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FR3000664A3 - Screw for treatment of small bone in e.g. hand, has machining screed flush-mounted at sector of proximal turn of thread, and proximal and distal threaded portions arranged on coil for forming step edge in unscrewing direction of screw - Google Patents

Screw for treatment of small bone in e.g. hand, has machining screed flush-mounted at sector of proximal turn of thread, and proximal and distal threaded portions arranged on coil for forming step edge in unscrewing direction of screw Download PDF

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Publication number
FR3000664A3
FR3000664A3 FR1350067A FR1350067A FR3000664A3 FR 3000664 A3 FR3000664 A3 FR 3000664A3 FR 1350067 A FR1350067 A FR 1350067A FR 1350067 A FR1350067 A FR 1350067A FR 3000664 A3 FR3000664 A3 FR 3000664A3
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France
Prior art keywords
screw
proximal
threaded portion
distal
machining
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Granted
Application number
FR1350067A
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French (fr)
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FR3000664B3 (en
Inventor
Eric Toullec
Ali Ghorbani
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Stryker European Holdings I LLC
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Small Bone Innovations International SAS
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Priority to FR1350067A priority Critical patent/FR3000664B3/en
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Publication of FR3000664B3 publication Critical patent/FR3000664B3/en
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
    • A61B17/8615—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the central region of the screw head
    • 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
    • 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
    • A61B17/8635—Tips of 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
    • A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated

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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 screw (1) has a machining screed (15) flush-mounted at a sector of a proximal turn of a thread that includes proximal and distal threaded portions (3, 4), where the threaded portions are arranged on a coil for forming a step edge (17) in an unscrewing direction of the screw. The threaded portions are separated by a median portion and formed by a threaded cylindrical head of a body (2). The threaded portions are arranged at proximal and distal sides of the screw, respectively. Grooves are formed in a central portion of the body.

Description

006 6 4 1 La présente invention concerne une vis à os, particulièrement destinée à être implantée dans de l'os cortical au niveau proximal et dans de l'os spongieux au niveau distal. De nombreux traitements d'un os impliquent la mise en place d'une ou plusieurs 5 vis dans cet os ou dans des fragments de cet os. Il existe des vis à os aptes à être vissées dans un os sans perçage d'un pré-trou ; les figures 1 et 2 montrent en perspective, selon deux angles de vue différents, l'extrémité distale auto-foreuse d'une vis à os existante ; cette extrémité comprend trois dents 110 formées par des usinages 111 et délimitées par des faces radiales 10 112 de coupe et des faces inclinées 113 de dégagement. Ces vis sont généralement canulées, comme cela est le cas de celle dont l'extrémité distale est représentée sur les figures 1 et 2, de manière à pouvoir être guidées par leur engagement sur une broche préalablement mise en place. De telles vis à os doivent parfois être retirées après une durée d'implantation 15 plus ou moins longue. Les vis existantes présentent un problème de difficulté de retrait, résultant de la croissance des cellules osseuses autour de la vis. La présente invention a pour objectif principal de remédier à ce problème. Il existe par ailleurs des vis à os dites "à compression", destinées au traitement de fractures. Une telle vis présente une portion filetée proximale, généralement au 20 niveau d'une tête de vis conique ou cylindro-conique, et une portion filetée distale dont le filet a un pas supérieur à celui de la portion filetée proximale ; ce pas supérieur fait que la rotation de la vis conduit au rapprochement d'un fragment d'os distal, dans lequel est insérée la portion filetée distale, par rapport à un fragment d'os proximal, dans lequel est insérée la portion filetée proximale. 25 Les vis à compression existantes présentent cependant l'inconvénient important d'un maintien parfois imparfait de l'un ou l'autre des deux fragments lors du rapprochement de ces fragments, particulièrement lorsque l'os est de mauvaise qualité. Il en résulte un risque de rapprochement insuffisant d'un fragment par rapport à l'autre. 30 La présente invention a aussi pour objectif de remédier à cet inconvénient. Selon l'invention, la vis présente au moins un usinage d'arasement, arasant un secteur d'au moins la spire proximale du filet que comprend au moins une portion filetée de la vis, de manière à aménager sur cette spire un décrochement formant une arête sensiblement radiale, de début de spire dans le sens du dévissage de la 35 vis.The present invention relates to a bone screw, particularly intended to be implanted in cortical bone proximally and in spongy bone distally. Many bone treatments involve the placement of one or more screws into that bone or into fragments of that bone. There are bone screws that can be screwed into a bone without drilling a pre-hole; Figures 1 and 2 show in perspective, according to two different angles of view, the self-drilling distal end of an existing bone screw; this end comprises three teeth 110 formed by machining operations 111 and delimited by radial cutting faces 112 and inclined faces 113 of clearance. These screws are generally cannulated, as is the case of the one whose distal end is shown in Figures 1 and 2, so as to be guided by their engagement on a pin previously put in place. Such bone screws must sometimes be removed after a longer or shorter implantation time. Existing screws present a problem of difficulty of withdrawal, resulting from the growth of bone cells around the screw. The main object of the present invention is to remedy this problem. There are also bone screws called "compression", for the treatment of fractures. Such a screw has a proximal threaded portion, generally at a conical or cylindro-conical screw head, and a distal threaded portion whose thread has a pitch greater than that of the proximal threaded portion; this upper step causes the rotation of the screw leads to the approximation of a distal bone fragment, in which is inserted the distal threaded portion, relative to a proximal bone fragment, in which is inserted the proximal threaded portion. Existing compression screws, however, have the significant disadvantage of sometimes imperfect retention of one or the other of the two fragments when bringing these fragments together, particularly when the bone is of poor quality. This results in a risk of insufficient approximation of one fragment with respect to the other. The present invention also aims to overcome this disadvantage. According to the invention, the screw has at least one leveling machining, flaring a sector of at least the proximal coil of the thread that comprises at least one threaded portion of the screw, so as to arrange on this turn a recess forming a substantially radial edge, beginning of turn in the direction of unscrewing the screw.

