Production process of memory alloy rope for vascular stent

Abstract

The invention provides a production process of a memory alloy rope for a vascular stent. The production process comprises the following steps that 1, a paying-off reel is loaded with raw materials, and a bearing is arranged between the reel and a roller shaft; 2, a steel wire rope is produced by twisting; 3, the alloy rope is subjected to on-line annealing; and 4, a torque motor is used for taking up. According to the production process of the memory alloy rope for the vascular stent, the constant tension is adopted for paying off, and the bearing is arranged between the paying-off reel and the roller shaft, so that the movement in the paying-off process is smoother, the monofilament jolt is reduced, and the fracture of the monofilaments is prevented; and the torque motor is adopted, the taking-up tension is controlled in a certain range, a specific twisting production process is combined, and therefore the production process can adapt to twisting production of alloy monofilaments and alloy ropes with extremely small diameters, the twisting quality of the alloy ropes is ensured, and the production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of alloy rope production, in particular to a production process of memory alloy rope for vascular stents. Background technique [0002] Vascular stents are based on balloon dilatation of the lumen, and an internal stent is placed in the diseased segment to support the stenotic and occluded segment of the vessel, reduce the elastic retraction and reshaping of the vessel, and maintain the smooth blood flow in the lumen. Vascular stents are mainly made of Ni-Ti alloy materials, which are generally twisted with monofilaments with a diameter of about 0.09mm to form alloy ropes of various diameters. The main structures of the products are 1×2, 1×3, 1×7, 1×19 single-strand rope, and then used as the main material for the construction of the vascular stent. This kind of alloy rope has very strict requirements on the deformation temperature. When the temperature reaches a predetermined value, it must produce a prede...

AI Technical Summary

Problems solved by technology

Because the single wire diameter of the alloy rope is too small, during the twisting process, whether it is the single wire pay-off stage or the alloy rope twisting stage, it is very easy to break the wire, so the general steel wire rope twisting currently applicable Equipment and twisting process are all difficult to realize the twisting production of this memory alloy rope

[0003] For example, the current monofilament pay-off I-shaped wheel for alloy rope twisting is directly placed on the shaft roller, and the wire is released under the traction of the rope closing machine. The friction between the I-shaped wheel and the shaft roller is relatively large for general Steel wires with larger diameters will not cause substantial problems, but for monofilaments with extremely fine diameters, it is easy to form broken wires, especially when there are more monofilaments on the I-shaped wheel and the weight is larger; in addition, currently There is no constant tension control device on the rope closing machine. When the twisting process is restarted after an emergency stop, the monofilament with a very fine diameter is also prone to breakage in the state of one feeding and one tight.

These will have an adverse effect on the twisting of the entire alloy rope

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