Vena cava filter

Abstract

The invention relates to the technical field of cardiovascular system medical instrument structures, in particular to a vena cava filter. Comprising a central pipe; the hook part is arranged at the end part of the central pipe and is used for taking out the filter in a matched manner; the umbrella-shaped part comprises a plurality of outer supporting rods, one ends of the outer supporting rods are rotationally connected to the central pipe, and the other ends of the outer supporting rods can be opened and closed to form an umbrella-shaped structure; the supporting part comprises a plurality of inner supporting rods corresponding to the outer supporting rods, and one ends of the inner supporting rods are rotationally connected to the outer supporting rods; the driving part is of a piston type structure and comprises a cylinder body and a piston arranged in the cylinder body; the piston is sleeved on the central pipe, and one axial side of the piston is connected with the other end of the inner supporting rod; the cylinder body is located on one side of the piston to drive the piston to move axially so as to drive the inner supporting rod to adjust the opening angle of the outer supporting rod. The filter is simple in structure, adjustable in opening diameter, capable of adapting to blood vessels of different sizes, better in adaptability, easy to operate and high in safety.

Description

technical field [0001] The invention relates to the technical field of cardiovascular system medical device structure, in particular to a vena cava filter. Background technique [0002] The mortality rate of large-scale pulmonary embolism is 50%. Pulmonary embolism is mainly caused by deep vein thrombosis of lower extremities, and 12% to 16% of pulmonary embolism is accompanied by deep vein thrombosis of upper limbs. The use of vena cava filter has become a direct way to prevent fatal pulmonary embolism. and effective method. A vena cava filter is shaped like an open umbrella or bird's nest. Vena cava filters can be divided into permanent and retrievable filters according to the length of time they remain in the body. For example, the Chinese utility model patent with the patent number of "CN209574959U" named "a double-layer recyclable thrombus filter", this patent introduces a filter, which consists of a recovery hook, an upper connecting pipe, an upper support rod, a bar...

AI Technical Summary

Problems solved by technology

Both the existing filter and the retrievable thrombus filter described above have the problem of invariable and non-adjustable diameter, which is not suitable for large changes in the vena cava. This filter with a relatively fixed diameter directly enters the vena cava. If it is too large, it may cause the risk of vein rupture, if it is too small, it will cause the problem of the filter falling off. The scope of the filter of the traditional model is relatively narrow

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