JP4608518B2 - Tubular member and endoscope treatment tool - Google Patents

Description

  The present invention relates to a tubular member used together with an endoscope in endoscopic surgery, and an endoscope treatment tool having the tubular member.

  In a surgical operation using an endoscope, a treatment tool for an endoscope having a treatment portion such as forceps at the distal end portion of a sheath is used. A connecting member that connects the treatment portion of the endoscope treatment tool and the distal end portion of the sheath is disclosed in, for example, Patent Document 1 below.

Also, depending on the type of surgery, different types of sheaths may be connected for the purpose of changing the hardness of the sheath on the way. An endoscope treatment instrument in which different types of sheaths are connected is disclosed in, for example, Patent Document 2 below.
JP 2002-52029 A Japanese Utility Model Publication No. 5-15914

  By the way, in the conventional endoscope treatment tool as described above, two flexible sheaths are connected via a tubular member made of a hard material. When such an endoscopic treatment tool is inserted into an endoscope channel and used, a flexible sheath is curved, but a tubular member made of a hard material is not curved. For this reason, an axial force to be pulled out acts between the tubular member and the sheath, and bending occurs. That is, in the sheath, stress due to pulling is generated and stress due to bending is generated. When such stress acts on the sheath, the sheath may be bent or broken.

  The present invention has been made in view of the above circumstances, and prevents the sheath from bending or breaking when the endoscope treatment tool is inserted into an endoscope channel and used. It is an object of the present invention to provide a tubular member and an endoscopic treatment tool that can be used.

A first aspect of the tubular member of the present invention is a substantially tubular tubular member connected to an end portion of a sheath, and is provided at the end portion of at least one of the main body portion and the main body portion. A sheath receiving portion fitted to the inner peripheral side or the outer peripheral side of the end portion of the first end portion, and a sheath connecting portion provided between the main body portion and the sheath receiving portion to which the end portion of the sheath is fixed. The outer diameter or inner diameter of the sheath receiving portion is distributed between the sheath fitted to the sheath receiving portion and stress generated due to bending of the sheath in the axial direction of the sheath receiving portion. It is set to a size that allows a gap to be formed .

  In the first aspect of the tubular member of the present invention, the sheath connection portion may be formed with a step portion with which an end portion of the sheath fitted to the sheath receiving portion abuts.

  1st aspect of the tubular member of this invention WHEREIN: The said sheath connection part may be formed with a metal, and the said sheath formed with the metal may be fixable by heat processing.

A second aspect of the tubular member of the present invention is a substantially tubular tubular member connected to an end portion of a sheath made of metal in a coil shape, and includes a main body portion and at least one of the main body portions. Provided between the sheath receiving portion provided at the end portion and fitted to the inner peripheral side or outer peripheral side of the end portion of the sheath, and between the main body portion and the sheath receiving portion, and fitted into the sheath receiving portion with an end portion of the sheath that is has a stepped portion in contact is formed, is formed of a metal, have a sheath connecting portion is fixable by heat treatment the ends of the sheath, the sheath receiving portion The outer diameter or the inner diameter is formed with a gap for dispersing stress generated due to bending of the sheath in the axial direction of the sheath receiving portion between the sheath fitted to the sheath receiving portion. It is set to a size.

A first aspect of an endoscope treatment tool of the present invention is for an endoscope having a flexible sheath inserted into a channel of an endoscope, a substantially tubular tubular member, and a treatment portion. In the treatment instrument, the tubular member includes a main body portion, a sheath receiving portion provided at a proximal end portion of the main body portion, and fitted to an inner peripheral side or an outer peripheral side of a distal end portion of the sheath, and the main body And a sheath connecting portion to which the distal end portion of the sheath is fixed, and an outer diameter or an inner diameter of the sheath receiving portion is fitted to the sheath receiving portion. A gap is formed between the sheath and the sheath so as to disperse stress generated due to bending of the sheath in the axial direction of the sheath receiving portion. It connects with the front-end | tip part of the main-body part of a tubular member.

  In the first aspect of the endoscope treatment tool of the present invention, the sheath and the tubular member are formed of metal, and the distal end portion of the sheath and the sheath connection portion of the tubular member are fixed by heat treatment. It may be.

A second aspect of the endoscope treatment tool according to the present invention is an endoscope treatment tool having a plurality of flexible sheaths inserted into the endoscope channel and a substantially tubular tubular member. The tubular member is provided at a body part interposed between two end portions of the two adjacent sheaths, and at both ends of the body part, and is provided on an inner peripheral side or an outer peripheral side of the end part of the sheath. and fitted sheath receiving portion, provided between the body portion and the sheath receiving portion, have a sheath connecting portion distal end portion of the sheath is fixed, the outer diameter or the inner diameter of the sheath receiving portion Is sized so that a gap is formed between the sheath and the sheath that is fitted to the sheath receiving portion, in order to disperse stress generated due to bending of the sheath in the axial direction of the sheath receiving portion. Is set .

  In the second aspect of the endoscope treatment tool of the present invention, the sheath and the tubular member are made of metal, and the end of the sheath and the sheath connecting portion of the tubular member are fixed by heat treatment. It may be.

  As described above, according to the present invention, it is possible to prevent the sheath from bending or breaking when the endoscope treatment tool is inserted into a channel of the endoscope.

  FIG. 1 shows a first embodiment of an endoscope treatment tool according to the present invention. As shown in FIG. 1, an endoscope treatment tool 1 includes an operation unit 2 operated by an operator, a first sheath 3 extending from the operation unit 2, and a second sheath extending from a distal end portion 3 a of the first sheath 3. 4, a treatment portion 5 provided at the distal end portion 4 a of the second sheath 4, and a tubular member 6 that connects the first sheath 3 and the second sheath 4.

  The first sheath 3 and the second sheath 4 are both substantially tubular with an outer diameter of about 2 mm to 4 mm and an inner diameter of about 0.5 mm to 3 mm, and are formed in a coil shape with metal. For this reason, the first sheath 3 and the second sheath 4 have flexibility. The first sheath 3 is a flat coil sheath in which a plate-shaped wire is wound in a coil shape, and the second sheath 4 is a round coil sheath in which a wire having a round cross section is wound in a coil shape. Since both are different in the shape and thickness of the wire, the hardness against bending is relatively different, and the second sheath 4 can be bent more easily than the first sheath 3.

  The treatment portion 5 is formed with a collar portion 5a at both ends, a clip body 5c formed with a ring 5b at the base end portion thereof, a substantially tubular cover 5d, and a cover 5d, and inserted into the ring 5b of the clip body 5c. It is a clip which has the operation wire 5e connected to. The diameter of the ring 5b is set larger than the inner diameter of the cover 5d. The cover 5d can be inserted and attached to the second sheath 4 at the base end. Further, the operation wire 5 e is inserted into the first sheath 3 and the second sheath 4, respectively, and is connected to the operation unit 2 provided at the proximal end portion 3 b of the first sheath 3.

  As shown in FIG. 1, the operation unit 2 includes a grip portion 2a and a slider 2b that can move in the axial direction on the grip portion 2a. An operation wire 5e is connected to the slider 2b. Therefore, by pulling the slider 2b toward the proximal end on the grip portion 2a, the ring 5b of the treatment portion 5 is inserted into the cover 5d, and the diameter thereof is reduced according to the inner diameter of the cover 5d. As a result, the flanges 5a at both ends of the clip body 5c are closed, and a predetermined portion can be held.

  As shown in FIG. 2, the tubular member 6 is a substantially tubular member, and is formed of metal. The tubular member 6 is disposed coaxially between the first sheath 3 and the second sheath 4, and is provided with a main body portion 7, a first sheath receiving portion 8 provided at a base end portion of the main body portion 7, and It has a first sheath connection part 10, a second sheath receiving part 9 and a second sheath connection part 11 provided at the tip of the main body part 7.

  The first sheath receiving portion 8 is fitted to the inner peripheral side of the first sheath 3, and the first sheath connecting portion 10 is provided between the main body portion 7 and the first sheath receiving portion 8. The second sheath receiving portion 9 is fitted to the inner peripheral side of the second sheath 4, and the second sheath connecting portion 11 is provided between the main body portion 7 and the second sheath receiving portion 9. The outer diameter of the first sheath receiving portion 8 is set to a diameter that is substantially equal to the inner diameter of the first sheath 3 and can be easily attached and detached in the axial direction. Similarly, the outer diameter of the second sheath receiving portion 9 is set to a diameter that is substantially equal to the inner diameter of the second sheath 4 and that can be easily attached and detached in the axial direction.

