bracket

Abstract

A stent having a large surface area and excellent shape conformability and diameter reduction properties with respect to a vascular structure. A stent (1) to be inserted into a catheter for expanding a blood vessel by being pushed out of the catheter within the blood vessel, has a first stent body (10) in which a plurality of first units each composed of a strut configured in a frame shape are laid out in the circumferential direction and are continuous in the central axis direction, and a second stent body (20) in which a plurality of second units each composed of a strut configured in a frame shape are laid out in the circumferential direction and are continuous in the central axis direction, the second stent body being inserted into the first stent body, in a state in which the second stent body (20) is inserted into the first stent body (10), a cross portion of the second unit is arranged in a gap portion of the first unit, and the first stent body (10) and the second stent body (20) are not joined to each other in the radial direction.

Description

Technical Field

[0001] This invention relates to scaffolds for expanding the lumens of organisms. Background Technology

[0002] Previously, in cardiovascular, cerebrovascular, and peripheral blood vessels, narrowing or blockage of the lumen due to plaque or other factors was addressed by dilating the ischemic lumen to ensure patency at the lesion site. For example, catheter-based treatments are known that deploy stents or balloons housed within a catheter at the lesion site. As an example of a stent used in such catheter-based treatments, a stent with multiple struts extending radially from a central axis has been proposed (see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: U.S. Patent No. 10390982. Summary of the Invention

[0006] The problem the invention aims to solve

[0007] When using indwelling stents to dilate the lumen of blood vessels, complications such as restenosis, re-occlusion, or thrombosis may occur after stent placement. On the other hand, when using balloon dilation to dilate the lumen of blood vessels, the temporary closure of the vessel can lead to vascular infarction, especially in distal vessels. Furthermore, there are concerns about the limitation of dilation time, residual stenosis after treatment, and restenosis. Moreover, because the dilated vessel becomes linear with a balloon, it may cause vascular damage, perforations in peripheral vessels, and hemorrhagic complications due to rupture or infarction.

[0008] Like the stent in Patent Document 1, a retrieveable stent, by temporarily leaving it in the blood vessel and then retrieving it, can ensure blood flow while reducing the risk of various complications as described above. However, if the surface area of ​​the stent is increased to dilate narrowed blood vessels more evenly, the stent's bending stiffness becomes too high, reducing its shape conformability to the vascular structure. Furthermore, if the surface area of ​​the stent (excluding the void area of ​​the unit) is increased, the stent becomes larger, making it difficult to accommodate the reduced-diameter stent within a narrow-diameter catheter. It can be argued that because the stent in Patent Document 1 has multiple internal struts, shape conformability and diameter reduction significantly decrease when only the surface area is increased.

[0009] The purpose of this invention is to provide a stent with a large surface area and excellent shape conformity and diameter reduction properties to vascular structures.

[0010] Solution for solving the problem

[0011] This invention relates to a stent inserted into a catheter for expanding a blood vessel by being pushed out of the catheter within the vessel. The stent comprises: a first stent body having a plurality of first units, each composed of frame-shaped struts, arranged circumferentially and continuously in a central axis direction; and a second stent body having a plurality of second units, each composed of frame-shaped struts, arranged circumferentially and continuously in a central axis direction. The second stent body is inserted into the first stent body, and in the state of insertion of the second stent body into the first stent body, intersecting portions of the second units are arranged in the gaps between the first units. The first stent body and the second stent body are not radially connected to each other.

[0012] Alternatively, the second support body can be configured such that, with the second support body inserted into the first support body, the second support body pushes the first support body radially outward.

[0013] Alternatively, in a structure where the intersection portion of the second unit is disposed in the gap portion of the first unit, the intersection portion of the second unit is disposed in a gap portion of the first unit.

[0014] With the second support body inserted into the first support body, the proportion of non-gaps in each unit area of ​​the surface of the overlapping part of the first support body and the second support body can also be 5 to 50%.

[0015] Alternatively, the plurality of first units may have a set of first pillars and a first pillar spaced apart from the set of first pillars in a circumferential direction inclined relative to the circumferential direction, and the plurality of second units may have a set of second pillars and a second pillar spaced apart from the set of second pillars in a circumferential direction inclined relative to the circumferential direction.

[0016] Alternatively, the first units may be connected in a first, generally S-shaped intersection in a ring direction inclined relative to the circumference, and the second units may be connected in a second, generally S-shaped intersection in a ring direction inclined relative to the circumference.

[0017] Alternatively, the loop direction in which the plurality of first units are connected at the first intersection is radially symmetrical with the loop direction in which the plurality of second units are connected at the second intersection.

[0018] The proximal ends of the first support body and the proximal ends of the second support body can also be connected at different positions in the axial direction of the push wire.

[0019] A covering film may also be present between the first support body and the second support body.

[0020] Alternatively, a highly photosensitive wire can be spirally wound around at least one of the first support body and the second support body.

[0021] Invention Effects

[0022] According to the present invention, it is possible to provide a stent with a large surface area and excellent shape conformity and diameter reduction of vascular structures. Attached Figure Description

[0023] Figure 1 This is a schematic side view of the bracket 1 according to the first embodiment.

[0024] Figure 2 yes Figure 1 A schematic perspective view of bracket 1 shown.

[0025] Figure 3A It is a virtual unfolded diagram of the first support body 10 as a planar shape.

[0026] Figure 3B It is a virtual unfolded diagram of the second support body 20 as a planar shape.

[0027] Figure 3C This is a virtual unfolded diagram of the support 1 of the first embodiment as a planar shape.

[0028] Figure 4A This is a diagram illustrating the outer diameter D1 of the first support body 10 of the unit.

[0029] Figure 4B This is a diagram illustrating the outer diameter D2 of the second support body 20 of the unit.

[0030] Figure 5 This diagram illustrates the steps of inserting the second support body 20 into the first support body 10.

[0031] Figure 6 yes Figure 1 Sectional view along line s1-s1.

[0032] Figure 7 This diagram illustrates the internal state when the support 1 is bent.

[0033] Figure 8A This is a virtual unfolded view of the first support body 110 of the second embodiment unfolded into a planar shape.

[0034] Figure 8BThis is a virtual unfolded view of the second support body 120 of the second embodiment as a planar shape.

[0035] Figure 8C This is a virtual unfolded view of the support 1A of the second embodiment as a planar shape.

[0036] Figure 9A This is a virtual unfolded view of the first support body 210 of the third embodiment as a planar shape.

[0037] Figure 9B This is a virtual unfolded view of the second support body 220 of the third embodiment as a planar shape.

[0038] Figure 9C This is a virtual unfolded view of the support 1B of the third embodiment as a planar shape.

[0039] Figure 10A This is a cross-sectional view showing the expansion of the stent 1A of the second embodiment within the blood vessel.

[0040] Figure 10B This is a cross-sectional view showing the expansion of the stent 1B of the third embodiment within the blood vessel.

[0041] Figure 11 This is a schematic perspective view of the support 1C according to the fourth embodiment.

[0042] Figure 12A This is a virtual unfolded view of the first support body 310 of the fourth embodiment as a planar shape.

[0043] Figure 12B This is a virtual unfolded view of the second support body 320 of the fourth embodiment as a planar shape.

[0044] Figure 12C This is a virtual unfolded view of the support 1C of the fourth embodiment as a planar shape.

[0045] Figure 13 This is a schematic perspective view of the support 1D according to the fifth embodiment.

[0046] Figure 14A This is a virtual unfolded view of the first support body 410 of the fifth embodiment as a planar shape.

[0047] Figure 14B This is a virtual unfolded view of the second support body 420 of the fifth embodiment as a planar shape.

[0048] Figure 14C This is a virtual unfolded diagram of the support 1D of the fifth embodiment as a planar shape.

[0049] Figure 15 This is a schematic perspective view of the support 1E according to the sixth embodiment.

[0050] Figure 16A This is a virtual unfolded view of the first support body 510 of the sixth embodiment as a planar shape.

[0051] Figure 16B This is a virtual unfolded view of the second support body 520 of the sixth embodiment as a planar shape.

[0052] Figure 16C This is a virtual unfolded diagram of the support 1E of the sixth embodiment as a planar shape.

[0053] Figure 17A This is a side view schematically showing the structure in which the proximal end of the support 1 is connected to the push wire 2 using a first connection method.

[0054] Figure 17B yes Figure 17A Sectional view along line s4-s4.

[0055] Figure 18A This is a side view schematically showing the structure in which the proximal end of the support 1 is connected to the push wire 2 using a second connection method.

[0056] Figure 18B yes Figure 18A Sectional view along line s5-s5.

[0057] Figure 18C yes Figure 18A Sectional view along line s6-s6.

[0058] Figure 19A This is a side view schematically showing the structure in which the proximal end of the support 1 is connected to the push wire 2 using a third connection method.

[0059] Figure 19B yes Figure 19A Sectional view along line s7-s7.

[0060] Figure 19C yes Figure 19A Sectional view along line s8-s8.

[0061] Figure 20 This is a side view schematically showing the structure in which the distal end of the bracket 1 is connected to the distal shaft 3 using a first connection method.

[0062] Figure 21 This is a side view schematically showing another structure that connects the distal end of the bracket 1 to the distal shaft 3 using a first connection method.

[0063] Figure 22This is a side view schematically showing the structure in which the distal end of the bracket 1 is connected to the distal shaft 3 using a fourth connection method.

[0064] Figure 23 This is a schematic side view showing other structures on the distal side of bracket 1.

[0065] Figure 24 This is a schematic side view of the bracket 1F according to the eleventh embodiment.

[0066] Figure 25 yes Figure 24 Sectional view along line s9-s9.

[0067] Figure 26 This is a schematic diagram showing an example of a highly photosensitive wire 31 loosely wound around the support column 11 of the first support body 10.

[0068] Figure 27 This is a schematic diagram showing an example of a highly photosensitive wire 31 being densely wound around the support column 11 of the first support body 10.

[0069] Figure 28 This is a schematic diagram illustrating an example of winding a highly photosensitive wire 31 onto a support 1 using a first method.

[0070] Figure 29 This is a schematic diagram illustrating an example of using a second method to wind a highly radiopaque wire 31 onto a support 1.

[0071] Figure 30 This is a schematic perspective view of the support 1G according to the thirteenth embodiment.

[0072] Figure 31A This is a virtual unfolded view of a portion of the first support body 610 of the thirteenth embodiment as a planar unfolded diagram.

[0073] Figure 31B This is a virtual unfolded view of a portion of the second support body 620 of the thirteenth embodiment as a planar shape.

[0074] Figure 31C This is a virtual unfolded diagram of a portion of the support 1G of the thirteenth embodiment as a planar shape.

[0075] Figure 32A This is a virtual unfolded view of the first support body 310 of the fourteenth embodiment unfolded into a planar shape.

[0076] Figure 32B This is a virtual unfolded view of the second support body 320 of the fourteenth embodiment as a planar shape.

[0077] Figure 32CThis is a virtual unfolded diagram of the support 1H of the fourteenth embodiment as a planar shape.

[0078] Figure 33A This is a virtual unfolded view of the first support body 310 of the fifteenth embodiment unfolded into a planar shape.

[0079] Figure 33B This is a virtual unfolded view of the second support body 320 of the fifteenth embodiment unfolded into a planar shape.

[0080] Figure 33C This is a virtual unfolded diagram of the support 1J of the fifteenth embodiment as a planar shape.

[0081] Figure 34A This is a virtual unfolded view of the first support body 310 of the sixteenth embodiment unfolded into a planar shape.

[0082] Figure 34B This is a virtual unfolded view of the second support body 320 of the sixteenth embodiment as a planar shape.

[0083] Figure 34C This is a virtual unfolded diagram of the support 1K of the sixteenth embodiment as a planar shape. Detailed Implementation

[0084] The following describes embodiments of the bracket of the present invention. Furthermore, the accompanying drawings are schematic diagrams, and the shapes, scales, and aspect ratios of the various parts have been altered or exaggerated relative to the actual object for ease of understanding. Additionally, cross-sectional lines indicating the cross-sections of components have been appropriately omitted in the drawings.

[0085] In this specification, terms relating to shape, geometric conditions, and the degree to which they are defined, such as "orthogonal" and "direction," include, in addition to their strict meaning, a range of degrees considered approximately orthogonal and a range considered approximately in that direction. In this specification, the proximal side of the axial direction (central axis direction) LD, closer to the surgeon, is designated as the LD1 side, and the distal side, farther from the surgeon, is designated as the LD2 side. The direction orthogonal to the axial direction LD is designated as the radial direction RD. Furthermore, in this specification, the direction of the tiling element is designated as the circumferential direction (circumferential OD). In the circumferential direction, in addition to the radial direction RD, a direction inclined relative to the radial direction RD is also included.

