Thrombus aspiration catheter

Abstract

The thrombus aspiration catheter comprises a conveying pipe, a reducer pipe and an electric field regulation and control assembly, the conveying pipe comprises a near end and a far end which extend into a blood vessel, the near end is communicated with external aspiration equipment, the far end is communicated with the reducer pipe, and an electric stimulation activation polymerization piece is arranged in the reducer pipe. The electric field regulation and control assembly is configured to act on the electrical stimulation activation polymer through an electric field so as to control expansion or contraction of the reducer pipe. According to the thrombus aspiration catheter, the caliber can be increased during thrombus aspiration, the aspiration range and efficiency can be improved, the caliber can be reduced when the thrombus aspiration catheter stretches into a blood vessel, positioning and operation in the blood vessel are facilitated, and compared with the mode that the caliber is adjusted through gas, the electric field change response controlled through the electric field regulation and control assembly is faster, and the operation efficiency is improved. Therefore, the variable-diameter section can be adjusted to the required caliber more timely, flexible adjustment of the diameter of the thrombus aspiration catheter is achieved, and thrombus aspiration efficiency and effect are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a thrombus aspiration catheter. Background Art

[0002] In existing intravascular thrombus removal surgeries, thrombus aspiration is an effective thrombus removal method. The thrombus is mechanically removed through an aspiration catheter to restore the normal blood flow of the blood vessel. However, currently, the aspiration catheters on the market generally have some problems. For example, in order to better reach the designated position, the diameter of the aspiration catheter is generally relatively small, resulting in a small thrombus aspiration range. And in order to increase the thrombus aspiration range, after the diameter of the aspiration catheter is enlarged, there will be a problem of difficult positioning. The movement difficulty of the aspiration catheter in the body increases. Whether the diameter of the aspiration catheter is larger or smaller will cause different problems. This contradiction is likely to cause the prolongation of the operation time and the increase of the operation complexity.

[0003] Some existing aspiration catheters achieve variable diameter through an airbag, but the adjustment accuracy of the airbag is relatively low, and the diameter cannot be quickly changed at the expected position, and it cannot well meet the needs of different thrombus positions and sizes. Therefore, these problems restrict the operation efficiency of doctors, affect the treatment effect, and limit the application and popularization of thrombus aspiration. Summary of the Utility Model

[0004] To solve various problems brought by the diameter size of the thrombus aspiration catheter in the prior art, the purpose of the utility model is to provide a thrombus aspiration catheter that can quickly change the diameter size.

[0005] To achieve the above utility model purpose, an embodiment of the utility model provides a thrombus aspiration catheter, which includes a delivery tube, a variable diameter tube, and an electric field regulation component. The delivery tube includes a proximal end and a distal end along the direction of extending into the blood vessel. The proximal end is connected to an external aspiration device, and the distal end is connected to the variable diameter tube. An electrostimulated active polymer and an electrode plate are arranged in the variable diameter tube. The electrode plate is electrically connected to the electric field regulation component. The electric field regulation component is configured to regulate the electric field at the electrode plate to drive the deformation of the electrostimulated active polymer connected thereto, so that the variable diameter tube expands or contracts.

[0006] As a further improvement of the utility model, the electrode plate includes an outer electrode plate and an inner electrode plate. The variable diameter tube includes an outer wall, the outer electrode plate, the electrostimulated active polymer, the inner electrode plate, and an inner wall arranged in sequence from outside to inside along the thickness direction of the tube wall.

[0007] When the outer electrode plate is connected to the positive electrode and the inner electrode plate is connected to the negative electrode, the variable diameter tube expands, and the diameter of at least part of the variable diameter tube increases.

[0008] When the inner electrode sheet is connected to the positive electrode and the outer electrode sheet is connected to the negative electrode, the diameter-changing tube contracts, and the diameter of at least a part of the diameter-changing tube decreases.

[0009] As a further improvement of the present invention, when the diameter-changing tube expands, the diameter of the diameter-changing tube gradually increases in the direction away from the distal end;

[0010] When the diameter-changing tube contracts, the diameter of the diameter-changing tube gradually decreases in the direction away from the distal end.

[0011] As a further improvement of the present invention, a first electric wire and a second electric wire are arranged in the conveying tube, the outer electrode sheet is electrically connected to the electric field regulation component through the first electric wire, and the inner electrode sheet is electrically connected to the electric field regulation component through the second electric wire;

[0012] Insulating members are coated on the outer sides of the first electric wire and the second electric wire.

[0013] As a further improvement of the present invention, both the inner electrode sheet and the outer electrode sheet are arranged around the axis of the diameter-changing tube;

[0014] The inner electrode sheet and the outer electrode sheet are set to have the same shape.

[0015] As a further improvement of the present invention, both the inner electrode sheet and the outer electrode sheet are set to be in a hollow shape, triangle, square, circle, polygon, or serrated shape;

[0016] When both the inner electrode sheet and the outer electrode sheet are set to be serrated, the serrated peak parts of the inner electrode sheet are aligned with the serrated valley parts of the outer electrode sheet, and the serrated valley parts of the inner electrode sheet are aligned with the serrated peak parts of the outer electrode sheet.

[0017] As a further improvement of the present invention, both the outer wall and the inner wall are made of insulating members.

[0018] As a further improvement of the present invention, the inner electrode sheet, and / or the outer electrode sheet, and / or the distal end are made of a radiopaque material.

[0019] As a further improvement of the present invention, the electro-stimulated activated polymer is set to be a composition made of one or more of ionic electro-stimulated activated polymers having ion exchange ability;

[0020] Alternatively, the electro-stimulated activated polymer is set to be an electronic electro-stimulated activated polymer;

[0021] Alternatively, the electro-stimulated activated polymer is set to be an electrostrictive elastomer.

[0022] As a further improvement of the present utility model, the delivery tube includes a support section relatively close to the proximal end and a transition section relatively close to the distal end, and the stiffness of the transition section is less than that of the support section;

[0023] Hydrophilic coatings are provided on the outer surface of the transition section and the outer surface of the diameter-changing tube.

[0024] Compared with the conventional technology, the present utility model has the following beneficial effects: The thrombus aspiration catheter realizes the expansion and contraction of the diameter-changing tube through the electric field regulation component, and can adjust the diameter of the thrombus aspiration catheter as needed. It can increase the diameter during thrombus aspiration to improve the aspiration range and efficiency, and can reduce the diameter when the thrombus aspiration catheter extends into the blood vessel to facilitate positioning and operation in the blood vessel. Moreover, compared with adjusting the diameter through gas in the background technology, controlling the change of the electric field by the electric field regulation component has a faster reaction, so that the diameter-changing section can be adjusted to the required diameter size more timely. The thrombus aspiration catheter realizes flexible adjustment of the diameter of the thrombus aspiration catheter on the premise of ensuring safety and operation convenience, and improves the efficiency and effect of thrombus aspiration. Description of the Drawings

[0025] Figure 1 is a schematic structural view of the thrombus aspiration catheter according to an embodiment of the present utility model;

[0026] Figure 2 is a schematic structural view of the thrombus aspiration catheter in a contracted state according to an embodiment of the present utility model;

[0027] Figure 3 is a schematic structural view of the thrombus aspiration catheter in an expanded state according to an embodiment of the present utility model;

[0028] Figure 4 is a cross-sectional view of a partial structure of the thrombus aspiration catheter in a contracted state according to an embodiment of the present utility model;

[0029] Figure 5 is a cross-sectional view of a partial structure of the thrombus aspiration catheter in an expanded state according to an embodiment of the present utility model;

[0030] Figure 6 is a cross-sectional view of the diameter-changing tube according to an embodiment of the present utility model;

[0031] Figure 7 is a schematic structural view of the electrode plate according to an embodiment of the present utility model;

[0032] Figure 8 is a schematic structural view of the cooperation between the inner electrode plate and the outer electrode plate according to an embodiment of the present utility model;