  The first sheath connection portion 10 is formed with a step portion 10a with which the distal end portion 3a of the first sheath 3 fitted to the first sheath receiving portion 8 abuts. Similarly, the second sheath connecting portion 11 is also formed with a step portion 11a with which the proximal end portion 4b of the second sheath 4 abuts. And the 1st sheath 3 and the tubular member 6 which were mutually formed with the metal are the 1st sheath connection part 10, and the welding part 12 by which all the circumferences were welded by laser welding as a heat treatment is formed and fixed. . Similarly, the second sheath 4 and the tubular member 6 are fixed at the second sheath connecting portion 11 by forming a welded portion 13 that is welded all around by laser welding. In addition, the length of the axial direction fitted to the 1st sheath 3 by the 1st sheath receiving part 8 and the 1st sheath connection part 10 is about 1 mm-5 mm. In addition, the axial length of the second sheath receiving portion 9 and the second sheath connecting portion 11 fitted to the second sheath 4 is about 1 mm to 5 mm.

Next, the operation of this embodiment will be described.
As shown in FIG. 2, the first sheath 3 is fixed at the distal end portion 3 a so as not to be pulled out in the axial direction by the welded portion 12 in the first sheath connecting portion 10 of the tubular member 6. Further, the first sheath 3 is supported in the radial direction so as to resist bending by the first sheath receiving portion 8 of the tubular member 6 on the proximal end side with respect to the welded portion 12. Similarly, the second sheath 4 is fixed at the base end portion 4 b so as not to be pulled out in the axial direction by the welded portion 13 in the second sheath connecting portion 11 of the tubular member 6. Further, the second sheath 4 is supported in the radial direction so as to resist bending by the second sheath receiving portion 9 of the tubular member 6 on the distal end side relative to the welding portion 13.

  In the endoscope treatment tool 1, the first sheath 3, the tubular member 6, the second sheath 4, and the treatment portion 5 integrated as described above are inserted into a channel of an endoscope, for example. At this time, the flexible first sheath 3 and second sheath 4 are curved and the tubular member 6 is not curved as the endoscope is curved. For this reason, an axial force to be pulled out and bending act between the tubular member 6 and the first sheath 3 and between the tubular member 6 and the second sheath 4. That is, in each of the first sheath 3 and the second sheath 4, stress due to drawing occurs and stress due to bending occurs.

  As shown in FIG. 3, for example, the second sheath 4 is supported in the radial direction by the second sheath receiving portion 9, and therefore stress caused by bending is applied to the distal end portion of the second sheath receiving portion 9 of the tubular member 6. Occurs at position 4c corresponding to 9a. On the other hand, the stress resulting from drawing is generated in the welded portion 13 of the base end portion 4b to which the second sheath 4 is fixed. At this time, since the second sheath 4 has a degree of freedom without being restricted in the axial direction in the second sheath receiving portion 9, a gap is generated between the wire members forming the coil according to the acting stress, and the second sheath 4 As the second sheath 4 expands on the receiving portion 9, the stress caused by bending is dispersed and relaxed.

  This also applies to the first sheath 3, and as shown in FIG. 2, the stress caused by bending is generated at a position 3 c corresponding to the base end portion 8 a of the first sheath receiving portion 8, and is caused by pulling. The stress to be generated is generated in the welded portion 12. Further, the stress caused by bending is dispersed and relaxed in the first sheath receiving portion 8.

  In this way, the position where the stress due to bending occurs and the position where the stress due to pulling out can be shifted and dispersed, so the first end corresponding to the base end portion 8a of the first sheath receiving portion 8 can be dispersed. Bending deformation and breakage at the position 3c of the one sheath 3 can be prevented. Similarly, bending deformation and breakage at the position 4c of the second sheath 4 corresponding to the distal end portion 9a of the second sheath receiving portion 9 can be prevented.

  In the present embodiment, both the first sheath 3 and the first sheath connection portion 10 and the second sheath 4 and the second sheath connection portion 11 are fixed by laser welding. With the fixing method, high strength and high workability can be obtained. On the other hand, since laser welding is a fixing method by heat treatment, there is a disadvantage that the material is denatured by heating and becomes brittle in the welded portions 12 and 13 and the vicinity thereof. However, since the stress caused by bending does not act on the welded portions 12 and 13 and the vicinity thereof, the advantages of laser welding can be maximized.

  Further, a step portion 10 a is formed in the first sheath connection portion 10, and a step portion 11 a is formed in the second sheath connection portion 11. For this reason, the 1st sheath 3 can be reliably fitted to the 1st sheath receiving part 8 by making the front-end | tip part 3a of the 1st sheath 3 contact | abut to the step part 10a. Further, the second sheath 4 can be reliably fitted to the second sheath receiving portion 9 by bringing the base end portion 4 b of the second sheath 4 into contact with the stepped portion 11 a. Furthermore, the connection area of the welded portion 12 can be increased by increasing the contact area between the first sheath 3 and the first sheath connecting portion 10 by the stepped portion 10a. Moreover, the area where the second sheath 4 and the second sheath connecting portion 11 are in contact with each other can be increased by the stepped portion 11a, and the connection strength of the welded portion 13 can be increased.

As described above, the tubular member 6 can securely connect the two sheaths without fear of bending deformation or breaking, thereby extending the length of the insertion portion of the endoscope treatment instrument, Depending on the equation, it is possible to change the hardness and material of the sheath. Moreover, even if it is a case where the coil sheath is a multi-coil and the number of each wire is different by connection of coil sheaths like this embodiment, it is possible to connect easily.
In this embodiment, two types of sheaths are connected by the tubular member 6, but the present invention is not limited to this. Three or more types of sheaths may be connected by a plurality of tubular members.

  4 and 5 show a first modification of this embodiment. As shown in FIG. 4, in the tubular member 20 of this modified example, the outer diameter of the first sheath receiving portion 21 is set such that a gap 23 is formed between the first sheath 3 and the first sheath 3. Similarly, the outer diameter of the second sheath receiving portion 22 is set to a size that allows a gap 24 to be formed between the second sheath 4 and the second sheath 4. More specifically, the gaps 23 and 24 are set to be within 0.2 mm.

  As shown in FIG. 5, in the tubular member 20 of this modification, for example, when the second sheath 4 is curved, the gap 24 is deformed so as to be gradually narrowed. For this reason, the stress generated due to bending at the position 4 c of the second sheath 4 can be dispersed in the axial direction of the second sheath receiving portion 22. As shown in FIG. 4, the same applies to the first sheath 3, and the stress generated due to bending at the position 3 c can be dispersed in the axial direction of the first sheath receiving portion 21. For this reason, the reliability with respect to bending deformation and breakage at the position 3c of the first sheath 3 and the position 4c of the second sheath 4 can be further improved.

FIG. 6 shows a second embodiment of the endoscope treatment tool according to the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.
As shown in FIG. 6, the endoscope treatment tool 30 of this embodiment includes a sheath 31 that is an insertion portion extending from the operation portion 2, a treatment portion 32 provided at a distal end portion 31 a of the sheath 31, and a sheath 31. A tubular member 33 that connects the treatment portion 32 is provided. The sheath 31 is formed of a metal in a coil shape and has flexibility.

  As shown in FIG. 7, the treatment portion 32 is openable and closable around a shaft 32a, and is connected to a pair of cups 32c formed with tooth portions 32b, a cover 32d that rotatably supports the shaft 32a, and the cups 32c. A biopsy forceps having an operation wire 32e that opens and closes the cup 32c by moving back and forth in the axial direction. As shown in FIG. 6, the operation wire 32 e is inserted through the inside of the sheath 31 and is connected to the slider 2 b of the operation unit 2 provided at the proximal end portion 31 b of the sheath 31. That is, by moving the slider 2b forward and backward on the grip portion 2a of the operation portion 2, the operation wire 32e can be advanced and retracted to open and close the pair of cups 32c.

  As shown in FIG. 7, the tubular member 33 is a substantially tubular member, and is formed of metal. The tubular member 33 is disposed coaxially with the distal end portion 31 a of the sheath 31, and is provided at the base end portion of the main body portion 34 and the main body portion 34 interposed between the sheath 31 and the treatment portion 32. It has a sheath receiving portion 35 fitted on the inner peripheral side, and a sheath connecting portion 36 provided between the main body portion 34 and the sheath receiving portion 35. The outer diameter of the sheath receiving portion 35 is set to a diameter that is substantially equal to the inner diameter of the sheath 31 and can be easily attached and detached in the axial direction.

