Full-coated film degradable cerebrovascular stent and preparation method thereof

Abstract

The invention provides a full-coated film degradable cerebrovascular stent and a preparation method thereof. The full-coated film degradable cerebrovascular stent comprises a stent body, a film located on the inner surface of the stent body, and a coating located on the mesh-shaped pore part in the middle of the stent body and the outer surface of the stent body; and the film and the coating completely coat the surface of the stent body to form a woven mesh structure with a closed inner side, an open middle part and open outer side. The preparation method of the full-coated film degradable cerebrovascular stent comprises the following steps: coating a Teflon film on a mandrel; wrapping the Teflon film with the film; enabling the stent body to sleeve the film; forming the coating on the stent body; and performing high-temperature treatment on the full-coated film degradable cerebrovascular stent, then taking down the full-coated film degradable cerebrovascular stent from the mandrel, and removing the Teflon film. The stent body is completely coated with an elastic body, and plastic deformation generated after the stent is pressed, held and expanded can be reduced, so that the adherence capacity of the stent is improved, and the curative effect on cerebrovascular stenosis is improved.

Description

technical field [0001] The invention belongs to the field of implanted medical devices, and in particular relates to a full-covered degradable cerebrovascular stent and a preparation method thereof. Background technique [0002] Cerebrovascular stenosis is a common neurosurgical disease with complex and diverse etiologies, including arteritis nodosa, atherosclerosis, and cervical spondylosis. Cerebral vascular stenosis will lead to a series of ischemic symptoms such as dizziness, nausea and vomiting, visual vertigo, limb weakness, etc., which can easily induce stroke and even death in severe cases. A cerebrovascular stent is a stent implanted in a cerebral blood vessel to relieve cerebrovascular obstruction. At present, cerebrovascular stent implantation has become one of the important technologies for the treatment of cerebrovascular stenosis, which can effectively relieve cerebrovascular obstruction, improve the quality of life of patients, and has the advantages of easy ...

AI Technical Summary

Problems solved by technology

[0004] However, the mechanical properties of degradable materials are far inferior to those of permanent metal materials. Degradable cerebrovascular stents will undergo irreversible plastic deformation after being pressed into the delivery system, resulting in inability to fully expand to the diameter before being pressed.

Therefore, it is difficult for the degradable cerebrovascular stent to fit closely to the vessel wall of the lesion after implantation, not only cannot provide sufficient radial support force, but also is prone to displacement, leading to restenosis

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