Thrombectomy stent and thrombectomy system

Abstract

The application relates to a thrombus-removing stent and a thrombus-removing system. The thrombus-removing stent comprises a stent inner net, a stent outer net, a first polar ring and a second polar ring. The stent outer net is wrapped outside the stent inner net and is arranged to be insulated from each other. The stent outer net and the stent inner net are both self-expanding net structures. The first polar ring is connected to the proximal end of the stent inner net, and the second polar ring is connected to the proximal end of the stent outer net. The first polar ring and the second polar ring are respectively used for electrically connecting the positive and negative poles of a power supply, so that the stent inner net and the stent outer net form a capacitor. The thrombus-removing stent and the thrombus-removing system improve the cleaning efficiency of the thrombus-removing stent.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a thrombectomy stent and thrombectomy system. Background Technology

[0002] Stent thrombectomy is an important component of mechanical thrombectomy, effectively removing acute and subacute thrombi from blood vessels. The working principle of the thrombectomy stent is as follows: the stent is delivered to the target lesion site via a delivery device; pressing or rotating the handle retracts the outer tube, causing the self-expanding stent to expand automatically under the release of restraint, trapping the thrombus within the stent's sealed mesh. After thrombectomy, the stent is repositioned back into the delivery device and removed from the body.

[0003] However, in actual surgical procedures, doctors often need to use the thrombectomy stent multiple times to completely remove the blood clot from the blood vessel. But after thrombectomy, the clot remains firmly stuck in the stent mesh, making removal difficult or even impossible. This severely impacts the efficiency of clot removal. Using multiple sets of instruments significantly increases the burden on the patient. Summary of the Invention

[0004] Based on this, a thrombectomy stent and thrombectomy system are provided to solve the problem of low thrombus removal efficiency.

[0005] On one hand, this application provides a thrombectomy stent, comprising:

[0006] Inner mesh of the bracket;

[0007] The bracket outer mesh covers the outside of the bracket inner mesh and is insulated from each other. Both the bracket outer mesh and the bracket inner mesh are self-expanding mesh structures.

[0008] A first electrode ring and a second electrode ring are connected, with the first electrode ring connected to the proximal end of the inner mesh of the support and the second electrode ring connected to the proximal end of the outer mesh of the support. The first electrode ring and the second electrode ring are used to electrically connect the positive and negative terminals of the power supply, so that the inner mesh of the support and the outer mesh of the support constitute a capacitor.

[0009] In one embodiment, the inner mesh of the bracket is connected to the negative terminal of the power supply via the first electrode ring, and the outer mesh of the bracket is connected to the positive terminal of the power supply via the second electrode ring.

[0010] In one embodiment, the inner mesh of the support includes an inner longitudinal line, an inner transverse constraint line, and inner mesh weld points. The inner longitudinal line and the inner transverse constraint line are connected by the inner mesh weld points. The outer mesh of the support includes an outer longitudinal line, an outer transverse constraint line, and outer mesh weld points. The outer longitudinal line and the outer transverse constraint line are connected by the outer mesh weld points. The inner longitudinal line and the outer longitudinal line are staggered in the circumferential direction of the thrombectomy support, and the inner transverse constraint line and the outer transverse constraint line are staggered in the axial direction of the thrombectomy support.

[0011] In one embodiment, the mesh structure of the thrombectomy bracket is made of a core wire, the two ends of which include a shape memory layer, a conductive layer and an insulating coating arranged from the inside to the outside, and the middle part of the core wire includes a shape memory layer and a conductive layer arranged from the inside to the outside.

[0012] In one embodiment, the insulating coating is a PI coating or a silicon coating.

[0013] On the other hand, this application provides a thrombectomy system, including a delivery device and a thrombectomy bracket as described above, wherein the delivery device is connected to the thrombectomy bracket and the delivery device is used to deliver the thrombectomy bracket.

[0014] In one embodiment, the delivery device includes an inner tube, an outer tube, a circuit assembly, and a handle. The outer tube is axially movable and sleeved on the outside of the inner tube. The distal end of the inner tube is connected to the distal end of the thrombectomy bracket, and the thrombectomy bracket can be mounted between the outer wall of the inner tube and the inner wall of the outer tube. When the outer tube moves proximally relative to the inner tube, the thrombectomy bracket is released from the distal end of the outer tube and self-expands. The handle is used to operate the outer tube to move axially relative to the inner tube. The circuit assembly is electrically connected to the first polar ring and the second polar ring and is used to supply power to the first polar ring and the second polar ring under the control of the handle.

[0015] In one embodiment, the circuit assembly includes wires, a power supply, and a PCB board. The power supply is electrically connected to the PCB board, and the wires are used to electrically connect the first and second electrode rings to the PCB board. The handle is provided with a switch for controlling the PCB board so that the power supply energizes the first and second electrode rings via the wires.

[0016] In one embodiment, a portion of the wire is located between the inner wall of the outer tube and the outer wall of the inner tube, and the outer tube is axially movable relative to the wire.

[0017] In one embodiment, both the first polar ring and the second polar ring are fixedly connected to the inner tube.

[0018] In the aforementioned thrombectomy stent and system, the first and second electrode rings can be electrically connected to the positive and negative terminals of a power source, energizing the inner and outer stent meshes. This results in one mesh carrying a positive charge and the other a negative charge, thus forming a capacitor. Therefore, after thrombectomy, when cleaning the thrombus from the stent surface, energizing the first and second electrode rings allows the inner and outer meshes to form a capacitor. This causes negatively charged components in the thrombus, such as red blood cells, white blood cells, and fibrin, to rapidly move towards the positive terminal of the capacitor, reducing the thrombus volume and increasing its density, making it easier for the thrombus to detach from the stent and improving the cleaning efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, 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 this application. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the thrombectomy system according to one embodiment of this application.

[0021] Figure 2 This is a partial structural schematic diagram of a thrombectomy system according to one embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the charge distribution of a local structure of the thrombectomy support when it is energized in a thrombectomy system according to an embodiment of this application.

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the two ends of the core wire used in the retrieval system according to one embodiment of this application.

[0024] Figure 5 This is a schematic cross-sectional view of the middle portion of the core wire used in the retrieval system according to one embodiment of this application.

[0025] Figure 6 This is a schematic diagram of the circuit principle of the thrombectomy system according to one embodiment of the present application, in which the circuit components supply power to the inner network and outer network of the support.

[0026] Figure label:

[0027] 1. Bolt retrieval system; 2. Bolt retrieval bracket; 3. Circuit assembly; 4. Handle; 11. Conical head; 12. Inner tube; 13. Outer tube; 14. Luer connector; 21. Bracket outer mesh; 22. Bracket inner mesh; 23. First pole ring; 24. Second pole ring; 31. Wire; 32. Power supply; 33. PCB board; 41. Housing; 411. First housing; 412. Second housing; 42. Switch; 43. Groove; 44. Push block; 45. Push rod; 46. Fixing block; 211. Outer longitudinal line; 212. Outer transverse constraint line; 213. Outer mesh solder joint; 221. Inner longitudinal line; 222. Inner transverse constraint line; 223. Inner mesh solder joint; 2001. Shape memory layer; 2002. Conductive layer; 2003. Insulating coating. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0030] The terms “vertical,” “horizontal,” “up,” “down,” “left,” “right,” and similar expressions are for illustrative purposes only and do not represent the only possible implementation.

[0031] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] It should be noted that the terms "distal" and "proximal" are used as directional terms, which are commonly used in the field of interventional medical devices. "Distal" refers to the end away from the operator (such as the doctor) during the procedure, while "proximal" refers to the end closer to the operator. Axial direction refers to the direction in which the central axis of the medical device extends; radial direction refers to the direction perpendicular to the aforementioned axial direction.

[0033] Combination Figure 1 and Figure 2 As shown, one embodiment of this application provides a thrombectomy system 1, which includes a thrombectomy bracket 2 and a conveying device. The conveying device is used to convey the thrombectomy bracket 2 and to manipulate the thrombectomy bracket 2 to perform thrombectomy.

[0034] The thrombectomy bracket 2 includes an outer bracket mesh 21, an inner bracket mesh 22, a first electrode ring 23, and a second electrode ring 24. The outer bracket mesh 21 covers the outside of the inner bracket mesh 22 and is insulated from each other. Both the outer bracket mesh 21 and the inner bracket mesh 22 are self-expanding mesh structures. The first electrode ring 23 is connected to the proximal end of the inner bracket mesh 22, and the second electrode ring 24 is connected to the proximal end of the outer bracket mesh 21. The first electrode ring 23 and the second electrode ring 24 are used to electrically connect the positive and negative terminals of the power supply 32, so that the inner bracket mesh 22 and the outer bracket mesh 21 constitute a capacitor.

[0035] In the thrombectomy stent 2 of this embodiment, the first electrode ring 23 and the second electrode ring 24 can be electrically connected to the positive and negative terminals of the power supply 32 to energize the inner stent mesh 22 and the outer stent mesh 21. Thus, one of the inner stent mesh 22 and the outer stent mesh 21 carries a positive charge, and the other carries a negative charge, thereby forming a capacitor. Therefore, after thrombectomy using the thrombectomy stent 2, when it is necessary to clean the thrombus on the surface of the thrombectomy stent 2, energizing the first electrode ring 23 and the second electrode ring 24 can cause the inner stent mesh 22 and the outer stent mesh 21 to form a capacitor. In this way, negatively charged components such as red blood cells, white blood cells, and fibrin in the thrombus rapidly move towards the positive terminal of the capacitor, reducing the thrombus volume and increasing its density, thereby making it easier for the thrombus to detach from the thrombectomy stent 2 and improving the cleaning efficiency of the thrombectomy stent 2. It should be noted that after the thrombus volume is reduced by energizing the inner stent mesh 22 and the outer stent mesh 21, the thrombus on the thrombectomy stent 2 can be cleared by tapping and / or flushing with saline.

[0036] Understandably, for the charged inner mesh 22 and outer mesh 21 of the support, a capacitor structure is formed between each mesh.

[0037] Continue to combine Figure 1 and Figure 2As shown, in some embodiments, the delivery device includes an inner tube 12, an outer tube 13, a circuit assembly 3, and a handle 4. The outer tube 13 is axially movable and sleeved on the outside of the inner tube 12. The distal end of the inner tube 12 is connected to the distal end of the thrombectomy bracket 2, and the thrombectomy bracket 2 can be mounted between the outer wall of the inner tube 12 and the inner wall of the outer tube 13. When the outer tube 13 moves proximally relative to the inner tube 12, the thrombectomy bracket 2 is released from the distal end of the outer tube 13 and self-expands. The handle 4 is used to operate the outer tube 13 to move axially relative to the inner tube 12. The circuit assembly 3 is electrically connected to the first polar ring 23 and the second polar ring 24, and is used to supply power to the first polar ring 23 and the second polar ring 24 under the control of the handle 4.

[0038] In this embodiment, since the circuit assembly 3 can energize the inner stent mesh 22 and the outer stent mesh 21 via the first polarity ring 23 and the second polarity ring 24, after the thrombectomy stent 2 is used to remove the thrombus, the handle 4 can control the circuit assembly 3 to supply power to the first polarity ring 23 and the second polarity ring 24, so that the inner stent mesh 22 and the outer stent mesh 21 form a capacitor. In this way, negatively charged components such as red blood cells, white blood cells, and fibrin in the thrombus rapidly move towards the positive electrode of the capacitor, reducing the thrombus volume and increasing its density, thus making it easier for the thrombus to detach from the thrombectomy stent 2, thereby improving the cleaning efficiency of the thrombectomy stent 2. It should be noted that after the thrombus volume is reduced by energizing the inner stent mesh 22 and the outer stent mesh 21, the thrombus on the thrombectomy stent 2 can be cleaned by tapping and / or rinsing with saline.

[0039] It should be noted that during thrombectomy using the thrombectomy system 1, the thrombectomy stent 2 can first be delivered to the target lesion site requiring thrombus removal using the delivery device. Then, the operating handle 4 is used to move the outer tube 13 proximally relative to the inner tube 12, releasing the thrombectomy stent 2 distal to the outer tube 13. Thus, the thrombectomy stent 2 expands radially under its own expansion. The expanded thrombectomy stent 2 can abut against the vessel wall, facilitating the collection of thrombi from the vessel wall when both the outer tube 13 and the inner tube 12 are moved proximally simultaneously. Understandably, for the thrombectomy stent 2, which includes an inner stent network 22 and an outer stent network 21, the thrombus is primarily collected in the inner stent network 22. Because the inner stent network 22 and the outer stent network 21 are insulated from each other to form a capacitor, a small amount of thrombus may enter the gap between the inner stent network 22 and the outer stent network 21.

[0040] Combination Figure 2As shown, in some embodiments, circuit assembly 3 includes wires 31, a power supply 32, and a PCB board 33. The power supply 32 is electrically connected to the PCB board 33, and the wires 31 are used to electrically connect the first electrode ring 23 and the second electrode ring 24 to the PCB board 33. The PCB board 33 serves as the carrier of the circuit. The handle 4 is equipped with a switch 42, which acts as a power supply switch 42 for controlling the PCB board 33, so that the power supply 32 energizes the first electrode ring 23 and the second electrode ring 24 via the wires 31. Understandably, the PCB board 33 has corresponding positive and negative connection points, each of which energizes the first electrode ring 23 and the second electrode ring 24 via corresponding wires 31.

[0041] The wire 31 can be 16 strands of copper wire, and there is no limitation here. The power supply 32 can be a lithium battery, alkaline battery, dry cell battery, etc., and the voltage parameters can be selected as 3V, 6V, or 12V, etc. The higher the voltage, the more charge the circuit provides, and the faster the migration speed of components such as red blood cells, white blood cells, and fibrin.

[0042] like Figure 6 As shown, in some embodiments, the inner stent mesh 22 is connected to the negative terminal of the power supply 32 via a first electrode ring 23, and the outer stent mesh 21 is connected to the positive terminal of the power supply 32 via a second electrode ring 24. Thus, positive charges are transferred to the surface of the outer stent mesh 21, and negative charges are transferred to the surface of the inner stent mesh 22. Subsequently, negatively charged components in the thrombus, such as red blood cells, white blood cells, and fibrin, rapidly move towards the outer stent mesh 21, reducing the thrombus volume and increasing its density. Since the outer stent mesh 21 covers the outside of the inner stent mesh 22, thrombi moving towards the outer stent mesh 21 are more easily removed.

[0043] In some implementations, the pins of switch 42 are connected to PCB board 33 to enable switch 42 to control the circuit of PCB board 33.

[0044] Switch 42 can be a push-button switch with an indicator light. When the push-button switch is turned on, the indicator light illuminates green, and the circuit operates normally. Pressing the push-button switch again turns off the indicator light, and the circuit is disconnected.

[0045] Combination Figure 3 As shown, in some embodiments, the inner mesh 22 of the support includes an inner longitudinal line 221, an inner transverse constraint line 222, and an inner mesh weld point 223, wherein the inner longitudinal line 221 and the inner transverse constraint line 222 are connected by the inner mesh weld point 223. Understandably, the inner mesh weld point 223 is located at the intersection of the inner longitudinal line 221 and the inner transverse constraint line 222.

[0046] The outer mesh 21 of the support includes an outer longitudinal line 211, an outer transverse constraint line 212, and an outer mesh solder joint 213. The outer longitudinal line 211 and the outer transverse constraint line 212 are connected by the outer mesh solder joint 213. Understandably, the outer mesh solder joint 213 is located at the intersection of the outer longitudinal line 211 and the outer transverse constraint line 212.

[0047] The inner longitudinal line 221 and the outer longitudinal line 211 are staggered circumferentially on the bolt-retrieving bracket 2, and the inner transverse constraint line 222 and the outer transverse constraint line 212 are staggered axially on the bolt-retrieving bracket 2. Since the outer mesh 21 and the inner mesh 22 are insulated from each other, there are no solder joints between them. Understandably, because the inner mesh 22 is electrically connected to the first polar ring 23, when the first polar ring 23 energizes the inner mesh 22, all electrical structures of the inner mesh 22, such as the inner longitudinal line 221, the inner transverse constraint line 222, and the inner mesh solder joint 223, carry the same charge. Correspondingly, because the outer mesh 21 is electrically connected to the second polar ring 24, when the second polar ring 24 energizes the outer mesh 21, the outer longitudinal line 211, the outer transverse constraint line 212, and the outer mesh solder joint 213 of the outer mesh 21 carry the same charge, and the charge is opposite to that of the inner mesh 22. Thus, each grid forms a capacitor structure. Specifically, adjacent inner longitudinal lines 221 and outer longitudinal lines 211 form capacitors by connecting different electrodes, and adjacent inner transverse constraint lines 222 and outer transverse constraint lines 212 form capacitors by connecting different electrodes.

[0048] It should be noted that the materials used for the inner mesh 22 and the outer mesh 21 of the support can be the same or different. For ease of description, the materials used to make the inner mesh 22 and the outer mesh 21 of the support will be collectively referred to as "core wires", that is, the material of the mesh structure of the stent 2 is the core wire.

[0049] Combination Figure 4 and Figure 5 As shown, in some embodiments, the two ends of the core wire include a shape memory layer 2001, a conductive layer 2002, and an insulating coating 2003 arranged from the inside out. The insulating coating 2003 provides insulation by covering the conductive layer 2002. The middle portion of the core wire includes the shape memory layer 2001 and the conductive layer 2002 arranged from the inside out, without the need for the insulating coating 2003. This allows the middle portion of the core wire to receive charge through the exposed conductive layer 2002. In this embodiment, the insulating coating 2003 is located at both ends of the core wire to provide insulation and prevent charge migration and neutralization at the ends of the core wire.

[0050] The insulating coating 2003 can be a PI coating or a silicon coating, etc. These coatings have good insulation properties, preventing charge migration and neutralization at the ends of the core wire. The conductive layer 2002 is made of a highly conductive material such as stainless steel. When the first electrode ring 23 and the second electrode ring 24 energize the inner mesh 22 and the outer mesh 21 of the support, the conductive layers 2002 in the inner mesh 22 and the outer mesh 21 carry different charges. Because the conductive layer 2002 is made of a highly conductive material such as stainless steel, rapid charge migration can be achieved.

[0051] In some embodiments, the shape memory layer 2001 is made of Niti material, which provides good self-expansion performance for the thrombectomy stent 2. This facilitates the release and retrieval of the thrombectomy stent 2 from the distal end of the outer tube 13 and back into the outer tube 13.

[0052] In some embodiments, both the first polar ring 23 and the second polar ring 24 are fixedly connected to the inner tube 12. Thus, the first polar ring 23 and the second polar ring 24 can not only supply power to the inner stent network 22 and the outer stent network 21, but also fix the proximal ends of the inner stent network 22 and the outer stent network 21 to the inner tube 12, thereby improving the connection stability between the thrombectomy stent 2 and the inner tube 12. This facilitates the application of axial tension to the thrombectomy stent 2 by the inner tube 12 during the thrombectomy process, ensuring that both the proximal and distal ends of the thrombectomy stent 2 are stably connected to the inner tube 12 and are less likely to fall off, causing thrombectomy failure or even leaving the thrombectomy stent 2 in the blood vessel, thus posing a surgical risk.

[0053] It should be noted that the first electrode ring 23 and the second electrode ring 24 can be bonded and fixed to the inner tube 12. In some embodiments, one end of the first electrode ring 23 is welded to the core wire of the inner mesh 22 of the bracket, and the other end is connected to the wire 31 in the circuit assembly 3; one end of the second electrode ring 24 is welded to the core wire of the outer mesh 21 of the bracket, and the other end is connected to another wire 31 in the circuit assembly 3. The first electrode ring 23 and the second electrode ring 24 can be made of 304 stainless steel, which has strong conductivity.

[0054] See again Figure 1 As shown, in some embodiments, the delivery device further includes a conical head 11 connected to the distal end of the inner tube 12. When the thrombectomy stent 2 is housed between the inner tube 12 and the outer tube 13, the conical head 11 blocks the distal end of the outer tube 13, thereby facilitating the movement of the outer tube 13 along the blood vessel and reducing the likelihood of the outer tube 13 scratching the blood vessel wall.

[0055] The conical head 11 can be made of a high-molecular polymer and doped with a certain proportion of imaging material, such as Pebax+BaSO4 or Pebax+W, with a doping ratio of 5%-40%. The conical head 11 provides process visualization for the positioning and release of the thrombectomy stent 2, facilitating precise control of the stent 2's position. The inner tube 12 can be made of materials such as PI, Pebax, or PEEK, and its inner bore allows for the passage of a 0.035” guidewire. The outer tube 13 can be a composite material; for example, it may include an inner layer, an intermediate layer, and an outer layer, with the intermediate layer located between the inner and outer layers. The inner layer can be made of PTFE to provide a low coefficient of friction and lubrication. The intermediate layer can be a braided or spring-loaded structure. The outer layer can be Pebax or PA12, providing both support and flexibility.

[0056] The handle 4 includes a housing 41 and a push assembly. The push assembly is connected to the proximal end of the outer tube 13. The push assembly has an operating part exposed in the housing 41. The operating part can push the push assembly to move axially relative to the housing 41, thereby driving the outer tube 13 to move axially relative to the inner tube 12.

[0057] In this embodiment, the push component can be easily operated by the operating part exposed on the outer casing 41, so that the push component drives the outer tube 13 to move axially relative to the inner tube 12.

[0058] When the pushing component moves the outer tube 13 proximally, the distal end of the outer tube 13 moves proximally relative to the distal end of the inner tube 12, causing the thrombectomy stent 2, connected to the distal end of the inner tube 12, to move out from the distal end of the outer tube 13. Subsequently, the thrombectomy stent 2, losing the radial constraint of the outer tube 13, expands radially under its own expansion force. At this time, moving the inner tube 12 and outer tube 13 proximally together allows the expanded thrombectomy stent 2 to collect the thrombus. After the thrombectomy stent 2 completes the thrombectomy procedure, when it needs to be removed from the body, the operating part can be pushed distally, causing the pushing component to move the outer tube 13 distally relative to the inner tube 12, thus retracting the thrombectomy stent 2, along with the captured thrombus, from the distal end of the outer tube 13 back into the outer tube 13. In this way, moving the inner tube 12 and outer tube 13 proximally together withdraws the thrombectomy system 1 from the body. At this time, the surface of the thrombectomy stent 2 is adhered to the thrombectomy stent 2. When clearing the thrombus on the stent 2, the circuit assembly 3 supplies power to the first electrode ring 23 and the second electrode ring 24, causing the inner stent mesh 22 and the outer stent mesh 21 to form a capacitor. Negatively charged components in the thrombus on the stent 2, such as red blood cells, white blood cells, and fibrin, rapidly move towards the positive electrode of the capacitor, reducing the thrombus volume and increasing its density. This makes it easier for the thrombus to detach from the stent 2, improving the cleaning efficiency of the stent 2 and reducing the waiting time for thrombus removal when the stent 2 is used again. This allows the thrombectomy system 1 to be used again more quickly, improving thrombectomy efficiency, reducing surgical time, and lowering surgical risks.

[0059] Combination Figure 1 and Figure 2 As shown, in some embodiments, the housing 41 has a groove 43, and the pushing component can move along the groove 43 toward the distal end and toward the proximal end.

[0060] Specifically, the actuating assembly includes a push block 44, a push rod 45, and a fixing block 46. The push rod 45 passes through a groove 43. The push block 44 and the fixing block 46 are connected to both ends of the push rod 45. At least a portion of the structure of the push block 44 is exposed outside the housing 41 to form an operating part. The fixing block 46 is located inside the housing 41 and is connected to the proximal end of the outer tube 13. In this way, the push block 44 can be pushed, causing the push rod 45 to move the fixing block 46, thereby realizing the movement of the outer tube 13 relative to the inner tube 12. The groove 43 provides the push block 44 with movement space and limitation, making the movement of the push block 44 relative to the housing 41 more stable.

[0061] The surface of the push block 44 is textured to increase friction and prevent slippage, facilitating the pushing operation of the push block 44. In some embodiments, the push block 44 is made of ABS or PC, the push rod 45 is made of ASB, and the fixing block 46 is made of ABS or PC, etc. The materials of each component are not limited here.

[0062] It should be noted that the PCB board 33 has a cutout slot, through which the push rod 45 passes, and the push rod 45 can move towards the far end and towards the near end at the cutout slot. In this way, the cutout slot ensures that the PCB board 33 does not interfere with the movement of the push rod 45, allowing the push rod 45 to move freely at the cutout slot, ensuring the flexibility of driving the outer tube 13 to move axially relative to the inner tube 12.

[0063] In some embodiments, the proximal end of the outer tube 13 passes through the middle of the fixing block 46, and the proximal end of the outer tube 13 is fixedly connected to the fixing block 46. One end of the two wires 31 used for electrically connecting the positive and negative terminals of the power supply 32 is connected to the PCB board 33 and can movably pass through the fixing block 46, so that the other end is connected to the first electrode ring 23 and the second electrode ring 24 respectively. It should be noted that part of the structure of the wires 31 is located between the inner wall of the outer tube 13 and the outer wall of the inner tube 12, and the outer tube 13 can move axially relative to the wires 31. Therefore, when the outer tube 13 moves axially relative to the inner tube 12, the outer tube 13 will not exert traction on the wires 31, so as to avoid damage to the wires 31 and causing poor electrical performance.

[0064] In some embodiments, the proximal end of the handle 4, such as the proximal end of the housing 41, is provided with a Luer connector 14, which is connected to the inner tube 12 by means including but not limited to injection molding or adhesive.

[0065] It should be noted that, as Figure 1 and Figure 2 As shown, the outer casing 41 includes a first casing 411 and a second casing 412. The first casing 411 and the second casing 412 have limiting structures at their proximal ends. These limiting structures restrict the movement of the Luer connector 14, thereby allowing the Luer connector 14 to fix the inner tube 12 to the outer casing 41. The outer casing 41 can be made of PC / ABS or ABS, etc., and the Luer connector 14 can be made of PC or PP, etc. Specific Implementation Example 1:

[0067] The delivery conduit of the delivery device has an outer diameter of 8F and an effective length of 1300mm. The inner tube 12 has a total length of 1570mm, an outer diameter of 1.25mm, and an inner diameter of 0.93mm, allowing passage of a 0.035” guidewire. The inner tube 12 is made of PI material. The tapered head 11 has a length of 30mm, a maximum outer diameter of 2.33mm, a proximal orifice of 1.90mm, and a through-hole of 0.93mm, allowing for smooth passage of the guidewire. The tapered head 11 is made of Pebax 3533, doped with W as the developing material, with a W doping ratio of 20%. The outer tube 13 has an outer diameter of 2.33mm and an inner diameter of… 1.80mm. The inner layer is PTFE, 50µm thick. The middle layer is a braided layer made of 304 stainless steel round wire with a diameter of 0.06mm, using a 1-over-2 braiding method. The outer layer is made of Pebax 5533, providing both support and flexibility. The outer tube 13 is 1100mm long. The distal bore of the Luer connector 14 is 1.35mm in diameter and made of PC. The inner tube 12 passes through the outer tube 13, and its distal end is glued to the proximal bore of the tapered head 11. The proximal end connects to the Luer connector 14.

