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WO1995008298A1 - Prothese de liaison intervertebrale et element de pontage associe - Google Patents

Prothese de liaison intervertebrale et element de pontage associe Download PDF

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Publication number
WO1995008298A1
WO1995008298A1 PCT/BE1994/000058 BE9400058W WO9508298A1 WO 1995008298 A1 WO1995008298 A1 WO 1995008298A1 BE 9400058 W BE9400058 W BE 9400058W WO 9508298 A1 WO9508298 A1 WO 9508298A1
Authority
WO
WIPO (PCT)
Prior art keywords
opening
securing
screw
washer
elements
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.)
Ceased
Application number
PCT/BE1994/000058
Other languages
English (en)
Inventor
Louis François Charles BECKERS
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1995008298A1 publication Critical patent/WO1995008298A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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 or setting implements
    • 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, e.g. 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
    • 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 or setting implements
    • 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, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7044—Screws or hooks combined with longitudinal elements which do not contact vertebrae also having plates, staples or washers bearing on the vertebrae

Definitions

  • This invention concerns a device for joining vertebrae together, as well as a bridge used for this purpose. Such devices are also referred to as pedicle bridges.
  • the invention concerns a device of the type that consists of, firstly, a joining element, such as a frame, and secondly, at least one securing element with an end part, having an opening therethrough for a screw or suchlike, and thirdly, attachment means for attaching said at least one securing element to the joining element.
  • the present invention therefore concerns a device for joining vertebrae, by means of which the above-mentioned disadvantages are avoided.
  • bridges will be used, having two securing elements connected by a bridging element
  • the present invention is not limited to such embodiment.
  • the invention is also advantageous in devices not having such bridging element it also relates to devices having separate securing elements or having securing elements connected to each other by other means than a bridging element.
  • the invention concerns a device for joining vertebrae, comprising firstly a joining element; secondly at least one securing element with an end part having an opening therethrough for a screw or other fastening member; and thirdly attachment means for attaching said at least one securing element to the joining element, characterised in that the opening in the end part is slot-shaped, and in that the securing element is provided with means which lend lateral stability to the screw or other fastening member which is fitted through the opening in the end part.
  • the above-mentioned means consist of a washer placed directly underneath the head of said screw, having an opening sufficiently small for the screw to fit into it, together with locking means for opposing any relative displacement between said washer and the underlying surface, or better still preventing it altogether.
  • fig. 1 is a schematic representation of the problem that can occur in spinal surgery;
  • fig. 2 shows a device according to the invention;
  • fig. 3 is a cross-section along line III-III in fig.
  • fig. 4 is a view in the direction of arrow F4 in fig.
  • fig. 5 shows only the part indicated by arrow F5 in fig. 3; fig. 6 is a view in the direction of arrow F6 in fig.
  • fig. 7 shows only the part indicated by arrow F7 in fig. 3; fig. 8 is a view in the direction of arrow F8 in fig.
  • fig. 9 shows only the part indicated by arrow F9 in fig. 3, more particularly the underneath of same; fig. 10 is a cross-section along line X-X in fig. 9; fig. 11 is a view in the direction of arrow Fll in fig. 10; fig. 12 is a cross-section, to a greatly enlarged scale, of the meshing between parts shown in figs. 8 and 9 respectively; fig. 13 shows a variant of the part shown in fig. 9; fig. 14 shows the use of the element in fig. 13; fig. 15 shows the fitting of a screw in a device according to the invention; fig. 16 shows another embodiment of the invention.
  • Fig. 1 is a schematic representation of a device l for joining vertebrae 2, consisting of firstly a joining element 3, and secondly three bridges each having two securing elements 4 which are screwed tight to the vertebrae 2. It is clear that attachment of the bridges can easily give rise to a problem of positioning.
  • a device 1 which as shown in figs. 2, 3 and 4 consists of firstly, a joining element 3; secondly two securing elements 4 connected by a bridging element 7 said elements 4 having end parts 8, preferably coplanar and each with an opening 9 for a screw 10 or suchlike; and thirdly attachment means 11 for attaching the securing elements 4 to the joining element 3, where the openings 9 in the end parts 8 are slot shaped, and where the securing elements 4 are provided with means 12 which lend lateral stability to the screws 10 fitted through the openings 9 in the coplanar parts 8.
  • the joining element 3 can, as in the known technology, consist of a frame formed by a ring-shaped, curved profile with a circular cross-section.
  • the ring-shaped frame may be rectangular.
  • Each bridging element 7 consists of a bracket 13, such that when said bracket 13 is placed against the underneath of the above-mentioned frame, said frame sits precisely against the sides of the bracket 13.
  • the above-mentioned means of attachment 11 are preferably formed by clamping means, and better still by clamping means which tighten when the above-mentioned screws 10 are screwed tight, so that the securing means 4 are held tight.
  • said clamping means consist of clip elements 14 which function as clamping plates, each consisting of a flat part 15 with an opening 16, a curved counter-pressing part 17 which operates on the joining element 3, and a lip-shaped end 18 which hooks into an opening 19 in the bridging element 7.
