Transfemoral artery valve conveyor

Abstract

The invention discloses a transfemoral artery valve conveyor which comprises an inner core tube assembly and an inner sheath tube assembly. And an outer sheath assembly; the inner core tube assembly is provided with an inner core tube which is arranged in the inner sheath tube assembly in a penetrating mode, the periphery of the far end of the inner core tube is sleeved with a spiral elastic piece, and the spiral elastic piece is sequentially provided with a head section, a far transition section, a supporting section, a near transition section and a tail section from the far end to the near end. The screw pitch t of the supporting section is 0; the screw pitch t (far) of the far transition section, the screw pitch t (near) of the near transition section and the screw pitch t (tail) of the tail section are respectively 2.5-3.5 times, 1.2-3 times and preferably 1.3-2 times and 0.8-1.2 times of the screw pitch t (head) of the head section. The spiral of the middle supporting section is arranged to be the densest form, the head section and the tail section are slightly compact, and the spiral of the far transition section and the spiral of the near transition section are arranged to be sparse, so that under the condition that the elastic piece has certain supporting force, conveying failure caused by transition bending of the head section and the tail section is avoided. And a balance state can be appropriately achieved between supporting and bending.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a transfemoral valve delivery device. Background technique [0002] With the prolongation of human life span and entering an aging society, aortic valve disease has become one of the more common valve diseases. In western developed countries, the incidence of calcified aortic stenosis is second only to hypertension and coronary heart disease, and has become the primary cause of valve replacement in the elderly. Surgical aortic replacement has long been the mainstay of treatment for symptomatic aortic stenosis. However, due to the large trauma of traditional surgery, extracorporeal circulation is required, and the risk of surgery is high. A large number of patients give up surgical treatment due to fear of surgery due to advanced age, poor ventricular function, and serious complications. [0003] Transcatheter aortic valve replacement (TAVR) is a new type of ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the technical problem that the distal outer tube of the delivery sheath in the prior art is not easy to bend over the aortic arch to reach the aortic valve, and aims to provide a transfemoral valve delivery device

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