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KR100678435B1 - Tubular stents for vascular wall shielding - Google Patents

Tubular stents for vascular wall shielding Download PDF

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KR100678435B1
KR100678435B1 KR1020050030754A KR20050030754A KR100678435B1 KR 100678435 B1 KR100678435 B1 KR 100678435B1 KR 1020050030754 A KR1020050030754 A KR 1020050030754A KR 20050030754 A KR20050030754 A KR 20050030754A KR 100678435 B1 KR100678435 B1 KR 100678435B1
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stent
polymer
blood vessel
tube
present
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KR20060108401A (en
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강성권
성 현 김
건 나
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주식회사 에스앤지바이오텍
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/04Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
    • A61F2/06Blood vessels
    • A61F2/07Stent-grafts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90Stents 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
    • A61F2/91Stents 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 sheets or tubes, e.g. perforated by laser cuts or etched holes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/14Macromolecular materials
    • A61L27/18Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/14Macromolecular materials
    • A61L27/20Polysaccharides

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biomedical Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Cardiology (AREA)
  • Vascular Medicine (AREA)
  • Dermatology (AREA)
  • Medicinal Chemistry (AREA)
  • Epidemiology (AREA)
  • Pulmonology (AREA)
  • Gastroenterology & Hepatology (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

본 발명은 혈관 벽 차폐용 튜브형 스텐트에 관한 것으로서, 내부에 중공부(1c)를 갖는 원통상의 고분자 튜브(1a)와 상기 고분자 튜브의 표면상에 형성되어 있는 접착성 고분자의 코팅층(1b)으로 구성되어 2층구조를 갖는 것을 특징으로 한다.The present invention relates to a tubular stent for shielding blood vessel walls, comprising a cylindrical polymer tube (1a) having a hollow portion (1c) therein and a coating layer (1b) of an adhesive polymer formed on the surface of the polymer tube. It is characterized by having a two-layer structure.

본 발명은 유연성이 뛰어나고 직경이 작아서 뇌동맥등과 같이 가늘고 곡선인 혈관 속에도 용이하게 삽입될 수 있고, 혈관 벽에 단단하게 접착, 고정 되는 장점이 있다.The present invention is excellent in flexibility and small in diameter, so that it can be easily inserted into thin and curved blood vessels, such as cerebral arteries, and has the advantage of being firmly adhered and fixed to the blood vessel wall.

스텐트, 튜브용, 혈관, 벽, 차폐용, 고분자, 접착성, 2층구조 Stent, tube, blood vessel, wall, shielding, polymer, adhesive, two layer structure

Description

혈관 벽 차폐용 튜브형 스텐트 {Tube type stent of covering wall of blood vessel}Tube type stent for covering blood vessel wall {Tube type stent of covering wall of blood vessel}

도1은 본 발명의 사시도.1 is a perspective view of the present invention.

도2는 본 발명의 단면도.2 is a cross-sectional view of the present invention.

도3은 본 발명의 사용 상태를 나타내는 개략도.3 is a schematic diagram showing a use state of the present invention;

*도면중 주요부분에 대한 부호 설명* Explanation of symbols on the main parts of the drawings

1: 튜브형 스텐트 1a: 고분자 튜브1: tubular stent 1a: polymer tube

1b: 접착성 고분자의 코팅층 1c: 중공부1b: coating layer of adhesive polymer 1c: hollow part

2: 혈관 3: 가성 동맥류2: blood vessel 3: pseudo aneurysm

본 발명은 혈관 벽 차폐용 튜브형 스텐트에 관한 것으로서, 보다 구체적으로는 뇌동맥과 같이 가늘고 굽은 굴곡부를 갖는 혈관내에 삽입되어 뚫어진 혈관 벽을 효과적으로 막아 줄 수 있는 튜브형 스텐트에 관한 것이다.The present invention relates to a tubular stent for shielding blood vessel walls, and more particularly, to a tubular stent that can effectively block a vascular wall inserted and inserted into a blood vessel having a thin curved bend such as a cerebral artery.

내강용 스텐트는 혈관 또는 식도등의 내강이 협착된 경우 이를 확장해 주기 위해 사용되는 내강 확장용 스텐트와 혈관 벽의 손상부위를 막아주기 위해 사용되는 차폐용 스텐트(Covered stent)로 크게 대별된다.The lumen stent is largely divided into a lumen dilation stent used to expand the luminal stenosis such as blood vessels or esophagus and a covered stent used to prevent damage to the vessel wall.

