Thrombectomy stent with balloon dilatation
By designing a balloon-expandable thrombus removal stent and utilizing the hollow area and mesh structure to capture thrombi, the problem that existing stents have difficulty capturing large thrombi is solved, achieving efficient thrombus removal and reducing the risk of escape.
Patent Information
- Application Number
- CN202511123966.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-12
- Publication Date
- 2025-10-10
AI Technical Summary
Existing mechanical thrombectomy stents are difficult to effectively capture hard and large thrombi, and there is a risk of thrombus escape, resulting in low thrombus removal efficiency.
A balloon-expandable thrombectomy stent is designed, which includes a thrombectomy stent, a catheter and a balloon. The stent is provided with multiple hollow areas and mesh structures inside. The hollow areas are used to capture thrombi, the balloon is used to block blood flow to reduce resistance, and the mesh captures escaped thrombus fragments.
It improves the ability to capture harder and larger thrombi, reduces the risk of thrombus escape, and improves the efficiency of thrombus removal.
Smart Images
Figure CN120753742A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a thrombectomy stent with balloon expansion. Background Art
[0002] Ischemic stroke is brain tissue damage caused by local ischemia and hypoxia due to blockage of cerebral blood vessels. According to statistics from the World Health Organization (WHO), the annual incidence of stroke worldwide is 246 to 322 per 100,000 people, of which ischemic stroke accounts for approximately 70% to 80%. This means that there are approximately 15 million to 20 million new cases of stroke each year, most of which are ischemic stroke. Mechanical thrombectomy is an important treatment for ischemic stroke, but the mechanical thrombectomy stents currently on the market have difficulty capturing harder and larger clots and face the risk of clot escape, resulting in low thrombectomy efficiency. Summary of the Invention
[0003] The object of the present invention is to provide a thrombus removal stent with balloon expansion to solve the problems raised in the above background technology.
[0004] To achieve the above object, the present invention provides the following technical solutions:
[0005] A thrombectomy stent with balloon expansion comprises a thrombectomy stent, a catheter is provided on one side of the thrombectomy stent, a balloon is connected to the outer side of the catheter, a guide wire is provided in the catheter, one end of the guide wire passes through the catheter, and the other end of the guide wire passes through the catheter and is connected to the thrombectomy stent, the thrombectomy stent comprises a proximal part, a middle first section, a middle second section and a tail end, the middle first section is provided at an end of the proximal part away from the catheter, the middle second section is provided at an end of the middle first section away from the proximal part, and the tail end is provided at an end of the middle second section away from the middle first section, the proximal part, the middle first section, the middle second section and the tail end are connected by a metal braided wire, a first section hollow area is set between the proximal part and the middle first section, a second section hollow area is set between the middle first section and the middle second section, and a third section hollow area is set between the middle second section and the tail end.
[0006] Preferably, the middle of the proximal part is connected by multiple elliptical meshes in parallel, and the two ends are connected by semi-elliptical meshes, and the semi-elliptical meshes at both ends are symmetrical about the middle axis of the stent. The proximal part and the first middle section are connected by a metal braided wire on each side of the middle of the proximal part, and the guide wire is connected to one of the metal braided wires to ensure that the proximal part can collect the thrombus.
[0007] Preferably, the first column of the first middle section is composed of an odd number of "V"-shaped braided wires, and the "V"-shaped braided wires are wrapped around the axis of the stent. The opening of the "V"-shaped braided wire faces the proximal part of the stent. The end of the first middle column of "V"-shaped braided wires is connected to the opening of the second "V"-shaped column, and the end of the second "V"-shaped column is connected to the second middle section to facilitate the entry of thrombus.
[0008] Preferably, the middle of the second middle section consists of an elliptical mesh, with a half semi-elliptical mesh at each end. The ends of the semi-elliptical mesh at both ends are closed and connected to the ends of the middle elliptical mesh and a metal braided wire is led out to ensure that the second middle section can collect the thrombus.
[0009] Preferably, both sides of the middle second section are directly connected to the tail end bracket, the tail end bracket part is composed of multiple parallel elliptical meshes, and the connected ellipses are cross-penetrated, the elliptical meshes at the distal end of the tail end bracket gradually narrow and converge at one point, and the elliptical meshes of the tail end bracket are smaller than the meshes of the proximal part, the middle first section, and the middle second section, and are used to capture fragments of broken thrombus.
[0010] Preferably, metal braided wires are led out from the ends of both ends of the proximal part and the proximal end of the tail end, and the head ends of the metal braided wires, except for the middle "V" shape connected to the proximal part stent, the other "V"-shaped braided wire head ends and the ends of the metal braided wires are provided with circular marks. The circular marks are used for development during surgical operations to indicate the contact status of each part of the stent with the thrombus.
[0011] Compared with the prior art, the beneficial effects of the present invention are: when the present invention is in use, the thrombus removal stent is provided with multiple hollow areas to capture harder and larger thrombi, allowing the thrombi to enter the interior of the thrombus removal stent and then be dragged out; the thrombus removal stent is provided with a tail end portion with a denser mesh to capture escaped emboli. This thrombus removal stent with a balloon can capture harder and larger thrombi, reduce the risk of thrombus escape, and improve the efficiency of thrombus removal. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the overall structure of a thrombectomy stent with balloon expansion.
[0013] Figure 2 Schematic diagram of a thrombectomy stent with a balloon-expandable thrombectomy stent.
[0014] Figure 3 Schematic diagram of a catheter with a balloon-expandable thrombectomy stent.
[0015] Figure 4 This is a schematic cross-sectional view of a catheter with a balloon-expandable thrombectomy stent.
[0016] In the figure: 1, thrombus extraction stent; 2, catheter; 3, balloon; 4, guide wire; 5, proximal end part; 6, first middle section; 7, second middle section; 8, tail end; 9, first section empty area; 10, second section empty area; 11, third section empty area; 12, circular mark. DETAILED DESCRIPTION
[0017] Example 1
[0018] Referring to Figures 1-4 the figure, a thrombus extraction stent with balloon expansion includes a thrombus extraction stent 1, one side of which is provided with a catheter 2, the outer side of which is provided with a balloon 3 connected outside, the catheter 2 is provided with a guide wire 4, one end of the guide wire 4 penetrates the catheter 2, the other end of the guide wire 4 penetrates the catheter 2 and is connected with the thrombus extraction stent 1, the thrombus extraction stent 1 includes a proximal end part 5, a first middle section 6, a second middle section 7 and a tail end 8, the first middle section 6 is arranged at one end of the proximal end part 5 away from the catheter 2, the second middle section 7 is arranged at one end of the first middle section 6 away from the proximal end part 5, the tail end 8 is arranged at one end of the second middle section 7 away from the first middle section 6, the proximal end part 5, the first middle section 6, the second middle section 7 and the tail end 8 are connected by metal woven wires, the proximal end part 5 and the first middle section 6 are arranged as a first section empty area 9, the first middle section 6 and the second middle section 7 are arranged as a second section empty area 10, and the second middle section 7 and the tail end 8 are arranged as a third section empty area 11.
[0019] Referring to Figure 1 and Figure 2 the figure, the middle of the proximal end part 5 is connected by a plurality of oval mesh holes side by side, the two ends are connected by half-oval mesh holes and the two half-oval mesh holes are symmetrical about the middle axis of the stent, the proximal end part 5 and the first middle section 6 are connected by one metal woven wire on each side of the middle of the proximal end part 5, the guide wire 4 is connected with one of the metal woven wires, and the proximal end part 5 is guaranteed to collect thrombus.
[0020] Referring to Figure 1 and Figure 2 the figure, the first column of the first middle section 6 is connected by an odd number of "V" type woven wires, and the "V" type woven wires are wound around the stent axis for one turn, the opening of the "V" type woven wire faces the proximal end part 5 stent, the end of the first column of "V" type woven wire in the middle is connected with the opening of the second column of "V" type woven wire, and the end of the second column of "V" type woven wire is connected with the second middle section 7, so as to facilitate the entry of thrombus.
[0021] Referring to Figure 1 and Figure 2As shown, the middle of the second middle section 7 is composed of an elliptical mesh, with a half semi-elliptical mesh at each end. The ends of the semi-elliptical mesh at both ends are respectively closed and connected to the ends of the middle elliptical mesh and a metal braided wire is led out to ensure that the second middle section 7 can collect the thrombus.
[0022] refer to Figure 1 and Figure 2 As shown, the two sides of the middle second section 7 are directly connected to the bracket of the tail end 8. The bracket part of the tail end 8 is composed of multiple parallel elliptical meshes, and the connected ellipses are cross-penetrated. The elliptical meshes at the distal end of the tail end 8 bracket gradually narrow and converge at one point. The elliptical meshes of the tail end 8 bracket are smaller than the meshes of the proximal part 5, the middle first section 6, and the middle second section 7, and are used to capture fragments of broken thrombus.
[0023] refer to Figure 1 and Figure 2 As shown, metal braided wires are led out from the ends of both ends of the proximal part 5 and the proximal end of the tail end 8, and the head ends of the metal braided wires, except for the middle "V" shape connected to the proximal part stent, the other "V"-shaped braided wire head ends and the ends of the metal braided wires are provided with circular marks 12. The circular marks 12 are used for development during surgical operations to indicate the contact status of each part of the stent with the thrombus.
