Tubular indwelling device

Abstract

A tubular indwelling device capable of maintaining the shape of a wire rod provided along the circumference of the end of a connecting part is provided. [Solution] A tubular indwelling device 1 to be placed in a biological lumen 2 has a cylindrical connecting portion 12 into which another tubular indwelling device 3a is inserted and connected to the other tubular indwelling device 3a. The connecting portion 12 has an index member 21 provided at the end into which the other tubular indwelling device 3a is inserted. The index member 21 has multiple wires provided along the circumferential direction of the connecting portion 12, and the multiple wires are configured to form a roughly annular shape as a whole when the tubular indwelling device 1 is placed in the biological lumen 2.

Description

[Technical Field]

[0001] The present invention relates to a tubular indwelling device.

[0002] Tubular indwelling devices have been known for some time that are placed at a lesion, such as a stenosis or occlusion, in a biological lumen such as a blood vessel, and that expand the diameter of the lesion to maintain the patency of the biological lumen. Also known are bifurcated tubular indwelling devices for placement in, for example, the abdominal aorta, which branches into the left and right lower limbs (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-279532 Summary of the Invention [Problem to be solved by the invention]

[0004] This type of tubular indwelling device is housed in a cylindrical sheath and introduced into a living lumen in a state where it is contracted radially inward, and after being carried to the lesion site, it is released from the sheath and left in place. In addition, with the above-mentioned tubular indwelling device, a small-diameter tubular indwelling device (also called a rim) for covering the branched blood vessel is inserted into and connected to the opening of the branched part branched from the main body.

[0005] In the above-mentioned tubular indwelling device placement procedure, it is important to correctly grasp the end position and opening state of the branch when connecting the limb to the branch. For this reason, an indicator member made of, for example, a radiopaque metal wire may be provided around the periphery of the end of the branch.

[0006] When the above-mentioned indicator member is provided at a branched section, the tubular indwelling device is housed in the sheath so that the circumference of the indicator member contracts when introduced into a biological lumen, and therefore, it is necessary for the indicator member to return to its pre-contracted shape after release. However, it is actually difficult to stably deform an indicator member made of a metal wire so that it maintains its pre-contracted shape after release.

[0007] Therefore, the present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a tubular indwelling device that can maintain the shape of a wire rod provided along the circumference of the end of a connection part. [Means for solving the problem]

[0008] One aspect of the present invention is a tubular indwelling device to be placed in a biological lumen, and includes a cylindrical connecting portion into which another tubular indwelling device is inserted and connected to the other tubular indwelling device. The connecting portion has an index member provided at the end into which the other tubular indwelling device is inserted. The index member has multiple wires provided along the circumferential direction of the connecting portion, and the multiple wires are configured to form a substantially annular shape as a whole when the tubular indwelling device is placed in the biological lumen. [Effects of the Invention]

[0009] According to the present invention, the shape of the wire provided along the circumference of the end of the connection portion can be maintained. [Brief explanation of the drawings]

[0010] [Figure 1] 1A and 1B are diagrams showing an example of the configuration of a stent graft according to an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram showing a schematic diagram of a stent graft placed in a blood vessel. [Figure 3] FIG. 10 is a perspective view of the first branch portion as seen from the other end side. [Figure 4] FIG. 10 is a view showing the peripheral surface of the other end side of the first branch portion. [Figure 5] 4 is a schematic diagram showing a cross section of the other end side of the first branch portion. FIG. [Figure 6]FIG. 10 is a diagram showing the shape of the sheet before the film portion is sewn. [Figure 7] FIG. 10 is a perspective view of a first branch portion in a first modified example, viewed from the other end side. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, examples of the configuration of a tubular indwelling device according to an embodiment of the present invention will be described with reference to the drawings. Here, the shapes, dimensions, etc. of each part in the drawings are shown schematically and do not represent the actual shapes, dimensions, etc. In the drawings, the axial direction Ax of the member is indicated by an arrow as needed. Also, the direction approximately perpendicular to the axial direction Ax is defined as the radial direction. In the drawings, one end side of the member is indicated by the symbol F as needed, and the other end side opposite to the one end side is indicated by the symbol B as needed.

[0012] FIG. 1 is a diagram showing an example of the configuration of a stent graft 1 of this embodiment, and FIG. 2 is a diagram showing a schematic diagram of the stent graft 1 placed in a blood vessel 2. As shown in FIG.

