An arteriovenous fistula device

Abstract

The application provides an arteriovenous fistula device, and relates to the technical field of medical devices.The arteriovenous fistula device comprises a handle, a sliding assembly, an elastic pressure assembly, a stroke detection assembly, a first pipe body and a second pipe body; and a sliding button is arranged on the outer wall of the handle.The sliding button drives the sliding assembly to move, and the opening and closing of the proximal electrode sheet and the distal electrode sheet on the first pipe body are realized.When it is detected that the two electrodes have been closed, energy is excited in front of the two electrode sheets to form an arteriovenous fistula, and the operation is simple and convenient; and the elastic pressure assembly can ensure that there is a minimum closing force when the proximal electrode sheet and the distal electrode sheet are closed, so that the two electrode sheets are prevented from being opened due to the hand being loosened during the closing process.The application overcomes the defects in the prior art, is more beneficial to the operation of doctors in clinical use, and can obtain a better fistula effect.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an arteriovenous fistula device. Background Technology

[0002] Arteriovenous fistula (AVC) is a surgical procedure that creates an arteriovenous fistula within the ventricle of the blood vessel, establishing a blood supply. By avoiding traditional open surgery, AVC reduces vascular trauma, decreases bleeding, minimizes intimal hyperplasia, and lowers postoperative morbidity.

[0003] Current techniques often involve using an arteriovenous anastomosis catheter under ultrasound guidance to puncture the vein and the adjacent radial artery. After successful puncture, the catheter tip is inserted into the radial artery through a communicating vein. A certain tension is applied to the catheter to ensure that the tip can fit tightly against the arterial wall. The catheter tip is then closed and low-power electrothermal energy is applied to connect the arteriovenous walls, thereby forming an arteriovenous fistula.

[0004] However, existing arteriovenous fistula devices have at least the following technical shortcomings:

[0005] (1) The opening and closing structure of the anastomotic catheter tip is complex, and the opening and closing operation is very inconvenient.

[0006] (2) It is impossible to accurately detect whether the opening and closing structure at the tip of the anastomosis catheter is completely closed. If it is not completely closed, it is impossible to effectively form an endovascular fistula.

[0007] (3) After the anastomosis catheter tip is closed, it is easy to loosen naturally if the external force is removed, and it cannot effectively form an endovascular fistula. If external force is always applied, it is not convenient for doctors to operate.

[0008] (4) The opening and closing structure at the tip of the catheter is prone to getting stuck in human tissue and sheath, which is not conducive to the delivery and retrieval of the anastomosis catheter in the sheath.

[0009] (5) The opening and closing structure of the catheter tip is prone to rotational misalignment during operation, which is not conducive to accurate closure of the catheter tip, nor to the delivery and retrieval of the anastomotic catheter.

[0010] (7) Doctors can only determine whether the catheter tip has accurately captured the arterial and venous walls by ultrasound or X-ray angiography, but this method is less accurate, complicated to operate, and requires a high level of experience from doctors.

[0011] (8) The tip of the anastomotic catheter made of special material has poor imaging effect, which is not conducive to doctors judging the condition of the anastomotic catheter by ultrasound or CT imaging.

[0012] Due to the aforementioned shortcomings, existing arteriovenous fistula devices are not effective in clinical use. Doctors often cause medical accidents due to various operational problems, which limits the use and popularization of arteriovenous fistula surgery in clinical practice. Summary of the Invention

[0013] The purpose of this invention is to provide an arteriovenous fistula device to solve at least one of the above-mentioned technical problems.

[0014] To address the aforementioned problems, the present invention first provides an arteriovenous fistula device, comprising a handle, a sliding assembly, an elastic pressure assembly, a stroke detection assembly, a first tube, and a second tube; a sliding button is mounted on the outer side wall of the handle; the sliding assembly is slidably installed within the handle and configured to slide between an open position and a closed position under the action of the sliding button; the elastic pressure assembly is connected to the inner wall of the handle and the sliding assembly respectively, and is configured to apply a preload force to the sliding assembly in the direction from the open position to the closed position; the stroke detection assembly is located within the handle and connected to the sliding assembly, and is configured to detect the sliding stroke of the sliding assembly; one end of the first tube is located within the handle, and the other end is located outside the handle and connected to a base. The base has a first inclined surface on which a proximal electrode plate is mounted. A second tube is inserted into the first tube, with its distal end located outside the first tube and connected to a head end. The head end has a second inclined surface facing the first inclined surface, on which a distal electrode plate is mounted. The height of the proximal surface of the head end is lower than the height of the proximal surface of the base, and the two are at a preset distance. A limiting structure restricting relative rotation between the second tube and the base is provided, and an assembly positioning structure is provided between the second tube and the head end. The first tube or the second tube is connected to a sliding assembly, which slides from the open position to the closed position, driving the spaced proximal and distal electrode plates to a fitted state.

[0015] Using the above technical solution, the sliding component is moved by the sliding button to open and close the proximal and distal electrode plates on the first tube. When the closure of the two electrodes is detected, energy is generated in front of the two electrode plates to create a fistula in the artery and vein. The operation is simple and convenient. Moreover, the use of the elastic pressure component can ensure that there is a minimum closing force when the proximal and distal electrode plates are closed, preventing the two electrode plates from opening due to the release of the hand during the closing process. In addition, the structure of the first and second tubes has been improved to avoid jamming and rotational misalignment.

[0016] Furthermore, the sliding assembly includes a slider and an elastic positioning element; the slider is connected to the elastic pressure assembly and the stroke detection assembly respectively, the first tube or the second tube is connected to the slider, and the outer wall of the slider is provided with a first positioning part and a second positioning part; the elastic positioning element is installed on the inner wall of the handle and is configured to be able to position and cooperate with the first positioning part and the second positioning part.

[0017] By adopting the above technical solution, the travel limit of the slider is achieved by using the elastic positioning component. The elastic positioning component can generate a certain sound and feedback in both the first and second positioning parts. It is not only simple in structure, but also easy to process, assemble and operate by users.

[0018] Furthermore, the elastic pressure assembly includes a mounting base and an elastic element. The mounting base is fixedly connected to the inner wall of the handle. One end of the elastic element is connected to the mounting base, and the other end is connected to the sliding assembly. When the sliding assembly is in the range from the open position to the closed position, the elastic element undergoes elastic deformation and has an elastic force in the direction from the open position to the closed position.

[0019] By applying prestress to the elastic element when it is in the open position, the elastic element deforms. When switching from the open position to the closed position, the elastic element still maintains its deformed state, thereby providing pre-tightening force for the sliding assembly. This not only facilitates user operation but also prevents the two closed electrode plates from opening again.

[0020] Furthermore, when the sliding assembly includes a slider and an elastic positioning member, the mounting base is adjacent to the elastic positioning member, and the elastic member is located between the fixed base and the elastic positioning member.

[0021] By adopting the above technical solution, the elastic component is placed on one side of the elastic positioning part, making assembly simpler.

[0022] Furthermore, the stroke detection component includes a detection circuit board, conductive strips, and a spring pin; the detection circuit board is installed inside the handle and has a detection area; multiple conductive strips are evenly spaced along a preset direction of the detection area, each conductive strip has the same resistance and is connected to the detection circuit board; one end of the spring pin is installed on the sliding component and slides with the sliding component, and the other end has a pointed tip that abuts against the conductive strip.

[0023] Using the above technical solution, the detection circuit board determines the travel of the sliding button and the sliding component through the conductive cooperation of the spring pin and a certain conductive strip. After proportional conversion, the relative position of the distal electrode plate can be detected. The structure is simple and the detection is accurate.

[0024] Furthermore, the sliding button, the sliding component, and the detection circuit board are at least partially located on the same horizontal plane.

[0025] With the above technical solution, it is easier to replace the detection circuit board when the sliding button, sliding component and detection circuit board are on the same horizontal plane.

