EP1631208A2 - Self-compressing screw for joining two bone segments - Google Patents

Self-compressing screw for joining two bone segments

Info

Publication number
EP1631208A2
EP1631208A2 EP04742753A EP04742753A EP1631208A2 EP 1631208 A2 EP1631208 A2 EP 1631208A2 EP 04742753 A EP04742753 A EP 04742753A EP 04742753 A EP04742753 A EP 04742753A EP 1631208 A2 EP1631208 A2 EP 1631208A2
Authority
EP
European Patent Office
Prior art keywords
thread
screw
self
bone
revolution
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Withdrawn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
EP04742753A
Other languages
German (de)
French (fr)
Inventor
Xavier Renard
Michel Merle
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 EP1631208A2 publication Critical patent/EP1631208A2/en
Withdrawn legal-status Critical Current

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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
    • A61B17/8645—Headless screws, e.g. ligament interference screws
    • 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
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue
    • A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper

Definitions

  • the present invention relates to self-compressive screws, and advantageously self-tapping screws, for joining two portions of bone with a view to carrying out an osteosynthesis between these two portions of bone.
  • the screw rod is screwed into a first of the two portions of bone, until it crosses it, then partially penetrates the second portion of bone, and a nut or the like is screwed on the end of the part of the rod which emerges of the first portion of bone.
  • the main drawback lies in the fact that, in the case of small bones, it is very difficult if not impossible to retract the part of the screw which emerges with the nut, with the risk of injuring the flesh surrounding the bone portions to reunite.
  • the present invention therefore aims to achieve a self-tapping and self-compressive screw to join two portions of bone in order to obtain osteosynthesis between these two portions of bone, which largely overcomes the drawback mentioned above.
  • bone screws of the prior art having a relatively simple structure minimizing the number of constituent elements compared to the screws of the prior art, while allowing very good self compression to be obtained.
  • the present invention relates to a self-compressive screw for joining two portions of bone in order to achieve osteosynthesis between these two portions of bone, comprising a screw rod defined on an axis of revolution, and two first and second threads made on said screw rod, these two first and second threads being centered on said axis of revolution, characterized in that the first casing in the form of a hollow cylindrical of revolution defined by the first thread between the bottom and the the top of its thread is entirely included in the second envelope in the form of a hollow cylindrical revolution defined by the second thread between the bottom and the top of its thread, and that the pitch of the first thread is smaller than the pitch of the second thread.
  • the three figures 1 to 3 are representations in longitudinal half-section according to a conventional representation well known in industrial drawing, of a part of revolution or substantially of revolution,
  • FIG. 1 representing the block diagram of a self-compressive screw according to the invention
  • FIG. 2 representing a diagram making it possible to understand the operation of the self-compressive screw according to the invention
  • FIG. 3 showing, in schematic form, a preferred embodiment of the self-compressive screw according to the invention.
  • the screw according to the invention relates to a self-compressive screw for joining two portions of bone O s for the purpose of osteosynthesis between these two portions of bone.
