CA2574838A1 - Screw - Google Patents

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Publication number
CA2574838A1
CA2574838A1 CA002574838A CA2574838A CA2574838A1 CA 2574838 A1 CA2574838 A1 CA 2574838A1 CA 002574838 A CA002574838 A CA 002574838A CA 2574838 A CA2574838 A CA 2574838A CA 2574838 A1 CA2574838 A1 CA 2574838A1
Authority
CA
Canada
Prior art keywords
screw
central line
tip
core
head end
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.)
Granted
Application number
CA002574838A
Other languages
French (fr)
Other versions
CA2574838C (en
Inventor
Andre Schlienger
Peter Senn
Markus Buettler
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.)
Synthes USA LLC
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2574838A1 publication Critical patent/CA2574838A1/en
Application granted granted Critical
Publication of CA2574838C publication Critical patent/CA2574838C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/041—Specially-shaped shafts
    • 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
    • A61B17/72—Intramedullary pins, nails or other devices
    • 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
    • A61B17/8635—Tips of 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
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B2017/8655—Pins or screws or threaded wires; nuts therefor with special features for locking in the bone

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Surgery (AREA)
  • Molecular Biology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Neurology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Surgical Instruments (AREA)
  • Heterocyclic Compounds That Contain Two Or More Ring Oxygen Atoms (AREA)
  • Materials For Medical Uses (AREA)
  • Polyesters Or Polycarbonates (AREA)

Abstract

The invention relates to a screw (1) comprising a head-side end (5), a tip (6), a screw core (3) comprising an envelope surface (14) carrying an outer thread (7), and a central line (4) formed by the connection line of the centres of gravity of the axially successive, orthogonal cross-sectional surfaces of the screw core (3), without taking into account any cavities (13).
The screw core (3) comprises at least one cavity and the central line is not straight. The material weakening of the screw core (3), caused by the cavities (13), simplifies the passage thereof through a narrow point, e.g. in a transversal borehole of an intramedullary nail (10), as the screw (1) without a straight central line can be radially deformed to a certain degree.

Claims (28)

1. Screw (1) with a head end (5), a tip (6), a screw core (3) with one or more cavities (13) and with circumferential surface (14), which carries an external thread (7), as well as a central line (4), which is not rectilinear and is formed by the line connecting the centers of gravity of the axially successive, orthogonal cross-sectional surfaces of the screw core (3), disregarding any cavities (13) and disregarding the external thread (7), characterized in that the central line (4), extending between the head end (5) and the tip (6), has the length L and is divided into three sections A, B and C, A) section A extending from the head end (5) by the amount of 0.10 L to 0.25 L in the direction of the tip (6), B) section B extending from the tip (6) by the amount of 0.10 to 0.25 L in the direction of the head end (5), C) section C extending between the two sections A and B with the proviso that the length C = (L - A- B) and D) the central line (4) in the sections A and B being essentially rectilinear and extending coaxially with one another.
2. The screw (1) of claim 1, characterized in that the screw core (3) has a cavity (13) in the form of an axial cannulation, which passes through the screw (1) preferably continuously.
3. The screw (1) of claims 1 or 2, characterized in that the central line (4) proceeds helically or spirally.
4. The screw of claims 1 or 2, characterized in the central line (4) lies in one plane.
5. The screw (1) of one of the claims 1 to 4, characterized in that a marking is provided at the head end (5) of the screw (1).
6. The screw (1) of claim 5, characterized in that the marking marks the orientation of the plane, in which any points of inflection of the central line (4) are located, is marked.
7. The screw (1) of one of the claims 1 to 3, characterized in that the central line (4) does not lie in one plane.
8. The screw (1) of claims 1 or 2, characterized in that the central line (4) is formed from several straight lines, which are misaligned with one another.
9. The screw (1) of one of the claims 1 to 8, characterized in that the circumferential surface (14) is not formed from a family of parallel straight lines.
10. The screw (1) of one of the claims 1 to 9, characterized in that the volume V hohl of the screw core (3), having one or more cavities (13), is less than 95% of the volume V voll of the body enclosed by the circumferential surface (14) of the screw core (3).
11. The screw (1) of claim 10, characterized in that V hohl < 0.90 V voll and preferably that V hohl < 0.80 V voll.
12. The screw (1) of one of the claims 1 to 11, characterized in that the cavities (13), excluding any axial outlet of a cavity (13) at a tip (6), penetrate not more than 1% and preferably 0% of the circumferential surface (14).
13. The screw (1) of one of the claims 1 to 12, characterized in that its tip (6) is tapered.
14. The screw (1) of one of the claims 1 to 13, characterized in that the head end (5) has means (8) for driving the screw (1).
15. The screw (1) of one of the claims 1 to 14, characterized in that the screw core (3) does not have an axis of rotational symmetry.
16. The screw (1) of one of the claims 1 to 15, characterized in that a straight line (15), extending between the center of the head end (5) and the center of the tip (6), is at a distance of x > 0 from the center line (4) at least in places.
17. The screw (1) of claim 16, characterized in that the external thread (7) has the diameter "d" and the distance "x" fulfills the condition that 0.02 d < x < 0.6 d and preferably that 0.1 d < x < 0.4 d.
18. The screw (1) of claims 16 or 17, characterized in that the distance "x" is greater than 0.05 mm and preferably greater than 0.50 mm at least on a partial axial segment.
19. The screw (1) of one of the claims 1 to 19, characterized in that the central line (4) is curved S-shaped or is eccentric preferably only in section C.
20. The screw (1) of one of the claims 1 to 19, characterized in that the central line (4) has a point of inflection (11) preferably only in section C.
21. The screw (1) of one of the claims 1 to 20, characterized in that the central line (4) has two points of inflection (11; 12) at a distance of y from one another preferably only in section C.
22. The screw (1) of one of the claims 2 to 21, characterized in that the thickness W of the wall of the screw core (3) in the region of the cannulation is greater than 0.05 d and preferably greater than 0.1 d.
23. The screw (1) of one of the claims 2 to 22, characterized in that the thickness W of the wall of the screw core (3) in the region of the cannulation is smaller than 0.8 d and preferably smaller than 0.6 d.
24. Use of a screw (1) of one of the claims 1 to 23 together with a locking intramedullary nail (10), which has at least one transverse borehole (9), characterized in that the transverse borehole (9) has a cross-sectional profile P
with a maximum extent "a", measured in the direction of the central line (4), and a maximum extent "b", measured perpendicularly to "a", with the proviso, on the one hand, that a > b and, on the other, that a > d < b.
25. The use of claim 24, characterized in that a cross-sectional profile P is circular with a = b and, furthermore, in that the condition that 0.70 b <
d < 0.95b and preferably that 0.8 b < d < 0.9b is fulfilled.
26. The use of claims 24 or 25, characterized in that the distance x fulfills the condition that x < (b - d + 1 mm), "b" being the diameter of the transverse borehole (9) in millimeters and "d" the diameter of the external thread (7) in millimeters.
27. The use of one of the claims 25 to 27, characterized in that the distance x fulfills the condition that 0.05(b - d) < x < 0.35(b - d) and preferably the condition that 1.5(b - d) < x < 2.2(b - d), "d" being the diameter of the external thread (7) in millimeters.
28. The use according to one of the claims 25 to 27, characterized in that the distance y between two adjacent points of inflection (11; 12) fulfills essentially the condition that D = ny, n being an odd number and D the diameter of the intramedullary nail.
CA2574838A 2004-07-23 2004-07-23 Screw Expired - Fee Related CA2574838C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2004/000469 WO2006007739A1 (en) 2004-07-23 2004-07-23 Screw

Publications (2)

Publication Number Publication Date
CA2574838A1 true CA2574838A1 (en) 2006-01-26
CA2574838C CA2574838C (en) 2012-10-02

Family

ID=34958034

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2574838A Expired - Fee Related CA2574838C (en) 2004-07-23 2004-07-23 Screw

Country Status (5)

Country Link
EP (1) EP1771119B1 (en)
AT (1) ATE418926T1 (en)
CA (1) CA2574838C (en)
DE (1) DE502004008801D1 (en)
WO (1) WO2006007739A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8133261B2 (en) 2007-02-26 2012-03-13 Depuy Spine, Inc. Intra-facet fixation device and method of use
US8043334B2 (en) 2007-04-13 2011-10-25 Depuy Spine, Inc. Articulating facet fusion screw
US8197513B2 (en) 2007-04-13 2012-06-12 Depuy Spine, Inc. Facet fixation and fusion wedge and method of use
US8894685B2 (en) 2007-04-13 2014-11-25 DePuy Synthes Products, LLC Facet fixation and fusion screw and washer assembly and method of use
US9044277B2 (en) 2010-07-12 2015-06-02 DePuy Synthes Products, Inc. Pedicular facet fusion screw with plate
US9381048B2 (en) 2011-08-31 2016-07-05 DePuy Synthes Products, Inc. Devices and methods for cervical lateral fixation
EP2868935A1 (en) 2013-11-05 2015-05-06 HILTI Aktiengesellschaft Screw, building cladding and insulating method
CN105213005A (en) * 2015-10-23 2016-01-06 成都市南丁医用材料有限公司 Medical absorbable internal fixtion rivet

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3391720A (en) * 1966-10-12 1968-07-09 Morse Milton Spiral shaped threaded locking fastener
FR2704140B3 (en) * 1992-11-02 1995-04-21 Hubin Claude Ligament screw, intended to fix a flexible fiber transplant in a bone tunnel.
WO2000063566A1 (en) * 1999-04-21 2000-10-26 Hanstock Fasteners Pty Ltd Self aligning screw fasteners and engagement thereof
US6565573B1 (en) * 2001-04-16 2003-05-20 Smith & Nephew, Inc. Orthopedic screw and method of use
EP1610701B1 (en) * 2003-03-28 2007-10-31 Synthes GmbH Locking screw

Also Published As

Publication number Publication date
EP1771119A1 (en) 2007-04-11
EP1771119B1 (en) 2008-12-31
WO2006007739A1 (en) 2006-01-26
ATE418926T1 (en) 2009-01-15
DE502004008801D1 (en) 2009-02-12
CA2574838C (en) 2012-10-02

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Legal Events

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EEER Examination request
MKLA Lapsed

Effective date: 20160725

MKLA Lapsed

Effective date: 20160725