종래의 스텐트로는 대체적으로 전체적인 형상이 원통형 구조체를 이루고, 자체가 탄성력을 가지고 있어 외력을 가하여 수축시킬 수 있고 이 외력을 제거하면 자체 팽창할 수 있도록 금속 필라멘트를 메쉬 형태로 교차시켜 제조한 자체 팽창성 스텐트가 주로 사용되어 왔다.Conventional stents generally have a cylindrical structure, the overall shape of which is self-expandable, self-expansible, made by crossing the metal filament in the form of a mesh so that it can be expanded by applying an external force, and when the external force is removed Stents have been used primarily.

상기한 자체 팽창형 스텐트는 여러가지 특성 즉, 내강을 팽창시켜 주기 위한 팽창성과, 내강의 굽어진 부위에서 내강의 굽어진 모양을 그대로 유지하면서 유연하게 적응할 수 있는 유연성과, 일정한 직경으로 축소되기 위한 축소성 등을 보유해야 스텐트로서의 기능을 제대로 발휘할 수 있게 되는 것이다.The self-expandable stent has various characteristics, that is, expandability to expand the lumen, flexibility to adapt flexibly while maintaining the curved shape of the lumen at the bent portion of the lumen, and shrinkage to be reduced to a constant diameter. It is necessary to have sex to be able to properly function as a stent.

상기한 스텐트의 특성중 팽창성이 부족하면 내강의 최초 삽입된 위치로부터 쉽게 이동하게 되고, 유연성이 부족하면 스텐트가 내강의 굽어진 부위에서 팽창할 때 내강의 굽어진 부위에서 적응성이 떨어지게 되며, 축소성이 부족하면 스텐트를 삽입하기 위한 삽입장치의 크기가 커지게 되는 것이다.If the stent lacks the expandability of the characteristics of the stent, it is easy to move from the initial insertion position of the lumen, if the lack of flexibility, when the stent expands in the bent portion of the lumen, it is inadequate in the bent portion of the lumen, shrinkage If this is insufficient, the size of the inserting device for inserting the stent will increase.

따라서 상기한 기능을 갖는 스텐트가 다수 개발되어 왔으며, 이러한 스텐트는 크게 나선형 스텐트와 지그재그형 스탠트로 나눌 수 있다.Therefore, a number of stents having the above functions have been developed, and these stents can be largely divided into spiral stents and zigzag stents.

상기한 나선형 스텐트중 대표적인 것으로는, 단위 길이를 갖는 금속 필라멘트를 원통형 벽면을 따라 나선상으로 감아주고 다시 지그재그 형태로 양끝단을 왕복함과 아울러 서로 교차하여 메쉬를 만들어 전체적으로 원통형상을 갖게 된다. 이러한 나선형 스텐트는 작은 직경으로 축소될 수 있어 유연성이 우수한 반면 이 유 연성으로 인하여 팽창성이 크게 떨어지게 되는 단점이 있다.Representative of the spiral stent, a metal filament having a unit length spirally wound along a cylindrical wall and reciprocating both ends in a zigzag form again and intersecting with each other to form a mesh to have an overall cylindrical shape. Such a spiral stent can be reduced to a small diameter, which is excellent in flexibility, but has a disadvantage in that expandability is greatly reduced due to this flexibility.

한편, 대한민국 공개특허 제 1998-67399호 등에서는, 필라멘트를 다수의 직선부와 다수의 밴딩 포인트에 의하여 이 직선부를 연결하는 피크부 및 밸리부를 이루도록 지그재그로 다수의 턴을 행하며, 상기한 어느 일턴의 밸리부는 이 일턴과 이웃하는 턴의 대응하는 피크부를 서로 꼬아서 연결하여 이루어진 스텐트를 제시하고 있다.On the other hand, the Republic of Korea Patent Publication No. 1998-67399 and the like, a plurality of turns in a zigzag to form a peak portion and a valley portion connecting the filament by a plurality of straight portions and a plurality of bending points, and the one-turn of The valley presents a stent formed by twisting the corresponding peaks of this one turn and neighboring turns together.

