WO2011132897A2 - Surgical stent - Google Patents

Surgical stent Download PDF

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Publication number
WO2011132897A2
WO2011132897A2 PCT/KR2011/002752 KR2011002752W WO2011132897A2 WO 2011132897 A2 WO2011132897 A2 WO 2011132897A2 KR 2011002752 W KR2011002752 W KR 2011002752W WO 2011132897 A2 WO2011132897 A2 WO 2011132897A2
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WO
WIPO (PCT)
Prior art keywords
curved portion
stent
curved portions
links
cells
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PCT/KR2011/002752
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French (fr)
Korean (ko)
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WO2011132897A3 (en
Inventor
김헌영
현창백
유혁상
이승렬
최란
김혜성
노형진
김영완
이광호
박현식
윤수진
김영희
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강원대학교산학협력단
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Publication of WO2011132897A2 publication Critical patent/WO2011132897A2/en
Publication of WO2011132897A3 publication Critical patent/WO2011132897A3/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/9155—Adjacent bands being connected to each other
    • A61F2002/91558—Adjacent bands being connected to each other connected peak to peak
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/9155—Adjacent bands being connected to each other
    • A61F2002/91583—Adjacent bands being connected to each other by a bridge, whereby at least one of its ends is connected along the length of a strut between two consecutive apices within a band

Definitions

  • the present invention relates to a surgical stent, and more particularly to a cylindrical surgical stent that does not contract in the axial direction even when inflated.
  • Abnormally narrowed passages of the lumen such as the esophagus, blood vessels, and bile tracks of the human body, are of course in a state of inability to function as well as to deterioration.
  • a luminal extension device called a stent into the stenosis of the human lumen, the passage of the lumen can be restored to normal.
  • the stent In cardiovascular surgery, a procedure is often performed to place the stent in a location where the artery is damaged. When the stent is placed in an artery, the stent dilates the artery and strengthens blood flow.
  • the preferred form of the stent for implantation in arteries and the like is a cylindrical stent that can expand radially from a small diameter to a large diameter.
  • This cylindrical stent can be inserted into the artery through a catheter and moves inwards through the arterial path of the patient until the unexpanded stent is positioned where desired. Once the stent is in the desired position, the balloon is inflated outwards using a balloon or other expansion mechanism to engage the artery. Cylindrical stents should exhibit sufficient rigidity even after they are expanded. In addition, the stiffness of the stent should be maintained even after the catheter is removed.
  • Cylindrical stents have a variety of shapes to provide adequate performance for a variety of environments.
  • Patent documents such as U.S. Patent Nos. 5,514,154, 5,421,955, 5,242,399, 5,531,741, 5,522,882, 5,507,771, 5,314,444, 5,496,277, 5,494,029, and 5,507,767.
  • Various forms of cylindrical stents are disclosed for implantation into the lumen.
  • expandable stents of U. S. Patent No. 5,514, 154 have a unique structure for limiting the contraction in the axial direction, but is accompanied by a slight contraction such as an axial contraction appearing at the end. Therefore, there is a problem that it is difficult to position the stent after the expansion.
  • the present invention has been made to solve the above problems, it is an object of the present invention, there is no contraction in the axial direction even when expanding in the radial direction, to provide a surgical stent having a strong supporting force after the procedure.
  • Surgical stent according to the present invention for achieving the above object, in the surgical stent forming a cylindrical shape before and after expansion, the first curved portion convex in the circumferential direction, the second curved portion concave in the circumferential direction And a third curved portion convex in the axial direction and a fourth curved portion concave in the axial direction, the first curved portion being connected to the third curved portion and the fourth curved portion, respectively, and the second curved portion being the third curved portion and A plurality of cells connected to the fourth curved portion and spaced apart in a line in the circumferential direction;
  • a ring-shaped stent ring comprising a plurality of first links having a first curved portion and a second curved portion of two adjacent ones of the plurality of cells, the fifth curved portion being axially convex;
  • the point where the first curved portion and the second curved portion meet the plurality of first links is characterized by consisting of a point away from the central axi
  • Using the surgical stent according to the present invention has the effect of minimizing the contraction in the axial direction when inflated to position the stent in the correct position. In addition, there is an effect that can hold a strong support force after the procedure to prevent restenosis of blood vessels and the like.
  • FIG. 1 is a perspective view showing the configuration of a surgical stent in accordance with the present invention.
  • FIG. 2 is an exploded view of the stent of FIG. 1.
  • FIG. 3 is a development view when the surgical stent in accordance with the present invention is contracted.
  • FIG. 4 is an exploded view when the surgical stent according to the present invention is inflated.
  • FIG. 5 is a view comparing before and after deformation when the force according to the expansion is applied to the vertices of the cell in the surgical stent according to the present invention.
  • FIG. 6 is a view comparing before and after deformation when the expanded force is applied to the eccentric point of the cell in the surgical stent according to the present invention.
  • Figure 7 is a perspective view showing the configuration of a surgical stent of another embodiment according to the present invention.
  • FIG. 8 is an exploded view of the stent of FIG. 7.
  • the 'axial direction' refers to the direction of the arrow i shown in the drawing
  • the 'radial direction' refers to the direction of the arrow j shown in the drawing
  • the 'circumferential direction' refers to the direction of the arrow k shown in the drawing.
