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US 2008/0177321 A1Published application
Multi-axial bone attachment member
AssigneeWarsaw Orthopedic, Inc.
InventorsTroy D. Drewry, William B. Null, Marc T. Paul
Life of this patent
Estimating the term…
Abstract
Orthopedic constructs having parts that are movable with respect to each other and one or more friction members to limit unintended movement are disclosed. In one embodiment, a multi-axial bone anchor having a receiver member and a screw-type anchor is provided. The receiver member includes one or more internal apertures in which a friction member is placed, and a portion of the anchor contacts or is loosely held by the friction member(s).
Claims20
An orthopedic implant apparatus comprising:
- a receiver member for receiving at least a part of a spinal rod, said receiver member having a lower opening and an internal chamber with a side wall, said receiver member further having at least one aperture in said side wall, and further including at least one friction member at least partially in at least one of said apertures;
- and
- an anchor member having a head portion and an anchor portion, said anchor member being movably connected to said receiver member, said head portion abutting said friction member so that unintended relative movement of said anchor member and said receiver member is substantially limited.
An orthopedic implant apparatus comprising:
- a receiver member having at least one aperture and at least one friction member at least partially inserted fixedly in said at least one aperture;
- a crown member slidably positioned in said receiver member;
- and
- an anchor member movably connected to said receiver member, said anchor member having a head portion adjacent said crown member, and wherein at least a portion of said anchor member abuts said friction member.
1 more element
An orthopedic implant apparatus comprising:
- a first portion having an internal surface, a friction member being fixedly placed on or in said internal surface;
- and
- a second portion connected to and movable with respect to said first portion, a part of said first portion abutting said friction member so that unintended relative movement of said anchor member and said receiver member is substantially limited.
Dependencies are inferred from the claim text.