  Further, the sheath connecting portion 36 is formed with a step portion 36a with which the distal end portion 31a of the sheath 31 fitted to the sheath receiving portion 35 abuts. And in the sheath connection part 36, the sheath connection part 36 and the sheath 31 which were mutually formed with the metal are formed with a welded part 37 welded by laser welding as a heat treatment, and are fixed.

  A through hole 34 a that penetrates in the radial direction from the side surface is formed at the tip of the main body 34. The cover 32d of the treatment portion 32 has a through hole 32f that is inserted into the distal end portion of the tubular member 33 and that corresponds to the through hole 34a of the main body portion 34. A pin 38 is inserted into the through hole 34 a of the main body 34 and the through hole 32 f of the treatment portion 32, whereby the treatment portion 32 is fixed to the tubular member 33.

Next, the operation of this embodiment will be described.
As shown in FIG. 7, the sheath 31 is fixed so as not to be pulled out in the axial direction by the welded portion 37 in the sheath connecting portion 36. Furthermore, it is supported in the radial direction so as to resist bending by the sheath receiving portion 35 of the tubular member 33 on the proximal end side with respect to the welded portion 37.

  When the sheath 31 is curved, an axial force to be pulled out and bending act between the tubular member 33 and the sheath 31 as in the first embodiment. For this reason, in the sheath 31, a stress caused by pulling and a stress caused by bending are generated. Since the sheath 31 is supported in the radial direction by the sheath receiving portion 35, the stress caused by bending is generated at a position 31 c corresponding to the proximal end portion 35 a of the sheath receiving portion 35 of the tubular member 33. On the other hand, the stress resulting from the drawing is generated in the welded portion 37 of the distal end portion 31a to which the sheath 31 is fixed. At this time, the sheath 31 has a degree of freedom without being restricted in the axial direction at the sheath receiving portion 35. For this reason, the sheath 31 is stretched in accordance with the acting stress in the range supported by the sheath receiving portion 35, whereby the stress caused by bending is dispersed and relaxed.

  In this way, the position where the stress due to bending is generated and the position where the stress due to pulling out can be shifted and dispersed, so the sheath 31 corresponding to the proximal end portion 35a of the sheath receiving portion 35 can be dispersed. Bending deformation and breakage at the position 31c can be prevented. In addition, since the stress caused by bending does not act on the welded portion 37 and the vicinity thereof, the characteristics of high strength and high workability, which are advantages of laser welding, can be utilized to the maximum. In addition, since the stepped portion 36 a is formed in the sheath connecting portion 36, the sheath 31 can be brought into contact with the stepped portion 36 a and reliably fitted to the sheath receiving portion 35. Further, the contact area between the sheath 31 and the sheath connecting portion 36 can be increased to increase the connection strength of the welded portion 37.

  As described above, the tubular member 33 enables the sheath 31 and the treatment portion 32 to be reliably connected without fear of bending deformation or breaking. In addition, although the biopsy forceps was mentioned as an example as a treatment tool, it is not restricted to this. In addition to the biopsy forceps, it is possible to use forceps such as grasping forceps and scissors forceps. Besides the forceps, various treatment parts such as a high-frequency snare or a clip are securely connected by the tubular member 33. be able to.

  FIG. 8 shows a first modification of this embodiment. As shown in FIG. 8, this modification shows a case where the inner diameter of the sheath 39 is smaller than the outer diameter of the sheath receiving portion 35 of the tubular member 33. The sheath 39 is processed so that the inner peripheral surface 39b is ground at the distal end portion 39a so that the sheath 39 can be fitted into the diameter. In this manner, the distal end portion 39a of the sheath 39 may be processed so that the tubular member and the sheath can be fitted.

  FIG. 9 shows a second modification of this embodiment. As shown in FIG. 9, in this modification, a step portion is not formed in the sheath connection portion 41 of the tubular member 40. Even in such a tubular member 40, the same effect can be obtained by forming and fixing the welded portion 42 by laser welding in the sheath connecting portion 41.

  FIG. 10 shows a third modification of this embodiment. As shown in FIG. 10, in this modification, the inner diameter of the sheath receiving portion 46 of the tubular member 45 is set to a size that is substantially equal to the outer diameter of the sheath 31 and can be easily attached and detached in the axial direction. Further, a stepped portion 47a of the sheath connecting portion 47 is formed on the inner peripheral side. For this reason, the sheath receiving part 46 is fitted to the outer peripheral side of the sheath 31, and the distal end part 31a of the sheath 31 is in contact with the stepped part 47a. Further, in the sheath connection portion 47, the distal end portion 31 a of the sheath 31 is discontinuously welded at a plurality of locations in the circumferential direction by laser welding from the outer peripheral side of the sheath connection portion 47 to form a weld portion 48. .

