Patent ID: 8597314
Filing Date: 2013-12-03
Classification: A61B

Abstract:
1. A vascular constriction crossing mechanism comprising: an inner sheath having a proximal segment and a distal segment, and defining a longitudinal axis and an axially extending wire guide lumen, and the wire quide lumen extending through the inner sheath from a first open lumen end within the proximal segment to a second open lumen end within the distal segment, such that the wire guide lumen is unobstructed to passage of a wire guide through the inner sheath; an outer sheath having a proximal segment and a distal segment, and defining a longitudinal axis; a constriction crossing tip coupled with the distal segment of the inner sheath and having an opening to the wire guide lumen formed therein; a helical coupling between the inner sheath and the outer Sheath; the inner sheath being positioned within the outer sheath and rotatable relative to the outer sheath, such that the helical coupling converts a torque on the proximal segment of the inner sheath to an axial force on the inner sheath driving the inner sheath and the constriction crossing tip in a proximal to distal direction relative to the outer sheath, for crossing a vascular constriction with the constriction crossing tip; and an anchoring mechanism attached to the outer sheath and having a rest state, and a deployed state including a vascular wall contact state whereby the anchoring mechanism resists displacement of the outer sheath within a vascular structure of a patient in response to the driving of the inner sheath.