A recyclable filter and filter pushing device

Abstract

The application discloses a recyclable filter, comprising: recovery hooks, a plurality of upper pillars, a plurality of lower pillars. The circumferential direction of the hook extends obliquely, and the inclinations of the upper strut and the lower strut are different; the ends of the upper strut and the lower strut away from the recovery hook are respectively provided with upper barbed hooks for fixing to the blood vessel wall , the lower thorn hook; the lower pillar is provided with a recovery structure that facilitates the recovery of the recyclable filter, so that during recovery, the apex of the lower thorn hook is below the cut surface of the highest point of the lower pillar; the lower pillar is close to One side of the lower thorn hook is provided with a groove, so that when the retrievable filter is deployed, the lower thorn hook can penetrate into the blood vessel wall. The present application also provides a filter conveying device. The recyclable filter provided by the present application can enable the filter to be recovered smoothly.

Description

technical field [0001] The present application relates to the technical field of medical devices, in particular to a retrievable filter and a filter pushing device. Background technique [0002] The vena cava filter is a filtering device designed to prevent pulmonary embolism caused by emboli in the inferior vena cava system. Three types of vena cava filters have appeared in the market successively, namely permanent, temporary and optional recyclable vena cava filters. Permanent vena cava filters reduce the incidence of fatal pulmonary thromboembolism (PTE), but over time increase the risk of recurrent deep vein thrombosis (DVT) and may lead to inferior vena cava embolism and a A series of complications, including filter perforation, detachment, migration, and filter fracture, can pose a permanent threat to the patient. [0003] In order to solve the clinical defects of permanent vena cava filters, temporary vena cava filters came into being. After such products are insert...

AI Technical Summary

Problems solved by technology

The removal rate of retrievable vena cava filters only accounted for 48% (from 11% to 100%) of the total number of filters inserted, and the lower removal rate of retrievable vena cava filters was mainly related to the following factors: In order to facilitate recovery, the retrievable vena cava Filters need to be designed with features such as soft hooks, collapsed components, and unconstrained stents, but these features can lead to unwanted filter migration, tilting, deployment difficulties / failures, retrieval difficulties, inferior vena cava penetration, etc., which are undesirable Events increase the difficulty of filter recycling, which can cause life-threatening to patients; as of 2016, 2006 cases of adverse events were reported to the US FDA, including 253 cases of filter / fragment shedding, 215 cases of filter / fragment migration, and deployment difficulty / failure 213 Cases, 154 cases of difficult removal, 118 cases of material perforation, 95 cases of filter tilt, and filter breakage, expansion failure and some unexplained adverse events, etc.

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