  • Means. 'Concave' refers to a curved line that goes in the direction indicated by arrows i, j, and k.
  • 'Convex' means the shape of the curve protruding toward the direction indicated by the arrows i, j, k.
  • the surgical stent according to the present invention includes a plurality of stent rings 10 arranged in a row in the axial direction.
  • the stent rings 10 may include a plurality of cells 11 and a plurality of first links 20 that circumferentially connect two adjacent cells 11 of the plurality of cells 11. It consists of.
  • the cells 11 have a deformed truss shape.
  • the cells 11 have a first curved portion 12 convex in the circumferential direction, a second curved portion 13 concave in the circumferential direction, a third curved portion 14 convex in the axial direction, and a fourth concave in the axial direction. It consists of a curved portion 15.
  • the first curved portion 12 is connected to the third curved portion 14 and the fourth curved portion 15 to form an inflection point 16, respectively.
  • the second curved portion 13 is connected to the third curved portion 14 and the fourth curved portion 15 to form an inflection point 16, respectively. Accordingly, the cells 11 form a closed curved surface therein.
  • first curved portion 12 and the second curved portion 13 are symmetrical with each other, and the third curved portion 14 and the fourth curved portion 15 are also symmetrical with each other.
  • the larger shape of the first curved portion 12 and the second curved portion 13 than the third curved portion 14 and the fourth curved portion 15 is stable.
  • the cells 11 are arranged spaced apart in a line in the circumferential direction, and each cell 11 is connected to the first links 20.
  • the first links 20 have a fifth curved portion 21 that is axially convex and connects the first curved portion 12 and the second curved portion 13 of two adjacent cells 11.
  • the point 22 where the first curved portion 12 and the second curved portion 13 meet is preferably eccentrically positioned at a point beyond the vertices of the first curved portion 12 and the second curved portion 13. .
  • FIG. 5 compares before and after deformation when a force due to expansion is applied to the vertices of the first curved portion 12 and the second curved portion 13, and FIG. 6 shows the expanded force acting on the eccentric point. This is a comparison between before and after deformation.
  • the amount of movement of the fourth curved portion 15 is small and is shown in addition to the amount of movement of the third curved portion 14.
  • a space capable of increasing the length of the first links 20, that is, the first links 20 are formed in the cell ( 11)
  • the distance between the points and the connection is long, so that the expansion of the stent during the procedure can be expanded at a larger rate.
  • the force applied to the cells 11 having the eccentric coupling structure as shown in the present invention is smaller than that of the cell having the coupling structure as shown in FIG. 5. do.
  • a surgical stent in accordance with the present invention has a plurality of second links 30 that axially connect the stent rings 10.
  • the second links 30 have a curved shape having two vertices 31 and connect the third curved portion 14 and the fourth curved portion 15 of two adjacent cells 11.
  • the second link 30 should be able to accommodate the bending when the stent is mounted to the curved blood vessel, etc., and has a structure that can secure the supporting force when the stent is expanded and fixed.
  • This structure is embodied in a curved shape with two vertices 31, which accommodates the deformation of the cells 11 and also serves to support the vessel wall in a wide range to prevent the vessel wall from invading into the stent. do.
  • the second links 30 need not limit the number of vertices 31 to two. That is, when the vessel is bent in many sections, a stent having three or more vertices 31 may be used, and a stent having one vertex 31 may be used in a straight section. Normally, it is stable for the second links 30 having two vertices 31 to be used as in this embodiment.
  • FIG. 7 and 8 show another embodiment of a surgical stent in accordance with the present invention.
  • the surgical stent of another embodiment according to the present invention basically has the same configuration as the embodiment shown in Figures 1 and 2, the third curved portion 14 and the fourth curved portion
  • An additional strut 17 is provided. This strut 17 can prevent the axial contraction by minimizing the deformation of the cells 11 that occur during expansion. Since the configuration of the surgical stent according to another embodiment of the present invention is the same as the configuration of the surgical stent according to the present invention described above, a detailed description of the configuration and operation will be omitted.
  • the cells 11, the first links 20, and the second links 30 are all made of a flexible metal material. Such materials may be used as used for ordinary stents.
  • nano-processing is formed on the surfaces of the cells 11, the first links 20, and the second links 30 in order to additionally treat drugs such as thrombolytics, thereby forming a space for accommodating drugs. desirable.
  • the cells 11 formed at the end of the stent may be clearly visible through the medical imaging device during or after implantation of the stent in the body lumen of the patient. It is preferable to be formed of a radio-opaque material such as gold, silver, platinum, and the like. Using the stent as described above can minimize the contraction in the axial direction when inflated, there is an advantage that can be placed in the correct position.

Abstract

The present invention provides a cylindrical surgical stent which is not contracted in an axial direction even during expansion. The invention comprises a ring-shaped stent ring having: a plurality of cells arranged by being spaced in a row in a circumferential direction; and a plurality of first links. The plurality of cells include first curved portions which are convex in a circumferential direction, second curved portions which are concave in a circumferential direction, third curved portions which are convex in an axial direction, and fourth curved portions which are concave in an axial direction. Said first curved portions are respectively connected with the third curved portions and the fourth curved portions, and said second curved portions are respectively connected with the third curved portions and the fourth curved portions. Said first links are formed from a plurality of links, which connect first curved portions and second curved portions of two adjacent cells among the plurality of cells, and have fifth curved portions that are convex in an axial direction. Spots at which the first curved portions and the second curved portions meet the plurality of first links are out of the central axes of the first curved portions and the second curved portions.

