Joint prosthesis having a bending hinge that comprises a spreading axle
AssigneeWaldemar Link GmbH & Co. KG
InventorsCarolin Bartels, Klaus Dmuschewsky, Marco Iredi
Life of this patent
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Abstract
A joint prosthesis has a bending hinge, which is formed by a hinge fork and an axle pin, which comprises two axle stubs, which are arranged in an installation position for insertion, in which installation position the axle stubs are retracted in a coupling piece, and in an expanded position after implantation by movement in the axial direction into aligned hinge holes of the hinge fork, wherein the axle pin has two bearing areas at the ends of the axle pin and a joining area lying therebetween, and the axle pin is separated in the joining area along a plane extending in the axial direction, which plane intersects with the jacket of the axle pin at two points.
Claims18
A joint prosthesis comprising a bending hinge formed by a hinge fork and an axial pin, the axial pin comprising two pin stubs arranged in an installation position, in which the pin stubs are retracted in a coupling piece for insertion purposes, and in an expanded position after implantation by being moved in an axial direction into aligned hinge holes in the hinge fork, wherein the axial pin has two bearing regions at its ends and a joining region situated between the bearing regions, and the axial pin is separated in the joining region such that a planar interface between the pin stubs is coplanar with a plane running along the axial direction and intersecting a circumferential surface of the axial pin at two locations.
A joint prosthesis system comprising a joint prosthesis and a spreading instrument, wherein the joint prosthesis comprises a bending hinge formed by a hinge fork and an axial pin, the axial pin comprising two pin stubs arranged in an installation position, in which the pin stubs are retracted in a coupling piece for insertion purposes, and in an expanded position after implantation by being moved in an axial direction into aligned hinge holes in the hinge fork, wherein the axial pin has two bearing regions at its ends and a joining region situated between the bearing regions, and the axial pin is separated in the joining region such that a planar interface between the pin stubs is coplanar with a plane running along the axial direction and intersecting a circumferential surface of the axial pin at two locations, wherein an access slot is formed on the coupling piece for each pin stub, and wherein the spreading instrument is configured to engage in the pin stubs through the access slots.
Dependencies are inferred from the claim text.