CA2630494A1 - Single action anti-torque rod reducer - Google Patents

Single action anti-torque rod reducer Download PDF

Info

Publication number
CA2630494A1
CA2630494A1 CA002630494A CA2630494A CA2630494A1 CA 2630494 A1 CA2630494 A1 CA 2630494A1 CA 002630494 A CA002630494 A CA 002630494A CA 2630494 A CA2630494 A CA 2630494A CA 2630494 A1 CA2630494 A1 CA 2630494A1
Authority
CA
Canada
Prior art keywords
housing
bone screw
head
sleeve
connecting rod
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
CA002630494A
Other languages
French (fr)
Other versions
CA2630494C (en
Inventor
Scott A. Jones
Andy Rock
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.)
K2M Inc
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 CA2630494A1 publication Critical patent/CA2630494A1/en
Application granted granted Critical
Publication of CA2630494C publication Critical patent/CA2630494C/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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7083—Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements
    • A61B17/7086—Rod reducers, i.e. devices providing a mechanical advantage to allow a user to force a rod into or onto an anchor head other than by means of a rod-to-bone anchor locking element; rod removers
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7091—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for applying, tightening or removing longitudinal element-to-bone anchor locking elements, e.g. caps, set screws, nuts or wedges

Abstract

Provided is a novel rod reducing device for use in spinal fixation procedures.
The device is capable with a single action of securely grasping the head of a bone screw while reducing a connecting rod into the head of the bone screw and while in position on the bone screw provide a cannula access for a bone screw locking cap and tightening instrument and securing the bone screw during the tightening of the locking cap so as to provide an anti-torque effect. The device is also capable of releasing from the bone screw with a reversal of the single action used to activate the device. A method of using the device and a kit wherein the device is one component is also provided.

Claims (18)

1. A novel rod reducing device for use in positioning a connecting rod into position in the head of a bone screw, the device comprising:

a housing having a first end and a second end and a lumen defined by said housing and communicating between said first end and said second end;

a slidable sleeve having a first end and a second end, said sleeve being circumferentially disposed around at least a lower portion of said housing and terminating at said second end in a connecting rod driving member;

an actuation lever pivotally connected to said housing and operationally connected to said sleeve by a pivotal connection to a first end of a force transfer arm, which is connected at a second end to said sleeve;

whereby the device is capable of transferring the force from said actuation lever and the force transfer arm to effect the slidable movement of the sleeve downward along the outside of the housing to a position where said connecting rod driving member is capable of contacting and forcing a rod downward into position in the head of a bone screw.
2. The device of Claim 1, wherein said housing terminates in a grasping element, said grasping element configured to be capable of securely grasping the head of a bone screw when said device is activated.
3. The device of Claim 2, wherein said housing further comprises at least one cam surface disposed proximate to said second end of said housing and sized to make forcible contact with said sleeve when said sleeve is slidably moved downward along the outside of said housing, said housing being bifurcated at least at the position adjacent said grasping elements such that said forcible contact between said cam surfaces of said housing and said sleeve is capable of forcing said grasping elements inward so as to be capable of securely grasping the head of a bone screw positioned there between.
4. The device of Claim 3, wherein said grasping elements are configured to complement the size and shape of a groove or notch on said head of the bone screw.
5. The device of Claim 3, wherein said lumen of said device is capable of acting as a cannulae through which other instruments or devices can be freely passed.
6. The device of Claim 5, wherein said device is capable of remaining attached to the head of a bone screw while said other instruments inserted through said lumen are used to apply torque to tighten or loosen an attachment to the head of the bone screw, the device providing an anti-torque handle attachment to facilitate an anti-torque effect on the bone screw.
7. The device of Claim 1, further comprising a biasing element compartment defined as a space between a portion of said sleeve and an adjacent portion of said housing, said compartment being limited at a distal position by a biasing element stop and limited at a proximal position by a retaining member stop, said compartment containing a biasing element capable of compression under force and capable of expansion upon removal of said force and being sized to fit when fully expanded within said compartment, said compartment further containing a biasing element retaining member disposed between said biasing element and said retaining member stop.
8. The device of Claim 7, wherein said biasing element is capable of being compressed within said compartment by the downward sliding movement of said sleeve along the outside of said housing when there is a movement of said actuation lever of the device.
9. The device of Claim 1, wherein said sleeve is perforated.
10. The device of Claim 1, further comprising a hand guard positioned on said housing.
11. A method of positioning and reducing a rod into the head of a bone screw, the method comprising:

providing the device of Claim 1, providing at least one bone screw and at least one connecting rod, implanting said at least one screw into the bone of a subject, positioning said device onto the head of said bone screw such that said second end of said housing is in position to grasp the head of said bone screw, actuating the device whereby said sleeve of said device is slidably moved downward along the outside of said device housing to a position where said connecting rod driving member of said sleeve contacts and forcibly reduces the rod into position in the head of the screw while the screw head is being grasped by the second end of the housing.
12. The method of Claim 11, wherein the second end of the housing is provided with grasping elements which facilitate a secure grasp of the screw head.
13. The method of Claim 12, wherein the actuation of the device is accomplished by the movement of an actuation lever toward the housing and said inward movement is met with resistance from a biasing element within said device.
14. The method of Claim 1, further comprising the step of inserting a bone screw locking cap and tightening instrument down through the lumen of the device and tightening said locking cap into position in the head of the bone screw so as to securely lock the connecting rod into position while said device is still connected to said bone screw.
15. The method of Claim 14, further comprising the step of providing an anti-torque effect for said bone screw during said tightening step.
16. The method of Claim 14, further comprising the step of moving the actuation lever outward and away from the housing thereby releasing said device from the bone screw.
17. A kit for fixing bone, the kit comprising:
the device of Claim 1, at least one bone screw, and at least one connecting rod.
18. The kit according to Claim 16, further comprising:

at least one additional tool configured to facilitate insertion and/or connection of a locking cap for a bone screw.
CA2630494A 2005-09-29 2006-09-06 Single action anti-torque rod reducer Expired - Fee Related CA2630494C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US72148105P 2005-09-29 2005-09-29
US60/721,481 2005-09-29
US11/514,915 2006-09-05
US11/514,915 US7771430B2 (en) 2005-09-29 2006-09-05 Single action anti-torque rod reducer
PCT/US2006/034498 WO2007040888A2 (en) 2005-09-29 2006-09-06 Single action anti-torque rod reducer

Publications (2)

Publication Number Publication Date
CA2630494A1 true CA2630494A1 (en) 2007-04-12
CA2630494C CA2630494C (en) 2012-11-20

Family

ID=37906636

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2630494A Expired - Fee Related CA2630494C (en) 2005-09-29 2006-09-06 Single action anti-torque rod reducer

Country Status (5)

Country Link
US (2) US7771430B2 (en)
EP (1) EP1942814B1 (en)
AU (1) AU2006297547B2 (en)
CA (1) CA2630494C (en)
WO (1) WO2007040888A2 (en)

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Also Published As

Publication number Publication date
US20070093849A1 (en) 2007-04-26
US8834474B2 (en) 2014-09-16
EP1942814A2 (en) 2008-07-16
AU2006297547B2 (en) 2013-05-02
CA2630494C (en) 2012-11-20
US20100324609A1 (en) 2010-12-23
WO2007040888A3 (en) 2007-05-31
WO2007040888A2 (en) 2007-04-12
EP1942814B1 (en) 2018-04-18
AU2006297547A1 (en) 2007-04-12
EP1942814A4 (en) 2009-09-02
US7771430B2 (en) 2010-08-10

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