DE19807236A1 - Zwischenwirbelimplantat - Google Patents
ZwischenwirbelimplantatInfo
- Publication number
- DE19807236A1 DE19807236A1 DE19807236A DE19807236A DE19807236A1 DE 19807236 A1 DE19807236 A1 DE 19807236A1 DE 19807236 A DE19807236 A DE 19807236A DE 19807236 A DE19807236 A DE 19807236A DE 19807236 A1 DE19807236 A1 DE 19807236A1
- Authority
- DE
- Germany
- Prior art keywords
- intervertebral implant
- implant according
- wedge
- end position
- threaded spindle
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
- A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
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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
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
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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
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
- A61B17/7008—Longitudinal elements, e.g. rods with a cross-section which varies along its length with parts of, or attached to, the longitudinal elements, bearing against an outside of the screw or hook heads, e.g. nuts on threaded rods
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- A—HUMAN NECESSITIES
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- 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
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
-
- A—HUMAN NECESSITIES
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- 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
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
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- A—HUMAN NECESSITIES
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- 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
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- 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
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
- A61F2002/30153—Convex polygonal shapes rectangular
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- 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
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
- A61F2002/30156—Convex polygonal shapes triangular
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- A—HUMAN NECESSITIES
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- 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
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
- A61F2002/30158—Convex polygonal shapes trapezoidal
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- A—HUMAN NECESSITIES
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- 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
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30224—Three-dimensional shapes cylindrical
- A61F2002/30233—Stepped cylinders, i.e. having discrete diameter changes
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- A—HUMAN NECESSITIES
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- 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
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30261—Three-dimensional shapes parallelepipedal
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
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- 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
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- A61F2002/30411—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves having two threaded end parts connected by a threaded central part with opposite threads at its opposite ends, i.e. for adjusting the distance between both end parts by rotating the central part
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- 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
- A61F2230/0069—Three-dimensional shapes cylindrical
-
- 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
- A61F2230/0082—Three-dimensional shapes parallelepipedal
-
- 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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0004—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
- A61F2250/0006—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting angular orientation
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
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- Oral & Maxillofacial Surgery (AREA)
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- Prostheses (AREA)
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Description
Die Erfindung betrifft ein Zwischenwirbelimplantat mit zwei
einen Abstand zueinander aufweisenden Seitenwänden, einer
diese an ihrem einen Ende verbindenden Vorderwand, einer diese
an ihrem gegenüberliegenden anderen Ende verbindenden Rückwand
und je einer Öffnung auf den sich quer zu den vorgenannten
Wänden erstreckenden Boden- und Deckflächen.
Ein solches Implantat wird nach der Entfernung einer Band
scheibe eingesetzt, um den Zwischenwirbelraum zu stabilisie
ren, bis das gleichzeitig eingebrachte Knochenmaterial zu
einer knöchernen Durchbauung und Versteifung geführt hat.
Ein Zwischenwirbelimplantat ist aus der DE 195 29 605 C2
bekannt. Das Implantat weist zwei zunächst in einen Hohlraum
zurückgebogene hakenförmige Abschnitte auf, die durch Ein
schrauben einer einen kegelförmigen Abschnitt aufweisenden
Schraube nach Einsetzen des Implantates zwischen zwei Wirbel
körper nach außen in eine Greifstellung bewegt werden. Ein
Nachteil dieser Vorrichtung besteht darin, daß die die Greifer
aufweisenden Arme nicht in ihre zurückgezogene Stellung zu
rückbewegbar sind, so daß ein Verändern der Position des
Implantates durch den Operateur nach dem ersten Ausfahren der
Greifer nicht mehr möglich ist.
Aus der DE 195 49 426 C2 ist ein Zwischenwirbelimplantat be
kannt, bei dem zwei Endabschnitte eines Hohlkörpers durch Ein
setzen einer einen kegelstumpfförmigen Abschnitt aufweisenden
Schraube diese aus einer zunächst zusammengebogenen Stellung
in eine auseinandergedrückte Stellung bewegt werden. Auf der
Außenseite vorgesehene Zacken greifen in der auseinanderge
drückten Stellung in die benachbarten Wirbelkörper ein. Auch
hier besteht der Nachteil, daß nach dem erstmaligen Auseinan
derdrücken und Eingreifen der Zacken in die benachbarten Wir
belkörper keine Rückführung zum Ersetzen oder Nachjustieren
möglich ist.
