| Author/Editor | Pavčnik, Dušan; Uchida, Barry T; Keller, Frederick S; Corless, Christoper L; Roesch, Josef | |
| Title | Retrievable IVC square stent filter: experimental study | |
| Type | članek | |
| Source | Cardiovasc Intervent Radiol | |
| Vol. and No. | Letnik 22 | |
| Publication year | 1999 | |
| Volume | str. 239-45 | |
| Language | eng | |
| Abstract | Purpose: In vitro and in vivo evaluation of a new retrievable, home-made, inferior vena cava (IVC) Square stent filter (SSF) with two trapping levels. Methods: In vitro, the SSF was compared in a flow model with the stainless steel Greenfield filter (SGF) for emboli-trapping efficiency by serially passing 300 emboli of 3 and 6 mm in diameter and 15-30 mm in length in each type of filter. Nine swine were used for the in vitro testing of the SSF for deployment and retrievability, emboli-trapping efficiency, stability, and self-contering ability and two were used (total of 11 swine) for testing repositioning and retrievability of the SSF at 2 weeks and for gross and histologic IVC changes at 2 months. Results: In vitro, the SSF and SGF had similar efficiency in trapping large emboli but the SSF had significantly better efficiency than the SGF for trapping all sizes of emboli (91.7% vs 81%), medium size emboli (93% vs 80%), and small emboli (86% vs 69%). Efficiency decreased in both filters from the first to the fifth embolus in each series but was still significantly better for the SSF. Eith the SSF, 89% of emboli were caught at the primary and 11% at the secondary filtration level. In the nine animals used for acute studies, the SSF was easily placed in all 27 attempts, assumed a central position 26 times, and was easily retrieved in 21 of 22 attempts. One titled filter needed additional manipulation for retrieval. During emboli injection in five swine, the SSF had 97.2% emboli-trapping efficiency and demonstrated good stability. In the two animals used for longer-term evaluation, the filters were easily retrieved 2 weeks after implantation Histologic evaluation at 2 months showed neointimal proliferation around the SSF wires in contact with the IVC wall, which was otherwise normal. (Abstracts truncated at 2000 characters). | |
| Descriptors | VENA CAVA, INFERIOR VENA CAVA FILTERS EQUIPMENT DESIGN PULMONARY EMBOLISM STAINLESS STEEL SWINE |