SPINAL FIXATION SYSTEM AND SCREWDRIVER TOOL FOR USE WITH THE SAME
First Claim
1. A screwdriver for securing a pedicle screw of a screw/tulip spinal fixation assembly into a vertebra comprising:
- a tubular guide member having a distal threaded portion for threadable coupling with a tulip associated with the screw/tulip assembly;
a drive shaft coaxially received within guide member for independent longitudinal and rotational movements therewith; and
a screw engagement unit attached to a distal end of the drive shaft for operative engagement with the pedicle screw.
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Accused Products
Abstract
A spinal fixation system that utilizes a composite rod to which polyaxial pedicle screw/tulip assemblies are secured, a screwdriver that permits independent threading of a guide member to the tulip and independent threading of the pedicle screw, together with interengaging conical surfaces that true the screwdriver with the pedicle screw. In preferred embodiments, the screwdriver includes an elongated drive shaft having a handle end for imparting rotation and a pedicle screw engaging end, a cylindrical guide member rotatably mounted about said drive shaft, a knob at one end of said guide member for rotating same and a threaded tulip engaging end at the other end thereof. A grip is preferably sleeved around the cylindrical drive member and is longitudinally movable between proximal and distal positions wherein its distal end uncovers and covers, respectively, the screw engaging unit.
110 Citations
25 Claims
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1. A screwdriver for securing a pedicle screw of a screw/tulip spinal fixation assembly into a vertebra comprising:
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a tubular guide member having a distal threaded portion for threadable coupling with a tulip associated with the screw/tulip assembly; a drive shaft coaxially received within guide member for independent longitudinal and rotational movements therewith; and a screw engagement unit attached to a distal end of the drive shaft for operative engagement with the pedicle screw. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A unit assembly comprising a pedicle screw/tulip assembly having a pedicle screw received within an interiorly threaded tulip, and a screwdriver for implanting the pedicle screw into a vertebrae, wherein the screw driver comprises:
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an elongated tubular guide member having proximal and distal ends, and including a knob at the proximal end thereof to allow for rotational motion to be imparted thereto, and a threaded tulip engaging portion at the distal end thereof for threaded engagement with the interior threads of the tulip member; an elongated drive shaft received within the guide member for independent longitudinal and rotational movements therewith, wherein the drive shaft includes a proximal handle end to allow rotation to be imparted to the drive shaft, and a distal pedicle screw engaging end opposite to the handle end; and a grip sleeved around the guide member and drive shaft and being longitudinally movable between a distal position wherein a distal end of the grip covers at least a portion of the screw engaging end of the drive shaft, and a proximal position wherein the portion of the screw engaging end is uncovered. - View Dependent Claims (16, 17, 18, 19)
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20. A spinal fixation system for stabilizing a spinal segment comprising:
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a plurality of polyaxial screw/tulip assemblies which include a polyaxial screw receivable within a threaded tulip having an interiorly threaded portion, a connecting rod for interconnecting the plurality of screw/tulip assemblies, and a screwdriver for implanting the polyaxial screws of the screw/tulip assemblies in a respective vertebrae of the spinal segment in need of stabilization, wherein the screwdriver comprises; (i) a tubular guide member having a distal threaded portion at a distal end thereof for threadable coupling with the interiorly threaded portion of the tulip of the screw/tulip assembly; (ii) a drive shaft coaxially received within guide member for independent longitudinal and rotational movements therewith; (iii) a screw engagement unit attached to a distal end of the drive shaft for operative engagement with the pedicle screw; and (iv) an outer generally cylindrical grip sleeved around the guide member. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification