CA2526384A1 - Bone screw - Google Patents

Bone screw Download PDF

Info

Publication number
CA2526384A1
CA2526384A1 CA002526384A CA2526384A CA2526384A1 CA 2526384 A1 CA2526384 A1 CA 2526384A1 CA 002526384 A CA002526384 A CA 002526384A CA 2526384 A CA2526384 A CA 2526384A CA 2526384 A1 CA2526384 A1 CA 2526384A1
Authority
CA
Canada
Prior art keywords
sleeve
bone screw
diameter
shaft
thread
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
CA002526384A
Other languages
French (fr)
Other versions
CA2526384C (en
Inventor
Andre Schlienger
Peter Senn
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
Synthes (U.S.A.)
Andre Schlienger
Peter Senn
Synthes Usa, Llc
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 (U.S.A.), Andre Schlienger, Peter Senn, Synthes Usa, Llc filed Critical Synthes (U.S.A.)
Publication of CA2526384A1 publication Critical patent/CA2526384A1/en
Application granted granted Critical
Publication of CA2526384C publication Critical patent/CA2526384C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • A61B17/686—Plugs, i.e. elements forming interface between bone hole and implant or fastener, e.g. screw
    • 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
    • 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
    • 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
    • A61B17/72—Intramedullary pins, nails or other devices
    • A61B17/7233—Intramedullary pins, nails or other devices with special means of locking the nail to the bone
    • A61B17/7241—Intramedullary pins, nails or other devices with special means of locking the nail to the bone the nail having separate elements through which screws pass
    • 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
    • A61B17/7233—Intramedullary pins, nails or other devices with special means of locking the nail to the bone
    • A61B17/725—Intramedullary pins, nails or other devices with special means of locking the nail to the bone with locking pins or screws of special form
    • 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

Abstract

The invention relates to a bone screw (1) which comprises a shank (3) carrying a screw thread (2), and a front end (4) and a rear end (5). The external diameter "d" or the minor diameter "k" of the screw thread (2), in a center area (L4) of the shank (3), tapers from a larger dimension "d2" or "k2"
towards the front end (4) to a smaller dimension "d1" or "k1", whereby "d1"
and "k1" are unequal zero. The shank (3) is provided with a concentric, radially expandable sleeve (10). Said sleeve is positioned on the very part of the shank (3) which has the smaller external diameter "d1" or "k1".

Claims (19)

