Patent ID: 8303666
Filing Date: 2012-11-06
Classification: A61F

Abstract:
1. A modular proximal interphalangeal joint implant assembly comprising: an articulation assembly including a semi-constrained articulation assembly having a first articulation component and a second articulation component, the first articulation component defining a first locking recess that is open on one end and closed at a first terminal wall on an opposite end wherein the first articulating component includes a pair of spaced apart lobes and a recessed surface between the lobes; and wherein the second articulating component includes a raised center portion shaped to articulate with the recessed surface between a pair of side surfaces that each generally slope away from the center portion and are shaped to articulate with the lobes; a first stem component operable to be implanted in a proximal phalanx bone, the first stem component comprising a first flange, a first conical base portion extending from a first side of the first flange, and a first locking device extending from a second side of the first flange that is opposite to the first side, the first locking device comprising a first rail having a first base portion and a first connecting flange, the first rail having a first end face extending from the first flange; a second stem component operable to be implanted in a middle phalanx bone, the second stem component comprising a second flange, a second conical base portion extending from a first side of the second flange, and a second locking device extending from a second side of the second flange that is opposite to the first side, the second locking device comprising a second rail having a second base portion and a second connecting flange, the second rail having a second end face extending from the second flange; a first fastener that extends through a bore defined in the first articulation component and threadably mates with a threaded bore defined in the first rail of the first locking device; wherein the first rail is configured to be slidably received into the first locking recess to a position where the first end face of the first rail engages the first terminal wall of the first locking recess.