WO1998031293A1 - Visse pediculaire a filet double - Google Patents

Visse pediculaire a filet double Download PDF

Info

Publication number
WO1998031293A1
WO1998031293A1 PCT/CH1997/000011 CH9700011W WO9831293A1 WO 1998031293 A1 WO1998031293 A1 WO 1998031293A1 CH 9700011 W CH9700011 W CH 9700011W WO 9831293 A1 WO9831293 A1 WO 9831293A1
Authority
WO
WIPO (PCT)
Prior art keywords
pedicle screw
screw according
shaft part
start thread
designed
Prior art date
Application number
PCT/CH1997/000011
Other languages
German (de)
English (en)
Inventor
Thomas Amrein
Original Assignee
Synthes Ag Chur
Synthes (U.S.A.)
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 Synthes Ag Chur, Synthes (U.S.A.) filed Critical Synthes Ag Chur
Priority to PCT/CH1997/000011 priority Critical patent/WO1998031293A1/fr
Priority to AU11882/97A priority patent/AU1188297A/en
Priority to TW086118077A priority patent/TW351742B/zh
Publication of WO1998031293A1 publication Critical patent/WO1998031293A1/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

Definitions

  • the invention relates to a pedicle screw according to the preamble of claim 1.
  • the invention seeks to remedy this.
  • the invention is based on the problem that at least 4 pedicle screws have to be implanted per operation and that a shorter installation time of the pedicle screws saves the patient avoidable operating time.
  • the invention solves the problem with a pedicle screw, which has the features of claim 1.
  • This provides the advantage that, with the same holding force in the bone tissue, the pedicle screw performs an x-fold axial displacement along the screw axis per revolution and can therefore be screwed into the bone more quickly, as is possible with single-screw screws according to the prior art.
  • the pitch angle ⁇ of the two-start thread is expediently between 7 ° and 11 °, preferably between
  • the outside diameter of the two-start thread is 5-8 mm, preferably 4-7 mm and the thread pitch P is 2.0-4 mm, preferably 2.5-3.5 mm.
  • the flank angle diameter d of the two-start thread is 3 - 9 mm, preferably 4 - 8 mm and the depth of the two-start thread is 0.4 - 0.8 mm, preferably 0.5 - 0.7 mm.
  • the shaft part can be a cone, preferably with a
  • the shaft part is advantageously designed as a drill tip, awl or trocar.
  • the terminal, free part of the shaft part is thread-free.
  • the shaft part of the pedicle screw is self-tapping (with one or more cutting grooves) or is designed to be displacing. It has the advantage that the pedicle screw can be easily screwed into the bone and that it is well anchored in the bone.
  • the core diameter of the shaft part having the two-start thread tapers conically towards the free end part of the shaft part.
  • the outside diameter of the two-start thread can either also taper conically in the same direction or remain constant.
  • the conical design - with a cone angle of approximately 3.5 ° - results in a further improvement in the clinically achievable results.
  • 1 a perspective view of a pedicle screw according to the invention with a longitudinal member inserted therein; 2: a modified pedicle screw according to the invention with a drill tip;
  • the pedicle screw according to the invention shown in FIG. 1 essentially has a head part 1 and a shaft part 3.
  • the head part 1 is designed to receive a side member 2 and for this purpose has two legs 5, 6, between which the side member 2 can be inserted from above.
  • Fixing the side member 2 can be done in a known manner with a
  • Fixation screw 7 take place, whose external thread 8 fits to the internal thread 9 attached to the legs 5, 6.
  • the shaft part 3 is designed for anchoring in the bone and has a two-start thread 4 for this purpose.
  • the two-start thread 4 is shown in detail in FIG. 2 and has a pitch angle ⁇ of 9 °.
  • the flank angle diameter d of the two-start thread 4 is 6 mm.
  • the outside diameter of the two-start thread 4 is expediently 5.5 mm.
  • the thread pitch P of the two-start thread 4 is expediently 3 mm.
  • the depth of the two-start thread 4 is 0.6 mm.
  • Fig. 1 the front (unthreaded) end of Schaftteil ⁇ 3 is designed as a cone with a cone angle of 15 °.
  • the locking mechanism not essential to the invention for the fixation of the longitudinal beam 1 in the head part 1 of the pedicle screw can also be carried out differently than shown in Fig. 1, namely ge ass the known designs in this field.
  • the yoke-like design of the head part 1 with the two legs 5, 6 can be replaced by a laterally open recess and the fixation screw 7 can also be designed as a cap, which extends over the two legs 5, 6, which must then have a corresponding external thread .
  • 2 to 5 show variants of the front end of the shaft part 3, all other structural details corresponding to those of the embodiment of FIG. 1.
  • the front shaft part 3 is designed as a drill tip, in FIG. 3 as an awl, in FIG. 4 as a trocar and in FIG. 5, the terminal, free part of the shaft part 3 is self-tapping with one or more cutting grooves 13 is.
  • the core diameter can be constant (as shown in the figures) or can taper conically towards the free end part of the sheep part.
  • the outside diameter of the two-start thread can either also taper conically in the same direction or remain constant.

Abstract

L'invention concerne une visse pédiculaire comprenant une tête (1) conçue pour recevoir un support longitudinal (2), et une queue (3) conçue pour s'ancrer dans l'os. Cette queue (3) comporte un filet double (4) présentant un angle d'hélice β compris entre 5° et 16°.
PCT/CH1997/000011 1997-01-14 1997-01-14 Visse pediculaire a filet double WO1998031293A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CH1997/000011 WO1998031293A1 (fr) 1997-01-14 1997-01-14 Visse pediculaire a filet double
AU11882/97A AU1188297A (en) 1997-01-14 1997-01-14 Pedicle screw with double thread
TW086118077A TW351742B (en) 1997-01-14 1997-12-02 Pedicle screw with two threads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH1997/000011 WO1998031293A1 (fr) 1997-01-14 1997-01-14 Visse pediculaire a filet double

Publications (1)

Publication Number Publication Date
WO1998031293A1 true WO1998031293A1 (fr) 1998-07-23

Family

ID=4550853

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1997/000011 WO1998031293A1 (fr) 1997-01-14 1997-01-14 Visse pediculaire a filet double

Country Status (3)

Country Link
AU (1) AU1188297A (fr)
TW (1) TW351742B (fr)
WO (1) WO1998031293A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002045606A1 (fr) * 2000-12-08 2002-06-13 Synthes Ag Chur Dispositif pour fixer des os, notamment des corps vertebraux les uns par rapport aux autres
WO2004000146A1 (fr) * 2002-06-21 2003-12-31 Synthes Ag Chur Vis d'osteosynthese
US7018378B2 (en) 2000-12-27 2006-03-28 Biedermann Motech Gmbh Screw
WO2008051737A1 (fr) * 2006-10-26 2008-05-02 Warsaw Orthopedic, Inc. Vis à os
US8636783B2 (en) 2006-12-29 2014-01-28 Zimmer Spine, Inc. Spinal stabilization systems and methods
DE102013202065A1 (de) * 2013-02-08 2014-08-14 Silony Medical International AG Osteosynthesevorrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE538636C2 (en) * 2014-12-12 2016-10-04 Essve Produkter Ab Concrete screw

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887596A (en) * 1988-03-02 1989-12-19 Synthes (U.S.A.) Open backed pedicle screw
WO1991009572A1 (fr) * 1989-12-21 1991-07-11 Bakinsky Nauchno-Issledovatelsky Institut Travmatologii I Ortopedii Vis de compression pour osteosynthese
DE4106876A1 (de) * 1990-03-19 1991-09-26 Synthes Ag Osteosynthetische ankerschraube
EP0557899A1 (fr) * 1989-10-26 1993-09-01 Giuseppe Vrespa Outil coupant pour former une forure tronconique précise dans un os
GB2289416A (en) * 1994-05-14 1995-11-22 James Bruce Richardson Bone screw

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887596A (en) * 1988-03-02 1989-12-19 Synthes (U.S.A.) Open backed pedicle screw
EP0557899A1 (fr) * 1989-10-26 1993-09-01 Giuseppe Vrespa Outil coupant pour former une forure tronconique précise dans un os
WO1991009572A1 (fr) * 1989-12-21 1991-07-11 Bakinsky Nauchno-Issledovatelsky Institut Travmatologii I Ortopedii Vis de compression pour osteosynthese
DE4106876A1 (de) * 1990-03-19 1991-09-26 Synthes Ag Osteosynthetische ankerschraube
GB2289416A (en) * 1994-05-14 1995-11-22 James Bruce Richardson Bone screw

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002045606A1 (fr) * 2000-12-08 2002-06-13 Synthes Ag Chur Dispositif pour fixer des os, notamment des corps vertebraux les uns par rapport aux autres
US7666207B2 (en) 2000-12-08 2010-02-23 Synthes Usa, Llc Fixation device for bones
US7018378B2 (en) 2000-12-27 2006-03-28 Biedermann Motech Gmbh Screw
WO2004000146A1 (fr) * 2002-06-21 2003-12-31 Synthes Ag Chur Vis d'osteosynthese
WO2008051737A1 (fr) * 2006-10-26 2008-05-02 Warsaw Orthopedic, Inc. Vis à os
US8414628B2 (en) 2006-10-26 2013-04-09 Warsaw Orthopedic, Inc. Bone screw
US8636783B2 (en) 2006-12-29 2014-01-28 Zimmer Spine, Inc. Spinal stabilization systems and methods
DE102013202065A1 (de) * 2013-02-08 2014-08-14 Silony Medical International AG Osteosynthesevorrichtung
DE102013202065B4 (de) * 2013-02-08 2017-09-07 Silony Medical International AG Osteosynthesevorrichtung

Also Published As

Publication number Publication date
TW351742B (en) 1999-02-01
AU1188297A (en) 1998-08-07

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