WO2004086991A1 - Vis d'osteosynthese - Google Patents

Vis d'osteosynthese Download PDF

Info

Publication number
WO2004086991A1
WO2004086991A1 PCT/CH2003/000221 CH0300221W WO2004086991A1 WO 2004086991 A1 WO2004086991 A1 WO 2004086991A1 CH 0300221 W CH0300221 W CH 0300221W WO 2004086991 A1 WO2004086991 A1 WO 2004086991A1
Authority
WO
WIPO (PCT)
Prior art keywords
thread
bone screw
tool
longitudinal axis
threaded shaft
Prior art date
Application number
PCT/CH2003/000221
Other languages
German (de)
English (en)
Inventor
Chad Munro
Cristian Raehle
Original Assignee
Stratec Medical Ag
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 Stratec Medical Ag filed Critical Stratec Medical Ag
Priority to PCT/CH2003/000221 priority Critical patent/WO2004086991A1/fr
Priority to AU2003212185A priority patent/AU2003212185A1/en
Priority to TW093106673A priority patent/TW200507797A/zh
Priority to ARP040100965A priority patent/AR043758A1/es
Priority to CL200400673A priority patent/CL2004000673A1/es
Publication of WO2004086991A1 publication Critical patent/WO2004086991A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue
    • A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/866—Material or manufacture