[0026] Furthermore, the limiting structure includes a first radial limiting portion disposed on the outer wall of the second tube and a second radial limiting portion disposed on the inner wall of the base. The first radial limiting portion is one of a recess and a protrusion, and the second radial limiting portion is the other of a recess and a protrusion.

[0027] The above technical solution utilizes recesses and protrusions to limit the positioning of the second tube and the base, resulting in a simple structure that effectively prevents rotational misalignment of the second tube.

[0028] Furthermore, the assembly positioning structure includes a third positioning part disposed on the second tube body and a fourth positioning part disposed on the inner wall of the head end. The third positioning part is one of a positioning boss and a positioning groove, and the fourth positioning part is the other of a positioning boss and a positioning groove.

[0029] The above technical solution utilizes the cooperation of the positioning boss and the positioning groove to achieve the assembly and positioning of the second tube body and the head end. The structure is simple and easy to implement.

[0030] Furthermore, the first tube body and the head end are provided with sensors for detecting blood flow or pressure.

[0031] Using the above technical solution, sensors are used to detect the blood flow or pressure in arteries and veins, thereby determining whether the two electrode pads have successfully captured the arterial and venous vessel walls during interventional surgery.

[0032] Furthermore, the head end and the base are filled with microbubbles, and the outer surfaces of the head end and the base are provided with dotted pits.

[0033] By adopting the above technical solution, the acoustic impedance of the head end and the base is reduced by microbubbles, thereby increasing the ultrasound reflection intensity. At the same time, dot-shaped pits are used to increase the imaging of the head end and the base under ultrasound.

[0034] In summary, the arteriovenous fistula device provided by this invention overcomes the shortcomings of the prior art, is easier for doctors to operate in clinical use, and can achieve better fistula results. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of an arteriovenous fistula device provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of another arteriovenous fistula device provided in an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of the internal structure of the first arteriovenous fistula device provided in the embodiments of the present invention (I);

[0039] Figure 4 A schematic diagram (II) of the internal structure of the first arteriovenous fistula device provided in the embodiments of the present invention;

[0040] Figure 5 A schematic diagram (I) of the internal structure of the second type of arteriovenous fistula device provided in an embodiment of the present invention;

[0041] Figure 6 A schematic diagram (II) of the internal structure of the second type of arteriovenous fistula device provided in an embodiment of the present invention;

[0042] Figure 7 A schematic diagram of the internal structure of the third type of arteriovenous fistula device provided in the embodiments of the present invention (I);

[0043] Figure 8 A schematic diagram (II) of the internal structure of the third type of arteriovenous fistula device provided in the embodiments of the present invention;

[0044] Figure 9 A schematic diagram of the internal structure of the fourth type of arteriovenous fistula device provided in the embodiments of the present invention (I);

[0045] Figure 10 A schematic diagram (II) of the internal structure of the fourth type of arteriovenous fistula device provided in the embodiments of the present invention;

[0046] Figure 11 This is a schematic diagram showing the layout of the stroke detection component of the arteriovenous fistula device provided in an embodiment of the present invention within the handle;

[0047] Figure 12 This is a schematic diagram of the travel detection component of the arteriovenous fistula device provided in an embodiment of the present invention;

[0048] Figure 13 This is a schematic diagram of the structure of the catheter of the arteriovenous fistula device provided in the embodiment of the present invention when the two electrode pads are in the open position;

[0049] Figure 14 This is a schematic diagram of the structure of the catheter of the arteriovenous fistula device provided in the embodiment of the present invention when the two electrode pads are in the closed position;

[0050] Figure 15 This is a schematic diagram of a limiting structure of an arteriovenous fistula device provided in an embodiment of the present invention;

[0051] Figure 16 This is a schematic diagram of another limiting structure of the arteriovenous fistula device provided in an embodiment of the present invention;

[0052] Figure 17 This is a schematic diagram of the assembly and positioning structure of the arteriovenous fistula device provided in an embodiment of the present invention;

[0053] Figure 18 This is a schematic diagram of the proximal electrode plate of the arteriovenous fistula device provided in an embodiment of the present invention;

[0054] Figure 19 This is a schematic diagram of the structure of the catheter of the arteriovenous fistula device provided in an embodiment of the present invention when a sensor is provided;

[0055] Figure 20 A schematic diagram of the structure of the arteriovenous fistula device provided in the embodiment of the present invention, wherein a heating element is provided inside the base.