그러나, 상기 종래의 스텐트는 좁아진 내강을 확장시키는 팽창성이 우수한 반면 유연성이 떨어질 뿐만아니라 작은 크기로 축소하기 곤란하며, 내강의 굽어진 부위에서 굽어진 모양을 그대로 유지하지 못하게 되는 단점이 있다.However, the conventional stent is excellent in expandability to expand the narrowed lumen, but also inferior in flexibility, it is difficult to shrink to a small size, there is a disadvantage that does not maintain the bent shape in the bent portion of the lumen.

이상에서 살펴본 바와 같이 금속 필라멘트를 메쉬형태로 교차시켜 제조한 종래의 자체 팽창성 스텐트는 금속 필라멘트 고유의 딱딱한 성질(Rigid property)에 기인하여 유연성과 축소성 향상에는 한계가 있었다.As described above, the conventional self-expandable stent manufactured by crossing metal filaments in a mesh form has limitations in improving flexibility and shrinkage due to rigid properties of metal filaments.

그로인해, 금속메쉬로 구성된 종래의 스텐트는 뇌동맥 등과 같이 직경이 가늘고 굽은 곡선부가 많은 혈관 속으로는 삽입이 불가능 하여 적용할 수 없는 문제점이 있었다.Therefore, the conventional stent composed of a metal mesh has a problem in that it cannot be inserted into a blood vessel having a large diameter and curved curved portion, such as a cerebral artery, and thus cannot be applied.

본 발명의 목적은 이와 같은 종래의 문제점들을 해소하기 위해서 직경이 작고 곡선부가 많은 혈관 벽의 손상부위를 효과적으로 차폐할 수 있는 튜브형 스텐트를 제공하기 위한 것이다.It is an object of the present invention to provide a tubular stent that can effectively shield damaged areas of blood vessel walls with a small diameter and many curved portions in order to solve such conventional problems.

본 발명은 금속 필라멘트 메쉬 대신에 고분자(폴리머)로 제조되어 유연성이 뛰어나고 직경도 4mm 이하로 작은 튜브형 스텐트를 제공하고자 한다.The present invention is made of a polymer (polymer) instead of a metal filament mesh to provide a tubular stent having excellent flexibility and small diameter of less than 4mm.

또한 본 발명은 스텐트의 자체 확장성을 이용하는 대신에 스텐트의 표면에 형성된 접착성 고분자의 코팅층을 이용하여 튜브형 스텐트를 혈관내에 고정시키는 튜브형 스텐트를 제공하고자 한다.In another aspect, the present invention is to provide a tubular stent for fixing the tubular stent in the blood vessel using a coating layer of the adhesive polymer formed on the surface of the stent instead of using the self-expansion of the stent.

이와 같은 과제들을 달성하기 위한 본 발명의 혈관 벽 차폐용 튜브형 스텐트는, 내부에 중공부(1c)를 갖는 원통상의 고분자 튜브(1a)와 상기 고분자 튜브의 표면상에 형성되어 있는 접착성 고분자의 코팅층(1b)으로 구성되어 2층구조를 갖는 것을 특징으로 한다.In order to achieve the above problems, the tube-shaped stent for shielding blood vessel walls of the present invention includes a cylindrical polymer tube 1a having a hollow portion 1c therein and an adhesive polymer formed on the surface of the polymer tube. It is characterized by having a two-layer structure composed of a coating layer (1b).

이하, 첨부한 도면등을 통하여 본 발명을 상세하게 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

먼저, 본발명은 도1 및 도2와 같이 원통상의 고분자 튜브(1a) 상에 접착성 고분자가 코팅된 2층구조를 갖는다.First, the present invention has a two-layer structure coated with an adhesive polymer on the cylindrical polymer tube (1a) as shown in Figs.

도1은 본 발명의 사시도이고, 도2는 본 발명의 단면도 이다.1 is a perspective view of the present invention, Figure 2 is a cross-sectional view of the present invention.

상기 고분자 튜브(1a)는 내부에 중공부(1c)를 갖는 원통형태이다.The polymer tube 1a has a cylindrical shape having a hollow portion 1c therein.

고분자 튜브(1a)는 열가소성수지로 이루어지며, 보다 바람직하기로는 유연성이 뛰어난 실리콘계수지 및 폴리우레탄 수지로 이루어진 것이 좋다.The polymer tube 1a is made of a thermoplastic resin, and more preferably, made of a silicone resin and a polyurethane resin having excellent flexibility.