  Thus, even if the sheath receiving portion 46 of the tubular member 45 is fitted to the outer peripheral side of the sheath 31, the same effect can be obtained. In this case, the welded portion 48 between the sheath 31 and the sheath connecting portion 47 of the tubular member 45 is on the inner peripheral side of the sheath connecting portion 47, but since it is laser welding, welding from the outer peripheral side is possible. Further, as in this modification, the welded portion 48 may be welded discontinuously in the circumferential direction instead of the entire circumference welding as long as the strength in the axial direction can be ensured.

  FIG. 11 shows a fourth modification of this embodiment. As shown in FIG. 11, in this modification, the sheath 50 and the tubular member 51 are made of resin. And the front-end | tip part 50a of the sheath 50 and the sheath connection part 52 of the tubular member 51 are welded by ultrasonic welding, and the welding part 53 is formed and fixed. As described above, when the sheath 50 is made of resin, the tubular member 51 is also made of resin and fixed by welding, whereby the sheath 50 and the tubular member 51 can be fixed. Further, when the sheath 50 is bent, the position in the axial direction between the position 50b where the stress caused by bending is generated and the welded portion 53 can be shifted, and a similar effect can be obtained.

  Furthermore, in FIG. 12, the 5th modification in this embodiment is shown. As shown in FIG. 12, in this modification, a ring 54 made of metal is fitted on the outer peripheral side of the distal end portion 50a of the sheath 50 fitted on the outer peripheral side in the sheath connecting portion 52 of the tubular member 51. I am letting. Then, after inserting a true rod (not shown) into the sheath 50, the ring 54 is pressed from the outer peripheral side toward the center of the sheath 50 to be plastically deformed, so that the distal end portion 50a of the sheath 50 is crimped to the sheath connecting portion 52. And fixed. In such a fixing method, the same effect can be obtained.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to said embodiment. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. The present invention is not limited by the above description, and is limited only by the matters described in the claims.
For example, in each embodiment, although the connection method of the front-end | tip part of a sheath and the sheath connection part of a tubular member was demonstrated, it is not restricted to these connection methods. Any method can be used as long as the sheath and the tubular member can be fixed while securing a predetermined strength within a limited range of the sheath connecting portion.

The present invention relates to an endoscope treatment instrument having a flexible sheath inserted into a channel of an endoscope, a substantially tubular tubular member, and a treatment portion. The tubular member includes a main body portion, a sheath receiving portion provided at a proximal end portion of the main body portion, and fitted to an inner peripheral side or an outer peripheral side of a distal end portion of the sheath, and the main body portion and the sheath receiving portion. And a sheath connection portion to which the distal end portion of the sheath is fixed. The treatment portion is connected to a distal end portion of the main body portion of the tubular member.
ADVANTAGE OF THE INVENTION According to this invention, when inserting and using the treatment tool for endoscopes in the channel of an endoscope, it can prevent that a sheath carries out bending deformation or fracture | rupture.

It is a figure which shows the structure of 1st Embodiment of the treatment tool for endoscopes which concerns on this invention. In the 1st Embodiment of this invention, it is the side view which fractured | ruptured a part which shows the structure of a tubular member, and the state of the connection of adjacent sheaths. In the 1st Embodiment of this invention, it is sectional drawing which shows the state of the connection of a sheath and a tubular member when a sheath curves. It is the side view which fractured | ruptured a part which shows the 1st modification of the connection method of the tubular member and sheath in the 1st Embodiment of this invention. In the 1st Embodiment of this invention, it is sectional drawing which shows the state of the connection of a sheath and a tubular member when a sheath curves. It is a figure which shows the structure of 2nd Embodiment of the treatment tool for endoscopes which concerns on this invention. In the 2nd Embodiment of this invention, it is the side view which fractured | ruptured a part which shows the state of the connection of a structure of a tubular member, and a treatment part and a sheath. It is the side view which fractured | ruptured a part which shows the 1st modification of the connection method of the tubular member and sheath in the 2nd Embodiment of this invention. It is the side view which fractured | ruptured a part which shows the 2nd modification of the connection method of the tubular member and sheath in the 2nd Embodiment of this invention. It is the side view which fractured | ruptured a part which shows the 3rd modification of the connection method of the tubular member and sheath in the 2nd Embodiment of this invention. It is the side view which fractured | ruptured a part which shows the 4th modification of the connection method of the tubular member and sheath in the 2nd Embodiment of this invention. It is the side view which fractured | ruptured a part which shows the 5th modification of the connection method of the tubular member and sheath in the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Endoscopic treatment tool, 3 ... 1st sheath, 4 ... 2nd sheath, 6 ... Tubular member, 7 ... Main-body part, 8 ... 1st sheath receiving part, 9 ... 2nd sheath receiving part, 10 ... 1st 1 sheath connection part, 10a ... step part, 11 ... second sheath connection part, 11a ... step part, 12 ... welding part, 13 ... welding part

