WO1997001990A1 - Intramedullary pin - Google Patents

Intramedullary pin Download PDF

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Publication number
WO1997001990A1
WO1997001990A1 PCT/BE1995/000062 BE9500062W WO9701990A1 WO 1997001990 A1 WO1997001990 A1 WO 1997001990A1 BE 9500062 W BE9500062 W BE 9500062W WO 9701990 A1 WO9701990 A1 WO 9701990A1
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WO
WIPO (PCT)
Prior art keywords
bone
pin
intramedullary
loop
spindle
Prior art date
Application number
PCT/BE1995/000062
Other languages
French (fr)
Inventor
Dominique Persoons
Original Assignee
Dominique Persoons
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 Dominique Persoons filed Critical Dominique Persoons
Priority to PCT/BE1995/000062 priority Critical patent/WO1997001990A1/en
Priority to EP95924116A priority patent/EP0835080A1/en
Publication of WO1997001990A1 publication Critical patent/WO1997001990A1/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
    • A61B17/72—Intramedullary pins, nails or other devices
    • A61B17/7208—Flexible pins, e.g. ENDER pins

Definitions

  • the invention relates to an intramedullary spindle, and in particular an intramedullary spindle for the elastic and stable support of long bones for osteosynthesis.
  • an elastic intramedullary spindle consisting of a rod of biocompatible material, of section adapted to the bone to be treated.
  • osteosynthesis of long bones is limited by the fragility of the bone structure, in particular the cortical bone of the elderly. Osteoporosis facilitates perforation of the bone by the intramedullary spindle, leading to compaction of the fracture site and secondary displacement of the fractured bone despite the presence of the reducing pin (s).
  • an intramedullary pin usable both in childhood trauma and in the elderly, where elastic and stable support is sought in order to promote osteosynthesis, reducing the risk of perforation bone epiphysis or growth cartilage, while effectively preventing secondary compaction of the bone.
  • An object of the invention is therefore to provide an intramedullary pin, implantable in the bone with a view to
  • the rod is folded back on itself, so as to form at least one branch ending in a loop at one head end of the spindle.
  • the rod is folded back on itself, substantially at 180 °, approximately in the middle of its length, so as to form two branches substantially of the same length, connected by the head portion in a loop.
  • the mean plane of the loop makes an angle relative to the longitudinal axis of the pin, in order to facilitate the intramedullary insertion of the pin.
  • FIG. 1 schematically represents an intramedullary pin according to the invention
  • FIG. 2 schematically represents another embodiment of the pin of FIG. 1,
  • Figure 3 schematically shows a variant of the pin of Figure 2
  • FIG. 4 schematically represents in longitudinal section, a long bone presenting a multiple fracture, provided with an intramedullary pin according to the invention
  • FIG. 5 is a view, similar to FIG. 4, of a bone presenting an oblique fracture
  • FIG. 6 is a view, similar to FIG. 5, of a bone presenting a multiple fracture, provided with an intramedullary pin of the known technique.
  • the pin 1 according to the invention consists of a rod 2 folded back to form a loop 3 at one end, which is the head end, to be inserted substantially up to the cortical wall, at the epiphysis of the fractured bone.
  • the terminal part of loop 3 is presented set back from the maximum width "d 'of the loop 3. Although this is not shown in the drawing, the loop 3 can be closed, in the form of a ring.
  • the pin 1 is formed of a rod folded substantially in the middle, to form two branches 2, 2 ′ connected at the head by a loop 3.
  • the variant of FIG. 3 differs from the embodiment of FIG. 2 in that the head part comprising the loop 3 makes an angle ⁇ with respect to the rest of the longitudinal extent of the spindle.
  • the purpose of this variant is simply to facilitate the initial insertion of the head of the spindle into the bone, as will be seen below.
  • the branches 2, 2 ′ are shown to be substantially rectilinear, with the exception of the elbow at the angle ⁇ in FIG. 3, and parallel, but it is obvious that this does not constitute a parameter of l 'invention.
  • the spacing between the branches may not be constant, and they may if necessary be braided together if this has an advantage, for example for reasons of mechanical strength, or convenience of insertion, but at the expense of elasticity.
  • the surface defined by the branches 2, 2 ′ and the loop 3 will generally be a left surface, taking into account the deformability of the rod constituting the spindle.
  • the deflection angle ⁇ marked in the drawing therefore represents the angle of the mean plane of the head portion, with respect to the mean plane of the branches 2, 2 ', rather than the actual angle of curvature of the branches 2, 2'.
  • the aim of this angle is to facilitate the insertion of the head of the spindle into the medullary canal, and its value is therefore not critical for the invention.
  • Figures 4 and 5 show a pin of the invention in position in a long bone
  • Figure 6 is a view similar to Figure 4, but with a straight pin of the known technique, represented as having perforated the cortical wall.
  • FIG. 4 to 6 there is shown a pin 1, 1 'inserted in a long bone 10 shown in schematic section, with two epiphyses 11, 12 connected by the diaphysis 13, and a medullary canal 14.
  • the surgeon folds the end of the foot 16 into the opening 15, to block this end relative to the bone.
  • the angle ⁇ of the head part of FIG. 3 facilitates the initial crossing of the elbow between the opening 15 and the medullary canal 14, during the passage of the head 3; for the remainder of the operation, the spindle is flexible enough to be flexed elastically as said elbow passes.
  • FIGS. 4 to 6 also indicate by arrows "A" the direction of the forces exerted by the muscles and tendons on a long bone, forces which go in the direction of a longitudinal compression of the bone.
  • the loop 3 of the pin of the invention provides a greater contact surface between the pin and the bone, and therefore reduces the pressure on the bone, and the risk of perforation.
  • This effect is further reinforced by the fact that, unlike the steep end of the known spindle, which tends by nature to have a perforating effect (force in the axis of the rod), the loop 3 of the spindle the invention with its curved contact surface has no perforating effect.
  • the two branches (2, 2 ') have substantially the same length, which means that they must both reach the opening 15 for insertion into the 'bone, to allow the need to remove the pin.
  • the embodiment of the broach with two branches, according to FIGS. 2 and 3, is preferred compared to the embodiment with a branch of FIG. 1. Indeed, the surgeon is frequently required to place several pins in the same bone , and the loops of crooked pins according to FIG. 1 are more likely to become entangled, making possible extraction difficult. Also, with equal cross section, the size of two pins in the stock according to FIG. 1 is greater than that of a pin with two branches according to FIGS. 2 and 3, and the placement will therefore be more difficult. Finally, the two branches 2, 2 ′ of a spindle according to FIGS. 2 and 3 will each be thinner, and will therefore have greater elasticity than the single branch 2 of the embodiment of FIG. 1, with equal total section .
  • an effective pin has been provided for the elastic consolidation of long bones, while avoiding or reducing the risk of perforation, in a simple and economical manner, since it suffices to fold back on itself, preferably substantially at mid-length, a conventional pin rod.
  • the spinal cord of the invention is useful in long bones, including small bones, such as those of the hand.
  • the diameter of the loop 3 is not in itself a parameter of the invention, and it can in particular be as large as the fractured bone allows.
  • the effectiveness of the solution of the invention seems to result from the combination of an increase in the contact surface between the end of the pin and the bone epiphysis, which reduces the maximum local pressure on the bone tissue, and an increase in the elasticity of the spindle, resulting from its curvature.

Abstract

An intramedullary pin for implanting into a bone to enable long bone osteosynthesis. The intramedullary pin (1) may be substantially prevented from perforating the epiphyseal bone (11) by bending back the shaft to form at least one and preferably two sections (2, 2') ending in a loop (3) at the front end of the pin.

Description

1990 PC17BE95/000621990 PC17BE95 / 00062
11
BROCHE INTRA-MEDULLAIREINTRA-MEDULAR PIN
L'invention concerne une broche intra-médullaire, et en particulier une broche intra-médullaire pour le soutien élastique et stable d'os longs en vue de 1 'ostéosynthèse.The invention relates to an intramedullary spindle, and in particular an intramedullary spindle for the elastic and stable support of long bones for osteosynthesis.
On connaît dans la technique une broche intra- médullaire élastique, constituée d'une tige en matériau biocompatible, de section adaptée à l'os à traiter.There is known in the art an elastic intramedullary spindle, consisting of a rod of biocompatible material, of section adapted to the bone to be treated.
En pratique cependant, 1 Ostéosynthèse des os longs est limitée par la fragilité de la trame osseuse, en particulier l'os cortical des personnes âgées. L'ostéoporose facilite une perforation de l'os par la broche intra-médullaire, conduisant à un tassement du foyer de fracture et au déplacement secondaire de l'os fracturé malgré la présence de la ou des broches réductrices.In practice, however, osteosynthesis of long bones is limited by the fragility of the bone structure, in particular the cortical bone of the elderly. Osteoporosis facilitates perforation of the bone by the intramedullary spindle, leading to compaction of the fracture site and secondary displacement of the fractured bone despite the presence of the reducing pin (s).
Chez l'enfant au contraire, l'os lui-même est très dense, mais le cartilage de conjugaison ou croissance osseuse plus fragile ne peut être perforé sous peine de troubles ultérieurs. Là également, une broche élastique en forme de tige peut se révéler dangereuse.On the contrary, in children, the bone itself is very dense, but the cartilage of conjugation or more fragile bone growth cannot be perforated under pain of subsequent disorders. Again, an elastic pin in the shape of a rod can be dangerous.
Plusieurs solutions ont été proposées en vue d'éviter tant la perforation que le tassement secondaire de l'os: brochages en croix, brochages cimentés (technique du diabolo) , broches droites précontraintes en légères flexionSeveral solutions have been proposed in order to avoid both the perforation and the secondary compaction of the bone: cross pinning, cemented pinning (diabolo technique), straight pins preloaded in slight bending
(Métaizeau), broches-vis et analogues.(Metaizeau), screw pins and the like.
Selon l'invention, on se propose de fournir une broche intra-médullaire utilisable aussi bien en traumatologie infantile que chez le vieillard, là où un soutien élastique et stable est recherché en vue de favoriser 1 Ostéosynthèse, en réduisant le risque d'une perforation de l'épiphyse osseuse ou du cartilage de croissance, tout en empêchant de manière efficace le tassement secondaire de l'os.According to the invention, it is proposed to provide an intramedullary pin usable both in childhood trauma and in the elderly, where elastic and stable support is sought in order to promote osteosynthesis, reducing the risk of perforation bone epiphysis or growth cartilage, while effectively preventing secondary compaction of the bone.
Un but de 1 ' invention est donc de fournir une broche intra-médullaire, implantable dans l'os en vue deAn object of the invention is therefore to provide an intramedullary pin, implantable in the bone with a view to
1 'ostéosynthèse des os longs, constituée d'une tige en matériau biocompatible, caractérisée en ce que, en vue de prévenir sensiblement le risque de perforation de l'os épiphysaire par la broche intra-médullaire, la tige est repliée sur elle-même, de manière à former au moins une branche terminée par une boucle à une extrémité de tête de la broche. Selon une autre caractéristique de l'invention, la tige est repliée sur elle-même, sensiblement à 180°, sensiblement au milieu de sa longueur, de manière à former deux branches sensiblement de même longueur, reliées par la partie de tête en boucle. Selon encore une autre caractéristique de l'invention, le plan moyen de la boucle fait un angle par rapport à l'axe longitudinal de la broche, en vue de faciliter l'insertion intra-médullaire de la broche.1 osteosynthesis of long bones, consisting of a rod of biocompatible material, characterized in that, with a view to substantially preventing the risk of perforation of the bone epiphyseal by the intramedullary spindle, the rod is folded back on itself, so as to form at least one branch ending in a loop at one head end of the spindle. According to another characteristic of the invention, the rod is folded back on itself, substantially at 180 °, approximately in the middle of its length, so as to form two branches substantially of the same length, connected by the head portion in a loop. According to yet another characteristic of the invention, the mean plane of the loop makes an angle relative to the longitudinal axis of the pin, in order to facilitate the intramedullary insertion of the pin.
D'autres aspects, caractéristiques et avantages de l'invention apparaîtront de la description qui suit, et du dessin annexé sur lequel:Other aspects, characteristics and advantages of the invention will become apparent from the description which follows, and from the appended drawing in which:
La figure 1 représente schématiquement une broche intra-médullaire selon l'invention,FIG. 1 schematically represents an intramedullary pin according to the invention,
La figure 2 représente schématiquement un autre mode de réalisation de la broche de la figure 1 ,FIG. 2 schematically represents another embodiment of the pin of FIG. 1,
La figure 3 représente schématiquement une variante de la broche de la figure 2Figure 3 schematically shows a variant of the pin of Figure 2
La figure 4 représente schématiquement et en coupe longitudinale, un os long présentant une fracture multiple, doté d'une broche intra-médullaire selon l'invention,FIG. 4 schematically represents in longitudinal section, a long bone presenting a multiple fracture, provided with an intramedullary pin according to the invention,
La figure 5 est une vue semblable à la figure 4, d'un os présentant une fracture oblique, etFIG. 5 is a view, similar to FIG. 4, of a bone presenting an oblique fracture, and
La figure 6 est une vue semblable à la figure 5, d'un os présentant une fracture multiple, doté d'une broche intra-médullaire de la technique connue.FIG. 6 is a view, similar to FIG. 5, of a bone presenting a multiple fracture, provided with an intramedullary pin of the known technique.
En se reportant à la figure 1 , la broche 1 selon l'invention est constituée d'une tige 2 repliée pour former une boucle 3 à une extrémité, qui est l'extrémité de tête, à insérer sensiblement jusqu'à la paroi corticale, à l'épiphyse de l'os fracturé.Referring to FIG. 1, the pin 1 according to the invention consists of a rod 2 folded back to form a loop 3 at one end, which is the head end, to be inserted substantially up to the cortical wall, at the epiphysis of the fractured bone.
Pour permettre une extraction éventuelle de la broche 1 de l'os, la partie terminale de la boucle 3 se présente en retrait par rapport a la largeur maximale "d ' de la boucle 3. Bien que cela ne soit pas représenté au dessin, la boucle 3 peut être fermée, en forme d'anneau.To allow possible extraction of pin 1 from the bone, the terminal part of loop 3 is presented set back from the maximum width "d 'of the loop 3. Although this is not shown in the drawing, the loop 3 can be closed, in the form of a ring.
En se reportant au mode de réalisation de la figure 2, la broche 1 est formée d'une tige repliée sensiblement en son milieu, pour former deux branches 2, 2' reliées en tête par une boucle 3.Referring to the embodiment of FIG. 2, the pin 1 is formed of a rod folded substantially in the middle, to form two branches 2, 2 ′ connected at the head by a loop 3.
La variante de la figure 3 diffère du mode de réalisation de la figure 2 en ce que la partie de tête comportant la boucle 3 fait un angle α par rapport au reste de l'étendue longitudinale de la broche. Le but de cette variante est simplement de faciliter l'insertion initiale de la tête de la broche dans l'os, comme on le verra plus loin. Pour la commodité du dessin, on a représenté les branches 2, 2' sensiblement rectilignes, à l'exception du coude suivant l'angle α de la figure 3, et parallèles, mais il est évident que ceci ne constitue par un paramètre de l'invention. Ainsi, l'écartement entre les branches peut ne pas être constant, et elles peuvent au besoin être tressées ensemble si cela présente un avantage, par exemple pour des questions de résistance mécanique, ou de commodité d'insertion, mais au détriment de l'élasticité.The variant of FIG. 3 differs from the embodiment of FIG. 2 in that the head part comprising the loop 3 makes an angle α with respect to the rest of the longitudinal extent of the spindle. The purpose of this variant is simply to facilitate the initial insertion of the head of the spindle into the bone, as will be seen below. For the convenience of the drawing, the branches 2, 2 ′ are shown to be substantially rectilinear, with the exception of the elbow at the angle α in FIG. 3, and parallel, but it is obvious that this does not constitute a parameter of l 'invention. Thus, the spacing between the branches may not be constant, and they may if necessary be braided together if this has an advantage, for example for reasons of mechanical strength, or convenience of insertion, but at the expense of elasticity.
De même, il est clair que la surface définie par les branches 2, 2' et la boucle 3 sera généralement une surface gauche, compte tenu de la déformabilité de la tige constituant la broche. L'angle de déviation α marqué au dessin représente donc 1 ' angle du plan moyen de la partie de tête, par rapport au plan moyen des branches 2, 2', plutôt que l'angle de courbure réel des branches 2, 2' . Comme on l'a dit plus haut, cet angle a pour but de faciliter l'insertion de la tête de la broche dans le canal médullaire, et sa valeur n'est donc pas critique pour 1 ' invention. Les figures 4 et 5 représentent un broche de l'invention en position dans un os long, tandis que la figure 6 est une vue semblable à la figure 4, mais avec une broche droite de la technique connue, représentée comme ayant perforé la paroi corticale.Likewise, it is clear that the surface defined by the branches 2, 2 ′ and the loop 3 will generally be a left surface, taking into account the deformability of the rod constituting the spindle. The deflection angle α marked in the drawing therefore represents the angle of the mean plane of the head portion, with respect to the mean plane of the branches 2, 2 ', rather than the actual angle of curvature of the branches 2, 2'. As mentioned above, the aim of this angle is to facilitate the insertion of the head of the spindle into the medullary canal, and its value is therefore not critical for the invention. Figures 4 and 5 show a pin of the invention in position in a long bone, while Figure 6 is a view similar to Figure 4, but with a straight pin of the known technique, represented as having perforated the cortical wall.
En se reportant aux figures 4 à 6, on y a représenté une broche 1 , 1 ' insérée dans un os long 10 représenté en coupe schématique, avec deux épiphyses 11, 12 reliées par la diaphyse 13, et un canal médullaire 14. La broche 1, 1 ' est insérée dans le canal médullaire 14 par une ouverture 15 percée dans la paroi de l'os.Referring to Figures 4 to 6, there is shown a pin 1, 1 'inserted in a long bone 10 shown in schematic section, with two epiphyses 11, 12 connected by the diaphysis 13, and a medullary canal 14. The pin 1, 1 'is inserted into the medullary canal 14 through an opening 15 pierced in the wall of the bone.
Après avoir inséré la broche jusqu'à ce que sa tête bute contre l'os cortical de 1 'épiphyse 11, le chirurgien plie l'extrémité de pied 16 dans l'ouverture 15, pour bloquer cette extrémité par rapport à l'os.After inserting the pin until his head abuts the cortical bone of the epiphysis 11, the surgeon folds the end of the foot 16 into the opening 15, to block this end relative to the bone.
