Spinal fixation system
First Claim
1. A polyaxial pedicle screw, comprising:
- a housing having leading and trailing ends, and defining a longitudinal axis that extends through the leading and trailing ends;
a bone screw member including a head and a threaded shaft extending from the head, the head being selectively securable within the housing; and
an anvil positionable within the housing adjacent to the head of the bone screw member when the anvil and the head of the bone screw member are positioned within the housing, the anvil defining at least one groove in an outer surface of the anvil, the at least one groove extending transverse to the longitudinal axis and defining at least one flap that extends over the at least one groove, the at least one flap being flexibly attached to the anvil to enable the anvil to flex an amount sufficient to maintain the head of the bone screw member in constant contact with the anvil when the bone screw member is moved relative to the anvil.
4 Assignments
0 Petitions
Accused Products
Abstract
A polyaxial pedicle screw includes a housing, a bone screw member, and an anvil. The bone screw member includes a head and a threaded shaft extending from the head. The head is selectively securable within the housing. The anvil is positionable within the housing adjacent to the head of the bone screw member when the anvil and the head of the bone screw member are positioned within the housing. The anvil may define one or more grooves in an outer surface of the anvil. The groove defines a flap that is flexibly attached to the anvil to enable the anvil to flex an amount sufficient to maintain the head of the bone screw in constant contact with the anvil when the bone screw member is moved relative to the anvil.
88 Citations
28 Claims
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1. A polyaxial pedicle screw, comprising:
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a housing having leading and trailing ends, and defining a longitudinal axis that extends through the leading and trailing ends; a bone screw member including a head and a threaded shaft extending from the head, the head being selectively securable within the housing; and an anvil positionable within the housing adjacent to the head of the bone screw member when the anvil and the head of the bone screw member are positioned within the housing, the anvil defining at least one groove in an outer surface of the anvil, the at least one groove extending transverse to the longitudinal axis and defining at least one flap that extends over the at least one groove, the at least one flap being flexibly attached to the anvil to enable the anvil to flex an amount sufficient to maintain the head of the bone screw member in constant contact with the anvil when the bone screw member is moved relative to the anvil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A polyaxial pedicle screw comprising:
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a bone screw member including a head, a neck, and a threaded shaft, the neck disposed between the head and the threaded shaft, the head including a first portion and a second portion; and a housing positionable on the head of the bone screw and having a proximal end and a distal end, the distal end defining a distal opening and a cut out configured and dimensioned to receive the neck of the bone screw member to enable the head of the bone screw to be inserted into the housing through the distal opening, wherein the first portion of the head is configured and dimensioned to enable the head to pass through the distal opening of the housing and the second portion of the head is configured and dimensioned to prevent the head of the bone screw from passing through the distal opening of the housing, wherein the bone screw member is positionable between a first position perpendicular to the housing and a second position in coaxial alignment with the housing, the neck receivable in the cut out with the bone screw member in the first position while the head is positioned at least partially in the housing such that transitioning the bone screw member to the second position, with the head remaining at least partially positioned in the housing, enables the head to be fully inserted within the housing. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification