An implantable stent assist device

Abstract

This utility model discloses an implantable stent auxiliary device, including a delivery catheter, a guidewire body, a positioning catheter, and an auxiliary catheter. The positioning catheter is slidably disposed within the delivery catheter and sleeved on the guidewire body. The auxiliary catheter is disposed on the positioning catheter, and its outer wall is laser-engraved with several massage rings. The massage rings unfold into spherical or near-spherical hollow woven massage balls, and the surface of the massage balls is coated with heparin or phosphocholine. The positioning catheter and the auxiliary catheter can be integrally formed or separately molded, and the positioning catheter between the auxiliary catheters has a retractable spring structure. Compared with the prior art, this application, by setting the massage balls on the delivery catheter and unfolding them into spherical or near-spherical hollow woven massage balls, can better conform to the inner wall of the blood vessel, while allowing blood flow and preventing ischemia; if the position after release is not ideal, the position can be adjusted to regulate the relative displacement, which is beneficial for clinical surgical operation.

Description

Technical Field

[0001] This utility model relates to the field of implantable stent technology, and specifically to an implantable stent auxiliary device. Background Technology

[0002] Implantable stents are widely used in the treatment of vascular diseases, including coronary artery stents, peripheral vascular stents, intracranial artery stents, and aortic stent grafts. These stents are primarily used to relieve vascular stenosis, restore blood flow pathways, and repair vascular lesions such as aneurysms or dissections. In minimally invasive treatments of coronary artery disease, peripheral artery disease, stroke, and other vascular diseases, implantable stents effectively support the inner walls of blood vessels, prevent occlusion or restenosis, and restore normal blood circulation. This helps reduce ischemic injury, lowers the risk of serious complications, and improves long-term patient outcomes.

[0003] In the current technological field, traditional implantable stent-assist devices are primarily responsible for stent delivery, deployment, and positioning, ensuring the stent can successfully reach the diseased blood vessel area and remain stable. However, current products on the market present several clinical challenges: First, balloon dilation may temporarily block blood flow, leading to ischemia. Second, dense-mesh stents cannot be repositioned after full deployment. Summary of the Invention

[0004] The purpose of this invention is to propose a novel implantable stent assistance device to solve the technical problems in the prior art, such as balloon dilation obstructing blood flow and causing ischemia, and the inability to displace existing dense mesh stents after full release. To achieve the above objective, the technical solution of this invention is as follows:

[0005] An implantable stent assistance device includes a delivery catheter and a guidewire body that slides inside the delivery catheter. The implantable stent assistance device also includes a positioning catheter disposed inside the delivery catheter, the positioning catheter being slidably installed between the delivery catheter and the guidewire body.

[0006] The positioning conduit is provided with several auxiliary conduits that communicate with the interior of the positioning conduit at intervals, and each auxiliary conduit has a hollowed-out retractable massage ball on its outer wall.

[0007] The massage ball, which contracts between the auxiliary conduit and the delivery conduit, extends out of the delivery conduit and unfolds into a spherical or near-spherical shape.

[0008] Furthermore, the positioning catheter and the auxiliary catheter are integrally formed.

[0009] Furthermore, the positioning catheter and the auxiliary catheter are designed in segments, with both ends of the auxiliary catheter fixedly connected to the positioning catheter;

[0010] The positioning conduit between the auxiliary conduits is a retractable spring.

[0011] Furthermore, the auxiliary catheter is a transparent flexible tube.

[0012] Furthermore, a sidewall hole is provided on one side of the delivery conduit, and the guide wire body is inserted into the delivery conduit through the sidewall hole.

[0013] Furthermore, the outer surface of the massage ball is coated with a heparin or phosphocholine coating.

[0014] Furthermore, the massage ball is composed of several massage rings, which are disposed on the outer surface of the auxiliary conduit and formed by laser engraving. When the several massage rings are unfolded, they form a spherical or near-spherical massage ball, and after unfolding, they are woven.

[0015] Furthermore, the maximum diameter of the massage ball after unfolding is 6-10mm, and the mesh density is set between 5% and 30%.