[0033] Among them, 100 is a thrombus aspiration catheter; 10 is a delivery tube; 11 is a support section; 111 is the proximal end; 12 is a transition section; 121 is the distal end; 20 is a diameter-changing tube; 21 is the inner wall; 22 is the outer wall; 23 is an electro-stimulated activated polymer; 24 is an electrode plate; 241 is the inner electrode plate; 242 is the outer electrode plate; 243 is the serrated peak part; 244 is the serrated valley part; 25 is a conducting wire; 251 is the second wire; 252 is the first wire; 26 is an insulating part; 30 is an electric field regulation component; 40 is the inner cavity. Detailed implementation manners

[0034] The following will describe the present utility model in detail in conjunction with the specific implementation manners shown in the drawings. However, these implementation manners do not limit the present utility model, and any structural, method, or functional transformation made by those of ordinary skill in the art according to these implementation manners is included in the protection scope of the present utility model.

[0035] It should be understood that the spatially relative position terms used herein, such as "above", "upper", "below", "lower", etc., are for the purpose of facilitating description to describe the relationship of one unit or feature relative to another unit or feature as shown in the drawings. The spatially relative position terms may be intended to include different orientations of the device in use or operation other than the orientation shown in the figures.

[0036] An embodiment of the present utility model provides a thrombus aspiration catheter that can quickly change the caliber size.

[0037] The thrombus aspiration catheter 100 of this embodiment is as Figure 1 shown, and includes a delivery tube 10, a diameter-changing tube 20, and an electric field regulation component 30. The delivery tube 10 includes a proximal end 111 and a distal end 121 along the direction of extending into the blood vessel. The proximal end 111 is connected to an external aspiration device, and the distal end 121 is connected to the diameter-changing tube 20. Among them, the end closer to the operator is the proximal end 111, and the end farther from the operator is the distal end 121. An electro-stimulated activated polymer 23 and an electrode plate 24 are arranged in the diameter-changing tube 20. The electrode plate 24 is electrically connected to the electric field regulation component 30. The electric field regulation component 30 is configured to regulate the electric field at the electrode plate 24 to drive the electro-stimulated activated polymer 23 to deform, so that the diameter-changing tube 20 expands or contracts, thereby achieving the purpose of enlarging or reducing the end of the thrombus aspiration catheter 100.

[0038] The electro-stimulated activated polymer 23 has conductive and electrostrictive effects. The electro-stimulated activated polymer 23 deforms under the action of the electric field formed by the electrode plate 24 to drive the diameter-changing tube 20 to expand or contract. Specifically, the electro-stimulated activated polymer 23 has a cation adsorption property. The hydrated cations gather towards the negative electrode of the electric field while causing different deformation degrees of the electro-stimulated activated polymer 23, thereby regulating the diameter to become larger or smaller.

[0039] The process of the expansion or contraction of the variable-diameter tube 20 is circumferential stretching expansion or contraction in the radial direction. When expanding, the inner diameter of the variable-diameter tube 20 increases, which can more effectively cover and aspirate thrombus. When contracting, the outer diameter of the variable-diameter tube 20 decreases, which can more effectively transport and position. By regulating the electric field of the electrode sheet 24 through the electric field regulating component 30, precise control of the tube diameter of the variable-diameter tube 20 is achieved, improving the flexibility and operational convenience of the operation, and ensuring more efficient transportation, positioning, and safer thrombus removal during the operation.

[0040] Specifically, during the transportation of the thrombus aspiration catheter 100, through the electrostrictive effect, the opening diameter of the variable-diameter tube 20 of the thrombus aspiration catheter 100 can be reduced, as Figure 2 shown, so as to facilitate the transportation of the thrombus aspiration catheter 100 to the lesion site, that is, the thrombus, and solve the problem of difficult catheter positioning. During thrombus aspiration, through the electrostrictive effect, the variable-diameter tube 20 of the thrombus aspiration catheter 100 can undergo circumferential expansion, as Figure 3 shown, to expand the opening diameter of the variable-diameter tube 20 of the thrombus aspiration catheter 100, so as to increase the thrombus aspiration range of the blood vessel wall and the thrombus removal effect, and solve problems such as small thrombus aspiration range, low aspiration efficiency, and poor effect. This design provides a high degree of flexibility during the operation, allowing the doctor to adjust the shape and size of the thrombus aspiration catheter 100 according to the specific situation, facilitating the positioning and thrombus aspiration in the blood vessel.

[0041] Furthermore, as Figures 4 - 6 shown, the electrode sheet 24 includes an outer electrode sheet 242 and an inner electrode sheet 241. The variable-diameter tube 20 includes an outer wall 22, an outer electrode sheet 242, an electro-stimulated activated polymer 23, an inner electrode sheet 241, and an inner wall 21 arranged in sequence from outside to inside along the wall thickness direction. The outer wall 22 and the inner wall 21 can both be set as insulating parts, and the insulating parts can be insulating materials or materials with an insulating layer coated on the surface.

[0042] Among them, the outer wall 22 is made of a hard material, which can provide the necessary supporting force to maintain the shape and stiffness of the thrombus aspiration catheter 100. The inner wall 21 is a material with a low friction coefficient, such as polytetrafluoroethylene (PTFE), to ensure the smooth movement of the thrombus aspiration catheter 100 in the blood vessel.

[0043] The outer electrode sheet 242 and the inner electrode sheet 241 can be metal-based electrode sheets, and the electrode sheet 24 is connected to the electric field regulating component 30 to play a conductive role. The metal-based electrode sheet can be one or several of conductive metals such as gold, palladium, silver, platinum, and copper, or a composite of conductive metals and materials such as carbon nanotubes and graphene.

[0044] Combining these structures, the working process is described again:

[0045] When the thrombus aspiration catheter 100 moves in the body, asFigure 4 As shown, both the outer electrode sheet 242 and the inner electrode sheet 241 are electrically connected to the electric field regulation component 30, where the outer electrode sheet 242 is connected to the negative electrode and the inner electrode sheet 241 is connected to the positive electrode. At this time, a part of the electrostimulated activated polymer 23 near the outer electrode sheet 242 expands, causing at least a part of the variable diameter tube 20 to contract inward, that is, the outer diameter of at least a part of the variable diameter tube 20 decreases, as Figure 2 shown. Specifically, under the action of the externally connected electric field regulation component 30, an electric field is generated between the inner electrode sheet 241 and the outer electrode sheet 242 to form a potential difference. The hydrated cations tightly combined with the electrostimulated activated polymer 23 will move towards the negative electrode and accumulate in the negative electrode region near the outer wall of the tube, that is, gather at the outer wall 22 of the variable diameter tube 20, expanding the negative electrode region. At the same time, the hydrated cations at the inner wall 21 are relatively sparse, causing the electrostimulated activated polymer 23 near the inner wall 21 to contract. Eventually, it is manifested as a force from the outer wall 22 to the inner wall 21, and the variable diameter tube 20 undergoes a circumferential contraction deformation.

[0046] After the thrombus aspiration catheter 100 is delivered in place, as Figure 5 shown, both the outer electrode sheet 242 and the inner electrode sheet 241 are electrically connected to the electric field regulation component 30, where the outer electrode sheet 242 is connected to the positive electrode and the inner electrode sheet 241 is connected to the negative electrode. At this time, a part of the electrostimulated activated polymer 23 near the inner electrode sheet 241 expands, causing the variable diameter tube 20 to expand outward, that is, the inner diameter of at least a part of the variable diameter tube 20 increases, as Figure 3 shown. Specifically, at this time, an opposite electric field is generated between the inner electrode sheet 241 and the outer electrode sheet 242. The force-bearing process of the variable diameter tube 20 is opposite to that during contraction. The hydrated cations accumulate in the negative electrode region near the inner side wall of the tube, that is, gather at the inner wall 21 of the variable diameter tube 20, causing the electrostimulated activated polymer 23 near the inner wall 21 to expand. Eventually, it is manifested as a force from the inner wall 21 to the outer wall 22, and the variable diameter tube 20 undergoes a circumferential expansion deformation.

[0047] By controlling the change of the electric field at the electrode sheet 24 through the electric field regulation component 30, the expansion and contraction states of the variable diameter tube 20 can be quickly and accurately adjusted, thereby realizing the dynamic adjustment of the diameter of the thrombus aspiration catheter 100. This design improves the flexibility of the operation, enables the thrombus aspiration catheter 100 to adapt to thrombi of different sizes and positions, and improves the effect of thrombus aspiration.