[0068] The core wire used in the stent outer mesh 21 is a round wire with a diameter of 0.3 mm, coated with a PI coating at both ends, with a coating thickness of 50 µm. The conductive layer 2002 is made of 304 stainless steel with a thickness of 0.15 mm; the shape memory layer 2001 is made of Nitti material with a thickness of 0.15 mm. The outer longitudinal lines 211 of the outer mesh are 200 mm long and have 6 strands; the outer transverse constraint lines 212 are made of the same material as the outer longitudinal lines 211, are uncoated, have a wire diameter of 0.3 mm, and span from the first outer longitudinal line 211 to the last outer longitudinal line 211, connected to each longitudinal line by solder joints. There are 7 transverse constraint lines, with the longitudinal density gradually increasing, i.e., the mesh gradually decreasing, to prevent thrombus escape. The proximal end of the stent outer mesh 21 is closed at the first polar ring 23 and welded to the first polar ring 23. The first polar ring 23 is a semi-ring with an outer diameter of 1.60 mm, an inner diameter of 1.30 mm, and a thickness of 1.0 mm. It is made of 304 stainless steel and is bonded to the inner tube 12. Its distal end tapers to the proximal hole of the conical head 11 and is bonded to the conical head 11. The outer diameter of the expanded stent outer mesh 21 is 8 mm. It is suitable for thrombectomy of the femoropopliteal vein. The material, wire diameter, and number of strands of the stent inner mesh 22 are the same as those of the stent outer mesh 21, and its expanded outer diameter is 7 mm. Its proximal end tapers to the second polar ring 24, which is also a semi-ring with the same inner and outer diameters and thickness as the first polar ring 23, but does not overlap with the first polar ring 23 in the longitudinal direction.

[0069] Wire 31 is a 16-strand copper wire with a nylon sheath. Wire 31 has an outer diameter of 0.30mm, and the copper wire has an outer diameter of 0.05mm. One end has its nylon sheath stripped and is welded to the first electrode ring 23 / second electrode ring 24. It is located in the sandwich between the inner tube 12 and the outer tube 13. The other end has its nylon sheath stripped and is welded to the positive and negative electrodes. Power supply 32 uses a 6V dry cell battery.

[0070] The outer casing 41 is made of PC / ABS with a matte finish. It is 300mm long, 100mm wide, and 50mm thick. The outer casing 41 includes a first casing 411 and a second casing 412. A limiting port at the near end restricts the movement of the Luer connector 14, ensuring accurate positioning of the far end of the conveying device. The switch 42 is located 100mm from the near end, with its pin connected to the PCB board 33. The switch 42 is a push-button switch with a ring-shaped LED strip. When the switch 42 is pressed, the green LED strip illuminates, indicating normal circuit operation. Pressing it again turns off the indicator light, disconnecting the circuit. The groove 43 is 250mm long, with a limiting position at 200mm. During use, the push block 44 is moved backward (towards the near end) to the limiting position of the groove 43 to release the circuit; resetting it retracts the bracket. The push block 44 is gourd-shaped, with a large circle dimension of 30mm and a length of 30mm; a small circle dimension of 20mm and a length of 20mm; and a multi-faceted surface to increase the coefficient of friction. Push block 44 is connected to push rod 45 in the middle. Push rod 45 is cylindrical with an outer diameter of 20mm and a length of 20mm. The distal end of push rod 45 is connected to fixing block 46. Fixing block 46 has an outer diameter of 4mm and a length of 40mm. The large hole has a diameter of 2.50mm and is bonded to the outer tube 13. The through hole has a diameter of 1.35mm to facilitate the passage of inner tube 12. Push block 44, push rod 45, and fixing block 46 are all made of ABS. Specific Implementation Example 2:

[0072] The delivery device and thrombectomy stent 2 in Example 2 are consistent with those in Example 1. The difference lies in the power supply 32 in the circuit assembly 3, which provides 12V. Specifically, the power supply 32 can be two 6V dry batteries connected in series. Everything else remains unchanged. At 12V, the thrombus organization is accelerated, reducing the waiting time for thrombus removal. Specific Implementation Example 3:

[0074] The delivery device and thrombectomy stent 2 in Example 3 are consistent with those in Example 1. The power supply 32 of the circuit assembly 3 is also consistent with that in Example 2. The difference is that an adjustable variable resistor is added to the circuit assembly 3, and an adjustable knob is added to the handle 4. Rotating the adjustable knob increases the voltage across the inner and outer networks of the thrombectomy stent 2 when the variable resistor decreases, and decreases the voltage across the inner and outer networks of the thrombectomy stent 2 when the variable resistor increases. This achieves adjustable voltage and thrombus removal speed. Specific Implementation Example 4:

[0076] The delivery device and thrombectomy stent 2 in Example 4 are consistent with those in Example 1. The difference lies in the material: the conductive layer 2002 is made of 0.22mm thick 304 stainless steel; the shape memory layer 2001 is made of 0.08mm thick Nitrate material. Other conditions are consistent with Example 1. Compared to Example 1, the thickened 304 stainless steel layer also has a cutting effect on the thrombus. The inner conductive layer 2002 has a thickness of 0.08mm, and the shape memory layer 2001 has a thickness of 0.22mm, which can maintain the same size after expansion.

[0077] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0078] It should be noted that, in the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0079] In this application, unless otherwise expressly specified and limited, the first feature being "on" or "below" the second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A thrombectomy stent, characterized by, The application relates to a stent, which comprises: a stent inner net; a stent outer net, which is wrapped outside the stent inner net and is arranged in insulation with each other, and the stent outer net and the stent inner net are both self-expanding net structures; a first pole ring and a second pole ring, the first pole ring is connected to the proximal end of the stent inner net, the second pole ring is connected to the proximal end of the stent outer net, and the first pole ring and the second pole ring are respectively used for electrically connecting the positive and negative poles of a power supply, so that the stent inner net and the stent outer net form a capacitor.

2. The thrombus retrieval cage of claim 1, wherein, The stent inner net is connected to the negative pole of the power supply through the first pole ring, and the stent outer net is connected to the positive pole of the power supply through the second pole ring.

3. The thrombus retrieval cage of claim 1 or 2, wherein, The stent inner net comprises inner longitudinal lines, inner transverse constraint lines and inner net welding points, the inner longitudinal lines and the inner transverse constraint lines are connected through the inner net welding points, the stent outer net comprises outer longitudinal lines, outer transverse constraint lines and outer net welding points, and the outer longitudinal lines and the outer transverse constraint lines are connected through the outer net welding points; the inner longitudinal lines and the outer longitudinal lines are arranged in a staggered mode in the circumferential direction of the stent, and the inner transverse constraint lines and the outer transverse constraint lines are arranged in a staggered mode in the axial direction of the stent.

4. The thrombus retrieval cage of claim 1, wherein, The material of the net structure of the stent is a core wire, both ends of the core wire comprise a shape memory layer, a conductive layer and an insulating coating arranged from inside to outside, and the middle part of the core wire comprises a shape memory layer and a conductive layer arranged from inside to outside.

5. The thrombus retrieval cage of claim 4, wherein, The insulating coating is a PI coating or a silicon coating.

6. A thrombectomy system, comprising: The application further relates to a delivery device and the stent, the delivery device is connected with the stent, and the delivery device is used for delivering the stent.

7. The thrombectomy system of claim 6, wherein, The delivery device comprises an inner tube, an outer tube, a circuit assembly and a handle, the outer tube is arranged on the outer tube in an axially movable mode, the distal end of the inner tube is connected with the distal end of the stent, the stent can be loaded between the outer wall of the inner tube and the inner wall of the outer tube, when the outer tube moves towards the proximal end relative to the inner tube, the stent is released from the distal end of the outer tube and self-expands, the handle is used for controlling the axial movement of the outer tube relative to the inner tube, and the circuit assembly is electrically connected with the first pole ring and the second pole ring and is used for supplying power to the first pole ring and the second pole ring under the control of the handle.

8. The thrombectomy system of claim 7, wherein, The circuit assembly comprises an electric wire, a power supply and a PCB board, the power supply is electrically connected with the PCB board, the electric wire is used for electrically connecting the first pole ring and the second pole ring with the PCB board, the handle is provided with a switch, and the switch is used for controlling the PCB board, so that the power supply supplies power to the first pole ring and the second pole ring through the electric wire.

9. The thrombectomy system of claim 8, wherein, Part of the structure of the electric wire is located between the inner wall of the outer tube and the outer wall of the inner tube, and the outer tube can move axially relative to the electric wire.

10. The thrombectomy system of claim 7, wherein, The first pole ring and the second pole ring are both fixedly connected with the inner tube.

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