DE3023353A1 - Zwischenwirbel-totalprothese - Google Patents

Zwischenwirbel-totalprothese

Info

Publication number
DE3023353A1
DE3023353A1 DE19803023353 DE3023353A DE3023353A1 DE 3023353 A1 DE3023353 A1 DE 3023353A1 DE 19803023353 DE19803023353 DE 19803023353 DE 3023353 A DE3023353 A DE 3023353A DE 3023353 A1 DE3023353 A1 DE 3023353A1
Authority
DE
Germany
Prior art keywords
bearing body
spacer
bearing
recess
tab
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
Application number
DE19803023353
Other languages
English (en)
Other versions
DE3023353C2 (de
Inventor
Prof. Dr.med. Bernhard Georg St. Gallen Weber
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.)
Sulzer AG
Original Assignee
Sulzer AG
Gebrueder Sulzer 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 Sulzer AG, Gebrueder Sulzer AG filed Critical Sulzer AG
Publication of DE3023353A1 publication Critical patent/DE3023353A1/de
Application granted granted Critical
Publication of DE3023353C2 publication Critical patent/DE3023353C2/de
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30841—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
    • A61F2002/443—Intervertebral or spinal discs, e.g. resilient made of articulated components having two transversal endplates and at least one intermediate component

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Description

  • Zwischenwirbel-Totalprothese
  • Die Erfindung betrifft elr.e Zwischenwirbel-Totalprothese, insbesondere für Halswirbel, bei der in den einander zugewandten benachbarten Endflächen zweier Wirbel je ein, eine Gelenkpfanne enthaltender Lagerkörper mit mindestens im wesentlichen rechteckigem oder quadratischem Grundriss verankert ist, wobei zwischen die Lagerkörper ein Abstandskörper eingelegt ist.
  • Zwischenwirbel-Prothesen der genannten Art sind bekannt (DE-OS 28 04 936). Bei der bisherigen Konstruktion dieser Prothesen, die in erster Linie als Halswirbel-Prothesen verwendet werden, besteht die Gefahr, dass infolge der relativ grossen Beweglichkeit der Halswirbel der Abstandskörper, der bevorzugt in bekannter Weise im wesentlichen konvex linsenförmig ausgebildet ist, aus den Lagerpfannen herausgedrückt wird; in erster Linie bei Bewegungen, die mit Nicken des Kopfes" bezeichnet werden, kann der Abstandskörper relativ leicht nach hinten aus den bisherigen Lagerschalen herausgleiten. Aufgabe der Erfindung ist es daher, eine Zwischenwirbel-Totalprothese zu schaffen, bei der eine erhöhte Sicherheit gegen ein Herausgleiten des Abstandskörpers aus den pfannenartigen Ausnehmungen der Lagerkörper besteht.
  • Gemäss der vorliegenden Erfindung wird diese Aufgabe dadurch gelöst, dass jeder Lagerkörper in einer seiner Längsseiten, vom Niveau des Randes seiner Gelenkpfanne aus gesehen, eine Vertiefung und an der dazu parallelen Längsseite einen vorspringenden Lappen hat, wobei die Vertiefung und der Lappen so aufeinander abgestimmt sind, dass bei eingelegtem Abstandskörper der Lappen des einen Lagerkörpers in die Vertiefung des anderen Lagerkörpers eingreift.
  • Bei der neuen Konstruktion greifen die beiden Lagerkörper mit ihren dorsal und ventral gelegenen Seiten ineinander.
  • Dadurch ist ihre Gleitbewegung auf dem Abstandskörper weitgehend geführt, so dass Verschiebungen der Prothesenteile relativ zueinander nach vorne und nach hinten erschwert werden.Darüberhinaus ist der Abstandskörper durch den Lappen des einen Lagerkörpers, der auch bei Nickbewegungen den anderen Lagerkörper in dessen Vertiefung überlappt, "gefangen, wodurch ein Herausgleiten aus den Lagerpfannen vermieden wird.
  • Im folgenden wird die Erfindung anhand eines Ausführungsbeispiels im Zusammenhang mit der Zeichnung näher erläutert.
