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US 11,596,447 B2Granted
Bone anchor with deployable purchase element
AssigneeNuVasive, Inc.
InventorsJesse Unger, Robert German, Nicholas Didier
Life of this patent
Estimating the term…
Abstract
A bone anchor is provided for connecting a rod to a bone structure, the bone anchor having a rod housing configured to accommodate the rod; a cavity distal to the rod housing dimensioned to accommodate the bone structure; and a deployable purchase element capable of assuming a deployed position in which the purchase element protrudes into the cavity, and capable of assuming a non-deployed position in which the purchase element does not substantially protrude into the cavity.
Claims20
A bone anchor for anchoring a spinal rod to a bone structure, the bone anchor comprising:
- a rod housing configured to accommodate a rod therethrough;
- a hook distal to the rod housing and attached thereto, the hook configured to anchor around the bone structure, wherein the hook comprises a distal portion having two separate prongs, the distal portion configured to curve along a direction perpendicular to a distal to proximal direction;
- a cavity defined by the rod housing and the hook, the cavity configured to accommodate the bone structure when the hook anchors around the bone structure;
- a purchase element housing positioned proximal to the cavity;
- and
- a purchase element movably disposed at least partially within the purchase element housing and configured to deploy into the cavity and attach to the bone structure in response to the rod being reduced into the rod housing, the purchase element including:
- a base slideably received within the purchase element housing, and
- a purchase member extending from the base, the purchase member including a foot portion that extends in a direction perpendicular to a distal to proximal direction.
5 more elements
A bone anchor for anchoring a spinal rod to a bone structure, the bone anchor comprising:
- a rod housing configured to accommodate a rod therethrough;
- a hook distal to the rod housing, the hook configured to anchor around the bone structure;
- a cavity defined by the rod housing and the hook, the cavity configured to accommodate the bone structure when the hook anchors around the bone structure;
- a purchase element housing positioned proximal to the cavity, the purchase element housing including:
- a recess enclosed therein,
- a pair of distally extending slots, and
- an aperture at a distal end of the purchase element housing between the pair of distally extending slots;
- and
- a purchase element, at least a portion of the purchase element configured to be received in the recess extending along a direction perpendicular to a distal to proximal direction in a retracted position, the purchase element including:
- a base slideably received within the purchase element housing between the pair of distally extending slots,
- a purchase member extending from the base and positioned laterally between the pair of distally extending slots of the purchase element housing, and
- a pair of lateral pins that are received within the pair of distally extending slots.
9 more elements
A bone anchor for anchoring a spinal rod to a bone structure, the bone anchor comprising:
- a rod housing enclosing a rod channel, the rod channel configured to accommodate a rod therethrough;
- a hook distal to the rod housing, the hook configured to anchor around the bone structure;
- a cavity defined by the rod housing and the hook, the cavity configured to accommodate the bone structure when the hook anchors around the bone structure;
- a purchase element housing positioned proximal to the cavity, the purchase element housing including a recess enclosed therein;
- and
- a purchase element movably disposed at least partially within the purchase element housing and configured to protrude into the rod channel and retract from the cavity in a retracted position and configured to retract from the rod channel and deploy into the cavity and attach to the bone structure in response to the rod being reduced into the rod housing, the purchase element including:
- a base slideably received within the purchase element housing,
- a pair of lateral pins that are received within distally extending slots of the purchase element housing, and
- a purchase member extending from the base, the purchase member including a foot portion configured to be received in the recess of the purchase element housing extending along a direction perpendicular to a distal to proximal direction.
6 more elements
Dependencies are inferred from the claim text.