JP6597171B2 - Stent delivery system - Google Patents

Description

  The present invention relates to a stent delivery system.

  Conventionally, in a stenotic disease (tumor, inflammation, etc.) of a biological tract such as a blood vessel or a digestive tract, a treatment for expanding the stenotic part by placing a stent in the stenotic part has been performed. As a stent, for example, a metal or resin stent is known. In recent years, biodegradable stents have also been proposed that can be reduced over time in blood vessels and gastrointestinal tracts, thus reducing the burden on patients.

  In general, a stent is expanded in diameter after being brought close to the stenosis in a reduced diameter state, thereby pushing the stenosis. For example, a method using an endoscope is known as a method for causing a stent to approach a stenosis. In this method, a stent having a reduced diameter is housed in a thin tubular member called a delivery system, and the delivery system is inserted into an endoscope through a forceps opening (for example, Patent Document 1). reference).

JP 2004-181230 A

  By the way, a resin-made or biodegradable stent is less likely to be deformed from a reduced diameter state to an enlarged diameter state compared to a metal stent, so it is easy to move when the diameter is enlarged, and the stenosis in the living body It was difficult to place it correctly in the club.

  The present invention has been made in view of the above, and an object of the present invention is to provide a stent delivery system capable of accurately placing a resin-made or biodegradable stent in a stenotic part in a living body.

The present invention is a stent delivery system for placing a stent in a living body,
The stent is formed in a cylindrical shape by a resin or biodegradable fiber, and can be deformed from a reduced diameter state to an expanded diameter state, and a string having a proximal end side connected to one end side of the stent main body portion A string-shaped portion, a locking portion formed on the string-shaped portion, and a ring-shaped portion disposed on the other end side of the stent main body portion and formed in a ring shape, the string-shaped portion facing the other end side. The stent main body is maintained in an expanded state by pulling the locking portion to the ring-shaped portion, so that the stent delivery system is capable of accommodating the stent inside the distal end side. A tube, a pusher member that is disposed inside the outer tube and has one end facing the distal end side of the outer tube, and capable of pushing out the stent, and one end that is removable on the distal end side of the string-like portion And is inserted through the ring-shaped portion, A stent comprising: an operating string member that extends inside the outer cylinder along the axial direction of the outer cylinder; and a fixing portion that is disposed on the proximal end side of the outer cylinder and to which the other end side of the operating string member is fixed. Concerning the delivery system.

The present invention is a stent delivery system for placing a stent in a living body,
The stent is formed in a cylindrical shape by a resin or biodegradable fiber, and can be deformed from a reduced diameter state to an expanded diameter state, and a string having a proximal end side connected to one end side of the stent main body portion A string-shaped portion, a locking portion formed on the string-shaped portion, and a ring-shaped portion disposed on the other end side of the stent main body portion and formed in a ring shape, the string-shaped portion facing the other end side. The stent main body is maintained in an expanded state by pulling the locking portion to the ring-shaped portion, so that the stent delivery system is capable of accommodating the stent inside the distal end side. The cylinder, the outer operation portion connected to the proximal end side of the outer cylinder and formed in a cylindrical shape, and disposed inside the outer cylinder, with the one end side disposed toward the distal end side of the outer cylinder A pusher member capable of extruding a stent, and an inner side of the outer operation portion The inner operation portion that is inserted and interlocked with the pusher member and can be advanced and retracted in the axial direction of the outer cylinder, and one end of the inner operation portion are detachably connected to the distal end side of the string-like portion and are inserted into the annular portion, An operating string member extending along the axial direction of the outer cylinder inside the outer cylinder, the inner operating section is rotatable relative to the outer operating section, and the outer operating section is The inner operation unit is restricted from advancing in the axial direction by partly contacting the part of the inner operation unit in the axial direction, and the inner operation unit is rotated to rotate the inner operation unit. The present invention relates to a stent delivery system that allows an inner operation portion to further advance in the axial direction.

  The inner operation portion includes a rotation shaft portion that is inserted into the outer operation portion and serves as a rotation shaft, and a convex portion that protrudes from the rotation shaft portion, and the outer operation portion is formed from a hollow portion thereof. It is preferable to have a concave portion extending radially outward and corresponding to the convex portion.

  Further, when the inner operation portion is advanced in the axial direction until the outer operation portion comes into contact with the inner operation portion, 80 to 95% of the total length of the stent is pushed out from the distal end side of the outer cylinder. preferable.

The present invention is a stent delivery system for placing a stent in a living body,
The stent is formed in a cylindrical shape by a resin or biodegradable fiber, and is deformable from a reduced diameter state to an expanded diameter state, a proximal end side is connected to one end side of the stent main body portion, and the stent A string-like part extending to the other end side of the stent body part, a locking part formed on the string-like part, and a ring-like part arranged on the other end side of the stent body part and formed in a ring shape, The stent body is pulled toward the other end side and the locking portion is locked to the ring-shaped portion, so that the stent main body is maintained in an expanded state, and the stent delivery system is An outer cylinder that can store the stent inside, an inner cylinder that is arranged inside the outer cylinder, and one end that is detachably connected to the distal end side of the string-like part and is inserted into the annular part An operation string member, and the operation string member It extends from the proximal end side of the outer cylinder to the distal end side along the axial direction of the outer cylinder, and at the end part of the distal end side of the outer cylinder of the stent body part from the outside to the inside or from the inside to the outside The present invention relates to a stent delivery system that extends toward the proximal end along the axial direction of the inner cylinder after being folded back.

The present invention is a stent delivery system for placing a stent in a living body,
The stent is formed in a cylindrical shape by a resin or biodegradable fiber, and is deformable from a reduced diameter state to an expanded diameter state, a proximal end side is connected to one end side of the stent main body portion, and the stent A first string-like part extending to the other end side of the stent body part, a first locking part formed on the first string-like part, and a ring shape disposed on the other end side of the stent body part A first ring-shaped portion formed on the second string-shaped portion, a second string-shaped portion whose proximal end side is connected to the other end side of the stent body portion and extends to one end side of the stent body portion, and A second locking portion, and a second ring-shaped portion disposed on one end side of the stent main body portion and formed in a ring shape, the first string-shaped portion and the second string-shaped portion Are pulled toward the other end side and one end side of the main stent body portion, respectively, and the first locking portion and The second locking portion is locked to the first ring-shaped portion and the second ring-shaped portion, respectively, so that the stent main body portion is maintained in an expanded state, and the stent delivery system is An outer cylinder that can store the stent with one end directed toward the distal end, an inner cylinder disposed inside the outer cylinder, and one end on the distal end side of the first string-like portion A first operating string member that is detachably connected and is inserted through the first annular portion and extends between the outer cylinder and the inner cylinder along the axial direction of the outer cylinder, and one end of the first operating string member A second operation string member that is removably connected to the distal end side of the two string-shaped parts and is inserted through the second ring-shaped part and extends inside the inner cylinder along the axial direction of the inner cylinder; A stent delivery system comprising:

The present invention is a stent delivery system for placing a stent in a living body,
The stent is formed in a cylindrical shape by a resin or biodegradable fiber, and is deformable from a reduced diameter state to an expanded diameter state, a proximal end side is connected to one end side of the stent main body portion, and the stent A string-like part extending to the other end side of the stent body part, a locking part formed on the string-like part, and a ring-like part arranged on the other end side of the stent body part and formed in a ring shape, The stent body is pulled toward the other end side, and the locking portion is locked to the ring-shaped portion, so that the stent main body is maintained in an expanded state. An outer cylinder that can store the stent inside, a base member that is arranged inside the outer cylinder and that has one end side facing the distal end side of the outer cylinder and that can push out the stent, and one end of which is Removably connected to the end of the string And an operating string member that is inserted through the ring-shaped portion and extends inside the outer cylinder along the axial direction of the outer cylinder, and the pedestal member advances in the axial direction of the outer cylinder, and The present invention relates to a stent delivery system that supports the other end side of the stent main body portion by extending the radial length of the outer cylinder larger than the diameter of the outer cylinder when discharged to the outside of the cylinder.

  Moreover, it is preferable that the said base member is comprised with the linear shape memory alloy which memorize | stored the state which the length of the radial direction of the said outer cylinder expanded rather than the diameter of the said outer cylinder.

The present invention is a stent delivery system for placing a stent in a living body,
The stent is formed in a cylindrical shape with a resin or biodegradable fiber, and can be deformed from a reduced diameter state to an expanded diameter state, and a proximal end side is connected to the stent main body portion, and the stent main body portion A string-like portion extending along the axial direction of the first, a locking portion formed in the string-like portion, and a first ring-like shape disposed on the outer side of the stent body portion on one end side of the stent body portion. A ring-shaped portion, and a second ring-shaped portion formed inside the stent main body portion in the vicinity of the axial center portion of the stent main body portion and formed in a ring shape, and the string-shaped portion faces one end side. The stent main body is maintained in a state where the diameter of the stent is expanded by pulling the locking portion to the first ring-shaped portion, and the stent delivery system accommodates the stent inside the distal end side. Possible outer cylinder and An inner cylinder disposed inside the outer cylinder; and an operation string member having one end removably coupled to a distal end side of the string-shaped part, wherein the operation string member is a coupling part of the string-shaped part From the outer side of the stent body part along the axial direction of the outer cylinder extends from the proximal end side of the outer cylinder to the distal end side, and is inserted into the first annular part at one end side of the stent body part, The stent body portion is folded from the outside to the inside of the stent body portion at the end portion of the distal end side of the outer tube, and then inserted into the second ring-shaped portion, and the inside of the inner tube is inserted into the shaft of the inner tube. The present invention relates to a stent delivery system extending in the direction toward the proximal side.

  In addition, the stent delivery system includes a stent distal end protective portion that is disposed on the distal end side of the stent main body portion and has a stent housing portion that can accommodate the distal end side of the stent main body portion, and the stent distal end protective portion is attached to the shaft of the outer cylinder. It is preferable to further include an operation tube that can advance and retract in the direction.

  According to the present invention, it is possible to provide a stent delivery system capable of accurately placing a resin-made or biodegradable stent in a stenotic part in a living body.

It is a perspective view which shows the stent in 1st Embodiment of this invention. It is a side view which shows the stent in the said embodiment. It is a perspective view which shows the state which the diameter of the stent in the said embodiment expanded. It is a side view which shows the diameter-expanded state of the stent in the said embodiment. It is a mimetic diagram showing the stent delivery system concerning a 1st embodiment of the present invention. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram which shows the stent delivery system which concerns on 2nd Embodiment of this invention. It is a perspective view of the base end side of the stent delivery system concerning the above-mentioned embodiment. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a perspective view of the proximal end side of a stent delivery system for demonstrating the method of indwelling the stent delivery system which concerns on the said embodiment in a constriction part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a perspective view of the proximal end side of a stent delivery system for demonstrating the method of indwelling the stent delivery system which concerns on the said embodiment in a constriction part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a perspective view of the proximal end side of a stent delivery system for demonstrating the method of indwelling the stent delivery system which concerns on the said embodiment in a constriction part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a perspective view of the proximal end side of a stent delivery system for demonstrating the method of indwelling the stent delivery system which concerns on the said embodiment in a constriction part. It is a perspective view of the proximal end side of a stent delivery system for demonstrating the method of indwelling the stent delivery system which concerns on the said embodiment in a constriction part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram which shows the stent delivery system which concerns on 3rd Embodiment of this invention. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a side view which shows the stent in 4th Embodiment of this invention. It is a schematic diagram which shows the stent delivery system which concerns on 4th Embodiment of this invention. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a side view which shows the stent delivery system in 5th Embodiment of this invention. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a side view which shows the stent in 6th Embodiment of this invention. It is a side view which shows the stent delivery system which concerns on 6th Embodiment of this invention. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a side view which shows the stent delivery system which concerns on 7th Embodiment of this invention. It is a perspective view which shows the front-end | tip cap of the stent delivery system which concerns on the said embodiment. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part. It is a schematic diagram for demonstrating the method to indwell the stent delivery system which concerns on the said embodiment in a stenosis part.

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

<First Embodiment>
FIG. 1 is a perspective view of a stent 1 </ b> A according to the first embodiment of the present invention, and FIG. 2 is a side view of the stent 1. As shown in FIGS. 1 and 2, the stent 1A includes a stent body 11A, two string-like portions 12A and 12A, two locking portions 13A and 13A, and two connecting portions 14A and 14A. Two annular portions 15A, 15A.

  The stent body 11A is formed in a cylindrical shape by the biodegradable fiber 110A. More specifically, the stent main body 11A is knitted in a mesh shape with a plurality of fibers 110A, and has a large number of rhomboid holes formed by the fibers 110A on the outer periphery and regularly arranged.

Examples of the biodegradable fiber 110A include monomers such as L-lactic acid, D-lactic acid, DL-lactic acid, ε-caprolactone, γ-butyrolactone, δ-valerolactone, glycolic acid, trimethylene carbonate, and paradioxanone. Examples include homopolymers, copolymers, and blended polymers thereof.
The fiber 110A may be a monofilament yarn or a multifilament yarn. Moreover, the fiber 110A may be twisted or not.

  The diameter of the fiber 110A is preferably 0.05 to 0.7 mm. When the diameter of the fiber 110A is less than 0.05 mm, the strength of the stent 1A tends to decrease. When the diameter of the fiber 110A exceeds 0.7 mm, the stent 1A tends to be difficult to be accommodated in a thin tubular member such as a delivery system inserted into the endoscope described in detail later. The upper limit of the diameter of the fiber 20 is more preferably 0.4 mm, and still more preferably 0.3 mm, from the viewpoint of storage in a delivery system with a smaller inner diameter. The lower limit of the diameter of the fiber 110A is more preferably 0.2 mm from the viewpoint of maintaining high strength.

  The string-like portion 12A has a proximal end connected to one axial end (X direction) of the stent body 11A and extends to the other axial end (Y direction) of the stent body 11A. More specifically, the string-like portion 12A is connected to the end portion of the stent main body portion 11A in the X direction, and is disposed inside the stent main body portion 11A.

  13 A of latching | locking parts are formed in the front end side (Y direction) of 12 A of string-like parts. The locking portion 13A is disposed inside the stent body 11A as shown in FIGS. The locking portion 13A is formed in a shape protruding outward in the radial direction of the string-like portion 12A. The locking part 13A may be a knot of the string-like part 12A, or may be a triangular return member formed on the string-like part 12A. Moreover, 13 A of latching parts may form a part of string-like part 12A in ring shape. The string-like portion 12A and the locking portion 13A may be made of a biodegradable material, or may be made of a material that is not biodegradable.

  The connecting portion 14A is disposed on the distal end side of the string-like portion 12A and is formed in an annular shape. That is, the connecting portion 14A is disposed on the distal end side with respect to the locking portion 13A. An operation string member 6A described later is removably connected to the connecting portion 14A. More specifically, the operation string member 6A is removably coupled to the other end side (Y direction) of the string-shaped part 12A by being inserted into the coupling part 14A and folded back. The operation string member 6A is inserted into a ring-shaped portion 15A described later as shown in FIGS.

The annular portion 15A is disposed on the other end side (Y direction) of the stent main body portion 11A and is formed in an annular shape. More specifically, the ring-shaped portion 15A is disposed at the end portion in the Y direction of the stent main body portion 11A, and is formed so as to protrude inside the stent main body portion 11A.
Two string-like portions 12A, locking portions 13A, connecting portions 14A, and ring-like portions 15A are arranged at equal intervals in the circumferential direction of the stent body portion 11A.

The operation of the stent 1A will be described with reference to FIGS. FIG. 3A is a perspective view showing a state where the diameter of the stent 1A is expanded, and FIG. 4 is a side view showing a state where the diameter of the stent 1A is expanded.
The stent main body 11A is expanded in diameter by contracting in the axial direction as shown in FIGS. 3 and 4 by pulling the operation string member 6A connected to the string-shaped part 12A in the Y direction.

  The locking portion 13A passes the annular portion 15A from the X direction to the Y direction by pulling the operation string member 6A in the Y direction. The engaging portion 13A that has passed through the annular portion 15A is engaged with the annular portion 15A. The locking portion 13A cannot be passed in the X direction from the Y direction of the ring-shaped portion 15A by being locked to the ring-shaped portion 15A. In this way, the locking portion 13A and the ring-shaped portion 15A restrict the diameter reduction of the stent main body portion 11A from the expanded state, and the stent main body portion 11A is expanded in diameter (FIGS. 3 and 4). maintain.

Next, the stent delivery system 2A according to this embodiment will be described.
FIG. 5 is a diagram schematically showing the stent delivery system 2A. As shown in FIG. 5, the stent delivery system 2A includes an outer cylinder 3A, a pusher member 4A, an operation portion 40A, a guide wire guide tube 5A, an operation string member 6A, and a fixing portion 7A.

The outer cylinder 3A houses the stent 1A inside the distal end side. The stent 1A is arranged with one end side facing the distal end side (X direction in FIG. 5) of the outer cylinder.
The pusher member 4A is arranged on the inner side of the outer cylinder 3A so as to extend from the proximal end side of the outer cylinder 3A to the distal end side. The pusher member 4A is in contact with the other end (end in the Y direction) of the stent 1A at the tip. The pusher member 4A can push out the stent 1A from the outer cylinder 3A.

The operation unit 40A is connected to the proximal end of the pusher member 4A. The operation unit 40A is interlocked with the pusher member 4A and can advance and retreat in the axial direction of the outer cylinder 3A.
The guide wire guide tube 5A has a distal tip 50A that is disposed on the distal end side and closes the distal end of the outer cylinder 3A. The guide wire guide tube 5A is located inside the pusher member 4A, has a through hole extending from the tip 50A to the operation unit 40A, and a guide wire (not shown) is inserted into the through hole. The stent delivery system 2A is guided to be inserted into the body.

The operation string member 6A extends inside the outer cylinder 3A along the axial direction of the outer cylinder 3A. The operation string member 6A has one end folded back connected to the connecting portion 14A, and the other end divided into two hands is disposed on the base end side (Y direction) of the outer cylinder 3A.
7 A of fixing parts are arrange | positioned at the base end side of 3 A of outer cylinders, and the other end side (Y direction) of 6 A of operation string members is fixed. More specifically, the fixed portion 7A has a hole portion 70A that communicates from the inside to the outside of the outer cylinder 3A. The other end of the operation string member 6A divided into two hands is inserted through the hole 70A. The operation string member 6A inserted through the hole 70A forms a knot 60A on the outer side of the outer cylinder 3A.

  A method of placing the stent 1A in a stenotic part in a living body using the stent delivery system 2A will be described with reference to FIGS. 6 to 10 are schematic diagrams for explaining a method of placing the stent 1A in the stenosis.