[0056] Explanation of reference numerals in the attached figures:

[0057] 100 - Handle; 110 - Slide button; 120 - Cable;

[0058] 200 - Sliding assembly; 210 - Slider; 211 - First positioning part; 212 - Second positioning part; 220 - Elastic positioning element;

[0059] 300 - Flexible pressure assembly; 310 - Mounting base; 320 - Elastic element; 330 - Gasket; 340 - Nut;

[0060] 400 - Stroke detection component; 410 - Detection circuit board; 420 - Conductive strip; 430 - Spring pin; 431 - Tip;

[0061] 500 - First tube body; 510 - Base; 511 - First inclined surface; 512 - Second radial limiting part; 513 - Heating element; 520 - Proximal electrode plate;

[0062] 600-Second tube body; 610-Head end; 611-Second inclined surface; 612-Fourth positioning part; 620-Distal electrode plate; 621-Boss; 630-First radial limiting part; 640-Third positioning part;

[0063] 700-Sensor. Detailed Implementation

[0064] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0065] This embodiment provides a novel arteriovenous fistula device.

[0066] Combined with appendix Figure 1 Appendix Figure 2 and attached Figure 3 As shown, the arteriovenous fistula device provided in this embodiment includes functional components such as a handle 100, a sliding component 200, an elastic pressure component 300, a stroke detection component 400, a first tube 500, and a second tube 600. Since the structural improvements of the arteriovenous fistula device in this embodiment are only in the aforementioned functional components, this embodiment does not describe the remaining structures of the arteriovenous fistula device, such as the control component. Those skilled in the art can refer to existing control component structures. In this embodiment, a sliding button 110 is mounted on the outer side wall of the handle 100, and a cable 120 is provided inside the handle 100. The cable 120 is used to connect the control component and the power supply, etc. The mounting position of the sliding button 110 can be... Figure 1 On the wider sidewalls, it is also possible to... Figure 2 As shown, it is mounted on a narrower side wall, and the sliding button 110 can slide on the side wall of the handle 100.

[0067] In this embodiment, the sliding component 200 is slidably installed inside the handle 100. The sliding component 200 is connected to the sliding button 110. The connection method can be a fixed connection or a detachable connection. The sliding component 200 is configured to slide between an open position and a closed position under the action of the sliding button 110. When in the open position, the proximal electrode plate and the distal electrode plate 620 are separated. When in the closed position, the proximal electrode plate and the distal electrode plate 620 are in contact.

[0068] In this embodiment, the elastic pressure assembly 300 is connected to the inner wall of the handle 100 and the sliding assembly 200, and is configured to apply a preload force to the sliding assembly 200 in the direction from the open position to the closed position. In this embodiment, the stroke detection assembly 400 is located inside the handle 100 and connected to the sliding assembly 200, and is configured to detect the sliding stroke of the sliding assembly 200. Its specific structure is given below. The conduit in this embodiment includes a first tube body 500 and a second tube body 600. One end of the first tube body 500 is located inside the handle 100, and the other end is located outside the handle 100 and connected to a base. The base has a first inclined surface, and a proximal electrode plate is mounted on the first inclined surface.

[0069] In this embodiment, the first tube 500 is a high-temperature resistant polymer tube, such as polyimide, polyetheretherketone, and silicone rubber. A printed marking strip indicates the sheath's withdrawal position during surgery. The first tube 500 is fixed to the base by adhesive bonding. The distance between the two electrode pads can be changed by pushing or pulling the first tube 500 and fixing the position of the second tube 600. The second tube 600 is made of nickel-titanium alloy or 316 stainless steel and is fixed to the tip 610 and the distal electrode pad 620 as a single unit by adhesive bonding or welding. The second tube 600, the proximal electrode pad, and the base all have a clearance fit, allowing relative movement. Pushing or pulling the tube and fixing the base position changes the distance between the two electrode pads. The inner hole of the second tube 600 can accommodate a guidewire for catheter insertion to a designated position during surgery.