Description

외과용 스텐트Surgical stent
본 발명은 외과용 스텐트에 관한 것으로서, 보다 상세하게는 팽창 시에도 축방향으로 수축되지 않는 원통형 외과용 스텐트에 관한 것이다.The present invention relates to a surgical stent, and more particularly to a cylindrical surgical stent that does not contract in the axial direction even when inflated.
인체의 식도, 혈관, 담즙 트랙과 같은 내강의 통로가 비정상적으로 좁아지면 기능의 저하는 물론이거니와 심하게는 아무런 기능을 할 수 없는 상태가 된다. 이러한 경우 스텐트(Stent)라 불리우는 내강 확장용 기구를 인체 내강의 협착 부위에 삽입하여 내강의 통로를 정상으로 복원할 수 있다.Abnormally narrowed passages of the lumen, such as the esophagus, blood vessels, and bile tracks of the human body, are of course in a state of inability to function as well as to deterioration. In this case, by inserting a luminal extension device called a stent into the stenosis of the human lumen, the passage of the lumen can be restored to normal.
심장혈관 수술에서 동맥이 손상된 위치에 스텐트를 위치시키는 시술은 종종 행하여진다. 스텐트가 동맥에 위치되면 스텐트는 동맥을 확장시켜 혈류를 강화시킨다. 특히, 동맥 등에 이식하기 위한 스텐트의 바람직한 형태는 작은 직경으로부터 큰 직경까지 반경방향으로 팽창될 수 있는 원통형 스텐트이다.In cardiovascular surgery, a procedure is often performed to place the stent in a location where the artery is damaged. When the stent is placed in an artery, the stent dilates the artery and strengthens blood flow. In particular, the preferred form of the stent for implantation in arteries and the like is a cylindrical stent that can expand radially from a small diameter to a large diameter.
이러한 원통형 스텐트는 카테터(Catheter)를 통해 동맥 내로 삽입될 수 있고, 팽창하지 않은 스텐트가 원하는 곳에 위치될 때까지 환자의 동맥 경로를 통하여 내부에서 이동한다. 스텐트가 원하는 곳에 위치하면 벌룬(Ballon) 또는 다른 팽창 메커니즘을 이용해 스텐트를 외측으로 팽창시켜 동맥과 결합시킨다. 원통형 스텐트는 팽창된 이후에도 충분한 강성을 나타내어야 한다. 또한, 스텐트의 강성은 카테터가 제거된 이후에도 유지되어야 한다.This cylindrical stent can be inserted into the artery through a catheter and moves inwards through the arterial path of the patient until the unexpanded stent is positioned where desired. Once the stent is in the desired position, the balloon is inflated outwards using a balloon or other expansion mechanism to engage the artery. Cylindrical stents should exhibit sufficient rigidity even after they are expanded. In addition, the stiffness of the stent should be maintained even after the catheter is removed.
원통형 스텐트는 다양한 환경에 대하여 적절한 성능을 제공하기 위하여 다양한 형상을 가진다. 미국등록특허 제5,514,154호, 제5,421,955호, 제5,242,399호, 제5,531,741호, 제5,522,882호, 제5,507,771호, 제5,314,444호, 제5,496,277호, 제5,494,029호, 제5,507,767호 등의 특허문헌들에는 몸체의 내강 내로 이식하기 위한 원통형 스텐트의 다양한 형태가 개시되어 있다.Cylindrical stents have a variety of shapes to provide adequate performance for a variety of environments. Patent documents such as U.S. Patent Nos. 5,514,154, 5,421,955, 5,242,399, 5,531,741, 5,522,882, 5,507,771, 5,314,444, 5,496,277, 5,494,029, and 5,507,767. Various forms of cylindrical stents are disclosed for implantation into the lumen.
한편, 외과의사가 스텐트를 동맥 또는 몸체의 내강 내에 위치시킬 때, 이를원하는 위치에 정확히 위치시키는 것이 매우 중요하다. 만약, 팽창 이전과 이후의 스텐트의 길이가 달라지면, 스텐트를 원하는 위치에 정확히 위치시키는 것은 매우 어려워진다. 이러한 잘못된 위치선정의 문제점은 스텐트가 쉽게 팽창할 뿐만 아니라, 일단 팽창이 되면 수축되지 않는 사실에 의해 되돌리기 어렵다.On the other hand, when the surgeon places the stent in the lumen of the artery or body, it is very important to position it correctly in the desired position. If the length of the stent before and after expansion is different, it is very difficult to position the stent exactly at the desired position. This problem of mispositioning is difficult to reverse due to the fact that the stent not only expands easily, but also does not shrink once expanded.
그런데, 상기와 같은 원통형 스텐트는 반경방향으로 팽창될 때, 축방향의 길이가 감소되는 문제점이 있다. 특히, 미국등록특허 제5,514,154호의 확장형 스텐트(Expandable stents)는 축방향의 수축을 제한하기 위한 특유한 구조를 가지고 있으나, 단부에서 나타나는 축방향 수축 등 약간의 수축이 동반된다. 따라서 스텐트를 팽창 후 원하는 곳에 위치시키기 힘들다는 문제점이 있다.However, when the cylindrical stent is expanded in the radial direction, there is a problem that the length in the axial direction is reduced. In particular, expandable stents of U. S. Patent No. 5,514, 154 have a unique structure for limiting the contraction in the axial direction, but is accompanied by a slight contraction such as an axial contraction appearing at the end. Therefore, there is a problem that it is difficult to position the stent after the expansion.
본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로서, 본 발명의 목적은, 반경 방향으로 팽창하더라도 축방향으로 수축이 없으며, 시술 후 강한 지지력을 가지는 외과용 스텐트를 제공하는 것이다.The present invention has been made to solve the above problems, it is an object of the present invention, there is no contraction in the axial direction even when expanding in the radial direction, to provide a surgical stent having a strong supporting force after the procedure.
이와 같은 목적들을 달성하기 위한 본 발명에 따른 외과용 스텐트는, 팽창 이전과 이후에 원통의 형상을 이루는 외과용 스텐트에 있어서, 원주 방향으로 볼록한 제1 곡선부와, 원주 방향으로 오목한 제2 곡선부와, 축방향으로 볼록한 제3 곡선부와, 축방향으로 오목한 제4 곡선부를 포함하며, 제1 곡선부는 제3 곡선부 및 제4 곡선부와 각각 연결되고, 제2 곡선부는 제3 곡선부 및 제4 곡선부와 각각 연결되며, 원주 방향으로 일렬로 이격되어 배치되는 다수의 셀들과; 다수의 셀들 중 인접하는 두 개의 셀들의 제1 곡선부와 제2 곡선부를 연결하며, 축방향으로 볼록한 제5 곡선부를 가지는 다수의 제1 링크들로 구성되는 링형상의 스텐트링을 포함하며, 제1 곡선부와 제2 곡선부가 다수의 제1 링크들과 만나는 지점은 제1 곡선부와 제2 곡선부의 중심축에서 벗어난 지점으로 이루어지는 것에 특징이 있다.Surgical stent according to the present invention for achieving the above object, in the surgical stent forming a cylindrical shape before and after expansion, the first curved portion convex in the circumferential direction, the second curved portion concave in the circumferential direction And a third curved portion convex in the axial direction and a fourth curved portion concave in the axial direction, the first curved portion being connected to the third curved portion and the fourth curved portion, respectively, and the second curved portion being the third curved portion and A plurality of cells connected to the fourth curved portion and spaced apart in a line in the circumferential direction; A ring-shaped stent ring comprising a plurality of first links having a first curved portion and a second curved portion of two adjacent ones of the plurality of cells, the fifth curved portion being axially convex; The point where the first curved portion and the second curved portion meet the plurality of first links is characterized by consisting of a point away from the central axis of the first curved portion and the second curved portion.
본 발명에 따른 외과용 스텐트를 사용하면 팽창 시에 축방향으로의 수축이 최소화되어 정확한 위치에 스텐트를 위치시킬 수 있는 효과가 있다. 또한, 시술 후 강한 지지력을 보유하여 혈관 등의 재협착을 방지할 수 있는 효과가 있다. Using the surgical stent according to the present invention has the effect of minimizing the contraction in the axial direction when inflated to position the stent in the correct position. In addition, there is an effect that can hold a strong support force after the procedure to prevent restenosis of blood vessels and the like.
도 1은 본 발명에 따른 외과용 스텐트의 구성을 나타낸 사시도이다.1 is a perspective view showing the configuration of a surgical stent in accordance with the present invention.
도 2는 도 1의 스텐트의 전개도이다.2 is an exploded view of the stent of FIG. 1.
도 3은 본 발명에 따른 외과용 스텐트가 수축되었을 때의 전개도이다.3 is a development view when the surgical stent in accordance with the present invention is contracted.
도 4는 본 발명에 따른 외과용 스텐트가 팽창되었을 때의 전개도이다.4 is an exploded view when the surgical stent according to the present invention is inflated.
도 5는 본 발명에 따른 외과용 스텐트에서 셀의 꼭지점에 팽창에 따른 힘이 작용할 때의 변형 전과 변형 후를 비교한 도면이다.5 is a view comparing before and after deformation when the force according to the expansion is applied to the vertices of the cell in the surgical stent according to the present invention.
도 6은 본 발명에 따른 외과용 스텐트에서 셀의 편심된 지점에 팽창된 힘이 작용할 때의 변형 전과 변형 후를 비교한 도면이다.6 is a view comparing before and after deformation when the expanded force is applied to the eccentric point of the cell in the surgical stent according to the present invention.
도 7은 본 발명에 따른 다른 실시예의 외과용 스텐트의 구성을 나타낸 사시도이다.Figure 7 is a perspective view showing the configuration of a surgical stent of another embodiment according to the present invention.
도 8은 도 7의 스텐트의 전개도이다.8 is an exploded view of the stent of FIG. 7.
본 발명의 그 밖의 목적, 특정한 장점들과 신규한 특징들은 첨부된 도면들과 연관되어지는 이하의 상세한 설명과 바람직한 실시예들로부터 더욱 분명해질 것이다.Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments associated with the accompanying drawings.
