DE19912364A1 - Screw to fix reinforcement rod along spinal column; has U-shaped recess for reinforcement rod with saw-tooth thread having surfaces at negative angle to secure fixing screw - Google Patents
Screw to fix reinforcement rod along spinal column; has U-shaped recess for reinforcement rod with saw-tooth thread having surfaces at negative angle to secure fixing screwInfo
- Publication number
- DE19912364A1 DE19912364A1 DE1999112364 DE19912364A DE19912364A1 DE 19912364 A1 DE19912364 A1 DE 19912364A1 DE 1999112364 DE1999112364 DE 1999112364 DE 19912364 A DE19912364 A DE 19912364A DE 19912364 A1 DE19912364 A1 DE 19912364A1
- Authority
- DE
- Germany
- Prior art keywords
- screw
- reinforcement rod
- saw
- negative angle
- thread
- 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
- 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
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
Abstract
Description
Die Erfindung richtet sich auf eine Pedikelschraube zur Befestigung einer Versteifungsstange längs der Wirbelsäule, umfassend einen in die Kno chenmasse eines Wirbels einschraubbaren Gewindeabschnitt und einen Kopf mit einer im wesentlichen U-förmigen, von U-Schenkeln begrenzten Ausnehmung zum Einsetzen der Versteifungsstange und ein Innengewinde an den U-Schenkeln zum Fixieren der Versteifungsstange in der Ausneh mung mit Hilfe einer Befestigungsschraube.The invention is directed to a pedicle screw for fastening a Stiffening bar along the spine, including one in the knot Chen mass of a vertebra screw-in threaded section and one Head with an essentially U-shaped, delimited by U-legs Recess for inserting the stiffening rod and an internal thread on the U-legs to fix the stiffening rod in the recess using a fastening screw.
Pedikelschrauben der gattungsgemäßen Art werden beispielsweise be schrieben in DE 42 38 339 A1, DE 89 15 443 U1 und WO 90/01156.Pedicle screws of the generic type are, for example, be wrote in DE 42 38 339 A1, DE 89 15 443 U1 and WO 90/01156.
Bei einer Ausführungsform von bekannten Pedikelschrauben sind Abdeck kappen vorgesehen, welche dazu dienen, nach dem Einschrauben der Befe stigungsschraube die Oberseite desselben abzudecken. Aus der erstge nannten Druckschrift ist eine Lösung bekannt, wonach auf den Kopf der Pedikelschraube eine diesen außen übergreifende Schraubenführungshülse aufgesetzt wird. Diese Schraubenführungshülse hat den Vorteil, das Ein drehen der Befestigungsschraube intraoperativ zu erleichtern. Darüber hin aus werden die U-Schenkel, die die U-Ausnehmung begrenzen, durch diese Schraubenfilirungshülse zusammengehalten gegen die Aufspreizkraft, die auf sie wirkt, wenn die Befestigungsschraube angezogen wird.In one embodiment of known pedicle screws are covers caps provided, which are used after screwing the Befe cover screw to cover the top of the same. From the first called a solution is known, according to which the head of Pedicle screw a screw guide sleeve that overlaps this outside is put on. This screw guide sleeve has the advantage of being one turning the mounting screw intraoperatively to facilitate. Beyond that out of the U-legs, which limit the U-recess, through this Screw filtration sleeve held together against the spreading force it acts when the fastening screw is tightened.
Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine Pedi kelschraube so auszugestalten, daß das Aufspreizen der U-Schenkel beim Anziehen der Befestigungsschraube vermieden wird, ohne daß hierfür eine Schraubenführungshülse oder eine an sich auch bekannte äußere Ring anordnung erforderlich wären.Proceeding from this, the object of the invention is a pedi Construct the screw so that the spreading of the U-legs when Tightening the fastening screw is avoided without this Screw guide sleeve or an outer ring known per se arrangement would be required.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Innengewin de des Kopfes als Sägezahngewinde derart ausgebildet ist, daß diejenigen Gewindeflanken, die beim Anziehen der Befestigungsschraube als Anlage dienen, einen negativen Winkel aufweisen.This object is achieved in that the internal thread de the head is designed as a sawtooth thread such that those Thread flanks that when tightening the fastening screw as an attachment serve, have a negative angle.
Mit anderen Worten springt diese Gewindeflanke zurück. Dies hat zu Fol ge, daß beim Anziehen der Befestigungsschraube der Kopf der Pedikel schraube nicht auseinandergedrückt wird, sondern ein die U-Schenkel des Kopfes nach innen zusammendrückendes Kraftmoment auf diese wirkt.In other words, this thread flank springs back. This has fol ge that when tightening the fastening screw the head of the pedicle screw is not pushed apart, but the U-legs of the Force that compresses the head inwards acts on it.
