DE3630863A1 - Bone screw - Google Patents

Bone screw

Info

Publication number
DE3630863A1
DE3630863A1 DE19863630863 DE3630863A DE3630863A1 DE 3630863 A1 DE3630863 A1 DE 3630863A1 DE 19863630863 DE19863630863 DE 19863630863 DE 3630863 A DE3630863 A DE 3630863A DE 3630863 A1 DE3630863 A1 DE 3630863A1
Authority
DE
Germany
Prior art keywords
screw
bone screw
characterized
bone
head
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.)
Withdrawn
Application number
DE19863630863
Other languages
German (de)
Inventor
Curt Dipl Ing Kranz
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.)
MECRON MEDIZINISCHE PRODUKTE GmbH
Original Assignee
MECRON MEDIZINISCHE PRODUKTE GmbH
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 MECRON MEDIZINISCHE PRODUKTE GmbH filed Critical MECRON MEDIZINISCHE PRODUKTE GmbH
Priority to DE19863630863 priority Critical patent/DE3630863A1/en
Publication of DE3630863A1 publication Critical patent/DE3630863A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • 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
    • A61B17/88Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875Screwdrivers, spanners or wrenches
    • 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
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • 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
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B17/8605Heads, i.e. proximal ends projecting from bone
    • A61B17/861Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B31/00Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/02Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
    • F16B31/021Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, 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
    • A61B90/03Automatic limiting or abutting means, e.g. for safety
    • A61B2090/037Automatic limiting or abutting means, e.g. for safety with a frangible part, e.g. by reduced diameter

Abstract

Bone screw with an element for transmitting the turning moment in the region of the head. The element for transmitting the turning moment is separated by an intended breaking point from a head comprising a bearing surface, and the breaking moment of this intended breaking point is smaller than the moment to be transmitted by the remainder of the screw, especially by the screw barrel.

Description

Die Erfindung betrifft eine Knochenschraube der im Ober begriff des Anspruchs 1 angegebenen Art. The invention relates to a bone screw of the preamble of claim 1 indicated type.

Bei den bekannten Knochenschrauben besteht der Nachteil, daß sie möglicherweise beim lmplantieren so fest angezogen werden, daß der Schaft oder ein anderer Teil der Schraube bricht, so daß die Funktion der Schraube nicht mehr ge währleistet ist. In the known bone screw is the disadvantage that they may be so tightened when implanting in that the stem or another part of the screw breaking, so that the function of the screw is no longer ge ensured. Die Schraube muß in diesem Fall ausge fräst werden, was mit der Zerstörung von plötzlichen Knochenbereichen verbunden ist. The screw has to be milled out, in this case, which is associated with the destruction of sudden bone regions. Im übrigen kann im Be reich der Ausfräsung keine weitere Schraube angebracht werden. Moreover, the cutout can be installed rich no more screw in Be.

Der Erfindung liegt die Aufgabe zugrunde, bei Knochen schrauben sicherzustellen, daß die Einschraubmomente einen die Schraube gefährdenden Wert nicht erreichen. The invention has the object of screws ensure that the screw-in does not reach a value hazardous to the screw in bone.

Besonders vorteilhaft ist die Anwendung bei resorbierbarem Implantatmaterial, das spröder ist als die üblicherweise verwendeten Schraubenwerkstoffe. Particularly advantageous is the use in resorbable implant material that is more brittle than the bolt materials commonly used. Da derartige Schrauben nicht wieder herausgedreht werden müssen, da der Werkstoff innerhalb des Körpers absorbiert wird, kann nach dem Ein schrauben auch auf die Drehmomentübertragungselemente ver zichtet werden. Since such screws must not be screwed out again, because the material is absorbed within the body, after which a screw on the torque transmitting elements ver be omitted. Lediglich die Zugkraftkomponenten der Schraube aufnehmende Elemente wie Gewinde und Schrauben kopf müssen erhalten bleiben. Only the tractive force component of the screw-receiving elements such as thread and the screw head must be maintained.

Weiterhin ist mit der erfindungsgemäßen Lösung der gegen über den üblichen und bei Knochenschrauben genormten Innensechskanten der Vorteil verbunden, daß der Quer schnitt des Schraubenkopfes nicht durch die entsprechende Ausnehmung geschwächt ist und damit bei der Dimensionie rung der Schraube nicht auf den verringerten Restquer schnitt des Kopfes im Bereich des Grundes des Innensechs kantes Rücksicht genommen zu werden braucht. Furthermore, with the inventive solution to the usual and standardized for bone screws hexagon edges of advantage, in that the cross did not cut the screw head by the corresponding recess is weakened and so that the screw does not tion to the reduced residual cross in the dimensioning cut of the head region of the base of the hexagon needs to be taken kantes consideration.

Bei einer bevorzugten Weiterbildung des die Drehmoment anschlußmittel enthaltenden von der übrigen Schraube durch eine Sollbruchstelle abgetrennten Ansatzes ist die ser bevorzugt derart ballig ausgebildet, daß das Ein schraubwerkzeug in unterschiedlichen, zur Mittelachse der Schraube geneigten Schraubrichtungen angesetzt werden kann, so daß die Übertragung von Biegemomenten auf den Be reich der Sollbruchstelle verhindert ist, so daß die Soll bruchstelle ausschließlich durch das Einschraubmoment be lastet ist. In a preferred embodiment of the torque, the ser preferred connection means containing the other screw through a predetermined breaking point separated approach designed in such a spherically that a screwing in different slanted to the center axis of the screw helical directions may be set so that the transmission of bending moments on the loading of the predetermined breaking point is rich prevented, so that the predetermined breaking point solely by the screwing torque be overloaded.

Die Sollbruchstelle ist in günstiger Weiterbildung der Erfindung als Einschnürung symmetrisch zur Mittelachse der Schraube abgedreht dem Anschluß an die Stirnfläche des Schraubenkopfes angeordnet, so daß diese Fläche nach Ent fernen des Drehmomentübertragungselements einen bündigen Abschluß bildet. The predetermined breaking point of the invention as a constriction is symmetrical turned to the central axis of the screw arranged connecting to the end face of the screw head in an advantageous further development, so that this surface forms a flush termination according Ent far the torque transmitting member.

Vorteilhafte Weiterbildungen der Erfindung sind in den Un teransprüchen gekennzeichnet bzw. werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführung der Erfindung anhand der Figuren näher dargestellt. Advantageous developments of the invention are characterized in dependent claims the Un and will be described in more detail below together with the description of the preferred embodiments of the invention with reference to FIGS.

Die einzige Figur stellt ein Ausführungsbeispiel der er findungsgemäßen Schraube mit einem mit der Schraube in Eingriff kommenden Teil eines Einschraubwerkzeugs im Quer schnitt dar. The single figure illustrates an embodiment of he inventive screw with a screw coming into engagement with the part of a screw-in cross-section represents.

Eine Knochenschraube 1 entspricht in ihrem Schaftbereich 2 und dem Gewindeteil 3 der Gestaltung bekannter Knochen schrauben, wobei auch der Kopf 4 in seinem unteren Bereich in bekannter Weise ausgebildet ist. A bone screw 1 corresponds in its shank portion 2 and screw the threaded portion 3 of the design of known bone, and the head 4 is formed in its lower region in a known manner. Eine derartige Schraube dient zur Fixierung von Knochenfragmenten oder zum Halten einer Knochenplatte, wobei die Zugkraft durch den Eingriff des Gewindes 3 (auf Spongiosa- oder Kortika lisgewinde) dient und die Gegenkraft von der verrundeten Unterseite des Kopfes 4 aufgenommen wird, die sphärisch ausgebildet ist. Such a screw is used for fixing bone fragments or for holding a bone plate, wherein the tensile force acts by the engagement of the thread 3 (on cancellous or Kortika lisgewinde) and the counter force from the rounded bottom of the head 4 is received, which is spherical.

Im Anschluß an die Stirnfläche 5 des Schraubenkopfes ist eine Sollbruchstelle 6 in Form einer Einschnürung vorge sehen, welche derart bemessen ist, daß hier ein Bruch eher eintritt als in den übrigen Schraubenbereichen. Subsequent to the end face 5 of the screw head is a predetermined breaking point see provided in the form of a constriction 6, which is dimensioned such that there is a breakdown occurs rather than in the other screw portions. Bei üblicher Dimensionierung und sanftem Auslauf der Ein schnürung um Kraftspitzen zu vermeiden ist der Durch messer im Bereich dieser Einschnürung bzw. ist der Quer schnitt dieser Einschnürung also geringfügig geringer auszubilden als der entsprechende Querschnitt des Schaftes 2 . Is at standard dimensioning and a gentle exit of the A constriction in order to avoid force peaks of the diameter in the area of this constriction and the cross-section of said constriction so form slightly less than the corresponding cross section of the shank. 2 (Bei vom runden Querschnitt abweichender Gestaltung ist in jedem Fall auf die übertragbaren Momente abzustellen). (In the round cross-section differing design is shut in any case the transferable torques).

Im Anschluß an die Einschnürung 6 ist ein Ansatz 7 vorge sehen, welcher Außensechskantflächen aufweist, die zur Übertragung des maximalen, durch die Sollbruchstelle vor gegebenen Einschraubmoments ausreichend sind. Following the constriction 6, an approach is provided on the last 7, which has external hex surfaces for transmission of the maximum, sufficient by the predetermined breaking point before given Einschraubmoments. Die Über tragung von Biegemomenten auf die Sollbruchstelle ist zu vermeiden. To the delegation of bending moments to the breaking point should be avoided. Da diese zu einem Bruch derselben bei kleineren Drehmomenten führen könnten, sind die Außensechskant flächen derart ballig ausgeführt, daß Abweichungen des Schraubendrehers 8 von der Längsachse der Schraube, dh eine Neigung um einen geringen Winkel dieser Richtung nicht zu derartigen Biegemomenten führt, da insoweit die beiden Teile 7 und 8 relativ zueinander beweglich sind. Since these at a fraction of the same could result in lower torques, the external hexagon surfaces of such spherical pointed out that deviations of the driver 8 from the longitudinal axis of the screw, ie a tilt through a small angle of this direction does not lead to such bending moments as far as the two parts 7 and 8 are movable relative to each other. Dieser Umstand des nur teilweisen gegenseitigen Eingriffs wegen der balligen Ausgestaltung ist bei der Dimensio nierung der Drehmomentübertragungsflächen zu berücksich tigen, wobei hier keinerlei Schwierigkeiten auftreten, da der Ansatz 7 ein Verlustelement bildet, der die Größe der im Knochen verbleibenden Schraube nicht beeinflußt. This circumstance of only partial mutual engagement because of the spherical configuration is in Dimensio the torque transmission faces discrimination term to into account, which occur no difficulty here because the approach 7 forms a loss element which does not affect the size of the remaining bone screw.

Bei dem Schraubendreher 8 handelt es sich um ein Ein schraubelement, welches in negativer Ausbildung als Aus sparung Flächen aufweist, die an den Querschnitt zur Über tragung des Einschraubmoments des Ansatzes 7 angepaßt sind. In the screwdriver 8 is a a screw, which savings as from negative training has surfaces which are adapted to the cross-section for transmission over the Einschraubmoments of the approach. 7 Bei einer vorteilhaften - nicht dargestellten - Va riante können an Stelle der Flächen des Ansatzes 7 auch die Innenflächen 9 des Schraubendrehers ballig ausgefüllt sein. In an advantageous embodiment - not shown - VaRIaTIon well as the inner surfaces 9 of the screwdriver may be filled spherical instead of the faces of the lug. 7

Die Knochenschraube 1 besteht bevorzugt aus einem inner halb des Körpers resorbierbarem Werkstoff. The bone screw 1 preferably consists of an inner half of the body-absorbable material. Damit braucht die Schraube lediglich in den Knochen eingedreht zu werden und kann mit einem beliebig großen Moment festgezogen wer den, ohne daß Gefahr für die Schraube selbst besteht. So that the screw only needs to be screwed into the bone and can with any great moment tightened who, without the risk of the screw itself. Das übertragbare Moment ist begrenzt durch die Festigkeit der Sollbruchstelle, so daß die Trennung hier ein Zeichen für den Chirurgen ist, daß die Schraube mit dem Sollmoment angezogen wurde. The transmissible torque is limited by the strength of the rated breaking point, so that the separation here is a mark for the surgeon that the screw has been tightened to the desired torque.

Um bei einer Korrektur des Schraubensitzes ein Ausschrau ben gegebenenfalls noch zu ermöglichen, sind bevorzugt im Bereich des oberen Teils des Schraubenkopfes 4 Anfasungen 10 vorgesehen, welche in Wechselwirkung mit einer Zange oder dergleichen ein Drehen der Schraube nur in Sonderfäl len ermöglichen sollen. To allow ben optionally one Ausschrau when correcting the screw seat, 4 chamfers 10 are provided preferably in the area of the upper part of the screw head, which are intended to facilitate interacting with a pliers or the like turning the screw only in Sonderfäl len. Da diese Flächen sehr weit von der Mittelachse entfernt sind, brauchen sie nicht besonders ausgeprägt ausgebildet zu sein, wobei sie, da sie im obe ren Teil des Kopfes gelegen sind, auch dann noch erreich bar sind, wenn die Schraube fast vollständig eingedreht ist. Since these areas are very far away from the central axis, they need not be designed to be particularly pronounced, with them, as they are located in obe ren part of the head, are still Reach bar even when the screw is almost completely screwed. Auch wenn die Schraube bereits am Ende eingedreht wurde, kann dieser Bereich noch ohne größere Schädigung von Knochenbereichen freigemacht werden, um die Ausdreh möglichkeit sicherzustellen. Even if the screw is screwed already in the end, this area can be cleared without major damage to bone regions to ensure the possibility Boring.

Die Erfindung beschränkt sich in ihrer Ausführung nicht auf das vorstehend angegebene bevorzugte Ausführungsbei spiel. The invention is not limited in its embodiment to the above-described preferred Ausführungsbei game. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch machen. Rather, a number of variants which make use of the described solution even for basically different configurations.

Claims (6)

1. Knochenschraube mit einem Element zur Drehmomentüber tragung im Bereich des Kopfes, dadurch gekennzeichnet, daß das Element zur Drehmomentübertragung von einem eine Auflagefläche enthaltenden Kopf durch eine Sollbruchstelle getrennt ist, deren Bruchmoment kleiner ist als das durch die übrige Schraube, insbesondere den Schraubenschaft, übertragbare Moment. 1. Bone screw with an element for torque transmission in the region of the head, characterized in that the element for transferring torque from a one support surface containing head by a predetermined breaking point is separated whose breaking torque is less than that through the rest of the screw, especially the screw shank, communicable Moment.
2. Knochenschraube nach Anspruch 1, dadurch gekennzeichnet, daß die Schraube aus resor bierbarem Material gefertigt ist. 2. Bone screw according to claim 1, characterized in that the screw is made of resor bierbarem material.
3. Knochenschraube nach einem der vorangehenden Ansprü che, dadurch gekennzeichnet, daß das Element zur Drehmomentübertragung als zylindrischer Ansatz gefertigt ist, der Mehrkantflächen aufweist. 3. Bone screw according to one of the preceding Ansprü surface, characterized in that the element is made to transmit torque as a cylindrical projection, having polygonal surfaces.
4. Knochenschraube nach einem der vorangehenden Ansprü che, dadurch gekennzeichnet, daß der Mehrkant als Außenmehrkant ausgebildet ist. 4. che bone screw according to one of the preceding Ansprü, characterized in that the polygon is designed as an external polygon.
5. Knochenschraube nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, daß die Mehrkantflächen derart ballig ausgeformt sind, daß ein an die Mehrkantflächen angepaßtes Schraubendrehwerkzeug in einer zur Längsachse der Schraube geneigten Richtung angreifen kann, insbesondere daß die Achse der balligen Verrundung einer Tangente eines Kreises mit der Längs achse der Schraube als Mittelpunkt bildet. 5. Bone screw according to one of claims 3 or 4, characterized in that the polygonal surfaces are formed in such a convex that a matched to the polygonal surfaces screw turning tool can engage in an inclined to the longitudinal axis of the screw device, in particular that the axis of the crowned fillet of a tangent of a circle with the longitudinal axis of the screw as the center forms.
6. Knochenschraube nach einem der vorangehenden Ansprü che, dadurch gekennzeichnet, daß der restliche, bezogen auf die Sollbruchstelle, dem Schraubenschaft benachbarte Bereich des Schraubenkopfes zusätzliche Flächen zur Drehmomentübertragung aufweist. 6. Bone screw according to one of the preceding Ansprü surface, characterized in that the remaining, based on the predetermined breaking point, adjacent to the screw shaft portion of the screw head has additional surfaces for torque transmission.
DE19863630863 1986-09-08 1986-09-08 Bone screw Withdrawn DE3630863A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19863630863 DE3630863A1 (en) 1986-09-08 1986-09-08 Bone screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863630863 DE3630863A1 (en) 1986-09-08 1986-09-08 Bone screw

Publications (1)

Publication Number Publication Date
DE3630863A1 true DE3630863A1 (en) 1988-03-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863630863 Withdrawn DE3630863A1 (en) 1986-09-08 1986-09-08 Bone screw

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Cited By (64)

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EP0276153A2 (en) * 1987-01-22 1988-07-27 Ethicon Inc. Bone screw
EP0419597A1 (en) * 1989-02-08 1991-04-03 Mitek Surgical Prod Suture anchor and suture anchor installation tool.
EP0442629A1 (en) * 1990-02-13 1991-08-21 Textron Inc. Drive system for prosthetic fasteners
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EP0654248A1 (en) * 1993-11-23 1995-05-24 Anton Prof. Dr. Härle Load transfer member for osteosynthesis
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US6030162A (en) * 1998-12-18 2000-02-29 Acumed, Inc. Axial tension screw
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ES2302464A1 (en) * 2006-12-29 2008-07-01 Ridelin, S.L. dynamometric screw fuse anti-tilt head.
US7651497B2 (en) 1997-02-11 2010-01-26 Warsaw Orthopedic, Inc. Segmentable plate with locking element
US7704255B2 (en) 1997-02-11 2010-04-27 Warsaw Orthopedic, Inc. Threadless multi-lock anterior cervical plating system
US8070786B2 (en) 1993-01-21 2011-12-06 Acumed Llc System for fusing joints
US8128667B2 (en) 2002-09-06 2012-03-06 Jackson Roger P Anti-splay medical implant closure with multi-surface removal aperture
US8137386B2 (en) 2003-08-28 2012-03-20 Jackson Roger P Polyaxial bone screw apparatus
US8257402B2 (en) 2002-09-06 2012-09-04 Jackson Roger P Closure for rod receiving orthopedic implant having left handed thread removal
US8273109B2 (en) 2002-09-06 2012-09-25 Jackson Roger P Helical wound mechanically interlocking mating guide and advancement structure
US8366753B2 (en) 2003-06-18 2013-02-05 Jackson Roger P Polyaxial bone screw assembly with fixed retaining structure
US8377100B2 (en) 2000-12-08 2013-02-19 Roger P. Jackson Closure for open-headed medical implant
US8398682B2 (en) 2003-06-18 2013-03-19 Roger P. Jackson Polyaxial bone screw assembly
US8454658B2 (en) 2009-06-26 2013-06-04 Aesculap Ag Surgical bone anchoring device and spinal column fixation system
US8814913B2 (en) 2002-09-06 2014-08-26 Roger P Jackson Helical guide and advancement flange with break-off extensions
US8852239B2 (en) 2013-02-15 2014-10-07 Roger P Jackson Sagittal angle screw with integral shank and receiver
US8870928B2 (en) 2002-09-06 2014-10-28 Roger P. Jackson Helical guide and advancement flange with radially loaded lip
US8911478B2 (en) 2012-11-21 2014-12-16 Roger P. Jackson Splay control closure for open bone anchor
US8926672B2 (en) 2004-11-10 2015-01-06 Roger P. Jackson Splay control closure for open bone anchor
US8926670B2 (en) 2003-06-18 2015-01-06 Roger P. Jackson Polyaxial bone screw assembly
US8998960B2 (en) 2004-11-10 2015-04-07 Roger P. Jackson Polyaxial bone screw with helically wound capture connection
US9161793B2 (en) 1993-01-21 2015-10-20 Acumed Llc Axial tension screw
US9308027B2 (en) 2005-05-27 2016-04-12 Roger P Jackson Polyaxial bone screw with shank articulation pressure insert and method
US9414863B2 (en) 2005-02-22 2016-08-16 Roger P. Jackson Polyaxial bone screw with spherical capture, compression insert and alignment and retention structures
US9451993B2 (en) 2014-01-09 2016-09-27 Roger P. Jackson Bi-radial pop-on cervical bone anchor
US9522021B2 (en) 2004-11-23 2016-12-20 Roger P. Jackson Polyaxial bone anchor with retainer with notch for mono-axial motion
US9566092B2 (en) 2013-10-29 2017-02-14 Roger P. Jackson Cervical bone anchor with collet retainer and outer locking sleeve
US9597119B2 (en) 2014-06-04 2017-03-21 Roger P. Jackson Polyaxial bone anchor with polymer sleeve
US9636146B2 (en) 2012-01-10 2017-05-02 Roger P. Jackson Multi-start closures for open implants
US9662143B2 (en) 2004-02-27 2017-05-30 Roger P Jackson Dynamic fixation assemblies with inner core and outer coil-like member
USRE46431E1 (en) 2003-06-18 2017-06-13 Roger P Jackson Polyaxial bone anchor with helical capture connection, insert and dual locking assembly
US9717533B2 (en) 2013-12-12 2017-08-01 Roger P. Jackson Bone anchor closure pivot-splay control flange form guide and advancement structure
US9717534B2 (en) 2009-06-15 2017-08-01 Roger P. Jackson Polyaxial bone anchor with pop-on shank and friction fit retainer with low profile edge lock
US10058354B2 (en) 2013-01-28 2018-08-28 Roger P. Jackson Pivotal bone anchor assembly with frictional shank head seating surfaces
US10064658B2 (en) 2014-06-04 2018-09-04 Roger P. Jackson Polyaxial bone anchor with insert guides

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EP1719473A3 (en) * 1998-12-23 2007-01-17 BEGO Implant Systems GmbH & Co. KG Tool for screwing in an assembly having a dental implant
EP1257219B1 (en) * 2000-02-24 2012-01-18 Stryker Instruments Device for heating bioabsorbable plates
EP1257219A2 (en) * 2000-02-24 2002-11-20 Stryker Instruments Bioabsorbable plates, fasteners, tools and method of using same
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US8398682B2 (en) 2003-06-18 2013-03-19 Roger P. Jackson Polyaxial bone screw assembly
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US9743957B2 (en) 2004-11-10 2017-08-29 Roger P. Jackson Polyaxial bone screw with shank articulation pressure insert and method
US8998960B2 (en) 2004-11-10 2015-04-07 Roger P. Jackson Polyaxial bone screw with helically wound capture connection
US9522021B2 (en) 2004-11-23 2016-12-20 Roger P. Jackson Polyaxial bone anchor with retainer with notch for mono-axial motion
US9414863B2 (en) 2005-02-22 2016-08-16 Roger P. Jackson Polyaxial bone screw with spherical capture, compression insert and alignment and retention structures
US9308027B2 (en) 2005-05-27 2016-04-12 Roger P Jackson Polyaxial bone screw with shank articulation pressure insert and method
EP1939464A3 (en) * 2006-12-29 2010-07-21 Ridelin, S.L. A dynamometric screw with antiflexure fusible head
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US8454658B2 (en) 2009-06-26 2013-06-04 Aesculap Ag Surgical bone anchoring device and spinal column fixation system
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US8852239B2 (en) 2013-02-15 2014-10-07 Roger P Jackson Sagittal angle screw with integral shank and receiver
US9566092B2 (en) 2013-10-29 2017-02-14 Roger P. Jackson Cervical bone anchor with collet retainer and outer locking sleeve
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US9451993B2 (en) 2014-01-09 2016-09-27 Roger P. Jackson Bi-radial pop-on cervical bone anchor
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