The disclosure provides an implantable medical device comprising a material capture element, which has a generally closed conical deployed shape and a narrow end disposed at or proximate the first end of the device. The material capture element includes a wide end facing the second end of the device, the material capture element having a zone of wider radial dimension which provides a first vessel contact site. A plurality of wire tethers are coupled to the wide end and extend to the second end. The wire tethers define a substantially open passageway for blood and provide a second vessel contact site. The first and second contact sites are spaced longitudinally from one another to provide stability. A first retrieval element is disposed at the first end and coupled to the narrow end, while a second retrieval element is disposed at the second end and coupled to the wire tethers.