[0086] (First Implementation)

[0087] Figure 1 This is a schematic side view of the bracket 1 according to the first embodiment. Figure 2 yes Figure 1 A schematic perspective view of bracket 1 shown. Figure 3A It is a virtual unfolded view of a portion of the first support body 10 of the first embodiment as a planar unfolded view. Figure 3B This is a virtual unfolded view of a portion of the second support body 20 of the first embodiment as a planar unfolded view. Figure 3C It is a virtual unfolded diagram of a portion of the support 1 of the first embodiment as a planar shape. Figure 4A This is a diagram illustrating the outer diameter D1 of the first support body 10 of the unit. Figure 4B This is a diagram illustrating the outer diameter D2 of the second support body 20 of the unit. Figure 5 This diagram illustrates the steps of inserting the second support body 20 into the first support body 10. Figure 6 yes Figure 1 Sectional view along line s1-s1.

[0088] In the accompanying drawings of the first embodiment and other embodiments, to facilitate the distinction between the first support body 10 and the second support body 20, the supports of the first support body 10 are shown in black, and the supports of the second support body 20 are shown in white. Furthermore, in this specification, a "unit" refers to a portion enclosed by filamentous material forming a grid pattern. A "unit" includes not only those with the same shape and size contained in the support body, but also those with different shapes and sizes. A "support" refers to a long, thin strip-shaped portion made of the filamentous material. In this specification, the opening of a unit is also called a "gap portion," and the portion where the supports of adjacent units connect to or overlap each other is also called an "intersection portion." The point where the supports in the intersection portion intersect each other is also called an "intersection point portion." An intersection portion may have a certain extent (area). An intersection portion may contain multiple intersection points.

[0089] The stent 1 of the first embodiment is, for example, housed (inserted) in a catheter (not shown) and used to expand a narrowed or blocked blood vessel by being pushed outward from the catheter within the lumen of the blood vessel.

[0090] like Figure 1 and Figure 2 As shown, the stent 1 is configured to be approximately cylindrical in its expanded state. Although not shown, the stent 1 is elongated cylindrical in its contracted state. Furthermore, a push wire 2 is connected to the proximal end LD1 of the stent 1, and a distal shaft 3 is connected to the distal end LD2. Examples of methods for connecting the proximal end of the stent 1 to the push wire 2 include welding, UV bonding, and silver solder wetting; however, there are no particular limitations as long as the connection method is generally used in medical devices. The connection method between the proximal end of the stent 1 and the push wire 2 will be described later.

[0091] The pusher wire 2 is a component manipulated by the surgical operator when moving the stent 1. The operator pushes or pulls the pusher wire 2 in via an operating part (not shown) connected to the proximal LD1 of the pusher wire 2, thereby enabling the stent 1 to advance or retract within the catheter or blood vessel. By advancing or retracting the pusher wire 2, the operator can temporarily leave the stent 1 at the lesion site or retrieve it. The distal axis 3 is a component used as a marker to confirm the position of the stent 1 distal to X2 in X-ray transmission images; for example, it may be entirely or partially formed of a highly radiopaque material. A highly radiopaque material refers to a material that is non-transmissive or has low radiotransmittance, such as X-rays. Alternatively, the distal axis 3 may be made of, for example, the same material as the pusher wire 2.

[0092] The support 1 has a first support body 10 and a second support body 20. The first support body 10 is a generally cylindrical structure disposed on the outer side of the support 1. The second support body 20 is a generally cylindrical structure disposed on the inner side of the first support body 10. The support 1 is configured as a double-layer structure in which the first support body 10 is inserted and the second support body 20 is inserted. In the state where the first support body 10 is inserted and the second support body 20 is inserted, the first support body 10 and the second support body 20 are not connected to each other in the radial direction. Specifically, the first support body 10 and the second support body 20 are connected by a push wire 2 or by a distal shaft 3, but there is no connection between the push wire 2 and the distal shaft 3. Therefore, the support 1 allows the first support body 10 and the second support body 20 to deform independently on the same layer.

[0093] Furthermore, as described later, the bracket 1 of the first embodiment is manufactured by inserting a second bracket body 20, whose outer diameter is larger than that of the first bracket body 10, into the first bracket body 10 in a reduced-diameter state. Thus, in the bracket 1, the inserted second bracket body 20 is always in a state of pushing the first bracket body 10 outward in the radial direction RD. Therefore, the bracket 1 can maintain the state where the first bracket body 10 and the second bracket body 20 can deform independently on the same layer, while making the first bracket body 10 and the second bracket body 20 fit together more firmly.

[0094] like Figure 1 As shown, on the proximal side LD1 of the support 1, the ends of the first support body 10 and the second support body 20 gradually decrease in diameter as they move toward the push wire 2 and are connected to the push wire 2. Similarly, on the distal side LD2 of the support 1, the ends of the first support body 10 and the second support body 20 gradually decrease in diameter as they move toward the distal shaft 3 and are connected to the distal shaft 3.

[0095] like Figure 3AAs shown, the first support body 10 is covered with a plurality of outer units (first units) 12, each composed of frame-shaped pillars 11, in the radial (circumferential) direction RD. Furthermore, in the first support body 10, the plurality of outer units 12 covering the radial RD are continuously arranged in the axial direction LD. That is, the first support body 10 has a grid pattern in which the plurality of outer units 12, composed of frame-shaped pillars 11, are covered in the radial RD and continuous in the axial direction LD. Gaps 13 are formed in the outer units 12. Additionally, adjacent outer units 12 are connected to each other at intersection points 14.

[0096] like Figure 3B As shown, the second support body 20 is covered with a plurality of inner units (second units) 22, each composed of frame-shaped pillars 21, in the radial (circumferential) direction RD. Furthermore, in the second support body 20, the plurality of inner units 22 covering the radial direction RD are continuously arranged in the axial direction LD. That is, the second support body 20 has a grid pattern in which the plurality of inner units 22, composed of frame-shaped pillars 21, are covered in the radial direction RD and continuous in the axial direction LD. Gaps 23 are formed in the inner units 22. Furthermore, adjacent inner units 22 are connected to each other at intersection points 24.

[0097] As an example, such as Figure 3A and Figure 3B As shown, in the bracket 1 of the first embodiment, the outer unit 12 constituting the first bracket body 10 and the inner unit 22 constituting the second bracket body 20 are configured to have the same size, shape, and arrangement. That is, in the first embodiment, Figure 3A The grid pattern of the first support body 10 shown and Figure 3B The grid pattern of the second support body 20 shown is substantially the same. Alternatively, the grid pattern of the first support body 10 and the grid pattern of the second support body 20 may be different.

[0098] like Figure 3C As shown, in the support 1, the first support body 10 and the second support body 20 overlap in such a way that the intersection portion 24 of the inner unit 22 (second support body 20) is arranged in the gap portion 13 of the outer unit 12 (first support body 10). Specifically, in the structure in which the intersection portion 24 of the inner unit 22 is arranged in the gap portion 13 of the outer unit 12, they overlap in such a way that one intersection portion 24 of the inner unit 22 is arranged in the gap portion 13 of the outer unit 12. By overlapping the grid patterns of each support body as described above, the density of the grid pattern on the support as a whole becomes higher, thus further increasing the surface area of ​​the support 1. In the support 1 of the first embodiment, the proportion of non-gap portion in each unit area of ​​the surface of the overlapping portion of the first support body 10 and the second support body 20 is 5% to 50%.

[0099] On the other hand, such as Figure 4A and Figure 4B As shown, in the first embodiment, the relationship between the outer diameter D1 of the first support body 10 of the monomer and the outer diameter D2 of the second support body 20 of the monomer is set to D1 < D2. Therefore, according to Figure 5 As indicated by the middle arrow, if the second support body 20, whose outer diameter is larger than that of the first support body 10, is reduced in diameter to become a second support body 20A, and then inserted into the first support body 10, a double-layered support structure 1 can be created, in which the second support body 20 is pressed tightly against the inner side of the first support body 10 by its own expansion force. Furthermore, in Figure 5 For ease of understanding, only the ring-shaped unit rows that are fully covered in the circumferential direction are shown in each support body.

[0100] In the bracket 1 manufactured as described above, such as Figure 6 As shown, the first support body 10 and the second support body 20 are brought into a state where they are tightly pressed together in the radial direction RD without any gap due to the expansion force of the second support body 20 itself. Therefore, in the axial direction LD of the support 1 (refer to...), Figure 1 It is less likely that the positions of the first support body 10 and the second support body 20 will be offset relative to each other.

[0101] In the first embodiment, the second support body 20, inserted into the first support body 10 in a reduced-diameter state, is itself a self-expanding body (elastic body). Therefore, the second support body 20 is always in a state of pushing the first support body 10 outwards towards the radial direction RD. Thus, even though the first support body 10 and the second support body 20 are not radially connected, they can be more firmly attached. Furthermore, since the first support body 10 and the second support body 20 are not radially connected, the support 1 can maintain a state where the first support body 10 and the second support body 20 can deform independently on the same layer. Furthermore, the double-layered support 1 has an expansion force obtained by adding the expansion force of the outer first support body 10 and the expansion force of the inner second support body 20. Therefore, even with the same surface area, the expansion force can be greater than that of a single-layered support.

[0102] The materials constituting the scaffold 1 (first scaffold body 10, second scaffold body 20) are preferably materials with high rigidity and high biocompatibility. Examples of such materials include titanium, nickel, stainless steel, platinum, gold, silver, copper, iron, chromium, cobalt, aluminum, molybdenum, manganese, tantalum, tungsten, niobium, magnesium, calcium, or alloys thereof. The scaffold 1 is particularly preferably formed from a material with superelastic properties, such as a nickel-titanium (Ni-Ti) alloy. For example, the grid pattern of the first scaffold body 10 and the second scaffold body 20 can be fabricated by laser processing a generally cylindrical tube made of the aforementioned materials.

[0103] Furthermore, synthetic resins such as polyolefins (PE, PP, etc.), polyamides, polyvinyl chloride, polyphenylene sulfide, polycarbonate, polyether, and polymethyl methacrylate can also be used as materials for scaffold 1. Moreover, biodegradable resins (biodegradable polymers) such as polylactic acid (PLA), polyhydroxybutyrate (PHB), polyglycolic acid (PGA), and polycaprolactone can also be used. Among these, titanium, nickel, stainless steel, platinum, gold, silver, copper, magnesium, or alloys containing them are preferred. Examples of alloys include Ni-Ti alloys, Cu-Mn alloys, Cu-Cd alloys, Co-Cr alloys, Cu-Al-Mn alloys, Au-Cd-Ag alloys, Ti-Al-V alloys, and alloys of magnesium with Zr, Y, Ti, Ta, Nd, Nb, Zn, Ca, Al, Li, Mn, etc. In addition to the above, non-biodegradable resins can also be used as materials for scaffold 1. Thus, scaffold 1 can be formed from any material as long as it is biocompatible.

[0104] Furthermore, the stent 1 may also contain a drug. Here, "stent 1 containing a drug" means that the stent 1 can releasely carry the drug so that the drug can dissolve. The drug is not limited and can include, for example, physiologically active substances. Examples of physiologically active substances include drugs that inhibit intimal thickening, anticancer agents, immunosuppressants, antibiotics, antirheumatic agents, antithrombotic drugs, HMG-CoA reductase inhibitors, ACE inhibitors, calcium channel blockers, antilipidemic agents, anti-inflammatory agents, integrin inhibitors, anti-allergic agents, antioxidants, GPIIbIIIa antagonists, retinoids, flavonoids and carotenoids, lipid modifiers, DNA synthesis inhibitors, tyrosine kinase inhibitors, antiplatelet drugs, vascular smooth muscle proliferation inhibitors, anti-inflammatory drugs, interferon, etc., and a variety of these drugs may also be used.

[0105] In the case where, for example, the first support body 10 and the second support body 20 are made of a superelastic alloy tube, a grid pattern is formed by laser processing on a tube with a diameter of about 2 to 3 mm. Then, by radial expansion processing, the diameter can be expanded to the desired diameter. As described above, a double-layer support 1 can be fabricated by inserting the second support body 20 into the first support body 10. This double-layer support 1... Figure 1 The state shown is such that the diameter is reduced in the radial direction and it is housed within the lumen of the catheter (not shown). If the support 1 housed within the catheter is pushed outward, it returns to its original state. Figure 1 The shape shown is described above. By using an elastic material such as a superelastic alloy or shape memory alloy to form the support 1, the shape recovery function described above can be obtained. In addition, the fabrication of the support 1 is not limited to laser processing; for example, it can also be fabricated by other methods such as machining.

[0106] According to the bracket 1 of the first embodiment described above, the following effects can be obtained, for example.

[0107] The support 1 in the first embodiment is a double-layer structure composed of a first support body 10 and a second support body 20, which overlap in such a way that the intersection portion 24 of the inner unit 22 of the second support body 20 is arranged in the gap portion 13 of the outer unit 12 of the first support body 10 (see reference). Figure 3C By overlapping the grid patterns of each stent body as described above, the density of the grid pattern on the stent as a whole increases, thereby further increasing the surface area of ​​the stent 1. Therefore, the stent 1 according to the first embodiment can more uniformly dilate narrowed blood vessels.

[0108] On the other hand, in the first embodiment, when the second stent body 20 is inserted into the first stent body 10, the first stent body 10 and the second stent body 20 are not radially connected. According to this structure, the first stent body 10 and the second stent body 20 can deform independently on the same layer, and interference that hinders their deformation is less likely to occur, thus further improving the overall flexibility of the stent. In this way, even with an increased surface area, the bending stiffness of the stent 1 in the first embodiment does not become excessively high, thus exhibiting excellent shape conformability to vascular structures.

[0109] Furthermore, as described above, in the stent 1 of the first embodiment, since the first stent body 10 and the second stent body 20 can be deformed independently on the same layer, when the stent 1 is reduced in diameter, the supports of each layer can be reduced in diameter without interfering with each other. In this way, the stent 1 of the first embodiment has excellent diameter reduction capability, and therefore can be easily housed in a small-diameter conduit compared to stents that use a single-layer grid pattern to increase the surface area.

[0110] Therefore, the stent 1 of the first embodiment has a large surface area and excellent shape conformity and diameter reduction of the vascular structure.

[0111] Furthermore, when the support is made into a double-layer structure by weaving filamentous material, the filamentous material is also distributed between the layers, so each woven layer cannot deform independently on the same layer. Therefore, even if the surface area is increased by using a support formed into a double-layer structure by weaving, it is difficult to obtain the shape compliance and diameter reduction properties of the support 1 in the first embodiment.

[0112] Here, the effect of temporarily leaving the stent 1 of the first embodiment in a curved blood vessel will be explained.

[0113] Figure 7 This diagram illustrates the internal state of the bracket 1 when it bends. Figure 7 The diagram schematically illustrates the internal state of a case where stent 1 is temporarily placed within a tortuous blood vessel. Figure 7 In the diagram, arrow A1 drawn on the inner side of support 1 indicates the direction in which the self-expanding force (pressure) of the second support body 20 acts. For example... Figure 7 As shown, in stent 1, the second stent body 20 is always in a state of pushing the first stent body 10 outward due to self-expansion force. Therefore, in blood vessels with small curvatures, it is less likely for a phenomenon known as "kinking" to occur in stent 1. Kinking refers to the stent's cross-section being flattened into an approximately elliptical shape. Furthermore, in curved blood vessels, like... Figure 7 As shown by arrow A2, a force is applied to bend the stent 1. This force is particularly strong on the inner side of the bend, but it acts against the force of arrow A2 by the self-expanding force of the second stent body 20, as shown by arrow A1. Therefore, even if the radius of bend of the stent 1 is small within a curved blood vessel, the stent 1 can be prevented from bending easily.

[0114] The stent 1 of the first embodiment described above is housed within a catheter, and by expanding at the lesion site within the blood vessel lumen, the blood vessel lumen is dilated, thus ensuring patency at the lesion site. Furthermore, the stent 1 does not require prolonged indwelling; it can be retrieved after a predetermined time, preventing adverse complications such as restenosis, re-occlusion, or thrombosis that may occur after stent placement. In addition, the stent 1 of the first embodiment has excellent shape conformability, so it is less likely to straighten the blood vessel as when using a balloon to dilate the blood vessel lumen. Therefore, the stent 1 of the first embodiment is less likely to cause vascular damage, perforations in peripheral vessels, or hemorrhagic complications due to rupture or obstruction. Moreover, the stent 1 of the first embodiment is not limited to narrowing caused by blood vessel lumen; it can also be used for narrowing caused by organs of the digestive system such as the esophagus and large intestine. In other words, the stent 1 of the first embodiment can be used in all biological tissues with tubular structures within the body.

[0115] Furthermore, the stent 1 of the first embodiment can also be used to treat cerebral vasospasm caused by spasm leading to narrowing of cerebral blood vessels. One method for treating cerebral vasospasm is to dilate blood vessels using a balloon. However, balloon dilation can cause vascular occlusion or damage. In contrast, the stent 1 of the first embodiment, due to its excellent shape conformability as described above, is less likely to cause the blood vessel to become straight as it would when dilating the lumen of a blood vessel with a balloon. Therefore, it can be considered that even when the stent 1 of the first embodiment is used to treat cerebral vasospasm, it is less likely to cause vascular damage, perforations of peripheral vessels, or hemorrhagic complications due to rupture or infarction. Additionally, stents of other embodiments described later also achieve the same effects as the stent 1 of the first embodiment.

[0116] (Second Implementation)

[0117] Next, the bracket 1A of the second embodiment will be described. The unit shapes of the first bracket body and the second bracket body of the bracket 1A of the second embodiment are different from those of the first embodiment. In the bracket 1A of the second embodiment, the other structures are the same as those of the first embodiment. Therefore, in the second embodiment, the overall illustration of the bracket 1A is omitted. In addition, in the following description and drawings, parts that perform the same function as in the first embodiment will be appropriately marked with the same reference numerals at the end (last two digits), and repeated descriptions will be appropriately omitted.

[0118] Figure 8A This is a virtual unfolded view of the first support body 110 of the second embodiment unfolded into a planar shape. Figure 3B This is a virtual unfolded view of the second support body 120 of the second embodiment as a planar shape. Figure 8CThis is a virtual unfolded view of the support 1A of the second embodiment as a planar shape. In the second embodiment, the circumferential OD is inclined relative to the radial RD.

[0119] like Figure 8A As shown, in the second embodiment, the first support body 110 is covered with a plurality of outer units (first units) 112 in the circumferential direction OD. In the first support body 110, the plurality of outer units 112 covering the circumferential direction OD are continuously arranged in the axial direction LD. That is, the first support body 110 has a grid pattern in which the plurality of outer units 112 are covered in the circumferential direction OD and are continuous in the axial direction LD.

[0120] The outer unit 112 has two supports 111 disposed on the long side and two supports 111 disposed on the short side. The outer unit 112 is generally parallelogram-shaped when unfolded into a planar state, and the supports 111 on the long side and the supports 111 on the short side are connected to each other at an angle. A gap 113 is formed in the outer unit 112. Furthermore, adjacent outer units 112 are connected to each other at an intersection 114.

[0121] like Figure 8B As shown, in the second embodiment, the second support body 120 is covered with a plurality of inner units (second units) 122 in the circumferential direction OD. In the second support body 120, the plurality of inner units 122 covering the circumferential direction OD are continuously arranged in the axial direction LD. That is, the second support body 120 has a grid pattern in which the plurality of inner units 122 are covered in the circumferential direction OD and are continuous in the axial direction LD.

[0122] The inner unit 122 has two supports 121 disposed on the long side and two supports 121 disposed on the short side. The inner unit 122 is generally parallelogram-shaped when unfolded into a planar state, and the supports 121 on the long side and the supports 121 on the short side are connected to each other at an angle. A gap 123 is formed in each inner unit 122. Furthermore, adjacent inner units 122 are connected to each other at an intersection 124.

[0123] As an example, in the bracket 1A of the second embodiment, the plurality of outer units 112 constituting the first bracket body 110 and the plurality of inner units 122 constituting the second bracket body 120 are configured to have the same size, shape, and arrangement. That is, in the second embodiment, Figure 8A The grid pattern of the first support body 110 shown and Figure 8B The grid pattern of the second support body 120 shown is substantially the same. Alternatively, the grid pattern of the first support body 110 and the grid pattern of the second support body 120 may be different.

[0124] like Figure 8CAs shown, in the bracket 1A of the second embodiment, the first bracket body 110 and the second bracket body 120 overlap in such a way that the intersection portion 124 of the inner unit 122 (second bracket body 120) is disposed in the gap portion 113 of the outer unit 112 (first bracket body 110). Specifically, in the structure in which the intersection portion 124 of the inner unit 122 is disposed in the gap portion 113 of the outer unit 112, they overlap in such a way that one intersection portion 124 of the inner unit 122 is disposed in the gap portion 113 of the outer unit 112. As in the second embodiment, even in the case of... Figure 8A and Figure 8B In the case where the unit shape of each support body is formed in that way, by overlapping the grid pattern of each support body as described above, the density of the grid pattern on the support as a whole becomes higher, thus further increasing the surface area of ​​support 1A.

[0125] (Third Implementation)

[0126] Next, the bracket 1B of the third embodiment will be described. The unit shapes of the first bracket body and the second bracket body of the bracket 1B of the third embodiment are different from those of the first embodiment. In the bracket 1B of the third embodiment, the other structures are the same as those of the first embodiment. Therefore, in the third embodiment, the overall illustration of the bracket 1B is omitted. In addition, in the following description and drawings, parts that perform the same function as in the first embodiment will be appropriately marked with the same reference numerals at the end (last two digits), and repeated descriptions will be appropriately omitted.

[0127] Figure 9A This is a virtual unfolded view of the first support body 210 of the third embodiment as a planar shape. Figure 9B This is a virtual unfolded view of the second support body 220 of the third embodiment as a planar shape. Figure 9C This is a virtual unfolded view of the support 1B of the third embodiment as a planar shape. In the third embodiment, the circumferential directions in which the units are connected to each other at an angle relative to the radial (circumferential) RD are defined as circumferential directions CD1 and CD2 for explanation.

[0128] like Figure 9A As shown, in the third embodiment, the first support body 210 is covered with a plurality of outer units (first units) 212 in the radial (circumferential) direction RD. In the first support body 210, the plurality of outer units 212 covering the radial direction RD are continuously arranged in the axial direction LD. That is, the first support body 210 has a grid pattern in which the plurality of outer units 212 are covered in the radial direction RD and are continuous in the axial direction LD.

[0129] The outer unit 212 has a set of supports (first supports) 211 (hereinafter also referred to as "211a-211b") in the circumferential direction CD1 and supports (first supports) 211 arranged apart from the set of supports 211 by a gap (gap portion 213). Furthermore, the outer unit 212 has two supports 211 arranged in the circumferential direction CD2 by a gap (gap portion 213) facing each other. The ratio of the gap L1 of the set of supports 211a-211b to the gap L2 of the gap portion 213 is, for example, about 1:3 to 1:10. In the outer unit 212, the support 211 arranged separately from the set of supports 211 in the circumferential direction CD1 becomes one of the supports 211 in the set of supports 211 in other adjacent outer units 212 along the circumferential direction CD1.

[0130] A gap portion 213 is formed in the outer unit 212. Furthermore, in each outer unit 212 arranged along the ring direction CD1, a set of pillars 211a-211b and a pillar 211 extending along the ring direction CD1 are connected at the intersection portion 214.

[0131] like Figure 9B As shown, in the third embodiment, the second support body 220 is covered with a plurality of inner units (second units) 222 in the radial (circumferential) direction RD. In the second support body 220, the plurality of inner units 222 covering the radial direction RD are continuously arranged in the axial direction LD. That is, the second support body 220 has a grid pattern in which the plurality of inner units 222 are covered in the radial direction RD and are continuous in the axial direction LD.

[0132] The inner unit 222 has a set of supports (second supports) 221 (hereinafter also referred to as "221a-221b") and a support (second support) 221 arranged apart from the set of supports 221 by a gap (gap portion 223) in the circumferential direction CD1. Furthermore, the inner unit 222 has two supports 221 arranged apart from each other by a gap (gap portion 213) in the circumferential direction CD2. The ratio of the gap L3 of the set of supports 221a-221b to the gap L4 of the gap portion 223a is, for example, about 1:3 to 1:10. In the inner unit 222, the support 221 arranged separately from the set of supports 221 in the circumferential direction CD1 becomes one of the supports 221a in the set of supports 221 in other adjacent inner units 222 along the circumferential direction CD1.

[0133] A gap portion 223 is formed in the inner unit 222. Furthermore, in each inner unit 222 arranged along the ring direction CD1, a set of pillars 221a-221b and a pillar 221 extending along the ring direction CD1 are connected at the intersection portion 224.

[0134] As an example, in the bracket 1B of the third embodiment, the plurality of outer units 212 constituting the first bracket body 210 and the plurality of inner units 222 constituting the second bracket body 220 are configured to have the same size, shape, and arrangement. That is, in the third embodiment, Figure 9A The grid pattern of the first support body 210 shown and Figure 9B The grid pattern of the second support body 220 shown is substantially the same. Alternatively, the grid pattern of the first support body 210 and the grid pattern of the second support body 220 may be different.