  • This screw comprises a screw rod 1 defined on an axis of revolution 2 and two first and second threads 11, 22 produced on the screw rod 1, these two first and second threads being centered on the axis of revolution 2.
  • the first casing 15 in the form of a hollow cylindrical of revolution centered on the axis 2 and defined by the first thread 11 between the bottom 12 and the top 13 of its thread 14 is entirely included in the second casing 25 in the form, too, of a hollow cylindrical revolution centered on the axis 2 and defined by the second thread 22 between the bottom 23 and the top 24 of its thread 25.
  • the pitch Pu of the first thread 11 is smaller than the pitch P 22 of the second thread 22. It is specified that the two threads 11, 22 produced on the rod 1 can be consecutive without space separating them, but that they can also be followed by being separated for example by a smooth part of the rod.
  • the internal diameter of the first envelope 15 is substantially equal to the interior diameter of the second envelope 25.
  • the difference between the outside diameter and the inside diameter of the first envelope 15 is substantially equal to half the difference between the outside diameter and the internal diameter of the second casing 25, and the pitch Pu of the first thread 11 is substantially equal to half of the pitch P 22 of the second thread 22.
  • the end 16 of the first thread 11 opposite that 17 which faces the second thread 22 it is shaped at the gripping end 18 by a screwing tool.
  • This end 16 may comprise, as illustrated, a slot, a polygonal housing, etc., with which a tool such as a screwdriver or the like can cooperate without it having been necessary to produce a shoulder head as for conventional screws.
  • a screwdriver is a well-known ancillary in the field of bone repair surgery.
  • the screw rod 1 and the two first and second threads 11, 22 are made in one piece from a biocompatible material such as titanium or a titanium alloy.
  • FIG. 2 represents the thread 30 obtained in the first portion of os O s after passing the second thread 22.
  • the second thread 22 of the screw penetrates into the second portion of bone and, by self-tapping, is also screwed there.
  • the first thread 11 is screwed into the thread 30 produced with the second thread in the first portion of bone, as illustrated in FIG. 2.
  • the first thread 11 has a pitch smaller than that of the second thread 22
  • the movement of recoil of the second portion of bone being of greater amplitude than that of the first portion of bone since, structurally, the step P 2 2 is greater than the step Pu.
  • the difference in relative recoil of the two bone portions is in fact proportional to the difference in the values of the two steps Pu and P 22 .
  • the screwing of the screw is carried out by the gripping head 18, as mentioned previously.
  • the screw according to the invention has other advantages than those mentioned above. In particular, it does not require the screwing of a nut on the end of the screw rod emerging from the first portion of bone. After the screw has been screwed into the two bone portions and the compression force has been carried out by the practitioner, this emerging part of the screw rod 1 can be cut flush with the first portion of bone, without a portion dangerously protruding into the surrounding flesh.
  • the screw according to the invention may advantageously include screwing-unscrewing means so that it can easily undergo a screwing extra after its emerging end has been cut or unscrewed after being implanted.
  • These screw-unscrewing means to obtain the above-mentioned goals can be constituted by at least one longitudinal flat parallel to the axis of the screw rod produced on the first thread 11, this flat being able to serve as a grip for a clamp. or the like to drive the screw in rotation in one direction or the other as required.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (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)

Abstract

The invention relates to self-compressing screws and advantageously self-threading screws. The inventive screw is characterised essentially in that it comprises a screw shaft (1) having an axis of revolution (2), said screw shaft (1) being provided with two threads (11, 22) that are centred on the axis of revolution, and in that the first envelope (15) in the form of a rotary hollow cylinder defined by the thread (11), between the base (12) and the tip (13) of an individual thread section (14), entirely fits inside the second envelope (25) in the form of a rotary hollow cylinder defined by the thread (22), between the base (23) and the tip (24) of an individual thread section (25), the pitch P11 of the thread (11) being smaller than the pitch P22 of the thread (22). The invention also relates to the application of said screw for joining two bone segments in order to perform an osteosynthesis operation between said two bone segments.

Description

VIS AUTO COMPRESSIVE POUR REUNIR DEUX PORTIONS DOS AUTO COMPRESSIVE SCREW FOR JOINING TWO BACK PORTIONS
La présente invention concerne les vis auto compressives, et avantageusement auto taraudantes, pour réunir deux portions d'os en vue de la réalisation d'une ostéosynthèse entre ces deux portions d'os.The present invention relates to self-compressive screws, and advantageously self-tapping screws, for joining two portions of bone with a view to carrying out an osteosynthesis between these two portions of bone.
Il existe des dispositifs permettant de réaliser une ostéosynthèse entre deux portions d'os, par exemple après une fracture de cet os ou pour éliminer le siège d'une douleur au niveau de l'articulation entre deux os, etc.There are devices for performing osteosynthesis between two portions of bone, for example after a fracture of this bone or for eliminating the site of pain at the joint between two bones, etc.
Parmi les nombreux dispositifs qui sont utilisés pour obtenir un tel résultat, il existe tout simplement des vis osseuses. La tige de vis est vissée dans une première des deux portions d'os, jusqu'à la traverser, puis pénètre partiellement la seconde portion d'os, et un écrou ou analogue est vissé sur l'extrémité de la partie de tige qui émerge de la première portion d'os.Among the many devices which are used to obtain such a result, there are quite simply bone screws. The screw rod is screwed into a first of the two portions of bone, until it crosses it, then partially penetrates the second portion of bone, and a nut or the like is screwed on the end of the part of the rod which emerges of the first portion of bone.
Cette technique donne dans l'ensemble de bons résultats mais présente quelques inconvénients, notamment dans le cas de la réunion de petits os comme ceux de la main ou d'autres os du même type.This technique gives overall good results but has some drawbacks, especially in the case of the union of small bones such as those of the hand or other bones of the same type.
Le principal inconvénient réside dans le fait que, dans le cas des petits os, il est très difficile sinon impossible d'escamoter la partie de vis qui émerge avec l'écrou, avec le risque de blesser les chairs entourant les portions d'os à réunir.The main drawback lies in the fact that, in the case of small bones, it is very difficult if not impossible to retract the part of the screw which emerges with the nut, with the risk of injuring the flesh surrounding the bone portions to reunite.
Il existe aussi un système auto compressif à vis comme celui qui est décrit dans le US-6 030 162. Cependant, pour obtenir une auto compression avec ce système, il est nécessaire que les filetages de la vis soient coniques, et qu'elle comporte en outre trois filetages comme dans les réalisations illustrées sur les figures 1, 3, 8, 9, 17 à 22 de ce document, ou deux filetages mais avec en plus un écrou référencé 140 selon les réalisations illustrées sur les figures 11 à 16 de ce même document.There is also a self-compressing screw system like that described in US-6,030,162. However, to obtain self-compression with this system, it is necessary that the threads of the screw are conical, and that it comprises further three threads as in the embodiments illustrated in Figures 1, 3, 8, 9, 17 to 22 of this document, or two threads but with in addition a nut referenced 140 according to the embodiments illustrated in Figures 11 to 16 of this same document.
La présente invention a donc pour but de réaliser une vis auto taraudante et auto compressive pour réunir deux portions d'os en vue d'obtenir une ostéosynthèse entre ces deux portions d'os, qui pallie en grande partie l'inconvénient mentionné ci-dessus des vis osseuses de l'art antérieur, ayant une structure relativement simple minimisant le nombre des éléments constitutifs par rapport aux vis de l'art antérieur, tout en permettant d'obtenir une très bonne auto compression.The present invention therefore aims to achieve a self-tapping and self-compressive screw to join two portions of bone in order to obtain osteosynthesis between these two portions of bone, which largely overcomes the drawback mentioned above. bone screws of the prior art, having a relatively simple structure minimizing the number of constituent elements compared to the screws of the prior art, while allowing very good self compression to be obtained.