Aufgabe der Erfindung ist es, ein verbessertes Zwischenwir
belimplantat der eingangs beschriebenen Art zu schaffen.
Diese Aufgabe wird durch das im Patentanspruch 1 gekennzeich
nete Zwischenwirbelimplantat gelöst.
Weiterbildungen der Erfindung sind in den Unteransprüchen
gekennzeichnet.
Das erfindungsgemäße Zwischenwirbelimplantat hat den Vorteil,
daß es in einem Zustand mit im wesentlichen glatten Außenflä
chen in die Wirbelsäule eingebracht werden kann, um Verletzun
gen der Weichteile zu verhindern und um leicht in die passende
Stellung in dem Zwischenwirbelraum geführt werden zu können.
Wenn das Implantat eingesetzt ist, können Elemente mit Zacken
bzw. Spitzen in kontrollierter Art und Weise vom Operateur aus
dem Implantatkörper herausgefahren werden, um sich in den End
platten der Wirbelkörper zu verkrallen und somit das Implantat
zu fixieren.
Das bezüglich des Hubes justierbare Ausfahren und Einfahren
der Zacken ermöglicht ein individuelles Anpassen an die
jeweilige anatomische Form der Wirbelendplatten. Zudem kann
durch die Justierung der Zackenhöhe der Abstand der Wirbel
zueinander kontrolliert werden. Das Implantat hat ferner den
Vorteil, daß es nachträglich wieder entfernt werden kann,
falls dies erforderlich ist.
Weitere Merkmale und Zweckmäßigkeiten der Erfindung ergeben
sich aus der Beschreibung eines Ausführungsbeispieles anhand
der Figuren. Von den Figuren zeigen:
Fig. 1 eine perspektivische Ansicht des Zwischenwirbelim
plantates in Explosionsdarstellung;
Fig. 2 einen Teil einer Wirbelsäule mit dem eingesetzten
Zwischenwirbelimplantat in Seitenansicht;
Fig. 3 ein Detail aus Fig. 2 in vergrößertem Maßstab;
Fig. 4 eine Draufsicht auf das Zwischenwirbelimplantat;
Fig. 5 eine Seitenansicht des Zwischenimplantats;
Fig. 6 eine stirnseitige Ansicht des Zwischenwirbelimplan
tats;
Fig. 7 eine Schnittansicht durch das Zwischenwirbelimplan
tat entlang der Linie IV-IV von Fig. 6 mit den
Zacken in zurückgezogener Position; und
Fig. 8 eine Schnittansicht durch das Zwischenwirbelimplan
tat entlang der Linie IV-IV von Fig. 6 mit den
Zacken in hervorstehender Position.
Wie am besten aus den Fig. 1 und 4 bis 6 ersichtlich ist,
weist das Implantat eine erste Seitenwand 1, eine dieser in
einem Abstand gegenüberliegende zweite Seitenwand 2 und eine
die beiden Seitenwände 1, 2 an ihrem einen Ende verbindende
Vorderwand 3 sowie eine dieser gegenüberliegende Rückwand 4
zum Verbinden der beiden Seitenwände an ihren
gegenüberliegenden Enden auf. Die Boden- und Deckflächen sind,
wie am besten aus Fig. 1 ersichtlich ist, offen, so daß die
vier Wände einen oben und unten offenen Hohlraum 5
umschließen. Die beiden Seitenwände 1 und 2 weisen, wie am
besten aus Fig. 5 ersichtlich ist, eine Mehrzahl von über die
Wandflächen verteilte Ausnehmungen 6 auf, die vorzugsweise
rhombenartig ausgeführt sind.
Wie am besten aus den Fig. 1 und 6 bis 8 ersichtlich ist,
ist in der Vorderwand 3 und der Rückwand 4 in der Mitte zwi
schen den Seitenwänden jeweils eine koaxial zu der jeweils
anderen Bohrung ausgerichtete Bohrung 7, 7' vorgesehen. Der
Mittelpunkt 8 der Bohrung 7, 7' befindet sich jeweils in
gleichem Abstand von dem oberen bzw. unteren Rand 9, 9' des
Implantats und somit im Zentrum der Vorder- bzw. Rückwand. Die
Bohrung 7, 7' weist einen ersten an der Außenseite der Vorder-
bzw. Rückwand gelegenen Bereich 10 mit einem ersten
Durchmesser auf und einen daran angrenzenden in den Hohlraum 5
mündenden zweiten Bereich 11 mit einem zweiten Durchmesser
auf, wobei der zweite Durchmesser etwas kleiner ist als der
erste Durchmesser. Dadurch bildet der zweite Bereich 11 eine
Schulter.
Jede Seitenwand 1, 2 weist in etwa mittig zwischen der Vorder-
und Rückwand angeordnet und in einem Abstand von dem oberen
und unteren freien Rand 9, 9' des Implantats vorgesehene Boh
rungen 12, 13 bzw. 12', 13' auf, wobei jeweils gegenüberlie
gende Bohrungen 12, 12' bzw. 13, 13' der Seitenwände 1, 2 ko
axial zueinander sind.
In das Paar koaxialer Bohrungen 7, 7' ist, wie am besten aus
den Fig. 1 und 7 und 8 ersichtlich ist, eine Gewindespindel
15 eingesetzt. Die Gewindespindel 15 weist ein erstes Ende 16
und ein diesem gegenüberliegendes zweites Ende 17 auf. Zwi
schen dem ersten Ende 16 und dem zweiten Ende 17 ist ein sich
jeweils von in einem Abstand von dem ersten Ende 16 bis knapp
zur Mitte 20 der Gewindespindel erstreckender erster Gewinde
abschnitt 18 und ein sich in einem Abstand vom zweiten Ende 17
bis knapp zur Mitte 20 der Gewindespindel erstreckender zwei
ter Gewindeabschnitt 19 vorgesehen. Die Gewindesteigung des
ersten Gewindeabschnittes 18 ist entgegengesetzt zu der Gewin
desteigung des zweiten Gewindeabschnittes 19. Angrenzend an
das erste Ende 16 bzw. das zweite Ende 17 weist die Gewinde
spindel jeweils einen ersten Sechskant 21 bzw. einen zweiten
Sechskant 22 auf.
Wie insbesondere aus den Fig. 6 bis 8 ersichtlich ist, ist
jedes Ende 16, 17 der Gewindespindel 15 in ein entsprechendes
Lagerelement (bzw. einen Lagerzapfen) 25, 26 drehfest
eingeführt, welches seinerseits jeweils in den Bohrungen 7, 7'
drehbar gelagert ist und dessen Außenfläche mit der Vorder-
bzw. Rückwand bündig abschließt. Jedes Lagerelement 25, 26 ist
als Teil mit einem ersten zylinderförmigen Abschnitt 27, 27'
mit einem ersten Außendurchmesser und einem daran angrenzenden
zylinderförmigen zweiten Abschnitt 29, 29' mit einem zweiten
Außendurchmesser, wobei der zweite Außendurchmessern größer als
der erste Außendurchmesser ist, ausgebildet. Dadurch bildet
der zweite Abschnitt 29, 29' jeweils einen über den ersten
Abschnitt 27, 27' hervorstehenden ringförmigen Ansatz. Die
Durchmesser der ersten und zweiten Abschnitte sind so gewählt,
daß das Lagerelement 25 bzw. 26 in die Bohrung 7, 7' der
Vorder- bzw. Rückwand einschiebbar ist, und daß in
eingeschobenem Zustand der durch den zweiten Bereich gebildete
Ansatz des Lagerteils auf der Schulter der Bohrung 7, 7'
aufliegt. Der erste Abschnitt 27 bzw. 27' des Lagerteiles 25
bzw. 26 weist eine sich von dem dem zweiten Abschnitt 29 bzw.
29' gegenüberliegenden Ende in das Innere des zylinderförmigen
Abschnittes 27 bzw. 27' erstreckende Sechskantbohrung 34 bzw.
34' auf, deren Längsabmessung der Abmessung des Endabschnittes 21
bzw. 22 der Gewindespindel 15 entspricht und in die auch
die Endbereiche 21 bzw. 22 der Gewindespindel 15 jeweils
paßgenau eingeführt sind. Von dem jeweils gegenüberliegenden
Ende eines jeden Lagerteils 25, 26 erstreckt sich eine
koaxiale Sechskantbohrung 38, 38' in Richtung des ersten
Abschnittes 27, 27' zum Ineingriffbringen mit einem Sechskant-
Schraubendreher. Dadurch wird ermöglicht, daß ein Operateur
von beiden Seiten an das Implantat herankommt und dieses
justieren kann.