[0016] Furthermore, an expansion rod and an expansion ring are provided inside the massage ball. The expansion ring, which has the ability to contract, is connected to the inner ring of the massage ball. One end of the expansion rod is connected to the expansion ring, and the other end is connected to the auxiliary conduit inside the massage ball near the side wall hole.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. This implantable stent-assisted device features multiple auxiliary catheters and a retractable, expandable massage ball positioned on the outer diameter of each catheter. The massage ball employs a spherical or near-spherical woven perforated structure, providing multi-point support to the blood vessel and offering excellent radial support. Simultaneously, the massage ball is less prone to shifting or slipping, improving operational precision. The massage ball conforms to the vessel wall, providing a gentle massage effect and generating minute dynamic stimulation during blood flow and catheter adjustment, promoting local blood circulation, reducing the likelihood of postoperative vasospasm, and minimizing discomfort associated with prolonged implantation. The maximum expanded diameter of the massage ball is 8mm, accommodating different vessel diameters and avoiding damage caused by excessive vessel expansion. The mesh density is controlled between 5% and 30%, providing effective support without affecting blood flow and reducing the risk of thrombosis.

[0019] 2. This implantable stent-assisted device can quickly expand the massage ball that has contracted inside the delivery catheter into a spherical or near-spherical shape after the delivery catheter is removed, and effectively provide radial support to the inner wall of the blood vessel.

[0020] 3. This implantable stent-assisted device features a retractable positioning catheter between two auxiliary catheters. If the deployed position is unsatisfactory, it can be adjusted to regulate relative displacement, facilitating clinical surgical adjustments. Simultaneously, it allows for fine adjustments during micro-movement of the sphere. During these adjustments, the perforated spherical support structure of the massage ball evenly distributes pressure, preventing single-point pressure on the vessel wall and reducing the risk of intraoperative injury. This enhances surgical safety and ensures the catheter adapts to different vascular pathways, broadening the device's applicability.

[0021] 4. The heparin or phosphocholine coating on the outer surface of the massage ball, as a biocompatible material, can effectively reduce thrombus formation, decrease inflammatory response, and promote the growth of vascular endothelial cells, thereby accelerating the postoperative recovery process. At the same time, this coating can also reduce friction between the device and the blood vessel wall, reducing discomfort during implantation and improving the patient's overall treatment experience.

[0022] 5. During the surgical procedure, the device also demonstrates exceptional flexibility and controllability. Guided by the guidewire, the delivery catheter accurately reaches the diseased blood vessel area. Subsequently, the synergistic action of the positioning catheter and the auxiliary catheter allows the massage ball to be precisely released at the required location. If the initial release position is not ideal, fine adjustments can be made using the retractable spring-structured positioning catheter to ensure optimal support for the massage ball. This design not only improves the success rate of the surgery but also significantly reduces the risk of complications caused by improper operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a first-view three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a two-dimensional structural diagram of the present invention from a second perspective;

[0026] Figure 3 This is a schematic diagram of the planar structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the unfolded shape and structure of the massage ball of this utility model;

[0028] Figure 5 This is a schematic diagram of the operation process structure of this utility model;

[0029] Figure 6 This is a schematic cross-sectional view of the present invention.

[0030] Figure 7 This is a partial cross-sectional enlarged structural schematic diagram of the present invention.

[0031] The diagram is marked as follows:

[0032] 1. Delivery catheter; 2. Positioning catheter; 3. Side wall hole; 4. Guide wire body; 5. Auxiliary catheter; 6. Massage ball; 7. Dilation rod; 8. Dilation ring. Detailed Implementation

[0033] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0034] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution of this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0035] This invention provides, for example Figures 1 to 7 The implantable stent assist device shown includes a delivery catheter 1 and a guidewire body 4 that slides inside the delivery catheter 1. A side wall hole 3 is provided on one side of the delivery catheter 1, and the guidewire body 4 passes through the side wall hole 3 into the delivery catheter 1.

[0036] A positioning conduit 2 is also provided inside the delivery conduit 1. The positioning conduit 2 is slidably installed between the delivery conduit 1 and the guidewire body 4. The outer diameter of the positioning conduit 2 is slightly smaller than the inner diameter of the delivery conduit 1, so that the positioning conduit 2 can slide inside the delivery conduit 1. At the same time, the inner diameter of the positioning conduit 2 is larger than the outer diameter of the guidewire body 4, so that the guidewire body 4 can move freely inside the positioning conduit 2.

[0037] The positioning conduit 2 is provided with two auxiliary conduits 5 that communicate with the interior of the positioning conduit 2 at intervals. The outer wall of each auxiliary conduit 5 is provided with a hollowed-out retractable massage ball 6. The massage ball 6, which is retracted between the auxiliary conduit 5 and the delivery conduit 1, extends out of the delivery conduit 1 and unfolds into a spherical or near-spherical shape. It is worth noting that the massage ball 6 is set in a spherical or near-spherical shape when unfolded. Examples of near-spherical shapes include: elliptical, olive-shaped, hemispherical, oblate, oblong, etc.

