WO1989007424A1 - Osteosynthetic fastener for anchoring in bones - Google Patents

Osteosynthetic fastener for anchoring in bones Download PDF

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Publication number
WO1989007424A1
WO1989007424A1 PCT/DE1989/000087 DE8900087W WO8907424A1 WO 1989007424 A1 WO1989007424 A1 WO 1989007424A1 DE 8900087 W DE8900087 W DE 8900087W WO 8907424 A1 WO8907424 A1 WO 8907424A1
Authority
WO
WIPO (PCT)
Prior art keywords
bone
fastener
elasticity
modulus
osteosynthetic
Prior art date
Application number
PCT/DE1989/000087
Other languages
German (de)
French (fr)
Inventor
Dietmar Pennig
Original Assignee
Dietmar Pennig
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 Dietmar Pennig filed Critical Dietmar Pennig
Publication of WO1989007424A1 publication Critical patent/WO1989007424A1/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
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/866—Material or manufacture

Definitions

  • the invention relates to a fastener according to the preamble of the main claim.
  • the modulus of elasticity of the fastening means is fundamentally different from the modulus of elasticity of a bone, i. H. these fastening means take no account of the bone and, viewed over the longitudinal axis of the bone, the elasticity modules of a bone are also different in their areas, just as the bone elasticity is age-dependent.
  • the invention has for its object to provide a fastener in which a movement of the fastener in the bone no longer occurs after fixation.
  • the fastener z. B. for an external fixator is no longer rigid, in particular not more rigid than the bone, but that the fastener is adapted in terms of its modulus of elasticity to the modulus of elasticity of the bone, preferably also proceeding in such a way that in the case of fasteners to be used in different bone areas, the modulus of elasticity these fasteners can also be selected differently in adaptation to the bone area.
  • the fastener With the design of the fastener according to the invention it is achieved that a relative movement between the fastener and the bone edge is no longer possible, so that the dreaded knocking out the edge area of the bone due to the rigid fastener is avoided. This further ensures that the fastener is better anchored in the bone over a longer period than in the prior art. In addition, damage to the bone is avoided, which can lead to postoperative diseases in the bone.
  • fastener from a material having a correspondingly selected modulus of elasticity is no longer a problem.
  • fasteners can now be made from known materials. H. they have the same load-bearing properties, but are more elastic than steel.

Abstract

Known osteosynthetic fasteners possess elastic properties basically different from those of bone. This results in damage to the edge regions of the bone and consequent loosening of the fastener. To eliminate this drawback, a fastener has a modulus of elasticity which matches that of the bone, so that in the region of contact between bone and fastener, the moduli of elasticity are substantially equal.

