JP2021013405A - Intravascular detention tool coupling structure and intravascular detention system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intravascular indwelling device connection structure and an intravascular indwelling system capable of preventing displacement of the stent graft when connecting and indwelling a plurality of stent grafts and maintaining a good connection state. SOLUTION: In an intravascular indwelling device connecting structure for connecting a first intravascular indwelling device and a second intravascular indwelling device, the first intravascular indwelling device is a connecting portion with a second intravascular indwelling device. In addition, the second intravascular indwelling tool has a locking portion that protrudes in the radial direction of the connecting portion, and has a locked portion that is arranged on the outer peripheral surface of the coating portion. The locked portion extends in the circumferential direction while bending so as to have a bent portion in the axial direction of the second intravascular indwelling device, and the bent portion is on the side far from the locking portion in the axial direction. It has a first bent portion of the above and a second bent portion on the side closer to the axial direction with respect to the locking portion. The first bent portion is fixed to the film portion, and the second bent portion can be locked to the locking portion. [Selection diagram] Fig. 5

Description

The present invention relates to an intravascular indwelling device connection structure and an intravascular indwelling system.

Conventionally, a stent graft in which a skeletal portion called a stent is arranged on the peripheral surface of an artificial blood vessel (graft) is known as an endovascular indwelling tool used for treating aortic aneurysm and aortic dissection occurring in the aorta (for example, patent). Reference 1).

By the way, in stent graft placement, a plurality of stent grafts may be connected depending on the condition of the lesion site. For example, when a stent graft is placed on a lesion site in the aorta, the stent length is selected according to the treatment length (length of the lesion site + neck length on the central and peripheral sides), but one stent graft is used for the treatment length. If it cannot be covered, multiple stent grafts need to be connected. Further, for example, when there is a branched blood vessel in the indwelling region of the stent graft in the aorta, it is necessary to connect the branched blood vessel stent graft to the main blood vessel stent graft in order to secure blood flow to the branched blood vessel. In the following, the stent graft placed first in the blood vessel will be referred to as a “first stent graft”, and the stent graft placed later will be referred to as a “second stent graft”.

Special Table 2009-540930

Usually, a second stent graft having a diameter equal to or larger than the inner diameter of the connecting portion is inserted and expanded in a contracted state in the connecting portion of the first stent graft, and the overlapping portion of the second stent graft and the first stent graft is formed. By abutting, the second stent graft is connected to the first stent graft. In this case, the connection state is maintained by the expanding force of the second stent graft at the overlapping portion.

However, if an attempt is made to maintain the connected state only by the expanding force of the second stent graft, the second stent graft may be displaced in the axial direction due to an excessive external force, which may cause an end leak from the connecting portion.

An object of the present invention is to provide an intravascular indwelling device connection structure and an intravascular indwelling system capable of preventing misalignment of the stent graft when connecting and indwelling a plurality of stent grafts and maintaining a good connection state.

The intravascular indwelling device connection structure according to one aspect of the present invention is
It is an intravascular indwelling device connection structure that connects a plurality of intravascular indwelling devices to be placed in a blood vessel.
The plurality of intravascular indwelling devices include a first intravascular indwelling device and a second intravascular indwelling device that is inserted and connected to the first intravascular indwelling device.
The first and second intravascular indwelling devices have a tubular shape and have a tubular shape.
The first intravascular indwelling tool has a locking portion that protrudes in the radial direction of the connecting portion at the connecting portion with the second intravascular indwelling tool.
The second intravascular indwelling tool has a film portion and a locked portion arranged on the outer peripheral surface of the film portion.
The locked portion extends in the circumferential direction while being bent so as to have a bent portion in the axial direction of the second intravascular indwelling tool.
In a state where the second intravascular indwelling tool is inserted and connected to the connecting portion of the first intravascular indwelling device, the bent portion is the first on the side farther in the axial direction from the locking portion. It has a bent portion and a second bent portion on the side close to the axial direction with respect to the locking portion.
The first bent portion is fixed to the film portion and is fixed.
The second bent portion is characterized in that it can be locked to the locking portion.

The intravascular indwelling system according to one aspect of the present invention is
An intravascular indwelling system with an intravascular indwelling device that is indwelled in a blood vessel.
The intravascular indwelling device includes first and second intravascular indwelling devices connected in a blood vessel.
The first and second intravascular indwelling devices have a tubular shape and have a tubular shape.
The first intravascular indwelling tool has a locking portion that protrudes in the radial direction of the connecting portion at the connecting portion with the second intravascular indwelling tool.
The second intravascular indwelling tool has a film portion and a locked portion arranged on the outer peripheral surface of the film portion.
The locked portion extends in the circumferential direction while being bent so as to have a bent portion in the axial direction of the second intravascular indwelling tool.
In a state where the second intravascular indwelling tool is inserted and connected to the connecting portion of the first intravascular indwelling device, the bent portion is the first on the side farther in the axial direction from the locking portion. It has a bent portion and a second bent portion on the side close to the axial direction with respect to the locking portion.
The first bent portion is fixed to the film portion and is fixed.
The second bent portion is characterized in that it can be locked to the locking portion.

According to the present invention, it is possible to prevent the displacement of the stent graft when connecting and indwelling a plurality of stent grafts, and it is possible to maintain a good connection state.

FIG. 1 is a diagram showing a stent graft set according to an embodiment of the present invention. 2A and 2B are views showing a state in which the stent graft set is placed in the blood vessel. 3A-3C are views showing the configuration of the first stent graft. FIG. 4 is a diagram showing the configuration of the second stent graft. 5A and 5B are views showing the configuration of the connecting end of the second stent graft. 6A and 6B are views showing the locked state of the first stent graft and the second stent graft. 7A and 7B are diagrams showing the configuration of a stent graft indwelling system (intravascular indwelling system) for indwelling a stent graft in a blood vessel. 8A and 8B are views showing another example of the stent graft set.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a stent graft set 1 according to an embodiment of the present invention. 2A and 2B are views showing a state in which the stent graft set 1 is placed in a blood vessel. In the present embodiment, a case where stent grafts 10 and 20 are connected as an intravascular indwelling tool and placed in a blood vessel will be described. The stent graft 10 corresponds to the "first intravascular indwelling device" in the present invention, and the stent graft 20 corresponds to the "second intravascular indwelling device" in the present invention. That is, the vascular indwelling device connection structure according to the present invention is applied to the stent graft set 1.

As shown in FIGS. 1, 2A and 2B, the stent graft set 1 is a stent graft 10 for a main blood vessel (for example, a site where an aortic aneurysm or the like occurs) placed at a lesion site of the aorta V1 which is a main blood vessel (for example, a site where an aortic aneurysm or the like occurs). Hereinafter referred to as "first stent graft 10") and a stent graft 20 for a branched blood vessel placed in a branched blood vessel V2 branching from the aorta V1 in the vicinity of the lesion site (hereinafter referred to as "second stent graft 20"). ), Consists of. The outer diameter of the second stent graft 20 in the expanded state is equal to or greater than the inner diameter of the branch portion 12 of the first stent graft 10.

When the stent graft set 1 is placed in a blood vessel, the first stent graft 10 is first transferred to the lesion site in a contracted state and then placed in the aorta V1 by dilating (see FIG. 2A). Then, the second stent graft 20 is inserted into the branch portion 12 in a contracted state, positioned so that the predetermined lengths overlap, and expanded to be placed in the branch blood vessel V2 (see FIG. 2B). As a result, in the overlapping portion, the inner peripheral surface of the first stent graft 10 (branched portion 12) and the outer peripheral surface of the second stent graft 20 are in close contact with each other, and the first stent graft 10 (branched portion 12) and the second The stent graft 20 is connected. The second stent graft 20 may be transferred through the inside of the first stent graft 10 and interpolated into the branch portion 12, or may be transferred through the branch blood vessel V2 and interpolated into the branch portion 12. May be done.

