CN209734239U

CN209734239U - Intracranial bifurcation aneurysm stent

Info

Publication number: CN209734239U
Application number: CN201820982412.3U
Authority: CN
Inventors: 黄嘉平; 刘晓杰; 张伟东; 魏文卿; 郭雪可; 玄雪婷; 崔海坡; 程千莉; 王阳; 张春晓
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2018-06-25
Filing date: 2018-06-25
Publication date: 2019-12-06
Anticipated expiration: 2028-06-25

Abstract

The utility model relates to an intracranial branching department aneurysm support, including support subject, shutoff part, connecting rod and development point, the support subject is network structure, and the shutoff part is the flaring form, and the support subject is connected by the connecting rod with the shutoff part, the development point distribute in the afterbody of support subject near-end with the distal end of shutoff part. Compared with the prior art, the utility model discloses better solution to encephalic bifurcation department aneurysm seal, improved the validity and the security of treatment.

Description

intracranial bifurcation aneurysm stent

Technical Field

The utility model belongs to the technical field of medical instrument and specifically relates to an intracranial bifurcation department aneurysm support is related to.

Background

Intracranial aneurysms are mostly abnormal bulges on the wall of an intracranial artery, are the first causes of subarachnoid hemorrhage, and are second only to cerebral thrombosis and hypertensive cerebral hemorrhage in cerebrovascular accidents, and are the third cause. The disease can occur at any age, and most of the disease is better in middle-aged and old women of 40 to 60 years old. The causes of intracranial aneurysm are not clear, and most students think that intracranial aneurysm is caused on the basis of congenital defects of partial wall of intracranial artery and increased pressure in cavity, and hypertension, cerebral arteriosclerosis and vasculitis are related to the occurrence and development of aneurysm. At present, intracranial aneurysm treatment methods are mainly divided into surgical clipping and intravascular interventional treatment technologies, but the intracranial operation risk of patients suffering from aneurysm is extremely high, and the surgical clipping is not popular with doctors along with various complications and other factors. With the development of minimally invasive endovascular interventional therapy technology, more and more intracranial aneurysm patients select vascular interventional therapy, and the vascular interventional therapy technology is gradually becoming a main method for treating intracranial aneurysms.

The surgical goals of endovascular intervention are: utilize femoral artery puncture, place fine microcatheter in aneurysm bag or tumor neck position, send into aneurysm bag through microcatheter with soft titanium alloy spring coil in and fill it for blood flow disappears in the aneurysm bag, thereby eliminates the risk of breaking once more and bleeding. However, for the aneurysm at the bifurcation of the artery, if only the ordinary embolic stent is implanted, the aneurysm opening cannot be closed well, the spring ring is easy to leak from the aneurysm opening, and serious medical accidents are caused. Currently, for the method of implanting an aneurysm stent at a bifurcation, two stents are implanted into two main branches of a blood vessel respectively, so that the spring coil embolization treatment can be better performed, as shown in fig. 1, the method comprises three steps: first a first stent 5 is implanted, then a second stent 6 is implanted at the intersection, and finally a coil 7 is implanted through a microcatheter into an aneurysm 8 for embolization. The operation method is complex, has wide range of influence on blood vessels in the operation process, and is easy to cause thrombus and new embolism complication.

in summary, in order to solve the problem of the current vascular interventional therapy technology for the aneurysm at the intracranial bifurcation, it is urgently needed to develop a stent which is simple to use, high in efficiency and safe for the treatment of the aneurysm at the intracranial bifurcation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide an intracranial bifurcation aneurysm stent.

The purpose of the utility model can be realized through the following technical scheme:

An aneurysm stent at an intracranial bifurcation comprises a stent main body, a plugging part, a connecting rod and a developing point,

The stent main body is a self-expanding reticular structure,

The blocking part is in a flaring shape,

The bracket main body and the plugging part are connected by the connecting rod,

The developing points are distributed at the tail part of the near end of the stent main body and the far end of the plugging part.

The stent main body is a reticular structure formed by a sine curve, has better radial supporting force, and is better positioned in a release position in a blood vessel after the stent is released. The net structure of the stent main body is formed by cutting or weaving.

the flaring angle of the plugging part is 30-179 degrees to match with aneurysms of different shapes, and the bottom of the plugging part is provided with a round hole with the diameter of 1-3mm to be connected with a stent beam, so that a spring ring implanted in the aneurysm is prevented from leaking out, and the aim of sealing the aneurysm opening is better achieved.

The four connecting rods are arranged, so that the influence on the blood flow in blood vessels at two sides of the intracranial bifurcation when the stent is implanted is well avoided.

The developing point is of a hollow cylinder structure. The visualization point sees the state in the vessel after stent release by DSA technique.

the material of the stent main body is preferably medical super-elastic alloy material, including metal tantalum, medical stainless steel, nickel-titanium alloy and the like. The blocking part is formed by cutting, and the blocking part is made of medical super-elastic alloy materials including metal tantalum, medical stainless steel, nickel-titanium alloy and the like. The developing point material is preferably platinum, tantalum, tungsten and the like.

The utility model discloses a use: firstly releasing the stent, implanting the blocking part into an aneurysm cavity, enabling the microcatheter to pass through a round hole at the bottom of the blocking part or a gap around the round hole, enabling the pushing rod to pass through the microcatheter to release the spring ring, enabling the spring ring to fill the aneurysm cavity, and withdrawing the pushing rod and the microcatheter.

The utility model discloses a support uses with cooperation such as little seal wire, little pipe, push rod, is the prior art that technical staff in the field is known.

compared with the prior art, the utility model has the advantages of it is following:

(1) the main structure of the stent adopts a sinusoidal self-expanding structure, has better radial supporting force, can be better matched with the inner wall of a blood vessel, and can not slide in the blood vessel after the stent is completely released.

(2) The stent plugging part completely extends into an aneurysm cavity, and the far end is in a flaring shape and is matched with an aneurysm opening, so that a spring ring implanted into the aneurysm can be well prevented from leaking, and the aneurysm opening can be better plugged.

(3) the main body of the stent is connected with the plugging part by four rods without redundant structures, so that blood in blood vessels at two sides of the aneurysm at the bifurcation can flow normally.

(4) the bottom of the plugging part is provided with a round hole with the diameter of 1-3mm, and the round hole is connected with the bracket beam, so that the coil is conveniently conveyed by the microcatheter, and simultaneously, the aneurysm opening is better sealed.

(5) One or more developing points are respectively arranged at the tail part of the proximal end of the stent main body and the distal part of the plugging part, and after the stent is released, the state of the stent in a blood vessel after the stent is released can be well seen through DSA technology and the like.

Drawings

FIG. 1 is a prior art bifurcation aneurysm treatment technique;

FIG. 2 is a view of the bracket of the present invention before release;

FIG. 3 is a view showing the structure of the released stent of the present invention;

FIG. 4 is a schematic view of the aneurysm opening of the present invention closing the bifurcation after release;

figure 5 is a schematic view of a procedure for treating an aneurysm at a bifurcation using the present invention.

In the figure, 1-stent main body, 2-blocking part, 3-connecting rod, 4-developing point, 5-first stent, 6-second stent, 7-coil, 8-aneurysm, 9-microcatheter, 10-micro guide wire and 11-pushing rod.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

examples

The structure of the intracranial bifurcation aneurysm stent is shown in figures 2-3 and comprises a stent main body 1, a plugging part 2, a connecting rod 3 and a developing point 4. The stent main body 1 is a self-expanding net structure, the plugging part 2 is in a flaring shape, and the developing points 4 are cylinders made of platinum materials. The grid of the stent main body 1 adopts a sine curve, so that the stent has better radial supporting force, and is better positioned in the position of the released stent in a blood vessel after the stent is released. The stent main body 1 and the plugging part 2 are connected by four connecting rods 3, so that the influence on the blood flow in blood vessels at two sides of the intracranial bifurcation when the stent is implanted is well avoided. The flaring angle of the plugging part 2 is between 0 and 179 degrees to match aneurysms with different forms, as shown in figure 4, a round hole with the diameter of 1 to 3mm is arranged at the bottom of the plugging part 2 to be connected with a stent beam, so as to prevent a spring ring implanted in the aneurysm from leaking out, and further achieve the purpose of sealing the aneurysm opening.

The reticular structure of the stent main body 1 is formed by cutting or weaving, and the material of the reticular structure is preferably medical super-elastic alloy material, including metal tantalum, medical stainless steel, nickel-titanium alloy and the like. The plugging part 2 is formed by cutting, and the material of the plugging part is medical super-elastic alloy material, including metal tantalum, medical stainless steel, nickel-titanium alloy and the like. The material of the development sites 4 is preferably platinum, tantalum, tungsten, or the like. One or more visualization points are respectively arranged at the tail part of the proximal end of the stent main body and the distal part of the plugging part.

The utility model discloses use with cooperation such as little seal wire, pipe, push rod, spring coil a little, be the prior art that technical personnel in the field are known. In the case of the vascular stent-assisted embolization treatment of aneurysm, as shown in fig. 5, a microcatheter 9 is first guided through a microcatheter 10 into the lumen of the aneurysm, then the microcatheter 10 is withdrawn to deliver the stent through the microcatheter 9 to the portion shown in (1) in fig. 5, and the microcatheter 9 is slowly withdrawn and the stent is released as shown in (2) in fig. 5. The microcatheter 9 is again guided over the micro-wire 10 to the portion shown in fig. 5 (1). The micro-guidewire 10 is slowly withdrawn and the coil 7 is delivered into the aneurysm cavity at the bifurcation through the pushing rod 11 through the mesh hole at the bottom of the occlusion part 2, as shown in (3) of fig. 5. The coil is plugged into the lumen of the dense embolic aneurysm and the pusher rod 11 and microcatheter 9 are withdrawn to complete stent embolization, as shown in (4) of fig. 5.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims

1. An aneurysm stent at an intracranial bifurcation is characterized by comprising a stent main body, a plugging part, a connecting rod and a developing point,

The main body of the bracket is of a net structure,

The plugging part is in a flaring shape, the flaring angle of the plugging part is between 30 and 179 degrees, a round hole connected with the connecting rod is arranged at the bottom of the plugging part,

2. the intracranial bifurcation aneurysm stent of claim 1, wherein the stent body is a sinusoidal mesh structure.

3. The intracranial bifurcation aneurysm stent of claim 1 or 2, wherein the mesh structure of the stent body is cut or woven.

4. The intracranial bifurcation aneurysm stent of claim 1, wherein the connecting rods are four.

5. The intracranial bifurcation aneurysm stent of claim 1, wherein the visualization site is a hollow cylinder structure.