DE19504867C1 - Platzhalter, insbesondere für einen Wirbel bzw. eine Bandscheibe - Google Patents

Platzhalter, insbesondere für einen Wirbel bzw. eine Bandscheibe

Info

Publication number
DE19504867C1
DE19504867C1 DE19504867A DE19504867A DE19504867C1 DE 19504867 C1 DE19504867 C1 DE 19504867C1 DE 19504867 A DE19504867 A DE 19504867A DE 19504867 A DE19504867 A DE 19504867A DE 19504867 C1 DE19504867 C1 DE 19504867C1
Authority
DE
Germany
Prior art keywords
placeholder
edge
jacket
placeholder according
plate
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.)
Expired - Lifetime
Application number
DE19504867A
Other languages
English (en)
Inventor
Juergen Prof Dr Harms
Lutz Biedermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19504867A priority Critical patent/DE19504867C1/de
Priority to AT95120302T priority patent/ATE171857T1/de
Priority to EP95120302A priority patent/EP0727196B1/de
Priority to DE59503854T priority patent/DE59503854D1/de
Priority to ES95120302T priority patent/ES2124489T3/es
Priority to US08/581,149 priority patent/US5702451A/en
Priority to CA002169233A priority patent/CA2169233A1/en
Priority to JP08023671A priority patent/JP3089201B2/ja
Priority to KR1019960003409A priority patent/KR100395192B1/ko
Application granted granted Critical
Publication of DE19504867C1 publication Critical patent/DE19504867C1/de
Priority to US08/936,403 priority patent/US5972031A/en
Priority to US09/386,885 priority patent/US20010014826A1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30721Accessories
    • A61F2/30744End caps, e.g. for closing an endoprosthetic cavity
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • AHUMAN NECESSITIES
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    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
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    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
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    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
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    • A61F2220/0033Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
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    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
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    • A61F2230/0069Three-dimensional shapes cylindrical

Description

Die Erfindung betrifft einen Platzhalter nach dem Oberbegriff des Patentanspruches 1.
Ein solcher Platzhalter ist beispielsweise aus der EP 0 268 115 B1 bekannt. Dieser weist auf seiner Innenseite in einem Abstand von dem jeweiligen freien Ende des Mantels einen durch einen Ring gebildeten Anschlag auf. Der Ring ist mittels Schrauben mit dem Mantel verbunden. In einer besonderen Ausfüh­ rungsform ist auf dem Ring eine Durchbrechungen aufweisende Bo­ denplatte aufgebracht.
Aufgabe der Erfindung ist es, den Platzhalter einfacher und gleichzeitig universeller auszugestalten.
Diese Aufgabe wird durch den in Patentanspruch 1 gekennzeichne­ ten Platzhalter gelöst.
Ausführungsformen der Erfindung sind in den Unteransprüchen ge­ kennzeichnet.
Weitere Einzelheiten und Zweckmäßigkeiten der Erfindung ergeben sich aus der Beschreibung von Ausführungsbeispielen anhand der Figuren. Von den Figuren zeigen:
Fig. 1 eine Seitenansicht des Mantels des Platzhalters;
Fig. 2 eine Draufsicht auf eine erste Ausführungsform des mit dem Mantel zu verbindenden Elementes;
Fig. 3 eine Draufsicht auf eine zweite Ausführungsform des Elementes;
Fig. 3a einen Schnitt entlang der Linie III-III in Fig. 3;
Fig. 4 eine Draufsicht auf eine dritte Ausführungsform des Elementes;
Fig. 5 eine Schnittdarstellung einer Seitenansicht entlang der Linie V-V in Fig. 4;
Fig. 6 eine Schnittdarstellung entlang der Linie VI-VI in Fig. 7 durch eine weitere abgewandelte Ausführungsform;
Fig. 7 eine Draufsicht auf diese Ausführungsform;
Fig. 8 eine Schnittdarstellung entlang der Linie VIII-VIII in Fig. 9;
Fig. 9 eine Draufsicht auf diese weitere Ausbildungsform;
Fig. 10 eine Schnittdarstellung entlang der Linie VIII-VIII in Fig. 11; und
Fig. 11 eine Draufsicht auf diese weitere Ausbildungsform.
Wie insbesondere aus Fig. 1 ersichtlich ist, weist der Platzhal­ ter einen geschlossenen Mantel 1 auf. Der sich senkrecht zur Längsachse 2 des Mantels 1 erstreckende Querschnitt ist in bekannter Weise insbesondere zylindrisch oder oval oder nieren­ förmig ausgebildet. Der Mantel 1 weist in der aus Fig. 1 ersichtlichen Weise sich mit ihrer Längsdiagonale parallel zur Mantelachse 2 erstreckende rautenförmige Ausnehmungen 3, 4 auf. Jeweils benachbarte Reihen 3, 4 solcher Rauten sind gegeneinan­ der um eine halbe Rautenhöhe versetzt. Dadurch wird ein Netz von sich unter einem spitzen Winkel schneidenden Bandstreifen 5, 6 gebildet, die unter jeweils gleich großen Winkeln gegen die Längsdiagonale der Rauten 3, 4 geneigt sind. Der obere Rand 7 und der untere Rand 8 erstrecken sich jeweils in einer Ebene senk­ recht zu der Längsachse 2. Die Größe der Rauten 3, 4 und der diese begrenzende Bandstreifen 5, 6 ist so gewählt, daß die Anzahl von Rauten in Umfangsrichtung stets ganzzahlig ist. Durch das Bilden der Ränder 7, 8 ergibt sich in Umfangsrichtung stets eine gerade Anzahl von durch den jeweiligen Rautengrund gebilde­ ten V-förmigen Vertiefungen 9, 10 bzw. 9′, 10′. Aufgrund der wie oben beschrieben gewählten Geometrie weist der jeweilige Rand quasi eine zu einem Punkt auf der Längsachse 2, der in der Ebene des Randes liegt, bestehende Punktsymmetrie auf.
Das in Fig. 2 gezeigte erste Ausführungsbeispiel eines einen Anschlag bildenden Elementes 11 ist als ein plattenförmiger Ring ausgebildet. Der Ring 12 entspricht in seiner Außenkontur der Innenkontur des Mantels 1. Seine Abmessungen sind so gewählt, daß er sich in das Innere des Mantels hineindrücken, gewünschtenfalls aber auch wieder herausdrücken läßt, also durch Reibsitz mit dem Mantel 1 verbunden ist. An dem Außenrand des Ringes 12 sind in Umfangsrichtung äquidistant verteilt hervorspringende Stege 15 vorgesehen. Der Abstand zweier Stege in Umfangsrichtung ist gleich dem Abstand zweier in Umfangsrichtung aufeinander folgender V-förmiger Vertiefungen 9, 10. Die Querabmessungen der Stege 15 in der Plattenebene sind so bemessen, daß die Stege gut in den Grund der V-förmigen Ausnehmungen 9, 10 hineinpassen. Die Länge der hervorstehenden Stege entspricht in etwa der Wanddicke des zugehörigen Mantels.
Im Fall der Anwendung wird der Mantel 1 durch Abtrennen des obe­ ren Randes 7 und des unteren Randes 8 auf die gewünschte Länge gebracht. Dann wird ein Ring 12 auf der Oberseite und ein zwei­ ter Ring auf der unteren Seite so in das Mantelinnere gedrückt, daß der jeweilige Ring mit seinen Stegen 15 in den jeweiligen Grund der zugehörigen V-förmigen Vertiefung 9, 10 bzw. 9′, 10′ liegt.
Aufgrund der Tatsache der ganzzahligen Anzahl der V-förmigen Vertiefungen und der sich daraus ergebenden Punktsymmetrie kann ein und dasselbe Element 11 verwendet werden, unabhängig davon, ob die Abtrennung an dem Rand 7 oder an dem gestrichelt angedeu­ teten darunterliegenden Rand 7′ erfolgt. Wird der Rand nicht an der Stelle 7 sondern an der Stelle 7′ gebildet, wird der Ring 12 einfach um seine Längsachse gedreht eingesetzt, so daß die La­ gerhaltung vereinfacht wird und andererseits auch die Handhabung mehr einfach ist, weil nur eine Art von Ringen zum Einsatz kommt.
Fig. 3 zeigt ein Element 13 einer abgewandelten Ausführungsform. Auch hier handelt es sich um eine Platte, bei der die Ausnehmun­ gen durch in der Platte verteilte lochförmige Ausnehmungen 14 gebildet sind. In allen übrigen Merkmalen stimmt das Element mit dem Element 11 überein.
Die Fig. 4 und 5 zeigen ein Element 16 einer dritten Ausfüh­ rungsform. Dieses Element weist zunächst wiederum eine Platte auf, die mit der in Fig. 3 gezeigten Ausführungsform bezüglich ihrer Ausnehmungen 14 und ihrer Stege 15 identisch ist. Um die Platte herum ist ein Außenring 17 angeordnet. Dieser erstreckt sich in der am besten aus Fig. 5 ersichtlichen Weise mit seiner Ringwandung senkrecht zur Plattenebene und damit parallel zur äußeren Oberfläche des Mantels 1. Die Länge der Stege 15 ist so gewählt, daß diese gerade um so viel länger als die Dicke des Mantels 1 ist, daß der dadurch zwischen Platte, Stegen und Ring gebildete Zwischenraum 18 ein Aufschieben des Elementes auf das jeweilige freie Ende 7, 8 des Mantels 1 dahingehend, daß die Stege 15 in dem Grund der jeweiligen zugehörigen V-förmigen Aus­ nehmungen 9, 10, 9′, 10′ liegen, ermöglicht. Der Ring 17 liegt dann mit seiner inneren Oberfläche an der Außenwand des Mantels 1 an.
In den Fig. 6 und 7 ist ein Element 19 einer weiteren Ausfüh­ rungsform beschrieben. Diese weist einen plattenförmigen Ring 12 auf, der mit dem in Fig. 2 gezeigten Ring identisch ist. Auf einer Oberfläche dieses Ringes ist, wie am besten aus Fig. 6 ersichtlich ist, ein in seiner Außenkontur der Innenkontur des Mantels 1 entsprechender Randabschnitt 20 vorgesehen, dessen der Platte 12 abgewandter freier Rand in Umfangsrichtung äquidistant angeordnete Zacken 21 aufweist. Die Höhe der Zacken 21 über der Platte 12 ist so bemessen, daß die Zacken im eingesetzten Zustand nahezu bis zu ihrem Grund über den Rand 7 bzw. 8 des Mantels 1 hervorstehen.
Die in den Fig. 8 und 9 gezeigte Ausführungsform eines Ele­ mentes 22 unterscheidet sich von der vorher beschriebenen Aus­ führungsform nur dadurch, daß der Zackengrund nicht auf einer Ebene parallel zur Platte 12 sondern in einer Ebene, die geneigt zur Platte 12 ist, liegt. Der von den Zacken gebildete Rand liegt ebenfalls in einer Ebene, die zu der Plattenebene des Rin­ ges 12 geneigt ist. Die Neigung beträgt vorzugsweise 8 bis 10°.
Die in den Fig. 10 und 11 gezeigte Ausführungsform des Elementes 24 unterscheidet sich von der in den Fig. 8 und 9 gezeigten Ausführungsform dadurch, daß der Randabschnitt 20 schräg zu der Plattenebene, d. h. in einem von 90° verschiedenen Winkel zur Plattenebene des Ringes 12, ausgebildet ist.
Im Betrieb werden beide Ausführungsformen, also die Elemente 19 bzw. 22 wie bei den vorher beschriebenen Ausführungsformen in den Mantel eingesetzt, so daß der Ring 12 mit seinen hervorste­ henden Stegen 15 in den tiefsten Ausnehmungen der V-förmigen Vertiefungen 9, 10 ruht und die Zacken über den Mantelrand nach außen hervorstehen. Die Zacken 21 bzw. 21′ können bei der in Fig. 6 und 7 gezeigten Ausführungsform unterschiedlich lang abgeschnitten werden, beispielsweise entlang der gestrichelten Linie 23, so daß ein keilförmiger Einsatz entsteht. In gleicher Weise kann auch der Rand des Elementes 22 so beschnitten werden, daß der vorgegebene Winkel zwischen dem äußeren Rand und dem plattenförmigen Ring 12 verändert wird. Auf diese Weise ist es möglich, mit wenigen Grundelementen Platzhalter mit verschie­ denen Keilwinkeln zu bilden.
Die Außenkontur der jeweiligen Ringe 12 bzw. 13 wird natürlich in Abhängigkeit von der jeweiligen Innenkontur des zugehörigen Mantels bestimmt.
In Abweichung von den oben beschriebenen besonders bevorzugten Ausführungsbeispielen können anstelle der V-Form die Vertiefun­ gen des Randes auch andere Formen haben, etwa U-förmige oder schlitzförmige Vertiefungen.

Claims (15)

1. Platzhalter, insbesondere für einen Wirbel bzw. eine Band­ scheibe, mit einem Ausnehmungen aufweisenden Mantel (1) mit einem ersten und zweiten Rand (7, 8) und in Umfangsrichtung an­ geordneten und zueinander benachbarten sich jeweils in Richtung des anderen Randes erstreckenden Vertiefungen (9, 10; 9′, 10′) und einem an wenigstens einem der Enden in einem Abstand von dem äußeren Rand vorgesehenen Anschlag, dadurch gekennzeichnet, daß der Anschlag durch ein Element (11, 13, 16, 19, 22) gebildet ist, dessen äußere Kontur der inneren Kontur des Mantels (1) entspricht und an dessen Umfang an den den Vertiefungen (9, 10; 9′, 10′) entsprechenden Stellen stegartige Vorsprünge (15) zum Eingreifen in die Vertiefungen vorgesehen sind.
2. Platzhalter nach Anspruch 1, dadurch gekennzeichnet, daß die Vertiefungen als zueinander jeweils einen gleichen Abstand aufweisende V-förmige Ausnehmungen (9, 10; 9′, 10′) ausgebildet sind.
3. Platzhalter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Abmessung des äußeren Umfanges so bemessen ist, daß das Element (11, 13, 16, 19, 22) mit Reibsitz von dem Mantel (1) gehalten ist.
4. Platzhalter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Mantel (1) aus einem Gitter mit rautenförmigen Ausnehmungen (3, 4) gebildet ist.
5. Platzhalter nach Anspruch 4, dadurch gekennzeichnet, daß eine Diagonale der Rauten (3, 4) sich jeweils parallel zur Längsachse (2) des Platzhalters erstreckt.
6. Platzhalter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Element (11, 13, 16) als Platte ausgebildet ist.
7. Platzhalter nach Anspruch 6, dadurch gekennzeichnet, daß die Platte (12) ringförmig ausgebildet ist.
8. Platzhalter nach Anspruch 6, dadurch gekennzeichnet, daß die Platte (13) mehrere einander benachbarte Löcher (14) auf­ weist.
9. Platzhalter nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß die Länge der Stege (15) wenigstens gleich der Wandstärke des Mantels (1) ist.
10. Platzhalter nach Anspruch 9, dadurch gekennzeichnet, daß an den äußeren Enden der Stege (15) ein sich um das Element (13) herum erstreckender Außenring (17) vorgesehen ist, dessen Kontur der Außenkontur des Mantels (1) entspricht.
11. Platzhalter nach Anspruch 10, dadurch gekennzeichnet, daß der Außenring (17) mit den Stegen (15) entlang seiner Mittel­ linie verbunden ist.
12. Platzhalter nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß auf der dem angrenzenden Ende zugewandten Seite des Elementes (19, 22) ein über den freien Rand des Mantels (1) hervorstehender zackenförmiger Rand (21, 21′) vorgesehen ist.
13. Platzhalter nach Anspruch 12, dadurch gekennzeichnet, daß der zackenförmige Rand sich parallel zu der Platte (12) er­ streckt.
14. Platzhalter nach Anspruch 12, dadurch gekennzeichnet, daß der zackenförmige Rand sich schräg zu der Platte (12) erstreckt.
15. Platzhalter nach einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, daß der Rand einer gerade Anzahl äquidistanter Vertiefungen auf­ weist.
DE19504867A 1995-02-14 1995-02-14 Platzhalter, insbesondere für einen Wirbel bzw. eine Bandscheibe Expired - Lifetime DE19504867C1 (de)

Priority Applications (11)

Application Number Priority Date Filing Date Title
DE19504867A DE19504867C1 (de) 1995-02-14 1995-02-14 Platzhalter, insbesondere für einen Wirbel bzw. eine Bandscheibe
AT95120302T ATE171857T1 (de) 1995-02-14 1995-12-21 Platzhalter, insbesondere für einen wirbel bzw. eine bandscheibe
EP95120302A EP0727196B1 (de) 1995-02-14 1995-12-21 Platzhalter, insbesondere für einen Wirbel bzw. eine Bandscheibe
DE59503854T DE59503854D1 (de) 1995-02-14 1995-12-21 Platzhalter, insbesondere für einen Wirbel bzw. eine Bandscheibe
ES95120302T ES2124489T3 (es) 1995-02-14 1995-12-21 Dispositivo de sujecion, especialmente para vertebra o disco.
US08/581,149 US5702451A (en) 1995-02-14 1995-12-29 Space holder, in particular for a vertebra or an intervertebral disk
CA002169233A CA2169233A1 (en) 1995-02-14 1996-02-09 Space holder, in particular for a vertebra or an intervertebral disk
JP08023671A JP3089201B2 (ja) 1995-02-14 1996-02-09 スペースホルダ
KR1019960003409A KR100395192B1 (ko) 1995-02-14 1996-02-13 척추또는추간판용스페이스홀더
US08/936,403 US5972031A (en) 1995-02-14 1997-09-25 Space holder in particular for a vertebra or an intervertebral disk
US09/386,885 US20010014826A1 (en) 1995-02-14 1999-08-31 Space holder, in particular for a vertebra or an intervertebral disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19504867A DE19504867C1 (de) 1995-02-14 1995-02-14 Platzhalter, insbesondere für einen Wirbel bzw. eine Bandscheibe

Publications (1)

Publication Number Publication Date
DE19504867C1 true DE19504867C1 (de) 1996-02-29

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EP0727196B1 (de) 1998-10-07
KR960030900A (ko) 1996-09-17
CA2169233A1 (en) 1996-08-15
ES2124489T3 (es) 1999-02-01
EP0727196A1 (de) 1996-08-21
DE59503854D1 (de) 1998-11-12
US5972031A (en) 1999-10-26
US5702451A (en) 1997-12-30
JPH08238266A (ja) 1996-09-17
US20010014826A1 (en) 2001-08-16
KR100395192B1 (ko) 2004-01-07
ATE171857T1 (de) 1998-10-15
JP3089201B2 (ja) 2000-09-18

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