Wie insbesondere aus den Fig. 1, 7 und 8 ersichtlich ist,
befindet sich auf jedem Gewindeabschnitt 18, 19 der Gewinde
spindel 15 ein keilförmiges Element 45 bzw. 46. Das keilför
mige Element 45 bzw. 46 ist jeweils begrenzt von einer Vorder
fläche 47, 47' und einer Rückfläche 48, 48' mit rechteckigem
Querschnitt, die parallel zueinander und senkrecht zur Spin
delachse verlaufen, wobei die Vorderfläche 47, 47' einen klei
neren Querschnitt aufweist als die Rückfläche 48, 48'. Vorder
fläche und Rückfläche sind über zwei einander gegenüberlie
gende trapezförmige Seitenflächen 49, 49' und jeweils eine
Deck- bzw. Bodenfläche 51, 51' bzw. 52, 52' mit rechteckigem
Querschnitt verbunden, wodurch ein Keil gebildet ist.
Das keilförmige Element 45 weist eine jeweils durch die Mitte
der Vorder- und Rückfläche hindurchgehende Gewindebohrung 55
mit einem dem Außengewinde des Gewindeabschnitts 18 der Gewin
despindel 15 entsprechenden Innengewinde auf. Das keilförmige
Element 46 weist ebenfalls eine durch die Mitte der Vorder-
und Rückfläche hindurchgehende Gewindebohrung 55 mit einem dem
Außengewinde des Gewindeabschnitts 19 der Gewindespindel 15
entsprechenden Innengewinde auf. Die keilförmigen Elemente 45
und 46 sind so auf die jeweiligen Gewindeabschnitte 18 bzw. 19
der Gewindespindel 15 aufgeschraubt, daß ihre jeweiligen Deck
flächen 51, 51' und ihre jeweiligen Bodenflächen 52, 52'
gegeneinander zugeneigt sind.
Zwischen die gegeneinander geneigten Deckflächen 51, 51' bzw.
zwischen die gegeneinander geneigten Bodenflächen 52, 52', im
folgenden als Keilflächen bezeichnet, der keilförmigen Ele
mente 45, 46 ist jeweils ein Eingriffsteil 60 bzw. 61 einge
setzt, welches an seiner den Keilflächen zugewandten Seite in
Form eines Dachgiebels mit zwei schräg aufeinander zulaufenden
Flächen 63, 64 bzw. 63', 64' ausgebildet ist. Der Neigungswin
kel der Flächen 63, 64 bzw. 63', 64' entspricht dem Keilwinkel
der Keilflächen. An seiner der Gewindespindel 15 abgewandten
Seite weist jedes Eingriffsteil 60 bzw. 61 eine Oberfläche mit
rechteckigem Umriß auf, in der eine quer zu den Längsseiten
und mittig angeordnete zylinderabschnittsförmige Ausnehmung 67
vorgesehen ist. Zu beiden Seiten der zylinderabschnitts
förmigen Ausnehmung 67, 67' erstrecken sich in die der
Gewindespindel 15 abgewandten Richtung Zacken 68, die jeweils
auf dem Umriß eines Quadrates angeordnet sind, wie
insbesondere aus Fig. 1 und Fig. 4 ersichtlich ist. Zwischen
den Zacken befindet sich jeweils eine in etwa kreisförmige
Vertiefung 69, so daß die auf dem Umriß eines Quadrates
angeordneten Zacken jeweils einen Zackenkranz bilden.
In eingesetztem Zustand ist über jedem Eingriffsteil 60, 61
ein Stab 70, 71 mit einem Durchmesser, der etwas geringer ist
als der Durchmesser der zylinderabschnittsförmigen Ausnehmung
67, 67' vorgesehen, der jeweils durch gegenüberliegende Boh
rungen 12, 12' bzw. 13, 13' der Seitenwände 1, 2 des Implan
tats hindurchgeführt und in diesen vernietet ist. Das Ein
griffsteil 60, 61 wird somit am Herausfallen aus dem Hohlraum
5 gehindert, da der Stab 70, 71 jeweils in die zylinderab
schnittsförmige Ausnehmung 67, 67' des jeweiligen Eingriffstei
les 60, 61 eingreift. Damit bildet jeder Stab 70, 71 einen An
schlag für eine Bewegung des Eingriffsteiles 60, 61 aus dem
Hohlraum 5 heraus und bildet gleichzeitig eine Achse, um die
das Eingriffsteil in der ausgefahrenen Stellung drehbar
gelagert ist.
Die Abmessungen der keilförmigen Elemente 45, 46 der Gewinde
abschnitte 18, 19 der Spindel 15 und der Eingriffsteile 60,
61, sowie die Steigung der Gewinde ist so gewählt, daß die
Eingriffsteile 60, 61 von einer ersten Stellung, die in Fig. 8
gezeigt ist, in der die Zacken über den jeweiligen Rand 9, 9'
des Implantats hinausragen in eine zweite Stellung, die in
Fig. 7 dargestellt ist, in der sich die Zacken 68 unterhalb
des Randes 9, 9' befinden, und vice versa bewegt werden kön
nen.
Das Implantat ist bevorzugt aus einem körperfreundlichen Mate
rial wie beispielsweise Titan gefertigt.
Im Betrieb werden mit einem Sechskant-Schraubendreher zunächst
die keilförmigen Elemente 45, 46 durch Drehen der Gewindespin
del 15 in die in Fig. 7 gezeigte Stellung gebracht, bei der
die Rückflächen 48 an der dem Hohlraum 5 zugewandten Seite der
Vorder- bzw. Rückwand 3, 4 des Implantates anliegen. Dadurch
befindet sich jedes Eingriffsteil 60, 61 in seiner tiefsten
Stellung, in der die Zacken 68 nicht über den Rand des Implan
tates hinausragen. Damit ist das Implantat leicht in den Raum
zwischen die Wirbel einführbar und es besteht keine Gefahr von
Verletzungen der Weichteile oder der Wirbelendplatten. Wenn
das Implantat in seiner Stellung zwischen den Wirbeln richtig
positioniert ist, werden durch Drehen der Gewindespindel 15
mittels eines Sechskant-Schraubendrehers die beiden keilförmi
gen Elemente 45, 46 aufeinander zu bewegt, wodurch über die
keilförmig gegeneinander geneigten Flächen jeweils eine Kraft
auf die schrägen Flächen 63, 64 bzw. 63', 64' des jeweiligen
Eingriffsteiles ausgeübt wird und dieses angehoben wird, bis
die Zacken 68 über den Rand des Implantates hervorstehen und
sich dadurch in dem Wirbelkörper verkrallen können, wie insbe
sondere in Fig. 2 und Fig. 3 dargestellt ist. Das Ausfahren
der Eingriffsteile 60, 61 ist durch den über den Stab 70, 71
gebildeten Anschlag auf eine in Fig. 8 dargestellte Hubhöhe
begrenzt, in der die Zacken 68 des jeweiligen Eingriffsteiles
über den Rand des Implantates hervorstehen.
Durch das Übersetzen der Drehbewegung des Werkzeugs mittels
der Gewindespindel und den keilförmigen Elementen ist eine
feindosierte Einstellung des Hubes der Eingriffsteile und da
mit ein individuelles Anpassen des Implantats an die
anatomische Form der Wirbelendplatten des einzelnen Patienten
möglich.
Die Ausbildung des Anschlages für die Eingriffsteile 60, 61 in
Form des in die zylinderabschnittsförmige Ausnehmung 67
eingreifenden Stabes 70, 71 sind die Eingriffsteile 60, 61 in
ihrer obersten Stellung drehbar um den jeweilige Stab 70, 71
gelagert. Dies ermöglicht eine selbständige Zentrierung der
Eingriffsteile, indem die mit Zacken 68 besetzte Oberfläche
der anatomischen Form der jeweiligen Endplatte des Wirbelkör
pers folgt. Ein selbständiges Lösen der Eingriffsteile ist
aufgrund der Gewindespindel nicht möglich. Nur durch Zurück
drehen mittels des Instrumentes können die Eingriffsteile 60,
61 zurückgefahren werden, wobei der Druck, der von den Wirbeln
auf die Eingriffsteile ausgeübt wird, diese in den Implantat
hohlraum 5 drückt. Damit können die Zacken wieder aus der Wir
belkörperendplatte gelöst werden.
Abwandlungen der Vorrichtung sind möglich. Beispielsweise
können anstatt der Zacken 68 Spitzen oder jede andere Oberflä
chenstruktur, die ein Eingreifen in Knochenmaterial erlaubt,
vorgesehen sein.