이하, 본 발명에 따른 외과용 스텐트에 대한 바람직한 실시예들을 첨부된 도면들에 의거하여 상세하게 설명한다.Hereinafter, preferred embodiments of the surgical stent according to the present invention will be described in detail with reference to the accompanying drawings.
본 명세서에서 '축방향'은 도면에 도시된 화살표 i의 방향을 의미하며, '반경방향'은 도면에 도시된 화살표 j의 방향을 의미하며, '원주방향'은 도면에 도시된 화살표 k의 방향을 의미한다. '오목'은 화살표 i, j, k가 가리키는 방향으로 갈수록 패인 곡선 형태를 의미한다. '볼록'은 화살표 i, j, k가 가리키는 방향으로 갈수록 튀어나온 곡선의 형태를 의미한다.In the present specification, the 'axial direction' refers to the direction of the arrow i shown in the drawing, the 'radial direction' refers to the direction of the arrow j shown in the drawing, and the 'circumferential direction' refers to the direction of the arrow k shown in the drawing. Means. 'Concave' refers to a curved line that goes in the direction indicated by arrows i, j, and k. 'Convex' means the shape of the curve protruding toward the direction indicated by the arrows i, j, k.
도 1과 도 2를 참조하면, 본 발명에 따른 외과용 스텐트는 축방향으로 일렬로 이격되어 배열되는 다수의 스텐트링(Stent ring: 10)들을 구비한다. 스텐트링(10)들은 다수의 셀(Cell: 11)들과, 다수의 셀(11)들 중 인접하는 두 개의 셀(11)들을 원주방향으로 연결하는 다수의 제1 링크(Link: 20)들로 구성된다. 1 and 2, the surgical stent according to the present invention includes a plurality of stent rings 10 arranged in a row in the axial direction. The stent rings 10 may include a plurality of cells 11 and a plurality of first links 20 that circumferentially connect two adjacent cells 11 of the plurality of cells 11. It consists of.
셀(11)들은 변형된 트러스 형상을 하고 있다. 셀(11)들은 원주 방향으로 볼록한 제1 곡선부(12)와, 원주 방향으로 오목한 제2 곡선부(13)와, 축방향으로 볼록한 제3 곡선부(14)와, 축방향으로 오목한 제4 곡선부(15)로 이루어진다. 제1 곡선부(12)는 제3 곡선부(14) 및 제4 곡선부(15)와 각각 변곡점(16)을 형성하면서 연결된다. 제2 곡선부(13)는 제3 곡선부(14) 및 제4 곡선부(15)와 각각 변곡점(16)을 형성하면서 연결된다. 이에 따라 셀(11)들은 그 내부에 폐곡면을 형성하게 된다. 제1 곡선부(12)와 제2 곡선부(13)는 서로 대칭이고, 제3 곡선부(14)와 제4 곡선부(15)도 서로 대칭인 것이 바람직하다. 제1 곡선부(12)와 제2 곡선부(13)가 제3 곡선부(14)와 제4 곡선부(15)보다 더 큰 형태가 안정적이다.The cells 11 have a deformed truss shape. The cells 11 have a first curved portion 12 convex in the circumferential direction, a second curved portion 13 concave in the circumferential direction, a third curved portion 14 convex in the axial direction, and a fourth concave in the axial direction. It consists of a curved portion 15. The first curved portion 12 is connected to the third curved portion 14 and the fourth curved portion 15 to form an inflection point 16, respectively. The second curved portion 13 is connected to the third curved portion 14 and the fourth curved portion 15 to form an inflection point 16, respectively. Accordingly, the cells 11 form a closed curved surface therein. It is preferable that the first curved portion 12 and the second curved portion 13 are symmetrical with each other, and the third curved portion 14 and the fourth curved portion 15 are also symmetrical with each other. The larger shape of the first curved portion 12 and the second curved portion 13 than the third curved portion 14 and the fourth curved portion 15 is stable.
셀(11)들은 원주 방향으로 일렬로 이격되어 배치되며, 각 셀(11)들은 제1 링크(20)들로 연결된다. 제1 링크(20)들은 축방향으로 볼록한 제5 곡선부(21)를 가지며, 인접하는 두 개의 셀(11)들의 제1 곡선부(12)와 제2 곡선부(13)를 연결한다. 제1 곡선부(12)와 제2 곡선부(13)와 만나는 지점(22)은 제1 곡선부(12)와 제2 곡선부(13)의 꼭지점을 벗어난 지점에 편심되어 위치함이 바람직하다.The cells 11 are arranged spaced apart in a line in the circumferential direction, and each cell 11 is connected to the first links 20. The first links 20 have a fifth curved portion 21 that is axially convex and connects the first curved portion 12 and the second curved portion 13 of two adjacent cells 11. The point 22 where the first curved portion 12 and the second curved portion 13 meet is preferably eccentrically positioned at a point beyond the vertices of the first curved portion 12 and the second curved portion 13. .