Plus précisément, la présente invention a pour objet une vis auto compressive pour réunir deux portions d'os en vue de réaliser une ostéosynthèse entre ces deux portions d'os, comprenant une tige de vis définie sur un axe de révolution, et deux premier et second filetages réalisés sur ladite tige de vis, ces deux premier et second filetages étant centrés sur ledit axe de révolution, caractérisée par le fait que la première enveloppe en forme de cylindrique creux de révolution définie par le premier filetage entre le fond et le sommet de son filet est entièrement comprise dans la seconde enveloppe en forme de cylindrique creux de révolution définie par le second filetage entre le fond et le sommet de son filet, et que le pas du premier filetage est plus petit que le pas du second filetage.More specifically, the present invention relates to a self-compressive screw for joining two portions of bone in order to achieve osteosynthesis between these two portions of bone, comprising a screw rod defined on an axis of revolution, and two first and second threads made on said screw rod, these two first and second threads being centered on said axis of revolution, characterized in that the first casing in the form of a hollow cylindrical of revolution defined by the first thread between the bottom and the the top of its thread is entirely included in the second envelope in the form of a hollow cylindrical revolution defined by the second thread between the bottom and the top of its thread, and that the pitch of the first thread is smaller than the pitch of the second thread.
D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description suivante donnée en regard des dessins annexés à titre illustratif mais nullement limitatif, dans lesquels :Other characteristics and advantages of the invention will appear during the following description given with reference to the drawings annexed by way of illustration but in no way limitative, in which:
Les trois figures 1 à 3 sont des représentations en demi coupe longitudinale selon une représentation conventionnelle bien connue en dessin industriel, d'une pièce de révolution ou sensiblement de révolution,The three figures 1 to 3 are representations in longitudinal half-section according to a conventional representation well known in industrial drawing, of a part of revolution or substantially of revolution,
La figure 1 représentant le schéma de principe d'une vis auto compressive selon l'invention,FIG. 1 representing the block diagram of a self-compressive screw according to the invention,
La figure 2 représentant un schéma permettant de comprendre le fonctionnement de la vis auto compressive selon l'invention, etFIG. 2 representing a diagram making it possible to understand the operation of the self-compressive screw according to the invention, and
La figure 3 représentant, sous forme schématique, un mode de réalisation préférentiel de la vis auto compressive selon l'invention.Figure 3 showing, in schematic form, a preferred embodiment of the self-compressive screw according to the invention.
Par référence aux figures annexées, la vis selon l'invention concerne une vis auto compressive pour réunir deux portions d'os Os en vue de la réalisation d'une ostéosynthèse entre ces deux portions d'os.With reference to the appended figures, the screw according to the invention relates to a self-compressive screw for joining two portions of bone O s for the purpose of osteosynthesis between these two portions of bone.
Cette vis comprend une tige de vis 1 définie sur un axe de révolution 2 et deux premier et second filetages 11 , 22 réalisés sur la tige de vis 1 , ces deux premier et second filetages étant centrés sur l'axe de révolution 2.This screw comprises a screw rod 1 defined on an axis of revolution 2 and two first and second threads 11, 22 produced on the screw rod 1, these two first and second threads being centered on the axis of revolution 2.
Selon une caractéristique de l'invention, la première enveloppe 15 en forme de cylindrique creux de révolution centré sur l'axe 2 et définie par le premier filetage 11 entre le fond 12 et le sommet 13 de son filet 14 est entièrement comprise dans la seconde enveloppe 25 en forme, elle aussi, de cylindrique creux de révolution centré sur l'axe 2 et définie par le second filetage 22 entre le fond 23 et le sommet 24 de son filet 25.According to a characteristic of the invention, the first casing 15 in the form of a hollow cylindrical of revolution centered on the axis 2 and defined by the first thread 11 between the bottom 12 and the top 13 of its thread 14 is entirely included in the second casing 25 in the form, too, of a hollow cylindrical revolution centered on the axis 2 and defined by the second thread 22 between the bottom 23 and the top 24 of its thread 25.
En outre, le pas Pu du premier filetage 11 est plus petit que le pas P22 du second filetage 22. Il est précisé que les deux filetages 11 , 22 réalisés sur la tige 1 peuvent être consécutifs sans espace les séparant, mais qu'ils peuvent aussi se suivre en étant séparés par exemple par une partie lisse de la tige.In addition, the pitch Pu of the first thread 11 is smaller than the pitch P 22 of the second thread 22. It is specified that the two threads 11, 22 produced on the rod 1 can be consecutive without space separating them, but that they can also be followed by being separated for example by a smooth part of the rod.
Dans une réalisation industrielle avantageuse, comme celle qui est illustrée sur la figure 3, le diamètre intérieur de la première enveloppe 15 est sensiblement égal au diamètre intérieur de la seconde enveloppe 25.In an advantageous industrial embodiment, such as that illustrated in FIG. 3, the internal diameter of the first envelope 15 is substantially equal to the interior diameter of the second envelope 25.
Selon une réalisation qui a donné de très bons résultats pour une ostéosynthèse sur des os de la main, la différence entre le diamètre extérieur et le diamètre intérieur de la première enveloppe 15 est sensiblement égal à la moitié de la différence entre le diamètre extérieur et le diamètre intérieur de la seconde enveloppe 25, et le pas Pu du premier filetage 11 est sensiblement égal à la moitié du pas P22 du second filetage 22.According to an embodiment which has given very good results for an osteosynthesis on bones of the hand, the difference between the outside diameter and the inside diameter of the first envelope 15 is substantially equal to half the difference between the outside diameter and the internal diameter of the second casing 25, and the pitch Pu of the first thread 11 is substantially equal to half of the pitch P 22 of the second thread 22.
Ces vis étant utilisées dans, le domaine osseux comme mentionné auparavant, il est avantageux, pour éviter de réaliser des avant-trous pour leur mise en place, que l'extrémité 26 du second filetage 22 opposée à celle 27 qui est tournée vers le premier filetage 11 soit conformée en extrémité pénétrante auto taraudante 28.These screws being used in the bone area as mentioned before, it is advantageous, to avoid making pilot holes for their installation, that the end 26 of the second thread 22 opposite to that 27 which is turned towards the first thread 11 is shaped as a self-tapping penetrating end 28.
Quant à l'extrémité 16 du premier filetage 11 opposée à celle 17 qui est tournée vers le second filetage 22, elle est conformée en extrémité de préhension 18 par un outil de vissage. Cette extrémité 16 peut comporter, comme illustré, une fente, un logement polygonal, etc., avec lesquels peut coopérer un outil comme un tournevis ou analogue sans qu'il ait été nécessaire de réaliser une tête d'epaulement comme pour les vis classiques. Un tel tournevis est un ancillaire bien connu dans le domaine de la chirurgie réparatrice osseuse.As for the end 16 of the first thread 11 opposite that 17 which faces the second thread 22, it is shaped at the gripping end 18 by a screwing tool. This end 16 may comprise, as illustrated, a slot, a polygonal housing, etc., with which a tool such as a screwdriver or the like can cooperate without it having been necessary to produce a shoulder head as for conventional screws. Such a screwdriver is a well-known ancillary in the field of bone repair surgery.
De façon préférentielle, la tige de vis 1 et les deux premier et second filetages 11, 22 sont réalisés en une seule pièce en un matériau biocompatible comme du titane ou un alliage de titane.Preferably, the screw rod 1 and the two first and second threads 11, 22 are made in one piece from a biocompatible material such as titanium or a titanium alloy.
La vis auto compressive décrite ci-dessus fonctionne de la façon suivante, par référence plus particulièrement à la figure 2 :The self-compressive screw described above operates as follows, with particular reference to Figure 2:
Tout d'abord, les deux portions d'os entre lesquelles doit être réalisée l'ostéosynthèse sont maintenues l'une contre l'autre par tous moyens provisoires, bien connus dans le domaine de la chirurgie osseuse réparatrice.First of all, the two portions of bone between which the osteosynthesis must be carried out are held one against the other by any temporary means, well known in the field of bone repair surgery.
Ensuite, la vis selon l'invention est vissée en traversant tout d'abord la première portion d'os, par taraudage grâce à l'extrémité 28 du second filetage 22. La figure 2 représente le filet 30 obtenu dans la première portion d'os Os après le passage du second filetage 22. Après avoir traversé la première portion d'os Os, le second filetage 22 de la vis pénètre dans la seconde portion d'os et, par auto taraudage, s'y visse aussi. Simultanément, du fait de ses caractéristiques structurelles définies auparavant, le premier filetage 11 se visse dans le filet 30 réalisé avec le second filetage dans la première portion d'os, comme illustré sur la figure 2.Then, the screw according to the invention is screwed by first passing through the first portion of bone, by tapping through the end 28 of the second thread 22. FIG. 2 represents the thread 30 obtained in the first portion of os O s after passing the second thread 22. After having crossed the first portion of bone O s , the second thread 22 of the screw penetrates into the second portion of bone and, by self-tapping, is also screwed there. Simultaneously, because of its structural characteristics defined previously, the first thread 11 is screwed into the thread 30 produced with the second thread in the first portion of bone, as illustrated in FIG. 2.
Cependant, comme le premier filetage 11 possède un pas inférieur à celui du second filetage 22, il se produit un mouvement relatif de recul des deux portions d'os par rapport à la vis auto compressive, le mouvement de recul de la seconde portion d'os étant de plus grande amplitude que celui de la première portion d'os puisque, structurellement, le pas P22 est plus grand que le pas Pu. La différence de recul relatif des deux portions d'os est en fait proportionnelle à la différence des valeurs des deux pas Pu et P22.However, as the first thread 11 has a pitch smaller than that of the second thread 22, there is a relative movement of recoil of the two portions of bone relative to the self-compressing screw, the movement of recoil of the second portion of bone being of greater amplitude than that of the first portion of bone since, structurally, the step P 2 2 is greater than the step Pu. The difference in relative recoil of the two bone portions is in fact proportional to the difference in the values of the two steps Pu and P 22 .
En conséquence, les deux portions d'os viennent au contact l'une de l'autre, si elles ne l'étaient déjà pas.As a result, the two portions of bone come into contact with each other, if they were not already.
En exerçant un effort supplémentaire de vissage sur la vis, il est même possible d'exercer une force de compression supplémentaire sur les deux portions d'os l'une contre l'autre, pour favoriser l'ostéosynthèse.By exerting an additional screwing effort on the screw, it is even possible to exert an additional compressive force on the two portions of bone against each other, to promote osteosynthesis.
Le vissage de la vis s'effectue par la tête de préhension 18, comme mentionné précédemment.The screwing of the screw is carried out by the gripping head 18, as mentioned previously.
La vis selon l'invention présente d'autres avantages que ceux mentionnés ci- dessus. Notamment, elle ne nécessite pas le vissage d'un écrou sur l'extrémité de la tige de vis émergeant de la première portion d'os. Après que la vis ait été vissée dans les deux portions d'os et que l'effort de compression ait été effectué par le Praticien, cette partie émergente de la tige de vis 1 peut être coupée au ras de la première portion d'os, sans qu'une partie ne dépasse dangereusement dans les chairs environnantes.The screw according to the invention has other advantages than those mentioned above. In particular, it does not require the screwing of a nut on the end of the screw rod emerging from the first portion of bone. After the screw has been screwed into the two bone portions and the compression force has been carried out by the practitioner, this emerging part of the screw rod 1 can be cut flush with the first portion of bone, without a portion dangerously protruding into the surrounding flesh.
Il faut aussi souligner que, après que la vis ait été coupée, le Praticien puisse lui faire subir un vissage supplémentaire pour faire totalement pénétrer dans la première portion d'os l'extrémité qui a subi la coupure, afin de parfaitement l'escamoter et être certain qu'aucune partie de vis ne dépasse dangereusement dans les chairs environnantes.It should also be emphasized that, after the screw has been cut, the Practitioner can make it undergo an additional screwing to make completely penetrate into the first portion of bone the end which has undergone the cut, in order to perfectly retract it and be certain that no part of the screw protrudes dangerously into the surrounding flesh.
En outre, lorsque l'ostéosynthèse est réalisée et obtenue, il possible que la vis ne soit plus nécessaire et que le Praticien procède à son retrait par dévissage.In addition, when the osteosynthesis is carried out and obtained, it is possible that the screw is no longer necessary and that the practitioner proceeds to its removal by unscrewing.
Pour ce faire, la vis selon l'invention peut avantageusement comporter des moyens de vissage-dévissage pour qu'elle puisse aisément subir un vissage supplémentaire après que son extrémité émergente ait été coupée ou être dévissée après avoir été implantée.To do this, the screw according to the invention may advantageously include screwing-unscrewing means so that it can easily undergo a screwing extra after its emerging end has been cut or unscrewed after being implanted.
Ces moyens de vissage-dévissage pour obtenir les buts mentionnés ci-dessus, peuvent être constitués par au moins un méplat longitudinal parallèle à l'axe de la tige de vis réalisé sur le premier filetage 11 , ce méplat pouvant servir de prise à une pince ou analogue pour entraîner la vis en rotation dans un sens ou dans l'autre selon les besoins. These screw-unscrewing means to obtain the above-mentioned goals, can be constituted by at least one longitudinal flat parallel to the axis of the screw rod produced on the first thread 11, this flat being able to serve as a grip for a clamp. or the like to drive the screw in rotation in one direction or the other as required.

Claims

R E V E N D I C A T I O N S
1. Vis auto-compressive pour réunir deux portions d'os (Os) en vue de la réalisation d'une ostéosynthèse entre ces deux portions d'os, comprenant une tige de vis (1) définie sur un axe de révolution (2), et deux premier et second filetages (11, 22) réalisés sur ladite tige de vis (1), ces deux premier et second filetages étant centrés sur ledit axe de révolution, caractérisée par le fait que la première enveloppe (15) en forme de cylindrique creux de révolution et définie par le premier filetage (11) entre le fond (12) et le sommet (13) de son filet (14) est entièrement comprise dans la seconde enveloppe (25) en forme de cylindrique creux de révolution et définie par le second filetage (22) entre le fond (23) et le sommet (24) de son filet (25), et que le pas (Pu) du premier filetage (11) est plus petit que le pas (P22) du second filetage (22).1. Self-compressive screw to join two bone portions (O s ) for the purpose of osteosynthesis between these two bone portions, comprising a screw rod (1) defined on an axis of revolution (2 ), and two first and second threads (11, 22) made on said screw rod (1), these two first and second threads being centered on said axis of revolution, characterized in that the first casing (15) in the form of cylindrical hollow of revolution and defined by the first thread (11) between the bottom (12) and the top (13) of its thread (14) is entirely included in the second envelope (25) in the shape of hollow cylindrical of revolution and defined by the second thread (22) between the bottom (23) and the top (24) of its thread (25), and that the pitch (Pu) of the first thread (11) is smaller than the pitch (P 22 ) of the second thread (22).
2. Vis selon la revendication 1 , caractérisée par le fait que le diamètre intérieur de la première enveloppe (15) est sensiblement égal au diamètre intérieur de la seconde enveloppe (25).2. Screw according to claim 1, characterized in that the internal diameter of the first envelope (15) is substantially equal to the internal diameter of the second envelope (25).
3. Vis selon la revendication 2, caractérisée par le fait que la différence entre le diamètre extérieur et le diamètre intérieur de la première enveloppe (15) est sensiblement égal à la moitié de la différence entre le diamètre extérieur et le diamètre intérieur de la seconde enveloppe (25).3. Screw according to claim 2, characterized in that the difference between the outside diameter and the inside diameter of the first casing (15) is substantially equal to half the difference between the outside diameter and the inside diameter of the second envelope (25).
4. Vis selon l'une des revendications 1 à 3, caractérisée par le fait que le pas (Pu) du premier filetage (11) est sensiblement égal à la moitié du pas (P22) du second filetage (22).4. Screw according to one of claims 1 to 3, characterized in that the pitch (Pu) of the first thread (11) is substantially equal to half the pitch (P 22 ) of the second thread (22).
5. Vis selon l'une des revendications 1 à 4, caractérisée par le fait que l'extrémité (26) du second filetage (22) opposée à celle (27) qui est tournée vers le premier filetage (11) est conformée en extrémité pénétrante auto-taraudante (28).5. Screw according to one of claims 1 to 4, characterized in that the end (26) of the second thread (22) opposite to that (27) which faces the first thread (11) is shaped at the end self-tapping penetrating (28).
6. Vis selon l'une des revendications 1 à 5, caractérisée par le fait que l'extrémité (16) du premier filetage (11) opposée à celle (17) qui est tournée vers le second filetage (22) est conformée en extrémité de préhension (18) par un outil de vissage. 6. Screw according to one of claims 1 to 5, characterized in that the end (16) of the first thread (11) opposite to that (17) which faces the second thread (22) is shaped at the end gripping (18) by a screwing tool.
7. Vis selon l'une des revendications 1 à 6, caractérisée par le fait que la tige de vis (1) et les deux premier et second filetages (11, 22) sont réalisés en une seule pièce en un matériau biocompatible.7. Screw according to one of claims 1 to 6, characterized in that the screw rod (1) and the two first and second threads (11, 22) are made in one piece from a biocompatible material.
8. Vis selon l'une des revendications 1 à 7, caractérisée par le fait que ledit matériau biocompatible est du titane ou un alliage de titane.8. Screw according to one of claims 1 to 7, characterized in that said biocompatible material is titanium or a titanium alloy.
9. Vis selon l'une des revendications 1 à 8, caractérisée par le fait qu'elle comporte en outre des moyens de vissage-dévissage.9. Screw according to one of claims 1 to 8, characterized in that it further comprises screwing-unscrewing means.
10. Vis selon la revendication 9, caractérisée par le fait que lesdits moyens de vissage-dévissage sont constitués par un méplat longitudinal parallèle à l'axe (2) de la tige de vis (1) réalisé sur le premier filetage (11). 10. Screw according to claim 9, characterized in that said screw-unscrewing means consist of a longitudinal flat parallel to the axis (2) of the screw rod (1) formed on the first thread (11).
EP04742753A 2003-05-30 2004-05-17 Self-compressing screw for joining two bone segments Withdrawn EP1631208A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0306559A FR2855391B1 (en) 2003-05-30 2003-05-30 COMPRESSIVE AUTO SCREW FOR JOINING TWO BONE PORTIONS
PCT/FR2004/001205 WO2004107999A2 (en) 2003-05-30 2004-05-17 Screw comprising two threads with different pitches, used to join two bone segments

Publications (1)

Publication Number Publication Date
EP1631208A2 true EP1631208A2 (en) 2006-03-08

Family

ID=33427561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04742753A Withdrawn EP1631208A2 (en) 2003-05-30 2004-05-17 Self-compressing screw for joining two bone segments

Country Status (5)

Country Link
US (1) US20080015595A1 (en)
EP (1) EP1631208A2 (en)
JP (1) JP2006525844A (en)
FR (1) FR2855391B1 (en)
WO (1) WO2004107999A2 (en)

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Also Published As

Publication number Publication date
FR2855391B1 (en) 2005-12-09
US20080015595A1 (en) 2008-01-17
WO2004107999A3 (en) 2005-02-24
WO2004107999A2 (en) 2004-12-16
JP2006525844A (en) 2006-11-16
FR2855391A1 (en) 2004-12-03

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