WO2006084994A1 - Osteosynthesis equipment - Google Patents

Osteosynthesis equipment Download PDF

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Publication number
WO2006084994A1
WO2006084994A1 PCT/FR2006/000284 FR2006000284W WO2006084994A1 WO 2006084994 A1 WO2006084994 A1 WO 2006084994A1 FR 2006000284 W FR2006000284 W FR 2006000284W WO 2006084994 A1 WO2006084994 A1 WO 2006084994A1
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WO
WIPO (PCT)
Prior art keywords
threaded portion
length
osteosynthesis
spindle
smooth
Prior art date
Application number
PCT/FR2006/000284
Other languages
French (fr)
Inventor
Bertrand Fritsch
Jean-Jacques Martin
Original Assignee
Small Bone Innovations International
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 Small Bone Innovations International filed Critical Small Bone Innovations International
Publication of WO2006084994A1 publication Critical patent/WO2006084994A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Pins or screws or threaded wires; nuts therefor
    • A61B17/8625Shanks, i.e. parts contacting bone tissue
    • A61B17/863Shanks, 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 an osteosynthesis material.
  • osteosynthesis equipment adapted to treat different kinds of bone, including materials including plates and screws.
  • the essential objective of the present invention is to remedy this deficiency.
  • the osteosynthesis material it concerns comprises at least one pin which has:
  • first threaded portion at a first end, a first threaded portion, of outside diameter greater than that of the spindle; a first smooth portion, subsequent to this first threaded portion, having a length less than the distance that can separate two bone fragments to be osteosynthesized, in particular of the order of 10 mm for a pin intended for osteosynthesis of small bones such as those of the hand, wrist or foot; a second threaded portion, consecutive to said first smooth portion, having an outer diameter greater than that of the spindle but less than that of said first threaded portion, and having a thread with the same direction as that of the first threaded portion but of not lower, and
  • the pin according to the invention is intended to be inserted, at its second end, through a proximal fragment of the bone to be treated and through a distal fragment of this bone, and then to be slid through these fragments until said second end is accessible to a driving mandrel of the rotating spindle, for example a type mandrel
  • said second threaded portion has a length significantly greater than that of said first threaded portion, in particular from two to five times greater.
  • the spindle is thus adaptable to the treatment of different bones, in particular for the treatment of inter-condylar or metaphyseal fractures of the phalanges and metacarpals, of articular or sub-articular fractures of carp or tarsal bones.
  • said second end of the spindle is self-piercing.
  • the pin can thus be inserted into the bone by being rotated appropriately, in particular by means of a "Jacob” type mandrel.
  • This second end may in particular be shaped as a point with three or four faces, these faces having an inclination of the order of 30 degrees relative to the longitudinal axis of the spindle, in the same way as a "trocar tip" classic .
  • said first smooth portion has a length of the order of 2.5 times the length of said first threaded portion
  • said second threaded portion has a length of the order of 4 times the length of this first threaded portion.
  • each pin has the following dimensions:
  • the thread of at least one threaded portion may comprise an anterior flank inclined at an angle of the order of 30 degrees, an end flank parallel to the longitudinal axis of the spindle and a rounded posterior flank with a radius of curvature of the order of 0.15 mm.
  • Figure 1 is a view of a pin that includes this material
  • Figure 2 is a partial view of this pin, on an enlarged scale
  • Figure 3 is a greatly enlarged scale view, in section, of a first threaded portion that includes this pin
  • Figure 4 is a view similar to Figure 3 of a second threaded portion that includes this pin
  • Figure 5 is a partial view of a mandrel of "Jacob" in which is engaged the spindle and a fractured scaphoid bone, to be subject to osteosynthesis
  • FIGS. 6 to 8 are views similar to FIG. 5, in the course of three following stages of use of the material according to the invention
  • FIG. 9 is a perspective view, from another angle and on an enlarged scale, of the os after setting up three pins.
  • Figure 1 shows an osteosynthesis pin 1 more particularly for osteosynthesis of reduced dimensions of bone, including the bones of the hand, wrist or foot.
  • This pin 1 can in particular be used for the treatment of inter-condylar or metaphyseal fractures of the phalanges and metacarpals, or for the treatment of articular or sub-articular fractures of carp or tarsal bones.
  • pin 1 presents:
  • a first threaded portion 3 At a first end 2, a first threaded portion 3, outer diameter greater than that of the pin 1; a first smooth portion 4, consecutive to this first threaded portion 3, having a length less than the distance that can separate two bone fragments to be osteosynthesized;
  • a second threaded portion 5 consecutive to said first smooth portion 4, having an outer diameter greater than that of the spindle 1 but smaller than that of said first threaded portion 3, and having a thread of the same direction as that of the first portion; threaded 3 but of inferior pitch, and
  • Said second threaded portion 5 has a length significantly greater than that of said first threaded portion 3.
  • the second end 7 of the spindle 1 is shaped like a four-sided point, these faces having an inclination of about 30 degrees with respect to the longitudinal axis of the spindle 1, in the same way as a classic "trocar tip".
  • pin 1 has the following dimensions:
  • Figures 3 and 4 show more particularly the shape of the net portions 3 and 5 respectively.
  • the net comprises an anterior flank 8a inclined at an angle of 30 degrees, an end flank 8b parallel to the longitudinal axis of the spindle 1, and a rounded rear flank 8c of radius of curvature of 0.15 mm.
  • the pitch of the portion 3 fillet is 0.6 mm, while it is 0.5 mm for portion 5.
  • Figures 5 to 8 show the case of osteosynthesis of a fractured scaphoid 100 into a proximal fragment 101 and a distal fragment 102.
  • the spindle 1 is first put in place in a mandrel 10 of the "Jacob" type, with its end 2 inside this mandrel 10.
  • the spindle 1 is then rotated by means of this mandrel 10 (FIG. 5) and is inserted, by its second end 7, dorsal side of the hand, through the proximal fragment 101 ( Figure 6) and through the distal fragment 102.
  • the pin 1 is then slid through these fragments 101, 102 until said second end 7 comes out of the palmar side and is accessible to the mandrel 10.
  • FIG. 9 shows that, if necessary, several pins 1 are placed in the bone 100 and are cut in the aforementioned manner, so as to ensure perfect immobilization of the fragments 101, 102 relative to each other .
  • the invention provides osteosynthesis material having the decisive advantage of being perfectly adapted bone treatment of small dimensions, especially the bones of the hand, wrist or foot.

