Devices and methods for dynamic fixation of skeletal structure
First Claim
Patent Images
1. A bone fixation assembly, comprising:
- an elongate connecting member;
a fixation member configured to attach to a bony segment;
an inner housing comprising;
a first receptacle into which at least a portion of the connecting member is positioned; and
a first locking mechanism configured to immobilize the at least portion of the connecting member to the inner housing;
an outer housing comprising;
a second receptacle into which at least a portion of the inner housing is positioned;
a third receptacle into which at least a portion of the fixation member is positioned; and
a second locking mechanism configured to immobilize the fixation member to the outer housing when in a locked configuration, the inner housing being movable relative to the outer housing despite the locked configuration of the first and second locking mechanisms.
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Abstract
The disclosed screw assemblies include a screw that attaches onto the bone, a housing member that connects and inter-locks the bone screw to the rod, and one or more locking members that permit immobilization of various components of the assembly relative to one another while still permitting some relative movement. The bone screws and bone screw assemblies described herein permit flexible stabilization of the spine.
220 Citations
30 Claims
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1. A bone fixation assembly, comprising:
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an elongate connecting member; a fixation member configured to attach to a bony segment; an inner housing comprising; a first receptacle into which at least a portion of the connecting member is positioned; and a first locking mechanism configured to immobilize the at least portion of the connecting member to the inner housing; an outer housing comprising; a second receptacle into which at least a portion of the inner housing is positioned; a third receptacle into which at least a portion of the fixation member is positioned; and a second locking mechanism configured to immobilize the fixation member to the outer housing when in a locked configuration, the inner housing being movable relative to the outer housing despite the locked configuration of the first and second locking mechanisms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14)
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12. A bone fixation assembly, comprising:
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an elongated connecting member; a receiving member comprising a first locking feature and a cavity configured to seat the elongated connecting member; a bone engaging member comprising a proximal head and a distal shank; a housing member comprising a first cavity configured to seat the head of the bone engaging member and second cavity configured to seat the receiving member; and a second locking feature configured to substantially immobilize the bone engaging member to the housing member when in a locked configuration, and to permit movement between the receiving member and the housing member when in any configuration; wherein the first locking feature is further configured to immobilize the elongated connecting member to the receiving member when in a locked configuration, and to permit movement between the receiving member and a housing member when in any configuration. - View Dependent Claims (13, 15, 16, 17, 18, 19)
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20. A bone fixation assembly, comprising:
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an elongate connecting member; a fixation member configured to be secured to a spinal segment; and a housing member comprising a locking feature, a first segment configured to seat an inner housing and a second segment configured to seat a segment of the fixation member, the first segment being substantially aligned coaxially with the locking feature and the second segment; the inner housing comprising a socket configured to seat at least a portion of the connecting member; and a locking mechanism configured to immobilize at least a portion of the fixation member to the housing member when in a locked configuration; wherein the inner housing is movable relative to the housing member when the locking mechanism is in any configuration. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification