Catching device for foreign matter in blood vessel and catching method thereof

Abstract

A catching device for foreign matter in a blood vessel is composed of a micro guide wire A and a micro guide wire B. The micro guide wire A is magnetic, the micro guide wire B has ferromagnetism and is non-magnetic, and the catching device is formed by matching the micro guide wire A and the micro guide wire B. The invention further provides a catching method of the catching device. The method comprises the steps that firstly, the micro guide wire A penetrates through a clearance of the shifted foreign matter; then, the micro guide wire B penetrates through other clearances of the shifted foreign matter; then, the tail end of the micro guide wire A is used for attracting the tail end of the micro guide wire B, the two micro guide wires are rotated at the same time, and the shifted foreign matter is tightly wound and entangled; finally, the two micro guide wires are pulled out at the same time, and the foreign matter is pulled out of the blood vessel. The device and method are suitable for the situation that in endovascular intervention operations, spring rings and other operational materials shift and fall off to block the normal blood vessel, and the catching device catches the foreign matter firmly, easily, conveniently and safely, safe and good in operation stability, low in damage to the blood vessel, and suitable for micro blood vessels capable of being reached in all the interventional operations.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a fishing device for foreign matter in blood vessels and a fishing method thereof. Safe and easy removal of such intravascular foreign bodies to avoid cerebral infarction caused by blood vessel blockage. Background technique [0002] Intracranial aneurysm is a common cerebrovascular disease with high mortality and disability. Currently, there are two treatment methods for intracranial aneurysms, namely, surgical clipping or endovascular embolization. After the invention of electrolytic coils in 1991, the latter has now become an important method for the treatment of intracranial aneurysms. At present, it has become the preferred treatment method for most aneurysm patients in developed countries such as Europe and the United States, and it has also been developed and popularized in my country. [0003] Although interventional embolization of intracranial aneurysms is ch...

AI Technical Summary

Problems solved by technology

[0005] 1. The design of the micro lasso is similar to that of a lasso. After the lasso protrudes from the outer casing, the lasso ring is opened. After the target enters the lasso ring, the target can be captured by tightening the lasso ring. It is difficult to fully open the ring in the small distal intracranial blood vessels. If the displaced foreign body is densely clustered, it is difficult to be caught, and the fishing is more accidental;

[0006] 2. The micro-clamp design is mainly used to catch foreign bodies in peripheral large blood vessels, and occasionally used to catch foreign bodies in large and medium intracranial arteries, but its complicated mechanical design makes its ends stiff, which is less likely to damage fragile cerebral vessels. It is large and requires a large space to fully open, and it is also not suitable for the slender cerebral blood vessels at the end;

[0007] 3. The design principle of the spiral corkscrew-shaped catcher is similar to that of a corkscrew corkscrew. The main purpose is to catch thrombus in the artery. It can only be used in the larger internal carotid artery and proximal middle cerebral artery in the brain. The end is also relatively stiff, and it is not suitable for small distal cerebral blood vessels;

Moreover, the mechanical design of the terminal is complicated and stiff, with poor passability and requires a large space to operate. If the operation is improper, foreign objects such as coils will be pushed into smaller arteries, which will not be able to catch and cause permanent damage.

[0009] In recent years, the number of interventional aneurysm operations has increased rapidly, and the number of incidents of coils and other surgical materials falling off has gradually increased accordingly. However, from the perspective of current medical technology, there is no ideal fishing device

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