Patent ID: 7699867
Filing Date: 2010-04-20
Classification: A61F

Abstract:
1. A removable filter for capturing thrombi in a blood vessel, the filter comprising: a plurality of primary struts each having a first length, the primary struts having first ends attached together along a longitudinal axis and housed within a hub, wherein the primary struts emanate from a first end of the hub, each primary strut having an arcuate segment including a first curved portion extending from the first end and a second curved portion extending from the first curved portion and terminating at an anchoring hook, the first and second curved portions defining a soft-S shape, each primary strut extending arcuately along the longitudinal axis and linearly radially, the primary struts being configured to move between an expanded state for engaging the anchoring hooks with the blood vessel and a collapsed state for filter retrieval or delivery, each primary strut being configured to cross another primary strut along the longitudinal axis in the collapsed state such that the arcuate segments occupy a first diameter, the first diameter being the distance between opposite arcuate segments of the primary struts in the collapsed state, the first diameter being greater than a second diameter occupied by the anchoring hooks in the collapsed state for filter retrieval or delivery, the second diameter being the largest diameter occupied by the anchoring hooks in the collapsed state, each primary strut of the plurality of primary struts having a spring biased configuration that is self-expanding; and a plurality of secondary struts separate from the primary struts, the secondary struts having a second length and connected ends attached together along the longitudinal axis and housed within the hub, wherein the secondary struts emanate from the first end of the hub and extend arcuately therefrom to free ends to centralize the filter in the expanded state in the blood vessel, each secondary strut extending arcuately along the longitudinal axis and linearly radially, each secondary strut having a first arc extending from the connected end away from the longitudinal axis and a second arc extending from the first arc towards the longitudinal axis, the second arc extending to the free end without a hook, the secondary struts having a smaller diameter than the primary struts, wherein the length of the filter is defined by the first length of the primary struts.