3A to 3C are views showing the configuration of the first stent graft 10. FIG. 3A is a perspective view of the first stent graft 10. FIG. 3B is a plan view of the first stent graft 10 as viewed from the branch portion 12 side. FIG. 3C is a sectional view taken along the line AA of the branch portion 12 in FIG. 3B. 3A to 3C schematically show the expanded state of the first stent graft 10.

As shown in FIGS. 3A to 3C, the first stent graft 10 has a tubular graft body 11 having openings at both ends and a branch portion 12 provided on the tube wall of the graft body 11.

The graft body 11 has a tubular shape that defines a blood flow path. In the present embodiment, the case where the graft main body 11 has a straight tube shape is shown, but the graft main body 11 corresponds to a curved shape (for example, the shape of the aortic arch of a patient) according to the placement site. It may have a curved shape (shape), or it may have a curved shape along the blood vessel shape after indwelling.

The graft body 11 has a coating portion 111 and a skeleton portion 112. The skeleton portion 112 is sewn and fixed to the peripheral surface of the coating portion 111 with, for example, a suture. The skeleton portion 112 may be fixed to the coating portion 111 by a method other than suturing, such as sticking with tape, adhesion, or welding.

The film portion 111 is a graft portion that serves as a blood flow path. Examples of the material for forming the film portion 111 include a fluororesin such as PTFE (polytetrafluoroethylene) and a polyester resin such as polyethylene terephthalate.

The skeleton portion 112 is a reinforcing member fixed to the peripheral surface of the coating portion 111 and holding the coating portion 111 in a predetermined expanded state. The skeleton portion 112 is, for example, a self-expanding stent skeleton formed in a tubular shape along the peripheral surface of the coating portion 111 while the thin metal wires are folded back in a zigzag shape in the axial direction.

The skeleton portion 112 is configured to be deformable from a contracted state contracted inward in the radial direction to an expanded state in which the skeleton portion 112 expands outward in the radial direction to define a tubular flow path. Examples of the material of the thin metal wire forming the skeleton portion 112 include known metals or metal alloys typified by stainless steel, Ni—Ti alloys, titanium alloys and the like.

The graft body 11 has a recess 11a in which a part of the outer peripheral surface is recessed inward in the radial direction in the expanded state. The recess 11a has a flat bottom surface, and the branch portion 12 is arranged substantially in the center of the bottom surface.

The branch portion 12 is formed so as to project from the tube wall (bottom surface of the recess 11a) of the graft body 11 toward the outside in the radial direction of the graft body 11. The branch portion 12 has a through hole 12a communicating with the lumen of the graft body 11. The second stent graft 20 is interpolated and connected to the through hole 12a of the branch portion 12. A plurality of branch portions 12 may be provided on the tube wall of the graft main body 11.

The branch portion 12 preferably has a tapered shape whose diameter is reduced toward the open end portion of the through hole 12a. As a result, the adhesion between the first stent graft 10 and the second stent graft 20 can be enhanced.

The skeleton portion 112 is not arranged on the branch portion 12. Further, the branch portion 12 is made of the same material as the coating portion 111 of the graft main body 11 and is integrally formed with the graft main body 11. As a result, the branch portion 12 has flexibility such that the opening direction can be changed by the blood flow from the main blood vessel V1 to the branch blood vessel V2, for example.

In the present embodiment, the branch portion 12 has a locking portion 13 protruding in the radial direction at the open end portion of the through hole 12a. In the following, the locking portion 13 protruding inward in the radial direction will be referred to as a “first locking portion 131”, and the locking portion 13 protruding outward in the radial direction will be referred to as a “second locking portion 132”. The locking portion 13 may be arranged near the tip of the opening end instead of the tip of the opening end as long as it overlaps with the second stent graft 20.

The locking portion 13 is formed, for example, by attaching an annular member to the open end portion of the branch portion 12. The annular member is formed of, for example, a highly elastic material such as silicone rubber, and is fixed to the open end of the branch portion 12 by heat welding, ultrasonic welding, pressure bonding, adhesion, stitching, or the like. The annular member may be formed of a rubber material other than silicone, or may be formed of a material other than rubber (for example, metal). Further, rubber or the like may be used as a main material, and a radiation-impermeable substance such as barium sulfate may be added as a secondary material.

The locking portion 13 has a function of preventing the position of the second stent graft 20 from shifting when the second stent graft 20 is connected to the first stent graft 10. Specifically, the locking portion 13 restricts the axial movement of the second stent graft 20 by locking the locked portion 23 (see FIG. 4) of the second stent graft 20. In the present embodiment, the first locking portion 131 and the second locking portion 132 are provided, but either one may be provided.

Further, the locking portion 13 has a function of maintaining the open state of the through hole 12a in the expanded state of the graft body 11, specifically, the opening size of the through hole 12a so that the opening of the through hole 12a is not closed. It also has a function of maintaining the size above a predetermined size. As a result, the insertability when attaching the second stent graft 20 to the branch portion 12 is improved. Further, when the second stent graft 20 is expanded, a force acts radially inward with respect to the second stent graft 20 due to the elasticity of the annular member, so that the branch portion 12 and the second stent graft 20 Adhesion can be improved. The locking portion 13 may not have a function of maintaining the open state of the through hole 12a and a function of urging the second stent graft 20.

FIG. 4 is a diagram showing the configuration of the second stent graft 20. 5A and 5B are views showing an end portion 20a (hereinafter, referred to as “connecting side end portion 20a”) of the second stent graft 20 on the side connected to the first stent graft 10. FIG. 5A is an enlarged view of the connection side end portion 20a. FIG. 5B is a cross-sectional view of the connection side end portion 20a. 4, 5A and 5B schematically show the expanded state of the second stent graft 20. Further, in FIGS. 4 and 5A, the branched portion 12 of the first stent graft 10 is shown by a broken line.

As shown in FIG. 4, the second stent graft 20 has a coating portion 21 and a skeleton portion 22, and has a tubular shape that defines a blood flow path, like the first stent graft 10. Since the configurations of the coating portion 21 and the skeleton portion 22 are the same as the configurations of the coating portion 111 and the skeleton portion 112 of the first stent graft 10, detailed description thereof will be omitted.

In the second stent graft 20, the connecting side end portion 20a preferably has a tapered shape whose diameter increases toward the open end portion. As a result, the adhesion between the first stent graft 10 and the second stent graft 20 can be enhanced.

Further, the second stent graft 20 has a locked portion 23 locked to the locking portion 13 of the first stent graft 10 at the connecting side end portion 20a. In the following, when the first stent graft 10 and the second stent graft 20 are connected, the locked portion 23 arranged at the portion overlapping the branch portion 12 is referred to as the “first locked portion 231”. Refer to. Further, the locked portion 23 arranged in the portion exposed from the branch portion 12 when the first stent graft 10 and the second stent graft 20 are connected is referred to as a “second locked portion 232”. ..

In the present embodiment, the locked portion 23 is formed of a thin metal wire having a predetermined shape and is fixed to the outer peripheral surface of the coating portion 21 like the skeleton portion 22.

Specifically, the first locked portion 231 extends in the circumferential direction while being bent so as to have the bent portions 231a and 231b in the axial direction of the second stent graft 20. When the second stent graft 20 is connected to the first stent graft 10, the bent portion 231a on the side farther in the axial direction from the locking portion 13 of the first stent graft 10 is referred to as a "first bent portion 231a". .. When the second stent graft 20 is connected to the first stent graft 10, the bent portion 231b on the side closer to the axial direction with respect to the locking portion 13 of the first stent graft 10 is referred to as a "second bent portion 231b". ..

