| 摘要 |
<p>The invention discloses an extensible filtering sheath for surgical use for vena cava or large blood vessels. It consists of a sheath (2) formed by two radially extensible hollow tubular elements (5, 6), with a malleable, semirigid and self-extensible latticed wall, mutually linked by two peripheral longitudinal bars arranged to open up into a cone shape across the treated vessel, to form a filtering grid when one of these two elements, the supporting element (5) expands radially, the second expandable element remains compressed, but is shaped to be expanded subsequently so as to stop the filtering by completely clearing the passage of the treated vessel. It is generally useful for filtering or decreasing the blood flow to avoid certain necrotic lesions in tissues due to circulatory disorders caused by excessively high blood pressure, by thrombosis or clotting, and in particular for limiting the risks of infarction caused by the obstruction of the myocardium vessel by a clot or a foreign body carried by the blood circulating in the vena cava.</p> |