[0135] like Figure 9C As shown, in bracket 1B, the first bracket body 210 and the second bracket body 220 overlap in such a way that the intersection portion 224 of the inner unit 222 (second bracket body 220) is disposed in the gap portion 213 of the outer unit 212 (first bracket body 210). Specifically, in the structure in which the intersection portion 224 of the inner unit 222 is disposed in the gap portion 213 of the outer unit 212, they overlap in such a way that one intersection portion 224 of the inner unit 222 is disposed in the gap portion 213 of the outer unit 212. Like the third embodiment, even in the case of... Figure 9A and Figure 9B In the case where the unit shape of each support body is formed in that way, by overlapping the grid pattern of each support body as described above, the density of the grid pattern on the support as a whole becomes higher, thus further increasing the surface area of ​​support 1B.

[0136] Next, other effects of the support 1B in the third embodiment will be explained. Figure 10A This is a cross-sectional view of the stent 1A of the aforementioned second embodiment expanding within a blood vessel. Figure 10A For example, along Figure 8C The s2-s2 line obliquely cuts the virtual cross section of the stent 1A that expands within the blood vessel. Figure 10B This is a cross-sectional view showing the expansion of the stent 1B of the third embodiment within the blood vessel. Figure 10B For example, along Figure 9C The s3-s3 line obliquely cuts the virtual cross section of the stent 1B that expands within the blood vessel.

[0137] like Figure 10A As shown, when the stent 1A of the second embodiment expands inside the blood vessel BV, the struts 111 of the outer unit 112 constituting the first stent body 110 and the struts 121 of the inner unit 122 constituting the second stent body 120 are alternately arranged in the circumferential direction. Therefore, the opening cross-section of the stent 1A has a shape with many convex and concave sections and large steps in the circumferential direction. In addition, in Figure 10A and Figure 10BIn the description, "circumferential" means the circumferential direction when viewing the support from the axial direction (central axis direction).

[0138] On the other hand, such as Figure 10B As shown, when the stent 1B of the third embodiment expands inside the blood vessel BV, it becomes a set of pillars 211 (211a-211b: see reference) constituting the outer unit 212 of the first stent body 210. Figure 9A ) and a set of pillars 221 (221a-221b: refer to) that constitute the inner unit 222 of the second support body 220. Figure 9B The stents are arranged alternately along the circumference. Therefore, the opening cross-section of the stent 1B has a shape with minimal circumferential irregularities and gentle steps. In this way, because the stent 1B of the third embodiment has minimal irregularities in its opening cross-section, it can be expanded in a shape closer to a circle. Therefore, according to the stent 1B of the third embodiment, the inner wall of a narrowed blood vessel BV can be expanded more uniformly.

[0139] (Fourth Implementation)

[0140] Next, the support 1C of the fourth embodiment will be described. The unit shapes of the first support body and the second support body of the support 1C of the fourth embodiment are different from those of the third embodiment. Therefore, in the description and drawings of the fourth embodiment, parts that perform the same function as those in the third embodiment are marked with the same reference numerals at the end (last two digits), and repeated descriptions are appropriately omitted. In the fourth embodiment, the ring directions in which the units are connected to each other at an inclination relative to the radial (circumferential) RD will be defined as ring directions CD1 and CD2 for description.

[0141] Figure 11 This is a schematic perspective view of the support 1C according to the fourth embodiment. Figure 12A This is a virtual unfolded view of the first support body 310 of the fourth embodiment as a planar shape. Figure 12B This is a virtual unfolded view of the second support body 320 of the fourth embodiment as a planar shape. Figure 12C This is a virtual unfolded view of the support 1C of the fourth embodiment as a planar shape.

[0142] like Figure 11 As shown, the support 1C of the fourth embodiment has a first support body 310 and a second support body 320. The first support body 310 is a generally cylindrical structure disposed on the outer side of the support 1C. The second support body 320 is a generally cylindrical structure disposed on the inner side of the first support body 310. The support 1C has a dual structure in which the second support body 320 is inserted into the first support body 310. Furthermore, in Figure 11 In the middle, the following was omitted. Figure 1 The diagram shows the push wire 2 and the distal shaft 3.

[0143] like Figure 12A As shown, the first support body 310 is covered with a plurality of outer units (first units) 312 in the radial (circumferential) direction RD. In the first support body 310, the plurality of outer units 312 covering the radial direction RD are continuously arranged in the axial direction LD. That is, the first support body 310 has a grid pattern in which the plurality of outer units 312 are covered in the radial direction RD and are continuous in the axial direction LD.

[0144] The outer unit 312 has a set of supports (first supports) 311 (hereinafter also referred to as "311a-311b") in the circumferential direction CD1 and a support (first support) 311 arranged apart from the set of supports 311 by a gap (gap portion 313). Furthermore, the outer unit 312 has two supports 311 arranged in the circumferential direction CD2 by a gap (gap portion 313) facing each other. In the outer unit 312, the support 311 arranged separately from the set of supports 311 in the circumferential direction CD1 becomes support 311a, one of the supports 311 in the set of supports 311, in other adjacent outer units 312 along the circumferential direction CD1.

[0145] A gap portion 313 is formed in the outer unit 312. Furthermore, in each outer unit 312 arranged along the circumferential direction CD1, a set of supports 311a-311b and a support 311 extending along the circumferential direction CD1 are connected at a first intersection portion 314 in a generally S-shape. The expanded support 1C is bent into a generally U-shape (see reference). Figure 7 In this case, the first intersecting portion 314 deforms in a manner that extends radially RD. Therefore, the outer element 312, which covers the radially RD, can be bent more flexibly. For example... Figure 12A As shown, in the first support body 310, each of the first intersecting portions 314 is arranged in parallel in the radial direction RD.

[0146] like Figure 12B As shown, the second support body 320 is covered with a plurality of inner units (second units) 322 in the radial (circumferential) direction RD. In the second support body 320, the plurality of inner units 322 covering the radial direction RD are continuously arranged in the axial direction LD. That is, the second support body 320 has a grid pattern in which the plurality of inner units 322 are covered in the radial direction RD and are continuous in the axial direction LD.

[0147] The inner unit 322 has a set of supports (second supports) 321 (hereinafter also referred to as "321a-321b") in the circumferential direction CD1 and a support (second support) 321 arranged apart from the set of supports 321 by a gap (gap portion 323). Furthermore, the inner unit 322 has two supports 321 arranged in the circumferential direction CD2, spaced apart from each other by a gap (gap portion 323). In the inner unit 322, the support 321 arranged separately from the set of supports 321 in the circumferential direction CD1 becomes support 321a, one of the sets of supports 321, in other adjacent inner units 322 along the circumferential direction CD1.

[0148] A gap portion 323 is formed in the inner unit 322. Furthermore, in each inner unit 322 arranged along the circumferential direction CD1, a set of supports 321a-321b and a support 321 extending along the circumferential direction CD1 are connected at a generally S-shaped second intersection portion 324. The expanded diameter support 1C is bent into a generally U-shape (see reference). Figure 7 In the case of [the second intersection portion 324], the second intersection portion 324 deforms in a manner that extends radially RD, thus allowing the inner unit 322, which covers the radially RD, to bend more flexibly. For example... Figure 12B As shown, in the second support body 320, each of the second intersecting portions 324 is arranged in parallel in the radial direction RD.

[0149] As an example, in the bracket 1C of the fourth embodiment, the plurality of outer units 312 constituting the first bracket body 310 and the plurality of inner units 322 constituting the second bracket body 320 are configured to have the same size, shape, and arrangement. That is, in the fourth embodiment, Figure 12A The grid pattern of the first support body 310 shown and Figure 12B The grid pattern of the second support body 320 shown is substantially the same. Alternatively, the grid pattern of the first support body 310 and the grid pattern of the second support body 320 may be different.

[0150] like Figure 12C As shown, in the bracket 1C, the first bracket body 310 and the second bracket body 320 overlap in such a way that the second intersection portion 324 of the inner unit 322 (second bracket body 320) is disposed in the gap portion 313 of the outer unit 312 (first bracket body 310). Specifically, in the structure in which the second intersection portion 324 of the inner unit 322 is disposed in the gap portion 313 of the outer unit 312, they overlap in such a way that one second intersection portion 324 of the inner unit 322 is disposed in the gap portion 313 of the outer unit 312. As in the fourth embodiment, even in the case of... Figure 12A and Figure 12BIn the case where the unit shape of each support body is formed in that way, by overlapping the grid pattern of each support body as described above, the density of the grid pattern on the support as a whole becomes higher, thus further increasing the surface area of ​​support 1C.

[0151] Furthermore, in the bracket 1C of the fourth embodiment, each outer unit 312 of the first bracket body 310 is connected at a generally S-shaped first intersection 314 in the circumferential direction CD1. Similarly, each inner unit 322 of the second bracket body 320 is connected at a generally S-shaped second intersection 324 in the circumferential direction CD2. Moreover, as... Figure 12C As shown, the first intersecting portion 314 of the first support body 310 and the second intersecting portion 324 of the second support body 320 are arranged parallel to each other in the radial direction RD. According to this structure, the expanded support 1C is bent into an approximately U-shape (see reference). Figure 7 In this case, the outer unit 312 and inner unit 322 that are laid out on the radial RD can be bent more flexibly, thus further improving the shape compliance of the support 1C.

[0152] (Fifth Implementation)

[0153] Next, the bracket 1D according to the fifth embodiment will be described. The unit shapes of the first bracket body and the second bracket body of the bracket 1D in the fifth embodiment are different from those in the third embodiment. Therefore, in the description and drawings of the fifth embodiment, parts that perform the same function as in the third embodiment are marked with the same reference numerals at the end (last two digits), and repeated descriptions are appropriately omitted. In the fifth embodiment, the ring directions in which the units are connected to each other at an incline relative to the radial (circumferential) RD will be defined as ring directions CD1 and CD2 for description.

[0154] Figure 13 This is a schematic perspective view of the support 1D according to the fifth embodiment. Figure 14A This is a virtual unfolded view of the first support body 410 of the fifth embodiment as a planar shape. Figure 14B This is a virtual unfolded view of the second support body 420 of the fifth embodiment as a planar shape. Figure 14C This is a virtual unfolded diagram of the support 1D of the fifth embodiment as a planar shape.

[0155] like Figure 13 As shown, the bracket 1D of the fifth embodiment has a first bracket body 410 and a second bracket body 420. The first bracket body 410 is a generally cylindrical structure disposed on the outer side of the bracket 1D. The second bracket body 420 is a generally cylindrical structure disposed on the inner side of the first bracket body 410. The bracket 1D has a dual structure in which the second bracket body 420 is inserted into the first bracket body 410. Furthermore, in Figure 13The middle part is omitted Figure 1 The diagram shows the push wire 2 and the distal shaft 3.

[0156] like Figure 14A As shown, in the fifth embodiment, the first support body 410 is covered with a plurality of outer units (first units) 412 in the radial (circumferential) direction RD. In the first support body 410, the plurality of outer units 412 covering the radial RD are continuously arranged in the axial direction LD. That is, the first support body 410 has a grid pattern in which the plurality of outer units 412 are covered in the radial RD and continuous in the axial direction LD.

[0157] In the fifth embodiment, the structure of the first support body 410 is substantially the same as that of the first support body 310 in the fourth embodiment, therefore detailed description is omitted. In the first support body 410 of the fifth embodiment, the pillars 411, 411a, 411b, the outer unit 412, the gap portion 413, and the first intersection portion 414 correspond to the pillars 311, 311a, 311b, the outer unit 312, the gap portion 313, and the first intersection portion 314 of the first support body 310 in the fourth embodiment. Figure 14A As shown, each of the outer units 312 of the first support body 410 is connected at the first intersection 414 in the circumferential direction CD1.

[0158] like Figure 14B As shown, in the fifth embodiment, the second support body 420 is covered with a plurality of inner units (second units) 422 in the radial (circumferential) direction RD. In the second support body 420, the plurality of inner units 422 covering the radial direction RD are continuously arranged in the axial direction LD. That is, the second support body 420 has a grid pattern in which the plurality of inner units 422 are covered in the radial direction RD and are continuous in the axial direction LD.

[0159] The inner unit 422 has a set of supports (second supports) 421 (hereinafter also referred to as "421a-421b") in the circumferential direction CD2 and a support (second support) 421 arranged apart from the set of supports 421 by a gap (gap portion 423). Furthermore, the inner unit 422 has two supports 421 arranged in the circumferential direction CD2, spaced apart from each other by a gap (gap portion 423). In the inner unit 422, the support 421 arranged separately from the set of supports 421 in the circumferential direction CD2 becomes support 421a, one of the supports 421 in the set of supports 421, in other adjacent inner units 422 along the circumferential direction CD2.

