EP0999795A1 - Dispositif pour le raidissement ou la correction de la colonne vertebrale ou autre - Google Patents

Dispositif pour le raidissement ou la correction de la colonne vertebrale ou autre

Info

Publication number
EP0999795A1
EP0999795A1 EP98939650A EP98939650A EP0999795A1 EP 0999795 A1 EP0999795 A1 EP 0999795A1 EP 98939650 A EP98939650 A EP 98939650A EP 98939650 A EP98939650 A EP 98939650A EP 0999795 A1 EP0999795 A1 EP 0999795A1
Authority
EP
European Patent Office
Prior art keywords
anchoring element
anchoring
clamping means
passage
spacer sleeves
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Withdrawn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
EP98939650A
Other languages
German (de)
English (en)
Inventor
Hans Schmotzer
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.)
Smith and Nephew Orthopaedics AG
Original Assignee
Plus Endoprothetik 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
Priority claimed from DE19738968A external-priority patent/DE19738968B4/de
Application filed by Plus Endoprothetik AG filed Critical Plus Endoprothetik AG
Publication of EP0999795A1 publication Critical patent/EP0999795A1/fr
Withdrawn legal-status Critical Current

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
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7008—Longitudinal elements, e.g. rods with a cross-section which varies along its length with parts of, or attached to, the longitudinal elements, bearing against an outside of the screw or hook heads, e.g. nuts on threaded rods
    • 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
    • A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
    • 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
    • A61B17/702—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other having a core or insert, and a sleeve, whereby a screw or hook can move along the core or in the sleeve
    • 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
    • A61B17/7034—Screws or hooks with U-shaped head or back through which longitudinal rods pass characterised by a lateral opening

Definitions

  • the invention relates to a device for stiffening and / or correcting a bone framework or section consisting of at least two bones or bone fragments or a spinal column section consisting of at least two vertebrae, with at least two anchoring elements for a connecting element which can be fastened to a bone or vertebra on the anchoring element fixable, cable, wire or rod-shaped tensioning means as well as spacer sleeves which can be pushed over them and which hold adjacent anchoring elements at a predetermined distance when tension is exerted on the tensioning means.
  • Such a device is known from WO 94/17745 in connection with the correction of a spinal column section.
  • This known device is characterized by a high degree of flexibility with permanent functional reliability. It is also simple from an operational point of view and permits subsequent position corrections.
  • the present invention has for its object to improve the known device in terms of flexibility.
  • each spacer sleeve facing the anchoring elements are preferably complementary to the corresponding support surface on the anchoring element, i. H. spherically concave or convex. This ensures a flat support of the spacer sleeves on the convex or concave arched support surfaces of the anchoring elements.
  • a particularly preferred embodiment of the device according to the invention is characterized in that the head of the anchoring element protruding from the bone or vertebra is spherical, it being mentioned at this point that the anchoring element can either be a pedicle screw or a pedicle hook. In the former case, the head of the pedicle screw is a spherical head.
  • these or their heads each have a passage, in particular a through hole with conical or trumpet-like outlets or outlets for the tensioning means.
  • the clamping means can thus enter or exit the anchoring element without constraint within a predetermined solid angle of up to 15 to 25 degrees.
  • the passage or the through hole is accessible or evident over its or its entire length through a gap, so that the clamping means can be inserted into the passage in the direction transverse to the longitudinal direction of the passage.
  • the anchoring tion element are first attached to the associated bone or vertebral bone. Only then is the fixation device, including the clamping sleeves, fixed to the anchoring elements. In this embodiment, the anchoring elements do not therefore have to be threaded onto the clamping device beforehand.
  • a particularly simple embodiment is the first-mentioned alternative, which has a gap for inserting the tensioning means, which extends over the length of the passage in the anchoring element.
  • the anchoring element is formed in two or more parts in such a way that the passage in the anchoring element can be opened over its entire length for inserting the clamping means. Then the passage is “capped” again, so that a radially closed passage is created.
  • the passages in the spacer sleeves preferably have conical or trumpet-like outwardly widening inlet or outlet openings in order to ensure that the tensioning means passes freely from the spacer sleeve into the passage of the anchoring element or vice versa in the area of the support of the spacer sleeves on the associated anchoring element .
  • the device comprises support balls which can be placed on the clamping means, in particular split balls (with a continuous longitudinal gap), which can each be inserted between two spacer sleeves in order to change or adapt the distance length by lining up two or more spacer sleeves of the same or different lengths.
  • the support balls mentioned each have a passage corresponding to the passage on the anchoring elements for the cable, wire or rod-shaped tensioning means. The support balls are thus threaded onto the clamping means, in each case between two successive spacer sleeves.
  • clamping means anchoring part of each anchoring Rungselements, in particular the ball head of a ball-head pedicle screw to rotatably support an axis extending transversely to the longitudinal extension of the clamping means or about the longitudinal axis of the pedicle screw.
  • the anchoring part of a z. B. marked in a vertebral screw pedicle screw is spherical.
  • the top of the ball head 11 is flattened.
  • an internal hexagon (not shown here) is formed, into which a complementary screwing tool can be inserted. This will screw the pedicle screw into the vertebra.
  • the head 11 of the pedicle screw 10 has a passage in the form of a through hole 12, each with conically widening inlet and outlet openings 13, 14.
  • a cable or wire-like clamping means 15 is placed, which after implantation Train stands.
  • Spacer sleeves 16 are pushed over the clamping means 15, by means of which adjacent anchoring elements, here pedicle screws 10, are held at a predetermined distance when tension is exerted on the cable-like or wire-like clamping means 15.
  • the spacer sleeves 16 are supported on the spherical surface of the screw head 11.
  • the end faces 17 of the spacer sleeves 16 facing the spherical head 11 of the pedicle screw 10 are complementary to that, ie spherically concave, in accordance with the spherical support surface. This is a flat support of the spacer sleeves on the ball head 11 of the pedicle screw 10 possible at different angles, as indicated by the double bow arrows 18 in the attached drawing.
  • the angle at which the spacer sleeves 16 are supported on the ball head 11 of the pedicle screw 10 corresponds to the entry or exit angle of the cable-like or wire-like clamping means 15 from the through bore 12 in the ball head 11.
  • the maximum clamping device out or Entry angle is defined by the cone of the entry or exit opening 13, 14.
  • the passages 19 in the spacer sleeves 16 also have conical or trumpet-like outwardly widening inlet and outlet openings 20 in order to provide a non-constrained passage of the cable or to ensure wire-like clamping means 15 from the spacer sleeve 16 into the passage 12 of the anchoring element or here ball head 11 of the pedicle screw 10 or vice versa.
  • This constraint-free transition can be seen very clearly in the attached drawing.
  • a pedicle hook can also serve as anchoring element.
  • the ball head 10 is rotatably mounted about the pedicle screw longitudinal axis 21. This gives the surgeon even more degrees of freedom with regard to the alignment of clamping devices and spacer sleeves.
  • support balls are to be arranged between two adjacent spacer sleeves, these are designed in accordance with the ball head 11 of the pedicle screw 10.
  • the ball head 11 is formed in one piece and is an integral part of the pedicle screw 10. This is first screwed into the vertebral bone during implantation and aligned with respect to the passage 12. Then the threading of the cable or wire like clamping means 15, on which the spacer sleeves 16 are then pushed in each case.
  • the clamping means 15 has a thickening which is supported in the passage 12 of the anchoring element located at one end of the spinal column section to be stiffened, while the other end comprises a threaded section onto which a clamping nut can be screwed.
  • the clamping nut is supported either directly or indirectly via a short spacer sleeve on the anchoring element assigned to the other end of the spinal column section to be stiffened.
  • a threaded rod can also be used as the clamping means 15, i. H. a rod with an external thread extending over the entire length.
  • This embodiment has the advantage that the threaded rod can be cut to length according to the needs at the site of the implantation.
  • the ball head 11 of the pedicle screw 10 In order to avoid the aforementioned threading of the clamping means into the passage 12 of the anchoring part, here the ball head 11 of the pedicle screw 10, it can be provided that the ball head 11 is formed in two parts, so that the passage 11 can be opened over its entire length for inserting the clamping means 15 , or to provide a longitudinal gap in the ball head 11, via which the clamping means 15 can also be inserted into the passage 12. In this embodiment, the clamping means 15 is virtually hooked or suspended in the passage 12.
  • the tensioning means 15 can be designed as a flexible cable, in particular a cable-like braided cable.
  • the clamping means 15 is - as already mentioned above - under tension, while the spacer sleeves 16 are under pressure.
  • the described device is suitable not only for stiffening and / or correcting a spinal column section, but also for stiffening or correcting the bone structure or a bone fracture in general, in particular also as part of an external fixator or an intramedullary nail. However, the system described is particularly suitable for the correction and / or stiffening of a spinal column section.