[0013] The tubular indwelling device of this embodiment is a stent graft 1 that is placed in a lesion site (for example, a site where a blood vessel has developed aneurysm) of a blood vessel, which is an example of a biological lumen, and is used to block blood flow to the lesion site. As shown in Fig. 2, the stent graft 1 of this embodiment is placed in a blood vessel 2, such as the abdominal aorta, which branches into the left and right lower limbs.

[0014] The overall shape of stent graft 1 is a tube with the other end branching into two. Stent graft 1 has a tubular main body 11 with one end open, and first and second tubular branch portions 12, 13 that branch and extend from the other end of main body 11. First and second branch portions 12, 13 are examples of connecting portions.

[0015] The other ends of the first and second branch portions 12, 13 are each open. The opening of the main body 11 and the openings of the first and second branch portions 12, 13 are connected to each other, and the deployed stent graft 1 forms a tubular flow path therein through which the patient's blood passes. The diameters of the first and second branch portions 12 and 13 are smaller than the diameter of the main body portion 11. The axial length of the first branch portion 12 is shorter than the axial length of the second branch portion 13.

[0016] Furthermore, a bare portion 14 made of a metal skeleton is provided on one end side of the main body portion 11. The bare portion 14 protrudes outward from an opening on one end side of the main body portion 11. The bare portion 14 generates friction with the inner wall of the blood vessel 2 when the stent graft 1 is placed, and serves to suppress displacement (migration) of the stent graft 1.

[0017] Here, the stent graft 1 of this embodiment is introduced into a blood vessel 2 in a state (not shown) contracted radially inward using a catheter (not shown). After being delivered to a lesion site 2a in the blood vessel 2, the stent graft 1 is released from the sheath of the catheter and expands radially outward. The stent graft 1 released from the catheter may be expanded radially outward by compressing it with a balloon (not shown) from the inside. By placing the stent graft 1, blood flow to the lesion 2a formed in the branching blood vessel 2 is blocked.

[0018] After the stent graft 1 is placed, stent grafts (limbs 3a, 3b) for covering the branched blood vessels 2 (left and right iliac arteries) are connected to the first and second branch portions 12, 13 of the stent graft 1, respectively, as shown in Figure 2. The limbs 3a, 3b are an example of another tubular indwelling device, and have diameters corresponding to the first and second branch portions 12, 13. By inserting and connecting the limbs 3a, 3b to the first and second branch portions 12, 13 of the stent graft 1, respectively, it is possible to suppress the inflow of blood into the lesion site 2a without impeding the flow of blood from the upstream side to the downstream side in the branched blood vessel 2.

[0019] The limbs 3a and 3b are introduced into the blood vessel using a catheter, similar to the stent graft 1. For example, when connecting the limb 3a to the first branch 12, a guidewire (not shown) is passed through the first branch 12, and the catheter containing the limb 3a is advanced along the guidewire into the blood vessel 2. When releasing the limb 3a from the sheath, the catheter is positioned so that one end of the limb 3a overlaps with the first branch 12 in the axial direction, and the sheath is then withdrawn toward the other end, causing the limb 3a to expand radially outward. This connects the first branch 12 and limb 3a, and leaves the limb 3a in place to cover the branched blood vessel 2 from the inside.

[0020] Furthermore, the main body portion 11 and the first and second branch portions 12, 13 of the stent graft 1 each have a framework portion 15 and a coating portion 16.

[0021] The skeleton 15 is a self-expanding stent skeleton that is configured to be deformable from a contracted state contracted radially inward to an expanded state expanded radially outward. In this embodiment, the skeleton 15 is composed of multiple tubular skeleton pieces made of thin metal wires folded back in a zigzag pattern along the circumferential direction of the stent graft 1. The skeleton pieces of the skeleton 15 are arranged side by side along the axial direction Ax. Adjacent skeleton pieces may be connected to each other by a connecting member (not shown).

[0022] Examples of materials for the thin metal wires forming the skeleton 15 include known metals or metal alloys such as stainless steel, nickel-titanium alloy, cobalt-chromium alloy, and titanium alloy. When a nickel-titanium alloy is used as the material for the skeleton 15, the shape of the expanded state can be memorized in the skeleton 15 by adjusting each part to the expanded shape and then performing a predetermined heat treatment. The skeleton 15 may also be formed from a material other than metal (for example, ceramic, resin, etc.).

[0023] The structure of the skeleton 15 is not limited to the above, and for example, the skeleton 15 may be formed by spirally winding a zigzag-bent thin metal wire. Alternatively, the skeleton 15 may be formed by laser cutting a thin-walled cylinder made of any of the above metals.

[0024] The coating portion 16 is a cylindrical flexible film that forms the tubular flow path, and is attached to the skeleton portion 15 so as to close gaps in the skeleton portion 15. Examples of materials for the coating portion 16 include fluororesins such as PTFE (polytetrafluoroethylene), and polyester resins such as polyethylene terephthalate.

[0025] 6(a) and 6(b), the membrane portion 16 is formed into a three-dimensional cylindrical body by sewing together a front sheet 17a and a back sheet 17b cut to fit the shapes of the main body portion 11 and the first and second branch portions 12 and 13. Each of the sheets 17a and 17b constituting the membrane portion 16 is cut out so that the corresponding portions 12a and 12b of the first branch portion and the corresponding portions 13a and 13b of the second branch portion form an angle with respect to the corresponding portions 11a and 11b of the main body portion. In other words, the corresponding portions 12a and 12b of the first branch portion and the corresponding portions 13a and 13b of the second branch portion are not cut out linearly so as to be parallel to each other. If a sheet is used in which corresponding portions 12a, 12b of the first branch portion and corresponding portions 13a, 13b of the second branch portion are linearly cut out, the first branch portion 12 and the second branch portion 13 may cross each other inward after sewing. On the other hand, if sheets 17a, 17b as shown in Fig. 6 are used, the first branch portion 12 and the second branch portion 13 can be prevented from crossing each other inward after sewing.

[0026] In this embodiment, the coating 16 is attached to the inner periphery of the skeleton 15. However, the coating 16 may also be attached to the outer periphery of the skeleton 15, or two coatings 16 may be used to sandwich the skeleton 15 from the inner and outer periphery. The coating 16 may be fixed to the skeleton 15 by any method, such as sewing with thread, bonding, welding, or adhering with tape.

[0027] Fig. 3 is a perspective view of the first branch portion 12 as viewed from the other end side. Fig. 4 is a view showing the peripheral surface of the other end side of the first branch portion 12. Fig. 5 is a schematic view showing a cross section of the other end side of the first branch portion 12.

[0028] A gate marker 21, which is an example of an indicator member, is provided at the open end on the other end side of the first branch portion 12. The gate marker 21 is composed of a plurality of wires having contrast properties. Each of the wires constituting the gate marker 21 is arranged along the circumferential direction of the first branch portion 12. In this embodiment, the gate marker 21 is composed of three wires that divide the circumference into thirds. The number of wires in the gate marker 21 may be two, or may be four or more.

[0029] 3 and 5, the gate markers 21 form a generally circular shape when the stent graft 1 is indwelled. By arranging the gate markers 21 at the open end of the first branch portion 12 in this manner, the end position and end shape of the first branch portion 12 can be observed externally using an X-ray image.

[0030] The gate marker 21 is made of a metal that is highly biocompatible and has good contrast properties, such as tungsten, platinum, or stainless steel. However, the material of the gate marker 21 is not limited to the above, and any biocompatible metal material can be used.

[0031] At the end of the first branch portion 12, the coating portion 16 is folded back from the inside to the outside, and each gate marker 21 is enclosed and arranged inside the folded back portion of the coating portion 16. As shown in Fig. 5, at the end of the first branch portion 12, the gate markers 21 are arranged radially between the coating portion 16 on the inner periphery side and the folded back coating portion 16 on the outer periphery side.

[0032] 4, on the outer peripheral surface of the first branch portion 12 along the circumferential direction, the skeleton portion 15 located closest to the other end of the first branch portion 12 is spaced apart from the gate marker 21 in the axial direction and is disposed so as not to overlap the gate marker 21. At the end of the first branch portion 12, the skeleton portion 15 facing the gate marker 21 is located radially outward of the coating portion 16 on the outer peripheral side and is sewn to the outside of the coating portion 16. The gate marker 21 is enclosed in the coating portion and sewn to the tip of the valley portion 15a of the skeleton portion 15 protruding toward the other end.

[0033] As described above, the skeletal portion 15 facing the gate marker 21 and the gate marker 21 are indirectly connected to each other via the circumferential surface of the coating portion 16 while being spaced apart in the axial direction. Therefore, the gate marker 21 enclosed in the coating portion 16 can slide circumferentially relative to the skeletal portion 15.

[0034] Next, the movement of the gate marker 21 when the first branch portion 12 expands and contracts will be described. When the first branch portion 12 is contracted in the radial direction, the skeleton portion 15 is contracted in the radial direction by displacement of the adjacent peaks 15b and valleys 15a so that they approach each other in the circumferential direction. Then, the gate markers 21 connected to the valleys 15a of the skeleton portion 15 via the coating portion 16 are also displaced in conjunction with the skeleton portion 15 so as to contract in the radial direction as a whole.

[0035] When the first branch portion 12 contracts, the three gate markers 21 move closer to each other in the circumferential direction, and adjacent gate markers 21 partially overlap each other in the circumferential direction. In this way, the gate markers 21 move in the circumferential direction and overlap each other, thereby displacing into a shape contracted in the radial direction. In this embodiment, the gate marker 21 is divided into multiple parts in the circumferential direction, so that a deformation allowance for the gate marker 21 during contraction can be easily ensured.

[0036] At this time, each gate marker 21 enclosed in the coating portion 16 can slide circumferentially relative to the skeletal portion 15. In other words, when the skeletal portion 15 contracts in diameter, the connection position of the gate marker 21 with the skeletal portion 15 can move circumferentially. Therefore, when the skeletal portion 15 contracts in diameter, the gate markers 21 are restrained by the skeletal portion 15 and are prevented from deforming irregularly in the axial direction, and the gate markers 21 can maintain their shape extending along the circumferential direction.

[0037] On the other hand, when the first branch portion 12 expands in the radial direction, the skeleton portion 15 self-expands by displacing adjacent peaks 15b and valleys 15a apart in the circumferential direction. Then, the gate markers 21 connected to the valleys 15a of the skeleton portion 15 via the coating portion 16 also displace in conjunction with the skeleton portion 15 so as to expand radially as a whole.

[0038] When the first branch portion 12 expands, the gate markers 21, which are partially overlapping in the circumferential direction, move apart in the circumferential direction. Because the gate markers 21 maintain a shape extending in the circumferential direction during contraction, adjacent gate markers 21 can move without interfering with each other during the above movement, and can easily return to their original shape during expansion. In this way, the gate markers 21 can stably deform from a contracted state to an expanded state, and can maintain a generally annular shape as a whole during expansion.

[0039] The effects of the stent graft 1 of this embodiment will be described below. In this embodiment, the stent graft 1 (tubular indwelling device) placed in the blood vessel 2 (biological lumen) has a tubular first branch portion 12 (connecting portion) into which a limb 3a (another tubular indwelling device) is inserted and connected to the limb 3a. The first branch portion 12 has a gate marker 21 (indicator member) provided at the end into which the limb 3a is inserted. The gate marker 21 has multiple wires provided along the circumferential direction of the first branch portion 12, and the multiple wires are configured to form a generally annular shape as a whole when the stent graft 1 is placed in the blood vessel 2. By configuring the gate marker 21 with a plurality of wires arranged along the circumferential direction of the first branch portion 12, the wires can move circumferentially and overlap each other during contraction. Then, during expansion, the wires move circumferentially, allowing the entire device to return to a generally annular shape. Therefore, according to this embodiment, the shape of the gate marker 21 arranged along the circumference of the end of the first branch portion 12 can be maintained.

[0040] The first branch portion 12 of this embodiment further includes a skeleton portion 15 that is spaced apart from the gate marker 21 in the axial direction and is expandable and contractable in a radial direction that is substantially perpendicular to the axial direction, and a coating portion 16 (peripheral surface portion) that is provided along the circumferential direction of the first branch portion 12 and is provided so as to cover the skeleton portion 15. The gate marker 21 and the skeleton portion 15 are connected via the coating portion 16. By connecting the gate marker 21 and the skeleton 15, the expansion force generated when the skeleton 15 undergoes expansion and deformation is transmitted to the gate marker 21, and the gate marker 21 can be displaced in conjunction with the expansion and deformation of the skeleton 15. This allows the shape of the wire material of the gate marker 21 provided along the circumference of the end of the first branch 12 to be maintained while the stent graft 1 is placed in the blood vessel 2. Furthermore, the gate marker 21 and the skeleton 15 are connected via the coating 16, which allows the gate marker 21 to slide relative to the skeleton 15. This prevents the gate marker 21 from being constrained by the skeleton 15 and deforming irregularly in the axial direction when the skeleton 15 contracts in diameter. As a result, the gate marker 21 can maintain a shape that extends along the circumferential direction even during contraction, allowing for stable deformation of the gate marker 21.

[0041] 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.

