Blood vessel thrombus extraction device capable of efficiently cutting thrombus
By designing a self-expanding thrombectomy stent that combines a sculpted stent with a woven mesh basket, the problem of thrombus residue and vascular damage caused by insufficient or excessive expansion force in the treatment of large-diameter thrombi by self-expanding stents is solved, achieving efficient cutting and safe thrombectomy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-03-31
AI Technical Summary
Existing self-expanding stents are prone to dislodgement when treating large-diameter thrombi due to insufficient expansion force, or excessive expansion force leading to thrombus residue. Furthermore, they may not completely remove the thrombus, posing a high risk of surgical complications and vascular damage.
Design a self-expanding thrombectomy stent comprising an engraved stent and a woven mesh basket. The engraved stent is fixedly connected to the woven mesh basket. The stent expands by being driven by a push rod. The engraved stent cuts the thrombus, and the woven mesh basket collects the cut thrombus. The expansion force is controlled to prevent vascular damage, and through holes are provided on the stent to prevent vascular blockage.
It improves the thrombus cutting effect, ensures efficient thrombus removal, shortens operation time, enhances the safety of thrombus removal, and prevents vascular damage and blockage.
Smart Images
Figure CN224056042U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thrombectomy stent technology, and in particular to a vascular thrombectomy device for efficiently cutting thrombi. Background Technology
[0002] Deep vein thrombosis (DVT) is a common peripheral venous disease in clinical practice. Most patients with DVT have no obvious symptoms, leading to a high rate of missed or misdiagnosed cases in the early stages; only 20% of DVT cases are clinically diagnosed.
[0003] Thrombectomy stents are currently an effective treatment method for peripheral venous thrombosis in clinical practice. Self-expanding thrombectomy stents represent a significant innovation in modern stent thrombectomy technology. These stents feature a self-expanding design, offering excellent flexibility and sustained expansion force. They can adhere to and fixate on the vessel wall, effectively capturing and removing thrombi. Their operation is simple, as they can be delivered to the thrombus site via catheter technology, significantly improving the treatment outcome of vascular embolism and reducing surgical risks and recovery time for patients. While self-expanding thrombectomy stents have significant advantages in treating vascular embolism, they also have some drawbacks. For example, the expansion force of self-expanding thrombectomy stents is limited by the stent's shape and structure. When targeting large-diameter vessels, if the outward expansion force is small, the fit to large thrombi may be poor, leading to thrombus detachment. Conversely, if the outward expansion force is large, the retrieval force may be large, resulting in stent deformation and thrombus detachment during retrieval, and insufficient thrombus removal, potentially leading to thrombus residue. These shortcomings urgently require improvement. Utility Model Content
[0004] The purpose of this invention is to provide a highly efficient thrombectomy device for cutting thrombi, which improves the thrombus cutting effect, increases the efficiency of thrombus removal, and enhances the safety of thrombus removal.
[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a highly efficient thrombectomy device for cutting thrombi, comprising a protective sleeve and a thrombectomy assembly, wherein the protective sleeve has a receiving cavity along its length for receiving the thrombectomy assembly, the thrombectomy assembly comprising a push rod, a traction wire fixedly connected to the end of the push rod, and a self-expanding thrombectomy stent disposed on the traction wire, wherein the push rod drives the self-expanding thrombectomy stent in the receiving cavity to be pushed out from the receiving cavity, thereby automatically radially expanding the self-expanding thrombectomy stent from the receiving state to the use state;
[0006] The self-expanding thrombectomy stent includes a carved bracket and a woven mesh basket fixedly connected together. The end of the carved bracket away from the woven mesh basket is fixedly connected to the push rod, and the end of the woven mesh basket away from the carved bracket is fixedly connected to the traction wire. The carved bracket can be elastically compressed or expanded in the radial direction, and drive the woven mesh basket to synchronously contract or expand in the radial direction relative to the traction wire. In the expanded state, the carved bracket and the woven mesh basket have a number of through holes for blood flow.
[0007] By adopting the above technical solution, in the initial state, the self-expanding thrombectomy stent is compressed and housed in the receiving cavity of the protective sheath. The head of the protective sheath is passed through the thrombus, and then the push rod is pushed. The push rod pushes the self-expanding thrombectomy stent out of the receiving cavity end through the traction wire, so that the self-expanding thrombectomy stent and the protective sheath are separated. The sculpted stent expands radially to the use state by its own self-expansion force. Since the sculpted stent is fixedly connected to the end of the braided basket, the radially expanding sculpted stent drives the braided basket to expand radially in sync. Then, by pulling the push rod, the self-expanding thrombectomy stent is driven to move. During the movement of the self-expanding thrombectomy stent, the sculpted stent can be used to cut around the thrombus. The dislodged thrombus is collected and removed by a woven mesh basket. This invention utilizes the radial expansion of a carved stent to drive the woven mesh basket to expand synchronously. The two work together to control the radial expansion force of the self-expanding thrombectomy stent, ensuring that the stent expands to fit snugly against the inner wall of the blood vessel. This prevents excessive radial expansion force from damaging the blood vessel, effectively shortening the operation time and improving the safety of thrombus removal. In addition, the through holes formed on the carved stent and woven mesh basket in the expanded state allow blood to pass through the self-expanding thrombectomy stent, preventing vascular blockage. This invention improves the thrombus cutting effect, increases the efficiency of thrombus removal, and enhances the safety of thrombus removal.
[0008] A further feature of this invention is that the woven basket is tapered, and the woven basket includes a large end and a small end, with the outer diameter of the woven basket gradually decreasing from the large end to the small end.
[0009] By adopting the above technical solution, the tapered woven mesh basket occupies less space when stored in the accommodating cavity, thus improving the convenience of storing the woven mesh basket.
[0010] A further feature of this invention is that the small end of the woven basket is fixedly connected to the traction wire via a first developing ring.
[0011] By adopting the above technical solution, the addition of the first imaging ring improves the imaging effect of the tip of the self-expanding thrombectomy stent after it is introduced into the blood vessel, and improves the positioning ability and imaging effect of the self-expanding thrombectomy stent.
[0012] A further feature of this invention is that the carving bracket has a mesh-like cylindrical structure, and the end of the carving bracket near the push rod has a slanted insertion port.
[0013] By adopting the above technical solution, the oblique cut into the thrombus opening can ensure that the cut thrombus is more easily collected by the woven basket after passing through the engraved stent, and ensure that the engraved stent can be compressed efficiently during storage, reducing the space occupied by the engraved stent during compression.
[0014] A further feature of this invention is that one end of the carving bracket connected to the woven basket has several cut skirt edges formed along the circumference.
[0015] By adopting the above technical solution, the cutting skirt can cut the residual thrombus on the inner wall of the blood vessel, thereby improving the cutting effect of this utility model on thrombus.
[0016] A further feature of this invention is that the end of the cutting skirt furthest from the push rod is provided with a developing point.
[0017] By adopting the above technical solution, the addition of imaging sites makes it easier for medical staff to clearly distinguish the boundary between the sculpted stent and the woven mesh basket located in the blood vessel.
[0018] A further feature of this invention is that the end of the engraving bracket furthest from the woven basket is fixedly connected to the end of the push rod via a second developing ring.
[0019] By adopting the above technical solution, the second imaging ring can make it easier for medical staff to clearly see the position of the end of the engraved stent near the push rod in the blood vessel.
[0020] A further feature of this invention is that one end of the traction wire passes through the self-expanding thrombectomy bracket and extends to form a guide head, the outer diameter of which gradually decreases from the end near the self-expanding thrombectomy bracket to the end away from the self-expanding thrombectomy bracket.
[0021] By adopting the above technical solution, the head can be guided to explore within blood vessels, thereby guiding the present invention to quickly reach the predetermined position.
[0022] A further feature of this invention is that the carving support is composed of several cutting strips, and the sidewalls of the cutting strips are provided with several cutting edges along the length direction.
[0023] By adopting the above technical solution, the cutting edges of multiple cutting strips cooperate with each other to perform circumferential cutting around the thrombus in the blood vessel, so that the thrombus can be cut off quickly, thereby improving the cutting efficiency of the present invention for thrombi.
[0024] A further feature of this invention is that the protective sleeve has a guide wire insertion cavity arranged parallel to the accommodating cavity, the inlet of the guide wire insertion cavity is connected to the side wall of the protective sleeve, the outlet of the guide wire insertion cavity is connected to the end of the protective sleeve, and the protective sleeve has a beveled guide surface corresponding to the outlet.
[0025] By adopting the above technical solution, the guidewire can enter the guidewire passage cavity through the inlet and exit through the outlet. The oblique guide surface can ensure the guidance and smoothness of the protective cannula when passing through the blood vessel.