[0160] A gap portion 423 is formed in the inner unit 422. Furthermore, in each inner unit 422 arranged along the circumferential direction CD2, a set of supports 421a-421b and a support 421 extending along the circumferential direction CD1 are connected at a generally S-shaped second intersection portion 424. The expanded diameter support 1D is bent into a generally U-shape (see reference). Figure 7 In the case of ), the second cross portion 424 deforms in a manner that extends in the radial direction RD, thus enabling the inner unit 422, which is covered in the radial direction RD, to bend more flexibly.

[0161] like Figure 14B As shown, the inner units 422 of the second support body 420 are connected at the second intersection 424 in the circumferential direction CD2. Therefore, in the support 1D of the fifth embodiment, the outer units 412 of the first support body 410 are connected at the first intersection 414 (refer to...) Figure 14A The ring direction CD1 and the inner units 422 of the second support body 420 connected in the ring direction CD2 of the second intersection 424 are axially symmetric in the radial direction RD.

[0162] like Figure 14C As shown, in the bracket 1D, the first bracket body 410 and the second bracket body 420 overlap in such a way that the second intersection portion 424 of the inner unit 422 (second bracket body 420) is disposed in the gap portion 413 of the outer unit 412 (first bracket body 410). Specifically, in the structure in which the second intersection portion 424 of the inner unit 422 is disposed in the gap portion 413 of the outer unit 412, they overlap in such a way that one second intersection portion 424 of the inner unit 422 is disposed in one gap portion 413 of the outer unit 412. Furthermore, in the bracket 1D, the first intersection portion 414 of the outer unit 412 and the second intersection portion 424 of the inner unit 422 are arranged parallel to each other in the radial direction RD, and are arranged alternately. Even in the case of... Figure 14A and Figure 14B In the case where the unit shape of each support body is formed in that way, by overlapping the grid pattern of each support body as described above, the density of the grid pattern on the support as a whole becomes higher, thus further increasing the surface area of ​​the support 1D.

[0163] Furthermore, in the bracket 1D of the fifth embodiment, each outer unit 412 of the first bracket body 410 is connected at a first intersection 414 in a generally S-shape in the circumferential direction CD1. On the other hand, each inner unit 422 of the second bracket body 420 is connected at a second intersection 424 in a generally S-shape in the circumferential direction CD2. Moreover, as... Figure 14CAs shown, the first intersecting portion 414 of the first support body 410 and the second intersecting portion 424 of the second support body 420 are arranged parallel to each other in the radial direction RD. According to this structure, the expanded support 1D is bent into an approximately U-shape (see reference). Figure 7 In this case, the outer unit 412 and inner unit 422 that are laid out on the radial RD can be bent more flexibly, thus further improving the shape compliance of the support 1D.

[0164] (Sixth Implementation Method)

[0165] Next, the bracket 1E of the sixth embodiment will be described. The unit shapes of the first bracket body and the second bracket body of the bracket 1E of the sixth embodiment are different from those of the third embodiment. Therefore, in the description and drawings of the sixth embodiment, parts that perform the same function as those in the third embodiment are marked with the same reference numerals at the end (last two digits), and repeated descriptions are appropriately omitted. In the sixth embodiment, the ring directions in which the units are connected to each other at an incline relative to the radial (circumferential) RD will be defined as ring directions CD1 and CD2 for description.

[0166] Figure 15 This is a schematic perspective view of the support 1E according to the sixth embodiment. Figure 16A This is a virtual unfolded view of the first support body 510 of the sixth embodiment as a planar shape. Figure 16B This is a virtual unfolded view of the second support body 520 of the sixth embodiment as a planar shape. Figure 16C This is a virtual unfolded view of the support 1E of the sixth embodiment as a planar shape. In the sixth embodiment, the circumferential OD is inclined relative to the radial RD.

[0167] like Figure 15 As shown, the bracket 1E of the sixth embodiment has a first bracket body 510 and a second bracket body 520. The first bracket body 510 is a generally cylindrical structure disposed on the outer side of the bracket 1E. The second bracket body 520 is a generally cylindrical structure disposed on the inner side of the first bracket body 510. The bracket 1E of the sixth embodiment has a dual structure in which the second bracket body 520 is inserted into the first bracket body 510. Furthermore, in Figure 15 The middle part is omitted Figure 1 The diagram shows the push wire 2 and the distal shaft 3.

[0168] like Figure 16AAs shown, the first support body 510 is covered with a plurality of outer units (first units) 512 in the circumferential direction OD. In the first support body 510, the plurality of outer units 512 covering the circumferential direction OD are continuously arranged in the axial direction LD. That is, the first support body 510 has a grid pattern in which the plurality of outer units 512 are covered in the circumferential direction OD and are continuous in the axial direction LD.

[0169] The outer unit 512 has a set of supports (first supports) 511 (hereinafter also referred to as "511a-511b") and a support (first support) 511 arranged apart from the set of supports 511 by a gap (gap portion 513) in the circumferential direction CD1. Furthermore, the outer unit 512 has two supports 511 arranged apart from each other by a gap (gap portion 513) in the circumferential direction CD2. In the outer unit 512, the support 511 arranged separately from the set of supports 511 in the circumferential direction CD1 becomes support 511a, one of the supports 511 in the set of supports 511, in other adjacent outer units 512 along the circumferential direction CD1.

[0170] A set of supports 511a-511b and one support 511 arranged in the circumferential direction CD1 constitute the long side of the outer unit 512. Additionally, two supports 511 arranged in the circumferential direction CD2 constitute the short side of the outer unit 512. The outer unit 512, when unfolded into a planar shape, is approximately a parallelogram, with the supports 511a-511b and 511 on the long side and the support 511 on the short side connected to each other at an incline.

[0171] A gap portion 513 is formed in the outer unit 512. Furthermore, in each outer unit 512 arranged along the circumferential direction CD1, a set of supports 511a-511b and a support 511 extending along the circumferential direction CD1 are connected at a first intersection portion 514 in a generally S-shape. The expanded diameter support 1E is bent into a generally U-shape (see reference). Figure 7 In this case, the first intersecting portion 514 deforms in a manner that extends radially RD. Therefore, the outer element 512, which covers the radially RD, can be bent more flexibly. Figure 16A As shown, in the first support body 510, each of the first intersecting portions 514 is arranged in parallel on the circumferential OD.

[0172] like Figure 16B As shown, the second support body 520 is covered with a plurality of inner units (second units) 522 in the circumferential direction OD. In the second support body 520, the plurality of inner units 522 covering the circumferential direction OD are continuously arranged in the axial direction LD. That is, the second support body 520 has a grid pattern in which the plurality of inner units 522 are covered in the circumferential direction OD and are continuous in the axial direction LD.

[0173] The inner unit 522 has a set of supports (second supports) 521 (hereinafter also referred to as "521a-521b") in the circumferential direction CD1 and a support (second support) 521 arranged apart from the set of supports 521 by a gap (gap portion 523). Furthermore, the inner unit 522 has two supports 521 arranged in the circumferential direction CD2, spaced apart from each other by a gap (gap portion 523). In the inner unit 522, the support 521 arranged separately from the set of supports 521 in the circumferential direction CD1 becomes support 521a, one of the sets of supports 521, in other adjacent inner units 522 along the circumferential direction CD1.

[0174] A set of supports 521a-521b and one support 521 arranged in the circumferential direction CD1 constitute the long side of the inner unit 522. Additionally, two supports 521 arranged in the circumferential direction CD2 constitute the short side of the inner unit 522. The inner unit 522, when unfolded into a planar shape, is approximately a parallelogram, with the supports 521a-521b and 521 on the long side and the support 521 on the short side connected at an angle to each other.

[0175] A gap portion 523 is formed in the inner unit 522. Furthermore, in each inner unit 522 arranged along the circumferential direction CD1, a set of supports 521a-521b and a support 521 extending along the circumferential direction CD1 are connected at a generally S-shaped second intersection portion 524. The expanded diameter support 1E is bent into a generally U-shape (see reference). Figure 7 In this case, the second intersection portion 524 deforms in a manner that extends radially RD. Therefore, the inner unit 522, which covers the radially RD, can be bent more flexibly. Figure 16B As shown, in the second support body 520, each of the second intersecting portions 524 is arranged in parallel on the circumferential OD.

[0176] like Figure 16C As shown, in bracket 1E, the first bracket body 510 and the second bracket body 520 overlap in such a way that the second intersection portion 524 of the inner unit 522 (second bracket body 520) is disposed in the gap portion 513 of the outer unit 512 (first bracket body 510). Specifically, in the structure in which the second intersection portion 524 of the inner unit 522 is disposed in the gap portion 513 of the outer unit 512, they overlap in such a way that one second intersection portion 524 of the inner unit 522 is disposed in one gap portion 513 of the outer unit 512. Furthermore, in bracket 1E, the first intersection portion 514 of the outer unit 512 and the second intersection portion 524 of the inner unit 522 are arranged parallel to each other in the circumferential OD direction, and are arranged alternately. Even in the case of... Figure 16A and Figure 16BIn the case where the unit shape of each support body is formed in that way, by overlapping the grid pattern of each support body as described above, the density of the grid pattern on the support as a whole becomes higher, thus further increasing the surface area of ​​the support 1E.

[0177] Furthermore, in the bracket 1E of the sixth embodiment, each outer unit 512 of the first bracket body 510 is connected at a generally S-shaped first intersection 514 in the circumferential direction CD1. Similarly, each inner unit 522 of the second bracket body 520 is connected at a generally S-shaped second intersection 524 in the circumferential direction CD1. Moreover, as... Figure 16C As shown, the first intersecting portion 514 of the first support body 510 and the second intersecting portion 524 of the second support body 520 are arranged parallel to each other in the circumferential OD direction. According to this structure, the expanded support 1E is bent into an approximately U-shape (see reference). Figure 7 In this case, the outer unit 512 and inner unit 522 that are covered on the circumferential OD can be bent more flexibly, thus further improving the shape compliance of the support 1E.

[0178] (Seventh Implementation)

[0179] Figure 17A This is a side view schematically showing the structure in which the proximal end of the support 1 and the push wire 2 are connected using a first connection method. Figure 17B yes Figure 17A A cross-sectional view along line s4-s4. Furthermore, in the descriptions of the seventh embodiment and the eighth and ninth embodiments described later, the support 1 of the first embodiment (see reference) is cited. Figure 1 The example shown is used to illustrate the connection method of the bracket, but it can also be applied to brackets in other embodiments. In addition, the structure of bracket 1 is simplified in the figures described below.

[0180] like Figure 17A As shown, the proximal end 101 of the first support body 10 (LD1) is connected to the push wire 2 at the connecting portion 102. The proximal end 201 of the second support body 20 (LD1) is connected to the push wire 2 at the connecting portion 202. In the first connection method, the connecting portion 102 of the first support body 10 and the connecting portion 202 of the second support body 20 are formed at the same position along the axial direction LD of the push wire 2. The connecting portion 102 of the first support body 10 and the connecting portion 202 of the second support body 20 are schematically shown at the position and range of the connection by welding or the like.

[0181] like Figure 17B As shown, the connecting portion 102 of the first support body 10 and the connecting portion 202 of the second support body 20 are formed at equal intervals in the radial direction (orthogonal to the axial direction LD) of the push wire 2. Furthermore, in Figure 17BThe example shown is an example in which the connecting portion 102 of the first support body 10 and the connecting portion 202 of the second support body 20 are provided at 90-degree intervals in the circumferential direction, but it is not limited to this.

[0182] (Eighth Implementation Method)

[0183] Figure 18A This is a side view schematically showing the structure in which the proximal end of the support 1 and the push wire 2 are connected using a second connection method. Figure 18B yes Figure 18A Sectional view along line s5-s5. Figure 18C yes Figure 18A A sectional view along line S6-S6. In Figure 18B and Figure 18C In order to facilitate understanding of the position of each connection part, the vertical direction in the figure is designated as the first radial direction RD1, and the horizontal direction in the figure, which is orthogonal to the first radial direction RD1, is designated as the second radial direction RD2. In addition, the orientation of the first radial direction RD1 and the second radial direction RD2 is not limited to the vertical direction and the horizontal direction in the figure.