L'angle α de la partie de tête de la figure 3 facilite le franchissement initial du coude entre l'ouverture 15 et la canal médullaire 14, lors du passage de la tête 3; pour la suite de l'opération, le broche est suffisamment souple pour être fléchie élastiquement au passage dudit coude.The angle α of the head part of FIG. 3 facilitates the initial crossing of the elbow between the opening 15 and the medullary canal 14, during the passage of the head 3; for the remainder of the operation, the spindle is flexible enough to be flexed elastically as said elbow passes.
Aux figures 4 à 6 on a également indiqué par des flèches "A" la direction des efforts que les muscles et les tendons exercent sur un os long, efforts qui vont dans le sens d'une compression longitudinale de l'os.FIGS. 4 to 6 also indicate by arrows "A" the direction of the forces exerted by the muscles and tendons on a long bone, forces which go in the direction of a longitudinal compression of the bone.
Dans le cas d'une fracture multiple (figure 4), cet effort de compression tend à rapprocher les deux lèvres 17, 17' de la fracture, en écartant les fragments osseux 18, avec raccourcissement de l'os. Dans le cas d'un plan de fracture oblique par rapport à l'axe longitudinal de l'os (figure 5), la résultante l'effort de compression tend à faire glisser lèvres de la fracture latéralement, avec également un raccourcissement de l'os et mauvaise consolidation de la fracture.In the case of a multiple fracture (FIG. 4), this compression force tends to bring the two lips 17, 17 ′ closer to the fracture, by removing the bone fragments 18, with shortening of the bone. In the case of a plane of fracture oblique to the longitudinal axis of the bone (Figure 5), the resulting compression force tends to slide the lips of the fracture laterally, with also a shortening of the bone and poor consolidation of the fracture.
Le but de la broche 1, 1 ' est de permettre à l'os fracturé de résister à ces efforts en maintenant la fracture réduite, et ce de manière élastique, malgré la fragilité de l'os. L'expérience montre cependant que la tête de la broche droite 1 ' connue a tendance à perforer l 'os à l'épiphyse 11 (comme schématisé à la figure 6), lorsqu'il n'est pas assez résistant comme chez le vieillard; elle n'assure dès lors plus sa fonction de résistance à l'effort de compression longitudinal des tendons et des muscles. Chez l'enfant, elle tend par contre à perforer le cartilage de croissance osseuse, avec des risques de séquelles sur la croissance. En se reportant maintenant aux figures 4 et 5, il est clair que la boucle 3 de la broche de l'invention assure une plus grande surface de contact entre la broche et l'os, et réduit dès lors la pression sur l'os, et le risque de perforation. Cet effet est encore renforcé par le fait que, à la différence de l'extrémité abrupte de la broche connue, qui tend par nature à avoir un effet perforant (force dans l'axe de la tige), la boucle 3 de la broche de l'invention avec sa surface de contact courbe ne présente pas d'effet perforant.The purpose of the spindle 1, 1 'is to allow the fractured bone to resist these forces while maintaining the reduced fracture, and this in an elastic manner, despite the brittleness of the bone. However, experience shows that the head of the known right spindle 1 'tends to perforate the bone at the epiphysis 11 (as shown diagrammatically in FIG. 6), when it is not enough resistant as in the old man; it therefore no longer performs its function of resistance to the longitudinal compression force of the tendons and muscles. In children, however, it tends to perforate the bone growth cartilage, with risks of sequelae on growth. Referring now to FIGS. 4 and 5, it is clear that the loop 3 of the pin of the invention provides a greater contact surface between the pin and the bone, and therefore reduces the pressure on the bone, and the risk of perforation. This effect is further reinforced by the fact that, unlike the steep end of the known spindle, which tends by nature to have a perforating effect (force in the axis of the rod), the loop 3 of the spindle the invention with its curved contact surface has no perforating effect.
