JP2017000330A - Insertion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insertion device capable of reducing the diameter of a built-in object by inhibiting protrusion of a tube to the outside, with the tube fixed to any position relative to the outer periphery of a cylindrical member, improving assemblability when the tube is fixed to any position relative to the outer periphery of the cylindrical member and, after the tube is disposed relative to the outer periphery of the cylindrical member, capable of retaining the position of the tube relative to the outer periphery of the cylindrical member.SOLUTION: The insertion device includes: an insertion part to be inserted toward an object; a cylindrical member disposed in the insertion part; a tube for covering the outer periphery of an end of the cylindrical member in the insertion part and having flexibility; a groove formed around the outer periphery of a part, out of the tube, for covering the cylindrical member; and a fastening part disposed at the groove for fastening the tube to the cylindrical member by the elastic force.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an insertion device that is inserted into a tube hole.

  For example, a built-in object in which a tube is fitted and fixed to the outer periphery of a cylindrical member, such as being used as a channel, is disposed inside an insertion portion of an insertion device such as an endoscope of Patent Document 1. When fixing a tube with respect to a cylindrical member, after binding the tube arrange | positioned on the outer periphery of a cylindrical member with the thread | yarn from the outer side, the adhesive agent is apply | coated to the thread | yarn.

JP 2012-110426 A

Since a built-in object in which a tube is fitted on the outer periphery of a cylindrical member as disclosed in Patent Document 1 binds a thread to the outside of the tube, a bulge is generated on the outside of the tube. On the other hand, the built-in material is required to be reduced in diameter as much as possible while maintaining the strength and inner diameter of the cylindrical member and the tube, and to be easily placed in a narrow tube inside the flexible tube or the bending tube of the insertion portion.
When the tube is fixed at an appropriate position with respect to the outer periphery of the cylindrical member, the outer side of the tube is bound with a thread while the tube is positioned on the outer periphery of the cylindrical member. In this case, since the cylindrical member and the tube have a small diameter, and the yarn is further extremely small in diameter, a fine work is required. Further, it is also necessary to apply a fine work after the outer side of the tube is fastened with a thread and fixed to the cylindrical member.

  This invention can suppress the protrusion to the outside of the tube with the tube fixed at an appropriate position with respect to the outer periphery of the cylindrical member, and can reduce the internal diameter of the tube. On the other hand, it is possible to improve the assembly property when fixing the tube to an appropriate position, and after arranging the tube with respect to the outer periphery of the cylindrical member, the position of the tube with respect to the outer periphery of the cylindrical member is changed. It is an object to provide a maintainable insertion device.

  The insertion device according to one aspect of the present invention covers an outer periphery of an end portion of the cylindrical member in the insertion portion, an insertion portion that is inserted toward the target, a cylindrical member that is disposed in the insertion portion, A tube having flexibility, a groove formed around an axis on an outer periphery of a portion of the tube that covers the cylindrical member, and an elastic force disposed on the groove, the tube being elastic with respect to the cylindrical member And a fastening portion to be fastened.

  According to the present invention, the fastening portion is disposed in the groove, so that the protrusion to the outside of the tube is suppressed and the built-in object is reduced in diameter in a state where the tube is fixed at an appropriate position with respect to the outer periphery of the cylindrical member. It is possible to improve the assembly when fixing the tube at an appropriate position with respect to the outer periphery of the cylindrical member, and after arranging the tube with respect to the outer periphery of the cylindrical member, An insertion device capable of maintaining the position of the tube with respect to the outer periphery of the cylindrical member can be provided.

FIG. 1A is a schematic view showing an endoscope as an insertion device according to the first to fourth embodiments, and FIG. 1B shows a state observed from the direction of arrow 1B in FIG. It is a schematic perspective view shown. FIG. 2 is a schematic longitudinal sectional view showing the vicinity of the distal end portion of the insertion portion of the insertion device according to the first to fourth embodiments. FIG. 3A is a schematic view showing a connection structure of pipes and tubes forming a channel of the insertion device according to the first embodiment, and FIG. 3B is a schematic view of the connection structure shown in FIG. 3 (C) is a schematic enlarged view of a position indicated by reference numeral 3C in FIG. 3 (B), and FIG. 3 (D) is indicated by reference numeral 3D in FIG. 3 (B). It is a schematic enlarged view of the position shown. FIG. 4A is a schematic longitudinal sectional view showing a connecting structure of a pipe and a tube forming a channel of an insertion device according to a modification of the first embodiment, and FIG. 4B is a diagram of FIG. FIG. 4C is a schematic longitudinal sectional view showing a pipe and tube connection structure according to a first modification of the first embodiment, in which a portion indicated by reference numeral 4B in the figure is enlarged. FIG. It is a schematic longitudinal cross-sectional view which shows the connection structure of the pipe and tube which concern on the 2nd modification of 1st Embodiment which expanded the part shown by the code | symbol 4C in the inside. FIG. 5A is a schematic view showing a connection structure of pipes and tubes forming a channel of the insertion device according to the second embodiment, and FIG. 5B is a schematic view of the connection structure shown in FIG. FIG. FIG. 6 is a schematic view showing a connection structure of a pipe and a tube forming a channel of the insertion device according to the third embodiment. FIG. 7 is a schematic longitudinal sectional view showing a connecting structure of a pipe and a tube forming a channel of an insertion device according to a modification of the third embodiment. FIG. 8 is a schematic longitudinal sectional view showing a connecting structure of a pipe and a tube forming a channel of the insertion device according to the fourth embodiment. FIG. 9 is a schematic longitudinal sectional view showing a connecting structure of a pipe and a tube forming a channel of an insertion device according to a modification of the fourth embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[First Embodiment]
A first embodiment will be described with reference to FIGS. 1A to 3D.
As shown in FIG. 1A, an insertion device 10 according to this embodiment includes an insertion portion 12 as a tubular body that is inserted toward an object such as an observation target in an appropriate duct, and a base of the insertion portion 12. And an operation unit 14 provided at the end.

  The operation unit 14 includes an operation unit main body 22 and a gripping unit 24. The operation section main body 22 is provided with a known bending operation knob 32, a switch section 34 having a plurality of switches, a suction button 36, and an air / water supply button 38, respectively. A universal cord 22 a is provided on the operation unit main body 22. The universal cord 22a is connected to a control device (not shown). For example, if the insertion device 10 is an endoscope, the grip portion 24 is formed in a cylindrical shape that can be gripped by an operator. The grip portion 24 is provided with a base end opening 68b of a channel 68 to be described later for inserting forceps and the like.

  The insertion part 12 has the front-end | tip part 42, the bending part 44, and the flexible tube 46 in order toward the base end from the front-end | tip. A proximal end of the flexible tube 46 is connected to the grip portion 24 via a bend 48.

  As shown in FIG. 1B, the distal end surface 42a of the distal end portion 42 has first passages 52a and 52b, a second passage 54, a third passage 56, and a fourth passage 58. The first passages 52 a and 52 b, the second passage 54, the third passage 56, and the fourth passage 58 penetrate through the insertion portion 12 in the longitudinal direction. The first passages 52a and 52b are formed apart from each other. In the first passages 52a and 52b, an illumination optical system 62 is disposed as a built-in object disposed in the insertion portion 12, respectively. An observation optical system 64 is disposed in the second passage 54 as a built-in object. The third passage 56 has a nozzle 66 a at the tip, and an air / water supply passage 66 is disposed as a built-in object disposed in the insertion portion 12. A channel 68 is formed in the fourth passage 58 as a built-in object disposed in the insertion portion 12. That is, the distal end portion 42 includes an illumination optical system 62, an observation optical system 64, a nozzle 66a that operates according to an operation input to the air / water supply button 38 of the operation unit 14, an air / water supply tube (not shown), and In response to an operation input to the suction button 36, a channel 68 through which a suction function as a distal end opening 68a is performed and an appropriate treatment instrument is inserted is provided.

  As shown in FIG. 2, the bending portion 44 has a plurality of node rings 72 that are rotatably connected in the vertical and horizontal directions, and a metal or a resin strand is knitted on the outer peripheral surface of these node rings 72. It is covered with a mesh tube. The outer peripheral surface of the mesh tube is further covered with a covering tube 74 such as a rubber material. The operation wires 76 are inserted through the annular wire guide 72a on the inner peripheral surface of the node ring 72 in the circumferential direction of the node ring 72 at intervals of about 90 degrees. One end of these operation wires 76 is fixed to a node ring 72 positioned at the forefront of the insertion portion 12, and the other end is operated along the axial direction by the bending operation knob 32 of the operation portion 14.

  As shown in FIGS. 3A and 3B, the channel 68 has a pipe (tubular member) 82, a tube 84, and a biasing force inwardly in the radial direction of the tube 84 with respect to the tube 84. And an urging member (tube reinforcing member) 86 to be applied. The pipe 82, the tube 84, and the urging member 86 are disposed inside the insertion portion 12. The pipe 82 is made of, for example, a metal material such as a stainless steel material or a hard material such as a hard plastic material. The inner peripheral surface 82a of the pipe 82 is preferably coated with an electrical insulation. The tube 84 is formed of a material having electrical insulation and flexibility such as a resin material. In this embodiment, the urging member 86 is preferably formed in a coil shape with a metal material that can be elastically deformed, such as SUS304, or a resin material. Of course, as the urging member 86, a coil-shaped member in which a resin material is coated on the outside of a metal material is preferably used.

  The channel 68 shown in FIG. 2 is fitted to the fourth passage 58 in a state in which one end portion 83a of the pipe 82 is preferably prevented from rotating, for example, bonding or axis in a direction perpendicular to the central axis C of the channel 68. It is fixed by screwing or the like having One end portion 85 a of the channel tube 84 is connected to the other end portion 83 b of the outer peripheral surface 82 b of the pipe 82.

  As shown in FIGS. 3A and 3B, the outer peripheral surface 82 b of the pipe 82 is formed to have a diameter that is substantially the same as or slightly larger than the inner peripheral surface 84 a of the one end portion 85 a including the one end 85 of the tube 84. Has been. For this reason, the inner peripheral surface 84 a of the one end portion 85 a including the one end 85 of the tube 84 is in close contact with the outer peripheral surface 82 b of the pipe 82. That is, the tube 84 covers the outer peripheral surface 82 b of the other end 83 b of the pipe 82 in the insertion portion 12.

  On the outer peripheral surface 84b of the tube 84, a spiral groove 92 is continuously formed without a break from one end 85 of the tube 84 toward the other end (not shown). In this embodiment, the spiral groove 92 is formed at a substantially constant spiral pitch P, for example. A coil-shaped urging member 86 is disposed in the spiral groove 92.

  The spiral groove 92 has a first groove 92a and a second groove 92b. The first groove 92 a is formed in one end portion 85 a (a portion covering the pipe 82) of the outer peripheral surface 84 b of the tube 84. The first groove 92 a is formed in the outer peripheral surface 84 b of the one end portion 85 a of the tube 84 and in a region disposed on the outer peripheral surface 82 b of the pipe 82. One end of the first groove 92a may be formed as an open end or a closed end. One end of the first groove 92a is preferably a closed end that is formed on the other end side of the one end 85 of the tube 84 so that one end of the biasing member 86 does not protrude with respect to the one end 85 of the tube 84. . The second groove 92 b is formed in a portion that is disengaged from the one end portion 85 a of the outer peripheral surface 84 b of the tube 84. The other end of the second groove 92b is preferably formed on one end side with respect to the other end (not shown) of the tube 84. In this embodiment, since the first groove 92a and the second groove 92b are formed as one continuous groove, there is no boundary between the first groove 92a and the second groove 92b.

  The tubes 84 shown in FIGS. 3C and 3D are formed to have substantially the same thickness T. The first groove 92 a and the second groove 92 b are formed at substantially the same depth D with respect to the outer peripheral surface 84 b of the tube 84. The depth D of the first and second grooves 92a and 92b is smaller than the thickness T of the tube 84 and does not penetrate the inner peripheral surface 84a of the tube 84. The groove depth D of the spiral groove 92 is preferably the same as or larger than the outer diameter (diameter thickness) M of the biasing member 86. Here, the urging member 86 is disposed so that the outer peripheral surface thereof is flush with or concave with respect to the outer peripheral surface 84 b of the tube 84. In particular, the urging member 86 is preferably disposed in a concave state on the outer peripheral surface 84 b of the tube 84. Therefore, the biasing member 86 does not protrude with respect to the outer surface of the tube 84. As shown in FIG. 3C, the wall thickness T at the one end portion 85a of the tube 84 can be slightly thinner than T due to elastic deformation in the state of being disposed on the outer peripheral surface 82b of the pipe 82. Similarly, the groove depth D of the first groove 92a at the one end portion 85a of the tube 84 may be slightly smaller than D due to elastic deformation in a state where it is disposed on the outer peripheral surface 82b of the pipe 82.

  As shown in FIGS. 3A and 3B, the biasing member 86 is continuously wound not only at one end portion 85 a of the outer peripheral surface 84 b of the tube 84 but also toward the other end. The winding position of the urging member 86 is the same as or shorter than the range of the spiral groove 92.

  Of the urging member 86, the inner diameter of the portion disposed at the one end portion 85 a of the tube 84 is particularly the same as or smaller than the inner diameter of the tube 84. For this reason, especially the part arrange | positioned in the one end part 85a of the tube 84 among the urging members 86 urges | biases the one end part 85a of the tube 84 with an elastic force with respect to the outer peripheral surface 82b of the other end part 83b of the pipe 82. It is used as a fastening part (fixed part) 86a that is fastened and kept in a fixed state. That is, the fastening portion 86a is disposed in the first groove 92a, and fastens and fixes the one end portion 85a of the tube 84 to the outer peripheral surface 82b of the pipe 82 by an elastic force. A portion of the urging member 86 that is removed from the one end portion 85 a of the tube 84 is used as an adjustment portion 86 b that adjusts the flexibility and elasticity of the tube 84. Further, the portion of the urging member 86 that is removed from the one end portion 85 a of the tube 84, that is, the adjustment portion 86 b is also used to reinforce the tube 84. Of the urging member 86, a portion of the urging member 86 that is removed from the one end portion 85 a, that is, the inner diameter of the adjusting portion 86 b is slightly larger than the inner diameter of the tube 84 and slightly smaller than the diameter of the spiral groove 92. ing. For this reason, the urging member 86 is prevented from dropping off from the tube 84. Further, the adjusting portion 86b prevents buckling such as bending of the tube 84 due to its elasticity.

When the spiral pitch P of the spiral groove 92 is close (small), it is assumed that the thin portion is increased by the spiral groove 92. By taking the spiral pitch P as large as possible, the axial force when pushing the one end portion 85a of the tube 84 into the other end portion 83b of the outer peripheral surface 82b of the pipe 82 is the thick portion (the portion where the spiral groove 92 is not formed). ) For this reason, by taking the spiral pitch P as large as possible, the one end portion 85a of the tube 84 is prevented from buckling when the one end portion 85a of the tube 84 is pushed into the other end portion 83b of the outer peripheral surface 82b of the pipe 82. On the other hand, when the helical pitch P is separated (large), it is assumed that the tube 84 is likely to be bent (buckled). The substantially constant spiral pitch P according to this embodiment is appropriately set so that the generation of both of these is suppressed.
In addition, when the tube 84 is formed of a material in which bending (buckling) of the tube 84 is easily suppressed, one end portion of the tube 84 is pushed when the one end portion 85a of the tube 84 is pushed into the other end portion 83b of the outer peripheral surface 82b of the pipe 82. The spiral pitch P may be any pitch that can suppress the buckling of 85a, and the spiral pitch P may not be substantially constant. That is, the spiral pitch of the one end portion 85a of the tube 84 may be larger or smaller than that of the other portions.

  Next, a process of assembling the pipe 82, the tube 84, and the biasing member 86 according to this embodiment will be described.

First, an example in which the urging member 86 is disposed after the pipe 82 and the tube 84 are connected will be described. The inner diameter of the tube 84 is increased by elastic deformation with an appropriate jig (not shown). The pipe 82 and the tube 84 are arranged on the same central axis C. In this state, the one end portion 85 a of the tube 84 is disposed on the other end portion 83 b of the pipe 82. That is, the pipe 82 is fitted into the tube 84. When the urging member 86 is disposed in the spiral groove 92 formed on the outer peripheral surface 84 b of the tube 84, the urging member 86 is wound along the spiral groove 92. At this time, since the urging member 86 is formed in a coil shape, the urging member 86 is disposed along the spiral groove 92 by elastic deformation of the urging member 86. That is, the urging member 86 fastens the one end portion 85 a of the tube 84 to the pipe 82 by an elastic force. The fastening portion 86a of the biasing member 86 has a biasing force toward the central axis C from the outside of the tube 84 in a state where the one end portion 85a of the tube 84 is disposed at the other end portion 83b of the outer peripheral surface 82b of the pipe 82. Add Here, the fastening portion 86 a of the urging member 86 is formed as a coil that exerts a force that holds the one end portion 85 a of the tube 84 to the outer peripheral surface 82 b of the pipe 82. For this reason, the state which has arrange | positioned the one end part 85a of the tube 84 to the other end part 83b of the outer peripheral surface 82b of the pipe 82 by the fastening part 86a of the urging | biasing member 86 is maintainable.
In the state where the urging member 86 is disposed on the tube 84, the inner diameter of the tube 84 is temporarily increased with a dedicated jig and the pipe 82 is inserted, whereby the tube 82 is inserted into the other end 83b of the pipe 82. One end 85a of 84 can also be fixed.
When the outer periphery of the pipe 82 on which the tube 84 is arranged is bound with a thread (not shown), the diameter of the thread is, for example, about 0.2 mm. Projecting radially outward. On the other hand, when the coiled urging member 86 is disposed in the spiral groove 92, the outer peripheral surface of the fastening portion 86a of the urging member 86 is flush with or on the inner side (center) with respect to the outer peripheral surface 84b of the tube 84. It is arranged in a concave state (position close to the axis C). Therefore, the fastening portion 86 a of the urging member 86 does not protrude radially outward from the outer peripheral surface 84 b of the tube 84 with respect to the central axis C. For this reason, when the tube 84 is fitted to the outside of the pipe 82 and the outside of the tube 84 is fixed by the fastening portion 86a of the urging member 86, the diameter is reduced to at least about twice the diameter of the yarn. Can do.

  The urging member 86 can be disposed on the outer peripheral surface 84 b of the tube 84 simply by sliding along the spiral groove 92 in a spiral manner. For this reason, it can be easily imagined that the assembly is easier than winding the yarn around the outer peripheral surface 84b of the tube 84 and fixing the yarn with an adhesive.