Auf diese Weise läßt sich eine optimale Festlegung bei einfachster kon struktiver Ausgestaltung erzielen.In this way, an optimal determination with the simplest con achieve structural design.
Nachfolgend wird die Erfindung anhand eines bevorzugten Ausführungs beispiels in Verbindung mit der Zeichnung näher erläutert. Dabei zeigen:The invention is described below on the basis of a preferred embodiment example explained in connection with the drawing. Show:
Fig. 1 einen Schnitt durch den Kopf einer erfindungsgemäßen Pedikel schraube und eine Versteifungsstange,Screw Fig. 1 is a section through the head of a pedicle of the invention and a stiffening rod,
Fig. 2 eine Fig. 1 entsprechende Darstellung mit eingesetzter Befestigungs schraube und Fig. 2 is a Fig. 1 corresponding representation with inserted fastening screw and
Fig. 3 eine vergrößerte schematische Darstellung des Gewindes im Kopf der Pedikelschraube. Fig. 3 is an enlarged schematic representation of the thread in the head of the pedicle screw.
Eine in der Zeichnung dargestellte Pedikelschraube 1 umfaßt einen Schaft 2 mit einem in der Zeichnung nicht dargestellten Außengewinde sowie einen Kopf 3 mit einer zentralen, U-förmigen Ausnehmung 4 zur Aufnahme einer Versteifungsstange 5, welche von U-Schenkeln 6, 7 begrenzt wird, die an ihrer Innenseite ein Innengewinde 8 tragen.A pedicle screw 1 shown in the drawing comprises a shaft 2 with an external thread, not shown in the drawing, and a head 3 with a central, U-shaped recess 4 for receiving a stiffening rod 5 , which is delimited by U-legs 6 , 7 which carry an internal thread 8 on the inside.
Zur Festlegung der Versteifungsstange 5 in der Ausnehmung 4 dient eine als Madenschraube ausgebildete Befestigungsschraube 9 mit einem Außen gewinde 10, welches dem Innengewinde 8 des Kopfes entspricht.To fix the stiffening rod 5 in the recess 4 is a fastening screw 9 designed as a grub screw with an external thread 10 , which corresponds to the internal thread 8 of the head.
Wie bereits erwähnt wurde, besteht ein Problem beim Anziehen der Befe stigungsschraube 9 darin, daß bei den herkömmlich ausgestalteten Pedikel schrauben die U-Schenkel 6, 7 des Schraubenkopfes 3 nach außen gedrückt werden, was zu einer Reduzierung der Haltekraft führt bzw. das Vorsehen von aufzusetzenden Hülsen oder dergleichen erforderlich macht.As already mentioned, there is a problem when tightening the fastening screw 9 that the U-legs 6 , 7 of the screw head 3 are pressed outward in the conventionally designed pedicle, which leads to a reduction in the holding force or the provision of to be put on sleeves or the like.
Die erfindungsgemäß vorgesehenen Gewinde 8, 10 vermeiden dieses Pro
blem. In Fig. 3 ist ein erfindungsgemäß vorgesehenes Sägezahngewinde 10
als vergrößerter Ausschnitt des in Fig. 2 rechts dargestellten Gewindeteils
veranschaulicht. Daraus ist zu erkennen, daß diejenige Gewindeflanke 11,
welche beim Anziehen der Befestigungsschraube 9 als Anlage- und
Lastabtragungsfläche dient, gegenüber der radialen Richtung 12 um einen
Winkel β zurückspringt. In Fig. 3 sind eingezeichnet die senkrecht auf die
Flanke 11 wirkende Kraftkomponente Fnormal, die in axialer Richtung der
Pedikelschraube wirkende Kraftkomponente Faxial und eine resultierende
Kraftkomponente radial nach innen Fradial, d. h. also eine Kraftkomponente,
die im Gegensatz zu Pedikelschrauben nach dem Stand der Technik diese
nach innen zusammendrückt. Für die radiale Komponente Fradial gilt:
The threads 8 , 10 provided according to the invention avoid this problem. In Fig. 3 a according to the invention provided buttress 10 is illustrated as an enlarged detail of the threaded part shown in Fig. 2 to the right. From this it can be seen that the thread flank 11 , which serves as a contact and load transfer surface when the fastening screw 9 is tightened, springs back by an angle β with respect to the radial direction 12 . In Fig. 3, the force acting perpendicularly to the flank 11 component force F acting in the axial direction of the pedicle screw force component F are drawn normal, axial and a resultant force component radially inwardly F radially, so that a force component, in contrast to pedicle screws according to the prior technology squeezes them inwards. The following applies to the radial component F radial :