Landscapes

  • 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)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)

Abstract

L'invention concerne un dispositif pour le raidissement ou la correction d'une ossature ou d'un segment osseux constitué d'au moins deux os ou fragments osseux ou bien d'un segment de colonne vertébrale constitué d'au moins deux vertèbres. Ce dispositif comporte au moins deux éléments d'ancrage (10), dont chacun se fixe à une vertèbre de la colonne vertébrale, pour un élément de liaison qui comprend un organe de tension (15), sous forme de barre, de fil métallique ou de câble et fixé à l'élément de liaison (10), ainsi que des manchons d'écartement (16) coulissant sur l'organe de tension (15) afin de maintenir les éléments d'ancrage voisins (10) à une distance prédéfinie lorsqu'une traction s'exerce sur lui. Les surfaces de l'élément d'ancrage sur lesquelles les manchons d'écartement s'appuient présentent une courbure convexe ou concave sphérique.
EP98939650A 1997-07-31 1998-07-31 Dispositif pour le raidissement ou la correction de la colonne vertebrale ou autre Withdrawn EP0999795A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19733160 1997-07-31
DE19733160 1997-07-31
DE19738968 1997-09-05
DE19738968A DE19738968B4 (de) 1997-07-31 1997-09-05 Vorrichtung zur Versteifung und/oder Korrektur einer Wirbelsäule od. dgl.
PCT/EP1998/004812 WO1999005980A1 (fr) 1997-07-31 1998-07-31 Dispositif pour le raidissement ou la correction de la colonne vertebrale ou autre

Publications (1)

Publication Number Publication Date
EP0999795A1 true EP0999795A1 (fr) 2000-05-17

Family

ID=26038756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98939650A Withdrawn EP0999795A1 (fr) 1997-07-31 1998-07-31 Dispositif pour le raidissement ou la correction de la colonne vertebrale ou autre

Country Status (4)

Country Link
US (1) US6290700B1 (fr)
EP (1) EP0999795A1 (fr)
JP (1) JP2001511388A (fr)
WO (1) WO1999005980A1 (fr)

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