  • FIGs. 5 to 8 show views of two securing means 4 connected by the bridging element 7 and a clip element 14, in order to make clear the structure of these elements.
  • the securing means 4 and the bridging element 7 preferably form one part.
  • the means 12, which lend lateral stability to the screws 10 fitted through the openings 9 in the coplanar parts 8, preferably consist of a washer 20, applied at each of said securing means 4, said washer having an opening 21 right through it, said opening being evenly shaped, in other words not long and narrow, but preferably round or essentially round with a diameter that enables a screw 10 to fit through it.
  • Said washer is shown in detail in figs. 9 to 11.
  • openings 16 in the clip elements 14 are also slot shaped.
  • locking means can be supplied which ensure that, when tightened, it is very difficult or impossible for the washers 20 to be displaced relative to the underlying surface.
  • Said locking means can be formed by serrations 25 and 26 respectively in the underneath of the washer 20 and in the surface underneath, as shown in fig. 12, such that great lateral stability is achieved even when the tightening force is very slight, or in other words relative displacement between the washers and the constructive portions underneath the washers 20 is avoided.
  • the locking means can also consist of a roughening of the material of at least one of the surfaces which fit together, e.g. by coarse shot blasting.
  • the locking means will at least provide stability in the longitudinal direction of the slot-shaped openings 9.
  • the washers 20 preferably have turned-down edges 27 and 28 which fit precisely over the parts underneath, namely the clip elements 14 and the end parts 8, so preventing any rotation of the washers 20 when the screws 10 are tightened. It is clear that, as shown in fig. 3, the height H of the edges 27 and 28 is preferably smaller than or equal to the distance G formed by the sum of the thicknesses of the end part 8 and the part 15.
  • edges 27 and 28 are also in particular important in that they serve to strengthen and hold in the sides of at least the slotted part which is located directly under the washer 20. With such side edges 27 and 28, it is possible to utilise a relatively long slot with a reduced risk of outward distortion or bowing of the sides of the slot. The reinforcing effect of these edges 27 and 28 also permits the slotted parts to be quite narrow in width, thereby increasing the compactness of these parts.
  • the washers 20 are preferably made such that the openings 9 and 16, whose shapes correspond, are completely closed, such that forces can also be transmitted via the washers 20.
  • the openings 21 right through the washers 20 are eccentric, as shown in fig. 13. This has the advantage that, as shown in fig. 14, the openings 9 are always closed, even when the axis 29 of the screw 10 is close to one or other of the ends of the slot shaped opening 9, and moreover the washers 20 do not reach farther laterally than the underlying parts. It is then only necessary to place the corresponding washer 20 in the correct direction.
  • Screws 10 with spherical heads 22 are preferably used in the device.
  • screws with hollow heads are preferably used, as shown in fig. 15.
  • the screws 10 on the one hand and the washers 20 on the other should be made such that the screws 10 can be pushed freely through the openings in the corresponding washers 20, the ratio between the size of the opening in each washer 20 on the one hand, and the dimensions of the core and the thread of the screw on the other hand, are chosen such that said screw 10 can indeed be screwed through the opening in the corresponding washer 20, but cannot be pushed through it, which offers the advantage that, as shown in fig. 15, the corresponding washer 20 can rest on the top of the screw thread 31, which is easier when fitting the device.
  • the walls of the opening 21 are preferably narrowed, for example chamfered by means of the chamfering 32 shown in figs. 10, 11 and 14, which also results in the contact surface between the head of the screw 10 and washer 20 being increased, if a screw with a rounded head is chosen.
  • the distance between the locations A to F are not very critical, and that according to the invention a single bridge is suitable for bridging different distances, without losing the lateral stability of the screws 10.
  • 'screws 10 with a hollow or solid core can be used. If a screw with hollow core is used, it can be fitted over a pin 33, as shown in fig. 15, where the diameter of the pin 33 enables the hollow screw 10 to be slid over said pin 33.
  • the pins 33 or suchlike are first pressed into the openings in the vertebrae 2 into which the screws are to be inserted.
  • the above-mentioned means 12 can also consist of a series of different clip elements 14 with round openings at different distances, without a washer 20 being required.
  • This embodiment is slightly less advantageous, but still offers the advantage that one bridge can be used for different sizes, while a suitably sized clip element 14 must be provided.
  • each securing element 4 is replaced by separate securing elements 4, wherein each separate securing element has one end part 8 with opening 9 and is associated with a respective one of the curved counter-pressing parts 17.
  • each securing element can be attached independently to a respective side of the joining element 3.
  • a combination of bridged elements 4 and separate elements 4, attached to the same joining element 3 is possible.
  • each securing element 4 can be connected with its respective clip element 14 by means other than the lip-shaped end 18 and opening 19.
  • the attachment means 11 may be such that they do not co-operate with the aforesaid means 12.
  • the attachment between the securing element 4 and the joining element 3 can also be realized by means of separate screws or other separate attachment elements.
  • the washer 20 can be supported directly by the corresponding lip-shaped end 18, which in that case may be provided with the serrations 26 or other locking means.

