Instrument for inserting, adjusting and removing pedicle screws and other orthopedic implants
First Claim
1. A screwdriver for a polyaxial screw having a head portion movably mounted to a shaft portion, the screwdriver comprising:
- a body assembly defining an axially extending inner passageway and including a plurality of retractable tabs for selectively engaging recesses on the polyaxial screw and a tip defining a plurality of alignment protrusions for mating with a rod-receiving opening on the polyaxial screw to align the screwdriver with the polyaxial screw;
an inner shaft for applying distraction between the head portion and the shaft portion to rigidify the screw, the inner shaft being movably disposed within the passageway;
a threaded rotatable collar surrounding the body assembly and having a threaded inner surface; and
a coupling pin extending from the inner shaft and interfering with the threaded inner surface of the collar to couple the inner shaft to the threaded collar.
1 Assignment
0 Petitions
Accused Products
Abstract
An instrument for inserting, adjusting and engaging an implant, such as a polyaxial screw of a spinal fixation system, includes at least one retratractable tab for engaging a corresponding recess on the implant and a shaft that moves relative to the retractable tab. The movable shaft selectively moves the tab between an expanded position for engaging the recess and a retracted position out of engagement with the recess. The shaft selectively engages a portion of the implant to rigidify the implant after the retractable tab engages the recess. The axially extending shaft may be disposed within an axially extending passageway of a body assembly. A rotatable collar surrounding the body assembly is coupled to the shaft for moving the shaft relative to the retractable tab.
62 Citations
4 Claims
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1. A screwdriver for a polyaxial screw having a head portion movably mounted to a shaft portion, the screwdriver comprising:
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a body assembly defining an axially extending inner passageway and including a plurality of retractable tabs for selectively engaging recesses on the polyaxial screw and a tip defining a plurality of alignment protrusions for mating with a rod-receiving opening on the polyaxial screw to align the screwdriver with the polyaxial screw; an inner shaft for applying distraction between the head portion and the shaft portion to rigidify the screw, the inner shaft being movably disposed within the passageway; a threaded rotatable collar surrounding the body assembly and having a threaded inner surface; and a coupling pin extending from the inner shaft and interfering with the threaded inner surface of the collar to couple the inner shaft to the threaded collar. - View Dependent Claims (2, 3, 4)
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Specification