Claims (13)
1. Zwischenwirbelimplantat mit
zwei einen Abstand zueinander aufweisenden Seitenwänden (1,
2), einer diese an ihrem einen Ende verbindenden Vorderwand
(3), einer diese an ihrem gegenüberliegenden anderen Ende
verbindenden Rückwand (4) und je einer Öffnung auf den sich
quer zu den vorgenannten Wänden erstreckenden Boden- und
Deckflächen, gekennzeichnet durch
wenigstens ein in dem von den vorgenannten Wänden
umschlossenen Raum (5) vorgesehenen Element (60, 61) mit einer
zur Deckfläche bzw. Bodenfläche gerichteten Oberfläche,
welches zwischen einer ersten Endstellung, in der die
Oberfläche über die Boden- bzw. Deckfläche wenigstens
teilweise nach außen hervorsteht und einer zweiten
Endstellung, in der die Oberfläche nicht über die Boden- bzw.
Deckfläche hervorsteht, hin- und herbewegbar ist.
2. Zwischenwirbelimplantat nach Anspruch 1, dadurch
gekennzeichnet, daß die Oberfläche des Teiles (60, 61) eine
Struktur (68) aufweist, die ein Eindringen in benachbartes
Knochenmaterial ermöglicht.
3. Zwischenwirbelimplantat nach Anspruch 1 oder 2, dadurch ge
kennzeichnet, daß die Oberfläche Zacken (68) aufweist, die in
der ersten Endstellung über die Boden- bzw. Deckfläche
hervorstehen und in der zweiten Endstellung nicht darüber
hervorstehen.
4. Zwischenwirbelimplantat nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß ein Anschlag (70, 67; 71, 67') für
die Bewegung des Teiles vorgesehen ist, der die erste
Endstellung definiert.
5. Zwischenwirbelimplantat nach Anspruch 4, dadurch
gekennzeichnet, daß der Anschlag durch eine quer durch die
Öffnung in der Boden- bzw. Deckfläche vorgesehene Welle (70,
71) gebildet wird, um die das Teil (60, 61) in der ersten
Endstellung drehbar gelagert ist.
6. Zwischenwirbelimplantat nach einem der Ansprüche 1-5, da
durch gekennzeichnet, daß zwei Teile (60, 61) vorgesehen sind,
die derart miteinander gekoppelt sind, daß sie beim Verstellen
in die erste Endstellung voneinander wegbewegt werden, so daß
die Oberfläche des einen Teiles (60) durch die Öffnung in der
Bodenfläche und die Oberfläche des anderen Teiles (61) durch
die Öffnung in der Deckfläche bewegt werden.
7. Zwischenwirbelimplantat nach Anspruch 6, dadurch
gekennzeichnet, daß in dem von den Wänden umschlossenen Raum
(5) eine Gewindespindel (15) mit zwei Abschnitten (18, 19) mit
entgegengesetzter Gewindesteigung vorgesehen ist, die mit
ihrem einen Ende (16) in der Vorderwand und mit dem anderen
Ende (17) in der Rückwand drehbar gelagert ist und auf der
zwei keilförmige Elemente (45, 46) derart gelagert sind, daß
beim Drehen der Gewindespindel in eine Richtung die gegen
einander geneigten Keilflächen (51, 51'; 52, 52') der Elemente
aufeinander zu bewegt werden und beim Drehen der
Gewindespindel in eine entgegengesetzte Richtung die
Keilflächen voneinander weg bewegt werden.
8. Zwischenwirbelimplantat nach Anspruch 7, dadurch
gekennzeichnet, daß die Teile an ihrer der Oberfläche
abgewandten Seite jeweils zwei dachgiebelförmig sich
schneidende Flächen (63, 64; 63', 64') aufweisen mit einem
Neigungswinkel, der dem Keilwinkel der Keilelemente
entspricht, und daß beim Bewegen der Keilelemente die schrägen
Flächen des jeweiligen Teils in Eingriff mit den Keilflächen
der Keilelemente stehen.
9. Zwischenwirbelimplantat nach Anspruch 7 oder 8, dadurch ge
kennzeichnet, daß in der Vorder- und der Rückwand jeweils eine
Ausnehmung (38, 38') vorgesehen ist, über die die
Gewindespindel mit einem Werkzeug drehbar ist.
10. Zwischenwirbelimplantat nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, daß die Seitenwände jeweils eine
Ausnehmung (6) aufweisen.
11. Zwischenwirbelimplantat nach Anspruch 10, dadurch
gekennzeichnet, daß eine Mehrzahl über die Wandflächen
verteilte, rautenförmige Ausnehmungen (6) vorgesehen sind.
12. Zwischenwirbelimplantat nach einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet, daß die Seitenwände (1, 2) im
wesentlichen trapezförmig ausgebildet sind, so daß ein
keilabschnittsförmiger Körper gebildet ist.
13. Zwischenwirbelimplantat nach einem der Ansprüche 1 bis 12,
dadurch gekennzeichnet, daß das Implantat aus einem körperver
träglichen Material gebildet ist.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19807236A DE19807236C2 (de) | 1998-02-20 | 1998-02-20 | Zwischenwirbelimplantat |
TW088213126U TW390200U (en) | 1998-02-20 | 1999-01-22 | Intervertebrae implant |
AT99910246T ATE232374T1 (de) | 1998-02-20 | 1999-02-19 | Zwischenwirbelimplantat |
EP99910246A EP0977529B1 (de) | 1998-02-20 | 1999-02-19 | Zwischenwirbelimplantat |
KR1019997009659A KR20010012068A (ko) | 1998-02-20 | 1999-02-19 | 척추 삽입물 |
DE59904262T DE59904262D1 (de) | 1998-02-20 | 1999-02-19 | Zwischenwirbelimplantat |
JP54213899A JP3522288B2 (ja) | 1998-02-20 | 1999-02-19 | 椎間インプラント |
PCT/EP1999/001099 WO1999042062A1 (de) | 1998-02-20 | 1999-02-19 | Zwischenwirbelimplantat |
US09/403,125 US6176882B1 (en) | 1998-02-20 | 1999-02-19 | Intervertebral implant |
CN99800334A CN1262607A (zh) | 1998-02-20 | 1999-02-19 | 椎间植入物 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19807236A DE19807236C2 (de) | 1998-02-20 | 1998-02-20 | Zwischenwirbelimplantat |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19807236A1 true DE19807236A1 (de) | 1999-09-09 |
DE19807236C2 DE19807236C2 (de) | 2000-06-21 |
Family
ID=7858450
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19807236A Expired - Lifetime DE19807236C2 (de) | 1998-02-20 | 1998-02-20 | Zwischenwirbelimplantat |
DE59904262T Expired - Lifetime DE59904262D1 (de) | 1998-02-20 | 1999-02-19 | Zwischenwirbelimplantat |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE59904262T Expired - Lifetime DE59904262D1 (de) | 1998-02-20 | 1999-02-19 | Zwischenwirbelimplantat |
Country Status (9)
Country | Link |
---|---|
US (1) | US6176882B1 (de) |
EP (1) | EP0977529B1 (de) |
JP (1) | JP3522288B2 (de) |
KR (1) | KR20010012068A (de) |
CN (1) | CN1262607A (de) |
AT (1) | ATE232374T1 (de) |
DE (2) | DE19807236C2 (de) |
TW (1) | TW390200U (de) |
WO (1) | WO1999042062A1 (de) |
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- 1999-02-19 CN CN99800334A patent/CN1262607A/zh active Pending
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- 1999-02-19 EP EP99910246A patent/EP0977529B1/de not_active Expired - Lifetime
- 1999-02-19 DE DE59904262T patent/DE59904262D1/de not_active Expired - Lifetime
- 1999-02-19 KR KR1019997009659A patent/KR20010012068A/ko not_active Application Discontinuation
- 1999-02-19 JP JP54213899A patent/JP3522288B2/ja not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
JP3522288B2 (ja) | 2004-04-26 |
JP2000513263A (ja) | 2000-10-10 |
US6176882B1 (en) | 2001-01-23 |
WO1999042062A1 (de) | 1999-08-26 |
TW390200U (en) | 2000-05-11 |
DE59904262D1 (de) | 2003-03-20 |
EP0977529A1 (de) | 2000-02-09 |
KR20010012068A (ko) | 2001-02-15 |
CN1262607A (zh) | 2000-08-09 |
EP0977529B1 (de) | 2003-02-12 |
ATE232374T1 (de) | 2003-02-15 |
DE19807236C2 (de) | 2000-06-21 |
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