한편, 고분자 튜브(1a)의 표면상에 형성되어 있는 접착성 고분자의 코팅층 (1b)은 폴리사카라이드(Polysaccharides) 계열의 고분자. 폴리아크릴릭 액시드(Polyacrylic acid), 카보폴(Carbopol)등의 합성 고분자이다.On the other hand, the coating layer (1b) of the adhesive polymer formed on the surface of the polymer tube (1a) is a polysaccharide (Polysaccharides) -based polymer. It is a synthetic polymer such as polyacrylic acid (Polyacrylic acid), Carbopol (Carbopol).

특히 폴리사카라이드 계열의 고분자중 풀루란(Pullulan), 덱스트란(Dextran) 또는 하알루로닉 액시드(Hyaluronic acid)를 포함하는 합성 고분자는 분해산물이 혈액 및 생체에 안전한 글루코스로 되기 때문에 가는 혈관에도 혈전의 생성없이 사용이 가능하며 점착성도 뛰어나 상기의 접착성 고분자의 코팅층(1b) 소재로 보다 바람직하다.Particularly, synthetic polymers including pullulan, dextran, or hyaluronic acid among polysaccharide-based polymers are thin blood vessels because their degradation products are made into blood and biologically safe glucose. Edo can be used without generating a blood clot, and is excellent in adhesiveness, and thus is more preferable as a material of the coating layer 1b of the adhesive polymer.

본 발명에 따른 튜브형 스텐트의 최대 직경은 4mm 이하이다. 최대 직경이 4mm를 초과하면 뇌동맥등과 같이 가는 혈관 속에 삽입이 어렵게 된다.The maximum diameter of the tubular stent according to the invention is 4 mm or less. If the maximum diameter exceeds 4mm it is difficult to insert into the blood vessels, such as cerebral artery.

고분자 튜브(1a)의 표면상에 접착성 고분자의 코팅층(1b)을 형성하는 방법 중 일례를 살펴보면, 2중 관형 노즐의 내측 구멍으로 고분자 튜브(1a)를 통과시킴과 동시에 2중 관형 노즐의 외측 구멍으로 접착성 고분자 용액을 토출시켜주면 접착성 고분자 용액을 고분자 튜브(1a)의 외표면에 고르게 코팅 할 수 있다.Looking at one example of the method of forming the coating layer (1b) of the adhesive polymer on the surface of the polymer tube (1a), while passing through the polymer tube (1a) through the inner hole of the double-tubular nozzle, the outer side of the double-tubular nozzle When the adhesive polymer solution is discharged through the holes, the adhesive polymer solution may be evenly coated on the outer surface of the polymer tube 1a.

도3은 본 발명의 튜브형 스텐트를 사용하여 뇌동맥 벽의 손상부분을 차단하는 상태를 나타내는 개략도 이다.Figure 3 is a schematic diagram showing a state of blocking the damaged portion of the cerebral artery wall using the tubular stent of the present invention.

뇌동맥 벽이 손상되어 혈액이 외부로 흘러나가 가성 동맥류(3)를 형성한 경우에는 수술방법으로의 치료는 사실상 불가능하다.If the cerebral artery wall is damaged and blood flows outward to form a pseudoaneurysm 3, treatment with a surgical method is virtually impossible.

가성 동맥류(3)란 벽이 없이 혈관 밖으로 빠져나간 혈액이 혈전을 만들고 혈전속에 굳지 않은 피가 모여 있는 것을 말한다.Caustic aneurysm (3) refers to the blood that has passed out of the blood vessel without a wall to form a blood clot, and the blood is not solidified in the blood clot.

뇌동맥(1) 벽이 손상되어 가성 동맥류(3)가 형성된 경우에도 도3과 같이 본 발명의 튜브형 스텐트를 뇌동맥(1)내에 삽입, 고정하면 뇌동맥 벽의 손상 부위를 효과적으로 막을 수 있게 된다.Even in the case where the wall of the cerebral artery 1 is damaged and the pseudoaneurysm 3 is formed, the tubular stent of the present invention can be inserted and fixed in the cerebral artery 1 as shown in FIG. 3 to effectively prevent the damage site of the cerebral artery wall.