[0070] In this embodiment, the radial dimension of the second tube 600 is smaller than that of the first tube 500. Therefore, the second tube 600 is inserted into the first tube 500, with its distal end located outside the first tube 500 and connected to a head end 610. The head end 610 has a second inclined surface 611 facing the first inclined surface. A distal electrode plate 620 is installed on the second inclined surface 611. The height of the proximal surface of the head end 610 is lower than the height of the proximal surface of the base, and the two are at a preset distance. This preset distance creates a certain height difference between the head end 610 and the base, preventing the catheter from getting stuck in human tissue or the sheath. A limiting structure is provided between the second tube 600 and the base to restrict their relative rotation, effectively preventing rotational misalignment between the second tube 600 and the base. In addition, an assembly positioning structure is provided between the second tube 600 and the head end 610 to facilitate the connection and positioning between the second tube 600 and the head end 610.

[0071] Combined with appendix Figure 3 and attached Figure 4As shown, the sliding assembly 200 of this embodiment includes a slider 210 and an elastic positioning member 220. The slider 210 is connected to the elastic pressure assembly 300 and the stroke detection assembly 400 respectively. The first tube 500 passes through the slider 210 and is connected to the slider 210. The outer wall of the slider 210 is provided with a first positioning part 211 and a second positioning part 212. The elastic positioning member 220 is installed on the inner wall of the handle 100 and is configured to be able to position and cooperate with the first positioning part 211 and the second positioning part 212. Accordingly, the first positioning part 211 of this embodiment is a positioning groove adapted to the positioning bead, and the second positioning part 212 is a long strip positioning groove. The long strip positioning groove allows the elastic positioning member 220 to still generate a sliding tendency to make the two electrode plates stick together under the preload of the spring when the slider 210 slides to the closed position, thereby ensuring that a more stable minimum closing force can be provided.

[0072] Specifically, in this embodiment, the elastic positioning element 220 is a positioning bead. The positioning bead contains an elastic element (specific structure not shown in the figure), and its bottom has a small ball that can be pressed down and rebound. When the small ball is subjected to a certain pressure, it is pressed into the positioning bead; when the pressure on the small ball is too small, it resets. Therefore, when the user pushes the sliding button 110, it causes the slider to move... Figure 3 When moving to the left, you can feel the rebound pressure feedback from the elastic positioning element 220.

[0073] In this way, when the sliding button 110 is pushed, the slider 210 slides to the left, and the proximal electrode moves to the distal electrode until it is closed. The button can no longer move forward. At this time, the small ball at the top of the positioning bead is instantly stuck into the long strip positioning groove and makes a "click" impact sound. That is, the elastic positioning element 220 is used to limit the stroke of the slider 210. The elastic positioning element 220 can produce a certain sound and feedback in both the first positioning part 211 and the second positioning part 212. It is not only simple in structure, but also easy to process, assemble and operate by the user.

[0074] There can be various specific structural forms for the elastic pressure assembly 300, such as combining it with... Figure 3 and attached Figure 4 As shown, in this embodiment, the elastic pressure assembly 300 and the sliding assembly 200 are coaxially arranged. The assembly may include a mounting base 310, an elastic element 320, two washers 330, and a nut 340. The mounting base 310 is disposed on the inner wall of the arm. One end of the spring near the sliding assembly 200 is connected to the mounting base 310 via a washer 330. The connection between the spring and the washer 330 on the right side of the figure can be either abutment or fixed connection. The other end of the spring is connected to the first tube 500 via another washer 330 and a nut 340. The left end of the slider 210 passes through the spring and is connected to the nut 340. Figure 3 and Figure 4When the sliding component 200 is in a compressed state, it can move from the open position to the closed position when it moves to the left. This causes the end of the first tube 500 with the proximal electrode plate to move towards the distal electrode plate 620, thus achieving docking of the proximal electrode plate and the distal electrode plate 620, thereby completing the clamping of the artery and vein. When the device detects that the two electrodes are closed, it excites energy in front of the two electrodes to create a fistula in the artery and vein.

[0075] During the above process, since the spring is compressed in the open position, it provides a certain elastic restoring force to the sliding assembly 200. In the closed state, this elastic restoring force is only partially weakened, but it still ensures a minimum closing force when the proximal and distal electrode plates 620 are closed, preventing the two electrodes from opening due to the user releasing their hand during the closing process. In this way, by applying prestress to the elastic element 320 in the open position, the elastic element 320 deforms. When switching from the open to the closed position, the elastic element 320 maintains this deformation, thus providing a preload force to the sliding assembly 200. This not only facilitates user operation but also prevents the closed electrode plates from opening again.

[0076] Combined with the appendix Figure 5 and attached Figure 6 As shown (the slider 210 in the figure is still in the open position, that is, the two electrode plates are not in contact), the position of the elastic pressure component 300 can also be adjusted. For example, the mounting base 310 can be set to be adjacent to the elastic positioning member 220, but not coaxial with the sliding component 200. At this time, the spring is located between the mounting base 310 and the elastic positioning member 220. One end of the spring is fixedly connected to the mounting base 310, the mounting base 310 is fixedly connected to the inner wall of the handle 100, and the other end of the spring is fixedly connected to the slider. The assembly is simpler. At this time, the spring is also in a compressed state and provides preload from the open position to the closed position.

[0077] Combined with appendix Figure 7 and attached Figure 8 As shown, in addition to connecting the first tube 500 to the sliding assembly 200 as described above, the second tube 600 can also be connected to the sliding assembly 200. In this case, the sliding button 110 drives the sliding assembly 200 to move in the same direction as... Figure 3-6 The movement direction is opposite. At this time, it is necessary to drive the second tube 600 with the distal electrode plate 620 to move towards the proximal electrode plate, and adjust the position of the mounting base 310. Set the mounting base 310 to the left of the spring and connect the right side of the spring to the slider 210. At this time, the spring is also in a compressed state, so that when the sliding component 200 moves from the open position to the closed position, the spring can provide a certain preload or minimum closing force.

[0078] In addition, the position of the elastic pressure component 300 can be changed according to design requirements, for example, by combining it with the attached... Figure 9 and attached Figure 10 As shown, unlike the structure described above, the mounting base 310 and spring can also be located at the end of the slider 210 near the cable 120, instead of as described above. Figure 3-8 The mounting base 310 and spring are shown positioned at the end of the slider 210 away from the cable 120. Furthermore, the sliding button 110, sliding assembly 200, and detection circuit board 410 can be at least partially on the same horizontal plane, making it easier to replace the detection circuit board 410.

[0079] Combined with appendix Figure 11 and attached Figure 12 As shown, the stroke detection component 400 of this embodiment includes a detection circuit board 410, conductive strips 420, and a spring pin 430. The detection circuit board 410 is installed inside the handle 100 and connected to the control component of the device via a cable 120, and has a detection area. Multiple conductive strips 420 are evenly spaced along a preset direction of the detection area. Each conductive strip 420 has the same resistance and is connected to the detection circuit board 410. Specifically, the conductive strips 420 can be considered as part of the circuit board, and the two are integrally formed. One end of the spring pin 430 is installed on the sliding component 200 and slides with it. The other end has a pointed tip 431 that abuts against the conductive strip 420. When the sliding button 11 is pushed... At time 0, the spring needle 430 moves along with the slider 210. Therefore, the tip 431 of the spring needle 430 slides on the conductive strip 420 on the circuit board. There is also a cable 120 connecting the spring needle 430 and the detection circuit board 410 for the transmission of electrical signals. Thus, the spring needle 430, through the linkage between the button and the slider 210, allows the device to detect the movement stroke / displacement of the button, and then detect the relative distance between the distal and proximal electrodes. Assume that the movable range of the button is exactly the same as the relative distance between the two electrodes. The specific values ​​of A and B are designed according to specific requirements. The two have a proportional correspondence and can be equal. By detecting the movable range of the button, the relative distance between the distal and proximal electrodes can be obtained. The structure is simple and the detection is accurate.

[0080] Combined with appendix Figure 13 and attached Figure 14 As shown, the distal end of the arteriovenous fistula device in this embodiment is the end of the first tube 500 and the second tube 600. The inclined surface of the first tube 500 is equipped with a proximal electrode plate, and the inclined surface of the second tube 600 is equipped with a distal electrode plate 620. In order to improve structural stability, this embodiment provides a limiting structure between the second tube 600 and the bottom wall.

[0081] Combined with appendix Figure 15As shown, the limiting structure of this embodiment includes a first radial limiting portion 630 disposed on the outer wall of the second tube 600 and a second radial limiting portion 512 disposed on the inner wall of the base. The first radial limiting portion 630 is one of a recess and a protrusion, and the second radial limiting portion 512 is the other of a recess and a protrusion. (See attached diagram.) Figure 16 As shown, the first radial limiting part 630 in this embodiment can also be two matching limiting platforms, which can be formed by cutting the second tube 600 and the base. In this way, the limiting of the second tube 600 and the base is achieved by using structures such as recesses and protrusions. The structure is simple and can effectively prevent the second tube 600 from rotating and misaligning.

[0082] Combined with appendix Figure 17 As shown, the assembly positioning structure of this embodiment includes a third positioning part 640 disposed on the second tube body 600 and a fourth positioning part 612 disposed on the inner wall of the head end 610. Specifically, the third positioning part 640 is one of a positioning boss and a positioning groove, and the fourth positioning part 612 is the other of a positioning boss and a positioning groove. During assembly, the positioning boss and the positioning groove are matched before subsequent installation, which facilitates the assembly positioning of the second tube body 600 and the head end 610. The structure is simple and easy to implement.

[0083] Combined with appendix Figure 18 As shown, a boss 621 can also be provided on the inclined surface of the distal electrode 620 facing the head end 610. The boss 621 facilitates the laser welding of the distal electrode 620 and the inclined surface of the head end 610. Laser continuous welding or spot welding can be performed to prevent the head end 610 from falling off when compressing blood vessels and improve product reliability.

[0084] Combined with appendix Figure 19 As shown, the first tube body 500 and the head end 610 are respectively equipped with sensors 700 for detecting blood flow or pressure. The sensors 700 are used to detect the blood flow or pressure in the arteries and veins, thereby determining whether the two electrode pads have successfully captured the arterial and venous vessel walls during the interventional procedure.

[0085] More preferably, in this embodiment, the tip 610 and the base are filled with microbubbles (not shown in the figure), and dotted pits (not shown in the figure) are provided on the outer surface of the tip 610 and the base. The microbubbles reduce the acoustic impedance of the tip 610 and the base, thereby increasing the ultrasonic reflection intensity. The dotted pits increase the imaging of the tip 610 and the base under ultrasound. In addition, to increase the acoustic impedance of the material itself, barium sulfate, tungsten, or other high acoustic impedance particles can be doped into the polymer material of the tip 610 and the base to increase the ultrasonic reflection intensity. Alternatively, an imaging metal braided layer can be placed in the inner hole of the catheter tip 610 and the inner hole of the base. The material can be stainless steel, nickel-titanium alloy, or platinum-iridium alloy. In addition, the roughness of the outer surface of the tip 610 and the base can be increased to increase ultrasonic reflection in all directions.

