Biconical vena cava filter system for temporary use

Abstract

The invention discloses a biconical vena cava filter system for temporary use. A filter main body includes three parts, namely a filtering portion, a fixing portion and tail fibers, wherein the filtering portion is represented as a conical spring structure; the fixing portion is a conical spring structure; and the filtering portion and the fixing portion follow smooth connection by virtue of a memory alloy wire. The filter main body is formed by implementing heat treatment setting on a memory alloy wire on a special mold; a round ball is fixed to a circle of spring, which has the largest diameter, in conical springs of the filtering portion and a round ball is fixed to a circle of spring, which has the largest diameter, in conical springs of the fixing portion. The filter (the filter system) further comprises a threaded connecting component and an extension wire. With the adoption of a biconical structure, the filter can achieve smooth release and recovery, and contact points of the filter with a vascular wall are reduced; the filter, which is fixedly located within the inferior vena cava in a double-layer and multi-spherical-point mode, can prevent injury of blood vessels as well as hyperplasia and climbing of endangium; and the filter, even being implanted for a long time, can be smoothly withdrawn.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a temporary vena cava filter system. Background technique [0002] Currently, the incidence of deep venous thrombosis (deep venous thrombosis, DVT) and pulmonary thromboembolism (pulmonarythromboembolism, PE) is increasing day by day. As the most serious complication of DVT, PE has very high morbidity and mortality. Pulmonary thromboembolism not only has a very high morbidity and mortality rate, but also has a sudden onset and rapid progression. Generally, patients with pulmonary thromboembolism die within the first hour of onset. Pulmonary thromboembolism also leads to chronic pulmonary hypertension, which seriously affects the lives of patients. quality. [0003] DVT of the lower extremities is the main cause of PE, and literature reports show that about 60% to 70% of patients with DVT of the lower extremities will develop pulmonary thromboembolism. Studies have also shown tha...

AI Technical Summary

Problems solved by technology

At the same time, the invention also solves the problem of loading and taking out, so that the loading system enters and exits the inferior vena cava smoothly; and reduces the damage to the vessel wall during operation

Images