도 5와 도 6을 참조하여 제1 링크(20)들와 셀(11)들의 연결지점(22)이 꼭지점과 편심되는 경우의 장점을 설명한다. 도 5는 제1 곡선부(12)와 제2 곡선부(13)의 꼭지점에 팽창에 따른 힘이 작용할 때의 변형 전과 변형 후를 비교한 것이고, 도 6은 편심된 지점에 팽창된 힘이 작용할 때의 변형 전과 변형 후를 비교한 것이다. 참고로, 도 5의 경우, 제4 곡선부(15)의 이동량은 미소하여, 제3 곡선부(14)의 이동량에 더하여 도시하였다.5 and 6, the advantages of the case where the connection points 22 of the first links 20 and the cells 11 are eccentric with the vertices will be described. FIG. 5 compares before and after deformation when a force due to expansion is applied to the vertices of the first curved portion 12 and the second curved portion 13, and FIG. 6 shows the expanded force acting on the eccentric point. This is a comparison between before and after deformation. For reference, in the case of FIG. 5, the amount of movement of the fourth curved portion 15 is small and is shown in addition to the amount of movement of the third curved portion 14.
도 5를 참조하면, 팽창 시 제1 곡선부(12)와 제2 곡선부(13)의 꼭지점에 원주방향의 힘이 작용하면, 좌우 대칭의 형상적 특징으로 인해 제3 곡선부(14)와 제4 곡선부(15)의 꼭지점이 내측으로 동일한 비율로 이동하게 된다. 이에 비하여, 도 6을 참조하면, 편심된 지점에 원주방향의 동일한 힘이 작용하면, 꼭지점의 중심축이 변형 전에 비해 힘의 작용점을 향하여 이동하면서 제3 곡선부(14)의 꼭지점이 내측으로 이동하려는 것을 최소화한다. Referring to FIG. 5, when a circumferential force acts on the vertices of the first curved portion 12 and the second curved portion 13 during expansion, the third curved portion 14 and The vertices of the fourth curved portion 15 are moved inward at the same ratio. In contrast, referring to FIG. 6, when the same circumferential force acts on the eccentric point, the vertex of the third curved portion 14 moves inward while the center axis of the vertex moves toward the point of action of the force as compared to before deformation. Minimize what you want to do.
도 5와 같은 경우에는 힘의 작용으로 인한 변형이 제1 곡선부(12)와 제2 곡선부(13)의 꼭지점에서는 크게 일어나지 않는다. 도 6과 같은 경우에는 변형이 꼭지점을 이동시키면서 그 부근에서도 동시에 일어나므로, 제3 곡선부(14)와 제4 곡선부(15)의 꼭지점 사이의 거리가 줄어드는 양을 최소화할 수 있다. 즉, d1 이 d2 보다 작은 것을 도 5와 도 6에서 알 수 있다.In the case of FIG. 5, deformation due to the action of the force does not occur significantly at the vertices of the first curved portion 12 and the second curved portion 13. In the case of FIG. 6, since the deformation occurs at the same time while moving the vertex, the distance between the vertices of the third curved portion 14 and the fourth curved portion 15 can be minimized. That is, it can be seen from FIGS. 5 and 6 that d 1 is smaller than d 2 .
또한, 편심되어 있음으로 해서, 도 5와 같이 꼭지점에서 제1 링크(20)들이 연결되는 것에 비해 제1 링크(20)들의 길이를 증가시킬 수 있는 공간, 즉 제1 링크(20)들이 셀(11)들과 연결되는 지점 사이의 거리가 길어져서, 시술시 스텐트를 확장할 때 더 큰 비율로 확장을 할 수 있다. 다시 말하면, 스텐트를 일정 비율로 팽창시킨다고 가정했을 때, 본 발명과 같이 편심된 결합구조를 가진 셀(11)들에 가해지는 힘이 도 5와 같은 결합구조를 가진 셀에 비해 더 작다는 것을 의미한다.In addition, due to the eccentricity, a space capable of increasing the length of the first links 20, that is, the first links 20 are formed in the cell ( 11) The distance between the points and the connection is long, so that the expansion of the stent during the procedure can be expanded at a larger rate. In other words, assuming that the stent is inflated at a constant rate, the force applied to the cells 11 having the eccentric coupling structure as shown in the present invention is smaller than that of the cell having the coupling structure as shown in FIG. 5. do.
이와 같이 셀(11)들의 변형, 특히 제3 곡선부(14)와 제4 곡선부(15)의 꼭지점 간의 거리의 변형을 최소화하면서, 팽창 시에는 도 4와 같이 제1 링크(20)들 만이 변형된다. 수축된 채로 혈관을 따라 삽입할 때에는 도 3과 같이 제1 링크(20)들이 거의 접혀있다가, 원하는 위치에 스텐트를 위치시킨 후에는 팽창시켜 제1 링크(20)들을 도 4와 같이 변형시킨다.In this way, while minimizing the deformation of the cells 11, particularly the distance between the vertices of the third curved portion 14 and the fourth curved portion 15, only the first links 20 as shown in FIG. Is deformed. When inserted along the vessel while contracted, the first links 20 are almost folded as shown in FIG. 3, and after the stent is positioned at a desired position, the first links 20 are expanded to deform the first links 20 as shown in FIG. 4.
