A Safety and Efficacy Study for Implantation and Retrieval Procedures Using the VENATECH® Retrieval Filter System

Inclusion Criteria: * Pulmonary thrombo-embolism with contraindication to anticoagulation. * Failure of anticoagulant therapy in thrombo-embolic diseases. * Prevention of pulmonary embolism in patients with a recent history ( \<3 months) of DVT/ PE who need to undergo urgent surgery at high risk of DVT/PE with temporary contra-indication to the use of therapeutic doses of anticoagulants. * Emergency treatment following massive pulmonary embolism where anticipated benefits of conventional therapy are reduced and * Chronic, recurrent pulmonary embolism where anticoagulant therapy has failed or is contraindicated Exclusion Criteria: * The filter should not be implanted in patients with : * A vena cava which has a diameter \< 14 mm or \> 28 mm (due to the risk of device migration) * Risk of septic embolism * Known allergy to the materials contained in the kit, allergy to contrast media. * Severely disabled patients whose life-expectancy, up to 6 months, appears limited according to the investigator's opinion. In addition, exclusion criteria are also extended to : * Patients who cannot be regularly followed up by the participating center * Subject who already has an implanted vena cava filter * Subject who has a duplicated IVC * Subject who has a contrast allergy to both iodinated contrast and non-iodinated contrast material * Subject unable to understand information about participation in the study due to a language barrier, intellectual deficiency, psychiatric problems… * Subject who has a renal failure (creatinemia clearance \< 30ml/min)