Abstract:

The authors report 44 successful implantations of original retrieval Nitinol stent-filters, unique "closed" design of which comprehensively described in the article. All the devices placed for pulmonary embolism (PE) management in patients with lower extremity and pelvic deep vein (DV) thrombosis. Authors announce absolute efficiency of their stent-filters for PE prophylaxis, and the procedure itself declared to be safe and minimally invasive.

Stent-filter implantation into iliac veins compared to standard filter placement in inferior vena cava (IVC) excludes risks of total infrarenal IVC thrombosis - the major complication of such procedures. It is also associated with early DV recanalization, that in sum radically reduces disability rate. Moreover, in case of IVC abnormalities, kinking or external compression stent-filter into iliac position remains the only option for endovascular PE management. All the above can be mentioned as advantages of using stent-filters.

At the same time authors observe that stent-filters quick incorporation into vessel wall prevented endovascular retrieval of the device in quite a number of cases. Persistent PE threat, requiring prolonged antithrombotic therapy under endovascular protection, might also contribute for low retrievability of the device. 

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Abstract:

Eighteen experimental animals (9 rabbits and 9 mongrel dogs) were used in a feasibility study of heparin and a polymer belonging to polyoxyalkanoates class - homopolymer of в-oxybutyric acid - polyoxybutyrate (POB) to be applied onto the surface of the nitinole self-expanding stent "Alex" ("Komed", Russia) in order to decrease responsiveness of the vascular wall. During a three-month chronic experiment at various terms following implantation, we examined the degree of biocompatibility of the coat-free stents, heparin-treated stents, and those coated with the above polymer. The studies were carried out by means of arteriography, binocular light microscopy, histological examination, electron microscopy; and the study of the ultrastructure of thestented segmentsof the vessels. The experiments carried out on animals showed that: 1. The coating of the stents may positively influence structural alterations in the vascular wall, which improve the conditions of the blood flow along the vessel; 2. Using POB-coated stents is accompanied by lesser intimal hyperplasia, relatively decreased leukocytic infiltration, and development of vasa vasorum; 3. POB may safely be considered the most favourable coating for stents because of minimal structural alterations in the vascular wall. The obtained findings would make it possible to plan future research on polyoxyalkanoatesas modifiers of the histological responseof the vascular wall tissues while implanting stents.

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