Abstract

The invention concerns an equipment comprising at least one pin (1) having: at a first end (2) a first threaded portion (3), with an outer diameter greater than that of the pin (1); a first smooth portion (4), following said first threaded portion (3), having a length less than the distance separating two bone fragments (101, 102) to undergo osteosynthesis, in particular of the order of 10 mm for a pin (1) for osteosynthesis of bones of reduced dimensions such as those of the hands, the wrist or the foot; a second threaded portion (5), following said first smooth portion (4), having an outer diameter greater than that of the pin (1) but less than that of said first threaded portion (3), and having a thread of same direction as that of the first threaded portion (3) but of smaller pitch; and a second smooth portion (6) extending up to the second end (7) of the spindle (1).

Description

MATERIEL D'OSTEOSYNTHESE OSTEOSYNTHESIS EQUIPMENT
La présente invention concerne un matériel d'ostéosynthèse. Il existe de nombreux types de matériel d'ostéosynthèse, adaptés pour traiter différentes sortes d'os, notamment des matériels incluant des plaques et des vis.The present invention relates to an osteosynthesis material. There are many types of osteosynthesis equipment, adapted to treat different kinds of bone, including materials including plates and screws.
Il n'existe cependant pas de matériels parfaitement adaptés au traitement d'os des dimensions réduites, notamment les os de la main, du poignet ou du pied.There is, however, no material perfectly suited to the treatment of small bones, including the bones of the hand, wrist or foot.
L'objectif essentiel de Ia présente invention est de remédier à cette lacune.The essential objective of the present invention is to remedy this deficiency.
À cet effet, le matériel d'ostéosynthèse qu'elle concerne comprend au moins une broche qui présente :For this purpose, the osteosynthesis material it concerns comprises at least one pin which has:
- à une première extrémité, une première portion filetée, de diamètre extérieur supérieur à celui de la broche ; - une première portion lisse, consécutive à cette première portion filetée, ayant une longueur inférieure à la distance pouvant séparer deux fragments d'os devant faire l'objet de l'ostéosynthèse, notamment de l'ordre de 10 mm pour une broche destinée à l'ostéosynthèse d'os de dimensions réduites tels que ceux de la main, du poignet ou du pied ; - une deuxième portion filetée, consécutive à ladite première portion lisse, ayant un diamètre extérieur supérieur à celui de la broche mais inférieur à celui de ladite première portion filetée, et ayant un filet de même sens que celui de la première portion filetée mais de pas inférieur, etat a first end, a first threaded portion, of outside diameter greater than that of the spindle; a first smooth portion, subsequent to this first threaded portion, having a length less than the distance that can separate two bone fragments to be osteosynthesized, in particular of the order of 10 mm for a pin intended for osteosynthesis of small bones such as those of the hand, wrist or foot; a second threaded portion, consecutive to said first smooth portion, having an outer diameter greater than that of the spindle but less than that of said first threaded portion, and having a thread with the same direction as that of the first threaded portion but of not lower, and
- une deuxième portion lisse, allant jusqu'à la deuxième extrémité de la broche.- A second smooth portion up to the second end of the spindle.
La broche selon invention est destinée à être insérée, par sa deuxième extrémité, au travers d'un fragment proximal de l'os à traiter et au travers d'un fragment distal de cet os, puis à être coulissée au travers de ces fragments jusqu'à ce que ladite deuxième extrémité soit accessible à un mandrin d'entraînement de la broche en rotation, par exemple un mandrin de typeThe pin according to the invention is intended to be inserted, at its second end, through a proximal fragment of the bone to be treated and through a distal fragment of this bone, and then to be slid through these fragments until said second end is accessible to a driving mandrel of the rotating spindle, for example a type mandrel
