A system and method for precisely positioning distal and proximal post-release stent-graft delivery

Abstract

The invention discloses an accurate-positioning far and near-end back release film-coated support conveying system and method. The system comprises an outer sheath catheter, a middle tube, a core tube, a near-end release device, a far-end release device and a control release device, wherein a middle cavity of the middle tube is used for the core tube to pass through, cavities at two sides are respectively used for a rear-end release drawing wire and a far-end release drawing wire to pass through; the outer sheath catheter sleeves the middle pipe and can slide along the middle pipe, and the tail end of the outer sheath catheter is provided with a first handle; the near and far-end release devices with the near and far-end release drawing wires are used for respective connection with the near end and the far end of a film-coated support when the film-coated support is installed; and the control release device controls the release sequences of the near and far-end release devices through effects applied to the near and far-end release drawing wires. The system can ensure fixed installation positions and accurate positioning of the far end and the near end when the film-coated support is installed and prevents axial shrinkage after the film-coated support is installed and obstruction of a branch blood vessel close to a far-end cut due to far-end release inaccuracy.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a delivery system for delivering a covered stent in vivo for the treatment of arterial lesions, in particular a delivery system and method for a precisely positioned distal and proximal post-release covered stent. Background technique [0002] In the present invention, the term "proximal end" refers to the end close to the heart along the blood flow direction, and "distal end" refers to the end away from the heart along the blood flow direction. [0003] Using endoluminal isolation to treat aortic disease with covered stents is a major progress in the treatment of aortic diseases in recent years. Compared with traditional treatment methods, this technique has the advantages of mild trauma, fewer complications, and lower mortality. advantage. [0004] At present, endovascular exclusion mainly uses nickel-titanium alloy self-expanding stents to treat aortic lesions. The nickel-titan...

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