Polyaxial bone screw
First Claim
Patent Images
1. A polyaxial fixation device, comprising:
- a shank having a spherical head formed on a proximal end thereof;
a receiver member having an axial passage formed therein and adapted to polyaxially seat the spherical head of the shank; and
an engagement member adapted to provide sufficient friction between the spherical head and the receiver member to enable the shank to be maintained in a desired angular orientation before locking the spherical head within the receiver member.
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Abstract
The present invention generally provides a polyaxial fixation device having a shank with a spherical head formed on a proximal end thereof, and a receiver member having an axial passage formed therein that is adapted to polyaxially seat the spherical head of the shank. The polyaxial bone screw further includes an engagement member that is adapted to provide sufficient friction between the spherical head and the receiver member to enable the shank to be maintained in a desired angular orientation before locking the spherical head within the receiver member.
433 Citations
31 Claims
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1. A polyaxial fixation device, comprising:
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a shank having a spherical head formed on a proximal end thereof;
a receiver member having an axial passage formed therein and adapted to polyaxially seat the spherical head of the shank; and
an engagement member adapted to provide sufficient friction between the spherical head and the receiver member to enable the shank to be maintained in a desired angular orientation before locking the spherical head within the receiver member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A polyaxial fixation assembly, comprising:
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a shank having a spherical head formed on a proximal end thereof;
a receiver member having a first, proximal opening adapted to receive a spinal fixation rod and a second, distal opening having a diameter sized to permit passage of the shank therethrough while maintaining the spherical head therein, the receiver member further including a spherical seat adjacent the second, distal opening to polyaxially seat the spherical head of the shank; and
means for frictionally engaging the spherical head to maintain the shank in a desired angular orientation such that a force greater than a frictional engagement force is required to change the angular orientation of the shank with respect to the receiver member. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification