CZ288740B6 - Flexibilní roztažitelný stent - Google Patents
Flexibilní roztažitelný stent Download PDFInfo
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- 239000008280 blood Substances 0.000 description 1
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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 sheets 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 sheets or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
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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 sheets or tubes, e.g. perforated by laser cuts or etched holes
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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
- A61F2/856—Single tubular stent with a side portal passage
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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 sheets 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 sheets or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
- A61F2002/91533—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 sheets or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other characterised by the phase between adjacent bands
- A61F2002/91541—Adjacent bands are arranged out of phase
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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 sheets 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 sheets 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
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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
- 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
- A61F2230/0004—Rounded shapes, e.g. with rounded corners
- A61F2230/0013—Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
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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
- 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
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Abstract
Stent (30) pro implantov n do t la je tvo°en trubic maj c vzorovan² tvar, kter² m prvn a druh z krutov vzory (11, 12) maj c osy prob haj c v prvn m a druh m sm ru. Prvn z krutov vzory (11) jsou tvo°eny sud²mi a lich²mi z krutov²mi vzory (11e, 11o). Sud a lich z krutov vzory (11e, 11o) jsou vz jemn f zov posunuty o 180.sup.o.n. a lich z krutov vzory (11o) se nach zej v dy mezi dv mi sud²mi z krutov²mi vzory (11e). Druh z krutov vzory (12) jsou vz jemn propojeny s prvn mi z krutov²mi vzory (11). Prvn a druh² sm r mohou b²t vz jemn ortogon ln . Druh z krutov vzory (12) jsou tvo°eny sud²mi a lich²mi z krutov²mi vzory (12e, 12o).\
Description
Oblast techniky
Vynález se obecně týká stentů určených pro implantaci do živého těla.
Dosavadní stav techniky
V tomto oboru je v současnosti známá celá řada různých stentů. Výraz „stent“, jak je použit v textu této přihlášky vynálezu, označuje zařízení vyrobené z materiálu slučitelného s tělem, které se používá k rozšíření krevních cév nebo jiných otvorů v těle a k udržení konečné velikosti průchodu. Zpravidla se stent dopravuje do požadované oblasti v těle spolu s nafukovacím balónkem a jakmile se balónek nafoukne, stent se roztáhne, čímž rozšíří zmíněný otvor. Pro roztažení se používají i další mechanická zařízení.
Některé příkladné druhy stentů popisují například následující patentové dokumenty: patent US 5,019,090 (Pinchuk), US 5,161,547 (Tower), US 4,950,227 (Savin a kol.), US 5,314,472 (Fontaine), US 4,886,062 a US 4,969,458 (Wiktor) a US 4,856,516 (Hillstead). Stenty vyrobené z řezaného zásobního materiálu jsou popsány v patentech US 4,733,665 (Palmaz), US 4,762,128 (Rosenbluth), US 5,102,417 (Palmaz a Schatz), US 5,195,984 (Schatz) a W0 91FR013820 (Meadox).
Stenty popsané v patentu US 5,102,417 (Palmaz a Schatz) mají roztažitelné trubicovité rouby vzájemně spojené flexibilní spojkou. Tyto rouby jsou opatřeny množinou drážek uspořádaných paralelně k podélné ose trubice. Pružné spojky jsou helikálními spojkami. Vzhledem ktomu, že jsou trubicovité rouby relativně tuhé, jsou helikální spojky potřebné pro ohýbání stentů při jejich protahování skrze zakřivenou krevní cévu. Pokud se stenty podle patentu US 5,102,417 roztahují, dochází u roubů k radiálnímu roztažení a v důsledku toho k podélnému smrštění. Současně však dochází ke kroucení helikálních spojek a tento kroutivý pohyb je pravděpodobně pro krevní cévu nejškodlivější.
Patent US 5,195,984 (Schatz) popisuje podobný stent, ale s jednou přímou spojkou, která je paralelní s podélnou osou trubkovitých roubů, uspořádanou mezi trubkovými rouby. Tento přímý člen sice eliminuje kroutivý pohyb, avšak není příliš pevný.
Podstata vynálezu
Cílem vynálezu je tedy poskytnout flexibilní stent, který by se při roztahování minimálně smršťoval v podélném směru.
Stent podle vynálezu je tedy tvořen trubicí, která má vzorovaný tvar, přičemž tento stent je charakteristický tím, že vzorovaný tvar zahrnuje sudé první zákrutové vzory mající osu probíhající v prvním směru; liché první zákrutové vzory rovněž mající osy probíhající v prvním směru, přičemž liché první zákrutové vzory jsou o 180° fázově posunuty od sudých prvních zákrutových vzorů a vyskytují se vždy mezi dvěma sudými prvními zákrutovými vzory; druhé zákrutové vzory mající osu probíhající ve druhém směru odlišném od prvního směru, přičemž druhé zákrutové vzory jsou vzájemně propojeny se sudými a lichými prvními zákrutovými vzory a tvoří tak obecně rovnoměrně distribuovanou strukturu.
U jednoho provedení má flexibilní roztažitelný stent podle vynálezu sudé první zákrutové vzory a liché první zákrutové vzory probíhající periodicky okolo os v prvním směru a druhé zákrutové vzory probíhající periodicky kolem os ve druhém směru.
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U dalšího provedení mají druhé zákrutové vzory flexibilního roztažitelného stentu podle vynálezu dva ohyby na periodu a sudé a liché první zákrutové vzory jsou připojeny k první resp.
druhé straně každého ohybu.
Druhé zákrutové vzory flexibilního stentu podle vynálezu jsou u výhodného provedení tvořeny sudými a lichými druhými zákrutovými vzory. Sudé a liché první zákrutové vzory mají ohyby a sudé a liché druhé zákrutové vzory jsou spojeny se sudými a lichými prvními zákrutovými vzory tak, že ponechávají mezi každým párem sudých a lichých druhých zákrutových vzorů jednu uzavřenou smyčku.
Podle výhodného provedení vynálezu jsou první a druhý směr ortogonální.
U výhodného provedení vynálezu jsou navíc první a druhé zákrutové vzory vytvořeny z plochého materiálu. Alternativně mohou být vytvořeny z drátu a navíc mohou být zapouzdřeny nebo obaleny libovolným materiálem, který je snášenlivý s tělem.
Přehled obrázků na výkresech
Vynález se stane zřejmějším po prostudování následujícího podrobnějšího popisu s přihlédnutím k doprovodným výkresům, na kterých obr. 1 znázorňuje vzorovaný stent konstruovaný v souladu s prvním výhodným provedením vynálezu;
obr. 2 znázorňuje vzor stentu z obrázku 1;
obr. 3 znázorňuje stent z obrázku 1 v zahnuté poloze;
obr. 4 znázorňuje stent z obrázku 1 v roztaženém stavu;
obr. 5A a 5B znázorňují změny, ke kterým dojde ve vzoru stentu z obrázku 1 v důsledku roztažení;
obr. 6 schematicky znázorňuje druhé provedení vzoru pro stent podle vynálezu;
obr. 7 znázorňuje třetí provedení vzoru pro stent podle vynálezu; a obr. 8 znázorňuje vzor z obrázku 7 v roztaženém stavu.
Příklady provedení vynálezu
Co se týče obrázků 1 až 4, které znázorňují první provedení stentu podle vynálezu, obrázek 1 znázorňuje stent v jeho neroztažené formě, obr. 2 znázorňuje vzor tohoto stentu, obr. 3 ho znázorňuje v částečně zahnuté poloze a obr. 4 ho znázorňuje v roztažené formě.
Stent podle vynálezu je trubicí, jejíž strany jsou tvořeny množinou vždy dvou ortogonálních zákrutových vzorů, které jsou vzájemně vnitřně propojeny. Výraz „zákrutový vzor“, jak je uveden, vykresluje periodický vzor okolo středové linie a „ortogonální zákrutové vzory“ jsou vzory, jejichž středové linie jsou vzájemně ortogonální.
U stentu znázorněného na obrázcích 1 až 4 jsou tyto dva zákrutové vzory 11 a 12 nejlépe patrné z obrázku 2. Zákrutový vzor 11 je vertikálním sinusoidem majícím vertikální středovou linii 9.