Selon l'invention, il est d'autre part important que les deux branches (2, 2' ) aient sensiblement la même longueur, ce par quoi on entend qu'elles doivent toutes les deux atteindre l'ouverture 15 d'insertion dans l'os, pour permettre au besoin de retirer la broche.According to the invention, it is also important that the two branches (2, 2 ') have substantially the same length, which means that they must both reach the opening 15 for insertion into the 'bone, to allow the need to remove the pin.
Le mode de réalisation de la broche à deux branches, selon les figures 2 et 3, est préféré par rapport au mode de réalisation à une branche de la figure 1. En effet, le chirurgien est fréquemment amené à placer plusieurs broches dans un même os, et les boucles de broches en crosse selon la figure 1 risquent plus facilement de s'enchevêtrer, en rendant une éventuelle extraction difficile. Egalement, à section égale 1 ' encombrement de deux broches en crosse selon la figure 1 est plus important que celui d'une broche à deux branches selon les figures 2 et 3, et le placement en sera dès lors plus difficile. Enfin, les deux branches 2, 2' d'une broche selon les figures 2 et 3 seront chacune plus fines, et présenteront dès lors une plus grande élasticité que la branche unique 2 du mode de réalisation de la figure 1, à section totale égale.The embodiment of the broach with two branches, according to FIGS. 2 and 3, is preferred compared to the embodiment with a branch of FIG. 1. Indeed, the surgeon is frequently required to place several pins in the same bone , and the loops of crooked pins according to FIG. 1 are more likely to become entangled, making possible extraction difficult. Also, with equal cross section, the size of two pins in the stock according to FIG. 1 is greater than that of a pin with two branches according to FIGS. 2 and 3, and the placement will therefore be more difficult. Finally, the two branches 2, 2 ′ of a spindle according to FIGS. 2 and 3 will each be thinner, and will therefore have greater elasticity than the single branch 2 of the embodiment of FIG. 1, with equal total section .
Selon l'invention, on a donc fourni un broche efficace pour la consolidation élastique des os longs, tout en évitant ou en réduisant le risque de perforation, et ce de manière simple et économique, puisqu'il suffit de replier sur elle-même, de préférence sensiblement à mi-longueur, une tige à broche classique. Comme on 1 'a mentionné ci-dessus, la broche médullaire de l'invention est utile dans les os longs, en ce compris des petits os, comme ceux de la main.According to the invention, therefore, an effective pin has been provided for the elastic consolidation of long bones, while avoiding or reducing the risk of perforation, in a simple and economical manner, since it suffices to fold back on itself, preferably substantially at mid-length, a conventional pin rod. As mentioned above, the spinal cord of the invention is useful in long bones, including small bones, such as those of the hand.
Le diamètre de la boucle 3 n'est pas en soi un paramètre de l'invention, et il peut en particulier être aussi grand que le permet l'os fracturé.The diameter of the loop 3 is not in itself a parameter of the invention, and it can in particular be as large as the fractured bone allows.
Bien que 1 ' invention ne soit pas limitée par cette explication, l'efficacité de la solution de l'invention semble résulter de la combinaison d'un accroissement de la surface de contact entre l'extrémité de la broche et 1 ' épiphyse osseuse, qui réduit la pression locale maximum sur le tissu osseux, et d'un accroissement de l'élasticité de la broche, résultant de sa courbure. Although the invention is not limited by this explanation, the effectiveness of the solution of the invention seems to result from the combination of an increase in the contact surface between the end of the pin and the bone epiphysis, which reduces the maximum local pressure on the bone tissue, and an increase in the elasticity of the spindle, resulting from its curvature.