[0048] The design of the insulating parts of the outer wall 22 and the inner wall 21 ensures that the current only flows between the electrode sheet 24 and the electrostimulated activated polymer 23, and will not generate an electrostimulating effect on other tissues in the blood vessel, increasing the safety of using the thrombus aspiration catheter 100. At the same time, the insulating material or insulating layer can prevent electrolyte erosion and extend the service life of the thrombus aspiration catheter 100.

[0049] Furthermore, both the inner electrode sheet 241 and the outer electrode sheet 242 are electrically connected to the electric field control component 30 through a conductive wire 25 disposed in the delivery tube 10. As shown in Figure 4 , 5 , the conductive wire 25 includes a first wire 252 and a second wire 251. The outer electrode sheet 242 is electrically connected to the electric field control component 30 through the first wire 252, and the inner electrode sheet 241 is electrically connected to the electric field control component 30 through the second wire 251.

[0050] Both the first wire 252 and the second wire 251 are made of a highly conductive material, and an insulating member 26 is coated on the outside of both. The setting of the insulating member 26 further prevents current leakage and interference on the basis that both the outer wall 22 and the inner wall 21 use insulating members, improving safety and efficiency. On the other hand, it can prevent the electro-stimulated activated polymer 23 near the first wire 252 and the second wire 251 from deforming. That is to say, the design of the insulating member 26 ensures that the expansion or contraction caused by the electro-stimulated activated polymer 23 only occurs at the target position of the thrombus aspiration catheter 100, that is, the position of the variable diameter tube 20.

[0051] The electric field control component 30 includes a power supply and a control unit. The power supply is used to provide the required voltage and current, and the control unit is used to adjust the direction and intensity of the electric field. The control unit is connected to the first wire 252 and the second wire 251, and the first wire 252 and the second wire 251 are respectively connected to the outer electrode sheet 242 and the inner electrode sheet 241 to facilitate the regulation of the electric field direction.

[0052] When the control unit changes the direction of the electric field, the variable diameter tube 20 switches between the contracted state and the expanded state, and the corresponding aperture decreases or increases. When the control unit changes the magnitude of the current, that is, changes the strength of the electric field formed between the outer electrode sheet 242 and the inner electrode sheet 241, the degree of expansion or contraction of the variable diameter tube 20 changes. The stronger the electric field, the greater the degree of expansion or contraction, and the weaker the electric field, the smaller the degree of expansion or contraction. That is to say, the electric field control component 30 can accurately change the aperture size of the variable diameter tube 20. Compared with adjusting the aperture through gas in the background technology, this design can accurately control the direction and intensity of the electric field, so as to accurately adjust the state of the variable diameter tube 20, improving the flexibility and precision of the operation, and making the adjustment of the thrombus aspiration catheter 100 more convenient.

[0053] In addition, the connection of the positive and negative poles of the first wire 252 and the second wire 251 to the corresponding electric field control component 30 is not limited to Figure 4 and 5 connection methods, and can depend on the materials used for the electro-stimulated activated polymer 23 to determine the wiring of the positive and negative poles.

[0054] Furthermore, when the variable-diameter tube 20 expands under the action of an electric field, the diameter of the variable-diameter tube 20 gradually increases in a direction away from the distal end 121; when the variable-diameter tube 20 contracts under the action of an electric field, the diameter of the variable-diameter tube 20 gradually decreases in a direction away from the distal end 121. This gradual increase or decrease can uniformly change its diameter, ensuring the stability and effectiveness of the operation of the thrombus aspiration catheter 100 and reducing the damage to the blood vessel wall.

[0055] Specifically, the electro-stimulated activated polymer 23 will deform under the action of an electric field. When the variable-diameter tube 20 expands, the diameter of the variable-diameter tube 20 gradually increases in a direction away from the distal end 121, so that a larger thrombus area can be covered.

[0056] Conversely, when the direction of the electric field is reversed, the diameter of the variable-diameter tube 20 gradually decreases in a direction away from the distal end 121, which can reduce the friction and damage to the inner wall 21 of the blood vessel when the thrombus aspiration catheter 100 is withdrawn, ensuring that the thrombus aspiration catheter 100 can be smoothly removed from the blood vessel and facilitating the positioning and withdrawal of the thrombus aspiration catheter 100.

[0057] In addition, both the outer wall 22 and the inner wall 21 are insulating parts, which can prevent the electrolyte from eroding and extend the service life of the thrombus aspiration catheter 100.

[0058] Furthermore, the inner electrode piece 241, and / or the outer electrode piece 242, and / or the distal end 121 are all made of a radiopaque material.

[0059] The radiopaque material can be made of materials such as platinum, gold or tantalum, etc., which can be visualized under X-rays. Taking the inner electrode piece 241 and the outer electrode piece 242 as X-ray radiopaque materials as an example, it enables the variable-diameter tube 20 to be visualized under X-rays, facilitating doctors to observe the position and state of the thrombus aspiration catheter 100 in real time during the operation and ensuring the accuracy and safety of the operation.

[0060] It is convenient for doctors to observe the position and state of the thrombus aspiration catheter 100 in real time during the operation, further improving the effect and efficiency of thrombus aspiration.

[0061] The electro-stimulated activated polymer 23 is set as a composition made of one or more of the ionic electro-stimulated activated polymers 23;

[0062] Alternatively, the electro-stimulated activated polymer 23 is set as an electronic electro-stimulated activated polymer 23;

[0063] Alternatively, the electro-stimulated activated polymer 23 is set as an electrostrictive elastomer.

[0064] The ionic electro-stimulated activated polymer 23 can be IPMC materials such as Nafion (perfluorosulfonic acid, PSFA), Flemion (perfluorocarboxylic acid, PFCA), and Alciplex (perfluorocarboxylic acid, PFCA). These materials have good electrostrictive properties and are suitable for the design of the micro-sized thrombus aspiration catheter 100.

[0065] The electronic electro-stimulated activated polymer 23 can be ferroelectric polymer materials such as polyvinylidene fluoride (PVDF), vinylidene fluoride-trifluoroethylene copolymer (P(VDF-TrFE)), and polyurea. These materials have a high electrostrictive effect.

[0066] Electrostrictive elastomer materials such as silicone composites can provide a larger deformation range to meet different surgical requirements.

[0067] The selection of various electro-stimulated activated polymer 23 materials provides a larger design space and application flexibility, enabling the thrombus aspiration catheter 100 to adapt to different surgical requirements and operating environments, and further improving the effect and efficiency of thrombus aspiration.

[0068] Furthermore, the delivery tube 10 includes a support section 11 relatively close to the proximal end 111 and a transition section 12 relatively close to the distal end 121. The stiffness of the transition section 12 is less than that of the support section 11. The support section 11 is made of a high-stiffness material to provide the necessary pushing force and structural stability. The transition section 12 is made of a material with a lower stiffness to provide flexibility and compliance to ensure the smooth passage of the thrombus aspiration catheter 100 in complex vascular paths.

[0069] Specifically, the material of the support section 11 can be PA (polyamide, polyamide resin) or Pebax (polyether block polyamide) 7233, which can ensure good pushability at the proximal end 111 of the delivery tube 10. The material of the transition section 12 is Pebax6333, Pebax5533, Pebax4533, or Pebax4033, which can ensure good flexibility at the distal end 121 of the delivery tube 10. In addition, the transition section 12 can be one or more. Multiple transition sections 12 are connected end to end, and the hardness of multiple transition sections 12 gradually decreases from the proximal end 111 to the distal end 121 to achieve a better flexibility effect.

[0070] In addition, hydrophilic coatings are provided on the outer surfaces of both the transition section 12 and the diameter-changing tube 20. The hydrophilic coating can significantly reduce the frictional resistance of the thrombus aspiration catheter 100 within a blood vessel, improving the delivery efficiency and operational smoothness of the thrombus aspiration catheter 100. The hydrophilic coating material such as polyvinylpyrrolidone (PVP) is attached to the outer wall 22 of the transition section 12 and the outer wall 22 of the diameter-changing tube 20 near one end of the diameter-changing tube 20 by means of dip coating or brush coating. The length of the hydrophilic coating is 10 mm - 50 mm, which can form a lubricious surface in a water environment, further enhancing the performance of the thrombus aspiration catheter 100 during the surgical procedure.

[0071] As Figure 6 shown, both the inner electrode plate 241 and the outer electrode plate 242 are arranged around the axis of the diameter-changing tube 20. Also, the inner electrode plate 241 and the outer electrode plate 242 are arranged in the same shape.

[0072] The circumferential arrangement of the inner electrode plate 241 and the outer electrode plate 242 can ensure the uniform distribution of the electric field in the electro-stimulated activated polymer 23, thereby ensuring the uniform deformation of the diameter-changing tube 20 under the action of the electric field and improving the stability and consistency of the diameter-changing effect.

[0073] Among them, the shape of the electrode plate 24 can be one or a combination of shapes such as a hollow shape, a triangle, a square, a circle, other polygons, or an asymmetric serrated shape, etc.

[0074] Furthermore, as Figure 7 and 8 shown, both the inner electrode plate 241 and the outer electrode plate 242 are arranged in a serrated shape, the serrated peak portion 243 of the inner electrode plate 241 is aligned with the serrated valley portion 244 of the outer electrode plate 242, and the serrated valley portion 244 of the inner electrode plate 241 is aligned with the serrated peak portion 243 of the outer electrode plate 242. That is to say, although the inner electrode plate 241 and the outer electrode plate 242 are arranged in the same shape, they are arranged in a staggered manner.

[0075] The design of the serrated electrode plate 24 increases the contact area between the electrode plate 24 and the electro-stimulated activated polymer 23, enhances the effect of the electric field, and improves the deformation efficiency and response speed of the diameter-changing tube 20. It has good compliance, is conducive to deforming along with the deformation of the electro-stimulated activated polymer 23, reduces the deformation resistance of the metal electrode plate 24 to the electro-stimulated activated polymer 23, ensures both the conductive area and provides a deformation space for the deformation of the metal electrode plate 24 and adjacent components.

[0076] When the reducing pipe 20 expands, the serrated peak portions 243 of the serrated electrode sheets 24 can bulge outwards; when the reducing pipe 20 contracts, deformation spaces can be left between the serrated valley portions 244 between the serrated peak portions 243, ensuring uniform distribution of the electric field in the electro-stimulated active polymer 23, thereby ensuring uniform deformation of the reducing pipe 20 under the action of the electric field. The inner electrode sheet 241 and the outer electrode sheet 242 are arranged in a staggered manner, and the serrated valley portion 244 of the inner electrode sheet 241 leaves a space for the deformation of the serrated peak portion 243 of the outer electrode sheet 242, and the serrated valley portion 244 of the outer electrode sheet 242 leaves a space for the deformation of the serrated peak portion 243 of the inner electrode sheet 241.

[0077] In specific operations, the doctor first guides the thrombus aspiration catheter 100 to the location of the thrombus through a guide wire. During the guiding process, the reducing pipe 20 can be controlled to contract through the electric field control assembly 30. After confirming the position of the thrombus aspiration catheter 100, the electric field control assembly 30 switches the direction of the electric field to trigger the expansion of the reducing pipe 20. The expanded reducing pipe 20 can cover a larger range, facilitating the aspiration of more thrombi, and enabling them to be effectively aspirated into the thrombus aspiration catheter 100 under negative pressure. After the thrombus aspiration is completed, the direction of the electric field can be reversed again to make the reducing pipe 20 contract, facilitating the withdrawal of the thrombus aspiration catheter 100.

[0078] Compared with the prior art, the present embodiment has the following beneficial effects:

[0079] The thrombus aspiration catheter 100 realizes the expansion and contraction of the reducing pipe 20 through the electric field control assembly 30, and can adjust the diameter of the thrombus aspiration catheter 100 as needed. It can increase the diameter during thrombus aspiration to improve the aspiration range and efficiency, and can also reduce the diameter when the thrombus aspiration catheter 100 extends into the blood vessel, facilitating the transportation and positioning operations in the blood vessel. Moreover, compared with adjusting the diameter through gas in the background technology, the electric field change controlled by the electric field control assembly 30 responds more quickly, so that the reducing section can be adjusted to the required size more timely. The thrombus aspiration catheter 100 realizes flexible adjustment of the diameter of the thrombus aspiration catheter 100 on the premise of ensuring safety and operation convenience, and improves the efficiency and effect of thrombus aspiration.

