Temporary filter with remote protector

Abstract

The invention discloses a high-safety and easy-to-recover temporary filter with a distal protector, which can be used to recover thrombus. It includes a sheath tube (1) and an expandable and variable-diameter filter screen (2) on the sheath tube (1). There is a fixer (3) at the rear end of the sheath tube (1). (1) The protective umbrella in the retracted state of the inner channel displacement has a recovery guide device that can be connected with the rear end of the sheath tube (1) at any time. The invention solves the problem that the thrombus is easy to fall off when the existing retrievable filter or the temporary filter is taken out, and the operation risk is reduced to the greatest extent.

Description

Technical field: [0001] The invention relates to an interventional medical device, in particular to a temporary filter with a distal protector suitable for thrombus recovery or a temporary filter placed along the direction of blood flow. Background technique: [0002] Pulmonary embolism has an acute onset, is prone to recurring, and has a high mortality rate. Recurrent small-area pulmonary embolism (involving less than 30% of the pulmonary vascular bed) can cause or aggravate respiratory diseases such as chronic pulmonary hypertension; large-area pulmonary embolism (more than 50% of the pulmonary vascular bed) can occur in a short It leads to death within a short period of time, and its case fatality rate is 30%. Most of the disease is secondary to peripheral venous thrombosis. The use of clinical filters is mainly aimed at high-risk patients within a limited period of time, especially those who cannot receive anticoagulant therapy or have complications after anticoagulant...

AI Technical Summary

Problems solved by technology

The existing temporary thrombus filter has the problem and risk of new thrombus falling off when it is recovered and taken out. This is because the filter is compressed into the sheath during the recovery process, and the deformation changes greatly from the fully expanded state to the compressed state. The intercepted thrombus will cut and break, and enter the pulmonary artery with the direction of blood flow, causing new pulmonary embolism or entering other blood vessels of the human body to cause embolism. Therefore, the filter must first dissolve all the intercepted thrombus before removing it. recovery, and the existing technology cannot completely dissolve the intercepted thrombus, often the filter with some thrombus is forcibly taken out, which can easily cause the thrombus attached to the filter or the broken thrombus generated during the contraction of the filter to fall off, resulting in Embolism of new vessels, increasing surgical risk

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