Bone screw systems and methods of use
First Claim
Patent Images
1. A bone fastener assembly, comprising:
- an elongated interconnecting member;
a bone fixation member comprising a first segment configured to be attached onto a skeletal bone and a second segment at least partially seated within an inner housing member;
the inner housing member comprising a first seat configured to receive a segment of the elongated interconnecting member and a second seat configured to receive the second segment of the bone fixation member, the inner housing member being comprised of at least two movable members each forming at least a segment of the first seat and the second seat; and
an outer housing member comprising a seat configured to receive at least a portion of the inner housing and a locking feature that is configured to transition the assembly from a first state to a second state;
wherein in the first state, the bone fixation member is mobile relative to the elongated interconnecting member, and in the second state, the bone fixation member is immobilized relative to the elongated interconnecting member;
wherein the locking feature is separated from direct abutment with the inner housing member; and
wherein transition of the locking feature from the first to the second state produces an increase in a diameter of the first seat of the inner housing member and a reduction in a diameter of the second seat with immobilization of the bone fixation member therein.
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Abstract
The distal bone screw segment of a bone screw system is driven into bone. In a first state, the assembly permits relative motion between its component parts in order to facilitate the placement and correct alignment of an interconnecting rod that is used to couple multiple bone screw systems and/or other orthopedic devices. In a second state, the assembly provides relative immobilization between the assembly components and the inter-connecting rod.
191 Citations
36 Claims
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1. A bone fastener assembly, comprising:
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an elongated interconnecting member; a bone fixation member comprising a first segment configured to be attached onto a skeletal bone and a second segment at least partially seated within an inner housing member; the inner housing member comprising a first seat configured to receive a segment of the elongated interconnecting member and a second seat configured to receive the second segment of the bone fixation member, the inner housing member being comprised of at least two movable members each forming at least a segment of the first seat and the second seat; and an outer housing member comprising a seat configured to receive at least a portion of the inner housing and a locking feature that is configured to transition the assembly from a first state to a second state; wherein in the first state, the bone fixation member is mobile relative to the elongated interconnecting member, and in the second state, the bone fixation member is immobilized relative to the elongated interconnecting member; wherein the locking feature is separated from direct abutment with the inner housing member; and wherein transition of the locking feature from the first to the second state produces an increase in a diameter of the first seat of the inner housing member and a reduction in a diameter of the second seat with immobilization of the bone fixation member therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A bone fastener assembly, comprising:
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an elongated interconnecting member; a bone fixation member comprising a first segment configured to be attached onto a skeletal bone and a second segment at least partially seated within an inner housing member; the inner housing member comprising a first seat configured to receive a segment of the elongated interconnecting member and a second seat configured to receive the second segment of the bone fixation member, the inner housing being comprised of at least two movable members each forming at least a segment of the first seat and the second seat; and an outer housing member comprising a seat configured to receive at least a portion of the inner housing, and a locking feature configured to transition the assembly from a first state to a second state; wherein, in the first state, the bone fixation member is mobile relative to the outer housing member, and in the second state, the bone fixation member is immobilized relative to the outer housing member; and wherein the locking feature is configured to abut and advance the interconnecting member into the first seat of the inner housing member, thereby increasing a diameter of the first seat while concurrently reducing a diameter of the second seat of the inner housing, and wherein removal of the elongated interconnecting member prevents immobilization of the bone fixation member relative to the outer housing member. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A bone fastener assembly comprising:
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a bone fixation member; an elongated interconnecting member; and a first housing member comprising at least a first seat, a second seat, and a locking assembly, the first seat comprises at least a first segment of the interconnecting member, the second seat comprises at least a first segment of the bone fixation member, the locking assembly comprising; a fastener; a second housing comprising an external surface, a first internal bore configured to accept the fastener, and at least one aperture configured to extend from the first internal bore to the external surface; and a movable member at least partially contained within the aperture, the movable member configured to extend from a retracted position to an extended position, in the extended position, at least a segment of the movable member extends beyond the external surface of the second housing member; wherein the movable member is biased towards the extended position; wherein the fastener is further configured to extend from a proximal end to a distal end and a distal segment of the fastener being configured to advance through the internal bore, the distal end of the locking assembly being configured to be positioned above the at least one aperture thereby enabling the locking assembly to be advanced into an internal bore of the first housing member; wherein, when the distal end of the fastener is below the at least one aperture, the locking assembly is prevented from advancement into the housing member. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. A bone fastener assembly comprising:
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a bone fixation member; an elongated interconnecting member; a first housing member comprising a first seat configured to receive at least a segment of the elongated interconnecting member, a second seat configured to receive at least a segment of the bone fixation member, and a locking mechanism assembly sized to be advanced onto the interconnecting member through an internal bore of the first housing member; wherein the locking mechanism assembly comprises; a second housing member comprising an upper surface, an opposing lower surface and a side surface configured to connect the upper and lower surfaces, a second internal bore of the locking mechanism being configured to connect the upper and lower surfaces, and at least one aperture being formed from an opening on a wall of the second internal bore to an opening on the side surface; a movable member comprising at least a segment configured to advance through the at least one aperture and to extend from a retracted position to an extended position, wherein in the extended position, said segment of the movable member extends beyond an external perimeter of the second housing member and prevents advancement of the locking mechanism into the first housing; and a locking member configured to extend from a proximal end to a distal end and comprising a distal segment configured to advance through the second internal bore, the distal end of the locking member is configured to be positioned above the at least one aperture of the second internal bore, thereby enabling the locking mechanism assembly to be advanced into the internal bore of the first housing member; wherein, when the distal end of the locking mechanism is below the aperture, the locking member assembly is prevented from advancement into the first housing member.
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Specification