  First, the stent delivery system 2A in which the stent 1A is housed in the outer cylinder 3A is inserted into a forceps port of an endoscope (not shown). Subsequently, as shown in FIG. 5, the stent delivery system 2 </ b> A is arranged so that the distal end side is located in the vicinity of the stenosis N.

  Subsequently, as shown in FIG. 6, the pusher member 4A is fixed, and the outer cylinder 3A is retracted in the axial direction (Y direction). By retracting the outer cylinder 3A, the stent 1A is pushed out of the outer cylinder 3A. On the other hand, since the other end side (Y direction) of the operation string member 6A is fixed to the fixing portion 7A, the pusher member 4A is retracted, so that the operation string member 6A is relatively in the Y direction with respect to the stent main body portion 11A. Be drawn. When the operation string member 6A is pulled in the Y direction relative to the stent body 11A, the diameter of the portion of the stent body 11A that is pushed out from the outer cylinder 3A is increased.

  Subsequently, the pusher member 4A is further advanced in the axial direction of the outer cylinder 3A. As the pusher member 4A advances, as shown in FIG. 7, the stent body 11A further expands in diameter, and pushes the stenosis N. By further advancing the pusher member 4A, the locking portion 13A passes through the ring-shaped portion 15A and is locked.

Subsequently, as shown in FIG. 8, the operation string member 6A is cut in the vicinity of the knot 60A.
Subsequently, the operation string member 6A is pulled from the fixed portion 7A side, and the operation string member 6A is removed from the connecting portion 14A as shown in FIG.

  Subsequently, as shown in FIG. 10, the stent delivery system 2 </ b> A is separated from the stenosis N. Thus, as shown in FIG. 11, the stent 1 </ b> A is placed in the stenosis N while being maintained in an expanded state.

The stent delivery system 2A according to the first embodiment has the following effects.
(1) In the first embodiment, the stent delivery system 2A for placing the stent 1A in the living body includes an outer cylinder 3A that can accommodate the stent 1A, a pusher member 4A that can extrude the stent 1A, and the stent 1A. An operation string member 6A that is detachably connected to the distal end side of the string-like part 12A included in the outer ring 3A, and a fixing part 7A that is disposed on the proximal end side of the outer cylinder 3A and to which the other end side of the operation string member 6A is fixed. It was supposed to be prepared.
Thereby, by moving the pusher member 4A in the axial direction of the outer cylinder 3A, the operation string member 6A can be pulled relative to the stent body 11A while pushing out the stent 1A from the outer cylinder 3A. Then, by moving the pusher member 4A, the locking portion 13A can be locked to the annular portion 15A. Therefore, in the present embodiment, the diameter of the stent body 11A and the fixation to the expanded state can be performed while pushing out the stent 1A from the outer tube 3A. Can be detained.

Second Embodiment
The stent delivery system 2B according to the second embodiment of the present invention places a stent 1B having the same configuration as the stent 1A in the first embodiment in a living body. About the stent 1B, the code | symbol similar to the stent 1A is attached | subjected, and description is abbreviate | omitted.

  FIG. 12A is a diagram schematically illustrating a stent delivery system 2B according to the second embodiment. FIG. 12B is a perspective view of the proximal end side of the stent delivery system 2B. 12A and 12B, the stent delivery system 2B includes an outer tube 3B, an outer operation part 30B, a pusher member 4B, an inner operation part 40B, a guide wire guide tube 5B, and an operation string member 6B. And comprising.

The outer cylinder 3B houses the stent 1B inside the distal end side. The stent 1B is arranged with one end side facing the distal end side (X direction in FIG. 12A) of the outer cylinder.
The outer operation unit 30B is connected to the proximal end side of the outer cylinder 3B. The outer operation unit 30B is formed in a cylindrical shape that is thicker than the outer cylinder 3B. The hollow portion of the outer operation unit 30B communicates with the hollow portion of the outer cylinder 3B in the axial direction of the outer cylinder 3B. Further, as shown in FIG. 12B, the outer operation portion 30B has a pair of grooves 31B and 31B formed to extend radially outward from the hollow portion. The groove portions 31B and 31B extend in the axial direction of the outer cylinder 3B from the end portion in the Y direction of the outer operation portion 30B.

  The pusher member 4B is disposed on the inner side of the outer cylinder 3B so as to extend from the proximal end side of the outer cylinder 3B to the distal end side. The pusher member 4B is in contact with the other end (end in the Y direction) of the stent 1B. The pusher member 4B can push out the stent 1B from the outer cylinder 3B by proceeding in the axial direction of the outer cylinder 3B.

  The inner operation portion 40B is connected to the proximal end of the pusher member 4B. The inner operation portion 40B can move in the axial direction of the outer cylinder 3B in conjunction with the pusher member 4B. Moreover, the inner side operation part 40B can rotate relatively with respect to the outer side operation part 30B. As illustrated in FIG. 12B, the inner operation unit 40B includes a rotation shaft part 41B that is inserted into the outer operation unit 30B and serves as a rotation shaft, and a pair of wings 42B and 42B that protrude from the rotation shaft part 41B. The wing 42B is formed in a position and shape corresponding to the groove 31B. That is, the angle formed by the pair of wings 42B and 42B around the axis of the rotation shaft portion 41B coincides with the angle formed by the pair of grooves 31B and 31B around the center axis of the outer operation portion 30B.

The guide wire guide tube 5B includes a tip 50B that is disposed on the tip side and closes the tip of the outer cylinder 3B. The guide wire guide tube 5B has a through hole extending from the distal tip 50B to the inner operation portion 40B, and a guide wire (not shown) is inserted into the through hole, whereby the stent delivery system 2B is inserted into the body. To guide you.
The operation string member 6B is disposed so as to extend inside the outer cylinder 3B along the axial direction of the outer cylinder 3B.

  A method of placing the stent 1B in a stenotic part in a living body using the stent delivery system 2B will be described with reference to FIGS. 13A to 17 as well. FIG. 13A to FIG. 17 are views for explaining a method of placing the stent 1B in the stenosis.

  First, the stent delivery system 2B in which the stent 1B is housed in the outer cylinder 3B is inserted into a forceps port of an endoscope (not shown). Subsequently, as illustrated in FIG. 12A, the stent delivery system 2 </ b> A is disposed so that the distal end side is positioned in the vicinity of the stenosis N. In the state of FIG. 12A, the wing 42B and the groove portion 31B are arranged with the angle around the axis of the outer cylinder 3B being shifted.

  Subsequently, by operating the inner operation portion 40B, the pusher member 4B is advanced in the axial direction of the outer cylinder 3B as shown in FIG. 13A. The pusher member 4B advances in the axial direction of the outer cylinder 3B, thereby pushing out the stent 1B from the outer cylinder 3B. And as shown in FIG. 13B, the outer side operation part 30B contacts the part of the inner side operation part 40B in the axial direction of the outer cylinder 3B, so that the inner side operation part 40B further advances in the axial direction. Restrict. At this time, the stent 1B is not completely discharged to the outside of the outer cylinder 3B, and a part of the other end side (Y direction) of the stent 1B remains inside the outer cylinder 3B.

  By moving the inner operation portion 40B in the axial direction of the outer cylinder 3B until the outer operation portion 30B contacts the inner operation portion 40B (wing 42B), 80 to 95% of the total length of the stent 1B is the tip of the outer cylinder 3B. Preferably it is extruded from the side.

  Subsequently, as shown in FIGS. 14A and 14B, the operation string member 6B is pulled in the Y direction with respect to the stent body 11B, thereby expanding the diameter of the portion pushed out of the outer tube 3B of the stent body 11B. Then, the stenosis N is expanded. Then, by further pulling the operation string member 6B, the locking portion 13B is locked to the ring-shaped portion 15B while expanding the narrowed portion N.

Subsequently, as shown in FIGS. 15A and 15B, the operation string member 6B is pulled from the inner operation section 40B side, and the operation string member 6B is removed from the connecting section 14B as shown in FIG.
Subsequently, as shown in FIG. 16B, the inner operation part 40B is rotated around the axis of the outer cylinder 3B, thereby aligning the positions of the wing 42B and the groove part 31B. By aligning the positions of the wing 42B and the groove portion 31B, the outer operation portion 30B allows the inner operation portion 40B to further advance in the axial direction of the outer cylinder 3B. Then, in the state where the positions of the wing 42B and the groove 31B are aligned, as shown in FIGS. 16A and 16C, the inner operation portion 40B is advanced in the axial direction of the outer cylinder 3B, and the entire stent 1B is moved to the outer cylinder 3B. Extrude from the tip side. At this time, the wing 42B is inserted into the groove 31B. When the entire stent 1B is pushed out from the distal end side of the outer cylinder 3B, the diameter of the entire stent body 11B is increased.

  Finally, as shown in FIG. 17, the stent delivery system 2B is separated from the stenosis N. In this way, the stent 1B is placed in the stenosis N while being maintained in an expanded state.

