Interventional cardiac valve conveying device capable of repeating positioning

Abstract

The invention discloses an interventional cardiac valve conveying device capable of repeating positioning. The device comprises a core tube, a guiding head and a fixing head are fixed to the core tube, and an interventional cardiac valve mounting position is arranged between the guiding head and the fixing head; the outer periphery of the interventional heart valve mounting position is provided with an axially slidable outer sheath tube and a floating limit strip, the proximal end of the floating limit strip is a fixedly arranged start end with respect to the fixing head or the core tube, anda movable limit strip floats between the interventional cardiac valve mounting position and the outer sheath tube; the outer wall of the fixing head is provided with a positioning portion for cooperating with a connecting ear of an interventional cardiac valve, and before the connecting ear is completely released out the outer sheath tube, the floating limit strip is bound by the outer sheath tubeto maintain cooperation between the connecting ear and the positioning portion; the outer sheath tube includes an inner layer, an intermediate layer and an outer layer in order from inside to outside, the intermediate layer includes, from the distal end to the proximal end, a first segment, a second segment and a third segment, the first segment is of a hollow structure, and the hollow structureincludes at least two hollow units.

Description

technical field [0001] The invention relates to the field of medical devices, and more specifically, the invention relates to a delivery device for implanting an artificial heart valve into the heart. Background technique [0002] Heart valvular disease is one of the most common heart diseases in my country, mainly due to valvular damage caused by rheumatic fever; in recent years, with the development of population aging, valvular degeneration (including calcification and mucus degeneration, etc.) Damage is also increasing in our country; in addition, congenital valvular disease is also one of the common causes of heart disease. A considerable number of patients with high risk of valvular heart disease, such as severe valvular insufficiency, elderly patients who are not suitable for surgical valve replacement, advanced tumors and valvular insufficiency, need new interventional methods with less trauma. Interventional heart valves were developed under the inspiration of surgi...

AI Technical Summary

Problems solved by technology

However, the problem of sudden and complete release of the valve stent due to excessive elastic force during the release process still cannot be solved, and the valve stent after being released in place cannot be adjusted in position or placed in place again, which not only requires extremely high control accuracy during surgery. high, and there are certain risks

[0006] Not only that, the existing outer sheath tubes used to deliver interventional heart valves are mostly made of polymer materials. Although the properties of polymer materials are good, their elasticity and strength are poor.

At present, although there are also methods of applying reinforcing materials to polymer materials, such as braided mesh tubes or elastic tubes for reinforcement, polymer materials are coated on the inside and outside of the reinforcing tube to form an outer sheath tube, but the above measures only increase The bending resistance and pressure-bearing properties of the outer sheath have not obviously solved the problems that the interventional heart valve is difficult to recover and the outer sheath is wrinkled when the outer sheath is retracted to the interventional heart valve

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