WO2017198553A1 - Orthopaedic screwdriver with automatic locking - Google Patents

Orthopaedic screwdriver with automatic locking Download PDF

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Publication number
WO2017198553A1
WO2017198553A1 PCT/EP2017/061404 EP2017061404W WO2017198553A1 WO 2017198553 A1 WO2017198553 A1 WO 2017198553A1 EP 2017061404 W EP2017061404 W EP 2017061404W WO 2017198553 A1 WO2017198553 A1 WO 2017198553A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide tube
locking
self
screwdriver according
rotation
Prior art date
Application number
PCT/EP2017/061404
Other languages
French (fr)
Inventor
Brice KRIER
Yannick PONTOIS
Original Assignee
Clariance
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 Clariance filed Critical Clariance
Priority to JP2018561055A priority Critical patent/JP7160687B2/en
Priority to EP17722052.2A priority patent/EP3457962A1/en
Publication of WO2017198553A1 publication Critical patent/WO2017198553A1/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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7076—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation
    • A61B17/7082—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation for driving, i.e. rotating, screws or screw parts specially adapted for spinal fixation, e.g. for driving polyaxial or tulip-headed 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7076—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation
    • A61B17/7077—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation for moving bone anchors attached to vertebrae, thereby displacing the vertebrae
    • A61B17/708—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation for moving bone anchors attached to vertebrae, thereby displacing the vertebrae with tubular extensions coaxially mounted on the bone anchors