[0038] In an optional embodiment, the positioning catheter 2 and the auxiliary catheter 5 are integrally formed hollow tubes.

[0039] In another alternative embodiment, the positioning catheter 2 and the auxiliary catheter 5 are designed in segments, and the two ends of the auxiliary catheter 5 are fixedly connected to the positioning catheter 2 to form a continuous hollow tube.

[0040] In an alternative embodiment, such as Figure 1 , Figure 2 , Figure 7 As shown, the positioning catheter 2 between the two auxiliary catheters 5 is a retractable spring. Because the massage ball 6 unfolds into a spherical or elliptical structure, the retractable nature of the positioning catheter 2 allows for fine adjustment during the micro-movement of the ball. After the stent is fully released, if it is not released at the most suitable lesion site, the position between the massage balls 6 can be adjusted using the spring to facilitate clinical surgery. The hollow spherical support structure of the massage ball 6 can evenly distribute pressure, avoiding single-point pressure on the vessel wall, helping to reduce the risk of intraoperative damage, improve surgical safety, and thus ensure that the catheter can adapt to different vascular channels, expanding the applicability of the device.

[0041] In an optional embodiment, the auxiliary catheter 5 is made of a transparent material to facilitate observation of the free state of the end of the guidewire body 4 inside the auxiliary catheter 5 under X-ray irradiation.

[0042] In an optional embodiment, the massage ball 6 consists of a plurality of massage rings, such as Figure 4 As shown, massage rings are set on the outer surface of the auxiliary conduit 5 and are formed by laser engraving. When several massage rings are unfolded, they form spherical or near-spherical massage balls 6, and after unfolding, they are woven.

[0043] In an optional embodiment, the maximum diameter of the massage ball 6 after unfolding is set to 8 mm, and the mesh density of the massage ball 6 after unfolding is set between 5% and 30%. In a preferred embodiment, 5%, 10%, 15%, 20%, 25%, and 30% can be selected. The massage ball 6, after unfolding, has a spherical woven shape, providing multi-point support and forming a stable support structure within the blood vessel. This ensures that the catheter will not easily shift or slide during the procedure, improving operational precision, while also providing a gentle massage effect. The massage ball 6 slightly conforms to the vessel wall within the blood vessel, generating minute dynamic stimulation with blood flow and catheter adjustment, helping to promote local blood circulation, reducing the possibility of postoperative vasospasm, and minimizing discomfort caused by prolonged implantation. The maximum diameter of the massage ball 6 after unfolding is 8 mm, ensuring adaptability to different vessel diameters while avoiding excessive stretching of the vessel and causing damage. The mesh density is set between 5% and 30%, providing effective support without excessively obstructing blood flow, allowing blood to pass smoothly and reducing the risk of thrombosis. The woven structure allows the massage ball 6 to maintain a certain degree of flexibility after unfolding, preventing it from forming excessive rigid support and causing additional irritation to the blood vessel walls. At the same time, it can better adapt to the physiological movement of blood vessels, reduce the risk of local mechanical damage, and improve the safety and durability of the implanted device.

[0044] Alternatively, the inner and outer surfaces of the massage ball 6 may be coated with phosphocholine, which can mimic the hydrophilicity of human cell membranes, improve biocompatibility, reduce foreign body reactions, and lower the risk of blood adhesion, further preventing thrombosis. Or, the inner and outer surfaces of the massage ball 6 may be coated with heparin, which can effectively prevent platelet aggregation, reduce thrombus formation, ensure long-term patency of endovascular stents or catheters, and reduce postoperative complications.

[0045] After the guidewire body 4 enters the vascular channel and reaches the lesion location, the positioning catheter 2, delivery catheter 1, and auxiliary catheter 5 enter the vascular channel along the guidewire. The positioning catheter 2 is slid and adjusted to a suitable position, and the delivery catheter 1 is pulled outward, gradually exposing the positioning catheter 2. Figure 5 As shown in Figure I, as the auxiliary catheter 5 becomes visible, the massage ball 6 on the outer side of the auxiliary catheter 5 gradually unfolds, forming a spherical structure as shown in Figure I. Figure 5 As shown in Figure II, moderate support and massage are applied to the vessel wall to optimize the stent implantation environment. If simultaneous support and massage at two locations are required, continue withdrawing the positioning catheter 2 and unfold the second massage ball 6 as shown. Figure 5 As shown in sections III to IV, if retraction or adjustment is required, push back the delivery tube 1, and the massage ball 6 will retract to its original state. Figure 5As shown in Figure I, in order to reduce interference and ultimately achieve precise stent implantation and auxiliary support, the massage ball 6 can provide moderate support and massage to the blood vessel wall when unfolded, which helps to improve local blood flow, reduce the risk of thrombosis after stent implantation, and promote the fit between the blood vessel and the stent, thereby improving the stent fixation effect.

[0046] In a preferred embodiment, such as Figure 4 As shown, an expansion rod 7 is rotatably mounted on the side of the auxiliary conduit 5 near the side wall hole 3 inside the massage ball 6. The other end of the expansion rod 7 is rotatably connected to an expansion ring 8, which is fixed to the inner ring of the massage ball 6. When the delivery conduit 1 is withdrawn, the expansion rod 7 will cause the expansion ring 8 to unfold, and the expansion ring 8 will be in an inclined state after unfolding. When the delivery conduit 1 is advanced, the inner wall of the delivery conduit 1 will squeeze the expansion rod 7, and the expansion rod 7 will cause the expansion ring 8 to contract. When the delivery conduit 1 is withdrawn, the expansion rod 7 will rotate under the action of the torsion spring, causing the expansion ring 8 to unfold synchronously and form an inclined angle, thereby opening the massage ball 6 and providing radial support. If adjustment or retraction is required, the delivery conduit 1 will be advanced, and its inner wall will squeeze the expansion rod 7, causing the expansion ring 8 to contract and reset, and the massage ball 6 will return to its fitted state, avoiding interference with stent delivery and finally completing precise implantation. This allows the expansion ring 8 and the massage ball 6 to unfold when necessary and quickly contract and reset after the operation, avoiding unnecessary interference and improving the accuracy of stent delivery and positioning.

[0047] In summary, the implantable stent-assisted device proposed in this invention, with its unique design and multiple innovative technologies, effectively addresses clinical pain points in existing technologies and provides a new solution for the treatment of vascular diseases. Its superior performance and broad application prospects indicate that this device will play a significant role in the future medical field.

[0048] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. An implantable stent assist device, the implantable stent assist device comprising a delivery catheter (1) and a guidewire body (4) sliding inside the delivery catheter (1), characterized in that, The implantable stent auxiliary device also includes a positioning catheter (2) disposed in the delivery catheter (1), and the positioning catheter (2) is slidably installed between the delivery catheter (1) and the guidewire body (4); The positioning conduit (2) is provided with several auxiliary conduits (5) that communicate with the interior of the positioning conduit (2) at intervals, and each auxiliary conduit (5) has a hollowed-out retractable massage ball (6) on its outer wall. The massage ball (6), which contracts between the auxiliary conduit (5) and the delivery conduit (1), extends out of the delivery conduit (1) and unfolds into a spherical or near-spherical shape.

2. The implantable stent auxiliary device according to claim 1, characterized in that, The positioning catheter (2) and the auxiliary catheter (5) are integrally formed.

3. The implantable stent auxiliary device according to claim 1, characterized in that, The positioning conduit (2) and the auxiliary conduit (5) are designed in segments, and the two ends of the auxiliary conduit (5) are fixedly connected to the positioning conduit (2); The positioning conduit (2) between the auxiliary conduits (5) is a retractable spring.

4. The implantable stent auxiliary device according to claim 1, characterized in that, The auxiliary catheter (5) is a transparent flexible tube.

5. The implantable stent auxiliary device according to claim 1, characterized in that, The delivery conduit (1) has a side wall hole (3) on one side, and the guide wire body (4) passes through the side wall hole (3) into the delivery conduit (1).

6. The implantable stent auxiliary device according to claim 1, characterized in that, The surface of the massage ball (6) is coated with a heparin or choline phosphate coating.

7. The implantable stent auxiliary device according to claim 1, characterized in that, The massage ball (6) is composed of several massage rings. The massage rings are disposed on the outer surface of the auxiliary conduit (5) and are formed by laser engraving. When the massage rings are unfolded, the massage ball (6) is spherical or quasi-spherical and is woven after unfolding.

8. The implantable stent auxiliary device according to claim 7, characterized in that, The maximum diameter of the massage ball (6) after unfolding is 6-10 mm, and the mesh density is set between 5% and 30%.

9. The implantable stent auxiliary device according to claim 5, characterized in that, An expansion rod (7) and an expansion ring (8) are provided inside the massage ball (6). The expansion ring (8), which has the ability to contract, is connected to the inner ring of the massage ball (6). One end of the expansion rod (7) is connected to the expansion ring (8), and the other end is connected to the auxiliary conduit (5) inside the massage ball (6) near the side wall hole (3).

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