Manufacturing method of spiral bracket and spiral bracket

Abstract

The invention aims at providing a manufacturing method of a spiral bracket and the spiral bracket. The spiral bracket can prevent central deviation of a cover layer, and the correct position of a crosshead mould corresponding to the phase of a long screw can be set in a short time. The manufacturing method of the spiral bracket in the invention is as follows: a mould (8) in two section holes are fed by metal core wires (2), wherein the front part of the mould is a small hole (82) in long spiral forms through which metal wires can penetrate, the rear part is a big hole (83) with the inner diameter being greater than that of the above small hole (82). While the wire cores (2) are bent by the front part of the mould (8) into long spiral forms, the rear part of the mould (8) is coated by high polymer materials.

Description

[0001] This application is a divisional application, the filing date of the original application is August 1, 2005, the application number is 200510088686.5, and the title of the invention is the manufacturing method of the helical stent and the helical stent. technical field [0002] The present invention relates to a helical support for supporting insulated and covered electric wires and a manufacturing method thereof. Background technique [0003] In the conventional helical stent, first, the metal core wire is bent into a long helical shape by using a die provided with a long helical hole, and then the long helical metal core wire is introduced into a crosshead die of an extruder, and the entire surface of the metal core wire is Apply an insulating covering layer composed of a polymer material, and then cut the long spiral insulating covered wire into a predetermined length, and form a spiral stent with a predetermined shape such as a U shape in the middle part (refer to ...

AI Technical Summary

Problems solved by technology

[0004] However, when using the above-mentioned conventional method, the center of the covering layer may be shifted when forming a long spiral insulated covered wire.

That is, the crosshead die of the extruder is set at a specific phase position of the long helical metal core wire discharged from the long spiral forming die, and the coating layer is formed at the specific phase position, although when the position of the crosshead die is relatively long helical When the position of the coating is not correct, the center of the coating layer will deviate, but the phase of the long helix and the mutual position of the crosshead die may also deviate due to other reasons such as vibration during the forming process of the coating wire, so the coating layer may be formed. The center deviates from the product, or the problem of partial center deviation

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