose 60 is formed as a smooth surface, but the spiral groove 56 may be formed on at least a portion of the second hose outer surface 60a, and the coil 58 may be wound around at least a portion of the spiral groove 56, as in the case of the front end hose 50. In this case, the second hose front end portion 62 may be formed into the same structure as the first hose base end portion 54. That is, the base end side connection region and the base end side non-connection region (not shown) are provided in the second hose front end portion 62 from the front end side toward the base end side, where the spiral groove 56 is formed on the second hose outer surface 60a but the coil 58 is not wound around the spiral groove 56.

[0081] The base end side connection area is an area corresponding to the connection area W1A, and is externally connected to the tube base end portion 74. The base end side non-connection area is an area corresponding to the non-connection area W1B, and is located closer to the base end side than the base end side connection area (tube base end portion 74). Thus, for the same reason as the front end side hose 50, the second hose front end portion 62 of the base end side hose 60 is prevented from buckling and increasing in diameter.

[0082] In the above-described embodiment, the treatment instrument insertion tube 23 is described as an example of the endoscope tube of the present invention, but the present invention can be applied to various tubes (channels) inserted into the insertion portion 12 .

[0083] In the above-mentioned embodiment, as the endoscope of the present invention, a bronchoscope which particularly needs to be thin in diameter is described as an example, but the present invention can be applied to various endoscopes having an endoscope tube inserted in various insertion portions such as an ultrasonic endoscope and a digestive endoscope.

Claims

1. An endoscope hose, inserted into an insertion portion of an endoscope, characterized in that: The endoscope hose comprises: Front side hose; A coil wound around at least a portion of the outer surface of the front end side hose, that is, the outer surface of the first hose; a proximal end side hose; and a connecting tube connecting the distal end side hose and the proximal end side hose, The front end side hose has a hose proximal end portion located closer to the proximal end side of the front end side hose than the proximal end of the coil. The hose base end portion includes a connection region connected to and in contact with the connection pipe and a non-connection region located closer to the front end side of the front end side hose than the connection pipe.

2. The endoscope hose according to claim 1, characterized in that: A spiral groove is formed on at least a portion of the outer surface of the first hose. The coil is wound around at least a portion of the groove on the front end side of the front end side hose relative to the hose base end portion. The groove is formed on the outer surface of the first hose at the base end portion of the hose.

3. The endoscope hose according to claim 1 or 2, characterized in that: A flange protruding radially outward from the connecting pipe is provided on the outer surface of the connecting pipe, that is, the outer surface of the pipe. The proximal end of the hose proximal end portion and the distal end of the proximal end side hose abut against the flange.

4. The endoscope hose according to claim 1 or 2, characterized in that: The endoscope tube includes at least one of a front end side expanded diameter surface and a base end side expanded diameter surface. The front end side diameter expansion surface is formed on the front end portion of the connecting pipe, that is, the inner surface of the front end portion of the pipe, and expands the inner diameter of the front end portion of the pipe toward the front end side of the front end portion of the pipe. The proximal end side diameter expansion surface is formed on the inner surface of the proximal end portion of the connecting tube, that is, the tube proximal end portion, and expands the inner diameter of the tube proximal end portion toward the proximal end side of the tube proximal end portion.

5. The endoscope hose according to claim 1, characterized in that: The outer surface of the proximal end side tube, that is, the second tube outer surface, is a smooth surface.

6. The endoscope hose according to claim 1 or 2, characterized in that: The length of the non-connected area is 40 mm to 60 mm.

7. The endoscope hose according to claim 1 or 2, characterized in that: The base end side hose has a hose front end portion connected to the connection pipe, The outer diameter of the coil is smaller than the outer diameter of at least one of the hose base end portion and the hose front end portion.

8. An endoscope, characterized in that: The endoscope comprises: An insertion portion having a curved portion and a soft portion connected to the curved portion; and The endoscope tube according to any one of claims 1 to 7 is inserted into the insertion portion.

9. The endoscope according to claim 8, characterized in that The front end side hose is arranged in the curved portion, The proximal end side hose and the connecting tube are arranged in the flexible portion.

10. The endoscope according to claim 9, characterized in that The connecting pipe is arranged at a position between 200 mm and 400 mm from the front end of the insertion portion.

Images