Cette arête de début de spire permet un auto-taraudage de l'os dans le sens du dévissage de la vis, facilitant le dévissage de cette dernière lorsqu'elle doit être retirée après un certain temps d'implantation ayant été suffisamment long pour que se produise une croissance des cellules osseuses autour de la vis.This turn start edge allows a self-tapping of the bone in the unscrewing direction of the screw, facilitating the unscrewing of the latter when it must be removed after a certain implantation time having been long enough for produce growth of bone cells around the screw.

De préférence, ledit usinage d'arasement s'étend sur un secteur de l'ordre de à 500 de la vis. De préférence, la vis comprend une portion filetée distale, et un usinage d'arasement est aménagé sur cette portion filetée distale ; cet usinage d'arasement est aménagé de telle sorte que ladite arête de début de spire soit décalée 10 angulairement par rapport à des faces de coupe de deux dents distales que comprend la vis. Ce décalage angulaire permet d'éliminer tout risque de fragilisation de la structure de la vis qui pourrait sinon résulter de la trop grande proximité, selon la direction longitudinale de la vis, des usinages formant lesdites faces de coupe et de l'usinage d'arasement. Ce décalage angulaire est de préférence de l'ordre de 20°. Selon un autre aspect de l'invention, la vis concernée présente, de manière connue en soi, une portion filetée proximale et une portion filetée distale, le filet de chacune de ces portions filetées étant délimité par un flanc droit, s'étendant sensiblement radialement par rapport au corps de la vis, et par un flanc courbe, opposé au flanc droit ; selon l'invention, l'orientation des flancs est inversée de la portion filetée proximale à la portion filetée distale, le flanc droit étant aménagé du côté distal de la vis sur ladite portion filetée proximale, et étant aménagé sur le côté proximal de la vis sur ladite portion filetée distale.Preferably, said flattening machining extends over a sector of the order of 500 to the screw. Preferably, the screw comprises a distal threaded portion, and a flush machining is provided on this distal threaded portion; this flattening machining is arranged such that said start edge of the turn is offset angularly with respect to cutting faces of two distal teeth that includes the screw. This angular offset makes it possible to eliminate any risk of weakening of the structure of the screw which could otherwise result from the excessive proximity, in the longitudinal direction of the screw, of the machining operations forming said cutting faces and of the machining of leveling. . This angular offset is preferably of the order of 20 °. According to another aspect of the invention, the screw concerned has, in a manner known per se, a proximal threaded portion and a distal threaded portion, the thread of each of these threaded portions being delimited by a straight flank, extending substantially radially. relative to the body of the screw, and by a curved flank, opposite to the right flank; according to the invention, the orientation of the flanks is reversed from the proximal threaded portion to the distal threaded portion, the right side being arranged on the distal side of the screw on said proximal threaded portion, and being arranged on the proximal side of the screw on said distal threaded portion.

