Coil delivery system available for electrothermal release

Abstract

The invention provides a spring ring conveying system capable of being used for electric heat releasing, and belongs to the technical field of spring ring conveying systems. A waterproof gasket of the spring ring conveying system is arranged at one end of the interior of a heat shrinkage pipe; a second supporting spring is arranged at the other end of the interior of the heat shrinkage pipe; a conveying guide wire is arranged in a first supporting spring, a developing mark and a second supporting spring; the conveying guide wire is divided into five sections, and the second section and the fourth section are taper change areas; and the other three sections are sections with constant diameters. According to the spring ring conveying system, as the waterproof gasket is additionally arranged, perfect butt jointing is better achieved after an implantation part and the conveying system are assembled; the water inflow risks of an electric heat spring in the conveying process are greatly reduced; and the releasing stability is better improved. In addition, multi-section taper design of the conveying guide wire is further provided, so that different sections of the conveying system are different in rigidity; and the far end is quite soft, the near end is quite rigid, and the whole pushing performance of the conveying system is greatly improved.

Description

technical field [0001] The invention relates to a coil delivery system that can be used for electrothermal release, and belongs to the technical field of coil delivery systems that can be used for electrothermal release. Background technique [0002] Coil products have experienced development in the past few decades and have become one of the main means of embolization for the treatment of intracranial aneurysms. After several generations of product improvements, domestic and foreign coil products currently on the market are increasingly recognized by doctors. Divided according to the release principle of the coil, common coil products are mainly divided into electrofusion release (such as GDC coil products of Boston Scientific Company), electrothermal release (such as Microplex coil products of Microvention Company), mechanical release (such as ev3 The company's Axium coil products), water release (such as Cordis's TRUFILL DCS coil products) and other four categories. The...

AI Technical Summary

Problems solved by technology

[0003] The traditional GDC coil belongs to electrofusion release, the release time is relatively long, and the operation process is relatively cumbersome. Electrothermal release, mechanical release and water release are the mainstream release methods at present. Their common feature is that the release time is relatively short, usually within a few seconds. Done, these relief methods are loved by interventional doctors

[0004] The disadvantage of electrothermal relief is that when the inner cavity of the electric heating part is filled with blood or other liquids, it is difficult for the heat of the electric heating part to be effectively transferred to the polymer wire or hollow tube in the inner cavity, making it difficult or difficult to release relief

In US 2006 / 0052815A1 and US 2010 / 0268204 A1, a coil delivery system that can be used for electrothermal release is mentioned. Although the main structure and principle of the delivery system are described in detail in the US patent, but in its announcement In the delivery system, the electrothermal part (variable diameter spring) and the implanted part are directly connected together through polymer wires. Since the spring will have a certain angle during processing, the end of the spring will be uneven after being cut, so the implanted part After being assembled with the delivery system, the seal is not good; when the coil is delivered through the microcatheter, the catheter is filled with irrigation liquid, and if the seal between the implanted part and the delivery system is poor, the irrigation liquid will be in the Under pressure or friction resistance, it penetrates into the electric heating coil, and finally affects the release stability of the coil product

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