Spring ring of embolic intracranial aneurysm and manufacturing method of spring ring

Abstract

The invention provides a coil for embolizing an intracranial aneurysm and a manufacturing method thereof. The spring coil includes a network tube braided by polymer filaments and a metal core wire passing through the network tube. The method includes the following steps: weaving the mesh pipe; winding the metal core wire; heat-treating the metal core wire at high temperature to shape; assembling the metal core wire through the mesh pipe to form a coil; Smooth spherical surface, the proximal end of the spring coil is fixedly connected with the metal core wire, the mesh tube and the connector. It can be seen from the above scheme that the network tube made of high molecular polymer can effectively induce the formation of thrombus in the aneurysm, accelerate the embolization of the coil, shorten the embolization time of the aneurysm, and reduce the recurrence rate of the aneurysm; the metal core wire has good Elasticity and shape memory function, strong anti-untwisting, can maintain the original shape after being sent into the aneurysm, the coil will be more stable in the aneurysm, it is easier to fill the aneurysm space, and further accelerate aneurysm embolization.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a coil for embolizing intracranial aneurysms and a manufacturing method thereof. Background technique [0002] Intracranial aneurysm is a cerebrovascular disease with high morbidity and mortality, and it is the main cause of subarachnoid hemorrhage. The mortality rate of ruptured intracranial aneurysm is as high as 51%, and the disability rate of survivors is close to 50%. At present, there are two ways to treat intracranial aneurysms clinically: one is surgical craniotomy, which clips or ligates the aneurysm. The disadvantage is that the operation time is long and the patient is traumatized. It is also very difficult to treat aneurysms in special parts such as the trunk; the second is interventional endovascular treatment, which is minimally invasive, safe and effective, and has become the preferred clinical treatment plan for many medical experts. Under the guidance o...

AI Technical Summary

Problems solved by technology

At present, there are two ways to treat intracranial aneurysms clinically: one is surgical craniotomy, which clips or ligates the aneurysm. The disadvantage is that the operation time is long and the patient is traumatized. It is also very difficult to treat aneurysms in special parts such as the trunk; the second is interventional endovascular treatment, which is minimally invasive, safe and effective, and has become the preferred clinical treatment plan for many medical experts. Under the guidance of X-ray, the coil is embolized into the aneurysm cavity through the delivery catheter

[0003] The existing coils have the following disadvantages: 1. The material of the coils is platinum-tungsten alloy, which is very expensive; 2. The coils often have a low filling rate and a high recurrence rate. Clinical papers show that the recurrence rate of large aneurysms It is about 45%; 3. Platinum and its alloy coils are heavy. For large aneurysms, a large number of packing coils are likely to cause mass effect or mass effect, which has a compressive effect on surrounding tissues and blood vessels; 4. Poor shape memory function After it is sent into the aneurysm, the shape of the coil cannot be determined, which may cause the situation that the aneurysm cannot be completely filled, resulting in the incomplete embolization of the aneurysm, and at the same time, the tail end of the coil may hang in the parent artery. 5. Although the coils applied to high molecular polymer materials can accelerate the embolization of aneurysms to a large extent, they also have the problems of poor visualization and easy untwisting under X-rays

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