  Moreover, it is assumed that the fixing force which fixes the tube 84 with respect to the pipe 82 by the fastening part 86a arrange | positioned in the 1st groove | channel 92a among the biasing members 86 falls rather than the case where a thread | yarn is used. The However, it is sufficient to fix the one end portion 85 a of the tube 84 to the other end portion 83 b of the pipe 82. Therefore, as shown in FIG. 2, the pipe 82 is fixed to the fourth passage 58, that is, between the other end 83 b of the pipe 82 and the one end 85 a of the tube 84 inside the insertion portion 12 of the endoscope 10. It is enough to maintain a fixed space.

  In this embodiment, the example in which the adjustment portion 86b is formed as the urging member 86 has been described. As long as the pipe 82 and the tube 84 are fastened and fixed by the fastening portion 86a, the second groove 92b and the adjusting portion 86b may be unnecessary.

  Further, the connection between the tube 84 and the base end opening 68b of the channel 68 is not shown. The other end of the tube 84 may be connected to the base end opening 68b using the same pipe 82 described in this embodiment, and the other end of the tube 84 may be appropriately used by using other known structures. May be connected.

In the insertion device 10 according to this embodiment, the tube 84 is disposed at an appropriate position with respect to the outer periphery of the pipe 82, which is arranged as a built-in object inside the insertion portion (tubular body) 12 such as the flexible tube 46 and the bending portion 44. When being fastened and fixed, it is possible to improve assembly while maintaining the fastened state. That is, the insertion device 10 according to this embodiment can improve the assemblability when the tube 84 is disposed at an appropriate position with respect to the outer peripheral surface 82b of the pipe 82, and the outer peripheral surface 82b of the pipe 82. After the tube 84 is disposed, the insertion device 10 capable of maintaining the position of the tube 84 with respect to the outer peripheral surface 82b of the pipe 82 can be provided.
In this embodiment, when the fastening portion 86a of the biasing member 86 is disposed in the first groove 92a, the position of the bottom surface of the first groove 92a is close to the central axis C with respect to the outer peripheral surface of the tube 84. The outer peripheral surface of the fastening portion 86a of the urging member 86 is arranged flush or concave with the first groove 92a with respect to the outer peripheral surface 84b of the tube 84. For this reason, the protrusion to the outer side of the tube 84 can be suppressed in the state which fixed the tube 84 to the appropriate position with respect to the outer periphery of the pipe 82. FIG. For this reason, when fixing the tube 84 to an appropriate position with respect to the outer periphery of the pipe 82, it is possible to prevent the fastening portion 86a from increasing in diameter. The insertion device 10 according to this embodiment can reduce the diameter of the built-in object connected to the pipe 82 and the tube 84 while maintaining the strength and the inner diameter of the pipe 82 and the tube 84.

In this embodiment, the outer peripheral surface of the biasing member 86 faces the outer peripheral surface 84b of the tube 84 in a state where the biasing member 86 is disposed in the spiral groove 92 formed in the outer peripheral surface 84b of the tube 84. It demonstrated as what is arrange | positioned to one or a concave state. The urging member 86 may slightly protrude from the outer peripheral surface 84 b of the tube 84.
Depending on the wire diameter of the fastening portion 86a of the urging member 86 and the protruding amount of the fastening portion 86a with respect to the first groove 92a, the fastening portion 86a is disposed in the first groove 92a even in this case. As compared with the case where the fastening portion 86a is disposed on the outer peripheral surface 84b, the increase in diameter can be suppressed by the depth of the first groove 92a, and the diameter can be reduced. Therefore, even when the biasing member 86 protrudes with respect to the outer peripheral surface 84b of the tube 84, the built-in object to which the pipe 82 and the tube 84 are connected is reduced in diameter while maintaining the strength and inner diameter of the pipe 82 and the tube 84. It is possible to make it.

[First Modification of First Embodiment]
A first modification of the first embodiment will be described with reference to FIGS. 4 (A) and 4 (B).

  Here, the depth D1 of the first groove 92a of the spiral groove 92 is smaller than the depth D2 of the second groove 92b (D1 <D2). For this reason, the thickness T1 at the position where the first groove 92a is formed is larger than the thickness T2 at the position where the second groove 92b is formed. Further, the wire diameter M1 of the fastening portion 86a of the urging member 86 is smaller than the wire diameter M2 of the adjusting portion 86b of the urging member 86 (M1 <M2). The depth D1 of the first groove 92a is preferably equal to or larger than the wire diameter M1 of the fastening portion 86a of the urging member 86 (M1 ≦ D1). Similarly, the depth D2 of the second groove 92b is preferably equal to or larger than the wire diameter M2 of the adjusting portion 86b of the urging member 86 (M2 ≦ D2). The spiral pitch P1 of the first groove 92a is preferably larger than the spiral pitch P2 of the second groove 92b (P1> P2). Here, the helical pitch P <b> 2 of the second groove 92 b is decreased or increased along the central axis C from the distal end side toward the proximal end side. The spiral pitch P2 of the second groove 92b may be constant.

  In this modification, the thickness T1 between the first groove 92a of the outer peripheral surface 84b on the distal end side of the tube 84 and the inner peripheral surface 84a of the tube 84 (the outer peripheral surface 82b of the pipe 82) is the same as the second groove 92b and the tube. It can be made thicker than the wall thickness T2 between the inner peripheral surface 84a of 84. For this reason, in the tube 84, the axial force at the position where the first groove 92a is formed is easily exhibited. Therefore, the tube 84 and the urging member 86 are changed as in the structure according to this modification with respect to the first embodiment, thereby preventing the tube 84 from buckling when the tube 84 is pushed into the pipe 82. be able to.

[Second Modification of First Embodiment]
A second modification of the first embodiment will be described with reference to FIGS. 4 (A) and 4 (C).

  Here, unlike the first modification, the wire diameter of the urging member 86 is the same for the fastening portion 86a and the adjustment portion 86b. And about the strand of the fastening part 86a of the urging | biasing member 86, the cross section is formed in the cross-sectional shape which shaved the inner peripheral side from the circular shape. Further, the height H1 of the wire of the fastening portion 86a (<the outer diameter M of the biasing member 86) is preferably formed to be equal to or less than the depth D1 of the first groove 92a.

  Even if the strands of the urging member 86 are formed in this way, the first groove 92a of the outer peripheral surface 84b on the distal end side of the tube 84 and the inner peripheral surface 84a (the pipe 82 of the pipe 82) are formed as in the first modification. The thickness T1 between the outer peripheral surface 82b) and the outer peripheral surface 82b) can be made thicker than the thickness T2 between the second groove 92b and the inner peripheral surface 84a of the tube 84. For this reason, in the tube 84, the axial force at the position where the first groove 92a is formed is easily exhibited. Therefore, the tube 84 and the urging member 86 are changed as in the structure according to this modification with respect to the first embodiment, thereby preventing the tube 84 from buckling when the tube 84 is pushed into the pipe 82. be able to.

[Second Embodiment]
Next, 2nd Embodiment is described using FIG. 5 (A) and FIG. 5 (B). This embodiment is a modification of the first embodiment including each modification. The same members or members having the same functions as those described in the first embodiment are denoted by the same reference numerals as much as possible. Description is omitted.

  As shown in FIGS. 5A and 5B, in this embodiment, the helical pitch P1 of the first groove 92a is larger than the helical pitch P2 of the second groove 92b. When the coil is used for the biasing member 86, the first groove 92a is preferably formed at least one turn (360 °). That is, the first groove 92a is formed so that the coil can be wound one or more times. In this case, the fastening portion 86a can be wound at least once. The number of turns of the second groove 92b is preferably sufficiently larger than the number of turns of the first groove 92a.

  When the spiral pitch P (see FIG. 3B) of the spiral groove 92 described in the first embodiment is close (small), it is assumed that the thin portion is increased by the spiral groove 92. . As shown in FIG. 5B, the axial force when the one end portion 85a of the tube 84 is pushed into the other end portion 83b of the outer peripheral surface 82b of the pipe 82 by taking the spiral pitch P1 of the first groove 92a as large as possible. , And is received at the thick portion (the portion where the spiral groove 92 is not formed). For this reason, when pushing in the one end part 85a of the tube 84 in the other end part 83b of the outer peripheral surface 82b of the pipe 82, it suppresses that the one end part 85a of the tube 84 buckles.

  The fastening portion 86a of the urging member 86 only needs to be formed so as to maintain the state where the one end portion 85a of the tube 84 is fitted into the other end portion 83b of the outer peripheral surface 82b of the pipe 82. That is, since the entire circumference (360 °) or more of at least one end 85a of the outer peripheral surface 84b of the tube 84 is bound by the coil-shaped fastening portion (first coil) 86a, the outer peripheral surface 82b of the pipe 82 is secured. The fixed state of the one end portion 85a of the tube 84 with respect to the other end portion 83b is maintained.

  Here, the pitch P1 of the first grooves 92a may be the same or different depending on the position. That is, the pitch P1 of the first grooves 92a may not be constant. In any case, when the one end portion 85a of the tube 84 is disposed with respect to the other end portion 83b of the outer peripheral surface 82b of the pipe 82, the pitch P1 of the first groove 92a may be larger than the pitch P2 of the second groove 92b. This can contribute to preventing the tube 84 from buckling.

[Third Embodiment]
Next, a third embodiment will be described with reference to FIG. This embodiment is a modification of the first and second embodiments, and the same members or members having the same functions as those described in the first and second embodiments are given the same reference numerals as much as possible. Detailed description is omitted.

