Polyaxial orthopedic fastening apparatus with independent locking modes
First Claim
1. An apparatus comprising:
- an implant;
a fixation member comprising a first interface and a distal end implantable in a bone; and
a rotational fastener comprising a second interface, wherein the second interface is rectilinearly translatable along the first interface, wherein the first and second interfaces have complementary antirotation features,wherein the apparatus comprises a locked configuration in which the rotational fastener engages the implant in any of a plurality of relative orientations between the implant and the rotational fastener about a first axis to substantially prevent any relative rotation between the implant and the rotational fastener about the first axis;
wherein, in the locked configuration, the rotational fastener is slidably attachable to the fixation member to permit motion of the rotational fastener along the fixation member in a direction nonparallel to the first axis,wherein the rotational fastener comprises an interpositional member and an engagement member configured to be actuated with respect to the interpositional member to move the rotational fastener from an unlocked configuration to the locked configuration, wherein the engagement member is shaped to expand to move the rotational fastener from the unlocked configuration to the locked configuration, and wherein the rotational fastener further comprises a rotational locking member configured to be advanced along the interpositional member to urge the engagement member to expand, and to keep the rotational fastener in the locked configuration.
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Accused Products
Abstract
An apparatus is designed to attach an implant to bone in a manner that permits rotational adjustment of the implant about multiple axes prior to securement via the apparatus. The apparatus includes separate rotational and translational fasteners that can be individually locked to independently restrict rotation and translation of the implant relative to the bone. The rotational fastener includes an interpositional member, an expandable engagement member, and a rotational locking member that urges the expandable engagement member to advance along the interpositional member. The resulting expansion of the engagement member causes it to engage the implant. The rotational fastener is slidable along a fixation member implanted in the bone until the translational fastener is applied to restrict relative translation between the rotational fastener and the bone.
426 Citations
12 Claims
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1. An apparatus comprising:
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an implant; a fixation member comprising a first interface and a distal end implantable in a bone; and a rotational fastener comprising a second interface, wherein the second interface is rectilinearly translatable along the first interface, wherein the first and second interfaces have complementary antirotation features, wherein the apparatus comprises a locked configuration in which the rotational fastener engages the implant in any of a plurality of relative orientations between the implant and the rotational fastener about a first axis to substantially prevent any relative rotation between the implant and the rotational fastener about the first axis; wherein, in the locked configuration, the rotational fastener is slidably attachable to the fixation member to permit motion of the rotational fastener along the fixation member in a direction nonparallel to the first axis, wherein the rotational fastener comprises an interpositional member and an engagement member configured to be actuated with respect to the interpositional member to move the rotational fastener from an unlocked configuration to the locked configuration, wherein the engagement member is shaped to expand to move the rotational fastener from the unlocked configuration to the locked configuration, and wherein the rotational fastener further comprises a rotational locking member configured to be advanced along the interpositional member to urge the engagement member to expand, and to keep the rotational fastener in the locked configuration. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus comprising:
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an implant; a fixation member having a first interface and a distal end implantable in a bone; and a rotational fastener comprising; an interpositional member comprising a second interface, wherein the second interface is complementary to the first interface with clearance, wherein the first and second interfaces are keyed together to permit translation of the interpositional member along the fixation element and restrict rotation of the interpositional member around the fixation element, an engagement member configured to be coupled to the interpositional member, the engagement member comprising an implant engagement surface, wherein the engagement member is configured to be actuated with respect to the interpositional member to move the rotational fastener from an unlocked to a locked configuration, and wherein the engagement member is shaped to expand the rotational fastener from the unlocked configuration to the locked configuration; and a rotational locking member configured to be advanced along the interpositional member to urge the engagement member to expand, and to keep the rotational fastener in the locked configuration, wherein the engagement member is expandable to move the implant engagement surface into engagement with the implant to restrict rotation of the implant with respect to the rotational fastener. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification