A vascular stent

Abstract

The utility model provides a kind of vascular stent, the device includes: first support, first support includes first support unit and first pipe body, first support unit is set on first pipe body, along the length direction of first pipe body extends, and stop and resist the outside wall of first pipe body, first pipe body is distributed with multiple first hollow holes of interval distribution;Second support, second support includes second support unit and second pipe body, second support unit is set on second pipe body, along the length direction of second pipe body extends, and stop and resist the outside wall of second pipe body, second pipe body is distributed with multiple second hollow holes of interval distribution;The end of second support is connected with first support, the lumen of first pipe body is communicated with the lumen of second pipe body.In the utility model, sufficient radial support force is provided while excellent flexibility is guaranteed, the mechanical stress stimulation to blood vessel intima is small, and the long-term patency of main branch and side branch is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of implantable vascular technology, and more particularly to a vascular stent. Background Technology

[0002] Carotid artery stenosis is one of the leading causes of ischemic stroke. Currently, the main surgical procedure for treating carotid artery stenosis is carotid artery stenting (CAS). However, CAS carries a short-term risk of plaque detachment leading to perioperative stroke, and a high long-term rate of in-stent restenosis. Plaque detachment and in-stent restenosis increase the risk of recurrent stroke, endangering patients' lives. Furthermore, secondary surgical intervention increases the financial burden on patients.

[0003] Based on the physiological and anatomical characteristics and pathogenesis of the carotid artery, plaque detachment and restenosis primarily occur at the bifurcation opening. Traditional metallic stents have large mesh sizes, making them ineffective at preventing plaque detachment. Furthermore, traditional carotid stents cannot cover stenotic lesions in the bifurcation collaterals, requiring the overlapping implantation of two stents at the bifurcation point. This overlap results in poor stent apposition, easily leading to increased local blood flow shear stress, creating a prothrombotic environment, and inducing intimal hyperplasia, ultimately causing restenosis. Finally, because the carotid artery is located in the neck, a region of constant motion, it undergoes various deformations such as tension, compression, bending, and torsion with movements like tilting the head forward, backward, and turning the head left and right. These complex mechanical actions place extremely high demands on stent compliance. Current metallic carotid stents cannot meet the simultaneous effects of multiple stresses, easily leading to stress concentration and damage to the vascular intima, inducing inflammation and restenosis. Therefore, there is an urgent clinical need for a stent that can prevent perioperative plaque detachment and reduce long-term restenosis rates. Utility Model Content

[0004] This invention provides a vascular stent to address the problem that existing stents cannot meet the simultaneous action of multiple stresses, and are prone to damage to the vascular intima due to stress concentration, inducing inflammation and restenosis.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] In a first aspect, embodiments of the present invention provide a vascular stent, comprising:

[0007] The first support includes a first support unit and a first tube. The first support unit is disposed on the first tube, extends along the length of the first tube, and abuts against the outer side wall of the first tube. The first tube has a plurality of spaced first perforated holes.

[0008] The second support includes a second support unit and a second tube. The second support unit is disposed on the second tube, extends along the length of the second tube, and abuts against the outer wall of the second tube. The second tube has a plurality of spaced second perforated holes.

[0009] One end of the second bracket is connected to the first bracket, and the lumen of the first tube body is in communication with the lumen of the second tube body.

[0010] Optionally, the first support unit includes a plurality of first annular structures spaced apart along the length direction of the first tube;

[0011] And / or,

[0012] The second support unit includes a plurality of second annular structures spaced apart along the length of the second tube.

[0013] Optionally, adjacent first annular structures are connected by the first tube body;

[0014] And / or,

[0015] Adjacent second annular structures are connected by the second tube.

[0016] Optionally, the first annular structure is wavy and extends circumferentially along the first tube body;

[0017] And / or,

[0018] The second annular structure is wavy and extends circumferentially along the second tube.

[0019] Optionally, the first support unit is connected to the second support unit, and the side wall of the first tube has a connection port, the edge of which is connected to the edge of the opening at one end of the second tube.

[0020] Optionally, the first tube has a first region and a second region, the first region is disposed between the second region, the connection port is disposed in the first region, and the distribution density of the first perforated hole in the first region is greater than the distribution density of the first perforated hole in the second region.

[0021] Optionally, the distribution density of the second perforation in the second tube is greater than the distribution density of the first perforation in the second region.

[0022] Optionally, the materials of the first support unit and the second support unit are selected from at least one of nickel-titanium alloy, cobalt-chromium alloy, stainless steel alloy, polylactic acid, magnesium alloy, and iron-aluminum alloy.

[0023] And / or,

[0024] The materials of the first tube and the second tube are selected from at least one of polytetrafluoroethylene, polyethylene, and polylactic acid.

[0025] Optionally, the first support unit is bonded to the outer wall of the first tube with adhesive, and the second support unit is bonded to the outer wall of the second tube with adhesive.

[0026] Optionally, the angle between the lumen of the first tube and the lumen of the second tube at the point of communication is less than 90 degrees;

[0027] And / or,

[0028] The diameter of the first pipe is larger than the diameter of the second pipe.

[0029] In this invention, by setting multiple spaced perforations on the first and second stents, the stent's ability to block plaques is enhanced, reducing the possibility of plaque detachment and thus lowering the risk of perioperative stroke. Patient safety is also enhanced by more effectively maintaining blood flow stability. Furthermore, the design of the first and second support units better adapts to different deformations caused by carotid artery movement, such as tension, compression, bending, and torsion, reducing the risk of intimal damage caused by stress concentration, thereby alleviating intimal inflammation and reducing restenosis. The connection design between the first and second stents allows for treatment through an integrated stent system when intervening in multiple lesion sites, optimizing the convenience of surgical procedures. The direct connection between the lumens of the two stents effectively covers stenotic lesions of bifurcation collaterals without requiring multiple stent overlap implantations, reducing surgical time and complexity. This solves the problem that existing stents cannot meet the simultaneous effects of multiple stresses, easily causing intimal damage due to stress concentration, and inducing inflammation and restenosis. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of a vascular stent provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the first stent structure of a vascular stent provided in an embodiment of the present invention;

[0033] Figure 3This is a schematic diagram of a second stent structure of a vascular stent provided in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the vascular structure of a vascular stent provided in an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the application structure of a vascular stent provided in an embodiment of this utility model;

[0036] Figure 6 This is a schematic diagram of the annular structure of a vascular stent provided in an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the first tube structure of a vascular stent provided in an embodiment of the present invention. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0039] Please refer to Figure 1 This utility model embodiment provides a vascular stent 100, comprising:

[0040] The first support 1 includes a first support unit 11 and a first tube 12. The first support unit 11 is disposed on the first tube 12, extends along the length direction of the first tube 12, and abuts against the outer side wall of the first tube 12. The first tube 12 has a plurality of spaced first hollow holes 13.

[0041] The second support 2 includes a second support unit 21 and a second tube 22. The second support unit 21 is disposed on the second tube 22, extends along the length of the second tube 22, and abuts against the outer side wall of the second tube 22. The second tube 22 has a plurality of spaced second hollow holes 23.

[0042] One end of the second support 2 is connected to the first support 1, and the lumen of the first tube 12 is connected to the lumen of the second tube 22.

[0043] In this embodiment of the present invention, for the first bracket 1 as follows: Figure 2As shown, this is the main branch of the vascular stent. By setting the first support unit 11 on the first tube 12 and extending it along the length direction, the mechanical strength and support capacity of the stent can be effectively increased, allowing the first stent 1 to maintain a stable shape under different stresses and preventing restenosis. The multiple spaced first perforations 13 distributed on the first tube 12 can optimize the blood flow path, avoid thrombus formation, improve blood flow sludge, and reduce blood stagnation inside and outside the stent. Furthermore, the setting of the first perforations 13 can also form a certain blocking effect, effectively capturing and blocking potential plaque detachment, reducing the risk of postoperative stroke, and helping to ensure patient safety. In addition, the coupling design of the first tube 12 and the first support unit 11 improves the overall integrity of the stent, facilitates operation and implantation in clinical surgery, can more effectively control the position and status of the stent, reduce the difficulty and time of operation, and improve the accuracy of implantation.

[0044] For the second support 2, as shown Figure 3 As shown, this is the side branch of the vascular stent. By setting the second support unit 21 on the second tube 22 and extending it along the length direction, the mechanical strength and support capacity of the stent can be effectively increased, allowing the second stent 2 to maintain a stable shape under different stresses and preventing restenosis. The multiple spaced second perforations 23 distributed on the second tube 22 can optimize the blood flow path, avoid thrombus formation, improve blood flow patency, and reduce blood stagnation inside and outside the stent. Furthermore, the setting of the second perforations 23 can also form a certain blocking effect, effectively capturing and blocking potential plaque detachment, reducing the risk of postoperative stroke, and helping to ensure patient safety. In addition, the coupling design of the second tube 22 and the second support unit 21 improves the overall integrity of the stent, facilitates operation and implantation in clinical surgery, can more effectively control the position and status of the stent, reduce the difficulty and time of operation, and improve the accuracy of implantation.

[0045] The connection between the first support 1 and the second support 2 forms a continuous support system, enabling the two supports to work together to achieve the following: Figure 4 The lesion site of the carotid artery shown is thus achieved as follows: Figure 5The effect shown is as follows: Specifically, the first stent 1 and the second stent 2 are connected by sutures. This "main-side integrated" design can better address complex arterial lesions, providing more comprehensive support and treatment. A single stent can cover stenosis of the main supply artery and collateral lesions, avoiding poor wall apposition at overlapping implantation sites, increased shear force leading to thrombosis, and restenosis. Furthermore, the lumen communication between the first tube body 12 and the second tube body 22 ensures unobstructed blood flow between the two stents. The continuous lumen design reduces blood flow resistance, optimizes hemodynamic performance, promotes stable blood flow, and thus reduces thrombus formation. Risks: The two stents, when connected, form a more robust structure, which helps improve the overall mechanical strength and can better resist intravascular pressure and stress from surrounding tissues in practical applications, thereby reducing the risk of restenosis. Furthermore, the connection design of the two stents simplifies the surgical procedure, allowing physicians to quickly and effectively place the stents accurately into the target location during implantation, reducing surgical time and risks, and improving the convenience of clinical operation. The connected stent system can better adapt to the motion characteristics of the carotid artery, adapt to the stretching and torsion during movement, reduce stress concentration caused by movement, and help maintain the stability and effectiveness of the stent in the body.

[0046] In this embodiment of the invention, by setting multiple spaced perforations on the first and second stents, the stent's ability to block plaques is enhanced, reducing the possibility of plaque detachment and thus lowering the risk of perioperative stroke. Patient safety is enhanced by more effectively maintaining blood flow stability. Furthermore, the design of the first and second support units better adapts to different deformations caused by carotid artery movement, such as tension, compression, bending, and torsion, reducing the risk of intimal damage caused by stress concentration, thereby alleviating intimal inflammation and reducing restenosis. The connection design between the first and second stents allows for treatment through an integrated stent system when intervening in multiple lesion sites, optimizing the convenience of surgical procedures. The direct connection between the lumens of the two stents effectively covers stenotic lesions of bifurcation collaterals without requiring multiple stent overlap implantations, reducing surgical time and complexity. This solves the problem that existing stents cannot meet the simultaneous effects of multiple stresses, easily causing intimal damage due to stress concentration, and inducing inflammation and restenosis.

[0047] Please refer to Figure 6 In this embodiment of the present invention, optionally, the first support unit 11 includes a plurality of first annular structures 111 spaced apart along the length direction of the first tube 12;

[0048] And / or,

[0049] The second support unit 21 includes a plurality of second annular structures 222 spaced apart along the length of the second tube 22.

[0050] Specifically, adjacent first annular structures are connected by a first tube;

[0051] And / or,

[0052] Adjacent second ring structures are connected by a second tube.

[0053] In this embodiment of the invention, the first annular structure 111 and the second annular structure 222 provide uniform support, enabling the first stent 1 and the second stent 2 to more effectively resist the impact of external pressure and internal blood flow within the blood vessel, enhancing the overall stability of the stent. The distributed support structure effectively prevents stent displacement within the blood vessel, ensuring implantation effectiveness. Furthermore, by setting multiple spaced annular structures, the support unit better adapts to the dynamic changes of the carotid artery, thus maintaining good overall flexibility during movement, adapting to the bending, twisting, and stretching of the carotid artery, reducing stress concentration and potential intimal damage. The annular structure design... The gaps and shape also help optimize blood flow paths, reduce flow resistance, and facilitate smooth blood flow within the stent. The symmetrical distribution between adjacent annular structures helps reduce local turbulence, lowers the risk of thrombosis, and effectively disperses the shear force and pressure of blood flow, reducing damage to the intima in local areas, thereby reducing the risk of restenosis. While promoting intimal healing, it effectively reduces the probability of postoperative complications. Furthermore, the connection between adjacent annular structures via the tubular body enhances the integrity and stability of the stent, effectively preventing loosening or displacement of the annular structures under mechanical action, ensuring the reliability and stability of the stent during use.

[0054] In this embodiment of the present invention, optionally, the first annular structure 111 is wavy and extends circumferentially along the first tube body 12.

[0055] And / or,

[0056] The second annular structure 222 is wavy and extends circumferentially along the second tube 22.

[0057] In this embodiment of the invention, the wavy annular structure has good flexibility and adaptability, which can effectively cope with dynamic changes in the blood vessel, allowing the stent to deform better when subjected to blood flow pressure and external forces, maintaining the stability of the stent and reducing the risk of intimal damage caused by movement; in addition, the wavy annular structure not only provides support, but also guides blood to flow more smoothly, reducing the risk of thrombosis and optimizing overall hemodynamics; by uniformly dispersing the shear force of blood and intravascular pressure, it reduces local stress concentration, further reducing the risk of restenosis or vascular injury.

[0058] Please refer to Figure 1 and Figure 2 In this embodiment of the present invention, optionally, the first support unit 11 is connected to the second support unit 21, the side wall of the first tube 12 has a connection port, and the edge of the connection port is connected to the edge of the tube opening at one end of the second tube 22.

[0059] In this embodiment of the invention, the effective connection between the first support unit and the second support unit via the connection port not only enhances the stability and adaptability of the stent system, but also optimizes the hemodynamic performance and improves the convenience of treatment operations.

[0060] Please refer to Figure 7 In this embodiment of the present invention, optionally, the first tube 12 has a first region 121 and a second region 122, the first region 121 is disposed between the second region 122, the connection port is disposed in the first region 121, and the distribution density of the first hollow hole 13 in the first region 121 is greater than the distribution density of the first hollow hole 13 in the second region.

[0061] In this embodiment of the present invention, optionally, the distribution density of the second perforated hole 23 of the second tube body 22 is greater than the distribution density of the first perforated hole 13 of the second region 122.

[0062] In this embodiment of the invention, the perforation density of the first region 121 is greater than that of the second region 122. This design helps to optimize blood flow. The high perforation density of the first region 121 can better adapt to complex blood flow and pressure conditions, providing corresponding support and stability, while the low density region can enhance local flexibility. By setting different perforation densities in different regions, the mechanical properties of the stent can be further optimized.

[0063] Specifically, the tube is first processed into a complete tube body by electrospinning, and then processed into a hollow hole structure by femtosecond laser cutting.

[0064] In this embodiment of the present invention, optionally, the materials of the first support unit 11 and the second support unit 21 are selected from at least one of nickel-titanium alloy, cobalt-chromium alloy, stainless steel alloy, polylactic acid, magnesium alloy, and iron-aluminum alloy.

[0065] And / or,

[0066] The materials of the first tube 12 and the second tube 22 are selected from at least one of polytetrafluoroethylene, polyethylene, and polylactic acid.

[0067] In this embodiment of the invention, materials such as nickel-titanium alloy, cobalt-chromium alloy, stainless steel alloy, polylactic acid, magnesium alloy, or iron-aluminum alloy are selected as the materials for the support unit. This ensures that the stent possesses excellent mechanical strength and flexibility. Specifically, nickel-titanium alloy has excellent elasticity and shape memory properties, enabling it to maintain good support in complex mechanical environments and adapt to the dynamic changes of the carotid artery. Using biodegradable materials such as polylactic acid for the support unit helps improve biocompatibility and reduce stimulation and rejection reactions to surrounding biological tissues. Using materials such as stainless steel alloy, which have high corrosion resistance and mechanical strength, improves the durability of the stent, ensuring that the stent can still maintain good performance under long-term load and corrosive environments, reducing the need for replacement surgery.

[0068] Polytetrafluoroethylene (PTFE), polyethylene (PE), and polylactic acid (PLA) are used as the tube material. These materials have smooth surfaces, which helps reduce blood flow resistance and provide good hydrodynamic performance. In addition, polymers such as PLA and PE have good flexibility, which can improve the compliance of the stent. During carotid artery movement, this material can effectively adapt to stretching and torsion in different directions, reducing the risk of structural damage. Furthermore, the use of biodegradable materials such as PLA helps the stent to gradually degrade after treatment, reducing the long-term impact of implantation on the patient's body.

[0069] In this embodiment of the present invention, optionally, the first support unit 11 is connected to the outer wall of the first tube 12 with adhesive, and the second support unit 21 is connected to the outer wall of the second tube 22 with adhesive.

[0070] In this embodiment of the invention, the adhesive bonding can effectively and tightly fix the support unit to the tube body, thereby enhancing the stability of the overall structure, minimizing the relative displacement between the support unit and the tube body, ensuring a good relative position in the blood vessel, and helping the stent to provide continuous and stable support after implantation.

[0071] In this embodiment of the present invention, optionally, the angle between the cavity of the first tube 12 and the cavity of the second tube 22 at the connection point is less than 90 degrees.

[0072] And / or,

[0073] The diameter of the first pipe body 12 is larger than the diameter of the second pipe body 22.

[0074] In this embodiment of the invention, the angle between the lumen of the first tube and the second tube is set to be less than 90 degrees. This helps to reduce turbulence and flow resistance during blood flow, thereby improving the stability and continuity of blood flow, reducing the risk of thrombosis, and thus improving the overall hemodynamic performance. Furthermore, the diameter of the first tube 12 as the main stent is larger than the diameter of the second tube 22 as the side stent. The first tube can provide a larger blood flow channel, thereby ensuring the smooth flow of the main blood flow path. This effectively reduces turbulence and resistance caused by blood flow obstruction, enhances the overall blood flow rate within the blood vessel, and reduces the risk of thrombosis. The different diameter designs of the main stent and the side stent allow for more flexible responses to different lesion conditions during treatment. The larger diameter of the main stent can effectively support the main blood flow, while the smaller diameter of the side stent can be used to support smaller collateral blood flow, optimizing the overall function of the blood vessel.

[0075] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0076] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0077] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A vascular stent, characterized in that, include: The first support includes a first support unit and a first tube. The first support unit is disposed on the first tube, extends along the length of the first tube, and abuts against the outer side wall of the first tube. The first tube has a plurality of spaced first perforated holes. The second support includes a second support unit and a second tube. The second support unit is disposed on the second tube, extends along the length of the second tube, and abuts against the outer wall of the second tube. The second tube has a plurality of spaced second perforated holes. One end of the second bracket is connected to the first bracket, and the lumen of the first tube body is in communication with the lumen of the second tube body.

2. The vascular stent according to claim 1, characterized in that, The first support unit includes a plurality of first annular structures spaced apart along the length of the first tube; And / or, The second support unit includes a plurality of second annular structures spaced apart along the length of the second tube.

3. The vascular stent according to claim 2, characterized in that, Adjacent first annular structures are connected by the first tube body; And / or, Adjacent second annular structures are connected by the second tube.

4. The vascular stent according to claim 2 or 3, characterized in that, The first annular structure is wavy and extends circumferentially along the first tube body; And / or, The second annular structure is wavy and extends circumferentially along the second tube.

5. The vascular stent according to claim 1, characterized in that, The first support unit is connected to the second support unit. The side wall of the first tube has a connection port, and the edge of the connection port is connected to the edge of the tube opening at one end of the second tube.

6. The vascular stent according to claim 5, characterized in that, The first tube has a first region and a second region, the first region is disposed between the second region, the connection port is disposed in the first region, and the distribution density of the first perforated hole in the first region is greater than the distribution density of the first perforated hole in the second region.

7. The vascular stent according to claim 6, characterized in that, The distribution density of the second perforated hole in the second tube is greater than the distribution density of the first perforated hole in the second region.

8. The vascular stent according to claim 1, characterized in that, The materials of the first support unit and the second support unit are selected from at least one of nickel-titanium alloy, cobalt-chromium alloy, stainless steel alloy, polylactic acid, magnesium alloy, and iron-aluminum alloy. And / or, The materials of the first tube and the second tube are selected from at least one of polytetrafluoroethylene, polyethylene, and polylactic acid.

9. The vascular stent according to claim 1, characterized in that, The first support unit is connected to the outer wall of the first tube body with adhesive, and the second support unit is connected to the outer wall of the second tube body with adhesive.

10. The vascular stent according to claim 1, characterized in that, The angle between the lumen of the first tube and the lumen of the second tube at the point of communication is less than 90 degrees; And / or, The diameter of the first pipe is larger than the diameter of the second pipe.

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