SUPERELASTIC NITINOL CAVA-FILTER "KALEIDOSKOP" Russian patent published in 1999 - IPC

FIELD: medicine; surgery. SUBSTANCE: cava-filter is characterized by biological compatibility with organism tissues. It provides for access through peripheral and central veins due to small diameter of 1-1.5 mm in compact state. It is capable of retaining small thrombus migration due to uniform regulated arrangement of thrombus catching cells along vein section. Filter eliminates hazard of its displacement in caudal and cranial directions or shifting of filter axis with respect to axis of lower hollow vein due to presence of several supporting planes. It provided for intensity to oscillations at occurrence of blood counter flow because of formation of two supporting circumferences with locks and for reliable fixing without perforation of vein walls. Cava-filter contains wire elements made of titanium nickelide with locks-limiters on vacant ends. Wire elements are fixed by bushings with formation of blades. The latter are bent to form figure eight in longitudinal direction or shaped as six- or eight-point star crossed by paths of vacant ends in transverse direction. Vacant ends on one side of filter are shifted relative to vacant ends on the other side. EFFECT: improved design. 1 cl, 4 dwg