Spring coil and manufacturing process thereof

Abstract

The invention discloses a spring coil. The spring coil comprises an outer-layer ring assembly and an inner-layer ring assembly which both comprise a plurality of petaloid units. The spring coil has the advantages that as the spring coil is released from a conveying pipe, a base ring is formed by the spring coil at first, then an outer-layer ring is formed, after the outer-layer ring is completelyformed, the spring coil continues to be released to form the inner-layer ring assembly, and after the inner-layer ring assembly is completely formed, the spring coil is in a two-stage state of a complete flower shape or peach shape. The base ring and outer-layer ring of the spring coil can well adapt to the shape of aneurysm and form a buffer structure for the inner-layer ring assembly, and the formation of hernia is avoided; compared with the outer-layer ring, the inner-layer ring assembly has higher elastic potential energy, so that the spring coil in the two-stage state is unlikely to collapse and be twisted.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a spring coil and a manufacturing process thereof. Background technique [0002] Coils are permanent embolic implants, which have the advantages of less damage, easy identification, manipulation and release, and are widely used to seal hemangiomas. Coils can quickly endothelialize the aneurysm neck by reducing or blocking blood flow in the hemangioma, forming a thrombus surface or a thrombus block. [0003] The coil has a two-stage shape. When it is transported in the microcatheter, the coil presents a linear primary form. When the coil is sent out of the microcatheter, the coil presents a second-stage form, which is the final form of the coil. At present, the common secondary shapes of coils are cylindrical, conical, cubic, spherical, etc. These coils can effectively block aneurysms, but limited by the development of technology, these coils also have some shortcomings, ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the poor stacking density of the coils in the prior art; they are easy to collapse and stack, and cannot conform to the shape of the aneurysm well; the aneurysm after using the existing spherical coils is prone to appear a convexity similar to "hernia". In order to overcome such defects, the present invention provides a coil and its manufacturing process. The coil is composed of multiple petal-shaped units, which can well conform to the shape of the aneurysm, avoid the formation of "hernia", and make the secondary shape The spring coil is not easy to twist and collapse

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