"Jacob". La broche est alors entraînée en rotation au moyen de ce mandrin dans le sens du vissage desdites portions filetées, ce qui amène ladite deuxième portion filetée à traverser le fragment proximal puis à se visser dans le fragment distal, et ladite première portion filetée à se visser dans le fragment proximal. Compte tenu de la longueur précitée de ladite première portion lisse, inférieure à la distance séparant les deux fragments d'os, ces vissages se font simultanément dans les deux fragments respectifs ; du fait que le pas de ladite deuxième portion filetée est inférieur au pas de ladite première portion filetée, ces vissages simultanés amènent à un rapprochement des deux fragments d'os l'un par rapport à l'autre puis à une venue en appui de ces deux fragments l'un contre l'autre, réalisant l'ostéosynthèse."Jacob." The spindle is then rotated by means of this mandrel in the screwing direction of said threaded portions, which causes said second threaded portion to pass through the proximal fragment and then screw into the distal fragment, and said first threaded portion to be screwed in the proximal fragment. Given the aforementioned length of said first smooth portion, less than the distance separating the two bone fragments, these screwings occur simultaneously in the two respective fragments; since the pitch of said second threaded portion is smaller than the pitch of said first threaded portion, these simultaneous screwing lead to a bringing together of the two bone fragments with respect to each other and then to a bearing in support of these two fragments against each other, performing the osteosynthesis.
Une fois cette ostéosynthèse réalisée, la partie de la broche dépassant de l'os du côté distal est sectionnée. De préférence, ladite deuxième portion filetée présente une longueur nettement supérieure à celle de la dite première portion filetée, notamment de deux à cinq fois supérieure.Once this osteosynthesis is performed, the part of the pin protruding from the bone on the distal side is severed. Preferably, said second threaded portion has a length significantly greater than that of said first threaded portion, in particular from two to five times greater.
Cette longueur importante de ladite deuxième portion filetée permet de s'assurer que cette deuxième portion filetée est toujours en prise avec le fragment distal lorsque ladite première portion filetée vient se visser dans le fragment proximal. La broche est ainsi adaptable au traitement d'os différents, notamment pour le traitement de fractures inter-condyliennes ou métaphysaires des phalanges et des métacarpiens, de fractures articulaires ou sous-articulaires des os du carpe ou du tarse. De préférence, ladite deuxième extrémité de la broche est auto- perforante.This large length of said second threaded portion makes it possible to ensure that this second threaded portion is always in engagement with the distal fragment when said first threaded portion is screwed into the proximal fragment. The spindle is thus adaptable to the treatment of different bones, in particular for the treatment of inter-condylar or metaphyseal fractures of the phalanges and metacarpals, of articular or sub-articular fractures of carp or tarsal bones. Preferably, said second end of the spindle is self-piercing.
La broche peut ainsi être insérée dans l'os en étant entraînée en rotation de manière appropriée, notamment au moyen d'un mandrin de type "Jacob".The pin can thus be inserted into the bone by being rotated appropriately, in particular by means of a "Jacob" type mandrel.
Cette deuxième extrémité peut notamment être conformée en pointe à trois ou quatre faces, ces faces ayant une inclinaison de l'ordre de 30 degrés par rapport à l'axe longitudinal de la broche, de la même manière qu'une "pointe trocart" classique.This second end may in particular be shaped as a point with three or four faces, these faces having an inclination of the order of 30 degrees relative to the longitudinal axis of the spindle, in the same way as a "trocar tip" classic .
De préférence, ladite première portion lisse présente une longueur de l'ordre de 2,5 fois la longueur de ladite première portion filetée, et ladite deuxième portion filetée présente une longueur de l'ordre de 4 fois la longueur de cette première portion filetée.Preferably, said first smooth portion has a length of the order of 2.5 times the length of said first threaded portion, and said second threaded portion has a length of the order of 4 times the length of this first threaded portion.
Selon une forme de réalisation préférée de l'invention, chaque broche a les dimensions suivantes :According to a preferred embodiment of the invention, each pin has the following dimensions:
- diamètre au niveau des portions lisses : 1 ,2 mm ; - diamètre externe au niveau de ladite deuxième portion filetée : 1 ,4 mm ; - diamètre externe au niveau de ladite première portion filetée : 1 ,6 mm ;- diameter at the level of the smooth portions: 1, 2 mm; outer diameter at said second threaded portion: 1.4 mm; outer diameter at said first threaded portion: 1.6 mm;
- longueur de ladite première portion filetée : 4 mm ;length of said first threaded portion: 4 mm;
- longueur de ladite première portion lisse : 10 mm ;length of said first smooth portion: 10 mm;
- longueur de ladite deuxième portion filetée : 15 mm ; - longueur de ladite deuxième portion lisse : 120 mm.length of said second threaded portion: 15 mm; - Length of said second smooth portion: 120 mm.
Le filet d'au moins une portion filetée peut comprendre un flanc antérieur incliné d'un angle de l'ordre de 30 degrés, un flanc d'extrémité parallèle à l'axe longitudinal de la broche et un flanc postérieur arrondi, de rayon de courbure de l'ordre de 0,15 mm. L'invention sera bien comprise, et d'autres caractéristiques et avantages de celle-ci apparaîtront, en référence au dessin schématique annexé, représentant, à titre d'exemple non limitatif, une forme de réalisation préférée du matériel d'ostéosynthèse qu'elle concerne.The thread of at least one threaded portion may comprise an anterior flank inclined at an angle of the order of 30 degrees, an end flank parallel to the longitudinal axis of the spindle and a rounded posterior flank with a radius of curvature of the order of 0.15 mm. The invention will be better understood, and other features and advantages thereof will appear, with reference to the appended schematic drawing, showing, by way of non-limiting example, a preferred embodiment of the osteosynthesis material that it concerned.
La figure 1 est une vue d'une broche que comprend ce matériel ; la figure 2 est une vue partielle de cette broche, à échelle agrandie ; la figure 3 est une vue à échelle nettement agrandie, en coupe, d'une première portion filetée que comprend cette broche ; la figure 4 est une vue similaire à la figure 3 d'une deuxième portion filetée que comprend cette broche ; la figure 5 est une vue partielle d'un mandrin de "Jacob" dans lequel est engagé la broche et d'un os du scaphoïde fracturé, devant faire l'objet d'une ostéosynthèse ; les figures 6 à 8 sont des vues similaires à la figure 5, au cours de trois étapes suivantes d'utilisation du matériel selon invention, et la figure 9 est une vue en perspective, sous un autre angle et à échelle agrandie, de l'os après mise en place de trois broches.Figure 1 is a view of a pin that includes this material; Figure 2 is a partial view of this pin, on an enlarged scale; Figure 3 is a greatly enlarged scale view, in section, of a first threaded portion that includes this pin; Figure 4 is a view similar to Figure 3 of a second threaded portion that includes this pin; Figure 5 is a partial view of a mandrel of "Jacob" in which is engaged the spindle and a fractured scaphoid bone, to be subject to osteosynthesis; FIGS. 6 to 8 are views similar to FIG. 5, in the course of three following stages of use of the material according to the invention, and FIG. 9 is a perspective view, from another angle and on an enlarged scale, of the os after setting up three pins.
La figure 1 représente une broche d'ostéosynthèse 1 plus particulièrement destinée à l'ostéosynthèse d'os des dimensions réduites, notamment les os de la main, du poignet ou du pied. Cette broche 1 peut notamment être utilisée pour le traitement de fractures inter-condyliennes ou métaphysaires des phalanges et des métacarpiens, ou pour le traitement de fractures articulaires ou sous-articulaires des os du carpe ou du tarse.Figure 1 shows an osteosynthesis pin 1 more particularly for osteosynthesis of reduced dimensions of bone, including the bones of the hand, wrist or foot. This pin 1 can in particular be used for the treatment of inter-condylar or metaphyseal fractures of the phalanges and metacarpals, or for the treatment of articular or sub-articular fractures of carp or tarsal bones.
Comme le montre plus particulièrement la figure 2, la broche 1 présente :As shown more particularly in Figure 2, pin 1 presents:
- à une première extrémité 2, une première portion filetée 3, de diamètre extérieur supérieur à celui de la broche 1 ; - une première portion lisse 4, consécutive à cette première portion filetée 3, ayant une longueur inférieure à la distance pouvant séparer deux fragments d'os devant faire l'objet de l'ostéosynthèse ;- At a first end 2, a first threaded portion 3, outer diameter greater than that of the pin 1; a first smooth portion 4, consecutive to this first threaded portion 3, having a length less than the distance that can separate two bone fragments to be osteosynthesized;
- une deuxième portion filetée 5, consécutive à ladite première portion lisse 4, ayant un diamètre extérieur supérieur à celui de la broche 1 mais inférieur à celui de ladite première portion filetée 3, et ayant un filet de même sens que celui de la première portion filetée 3 mais de pas inférieur, eta second threaded portion 5, consecutive to said first smooth portion 4, having an outer diameter greater than that of the spindle 1 but smaller than that of said first threaded portion 3, and having a thread of the same direction as that of the first portion; threaded 3 but of inferior pitch, and
- une deuxième portion lisse 6, allant jusqu'à la deuxième extrémité 7 de la broche 1. Ladite deuxième portion filetée 5 présente une longueur nettement supérieure à celle de la dite première portion filetée 3.- A second smooth portion 6, up to the second end 7 of the spindle 1. Said second threaded portion 5 has a length significantly greater than that of said first threaded portion 3.
Comme cela apparaît sur les figures 1 et 5, la deuxième extrémité 7 de la broche 1 est conformée en pointe à quatre faces, ces faces ayant une inclinaison de l'ordre de 30 degrés par rapport à l'axe longitudinal de la broche 1 , de la même manière qu'une "pointe trocart" classique.As can be seen in FIGS. 1 and 5, the second end 7 of the spindle 1 is shaped like a four-sided point, these faces having an inclination of about 30 degrees with respect to the longitudinal axis of the spindle 1, in the same way as a classic "trocar tip".
Dans l'exemple représenté, la broche 1 a les dimensions suivantes :In the example shown, pin 1 has the following dimensions:
- diamètre au niveau des portions lisses 4, 6 : 1 ,2 mm ;diameter at smooth portions 4, 6: 1, 2 mm;
- diamètre externe au niveau de ladite deuxième portion filetée 5 : 1 ,4 mm ; - diamètre externe au niveau de ladite première portion filetée 3 :- outer diameter at said second threaded portion 5: 1, 4 mm; - outer diameter at said first threaded portion 3:
1 ,6 mm ;1.6 mm;
- longueur de ladite première portion filetée 3 : 4 mm ;length of said first threaded portion 3: 4 mm;
- longueur de ladite première portion lisse 4 : 10 mm ;length of said first smooth portion 4: 10 mm;
- longueur de ladite deuxième portion filetée 5 : 15 mm ; - longueur de ladite deuxième portion lisse 6 : 120 mm.length of said second threaded portion 5: 15 mm; - Length of said second smooth portion 6: 120 mm.
Les figures 3 et 4 montrent plus particulièrement la forme du filet des portions 3 et 5 respectivement. Dans les deux cas, le filet comprend un flanc antérieur 8a incliné d'un angle de 30 degrés, un flanc d'extrémité 8b parallèle à l'axe longitudinal de la broche 1 , et un flanc postérieur arrondi 8c, de rayon de courbure de 0,15 mm.Figures 3 and 4 show more particularly the shape of the net portions 3 and 5 respectively. In both cases, the net comprises an anterior flank 8a inclined at an angle of 30 degrees, an end flank 8b parallel to the longitudinal axis of the spindle 1, and a rounded rear flank 8c of radius of curvature of 0.15 mm.
Le pas du filet de la portion 3 est de 0,6 mm, tandis que qu'il est de 0,5 mm s'agissant de la portion 5.The pitch of the portion 3 fillet is 0.6 mm, while it is 0.5 mm for portion 5.
La hauteur du filet est de 0,2 mm s'agissant de la portion 3 et de 0,15 mm s'agissant de la portion 5. Les figures 5 à 8 montrent le cas de l'ostéosynthèse d'un scaphoïde 100 fracturé en un fragment proximal 101 et un fragment distal 102.Net height is 0.2 mm for Portion 3 and 0.15 mm for Portion 5. Figures 5 to 8 show the case of osteosynthesis of a fractured scaphoid 100 into a proximal fragment 101 and a distal fragment 102.
La broche 1 est tout d'abord mise en place dans un mandrin 10 de type "Jacob", avec son extrémité 2 à l'intérieur de ce mandrin 10. La broche 1 est ensuite entraînée en rotation au moyen de ce mandrin 10 (figure 5) puis est insérée, par sa deuxième extrémité 7, coté dorsal de la main, au travers du fragment proximal 101 (figure 6) et au travers du fragment distal 102. La broche 1 est alors coulissée au travers de ces fragments 101 , 102 jusqu'à ce que ladite deuxième extrémité 7 ressorte du côté palmaire et soit accessible au mandrin 10.The spindle 1 is first put in place in a mandrel 10 of the "Jacob" type, with its end 2 inside this mandrel 10. The spindle 1 is then rotated by means of this mandrel 10 (FIG. 5) and is inserted, by its second end 7, dorsal side of the hand, through the proximal fragment 101 (Figure 6) and through the distal fragment 102. The pin 1 is then slid through these fragments 101, 102 until said second end 7 comes out of the palmar side and is accessible to the mandrel 10.
Le mandrin 10 est alors mis en place sur cette extrémité distale dépassante de la broche 1 et est serré sur celle-ci, puis la broche 1 est entraînée en rotation au moyen de ce mandrin 10 dans le sens du vissage desdites portions filetées 3 et 5 (figure 7). Cet entraînement en rotation amène ladite deuxième portion filetée 5 à traverser le fragment proximal 101 puis à se visser dans le fragment distal 102, et amène ladite première portion filetée 3 à se visser dans le fragment proximal 101. Compte tenu de la longueur précitée de ladite première portion lisse 4, inférieure à la distance séparant les deux fragments 101 , 102, ces vissages se font simultanément dans les deux fragments respectifs ; du fait que le pas de ladite deuxième portion filetée 5 est inférieur au pas de ladite première portion filetée 3, ces vissages simultanés amènent à un rapprochement des deux fragments d'os 101 , 102 l'un par rapport à l'autre puis à une venue en appui de ces deux fragments l'un contre l'autre, réalisant l'ostéosynthèse (figure 8). La longueur importante de la portion filetée 5 permet de s'assurer que cette portion filetée 5 est toujours en prise avec le fragment distal 102 lorsque la portion filetée 3 vient se visser dans le fragment proximal 101.The mandrel 10 is then put in place on this distal end protruding from the pin 1 and is clamped on it, then the pin 1 is rotated by means of this mandrel 10 in the screwing direction of said threaded portions 3 and 5. (Figure 7). This rotation drive causes said second threaded portion 5 to pass through the proximal fragment 101 and then to screw into the distal fragment 102, and causes said first threaded portion 3 to screw into the proximal fragment 101. Given the aforementioned length of said first smooth portion 4, less than the distance between the two fragments 101, 102, these screwings are simultaneously in the two respective fragments; since the pitch of said second threaded portion 5 is smaller than the pitch of said first threaded portion 3, these simultaneous screwings bring the two bone fragments 101, 102 closer to one another and then to one another. came in support of these two fragments against each other, performing the osteosynthesis (Figure 8). The large length of the threaded portion 5 ensures that this threaded portion 5 is still engaged with the distal fragment 102 when the threaded portion 3 is screwed into the proximal fragment 101.
Une fois l'ostéosynthèse réalisée, la partie de la broche 1 dépassant de l'os 100 du côté distal est sectionnée. La figure 9 montre que, si nécessaire, plusieurs broches 1 sont mises en place dans l'os 100 et sont sectionnées de la manière précitée, de manière à assurer une parfaite immobilisation des fragments 101 , 102 l'un par rapport à l'autre.Once osteosynthesis has been performed, the part of pin 1 protruding from bone 100 on the distal side is severed. FIG. 9 shows that, if necessary, several pins 1 are placed in the bone 100 and are cut in the aforementioned manner, so as to ensure perfect immobilization of the fragments 101, 102 relative to each other .
Comme cela apparaît de ce qui précède, l'invention fournit un matériel d'ostéosynthèse présentant l'avantage déterminant d'être parfaitement adapté au traitement d'os des dimensions réduites, notamment les os de la main, du poignet ou du pied.As appears from the foregoing, the invention provides osteosynthesis material having the decisive advantage of being perfectly adapted bone treatment of small dimensions, especially the bones of the hand, wrist or foot.
Il va de soi que l'invention n'est pas limitée à la forme de réalisation décrite ci-dessus à titre d'exemple mais qu'elle s'étend à toutes les formes de réalisations couvertes par les revendications ci-annexées. It goes without saying that the invention is not limited to the embodiment described above by way of example but that it extends to all embodiments covered by the appended claims.

Claims

REVENDICATIONS
1 - Matériel d'ostéosynthèse caractérisé en ce qu'il comprend au moins une broche (1) qui présente :1 - Osteosynthesis equipment characterized in that it comprises at least one pin (1) which has:
- à une première extrémité (2), une première portion filetée (3), de diamètre extérieur supérieur à celui de la broche (1) ;- At a first end (2), a first threaded portion (3) of outer diameter greater than that of the spindle (1);
- une première portion lisse (4), consécutive à cette première portion filetée (3), ayant une longueur inférieure à la distance pouvant séparer deux fragments d'os (101 , 102) devant faire l'objet de l'ostéosynthèse, notamment de l'ordre de 10 mm pour une broche (1) destinée à l'ostéosynthèse d'os de dimensions réduites tels que ceux de la main, du poignet ou du pied ;a first smooth portion (4), consecutive to this first threaded portion (3), having a length less than the distance that can separate two bone fragments (101, 102) to be osteosynthetically the order of 10 mm for a pin (1) for the osteosynthesis of small bones such as those of the hand, wrist or foot;
- une deuxième portion filetée (5), consécutive à ladite première portion lisse (4), ayant un diamètre extérieur supérieur à celui de la broche (1) mais inférieur à celui de ladite première portion filetée (3), et ayant un filet de même sens que celui de la première portion filetée (3) mais de pas inférieur, et - une deuxième portion lisse (6), allant jusqu'à la deuxième extrémité (7) de la broche (1).a second threaded portion (5), consecutive to said first smooth portion (4), having an outside diameter greater than that of the spindle (1) but smaller than that of said first threaded portion (3), and having a thread of same direction as that of the first threaded portion (3) but of lower pitch, and - a second smooth portion (6), up to the second end (7) of the spindle (1).
2 - Matériel d'ostéosynthèse selon la revendication 1 , caractérisé en ce que ladite deuxième portion filetée (5) présente une longueur nettement supérieure à celle de ladite première portion filetée (3), notamment de deux à cinq fois supérieure.2 - osteosynthesis equipment according to claim 1, characterized in that said second threaded portion (5) has a length significantly greater than that of said first threaded portion (3), in particular from two to five times greater.
3 - Matériel d'ostéosynthèse selon la revendication 1 ou la revendication 2, caractérisé en ce que ladite deuxième extrémité (7) de la broche (1) est auto-perforante.3 - osteosynthesis material according to claim 1 or claim 2, characterized in that said second end (7) of the spindle (1) is self-piercing.
4 - Matériel d'ostéosynthèse selon la revendication 3, caractérisé en ce que ladite deuxième extrémité (7) est conformée en pointe à trois ou quatre faces, ces faces ayant une inclinaison de l'ordre de 30 degrés par rapport à l'axe longitudinal de la broche (1).4 - Osteosynthesis equipment according to claim 3, characterized in that said second end (7) is shaped as a point with three or four sides, these faces having an inclination of about 30 degrees relative to the longitudinal axis the spindle (1).
5 - Matériel d'ostéosynthèse selon l'une des revendications 1 à 4, caractérisé en ce que ladite première portion lisse (4) présente une longueur de l'ordre de 2,5 fois la longueur de ladite première portion filetée (3), et en ce que ladite deuxième portion filetée (5) présente une longueur de l'ordre de 4 fois la longueur de cette première portion filetée (3).5 - Osteosynthesis equipment according to one of claims 1 to 4, characterized in that said first smooth portion (4) has a length of the order of 2.5 times the length of said first threaded portion (3), and in that said second threaded portion (5) has a length of the order of 4 times the length of this first threaded portion (3).
6 - Matériel d'ostéosynthèse selon l'une des revendications 1 à 5, caractérisé en ce que chaque broche (1) a les dimensions suivantes : - diamètre au niveau des portions lisses (4, 6) : 1 ,2 mm ; - diamètre externe au niveau de ladite deuxième portion filetée (5) : 1 ,4 mm ;6 - osteosynthesis equipment according to one of claims 1 to 5, characterized in that each pin (1) has the following dimensions: - diameter at smooth portions (4, 6): 1, 2 mm; - outer diameter at said second threaded portion (5): 1.4 mm;
- diamètre externe au niveau de ladite première portion filetée (3) : 1 ,6 mm ; - longueur de ladite première portion filetée (3) : 4 mm ;- outer diameter at said first threaded portion (3): 1, 6 mm; length of said first threaded portion (3): 4 mm;
- longueur de ladite première portion lisse (4) : 10 mm ;length of said first smooth portion (4): 10 mm;
- longueur de ladite deuxième portion filetée (5) : 15 mm ;- length of said second threaded portion (5): 15 mm;
- longueur de ladite deuxième portion lisse (6) : 120 mm.- Length of said second smooth portion (6): 120 mm.
7 - Matériel d'ostéosynthèse selon l'une des revendications 1 à 6, caractérisé en ce que le filet d'au moins une portion filetée (3, 5) comprend un flanc antérieur (8a) incliné d'un angle de l'ordre de 30 degrés, un flanc d'extrémité (8b) parallèle à l'axe longitudinal de la broche (1) et un flanc postérieur arrondi (8c), de rayon de courbure de l'ordre de 0,15 mm.7 - Osteosynthesis equipment according to one of claims 1 to 6, characterized in that the thread of at least one threaded portion (3, 5) comprises an anterior flank (8a) inclined at an angle of the order 30 degrees, an end flank (8b) parallel to the longitudinal axis of the spindle (1) and a rounded rear flank (8c), of radius of curvature of the order of 0.15 mm.
8 - Matériel d'ostéosynthèse selon l'une des revendications 1 à 7, caractérisé en ce que le pas du filet de ladite première portion filetée (3) est de8 - Osteosynthesis equipment according to one of claims 1 to 7, characterized in that the thread pitch of said first threaded portion (3) is
0,6 mm.0.6 mm.
9 - Matériel d'ostéosynthèse selon l'une des revendications 1 à 8, caractérisé en ce que le pas du filet de ladite deuxième portion filetée (5) est de 0,5 mm. 10 - Matériel d'ostéosynthèse selon l'une des revendications 1 à 9, caractérisé en ce qu'il comprend un mandrin (10) du type "mandrin de Jacob". 9 - osteosynthesis equipment according to one of claims 1 to 8, characterized in that the thread pitch of said second threaded portion (5) is 0.5 mm. 10 - Osteosynthesis material according to one of claims 1 to 9, characterized in that it comprises a mandrel (10) of the type "Jacob's mandrel".
PCT/FR2006/000284 2005-02-14 2006-02-08 Osteosynthesis equipment WO2006084994A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0501461A FR2881942B1 (en) 2005-02-14 2005-02-14 OSTEOSYNTHESIS EQUIPMENT
FR0501461 2005-02-14

