CH702636A1 - Point-symmetric plastic rod for surgical treatment of spinal column to dynamically stabilize spinal column, has two regions with different rigidities in longitudinal direction and connected with each other by adhesives, welds or combination - Google Patents

Point-symmetric plastic rod for surgical treatment of spinal column to dynamically stabilize spinal column, has two regions with different rigidities in longitudinal direction and connected with each other by adhesives, welds or combination Download PDF

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Publication number
CH702636A1
CH702636A1 CH00132/10A CH1322010A CH702636A1 CH 702636 A1 CH702636 A1 CH 702636A1 CH 00132/10 A CH00132/10 A CH 00132/10A CH 1322010 A CH1322010 A CH 1322010A CH 702636 A1 CH702636 A1 CH 702636A1
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CH
Switzerland
Prior art keywords
spinal column
regions
plastic rod
welds
adhesives
Prior art date
Application number
CH00132/10A
Other languages
German (de)
Inventor
Stefan Freudiger
Rolf Diener
Original Assignee
Spinesave Ag
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 Spinesave Ag filed Critical Spinesave Ag
Priority to CH00132/10A priority Critical patent/CH702636A1/en
Publication of CH702636A1 publication Critical patent/CH702636A1/en

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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
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7031—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other made wholly or partly of flexible material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00526—Methods of manufacturing

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Surgical Instruments (AREA)

Abstract

The plastic rod has two regions including different rigidities in a longitudinal direction along a longitudinal axis. The regions are connected with each other by adhesives, welds or combination of adhesives and welds using a heating process and a moving process e.g. vibration process and ultrasound process. The regions are formed by spraying different granulates using an injection molding process. The plastic rod is made of polycarbonate urethane. Plates and reflectors are used in the heating process.

Description

[0001] Mit der vorliegenden Erfindung wird ein elastischer Verbindungsstab entsprechend Patentanspruch eins realisiert, welcher entlang seiner Längsachse unterschiedliche Steifigkeiten aufweist. Elastische Verbindungsstäbe werden typischerweise in Verbindung mit Pedikelschrauben zur dynamischen Stabilisierung von Wirbelsäulen verwendet. Kann einem solchen Stab ein Bereich erhöhter Steifigkeit verliehen werden, dann kann das Indikationsgebiet stark erweitert werden. Ein Bereich erhöhter Steifigkeit kann dann zur Fusion eines Wirbelkörpers, während ein Bereich geringerer Steifigkeit zum elastischen Anschluss eines Nachbarsegmentes verwendet wird. With the present invention, an elastic connecting rod according to claim one is realized, which has different stiffness along its longitudinal axis. Elastic connecting rods are typically used in conjunction with pedicle screws for dynamic stabilization of spinal columns. If such a rod can be given a range of increased rigidity, then the indication area can be greatly expanded. A region of increased stiffness may then be used to fuse a vertebral body, while a region of lesser rigidity is used to elastically connect a neighboring segment.

[0002] Der «goldene Standard» in der Wirbelsäulenchirurgie besteht heute noch in der Fusion (Versteifung) pathologischer Wirbelkörper. Versteifungen führen jedoch häufig zu vorzeitiger Degeneration der zur Fusion benachbarten Segmenten. Daher sind Bestrebungen im Gange, Stäbe mit unterschiedlichen Steifigkeiten anzubieten und Nachbarsegmente in die chirurgische Versorgung miteinzubeziehen. The "golden standard" in spinal surgery today still consists in the fusion (stiffening) of pathological vertebral bodies. Stiffening, however, often results in premature degeneration of the segments adjacent to fusion. Therefore, efforts are underway to offer rods with different stiffnesses and to include adjacent segments in the surgical care.

[0003] Die bisher bekannten Lösungsansätze betreffen vor allem Kombinationen von Metall- mit Kunststoffstäben, wie im Folgenden aufgezeigt. The previously known approaches mainly affect combinations of metal and plastic rods, as shown below.

[0004] Die Erfindung gemäss Patentanmeldung EP 1 719 468 verbindet einen Metallstab mit einem textilen Band, welches als innseitige Zugstruktur in einem aussenseitigen Kunststoffkissen als angeschlossene dynamische Stabilisierung wirken soll. The invention according to patent application EP 1 719 468 connects a metal rod with a textile tape, which should act as an internal tensile structure in an external plastic cushion as connected dynamic stabilization.

