Patent ID: 8678821

Claim:
An implant comprising: a collar configured for disposal within tissue, the collar defining a threaded axial bore; a shaft including a threaded outer surface and extending between a first end and a second end, the first end of the shaft being disposed with the axial bore of the collar such that the threads on the outer surface of the shaft engage the threaded axial bore; a base defining an axial bore including a threaded inner surface, the second end of the shaft being disposed within the axial bore of the base such that the threads on the outer surface of the shaft engage the threaded inner surface of the base and the base is axially movable relative to the collar; and at least one arm extending between the collar and the base including a first linking member engaged with the base, the first linking member having a hinged connection to a second linking member engaged with the collar, the first linking member including a locking element projecting from a surface of the first linking member and the second linking member defining an opening configured for disposal of the locking element, the at least one arm being movable via axial movement of the base relative to the shaft between a first position in which the collar and the base are separated by a first distance and the first linking member is spaced apart from the second linking member, and a second position in which the collar and the base are separated by a second, reduced distance and the first linking member engages the second linking member such that the locking element is fixed within the opening to lock the at least one arm in the second position.