FR2876897A1 - Improvement to implantable surgical screws - Google Patents

Improvement to implantable surgical screws Download PDF

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Publication number
FR2876897A1
FR2876897A1 FR0411368A FR0411368A FR2876897A1 FR 2876897 A1 FR2876897 A1 FR 2876897A1 FR 0411368 A FR0411368 A FR 0411368A FR 0411368 A FR0411368 A FR 0411368A FR 2876897 A1 FR2876897 A1 FR 2876897A1
Authority
FR
France
Prior art keywords
screw
characterized
polygonal
proximal
screw according
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
FR0411368A
Other languages
French (fr)
Inventor
Louis Samuel Barouk
Thierry Souillat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DePuy Ireland ULC
Original Assignee
DePuy Ireland ULC
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 DePuy Ireland ULC filed Critical DePuy Ireland ULC
Priority to FR0411368A priority Critical patent/FR2876897A1/en
Publication of FR2876897A1 publication Critical patent/FR2876897A1/en
Application status is Pending legal-status Critical

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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
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B17/8605Heads, i.e. proximal ends projecting from bone
    • 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
    • A61B17/88Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875Screwdrivers, spanners or wrenches

Abstract

Implantable surgical screw, intended in particular to be screwed into bone or into bone fragments and having, at its proximal end, a polygonal impression (5), characterized in that it comprises, in addition, at least one, and preferably at least two radial grooves (6) extending from the polygonal cavity (5) towards the periphery of the proximal portion of the screw, these radial grooves (6) being intended to cooperate with complementary reliefs presented by a screwdriver or tool screwing device having a polygonal portion complementary to the impression of the screw, from which extend said complementary reliefs.

Description

The present invention relates to: an improvement to surgical screws

  implantable, screws intended to be screwed into bone or bone fragments in the context of orthopedic surgery.

  Numerous types of implantable screws intended to be screwed into bone or parts or fragments of bone are already known in the context of various surgical procedures, such as, for example, the temporary or definitive fixation of bone prostheses, of pins or stems or joint prostheses, or simply to bring together bone fragments, either after fracture or after osteotomy, for example in the case of Scarf osteotomy.

  In general, surgical screws are described, for example in US Patents 4,175,555, 5,019,079, WO 91/09572, EP 0 491 211, WO 93/15682.

  Patent EP 1 273 273 describes a small cannulated screw, called FRSScrew, intended to fix bone fragments, in particular after Scarf osteotomy and comprising a distal portion threaded over substantially its entire length, a proximal portion of greater diameter also threaded, the pitches of the proximal thread being smaller than the pitch of the distal thread, the distal and proximal threads having self-tapping notches, as well as self-drilling notches.

  Such a screw may be subjected to relatively large tightening torques relative to the material thickness of the screw, particularly at the level of the cannula and the hexagonal recess receiving the screwing tool.

  Such a cannulated screw, of particularly small dimensions, has also been described in the patent application EP 0 695 537.

  The patent EP 0 695 537 describes a small self-compressing screw, called Barouk screw, intended to fix bone fragments and generally having a cannula opening into a hexagonal recess receiving the screwing tool. This screw is also subject to significant torque during screwing.

  The design and production of these surgical screws are subject to contradictory constraints since they must, in particular, have, on the one hand, dimensions as small as possible in order to reduce their invasiveness, and on the other hand, ensure excellent fixation in bone tissue and, if possible, good osteointegration, while being particularly resistant; the failure of such a screw during or after surgical implantation is hardly tolerable.

  For these reasons, the implantable screws, especially when they are small, generally have, at their head, a polygonal cavity, typically hexagonal, to receive a screwdriver such as a screwdriver or hex key.

  However, given the miniaturization of these screws and the screwing forces and tapping important to which they are subject, the need to provide such recesses, and singularly in the case of cannulated screws, weakens the resistance to torsion of the head quote.

  The problem is further increased, when instead of Barouk cannulated screws, which are screwed into a hole of adequate size in the distal and proximal portion of the screw, previously screwed into the bone, and guided, screws which are, in addition, self-drilling as for example the screws described in patent EP 1 273 273 relating to the so-called screw FRS-Screw. In particular, the torsion torque to which these self-drilling screws are subjected becomes greater, especially when the cortical bone portion is traversed by the screw head, this type of screw being placed without specific preparation of the location of the screw head. because it is self-drilling In addition, it may be desirable to have, in the operating room, a single screwdriver to screw the small screws of different diameters, which makes it even more difficult to search for an optimal dimension of the obvious hexagonal screw head and hexagonal male shape complementary to the screwdriver.