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

Prothèse de liaison intervertébrale comportant a) un élément de pontage (3) ; b) au moins un élément de fixation (4) dont l'une des extrémités (8) présente une ouverture traversante (9) destinée à recevoir une vis (10) ou tout autre élément de fixation; et c) un moyen de liaison (11) reliant le ou les éléments de fixation (4) à l'élément de liaison (3). Ladite prothèse se caractérise en ce que l'ouverture (9) pratiquée dans l'extrémité (8) présente une forme oblongue et que l'élément de fixation (4) comporte un moyen (12) de stabilisation latérale de la vis (10) ou d'autres éléments de fixation passant par l'ouverture (9) pratiquée dans l'extrémité (8).
PCT/BE1994/000058 1993-09-21 1994-09-20 Prothese de liaison intervertebrale et element de pontage associe Ceased WO1995008298A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9300983 1993-09-21
BE9300983A BE1007550A3 (nl) 1993-09-21 1993-09-21 Inrichting voor het verbinden van ruggewervels en brug hierbij aangewend.

Publications (1)

Publication Number Publication Date
WO1995008298A1 true WO1995008298A1 (fr) 1995-03-30

Family

ID=3887350

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BE1994/000058 Ceased WO1995008298A1 (fr) 1993-09-21 1994-09-20 Prothese de liaison intervertebrale et element de pontage associe

Country Status (2)