1. Bone screw (1) with a shaft (3) carrying a thread (2), a front end (4) and a rear end (5), the external diameter "d" of the thread (2) or the core diameter "k"
of the shaft (3) tapering in a middle region (L4) of the shaft (3) from a larger dimension "d2" or "k2" respectively towards the front end (4) to a smaller dimension "dl" or "kl" respectively, "dl" and "kl" not being equal to zero, characterized in that A) the shaft (3) is provided with a concentrically disposed, radially expandable sleeve (10), B) the sleeve (10) being positioned on that part of the shaft (3), which has the smaller external diameter "dl ".
2. The bone screw (1) of claim 1, characterized in that the thread (2) has a constant depth and that the diameter of the core (7) of the shaft (3) decreases in the middle region (L4) in the direction of the front end (4) from a larger value "k2" to a smaller value "k1" without assuming the value of zero.
3. The bone screw (1) of claims 1 on 2, characterized in that the sleeve (10) has an internal thread (13).
4. The bone screw (1) of one of the claims 1 to 3, characterized in that the sleeve (10) has at least one longitudinal slot (11).
5. The bone screw (1) of one of the claims 1 to 4, characterized in that the longitudinal slot (11) extends over the whole height of the sleeve (10).
6. The bone screw (1) of one of the claims 1 to 4, characterized in that the longitudinal slot (11) extends only over a portion of the height of the sleeve (10).
7. The bone screw (1) of claims 6, characterized in that several longitudinal slots (11) are present and preferably are open alternately at the top and at the bottom.
8. The bone screw (1) of one of the claims 1 to 7, characterized in that the sleeve (10) with the diameter DH has a peripheral, encircling flange (12) with an enlarged diameter D F > D H at one of its ends.
9. The bone screw (1) of one of the claims 1 to 8, characterized in that the sleeve (10) consists of a non-absorbable plastic, preferably of PEEK.
10. The bone screw (1) of one of the claims 1 to 8, characterized in that the sleeve (10) consists of a metallic material.
11. The bone screw off on the claims 1 to 8, characterized in that the sleeve (10) consists of a bio-absorbable plastic.
12. The bone screw of one of the claims 1 to 11, characterized in that a shaft part (8) is disposed in the region "L2" with an enlarged external diameter d3 > d2 between the end (5) of the bone screw (1) and that part of the shaft (3) with an enlarged diameter d3 > d2.
13. The bone screw (1) of claim 12, characterized in that the shaft part (8) is provided with an external diameter d3 > d2 with an external thread (9) in the region "L2".
14. Device for bone fixation, comprising one or more bone screws (1) of one of the claims one to 13 with a medullary pin (20), characterized in that the medullary pin (20) has the diameter DN and a transverse borehole (22) extending transversely to its longitudinal axis, the transverse borehole having a diameter D B, which is larger than d2 as well as larger than d B-15.
15. The device (1) of claim 14, characterized in that the diameter D H of the sleeve (10) fulfills the condition that D H <= 1.2D B.
16. The device (1) of claims 14 or 15, characterized in that the length H L of the sleeve (10) is more than 1.5D N.
17. The device (1) of one of the claims 14 to 16, characterized in that the length H L of the sleeve (10) is greater than 0.2D N.
18. The device (1) of one of the claims 14 to 17, characterized in that the medullary pin (20) has a continuous cannulation (23) and a wall thickness W N.
19. The device (1) of claim 18, characterized in that the length H L of the sleeve (10) corresponds to the wall thickness W N of the medullary pin (20).
CA2526384A 2004-02-23 2004-02-23 Bone screw Expired - Lifetime CA2526384C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2004/000095 WO2005079685A1 (en) 2004-02-23 2004-02-23 Bone screw

Publications (2)

Publication Number Publication Date
CA2526384A1 true CA2526384A1 (en) 2005-09-01
CA2526384C CA2526384C (en) 2012-05-29

Family

ID=34866039

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2526384A Expired - Lifetime CA2526384C (en) 2004-02-23 2004-02-23 Bone screw

Country Status (13)

Country Link
US (2) US8162998B2 (en)
EP (1) EP1718229B1 (en)
JP (1) JP4863885B2 (en)
KR (1) KR101085711B1 (en)
CN (1) CN1913839B (en)
AT (1) ATE390893T1 (en)
BR (1) BRPI0418311B8 (en)
CA (1) CA2526384C (en)
DE (1) DE502004006741D1 (en)
ES (1) ES2301972T3 (en)
PL (1) PL212656B1 (en)
TW (1) TWI346544B (en)
WO (1) WO2005079685A1 (en)

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Publication number Priority date Publication date Assignee Title
US10383739B2 (en) 2011-11-30 2019-08-20 Smith & Nephew, Inc. Orthopaedic implant with dynamic trans-fixation slot

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ATE390893T1 (en) 2008-04-15
TWI346544B (en) 2011-08-11
PL380240A1 (en) 2007-01-08
US9011440B2 (en) 2015-04-21
US20120203226A1 (en) 2012-08-09
BRPI0418311A (en) 2008-06-10
TW200528062A (en) 2005-09-01
PL212656B1 (en) 2012-11-30
EP1718229A1 (en) 2006-11-08
DE502004006741D1 (en) 2008-05-15
US8162998B2 (en) 2012-04-24
ES2301972T3 (en) 2008-07-01
WO2005079685A1 (en) 2005-09-01
BRPI0418311B8 (en) 2021-06-22
BRPI0418311B1 (en) 2015-05-05
EP1718229B1 (en) 2008-04-02
CN1913839A (en) 2007-02-14
KR20070032280A (en) 2007-03-21
CA2526384C (en) 2012-05-29
CN1913839B (en) 2010-04-28
US20060095040A1 (en) 2006-05-04
JP2007522846A (en) 2007-08-16
KR101085711B1 (en) 2011-11-21
JP4863885B2 (en) 2012-01-25
AU2004316051A1 (en) 2005-09-01

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