Crossed overlapping vena cava filter

CN120324147BActive Publication Date: 2026-06-23THE THIRD XIANGYA HOSPITAL OF CENT SOUTH UNIV

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: THE THIRD XIANGYA HOSPITAL OF CENT SOUTH UNIV
Filing Date: 2025-04-18
Publication Date: 2026-06-23

AI Technical Summary

Technical Problem

Existing inferior vena cava filters cannot simultaneously meet the requirements of a long window period, good stability, easy capture and retrieval, and applicability to the superior vena cava, especially for patients with short superior vena cava vessels, and the existing filter structure is complex.

Method used

A cross-over superimposed vena cava filter is designed, which uses two intersecting filter screens. Each filter screen consists of a connector and multiple sets of interception units. The interception units are composed of arc-shaped structural rods and anchoring structures. The connectors are hollow and equipped with retrieval hooks. The material is elastic or shape memory material, which is suitable for the release and retrieval of the superior vena cava.

Benefits of technology

It achieves stable release and easy recovery of the filter in the superior vena cava, and features a long window period, good stability, and bidirectional release and retrieval. It is adapted to the length characteristics of the superior vena cava, has a simple structure, and is suitable for use between the superior vena cava, inferior vena cava, hepatic vein, and renal vein.

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Abstract

The present application relates to the field of medical devices, and discloses a cross-over and overlapped vena cava filter, comprising two cross-over filters, each filter comprising a connecting piece and three or more groups of intercepting units fixed to the connecting piece in a circumferential direction; each group of intercepting units comprising two arc-shaped structure rods, the connecting ends of the two arc-shaped structure rods being fixed to the connecting piece, the fixed ends of the two arc-shaped structure rods being fixed to each other, the fixed ends being provided with outwardly extending anchoring structures; the distance between the two arc-shaped structure rods decreases from the connecting end to the fixed end, and then increases from the fixed end to the connecting end; the two arc-shaped structure rods of each group of intercepting units of one filter penetrating through two adjacent groups of intercepting units of the other filter. The present application has a long window period, good stability, and is easy to capture and recover, and is suitable for superior vena cava.

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