[0184] like Figure 18A As shown, the proximal LD1 end 101 of the first support body 10 and the proximal LD1 end 201 of the second support body 20 are connected at different positions along the axial direction LD of the push wire 2. Specifically, the end 101 of the first support body 10 extends from the distal LD2 to the proximal LD1 along the side of the push wire 2. Moreover, the end 101 of the first support body 10 is connected at the connection portion 102, which is closer to the LD1 than the connection portion 202 of the second support body 20. On the other hand, the end 201 of the second support body 20 is located on the distal LD2 of the push wire 2. Moreover, the end 201 of the second support body 20 is connected at the connection portion 202, which is further distal to the LD2 than the end 101 of the first support body 10.

[0185] When viewed from the axial direction LD of the push wire 2, the connecting portions 102 of the first support body 10 and the connecting portions 202 of the second support body 20 are formed at equal intervals. For example, as Figure 18B As shown, connecting portions 202 of the second support body 20 are formed at 180-degree intervals on the first radial direction RD1. Figure 18B In the middle, the end 101 of the first support body 10 contacts the side of the push wire 2, but is not connected at the connecting part 102. Furthermore, as... Figure 18C As shown, the connecting portion 102 of the first support body 10 is formed at 180-degree intervals on the second radial direction RD2.

[0186] According to the structure of this embodiment, the ends 101 of the first support body 10 and the second support body 20 are not connected at the same position in the axial direction LD of the push wire 2. Therefore, it is possible to suppress adverse conditions such as deformation of the push wire 2 caused by heat during welding. Alternatively, the positions of the connecting portion 102 of the first support body 10 and the connecting portion 202 of the second support body 20 can be interchanged in the axial direction LD of the push wire 2, and the connecting portion 102 of the first support body 10 can be placed further away from the connecting portion 202 of the second support body 20 by a distance LD2.

[0187] (Ninth Implementation)

[0188] Figure 19A This is a side view schematically showing the structure in which the proximal end of the support 1 and the push wire 2 are connected using a third connection method. Figure 19B yes Figure 19A Sectional view along line s7-s7. Figure 19C yes Figure 19A A sectional view along line S8-S8. In Figure 19B and Figure 19C In order to make it easier to understand the position of each connecting part, in the same way as the eighth embodiment, the up and down direction in the figure is set as the first radial direction RD1, and the left and right direction in the figure, which is orthogonal to the first radial direction RD1, is set as the second radial direction RD2.

[0189] like Figure 19A As shown, the end 101 of the first support body 10 and the end 201 of the second support body 20 are connected at different positions along the axial direction LD of the push wire 2. Specifically, the end 101 of the first support body 10 extends from the distal LD2 to the proximal LD1, passing over the end 201 of the second support body 20. Furthermore, the end 101 of the first support body 10 is connected at the connecting portion 102 closer to the LD1 than the end 201 of the second support body 20. On the other hand, the end 201 of the second support body 20 is located on the distal LD2 of the push wire 2. Moreover, the end 201 of the second support body 20 is connected at the connecting portion 202 further distal to the LD2 than the end 101 of the first support body 10.

[0190] When viewed from the axial direction LD of the push wire 2, the connecting portions 102 of the first support body 10 and the connecting portions 202 of the second support body 20 are formed at equal intervals. For example, as Figure 19B As shown, a connecting portion 202 of the second support body 20 is formed at 180-degree intervals on the first radial direction RD1. Furthermore, as... Figure 19C As shown, similar to the connecting portion 202 of the second support body 20, the connecting portion 102 of the first support body 10 is formed at 180-degree intervals on the first radial direction RD1.

[0191] Alternatively, along the axial direction LD of the push wire 2, the positions of the connecting portion 102 of the first support body 10 and the connecting portion 202 of the second support body 20 can be interchanged, with the connecting portion 102 of the first support body 10 positioned further away from the connecting portion 202 of the second support body 20 by LD2. Furthermore, in Figure 19B In addition, a connecting portion 202 of the second support body 20 may be formed at 180-degree intervals on the second radial RD2, and a connecting portion 102 of the first support body 10 may be formed at 180-degree intervals on the second radial RD2.

[0192] (Tenth Implementation)

[0193] The connection method between the proximal end of the support 1 and the push wire 2 shown in the seventh to tenth embodiments described above can also be applied to the connection method between the distal LD2 and the distal shaft 3 of the support 1. Figure 20 This is a side view schematically showing the structure in which the distal end of the bracket 1 and the distal shaft 3 are connected using the first connection method (seventh embodiment).

[0194] like Figure 20 As shown, the distal end 103 of the first support body 10 (LD2) is connected to the distal shaft 3 at the connecting portion 104. The distal end 203 of the second support body 20 (LD2) is connected to the distal shaft 3 at the connecting portion 204. The connecting portion 104 of the first support body 10 and the connecting portion 204 of the second support body 20 are formed at the same position in the axial direction LD of the distal shaft 3. Furthermore, although not shown, when viewed from the axial direction LD of the distal shaft 3, the connecting portions 104 of the first support body 10 and the connecting portions 204 of the second support body 20 are formed at equal intervals (for example, see reference LD). Figure 17B ).

[0195] Figure 21 This schematically illustrates the use of the first connection method (see reference). Figure 20 A side view of other structures connecting the distal end of bracket 1 and distal shaft 3. (e.g.) Figure 21 As shown, a structure in which a highly angiographic metal wire 30 is inserted into the interior of the stent 1 can also be used. The distal end LD2 of the metal wire 30 is connected to the distal shaft 3. Furthermore, although not shown, the proximal end LD1 of the metal wire 30 is connected to the push wire 2 (see reference). Figure 1 )connect.

[0196] Figure 22 This is a side view schematically illustrating the structure that connects the distal end of the bracket 1 and the distal shaft 3 using a fourth connection method. (See attached image.) Figure 22As shown, the distal end 203 of the second support body 20's LD2 is connected to the distal shaft 3 at the connecting portion 204. On the other hand, the distal end 203 of the first support body 10's LD2 is not connected to the distal shaft 3. That is, in the fourth connection method, on the distal side of the support 1, only the distal end 203 of the second support body 20's LD2 is connected to the distal shaft 3. Furthermore, in Figure 20 In the fourth connection method shown, a structure can also be adopted in which the far side of the bracket 1 is connected to the far end shaft 3 by only the end 103 of the far side LD2 of the first bracket body 10.

[0197] Figure 23 This is a schematic side view showing other structures on the distal side of bracket 1. (See attached image.) Figure 23 As shown, a structure can also be adopted in which the distal LD2 of the first support body 10 and the distal LD2 of the second support body 20 are respectively opened. Additionally, although not shown in the figure, in... Figure 23 In the structure shown, the proximal end of the first support body 10 and the proximal end of the second support body 20 are respectively connected to the push wire 2 (refer to...). Figure 1 )connect.

[0198] (Eleventh Implementation Method)

[0199] Figure 24 This is a schematic side view of the bracket 1F according to the eleventh embodiment. Figure 25 yes Figure 24 A sectional view along line s9-s9. In the description and drawings of the eleventh embodiment, components and the like that in the first embodiment are labeled with the same reference numerals as in the first embodiment, and repeated descriptions are omitted.

[0200] like Figure 24 and Figure 25 As shown, the eleventh embodiment of the support 1F has a cover film 40 between the first support body 10 and the second support body 20. The cover film 40 is formed in a generally cylindrical shape and extends along the axial direction LD of the support 1F. As the cover film 40, materials such as PTFE and ePTFE can be used, for example. The thickness of the cover film 40 is, for example, about 0.05 to 0.2 mm.

[0201] By providing a covering membrane 40 between the first stent body 10 and the second stent body 20, plaques, thrombi, etc., can be inhibited from entering the support (see reference). Figures 3A-3C The gap can leak out and cause vascular infarction in the distal blood vessel. The covering membrane 40 is not limited to the space between the first stent body 10 and the second stent body 20, but can also be placed on the outside of the first stent body 10.

[0202] The covering membrane 40 may contain a pharmaceutical agent. "Containing a pharmaceutical agent" means that the covering membrane 40 is capable of releasing the pharmaceutical agent so that the agent can dissolve. The pharmaceutical agent is not limited; for example, the pharmaceutical agent exemplified in the structure of the stent 1 in the first embodiment that contains a pharmaceutical agent can be used. Furthermore, the covering membrane 40 may also be made of an antithrombotic material having blood coagulation inhibition properties.

[0203] (Twelfth Implementation)

[0204] Next, an embodiment for winding high-contrast wires using a support will be described. In this embodiment, the support 1 of the first embodiment (refer to...) is used as the support for winding high-contrast wires. Figure 1 This example is used for illustration, but it can also be applied to brackets in other implementations.

[0205] Figure 26 This is a schematic diagram showing an example of a highly photosensitive wire 31 (hereinafter also referred to as "wire 31") being sparsely wound around the support 11 of the first support body 10. Figure 26 In the example shown, the wire 31 can be wound around all the supports 11 of the first support body 10, or it can be wound around only a portion of the supports 11.

[0206] Figure 27 This is a schematic diagram showing an example of a highly photosensitive wire 31 densely (in a coil shape) wound around the support 11 of the first support body 10. Figure 27 In the example shown, the wire 31 can be wound around all the supports 11 of the first support body 10, or it can be wound around only a portion of the supports 11.

[0207] In addition, Figure 26 and Figure 27 In the example shown, the wire 31 can also be wound around the support post 21 of the second support body 20 in the same manner. Furthermore, the wire 31 can be wound around both the first support body 10 and the second support body 20, or it can be wound around either side.

[0208] Figure 28 This is a schematic diagram illustrating an example of winding a highly photosensitive wire 31 onto a support 1 using a first method. For example... Figure 28As shown, in the first embodiment, the wire 31 is spirally wound around the second stent body 20 located inside the stent 1. One end 31a of the wire 31 is connected to the proximal LD1 of the second stent body 20. Furthermore, the other end 31b of the wire 31 is connected to the distal LD2 of the second stent body 20. By spirally winding the wire 31 around the second stent body 20, the visibility of the expanded stent 1 within the blood vessel can be improved in X-ray transmission images. Alternatively, multiple wires 31 can be wound. With multiple wires 31 wound, areas where the expanded stent 1 has not fully expanded within the blood vessel can be identified.

[0209] The wire 31 can also be connected to the support column 21 of the second support body 20 by welding or other means (see reference). Figure 3B Furthermore, the wire 31 is not limited to the second support body 20; it can be connected to the first support body 10 located outside the support 1, or it can be connected to different support bodies. For example, it can also be a structure in which one end of the wire 31 is connected to the proximal LD1 of the second support body 20, while the other end is connected to the distal LD2 of the first support body 10.

[0210] Figure 29 This is a schematic diagram illustrating an example of using a second method to wind a highly radiopaque wire 31 onto a support 1. For example... Figure 29 As shown, in the second configuration, the wire 31 is spirally wound back and forth between both ends of the second support body 20. One end of the wire 31 is connected to the proximal side LD1 of the second support body 20. The wire 31 is spirally wound from the proximal side LD1 of the support body 20 toward the distal side LD2. The wire 31 is folded back at the distal end LD2 of the second support body 20 and spirally wound from the distal side LD2 of the support body 20 toward the proximal side LD1. The other end of the wire 31 is connected to the proximal side LD1 of the second support body 20. Figure 29 The second method shown can also achieve the same effect as the first method described above.

[0211] In this configuration, the wire 31 can also be connected to the support column 21 of the second support body 20 by welding or the like. Furthermore, the wire 31 is not limited to the second support body 20; it can be connected to the first support body 10 located outside the support 1, or it can be connected to different support bodies. For example, it could be a structure where one end of the wire 31 is connected to the proximal LD1 of the second support body 20, and the other end is connected to the distal LD2 of the first support body 10.

[0212] (Thirteenth Implementation Method)

[0213] Next, the support 1G according to the thirteenth embodiment will be described. The unit shapes of the first support body and the second support body of the support 1G according to the thirteenth embodiment are different from those of the first embodiment. In the support 1G according to the thirteenth embodiment, the other structures are the same as those of the first embodiment. In the following description and drawings, parts that perform the same function as those in the first embodiment will be appropriately marked with the same reference numerals at the end (last two digits), and repeated descriptions will be omitted as appropriate.

[0214] Figure 30 This is a schematic perspective view of the support 1G according to the thirteenth embodiment. Figure 31A This is a virtual unfolded view of a portion of the first support body 610 of the thirteenth embodiment as a planar unfolded diagram. Figure 31B This is a virtual unfolded view of a portion of the second support body 620 of the thirteenth embodiment as a planar shape. Figure 31C This is a virtual unfolded diagram of a portion of the support 1G of the thirteenth embodiment as a planar shape.

[0215] like Figure 30 As shown, the bracket 1G of the thirteenth embodiment has a first bracket body 610 and a second bracket body 620. The first bracket body 610 is a generally cylindrical structure disposed on the outer side of the bracket 1G. The second bracket body 620 is a generally cylindrical structure disposed on the inner side of the first bracket body 610. The bracket 1G has a dual structure in which the second bracket body 620 is inserted into the first bracket body 610. Furthermore, in Figure 30 The middle part is omitted Figure 1 The diagram shows the push wire 2 and the distal shaft 3.

[0216] like Figure 31A As shown, the first support body 610 is covered with a plurality of outer units (first units) 612, each composed of frame-shaped pillars 611, along its radial (circumferential) RD direction. In the first support body 610, the plurality of outer units 612 covering the radial RD direction are continuously arranged along the axial direction LD. That is, the first support body 610 has a grid pattern in which the plurality of outer units 612 are covered radially RD and continuous along the axial direction LD. Gaps 613 are formed in the outer units 612. Furthermore, adjacent outer units 612 in the radial RD direction are connected to each other at intersections 614.

[0217] The intersection portion 614 is the portion that connects the supports 611 of the four adjacent outer units 612. The intersection portion 614 has a generally rectangular shape that is elongated in the axial direction LD. Each support 611 is connected to one of the four corners of the intersection portion 614. Each support 611 has a curved portion 615 formed at the portion where it connects to the intersection portion 614. Therefore, compared with the intersection portion 14 (outer unit 12) of the first embodiment, in the intersection portion 614 (outer unit 612) of this embodiment, the support 611 has a shape that extends along the axial direction LD. Therefore, when the expanded diameter support 1G is bent into a generally U-shape (see reference...), Figure 7 In this case, each support 611 connected to the intersection 614 can be deformed independently. Therefore, the outer unit 612 covering the radial RD can be bent more flexibly. In this way, the first support body 610 can make the outer unit 612 covering the radial RD bend more flexibly, thus exhibiting excellent shape conformability and diameter reduction.

[0218] like Figure 31B As shown, the second support body 620 is covered radially (circumferentially) with a plurality of inner units (second units) 622, each composed of frame-shaped pillars 621. In the second support body 620, the plurality of inner units 622 covering the radially RD are continuously arranged in the axial direction LD. That is, the second support body 620 has a grid pattern in which the plurality of inner units 622 are covered radially RD and continuous in the axial direction LD. Gaps 623 are formed in the inner units 622. Furthermore, adjacent inner units 622 in the radially RD are connected to each other at intersections 624.

[0219] The intersection portion 624 connects the supports 621 of the four adjacent inner units 622. The intersection portion 624 has a generally rectangular shape that is elongated in the axial direction LD. Each support 621 is connected to one of the four corners of the intersection portion 624. Each support 621 has a curved portion 625 formed at the part where it connects to the intersection portion 624. Therefore, compared with the intersection portion 24 (inner unit 22) of the first embodiment, in the intersection portion 624 (inner unit 622) of this embodiment, the support 621 has a shape that extends along the axial direction LD. Therefore, when the expanded support 1G is bent into a generally U-shape, each support 621 connected to the intersection portion 624 can be deformed independently in the radial direction RD. Therefore, the inner units 622 that cover the radial direction RD can be bent more flexibly. In this way, the second support body 620 can be bent more flexibly in the inner units 622 that cover the radial direction RD, thus exhibiting excellent shape conformability and diameter reduction.

[0220] As an example, such as Figure 31A and Figure 31BAs shown, in the bracket 1G of the thirteenth embodiment, the outer unit 612 constituting the first bracket body 610 and the inner unit 622 constituting the second bracket body 620 are configured to have the same size, shape, and arrangement. That is, in the thirteenth embodiment, Figure 31A The grid pattern of the first support body 610 shown and Figure 31B The grid pattern of the second support body 620 shown is substantially the same. Alternatively, the grid pattern of the first support body 610 and the grid pattern of the second support body 620 may be different.

[0221] like Figure 31C As shown, in the support 1G, the first support body 610 and the second support body 620 overlap in such a way that the intersection portion 624 of the inner unit 622 (second support body 620) is arranged in the gap portion 613 of the outer unit 612 (first support body 610). Specifically, in the structure in which the intersection portion 624 of the inner unit 622 is arranged in the gap portion 613 of the outer unit 612, they overlap in such a way that one intersection portion 624 of the inner unit 622 is arranged in the gap portion 613 of the outer unit 612. By overlapping the grid patterns of each support body as described above, the density of the grid pattern on the support as a whole becomes higher, thus further increasing the surface area of ​​the support 1G. Furthermore, in the support 1G of this embodiment, since the intersection portion 614 of the outer unit 612 has a grid pattern similar to the grid pattern of the second support body, the grid pattern is more densely packed with the grid pattern of the second support body. Figure 31A As shown in the structure, the intersection 624 of the inner unit 622 has a structure like... Figure 31B As shown, the structure provides excellent shape compliance and diameter reduction. Furthermore, since the outer unit 612 and the inner unit 622 have the structure described above, it is possible to easily accommodate the reduced-diameter stent 1G into the catheter, and also to easily accommodate the expanded-diameter stent 1G into the catheter.

[0222] (Fourteenth Implementation)

[0223] Next, the support 1H of the fourteenth embodiment will be described. The unit shapes of the first support body and the second support body of the support 1H of the fourteenth embodiment are the same as those of the fourth embodiment (see reference). Figure 12A , Figure 12B The structure of the bracket 1H in the fourteenth embodiment is the same as that in the fourth embodiment. Therefore, an overall illustration of the bracket 1H is omitted in the fourteenth embodiment. In the description and drawings of the fourteenth embodiment, parts that perform the same functions as in the fourth embodiment are labeled with the same reference numerals, and repeated descriptions are omitted as appropriate. In the fourteenth embodiment, the ring directions in which the units are connected to each other at an angle relative to the radial (circumferential) RD are defined as ring directions CD1 and CD2 for description.

[0224] Figure 32A This is a virtual unfolded view of the first support body 310 of the fourteenth embodiment unfolded into a planar shape. Figure 32B This is a virtual unfolded view of the second support body 320 of the fourteenth embodiment as a planar shape. Figure 32C This is a virtual unfolded diagram of the support 1H of the fourteenth embodiment as a planar shape.

[0225] The configuration of the first intersecting portion 314 of the first support body 310 in the fourteenth embodiment differs from that in the fourth embodiment. For example... Figure 32A As shown, the first support body 310 of the fourteenth embodiment has columns C1 arranged with first cross portions 314 every other unit and columns C2 arranged with first cross portions 314 between each unit in the circumferential direction CD1. Furthermore, columns C1 and C2 are arranged alternately in the circumferential direction CD2. In the first support body 310 of the fourteenth embodiment, the other structures are the same as in the fourth embodiment.

[0226] The configuration of the second intersecting portion 324 of the second support body 320 in the fourteenth embodiment differs from that in the fourth embodiment. For example... Figure 32B As shown, the second support body 320 of the fourteenth embodiment has columns C3 in the circumferential direction CD1, each column having a second cross portion 324 arranged at every other interval, and columns C4 in the circumferential direction CD2, each column having a second cross portion 324 arranged between units. Furthermore, columns C3 and C4 are arranged alternately in the circumferential direction CD2. In the second support body 320 of the fourteenth embodiment, the other structures are the same as in the fourth embodiment.

[0227] As an example, in the support 1H of the fourteenth embodiment, the plurality of outer units 312 constituting the first support body 310 and the plurality of inner units 322 constituting the second support body 320 are configured to have the same size, shape, and arrangement. That is, in the fourteenth embodiment, Figure 32A The grid pattern of the first support body 310 shown and Figure 32B The grid pattern of the second support body 320 shown is substantially the same. Alternatively, the grid pattern of the first support body 310 and the grid pattern of the second support body 320 may be different.

[0228] like Figure 32CAs shown, in the bracket 1H of the fourteenth embodiment, in column C5, along the circumferential direction CD1, units with second intersecting portions 324 of the second bracket body 320 and units with portions lacking second intersecting portions 324 are alternately arranged in the gap portion 313 of the first bracket body 310. Furthermore, in column C6, along the circumferential direction CD1, the second intersecting portions 324 of the second bracket body 320 are arranged in the gap portion 313 of the first bracket body 310. Moreover, in the bracket 1H of the fourteenth embodiment, along the circumferential direction CD2, the first bracket body 310 and the second bracket body 320 overlap by alternately arranging columns C5 and C6.

[0229] Like the fourteenth embodiment, even in the case of Figure 32A and Figure 32B With the unit shapes constituting each support body in that manner, by overlapping the grid patterns of each support body as described above, the density of the grid pattern on the support as a whole increases, thus further increasing the surface area of ​​the support 1H. Furthermore, in the support 1H of the fourteenth embodiment, similar to the support 1C of the fourth embodiment, the expanded diameter support 1H is bent into a roughly U-shape (see reference). Figure 7 In this case, the outer unit 312 and inner unit 322 that are laid out on the radial RD can be bent more flexibly, thus further improving the shape compliance of the support 1H.

[0230] (Fifteenth Implementation)

[0231] Next, the bracket 1J of the fifteenth embodiment will be described. The unit shapes of the first bracket body and the second bracket body of the bracket 1J of the fifteenth embodiment are the same as those of the fourth embodiment (see reference). Figure 12A , Figure 12B The structure of the bracket 1J in the fifteenth embodiment is the same as that in the fourth embodiment. Therefore, an overall illustration of the bracket 1J is omitted in the fifteenth embodiment. In the description and drawings of the fifteenth embodiment, parts that perform the same functions as in the fourth embodiment are labeled with the same reference numerals, and repeated descriptions are omitted as appropriate. In the fifteenth embodiment, the ring directions in which the units are connected to each other at an angle relative to the radial (circumferential) RD are defined as ring directions CD1 and CD2.

[0232] Figure 33A This is a virtual unfolded view of the first support body 310 of the fifteenth embodiment unfolded into a planar shape. Figure 33B This is a virtual unfolded view of the second support body 320 of the fifteenth embodiment unfolded into a planar shape. Figure 33C This is a virtual unfolded diagram of the support 1J of the fifteenth embodiment as a planar shape.

[0233] The first support body 310 of the fifteenth embodiment has external units 312J (described later) with different structures, including pillars 311, among a plurality of external units 312. For example... Figure 33A As shown, the first stent body 310 of the fifteenth embodiment has an outer unit 312 (hereinafter also referred to as "outer unit 312J") that omits the struts 311a-311b arranged in the circumferential direction CD1. In the outer unit 312J, a protrusion 314p is formed at the intersection 314 of one of the struts 311b not connected to the strut 311 extending along the circumferential direction CD1. Since the protrusion 314p protrudes distally to LD2, interference between the protrusion 314p and the end of the catheter can be suppressed when the intravascular dilatated stent 1H is re-inserted into the catheter. In addition, the outer unit 312J can be regularly arranged in the first stent body 310 or irregularly arranged. In the first stent body 310 of the fifteenth embodiment, the other structures are the same as those of the fourth embodiment.

[0234] The second support body 320 of the fifteenth embodiment has internal units 322J (described later) with different structures, including pillars 321, among a plurality of internal units 322. For example... Figure 33B As shown, the second stent body 320 of the fifteenth embodiment has an inner unit 322 (hereinafter also referred to as "inner unit 322J") that omits the struts 321b of a set of struts 321a-321b arranged in the circumferential direction CD1. In the inner unit 322J, a protrusion 324p is formed at the intersection 324 of one of the struts 321b not connected to, where it connects to the strut 321 extending along the circumferential direction CD1. Since the protrusion 324p protrudes distally to LD2, interference between the protrusion 324p and the end of the catheter can be suppressed when the intravascular dilatation stent 1H is re-inserted into the catheter. Furthermore, the inner unit 322J can be arranged regularly or irregularly. In the second stent body 320 of the fifteenth embodiment, the other structures are the same as in the fourth embodiment.

[0235] As an example, in the bracket 1J of the fifteenth embodiment, the plurality of outer units 312 (including 312J) constituting the first bracket body 310 and the plurality of inner units 322 (including 322J) constituting the second bracket body 320 are configured to have the same size, shape, and arrangement. That is, in the fifteenth embodiment, Figure 33A The grid pattern of the first support body 310 shown and Figure 33B The grid pattern of the second support body 320 shown is substantially the same. Alternatively, the grid pattern of the first support body 310 and the grid pattern of the second support body 320 may be different.

[0236] like Figure 33CAs shown, in the bracket 1J of the fifteenth embodiment, the first bracket body 310 and the second bracket body 320 overlap in such a way that the second intersection portion 324 of the inner unit 322 (second bracket body 320) is disposed in the gap portion 313 of the outer unit 312 (first bracket body 310). Specifically, in the structure in which the second intersection portion 324 of the inner unit 322 is disposed in the gap portion 313 of the outer unit 312 (312J), they overlap in such a way that one second intersection portion 324 of the inner unit 322 is disposed in the gap portion 313 of the outer unit 312 (312J).