  The invention therefore proposes to overcome these drawbacks and to provide implantable screws, preferably, but not exclusively, of small dimensions, capable of supporting a greater screwing torque while increasing the safety of the cooperation between the screw and the screwing tool, without weakening the screw and the screwdriver.

  The invention relates to an implantable surgical screw, intended in particular to be screwed into bone or into bone fragments and having, at its proximal end, a polygonal, preferably hexagonal, impression forming a female polygonal recess, characterized in that it further comprises at least one and preferably at least two radial grooves extending from the hexagonal recess towards the periphery of the proximal part of the screw, these radial grooves being intended to cooperate with one or complementary reliefs presented by a screwdriver or screwing tool having a polygonal portion complementary to the footprint of the vlis, from which extend said complementary reliefs.

  Said grooves are preferably two in number and diametrically opposed, but it is conceivable that a larger number could be provided, for example three angularly equidistant grooves or four cross-grooves.

  It is preferred that the radial grooves be formed of radial female notches disposed in the upper edge of the recess.

  In this case, the screwdriver has at its end a male polygonal portion, penetrating into the polygonal portion of the screw over the entire depth of said cavity, the complementary reliefs of the screwdriver being formed by two diametrically opposite ribs located relative to the end. distal to the screwdriver, at a distance corresponding substantially to the depth of the polygonal cavity of the screw minus the axial depth of the notches.

  The invention also relates to screwdrivers or screwing tools complementary screws defined in the invention.

  The invention has found that the torsional strength of surgical screws according to the invention can be increased by more than 60% and even beyond 90% at the screw head, which is considerable and unexpected. A significant improvement in the resistance of the screwdrivers and a significant reduction in the risk of slipping the screwdriver into the screw is also obtained.

  Although the invention can be used for surgical screws of any size, the preferred screws according to the invention have a maximum diameter, for example of proximal portion or head, less than or equal to 4 mm. The screws according to the invention are preferably self-tapping screws and more preferably also self-drilling screws.

  They may preferably be of the Barouk screw or FRS-screw type and have a smaller diameter distal thread and a larger diameter proximal thread, the pitch of the two threads preferably being different, for example smaller for threading. proximal, which makes it possible to exert a compression effort. Particularly preferably, these self-tapping screws, and / or self-drilling, and which can be cannulated or not, have a maximum proximal diameter less than or equal to 4 mm.

  Other advantages and characteristics of the invention will become apparent on reading the following description given by way of non-limiting example and with reference to the accompanying drawing in which: FIG. 1 represents a surgical screw called FRS-screw of 2, 5 mm in diameter, according to the invention.

  Figure 2 shows a perspective view of a FRS-screw screw of 3 mm in size.

  FIG. 3 represents the end of a screwdriver according to the invention adapted to the two screws of FIGS. 1 and 2.

  FIG. 4 represents an axial sectional view of a screw according to FIG. 1.

  Reference is first made to FIG.

  There is shown on this screw, a screw type FRS-Screw in accordance with patent EP 1 273 273.

  This screw has a threaded head or proximal portion 1 and a distal portion also threaded 2, the threads of the parts 1 and 2 terminating, at their respective distal ends, by self-tapping and self-drilling notches visible in the drawing. . The threaded portion 2 is connected to the threaded portion 1 by a short unthreaded portion 3 due to machining constraints.

  As seen, the screw is traversed by an axial channel 4, in the form of a cannula, having a diameter of about 1 mm.

  The pitch of the threads of parts 1 and 2 are different, the pitch of the proximal portion 1 being less than the pitch 2 of the distal portion. The sections of the nets may be any. The outer diameter or diameter of the crests of the distal threaded portion is 2.5 mm while the diameter of the crests of the proximal portion 1 is slightly larger in diameter.

  The screw shown has in its proximal portion a hexagonal recess 5 centered axially on the cannula 4.

  The proximal end of the proximal portion further has two diametrically opposed through-slots 6, having a radial dimension of about 1 mm and an axial depth of about 1 mm. The screw of Figure 1 may have, for example, a variable length as required.

