Implant with structure for securing a porous portion
First Claim
Patent Images
1. An implant extending along an axis, comprising:
- a head portion including a first externally threaded surface configured for engaging bone;
a non-bone, porous intermediate portion, including;
a bore axially extending throughout the intermediate portion, anda porous wall extending from a porous exterior surface of the intermediate portion to a porous interior surface of the intermediate portion, the porous interior surface defining a perimeter of the bore, wherein the perimeter defines a diameter of the bore that is substantially constant in an axial direction;
an initially separate stem portion configured to engage the head portion so that at least the head portion and the stem portion cooperatively secure the intermediate portion on the implant without the intermediate portion being bonded to the head and stem portions, the stem portion including a second externally threaded surface configured for engaging bone;
a core having a core diameter approximately equal to the diameter of the bore, the core extending axially from at least one of the head portion, the stem portion, and both the head and the stem portions.
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Accused Products
Abstract
An implant includes a head portion, an intermediate portion and an initially separate stem portion configured to engage the head portion so that at least the head portion and the stem portion cooperatively secure the intermediate portion on the implant. The implant may also include a locking mechanism configured to secure the head portion to the stem portion by a press fit or a threaded connection. The intermediate portion may include a porous metal such as tantalum.
350 Citations
27 Claims
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1. An implant extending along an axis, comprising:
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a head portion including a first externally threaded surface configured for engaging bone;
a non-bone, porous intermediate portion, including;a bore axially extending throughout the intermediate portion, and a porous wall extending from a porous exterior surface of the intermediate portion to a porous interior surface of the intermediate portion, the porous interior surface defining a perimeter of the bore, wherein the perimeter defines a diameter of the bore that is substantially constant in an axial direction; an initially separate stem portion configured to engage the head portion so that at least the head portion and the stem portion cooperatively secure the intermediate portion on the implant without the intermediate portion being bonded to the head and stem portions, the stem portion including a second externally threaded surface configured for engaging bone; a core having a core diameter approximately equal to the diameter of the bore, the core extending axially from at least one of the head portion, the stem portion, and both the head and the stem portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of assembling a dental implant, comprising:
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placing, in an apical to coronal direction, a porous, non-bone sleeve on a core extending from at least one of a head portion and a separate stem portion wherein the head portion and the stem portion each include externally threaded surfaces for engaging, and threading the implant into bone, wherein the porous, non-bone sleeve includes a porous wall extending from an exterior surface to an interior surface, the interior surface defining a perimeter of a bore configured to be placed on the at least one of the head portion and the separate stem portion, the head portion and the stem portion each including a retaining shoulder extending radially outward from a longitudinal axis of the assembled dental implant, the perimeter of the bore defining a bore diameter approximately equal to a diameter of the core, wherein the bore diameter is substantially the same at a first location where the porous, non-bone sleeve engages the retaining shoulder of the head portion and at a second location where the porous, non-bone sleeve engages the retaining shoulder of the stem portion; and engaging the stem portion to the head portion so that the head portion and the stem portion cooperatively secure the porous sleeve portion on the implant between the retaining shoulder of the head portion and the retaining shoulder of the stem portion without bonding the sleeve to the head and stem portions.
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27. An implant extending along an axis, comprising:
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a head portion including a first externally threaded surface configured for engaging bone;
a non-bone, porous intermediate portion, including;a bore axially extending throughout the intermediate portion, the bore including a diameter that is substantially constant between a coronal end of the bore and an apical end of the bore, and a porous exterior surface including a continuous taper from a coronal end of the intermediate portion to an apical end of the intermediate portion; an initially separate stem portion configured to engage the head portion so that at least the head portion and the stem portion cooperatively secure the intermediate portion on the implant without the intermediate portion being bonded to the head and stem portions, the head portion configured to engage the coronal end of the intermediate portion, the stem portion including a second externally threaded surface configured for engaging bone; a core extending axially from at least one of the head portion, the stem portion, and both the head and the stem portions, the core defining a core diameter approximately equal to the bore diameter such that the core is configured to have a friction-fit with the non-bone, porous intermediate portion when engaged therewith.
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Specification