| 主权项 |
1. A device for extracting an elongated implanted structure from an obstruction within a vessel of a patient, comprising:
an inner sheath assembly comprising an inner sheath and an inner tip, the inner sheath having a distal end and having a passageway extending therethrough, the sheath being sufficiently flexible to track over the implanted structure within the vessel; the inner tip having a proximal portion, a distal portion having an outer surface, and a passageway extending therethrough, the proximal portion of the inner tip engaged with the inner sheath distal end such that the respective passageways are aligned to receive the implanted structure therein, the distal portion of the inner tip having an outer surface including a plurality of helical disrupter elements circumferentially disposed therealong, the plurality of helical disrupter elements being configured to facilitate disruption of the implanted structure from the obstruction; and an outer sheath assembly comprising an outer sheath and an outer tip, the outer sheath having a distal end, an outer diameter, and a passageway extending therethrough, the outer sheath being sufficiently flexible to track over the inner sheath assembly; the outer tip having a proximal portion, a distal portion, and a passageway extending therethrough, the outer tip proximal portion engaged with the outer sheath distal end such that the respective passageways are aligned to receive the inner sheath assembly therein, the outer tip distal portion being configured to engage and stabilize tissue of the vessel during an advancement of the inner sheath assembly through the vessel, the outer tip having an outer surface including a plurality of helical raised elements circumferentially disposed therealong, said helical raised elements configured for stabilizing tissue of said vessel during advancement of the device through the vessel, wherein the outer sheath assembly is axially and rotationally movable relative to the inner sheath assembly. |