  In this embodiment, the first groove 92a and the second groove 92b of the spiral groove 92 described in the first and second embodiments are formed discontinuously. In other words, in this embodiment, the spiral groove 92 has a first groove 192a and a second groove 192b.

  In this embodiment, the fastening portion 86a and the adjusting portion 86b of the urging member 86 described in the first and second embodiments are formed separately. That is, the urging member 86 includes a first coil 186a as a fastening portion (fixed portion) and a second coil 186b as an adjusting portion.

  Here, one end (tip) 193a of the first groove 192a exists in the region between the one end 183a and the other end 183b of the pipe 82 shown in FIG. The other end (base end) 193b of the first groove 192a may exist in a region between the one end 183a and the other end 183b of the pipe 82 along the central axis C, and the other end 183b of the pipe 82 and the tube It may be present in a region between the other end of the tube 84 (not shown) and in particular in a position close to the one end 85 of the tube 84.

  Similarly, one end (tip) 194a of the second groove 192b may exist in a region between the one end 193a of the first groove 192a and the other end 183b of the pipe 82 along the central axis C. The other end 183b of the tube 84 and the other end (not shown) of the tube 84 may be present at a position close to the one end 85 of the tube 84, in particular.

  If the first coil (fastening portion) 186a and the second coil (adjustment portion) 186b are separate bodies, the first groove 192a and the second groove 192a are the same as the spiral groove 92 described in the first and second embodiments. Of course, the two grooves 192b may be formed continuously. In this case, as described in the second embodiment, it is preferable that the pitch P1 of the first groove 192a and the pitch P2 of the second groove 192b are different. The first coil 186a and the second coil 186b may be the same diameter or different. Further, the first coil 186a and the second coil 186b may be made of different materials.

A modification of the third embodiment will be described with reference to FIG.
The second groove 192b and the discontinuous first groove 192a according to this embodiment may be spiral with respect to the central axis C, but are preferably orthogonal or substantially orthogonal to the central axis C. is there.

  A first groove 192c is formed in one end portion 85a of the outer peripheral surface 84b of the tube 84. Unlike the first groove 192a described above, the first groove 192c is not formed in a spiral shape but is formed in an annular shape or a substantially C shape. That is, the first groove 192 c only needs to be formed around the axis of the tube 84. The axis periphery includes a spiral shape, an annular shape, and a C-shape. Here, as shown in FIG. 7, the first groove 192c is assumed to be annular. The first groove 192c may be one or plural. Here, it is assumed that there are a plurality of first grooves 192c.

  A C-ring (fastening portion) 186c different from the first coil (fastening portion) 186a is disposed in the first groove 192c. The C-ring 186c is an elastically deformable C-shape whose ends are urged in a proximity state. For this reason, the outer peripheral surface 82b of the pipe 82 can be pressed in a state where the C ring 186c is disposed in the first groove 192c.

  Alternatively, the outer peripheral surface 82b of the pipe 82 may be crimped together with the tube 84 in a state where the C ring 186c is disposed in the first groove 192c. That is, the tube 84 may be fixed to the pipe 82 by caulking the C ring 186 c from the outside of the tube 84. In this case, it is assumed that the same fixing force as that in the case of using the yarn is exhibited. The C-ring 186c is not limited to a circular cross section, and may be a rectangular shape or a flat contact surface with a semicircular outer shape. In this case, the ground contact surface between the C ring 186c and the first groove 192c is larger than the circular shape. For this reason, the portion of the C ring 186c that applies a pressing force to the first groove 192c can be increased along the axial direction of the tube 84 to disperse the pressing force applied to the first groove 192c by the C ring 186c. The degree of thinning of the tube 84 can be reduced.

[Fourth Embodiment]
Next, a fourth embodiment will be described with reference to FIG. This embodiment is a modification of the first to third embodiments, and the same members or members having the same functions as those described in the first to third embodiments are given the same reference numerals as much as possible. Detailed description is omitted.

  A flange (protruding portion) 282 that protrudes radially outward with respect to the central axis C is formed at the other end portion 83b of the outer peripheral surface 82b of the pipe 82 according to this embodiment. The flange 282 of the pipe 82 protrudes from the outer peripheral surface 82 b of the pipe 82 at a portion covered with the tube 84. The flange 282 may be formed on the entire circumference or may be formed at appropriate intervals. The protrusion amount of the flange 282 with respect to the one end portion 83a of the outer peripheral surface 82b of the pipe 82 is smaller than the outer diameter (for example, 0.2 mm) of the yarn.

  Once the one end portion 85a of the tube 84 is fixed to the other end portion 83b in which the flange 282 of the outer peripheral surface 82b of the pipe 82 is formed by the flange 282, the pipe 84 is elastically deformed by the elastic deformation of the one end portion 85a of the tube 84. It can be easily imagined that the fixed state of the one end portion 85a of the tube 84 is difficult to be released with respect to the other end portion 83b of the outer peripheral surface 82b of 82. That is, the pipe 82 according to this embodiment is maintained in a fixed state rather than the fixed state of the one end portion 85a of the tube 84 with respect to the other end portion 83b of the outer peripheral surface 82b of the pipe 82 described in the first to third embodiments. easy.