[0005] Die Erfindung gemäss Patentschrift EP 1 815 812 bietet am Ende eines Metallstabes eine Aufnahme für einen anschliessbaren Kunststoffstab. The invention according to patent EP 1 815 812 offers at the end of a metal rod a receptacle for a connectable plastic rod.

[0006] Einzig die Erfindung gemäss Patentanmeldung US 2009/0 118 767 zeigt ein Verbindungselement mit variabler Steifigkeit entlang seiner Längsachse. Hierbei beschränkt sich die variable Steifigkeit auf den Bereich zwischen zwei Verankerungselementen, indem lediglich der äussere Körper des Verbindungselementes in seiner Steifigkeit variiert wird. Only the invention according to patent application US 2009/0 118 767 shows a connecting element with variable stiffness along its longitudinal axis. Here, the variable stiffness is limited to the area between two anchoring elements, by only the outer body of the connecting element is varied in its rigidity.

[0007] Die im Folgenden beschriebene Erfindung stellt sich demnach die Aufgabe, einen biokompatiblen Kunststoffstab in der Weise anzubieten, dass sich die Steifigkeit entlang seiner Längsachse in mindestens zwei Bereichen unterscheidet. The invention described below accordingly has the task of offering a biocompatible plastic rod in such a way that the stiffness differs along its longitudinal axis in at least two areas.

[0008] Eine erste Lösung dieser Aufgabe zeichnet sich dadurch aus, dass Stäbe verschiedener Steifigkeiten stirnseitig unter Einsatz geeigneter Lösungsmittel verbunden werden. A first solution to this problem is characterized in that rods of different stiffnesses are connected to the front side using suitable solvents.

[0009] Eine zweite Lösung dieser Aufgabe zeichnet sich dadurch aus, dass Stäbe verschiedener Steifigkeiten stirnseitig verschweisst werden. In Frage kommen Heizverfahren (zum Beispiel Platten oder Spiegel), Bewegungsverfahren (zum Beispiel Vibration oder Ultraschall) oder eine Kombination der beiden. A second solution to this problem is characterized in that rods of different stiffnesses are welded frontally. Heating methods (for example plates or mirrors), motion methods (for example vibration or ultrasound) or a combination of the two are possible.

[0010] Eine dritte Lösung dieser Aufgabe zeichnet sich dadurch aus, dass Granulate verschiedener Steifigkeiten im Spritzgussverfahren stirnseitig gegeneinander gespritzt werden. A third solution to this problem is characterized in that granules of different stiffness in the injection molding process are sprayed against each other frontally.

[0011] Der Gegenstand der Erfindung ist folglich der im Patentanspruch eins definierte Stab mit variierender Steifigkeit. The object of the invention is therefore defined in claim one rod with varying rigidity.

[0012] Die vorliegende Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert, welche lediglich Ausführungsbeispiele darstellen und insbesondere nicht die maximal mögliche Anzahl unterschiedlicher aneinander gereihten Steifigkeiten zeigen. The present invention will be explained in more detail with reference to drawings, which represent only exemplary embodiments and in particular do not show the maximum possible number of different juxtaposed rigidities.

[0013] Es zeigen schematisch: <tb>Fig. 1<sep>einen punktsymmetrischen Stab mit Bereichen unterschiedlicher Steifigkeiten.Schematically show: <Tb> FIG. 1 <sep> a point-symmetric rod with regions of different stiffnesses.

Claims (7)

