NO300484B1 - Vaso-okklusiv spiral med dertil festede fibröse elementer - Google Patents
Vaso-okklusiv spiral med dertil festede fibröse elementer Download PDFInfo
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- 229910052697 platinum Inorganic materials 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
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- 229920004934 Dacron® Polymers 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
- A61B17/12131—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device
- A61B17/1214—Coils or wires
- A61B17/1215—Coils or wires comprising additional materials, e.g. thrombogenic, having filaments, having fibers, being coated
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
- A61B17/12131—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device
- A61B17/1214—Coils or wires
- A61B17/12145—Coils or wires having a pre-set deployed three-dimensional shape
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00004—(bio)absorbable, (bio)resorbable, resorptive
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
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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
- A61F2/01—Filters implantable into blood vessels
- A61F2002/016—Filters implantable into blood vessels made from wire-like elements
-
- 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
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0091—Three-dimensional shapes helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
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Description
Foreliggende oppfinnelse angår vaso-okklusive innretninger. Mer spesielt angår den en vaso-okklusiv spiral hvortil det er festet fibrøse elementer.
Vaso-okklusive innretninger er kirurgiske implementer som anbringes i kar, karakteristisk via et kateter, for å blokkere strømmen av blod gjennom karet. En type vaso-okklusiv innretning er en skrueformet trådspiral som har viklinger som er dimensjonert for å engasjere veggene i karet. Fibre legges i kryss gjennom viklingene for å gi et substrat for emboliseringen i karet. Spiraler av en slik konstruksjon er kommersielt tilgjengelige fra firma Cook.Inc.
US 4.994.069 beskriver en vaso-okklusiv spiral som inntar en lineær skruekonfigurasjon når den strekkes og en foldet, konvoluttert konfigurasjon i avspent tilstand. Den strukkede tilstand benyttes ved anbringelse av spiralen på det ønskede sted og spiralen inntar sin avspenningskonfigurasjon, en konfigurasjon som er bedre egnet for å okkludere karet, med en gang innretningen er på plass.
En hovedgjenstand for foreliggende oppfinnelse er å tilveie-bringe en skrueformet vaso-okklusiv spiral hvortil det er festet fibrøse elementer på en slik måte at man sikrer at de ikke løsrives fra spiralen og øker spiralens evne til å lette embolisering.
I henhold til dette angår foreliggende oppfinnelse en vaso-okklusiv innretning omfattende: a) en spiral med et antall viklinger mellom en første og en andre ende; og b) minst et fibrøst element med en første ende og en andre ende,
og denne innretning karakteriseres ved at den del av minst et fibrøst element som ligger mellom spiral-endene forløper aksialt langs spiralen generelt i serpentinkonfigurasjon tildannet ved et antall løkker i maksima som strekker seg
radialt utover og minima som forløper radialt innover og er gjenget rundt individuelle viklinger i avstand fra hverandre langs spiralen.
Oppfinnelsen skal illustreres nærmere under henvisning til de ledsagende tegninger, der fig. 1-11 er fragmentære riss (ikke i målestokk) av utførelsesformer av skruespiraler ifølge oppfinnelsen. Fig. 1 og 2 viser den spesifikke metode for festing av fibrene til spiralen.
I tegningene er like konstruksjonsdeler gitt de samme henvisningstall.
Fig. 1 viser en utførelsesf orm, generelt kalt 10, av den vaso-okklusive spiral ifølge oppfinnelsen. Innretningen 10 har to komponenter: en skrueformet spiral 11 og et fibrøst element 12.
Spiralen 11 vil karakteristisk bestå av et radiopakt materiale som platina, wolfram, gull, rustfritt stål, eller av legeringer som wolfram og platina. En wolfram-platina legering er foretrukket på grunn av styrken og seigheten. Materialet er fortrinnsvis radiopakt og diameteren for tråden som benyttes vil vanligvis ligge innen området 0,05 til 0,25 mm. Spiralen har et antall individuelle viklinger 13. Den aksiale lengde for spiralen vil vanligvis ligge innen området 0,2 til 100 cm, vanligvis 0,2 til 40 cm, og diameteren for spiralen vil vanligvis være 0,015 til 0,1 cm og vanligvis 0,025 til 0,1 cm. Spiralen vil karakteristisk ha ca. 20 til 70 viklinger/cm, fortrinnsvis 10 til 40
viklinger/cm.
I en annen utførelsesform kan diameteren for den radiopake spiral 11 ligge i området 0,05 til 0,25 mm. Spiralen har et antall individuelle viklinger 13. Den aksiale lengde for spiralen vil vanligvis være i området 0,2 til 100 cm og vanligvis 0,2 til 40 cm og diameteren for spiralen vil vansligvis være 0,05 til 0,2 cm og helst 0,05 til 0,15 cm. Spiralen vil karakteristisk ha 5 til 70 viklinger/cm, og fortrinnsvis 5 til 40 viklinger/cm. Slike spiraler er spesielt egnet der det er ønskelig med spiraler med stor diameter eller spiraler med høy styrke, f.eks. ved okklusjon i store kar.
Det fibrøse element 12 kan være en bunt av individuelle fibre 14, karakteristisk 5 til 100 fibre/bunt og fortrinnsvis 20 til 30 fibre/bunt, slik det vises i fig. 1, eller et monofilament som vist i fig. 2. Fibrene kan bestå av biokompatible materialer som dakron (polyester), polyglukol-syre, polyeddiksyre, fluorpolymer (polytetrafluoretylen), nylon (polyamid) eller silke.
I utførelsesformen 10 er enden 16 av bunten bundet til viklingen 17 på spiralen ved hjelp av en knute 18. Knuting ved enden av bunten er ønskelig, men ikke vesentlig da treeingen av løkker rundt viklingene (se nedenfor) er tilstrekkelig til å forankre bunten til spiralen. Den spesifikke lokasjon av festingen av enden 16 er ikke kritisk og vil karakteristisk være enten i den proksimale ende 18 av spiralen eller på et sted på spiralen i avstand fra den proksimale ende som er større enn løkkelengden (se nedenfor) når løkken ligger flatt mot spiralen. Fiberbunten forløper i generell serpentinform eller i en sinusoidbølgekonfigurasjon langs det ytre av spiralen i en serie ut over dette (i forhold til spiralaksen), løkker 19 og innoverrettede løkker 20. De innoverrettede løkker er tredd rundt individuelle viklinger, angitt med 21,22,23 og 24 i intervaller i avstand fra hverandre (antydet som avstanden A) mellom knutene 18 og viklingen 21) langs spiralen. I fig. 1 er de individuelle viklinger vist i en noe ekspandert tilstand for illustra-sjonsformål. Vanligvis vil imidlertid viklingene være nærmere hverandre slik at viklingene på hver side av viklingene 21,22,23 og 24 klemmer fiberbuntene mot viklingene 21,22,23 og 24. Lengden av intervallene ("a") mellom viklingene rundt hvilke fiberbunten passerer, kan variere. Den vil karakteristisk være 0,05 til 1 cm. Intervallavstanden kan være den samme eller den kan variere langs spirallengden. På tilsvar-ende måte kan løkkelengden (det vil si den kurvilineære lengde av bunten fra knuten 18 til viklingen 21) variere og være den samme eller forskjellig fra løkke til løkke. Løkkelengden vil vanligvis være 0,1 til 2 cm og fortrinnsvis 0,1 til 0,5 cm.
Det fibrøse element vil vanligvis forløpe over mellom 10 og 90% av den totale aksiale lengde av spiralen. Med andre ord vil den aksiale avstand over hvilken elementet forløper, vanligvis være 0,05 til 90 cm og fortrinnsvis 0,05 til 15 cm.
(Den stiplede linje i tegningen antyder at spolen fortsetter distalt.) Elementet vil karakteristisk være lokalisert ved den proksimale ende av tråden. I denne henseende er "proksi-mal" å forstå i forhold til en orientering der spolen er anbragt i et kateter. Den distale ende av elementet festes ved en knute 25 til viklingen 26.
Mens fig. 1 viser en spole med kun en enkelt festet fiber-bunt, vil man lett forstå at et antall, karakteristisk 2 til 4, fiberbunter på samme måte kan festes i intervaller rundt omkretsen av spiralen. Fig. 2 viser en annen utførelsesform, generelt kalt 20 av den vaso-okklusive innretning ifølge oppfinnelsen. Det er to forskjeller mellom innretningen 10 og innretningen 30: (1) det fibrøse element i fig. 2 er et monofilament 15 og (2) det er to monofilamenter 15 festet til spiralen istedetfor et enkelt fibrøst element. Som vist er de to monofilamenter anorndet i en avstand av ca. 180° langs omkretsen av spiralen. Som tilfellet er med innretningen 10 kan ytterlig-ere monofilamenter 15 festes til spiralen hvis ønskelig. Fig. 3 til 11 viser varianter av oppfinnelsen, men for forenklet forklaring vises formen under innføring (fig. 3 og 9) eller efter innføring (4,5,6 til 8 samt 10 og 11), men uten oppfinnelsens fibre. Fibrene er festet på samme måte og i samme konfigurasjon som vist i fig. 1 og 2. Fig. 3 viser et partielt sideriss av spiralen 40 i den konfigurasjon den befinner seg i under installering. Karakteristisk vil spiralen 40 være anbragt på en trådkjerne som ligger inne i et kateter og hvilken tråd vil holde spiralen 40 i lineær form inntil den slippes fri fra trådenden. Fig. 4 viser spiralen ifølge krav 3 efter at den er satt fri fra enden av førings- eller kjernetråden. Spiralen snor seg tilbake mot seg selv og danner en sekundærspiral med diameteren 42. Sekundærspiraldiameteren 42 kan være opptil størrelsen av karet som skal okkluderes. Fig. 5 viser spiralen ifølge krav 3 der spiralen har irregulariteter i spiralviklingene som tillater dannelsen av den foldede, konvolutterte konfigurasjon i spiralens avspente tilstand. Som man ser er de mange konvolusjoner eller irregulariteter i utførelsen slik at skrueaksen forskyves (pilene i fig. 4) ved hver vikling med ca. 20 til 40". Fig. 6,7 og 8 viser alle et annet trekk ved oppfinnelsen. Mens fig. 1 og fig. 2 viser skruespiraler som er av lineær form viser fig. 6 til 8 forskjelligformede spiraler som kan benyttes ifølge oppfinnelsen. Fig. 6 viser en kløverblad-formet vaso-okklusiv spiral, fig. 7 viser en åttetallsformet spiral og fig. 8 viser en C-formet vaso-okklusiv spiral. Fibrene som er festet til disse spiraler er analoge med de fibre som er festet til spiralene i fig. 1 og fig. 2. Fig. 9 og 10 viser vaso-okklusiv spiral som angitt ovenfor, men der irregularitetene i skrueviklingen fremstilles ved utflating av trådspiralen i forskjellige retninger. Dette kan oppnås ved å flate ut eller å presse den lineære spiral 50 et
antall punkter 52 langs viklingen i forskjellige vinkler, hvis dette er ønskelig, som vist i fig. 9. Den således dannede spiral vil ha det generelle utseende som er vist i fig. 9 når den befinner seg i lineær konfigurasjon og som vist i fig. 10 i avspent konfigurasjon. De utflatede deler av spiralen 52 må ha en diameter som er mindre enn den indre diameter for kateteret gjennom hvilket den må passere.
Fig. 11 viser en spiral med en primær spiralstruktur som beskrevet ovenfor med en skruevikling 54 med minst en skruedreining hvis diameter 65 er av samme størrelse som karet som skal okkluderes. I denne variant har irregularitetene i skrueviklingen form av kontinuerlig endrede skruediametre som dannes spiraler som er dimensjonert til å spenne ut tverrsnittsarealet for karet.
Nok en gang inkluderer variasjonene som vist i fig. 3 til 11 fibrene som uavhengig vist i fig. 1 eller i fig. 2.
De vaso-okklusive spiralene ifølge oppfinnelsen benyttes på samme måte som spiralen i US 4.994.069. Kort sagt blir spiralen fortrinnsvis levert i forpakket form i en steril kanyle som er tilpasset engasjement med den proksimale ende av et kateter. Sløyfene av den fibrøse bunt presses flatt mot spiralen for forskyvning i kanyle og kateter. Med en gang kateteret er på plass i et kar blir den spiralholdige kanyle anbragt i engasjement med den proksimale ende av kateteret og spiralen overføres fra kanylelysåpningen til kateterlys-åpningen ved å utøve en kraft på den proksimale ende av spiralen. En skyvestav benyttes for å skyve spiralen gjennom kateteret til det ønskede spiralfrigjøringsete. Lokasjonen av spiralen kan visualiseres på grunn av spiralens radiopasitet. Med en gang den er på plass blir spiralen skjøvet ut fra kateteråpningen til karet. Dette tillater at de fleksible fiberløkker utvider seg utover fra spiraloverflaten og fyller karet.
Claims (7)
1.
Vaso-okklusiv innretning omfattende : (a) en spiral (11) med et antall viklinger (13) mellom en første og en andre ende; og (b) minst et fibrøst element (12) med en første ende og en andre ende,
karakterisert ved at den del av minst et fibrøst element (12) som ligger mellom spiral-endene forløper aksialt langs spiralen (11) generelt i serpentinkonfigurasjon tildannet ved et antall løkker i maksima som strekker seg radialt utover og minima som forløper radialt innover og er gjenget rundt individuelle viklinger (13) i avstand fra hverandre langs spiralen (11).
2.
Innretning ifølge krav 1, karakterisert ved at den har en lengde på 2 til 100 cm, en diameter på 0,05 til 0,2 cm og oppviser 5 til 70 viklinger/cm.
3.
Innretning ifølge krav 2, karakterisert ved at det fibrøse element (12) er festet til den proksimale ende av spiralen og forløper over 10 til 90$ av spiralens (11) lengde.
4.
Innretning ifølge krav 2, karakterisert ved at det fibrøse element (12) er en bunt av individuelle fibre (14).
5 .
Innretning ifølge krav 2, karakterisert ved at det fibrøse element er et monofilament (15).
6.
Innretning ifølge krav 2, karakterisert ved at lengden av en individuell sløyfe er 0,1 til 2 cm.
7.
Innretning ifølge et hvilket som helst av de foregående krav, karakterisert ved at intervall-avstanden er 0,05 til 1 cm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/771,013 US5226911A (en) | 1991-10-02 | 1991-10-02 | Vasoocclusion coil with attached fibrous element(s) |
PCT/US1992/008335 WO1993006884A1 (en) | 1991-10-02 | 1992-10-01 | Vaso-occlusion coil with attached fibrous element(s) |
Publications (3)
Publication Number | Publication Date |
---|---|
NO941061L NO941061L (no) | 1994-03-23 |
NO941061D0 NO941061D0 (no) | 1994-03-23 |
NO300484B1 true NO300484B1 (no) | 1997-06-09 |
Family
ID=25090422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO941061A NO300484B1 (no) | 1991-10-02 | 1994-03-23 | Vaso-okklusiv spiral med dertil festede fibröse elementer |
Country Status (19)
Country | Link |
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US (1) | US5226911A (no) |
EP (1) | EP0606392B1 (no) |
JP (1) | JPH0763508B2 (no) |
KR (1) | KR0126071B1 (no) |
AT (1) | ATE149359T1 (no) |
AU (2) | AU2686292A (no) |
CA (1) | CA2084749C (no) |
CZ (1) | CZ280038B6 (no) |
DE (1) | DE69217975T2 (no) |
DK (1) | DK0606392T3 (no) |
ES (1) | ES2101122T3 (no) |
FI (1) | FI941499A (no) |
HU (1) | HUT68205A (no) |
IL (2) | IL103240A0 (no) |
NO (1) | NO300484B1 (no) |
NZ (1) | NZ244607A (no) |
PT (1) | PT100927A (no) |
TW (1) | TW259698B (no) |
WO (2) | WO1993006883A1 (no) |
Families Citing this family (319)
Publication number | Priority date | Publication date | Assignee | Title |
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US5851206A (en) * | 1990-03-13 | 1998-12-22 | The Regents Of The University Of California | Method and apparatus for endovascular thermal thrombosis and thermal cancer treatment |
US5569245A (en) | 1990-03-13 | 1996-10-29 | The Regents Of The University Of California | Detachable endovascular occlusion device activated by alternating electric current |
US6083220A (en) * | 1990-03-13 | 2000-07-04 | The Regents Of The University Of California | Endovascular electrolytically detachable wire and tip for the formation of thrombus in arteries, veins, aneurysms, vascular malformations and arteriovenous fistulas |
US5122136A (en) * | 1990-03-13 | 1992-06-16 | The Regents Of The University Of California | Endovascular electrolytically detachable guidewire tip for the electroformation of thrombus in arteries, veins, aneurysms, vascular malformations and arteriovenous fistulas |
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- 1992-09-15 WO PCT/US1992/007794 patent/WO1993006883A1/en active Application Filing
- 1992-09-22 IL IL103240A patent/IL103240A0/xx unknown
- 1992-10-01 ES ES92922060T patent/ES2101122T3/es not_active Expired - Lifetime
- 1992-10-01 EP EP92922060A patent/EP0606392B1/en not_active Expired - Lifetime
- 1992-10-01 KR KR1019940701070A patent/KR0126071B1/ko active
- 1992-10-01 WO PCT/US1992/008335 patent/WO1993006884A1/en active IP Right Grant
- 1992-10-01 CA CA002084749A patent/CA2084749C/en not_active Expired - Lifetime
- 1992-10-01 HU HU9400961A patent/HUT68205A/hu unknown
- 1992-10-01 JP JP5507035A patent/JPH0763508B2/ja not_active Expired - Lifetime
- 1992-10-01 AT AT92922060T patent/ATE149359T1/de not_active IP Right Cessation
- 1992-10-01 AU AU28686/92A patent/AU661871B2/en not_active Ceased
- 1992-10-01 DE DE69217975T patent/DE69217975T2/de not_active Expired - Lifetime
- 1992-10-01 DK DK92922060.6T patent/DK0606392T3/da active
- 1992-10-01 CZ CZ94666A patent/CZ280038B6/cs unknown
- 1992-10-02 IL IL10332892A patent/IL103328A/en not_active IP Right Cessation
- 1992-10-02 NZ NZ244607A patent/NZ244607A/en unknown
- 1992-10-02 PT PT100927A patent/PT100927A/pt not_active Application Discontinuation
-
1993
- 1993-01-27 TW TW082100505A patent/TW259698B/zh active
-
1994
- 1994-03-23 NO NO941061A patent/NO300484B1/no unknown
- 1994-03-30 FI FI941499A patent/FI941499A/fi not_active Application Discontinuation
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CA2084749A1 (en) | 1993-04-03 |
IL103328A (en) | 1995-12-08 |
WO1993006883A1 (en) | 1993-04-15 |
IL103328A0 (en) | 1993-03-15 |
TW259698B (no) | 1995-10-11 |
ES2101122T3 (es) | 1997-07-01 |
JPH06506622A (ja) | 1994-07-28 |
EP0606392A4 (en) | 1994-08-17 |
AU2868692A (en) | 1993-05-03 |
NZ244607A (en) | 1994-08-26 |
CA2084749C (en) | 1994-09-27 |
KR0126071B1 (ko) | 1997-12-19 |
NO941061L (no) | 1994-03-23 |
JPH0763508B2 (ja) | 1995-07-12 |
AU2686292A (en) | 1993-05-03 |
EP0606392B1 (en) | 1997-03-05 |
US5226911A (en) | 1993-07-13 |
CZ280038B6 (cs) | 1995-10-18 |
HU9400961D0 (en) | 1994-06-28 |
HUT68205A (en) | 1995-06-28 |
AU661871B2 (en) | 1995-08-10 |
NO941061D0 (no) | 1994-03-23 |
FI941499A0 (fi) | 1994-03-30 |
DK0606392T3 (da) | 1997-07-28 |
WO1993006884A1 (en) | 1993-04-15 |
IL103240A0 (en) | 1993-02-21 |
DE69217975D1 (de) | 1997-04-10 |
DE69217975T2 (de) | 1997-06-12 |
CZ66694A3 (en) | 1994-06-15 |
PT100927A (pt) | 1994-06-30 |
FI941499A (fi) | 1994-05-16 |
ATE149359T1 (de) | 1997-03-15 |
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