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
head
bone screw
bone
torque transmission
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Withdrawn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
Withdrawn legal-status Critical Current

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 in the upper Concept of claim 1 specified 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. Die Schraube muß in diesem Fall ausge­ fräst werden, was mit der Zerstörung von plötzlichen Knochenbereichen verbunden ist. Im übrigen kann im Be­ reich der Ausfräsung keine weitere Schraube angebracht werden.The known bone screws have the disadvantage that that they might be so tight when they were implanted be that the shank or some other part of the screw breaks, so that the function of the screw is no longer ge is guaranteed. In this case, the screw must be removed be milling what with the destruction of sudden Bone areas is connected. For the rest, in Be no further screw is attached to the cutout will.

Der Erfindung liegt die Aufgabe zugrunde, bei Knochen­ schrauben sicherzustellen, daß die Einschraubmomente einen die Schraube gefährdenden Wert nicht erreichen.The invention is based, with bone screws to ensure that the screwing in torque do not reach the screw dangerous value.

Besonders vorteilhaft ist die Anwendung bei resorbierbarem Implantatmaterial, das spröder ist als die üblicherweise verwendeten Schraubenwerkstoffe. 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. Lediglich die Zugkraftkomponenten der Schraube aufnehmende Elemente wie Gewinde und Schrauben­ kopf müssen erhalten bleiben.Use in the case of resorbable is particularly advantageous Implant material that is more brittle than usual used screw materials. Because such screws do not have to be unscrewed again because of the material can be absorbed within the body after the on also screw on the torque transmission elements to be waived. Only the traction components of the Screw-receiving elements such as threads and screws head must be preserved.

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 solution according to the invention above the usual and standardized for bone screws  Hexagon socket connected the advantage that the cross do not cut the screw head through the corresponding one Recess is weakened and thus in dimension screw on the reduced residual cross cut the head in the area of the bottom of the hexagon socket edge needs to be taken into account.

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 development of the torque connection means containing the rest of the screw Approach separated by a predetermined breaking point is ser preferably formed so spherical that the one screwing tool in different, to the central axis of the Screw inclined screw directions can be applied can, so that the transmission of bending moments on the loading range of the predetermined breaking point is prevented, so that the target break point only due to the screwing torque is burdensome.

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 is a further development of the Invention as a constriction symmetrical to the central axis of the Unscrewed the connection to the face of the Screw head arranged so that this surface after Ent distal of the torque transmission element a flush Concludes.

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 in the Un claims are identified below along with the description of the preferred embodiment the invention with reference to the figures.

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 only figure represents an embodiment of the inventive screw with one with the screw in Engaging part of a screwing tool in the cross cut.

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. 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.A bone screw 1 corresponds in its shaft region 2 and the threaded part 3 to the design of known bones, the head 4 also being designed in a known manner in its lower region. Such a screw is used to fix bone fragments or to hold a bone plate, the tensile force due to the engagement of the thread 3 (on cancellous or cortical lis thread) and the counterforce is absorbed by the rounded underside of the head 4 , 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. 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. (Bei vom runden Querschnitt abweichender Gestaltung ist in jedem Fall auf die übertragbaren Momente abzustellen).Following the end face 5 of the screw head, a predetermined breaking point 6 is provided in the form of a constriction, which is dimensioned such that a break occurs here sooner than in the other screw areas. With customary dimensioning and gentle runout of a constriction to avoid force peaks, the diameter in the region of this constriction or the cross section of this constriction is therefore slightly less than the corresponding cross section of the shaft 2 . (In the case of a design deviating from the round cross-section, the transferable moments must always be taken into account).

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. Die Über­ tragung von Biegemomenten auf die Sollbruchstelle ist zu vermeiden. 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, d.h. 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. 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.Following the constriction 6 , an approach 7 is easily seen, which has external hex surfaces that are sufficient to transmit the maximum, through the predetermined breaking point before given screwing torque. The transfer of bending moments to the predetermined breaking point should be avoided. Since these could lead to a breakage at smaller torques, the external hexagon surfaces are designed so spherically that deviations of the screwdriver 8 from the longitudinal axis of the screw, ie an inclination by a small angle in this direction, do not lead to such bending moments, since the two of them Parts 7 and 8 are movable relative to each other. This circumstance of only partial mutual intervention because of the spherical configuration is to be taken into account in the dimensioning of the torque transmission surfaces, with no difficulties arising here since the attachment 7 forms a loss element which does not influence the size of the screw remaining in the bone.

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. Bei einer vorteilhaften - nicht dargestellten - Va­ riante können an Stelle der Flächen des Ansatzes 7 auch die Innenflächen 9 des Schraubendrehers ballig ausgefüllt sein.The screwdriver 8 is a screw-on element, which has a negative design as a savings area that is adapted to the cross-section for transferring the screw-in torque of the projection 7 . In an advantageous - not shown - Va riante, the inner surfaces 9 of the screwdriver can be filled spherically instead of the surfaces of the extension 7 .

Die Knochenschraube 1 besteht bevorzugt aus einem inner­ halb des Körpers resorbierbarem Werkstoff. 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. 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 bone screw 1 preferably consists of an inner half of the body absorbable material. So that the screw only needs to be screwed into the bone and can be tightened with an arbitrarily large moment who without the risk of the screw itself. The transmissible torque is limited by the strength of the predetermined breaking point, so that the separation here is a sign 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. 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. 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.In order to enable a screwing out of a screw seat if necessary, chamfering 10 are preferably provided in the upper part of the screw head 4 , which, in interaction with pliers or the like, should only enable the screw to be turned in special cases. Since these surfaces are very far from the central axis, they do not need to be particularly pronounced, and since they are located in the upper part of the head, they can still be reached when the screw is almost completely screwed in. Even if the screw was already screwed in at the end, this area can still be cleared without major damage to bone areas to ensure that it can be removed.

Die Erfindung beschränkt sich in ihrer Ausführung nicht auf das vorstehend angegebene bevorzugte Ausführungsbei­ spiel. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch machen.The invention is not restricted in its implementation to the preferred embodiment given above game. Rather, a number of variants are conceivable which of the solution shown also in principle make use of different types.

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 area of the head, characterized in that the element for torque transmission is separated from a head containing a support surface by a predetermined breaking point, the breaking torque is smaller than that which can be transmitted by the remaining screw, in particular the screw shaft 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 characterized that the screw from resor material that can be made.
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 claims che, characterized in that the element for torque transmission as a cylindrical Approach is made that has polygonal surfaces.
4. Knochenschraube nach einem der vorangehenden Ansprü­ che, dadurch gekennzeichnet, daß der Mehrkant als Außenmehrkant ausgebildet ist.4. Bone screw according to one of the preceding claims che, 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 so spherical that a the screwdriver tool adapted to the polygonal surfaces a direction inclined to the longitudinal axis of the screw can attack, especially that the axis of the crowned Rounding a tangent of a circle with the longitudinal axis of the screw forms the center.  
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 claims che, characterized in that the rest, based on the predetermined breaking point, the Screw shaft adjacent area of the screw head has additional areas 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

Family

ID=6309325

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 (67)

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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
US5062843A (en) * 1990-02-07 1991-11-05 Mahony Iii Thomas H Interference fixation screw with integral instrumentation
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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. A dynamometric screw with antiflexure fusible 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
US8926670B2 (en) 2003-06-18 2015-01-06 Roger P. Jackson Polyaxial bone screw assembly
US8926672B2 (en) 2004-11-10 2015-01-06 Roger P. Jackson Splay control closure for open bone anchor
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
CN107835668A (en) * 2015-05-11 2018-03-23 普罗维登斯医疗技术公司 Method for being implanted into bone screws
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
WO2019042974A3 (en) * 2017-08-28 2019-06-06 botiss biomaterials GmbH Dental screw
US10349983B2 (en) 2003-05-22 2019-07-16 Alphatec Spine, Inc. Pivotal bone anchor assembly with biased bushing for pre-lock friction fit

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US9662143B2 (en) 2004-02-27 2017-05-30 Roger P Jackson Dynamic fixation assemblies with inner core and outer coil-like member
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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
USRE47551E1 (en) 2005-02-22 2019-08-06 Roger P. Jackson Polyaxial bone screw with spherical capture, compression insert and alignment and retention structures
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US9636146B2 (en) 2012-01-10 2017-05-02 Roger P. Jackson Multi-start closures for open implants
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US9770265B2 (en) 2012-11-21 2017-09-26 Roger P. Jackson Splay control closure for open bone anchor
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US9566092B2 (en) 2013-10-29 2017-02-14 Roger P. Jackson Cervical bone anchor with collet retainer and outer locking sleeve
US9717533B2 (en) 2013-12-12 2017-08-01 Roger P. Jackson Bone anchor closure pivot-splay control flange form guide and advancement structure
US9451993B2 (en) 2014-01-09 2016-09-27 Roger P. Jackson Bi-radial pop-on cervical bone anchor
US10064658B2 (en) 2014-06-04 2018-09-04 Roger P. Jackson Polyaxial bone anchor with insert guides
US9597119B2 (en) 2014-06-04 2017-03-21 Roger P. Jackson Polyaxial bone anchor with polymer sleeve
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