도 1과 도 2에 도시되어 있는 바와 같이, 본 발명에 따른 외과용 스텐트는 스텐트링(10)들을 축방향으로 연결하는 다수의 제2 링크(30)들을 구비한다. 제2 링크(30)들은 두 개의 꼭지점(31)들을 가진 곡선 형상을 가지며, 인접하는 두 개의 셀(11)들의 제3 곡선부(14)와 제4 곡선부(15)를 연결한다. 제2 링크(30)들은 스텐트가 휘어진 혈관 등에 장착될 경우 휘어짐을 수용할 수 있어야 하며, 팽창되어 고정되었을 때 지지력을 확보할 수 있는 구조로 이루어져 있다. 이러한 구조는 두 개의 꼭지점(31)들을 가진 곡선 형상으로 구현되며, 이는 셀(11)들의 변형을 수용하면서도 혈관 내벽이 스텐트 내부로 침범하는 것을 막기 위해 넓은 범위에서 혈관 내벽을 받쳐주는 역할도 수행하게 된다.As shown in FIGS. 1 and 2, a surgical stent in accordance with the present invention has a plurality of second links 30 that axially connect the stent rings 10. The second links 30 have a curved shape having two vertices 31 and connect the third curved portion 14 and the fourth curved portion 15 of two adjacent cells 11. The second link 30 should be able to accommodate the bending when the stent is mounted to the curved blood vessel, etc., and has a structure that can secure the supporting force when the stent is expanded and fixed. This structure is embodied in a curved shape with two vertices 31, which accommodates the deformation of the cells 11 and also serves to support the vessel wall in a wide range to prevent the vessel wall from invading into the stent. do.
한편, 제2 링크(30)들은 꼭지점(31)들의 개수를 두 개로 한정할 필요는 없다. 즉, 혈관의 휘어짐이 많은 구간에 시술되는 경우에는 세 개 이상의 꼭지점(31)들을 가지는 스텐트를 사용할 수 있고, 직선 구간에는 한 개의 꼭지점(31)을 가지는 스텐트를 사용할 수 있다. 보통의 경우, 본 실시예와 같이 두 개의 꼭지점(31)들을 가지는 제2 링크(30)들이 사용되는 것이 안정적이다.On the other hand, the second links 30 need not limit the number of vertices 31 to two. That is, when the vessel is bent in many sections, a stent having three or more vertices 31 may be used, and a stent having one vertex 31 may be used in a straight section. Normally, it is stable for the second links 30 having two vertices 31 to be used as in this embodiment.
도 7과 도 8에 본 발명에 따른 다른 실시예의 외과용 스텐트가 도시되어 있다. 도 7과 도 8을 참조하면, 본 발명에 따른 다른 실시예의 외과용 스텐트는 기본적으로 도 1과 도 2에 도시된 실시예와 같은 구성을 가지며, 제3 곡선부(14)와 제4 곡선부(15)를 잇는 스트럿(Strut: 17)을 추가적으로 구비한다. 이러한 스트럿(17)은 팽창 시 발생하는 셀(11)들의 변형을 최소화하여 축방향의 수축을 방지할 수 있다. 본 발명에 따른 다른 실시예의 외과용 스텐트의 구성은 앞에서 설명한 본 발명에 따른외과용 스텐트의 구성과 동일하므로, 그 구성 및 작용에 대한 자세한 설명은 생략한다.7 and 8 show another embodiment of a surgical stent in accordance with the present invention. 7 and 8, the surgical stent of another embodiment according to the present invention basically has the same configuration as the embodiment shown in Figures 1 and 2, the third curved portion 14 and the fourth curved portion An additional strut 17 is provided. This strut 17 can prevent the axial contraction by minimizing the deformation of the cells 11 that occur during expansion. Since the configuration of the surgical stent according to another embodiment of the present invention is the same as the configuration of the surgical stent according to the present invention described above, a detailed description of the configuration and operation will be omitted.
한편, 상술한 셀(11)들과 제1 링크(20)들와 제2 링크(30)들은 모두 가요성의 금속 재질로 이루어진다. 이러한 재질은 통상의 스텐트에 사용하는 것과 같이 사용하면 된다. 또한, 혈전용해제 등의 약물을 추가적으로 시술하기 위해 셀(11)들과 제1 링크(20)들와 제2 링크(30)들의 표면에 나노 미세 공정을 하여 약물을 수용할 수 있는 공간을 형성함이 바람직하다.Meanwhile, the cells 11, the first links 20, and the second links 30 are all made of a flexible metal material. Such materials may be used as used for ordinary stents. In addition, nano-processing is formed on the surfaces of the cells 11, the first links 20, and the second links 30 in order to additionally treat drugs such as thrombolytics, thereby forming a space for accommodating drugs. desirable.
또한, 스텐트의 가시성을 향상시키기 위하여, 스텐트의 단부에 형성되는 셀(11)들은 환자의 몸체 관강 내에서 스텐트의 이식을 실시하는 동안 또는 그 후에 의료적인 이미징 장치를 통하여 단부가 분명히 보여질 수 있도록 하는 금, 은, 플라티늄 등과 같은 방사의 불투명한 재료(Radio-opaque material)로 형성되는 것이 바람직하다. 상술한 바와 같은 스텐트를 사용하면 팽창 시에 축방향으로의 수축을 최소화할 수 있어, 정확한 위치에 스텐트를 위치시킬 수 있는 장점이 있다.In addition, in order to improve the visibility of the stent, the cells 11 formed at the end of the stent may be clearly visible through the medical imaging device during or after implantation of the stent in the body lumen of the patient. It is preferable to be formed of a radio-opaque material such as gold, silver, platinum, and the like. Using the stent as described above can minimize the contraction in the axial direction when inflated, there is an advantage that can be placed in the correct position.
