WO2004105853A1 - Tuteur cylindrique - Google Patents

Tuteur cylindrique Download PDF

Info

Publication number
WO2004105853A1
WO2004105853A1 PCT/KR2003/001078 KR0301078W WO2004105853A1 WO 2004105853 A1 WO2004105853 A1 WO 2004105853A1 KR 0301078 W KR0301078 W KR 0301078W WO 2004105853 A1 WO2004105853 A1 WO 2004105853A1
Authority
WO
WIPO (PCT)
Prior art keywords
turns
basic
stent
straight portions
portions
Prior art date
Application number
PCT/KR2003/001078
Other languages
English (en)
Inventor
Sung-Gwon Kang
Eun-Sang Kim
Original Assignee
S & G Biotech, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by S & G Biotech, Inc. filed Critical S & G Biotech, Inc.
Priority to PCT/KR2003/001078 priority Critical patent/WO2004105853A1/fr
Publication of WO2004105853A1 publication Critical patent/WO2004105853A1/fr

Links

Classifications

    • 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
    • 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
    • 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
    • A61F2002/044—Oesophagi or esophagi or gullets
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A61F2230/0054—V-shaped

Definitions

  • the present invention relates to a medical appliance for lumens, and particularly, to a self-expandable medical appliance (hereinafter, referring to a ⁇ stent') for expanding the lumens of a blood vessel or esophagus in case these are constricted. More particularly, the present invention relates to a stent which can be contracted to a minimum size, is superior in expansibility, is easily bent and is very superior in flexibility.
  • the lumens in a human body may be constricted by diseases occurring in the body and thus their functions are degraded, more seriously, disabled. Such situation arises, for example, when the esophagus is constricted due to esophageal cancer when the blood does not flow smoothly due to arteriosclerosis, or when a track for flowing bile produced from a liver is constricted.
  • Such a stent is widely used which has an overall shape of a cylindrical structural body, is self-elastic to thus be contracted by an external force, and is self-expanding when the external force is removed.
  • the above-mentioned self-expandable stent requires many properties, i.e., expansibility for expanding the lumen, flexibility for flexibly adapting itself while maintaining a bent shape of the lumen at a bent portion of the lumen, and contractibility for contracting into a predetermined diameter, in order to perform its functions properly.
  • the stent if it is short of expansibility, it is easily moved from a first stent section of the lumen ' , if it is short of flexibility, it is reduced in adaptability to a bent portion of the lumen when the stent expands from the bent portion of the lumen, and if it is short of contractibility, the size of an insertion device for inserting the stent is increased.
  • the conventional stents are mainly divided into spiral type stents and zigzag type stents.
  • the representative ones of the spiral type stents includes a stent which is formed in a cylindrical shape on the whole by spirally wrapping filaments having a unit length along a cylindrical wall face, reciprocating them between opposite ends in a zigzag pattern and crossing them each other, thereby producing a mesh.
  • the stent of this type is superior in flexibility because it can be contracted into a small diameter, while having a drawback that it is largely decreased in expansibility due to the flexibility.
  • Korean Patent Laid-Open No. 1998-67399 discloses a stent which is formed of a filament having a plurality of turns of a zigzag configuration consisting of a plurality of straight portions and a plurality of peak and valley portions connecting the straight portions by a plurality of bending portions, and wherein the valley portion of a certain turn of the stent is twisted and connected with the peak portion of an adjacent turn of the stent as shown in Figs. 7 and 8.
  • the conventional stents are superior in the expansibility for expanding the constricted lumen, they are disadvantageous in that they are poor in flexibility, are difficult to be contracted to a small size and cannot maintain a bent shape at a bent portion of the lumen as its.
  • a cylindrical stent being formed of a wire and having a longitudinal axis according to the present invention, comprising: a plurality of basic turns being arranged with no crossing points to each other at the same interval as the height (h) of the basic turns along the longitudinal direction of a cylindrical body, the basic turns (1) of a zigzag configuration consisting of a plurality of peak portions (lc) and a plurality of valley portions (lb) connected by straight portions (la) along the circumferential surface; and a plurality of connecting turns (2) connecting the plurality of basic turns each other by winding the straight portions (la)- of the overlapped basic turns in a mesh shape and being arranged at the same interval as the distance (d) of the straight .