[0080] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0081] The series of detailed descriptions listed above are only specific descriptions of the feasible implementation modes of the present utility model, and they are not intended to limit the protection scope of the present utility model. Any equivalent implementation modes or modifications made without departing from the technical spirit of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A thrombus aspiration catheter, characterized in that, It includes a delivery tube, a diameter-changing tube, and an electric field regulation component. The delivery tube includes a proximal end and a distal end along the direction of extending into the blood vessel. The proximal end is connected to an external suction device, and the distal end is connected to the diameter-changing tube. An electro-stimulated activated polymer and electrode plates are arranged in the diameter-changing tube. The electrode plates are electrically connected to the electric field regulation component, and the electric field regulation component is configured to regulate the electric field at the electrode plates to drive the electro-stimulated activated polymer to deform, so that the diameter-changing tube expands or contracts.

2. The thrombus aspiration catheter according to claim 1, wherein, The electrode plates include an outer electrode plate and an inner electrode plate. The diameter-changing tube includes an outer wall, the outer electrode plate, the electro-stimulated activated polymer, the inner electrode plate, and an inner wall arranged in sequence from outside to inside along the thickness direction of the tube wall; When the outer electrode plate is connected to the positive electrode and the inner electrode plate is connected to the negative electrode, the diameter-changing tube expands, and the diameter of at least part of the diameter-changing tube increases; When the inner electrode plate is connected to the positive electrode and the outer electrode plate is connected to the negative electrode, the diameter-changing tube contracts, and the diameter of at least part of the diameter-changing tube decreases.

3. The thrombus aspiration catheter according to claim 2, wherein, When the diameter-changing tube expands, the diameter of the diameter-changing tube gradually increases in the direction away from the distal end; When the diameter-changing tube contracts, the diameter of the diameter-changing tube gradually decreases in the direction away from the distal end.

4. The thrombus aspiration catheter according to claim 2, wherein, A first wire and a second wire are arranged in the delivery tube. The outer electrode plate is electrically connected to the electric field regulation component through the first wire, and the inner electrode plate is electrically connected to the electric field regulation component through the second wire; Insulating members are coated on the outer sides of the first wire and the second wire.

5. The thrombus aspiration catheter according to claim 2, wherein Both the inner electrode plate and the outer electrode plate are arranged around the axis of the diameter-changing tube; The inner electrode plate and the outer electrode plate are set to have the same shape.

6. The thrombus aspiration catheter according to claim 5, wherein Both the inner electrode plate and the outer electrode plate are set to be hollow-shaped, triangular, square, circular, polygonal, or serrated; When both the inner electrode plate and the outer electrode plate are set to be serrated, the serrated peak parts of the inner electrode plate are aligned with the serrated valley parts of the outer electrode plate, and the serrated valley parts of the inner electrode plate are aligned with the serrated peak parts of the outer electrode plate.

7. The thrombus aspiration catheter according to claim 2, wherein Both the outer wall and the inner wall are made of insulating parts.

8. The thrombus aspiration catheter according to claim 2, wherein The inner electrode plate, and / or the outer electrode plate, and / or the distal end are made of a radiopaque material; 9. The thrombus aspiration catheter according to claim 1, wherein, The electro-stimulated activated polymer is set to be a component made of one or more of ionic electro-stimulated activated polymers with ion exchange ability; Alternatively, the electro-stimulated activated polymer is set to be an electronic electro-stimulated activated polymer component; Alternatively, the electro-stimulated activated polymer is set to be an electrostrictive elastomer.

10. The thrombus aspiration catheter according to claim 1, characterized in that, The delivery tube includes a support section relatively close to the proximal end and a transition section relatively close to the distal end. The stiffness of the transition section is less than that of the support section; Hydrophilic coatings are provided on the outer surfaces of the transition section and the diameter-changing tube.

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