이상에서 설명된 실시예는 본 발명의 바람직한 실시예를 설명한 것에 불과하고, 본 발명의 권리범위는 설명된 실시예에 한정되는 것은 아니며, 본 발명의 기술적 사상과 특허청구범위 내에서 이 분야의 당업자에 의하여 다양한 변경, 변형 또는 치환이 가능할 것이며, 그와 같은 실시예들은 본 발명의 범위에 속하는 것으로 이해되어야 한다.The embodiments described above are merely illustrative of the preferred embodiments of the present invention, the scope of the present invention is not limited to the described embodiments, those skilled in the art within the spirit and claims of the present invention It will be understood that various changes, modifications, or substitutions may be made thereto, and such embodiments are to be understood as being within the scope of the invention.

Claims (6)

  1. 팽창 이전과 이후에 원통의 형상을 이루는 외과용 스텐트에 있어서,In a surgical stent that forms a cylindrical shape before and after expansion,
    원주 방향으로 볼록한 제1 곡선부와, 원주 방향으로 오목한 제2 곡선부와, 축방향으로 볼록한 제3 곡선부와, 축방향으로 오목한 제4 곡선부를 포함하며, 상기 제1 곡선부는 상기 제3 곡선부 및 상기 제4 곡선부와 각각 연결되고, 상기 제2 곡선부는 상기 제3 곡선부 및 상기 제4 곡선부와 각각 연결되며, 원주 방향으로 일렬로 이격되어 배치되는 다수의 셀들과; A first curved portion convex in the circumferential direction, a second curved portion concave in the circumferential direction, a third curved portion convex in the axial direction, and a fourth curved portion concave in the axial direction, the first curved portion being the third curve A plurality of cells each connected to a portion and the fourth curved portion, wherein the second curved portion is connected to the third curved portion and the fourth curved portion, and spaced apart in a line in the circumferential direction;
    상기 다수의 셀들 중 인접하는 두 개의 셀들의 상기 제1 곡선부와 상기 제2 곡선부를 연결하며, 축방향으로 볼록한 제5 곡선부를 가지는 다수의 제1 링크들로 구성되는 링형상의 스텐트링을 포함하며,A ring-shaped stent ring connecting the first curved portion and the second curved portion of two adjacent cells of the plurality of cells, the ring-shaped stent ring having a plurality of first links having a fifth curved portion axially convex; ,
    상기 제1 곡선부와 상기 제2 곡선부가 상기 다수의 제1 링크들과 만나는 지점은 상기 제1 곡선부와 상기 제2 곡선부의 중심축에서 벗어난 지점으로 이루어지는 외과용 스텐트.And wherein the point where the first curved portion and the second curved portion meet the plurality of first links is a point off the central axis of the first curved portion and the second curved portion.
  2. 제1 항에 있어서, 상기 다수의 셀들의 내부에 폐곡면이 형성되도록 상기 제1 곡선부는 상기 제3 곡선부 및 상기 제4 곡선부와 각각 변곡점을 형성하면서 연결되고, 상기 제2 곡선부는 상기 제3 곡선부 및 상기 제4 곡선부와 각각 변곡점을 형성하면서 연결되는 외과용 스텐트.The method of claim 1, wherein the first curved portion is connected to the third curved portion and the fourth curved portion to form an inflection point so that a closed curved surface is formed in the plurality of cells, and the second curved portion is connected to the second curved portion. A surgical stent connected to each of the three curved portions and the fourth curved portion while forming an inflection point.
  3. 제2 항에 있어서, 상기 스텐트링은 축방향으로 다수가 이격되어 배열되며, 상기 인접하는 두 개의 셀들의 상기 제3 곡선부와 상기 제4 곡선부를 연결하는 다수의 제2 링크들을 더 포함하고, 상기 다수의 제2 링크들은 다수의 꼭지점들을 가지며 곡선 형상을 갖는 외과용 스텐트.The stent ring of claim 2, wherein the stent ring is arranged in a plurality spaced apart in the axial direction, and further includes a plurality of second links connecting the third curved portion and the fourth curved portion of the two adjacent cells. And the plurality of second links has a plurality of vertices and has a curved shape.
  4. 제3 항에 있어서, 상기 제1 곡선부와 상기 제2 곡선부는 서로 대칭이고, 상기 제3 곡선부와 상기 제4 곡선부는 서로 대칭이며, 상기 제5 곡선부는 중심축을 기준으로 대칭인 형상을 갖는 외과용 스텐트.4. The method of claim 3, wherein the first curved portion and the second curved portion are symmetrical with each other, the third curved portion and the fourth curved portion are symmetrical with each other, and the fifth curved portion has a shape symmetrical with respect to a central axis. Surgical stents.
  5. 제4 항에 있어서, 상기 다수의 제2 링크들은 두 개의 꼭지점들을 갖는 외과용 스텐트.The surgical stent of claim 4, wherein the plurality of second links have two vertices.
  6. 제1 항에 있어서, 상기 다수의 셀들은 상기 제3 곡선부와 상기 제4 곡선부를 연결하는 스트럿을 더 포함하는 외과용 스텐트.The surgical stent of claim 1, wherein the plurality of cells further comprises a strut connecting the third curved portion and the fourth curved portion.
PCT/KR2011/002752 2010-04-23 2011-04-18 Surgical stent WO2011132897A2 (en)

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