Definitions

  • the invention relates to a bone screw according to the preamble of patent claim 1 and to a method for producing a bone screw according to the preamble of patent claim 11.
  • the bone screws that can be used in osteosynthesis are subject to various requirements, such as
  • Bone screws in particular pedicle screws, must be kept small in diameter because of the dimensions of pedicles or also of bone fragments;
  • the bone screws must withstand the static and dynamic loads.
  • Such a bone screw with a thread whose thread depth decreases towards the screw head is known from WO 90/02526 BLAIR.
  • the thread has a constant outside diameter, so that a stronger core can be produced due to the reduced thread depth, which gives the bone screw increased strength. Furthermore, the reduced thread depth compresses the bone material between the threads.
  • a disadvantage of this known bone screw is that the compression takes place only in the radial direction, as a result of which the load-bearing capacity of the bone is increased only in the radial direction.
  • the production of this known bone screw is very complex.
  • the width between the two thread flanks enclosing the thread rib remains constant, while the width between two thread ribs at the core of the thread increases.
  • the production of such a varying thread profile requires machining the thread in several steps or with several tools.
  • the invention seeks to remedy this.
  • the invention has for its object to provide a bone screw with a threaded shaft, the thread of which can be produced without complex tool displacements and with a single tool.
  • the invention achieves the stated object with a bone screw, which has the features of claim 1, and with a method for producing a bone screw, which has the steps of claim 11.
  • the bone screw is suitable for use as a hip screw in the proximal femur;
  • a constant width can be produced at the core between two adjacent thread grooves, so that the thread can be produced with a single tool and one operation;
  • the reduction in the cross-sectional area of the thread groove viewed in a cross section orthogonal to the longitudinal axis is achieved by a core diameter D K increasing from the front end to the rear end of the threaded shaft.
  • this increase in the core diameter D ⁇ over the length L of the threaded shaft can be configured continuously or discontinuously. This has the advantage that compression of the spongy bone structure can be achieved without destroying it, which also enables better power transmission between the bone screw and the bone, with radial compression due to the increasing core diameter and on the other hand an axial compression between the threads can be achieved by the increasing thread profile with constant thread pitch.
  • flank angle of at least one flank segment of the threaded rib is constant over the length L of the threaded shaft.
  • the thread comprises a thread rib, which is viewed in a cross section orthogonal to the longitudinal axis and, measured at the core of the threaded shaft, has a constant flank angle ⁇ > 0 over at least part of the length L.
  • the flank angle ⁇ > 0 causes an axial compression of the bone material, which is thereby made more stable in the axial direction.
  • the flank angle ⁇ of the flank part bordering the thread core is in a range from 10 ° to 50 °, preferably from 20 ° to 40 °.
  • the thread comprises a thread rib which has a flank angle ß on the core and a flank angle ß 'on the thread periphery, the flank angles ß and ß' being different from one another at least over part of the length L.
  • the design of the thread rib with a flank angle ⁇ ' has the advantage that there is no "knife edge" without significantly reducing the amount of bone material lying between the individual turns. Efficient bone compression requires that as much bone material as possible in the thread grooves, thus drastically reducing the cutting effect of the thread when there is a relative movement between the bone and the screw under load.
  • the thread segment with the flank angle ⁇ ' extends only over a part of the length of the threaded shaft which borders on the front end of the external thread and disappears against the rear end of the threaded shaft.
  • the core diameter DK of the threaded shaft increases discontinuously towards the rear end of the threaded shaft. This version is essentially suitable for very small screw-in depths of the bone screw in the bone, where compression is still required.
  • the thread is designed with a symmetrical thread profile. This provides the advantage that the bone screw has approximately the same properties with regard to tensile and compressive stress (pulling out / puncturing).
  • the thread is designed with an asymmetrical thread profile, so that the bone screw can be optimized for one-sided loading, for example to max. Pull-out force, but low puncture force when the tensile load prevails or vice versa to max. Puncture force, but low pull-out force with prevailing pressure load.
  • the thread is a multi-start thread, preferably a 2-start thread.
  • the contact area between the thread and the bone must be increased.
  • a multiplication of the thread turns at the same pitch is advantageously used, so that the anchoring of the bone screw is also improved without, however, as in the first case, increasing the screwing time for the bone screw.
  • the bone screw according to the invention can be used alone or together with other osteosynthetic devices.
  • the bone screw according to the invention can be used as a hip screw together with an intramedullary nail for the fixation of the hip joint head.
  • the bone screw has advantages especially in cancellous bone in places where high stress occurs, particularly on condyles, tibia proximal and distal, humerus proximal, foot or spine.
  • FIG. 1 shows a longitudinal section through the threaded shaft of an embodiment of the bone screw according to the invention.
  • FIG. 2 shows a view of an embodiment of the bone screw according to the invention
  • FIG. 3 shows a detail from the thread on the front segment of the threaded shaft of the embodiment of the bone screw according to the invention shown in FIG. 2;
  • FIG. 4 shows a detail from the thread on the rear segment of the threaded shaft of the embodiment of the bone screw according to the invention shown in FIG. 2;
  • Fig. 5 is a schematic representation of the method for producing a bone screw.
  • the thread 6 has a constant outside diameter D and has a thread rib 17 and a thread groove 18.
  • the flank angle ⁇ of the thread rib 17 and the width b of the thread groove 18 measured in the front and rear segment 11; 12 of the thread shaft 5 at the core 7 of the thread shaft 5 are constant between the front end 3 and the rear end 4 of the threaded shaft 5.
  • the cross-sectional area of the threaded groove 18 viewed in a cross section orthogonal to the longitudinal axis 2 is reduced between the front end 3 and the rear end 4 of the threaded shaft 5 for the purpose of compressing the bone material in the axial and radial directions.
  • the reduction in the cross-sectional area of the thread groove 18 is achieved in this embodiment of the bone screw 1 according to the invention in that in the rear segment 12 of the threaded shaft 5 the core diameter DK of the threaded shaft 5 is larger than in the front segment 12 of the threaded shaft 5.
  • the configuration of the thread groove 18 with a width b at the core 7 of the threaded shaft 5 which is constant over the length L and a constant flank angle ⁇ of the thread rib 17 means that the cross-sectional area 20 of the thread groove 18 having a height h in the rear segment 12 is identical to a part of the cross-sectional area 19 having the height h in the front segment 11.
  • FIG. 2 Shown in FIG. 2 is a bone screw 1, the thread 6 of which differs from the thread 6 shown in FIG. 1 only in that, in a cross section orthogonal to the longitudinal axis 2, the threaded rib 17 in the front segment 11 has two different flank angles ⁇ ; 'Flank segments 9; 10 (FIG. 3), the threaded rib 17 comprising an inner flank segment 10 adjacent to the core 7 of the threaded shaft 5 and an outer flank segment 9 bordering the thread periphery 8.
  • the flank angle ⁇ 'of the peripheral flank part 9 measured at the outer diameter D is 0 °
  • the flank angle ⁇ of the flank part 10 bordering the thread core 7 is 40 ° here.
  • FIG. 5 the method for producing a bone screw 1 (Fig. 2) is shown schematically. The process includes the following steps:
  • steps c) to f) are repeated until the penetration depth Xj corresponds to the desired thread depth T.

Abstract

Vis d'ostéosynthèse (1) qui comporte une tige filetée (5) pourvue d'un axe longitudinal (2), d'une longueur L, d'une extrémité avant (3), d'une extrémité arrière (4) et d'un filetage (6) possédant un profil P. Le diamètre externe D et le pas du filetage (6) sont constants sur la longueur L et le profil P de filetage se réduit dans la direction de l'extrémité arrière (4) de la tige filetée, au moins sur une partie de la longueur L. Le profil P du filetage sur la partie centrale (7) de la tige filetée (5) possède, sur la longueur L, une largeur constante b.
PCT/CH2003/000221 2003-04-03 2003-04-03 Vis d'osteosynthese WO2004086991A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/CH2003/000221 WO2004086991A1 (fr) 2003-04-03 2003-04-03 Vis d'osteosynthese
AU2003212185A AU2003212185A1 (en) 2003-04-03 2003-04-03 Bone screw
TW093106673A TW200507797A (en) 2003-04-03 2004-03-12 Bone screw
ARP040100965A AR043758A1 (es) 2003-04-03 2004-03-24 Tornillo osteologico
CL200400673A CL2004000673A1 (es) 2003-04-03 2004-03-30 Un dispositivo de fijacion de una pieza por medio de un organo de fijacion, que toma la forma de un perno con hilo, donde el perno esta hecho para ejercer un esfuerzo radial en el roscado de dicha pieza.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2003/000221 WO2004086991A1 (fr) 2003-04-03 2003-04-03 Vis d'osteosynthese

Publications (1)

Publication Number Publication Date
WO2004086991A1 true WO2004086991A1 (fr) 2004-10-14

Family

ID=33102856

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2003/000221 WO2004086991A1 (fr) 2003-04-03 2003-04-03 Vis d'osteosynthese

Country Status (5)

Country Link
AR (1) AR043758A1 (fr)
AU (1) AU2003212185A1 (fr)
CL (1) CL2004000673A1 (fr)
TW (1) TW200507797A (fr)
WO (1) WO2004086991A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006007553A3 (fr) * 2004-07-01 2006-04-13 Smith & Nephew Inc Elements de fixation
WO2007048267A1 (fr) * 2005-10-28 2007-05-03 Medartis, Ag Taraud pour former des filets
WO2007086622A1 (fr) * 2006-01-27 2007-08-02 Osstem Implant Co., Ltd Dispositif de fixation
WO2012079610A1 (fr) * 2010-12-17 2012-06-21 Stryker Trauma Gmbh Élément de fixation d'os et son procédé de fabrication
US10335216B2 (en) 2011-07-15 2019-07-02 Globus Medical, Inc. Screw implants for bone fusion
US10925653B2 (en) 2011-07-15 2021-02-23 Globus Medical, Inc. Screw implants for bone fusion
US10939944B2 (en) 2018-04-18 2021-03-09 Glw, Inc. Removable orthopedic screws

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990002526A1 (fr) 1988-09-09 1990-03-22 Australian Defence Industries Pty. Limited Vis
US5571139A (en) * 1995-05-19 1996-11-05 Jenkins, Jr.; Joseph R. Bidirectional suture anchor
FR2739151A1 (fr) * 1995-09-22 1997-03-28 Numedic Dispositif de solidarisation d'une piece sur un support
US20010047175A1 (en) * 2000-03-14 2001-11-29 Doubler Robert L. Method of making a bonescrew
US20020022862A1 (en) * 1996-08-05 2002-02-21 Arthrex, Inc. Hex drive bioabsorbable tissue anchor
US20020128657A1 (en) * 2001-02-21 2002-09-12 Henrik Hansson Bone screw, method for producing the threads thereof and drill for drilling holes therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990002526A1 (fr) 1988-09-09 1990-03-22 Australian Defence Industries Pty. Limited Vis
US5571139A (en) * 1995-05-19 1996-11-05 Jenkins, Jr.; Joseph R. Bidirectional suture anchor
FR2739151A1 (fr) * 1995-09-22 1997-03-28 Numedic Dispositif de solidarisation d'une piece sur un support
US20020022862A1 (en) * 1996-08-05 2002-02-21 Arthrex, Inc. Hex drive bioabsorbable tissue anchor
US20010047175A1 (en) * 2000-03-14 2001-11-29 Doubler Robert L. Method of making a bonescrew
US20020128657A1 (en) * 2001-02-21 2002-09-12 Henrik Hansson Bone screw, method for producing the threads thereof and drill for drilling holes therefor

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006007553A3 (fr) * 2004-07-01 2006-04-13 Smith & Nephew Inc Elements de fixation
WO2007048267A1 (fr) * 2005-10-28 2007-05-03 Medartis, Ag Taraud pour former des filets
US8403972B2 (en) 2005-10-28 2013-03-26 Medartis Ag Thread-forming screw
WO2007086622A1 (fr) * 2006-01-27 2007-08-02 Osstem Implant Co., Ltd Dispositif de fixation
WO2012079610A1 (fr) * 2010-12-17 2012-06-21 Stryker Trauma Gmbh Élément de fixation d'os et son procédé de fabrication
US9198701B2 (en) 2010-12-17 2015-12-01 Stryker Trauma Gmbh Bone fastener and method of manufacturing the same
US10335216B2 (en) 2011-07-15 2019-07-02 Globus Medical, Inc. Screw implants for bone fusion
US10925653B2 (en) 2011-07-15 2021-02-23 Globus Medical, Inc. Screw implants for bone fusion
US11723703B2 (en) 2011-07-15 2023-08-15 Globus Medical, Inc. Screw implants for bone fusion
US10939944B2 (en) 2018-04-18 2021-03-09 Glw, Inc. Removable orthopedic screws
US11793559B2 (en) 2018-04-18 2023-10-24 Glw, Inc. Removable orthopedic screws

Also Published As

Publication number Publication date
CL2004000673A1 (es) 2005-01-07
AR043758A1 (es) 2005-08-10
AU2003212185A1 (en) 2004-10-25
TW200507797A (en) 2005-03-01

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