  In Figure 2, there is shown a screw similar to that of Figure 1 but distinguished by a diameter of the crests of the threads of the distal portion, which is 3 mm and a diameter of the proximal thread crests which is slightly larger? . On the other hand, the hexagonal recess 5 and the slots 6 have identical dimensions to those described in FIG. 1, the radial dimension of the slots being a little larger.

  Referring to Figure 3, we see the end of a screwdriver for screwing indifferently the screws of Figures 1 and 2. This screwdriver has a hexagonal end 7 complementary to the hexagonal recess 5, the hexagonal end of screwdriver, having an internal channel 8 of the same diameter as the cannula 4. At a distance from the distal end of the screwdriver substantially equal to the depth of the cavity 4 in the axial direction, less the axial depth of the notches 6, the screwdriver has two diametrically opposite longitudinal ribs 9 whose widths are complementary to the widths of the notches 6.

  The total diameter of the screwdriver joining the two opposite notches 58 is preferably provided not to exceed the diameter of the peaks of the proximal threads of the proximal portion 1 of the screw of FIG.

  To introduce and place, in a bone part, the screw, which has just been described, the surgeon, after having drilled the bone part (s) and having introduced into these a guide rod, slides on the rod of first the screw then the screwdriver and introduces the hexagonal end of the screwdriver into the recess 5 so that the two ribs 9 penetrate and immobilize in the notches 6.

He can then proceed to screwing.

  In a torsion resistance test, the maximum resistance torque of the screws according to the invention has been compared to identical screws whose hexagonal impressions are devoid of notches. The increase in resistance can reach values of the order of 60 to 90%.

  The risk of breakage during screwing has thus been extremely reduced, as is the risk of skidding of the hexagonal screwdriver in its footprint.

Claims (12)

  1. Implantable surgical screw, intended in particular to be screwed into bone or bone fragments and having, at its proximal end, a polygonal cavity (5) female, characterized in that it further comprises at least one groove radial (6) extending from the polygonal impression (5) towards the periphery of the proximal part of the screw, these radial grooves (6) being intended to cooperate with one or more complementary reliefs presented by a screwdriver or screwdriver having a polygonal portion complementary to the impression of the screw, from which extend said complementary reliefs.
  2. Screw according to claim 1, characterized in that said grooves (6) are two in number and diametrically opposed.
  3. Screw according to one of claims 1 and 2, characterized in that the proximal portion of the screw has a recess forming the polygonal cavity (5) female, the radial grooves (6) being formed of radial female notches arranged in the upper edge of the obviously.
  4. Screw according to one of claims 1 to 3, characterized in that the polygonal impression (5) is hexagonal.
  5. Screw according to one of claims 1 to 4, characterized in that it has a maximum diameter less than or equal to 4 mm.
  6. Screw according to claim 5, characterized in that it has a threaded proximal portion and a threaded distal portion of smaller diameter.
  7. Screw according to one of claims 1 to 6, characterized in that it has a channel forming a cannula (4).
  8. Screw according to one of claims 1 to 7, characterized in that it is arranged to be self-tapping.
  9. Screw according to one of claims 1 to 8, characterized in that it is arranged to be self-drilling.
  10. Screw according to one of claims 1 to 9, characterized in that it has a distal thread of smaller diameter and a proximal thread of larger diameter, the pitch of the two threads being different, especially smaller for threading proximal, which makes it possible to exercise a compression
11. Screw type FRS-Screw according to claim 10, characterized in that it is cannulated and has, at the head of the proximal and distal threads, self-drilling notches.
  Screwdriver according to one of claims 1 to 11, characterized in that it has a polygonal portion (7) complementary to the polygonal cavity (5) of the screw, and one or more radial reliefs (9). complementary or radial grooves (6) of the screw.
FR0411368A 2004-10-25 2004-10-25 Improvement to implantable surgical screws Pending FR2876897A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0411368A FR2876897A1 (en) 2004-10-25 2004-10-25 Improvement to implantable surgical screws

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0411368A FR2876897A1 (en) 2004-10-25 2004-10-25 Improvement to implantable surgical screws
PCT/FR2005/002664 WO2006045950A1 (en) 2004-10-25 2005-10-25 Improvement of surgical implant screws

