Far end protecting device and its preparing method

Abstract

The invention discloses one kind of remote end protector and its preparing method. The technique problem to be solved is that collecting solid particle during operating, permitting the flow of blood, and decreasing outline size of protector. The remote end protector in this invention has filter, which is a basket with netting of contracting radial, setting godet bar along axial line, near end leg of basket with netting connects to godet bar, far end connects to godet head. The preparing method is that: 1. knitting mesh duct with NiTi alloy wire and platinum wire, holding at temperature 450~550deg.C; harnessing spring casing pipe to stainless steel wire or NiTi wire; 2. welding casing pipe and godet head, godet bar and casing pipe together. Compared with existing technique, the filter of remote end protector in this invention is basket with netting that can shrink into transport pipe along radian, decreases outline size of remote end protector, can be used to small blood vessel and serious stenotic pathological changes, brings more safe and efficiency for operation, particularly fits conveying to far end of target blood vessel by duct.

Description

technical field [0001] The invention relates to a medical device and a preparation method thereof, in particular to an intravascular distal end protector used for interventional treatment of vascular stenosis or other operations that may cause distal blood vessel embolism and a preparation method thereof. Background technique [0002] At present, interventional methods are often used in the treatment of vascular stenosis, such as balloon dilation, rotary cutting, thrombus extraction, stent implantation, etc. During the operation, plaque and blood clots will break and fall off, resulting in emboli. These emboli will be carried away by the blood flow, enter the terminal (distal) end of the blood vessel along the direction of the blood flow, block the distal vascular system, and block arterial blood from entering the brain, heart or other vital organs. This embolism can lead to cerebral infarction, Myocardial infarction, pulmonary embolism, and even death. The distal protector...

AI Technical Summary

Problems solved by technology

[0003] There are two main types of existing distal protectors: one is distal balloon protectors, such as Percuserge from Medtronic and Naviballoon from Kaneka, which is a guide wire with a balloon at the front end. Opening the balloon can effectively prevent the solid particles from flowing away; however, while preventing the solid particles from flowing away, it also blocks the blood flow and affects the blood supply to the distal tissue. When the operation takes a long time, it will cause ischemic necrosis of the distal cells.

The other is an umbrella-shaped filter with a filter membrane, which covers the filter membrane on an umbrella-shaped support, such as Johnson & Johnson's AngioGuard, Boston's Filter Wire EX, Guidant's Accunet, and Abbott's EmboShield; The advantage of the protector is that it can not only collect solid particles, but also allow blood to flow through and maintain blood flow. Dimensions are easy to cause thrombus to fall off, and the protector cannot play a role

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