Retainer device with tubular retainer

Abstract

To provide a retainer device with a tubular retainer in which a contrast member is hardly brought into contact with an inner surface of the sheath.SOLUTION: A retainer device with a tubular retainer includes: a tubular retainer which is retained in a biological lumen and which can expand and shrink in a radial direction; and a longitudinal retainer device which detachably and attachably holds the tubular retainer and introduces the tubular retainer into the biological lumen. The retainer device includes a sheath 3 which can store the tubular retainer; and a longitudinal shaft member 4 provided inside the sheath 3 and configured to advance and retract along an axial direction. The tubular retainer includes: an annular Skelton part 17 that locks wire members 16 that is folded in the axial direction and formed by braiding the wire member in a lattice manner; and a contrasting member 18 attached to the wire member. The annular skeleton part 17 is folded such that a gap net the lattice shrinks, and at least one of the locked wire members 16 is stored in the sheath 3 in a state of being inclined with respect to a radial direction.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an indwelling device with a tubular indwelling device. [Background technology]

[0002] Conventionally, there have been known tubular retention devices that are retained at diseased sites, such as narrowed or obstructed sites, in digestive tracts, such as the esophagus, stomach, small intestine, large intestine, and bile duct, or blood vessels (hereinafter referred to as "biological lumens"), and that expand the diameter of the diseased site to maintain the patency of the biological lumen (e.g., Patent Document 1, etc.).

[0003] This type of tubular indwelling device is delivered to the target placement site in a radially contracted state using, for example, an indwelling device (catheter). At the target placement site, the tubular indwelling device is released from the sheath of the indwelling device into the body lumen, where it radially expands and is placed at the target placement site. In addition, in the above-mentioned tubular indwelling device placement technique, it is important to correctly grasp the position and opening state of the tubular indwelling device. For this reason, the tubular indwelling device may be provided with a contrast member made of a metal having contrast properties, for example. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-89958 Summary of the Invention [Problem to be solved by the invention]

[0005] When the tubular indwelling device is loaded into the indwelling device, if the contrast agent comes into contact with the inner surface of the sheath, the resistance to ejection of the tubular indwelling device increases, which may cause problems when ejecting the tubular indwelling device.

[0006] Therefore, the present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an indwelling device with a tubular indwelling device in which a contrast medium is less likely to come into contact with the inner surface of a sheath. [Means for solving the problem]

[0007] The indwelling device with a tubular retainer according to one embodiment of the present invention comprises a tubular retainer that is retained in a living lumen and is radially expandable and contractable, and a long retaining device that detachably holds the tubular retainer and introduces the tubular retainer into the living lumen. The retaining device has a sheath capable of housing the tubular retainer, and a long shaft-shaped member that is disposed inside the sheath and configured to be capable of advancing and retreating along the axial direction. The tubular retainer has an annular skeleton formed by hooking wires that are folded back in the axial direction and braiding the wires in a lattice shape, and a contrast member attached to the wires. The annular skeleton is folded so that the gaps of the lattice are narrowed, and is housed in the sheath in a state in which at least one of the hooked wires is disposed at an angle relative to the radial direction. The contrast member is attached to a portion of the wires of the annular skeleton housed in the sheath that faces the shaft-shaped member on the inner circumference side. Effect of the Invention

[0008] According to one aspect of the present invention, it is possible to provide an indwelling device with a tubular indwelling device in which the contrast medium is less likely to come into contact with the inner surface of the sheath. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram showing an example of a catheter according to the present embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of a tubular indwelling device according to the present embodiment. [Diagram 3] FIG. 3 is an enlarged view of a first region of the tubular indwelling device shown in FIG. 2. [Figure 4] 3 is a plan view showing a portion of the second region of the tubular indwelling device shown in FIG. 2. FIG. [Diagram 5] FIG. 13 is a schematic diagram showing the state of the second region when the tubular indwelling device is housed in a sheath. [Figure 6] FIG. 6 is a cross-sectional view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an example of the configuration of a catheter according to an embodiment will be described with reference to the drawings. Note that the shapes, dimensions, etc. of each part in the drawings are shown only for illustrative purposes and do not represent the actual shapes, dimensions, etc.

[0011] In the following description, the side of the catheter farther from the operator is referred to as the distal side (or one side), and the side closer to the operator is referred to as the proximal side (or the other side). In Fig. 1, the longitudinal direction (axial direction) of the catheter is indicated by an arrow Ax as appropriate. The direction approximately perpendicular to the longitudinal direction is defined as the radial direction, and the rotational direction around the longitudinal direction is defined as the circumferential direction.

[0012] Fig. 1 is a diagram showing an example of a catheter 1 of this embodiment. Fig. 1(a) is an exploded view of the catheter 1, and Fig. 1(b) is a diagram showing the assembled state of Fig. 1(a). Fig. 2 is a diagram showing an example of a tubular indwelling device of this embodiment.

[0013] The tubular indwelling device 2 of this embodiment is a tubular treatment device that can expand and contract in the radial direction. The tubular indwelling device 2 is placed in a lesion site such as a narrowed or blocked part in a biological lumen (not shown) and is used to expand the diameter of the lesion site. The catheter 1 of this embodiment is an example of an indwelling device, and is used to place the tubular indwelling device 2 in a target placement site in a biological lumen.

[0014] First, with reference to FIG. 1, an example of the configuration of the catheter of this embodiment will be described. The catheter 1 includes a tubular sheath 3 and a tubular inner tube 4 disposed inside the sheath 3 .

[0015] The sheath 3 can house the tubular indwelling device 2 in a contracted state inside. The sheath 3 has a sheath body 3a and an operation unit 3b provided at the proximal end of the sheath body 3a. The operation unit 3b may have a nut 3c for fixing the sheath 3 to the inner tube 4, an operation member (not shown) for operating a linear member (not shown) that restrains the tubular indwelling device 2 to the inner tube 4, etc.

[0016] The sheath body 3a is a tube made of a flexible material, and examples of the material for the sheath body 3a include biocompatible synthetic resins (elastomers) selected from fluororesins, polyamide resins, polyethylene resins, polyvinyl chloride resins, and the like, resin compounds in which these resins are mixed with other materials, multilayer structures made of these synthetic resins, and composites of these synthetic resins and metal wires.

[0017] The inner tube 4 is an axial member longer than the sheath 3 and configured to be movable forward and backward along the axial direction Ax. The inner tube 4 has a tube main body 4a and a tube small diameter portion 4b formed on the distal side of the tube main body 4a. Examples of materials for the inner tube 4 include various materials having appropriate rigidity and flexibility, such as resins (plastics, elastomers, etc.) and metals.

[0018] The small diameter tube section 4b is coaxial with the tube main body 4a and has a smaller diameter than the tube main body 4a. In the catheter 1, the tubular indwelling device 2 is housed in a space formed between the outer periphery of the small diameter tube section 4b and the inner periphery of the sheath main body 3a. In addition, the tube main body 4a and the small diameter tube section 4b of the inner tube 4 are each formed along the axial direction Ax with a lumen for inserting a guidewire and a lumen for flowing physiological saline for washing the catheter 1 (neither shown).

[0019] A tip 4c that closes the distal end opening of the sheath 3 is attached to the distal end of the tube small diameter section 4b. The diameter of the tip 4c is larger than that of the inner tube 4, and the distal side of the tip 4c has a tapered shape that gradually tapers toward the distal side.

[0020] Meanwhile, a grip member (not shown) for the operator to operate is attached to the proximal side of the inner tube 4. When releasing the tubular indwelling device 2 from the catheter 1, the operator, for example, grasps the grip member to operate the inner tube 4. The operator also holds the operation section 3b on the tip side and performs an operation to move the sheath 3 so as to pull it out towards the proximal side while maintaining the position of the inner tube 4. By these operations, the tubular indwelling device 2 can be released from the sheath 3.

[0021] Next, with reference to Figs. 2 to 6, a configuration example of the tubular indwelling device 2 of this embodiment will be described in detail. The overall shape of the tubular indwelling device 2 is formed into a tube in which one end side and the other end side in the axial direction Ax are connected. When the tubular indwelling device 2 is placed, the inner surface of the placement site (lesion site of the biological lumen) is pressed radially outward by the outer circumferential surface of the tubular indwelling device 2. As a result, the lesion site that has narrowed inward so as to block the biological lumen is pushed radially outward.

[0022] The tubular retaining device 2 has a so-called self-expanding configuration in which the shape of the expanded state is memorized, and can expand and contract from a contracted state contracted radially inward to an expanded state expanded radially outward. The tubular retaining device 2 of this embodiment is introduced into a living lumen in a state contracted radially inward using a catheter 1. After being delivered to a lesion site in a living lumen, the tubular retaining device 2 is released from the catheter 1 and expands radially outward. The tubular retaining device 2 released from the catheter 1 may be expanded radially outward by pressing the tubular retaining device 2 from the inside by expanding a balloon (not shown).

[0023] The tubular indwelling device 2 of this embodiment has a first region 11 and a second region 12 which have different rigidities in the axial direction Ax. The first region 11 is located at the axial center of the tubular indwelling device 2, and faces a diseased site of the biological lumen when the tubular indwelling device 2 is indwelled. The second regions 12 are respectively disposed at both axial ends of the tubular indwelling device 2 so as to sandwich the first region 11 along the axial direction Ax. Each of the second regions 12 faces a normal site (non-lesion site) of the biological lumen when the tubular indwelling device 2 is indwelled.

[0024] Additionally, a flared portion 13 that widens in diameter toward the other side is formed in the second region 12 on the other side of the tubular retaining device 2. The flared portion 13 serves to suppress displacement (migration) of the tubular retaining device 2 by generating friction between the tubular retaining device 2 and the inner wall of the biological lumen when the tubular retaining device 2 is retained.

[0025] FIG. 3 is an enlarged view of the first region 11 of the tubular indwelling device 2 shown in FIG. The first region 11 has a plurality of annular formation parts 14 formed of a metal wire having a predetermined rigidity, and a string member 15 attached to the annular formation parts 14, and the skeleton part is formed by combining two types of wire. Examples of materials for the metal wire of the first region 11 include known metals or metal alloys such as Ni-Ti alloy (nitinol), stainless steel, and titanium alloy. In addition, the metal wire of the first region 11 may be formed into a linear shape by laser cutting a thin-walled cylinder made of the above-mentioned various metals. When a Ni-Ti alloy is used as the skeleton material, the skeleton can be adjusted to the expanded shape and then subjected to a predetermined heat treatment, thereby causing the first region 11 to memorize the expanded shape.

[0026] The string member 15 of the first region 11 is made of a resin material that is less rigid than a metal wire and has biocompatibility. As an example, the string member 15 is made of a resin material such as polyethylene (PE) resin, fluororesin such as PTFE (polytetrafluoroethylene), polyester resin such as polyethylene terephthalate, or nylon.

[0027] The multiple annular formation parts 14 are arranged in the first region 11 in a line in the axial direction. Each annular formation part 14 is formed in an annular shape by extending a metal wire along the circumferential direction of the tubular indwelling device 2. In the annular formation part 14, the metal wire is bent in a zigzag shape in the axial direction so that peaks 14a and valleys 14b are alternately formed at a predetermined pitch. The annular formation parts 14 in the first region 11 expand in diameter in the circumferential direction by their own expansion force, and serve to expand the indwelling site.

[0028] The adjacent annular forming portions 14 on one side and the other side in the axial direction are arranged such that the positions of the folded-back portions (peak portions 14a) protruding on one side and the folded-back portions (valley portions 14b) protruding on the other side are approximately overlapped in the axial direction. Each annular forming portion 14 has a transition portion 14c that connects the annular forming portions 14 with a metal wire in order to transfer the metal wire to the adjacent annular forming portions 14 in the axial direction.

[0029] Furthermore, among the multiple annular forming portions 14, for example, two annular forming portions 14 that are not adjacent in the axial direction are connected in the axial direction by a string member 15. As shown in Fig. 3, the annular forming portions 14 are connected to the annular forming portion 14 that is one annular forming portion 14 away in the axial direction by the string member 15, straddling the adjacent annular forming portions 14. These two annular forming portions 14 are connected by the string member 15 at the peak portion 14a of one annular forming portion 14 and the valley portion 14b of the other annular forming portion 14. As a result, the string member 15 is arranged in a ring shape in a pattern that is folded back in the axial direction between the two annular forming portions 14.

[0030] The string members 15 of the first region 11 connect the annular formation parts 14 in the axial direction while allowing bending of the tubular indwelling device 2 in the axial direction and displacement of the annular formation parts 14 in the circumferential direction, and serve to maintain the overall shape of the first region 11 in a tubular shape. Furthermore, in the first region 11, by combining a metal wire and the string members 15, the amount of metal is reduced, and the flexibility of the tubular indwelling device 2 is increased. In the first region 11, the annular formation portion 14 of the metal wire and the string member 15 cross to form a mesh in the tubular indwelling device 2. In the first region 11, the mesh formed by the metal wire and the string member can suppress the infiltration of biological tissue into the inside of the tubular indwelling device 2.

[0031] Figures 4(a) and (b) are plan views showing a part of the second region 12 of the tubular indwelling device 2 shown in Figure 2. The up-down direction in Figure 4 corresponds to the circumferential direction of the second region 12, and the left-right direction in Figure 4 corresponds to the axial direction Ax. Note that Figure 4 shows the configuration of the other side of the second region 12 having the flared portion 13 as an example, and the left side of Figure 4 corresponds to the other side.

[0032] The second region 12 of the tubular indwelling device 2 has an annular skeleton 17 in which wires 16 made of metal wires are braided in a lattice shape. Examples of materials for the wires 16 include known metals or metal alloys such as Ni-Ti alloys, stainless steel, and titanium alloys. In the second region 12, the amount of metal in the wire is greater and the rigidity of the framework is higher than in the first region 11 that uses the string member 15. Therefore, by providing the second region 12 at the end of the tubular indwelling device 2, displacement of the tubular indwelling device 2 after placement is suppressed.

[0033] The wire rod 16 constituting the annular skeleton 17 of the second region 12 is folded back in the axial direction in a zigzag pattern so that peaks 17a and valleys 17b are alternately formed. Between adjacent stages on one side and the other side in the axial direction, a folded back portion (valley portion 17b) protruding to the other side in the stage on one side of the wire rod 16 faces a folded back portion (peak portion 17a) protruding to one side in the stage on the other side of the wire rod 16.

[0034] In adjacent stages of the annular skeleton 17, the folded portions (peaks 17a, valleys 17b) of the opposing wires 16 are hooked to each other. As a result, in the second region 12, the wires 16 of the annular skeleton 17 are braided to form a diamond-shaped lattice. In the annular skeleton 17, the folded portions of the hooked wires 16 are not constrained and can move freely relative to each other. When the tubular retaining device 2 is reduced in diameter, the annular skeleton 17 of the second region 12 is folded such that the gaps in the lattice are reduced in the circumferential direction as shown in FIG. 4(b) compared to the state in FIG. 4(a).

[0035] Fig. 5 is a schematic diagram showing the state of the second region 12 when the tubular indwelling device 2 is housed in the sheath 3. Fig. 6 is a cross-sectional view taken along a plane perpendicular to the axial direction of Fig. 5.

[0036] When the tubular indwelling device 2 is housed in the sheath 3, the wire 16 is displaced so as to narrow the gaps in the lattice in the circumferential direction, and the wire 16 of the first-stage annular skeleton 17, which has a high expansive force in the flared portion 13, is displaced so that the linear portions 17c located in the middle of the folds cross. Meanwhile, the linear portions 17c connecting the peaks 17a and valleys 17b are bent so as to bulge in a curved shape due to the reaction force of the wire 16. Therefore, as shown in FIG. 5, the wire 16 of the folded first-stage annular skeleton 17 is displaced so that the wire 16 crosses at the linear portions 17c, and is disposed in the sheath 3 in a twisted state in the shape of a figure eight. The intersections 17d of the linear portions 17c of the first-stage wire 16 are more likely to be formed near the outer edge of the first stage (valleys 17b) than near the hooking portions (peaks 17a) with the second-stage wire 16.