[0237] Like the fifteenth embodiment, even in the case of Figure 33A and Figure 33B With the unit shapes constituting each support body in that manner, by overlapping the grid patterns of each support body as described above, the density of the grid pattern on the support as a whole increases, thus further increasing the surface area of ​​the support 1J. Furthermore, in the support 1J of the fifteenth embodiment, similar to the support 1C of the fourth embodiment, the expanded diameter support 1J is bent into a roughly U-shape (see reference). Figure 7 In this case, the outer unit 312 (312J) and inner unit 322 (322J) that are laid out on the radial RD can be bent more flexibly, thus further improving the shape compliance of the support 1J.

[0238] In the stent 1J of the fifteenth embodiment, the protrusion 314p of the first stent body 310 and the protrusion 324p of the second stent body 320 both protrude distally to LD2. Therefore, when the intravascularly enlarged stent 1J is re-inserted into the catheter, interference between the protrusions 314p and 324p and the end of the catheter can be suppressed. Therefore, according to the stent 1J of the fifteenth embodiment, the intravascularly enlarged stent 1J can be smoothly re-inserted into the catheter.

[0239] (Sixteenth Implementation)

[0240] Next, the bracket 1K of the sixteenth embodiment will be described. The unit shapes of the first bracket body and the second bracket body of the bracket 1K of the sixteenth embodiment are the same as those of the fourth embodiment (see reference). Figure 12A , Figure 12BThe structure of the bracket 1K in the sixteenth embodiment is the same as that in the fourth embodiment. Therefore, the overall illustration of the bracket 1K is omitted in the sixteenth embodiment. In the description and drawings of the sixteenth embodiment, the same reference numerals are used for parts that perform the same functions as in the fourth embodiment, and repeated descriptions are omitted as appropriate. In the sixteenth embodiment, the ring directions in which the units are connected to each other at an angle relative to the radial (circumferential) RD are described as ring directions CD1 and CD2. Furthermore, in the sixteenth embodiment, the term "unit" is not limited to the form in which the support column 311 is configured as a frame, but is defined to include forms in which the support column 311 is not configured as a frame (e.g., the outer unit 312K and the inner unit 322K described later).

[0241] Figure 34A This is a virtual unfolded view of the first support body 310 of the sixteenth embodiment unfolded into a planar shape. Figure 34B This is a virtual unfolded view of the second support body 320 of the sixteenth embodiment as a planar shape. Figure 34C This is a virtual unfolded diagram of the support 1K of the sixteenth embodiment as a planar shape.

[0242] The first support body 310 of the sixteenth embodiment has outer units 312K of different sizes among a plurality of outer units 312 (described later). For example Figure 34A As shown, the first support body 310 of the sixteenth embodiment has two adjacent outer units 312 in the circumferential direction CD2, in which the common support column 311 is omitted (hereinafter also referred to as "outer unit 312K"). The gap portion 313K of the outer unit 312K is twice the size of the gap portion 313 of the other outer units 312. In addition, the outer units 312K can be regularly arranged in the first support body 310 or irregularly arranged. In the first support body 310 of the sixteenth embodiment, the other structures are the same as those of the fourth embodiment.

[0243] The second support body 320 of the sixteenth embodiment has inner units 322K of different sizes among a plurality of inner units 322 (described later). For example Figure 34B As shown, the second support body 320 of the sixteenth embodiment has inner units 322 (hereinafter also referred to as "inner units 322K") that omit the common support column 321 in two adjacent inner units 322 in the circumferential direction CD2. The gap portion 323K of the inner unit 322K is twice the size of the gap portion 323 of the other inner units 322. In addition, the inner units 322K can be regularly arranged in the second support body 320 or irregularly arranged. In the second support body 320 of the sixteenth embodiment, the other structures are the same as those of the fourth embodiment.

[0244] like Figure 34CAs shown, in the bracket 1K of the sixteenth embodiment, the first bracket body 310 and the second bracket body 320 overlap in such a way that the second intersection portion 324 of the inner unit 322 (second bracket body 320) is disposed in the gap portion 313 of the outer unit 312 (first bracket body 310). Specifically, in the structure in which the second intersection portion 324 of the inner unit 322 is disposed in the gap portion 313 of the outer unit 312, they overlap in such a way that one second intersection portion 324 of the inner unit 322 is disposed in one gap portion 313 of the outer unit 312. Furthermore, by overlapping the first bracket body 310 and the second bracket body 320 as described above, the bracket 1K becomes a form in which the second intersection portion 324 of the inner unit 322 is disposed in the gap portion 313K of the outer unit 312K.

[0245] Like the sixteenth embodiment, even in the case of Figure 34A and Figure 34B With the unit shapes constituting each support body in that manner, by overlapping the grid patterns of each support body as described above, the density of the grid pattern on the support as a whole increases, thus enabling a further increase in the surface area of ​​the support 1K. Furthermore, in the support 1K of the sixteenth embodiment, similar to the support 1C of the fourth embodiment, the expanded diameter support 1K is bent into a roughly U-shape (see reference). Figure 7 In this case, the outer unit 312 (312K) and inner unit 322 (322K) that are laid out on the radial RD can be bent more flexibly, thus further improving the shape compliance of the support 1K.

[0246] The embodiments of the present invention have been described above, but the present invention is not limited to the foregoing embodiments and various modifications and alterations are possible, which are also included within the technical scope of the present invention. Furthermore, the effects described in the embodiments are merely examples of the best effects produced by the present invention and are not limited to the effects described in the embodiments. In addition, structures incorporating the above embodiments and various modifications and alterations can be appropriately combined, and detailed descriptions are omitted.

[0247] The bracket 1 of the first embodiment has a double-layer structure consisting of a first bracket body 10 and a second bracket body 20, but is not limited thereto. Additional bracket bodies may be provided on the outer side of the first bracket body 10 and / or the inner side of the second bracket body 20. The same applies to brackets in other embodiments.

[0248] In the stent 1 of the first embodiment, a drug agent or a carbon-based material coating can be applied to the surface of the first stent body 10 and / or the second stent body 20. Alternatively, a metal or polymer with high contrast properties can be applied. Examples of drugs used for the same purpose as drug-eluting stents (DES) can be cited. Examples of carbon-based material coatings include antithrombotic passivation coatings such as diamond-like carbon (DLC). The same applies to stents in other embodiments.

[0249] In the seventh to ninth embodiments, the connecting part of the first support body and the connecting part of the second support body can be formed at one location relative to the push wire 2, or at three or more locations.

[0250] In embodiments fourteen through sixteen, the positions of the cross portion omitted from the stent body and the strut are not limited to the examples shown in the illustrations. As long as the stent with increased diameter within the blood vessel can be re-accommodated within the catheter, the positions of the cross portion omitted from the stent body and the strut can be appropriately selected.

[0251] Explanation of reference numerals in the attached figures

[0252] 1, 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1J, 1K: Brackets;

[0253] 2: Push wire;

[0254] 3: Distant shaft;

[0255] 10, 110, 210, 310, 410, 510, 610: First support body;

[0256] 20, 120, 220, 320, 420, 520, 620: Second support body;

[0257] 12, 112, 212, 312 (312J, 312K), 412, 512, 612: External units;

[0258] 22, 122, 222, 322 (322J, 322K), 422, 522, 622: Inner elements;

[0259] 11, 111, 211(211a, 211b), 311(311a, 311b), 411(411a, 411b), 511(511a, 511b), 611: Support (outer unit);

[0260] 21, 121, 221 (221a, 221b), 321 (321a, 321b), 421 (421a, 421b), 521 (521a, 521b), 621: Columns (inner units);

[0261] 13, 113, 213, 313 (313K), 413, 513, 613: Empty portions (outer units);

[0262] 23, 123, 223, 323 (323K), 423, 523, 623: Empty portions (inner units);

[0263] 14, 114: Intersection section (outer unit);

[0264] 24, 124: Intersection section (inner unit);

[0265] 214, 314, 614: Intersecting parts (outer units);

[0266] 224, 324, 624: Intersecting sections (inner units);

[0267] 314, 414, 514: First intersecting part (outer unit);

[0268] 324, 424, 524: Second intersection section (inner unit);

[0269] 314p, 324p: convex part;

[0270] 30: Metal wire;

[0271] 31: Cables with high imaging performance;

[0272] 40: Covering film.

Claims

1. A stent inserted into a catheter for expansion of a blood vessel by being withdrawn from the catheter within the blood vessel, the stent having: The first support body comprises a plurality of first units, each composed of a frame-shaped support column, laid out circumferentially and continuously along a central axis; and The second support body comprises multiple second units, each composed of a frame-shaped support column, arranged circumferentially and continuously along the central axis. The second support body is inserted into the first support body. With the second support body inserted into the first support body, the intersecting portion of the second unit is arranged in the gap of the first unit. In their expanded diameter state, the first support body and the second support body are radially close but not connected to each other. The support is configured such that the proximal end of the first support body and the proximal end of the second support body are connected to the push wire in a non-separable manner.

2. A stent inserted into a catheter for expansion of a blood vessel by being withdrawn from the catheter within the blood vessel, the stent having: The first support body comprises a plurality of first units, each composed of a frame-shaped support column, laid out circumferentially and continuously along a central axis; and The second support body comprises multiple second units, each composed of a frame-shaped support column, arranged circumferentially and continuously along the central axis. The second support body is inserted into the first support body. With the second support body inserted into the first support body, the intersecting portion of the second unit is arranged in the gap of the first unit. In their expanded diameter state, the first support body and the second support body are radially close but not connected to each other. The support is configured such that the proximal end of the first support body and the proximal end of the second support body are connected at different positions in the axial direction of the push wire.

3. The stent according to claim 1 or 2, wherein, When the second support body is inserted into the first support body, the second support body always pushes the first support body radially outward.

4. The stent according to claim 1 or 2, wherein, In a structure in which the intersection portion of the second unit is configured in the gap portion of the first unit, the intersection portion of the second unit is configured in the gap portion of the first unit.

5. The stent according to claim 1 or 2, wherein, With the second support body inserted into the first support body, the proportion of non-gaps in each unit area of ​​the surface of the overlapping portion of the first support body and the second support body is 5 to 50%.

6. The stent according to claim 1 or 2, wherein, The plurality of first units have a set of first pillars and a first pillar arranged at intervals from the set of first pillars in a circumferential direction inclined relative to the circumferential direction. The plurality of second units have a set of second pillars and a second pillar arranged at intervals from the set of second pillars in a circumferential direction inclined relative to the circumferential direction.

7. The stent according to claim 6, wherein, The plurality of the first units are connected at a first intersection in a generally S-shaped manner in a ring direction inclined relative to the circumferential direction. Multiple second units are connected at a generally S-shaped second intersection in a ring direction inclined relative to the circumference.

8. The stent according to claim 7, wherein, The loop direction in which the plurality of first units are connected at the first intersection is radially symmetrical with the loop direction in which the plurality of second units are connected at the second intersection.

9. A recyclable support, comprising: The stent according to claim 1 or 2; and Push wire, The stent is used in locations within a blood vessel where narrowing or blockage occurs. It is advanced from a catheter to dilate the narrowed or blocked vessel, temporarily remaining in place at the location, and then retrieved from the blood vessel by being reinserted into the catheter. The push wire is connected to the proximal end of the bracket.

10. The recyclable stent according to claim 9, wherein, When the second support body is inserted into the first support body, the second support body always pushes the first support body radially outward.

11. The recyclable stent according to claim 9, wherein, In a structure in which the intersection portion of the second unit is configured in the gap portion of the first unit, the intersection portion of the second unit is configured in the gap portion of the first unit.

12. The recyclable stent according to claim 9, wherein, With the second support body inserted into the first support body, the proportion of non-gaps in each unit area of ​​the surface of the overlapping portion of the first support body and the second support body is 5 to 50%.

13. The recyclable stent according to claim 9, wherein, The plurality of first units have a set of first pillars and a first pillar arranged at intervals from the set of first pillars in a circumferential direction inclined relative to the circumferential direction. The plurality of second units have a set of second pillars and a second pillar arranged at intervals from the set of second pillars in a circumferential direction inclined relative to the circumferential direction.

14. The recyclable stent according to claim 13, wherein, The plurality of the first units are connected at a first intersection in a generally S-shaped manner in a ring direction inclined relative to the circumferential direction. Multiple second units are connected at a generally S-shaped second intersection in a ring direction inclined relative to the circumference.

15. The recyclable stent according to claim 14, wherein, The loop direction in which the plurality of first units are connected at the first intersection is radially symmetrical with the loop direction in which the plurality of second units are connected at the second intersection.

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