The pitch P1 of the first grooves 92a is larger than the pitch P2 of the second grooves 92b. When the coil (first coil) is used, the first groove (fixed portion) 92a is preferably formed at least 360 ° or more. That is, a flange 282 is provided on the pipe 82, and at least one turn of the first coil 186a serving as a fixed portion is disposed on the side closer to the one end 183a of the pipe 82 than the flange 282. As described in the first embodiment, when the one end portion 85a of the tube 84 is disposed on the other end portion 83b of the outer peripheral surface 82b of the pipe 82, the tube 84 can be prevented from buckling.
The protruding amount of the flange 282 with respect to the outer peripheral surface 82b of the pipe 82 is smaller than the thickness of the thread. For this reason, the diameter of the connection structure between the pipe 82 and the tube 84 can be reduced.

  In addition, when using C ring 186c demonstrated in 3rd Embodiment and a caulking member, if the tube 84 is pressed with respect to the pipe 82 in the range of 180 degrees or more, it is not necessarily required to the range of 360 degrees. .

[Modification of Fourth Embodiment]
As shown in FIG. 9, the first coil (fastening portion) 186a and the second coil (adjustment portion) 186b may be formed separately as described in the third embodiment. is there. In this case, the first groove 192a and the second groove 192b may be formed discontinuously or may be formed continuously.

  Although several embodiments have been specifically described so far with reference to the drawings, the present invention is not limited to the above-described embodiments, and all the embodiments performed without departing from the scope of the present invention. including.

  DESCRIPTION OF SYMBOLS 10 ... Insertion device (endoscope), 68 ... Channel, 82 ... Pipe, 82a ... Inner peripheral surface, 82b ... Outer peripheral surface, 83a ... One end part, 83b ... Other end part, 84 ... Channel tube, 84a ... Inner peripheral surface , 84b ... outer peripheral surface, 85a ... one end, 85 ... one end, 86 ... biasing member, 86a ... fastening portion, 86b ... adjusting portion, 92 ... spiral groove, 92a ... first groove, 92b ... second groove, C ... central axis, P1 ... spiral pitch, P2 ... spiral pitch.

Claims (14)

An insertion part to be inserted toward the object;
A cylindrical member disposed in the insertion portion;
A flexible tube covering the outer periphery of the end of the cylindrical member in the insertion portion;
Of the tube, a groove formed around an axis on an outer periphery of a portion covering the cylindrical member,
An insertion device comprising: a fastening portion that is disposed in the groove and fastens the tube to the cylindrical member by an elastic force.   The insertion device according to claim 1, wherein the fastening portion is a first coil formed in a spiral shape.   The insertion device according to claim 2, wherein the groove is formed in a spiral shape.   The insertion device according to claim 2, wherein the groove is formed so that the first coil can be wound one or more times. Another groove formed in a region different from the portion covering the outer periphery of the end of the tubular member on the outer peripheral surface of the tube;
An adjusting portion that is disposed in the other groove and adjusts flexibility and elasticity of the tube;
The insertion device according to claim 1, comprising:   The insertion device according to claim 5, wherein the groove and the other groove are formed continuously.   The insertion device according to claim 5, wherein a depth of the groove is smaller than a depth of the other groove. The other groove is formed in a spiral shape,
The said adjustment part is a 2nd coil formed in the spiral shape which prevents the buckling of the area | region different from the part which covers the outer periphery of the said edge part of the said cylindrical member among the said tubes. Insertion device. The fastening portion is a first coil formed in a spiral shape,
The insertion device according to claim 8, wherein a helical pitch of the first coil arranged in the groove is larger than a helical pitch of the second coil arranged in the other groove. The fastening portion is a first coil formed in a spiral shape,
The insertion device according to claim 8, wherein the first coil and the second coil are formed continuously. The fastening portion is a first coil formed in a spiral shape,
The insertion device according to claim 8, wherein a thickness of the first coil arranged in the groove is smaller than a thickness of the second coil arranged in the other groove.   The insertion device according to claim 1, wherein the cylindrical member has a protruding portion protruding from an outer peripheral surface of the cylindrical member at a portion covered with the tube. The groove is formed in a C shape or an annular shape,
The fastening portion is formed in an elastically deformable C-shape in which the end portions are urged in proximity to each other, and can press the outer peripheral surface of the cylindrical member in a state of being disposed in the groove. The insertion device according to claim 1.   The insertion device according to claim 1, wherein the groove is disposed such that an outer peripheral surface of the fastening portion disposed in the groove is flush or concave with respect to an outer peripheral surface of the tube.