[0037] 6, the wire rods 16 of the first stage annular skeleton portion 17 housed in the sheath 3 are arranged so that the folded wire rods 16 are inclined with respect to the radial direction and adjacent wire rods 16 partially overlap each other in a clockwise direction. The wire rods 16 of the second stage annular skeleton portion 17, which are hooked onto the first stage wire rods 16 and arranged axially inward from the first stage, are also housed in the sheath 3 with the folded wire rods inclined with respect to the radial direction, similar to the first stage.

[0038] 4 and 5, radiopaque markers 18, an example of a radiopaque member, are attached to the wires 16 of the annular skeleton 17 in the second region 12. By attaching the radiopaque markers 18 to the second region 12, it becomes possible to observe the end position and end shape of the tubular indwelling device 2 from the outside using an X-ray image.

[0039] The radiopaque marker 18 is made of a metal material having high biocompatibility and contrast properties, such as tungsten, platinum, stainless steel, etc. As an example, the radiopaque marker 18 is formed into a pipe shape by winding a thin sheet of the above-mentioned metal material around the wire 16. The radiopaque marker 18 may also serve as a crimping member that connects the ends of the wire together.

[0040] The radiopaque marker 18 is attached to at least one of the wire 16 of the first stage annular skeleton portion 17 and the wire 16 of the second stage annular skeleton portion 17 in order to detect the end position and end shape of the tubular indwelling device 2. The attachment position of the radiopaque marker 18 on the wire 16 of the first stage annular skeleton portion 17 or the wire 16 of the second stage annular skeleton portion 17 is set to a portion facing the inner tube 4 on the inner periphery side when housed in the sheath 3. In other words, when the tubular indwelling device 2 is housed in the sheath 3, the radiopaque marker 18 is disposed at a position away from the inner periphery of the sheath 3.

[0041] For example, when the radiopaque marker 18 is located near the inner surface of the sheath 3, the radiopaque marker 18 in the sheath 3 is pressed against the inner surface of the sheath 3 by the expansion force of the annular skeleton portion 17. This may cause the step between the radiopaque marker 18 and the wire 16 to come into contact with and get caught on the inner surface of the sheath 3, increasing the resistance to ejection of the tubular indwelling device 2. In particular, when the expansion force of the annular skeleton portion 17 is large, such as in the flared portion 13, the above-mentioned resistance to ejection may become even higher. In contrast, when the radiopaque marker 18 is separated from the inner surface of the sheath 3 as in this embodiment, the radiopaque marker 18 is less likely to come into contact with the inner surface of the sheath 3 regardless of the expansion force of the annular skeleton portion 17. Therefore, in this embodiment, an increase in the release resistance of the tubular indwelling device 2 due to contact between the radiopaque marker 18 and the sheath 3 is suppressed.

[0042] For example, when attaching a contrast marker 18 to the wire 16 of the first-stage annular skeletal portion 17 that intersects in an eight-shape within the sheath 3, the attachment position of the contrast marker 18 is set to at least one of two regions (R1, R2) located on the inner side of the intersection 17d of the linear portion 17c, as shown by the dashed line in Figure 5.

[0043] As described above, in the first-stage annular skeleton portion 17, the intersection 17d of the linear portion 17c is likely to be formed on the outer edge side of the first stage in the axial direction, in other words, a large space is likely to be formed in the axial direction from the intersection 17d to the second-stage annular skeleton portion 17. Therefore, although not particularly limited, it is preferable that the radiopaque marker 18 is attached to the region R2 which is a region facing the inner tube 4 on the inner periphery side and faces the intersection 17d of the linear portion 17c and the hooking portion with the second-stage annular skeleton portion 17. As described above, when the radiopaque marker 18 is arranged in the region R2 which is relatively wider in the axial direction than the region R1 in the first stage, the layout of the radiopaque marker is improved, and it is also easy to increase the size of the radiopaque marker 18 and improve the visibility during imaging.

[0044] On the other hand, when attaching radiopaque marker 18 to the wire of second stage annular skeleton 17, the attachment position of radiopaque marker 18 is preferably set in a region facing inner tube 4 on the inner periphery side, region R3 of the second stage that is spaced radially away from the hooking portion, as shown by the dashed line in Figure 5. When radiopaque marker 18 is attached to the above region R3, radiopaque marker 18 is disposed near first stage annular skeleton 17, so that the end position and end shape of tubular indwelling device 2 can be observed from the outside in almost the same way as when radiopaque marker 18 is attached to the first stage.

[0045] The operation of this embodiment will be described below. The catheter with a tubular retaining device of this embodiment includes a tubular retaining device 2 that is retained in a living lumen and is radially expandable and contractible, and a long catheter (retaining device) 1 that detachably holds the tubular retaining device 2 and introduces the tubular retaining device 2 into the living lumen. The catheter 1 includes a sheath 3 that can accommodate the tubular retaining device 2, and a long inner tube (axial member) 4 that is arranged inside the sheath 3 and is configured to be able to advance and retreat along the axial direction. The tubular retaining device 2 includes an annular skeleton 17 formed by hooking wires 16 that are folded back in the axial direction and braiding the wires 16 in a lattice shape, and a contrast marker (contrast member) 18 attached to the wires 16. The annular skeleton 17 is folded so that the gaps of the lattice are narrowed, and is accommodated in the sheath 3 in a state in which at least one of the hooked wires is arranged at an angle to the radial direction. The radiopaque marker 18 is attached to a portion of the wire 16 of the annular skeleton portion 17 housed within the sheath 3, the portion facing the inner tube 4 on the inner periphery side. According to this embodiment, when the tubular indwelling device 2 is housed in the catheter 1, the radiopaque marker 18 of the tubular indwelling device 2 is separated from the inner surface of the sheath 3, making it difficult for the two to come into contact. Therefore, resistance to the release of the tubular indwelling device 2 caused by contact between the radiopaque marker 18 and the sheath 3 is unlikely to occur, improving the operability of the catheter 1.

[0046] Furthermore, in this embodiment, since the radiopaque marker 18 is disposed at a position away from the inner circumference of the sheath 3, even if a larger radiopaque marker 18 than conventionally used is used, there is no hindrance to the release of the tubular indwelling device 2. In other words, in this embodiment, the radiopaque marker 18 can be made larger, which makes it possible to improve the contrast and reduce the amount of rare metal used in the radiopaque marker 18.

[0047] The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.

[0048] In the above embodiment, a tubular indwelling device 2 having a partial region where a metal wire and a string member are combined has been described, but the tubular indwelling device of the present invention is not limited to the above configuration example. For example, the tubular indwelling device of the present invention may be configured by braiding wires in a lattice shape over the entire axial direction.

[0049] Furthermore, in the above embodiment, a tubular indwelling device having flared portion 13 at its end has been described, but the tubular indwelling device of the present invention may be configured not to have flared portion 13. Furthermore, in the above embodiment, the wire diameter of the first stage of wire located at the end may be made thicker than the wire diameters of the other stages of wire on the axially inner side, thereby increasing the expansive force of the first stage of wire.

[0050] In addition, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0051] The disclosure of the above embodiment encompasses the following technical ideas. (1) An indwelling device with a tubular retention device, comprising: a tubular retention device that is placed in a biological lumen and is radially expandable and contractable; and a long retention device that detachably holds the tubular retention device and introduces the tubular retention device into the biological lumen, wherein the retention device has a sheath that can house the tubular retention device, and a long axial member that is placed inside the sheath and configured to be able to advance and retreat along the axial direction, the tubular retention device has an annular skeleton formed by hooking together wires that are folded back in the axial direction and braiding the wires in a lattice shape, and a contrast member attached to the wires, the annular skeleton being folded so that gaps in the lattice are narrowed, and the retention device is housed within the sheath in a state in which at least one of the hooked wires is arranged at an angle relative to the radial direction, and the contrast member is attached to a portion of the wires of the annular skeleton housed within the sheath that faces the axial member on the inner periphery. (2) The annular skeleton portion is formed by hooking together wire material folded back in a zigzag shape, and has a first stage that is arranged at an end of the annular skeleton portion, and a second stage that is hooked onto the first stage and arranged axially inward from the first stage, and the contrast member is attached to at least one of the wire material of the first stage and the second stage. (3) The retention device with tubular retention device described in (2) above, wherein the folded first stage is accommodated within the sheath in a shape in which wires cross at the midpoint of the fold, and the contrast member is attached on the inner side of the crossing point of the wires of the first stage. (4) The retention device with tubular retention tool according to (3) above, wherein the contrast member is attached to a region facing an intersection portion of the first tier of wire rods and a hook portion of the second tier. (5) The retention device with tubular retention tool according to any one of (1) to (4) above, wherein the contrast member also serves as a crimping member for connecting the ends of the wire. (6) The retention device with tubular retention tool according to any one of (1) to (5) above, wherein the material of the wire is Nitinol. (7) The retention device with tubular retention device according to any one of (1) to (6) above, wherein the annular skeleton portion has a main body portion and a flared portion formed at an end of the main body portion and having a larger diameter than the main body portion, and the contrast member is attached to a wire of the flared portion. (8) The retention device with tubular retention device according to any one of (1) to (7) above, wherein the tubular retention device has a first region located at the center in the axial direction and a second region located at an end in the axial direction and having the annular skeleton, the first region having a tubular skeleton formed by combining a metal wire having a predetermined rigidity with a string member having a lower rigidity than the metal wire, and the contrast member is attached to the wire of the annular skeleton of the second region. [Explanation of symbols]

[0052] 1...catheter (indwelling device), 2...tubular indwelling device, 3...sheath, 4...inner tube (axial member), 11...first region, 12...second region, 13...flare portion, 14...annular forming portion, 15...string member, 16...wire material, 17...annular skeletal portion, 18...contrast marker (contrast member)

Claims

1. a tubular indwelling device that is placed in a living body lumen and is radially expandable and contractible; a long indwelling device that detachably holds the tubular indwelling device and introduces the tubular indwelling device into the biological lumen; An indwelling device with a tubular indwelling device comprising: The indwelling device includes a sheath capable of accommodating the tubular indwelling device; a long shaft-shaped member disposed inside the sheath and configured to be movable forward and backward along an axial direction; The tubular indwelling device is a ring-shaped skeleton portion formed by braiding wires in a lattice shape by hooking wires folded back in an axial direction; a contrast member attached to the wire; The annular skeleton portion is folded so that the gaps of the lattice are reduced, and at least one of the wire rods to be hung is accommodated in the sheath in a state in which it is disposed inclined with respect to a radial direction, The contrast member is attached to a portion of the wire of the annular skeleton housed in the sheath, the portion facing the shaft-shaped member on the inner periphery side. A retention device with a tubular retention tool.

2. the annular skeleton portion is formed by hooking together wire rods folded back in a zigzag shape, and has a first stage disposed at an end of the annular skeleton portion, and a second stage hooked onto the first stage and disposed axially inward of the first stage, The contrast member is attached to at least one of the first and second stages of wire. The indwelling device with a tubular indwelling device according to claim 1.

3. The folded first stage is displaced to a shape in which the wires cross at a middle portion of the fold and is accommodated in the sheath, The contrast member is attached on the inner circumferential side of the intersection of the first stage wires. The indwelling device with a tubular indwelling device according to claim 2.

4. The contrast member is attached to a region facing an intersection of the first stage wire rods and a hook portion of the second stage wire rods. The indwelling device with a tubular indwelling device according to claim 3.

5. The contrast member also serves as a crimping member for connecting the ends of the wire. The indwelling device with a tubular indwelling device according to any one of claims 1 to 4.

6. The wire material is Nitinol. The indwelling device with a tubular indwelling device according to any one of claims 1 to 4.

7. The annular skeleton portion has a main body portion and a flare portion formed at an end portion of the main body portion and having a larger diameter than the main body portion, The contrast member is attached to the wire of the flared portion. The indwelling device with a tubular indwelling device according to any one of claims 1 to 4.

8. The tubular indwelling device has a first region located at a center in an axial direction, and a second region located at an end in an axial direction and having the annular skeleton portion, The first region has a tubular skeleton formed by combining a metal wire having a predetermined rigidity and a string member having a lower rigidity than the metal wire, The contrast member is attached to the wire of the annular skeleton of the second region. The indwelling device with a tubular indwelling device according to any one of claims 1 to 4.

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