The stent delivery system 2B according to the second embodiment has the following effects.
(2) In the second embodiment, the stent delivery system 2B for indwelling the stent 1B in the living body is connected to the outer cylinder 3B that can accommodate the stent 1B, and the proximal end side of the outer cylinder 3B, and is cylindrical. The formed outer operation part 30B, the pusher member 4B capable of pushing out the stent 1B, and the inner side inserted through the outer operation part 30B and interlocked with the pusher member 4B in the axial direction of the outer cylinder 3B. The operation part 40B and the operation string member 6B removably connected to the distal end side of the string-like part 12B included in the stent 1B are provided. In addition, it is assumed that the inner operation unit 40B is rotatable relative to the outer operation unit 30B, and the outer operation unit 30B has a part of the axial direction of the outer cylinder 3B with respect to a part of the inner operation unit 40B. The inner operation portion 40B is restricted from advancing in the axial direction by abutting the head, and the inner operation portion 40B is allowed to further advance in the axial direction by rotating the inner operation portion 40B.
As a result, the outer operation portion 30B is in contact with the inner operation portion 40B, thereby restricting the inner operation portion 40B from moving in the axial direction. Therefore, when the pusher member 4B is advanced in the axial direction of the outer cylinder 3B. Unintentionally pushing out the entire stent 1B from the distal end side of the outer cylinder 3B can be prevented. Further, by leaving a part of the stent 1B inside the outer cylinder 3B, the stent 1B can be stably supported even when the operation string member 6B is pulled to expand the diameter of the stent body 11B. The stent 1B can be easily placed in the stenosis N.

(3) In 2nd Embodiment, the inner side operation part 40B shall have the rotating shaft part 41B penetrated by the outer side operation part 30B and used as a rotating shaft, and the wing 42B protruded from the rotating shaft part 41B, The outer side operation part 30B shall have the groove part 31B corresponding to the wing 42B inside.
As a result, the stent 1B can be placed in the stenosis N more easily.

(4) In the second embodiment, the stent 1B has 80 to 95% of the total length by causing the inner operation portion 40B to advance in the axial direction of the outer cylinder 3B until the outer operation portion 30B contacts the inner operation portion 40B. The outer cylinder 3B is pushed out from the front end side.
Thereby, the stent 1B can be stably supported when the diameter of the main stent body portion 11B is expanded while discharging most of the stent 1B from the tip of the outer cylinder 3B.

<Third Embodiment>
The stent delivery system 2C according to the third embodiment of the present invention places a stent 1C having the same configuration as the stent 1A in the first embodiment in a living body. About the stent 1C, the code | symbol similar to the stent 1A is attached | subjected, and description is abbreviate | omitted.

  FIG. 18 is a diagram schematically illustrating a stent delivery system 2C according to the third embodiment. As shown in FIG. 18, the stent delivery system 2C includes an outer cylinder 3C, an inner cylinder 8C, an operation portion 80C, a guide wire guide tube 5C, and an operation string member 6C.

The outer cylinder 3C houses the stent 1C inside the distal end side. The stent 1C is arranged with one end side to which the string-like portion 12C is connected facing the distal end side (X direction in FIG. 18) of the outer cylinder 3C. Here, the string-like portion 12C extends in the Y direction along the axial direction of the stent main body portion 11C inside the stent main body portion 11C.
The inner cylinder 8C is disposed on the inner side of the outer cylinder 3C so as to extend from the proximal end side to the distal end side of the outer cylinder 3C. The inner cylinder 8C is disposed on the other end side (Y direction) of the stent 1C. The inner cylinder 8C can push out the stent 1C from the outer cylinder 3C by proceeding in the axial direction of the outer cylinder 3C.

The operation unit 80C is connected to the proximal end of the inner cylinder 8C. The operation unit 80C is interlocked with the inner cylinder 8C and can advance and retreat in the axial direction of the outer cylinder 3C.
The guide wire guide tube 5C has a tip 50C that is disposed on the tip side and closes the tip of the outer cylinder 3C. The guide wire guide tube 5C is located inside the inner cylinder 8C and has a through hole extending from the distal tip 50C to the operation portion 80C, and a guide wire (not shown) is inserted into the through hole, whereby the stent The delivery system 2C is guided to be inserted into the body.

  The operation string member 6C extends from the distal end side of the string-like part 12C to the other end of the stent body part 11C in the Y direction inside the stent body part 11C. At this time, the operation string member 6C is inserted into the annular portion 15C. The operation string member 6C is folded back from the inside of the stent body 11C to the outside at the other end of the stent body 11C, and extends outside the stent body 11C in the X direction to one end of the stent body 11C. Further, the operation string member 6C extends from the outside of the stent body 11C to the inside at one end of the stent body 11C (the distal end side of the outer cylinder 3C), and then extends inside the stent body 11C in the Y direction. At this time, the operation string member 6C is inserted through the annular portion 15C again. The operation string member 6C extends inside the inner cylinder 8C along the axial direction of the inner cylinder 8C.

  A method of placing the stent 1C in a stenotic part in a living body using the stent delivery system 2C will be described with reference to FIGS. 19 to 22 as well. 19 to 22 are views for explaining a method of placing the stent 1C in the stenosis.

  First, the stent delivery system 2C in which the stent 1C is housed in the outer cylinder 3C is inserted into a forceps port of an endoscope (not shown). Subsequently, as illustrated in FIG. 18, the stent delivery system 2 </ b> C is disposed such that the distal end side is positioned in the vicinity of the stenosis N.

  Subsequently, by operating the operation unit 80C, the inner cylinder 8C is advanced in the axial direction of the outer cylinder 3C as shown in FIG. The inner cylinder 8C advances in the axial direction of the outer cylinder 3C, thereby pushing out the stent 1C from the outer cylinder 3C.

  Subsequently, the operation string member 6C is pulled toward the proximal end side of the stent delivery system 2C. Since the operation string member 6C is folded back from the outside of the stent body 11C on the distal end side (X direction) of the outer cylinder 3C, the operation string member 6C is formed on the outer side of the stent 1C from the other end side of the stent 1C. Pulled to one end. When the operation cord member 6C is pulled from the other end side of the stent 1C to the one end side, as shown in FIG. 20, the stent body 11C is turned back on the distal end side (X direction) of the outer cylinder 3C. The diameter is increased by being supported by the portion. The operation string member 6C is inserted through the ring-shaped portion 15C when the operation string member 6C is folded back at the distal end side of the outer cylinder 3C and then extends to the distal end of the inner cylinder 8C, whereby the inner cylinder 8C side (Y direction) of the stent main body portion 11C is It becomes difficult to expand the diameter. Then, by continuously pulling the operation string member 6C, the locking portion 13C passes through the ring-shaped portion 15C and is locked as shown in FIG.

  Subsequently, as shown in FIG. 22, the operation string member 6 </ b> C is removed from the connecting portion 14 </ b> C. By removing the operating string member 6C from the connecting portion 14C, the entire stent body 11C is expanded in diameter. Finally, the stent delivery system 2C is separated from the stenosis N. In this way, the stent 1C is retained in the stenosis N while being maintained in an expanded state.

The stent delivery system 2C according to the third embodiment has the following effects.
(5) In the third embodiment, a stent delivery system 2C for indwelling the stent 1C in the living body includes an outer cylinder 3C capable of accommodating the stent 1C, an inner cylinder 8C disposed inside the outer cylinder 3C, An operation string member 6C that is detachably connected to the distal end side of the string-like portion 12C included in the stent 1C. Further, the operation string member 6C extends from the proximal end side of the outer cylinder 3C to the distal end side and is folded back from the outside of the stent main body 11C on the distal end side of the outer cylinder 3C, and then the inner portion of the inner cylinder 8C is pivoted. It shall extend toward the base end side of the stent delivery system 2C along the direction.
Thus, even when the entire stent 1C is discharged to the outside of the outer cylinder 3C, the stent body 11C is expanded while being stably supported by the folded portion of the operation string member 6C on the distal end side (X direction) of the outer cylinder 3C. The locking portion 13C can be locked to the ring-shaped portion 15C by making the diameter. Therefore, according to the stent delivery system 2C according to the present embodiment, the stent 1C can be easily placed in the stenosis N.

<Fourth embodiment>
The stent delivery system 2D according to the fourth embodiment of the present invention places a stent 1D having a configuration different from that of the stent 1A according to the first embodiment in a living body. About the stent 1D, about the structure similar to the stent 1A, the code | symbol similar to the stent 1A is attached | subjected, description is abbreviate | omitted, and it demonstrates centering on the structure different from the stent 1A.

FIG. 23 is a side view showing a stent 1D according to a fourth embodiment of the present invention.
As shown in FIG. 23, the stent 1D includes a stent body 11D, a first string-like part 121D, a second string-like part 122D, a first locking part 131D, and a second locking part. 132D, 1st connection part 141D, 2nd connection part 142D, 1st ring-shaped part 151D, and 2nd ring-shaped part 152D are provided.

  The first string-like portion 121D has a proximal end connected to one axial end (X direction) of the stent main body 11D and extends to the other axial end (Y direction) of the stent main body 11D. On the other hand, the second string-like portion 122D has a proximal end side connected to the other axial end side (Y direction) of the stent main body portion 11D and extends to one axial end side (X direction) of the stent main body portion 11D. . Thus, in the stent 1D, the two string-like portions are configured to extend in opposite directions.

The first locking portion 131D and the second locking portion 132D are formed on the distal ends of the first string-like portion 121D and the second string-like portion 122D that are not connected to the stent body 11D, respectively.
The first connecting portion 141D and the second connecting portion 142D are disposed at the distal ends of the first string-like portion 121D and the second string-like portion 122D that are not connected to the stent body 11D, and are formed in an annular shape. The A first operation string member 61D and a second operation string member 62D, which will be described later, are detachably connected to the first connection part 141D and the second connection part 142D, respectively. Note that the first operation string member 61D and the second operation string member 62D are inserted through a first ring-shaped part 151D and a second ring-shaped part 152D, which will be described later, respectively, as shown in FIG.

  The first ring-shaped portion 151D and the second ring-shaped portion 152D are respectively arranged in the other end side (Y direction) and one end side (X direction) end portions of the stent main body portion 11D and formed in a ring shape. The first annular portion 151D and the second annular portion 152D are formed so as to protrude to the inside of the stent main body portion 11D.

The stent body 11D pulls the first operation string member 61D and the second operation string member 62D connected to the first connection part 141D and the second connection part 142D, respectively, in the Y direction and the X direction, respectively. To contract and expand the diameter in the axial direction.
The first locking portion 131D and the second locking portion 132D are locked to the first ring-shaped portion 151D and the second ring-shaped portion 152D, respectively, and maintain the stent body portion 11D in an expanded state.

  FIG. 24 is a diagram schematically showing a stent delivery system 2D according to the fourth embodiment. As shown in FIG. 24, the stent delivery system 2D includes an outer cylinder 3D, an inner cylinder 8D, an operation unit 80D, a guide wire guide tube 5D, a first operation string member 61D, and a second operation string member. 62D.

The outer cylinder 3D houses the stent 1D inside the distal end side. The stent 1D is arranged with one end side to which the first string-like portion 121D is connected facing the distal end side (X direction in FIG. 24) of the outer cylinder 3D. Here, the first string-like portion 121D extends in the Y direction along the axial direction of the stent main body 11D inside the stent main body 11D. On the other hand, the second string-like portion 122D extends in the X direction along the axial direction of the stent main body 11D inside the stent main body 11D.
The inner cylinder 8D is disposed on the inner side of the outer cylinder 3D so as to extend from the proximal end side to the distal end side of the outer cylinder 3D. The distal end side of the inner cylinder 8D is disposed inside the stent 1D. The inner cylinder 8D can travel in the axial direction of the outer cylinder 3C.

The operation unit 80D is connected to the proximal end of the inner cylinder 8D. The operation unit 80D is interlocked with the inner cylinder 8D and can advance and retreat in the axial direction of the outer cylinder 3C.
The guide wire guide tube 5D includes a distal tip 50D that is disposed on the distal end side and closes the distal end of the outer cylinder 3D. The guide wire guide tube 5D has a through hole extending from the distal tip 50D to the operation unit 80D, and a guide wire (not shown) is inserted into the through hole, whereby the stent delivery system 2D is inserted into the body. To guide you through.

The first operating string member 61D extends between the outer cylinder 3D and the inner cylinder 8D along the axial direction of the outer cylinder 3D.
The second operation string member 62D extends from the distal end side of the second string-like portion 122D to the one end of the stent body portion 11D (the distal end of the inner cylinder 8D) in the X direction inside the stent body portion 11D. At this time, the second operation string member 62D is inserted through the second ring-shaped portion 152D. The second operation string member 62D is folded back at the tip of the inner cylinder 8D, and extends inside the inner cylinder 8D along the axial direction of the inner cylinder 8D.

  A method of placing the stent 1D in a stenotic part in a living body using the stent delivery system 2D will be described with reference to FIGS. FIG. 25 to FIG. 28 are diagrams for explaining a method of placing the stent 1D in the stenosis.

  First, the stent delivery system 2D in which the stent 1D is housed in the outer cylinder 3D is inserted into a forceps port of an endoscope (not shown). Subsequently, as illustrated in FIG. 24, the stent delivery system 2 </ b> D is disposed such that the distal end side is positioned in the vicinity of the stenosis N.

  Subsequently, the inner cylinder 8D is advanced in the axial direction by operating the operation unit 80D. As the inner cylinder 8D advances in the axial direction of the outer cylinder 3D, the stent 1D is pulled toward the distal end side (X direction) of the inner cylinder 8D by the second operation string member 62D, and as shown in FIG. It is completely pulled out from the cylinder 3D.

  Subsequently, the first operation string member 61D and the second operation string member 62D are pulled on the proximal end side of the stent delivery system 2D. As a result, the first string-like portion 121D and the second string-like portion 122D are pulled in opposite directions, and the stent body 11D expands in diameter as shown in FIG. Then, by continuing to pull the first operation string member 61D and the second operation string member 62D, as shown in FIG. 27, the first locking part 131D and the second locking part 132D are respectively connected to the first locking string member 61D and the second locking string member 62D. The ring-shaped portion 151D and the second ring-shaped portion 152D are passed through and locked.

  Subsequently, after removing the first operation string member 61D and the second operation string member 62D from the first connection part 141D and the second connection part 142D, the stent delivery system 2D is narrowed as shown in FIG. Separated from part N. In this way, the stent 1D is placed in the stenosis N while being maintained in an expanded state.

The stent delivery system 2D according to the fourth embodiment has the following effects.
(6) In the fourth embodiment, the stent delivery system 2D for indwelling the stent 1D in the living body includes an outer cylinder 3D that can accommodate the stent 1D, an inner cylinder 8D that is disposed inside the outer cylinder 3D, The first string-like portion 121D provided in the stent 1D is removably connected to the distal end side of the first string-like portion 121D and extends between the outer cylinder 3D and the inner cylinder 8D so as to extend to the proximal end side of the stent delivery system 2D. The operation string member 61D is detachably connected to the distal end side of the second string-like portion 122D included in the stent 1D, and is arranged to extend inside the inner cylinder 8D to the proximal end side of the stent delivery system 2D. The operation string member 62D.
Thereby, the stent 1D is discharged to the outside of the outer cylinder 3C, and the stent main body 11D is expanded in a balanced manner by pulling the first string-like part 121D and the second string-like part 122D extending in opposite directions. Can be made. Therefore, according to the stent delivery system 2D according to the present embodiment, the stent 1D can be easily placed in the stenosis N.

<Fifth Embodiment>
A stent delivery system 2E according to a fifth embodiment of the present invention places a stent 1E having the same configuration as the stent 1A in the first embodiment in a living body. About the stent 1E, the code | symbol similar to the stent 1A is attached | subjected, and description is abbreviate | omitted.

  FIG. 29 is a diagram schematically illustrating a stent delivery system 2E according to the fifth embodiment. As shown in FIG. 29, the stent delivery system 2E includes an outer cylinder 3E, a base member 9E, an operation unit 90E, a guide wire guide tube 5E, and an operation string member 6E.

The outer cylinder 3E houses the stent 1E inside the distal end side. The stent 1E is arranged with one end side facing the distal end side (X direction in FIG. 29) of the outer cylinder.
The pedestal member 9E is disposed on the inner side of the outer cylinder 3E so as to extend from the proximal end side of the outer cylinder 3E to the distal end side. The pedestal member 9E is disposed on the other end side (Y direction) of the stent 1E. The pedestal member 9E can push out the stent 1E from the outer cylinder 3E by proceeding in the axial direction of the outer cylinder 3E. The pedestal member 9E is made of a linear shape memory alloy that stores a state in which the length in the radial direction is wider than the diameter of the outer cylinder 3E. Thereby, the base member 9E has a radial length larger than the diameter of the outer cylinder 3E in a state where the base member 9E advances in the axial direction of the outer cylinder 3E and is discharged to the outside of the outer cylinder 3E.

The operation unit 90E is connected to the base end of the base member 9E. The operation unit 90E is interlocked with the base member 9E and can advance and retreat in the axial direction of the outer cylinder 3E.
The guide wire guide tube 5E includes a tip 50E that is disposed on the tip side and closes the tip of the outer cylinder 3E. The guide wire guide tube 5E has a through hole extending from the distal tip 50E to the operation unit 90E, and a guide wire (not shown) is inserted into the through hole, whereby the stent delivery system 2E is inserted into the body. To guide you through.
The operation string member 6E extends inside the outer cylinder 3E along the axial direction of the outer cylinder 3E.

  A method of placing the stent 1E in the stenosis portion in the living body using the stent delivery system 2E will be described with reference to FIGS. 30 to 32 as well. 30 to 32 are views for explaining a method of placing the stent 1E in the stenosis.

  First, the stent delivery system 2E in which the stent 1E is housed in the outer cylinder 3E is inserted into a forceps port of an endoscope (not shown). Subsequently, as illustrated in FIG. 29, the stent delivery system 2 </ b> E is disposed such that the distal end side is positioned in the vicinity of the stenosis N.

  Subsequently, by operating the operation unit 90E, the base member 9E is advanced in the axial direction of the outer cylinder 3E. As the base member 9E advances in the axial direction of the outer cylinder 3E, as shown in FIG. 30, the stent 1E is completely pushed out of the outer cylinder 3E.

  Subsequently, the operation string member 6E is pulled toward the proximal end side of the stent delivery system 2E. When pulling the operation cord member 6E, the other end side (Y direction) of the stent 1E is supported by the base member 9E. Thus, by pulling the operating string member 6E while supporting the other end side of the stent 1E, the stent body 11E expands in diameter as shown in FIG. 31, and the locking portion 13E passes through the annular portion 15E. And is locked.

  Subsequently, after removing the operating string member 6E from the connecting portion 14E, the base member 9E is pulled and housed inside the outer cylinder 3E as shown in FIG. Then, the stent delivery system 2E is separated from the stenosis N. In this manner, the stent 1E is retained in the stenosis N while being maintained in an expanded state.

The stent delivery system 2E according to the fifth embodiment has the following effects.
(7) In the fifth embodiment, the stent delivery system 2E for placing the stent 1E in the living body includes an outer cylinder 3E that can accommodate the stent 1E, a base member 9E that is disposed inside the outer cylinder 3E, An operation string member 6E that is detachably connected to the distal end side of the string-like portion 12E included in the stent 1E. Further, in a state where the base member 9E advances in the axial direction of the outer cylinder 3E and is discharged to the outside of the outer cylinder 3E, the length in the radial direction is wider than the diameter of the outer cylinder 3E. The other end side was supported.
Thereby, the other end side of the stent body 11E can be expanded in diameter while being stably supported by the pedestal member 9E, and the locking portion 13E can be locked to the annular portion 15E. Therefore, according to the stent delivery system 2E according to the present embodiment, the stent 1E can be easily placed in the stenosis N.

(8) In 5th Embodiment, the base member 9E was comprised with the linear shape memory alloy which memorize | stored the state where the length of the radial direction of the outer cylinder 3E spread rather than the diameter of the outer cylinder 3E.
Thereby, the length of the radial direction of the base member 9E can be expanded more reliably and easily than the diameter of the outer cylinder 3E.

<Sixth Embodiment>
The stent delivery system 2F according to the sixth embodiment of the present invention places a stent 1F having a configuration different from that of the stent according to the first to fifth embodiments in vivo. Hereinafter, regarding the stent 1F, the same configuration as that of the stent 1A will be denoted by the same reference numerals as those of the stent 1A, and the description thereof will be omitted. The configuration different from the stent 1A will be mainly described.

FIG. 33 is a side view showing a stent 1F according to a sixth embodiment of the present invention.
As shown in FIG. 33, the stent 1F includes a stent main body portion 11F, a string-like portion 12F, a locking portion 13F, a connecting portion 14F, a first annular portion 151F, a second annular portion 152F, Is provided.

  The string-like portion 12F is connected to the inside of the stent main body portion 11F in the vicinity of the central portion in the axial direction of the stent main body portion 11F and extends in the axial direction (Y direction) of the stent main body portion 11F. The string-like portion 12F is folded back from the inside to the outside of the stent body 11F on the Y direction side of the stent body 11F.

The locking portion 13F is formed on the distal end side that is not connected to the stent main body portion 11F of the string-like portion 12F.
The connecting portion 14F is disposed at the distal end of the string-like portion 12F that is not connected to the stent body portion 11F and is formed in an annular shape. An operation string member 6F described later is detachably connected to the connecting portion 14F. In addition, as shown in FIG. 33, the operation string member 6F is inserted through a first annular portion 151F and a second annular portion 152F described later.

The first ring-shaped portion 151F is disposed outside the stent main body portion 11F on one end side (X direction) of the stent main body portion 11F and is formed in a ring shape. The first annular portion 151F is formed so as to protrude to the outside of the stent main body portion 11F.
The second ring-shaped portion 152F is disposed inside the stent main body portion 11F in the vicinity of the axial central portion of the stent main body portion 11F and is formed in a ring shape. The second annular portion 152F is formed so as to protrude to the inside of the stent main body portion 11F.

The stent body portion 11F is expanded in diameter by contracting in the axial direction by pulling the operation string member 6F connected to the connecting portion 14F in the X direction.
The locking portion 13F is locked to the first ring-shaped portion 151F and maintains the stent body portion 11F in an expanded state.
The string-like portion 12F, the locking portion 13F, the connecting portion 14F, the first ring-like portion 151F, and the second ring-like portion 152F are each arranged at equal intervals in the circumferential direction of the stent main body portion 11F.

  FIG. 34 is a view schematically showing a stent delivery system 2F according to the sixth embodiment. As shown in FIG. 34, the stent delivery system 2F includes an outer cylinder 3F, an inner cylinder 8F, an operation unit 80F, a guide wire guide tube 5F, and an operation string member 6F.

The outer cylinder 3F stores the stent 1F inside the distal end side. The stent 1F is arranged with one end side where the first ring-shaped portion 151F is arranged facing the distal end side (X direction in FIG. 34) of the outer cylinder 3F.
The inner cylinder 8F is disposed on the inner side of the outer cylinder 3F so as to extend from the proximal end side to the distal end side of the outer cylinder 3F. The inner cylinder 8F is disposed on the other end side (Y direction) of the stent 1F. The inner cylinder 8F can push the stent 1F out of the outer cylinder 3F by proceeding in the axial direction of the outer cylinder 3F.

The operation unit 80F is connected to the proximal end of the inner cylinder 8F. The operation unit 80F is interlocked with the inner cylinder 8F and can advance and retreat in the axial direction of the outer cylinder 3F.
The guide wire guide tube 5F has a tip 50F that is disposed on the tip side and closes the tip of the outer cylinder 3F. The guide wire guide tube 5F is located inside the inner cylinder 8F and has a through hole extending from the distal tip 50F to the operation unit 80F, and a guide wire (not shown) is inserted into the through hole, whereby the stent The delivery system 2F is guided to be inserted into the body.

  The operation string member 6F extends from the distal end side (connecting portion 14F) of the string-like portion 12F to the outer side of the stent main body portion 11F from the proximal end side of the outer cylinder 3F along the axial direction of the outer cylinder 3F (Y direction). ). The operation string member 6F is inserted through the first ring-shaped portion 151F on one end side (X direction) of the stent main body portion 11F. The operation string member 6F is folded back from the outside to the inside of the stent body 11F at the end on the distal end side of the stent 1F, and then inserted into the second ring-shaped portion 152F. And the operation string member 6F is extended toward the base end side along the axial direction of the inner cylinder 8F inside the inner cylinder 8F.

  A method of placing the stent 1F in a stenotic part in a living body using the stent delivery system 2F will be described with reference to FIGS. FIGS. 35 to 37 are views for explaining a method of placing the stent 1F in the stenosis.

  First, the stent delivery system 2F in which the stent 1F is housed in the outer cylinder 3F is inserted into a forceps port of an endoscope (not shown). Subsequently, as shown in FIG. 34, the stent delivery system 2F is arranged such that the distal end side is positioned in the vicinity of the stenosis N.

  Subsequently, by operating the operation unit 80F, the inner cylinder 8F is advanced in the axial direction of the outer cylinder 3F as shown in FIG. The inner cylinder 8F advances in the axial direction of the outer cylinder 3F, thereby pushing out the stent 1F from the outer cylinder 3F. At this time, the tip of the inner cylinder 8F advances to the position where the second annular portion 152F is disposed.

  Subsequently, the operation string member 6F is pulled toward the proximal end side of the stent delivery system 2F. By pulling the operation string member 6F, as shown in FIG. 36, the operation string member 6F is pulled in the X direction outside the stent body 11F, and the diameter of the stent body 11F is increased. When the diameter of the stent body 11F is expanded, the tip of the inner cylinder 8F is caught by the second ring-shaped portion 152F and supports the stent body 11F. The second annular portion 152F is attracted to the distal end of the inner cylinder 8F, so that the vicinity of the central portion in the axial direction of the stent main body portion 11F is difficult to expand. Then, by continuously pulling the operation string member 6F, as shown in FIG. 36, the locking portion 13F passes through the first annular portion 151F and is locked.

  Subsequently, as shown in FIG. 37, the operation string member 6F is removed from the connecting portion 14F. By removing the operating string member 6F from the connecting portion 14F, the entire stent body 11F is expanded in diameter. Finally, the stent delivery system 2F is separated from the stenosis N. In this way, the stent 1F is placed in the stenosis N while being maintained in an expanded state.

The stent delivery system 2F according to the sixth embodiment has the following effects.
(9) In the sixth embodiment, a stent delivery system 2F for placing the stent 1F in the living body includes an outer cylinder 3F that can accommodate the stent 1F, an inner cylinder 8F that is disposed inside the outer cylinder 3F, An operation string member 6F that is detachably connected to the distal end side of the string-like portion 12F included in the stent 1F. Further, the operation string member 6F extends from the coupling part 14F of the string-like part 12F to the distal end side from the proximal end side of the outer cylinder 3F along the axial direction of the outer cylinder 3F from the proximal end side of the outer cylinder 3F. 11F is inserted into the first annular portion 151F at one end side, and is folded back from the outside of the stent body portion 11F at the distal end side of the stent 1F, and then inserted into the second annular portion 152F. The inside of the inner cylinder 8F extends toward the base end side along the axial direction of the inner cylinder 8F.
Thereby, after discharging the whole stent 1F outside the outer cylinder 3F, when expanding the diameter of the stent main body part 11F, the distal end of the inner cylinder 8F is hooked on the second ring-shaped part 152F. Can be stably supported, and the locking portion 13F can be locked to the first ring-shaped portion 151F. Therefore, according to the stent delivery system 2F according to the present embodiment, the stent 1F can be easily placed in the stenosis N. Further, since the second ring-shaped portion 152F is disposed in the vicinity of the central portion in the axial direction of the stent main body portion 11F, the diameter of the stent main body portion 11F is expanded while fixing the central portion in the axial direction of the stent main body portion 11F. be able to. Therefore, the positioning of the stent 1F when the stent 1F is placed in the stenosis N is easy.

<Seventh embodiment>
The stent delivery system 2G according to the seventh embodiment of the present invention places a stent 1G having the same configuration as the stent 1A in the first embodiment in a living body. Hereinafter, for the stent 1G, the same components as those of the stent 1A are denoted by the same reference numerals as those of the stent 1G, and description thereof is omitted.

FIG. 38A is a view schematically showing a stent delivery system 2G according to the seventh embodiment, and FIG. 38B is an enlarged view of the distal end cap 50G. The stent delivery system 2G of the seventh embodiment of the present invention is different from the first to sixth embodiments mainly in the configuration of a distal end cap 50G as a stent distal end protecting part included in the guide wire guide tube 5G. More specifically, the distal end cap 50G has a stent accommodating portion 52G as shown in FIG. 38B.
The stent accommodating portion 52G is disposed on the proximal end side of the distal end cap 50G and is configured to accommodate the distal end side of the stent main body portion 11G. In the seventh embodiment, the stent housing portion 52G is formed by a recess formed on the proximal end side of the distal end cap 50G and recessed on the distal end side.

  A method of placing the stent 1G in a stenotic part in a living body using the stent delivery system 2G will be described with reference to FIGS. 39 to 43 are views for explaining a method of placing the stent 1G in the stenosis N. FIG.

  First, the stent delivery system 2G in which the distal end side of the stent 1G is accommodated in the stent accommodating portion 52G and the proximal end side of the stent 1G is accommodated in the outer cylinder 3G is inserted into a forceps port of an endoscope (not shown). Subsequently, as shown in FIG. 38A, the stent delivery system 2G is arranged so that the distal end side is located in the vicinity of the stenosis N.

  Subsequently, by operating the operation unit 80G and the guide wire guide tube 5G as the operation tube, the inner tube 8G and the guide wire guide tube 5G are advanced in the axial direction of the outer tube 3G as shown in FIG. The inner cylinder 8G advances in the axial direction of the outer cylinder 3G, thereby pushing out the stent 1G and the distal end cap 50G accommodating the distal end side of the stent 1G from the outer cylinder 3G.

  Subsequently, as shown in FIG. 40, the operation of the guide wire guide tube 5G is stopped, so that the position of the distal end cap 50G is stopped, the operation portion 80G is operated, and the stent 1G is further moved by the inner cylinder 8G. Extrude in the direction. Here, the position of the distal end side (X direction) of the stent body 11G is fixed by being accommodated in the distal end cap 50G, but the proximal end side (Y direction) of the stent 1G is moved in the X direction by the inner cylinder 8G. Extruded. Therefore, the stent body 11G pushed from the outer cylinder 3G is expanded in diameter by compressing the stent body 11G between the stopped distal end cap 50G and the inner cylinder 8G. Further, since the diameter of the stent body 11G expands in a state where the distal end side of the stent body 11G is accommodated in the stent accommodation part 52G, the retracting direction (Y direction) of the distal end side of the stent body 11G accompanying the diameter expansion of the stent 1G. The shift to is reduced.

  Subsequently, by pulling the operation string member 6G toward the proximal end side of the stent delivery system 2G, the locking portion 13G passes through the ring-shaped portion 15G and is locked as shown in FIG.

  Subsequently, by operating the guide wire guide tube 5G, the distal end cap 50G is advanced in the X direction with respect to the stent body 11G as shown in FIG. Thereby, the distal end side of the stent main body portion 11G is released from the stent accommodating portion 52G, and the distal end side of the stent main body portion 11G is expanded in diameter.

  Subsequently, as shown in FIG. 43, the operation string member 6G is removed from the connecting portion 14G. Finally, the stent delivery system 2G is separated from the stenosis N. In this way, the stent 1G is retained in the stenosis N while being maintained in an expanded state.

The stent delivery system 2G according to the seventh embodiment has the following effects.
(10) In the seventh embodiment, when the stent body 11G is compressed between the stopped tip cap 50G and the inner cylinder 8G, the stent body 11G pushed out from the outer cylinder 3G expands in diameter. did.
Thereby, since tension | tensile_strength of the operation string member 6G etc. accompanying the diameter expansion of a stent can be reduced, it can prevent that the operation string member 6G etc. are damaged.

(11) In the seventh embodiment, since the stent body 11G expands in a state where the distal end side of the stent body 11G is housed in the stent housing 52G, the distal end side of the stent body 11G accompanying the diameter expansion of the stent 1G The shift in the regression direction (Y direction) is reduced.
Thereby, the stent 1G can be easily placed in the stenosis N.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
In each of the above embodiments, a stent formed in a cylindrical shape with biodegradable fibers is used as a stent to be placed in a living body, but the stent in the present invention is not limited to this. As the stent in the present invention, a stent formed into a cylindrical shape from a resin that is not biodegradable can also be used.

  Moreover, in each said embodiment, although the string-shaped part, the latching | locking part, the connection part, and the ring-shaped part were each arrange | positioned at equal intervals in the circumferential direction of the stent main-body part, the structure of the stent in this invention Is not limited to this. For example, when the stent has three or more string-like portions, locking portions, connecting portions, and ring-shaped portions, the strength of the stent can be improved and fail-safe during operation can be ensured.

  In the second embodiment, the inner operation portion 40B has a wing 42B protruding from the rotating shaft portion 41B, and the outer operation portion 30B has a groove portion 31B corresponding to the wing 42B inside. The present invention is not limited to this. In the present invention, for example, the outer operation portion may have a convex portion protruding inward, and the inner operation portion may have a concave portion corresponding to the convex portion of the outer operation portion.

  In the second embodiment, when operating the stent delivery system 2B, the wing 42B is adjusted to the groove 31B of the outer operation portion 30B by rotating the inner operation portion 40B. The operation method of the stent delivery system 2B is not limited to this. When operating the stent delivery system 2B, the groove 31B may be aligned with the wing 42B by rotating the outer operation unit 30B. Thus, the direction where the outer side operation part 30B was rotated can suppress the twist of the operation string member 6B. Further, when the outer operation portion 30B is rotated in the operation of the stent delivery system 2B, the outer operation portion 30B is independent of the outer tube 3B in order to prevent the entire outer tube 3B from rotating in the body. It is preferable that the structure can be rotated.

  Moreover, in 3rd Embodiment, as shown in FIG. 18, although the inner cylinder 8C shall be arrange | positioned at the other end side (Y direction) of the stent 1C, this invention is not limited to this. In the present invention, the distal end of the inner cylinder 8C may be disposed inside the stent 1C. When the tip of the inner cylinder 8C is arranged inside the stent 1C, it is necessary to provide a protrusion for pushing out the stent 1C outside the inner cylinder 8C.

  In the third embodiment, the operation string member 6C is folded at one end of the stent body 11C (the distal end side of the outer cylinder 3C) and then extends inside the stent body 11C in the Y direction. It is inserted through the annular portion 15C again. However, the operation string member 6C only needs to be inserted once into the annular portion 15C, and may not be inserted through the annular portion 15C again after being folded at one end of the stent main body portion 11C.

  In the third embodiment, the operation string member 6C is folded back from the outside of the stent body 11C to the inside at the distal end side of the outer cylinder 3C, and then the inner end of the inner cylinder 8C is axially extended along the axial direction. However, the present invention is not limited to this. In the present invention, the operation string member 6C extends from the inner side to the outer side of the stent body 11C on the distal end side of the outer cylinder 3C and then extends to the proximal end side along the axial direction in the inner cylinder 8C. It is good.

  Moreover, in 5th Embodiment, although the base member 9E was comprised with the shape memory alloy, this invention is not limited to this. In the present invention, the base member may be constituted by a balloon.

  In the sixth embodiment, in the state where the tip of the inner cylinder 8F is hooked on the second ring-shaped portion 152F (see FIG. 35), it is possible to push the stent body 11F from the other end side (Y direction). A child part may be arranged. Thereby, the stent 1F can be easily extruded from the outer cylinder 3F.

  In the seventh embodiment of the present invention, the stent delivery system 2G is configured to place the stent 1G having the same configuration as the stent 1A in the first embodiment in the living body, but the present invention is not limited to this. Stent delivery system 2G is good also as what indwells the stent which has the structure equivalent to stent 1C, stent 1D, or stent 1F in 3rd, 4th, or 6th embodiment in the living body.

  In the seventh embodiment, the distal end cap 50G is configured to accommodate the distal end side of the stent 1G. However, the present invention is not limited to this. A configuration for accommodating the distal end side of the stent 1G may be provided separately from the distal end cap 50G. Thereby, the material most suitable for the structure which accommodates the front end side of the front end cap 50G and the stent 1G can be selected.

  Moreover, in 7th Embodiment, although the stent accommodating part 52G was comprised by the recessed part dented in the front end side, this invention is not limited to this. The distal end side of the stent may be fixed to the proximal end surface of the distal end cap 50G. For example, the distal end side of the stent 1G is attached to the proximal end surface of the distal end cap 50G via a biodegradable adhesive. It may be fixed. In this case, it is possible to prevent the stent 1G from being fitted inside the stent housing portion 52G.

  Further, in the seventh embodiment, by pulling the operation string member 6G toward the proximal end side of the stent delivery system 2G, the locking portion 13G is locked through the annular portion 15G (see FIG. 41). By manipulating the guide wire guide tube 5G, the distal end cap 50G is advanced in the X direction with respect to the stent main body portion 11G, so that the distal end side of the stent main body portion 11G is released from the stent accommodating portion 52G. Although the tip side is assumed to have a larger diameter (see FIG. 42), the present invention is not limited to this. After performing the operation of releasing the distal end side of the stent body 11G (see FIG. 42), an operation of pulling the operation string member 6G toward the proximal end side of the stent delivery system 2G (see FIG. 41) may be performed. Thereby, the diameter expansion of the front end side of the stent main-body part 11G and the stent main-body part 11G is promoted by operation which pulls the operation string member 6G.

1A, 1B, 1C, 1D, 1E, 1F, 1G ... Stent 11A, 11B, 11C, 11D, 11E, 11F, 11G ... Stent body part 12A, 12B, 12C, 12E, 12F, 12G ... String-like part 121D ... 1st string-like part 122D ... 2nd string-like part 13A, 13B, 13C, 13E, 13F, 13G ... locking part 131D ... 1st locking part 132D ... 2nd locking part 15A, 15B, 15C, 15E, 15F, 15G ... ring-shaped portion 151D ... first ring-shaped portion 151F ... first ring-shaped portion 152D ... second ring-shaped portion 152F ... second ring-shaped portion 2A, 2B, 2C, 2D, 2E, 2F, 2G ... Stent delivery system 3A, 3B, 3C, 3D, 3E, 3F, 3G ... outer cylinder 30B ... outer side operation part 31B ... groove part (concave part)
4A, 4B ... Pusher member 40B ... Inside operation part 42B ... Wing (convex part)
5G ... Guide wire guide tube (operation tube)
50G ... Tip cap (Stent tip protector)
52G ... Stent accommodating portion 6A, 6B, 6C, 6E, 6F, 6G ... Operation string member 61D ... First operation string member 62D ... Second operation string member 7A ... Fixed section 8C, 8D, 8G ... Inner tube 9E ... Base member

Claims (10)

A stent delivery system for placing a stent in a living body,
The stent is
A stent body part that is formed into a cylindrical shape by a resin or biodegradable fiber and is deformable from a reduced diameter state to an expanded diameter state;
A string-like portion whose proximal end is connected to one end of the stent body,
A locking part formed on the string-like part;
An annular portion disposed on the other end side of the stent body portion and formed in an annular shape,
The string-shaped part is pulled toward the other end side, and the locking part is locked to the ring-shaped part, so that the stent body part is maintained in an expanded state,
Stent delivery system
An outer cylinder capable of storing the stent inside the distal end side;
A pusher member that is arranged inside the outer cylinder and is capable of extruding the stent arranged with one end side facing the distal end side of the outer cylinder;
An operation string member having one end removably connected to the distal end side of the string-shaped part and inserted through the ring-shaped part, and extending inside the outer cylinder along the axial direction of the outer cylinder,
A stent delivery system comprising: a fixing portion that is disposed on a proximal end side of the outer cylinder and to which the other end side of the operation string member is fixed. A stent delivery system for placing a stent in a living body,
The stent is
A stent body part that is formed into a cylindrical shape by a resin or biodegradable fiber and is deformable from a reduced diameter state to an expanded diameter state;
A string-like portion whose proximal end is connected to one end of the stent body,
A locking part formed on the string-like part;
An annular portion disposed on the other end side of the stent body portion and formed in an annular shape,
The string-shaped part is pulled toward the other end side, and the locking part is locked to the ring-shaped part, so that the stent body part is maintained in an expanded state,
Stent delivery system
An outer cylinder capable of storing the stent inside the distal end side;
An outer operation portion connected to the proximal end side of the outer cylinder and formed in a cylindrical shape;
A pusher member that is arranged inside the outer cylinder and is capable of extruding the stent arranged with one end side facing the distal end side of the outer cylinder;
An inner operation portion that is inserted inside the outer operation portion and is capable of moving back and forth in the axial direction of the outer cylinder in conjunction with the pusher member;
One end is removably connected to the distal end side of the string-shaped part and is inserted into the ring-shaped part, and includes an operation string member that extends inside the outer cylinder along the axial direction of the outer cylinder,
The inner operation unit is rotatable relative to the outer operation unit,
The outer operation part restricts the inner operation part from advancing in the axial direction by a part of the outer operation part being in contact with the part of the inner operation part in the axial direction, and the inner operation part is A stent delivery system that allows the inner operation portion to further advance in the axial direction by rotating. The inner operation portion includes a rotation shaft portion that is inserted into the outer operation portion and serves as a rotation shaft, and a convex portion that protrudes from the rotation shaft portion,
The stent delivery system according to claim 2, wherein the outer operation portion is formed to extend radially outward from a hollow portion thereof and has a concave portion corresponding to the convex portion.   The stent is pushed out from the distal end side of the outer cylinder by 80 to 95% of the total length by advancing the inner operation portion in the axial direction until the outer operation portion comes into contact with the inner operation portion. 3. The delivery system according to 3. A stent delivery system for placing a stent in a living body,
The stent is
A stent body part that is formed into a cylindrical shape by a resin or biodegradable fiber and is deformable from a reduced diameter state to an expanded diameter state;
A string-like portion whose proximal end is connected to one end of the stent body and extends to the other end of the stent body;
A locking part formed on the string-like part;
An annular portion disposed on the other end side of the stent body portion and formed in an annular shape,
The stent body is pulled toward the other end side and the locking portion is locked to the ring-shaped portion, so that the stent main body portion is maintained in an expanded state,
Stent delivery system
An outer cylinder capable of storing the stent inside the distal end side;
An inner cylinder disposed inside the outer cylinder;
An operation string member that is detachably connected to the distal end side of the string-shaped part and is inserted into the ring-shaped part; and
The operation string member extends from the proximal end side of the outer cylinder to the distal end side along the axial direction of the outer cylinder, and extends from the outer side of the stent to the inner side or from the inner side to the outer side at the distal end side of the stent. A stent delivery system that extends from the inside of the inner cylinder toward the proximal end along the axial direction of the inner cylinder after being folded. A stent delivery system for placing a stent in a living body,
The stent is
A stent body part that is formed into a cylindrical shape by a resin or biodegradable fiber and is deformable from a reduced diameter state to an expanded diameter state;
A first string-like portion having a proximal end connected to one end of the stent body and extending to the other end of the stent body;
A first locking portion formed on the first string-like portion;
A first ring-shaped portion disposed on the other end side of the stent body and formed in a ring shape;
A second string-like portion having a proximal end connected to the other end of the stent body and extending to one end of the stent body,
A second locking portion formed on the second string-like portion;
A second annular portion disposed on one end side of the stent body portion and formed in an annular shape,
The first string part and the second string part are pulled toward the other end side and the one end side of the stent body part, respectively, so that the first latch part and the second latch part are A stent delivery system for indwelling a stent in which the stent main body is maintained in an expanded state by being locked to the first annular portion and the second annular portion, respectively,
Stent delivery system
An outer tube that can store the stent in a state in which one end side is directed to the distal end side inside the distal end side,
An inner cylinder disposed inside the outer cylinder;
One end is detachably connected to the distal end side of the first string-like part and is inserted into the first ring-like part, and extends between the outer cylinder and the inner cylinder along the axial direction of the outer cylinder. A first operating string member extending;
A second operation in which one end is detachably connected to the distal end side of the second string-like portion and is inserted through the second ring-like portion, and extends inside the inner cylinder along the axial direction of the inner cylinder. A stent delivery system comprising: a string member; A stent delivery system for placing a stent in a living body,
The stent is
A stent body part that is formed into a cylindrical shape by a resin or biodegradable fiber and is deformable from a reduced diameter state to an expanded diameter state;
A string-like portion whose proximal end is connected to one end of the stent body and extends to the other end of the stent body;
A locking part formed on the string-like part;
An annular portion disposed on the other end side of the stent body portion and formed in an annular shape,
The string-shaped part is pulled toward the other end side and the locking part is locked to the ring-shaped part, so that the stent in which the stent main body part is maintained in an expanded state is placed in the living body. A stent delivery system for
Stent delivery system
An outer cylinder capable of storing the stent inside the distal end side;
A pedestal member that is arranged inside the outer cylinder and that can extrude the stent arranged with one end side facing the distal end side of the outer cylinder;
One end is removably connected to the distal end side of the string-shaped part and is inserted into the ring-shaped part, and includes an operation string member that extends inside the outer cylinder along the axial direction of the outer cylinder,
In the state where the base member advances in the axial direction of the outer cylinder and is discharged to the outside of the outer cylinder, the length of the outer cylinder in the radial direction is larger than the diameter of the outer cylinder, so that the stent body Delivery system for supporting the other end of the part.   The stent delivery system according to claim 7, wherein the pedestal member is made of a linear shape memory alloy storing a state in which a length of the outer cylinder in a radial direction is larger than a diameter of the outer cylinder. A stent delivery system for placing a stent in a living body,
The stent is
A stent body part that is formed into a cylindrical shape by a resin or biodegradable fiber and is deformable from a reduced diameter state to an expanded diameter state;
A string-like portion having a proximal end connected to the stent main body and extending along the axial direction of the stent main body;
A locking part formed on the string-like part;
A first ring-shaped portion disposed on the outside of the stent body portion on one end side of the stent body portion and formed in a ring shape;
A second annular portion disposed inside the stent body portion in the vicinity of the central portion in the axial direction of the stent body portion and formed in a ring shape,
The string-shaped part is pulled toward one end side and the locking part is locked to the first ring-shaped part, so that the stent body part is maintained in an expanded state,
Stent delivery system
An outer cylinder capable of storing the stent inside the distal end side;
An inner cylinder disposed inside the outer cylinder;
An operation string member having one end detachably coupled to the distal end side of the string-like portion;
The operation string member extends from the connection part of the string-like part to the distal end side from the proximal end side of the outer cylinder along the axial direction of the outer cylinder, and extends to one end of the stent body part. And is inserted through the second ring-shaped portion after being folded inward from the outside of the stent main body at the end of the outer tube of the stent main body. A stent delivery system that extends inside the inner cylinder toward the proximal end along the axial direction of the inner cylinder. A stent tip protector having a stent housing portion disposed on the distal end side of the stent body portion and capable of housing the distal end side of the stent body portion;
The stent delivery system according to any one of claims 1 to 9, further comprising an operation tube that enables the stent tip protection part to advance and retreat in the axial direction of the outer cylinder.

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