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Zákrutový vzor 11 má dva ohyby 14 a 16 na periodu, přičemž ohyb 14 je otevřen napravo, zatímco ohyb 16 je otevřen nalevo. Ohyby 14 a 16 sdílení společné členy 15 a 17, přičemž člen spojuje jeden ohyb 14 s následujícím ohybem 16 a člen 17 spojuje jeden ohyb 16 s následujícím ohybem 14.
Zákrutový vzor 12 je horizontálním vzorem majícím horizontální středovou linii 13. Zákrutový vzor 12 má rovněž ohyby 18 a 20, ale mezi ohyby jedné periody prochází přímá sekce 22. Ohyby 18 jsou otevřeny směrem dolů a ohyby 20 jsou otevřeny směrem nahoru. Vertikální zákrutový vzor Hje tvořen sudou a lichou verzí (e a o), které jsou vzájemně fázově posunuty o 180°. Takže 1 každý nalevo otevřený ohyb 16 zákrutového vzoru 1 lo je orientován k doprava otevřenému ohybu 14 zákrutového vzoru Ile a doprava otevřený ohyb 14 zákrutového vzoru llo je orientován k nalevo otevřenému ohybu 16 zákrutového vzoru 1 le.
Horizontální zákrutový vzor 12 má rovněž lichou a sudou formu. Přímé sekce 22 horizontálního zákrutového vzoru 12e protíná každý třetí společný člen 17 vertikálního zákrutového vzoru 1 le. Přímé sekce 22 horizontálního zákrutového vzoru 12o protínají každý třetí společný člen 15 vertikálního zákrutového vzoru llo. Výsledkem je vytvoření uzavřené smyčky 14 mezi zákrutovými vzory 12e a 12o a uzavřené smyčky 16 mezi zákrutovými vzory 12o a 12e.
Zpět k obrázku 1, vzor z obrázku 2 je utvářen do trubice 30 vyrobené ze snadno deformovatelného materiálu, například z kovu. Vzhledem ke dvěma zákrutovým vzorům je stent z obrázku 1, pokud přichytí přes katétrový balón, pružný a lze ho proto snadno protáhnout skrze zakřivené krevní cévy. Příklad způsobu ohnutí stentu z obrázku 1 je znázorněn na obrázku 3.
Na tomto obrázku se stent začíná ohýbat v místě označeném vztahovou značkou A ve směru naznačeném šipkou 40. Jakmile se stent začne ohýbat, sekce I se ocitne uvnitř křivky, zatímco sekce O se ocitne vně křivky. Vnitřní strana I křivky se zkracuje oproti vnější straně O křivky.
Během zakřivení ohyby 14-20 ležící napravo od bodu A mění svůj tvar s cílem kompenzovat rozdíl v délce vnitřní a vnější křivky. Například ohyby 18i a 20i v blízkosti vnitřní strany křivky jsou vzájemně blíž, než ohyby 18o a 20o na vnější straně křivky. Ohyby 14i a 16i, které se nacházejí v blízkosti vnitřní křivky I se stlačují zatímco ohyby 14o a 16o v blízkosti vnější strany O křivky se roztahují.
Jak může být patrné z obrázků, oba zákrutové vzory 11 a 12 jsou do ohybu zapojeny. Ačkoliv to není ukázáno, je zřejmé, že stent z obrázků 1 až 4 se může ohýbat v libovolném směru a dokonce současně ve více směrech najednou.
Obr. 4 znázorňuje stent z obr. 1 v jeho roztažené formě. Pokud se stent roztáhne, roztáhnou se oba zákrutové vzory 11 a 12 (tj. všechny ohyby 14-20 se otevřou). Jak je možné sledovat, roztažený stent má dva typy ohraničených prostorů, velký prostor 42 mezi zákrutovými vzory 12o a 12e a malý prostor 44 mezi zákrutovými vzory 12e a 12o. Rovněž je patrné, že každý velký prostor 42 má dva ohyby 14 na své levé straně a dva ohyby 16 na své pravé straně. Velké prostory 42a mezi vertikálními zákrutovými vzory Ile a llo mají nahoře a dole ohyby 18, i zatímco velké prostory 42b mezi vertikálními zákrutovými vzory Ho a Ile mají nahoře a dole ohyby 20. Podobně je tomu u malých prostorů 44a a 44b.
Je třeba uvést, že díky ortogonálním zákrutovým vzorům 11 a 12, nedochází u stentu z obrázku 1 v průběhu roztahování k podstatnějšímu smršťování v podélném směru. Tuto skutečnost ilustrují detailně obrázky 5A a 5B. Obrázek 5A znázorňuje pohyb jednoho vertikálního zákrutového vzoru H v průběhu roztažení a obrázek 5B ilustruje pohyb jednoho horizontálního zákrutového vzoru 12 v průběhu roztažení. Původní vzory jsou zobrazeny pomocí plných čar, zatímco roztažené vzory jsou zobrazeny pomocí přerušovaných čar.
-3CZ 288740 B6
Vertikální zákrutový vzor 11 na obr. 5A se rozpíná tak, že rozšiřuje své ohyby 14 a 16.
V důsledku toho vertikální zákrutový vzor 11 roste ve vertikálním směru o 2.h] na ohyb.
Nicméně tento vzor se rovněž smršťuje, a to v horizontálním směru o 2.di. Podobně se v důsledku roztažení ohybů 18 a 20 roztahuje horizontální zákrutový vzor 12 na obr. 5B.
V důsledku roztažení zmíněných ohybů se zákrutový horizontální vzor 12 roztahuje v horizontálním směru o 2.d2 na ohyb. Avšak i on se smršťuje, a to ve vertikálním směru o h2. Takže vertikální růst vertikálního zákrutového vzoru 11 kompenzuje alespoň částečně vertikální smrštění horizontálního zákrutového vzoru 12 a naopak. Je třeba upozornit, že koncové části libovolného stentu jsou kompenzovány pouze částečně a mohou se tedy poněkud smršťovat.
Dá se předpokládat, že dva ortogonální zákrutové vzory 11 a 12 a jejich vzájemná kompenzace poskytnou flexibilitu neroztaženému stentu z obrázku 1. Nicméně pokud je stent roztažen, poskytnou změny v jednotlivých ohybech 14 a 16 výslednému stentu tuhost a umožní mu tak udržet požadovaný vnitřní průměr krevní cévy.
Stent podle vynálezu lze vyrobit z plochého kovu, kteiý je vyleptán do vzoru znázorněného na obrázku 2.Vyleptaný kov se následně stočí do formy trubice 30. Alternativně lze vzor z obrázku 2 vyrobit ze svařovacího nebo krouceného drátu.
Je zřejmé, že stent podle vynálezu může být vyroben z kovu a/nebo drátu. Kromě toho může být pokryt ochranným materiálem, zapouzdřen a/nebo pokryt lékařským materiálem, který může vyplnit prostory 42 a 44.
Je zřejmé, že do rozsahu předloženého vynálezu spadají všechny stenty vyrobené se vzorem 25 tvořeným dvěma zákrutovými vzory, které zaujímají vzájemně ortogonální nebo jinou pozici.
Další příkladný vzor, rovněž s ortogonálně uspořádanými zákrutovými vzory, který ukazuje obrázek 6 a schematicky obrázek 7, je zaoblenější verzí. Obrázek 8 ukazuje vzor z obrázku 7 v roztažené formě. Vzor z obrázků 6 a 7 je podobný vzoru znázorněnému na obrázku 2 s tou výjimkou, že má více horizontálních zákrutových vzorů 12, které se nerozlišují na sudé a liché, 30 ale jsou pouze jednoho druhu.
Jak je patrné z obrázků 6 a 7, tento vzor má dva typy vertikálních zákrutových vzorů Ile a llo, které jsou od sebe fázově posunuty o 180°. Horizontální zákrutové vzory 12 se spojují se všemi liniemi 15 vertikálního zákrutového vzoru 1 le.
Obrázek 8 znázorňuje vzor z obrázku 7 v roztažené formě. Protože tento vzor nemá sudé a liché horizontální zákrutové vzory, nevznikají v jeho struktuře při roztažení ani velké a malé prostory Namísto toho mají všechny vzniklé ohraničené prostory stejnou velikost.
V závěru je třeba uvést, že výše detailněji popsaná příkladná provedení vynálezu mají pouze ilustrovat podstatu vynálezu a nikterak omezovat jeho rozsah, který je jednoznačně vymezen přiloženými patentovými nároky.
Claims (8)
- PATENTOVÉ NÁROKY1. Flexibilní roztažitelný stent tvořený trubicí mající vzorovaný tvar, vyznačený tím, že tento vzorovaný tvar zahrnuje:a. sudé první zákrutové vzory (Ile) mající osu probíhající v prvním směru;b. liché první zákrutové vzory (Ho) rovněž mající osy probíhající v prvním směru, přičemž liché první zákrutové vzory (Ho) jsou o 180° fázově posunuty od sudých prvních zákrutových vzorů (1 le) a nacházejí se vždy mezi dvěma sudými zákrutovými vzory (Ile);c. druhé zákrutové vzory (12) mající osu probíhající ve druhém směru odlišném od prvního směru, přičemž druhé zákrutové vzory (12) jsou vzájemně propojeny se sudými a lichými prvními zákrutovými vzory (Ile, 1 lo) a tvoří tak obecně rovnoměrně distribuovanou strukturu.
- 2. Flexibilní roztažitelný stent podle nároku 1,vyznačený tím, že sudé první zákrutové vzory (Ile) a liché první zákrutové vzory (Ho) probíhají periodicky okolo os v prvním směru a druhé zákrutové vzory (12) probíhají periodicky kolem os ve druhém směru.
- 3. Flexibilní roztažitelný stent podle některého z nároků 1 nebo 2, vyznačený tím, že druhé zákrutové vzory (12) mají dva ohyby (18; 20) na periodu a sudé a liché první zákrutové vzory (Ile, 11 o) jsou připojeny k první respektive druhé straně každého ohybu (18; 20).
- 4. Flexibilní roztažitelný stent podle některého z předcházejících nároků, vyznačený tím, že druhé zákrutové vzory (12) jsou tvořeny sudými a lichými druhými zákrutovými vzory (12e, 12o).
- 5. Flexibilní roztažitelný stent podle nároku 4, vyznačený tím, že sudé a liché první zákrutové vzory (Ile, 1 lo) mají ohyby (14; 16) a sudé a liché druhé zákrutové vzory (12e, 12o) jsou spojeny se sudými a lichými prvními zákrutovými vzory (1 le, 1 lo) tak, že ponechávají mezi každým párem sudých a lichých druhých zákrutových vzorů (12e, 12o) jednu uzavřenou smyčku.
- 6. Flexibilní roztažitelný stent podle některého z nároků 1 až 5, vyznačený tím, že první a druhý směr jsou ortogonální.
- 7. Flexibilní roztažitelný stent podle některého z předcházejících nároků 1 až 6, vyznačený tím, že první a druhé zákrutové vzory (11, 12) j sou vytvořeny z drátu.
- 8. Flexibilní roztažitelný stent podle některého z nároků 1 až 6, vyznačený tím, že první a druhé zákrutové vzory (11, 12) jsou vytvořeny z plochého kovu.
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| US28218194A | 1994-07-28 | 1994-07-28 | |
| US08/457,354 US5733303A (en) | 1994-03-17 | 1995-05-31 | Flexible expandable stent |
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| CZ19197A3 CZ19197A3 (en) | 1997-06-11 |
| CZ288740B6 true CZ288740B6 (cs) | 2001-08-15 |
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| CZ1997191A CZ288740B6 (cs) | 1994-07-28 | 1995-07-26 | Flexibilní roztažitelný stent |
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Legal Events
| Date | Code | Title | Description |
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| PD00 | Pending as of 2000-06-30 in czech republic | ||
| MM4A | Patent lapsed due to non-payment of fee |
Effective date: 20040726 |