CN104758023B - A kind of blood flow turning rack - Google Patents

Abstract

The present invention provides a blood flow diverting bracket, comprising: a mesh hollow cylindrical support frame and a steering device arranged on the inner wall of the support frame; the steering device is uniformly distributed in the radial direction of the support frame, The support frame is composed of a plurality of turning pieces arranged in sequence in the axial direction. The present invention uses the diverting piece to change the direction of blood flow, weakens the blood flow in the aneurysm, and reduces the damage caused by the impact of blood flow on the aneurysm wall, thereby preventing the aneurysm from continuing to grow or rupture, and even completely degrading or disappearing the aneurysm . At the same time, the stent of the present invention is a hollow structure, and a turning plate is arranged therein, which can change the direction of blood flow, avoid covering membrane, allow blood flow to flow into side branch vessels, and avoid blockage of side branch vessels.

Description

A blood flow steering bracket

technical field

The invention relates to the field of medical instruments, in particular to a blood flow steering bracket.

Background technique

Aneurysm is a manifestation of localized or diffuse expansion or bulging of the arterial wall due to lesion or injury of the arterial wall, and the main manifestation is an expansive and pulsating mass. Aneurysm is a potentially life-threatening disease, which continues to grow under the impact of blood flow, compressing the surrounding trachea or tissue and causing symptoms, such as: aneurysm rupture due to increased blood pressure or other factors, will occur sharply bleeding. Aneurysms can occur anywhere in the arterial system, but trunk aneurysms, intracranial aneurysms, and carotid aneurysms are more common. Among them, the treatment of intracranial aneurysms is the most complicated.

Intracranial aneurysms are caused by localized congenital defects in the walls of cerebral arteries and increased intracranial pressure. When it ruptures, it manifests as meningeal irritation such as severe headache, irritability, nausea and vomiting, followed by increased intracranial pressure, which can be life-threatening in severe cases.

Endovascular treatment methods for intracranial aneurysms mainly include parent artery occlusion, balloon embolization in the aneurysm cavity, liquid embolization, coil embolization, and vascular tissue engineering techniques. The electrolytic decoil coil (GDC) embolization technique is the most widely used, by stuffing a coil in the aneurysm cavity, or filling the aneurysm cavity with the help of a balloon/stent, so that a thrombus is formed in the aneurysm cavity, and finally isolated from normal blood . After the treatment with the above methods, the huge intracranial aneurysm will produce a mass effect, or the aneurysm cavity will not be densely packed, making it difficult for these techniques to obtain ideal therapeutic effects.

Subsequently, the covered stent gradually became a new way to treat aneurysms. The existing covered stent includes a support structure and a membrane. The membrane covers the outside of the support structure. The blood flow of the tumor is isolated from the normal circulation, and the blood flow channel is re-established in the parent artery. However, this kind of covered stent may cause blockage of side branch vessels of the stent segment, or restenosis after stent implantation.

Contents of the invention

The technical problem to be solved by the present invention is to provide a blood flow steering stent, which can change the direction of blood flow, prevent the blood flow from impacting the inner cavity of the aneurysm, prevent the aneurysm from continuing to grow or rupture, and even completely degenerate or disappear the aneurysm. To achieve the purpose of curing intracranial aneurysms; at the same time, it can also avoid the blockage of collateral vessels.

The invention discloses a blood flow steering bracket, comprising:

A mesh-shaped hollow cylindrical support frame and a steering device arranged on the inner wall of the support frame;

The steering device is composed of a plurality of steering blades that are evenly distributed in the radial direction of the support frame and arranged in sequence along the axial direction of the support frame.

Preferably, it also includes: markings arranged at both ends of the steering device.

Preferably, it also includes markings arranged at both ends of the support frame.

Preferably, the length of the steering device is 5-16 mm.

Preferably, the surface of the turning plate and the inner wall surface of the support frame form an angle of 1-30°.

Preferably, the turning piece is connected to the support frame through a connection point, and the turning piece is rotated at an angle of 0-45° around the connection point between the turning piece and the support frame.

Preferably, the lengths of the support frames at both ends of the steering device are equal.

Preferably, the diameter of the support frame is 2-10mm.

Preferably, the diverting sheet is a thin sheet with smooth edges.

Preferably, the number of the turning vanes along the axial direction is 6-20 rows, and the number of turning vanes on the same circumference is 6-50.

Compared with the prior art, the blood flow steering bracket of the present invention includes: a mesh hollow cylindrical support frame and a steering device arranged on the inner wall of the support frame; It is composed of a plurality of turning blades that are evenly distributed upwards and arranged in sequence along the axial direction of the support frame. The present invention uses the diverting piece to change the direction of blood flow, weakens the blood flow in the aneurysm, and reduces the damage caused by the impact of blood flow on the aneurysm wall, thereby preventing the aneurysm from continuing to grow or rupture, and even completely degrading or disappearing the aneurysm . At the same time, the stent of the present invention is a hollow structure, and a turning plate is arranged therein, which can change the direction of blood flow, avoid covering membrane, allow blood flow to flow into side branch vessels, and avoid blockage of side branch vessels.

Description of drawings

Fig. 1 is a schematic diagram of the internal cross-sectional structure of the blood flow steering bracket of the present invention;

Fig. 2 is a schematic view of the side structure when the diverter blade of the present invention is at different torsion angles;

Fig. 3 is a schematic diagram of the blood flow diverting stent of the present invention being released in a blood vessel.

detailed description

In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

The embodiment of the present invention discloses a blood flow diversion stent, including:

A mesh-shaped hollow cylindrical support frame and a steering device arranged on the inner wall of the support frame;

The steering device is composed of a plurality of steering blades that are evenly distributed in the radial direction of the support frame and arranged in sequence along the axial direction of the support frame.

The blood flow steering bracket of the present invention includes a support frame and a steering device. The support frame is a mesh-shaped hollow cylinder with open ends, and is preferably a self-expanding metal support. The support frame is preferably made of memory metal, more preferably nickel-titanium alloy; the outer diameter of the support frame is preferably 1-5 mm, the wall thickness is preferably 0.1-0.25 mm, and the length is preferably 10-20 mm. In order that the stent can accurately act on the position of the aneurysm, it preferably also includes markings arranged at both ends of the stent. The indicator is preferably platinum wire, platinum alloy wire, gold wire or gold alloy wire with a diameter of 0.01-0.06 mm. The indicator can show the position of the bracket under X-ray, which is convenient for accurate positioning.

In the present invention, the steering device is composed of a plurality of steering blades that are evenly distributed in the radial direction of the support frame and arranged in sequence along the axial direction of the support frame. The steering device is arranged on the inner wall of the support frame, which can be arranged on any part of the inner wall of the support frame, can be close to the end of the support frame, or can be in the middle of the support frame; preferably the support frames at both ends of the steering device The lengths are equal, that is, the steering device is arranged at the middle part of the inner wall of the support frame. The length of the steering device is preferably 5-16 mm. In the blood vessel, the steering device needs to be accurately placed at the opening of the aneurysm. Therefore, the blood flow diverting stent of the present invention preferably further includes indicators arranged at both ends of the steering device. The indicator is preferably platinum wire, platinum alloy wire, gold wire or gold alloy wire with a diameter of 0.01-0.06 mm. The indicator can display the position of the steering device under X-ray, which is convenient for accurate positioning.

The diverter vane is preferably a thin sheet with smooth edges. There is no special limitation on the shape of the diverter vane, which can be circular, oval or scale-shaped. The preferred width of the diverter vane is 0.1-3mm, and the length is 1-3 mm. 5mm, thickness 0.1 ~ 0.25mm. The turning piece is connected to the support frame through a connection point. Preferably, the surface of the turning piece and the inner wall surface of the support frame form an angle of 1-30°. Further preferably, the turning piece rotates at an angle of 0-45° around its connection point with the support frame. The number of the diverting vanes along the axial direction is preferably 6-20 rows, and the number of diverting vanes on the same circumference is preferably 6-50. The invention changes the direction of the blood flow through the function of the turning plate, weakens the blood flow in the tumor, reduces the damage to the tumor wall caused by the impact of the blood flow, and rapidly forms a thrombus in the tumor.

Since the blood flow steering stent of the present invention has a hollow structure as a whole, when there are side branch vessels, the blood flow can still smoothly and slowly flow into the side branch vessels, avoiding the situation that the side branch vessels are blocked.

Fig. 1 is a schematic diagram of the internal cross-sectional structure of the blood flow diverting stent of the present invention. In Fig. 1, (1) is the support frame mark, (2) is the steering device mark, (3) is the steering device, and (4) is the support frame.

Fig. 2 is a schematic view of the side structure of the diverter blade of the present invention when it is twisted at different angles. In Fig. 2, the steering piece (3) protrudes from the surface of the support frame and rotates at an angle. 2a is a schematic diagram of the side structure when the surface of the steering plate and the inner wall surface of the support frame form an angle of 1 to 30°; Schematic diagram of the side structure when the connection point of the frame is rotated from the center to an angle greater than 0° and less than or equal to 45°.

Fig. 3 is a schematic diagram of the blood flow diverting stent of the present invention being released in a blood vessel. In Fig. 3, the blood flow steering stent (8) is released in the blood vessel (5), and the steering device (3) spans the neck of the aneurysm. When the blood (7) flows through the aneurysm (6), the steering device (3) The steering piece has a blocking function, the original flow direction of the blood flow is changed, and it cannot be directly filled into the aneurysm cavity, preventing the aneurysm from continuing to grow or rupture. Moreover, since the blood flow steering stent of the present invention adopts a hollow structure, when there are side branches (9) at the place where the stent is placed, the blood flow can still smoothly and slowly flow into the side branch vessels, avoiding the side branches (9) from being blocked.

The preparation method of the blood flow steering bracket of the present invention is as follows:

Use laser cutting memory alloy tube or weaving memory alloy wire to get a mesh hollow cylindrical support frame;

A diverting piece made of memory alloy material is assembled on the support frame to obtain a blood flow diverting bracket.

The descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A blood flow steering bracket, comprising: A mesh-shaped hollow cylindrical support frame and a steering device arranged on the inner wall of the support frame; The steering device is composed of a plurality of steering blades that are evenly distributed in the radial direction of the support frame and arranged in sequence along the axial direction of the support frame; The surface of the steering plate and the inner wall surface of the support frame form an angle of 1-30°. 2 . The blood flow diverting stent according to claim 1 , further comprising: indicator marks arranged at both ends of the diverting device. 3 . 3 . The blood flow diverting stent according to claim 2 , further comprising indicator marks arranged at both ends of the stent. 4 . 4. The blood flow diverting stent according to any one of claims 1-3, wherein the length of the diverting device is 5-16 mm. 5. The blood flow diverting bracket according to claim 1, characterized in that, the diverting piece is connected to the support frame through a connection point, and the turning piece rotates around the connection point between the turning piece and the support frame 0~45° included angle. 6. The blood flow diverting bracket according to any one of claims 1-3, characterized in that the lengths of the supporting frames at both ends of the diverting device are equal. 7. The blood flow diverting stent according to any one of claims 1-3, wherein the diameter of the support frame is 2-10 mm. 8. The blood flow diverting stent according to any one of claims 1-3, wherein the diverting piece is a thin sheet with smooth edges. 9. The blood flow diverting bracket according to any one of claims 1-3, characterized in that, the number of said diverting pieces along the axial direction is 6-20 rows, and the number of turning pieces on the same circumference is 6-50 .