Country Link
BE (1) BE1007550A3 (fr)
WO (1) WO1995008298A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0809974A3 (fr) * 1996-05-31 1998-04-15 Acromed Corporation Appareil pour retenir des parties osseuses dans un position souhaitée l'une par rapport à l'autre
FR2851911A1 (fr) * 2003-03-06 2004-09-10 Eurosurgical Dispositif de fixation thoracique
EP1613224A4 (fr) * 2003-04-04 2008-07-09 Stephen Ritland Dispositif de fixation dynamique et son procede d'utilisation
US7628799B2 (en) 2005-08-23 2009-12-08 Aesculap Ag & Co. Kg Rod to rod connector
WO2011119751A1 (fr) * 2010-03-23 2011-09-29 Scapa Flow, Llc Système de connecteurs cervicaux
US8690922B2 (en) 2002-05-08 2014-04-08 Stephen Ritland Dynamic fixation device and method of use
US8845694B2 (en) 2005-07-19 2014-09-30 Warsaw Orthopedic, Inc. Rod extension for extending fusion construct
WO2017147162A1 (fr) * 2016-02-22 2017-08-31 Nuvasive, Inc. Construction vertébrale à double tige intégrée
US11103283B2 (en) 2016-02-22 2021-08-31 Nuvasive, Inc. Integral double rod spinal construct

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990004948A1 (fr) * 1988-11-04 1990-05-17 Surgicraft Limited Instrument de support du pedicule
EP0425783A1 (fr) * 1989-10-30 1991-05-08 Synthes AG, Chur Pince pour une vis pédiculaire
FR2656214A1 (fr) * 1989-12-26 1991-06-28 Baulny Dominique Cadre dynamique d'osteosynthese du rachis.
US5092893A (en) * 1990-09-04 1992-03-03 Smith Thomas E Human orthopedic vertebra implant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990004948A1 (fr) * 1988-11-04 1990-05-17 Surgicraft Limited Instrument de support du pedicule
EP0425783A1 (fr) * 1989-10-30 1991-05-08 Synthes AG, Chur Pince pour une vis pédiculaire
FR2656214A1 (fr) * 1989-12-26 1991-06-28 Baulny Dominique Cadre dynamique d'osteosynthese du rachis.
US5092893A (en) * 1990-09-04 1992-03-03 Smith Thomas E Human orthopedic vertebra implant

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0809974A3 (fr) * 1996-05-31 1998-04-15 Acromed Corporation Appareil pour retenir des parties osseuses dans un position souhaitée l'une par rapport à l'autre
US9622790B2 (en) 2001-09-19 2017-04-18 Warsaw Orthopedic, Inc. Rod extension for extending fusion construct
US8932334B2 (en) 2002-04-05 2015-01-13 Stephen Ritland Dynamic fixation device and method of use
US9918744B2 (en) 2002-05-08 2018-03-20 Stephen Ritland Dynamic fixation device and method of use
US8690922B2 (en) 2002-05-08 2014-04-08 Stephen Ritland Dynamic fixation device and method of use
US9232967B2 (en) 2002-05-08 2016-01-12 Stephen Ritland Dynamic fixation device and method of use
FR2851911A1 (fr) * 2003-03-06 2004-09-10 Eurosurgical Dispositif de fixation thoracique
EP1613224A4 (fr) * 2003-04-04 2008-07-09 Stephen Ritland Dispositif de fixation dynamique et son procede d'utilisation
US8845694B2 (en) 2005-07-19 2014-09-30 Warsaw Orthopedic, Inc. Rod extension for extending fusion construct
US7628799B2 (en) 2005-08-23 2009-12-08 Aesculap Ag & Co. Kg Rod to rod connector
WO2011119751A1 (fr) * 2010-03-23 2011-09-29 Scapa Flow, Llc Système de connecteurs cervicaux
US10219842B2 (en) 2010-03-23 2019-03-05 Scapa Flow, Llc Cervical link system
US11123111B2 (en) 2010-03-23 2021-09-21 Scapa Flow, Llc Cervical link system
WO2017147162A1 (fr) * 2016-02-22 2017-08-31 Nuvasive, Inc. Construction vertébrale à double tige intégrée
US11103283B2 (en) 2016-02-22 2021-08-31 Nuvasive, Inc. Integral double rod spinal construct
US12042183B2 (en) 2016-02-22 2024-07-23 Nuvasive, Inc. Integral double rod spinal construct

Also Published As

Publication number Publication date
BE1007550A3 (nl) 1995-08-01

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