Removable Vena Cava Filter
AssigneeCook Incorporated
InventorTHOMAS A. OSBORNE
Life of this patent
Estimating the term…
Abstract
A removable filter for capturing thrombi in a blood vessel. The filter comprises a plurality of primary struts having first ends connected to each other to define a central axis of the filter. Each primary strut has a curved member extending from the central axis and terminates at an anchoring hook to engage the blood vessel at a first axial plane. The filter further comprises a plurality of secondary struts connected to the curved members of the primary struts and extending therefrom to a free end at a second axial plane to centralize the filter in the blood vessel.
Claims20
A removable filter for capturing thrombi in a blood vessel, the filter comprising:
- a plurality of primary struts having first ends connected to each other to define a central axis of the filter, each primary strut having a curved member extending from the central axis and terminating at an anchoring hook to engage the blood vessel at a first axial plane, each curved member having a first curved portion configured to bend away from the central axis in a single curve along the length of each curved member and a second curved portion configured to bend toward the central axis along the length of each curved member;
- and
- a plurality of secondary struts connected to and contacting the curved members of the primary struts and extending therefrom to free ends at a second axial plane to centralize the filter in the blood vessel, each free end not contacting the plurality of primary struts, the primary and secondary struts forming a minimal diameter defining a collapsed configuration of the filter and a maximum diameter defining an expanded configuration of the filter, each secondary strut being formed of a single curve and being secured to one of the first curved portions, each secondary strut contacting no primary struts other than the one primary in the expanded configuration.
The removable filter of clam 1 wherein the primary struts are configured to pivot at the first ends thereof to move between the collapsed and expanded configurations.
A removable filter for capturing thrombi in a blood vessel, the filter comprising:
- a plurality of primary struts having first ends axially connected to each other to define a central axis of the filter, each primary strut having a curved member extending from the central axis and terminating at an anchoring hook to engage the blood vessel at a first axial plane, each curved member having a first curved portion configured to bend away from the central axis in a single curve along the length of each curved member and a second curved portion configured to bend toward the central axis along the length of each curved member;
- and
- a plurality of secondary struts, each secondary strut connected to and contacting one of the curved members, each secondary strut extending therefrom to a free end at a second axial plane to centralize the filter in the blood vessel, the free end not contacting the plurality of primary struts, the primary struts and the secondary struts forming a minimal diameter defining a collapsed configuration of the filter and a maximum diameter defining an expanded configuration of the filter, the free ends of the secondary struts being configured to engage the blood vessel in the expanded configuration, each secondary strut being formed of a single curve and being secured to the first curved portion of the curved member such that the secondary strut forms a continuation of the single curve of the first curved portion in the expanded configuration, the secondary strut and the first curved portion having substantially the same radius of curvature in the expanded configuration,
- wherein one secondary strut is connected to one primary strut, each secondary strut contacting no primary struts other than the one primary strut, and each secondary strut contacting no other secondary struts in the expanded configuration.
Dependencies are inferred from the claim text.