Stent vessel and dedicated traction tool for implanting stent vessel into human body

Abstract

The invention relates to a stent vessel for interventional therapy and a dedicated traction tool for implanting the stent vessel into a human body. The stent vessel comprises an artificial or animal vessel and support rings, wherein the support rings in three structures are used for fixation and respectively arranged at the outlet end and the inlet end of the artificial or animal vessel, and in the support rings, a detachable support ring with radial resilience force is further provided. The dedicated traction tool is especially suitable for dragging a Y-shaped stent into circuitous or narrow parts of the human body. The stent vessel provided by the invention is extremely flexible and easy to be implanted into a branch vessel until to the circuitous part. Because the main part and the branch of the stent vessel are integrated, the stent vessel is easy to position and safe and reliable without leakage after being implanted into the human body; and as the structure is simple and the cost is low, stent vessels in various diameters, variable diameters and lengths are be made, and the application range is wide because of no limit to lengths.

Description

technical field [0001] The invention relates to the field of medical stent blood vessels, in particular to a stent-type blood vessel in a human blood vessel for interventional treatment and a special traction tool for implanting it into a human body. Background technique [0002] In medicine, interventional therapy is commonly used in the treatment of aneurysms in various parts of the human body. Because it is minimally invasive, simple, safe, and effective, it has quickly gained a large number of people's adoption. When the size of the hemangioma is large, a stent whose size is larger than the length of the hemangioma in the blood vessel must be selected. Due to the tortuous direction of blood vessels in the human body and the size of blood vessels, stents with larger sizes cannot be implanted in the lesion. In addition, when the size of the hemangioma is large, no stent that meets the size requirements can be found. Existing Y-shaped bifurcated stents are manufactured i...

AI Technical Summary

Problems solved by technology

Due to the tortuous direction of blood vessels in the human body and the size of blood vessels, larger stents cannot be implanted in the lesion

In addition, when the size of the hemangioma is large, a stent that meets the size requirements cannot be found

Existing Y-shaped bifurcated stents are manufactured in sections, implanted in sections, and docked with each branch stent in the human body. This structure requires manufacturing accuracy, complicated operation, and long time. It requires precise operations in all directions, and docking Many interfaces affect reliability

[0003] The description of the Chinese patent "A Bare Intravascular Stent" (authorized announcement number CN101268971B) mentions: "Using a selective covered stent can avoid blocking the perforating branch while sealing the neck of the aneurysm, but the surgical positioning is difficult."

There are several existing surgical methods: 1. stent-assisted embolization of the aneurysm. After the stent is implanted in the parent vessel, the mesh of the stent is searched for with a guide wire, and the embolization of the aneurysm is performed through the mesh of the stent, and the mesh of the stent is searched for. operation is difficult

The second is to use a balloon to protect the auxiliary embolization of the aneurysm, which is cumbersome to operate, and sometimes there is still a risk of coil prolapse after the balloon is withdrawn; even for narrow-necked aneurysms, the use of coil embolization also needs to be packed one by one, which is cumbersome and expensive , and always accompanied by the problem of understuffing or overstuffing

2. The arrangement of multiple precise steel wires in a Z-shape and the one-by-one suturing of artificial blood vessels and its multiple technical requirements make this technology have high requirements for materials, technology, equipment, etc., and the manufacturing process is quite complicated, which makes the product cost high. The price of the product is expensive, which affects its promotion and use

In addition, the tumor cavity is empty, and the existence of this section of metal in the tumor cavity increases the load on the artificial blood vessel, which further affects the life of the artificial blood vessel and also affects the movement of the artery.

5. see figure 1 , 2 , 3, 4. When the diameter of the vessel is different or the stent is long or there are branch vessels, it needs to be transported in several sections, which makes positioning difficult, long operation time, many interfaces, and a high chance of bleeding

And because the operation time is long, patients and medical staff are exposed to X-rays for a long time

6. When PTFE is used as an artificial blood vessel, there is an aging problem. Usually, the aging life of PTFE material is about 30 years. This life may not meet the life requirements for young people.

7. The existence of the dense Z-shaped metal mesh and its own elasticity will inevitably make it have a certain hardness, and the axial direction is not compressible, so the flexibility cannot be very ideal

The description of the Chinese patent "A Kind of Intravascular Bare Stent" (authorized announcement number CN101268971B) mentions that the Neuroforn stent may also cause compression or occlusion of the perforating blood vessels near the aneurysm, and it may affect the positioning of the tortuous intracranial arteries such as the anterior cerebral artery and the like. There are still some difficulties and other problems in the release

There is another problem: the neck is a part of the human body with frequent activities and a large range of activities. Because this kind of inner bare bracket has a certain hardness, the movement of the neck is restricted and makes people uncomfortable.

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