Claims (8)

A generally tubular member connected to the end of the sheath,
The main body,
A sheath receiving portion that is provided at at least one end of the main body and is fitted to the inner peripheral side or the outer peripheral side of the end of the sheath;
Provided between the body portion and the sheath receiving portion, it has a sheath connecting portion which the end of the sheath is fixed,
The outer diameter or inner diameter of the sheath receiving portion is for dispersing stress generated due to bending of the sheath in the axial direction of the sheath receiving portion between the sheath receiving portion and the sheath fitted to the sheath receiving portion. The tubular member set to the magnitude | size in which the clearance gap is formed . The tubular member according to claim 1,
The sheath connecting portion is formed with a step portion with which the end portion of the sheath fitted to the sheath receiving portion abuts. The tubular member according to claim 1,
The sheath connecting portion is made of metal, and the sheath made of metal can be fixed by heat treatment. A substantially tubular tubular member connected to the end of a sheath formed of metal in a coil shape,
The main body,
A sheath receiving portion provided at at least one end of the main body and fitted to the inner peripheral side or outer peripheral side of the end of the sheath;
A step portion provided between the main body portion and the sheath receiving portion and in contact with an end portion of the sheath fitted to the sheath receiving portion is formed, and is formed of a metal, and the end of the sheath part possess a sheath connecting portion is fixable by heat treatment,
The outer diameter or inner diameter of the sheath receiving portion is for dispersing stress generated due to bending of the sheath in the axial direction of the sheath receiving portion between the sheath receiving portion and the sheath fitted to the sheath receiving portion. The tubular member set to the magnitude | size in which the clearance gap is formed . An endoscope treatment instrument having a flexible sheath inserted into a channel of an endoscope, a substantially tubular member, and a treatment portion,
The tubular member includes a main body portion, a sheath receiving portion provided at a proximal end portion of the main body portion, and fitted to an inner peripheral side or an outer peripheral side of a distal end portion of the sheath, and the main body portion and the sheath receiving portion. A sheath connecting portion to which the distal end portion of the sheath is fixed,
The outer diameter or inner diameter of the sheath receiving portion is for dispersing stress generated due to bending of the sheath in the axial direction of the sheath receiving portion between the sheath receiving portion and the sheath fitted to the sheath receiving portion. Is set to a size that creates a gap between
The treatment portion is an endoscope treatment tool connected to a distal end portion of a main body portion of the tubular member. The endoscope treatment tool according to claim 5 ,
The sheath and the tubular member are made of metal, and the distal end portion of the sheath and the sheath connecting portion of the tubular member are fixed by heat treatment. An endoscopic treatment instrument having a plurality of flexible sheaths inserted into channels of an endoscope and a substantially tubular tubular member,
The tubular member is provided at both end portions of the main body portion interposed between the end portions of the two adjacent sheaths, and fitted to the inner peripheral side or the outer peripheral side of the end portion of the sheath. a sheath receiving portion, provided between the body portion and the sheath receiving portion, have a sheath connecting portion distal end portion of the sheath is fixed, the outer diameter or the inner diameter of the sheath receiving portion, said sheath A gap is formed between the sheath to be fitted to the receiving portion so as to form a gap for dispersing stress generated due to bending of the sheath in the axial direction of the sheath receiving portion. Endoscopic treatment tool. The endoscope treatment tool according to claim 7 ,
The sheath and the tubular member are made of metal, and the end portion of the sheath and the sheath connecting portion of the tubular member are fixed by heat treatment.

Images