[0026] In summary, this utility model has the following beneficial effects:
[0027] The thrombectomy device of this invention consists of a carved support, a braided mesh, a push rod, a traction wire, and a protective sleeve. Initially, the self-expanding thrombectomy support is compressed and housed within the receiving cavity of the protective sleeve. The head of the protective sleeve is passed through the thrombus, and then the push rod is pushed. The push rod, via the traction wire, pushes the self-expanding thrombectomy support out of the receiving cavity, separating the self-expanding thrombectomy support from the protective sleeve. The carved support then expands radially to its usable state due to its own self-expansion force. Because the carved support is fixedly connected to the end of the braided mesh basket, the radially expanding carved support drives the braided mesh basket to expand radially synchronously. Then, by pulling the push rod, the self-expanding thrombectomy support is moved. During the movement of the self-expanding thrombectomy support, the carved support can be used to... The thrombus is cut around its perimeter, and the cut-off thrombus is collected and removed by a woven mesh basket. This invention utilizes a carved support that expands radially, causing the woven mesh basket to expand synchronously. The two work together to control the radial expansion force of the self-expanding thrombectomy stent, ensuring that the stent expands to fit snugly against the inner wall of the blood vessel. This prevents excessive radial expansion force from damaging the blood vessel, effectively shortening the operation time and improving the safety of thrombus removal. In addition, the through holes formed on the carved support and woven mesh basket in the expanded state allow blood to pass through the self-expanding thrombectomy stent, preventing vascular blockage. This invention improves the thrombus cutting effect, increases the efficiency of thrombus removal, and enhances the safety of thrombus removal. Attached Figure Description
[0028] Figure 1 This is an overall structural diagram of the present invention, showing the self-expanding bolt removal bracket in its retracted state.
[0029] Figure 2 This is a utility model Figure 1 A magnified view of a portion of region A in the middle.
[0030] Figure 3 This is a utility model Figure 1 A magnified view of a portion of region B in the middle.
[0031] Figure 4This is an overall structural diagram of the present invention, showing the self-expanding thrombectomy bracket in use.
[0032] Figure 5 This is a partial enlarged view of the carving support of this utility model.
[0033] In the diagram: 1. Protective sleeve; 11. Receptacle; 12. Guide wire insertion cavity; 121. Wire inlet; 122. Wire outlet; 13. Beveled guide surface; 2. Push rod; 3. Traction wire; 31. Guide head; 4. Self-expanding retrieval bracket; 41. Engraving bracket; 411. Beveled retrieval inlet; 412. Second developing ring; 413. Cutting strip; 4131. Cutting edge; 414. Through hole; 42. Woven basket; 421. Large end; 422. Small end; 4221. First developing ring; 423. Cutting skirt; 4231. Developing point; 5. Locking device. Detailed Implementation
[0034] The present invention will be further described below with reference to the accompanying drawings.
[0035] A highly efficient thrombectomy device for cutting thrombi, such as Figure 1-4 As shown, the device includes a protective sleeve 1 and a bolt removal assembly. The protective sleeve 1 has a receiving cavity 11 along its length for housing the bolt removal assembly. The bolt removal assembly includes a push rod 2, a traction wire 3 fixedly connected to the end of the push rod 2, and a self-expanding bolt removal bracket 4 disposed on the traction wire 3. The push rod 2 drives the self-expanding bolt removal bracket 4, which is in the stored state, to be pushed out of the receiving cavity 11, so that the self-expanding bolt removal bracket 4 automatically expands radially from the stored state to the use state. The self-expanding bolt removal bracket 4 includes a carved bracket 41 and a woven mesh basket 42 fixedly connected. One end of the woven mesh basket 42 away from the woven mesh basket 42 is fixedly connected to the push rod 2, and the other end of the woven mesh basket 42 away from the carving bracket 41 is fixedly connected to the traction wire 3. The carving bracket 41 can be elastically compressed or expanded in the radial direction, and drive the woven mesh basket 42 to synchronously contract or expand in the radial direction relative to the traction wire 3. Several through holes 414 for blood circulation are formed on the carving bracket 41 and the woven mesh basket 42 in the expanded state. In this embodiment, a locking device 5 is provided at the tail end of the protective sleeve 1. The locking device 5 is used to lock and position the push rod 2 relative to the protective sleeve 1.
[0036] like Figure 1-2 and Figure 4As shown, the woven mesh basket 42 is tapered, comprising a large end 421 and a small end 422. The outer diameter of the woven mesh basket 42 gradually decreases from the large end 421 to the small end 422. The tapered design of the woven mesh basket 42 reduces the space occupied when stored in the receiving cavity 11, improving its ease of storage. The small end 422 of the woven mesh basket 42 is fixedly connected to the traction wire 3 via a first imaging ring 4221. The addition of the first imaging ring 4221 improves the visibility of the tip of the self-expanding thrombectomy stent 4 after it is inserted into the blood vessel. The imaging effect is improved, enhancing the positioning capability and imaging effect of the self-expanding thrombectomy stent 4; the engraved stent 41 has a mesh-like cylindrical structure, and the end of the engraved stent 41 near the push rod 2 has a slanted thrombectomy inlet 411. The slanted thrombectomy inlet 411 ensures that the cut thrombus can be more easily collected by the woven basket 42 after passing through the engraved stent 41, and ensures that the engraved stent 41 can be efficiently compressed during storage, reducing the space occupied by the engraved stent 41 during compression; the end of the engraved stent 41 connected to the woven basket 42 has several circumferentially formed cutting skirts 4. 23. The cutting edge 423 can cut residual thrombi on the inner wall of blood vessels, improving the thrombus cutting effect of this invention; the end of the cutting edge 423 away from the push rod 2 is provided with a contrast point 4231. The addition of the contrast point 4231 makes it easier for medical personnel to clearly distinguish the boundary between the carved stent 41 and the woven mesh basket 42 located in the blood vessel; the end of the carved stent 41 away from the woven mesh basket 42 is fixedly connected to the end of the push rod 2 through the second contrast ring 412. The second contrast ring 412 makes it easier for medical personnel to clearly distinguish the carved stent. The end of the frame 41 near the push rod 2 is positioned in the blood vessel; one end of the traction wire 3 passes through the self-expanding thrombectomy stent 4 and extends to form a guide head 31. The outer diameter of the guide head 31 gradually decreases from the end near the self-expanding thrombectomy stent 4 to the end away from the self-expanding thrombectomy stent 4. In this embodiment, the traction wire 3 can be made of a tough metal wire or a polymer fiber filament, and the guide head 31 of the traction wire 3 has sufficient flexibility to bend freely. The guide head 31 can explore in the blood vessel, thereby guiding the present invention to quickly reach the predetermined position.
[0037] like Figure 3-4 As shown, the protective sleeve 1 has a guide wire passage cavity 12 arranged parallel to the receiving cavity 11. The inlet 121 of the guide wire passage cavity 12 is connected to the side wall of the protective sleeve 1, and the outlet 122 of the guide wire passage cavity 12 is connected to the end of the protective sleeve 1. The protective sleeve 1 has a beveled guide surface 13 corresponding to the outlet 122. The guide wire can enter the guide wire passage cavity 12 through the inlet 121 and exit through the outlet 122. The beveled guide surface 13 can ensure the guidance and smoothness of the protective sleeve 1 when it passes through the blood vessel.
[0038] like Figure 1-2 and Figure 5As shown, the engraving support 41 is composed of several cutting strips 413, and the sidewalls of the cutting strips 413 are provided with several cutting edges 4131 along the length direction. The cutting edges 4131 of the multiple cutting strips 413 cooperate with each other to perform circumferential cutting around the thrombus in the blood vessel, so that the thrombus can be quickly cut off, improving the efficiency of thrombus cutting of this utility model. Adjacent cutting strips 413 cooperate with each other to form multiple matrix-distributed through holes 414 on the surface of the engraving support 41, allowing blood flow. In the use state, each through hole 414 of the engraving support 41 is parallelogram-shaped. The cut strips 413 are distributed in a wavy pattern, and at each intersection of the cut strips 413, a total of four cut strips 413 are formed at the connection node. The cut strips 413 between adjacent connection nodes are wavy. The individual unit of the carved flower pattern of the carved support 41 adopts an asymmetrical design. When the carved support 41 is retrieved and released, it can guide the force through its short side. The cut strips 413 of the carved support 41 adopt a chamfered design, which makes it easy to lock the thrombus and increase the fitting degree of the carved support 41 for large thrombi. When the carved support 41 expands, the woven basket 42 connected to it can expand at the same time to achieve the function of intercepting thrombi.
[0039] The basic working principle of this utility model is as follows: The thrombectomy device consists of a carved bracket 41, a braided mesh, a push rod 2, a traction wire 3, and a protective sleeve 1. In the initial state, the self-expanding thrombectomy bracket 4 is compressed and housed in the receiving cavity 11 of the protective sleeve 1. The head of the protective sleeve 1 is passed through the thrombus, and then the push rod 2 is pushed. The push rod 2 pushes the self-expanding thrombectomy bracket 4 out from the end of the receiving cavity 11 through the traction wire 3, so that the self-expanding thrombectomy bracket 4 separates from the protective sleeve 1. The carved bracket 41 expands radially to the working state by its own self-expansion force. Since the carved bracket 41 is fixedly connected to the end of the braided mesh basket 42, the radially expanding carved bracket 41 drives the braided mesh basket 42 to expand radially in sync. Then, by pulling the push rod 2, the self-expanding thrombectomy bracket 4 is driven to move. During the movement, the self-expanding thrombectomy bracket 4... The sculpted support 41 can be used to cut around the thrombus, and the cut-off thrombus is collected and removed by the woven basket 42. This invention utilizes the radial expansion of the sculpted support 41 to drive the woven basket 42 to expand synchronously. The two work together to control the radial expansion force of the self-expanding thrombectomy stent 4, so that the self-expanding thrombectomy stent 4 is just expanded to fit against the inner wall of the blood vessel, preventing the blood vessel from being damaged due to excessive radial expansion force of the self-expanding thrombectomy stent 4. This effectively shortens the operation time and improves the safety of thrombus removal. In addition, the through holes 414 formed on the sculpted support 41 and the woven basket 42 in the expanded state are used to allow blood to pass through the self-expanding thrombectomy stent 4, preventing blood vessel blockage. It has the effects of improving the thrombus cutting effect, the efficiency of thrombus removal, and the safety of thrombus removal.
[0040] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.
Claims
1. A vascular thrombectomy device for efficient cutting of thrombus, characterized in that: The application relates to a protective sleeve (1) and a stent retrieval assembly, wherein the protective sleeve (1) is provided with a receiving cavity (11) along the length direction for accommodating the stent retrieval assembly; the stent retrieval assembly comprises a push rod (2), a traction wire (3) fixedly connected to the end of the push rod (2), and a self-expanding stent retrieval support (4) arranged on the traction wire (3); the push rod (2) drives the self-expanding stent retrieval support (4) in the accommodating state to be pushed out from the receiving cavity (11), so that the self-expanding stent retrieval support (4) is automatically radially expanded from the accommodating state to the using state. The self-expanding stent retrieval support (4) comprises a fixedly connected engraved support (41) and a woven mesh basket (42); one end of the engraved support (41) away from the woven mesh basket (42) is fixedly connected to the push rod (2); one end of the woven mesh basket (42) away from the engraved support (41) is fixedly connected to the traction wire (3); the engraved support (41) can be radially elastically compressed or expanded, and drives the woven mesh basket (42) to be synchronously contracted or expanded in the radial direction relative to the traction wire (3); and a plurality of through holes (414) for blood circulation are formed on the engraved support (41) and the woven mesh basket (42) in the expanded state.
2. The device of claim 1, wherein: The woven mesh basket (42) is conical; the woven mesh basket (42) comprises a large-end end (421) and a small-end end (422); and the outer diameter of the woven mesh basket (42) gradually decreases from the large-end end (421) to the small-end end (422).
3. The device of claim 1, wherein: The small-end end (422) of the woven mesh basket (42) is fixedly connected to the traction wire (3) through a first developing ring (4221).
4. The device of claim 1, wherein: The engraved support (41) is in a meshed cylinder structure; and a bevelled plug-in opening (411) is formed on one end of the engraved support (41) close to the push rod (2).
5. The device of claim 1, wherein: One end of the engraved support (41) connected to the woven mesh basket (42) is formed with a plurality of cutting skirt edges (423) in the circumferential direction.
6. The device of claim 5, wherein: The cutting skirt edges (423) are provided with developing sites (4231) at one end away from the push rod (2).
7. The device of claim 1, wherein: One end of the engraved support (41) away from the woven mesh basket (42) is fixedly connected to the end of the push rod (2) through a second developing ring (412).
8. The device of claim 1, wherein: One end of the traction wire (3) passes through the self-expanding stent retrieval support (4) and extends to form a guide head (31); the outer diameter of the guide head (31) gradually decreases from one end close to the self-expanding stent retrieval support (4) to one end away from the self-expanding stent retrieval support (4).
9. The device of claim 1, wherein: The engraved support (41) is composed of a plurality of cutting strips (413); and a plurality of cutting edges (4131) are arranged on the side walls of the cutting strips (413) in the length direction.
10. The device of claim 1, wherein: The protective sleeve (1) is provided with a guide wire through cavity (12) arranged in parallel with the accommodating cavity (11), the wire inlet (121) of the guide wire through cavity (12) is communicated to the side wall of the protective sleeve (1), the wire outlet (122) of the guide wire through cavity (12) is communicated to the end of the protective sleeve (1), and the protective sleeve (1) is provided with a bevel guide surface (13) corresponding to the wire outlet (122).