Publications (1)

Publication Number Publication Date
WO2006084994A1 true WO2006084994A1 (en) 2006-08-17

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WO (1) WO2006084994A1 (en)

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Publication number Priority date Publication date Assignee Title
US9138219B2 (en) 2010-12-29 2015-09-22 Tarsus Medical Inc. Methods and devices for treating a syndesmosis injury

Families Citing this family (1)

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DE202007005829U1 (en) * 2007-04-20 2007-07-12 Zrinski Ag Compression screw with wire element e.g. for mechanical connection of bone fractures, has longitudinal extending aligned shank which is divided into two parts, having thread

Citations (6)

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US5709687A (en) * 1994-03-16 1998-01-20 Pennig; Dietmar Fixation pin for small-bone fragments
US6261292B1 (en) * 1999-02-02 2001-07-17 European Foot Platform Threaded pin
FR2808182A1 (en) * 2000-04-28 2001-11-02 Newdeal Sa Surgical compression screw for joining two bones together has two threaded portions with different pitches, diameters and angles
FR2840799A1 (en) * 2002-06-17 2003-12-19 Fixano Osteosynthesis screw comprises axial bore and distal machine notches in wall delimiting two radial faces forming cutting edges with bore, external skin surfaces together with cutting edges enable screw to be self-tapping
WO2004107999A2 (en) * 2003-05-30 2004-12-16 Xavier Renard Screw comprising two threads with different pitches, used to join two bone segments
WO2005018684A2 (en) * 2003-08-11 2005-03-03 Depuy Spine, Inc. Distraction screw

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5709687A (en) * 1994-03-16 1998-01-20 Pennig; Dietmar Fixation pin for small-bone fragments
US6261292B1 (en) * 1999-02-02 2001-07-17 European Foot Platform Threaded pin
FR2808182A1 (en) * 2000-04-28 2001-11-02 Newdeal Sa Surgical compression screw for joining two bones together has two threaded portions with different pitches, diameters and angles
FR2840799A1 (en) * 2002-06-17 2003-12-19 Fixano Osteosynthesis screw comprises axial bore and distal machine notches in wall delimiting two radial faces forming cutting edges with bore, external skin surfaces together with cutting edges enable screw to be self-tapping
WO2004107999A2 (en) * 2003-05-30 2004-12-16 Xavier Renard Screw comprising two threads with different pitches, used to join two bone segments
WO2005018684A2 (en) * 2003-08-11 2005-03-03 Depuy Spine, Inc. Distraction screw

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9138219B2 (en) 2010-12-29 2015-09-22 Tarsus Medical Inc. Methods and devices for treating a syndesmosis injury

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FR2881942A1 (en) 2006-08-18
FR2881942B1 (en) 2007-04-06

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