CA2466015A1 - Device for rotational stabilization of bone segments - Google Patents

Device for rotational stabilization of bone segments Download PDF

Info

Publication number
CA2466015A1
CA2466015A1 CA002466015A CA2466015A CA2466015A1 CA 2466015 A1 CA2466015 A1 CA 2466015A1 CA 002466015 A CA002466015 A CA 002466015A CA 2466015 A CA2466015 A CA 2466015A CA 2466015 A1 CA2466015 A1 CA 2466015A1
Authority
CA
Canada
Prior art keywords
locking collar
bone
lag screw
bone plate
distal 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
CA002466015A
Other languages
French (fr)
Other versions
CA2466015C (en
Inventor
Harry Thomas Hall Iv
Jeffrey M. Tessier
Josef Peter Kaufmann
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 CA2466015A1 publication Critical patent/CA2466015A1/en
Application granted granted Critical
Publication of CA2466015C publication Critical patent/CA2466015C/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
    • A61B17/74—Devices for the head or neck or trochanter of the femur
    • A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
    • A61B17/746—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck the longitudinal elements coupled to a plate opposite the femoral head
    • 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
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8033—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
    • A61B17/8047—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers wherein the additional element surrounds the screw head in the plate hole
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S606/00—Surgery
    • Y10S606/902—Cortical plate specifically adapted for a particular bone

Abstract

A device for rotational stabilization of bone segments comprising a bone plate (10), a bone lag screw (18), and a locking collar (50). The bone lag screw (18) has a bone-engagement end (20), a distal end, and a keyed cross-sectional profile (32), the bone-engagement end (20) configured for engaging a first bone segment. The bone plate (10) has a flat portion (12) for engaging a second bone segment and a barrel portion (14) having an internal bore for slidably receiving the lag screw (18). The locking collar (50) has a keyed internal profile (21) that mates with the keyed cross- sectional profile (32) of the lag screw (18) to rotationally couple the locking collar (50) and the lag screw (18) when the lag screw (18) is inserted through the locking (collar50) , and an outer surface configured and dimensioned for free rotation, in a first position, within the internal bore (16) of the bone plate barrel portion (14) and frictionally engaging, in a second position, the internal bore (16) of the bone plate barrel portion (14) to resist or prevent rotation of the collar (50) relative to the bone plate (10), and thereby resist or prevent rotation of the lag screw (18) relative to the bone plate (10). The frictional engagement is achieved by a deformation of the distal end (56) of the locking collar (50) within the internal bore (16) of the bone plate (10). This deformation is achieved by the application of force to the collar in the proximal direction.

Claims (33)

1. A device for rotational stabilization of bone segments comprising:
a bone lag screw having a bone-engagement end, a distal end, and a keyed cross-sectional profile, the bone-engagement end configured for engaging a first bone segment;
a bone plate having a flat portion for engaging a second bone segment and a barrel portion having an internal bore for slidably receiving the lag screw; and a locking collar having a proximal end, a distal end, a keyed internal profile and a deformable portion at the distal end;
wherein the keyed internal profile mates with the keyed cross-sectional profile of the lag screw to rotationally couple the locking collar and the lag screw when the lag screw is inserted through the locking collar, and the deformable portion is configured and dimensioned for (1) free rotation, in a first position, within the internal bore of the bone plate barrel portion and (2) fractionally engaging, in a second position, the internal bore of the bone plate barrel portion to resist or prevent rotation of the collar relative to the bone plate, and thereby resist or prevent rotation of the lag screw relative to the bone plate.
2. The device of claim 1, wherein the locking collar, in the second position, is fractionally engaged in the internal bore of the bone plate by deformation of the deformable portion within the internal bore of the bone plate.
3. The device of claim 2, wherein the deformation of the deformable portion of the locking collar within the internal bore of the bone plate is achieved by application of a force on the locking collar in a proximal direction.
4. The device of claim 3, wherein the deformable portion has a maximum diameter at the distal end of the locking collar.
5. The device of claim 4, wherein the deformable portion tapers from the distal end of the locking collar toward the proximal end of the locking collar.
6. The device of claim 5, wherein the locking collar has a longitudinal axis and the tapered, deformable portion forms an angle of about 20° with the longitudinal axis.
7. The device of claim 6, wherein the deformable portion includes a plurality of deformable tabs extending part of the distance from the distal end of the locking collar toward the proximal end of the locking collar.
8. The device of claim 7, wherein the deformable tabs have flat portions at the distal end of the locking collar and taper toward the proximal end of the locking collar.
9. The device of claim 7, wherein the distal end of the locking collar has a circumference, and the plurality of deformable tabs are spaced about the circumference.
10. The device of claim 7, wherein the locking collar, in the second position, is fractionally engaged in the internal bore of the bone plate by deformation of the deformable tabs.
11. The device of claim 4, wherein the internal bore of the bone plate barrel portion has a diameter, and the maximum diameter of the deformable portion, when the collar is in the first position, is greater than the diameter of the internal bore.
12. The device of claim 1, wherein the locking collar is substantially cylindrical.
13. The device of claim 1, wherein the barrel portion of the bone plate is angled relative to the flat portion, the first bone segment is the femoral head, the second bone segment is the femoral shaft, and the device is configured and adapted for repair of fractures of the femoral neck.
14. The device of claim 1, wherein the lag screw is formed with a cancellous screw thread.
15. The device of claim 1, wherein the lag screw is formed with a plurality of helically twisted blades.
16. The device of claim 1, wherein the lag screw, bone plate, and locking collar are formed of stainless steel, titanium alloy, or titanium.
17. The device of claim 1, further comprising:
a threaded bore in the distal end of the lag screw; and a compression screw insertable into the threaded bore of the lag screw.
18. The device or claim 17, wherein the compression screw, when threaded into the threaded bore of the lag screw, abuts a distal end of the locking collar and draws the lag screw in an axial direction to join the two bone segments.
19. The device of claim 17, wherein the compression screw is formed of stainless steel, titanium alloy, or titanium.
20. A device for rotational stabilization of bone segments comprising:
a bone lag screw having a bone-engagement end, a distal end, and a keyed cross-sectional profile, the bone-engagement end configured for engaging a first bone segment;
a bone plate having a flat portion for engaging a second bone segment and a barrel portion having an internal bore for slidably receiving the lag screw; and a substantially cylindrical locking collar having a proximal end, a distal end, a hollowed cylindrical interior, a keyed internal profile and a plurality of deformable tabs at the distal end;
wherein the keyed internal profile mates with the keyed cross-sectional profile of the lag screw to rotationally couple the locking collar and the lag screw when the lag screw is inserted through the locking collar, and the locking collar is configured and dimensioned for (1) free rotation, in a first position, within the internal bore of the bone plate barrel portion and (2) frictionally engaging, in a second position, the internal bore of the bone plate barrel portion to resist or prevent rotation of the collar relative to the bone plate, and thereby resist or prevent rotation of the lag screw relative to the bone plate.
21. The device of claim 20, wherein the locking collar has a maximum diameter at its distal end.
22. The device of claim 21, wherein each of the deformable tabs has a flat portion at the distal end of the locking collar and tapers from the flat portion toward the proximal end of the locking collar.
23. The device of claim 22, wherein the locking collar has a longitudinal axis and the deformable tabs taper at 20° to the longitudinal axis.
24. The device of claim 20, wherein the distal end of the locking collar has a circumference, and the plurality of deformable tabs are spaced about the circumference.
25. The device of claim 21, wherein the internal bore of the bone plate barrel portion has a diameter, and the maximum diameter of the locking collar, when the collar is in the first position, is greater than the diameter of the internal bore.
26. The device of claim 20, wherein the locking collar, in the second position, is frictionally engaged in the internal bore of the bone plate by deformation of the deformable tabs within the internal bore of the bone plate.
27. The device of claim 26, wherein the deformation of the deformable tabs of the locking collar within the internal bore of the bone plate is achieved by application of a force on the locking collar in a proximal direction.
28. The device of claim 20, wherein the barrel portion of the bone plate is angled relative to the flat portion, the first bone segment is the femoral head, the second bone segment is the femoral shaft, and the device is configured and adapted for repair of fractures of the femoral neck.
29. The device of claim 20, wherein the lag screw, bone plate, and locking collar are formed of stainless steel, titanium alloy, or titanium.
30. The device of claim 20, further comprising:

a threaded bore in the distal end of the lag screw; and a compression screw insertable into the threaded bore of the lag screw.
31. The device of claim 30, wherein the compression screw, when threaded into the threaded bore of the lag screw, abuts a distal end of the locking collar and draws the lag screw in an axial direction to join the two bone segments.
32. The device of claim 30, wherein the compression screw is formed of a stainless steel, titanium alloy, or titanium.
33. The device of claim 20, further comprising a circumferential groove at a distal end of the internal bore of the bone plate barrel portion which engages the distal end of the locking collar such that the collar freely rotates within the internal bore of the barrel in the first position.
CA2466015A 2001-10-01 2002-09-30 Device for rotational stabilization of bone segments Expired - Lifetime CA2466015C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/968,562 2001-10-01
US09/968,562 US6645209B2 (en) 2000-04-04 2001-10-01 Device for rotational stabilization of bone segments
PCT/US2002/030929 WO2003028567A1 (en) 2001-10-01 2002-09-30 Device for rotational stabilization of bone segments

Publications (2)

Publication Number Publication Date
CA2466015A1 true CA2466015A1 (en) 2003-04-10
CA2466015C CA2466015C (en) 2011-04-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2466015A Expired - Lifetime CA2466015C (en) 2001-10-01 2002-09-30 Device for rotational stabilization of bone segments

Country Status (15)

Country Link
US (1) US6645209B2 (en)
EP (1) EP1434532B1 (en)
JP (1) JP4215640B2 (en)
CN (1) CN1271975C (en)
AR (1) AR036664A1 (en)
AT (1) ATE362344T1 (en)
AU (1) AU2002343453B2 (en)
BR (1) BR0213044B1 (en)
CA (1) CA2466015C (en)
CO (1) CO5570644A2 (en)
DE (1) DE60220175T2 (en)
ES (1) ES2286300T3 (en)
MX (1) MXPA04002956A (en)
WO (1) WO2003028567A1 (en)
ZA (1) ZA200401644B (en)

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Also Published As

Publication number Publication date
US20020049445A1 (en) 2002-04-25
CO5570644A2 (en) 2005-10-31
CA2466015C (en) 2011-04-12
WO2003028567A1 (en) 2003-04-10
JP4215640B2 (en) 2009-01-28
EP1434532B1 (en) 2007-05-16
DE60220175D1 (en) 2007-06-28
DE60220175T2 (en) 2008-01-17
CN1271975C (en) 2006-08-30
CN1561182A (en) 2005-01-05
ES2286300T3 (en) 2007-12-01
US6645209B2 (en) 2003-11-11
AU2002343453B2 (en) 2005-04-14
BR0213044A (en) 2004-10-05
MXPA04002956A (en) 2004-07-05
BR0213044B1 (en) 2012-06-12
AR036664A1 (en) 2004-09-22
EP1434532A1 (en) 2004-07-07
ATE362344T1 (en) 2007-06-15
ZA200401644B (en) 2004-09-01
JP2005504581A (en) 2005-02-17

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