Patent ID: 8308783
Filing Date: 2012-11-13
Classification: A61B

Abstract:
1. A collapsible bone screw apparatus, comprising; an inner screw member having a first plurality of external threads configured to be directly attached to a first portion of bone tissue and located adjacent to a medial end, a non-threaded portion adjacent to a lateral end, an inner screw opening configured to enable the inner screw member to be screwed independently, and a hollow chamber having a non-threaded inner surface; and an outer screw member axially movable with respect to the inner screw member when deployed in order to provide an adjustable total length of the apparatus, the outer screw member having a second plurality of external threads configured to be directly attached to a second portion of bone tissue when the outer screw member is deployed, the outer screw member being rotationally free with respect to the inner screw member when the outer screw member is assembled to the inner screw member, wherein the outer screw member is configured to be screwed independently from the inner screw member in order to be secured to the second portion of bone tissue and to be assembled to the inner screw member without a connector.