Downward moving device for stent anchoring area

Abstract

The invention provides a downward moving device for a stent anchoring area, and relates to the technical field of medical apparatus and instruments. The downward moving device comprises an outer-layer skeleton and an inner-layer guide piece, wherein the outer-layer skeleton is tubular as a whole and comprises an expanding section, and the diameter of the expanding section is gradually increased from the near end to the far end; the radial circumferential surface of the expanding section is covered with a covering film; the inner-layer guide piece comprises a near-end guide piece; the near-end guide piece adopts a covered stent or a covering film; the near end of the near-end guide piece is connected to the near-end edge or the near-end inner circumferential surface of a near-end connecting portion; and a first guide cavity is formed in the near-end guide piece. In an implanted state, the outer-layer skeleton penetrates through a tumor cavity, the outer-layer skeleton is fixed inside the tumor cavity through a supporting fixing portion arranged on the outer-layer skeleton, the expanding section is located inside the tumor cavity, and the outer circumferential surface of the expanding section is attached to the inner surface of the near end of the tumor cavity. According to the downward moving device, the technical problems that in the prior art, when an abdominal aortic aneurysm is treated through an EVAR technology, complications such as displacement and Ia-type endoleak are prone to occurring after the covered stent is implanted are at least solved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a device for moving down an anchoring area of ​​a stent. Background technique [0002] At present, in the treatment of abdominal aortic aneurysm by EVAR technology (Endovascular Aneurysm Repair, EVAR, endovascular repair), if the anchoring area of ​​the stent is insufficient or the angle of the tumor diameter is too large, migration of the stent graft after implantation is very easy. Complications such as position and type Ia endoleak will lead to continued arterial blood perfusion in the abdominal aortic aneurysm, and the blood pressure on the aneurysm vessel wall will greatly reduce the postoperative effect of EVAR surgery, and even cause EVAR surgery to fail. Contents of the invention [0003] The purpose of the present invention is to provide a device for moving down the stent anchoring area, which at least alleviates the problems existing in the prior art: when the...

AI Technical Summary

Problems solved by technology

[0002] At present, in the treatment of abdominal aortic aneurysm by EVAR technology (Endovascular Aneurysm Repair, EVAR, endovascular repair), if the anchoring area of ​​the stent is insufficient or the angle of the tumor diameter is too large, migration of the stent graft after implantation is very easy. Complications such as position and type Ia endoleak will lead to continuous arterial blood perfusion in the abdominal aortic aneurysm, and the wall of the aneurysm still has to bear blood pressure, which will greatly reduce the postoperative effect of EVAR surgery, and even cause EVAR surgery to fail.

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