Claims

Revendications claims
1. Broche intra-médullaire, implantable dans l'os en vue de 1 'ostéosynthèse des os longs, constituée d'une tige en matériau biocompatible, caractérisée en ce que, en vue de prévenir sensiblement le risque de perforation de l'os epiphysaire (11) par la broche intra-médullaire (1), la tige est repliée sur elle-même, de manière à former au moins une branche (2) terminée par une boucle (3) à une extrémité de tête de la broche. 1. intramedullary pin, implantable in the bone for the osteosynthesis of long bones, consisting of a rod of biocompatible material, characterized in that, with a view to substantially preventing the risk of perforation of the epiphyseal bone (11) by the intramedullary pin (1), the rod is folded back on itself, so as to form at least one branch (2) ending in a loop (3) at one end of the pin head.
2. Broche intra-médullaire selon la revendication 1, caractérisée en ce que la tige est repliée sur elle-même, sensiblement à 180°, sensiblement au milieu de sa longueur, de manière à former deux branches (2, 2' ) sensiblement de même longueur, reliées par la partie de tête en boucle (3). 2. intramedullary pin according to claim 1, characterized in that the rod is folded back on itself, substantially at 180 °, substantially in the middle of its length, so as to form two branches (2, 2 ') substantially same length, connected by the looped head part (3).
3. Broche intra-médullaire selon la revendication 1 ou 2 caractérisée en ce que, en vue de faciliter l'insertion intra-médullaire de la broche ( 1 ) , le plan moyen de la boucle (3) fait un angle α par rapport à l'axe longitudinal de la broche. 3. intramedullary pin according to claim 1 or 2 characterized in that, in order to facilitate the intramedullary insertion of the pin (1), the mean plane of the loop (3) makes an angle α with respect to the longitudinal axis of the spindle.
PCT/BE1995/000062 1995-06-30 1995-06-30 Intramedullary pin WO1997001990A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/BE1995/000062 WO1997001990A1 (en) 1995-06-30 1995-06-30 Intramedullary pin
EP95924116A EP0835080A1 (en) 1995-06-30 1995-06-30 Intramedullary pin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BE1995/000062 WO1997001990A1 (en) 1995-06-30 1995-06-30 Intramedullary pin

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WO1997001990A1 true WO1997001990A1 (en) 1997-01-23

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7052498B2 (en) 1998-10-26 2006-05-30 Expanding Orthopedics, Inc. Expandable orthopedic device
FR2915670A1 (en) * 2007-05-02 2008-11-07 Xavier Renard Intramedullary pin for long bone i.e. metacarpus, has connecting unit connecting free ends of buckle with ends of rods respectively such that rods are parallel and ends of rods are opposite with respect to one another
WO2009027797A3 (en) * 2007-08-27 2009-07-16 Alexander Bukreev Device for the osteosynthesis of fractures and luxations of the neck of the humerus
US8663224B2 (en) 2010-09-09 2014-03-04 DePuy Synthes Products, LLC Surgical nail

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE824377C (en) * 1949-12-11 1951-12-10 H C Ernst Pohl Dr Med Device for pulling together the fracture ends of a broken tubular bone
FR2221111A1 (en) * 1973-02-06 1974-10-11 Ender Josef
AT376119B (en) * 1982-12-03 1984-10-10 Bruno Dr Zifko MARKER WIRE AND TOOL FOR INSERTING AND REMOVING SUCH MARKER WIRE
EP0428985A1 (en) * 1989-11-21 1991-05-29 Synthes AG, Chur Intramedullary nail with loop tip

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE824377C (en) * 1949-12-11 1951-12-10 H C Ernst Pohl Dr Med Device for pulling together the fracture ends of a broken tubular bone
FR2221111A1 (en) * 1973-02-06 1974-10-11 Ender Josef
AT376119B (en) * 1982-12-03 1984-10-10 Bruno Dr Zifko MARKER WIRE AND TOOL FOR INSERTING AND REMOVING SUCH MARKER WIRE
EP0428985A1 (en) * 1989-11-21 1991-05-29 Synthes AG, Chur Intramedullary nail with loop tip

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7052498B2 (en) 1998-10-26 2006-05-30 Expanding Orthopedics, Inc. Expandable orthopedic device
FR2915670A1 (en) * 2007-05-02 2008-11-07 Xavier Renard Intramedullary pin for long bone i.e. metacarpus, has connecting unit connecting free ends of buckle with ends of rods respectively such that rods are parallel and ends of rods are opposite with respect to one another
WO2009027797A3 (en) * 2007-08-27 2009-07-16 Alexander Bukreev Device for the osteosynthesis of fractures and luxations of the neck of the humerus
US8663224B2 (en) 2010-09-09 2014-03-04 DePuy Synthes Products, LLC Surgical nail

Also Published As

Publication number Publication date
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