Dense net support capable of achieving accurate positioning

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to the field of A61F2 / 90, in particular to a dense net support capable of achieving accurate positioning. The dense net support capable of achieving accurate positioning is characterized by comprising a support body and developing points; the support body is of a dense net cylindrical structure formed by weaving a plurality of weaving wires in a staggered mode, and the support body comprises a contraction state and a self-expansion state; the developing points comprise end developing points and middle developing points, the number of the end developing points is two, the two end developing points are fixedly arranged at the two ends of the axis of the support body, the number of the middle developing points is two, the two middle developing points are arranged in the middle of the support body, and when the support body is in a contraction state, the distance between the two middle developing points in the axial direction is set to be the length of a tumor diameter opening. The problem that precise positioning cannot be achieved due to axial retraction occurring during self-expansion of a dense net stent in a blood vessel is solved.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to the field of A61F2 / 90, in particular to an accurately positioned dense mesh support. Background technique [0002] Intracranial aneurysms are mostly abnormal bulges that occur on the walls of intracranial arteries, and are the number one cause of subarachnoid hemorrhage. In cerebrovascular accidents, they rank second only to cerebral thrombosis and hypertensive cerebral hemorrhage. three. The dense mesh stent has an irreplaceable clinical position in the treatment of intracranial aneurysms due to its advantages of simple operation and good therapeutic effect. However, since most of the dense-mesh stent products are woven, a high metal coverage rate is required to achieve a good diversion effect, and a high metal coverage rate will bring a large shortening rate of the stent; The shortening rate leads to extremely difficult positioning during stent re-deployment. [0003...

AI Technical Summary

Problems solved by technology

However, since most of the dense-mesh stent products are woven, a high metal coverage rate is required to achieve a good diversion effect, and a high metal coverage rate will bring a large shortening rate of the stent; Shortening rate leads to extremely difficult positioning during stent re-release

[0003] The Chinese patent with the publication number CN205391220U discloses a dense mesh bracket with holes. Similar to the above-mentioned patent, the dense mesh brackets currently on the market mainly have the following problems: (1) the current bracket uses developing wire and superelastic wire It is made of mixed weaving, and the whole body of the stent is visualized, but because the developing wire is thin, it is not easy to clearly observe when it is released, and it is not easy to release the stent during the operation; Shortening, the whole stent is longer when the stent is in the microcatheter or introducer sheath, and the stent becomes much shorter after release, which will cause the stent in the compressed state in the front sheath of the stent release to completely block the aneurysm neck, but After the stent is fully released, the stent becomes shorter and the stent does not block the neck of the aneurysm. This phenomenon is particularly prominent in large or giant aneurysms. This not only makes the device unable to achieve a good drainage effect, but may occur in severe cases. The head of the stent enters the aneurysm, causing serious problems such as rupture of the aneurysm; (3) For the problem mentioned in 2, the current solution is to increase the length of the stent, and the too long stent has a large section of the neck of the aneurysm, and the excess Partial and possible occlusion of normal perforating vessels, causing complications

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