본 발명의 튜브형 스텐트는 금속 필라멘트의 메쉬 대신에 고분자로 제조되어 자체확장성이 없기 때문에 혈관내에 삽입, 설치시에는 카테터의 선단에 위치하는 풍선(Ballon)을 이용하여 혈관 벽과 접촉이 가능하도록 혈관내에서 확장 시켜준다.Since the tubular stent of the present invention is made of a polymer instead of a mesh of metal filament and does not have self-expansion, the tubular stent may be contacted with a blood vessel wall by using a balloon positioned at the tip of the catheter when inserted into the vessel. It extends within

풍선을 이용하여 혈관 벽과 접촉이 되도록 튜브형 스텐트를 확장 시켜 주면 접착성 고분자의 코팅층(1b)이 갖는 끈적끈적한 성질(접착성)에 의해 튜브형 스텐트가 혈관 벽에 견고하게 접착하게 된다.When the tubular stent is expanded to be in contact with the vessel wall by using a balloon, the tubular stent is firmly adhered to the vessel wall by the sticky property (adhesiveness) of the coating layer 1b of the adhesive polymer.

본 발명은 직경이 작고 유연성이 뛰어나 굴곡부가 많고 직경이 좁은 뇌동맥등과 같은 혈관 속에도 용이하게 삽입 될 수 있어서, 혈관 벽의 손상된 부분을 효과적으로 막아줄 수 있다.The present invention can be easily inserted into blood vessels such as small diameter, excellent flexibility, many bends and narrow diameter cerebral arteries, etc., thereby effectively preventing the damaged portion of the vessel wall.

Claims (4)

내부에 중공부(1c)를 갖는 원통상의 고분자 튜브(1a)와 상기 고분자 튜브의 표면상에 형성되어 있는 접착성 고분자의 코팅층(1b)으로 구성되어 2층구조를 갖고, 상기 접착성 고분자가 폴리사카라이드(Polysaccharides) 계열의 고분자, 폴리아크릴릭 액시드(Polyacrylic acid) 및 카보폴(Carbopol) 중에서 선택된 1종인 것을 특징으로 하는 혈관 벽 차폐용 튜브형 스텐트.A cylindrical polymer tube 1a having a hollow part 1c therein and a coating layer 1b of an adhesive polymer formed on the surface of the polymer tube have a two-layer structure, and the adhesive polymer A tubular stent for vascular wall shielding, characterized in that one of polysaccharides (Polysaccharides) -based polymer, polyacrylic acid (Polyacrylic acid) and Carbopol (Carbopol). 1항에 있어서, 2층구조의 스텐트 최대 직경이 4mm 이하인 것을 특징으로 하는 혈관 벽 차폐용 튜브형 스텐트.The tubular stent for vascular wall shielding according to claim 1, wherein the two-layered stent has a maximum diameter of 4 mm or less. 1항에 있어서,고분자 튜브가(1a)가 열가소성수지로 구성됨을 특징으로 하는 혈관 벽 차폐용 튜브형 스텐트.The tubular stent for vessel wall shielding according to claim 1, wherein the polymer tube (1a) is made of thermoplastic resin. 삭제delete
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JP2000135290A (en) 1998-10-26 2000-05-16 Medinol Ltd Stent with dilatable cover with balloon
JP2000210379A (en) 1998-12-31 2000-08-02 Ethicon Inc Device having radiation impermeable polymer coating and its production
EP1084721A2 (en) 1994-12-13 2001-03-21 Advanced Cardiovascular Systems, Inc. Polymer film for wrapping a stent structure
US20020103526A1 (en) 2000-12-15 2002-08-01 Tom Steinke Protective coating for stent
JP2004113441A (en) 2002-09-26 2004-04-15 Ube Ind Ltd Stent graft

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EP1084721A2 (en) 1994-12-13 2001-03-21 Advanced Cardiovascular Systems, Inc. Polymer film for wrapping a stent structure
JP2000135290A (en) 1998-10-26 2000-05-16 Medinol Ltd Stent with dilatable cover with balloon
JP2000210379A (en) 1998-12-31 2000-08-02 Ethicon Inc Device having radiation impermeable polymer coating and its production
US20020103526A1 (en) 2000-12-15 2002-08-01 Tom Steinke Protective coating for stent
JP2004113441A (en) 2002-09-26 2004-04-15 Ube Ind Ltd Stent graft

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