  • Fig. 1 is a front perspective view of a stent according to the present invention
  • Fig. 2 is an enlarged view showing a unit cell of the stent according to the present invention.
  • Fig. 3 is an enlarged view showing a basic turn of the stent according to the present invention.
  • Figs. 4 to 6 are views for explaining a method for making a stent according to the present invention
  • Figs. 7 to 8 are views showing a connecting state of basic turns in a conventional stent.
  • Basic turn 2 connecting turn la: straight portion of basic turn lb: valley portion of basic turn lc: peak portion of basic turn d: distance between straight portions of basic turn h: height of basic turn H: interval between basic turns
  • first basic pin 12 second basic pin
  • the cylindrical stent of the invention includes a plurality of basic turns 1 which is made of a wire having a unit length and has a zigzag configuration, the wire having a plurality of bending points along the circumferential face.
  • the basic turns have a plurality of peak portions lc and a plurality of valley portions lb as shown in Fig. 3.
  • the peak portions lc and the valley portions lb are connected by straight portions la slanted to the left and right sides.
  • the basic turns 1 are arranged with no crossing points to each other at the same interval as the height (h) of the basic turns along the longitudinal direction of a cylindrical body.
  • the cylindrical stent of the present invention includes a plurality of connecting turns 2 which connects the plurality of basic turns by winding the straight portions la of the overlapped basic turns in a coil shape, the basic turns being overlapped with the connecting turns as the connecting turns are arranged in a diagonal directions to the left and right sides of the basic turns.
  • the connecting turns 2 are arranged at the same interval as the distance (d) between the straight portions la of the basic turns.
  • the stent of the invention forms a unit cell as shown in Fig. 2.
  • the unit cell of Fig. 2 has the connecting turns 2 for wrapping the basic turns 1 arranged in an uncrossed state and connecting them in a mesh shape, to thus improve the flexibility of the stent greatly.
  • This can contract the stent to a smaller size, and the stent can keep its original shape even at a bent portion of a lumen, thereby allowing the flow of blood to be performed smoothly.
  • the connecting turns 2 are wound about the straight portions la of the overlapped basic turns in a coil shape, so the expansibility of the stent is also superior.
  • the number of times the connecting turns 2 are wound about the straight portions la of the basic turns is preferably 2 to 10.
  • the wire constituting the basic turns 1 and the connecting turns 2 is preferably made of a shape memory alloy such as nitinol.
  • a method for making a cylindrical stent of the present invention will now be described.
  • the wire is revolved once in a zigzag manner along a first basic pin 11 and a second basic pin 12 of a jig 10 for the manufacture of a stent to thus form a single basic turn 1.
  • a position spaced apart from the thus-formed basic turn in a downward direction of the jig 10 at the same interval as the height (h) of the basic turn another basic turn 1 is formed in the same manner.
  • a plurality of basic turns is formed which is arranged along the longitudinal direction of a cylindrical body without no crossing points to each other.
  • the interval between the connecting turns 2 is adjusted to be the same as the distance (d) between the straight portions of the basic turns, and the connecting turns 2 are wound around the straight portions la of the basic turns overlapped with the connecting turns 2.
  • the wire is positioned at the first basic pin 11 of the jig 10. At this time, if the wire is knotted, the thinning work of the stent is completed.
  • the knot of the connecting turns 2 serves as a fixing wire for fixing the stent into a lumen, and thus the manufacture and attachment of a fixing wire separately can be minimized.
  • the resulting stent is heated for 10 to 20 minutes in a heating oven set to 400 to 600°C along with the jig 10 for the manufacture of the stent, then is annealed for 30 minutes to 4 hours at a room temperature, then is separated from the jig 10, and then is finished, thereby completing the manufacture of the stent.
  • the present invention does not specially limit the condition of heating and annealing for the manufacture of the stent.
  • the cylindrical stent of the present invention is very superior in flexibility and expansibility since it has the connecting turns wrapping the basic turns and connecting them in a mesh shape. As a result, it can be contracted to a minimum size, keep its original shape at a bent portion of a lumen and is superior in adhesiveness to the bent portion of the lumen. Moreover, the present invention can minimize a number of fixing wires manufactured separately.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

La présente invention concerne un tuteur cylindrique constitué d'un câble et présentant un axe longitudinal. Le tuteur cylindrique comprend une pluralité de tours de base arrangés sans points d'intersection les uns avec les autres, selon le même intervalle que la hauteur (h) des tours de base, le long de la direction longitudinale d'un corps cylindrique. Les tours de base (1) présentent une configuration en zig-zag constituée d'une pluralité de parties apicales (1c) et d'une pluralité de parties de dépression (1b) reliées par des parties rectilignes (1a) le long de la surface circonférencielle. Le tuteur cylindrique comprend également une pluralité de tours de raccordement (2) qui relient la pluralité de tours de base les uns aux autres par enroulement des parties rectilignes (1a) des tours de base superposés en une forme maillée, lesdits tours de raccordement étant arrangés selon le même intervalle que la distance (d) des parties rectilignes des tours de base, dans une direction diagonale s'étendant vers les côtés gauche et droit.
PCT/KR2003/001078 2003-06-02 2003-06-02 Tuteur cylindrique WO2004105853A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2003/001078 WO2004105853A1 (fr) 2003-06-02 2003-06-02 Tuteur cylindrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2003/001078 WO2004105853A1 (fr) 2003-06-02 2003-06-02 Tuteur cylindrique

Publications (1)

Publication Number Publication Date
WO2004105853A1 true WO2004105853A1 (fr) 2004-12-09

Family

ID=33487750

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2003/001078 WO2004105853A1 (fr) 2003-06-02 2003-06-02 Tuteur cylindrique

Country Status (1)

Country Link
WO (1) WO2004105853A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007011122A1 (fr) * 2005-07-15 2007-01-25 Standard Sci-Tech Inc. Endoprothèse vasculaire et son procédé de fabrication
GB2472603A (en) * 2009-08-11 2011-02-16 Cook William Europ Stent graft with bridging element between strut peaks

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994020044A1 (fr) * 1993-03-11 1994-09-15 Medinol Ltd. Extenseur
KR100269572B1 (ko) * 1998-05-02 2000-10-16 김서곤 내강 확장용 스텐트 및 그 제조방법
KR20010084836A (ko) * 2000-02-29 2001-09-06 강성권 스텐트
KR100267019B1 (ko) * 1998-05-15 2001-09-22 김서곤 내강 확장용 스텐트 및 그 제조방법
KR100319663B1 (ko) * 1999-12-07 2002-01-05 이길환 스텐트

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994020044A1 (fr) * 1993-03-11 1994-09-15 Medinol Ltd. Extenseur
KR100269572B1 (ko) * 1998-05-02 2000-10-16 김서곤 내강 확장용 스텐트 및 그 제조방법
KR100267019B1 (ko) * 1998-05-15 2001-09-22 김서곤 내강 확장용 스텐트 및 그 제조방법
KR100319663B1 (ko) * 1999-12-07 2002-01-05 이길환 스텐트
KR20010084836A (ko) * 2000-02-29 2001-09-06 강성권 스텐트

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007011122A1 (fr) * 2005-07-15 2007-01-25 Standard Sci-Tech Inc. Endoprothèse vasculaire et son procédé de fabrication
US8210084B2 (en) 2005-07-15 2012-07-03 Standard Sci-Tech, Inc. Stent and method for manufacturing the same
GB2472603A (en) * 2009-08-11 2011-02-16 Cook William Europ Stent graft with bridging element between strut peaks
GB2472603B (en) * 2009-08-11 2011-12-14 Cook Medical Technologies Llc Implantable medical device
US10195015B2 (en) 2009-08-11 2019-02-05 Cook Medical Technologies Llc Implantable medical device

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