Cette inversion permet que le flanc droit du filet de la portion filetée proximale soit en vis-à-vis du flanc droit de la portion filetée distale ; lors du rapprochement de deux fragments d'os au moyen de la vis selon l'invention, les flancs droits respectifs permettent une parfaite prise d'appui de la vis contre les fragments osseux respectifs, au contraire de ce que font les vis selon la technique antérieure, dans lesquelles les flancs droits des filets de la portion filetée proximale et de la portion filetée distale sont aménagés tous les deux du côté proximal de la vis, donc selon la même orientation de la portion filetée proximale à la portion filetée distale. Ladite inversion permet par conséquent d'assurer le rapprochement effectif et efficace des fragments osseux même en cas d'os de mauvaise qualité.This inversion allows the right side of the thread of the proximal threaded portion to face the right side of the distal threaded portion; when bringing together two bone fragments by means of the screw according to the invention, the respective right flanks allow a perfect support of the screw against the respective bone fragments, contrary to what the screws do according to the technique prior, wherein the right flanks of the threads of the proximal threaded portion and the distal threaded portion are both arranged proximally of the screw, thus in the same orientation of the threaded portion proximal to the distal threaded portion. Said inversion thus makes it possible to ensure effective and efficient approximation of the bone fragments even in the case of poor quality bone.

L'invention sera bien comprise, et d'autres caractéristiques et avantages de celle-ci apparaîtront, en référence au dessin schématique annexé, ce dessin représentant, à titre d'exemple non limitatif, une forme de réalisation préférée de la vis à os concernée.The invention will be better understood, and other features and advantages thereof will appear, with reference to the appended schematic drawing, this drawing showing, by way of non-limiting example, a preferred embodiment of the bone screw concerned. .

La figure 3 en est une vue de côté ; la figure 4 est une vue similaire à la figure 3, en coupe passant par l'axe de la vis ; et la figure 5 est une vue de la portion distale de la vis, de côté et à échelle agrandie.Figure 3 is a side view; Figure 4 is a view similar to Figure 3, in section through the axis of the screw; and Figure 5 is a view of the distal portion of the screw, on the side and on an enlarged scale.

Les figures 3 à 5 représentent une vis à os 1 auto-foreuse et auto-taraudeuse, particulièrement destinée au traitement de petits os tels que ceux de la main ou du pied, et ayant par conséquent des dimensions relativement réduites, en particulier un filet distal dont le diamètre est de l'ordre de 3 à 4 mm. La vis 1 comprend un corps 2, une tête cylindrico-conique filetée, formant une portion filetée proximale 3, et une portion filetée distale 4 séparée par une portion médiane lisse du corps 2. La figure 4 montre plus particulièrement que la vis 1 est canulée, délimitant un alésage central 5 permettant son engagement à coulissement sur une broche de guidage, et qu'elle comprend une empreinte proximale 6 de manoeuvre, de type "hexalobes", c'est-à-dire présentant une portion centrale 6a et six cannelures 6b, de section hémicirculaire, communiquant avec cette portion centrale 6a. Ces cannelures 6b sont régulièrement réparties sur la circonférence de cette portion centrale 6a. Il apparaît que la vis 1 comprend trois dents 10 de coupe de l'os, dont chacune 25 est individualisée par un usinage 11 formant une face radiale de coupe et une face inclinée de dégagement. Il apparaît également que le filet de chacune des portions filetées 3 et 4 est délimité par un flanc droit d, s'étendant sensiblement radialement par rapport au corps 2 de la vis 1, et un flanc courbe c, opposé au flanc droit d. Il apparaît 30 également que l'orientation des flancs d et c est inversée de la portion filetée proximale 3 à la portion filetée distale 4: le flanc droit d est aménagé du côté distal de la vis 1 sur la portion filetée proximale 3, et est aménagé sur le côté proximal de la vis 1 sur la portion filetée distale 4, de sorte que les flancs d des deux portions filetées 3, 4 sont en vis-à-vis.FIGS. 3 to 5 show a self-drilling and self-tapping bone screw 1, particularly intended for the treatment of small bones such as those of the hand or the foot, and consequently having relatively small dimensions, in particular a distal thread whose diameter is of the order of 3 to 4 mm. The screw 1 comprises a body 2, a threaded cylindrical-conical head, forming a proximal threaded portion 3, and a distal threaded portion 4 separated by a smooth middle portion of the body 2. Figure 4 shows more particularly that the screw 1 is cannulated , delimiting a central bore 5 allowing its sliding engagement on a guide pin, and that it comprises a proximal 6 operating footprint, type "hexalobes", that is to say having a central portion 6a and six grooves 6b, of semicircular section, communicating with this central portion 6a. These grooves 6b are evenly distributed around the circumference of this central portion 6a. It appears that the screw 1 comprises three cutting teeth 10 of the bone, each 25 of which is individualized by a machining 11 forming a radial cutting face and an inclined release face. It also appears that the thread of each of the threaded portions 3 and 4 is delimited by a right flank d, extending substantially radially relative to the body 2 of the screw 1, and a curved flank c, opposite to the right flank d. It also appears that the orientation of the flanks d and c is reversed from the proximal threaded portion 3 to the distal threaded portion 4: the right flank d is arranged on the distal side of the screw 1 on the proximal threaded portion 3, and is arranged on the proximal side of the screw 1 on the distal threaded portion 4, so that the flanks d of the two threaded portions 3, 4 are vis-à-vis.

Lors du rapprochement de deux fragments d'os au moyen de la vis 1, les flancs droits d prennent appui contre les fragments osseux respectifs ; ils assurent ainsi un rapprochement effectif et efficace de ces fragments osseux même en cas d'os de mauvaise qualité.When bringing together two bone fragments by means of the screw 1, the right flanks d bear against the respective bone fragments; they thus ensure effective and efficient approximation of these bone fragments even in the case of poor bone quality.

En référence aux figures 3 et 5, il apparaît également que la vis 1 présente deux usinages d'arasement 15, 16, dont celui proximal 15 arase un secteur d'environ 35° des deux spires proximales du filet de la portion filetée proximale 3 et celui distal 16 arase un secteur d'environ 15° des deux spires proximales du filet de la portion filetée distale 4. Ces usinages d'arasement 15, 16 aménagent sur les spires concernées un décrochement formant une arête 17 sensiblement radiale, de début de spire dans le sens du dévissage de la vis 1. L'usinage d'arasement 16 est aménagé de telle sorte que l'arête 17 qu'il forme soit décalée angulairement d'environ 20° par rapport aux faces de coupe 12 de deux dents 10, afin d'éliminer tout risque de fragilisation de la structure de la vis 1 qui pourrait sinon résulter de la trop grande proximité des usinages 16 et 11. Les arêtes 17 permettent un auto-taraudage de l'os dans le sens du dévissage de la vis 1, facilitant le dévissage de cette dernière lorsqu'elle doit être retirée après un temps d'implantation ayant été suffisant pour que se produise une croissance des cellules osseuses autour de la vis.With reference to FIGS. 3 and 5, it also appears that the screw 1 has two leveling machining operations 15, 16, of which the proximal one 15 projects a sector of about 35 ° from the two proximal turns of the thread of the proximal threaded portion 3 and the distal one 16 arase a sector of about 15 ° of the two proximal turns of the thread of the distal threaded portion 4. These machining of recess 15, 16 arrange on the turns concerned a recess forming a substantially radial ridge 17, beginning of turn in the direction of unscrewing of the screw 1. The leveling machining 16 is arranged such that the edge 17 that it forms is angularly offset by about 20 ° with respect to the cutting faces 12 of two teeth 10 , in order to eliminate any risk of weakening of the structure of the screw 1 which could otherwise result from the excessive proximity of the machining operations 16 and 11. The ridges 17 allow self-tapping of the bone in the direction of the unscrewing of the screw 1, making it easier to screw the latter when it has to be removed after an implantation time has been sufficient for growth of bone cells around the screw.

Ainsi que cela apparaît de ce qui précède, l'invention fournit une vis à os remédiant à de nombreux inconvénients et problèmes des vis homologues selon la technique antérieure. L'invention a été décrite ci-dessus en référence à une forme de réalisation fournie à titre d'exemple. Il va de soi qu'elle n'est pas limitée à cette forme de réalisation mais qu'elle s'étend à toutes les autres formes de réalisation couvertes par les revendications ci-annexées.As will be apparent from the foregoing, the invention provides a bone screw overcoming many of the disadvantages and problems of counterbores according to the prior art. The invention has been described above with reference to an embodiment provided by way of example. It goes without saying that it is not limited to this embodiment but that it extends to all other embodiments covered by the appended claims.

Claims (5)

REVENDICATIONS1 - Vis à os (1), caractérisée en ce qu'elle comprend au moins un usinage d'arasement (15, 16), arasant un secteur d'au moins la spire proximale du filet que comprend au moins une portion filetée (3, 4) de la vis, de manière à aménager sur cette spire un décrochement formant une arête (17) sensiblement radiale, de début de spire dans le sens du dévissage de la vis (1).CLAIMS1 - Bone screw (1), characterized in that it comprises at least one leveling machining (15, 16), flaring a sector of at least the proximal turn of the thread that comprises at least one threaded portion (3 , 4) of the screw, so as to arrange on this turn a recess forming a ridge (17) substantially radial, beginning of turn in the direction of unscrewing of the screw (1). 2 - Vis (1) selon la revendication 1, caractérisée en ce que ledit usinage (15, 16) d'arasement s'étend sur un secteur de l'ordre de 10 à 500 de la vis.2 - screw (1) according to claim 1, characterized in that said machining (15, 16) leveling extends over a sector of the order of 10 to 500 of the screw. 3 - Vis (1) selon la revendication 1 ou la revendication 2, comprenant une portion filetée distale (4), caractérisée en ce qu'un usinage d'arasement (16) est aménagé sur cette portion filetée distale (4) en étant aménagé de telle sorte que ladite arête (17) de début de spire soit décalée angulairement par rapport à des faces de coupe (12) de deux dents (10) distales que comprend de la vis.3 - screw (1) according to claim 1 or claim 2, comprising a distal threaded portion (4), characterized in that a machining operation (16) is arranged on the distal threaded portion (4) being arranged such that said start edge (17) of turn is angularly offset relative to cutting faces (12) of two distal teeth (10) that comprises the screw. 4 - Vis (1) selon la revendication 3, caractérisée en ce que le décalage angulaire est de l'ordre de 20°.4 - Screw (1) according to claim 3, characterized in that the angular offset is of the order of 20 °. 5 - Vis (1) selon l'une des revendications 1 à 4, présentant une portion filetée proximale (3) et une portion filetée distale (4), le filet de chacune de ces portions filetées (3, 4) étant délimité par un flanc droit (d), s'étendant sensiblement radialement par rapport au corps (2) de la vis (1), et par un flanc courbe (c), opposé au flanc droit (d), caractérisée en ce que l'orientation des flancs (d, c) est inversée de la portion filetée proximale (3) à la portion filetée distale (4), le flanc droit (d) étant aménagé du côté distal de la vis (1) sur ladite portion filetée proximale (3), et étant aménagé sur le côté proximal de la vis sur ladite portion filetée distale (4).5 - Screw (1) according to one of claims 1 to 4, having a proximal threaded portion (3) and a distal threaded portion (4), the thread of each of these threaded portions (3, 4) being delimited by a right flank (d), extending substantially radially relative to the body (2) of the screw (1), and by a curved flank (c), opposite to the right flank (d), characterized in that the orientation of the flanks (d, c) is reversed from the proximal threaded portion (3) to the distal threaded portion (4), the right flank (d) being provided on the distal side of the screw (1) on said proximal threaded portion (3) , and being arranged on the proximal side of the screw on said distal threaded portion (4).
FR1350067A 2013-01-04 2013-01-04 BONE SCREW Expired - Fee Related FR3000664B3 (en)

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FR3000664B3 FR3000664B3 (en) 2015-07-03

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018195377A1 (en) * 2017-04-21 2018-10-25 DePuy Synthes Products, Inc. Angled flutes in cannulated bone screws
BE1026273B1 (en) * 2018-10-02 2019-12-05 Dr Lootens Tom Bvba Screw device and assembly
US10772667B2 (en) 2017-12-22 2020-09-15 Medos International Sarl Bone screw with cutting tip
US10939944B2 (en) 2018-04-18 2021-03-09 Glw, Inc. Removable orthopedic screws
US11376050B2 (en) 2017-06-27 2022-07-05 Medos International Sarl Bone screw
EP4052672A1 (en) * 2021-03-05 2022-09-07 Biedermann Technologies GmbH & Co. KG Bone anchor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018195377A1 (en) * 2017-04-21 2018-10-25 DePuy Synthes Products, Inc. Angled flutes in cannulated bone screws
CN110831531A (en) * 2017-04-21 2020-02-21 德普伊新特斯产品公司 Angled grooves in cannulated bone screws
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