Inferior vena cava filter recovery device and method

Abstract

The invention discloses an inferior vena cava filter recovery device and method, wherein the recovery device comprises, includes a recovery unit and a capture unit, the recovery unit includes a sheathcore tube, a retrieval catheter and a retrieval sheath, the proximal end of the recovery catheter is provided with a first locking member, the proximal end of the recovery sheath tube is provided with a second locking member, the distal end of the sheath core tube is provided with a through hole for circulating contrast agent. The catching unit comprises a handle located at the proximal end, a snare located at the distal end, a guide wire assembly respectively connected with the snare and the handle, and a sleeve sleeved with the guide wire assembly, the sleeve penetrating the recovery catheter, the guide wire assembly comprising a straight guide wire portion connected with the handle, and a flexible guide wire portion connected with the snare. At least that invention has the advantage that the recovering end of the inferior vena cava filter is easily captured, the filter can be safely withdrawn from the recovering sheath tube, and the structure is optimize.

Description

Technical field [0001] The present invention relates to the technical field of medical devices, in particular to an inferior vena cava filter recovery device and method. Background technique [0002] Pulmonary embolism (abbreviated as pulmonary embolism, PE) is caused by peripheral deep vein thrombosis or thrombus in the right heart cavity that falls off into the pulmonary circulation, blocks the pulmonary artery or its branches, and then triggers a series of clinical pathophysiological changes mainly pulmonary circulatory dysfunction. Severe cases can cause sudden death. Studies have shown that the emboli that causes PE are mainly derived from thrombi that fall off the deep veins of the limbs or pelvic veins, accounting for 60% to 90% of the sources of emboli. As a result, a filtering device can be placed below the level of the renal vein opening to intercept free emboli in the blood, which can effectively prevent the occurrence of pulmonary embolism. At present, this technolog...

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Problems solved by technology

However, it is often found clinically that it is difficult for the catcher snare to trap the recovery end of the inferior vena cava filter, and the filter is easy to get stuck in the recovery sheath; for the situation where it is difficult to trap the recovery end of the inferior vena cava filter, it is found that the catcher snare used is round Ring-shaped, with a protrusion at the front end, and the material of the snare is stainless steel. During the operation, the stainless steel snare has poor flexibility and poor shape memory effect, which prolongs the operation time and brings great inconvenience to the surgeon and the patient. Radiation damage; the filter is easy to get stuck in the recovery sheath, because the sheath and the catheter adapter are connected physically, that is, the flared sheath is pressed on the catheter adapter with a nut, and the anchor of the filter is often stuck. The filter cannot be withdrawn from the retrieval sheath in the gap between the sheath and catheter adapter

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