Surgery – Instruments – Internal pressure applicator
Reexamination Certificate
2008-09-03
2011-11-22
Hughes, S. Thomas (Department: 3731)
Surgery
Instruments
Internal pressure applicator
Reexamination Certificate
active
08062328
ABSTRACT:
Retrievable vena cava filters for the temporary or permanent prevention of Pulmonary embolism (PE) are disclosed. A filter in accordance with the present invention has a tube-within-tube structure with overlapping semi-spheres. The semi-spheres comprise a plurality of expandable legs. The first tube may have a first set of expandable legs and a plurality of slots allowing for deployment of a second or third set of expandable legs on the second tube. The free end of each leg in the first set of expandable legs is oriented in a direction opposite to the free end of each leg in the second set forming a cage which comprises legs from the first and second sets of expandable legs. The filter of the present invention may be retrieved by a catheter and snare. The third set of expandable legs conveys the vector force from the closing of the first set to the second set to cause it to collapse.
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Eastwood David
Hughes S. Thomas
Merit Medical Systems Inc.
Stoel Rives LLP
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