Description

"Befestigungsmittel, das bei der Osteosynthese im Knochen verankert wird" "Fasteners that are anchored in the bone during osteosynthesis"
Die Erfindung bezieht sich auf ein Befestigungsmittel gemäß dem Oberbegriff des Hauptanspruches.The invention relates to a fastener according to the preamble of the main claim.
Zum Beispiel in der DE-32 29 313 AI wird eine äußere Fixierungsvorrichtung für Knochenbrüche dargestellt und beschrieben, bei welcher eine Stützschiene ausserhalb des Fleisches des Schienbeines angeordnet ist und in die beiden gebrochenen Schienbeinteile Knochenhaltestifte eingeführt sind, die über die äußere Stützschiene eine Fixierung des Knochens ermöglichen. In gleicher Weise sind innere Fixierungsvorrichtungen bekannt, die als Platten ausgebildet sind und beispielsweise über Schrauben am zu fixierenden Knochenbereich festgelegt werden.For example, in DE-32 29 313 AI an external fixation device for broken bones is shown and described, in which a support splint is arranged outside the flesh of the tibia and bone retaining pins are inserted into the two broken tibia parts, which fix the bone via the external support splint enable. In the same way, internal fixation devices are known which are designed as plates and are fixed, for example, to the bone area to be fixed by means of screws.
Der Elastizitätsmodul der Befestigungsmittel ist aber grundsätzlich unterschiedlich vom Elastizitätsmodul eines Knochens, d. h. diese Befestigungsmittel nehmen keine Rücksicht auf den Knochen und über die Knochenlängsachse gesehen sind die Elastizitätsmodule eines Knochens in ihren Bereichen ebenfalls wieder unterschiedlich, genauso, wie die Knochenelastizität altersabhängig ist.The modulus of elasticity of the fastening means is fundamentally different from the modulus of elasticity of a bone, i. H. these fastening means take no account of the bone and, viewed over the longitudinal axis of the bone, the elasticity modules of a bone are also different in their areas, just as the bone elasticity is age-dependent.
Diese unterschiedlichen elastischen Verhältnisse bei der Stabilisierung einer Knochenfraktur zwischen Befestigungsmittel und dem Knochen führen dazu, daß bei Beanspruchung des Knochens die Befestigungsmittel sich im Knochenrandbereich einen "Bewegungstrichter" schaffen oder eine anders geartete Schwächung des Knochens eintritt, was häufig dazu führt, daß eine sichere und einwandfreie Verankerung nach gewisser Benutzungsdauer nicht mehr gegeben ist.These different elastic relationships The stabilization of a bone fracture between the fastening means and the bone leads to the fastening means creating a "movement funnel" in the area of the bone edge or a different kind of weakening of the bone, which often leads to a safe and perfect anchoring after a certain period of use is no longer given.
Der Erfindung liegt die Aufgabe zugrunde, ein Befestigungsmittel zu schaffen, bei welchem ein Bewegen des Befestigungsmittels im Knochen nach der Fixation nicht mehr auftritt.The invention has for its object to provide a fastener in which a movement of the fastener in the bone no longer occurs after fixation.
Diese der Erfindung zugrundeliegende Aufgabe wird durch die Lehre des Patentanspruches 1 gelöst.This object on which the invention is based is achieved by the teaching of patent claim 1.
Mit anderen Worten ausgedrückt, wird gemäß der Erfindung vorgeschlagen, daß das Befestigungsmittel z. B. für eine Fixateurexterne nunmehr nicht mehr starr ist, insbesondere nicht starrer als der Knochen, sondern daß das Befestigungsmittel hinsichtlich seines Elastizitätsmoduls an den Elastizitätsmodul des Knochens angepaßt wird, wobei vorzugsweise dabei auch so vorgegangen wird, daß bei in unterschiedliche Knochenbereiche einzusetzenden Befestigungsmitteln die Elastizitätsmodule dieser Befestigungsmittel ebenfalls in Anpassung an den Knochenbereich unterschiedlich gewählt werden.In other words, it is proposed according to the invention that the fastener z. B. for an external fixator is no longer rigid, in particular not more rigid than the bone, but that the fastener is adapted in terms of its modulus of elasticity to the modulus of elasticity of the bone, preferably also proceeding in such a way that in the case of fasteners to be used in different bone areas, the modulus of elasticity these fasteners can also be selected differently in adaptation to the bone area.
Mit der erfindungsgemäßen Gestaltung des Befestigungsmittels wird erreicht, daß eine Relativbewegung zwischen Befestigungsmittel und Knochenrand nicht mehr möglich ist, so daß das gefürchtete Ausschlagen des Randbereiches des Knochens, bedingt durch das starre Befestigungsmittel, vermieden wird. Hierdurch wird weiterhin sichergestellt, daß das Befestigungsmittel besser als im Stand der Technik über längere Zeit im Knochen verankert ist. Außerdem werden Schädigungen des Knochens vermieden, die zu postoperativen Krankheitsbildern am Knochen führen können.With the design of the fastener according to the invention it is achieved that a relative movement between the fastener and the bone edge is no longer possible, so that the dreaded knocking out the edge area of the bone due to the rigid fastener is avoided. This further ensures that the fastener is better anchored in the bone over a longer period than in the prior art. In addition, damage to the bone is avoided, which can lead to postoperative diseases in the bone.
Die Erstellung des Befestigungsmittels aus einem einen entsprechend ausgewählten Elastizitätsmodul aufweisenden Werkstoff stellt heute keine Schwierigkeit mehr dar. So können beispielsweise derartige Befestigungsmittel heute aus bekannten Werkstoffen erstellt werden, d. h. sie weisen die gleichen Tragfähigkeitseigenschaften auf, sind aber gegenüber Stahl elastischer. The creation of the fastener from a material having a correspondingly selected modulus of elasticity is no longer a problem. For example, such fasteners can now be made from known materials. H. they have the same load-bearing properties, but are more elastic than steel.

Claims

Patentansprüche: Claims:
1. Befestigungsmittel, das bei der Osteosynthese im Knochen verankert wird und als Schraube, Knochenhaltestift oder Pin ausgebildet ist, dadurch gekennzeichnet, daß das schräg oder im rechten Winkel zur Längsachse des Knochens zu verankernde Befestigungsmittel aus einem elastischen Werkstoff erstellt ist, dessen Elastizitätsmodul dem Elastizitätsmodul des Knochens an gepaßt i s t, i n dem das Befesti gungsmi ttel angeordnet werden so! 1.1. fastener which is anchored in the bone during osteosynthesis and is designed as a screw, bone retaining pin or pin, characterized in that the fastener to be anchored obliquely or at right angles to the longitudinal axis of the bone is made of an elastic material, the modulus of elasticity of which is the modulus of elasticity of the bone is fitted, in which the fastening means are arranged so! 1.
2. Befestigungsmittel nach Anspruch 1, dadurch gekennzeichnet, daß der Elastizitätsmodul des Werkstoffs dem Elastizitätsmodul des Knochenbereiches angepaßt ist, in dem das Befestigungsmittel angeordnet werden soll. 2. Fastening device according to claim 1, characterized in that the modulus of elasticity of the material is adapted to the modulus of elasticity of the bone region in which the fastener is to be arranged.
PCT/DE1989/000087 1988-02-20 1989-02-16 Osteosynthetic fastener for anchoring in bones WO1989007424A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883805303 DE3805303C1 (en) 1988-02-20 1988-02-20
DEP3805303.9 1988-02-20

Publications (1)

Publication Number Publication Date
WO1989007424A1 true WO1989007424A1 (en) 1989-08-24

Family

ID=6347791

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1989/000087 WO1989007424A1 (en) 1988-02-20 1989-02-16 Osteosynthetic fastener for anchoring in bones

Country Status (4)

Country Link
EP (1) EP0383840A1 (en)
JP (1) JPH02502977A (en)
DE (1) DE3805303C1 (en)
WO (1) WO1989007424A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4997444A (en) * 1989-12-28 1991-03-05 Zimmer, Inc. Implant having varying modulus of elasticity

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE174204T1 (en) * 1993-10-21 1998-12-15 Sulzer Orthopaedie Ag KIT FOR A MODULAR FEMURAL HEAD PROSTHESIS, IN PARTICULAR A REOPERATIVE PROSTHESIS, AND FEMURAL HEAD PROSTHESIS FROM SUCH A KIT
DE19635975C1 (en) * 1996-09-05 1998-07-30 Richard Dipl Ing Skiera Fastening device for bones and bone fragments

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4338926A (en) * 1980-11-21 1982-07-13 Howmedica, Inc. Bone fracture prosthesis with controlled stiffness
US4356572A (en) * 1979-07-12 1982-11-02 Etablissement Public Dit: Agence Nationale De Valorisation De La Recherche (Anvar) Biodegradable implant useable as a bone prosthesis
GB2146535A (en) * 1983-09-20 1985-04-24 Materials Consultants Oy Device for immobilising bone fractures
EP0149540A2 (en) * 1984-01-13 1985-07-24 Ed. Geistlich Söhne Ag Für Chemische Industrie Improvements in or relating to bone fracture fixation plates

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4502473A (en) * 1981-08-06 1985-03-05 National Research Development Corp. Apparatus for external fixation of bone fractures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356572A (en) * 1979-07-12 1982-11-02 Etablissement Public Dit: Agence Nationale De Valorisation De La Recherche (Anvar) Biodegradable implant useable as a bone prosthesis
US4338926A (en) * 1980-11-21 1982-07-13 Howmedica, Inc. Bone fracture prosthesis with controlled stiffness
GB2146535A (en) * 1983-09-20 1985-04-24 Materials Consultants Oy Device for immobilising bone fractures
EP0149540A2 (en) * 1984-01-13 1985-07-24 Ed. Geistlich Söhne Ag Für Chemische Industrie Improvements in or relating to bone fracture fixation plates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4997444A (en) * 1989-12-28 1991-03-05 Zimmer, Inc. Implant having varying modulus of elasticity

Also Published As

Publication number Publication date
JPH02502977A (en) 1990-09-20
DE3805303C1 (en) 1989-06-01
EP0383840A1 (en) 1990-08-29

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