Definitions

  • the present invention relates to an automatic locking screwdriver for the positioning, clamping and / or loosening of orthopedic implants anchored in the tissues of an individual's bone body.
  • European patent EP2962651 discloses removable screwdrivers for anchoring bone screws for orthopedic implant retention against a bone body and more particularly for spinal implant connector fixation.
  • the removable screwdriver has a coupling portion for driving a rod whose distal end portion cooperates with the head of the pedicle screw while said coupling portion is screwed inside the form of connector tulip for spinal implant.
  • This type of screwdriver must on the one hand hold the connector and on the other hand allow the rotation of the anchoring screw for fixing in the bone tissue.
  • the screwdriver according to the present invention aims to solve this problem by providing a locking system for temporarily locking said screwdriver on the implant the time of anchoring the fixation screw in the bone tissue.
  • the self-locking screwdriver comprising a guide tube inside which is guided and rotated a clamping rod whose one end is provided with a recess for driving in rotation and the tightening an anchoring screw for immobilizing an orthopedic implant against an osseous body of an individual, said screwdriver comprising firstly between the guide tube and the clamping rod a blocking system cooperating with said guide tube to prevent loosening of the latter of the orthopedic implant when tightening the anchor screw and secondly on the outer periphery of the guide tube a gripping wheel ensuring the locking and / or the unlocking the locking system and driving in rotation of said guide tube.
  • the self-locking screwdriver according to the present invention comprises a locking system which consists of a connecting rod comprising on its periphery a series of teeth cooperating as a function of the direction of rotation of said rod with a retractable stop arranged in the tube of guide.
  • the self-locking screwdriver according to the present invention comprises a retractable stop whose C-shaped profile has inside its opening an inclined profile.
  • the self-locking screwdriver according to the present invention comprises a retractable stop in which is arranged a flexible blade provided on its inner face directed inside said guide tube of a tooth.
  • the self-locking screwdriver comprises a retractable stop whose tooth has an arcuate profile which is arranged in the extension of the circular profile of the internal bore of the guide tube.
  • the self-locking screwdriver according to the present invention comprises a connecting rod comprising, in the extension of the teeth, a connecting device consisting on the one hand of a blind internal bore and on the other hand an arrangement of elastically deformable lamellae allowing receive and lock in translation and in rotation the clamping rod.
  • the self-locking screwdriver according to the present invention comprises opposite the retractable stopper of the guide tube a torque transmission stud.
  • the self-locking screwdriver comprises a gripping wheel having a first space within which the retractable stop cooperates and a second space disposed opposite the first and inside which is housed the transmission pad of couple.
  • the self-locking screwdriver comprises inside the first space of the gripping wheel a cam whose outer profile comes into contact with the inclined one of the opening of the retractable abutment.
  • the self-locking screwdriver according to the present invention comprises a second space, the internal profile of which delimits, in the vicinity of the external bore of the guide tube, a first abutment known as a "screw abutment” and, on the opposite side, a second abutment referred to as “ unscrewing stop "on which bears the torque transmission pad according to the direction of rotation of the gripping wheel around the guide tube.
  • a first abutment known as a "screw abutment”
  • unscrewing stop on which bears the torque transmission pad according to the direction of rotation of the gripping wheel around the guide tube.
  • Figure 3 is a sectional view showing the self-locking screwdriver according to the invention.
  • Figures 4 to 8 are views illustrating the guide tube of the self-locking screwdriver according to the invention.
  • Figures? and 8 are views showing the connecting rod locking means of the self-locking screwdriver according to the invention.
  • FIGS 9 and 10 are views showing the retractable stop of the locking means of the self-locking screwdriver according to the invention.
  • FIGS. 11 and 12 are sectional views illustrating the locking and unlocking positions of locking means of the self-locking screwdriver according to the invention.
  • FIGS. 1 to 3 show an automatic locking screwdriver 1 according to the present invention comprising a guide tube 3 and a clamping rod 4 which cooperate respectively with a U-shaped connector 2a and an anchoring screw 6 of FIG. an orthopedic implant 2, the anchoring screw 6 is provided to pass through the connector 2a so that its head 6a with a spherical profile bears against the bottom of the U-shaped profile of said connector 2a to ensure angular and positioning freedom to said connector by relative to the axis of implantation of said anchoring screw 6 in the body of a vertebra Ve.
  • the screwdriver 1 Due to the freedom of movement between the connector 2a and the anchoring screw 6, the screwdriver 1 must come to rest in said connector while allowing the rotation drive of the anchoring screw 6.
  • the self-locking screwdriver 1 comprises a guide tube 3 provided at one of its ends with a threaded external profile 3a cooperating with the internal threaded zone 2b of the connector 2a so as to immobilize said screwdriver 1 to the inside said connector 2a of the orthopedic implant 2.
  • the guide tube 3 comprises on its outer periphery a retractable stop 11 and in a diametrically opposite direction a transmission pad 12.
  • the retractable stop 11 has a C-shaped profile whose opening 11a is turned towards the threaded profile 3a.
  • the retractable stop 1 1 is obtained by machining the outer wall of the guide tube 3 delimiting a flexible blade 1 1b providing a certain freedom of movement to said stop with respect to the longitudinal axis of said tube.
  • the flexible blade 11b of the retractable abutment 11 has on its inner face and directed inside the internal bore 3b of the guide tube 3 a tooth 1 1c whose arcuate profile is arranged in the extension of the profile circular of said internal bore.
  • the retractable stop 1 1 and the transmission stud 12 cooperate with a gripping wheel 8 arranged around the guide tube 3 and allowing depending on its direction of rotation around said tube to move or not said stop.
  • the gripping wheel 8 comprises a first space 8a inside which cooperates the C-shaped profile of the retractable abutment 1 1. Inside the first space 8a is arranged a cam 15 whose outer profile comes into contact with the inclined one 11d of the opening 1 1a during the rotation of the gripping wheel 8 in order to move the tooth 11c closer to or closer to the retractable stop 1 1 of the central and longitudinal axis of the guide tube 3 (FIGS. 12).
  • the gripping wheel 8 comprises a second space 8b disposed opposite the first 8a and inside which is housed the torque transmission pad 12 arranged on the periphery of the guide tube 3.
  • the second space 8b has an internal profile for delimiting near the outer bore of the guide tube 3 a first abutment 13 called “screw abutment” and opposite a second abutment 14 called “abutment abutment” on which bears the pad 12 according to the direction of rotation of the grip wheel 8 around said guide tube.
  • the self-locking screwdriver 1 comprises between the guide tube 3 and the clamping rod 4 a connecting rod 9 for connecting said clamping rod to a holding handle 16.
  • the connecting rod 9 has at one of its ends and on its outer periphery a series of teeth 10 whose external profile is complementary to that of the tooth 1 1c of the retractable stop 11.
  • the connecting rod 9 comprises in the extension of the teeth 10 a connecting device 17 consisting on the one hand of a blind internal bore 17a and on the other hand an arrangement of elastically deformable strips 17b for receiving and locking in translation and rotation of the clamping rod 4.
  • the clamping rod 4 has, opposite its connection with the connecting rod 9, an external cavity 5 cooperating with the internal cavity formed in the head 6a of the anchoring screw 6 to allow the rotary drive of this last when the guide tube 3 is immobilized on the connector 2a.
  • the gripping handle 8 is driven in a clockwise rotation around the guide tube 3 in order to position the torque transmission pad 12 against the first abutment 13 called “screw stop" so that the torque is transmitted by said stud 12 to the guide tube 3;
  • the clamping rod 4 is rotated by means of the handle 16 and the connecting rod 9 in order to screw the anchor screw 6 in the body of the vertebra Ve to fix the implant 2.
  • the locking system of the screwdriver 1 can be unlocked to allow the unscrewing of the guide tube 3 of the connector 2a of the implant 2 after its anchoring in the bone body by means of the anchoring screw 6 .
  • Unlocking of the locking system is effected by a counterclockwise movement of the gripping wheel 8 around the guide tube 3.

Abstract

The screwdriver (1) with automatic locking comprises a guide tube (3) inside which a tightening rod (4) is guided and driven in rotation, one of the ends of the tightening rod (4) being provided with a socket (5) allowing an anchoring screw (6) to be driven in rotation and tightened, which screw immobilizes an orthopaedic implant (2) against an osseous body of an individual, said screwdriver having, between the guide tube (3) and the tightening rod (4), a blocking system (9, 10 and 11) that cooperates with said guide tube (3) in order to prevent the latter from coming loose from the orthopaedic implant (2) during the tightening of the anchoring screw (6), and, on the outer periphery of the guide tube (3), a gripping knurl (8) for locking and/or unlocking the blocking system and for driving said guide tube (3) in rotation.

Description

TOURNEVIS ORTHOPEDIQUE A VERROUILLAGE AUTOMATIQUE La présente invention est relative à un tournevis à verrouillage automatique pour la mise en place, le serrage et/ou le desserrage d'implants orthopédique venant s'ancrer dans les tissus d'un corps osseux d'un individu.  The present invention relates to an automatic locking screwdriver for the positioning, clamping and / or loosening of orthopedic implants anchored in the tissues of an individual's bone body.
On connaît d'après le brevet Européen EP2962651 des tournevis amovibles permettant l'ancrage de vis osseuses pour la retenue d'implant orthopédique contre un corps osseux et plus particulièrement pour la fixation de connecteur pour implant rachidien. European patent EP2962651 discloses removable screwdrivers for anchoring bone screws for orthopedic implant retention against a bone body and more particularly for spinal implant connector fixation.
Le tournevis amovible comporte une partie d'accouplement permettant l'entraînement d'une tige dont la partie d'extrémité distale coopère avec la tête de la vis pédiculaire tandis que ladite partie d'accouplement vient se visser à l'intérieur de la forme en tulipe du connecteur pour implant rachidien. The removable screwdriver has a coupling portion for driving a rod whose distal end portion cooperates with the head of the pedicle screw while said coupling portion is screwed inside the form of connector tulip for spinal implant.
Ce type de tournevis doit d'une part maintenir le connecteur et d'autre part permettre l'entraînement en rotation de la vis d'ancrage pour sa fixation dans les tissus osseux. This type of screwdriver must on the one hand hold the connector and on the other hand allow the rotation of the anchoring screw for fixing in the bone tissue.
On constate que ce genre de tournevis, sous l'effet d'une résistance externe peut se désolidariser du connecteur à fixer provoquant un mauvais guidage de l'implant et fragilisant la tige de serrage. It is found that this kind of screwdriver, under the effect of an external resistance can separate from the connector to fix causing poor guidance of the implant and weakening the clamping rod.
Le tournevis suivant la présente invention a pour objet de résoudre ce problème en proposant un système de blocage permettant de verrouiller temporairement ledit tournevis sur l'implant le temps de l'ancrage de la vis de fixation dans les tissus osseux. The screwdriver according to the present invention aims to solve this problem by providing a locking system for temporarily locking said screwdriver on the implant the time of anchoring the fixation screw in the bone tissue.
Le tournevis à verrouillage automatique suivant la présente invention comprenant un tube de guidage à l'intérieur duquel est guidée et entraînée en rotation une tige de serrage dont l'une de ses extrémités est pourvue d'une empreinte permettant l'entraînement en rotation et le serrage d'une vis d'ancrage assurant l'immobilisation d'un implant orthopédique contre un corps osseux d'un individu, ledit tournevis comportant d'une part entre le tube de guidage et la tige de serrage un système de blocage coopérant avec ledit tube de guidage afin d'empêcher le desserrage de ce dernier de l'implant orthopédique lors du serrage de la vis d'ancrage et d'autre part sur la périphérie externe du tube de guidage une molette de préhension assurant le verrouillage et/ou le déverrouillage du système de blocage et l'entraînement en rotation dudit tube de guidage. The self-locking screwdriver according to the present invention comprising a guide tube inside which is guided and rotated a clamping rod whose one end is provided with a recess for driving in rotation and the tightening an anchoring screw for immobilizing an orthopedic implant against an osseous body of an individual, said screwdriver comprising firstly between the guide tube and the clamping rod a blocking system cooperating with said guide tube to prevent loosening of the latter of the orthopedic implant when tightening the anchor screw and secondly on the outer periphery of the guide tube a gripping wheel ensuring the locking and / or the unlocking the locking system and driving in rotation of said guide tube.
Le tournevis à verrouillage automatique suivant la présente invention comprend un système de blocage qui est constitué d'une tige de liaison comprenant sur sa périphérie une série de dents coopérant en fonction du sens de rotation de ladite tige avec une butée escamotable aménagée dans le tube de guidage. Le tournevis à verrouillage automatique suivant la présente invention comporte une butée escamotable dont le profil en forme de C comporte à l'intérieur de son ouverture un profil incliné. Le tournevis à verrouillage automatique suivant la présente invention comprend une butée escamotable dans laquelle est aménagée une lame souple pourvue sur sa face interne dirigée à l'intérieur dudit tube de guidage d'une dent. The self-locking screwdriver according to the present invention comprises a locking system which consists of a connecting rod comprising on its periphery a series of teeth cooperating as a function of the direction of rotation of said rod with a retractable stop arranged in the tube of guide. The self-locking screwdriver according to the present invention comprises a retractable stop whose C-shaped profile has inside its opening an inclined profile. The self-locking screwdriver according to the present invention comprises a retractable stop in which is arranged a flexible blade provided on its inner face directed inside said guide tube of a tooth.
Le tournevis à verrouillage automatique suivant la présente invention comprend une butée escamotable dont la dent présente un profil en arc de cercle qui est disposé dans le prolongement du profil circulaire de l'alésage interne du tube de guidage. The self-locking screwdriver according to the present invention comprises a retractable stop whose tooth has an arcuate profile which is arranged in the extension of the circular profile of the internal bore of the guide tube.
Le tournevis à verrouillage automatique suivant la présente invention comprend une tige de liaison comportant dans le prolongement des dents un dispositif de connexion constitué d'une part d'un alésage interne borgne et d'autre part d'un agencement de lamelles déformables élastiquement permettant de recevoir et de bloquer en translation et en rotation la tige de serrage. Le tournevis à verrouillage automatique suivant la présente invention comporte à l'opposé de la butée escamotable du tube de guidage un plot de transmission de couple. The self-locking screwdriver according to the present invention comprises a connecting rod comprising, in the extension of the teeth, a connecting device consisting on the one hand of a blind internal bore and on the other hand an arrangement of elastically deformable lamellae allowing receive and lock in translation and in rotation the clamping rod. The self-locking screwdriver according to the present invention comprises opposite the retractable stopper of the guide tube a torque transmission stud.
