Straight cylinder type metal cutting sheath

Abstract

The invention discloses a straight cylinder type metal cutting sheath which comprises a straight cylinder type metal cutting sheath body. The straight cylinder type metal cutting sheath body is provided with a vena cava filter recovery pipe, a vena cava filter recovery pipe groove and an annular cutting edge. The annular cutting edge is arranged at a sheath opening of the straight cylinder type metal cutting sheath body so as to be closely attached to the outer side of a vena cava filter metal rod, so the damage to blood vessel walls is small and few blood vessel wall tissue components are cutoff when the vena cava filter metal rod is stripped off. The propelling speed and amplitude of the cutting sheath can be controlled, so the vena cava blood vessel walls draw back to the outer side intime when adhesion tissue is cut off, the damage risk of the vena cava blood vessel walls is further reduced, and the operation safety is improved. The put-on sheath wall of the straight cylinder type metal cutting sheath has a small thickness, the situation that a recovered sheath embedded section cannot advance when the cross sectional area of a compressed vena cava filter and cut tissue is larger than the area of an inner cavity of the recovery sheath can be reduced or avoided, and it is avoided that the vena cava filter cannot be recovered.

Description

technical field [0001] The invention relates to the technical field of vena cava filter insertion, in particular to a straight metal cutting sheath. Background technique [0002] As a minimally invasive treatment that effectively reduces the incidence of fatal pulmonary embolism, vena cava filter placement has been widely used in clinical practice at home and abroad. The number of vena cava filters placed worldwide is as high as hundreds of thousands every year. Although most of the vena cava filters used are retrievable vena cava filters, the proportion of retrievable vena cava filters that can be removed actually does not exceed 10- 20%. The technical reasons for the low percentage of vena cava filter recovery are mainly that the vena cava filter is seriously adhered to the vessel wall and cannot be peeled off minimally, the recovery hook of the vena cava filter cannot be caught by the wall, and the thrombus in the vena cava filter is formed. In addition, patients who ca...

AI Technical Summary

Problems solved by technology

The technical reasons for such a low recovery ratio of vena cava filters are mainly that the vena cava filter is seriously adhered to the vessel wall and cannot be peeled off minimally, the recovery hook of the vena cava filter cannot be caught by the wall, and the thrombus in the vena cava filter is formed, etc.

In addition, patients who cannot perform percutaneous endovascular vena cava filter removal within the recovery time period recommended by the filter manufacturer due to various reasons will also lose routine minimally invasive surgery due to severe adhesion between the vena cava filter and the vessel wall. Chances of removing the vena cava filter

For such patients, if the vena cava filter must be removed, laparotomy or laparoscopic vena cava incision can only be used at present, and the trauma and surgical risk of this type of operation are high

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