[0024] Working principle: The guidewire 4 is inserted into the interior of the catheter 2 and slides, and the thrombectomy stent 1 is extended into the patient's blood vessel. The guidewire 4 is welded to the proximal end of the thrombectomy stent 1, and a part of the guidewire 4 is reserved at the distal end to guide the thrombectomy stent 1 into the blood vessel. The elliptical mesh of the tail end 8 is smaller than the mesh of the proximal part 5, the middle first section 6, and the middle second section 7, which is used to capture fragments of broken thrombi. The setting of the first section hollow area 9, the second section hollow area 10, and the third section hollow area 11 can allow harder thrombi to enter the interior of the stent, and then the thrombi can be dragged out by dragging the stent. The hollow areas of different lengths can allow thrombi of different sizes. The direction of the third section hollow area 11 is perpendicular to the direction of the hollow areas of the first and second sections. There is a lumen for the thrombectomy stent 1 to enter and exit the catheter 2. When the thrombectomy stent 1 captures the thrombus, the balloon 3 is inflated to block the blood flow to the thrombus and reduce the resistance to thrombus removal.
[0025] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.
Claims
1. A thrombectomy stent with balloon expansion, comprising a thrombectomy stent (1), characterized in that: A catheter (2) is provided on one side of the thrombus removal bracket (1), and a balloon (3) is sleeved and connected to the outer side of the catheter (2). A guide wire (4) is provided in the catheter (2), and one end of the guide wire (4) passes through the catheter (2), and the other end of the guide wire (4) passes through the catheter (2) and is connected to the thrombus removal bracket (1). The thrombus removal bracket (1) includes a proximal portion (5), a first middle section (6), a second middle section (7) and a tail end (8). The first middle section (6) is provided at one end of the proximal portion (5) away from the catheter (2), and the second middle section (7) is provided at the middle The first section (6) is located at one end away from the proximal section (5), and the tail end (8) is located at one end of the middle second section (7) away from the middle first section (6). The proximal section (5), the middle first section (6), the middle second section (7) and the tail end (8) are connected by metal braided wires. A first section hollow area (9) is defined between the proximal section (5) and the middle first section (6), a second section hollow area (10) is defined between the middle first section (6) and the middle second section (7), and a third section hollow area (11) is defined between the middle second section (7) and the tail end (8).
2. The balloon-expandable thrombectomy stent according to claim 1, characterized in that: The middle of the proximal part (5) is connected by a plurality of elliptical meshes in parallel, and the two ends are connected by semi-elliptical meshes, and the semi-elliptical meshes at both ends are symmetrical about the middle axis of the stent. The proximal part (5) and the middle first section (6) are connected by a metal braided wire on each side of the middle of the proximal part (5), and the guide wire (4) is connected to one of the metal braided wires.
3. The balloon-expandable thrombectomy stent according to claim 1, characterized in that: The first column of the middle first section (6) is composed of an odd number of "V"-shaped braided wires, and the "V"-shaped braided wires are wound around the axis of the stent once, and the opening of the "V"-shaped braided wires faces the proximal part (5) of the stent. The end of the middle first column of "V"-shaped braided wires is connected to the opening of the second column of "V", and the end of the second column of "V" is connected to the middle second section (7).
4. The balloon-expandable thrombectomy stent according to claim 1, characterized in that: The middle of the second middle section (7) is composed of an elliptical mesh, and two half semi-elliptical meshes at each end. The ends of the semi-elliptical meshes at both ends are respectively closed and connected with the ends of the middle elliptical mesh and lead out a metal braided wire.
5. The balloon-expandable thrombectomy stent according to claim 1, characterized in that: The two sides of the middle second section (7) are directly connected to the bracket of the tail end (8). The bracket part of the tail end (8) is composed of multiple parallel elliptical meshes, and the connected ellipses are cross-penetrated. The elliptical meshes at the distal end of the tail end (8) bracket gradually narrow and converge at one point.
6. The balloon-expandable thrombectomy stent according to claim 1, characterized in that: Metal braided wires are led out from the ends of both ends of the proximal part (5) and the proximal end of the tail end (8), and the head ends of the metal braided wires, except for the middle "V" shape connected to the proximal part bracket, the other "V"-shaped braided wire head ends and the metal braided wire ends are all provided with circular marks (12).
7. The method for operating a balloon-expandable thrombectomy stent according to claim 1, characterized in that: The guide wire (4) is inserted into the catheter (2) and slides to extend the thrombus removal stent (1) into the patient's blood vessel, wherein the guide wire (4) is welded to the proximal end of the thrombus removal stent (1), and a portion of the guide wire (4) is reserved at the distal end to guide the thrombus removal stent (1) into the blood vessel. The elliptical mesh of the tail end (8) stent is smaller than the mesh of the proximal part (5), the first middle section (6), and the second middle section (7), and is used to capture fragments of broken thrombi. The first section hollow area (9), the second section hollow area (10), The setting of the third hollow area (11) can allow harder thrombi to enter the interior of the stent, and then the thrombi can be taken out by dragging the stent. Hollow areas of different lengths can allow thrombi of different sizes. The direction of the third hollow area (11) is perpendicular to the direction of the first hollow area (9) and the second hollow area (10). There is a cavity for the thrombus removal stent (1) to enter and exit the catheter (2). When the thrombus removal stent (1) captures the thrombus, the balloon (3) is inflated to block the blood flow to the thrombus and reduce the resistance to thrombus removal.