Cerebral vessel distal-end protector and film coating method for same

Abstract

The invention belongs to the technical field of medical apparatus and instruments, and mainly relates to a cerebral vessel distal-end protector and a film coating method for the same. The cerebral vessel distal-end protector comprises an elastic protective net basket and a guide wire. The elastic protective net basket comprises a metal net basket body and a macromolecule thin film layer, the macromolecule thin film layer is coated on the metal net basket body, and holes are formed in the macromolecule thin film layer; a distal end of the guide wire is connected with a proximal end of the elastic protective net basket. The cerebral vessel distal-end protector and the film coating method have the advantages that the cerebral vessel distal-end protector has large vessel wall contact areas after being opened and is difficult to move under the impact of blood flow and thrombi; the thrombi larger than 0.05 mm can be intercepted when the cerebral vessel distal-end protector is used in cerebral vein interventional angioplasty, shifting or secondary embolism due to broken thrombi can be assuredly prevented, and the cerebral vessel distal-end protector further can be used for carotid artery interventional angioplasty and renal artery interventional angioplasty.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and mainly relates to a cerebrovascular distal protector and a coating method thereof. Background technique [0002] The distal protector (Embolic protection device) is mainly used in carotid artery stent interventional surgery (CAS) to collect plaque in the distal vessel of the lesion (intracranial internal carotid artery) to prevent distal cerebral vascular embolism. The technical problem to be solved by the distal protector is to collect solid particles, allow blood to flow through, and maintain blood flow during interventional operations. It is usually suitable for interventional procedures such as stent placement and balloon catheter expansion to prevent Particles such as plaque falling from the vessel wall during the intervention flow within the vessel, thereby avoiding the risk of thrombus formation. [0003] Existing distal protection devices are mainly divided into two categorie...

AI Technical Summary

Problems solved by technology

[0003] Existing distal protection devices are mainly divided into two categories: one is the distal balloon protection device, which is a guide wire with a balloon in the front section, which is opened during the operation to prevent blocky solids from slipping away, but this The technical disadvantage is that it blocks the blood flow and affects the blood supply to the distal tissue. If the operation takes a long time, it will cause ischemic necrosis of the distal cells; Accunet protectors and EmboShield protectors, Angioguard protectors from Cordis, Filterwire protectors from Boston, Aether remote protectors laser-cut by Shanghai Minimally Invasive Co. It also allows the passage of blood flow, so this type of remote protection device is also widely used in clinical

[0004] However, there are still many problems in the remote filter protection device that are worthy of people's consideration. During the process from its production to implantation in the human body, the more common phenomena include: when the product is thermally processed and finalized, and when the device is pressed into the sheath, local large Microstructural cracks caused by strain will eventually lead to structural breakage; self-expanding release, failure of the distal protection device to fully release or the stent part forcibly stretching the blood vessel, tearing and scratching the vessel wall; when capturing thrombus, due to blood flow and thrombus The shock causes the position of the remote protection device to shift, etc.

Images