Le tournevis à verrouillage automatique suivant la présente invention comprend une molette de préhension comportant un premier espace à l'intérieur duquel coopère la butée escamotable et un second espace disposé à l'opposé du premier et à l'intérieur duquel est logé le plot de transmission de couple. The self-locking screwdriver according to the present invention comprises a gripping wheel having a first space within which the retractable stop cooperates and a second space disposed opposite the first and inside which is housed the transmission pad of couple.
Le tournevis à verrouillage automatique suivant la présente invention comprend à l'intérieur du premier espace de la molette de préhension une came dont le profil externe vient en contact avec celui incliné de l'ouverture de la butée escamotable. The self-locking screwdriver according to the present invention comprises inside the first space of the gripping wheel a cam whose outer profile comes into contact with the inclined one of the opening of the retractable abutment.
Le tournevis à verrouillage automatique suivant la présente invention comprend un second espace dont le profil interne permet de délimiter à proximité de l'alésage externe du tube de guidage une première butée dite « butée de vissage » et à l'opposé une seconde butée dite « butée de dévissage » sur lesquelles prend appui le plot de transmission de couple en fonction du sens de rotation de la molette de préhension autour du tube de guidage. La description qui va suivre en regard des dessins annexés et donnés à titre d'exemples non limitatifs permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente, et les avantages qu'elle est susceptible de procurer : Figure 1 est une vue en perspective illustrant un tournevis à verrouillage automatique pour la mise en place et la fixation d'un implant orthopédique selon l'invention. Figure 2 est une vue de profil représentant 1e tournevis à verrouillage automatique suivant l'invention. The self-locking screwdriver according to the present invention comprises a second space, the internal profile of which delimits, in the vicinity of the external bore of the guide tube, a first abutment known as a "screw abutment" and, on the opposite side, a second abutment referred to as " unscrewing stop "on which bears the torque transmission pad according to the direction of rotation of the gripping wheel around the guide tube. The description which follows with reference to the appended drawings and given by way of non-limiting examples will make it possible to better understand the invention, the characteristics that it presents, and the advantages that it is likely to provide: FIG. in perspective illustrating an automatic locking screwdriver for the establishment and fixation of an orthopedic implant according to the invention. Figure 2 is a side view showing the self-locking screwdriver according to the invention.
Figure 3 est une vue en coupe montrant le tournevis à verrouillage automatique suivant l'invention. Figure 3 is a sectional view showing the self-locking screwdriver according to the invention.
Figures 4 à 8 sont des vues illustrant le tube de guidage du tournevis à verrouillage automatique suivant l'invention. Figures ? et 8 sont des vues représentant la tige de liaison des moyens de blocage du tournevis à verrouillage automatique suivant l'invention. Figures 4 to 8 are views illustrating the guide tube of the self-locking screwdriver according to the invention. Figures? and 8 are views showing the connecting rod locking means of the self-locking screwdriver according to the invention.
Figures 9 et 10 sont des vues montrant la butée escamotable des moyens de blocage du tournevis à verrouillage automatique suivant l'invention, Figures 9 and 10 are views showing the retractable stop of the locking means of the self-locking screwdriver according to the invention,
Figures 11 et 12 sont des vues en coupe illustrant les positions de verrouillage et de déverrouillage de moyens de blocage du tournevis à verrouillage automatique suivant l'invention. On a montré en figures 1 à 3 un tournevis à verrouillage automatique 1 suivant la présente invention comprenant un tube de guidage 3 et une tige de serrage 4 venant coopérer respectivement avec un connecteur 2a en forme de U et une vis d'ancrage 6 d'un implant orthopédique 2, La vis d'ancrage 6 est prévu pour traverser le connecteur 2a afin que sa tête 6a à profil sphérique vienne en appui contre le fond du profil en U dudit connecteur 2a pour assurer une liberté angulaire et de positionnement audit connecteur par rapport à l'axe d'implantation de ladite vis d'ancrage 6 dans le corps d'une vertèbre Ve. Figures 11 and 12 are sectional views illustrating the locking and unlocking positions of locking means of the self-locking screwdriver according to the invention. FIGS. 1 to 3 show an automatic locking screwdriver 1 according to the present invention comprising a guide tube 3 and a clamping rod 4 which cooperate respectively with a U-shaped connector 2a and an anchoring screw 6 of FIG. an orthopedic implant 2, the anchoring screw 6 is provided to pass through the connector 2a so that its head 6a with a spherical profile bears against the bottom of the U-shaped profile of said connector 2a to ensure angular and positioning freedom to said connector by relative to the axis of implantation of said anchoring screw 6 in the body of a vertebra Ve.
L'immobilisation du connecteur 2a dans sa position angulaire définitive autour de l'axe de la vis d'ancrage 6 interviendra lors de la mise en place d'une tige de liaison dans le fond du profil en U dudit connecteur qui sera bloqué en translation et en rotation contre la tête 6a de ladite vis 6 par l'intermédiaire d'une vis de serrage non illustrée coopérant avec une zone filetée 2b aménagée dans la partie supérieure et interne du profil en U dudit connecteur. The immobilization of the connector 2a in its definitive angular position around the axis of the anchoring screw 6 will occur during the installation of a connecting rod in the bottom of the U-profile of said connector which will be locked in translation. and in rotation against the head 6a of said screw 6 by means of an unillustrated clamping screw cooperating with a threaded zone 2b arranged in the upper and inner part of the U-shaped profile of said connector.
Du fait des libertés de mouvement entre le connecteur 2a et la vis d'ancrage 6 le tournevis 1 doit impérativement venir s'immobiliser dans le dit connecteur tout en permettant l'entraînement en rotation de la vis d'ancrage 6. Due to the freedom of movement between the connector 2a and the anchoring screw 6, the screwdriver 1 must come to rest in said connector while allowing the rotation drive of the anchoring screw 6.
Le tournevis à verrouillage automatique 1 comprend un tube de guidage 3 pourvu à l'une de ses extrémités d'un profil externe fileté 3a venant coopérer avec la zone filetée interne 2b du connecteur 2a de manière à assurer l'immobilisation dudit tournevis 1 à l'intérieur dudit connecteur 2a de l'implant orthopédique 2. A l'extrémité opposée du profil fileté 3a le tube de guidage 3 comprend sur sa périphérie externe une butée escamotable 11 et suivant une direction diamétralement opposée un plot de transmission 12. La butée escamotable 11 présente un profil en forme de C dont l'ouverture 11a est tournée en direction du profil fileté 3a. La butée escamotable 1 1 est obtenue par l'usinage de la paroi externe du tube de guidage 3 délimitant une lame souple 1 1 b assurant une certaine liberté de mouvement à ladite butée par rapport à l'axe longitudinal dudit tube. The self-locking screwdriver 1 comprises a guide tube 3 provided at one of its ends with a threaded external profile 3a cooperating with the internal threaded zone 2b of the connector 2a so as to immobilize said screwdriver 1 to the inside said connector 2a of the orthopedic implant 2. At the opposite end of the threaded profile 3a the guide tube 3 comprises on its outer periphery a retractable stop 11 and in a diametrically opposite direction a transmission pad 12. The retractable stop 11 has a C-shaped profile whose opening 11a is turned towards the threaded profile 3a. The retractable stop 1 1 is obtained by machining the outer wall of the guide tube 3 delimiting a flexible blade 1 1b providing a certain freedom of movement to said stop with respect to the longitudinal axis of said tube.
La lame souple 11 b de la butée escamotable 11 comporte sur sa face interne et dirigé à l'intérieur de l'alésage interne 3b du tube de guidage 3 une dent 1 1ç dont le profil en arc de cercle est disposé dans le prolongement du profil circulaire dudit alésage interne. The flexible blade 11b of the retractable abutment 11 has on its inner face and directed inside the internal bore 3b of the guide tube 3 a tooth 1 1c whose arcuate profile is arranged in the extension of the profile circular of said internal bore.
La butée escamotable 1 1 et le plot de transmission 12 coopèrent avec une molette de préhension 8 agencée autour du tube de guidage 3 et permettant en fonction de son sens de rotation autour dudit tube de déplacer ou non ladite butée. The retractable stop 1 1 and the transmission stud 12 cooperate with a gripping wheel 8 arranged around the guide tube 3 and allowing depending on its direction of rotation around said tube to move or not said stop.
La molette de préhension 8 comporte un premier espace 8a à l'intérieur duquel coopère le profil en forme de C de la butée escamotable 1 1. A l'intérieur du premier espace 8a est aménagée une came 15 dont le profil externe vient en contact avec celui incliné 11d de l'ouverture 1 1a lors de la rotation de la molette de préhension 8 afin d'éloigner ou rapprocher la dent 11c de la butée escamotable 1 1 de l'axe centrale et longitudinale du tube de guidage 3 (figures 11 et 12). The gripping wheel 8 comprises a first space 8a inside which cooperates the C-shaped profile of the retractable abutment 1 1. Inside the first space 8a is arranged a cam 15 whose outer profile comes into contact with the inclined one 11d of the opening 1 1a during the rotation of the gripping wheel 8 in order to move the tooth 11c closer to or closer to the retractable stop 1 1 of the central and longitudinal axis of the guide tube 3 (FIGS. 12).
La molette de préhension 8 comporte un second espace 8b disposé à l'opposé du premier 8a et à l'intérieur duquel est logé le plot de transmission de couple 12 aménagé sur la périphérie du tube de guidage 3. The gripping wheel 8 comprises a second space 8b disposed opposite the first 8a and inside which is housed the torque transmission pad 12 arranged on the periphery of the guide tube 3.
Le second espace 8b présente un profil interne permettant de délimiter à proximité de l'alésage externe du tube de guidage 3 une première butée 13 dite « butée de vissage » et à l'opposé une seconde butée 14 dite « butée de dévissage » sur lesquelles prend appui le plot 12 en fonction du sens de rotation de la molette de préhension 8 autour dudit tube de guidage. The second space 8b has an internal profile for delimiting near the outer bore of the guide tube 3 a first abutment 13 called "screw abutment" and opposite a second abutment 14 called "abutment abutment" on which bears the pad 12 according to the direction of rotation of the grip wheel 8 around said guide tube.
Le tournevis à verrouillage automatique 1 comprend entre le tube de guidage 3 et la tige de serrage 4 une tige de liaison 9 permettant de relier ladite tige de serrage à une poignée de maintien 16. The self-locking screwdriver 1 comprises between the guide tube 3 and the clamping rod 4 a connecting rod 9 for connecting said clamping rod to a holding handle 16.
La tige de liaison 9 comporte à l'une de ses extrémités et sur sa périphérie externe une série de dents 10 dont le profil externe est complémentaire à celui de la dent 1 1c de la butée escamotable 11. La tige de liaison 9 comporte dans le prolongement des dents 10 un dispositif de connexion 17 constitué d'une part d'un alésage interne borgne 17a et d'autre part d'un agencement de lamelles déformables élastiquement 17b permettant de recevoir et de bloquer en translation et en rotation la tige de serrage 4. The connecting rod 9 has at one of its ends and on its outer periphery a series of teeth 10 whose external profile is complementary to that of the tooth 1 1c of the retractable stop 11. The connecting rod 9 comprises in the extension of the teeth 10 a connecting device 17 consisting on the one hand of a blind internal bore 17a and on the other hand an arrangement of elastically deformable strips 17b for receiving and locking in translation and rotation of the clamping rod 4.
La tige de serrage 4 présente, à l'opposé de sa connexion avec la tige de liaison 9, une empreinte externe 5 coopérant avec celle interne ménagée dans la tête 6a de la vis d'ancrage 6 pour permettre l'entraînement en rotation de cette dernière lorsque le tube de guidage 3 est immobilisé sur le connecteur 2a. The clamping rod 4 has, opposite its connection with the connecting rod 9, an external cavity 5 cooperating with the internal cavity formed in the head 6a of the anchoring screw 6 to allow the rotary drive of this last when the guide tube 3 is immobilized on the connector 2a.
On comprend de la description ci-dessus que la mise en place de l'implant orthopédique 2 dans la vertèbre Ve s'effectue de la manière de suivante : It is understood from the above description that the placement of the orthopedic implant 2 in the vertebra Ve is as follows:
> La poignée de préhension 8 est entraînée dans une rotation horaire autour du tube de guidage 3 afin de positionner le plot de transmission de couple 12 contre la première butée 13 dite « butée de vissage » afin que le couple de rotation soit transmis par ledit plot 12 au tube de guidage 3 ;  > The gripping handle 8 is driven in a clockwise rotation around the guide tube 3 in order to position the torque transmission pad 12 against the first abutment 13 called "screw stop" so that the torque is transmitted by said stud 12 to the guide tube 3;
> Les profils et les angles donnés respectivement aux dents 10 de la tige de liaison 9, et à la dent 11c de la butée escamotable 1 1 permettent que la dent 1 1 c lors de l'entraînement en rotation du tube de guidage 3 de sauter lesdites dents 10 de la tige de liaison 9. Il n'y a donc pas d'obstacle dans ce sens de rotation et le tube de guidage 3 peut se visser dans le connecteur 2a de l'implant 2 ;  > The profiles and the angles given respectively to the teeth 10 of the connecting rod 9, and to the tooth 11c of the retractable abutment 1 1 allow the tooth 1 1c during the driving in rotation of the guide tube 3 to jump said teeth 10 of the connecting rod 9. There is therefore no obstacle in this direction of rotation and the guide tube 3 can be screwed into the connector 2a of the implant 2;
Lorsque le tube de guidage 3 est totalement immobilisé dans le connecteur 2a de l'implant 2, la tige de serrage 4 est entraînée en rotation par l'intermédiaire de la poignée 16 et la tige de liaison 9 afin de visser la vis d'ancrage 6 dans le corps de la vertèbre Ve pour fixer l'implant 2.  When the guide tube 3 is totally immobilized in the connector 2a of the implant 2, the clamping rod 4 is rotated by means of the handle 16 and the connecting rod 9 in order to screw the anchor screw 6 in the body of the vertebra Ve to fix the implant 2.
Dans le cas de frottement externe provoqué par exemple par les chairs avoisinantes sur le tube de guidage 3, provoquant un effort inverse susceptible de dévisser ledit tube de guidage 3 de l'implant 2, on note que ce dernier est en fait retenue en rotation antihoraire par un système de blocage constitué par la dent 1 1ç de la butée escamotable 11 qui vient en opposition et en contact avec la dent correspondante 10 de la tige de liaison 9 empêchant audit tube de guidage 3 de se dévisser du connecteur 2. In the case of external friction caused for example by the surrounding flesh on the guide tube 3, causing a reverse force likely to unscrew said guide tube 3 of the implant 2, it is noted that the latter is in fact retained in counterclockwise rotation by a locking system consisting of the tooth 1 1ç of the retractable stop 11 which comes into opposition and in contact with the corresponding tooth 10 of the connecting rod 9 preventing said guide tube 3 from being unscrewed from the connector 2.
On comprend également de la description que le système de blocage du tournevis 1 peut être déverrouillé pour permettre le dévissage du tube de guidage 3 du connecteur 2a de l'implant 2 après son ancrage dans le corps osseux au moyen de la vis d'ancrage 6. It is also understood from the description that the locking system of the screwdriver 1 can be unlocked to allow the unscrewing of the guide tube 3 of the connector 2a of the implant 2 after its anchoring in the bone body by means of the anchoring screw 6 .
Le déverrouillage du système de blocage s'effectue par un mouvement antihoraire de la molette de préhension 8 autour du tube de guidage 3. Unlocking of the locking system is effected by a counterclockwise movement of the gripping wheel 8 around the guide tube 3.
En effet un jeu de rotation entre la molette de préhension 8 et le tube de guidage 3 permet de libérer la dent 1 1ç de la buté escamotable 1 1 qui est soulevée pendant la rotation grâce à la forme de came 15 ménagée dans le premier espace 8a de la molette de préhension 8. La dent 11ç est donc libérée des dents 10 de la tige de liaison 9. Indeed a rotation play between the gripping wheel 8 and the guide tube 3 allows to release the tooth 1 1ç of the retractable stop 1 1 which is raised during the rotation thanks to the camshaft 15 formed in the first space 8a of the grip knob 8. The tooth 11c is thus released from the teeth 10 of the connecting rod 9.
Simultanément lors de la rotation antihoraire de la molette de préhension 8 le plot de transmission de couple 12 vient en appui contre la seconde butée 14 dite « butée de dévissage » aménagée dans le seconde espace 8b de ladite molette. Simultaneously during the counterclockwise rotation of the gripping wheel 8 the torque transmission pad 12 abuts against the second abutment 14 called "unscrewing stop" arranged in the second space 8b of said wheel.
Le couple de rotation est alors transmis au tube de guidage 3 qui se dévisse du connecteur 2a_de l'implant 2. On note que le système de blocage agencés pour verrouiller en rotation antihoraire le tube de guidage 3 facilite l'utilisation du tournevis 1 et le serrage de la vis d'ancrage 6 dans le corps osseux surtout lorsque cette dernière est indépendante du connecteur 2a de l'implant 2. il doit d'ailleurs être entendu que la description qui précède n'a été donnée qu'à titre d'exemple, et qu'elle ne limite nullement le domaine de l'invention dont on ne sortirait pas en remplaçant les détails d'exécution décrits par tout autre équivalent, The rotational torque is then transmitted to the guide tube 3 which is unscrewed from the connector 2a of the implant 2. It is noted that the locking system arranged to lock in counterclockwise rotation the guide tube 3 facilitates the use of the screwdriver 1 and the tightening the anchoring screw 6 in the bone body especially when the latter is independent of the connector 2a of the implant 2. it must also be understood that the foregoing description has been given only as a example, and that it does not limit in any way the field of the invention of which one would not go out by replacing the details of execution described by any other equivalent,

Claims

REVENDICATIONS
Tournevis à verrouillage automatique (1 ) comprenant un tube de guidage (3) à l'intérieur duquel est guidée et entraînée en rotation une tige de serrage (4) dont l'une de ses extrémités est pourvue d'une empreinte (5) permettant l'entraînement en rotation et le serrage d'une vis d'ancrage (6) assurant l'immobilisation d'un implant orthopédique (2) contre un corps osseux d'un individu, caractérisé en ce qu'il comprend d'une part entre le tube de guidage (3) et la tige de serrage (4) un système de blocage (9, 10 et 1 1 ) coopérant avec ledit tube de guidage (3) afin d'empêcher le desserrage de ce dernier de l'implant orthopédique (2) lors du serrage de la vis d'ancrage (6) et d'autre part sur la périphérie externe du tube de guidage (3) une molette de préhension (8) assurant le verrouillage et/ou le déverrouillage du système de blocage et l'entraînement en rotation dudit tube de guidage (3). Self-locking screwdriver (1) comprising a guide tube (3) inside which is guided and rotated a clamping rod (4), one end of which is provided with an impression (5) enabling driving in rotation and tightening an anchoring screw (6) ensuring the immobilization of an orthopedic implant (2) against a bone body of an individual, characterized in that it comprises on the one hand between the guide tube (3) and the clamping rod (4) a locking system (9, 10 and 1 1) cooperating with said guide tube (3) to prevent loosening of the latter of the implant orthopedic (2) during the tightening of the anchoring screw (6) and secondly on the outer periphery of the guide tube (3) a gripping wheel (8) for locking and / or unlocking the locking system. blocking and rotating the said guide tube (3).
Tournevis à verrouillage automatique suivant la revendication 1 , caractérisé en ce que le système de blocage est constitué d'une tige de liaison (9) comprenant sur sa périphérie une série de dents (10) coopérant en fonction du sens de rotation de ladite tige (9) avec une butée escamotable (1 1 ) aménagée dans le tube de guidage (3). Self-locking screwdriver according to Claim 1, characterized in that the locking system consists of a connecting rod (9) comprising on its periphery a series of teeth (10) cooperating as a function of the direction of rotation of said rod ( 9) with a retractable stop (1 1) arranged in the guide tube (3).
Tournevis à verrouillage automatique suivant la revendication 2, caractérisé en ce que la butée escamotable (1 1 ) présente un profil en forme de C comportant à l'intérieur de l'ouverture (11a) un profil incliné (11 b). Self-locking screwdriver according to Claim 2, characterized in that the retractable stop (1 1) has a C-shaped profile with an inclined profile (11b) inside the opening (11a).
Tournevis à verrouillage automatique suivant la revendication 2, caractérisé en ce que la butée escamotable (1 1 ) comporte une lame souple (1 1 b) pourvue sur sa face interne dirigée à l'intérieur dudit tube de guidage (3) une dent (1 1ç). Self-locking screwdriver according to Claim 2, characterized in that the retractable stop (1 1) comprises a flexible blade (11b) provided on its inner face directed inside said guide tube (3) with a tooth (1 1 C).
Tournevis à verrouillage automatique suivant la revendication 4, caractérisé en ce que la dent (1 1ç) présente un profil en arc de cercle qui est disposé dans le prolongement du profil circulaire de l'alésage interne (3b) du tube de guidage (3). Self-locking screwdriver according to Claim 4, characterized in that the tooth (1 1c) has an arcuate profile which is arranged in the extension of the circular profile of the internal bore (3b) of the guide tube (3). .
Tournevis à verrouillage automatique suivant la revendication 2, caractérisé en ce que la tige de liaison (9) comporte dans le prolongement des dents (10) un dispositif de connexion (17) constitué d'une part d'un alésage interne borgne (17a) et d'autre part d'un agencement de lamelles déformables élastiquement (17b) permettant de recevoir et de bloquer en translation et en rotation la tige de serrage (4). Self-locking screwdriver according to Claim 2, characterized in that the connecting rod (9) has in the extension of the teeth (10) a connection device (17) consisting of a blind internal bore (17a) and on the other hand an arrangement of elastically deformable strips (17b) for receiving and locking in translation and in rotation the clamping rod (4).
7. Tournevis à verrouillage automatique suivant la revendication 2, caractérisé en ce que le tube de guidage (3) comporte à l'opposé de la butée escamotable (1 1 ) un plot de transmission de couple (12). Self-locking screwdriver according to Claim 2, characterized in that the guide tube (3) has, opposite the retractable stop (1 1), a torque transmission stud (12).
8. Tournevis à verrouillage automatique suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que la molette de préhension (8) comporte un premier espace (8a) à l'intérieur duquel coopère la butée escamotable (1 1 ) et un second espace (8b) disposé à l'opposé du premier (8a) et à l'intérieur duquel est logé le plot de transmission de couple (12). 8. Automatic locking screwdriver according to any one of claims 1 to 7, characterized in that the gripping wheel (8) comprises a first space (8a) inside which cooperates the retractable stop (1 1) and a second space (8b) disposed opposite the first (8a) and inside which is housed the torque transmission stud (12).
9. Tournevis à verrouillage automatique suivant la revendication 8, caractérisé en ce que à l'intérieur du premier espace (8a) est aménagée une came (15) dont le profil externe vient en contact avec celui incliné (11d) de l'ouverture (1 1 a) de la butée escamotable (1 1 ). Self-locking screwdriver according to Claim 8, characterized in that inside the first space (8a) is arranged a cam (15) whose external profile comes into contact with the inclined one (11d) of the opening ( 1 1 a) of the retractable stop (1 1).
10. Tournevis à verrouillage automatique suivant la revendication 8, caractérisé en ce que le second espace (8b) présente un profil interne permettant de délimiter à proximité de l'alésage externe du tube de guidage (3) une première butée (13) dite « butée de vissage » et à l'opposé une seconde butée (14) dite « butée de dévissage » sur lesquelles prend appui le plot (12) en fonction du sens de rotation de la molette de préhension (8) autour dudit tube de guidage. 10. Automatic locking screwdriver according to claim 8, characterized in that the second space (8b) has an internal profile for defining in the vicinity of the outer bore of the guide tube (3) a first abutment (13) called " screw abutment "and opposite a second abutment (14) called" unscrewing stop "on which bears the stud (12) according to the direction of rotation of the gripping wheel (8) around said guide tube.
PCT/EP2017/061404 2016-05-18 2017-05-11 Orthopaedic screwdriver with automatic locking WO2017198553A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2018561055A JP7160687B2 (en) 2016-05-18 2017-05-11 self-locking orthopedic screwdriver
EP17722052.2A EP3457962A1 (en) 2016-05-18 2017-05-11 Orthopaedic screwdriver with automatic locking

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1654433A FR3051351B1 (en) 2016-05-18 2016-05-18 AUTOMATIC LOCKING SCREWDRIVER
FR1654433 2016-05-18

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WO2017198553A1 true WO2017198553A1 (en) 2017-11-23

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JP (1) JP7160687B2 (en)
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US20090275954A1 (en) * 2008-04-30 2009-11-05 Phan Christopher U Apparatus and methods for inserting facet screws
WO2012057386A1 (en) * 2010-10-28 2012-05-03 주식회사 디오메디칼 Driver for fixing pedicle screw
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170333093A1 (en) * 2016-05-18 2017-11-23 Clariance Self-locking screwdriver
US10575881B2 (en) * 2016-05-18 2020-03-03 Clariance Self-locking screwdriver

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JP2019517853A (en) 2019-06-27
FR3051351B1 (en) 2019-05-03
JP7160687B2 (en) 2022-10-25
EP3457962A1 (en) 2019-03-27
FR3051351A1 (en) 2017-11-24

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