In addition, having the bent portions 231a and 231b in the axial direction means that the portions other than the first bent portion 231a are bent in the axial direction in a state where they are not separated from the coating portion 21, as will be described later. .. That is, in a state where the portion other than the first bent portion 231a is separated from the film portion 21, the bent portions 231a and 231b are bent in the direction intersecting the axial direction.

The first bent portion 231a is sewn and fixed to the coating portion 21 with, for example, a suture. On the other hand, the portion of the first locked portion 231 other than the first bent portion 231a, including the second bent portion 231b, is not fixed to the film portion 21. That is, the first locked portion 231 is configured such that the first bent portion 231a is a fixed point and the second bent portion 231b is separated from the film portion 21. In a state where the first stent graft 10 and the second stent graft 20 are connected, an excessive external force acts on the second stent graft 20 and the second stent graft 20 tries to move in the direction of advancing from the branch portion 12. However, since the second bent portion 231b of the first locked portion 231 is caught by the first locking portion 131 of the first stent graft 10, the misalignment can be suppressed within an allowable range (FIG. 6A). reference).

The second locked portion 232 has the same configuration as the first locked portion 231. The second locked portion 232 is attached to the film portion 21 in the opposite manner to the first locked portion 231.

That is, the second locked portion 232 extends in the circumferential direction while being bent so as to have the bent portions 232a and 232b in the axial direction of the second stent graft 20. When the second stent graft 20 is connected to the first stent graft 10, the bent portion 232a on the side axially far from the locking portion 13 of the first stent graft 10 is referred to as "first bent portion 232a". .. When the second stent graft 20 is connected to the first stent graft 10, the bent portion 232b on the side closer to the axial direction with respect to the locking portion 13 of the first stent graft 10 is referred to as a "second bent portion 232b". ..

Note that having the bent portions 232a and 232b in the axial direction means that the portions other than the first bent portion 232a are bent in the axial direction in a state where they are not separated from the coating portion 21, as will be described later. .. That is, in a state where the portion other than the first bent portion 232a is separated from the film portion 21, the bent portions 232a and 232b are bent in the direction intersecting the axial direction.

The second bent portion 232a is sewn and fixed to the coating portion 21 with, for example, a suture. On the other hand, the portion of the second locked portion 232 other than the first bent portion 232a, including the second bent portion 232b, is not fixed to the film portion 21. That is, the second locked portion 232 is configured so that the second bent portion 232b is separated from the film portion 21 with the first bent portion 232a as a fixed point. In the state where the first stent graft 10 and the second stent graft 20 are connected, an excessive external force acts on the second stent graft 20 and the second stent graft 20 tries to move in the direction of entering the branch portion 12. Also, since the second bent portion 232b of the second locked portion 232 is caught by the first locking portion 131 or the second locking portion 132 of the first stent graft 10, the misalignment is within the allowable range. It can be suppressed (see FIG. 6B).

As described above, when the second stent graft 20 is moved axially with respect to the branch portion 12 of the first stent graft 10, the first locked portion 231 or the second locked portion 232 is moved. Since it is locked by the locking portion 13, even if the second stent graft 20 is placed displaced in the axial direction, the position can be easily adjusted by sliding and moving (pulling and shifting) the second stent graft 20 in the expanded state. Can be done.

7A and 7B are views showing the configuration of a stent graft indwelling system 100 (intravascular indwelling system) for indwelling a stent graft in a blood vessel. The stent graft placement system 100 can be used to place the first stent graft 10 and the second stent graft 20 in a blood vessel. FIG. 7A shows a disassembled state of the stent graft placement system 100. FIG. 7B shows the assembled state of the stent graft placement system 100.

As shown in FIGS. 7A and 7B, the stent graft placement system 100 is arranged inside the tubular sheath 101 and the sheath 101, and is configured to be able to move forward and backward in the sheath 101 along the axial direction (longitudinal direction) of the sheath 101. It includes an inner rod 102 and a stent graft 103 (first stent graft 10, second stent graft 20).

The sheath 101 has a tubular sheath main body 101a and a hub 101b provided on the proximal end side (proximal end side) of the sheath main body 101a. Although the description by illustration is omitted, the hub 101b is provided with a nut for fixing the inner rod 102 to the sheath 101 or releasing the fixing thereof.

The sheath 101 is made of a flexible material. Examples of the flexible material include a biocompatible synthetic resin (epolymer) selected from a fluororesin, a polyamide resin, a polyethylene resin, a polyvinyl chloride resin, and the like, and other materials in addition to these resins. Examples thereof include a resin compound in which the above is mixed, a multilayer structure made of these synthetic resins, and a composite of these synthetic resins and a metal wire.

The inner rod 102 has a rod-shaped rod main body 102a, a holding portion 102b for holding the stent graft 103 in a contracted state, and a tip tip 102c provided at the tip (distal end) of the inner rod 102. .. The diameter of the holding portion 102b is set smaller than that of the rod main body portion 102a by, for example, the thickness of the stent graft 103.

Examples of the material constituting the rod main body portion 102a and the holding portion 102b include various materials having appropriate hardness and flexibility such as resin (plastic, elastomer) or metal. As a material constituting the tip 102c, various materials having appropriate hardness and flexibility such as a synthetic resin (elastomer) selected from a polyamide resin, a polyurethane resin, a polyvinyl chloride resin and the like can be used. Can be mentioned.

Although the description by illustration is omitted, the rod body portion 102a, the holding portion 102b, and the tip tip 102c have, for example, a lumen for passing a guide wire and a trigger for expanding the contracted stent graft 103 in the affected portion. Lumens and the like for passing the wire are formed along the axial direction of the inner rod 102.

As described above, the connection structure (intravascular indwelling device connection structure) of the stent graft set 1 according to the present embodiment includes the first stent graft 10 (first intravascular indwelling device) and the second stent graft 20 (second intravascular indwelling device). Intravascular indwelling device) and. The first stent graft 10 and the second stent graft 20 have a tubular shape. The first stent graft 10 has a locking portion 13 protruding in the radial direction of the branch portion 12 at the branch portion 12 (connecting portion with the second stent graft 20). The second stent graft 20 has a coating portion 21 and a locked portion 23 arranged on the outer peripheral surface of the coating portion 21. The locked portion 23 extends in the circumferential direction while being bent so as to have the bent portions 231a, 231b, 232a, and 232b in the axial direction of the second stent graft 20. The bent portions 231a, 231b, 232a, and 232b are axially distant from the locking portion 13 in a state where the second stent graft 20 is interpolated and connected to the branch portion 12 of the first stent graft 10. It has a first bent portion 231a and 232a and a second bent portion 231b and 232b on the side closer to the axial direction with respect to the locking portion 13. The first bent portions 231a and 232a are fixed to the film portion 21, and the second bent portions 231b and 232b can be locked to the locking portion 13.

Further, the stent graft indwelling device 100 (intravascular indwelling system) according to the embodiment includes a stent graft 103 (intravascular indwelling device) to be indwelled in a blood vessel. The stent graft 103 includes a first stent graft 10 (first intravascular indwelling device) and a second stent graft 20 (second intravascular indwelling device) connected in a blood vessel. The first stent graft 10 and the second stent graft 20 have a tubular shape. The first stent graft 10 has a locking portion 13 protruding in the radial direction of the branch portion 12 at the branch portion 12 (connecting portion with the second stent graft 20). The second stent graft 20 has a coating portion 21 and a locked portion 23 arranged on the outer peripheral surface of the coating portion 21. The locked portion 23 extends in the circumferential direction while being bent so as to have the bent portions 231a, 231b, 232a, and 232b in the axial direction of the second stent graft 20. The bent portions 231a, 231b, 232a, and 232b are axially distant from the locking portion 13 in a state where the second stent graft 20 is interpolated and connected to the branch portion 12 of the first stent graft 10. It has a first bent portion 231a and 232a and a second bent portion 231b and 232b on the side closer to the axial direction with respect to the locking portion 13. The first bent portions 231a and 232a are fixed to the film portion 21, and the second bent portions 231b and 232b can be locked to the locking portion 13.

According to the connection structure of the stent graft set 1 and the stent graft placement system 100 according to the present embodiment, the misalignment of the second stent graft 20 when the first stent graft 10 and the second stent graft 20 are connected and placed is prevented. It is possible to maintain a good connection state. Therefore, since end leakage from the connecting portion between the first stent graft 10 and the second stent graft 20 can be prevented, highly reliable stent graft placement can be performed.

Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment and can be changed without departing from the gist thereof.

For example, the branch portion 12 of the first stent graft 10 may have an opening in the tube wall of the graft body 11. In this case, the first locking portion 131 is provided on the inner peripheral edge of the opening, and the opening edge portion of the graft body 11 serves as the second locking portion 132. Further, the branched portion 12 may be formed of a member different from the graft main body 11 and may be joined to the graft main body 11. In this case, the branch portion 12 may be formed of the same material as the coating portion 111 of the graft body 11, or may be formed of a different material.

In the embodiment, an example in which the first locked portion 231 and the second locked portion 232 are provided as the locked portion 23 has been described, but the first locked portion 231 and the second locked portion 231 and the second Only one of the locked portions 232 may be provided. When only the first locked portion 231 is provided, the entry of the second stent graft 20 into the branch portion 12 cannot be suppressed, but the advance from the branch portion 12 is suppressed and the inside of the branch blood vessel V2. The position can be adjusted with. On the other hand, when only the second locked portion 232 is provided, the advance of the second stent graft 20 from the branch portion 12 cannot be suppressed, but the entry into the branch portion 12 and the branch blood vessel are suppressed. The position in V2 can be adjusted.

Further, for example, in the embodiment, the case where the second stent graft 20 for the branched blood vessel is connected to the first stent graft 10 for the main blood vessel has been described, but the present invention connects a plurality of stent grafts to the main blood vessel. That is, as shown in FIGS. 8A and 8B, it can also be applied to a stent graft set 1 in which both the first stent graft 10 and the second stent graft 20 are placed in the main blood vessel. In this case, the axial end 10a of the first stent graft 10 is the connecting portion, and the axial end 20a of the second stent graft 20 is the connecting end. In addition, in FIG. 8A, the axial end portion 10a of the first stent graft 10 and the axial end portion 20a of the second stent graft 20 are schematically shown.
When three or more stent grafts are connected and placed in the main blood vessel, the intermediate stent graft excluding both ends becomes the second stent graft for the stent graft to be placed first, and the stent graft to be placed later. Is the first stent graft.

Further, the locking portion of the first stent graft does not have to have an annular shape along the circumferential direction of the open end portion, and may be arranged intermittently along the circumferential direction of the open end portion, for example. It may have a shape in which a part of the space is missing (for example, a U-shape).

Further, the skeleton portion of the first stent graft and the second stent graft may be formed of a material other than metal (for example, ceramic or resin). The same applies to the locked portion of the second stent graft. Further, the first stent graft and the second stent graft may be a balloon expansion type instead of a self-expansion type.

Further, in the embodiment, the stent graft has been described as an example of the intravascular indwelling device, but the present invention is also applied to the case of connecting another intravascular indwelling device such as an artificial blood vessel (graft). can do.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Stent graft set 10 1st stent graft (1st intravascular indwelling device)
11 Graft body 111 Coating part 112 Skeleton part 12 Branch part 13 Locking part 131 First locking part 132 Second locking part 20 Second stent graft (second intravascular indwelling tool)
21 Film part 22 Skeleton part 23 Locked part 231 First locked part 232 Second locked part 231a, 232a First bent part 231b, 232b Second bent part 100 Stent graft placement system (intravascular) Detention system)

Claims (8)

It is an intravascular indwelling device connection structure that connects a plurality of intravascular indwelling devices to be placed in a blood vessel.
The plurality of intravascular indwelling devices include a first intravascular indwelling device and a second intravascular indwelling device that is inserted and connected to the first intravascular indwelling device.
The first and second intravascular indwelling devices have a tubular shape and have a tubular shape.
The first intravascular indwelling tool has a locking portion that protrudes in the radial direction of the connecting portion at the connecting portion with the second intravascular indwelling tool.
The second intravascular indwelling tool has a film portion and a locked portion arranged on the outer peripheral surface of the film portion.
The locked portion extends in the circumferential direction while being bent so as to have a bent portion in the axial direction of the second intravascular indwelling tool.
In a state where the second intravascular indwelling tool is inserted and connected to the connecting portion of the first intravascular indwelling device, the bent portion is the first on the side farther in the axial direction from the locking portion. It has a bent portion and a second bent portion on the side close to the axial direction with respect to the locking portion.
The first bent portion is fixed to the film portion and is fixed.
The second bent portion is a structure for connecting an intravascular indwelling device, characterized in that the second bent portion can be locked to the locking portion. The inside of a blood vessel according to claim 1, wherein the locked portion is configured such that the first bent portion is a fixed point and the second bent portion is separated from the film portion. Indwelling device connection structure. The intravascular indwelling device connecting structure according to claim 1 or 2, wherein the locking portion has a first locking portion that projects radially inward of the first intravascular indwelling device. The locked portion is arranged at an overlapping portion of the coating portion with the first intravascular indwelling tool in a state where the first intravascular indwelling tool and the second intravascular indwelling device are connected. The intravascular indwelling device connection structure according to claim 3, further comprising a first locked portion. The locked portion is arranged in an exposed portion of the film portion from the first intravascular indwelling tool in a state where the first intravascular indwelling tool and the second intravascular indwelling device are connected. The structure for connecting an intravascular indwelling device according to any one of claims 1 to 4, wherein the second locked portion is provided. The first intravascular indwelling device has a tubular graft body that defines a blood flow path, and a branch portion that is arranged on the tube wall of the graft body.
The intravascular indwelling device connecting structure according to any one of claims 1 to 5, wherein the connecting portion is an open end portion of the branch portion. The first intravascular indwelling device has a tubular graft body that defines a blood flow path and has a tubular graft body.
The intravascular indwelling device connecting structure according to any one of claims 1 to 6, wherein the connecting portion is an open end portion of the graft body. An intravascular indwelling system with an intravascular indwelling device that is indwelled in a blood vessel.
The intravascular indwelling device includes first and second intravascular indwelling devices connected in a blood vessel.
The first and second intravascular indwelling devices have a tubular shape and have a tubular shape.
The first intravascular indwelling tool has a locking portion that protrudes in the radial direction of the connecting portion at the connecting portion with the second intravascular indwelling tool.
The second intravascular indwelling tool has a film portion and a locked portion arranged on the outer peripheral surface of the film portion.
The locked portion extends in the circumferential direction while being bent so as to have a bent portion in the axial direction of the second intravascular indwelling tool.
In a state where the second intravascular indwelling tool is inserted and connected to the connecting portion of the first intravascular indwelling device, the bent portion is the first on the side farther in the axial direction from the locking portion. It has a bent portion and a second bent portion on the side close to the axial direction with respect to the locking portion.
The first bent portion is fixed to the film portion and is fixed.
An intravascular indwelling system characterized in that the second bent portion can be locked to the locking portion.

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