  • Fig. 1 zeigt als Ausführungsbeispiel eine Halswirbelprothese, die schematisch zwischen zwei Halswirbel eingesetzt ist, in einer Ansicht von hinten und teilweise im Schnitt; Fig. 2 ist der Schnitt II-II von Fig. 1.
  • In eine - beispielsweise mit einem Fräser hergestellte -Ausnehmung eines Wirbelkörpers 1, an dem auf beiden Seiten der Fig. 1 noch Ansätze 3 der Wirbelfortsätze angedeutet sind, ist ein Lagerkörper 4 eingesetzt, der beispielsweise einen rechteckigen oder quadratischen Grundriss hat.
  • In die äussere, d.h. dem benachbarten Wirbel 1 zugewandte, Oberfläche des Lagerkörpers 4 ist eine Gelenkpfanne 7 eingelassen, die in Form und Grösse an einen Abstandskörper 5 angepasst ist, der zwischen die Lagerkörper 4 zweier benachbarter Wirbelkörper 1 als Prothesenkörper eingelegt wird.
  • Der Abstandskörper 5 ist im vorliegenden Beispiel linsenförmig ausgebildet, kann aber auch eine Kugel, ein kugelähnlicher oder ein elliptischer Körper sein.
  • Jeder Lagerkörper 4 trägt auf seiner, den Wirbeln zugewandten rnrundfläch je zwei Verankerungszapfen 2, mit denen er in operativ vorbereitete Bohrungen der Wirbel 1 eingepresst oder eingeschlagen wird.
  • Betrachtet man die den Rand der Gelenkpfanne 7 enthaltende Ebene als Bezugsebene, so hat jeder Lagerkörper 4 entweder in seiner dorsalen oder ventralen Seite erfindungsgemäss eine Vertiefung 6, in die als Gegenstück ein vorspringender Lappen 8 des anderen Lagerkörpers 4 eingreift. Bei Aufwärts-und Abwärtsbewegungen des Kopfes verschieben sich die jeweils zusammenwirkende Vertiefung 6 und der Lappen 8 relativ zueinander; dabei taucht der Lappen 8 entweder tiefer in die Vertiefung 6 ein oder gleitet teilweise aus ihr heraus, ohne dass jedoch - besonders bei der Abwärtsbewegung - ein so grosser Spalt zwischen beiden entsteht, dass der Abstandskörper 5 nach hinten aus den Gelenkpfannen 7 herausgleiten kann.
  • Um auch bei seitlichen Kippbewegungen des Kopfes die Lagerkörper 4 in ihrer Bewegung zu führen, sind die Vertiefungen 6 zusätzlich mit schräg verlaufender Begrenzung 9 muldenförmig ausgebildet, der im wesentlichen parallel dazu verlaufende schräge Flanken 10 des Lappens 8 zugeordnet sind.
  • Die Lagerkörper 4 und der Abstandskörper 5 sind aus in der Implantat-Technik bewährten Werkstoffen hergestellt; insbesondere haben sich hochmolekulares Polyäthylen (HDPE) für die Lagerkörper 4 und Biokeramik, vor allem hochreines und dichtes A12031 für die Abstandskörper 5 bewährt.

Claims (2)

  1. Patentansprüche Zwischenwirbel-Totalprothese, insbesondere für Halswirbel, bei der in den einander zugewandten benachbarten Endflächen zweier Wirbel je ein, eine Gelenkpfanne tragender Lagerkörper mit mindestens im wesentlichen rechteckigem oder quadratischem Grundriss verankert ist, wobei zwischen die Lagerkörper ein Abstandskörper eingelegt ist, dadurch gekennzeichnet, dass jeder Lagerkörper (4) in einer seiner Längsseiten, vom Niveau des Randes seiner Gelenkpfanne (7) aus gesehen, eine Vertiefung (6) und an der dazu parallelen Längsseite einen vorspringenden Lappen (8) hat, wobei die Vertiefung (6) und der Lappen (8) so aufeinander abgestimmt sind, dass bei eingelegtem Abstandskörper (5) der Lappen (8) des einen Lagerkörpers (4) in die Vertiefung (6) des anderen Lagerkörpers (4) eingreift.
  2. 2. Prothese nach Anspruch l,dadurch gekennzeichnet, dass die Vertiefung (6) und der Lappen (8) mit schrägen, im wesentlichen parallel zueinander verlaufenden Begrenzungen (9) bzw. Flanken (10) versehen sind.
DE19803023353 1979-10-03 1980-06-21 Zwischenwirbel-Totalprothese Expired DE3023353C2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH890679A CH640131A5 (en) 1979-10-03 1979-10-03 Complete intervertebral prosthesis

Publications (2)

Publication Number Publication Date
DE3023353A1 true DE3023353A1 (de) 1981-04-09
DE3023353C2 DE3023353C2 (de) 1982-04-22

Family

ID=4346106

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19803023353 Expired DE3023353C2 (de) 1979-10-03 1980-06-21 Zwischenwirbel-Totalprothese

Country Status (2)

Country Link
CH (1) CH640131A5 (de)
DE (1) DE3023353C2 (de)

Cited By (101)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042271A1 (de) * 1980-06-13 1981-12-23 David J. Kuntz Zwischenwirbel-Scheibenprothese
US4553273A (en) * 1983-11-23 1985-11-19 Henry Ford Hospital Vertebral body prosthesis and spine stabilizing method
EP0176728A1 (de) * 1984-09-04 1986-04-09 Humboldt-Universität zu Berlin Bandscheibenendoprothese
EP0260044A1 (de) * 1986-08-29 1988-03-16 John Anthony Norman Shepperd Rückgratimplantat
EP0317972A1 (de) * 1987-11-24 1989-05-31 Asahi Kogaku Kogyo Kabushiki Kaisha Künstliche Zwischenwirbelscheibe
US4874389A (en) * 1987-12-07 1989-10-17 Downey Ernest L Replacement disc
FR2659226A1 (fr) * 1990-03-07 1991-09-13 Jbs Sa Prothese pour disques intervertebraux et ses instruments d'implantation.
US5062850A (en) * 1990-01-16 1991-11-05 University Of Florida Axially-fixed vertebral body prosthesis and method of fixation
US5071437A (en) * 1989-02-15 1991-12-10 Acromed Corporation Artificial disc
US5147404A (en) * 1987-12-07 1992-09-15 Downey Ernest L Vertebra prosthesis
DE4213771C1 (de) * 1992-04-27 1993-09-30 Eska Medical Gmbh & Co Bandscheibenendoprothese
EP0566810A1 (de) * 1992-04-21 1993-10-27 SULZER Medizinaltechnik AG Künstlicher Bandscheibenkörper
FR2694882A1 (fr) * 1992-08-24 1994-02-25 Sofamor Prothèse discale intervertébrale.
US5401269A (en) * 1992-03-13 1995-03-28 Waldemar Link Gmbh & Co. Intervertebral disc endoprosthesis
US5507816A (en) * 1991-12-04 1996-04-16 Customflex Limited Spinal vertebrae implants
US5534029A (en) * 1992-12-14 1996-07-09 Yumiko Shima Articulated vertebral body spacer
FR2730159A1 (fr) * 1995-02-06 1996-08-09 Teule Jean Germain Prothese pour disque intervertebral
EP0754018A1 (de) * 1992-01-06 1997-01-22 Danek Medical, Inc. Arthroplastische vorrichtung als bandscheibenersatz
US5674296A (en) * 1994-11-14 1997-10-07 Spinal Dynamics Corporation Human spinal disc prosthesis
US5676701A (en) * 1993-01-14 1997-10-14 Smith & Nephew, Inc. Low wear artificial spinal disc
EP1057462A1 (de) 1999-05-21 2000-12-06 Waldemar Link (GmbH & Co.) Zwischenwirbel-Endoprothese mit einer gezahnten Anschlussplatte
FR2824261A1 (fr) * 2001-05-04 2002-11-08 Ldr Medical Prothese de disque intervertebral et procede et outils de mise en place
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WO2004019828A1 (de) * 2002-09-02 2004-03-11 Mathys Medizinaltechnik Ag Zwischenwirbelimplantat mit dreiteiligem gelenk
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