[0042] In the above embodiment, an example has been described in which the gate marker 21 is provided at the first branch portion 12 of the stent graft 1. However, a gate marker 21 may also be provided at the open end of the second branch portion 13 in the same manner.

[0043] In the above embodiment, the gate marker 21 and the skeleton 15 are connected via the coating 16, but the configuration for connecting the gate marker 21 and the skeleton 15 is merely an example and is not limited to this, and can be changed as appropriate. For example, the gate marker 21 and the skeleton 15 may be connected using a member (not shown) other than the coating 16 provided along the circumferential direction of the first branch portion 12.

[0044] In addition, in the above embodiment, a bifurcated stent graft 1 to be placed in the abdominal aorta was exemplified as the tubular indwelling device, but the shape of the tubular indwelling device is only an example and is not limited to this, and it may be, for example, a straight tube. In other words, the tubular indwelling device may have any shape as long as it has a tubular connecting portion into which another tubular indwelling device is inserted and connected to the other tubular indwelling device.

[0045] Furthermore, in the above embodiment, a configuration using multiple radiopaque wires as gate markers was shown, but the configuration of the gate marker applied to the tubular indwelling device is not limited to this. For example, as a modification of the above embodiment, a gate marker with the following configuration may be applied to the tubular indwelling device. In the following description of the modification, components common to the above embodiment will be assigned the same reference numerals and redundant description will be omitted.

[0046] FIG. 7 is a perspective view of the first branch portion 12 in the first modified example, viewed from the other end. The gate marker of the first modified example is composed of a coil member 22 formed by winding contrast-enhancing wire material into a cylindrical shape at a predetermined pitch. The coil member 22 is formed by winding a thin-diameter wire material to form a large-diameter coil with gaps. Therefore, compared to a gate marker directly formed with wire material having the same diameter as the outer diameter of the coil, the coil member 22 ensures visibility in X-ray images while reducing the amount of metal, thereby reducing the filling rate inside the sheath. Furthermore, because the coil member 22 is formed with wire material having a diameter smaller than the outer diameter of the coil, it is more easily bent than a gate marker directly formed with wire material having the same diameter as the outer diameter of the coil. Furthermore, the coil member 22 can relatively easily transition from a bent state to its unbent state due to the restoring force of the coil.

[0047] In the example of Fig. 7, three coil members 22 are arranged at the open end on the other end side of the first branch portion 12. Each coil member 22 extends along the circumferential direction of the first branch portion 12 and is arranged so that adjacent coil members 22 do not overlap each other. Furthermore, each coil member 22 is wrapped in the coating portion 16 and sewn to the distal end side of the valley portion 15a of the skeletal portion 15 protruding toward the other end side. As a result, when the stent graft 1 is indwelled, the three coil members 22 as a whole form a substantially annular shape. The number of coil members 22 may be two, four or more.

[0048] Furthermore, metals with high biocompatibility and contrast properties, such as tungsten, platinum, and stainless steel, are used as the material for the coil member 22. However, the material for the coil member 22 is not limited to the above, and any biocompatible metal material can be used.

[0049] Here, when the first branch portion 12 is contracted in the radial direction, the skeleton portion 15 is displaced so that adjacent peaks 15b and valleys 15a approach each other in the circumferential direction, thereby contracting in the radial direction. Then, the coil member 22 held by the coating portion 16 is deformed so as to be folded in accordance with the displacement of the skeleton portion 15, corresponding to the contracted state of the first branch portion 12. At this time, a portion of the coil member 22 may stretch in the axial direction of the coil when bent. Note that the coil member 22 is divided into multiple portions in the circumferential direction of the first branch portion 12, ensuring a deformation allowance between the coil members 22. Therefore, excessive stretching and plastic deformation of the coil member 22 during contraction is suppressed.

[0050] On the other hand, when the first branch portion 12 expands in the radial direction, the skeletal portion 15 self-expands by displacing adjacent peaks 15b and valleys 15a away from each other in the circumferential direction. Then, the coil members 22 move from their folded state toward their pre-bent state due to the restoring force of the coil members 22 themselves. Furthermore, the movement of the coating portion 16 linked to the skeletal portion 15 positions each of the coil members 22 held by the coating portion 16 in a generally annular shape as a whole. In this way, the coil members 22 stably deform from a contracted state to an expanded state, and can maintain a generally annular shape as a whole during expansion.