1. Kunststoffstab für die chirurgische Versorgung der Wirbelsäule dadurch gekennzeichnet, dass dieser in Längsrichtung aus mindestens zwei Bereichen unterschiedlicher Steifigkeiten besteht.1. plastic rod for the surgical treatment of the spine, characterized in that it consists of at least two regions of different stiffness in the longitudinal direction. 2. Kunststoffstab nach Anspruch 1, dadurch gekennzeichnet, dass die Bereiche durch Kleben miteinander verbunden sind.2. Plastic rod according to claim 1, characterized in that the areas are joined together by gluing. 3. Kunststoffstab nach Anspruch 1, dadurch gekennzeichnet, dass die Bereiche durch Schweissen miteinander verbunden sind.3. Plastic rod according to claim 1, characterized in that the regions are connected to each other by welding. 4. Kunststoffstab nach Anspruch 1, dadurch gekennzeichnet, dass die Bereiche durch eine Kombination von Kleben und Schweissen miteinander verbunden sind.4. Plastic rod according to claim 1, characterized in that the areas are connected by a combination of bonding and welding. 5. Kunststoffstab nach Anspruch 1, dadurch gekennzeichnet, dass die Bereiche durch Aufspritzen unterschiedlichen Granulates erzielt werden.5. Plastic rod according to claim 1, characterized in that the areas are achieved by spraying different granules. 6. Kunststoffstab nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Stab mehr als zwei Bereiche unterschiedlicher Steifigkeiten aufweist.6. Plastic rod according to one of claims 1 to 5, characterized in that the rod has more than two regions of different stiffnesses. 7. Kunststoffstab nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Stab aus Polycarbonateurethane gefertigt ist.7. Plastic rod according to one of claims 1 to 6, characterized in that the rod is made of polycarbonate urethanes.
CH00132/10A 2010-02-04 2010-02-04 Point-symmetric plastic rod for surgical treatment of spinal column to dynamically stabilize spinal column, has two regions with different rigidities in longitudinal direction and connected with each other by adhesives, welds or combination CH702636A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH00132/10A CH702636A1 (en) 2010-02-04 2010-02-04 Point-symmetric plastic rod for surgical treatment of spinal column to dynamically stabilize spinal column, has two regions with different rigidities in longitudinal direction and connected with each other by adhesives, welds or combination

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00132/10A CH702636A1 (en) 2010-02-04 2010-02-04 Point-symmetric plastic rod for surgical treatment of spinal column to dynamically stabilize spinal column, has two regions with different rigidities in longitudinal direction and connected with each other by adhesives, welds or combination

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CH702636A1 true CH702636A1 (en) 2011-08-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014005236A1 (en) * 2012-07-05 2014-01-09 Spinesave Ag Elastic rod having different degrees of stiffness for the surgical treatment of the spine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032533A1 (en) * 1996-03-05 1997-09-12 Neurofix Spinal osteosynthesis device
US20050203513A1 (en) * 2003-09-24 2005-09-15 Tae-Ahn Jahng Spinal stabilization device
WO2007038429A1 (en) * 2005-09-27 2007-04-05 Endius, Inc. Methods and apparatuses for stabilizing the spine through an access device
DE102005061368B3 (en) * 2005-12-13 2007-07-12 Aesculap Ag & Co. Kg Implantable connecting element and surgical fixation system
US20080177388A1 (en) * 2007-01-18 2008-07-24 Warsaw Orthopedic, Inc. Variable Stiffness Support Members
US20080306536A1 (en) * 2007-06-08 2008-12-11 Robert Frigg Dynamic stabilization system
US20090248083A1 (en) * 2008-03-26 2009-10-01 Warsaw Orthopedic, Inc. Elongated connecting element with varying modulus of elasticity
EP2113216A1 (en) * 2008-04-28 2009-11-04 BIEDERMANN MOTECH GmbH Rod-shaped element, in particular for spinal stabilization, method and tool for producing the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032533A1 (en) * 1996-03-05 1997-09-12 Neurofix Spinal osteosynthesis device
US20050203513A1 (en) * 2003-09-24 2005-09-15 Tae-Ahn Jahng Spinal stabilization device
WO2007038429A1 (en) * 2005-09-27 2007-04-05 Endius, Inc. Methods and apparatuses for stabilizing the spine through an access device
DE102005061368B3 (en) * 2005-12-13 2007-07-12 Aesculap Ag & Co. Kg Implantable connecting element and surgical fixation system
US20080177388A1 (en) * 2007-01-18 2008-07-24 Warsaw Orthopedic, Inc. Variable Stiffness Support Members
US20080306536A1 (en) * 2007-06-08 2008-12-11 Robert Frigg Dynamic stabilization system
US20090248083A1 (en) * 2008-03-26 2009-10-01 Warsaw Orthopedic, Inc. Elongated connecting element with varying modulus of elasticity
EP2113216A1 (en) * 2008-04-28 2009-11-04 BIEDERMANN MOTECH GmbH Rod-shaped element, in particular for spinal stabilization, method and tool for producing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014005236A1 (en) * 2012-07-05 2014-01-09 Spinesave Ag Elastic rod having different degrees of stiffness for the surgical treatment of the spine
US10695097B2 (en) 2012-07-05 2020-06-30 Spinesave Ag Elastic rod having different degrees of stiffness for the surgical treatment of the spine

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