The article describes a cava filter "volan" suggested by the authors and the methods of its implantation through the subclavian or femoral vein for primary or secondary prevention of thromboembolism of the pulmonary arteries. The simplicity of the device, universality in size and character of its use for temporary and permanent percutaneous implantation, and the possibility of its application in peripheral nonspecialized therapeutic institutions are noted. The experience in its use in 93 patients with phlebothrombosis of the lower limbs and thromboembolism of the pulmonary arteries is discussed. In 38 patients with temporary implantation the filter was removed in 2 weeks to 6 months. The high effectiveness of the device and the method of its application is noted and wider indications for its use are recommended.