Fradial = Faxial.tan β.F radial = F axial .tan β.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999112364 DE19912364B4 (en) | 1999-03-19 | 1999-03-19 | pedicle screw |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999112364 DE19912364B4 (en) | 1999-03-19 | 1999-03-19 | pedicle screw |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19912364A1 true DE19912364A1 (en) | 2000-10-12 |
DE19912364B4 DE19912364B4 (en) | 2004-10-07 |
Family
ID=7901616
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1999112364 Expired - Fee Related DE19912364B4 (en) | 1999-03-19 | 1999-03-19 | pedicle screw |
Country Status (1)
Country | Link |
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DE (1) | DE19912364B4 (en) |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1219255A1 (en) * | 2000-12-27 | 2002-07-03 | BIEDERMANN MOTECH GmbH | Screw for connection to a rod |
EP1426016A1 (en) * | 2002-12-02 | 2004-06-09 | BIEDERMANN MOTECH GmbH | Member having a shaft connected to a holding member for coupling to a rod |
EP2070485A1 (en) * | 2007-12-13 | 2009-06-17 | Biedermann Motech GmbH | Anchoring device for anchoring a rod in bones or vertebrae |
US7854751B2 (en) | 2003-12-16 | 2010-12-21 | Dupuy Spine, Inc. | Percutaneous access devices and bone anchor assemblies |
ES2352720A1 (en) * | 2009-01-26 | 2011-02-09 | Surgival Co S A | Fixing device for prisoner screw and self-tiling tulip. (Machine-translation by Google Translate, not legally binding) |
US7918857B2 (en) | 2006-09-26 | 2011-04-05 | Depuy Spine, Inc. | Minimally invasive bone anchor extensions |
EP2468197A1 (en) * | 2010-12-23 | 2012-06-27 | Biedermann Technologies GmbH & Co. KG | Stabilization device for stabilizing vertebrae or bone parts |
US8828060B2 (en) | 2001-11-27 | 2014-09-09 | Biedermann Technologies Gmbh & Co. Kg | Element with a shank and a holding element connected to it for connecting to a rod |
DE102014108705A1 (en) * | 2014-06-20 | 2015-12-24 | Aesculap Ag | Pedicle screw with screw-in aid |
DE102016101822A1 (en) * | 2016-02-02 | 2017-08-03 | Aesculap Ag | Instrument for guiding a rod into an implant receptacle |
US9848918B2 (en) | 2005-11-21 | 2017-12-26 | DePuy Synthes Products, Inc. | Polyaxial bone anchors with increased angulation |
US9974571B2 (en) | 2008-09-12 | 2018-05-22 | DePuy Synthes Products, Inc. | Spinal stabilizing and guiding fixation system |
US10105163B2 (en) | 2009-04-15 | 2018-10-23 | DePuy Synthes Products, Inc. | Revision connector for spinal constructs |
US10136923B2 (en) | 2007-07-20 | 2018-11-27 | DePuy Synthes Products, Inc. | Polyaxial bone fixation element |
US10154859B2 (en) | 2008-09-29 | 2018-12-18 | DePuy Synthes Products, Inc. | Polyaxial bottom-loading screw and rod assembly |
US10405892B2 (en) | 2008-11-03 | 2019-09-10 | DePuy Synthes Products, Inc. | Uni-planer bone fixation assembly |
US11006978B2 (en) | 2009-06-17 | 2021-05-18 | DePuy Synthes Products, Inc. | Revision connector for spinal constructs |
US11045232B2 (en) | 2016-02-02 | 2021-06-29 | Aesculap Ag | Instrument for guiding a rod into an implant holder |
US11419642B2 (en) | 2003-12-16 | 2022-08-23 | Medos International Sarl | Percutaneous access devices and bone anchor assemblies |
US11523847B2 (en) * | 2004-11-23 | 2022-12-13 | Roger P. Jackson | Fasteners with interlocking gripping threads for bone anchor receivers |
US11737789B2 (en) | 2004-11-23 | 2023-08-29 | Roger P. Jackson | Pivotal bone anchor assembly with pre-loaded retainer and bottom loaded cannulated screw having a planar top surface |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8414588B2 (en) | 2007-10-04 | 2013-04-09 | Depuy Spine, Inc. | Methods and devices for minimally invasive spinal connection element delivery |
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DE29806563U1 (en) * | 1998-04-09 | 1998-06-18 | Howmedica Gmbh | Pedicle screw and assembly aid for it |
DE29710484U1 (en) * | 1997-06-16 | 1998-10-15 | Howmedica Gmbh | Receiving part for a holding component of a spinal implant |
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FR2633177B1 (en) * | 1988-06-24 | 1991-03-08 | Fabrication Materiel Orthopedi | IMPLANT FOR A SPINAL OSTEOSYNTHESIS DEVICE, ESPECIALLY IN TRAUMATOLOGY |
DE4238339C2 (en) * | 1992-11-13 | 1994-10-06 | Peter Brehm | Pedicle screw and holding hook for fixing a stiffening rod and instruments for adjusting and attaching the stiffening rod to the pedicle screw or holding hook |
-
1999
- 1999-03-19 DE DE1999112364 patent/DE19912364B4/en not_active Expired - Fee Related
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US4854311A (en) * | 1986-01-09 | 1989-08-08 | Acro Med Corporation | Bone screw |
DE29710484U1 (en) * | 1997-06-16 | 1998-10-15 | Howmedica Gmbh | Receiving part for a holding component of a spinal implant |
EP0885598A2 (en) * | 1997-06-16 | 1998-12-23 | Howmedica GmbH | A receiving part for a retaining component of a vertebral column implant |
DE29806563U1 (en) * | 1998-04-09 | 1998-06-18 | Howmedica Gmbh | Pedicle screw and assembly aid for it |
Cited By (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1219255A1 (en) * | 2000-12-27 | 2002-07-03 | BIEDERMANN MOTECH GmbH | Screw for connection to a rod |
US7018378B2 (en) | 2000-12-27 | 2006-03-28 | Biedermann Motech Gmbh | Screw |
US8828060B2 (en) | 2001-11-27 | 2014-09-09 | Biedermann Technologies Gmbh & Co. Kg | Element with a shank and a holding element connected to it for connecting to a rod |
US10792075B2 (en) | 2001-11-27 | 2020-10-06 | Biedermann Technologies Gmbh & Co. Kg | Element with a shank and a holding element connected to it for connecting to a rod |
US9895173B2 (en) | 2001-11-27 | 2018-02-20 | Biedermann Technologies Gmbh & Co. Kg | Element with a shank and a holding element connected to it for connecting to a rod |
US7335202B2 (en) | 2002-12-02 | 2008-02-26 | Biedermann Motech Gmbh | Implant having a shaft and a hold element connected therewith for connecting with a rod |
EP1426016A1 (en) * | 2002-12-02 | 2004-06-09 | BIEDERMANN MOTECH GmbH | Member having a shaft connected to a holding member for coupling to a rod |
US7854751B2 (en) | 2003-12-16 | 2010-12-21 | Dupuy Spine, Inc. | Percutaneous access devices and bone anchor assemblies |
US10299839B2 (en) | 2003-12-16 | 2019-05-28 | Medos International Sárl | Percutaneous access devices and bone anchor assemblies |
US9439699B2 (en) | 2003-12-16 | 2016-09-13 | Medos International Sarl | Percutaneous access devices and bone anchor assemblies |
US8617210B2 (en) | 2003-12-16 | 2013-12-31 | Depuy Spine, Sarl | Percutaneous access devices and bone anchor assemblies |
US11419642B2 (en) | 2003-12-16 | 2022-08-23 | Medos International Sarl | Percutaneous access devices and bone anchor assemblies |
US8518082B2 (en) | 2003-12-16 | 2013-08-27 | Depuy Spine, Sarl | Percutaneous access devices and bone anchor assemblies |
US11523847B2 (en) * | 2004-11-23 | 2022-12-13 | Roger P. Jackson | Fasteners with interlocking gripping threads for bone anchor receivers |
US11737789B2 (en) | 2004-11-23 | 2023-08-29 | Roger P. Jackson | Pivotal bone anchor assembly with pre-loaded retainer and bottom loaded cannulated screw having a planar top surface |
US10595908B2 (en) | 2005-11-21 | 2020-03-24 | DePuy Sythes Products, Inc. | Polaxial bone anchors with increased angulation |
US11432850B2 (en) | 2005-11-21 | 2022-09-06 | DePuy Synthes Products, Inc. | Polyaxial bone anchors with increased angulation |
US9848918B2 (en) | 2005-11-21 | 2017-12-26 | DePuy Synthes Products, Inc. | Polyaxial bone anchors with increased angulation |
US7918858B2 (en) | 2006-09-26 | 2011-04-05 | Depuy Spine, Inc. | Minimally invasive bone anchor extensions |
US7918857B2 (en) | 2006-09-26 | 2011-04-05 | Depuy Spine, Inc. | Minimally invasive bone anchor extensions |
US8828007B2 (en) | 2006-09-26 | 2014-09-09 | DePuy Synthes Products, LLC | Minimally invasive bone anchor extensions |
US10898234B2 (en) | 2007-07-20 | 2021-01-26 | DePuy Synthes Products, Inc. | Polyaxial bone fixation element |
US10136923B2 (en) | 2007-07-20 | 2018-11-27 | DePuy Synthes Products, Inc. | Polyaxial bone fixation element |
US11357550B2 (en) | 2007-07-20 | 2022-06-14 | DePuy Synthes Products, Inc. | Polyaxial bone fixation element |
US11819247B2 (en) | 2007-07-20 | 2023-11-21 | DePuy Synthes Products, Inc. | Polyaxial bone fixation element |
JP2009142655A (en) * | 2007-12-13 | 2009-07-02 | Biedermann Motech Gmbh | Anchoring device for anchoring rod in bones or vertebrae and for use with at least two rods with different diameter |
EP2070485A1 (en) * | 2007-12-13 | 2009-06-17 | Biedermann Motech GmbH | Anchoring device for anchoring a rod in bones or vertebrae |
CN103750891A (en) * | 2007-12-13 | 2014-04-30 | 比德尔曼技术有限责任两合公司 | Anchoring device for anchoring a rod in bones or vertebrae |
US8257399B2 (en) | 2007-12-13 | 2012-09-04 | Biedermann Technologies Gmbh & Co. Kg | Anchoring device for anchoring a rod in bones or vertebrae |
US11890037B2 (en) | 2008-09-12 | 2024-02-06 | DePuy Synthes Products, Inc. | Spinal stabilizing and guiding fixation system |
US11129648B2 (en) | 2008-09-12 | 2021-09-28 | DePuy Synthes Products, Inc. | Spinal stabilizing and guiding fixation system |
US9974571B2 (en) | 2008-09-12 | 2018-05-22 | DePuy Synthes Products, Inc. | Spinal stabilizing and guiding fixation system |
US10154859B2 (en) | 2008-09-29 | 2018-12-18 | DePuy Synthes Products, Inc. | Polyaxial bottom-loading screw and rod assembly |
US10709479B2 (en) | 2008-09-29 | 2020-07-14 | DePuy Synthes Products, Inc. | Polyaxial bottom-loading screw and rod assembly |
US10405892B2 (en) | 2008-11-03 | 2019-09-10 | DePuy Synthes Products, Inc. | Uni-planer bone fixation assembly |
US11484348B2 (en) | 2008-11-03 | 2022-11-01 | DePuy Synthes Products, Inc. | Uni-planer bone fixation assembly |
ES2352720A1 (en) * | 2009-01-26 | 2011-02-09 | Surgival Co S A | Fixing device for prisoner screw and self-tiling tulip. (Machine-translation by Google Translate, not legally binding) |
US11020152B2 (en) | 2009-04-15 | 2021-06-01 | DePuy Synthes Products, Inc. | Revision connector for spinal constructs |
US10105163B2 (en) | 2009-04-15 | 2018-10-23 | DePuy Synthes Products, Inc. | Revision connector for spinal constructs |
US11006978B2 (en) | 2009-06-17 | 2021-05-18 | DePuy Synthes Products, Inc. | Revision connector for spinal constructs |
EP2468197A1 (en) * | 2010-12-23 | 2012-06-27 | Biedermann Technologies GmbH & Co. KG | Stabilization device for stabilizing vertebrae or bone parts |
US8764805B2 (en) | 2010-12-23 | 2014-07-01 | Biedermann Technologies Gmbh & Co. Kg | Stabilization device for stabilizing vertebrae or bone parts |
US10758275B2 (en) | 2014-06-20 | 2020-09-01 | Aesculap Ag | Pedicle screw with screw-in aid |
DE102014108705A1 (en) * | 2014-06-20 | 2015-12-24 | Aesculap Ag | Pedicle screw with screw-in aid |
US11045232B2 (en) | 2016-02-02 | 2021-06-29 | Aesculap Ag | Instrument for guiding a rod into an implant holder |
DE102016101822A1 (en) * | 2016-02-02 | 2017-08-03 | Aesculap Ag | Instrument for guiding a rod into an implant receptacle |
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R082 | Change of representative |
Representative=s name: RAU, SCHNECK & HUEBNER PATENTANWAELTE RECHTSAN, DE |
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Owner name: PETER BREHM HOLDING GMBH & CO. KG, DE Free format text: FORMER OWNER: BREHM, PETER, 91085 WEISENDORF, DE Effective date: 20140502 |
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