Publications (1)

Publication Number Publication Date
FR2876897A1 true FR2876897A1 (en) 2006-04-28

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Family Applications (1)

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Country Status (2)

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FR (1) FR2876897A1 (en)
WO (1) WO2006045950A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012141715A1 (en) * 2011-04-15 2012-10-18 Synthes Usa, Llc Fixation assembly
US8882775B2 (en) 2011-04-15 2014-11-11 DePuy Synthes Products, LLC Fixation assembly

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4175555A (en) 1977-02-24 1979-11-27 Interfix Limited Bone screw
US5019079A (en) 1989-11-20 1991-05-28 Zimmer, Inc. Bone screw
WO1991009572A1 (en) 1989-12-21 1991-07-11 Bakinsky Nauchno-Issledovatelsky Institut Travmatologii I Ortopedii Compressing screw for osteosynthesis
EP0491211A1 (en) 1990-12-19 1992-06-24 Synthes AG, Chur Bone screw
WO1993015682A1 (en) 1992-02-14 1993-08-19 American Cyanamid Company Polymeric screws and coatings for surgical uses
EP0695537A1 (en) 1994-07-05 1996-02-07 Amp Developpement Threaded head screw device for setting two bone fragments
FR2735677A1 (en) * 1995-06-26 1996-12-27 Landanger Landos Screwdriver and screw assembly indicated to the maxillofacial microsurgery type
WO2000059389A1 (en) * 1999-04-02 2000-10-12 Osteotech, Inc. Surgical bone screw
EP1101459A2 (en) * 1999-11-15 2001-05-23 Arthrex, Inc. Tapered bioabsorbable interference screw for endosteal fixation of ligaments
US20010004694A1 (en) * 1998-04-14 2001-06-21 Joseph Edward Carchidi Apparatus for rigidly fixing craniomaxillofacial tissue grafts and bone plates
EP1273273A2 (en) 2001-07-05 2003-01-08 Louis Samuel Barouk Self-tapping screw for small-bone surgery
WO2004058081A1 (en) * 2002-12-20 2004-07-15 High Plains Technology Group, Llc Bone screw fastener and apparatus for inserting and removing same

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4175555A (en) 1977-02-24 1979-11-27 Interfix Limited Bone screw
US5019079A (en) 1989-11-20 1991-05-28 Zimmer, Inc. Bone screw
WO1991009572A1 (en) 1989-12-21 1991-07-11 Bakinsky Nauchno-Issledovatelsky Institut Travmatologii I Ortopedii Compressing screw for osteosynthesis
EP0491211A1 (en) 1990-12-19 1992-06-24 Synthes AG, Chur Bone screw
WO1993015682A1 (en) 1992-02-14 1993-08-19 American Cyanamid Company Polymeric screws and coatings for surgical uses
EP0695537A1 (en) 1994-07-05 1996-02-07 Amp Developpement Threaded head screw device for setting two bone fragments
FR2735677A1 (en) * 1995-06-26 1996-12-27 Landanger Landos Screwdriver and screw assembly indicated to the maxillofacial microsurgery type
US20010004694A1 (en) * 1998-04-14 2001-06-21 Joseph Edward Carchidi Apparatus for rigidly fixing craniomaxillofacial tissue grafts and bone plates
WO2000059389A1 (en) * 1999-04-02 2000-10-12 Osteotech, Inc. Surgical bone screw
EP1101459A2 (en) * 1999-11-15 2001-05-23 Arthrex, Inc. Tapered bioabsorbable interference screw for endosteal fixation of ligaments
EP1273273A2 (en) 2001-07-05 2003-01-08 Louis Samuel Barouk Self-tapping screw for small-bone surgery
WO2004058081A1 (en) * 2002-12-20 2004-07-15 High Plains Technology Group, Llc Bone screw fastener and apparatus for inserting and removing same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012141715A1 (en) * 2011-04-15 2012-10-18 Synthes Usa, Llc Fixation assembly
US8882775B2 (en) 2011-04-15 2014-11-11 DePuy Synthes Products, LLC Fixation assembly
US9138279B2 (en) 2011-04-15 2015-09-22 DePuy Synthes Products, Inc. Fixation assembly

Also Published As

Publication number Publication date
WO2006045950A1 (en) 2006-05-04

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