Multi-axial bone anchor system
First Claim
1. A combination for use in medical applications, comprising:
- a washer having an upper surface, a lower surface, and an aperture;
a fastener having a lower surface to contact said upper surface of said washer, and a sleeve portion that extends into said aperture; and
a medical implant connected to at least one of said fastener and said washer.
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Accused Products
Abstract
A multi-axial bone fixation implant includes an elongated member, one or more bone anchor assemblies, and stabilizer members which are fitted within the elongated member. A bone bolt having cancellous threads on one end and machine threads at the opposing end and an enlarged portion between these sections is also provided. The bone bolt is anchored into a bone via the cancellous thread end. The machine threaded end passes through an opening of the elongated member and the stabilizer, and is engaged by a coupled washer and nut. The washer includes an undercut within its oblong aperture, and the nut includes a projecting sleeve. The sleeve is inserted into the washer aperture and expanded, so that the undercut retains the sleeve within the washer without impairing the rotatability or translatability of the nut and washer with respect to each other. When locked by the nut and washer atop the elongated member, the enlarged portion of the bolt is forced against an inside wall of the stabilizer, which is in turn locked against the elongated member. Accordingly, the elongated member is fixed with respect to the bone anchor at one of an infinite number of multi-axial angles.
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Citations
39 Claims
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1. A combination for use in medical applications, comprising:
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a washer having an upper surface, a lower surface, and an aperture;
a fastener having a lower surface to contact said upper surface of said washer, and a sleeve portion that extends into said aperture; and
a medical implant connected to at least one of said fastener and said washer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
providing the combination of claim 1; and
coupling said combination to a medical implant.
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17. The apparatus of claim 1 wherein said fastener has an internal thread.
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18. The combination of claim 1, further comprising an elongated member, wherein said lower surface of said washer contacts said elongated member.
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19. An orthopedic implant, comprising:
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a base member having a lower surface, an upper surface, and at least one aperture;
a stabilizer having an opening, said stabilizer being adjacent said base member in one of an infinite number of positions wherein said opening communicates with at least one of said apertures of said base member;
a fixation member having a first portion for attachment to a bone, a second portion including threads, and an intermediate diametrally enlarged portion, said fixation member extending through said stabilizer and said base member so that said enlarged portion contacts said stabilizer;
a washer having a rounded top, said washer being around said second portion of said fixation member; and
a nut including a sleeve portion extending through said washer, said nut being threaded onto said second threaded part of said fixation member, whereby said fixation member, said stabilizer and said base member can be locked relative to each other. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A method, comprising:
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inserting at least one bone fixation member into a bone;
providing a base member having at least one slot therein and a stabilizer having an aperture;
placing said base member and said stabilizer over said bone fixation member so that said fixation member extends through said stabilizer and said base member;
orienting said base member with respect to said fixation member to a desired relative position;
placing a locking combination over said fixation member, said locking combination including a washer and nut that are movably coupled with respect to each other prior to said placing step; and
threading said nut onto said fixation member, and tightening said nut whereby said base member and said fixation member are locked with respect to each other. - View Dependent Claims (29, 30, 31)
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32. A combination for use in medical applications, comprising:
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a first element having a lower surface for contacting a surface of a medical implant;
a second element rotatably coupled with said first element; and
a bone engaging device for use with said medical implant, wherein said first element and said second element adjoin said bone engaging device so that rotation of said second element engages said second element with said bone engaging device so as to press said surface of said first element against said surface of said medical implant and wherein said first and second elements are rotatably coupled prior to engagement of said second element with said bone engaging device. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
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Specification