[0051] In addition, in the first modified example, the combination of wire diameter and pitch width of the coil member 22 is preferably determined taking into consideration the visibility in X-rays and the sheath filling rate. For example, if the wire diameter is reduced or the pitch width is increased, the sheath filling rate decreases, but the visibility in X-ray images also decreases. On the other hand, if the wire diameter is increased or the pitch width is reduced, the visibility in X-ray images improves, but the sheath filling rate also increases. Although not particularly limited, it is preferable that the wire diameter of the coil member 22 is about 0.0075 mm to 0.060 mm, for example. Also, it is preferable that the pitch width of the coil member 22 is about 0.046 mm to 3.0 mm, for example.

[0052] As a second modified example, although not shown in the drawings, the gate markers arranged in multiple numbers along the circumferential direction of the first branch portion 12 may be formed into a flat line shape. In the second modified example, the gate marker is more likely to bend because the dimension in the short cross-sectional direction (thickness of the gate marker) is reduced by flattening the line. Therefore, the gate marker can be easily folded during contraction. Furthermore, the dimension in the long cross-sectional direction (width of the gate marker) is increased by flattening the line, which ensures the visibility of the gate marker in X-ray images. Furthermore, by reducing the cross-sectional area of ​​the gate marker by flattening the line, the amount of metal in the gate marker can be reduced, thereby lowering the sheath filling rate. When the gate marker is made flat, the material of the gate marker may be the same as that described above, and for example, a flat marker made of gold (Au) may be used. In addition, the flat line gate marker may be formed in a coil shape as in the first modified example, which allows for greater freedom in the orientation of the imaging means relative to the gate marker when capturing an X-ray image, and further improves the visibility of the X-ray image.

[0053] As a third modified example, although not shown, the diameters of multiple gate markers arranged circumferentially of the first branch portion 12 may be varied at regular intervals along the circumferential direction. For example, the portions of the gate marker corresponding to the valleys 15a of the skeleton portion 15 may be made thinner, thereby suppressing interference between the valleys 15a of the skeleton portion 15 and the gate marker in the thinner diameter portions and reducing the amount of metal in the gate marker. Furthermore, the thicker diameter portions of the gate marker can ensure visibility in X-ray images.

[0054] As a fourth modified example, although not shown, the gate markers arranged in the circumferential direction of the first branch portion 12 may be formed in a wavy line shape that follows the valleys 15a and peaks 15b of the skeleton portion. In the fourth modified example, forming the gate markers in a wavy line shape makes it possible to avoid interference with the skeleton portion 15. In addition, in the fourth modified example, it is also possible to provide the gate markers between the skeleton portions. When the gate markers are provided between the skeleton portions, it is not necessary to fold back the coating portion 16 to hold the gate markers, and therefore the filling rate in the sheath can be reduced.

[0055] Furthermore, 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 by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0056] 1... stent graft (tubular indwelling device), 2... blood vessel (biological lumen), 2a... lesion site, 3a, 3b... limbs (other tubular indwelling devices), 11... main body portion, 12... first branch portion (connection portion), 13... second branch portion, 14... bare portion, 15... skeleton portion, 16... coating portion, 17a, 17b... sheet, 21... gate marker (indicator member), 22... coil member

Claims

1. A tubular indwelling device to be placed in a living body lumen, a cylindrical connecting portion into which another tubular indwelling device is inserted and connected to the other tubular indwelling device; the connecting portion has an indicator member provided at an end portion into which the other tubular indwelling device is inserted, The indicator member is A tubular indwelling device having a plurality of wires arranged along the circumferential direction of the connection portion, the plurality of wires being configured to form a substantially annular shape as a whole when the tubular indwelling device is placed within the biological lumen.

2. The connection portion is a skeleton portion provided axially apart from the indicator member and expandable and contractible in a radial direction substantially perpendicular to the axial direction; a peripheral surface portion provided along the circumferential direction of the connection portion, The indicator member and the skeleton are connected via the peripheral surface portion. The tubular indwelling device according to claim 1.

3. The connection portion is The device further includes a coating portion provided to cover the skeleton portion, The coating portion includes the peripheral surface portion. The tubular indwelling device according to claim 2.

4. The tubular indwelling device according to any one of claims 1 to 3, wherein the indicator member has a plurality of coil members formed by winding the wire material in a cylindrical shape, and the plurality of coil members are configured to form a substantially annular shape as a whole when the tubular indwelling device is placed in the biological lumen.

5. A cylindrical main body portion; a plurality of cylindrical branch portions extending from one end of the main body portion; At least one of the plurality of branch portions includes the connection portion. The tubular indwelling device according to claim 1.

Images