[0086] Combined with appendix Figure 20 As shown, the base of this embodiment is equipped with a heating element 513 and a thermocouple. The heating element 513 is made of a high-resistivity metal, laser-cut from a 0.05-0.2mm thin metal sheet, and then coated with an insulating layer with a thickness of 1-10 micrometers. When current passes through the heating element 513, heat is generated and transferred to the electrode plates via thermally conductive adhesive, acting on the walls of arteries and veins. Specifically, the heating element 513 is an elliptical, hollow, filament-like structure with repeated bends. The major and minor axes of its outer ellipse are slightly smaller than the groove structure of the base. The hollow elliptical structure allows the second tube 600 to pass through smoothly. The width of the single filament ranges from 0.02-0.05mm. The heating element 513 has wires exiting from one side, which can be led out from one hole in the base. The other hole in the base can be used to lead out the thermocouple wires. The thermocouple is used to detect the temperature of the proximal electrode plate being heated.

[0087] The above description is merely a preferred embodiment of the present invention. Those skilled in the art should understand that the scope of disclosure involved in the present invention is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the present invention.

Claims

1. An arteriovenous fistula device, comprising: include: The handle (100) has a sliding button (110) mounted on its side wall. A sliding assembly (200) is slidably mounted within the handle (100) and configured to slide between an open position and a closed position under the action of the sliding button (110); the sliding assembly (200) includes a slider (210) and an elastic positioning member (220); the outer wall of the slider (210) is provided with a first positioning part (211) and a second positioning part (212); the elastic positioning member (220) is mounted on the inner wall of the handle (100) and configured to be able to position and cooperate with the first positioning part (211) and the second positioning part (212); An elastic pressure assembly (300) is connected to the inner wall of the handle (100) and the sliding assembly (200) respectively, and is configured to apply a preload force to the sliding assembly (200) in the direction from the open position to the closed position; the elastic pressure assembly (300) includes a mounting base (310) and an elastic element (320), the mounting base (310) is fixedly connected to the inner wall of the handle (100), one end of the elastic element (320) is connected to the mounting base (310), and the other end is connected to the sliding assembly (200). When the sliding assembly (200) is between the open position and the closed position, the elastic element (320) is compressed and has an elastic force in the direction from the open position to the closed position; the mounting base (310) is adjacent to the elastic positioning element (220), and the elastic element (320) is located between the mounting base (310) and the elastic positioning element (220); A stroke detection component (400) is located within the handle (100) and connected to the sliding component (200), and is configured to detect the sliding stroke of the sliding component (200); The first tube (500) has one end located inside the handle (100) and the other end located outside the handle (100) and connected to a base (510). The base (510) has a first inclined surface (511) and a proximal electrode plate (520) is installed on the first inclined surface (511). And a second tube (600) is inserted inside the first tube (500), with its distal end located outside the first tube (500) and connected to a head end (610). The head end (610) has a second inclined surface (611) facing the first inclined surface (511). A distal electrode plate (620) is installed on the second inclined surface (611). The height of the proximal surface of the head end (610) is lower than the height of the proximal surface of the base (510) and the two are at a preset distance. A limiting structure is provided between the second tube (600) and the base (510) to restrict their relative rotation. An assembly positioning structure is provided between the second tube (600) and the head end (610). The first tube (500) or the second tube (600) is connected to the sliding assembly (200). The sliding assembly (200) slides from the open position to the closed position, driving the spaced proximal electrode sheet (520) and the distal electrode sheet (620) to a mating state. The slider (210) is connected to the elastic pressure assembly (300) and the stroke detection assembly (400) respectively, and the first tube (500) or the second tube (600) is connected to the slider (210).

2. The arteriovenous fistula device of claim 1, wherein, The travel detection component (400) includes a detection circuit board (410), conductive strips (420), and a spring pin (430); the detection circuit board (410) is installed inside the handle (100) and has a detection area; a plurality of conductive strips (420) are evenly spaced along a preset direction of the detection area, and each conductive strip (420) has the same resistance and is connected to the detection circuit board (410); one end of the spring pin (430) is installed on the sliding component (200) and slides with the sliding component (200), and the other end has a tip (431) that abuts against the conductive strip (420).

3. The arteriovenous fistula device of claim 2, wherein, The sliding button (110), the sliding component (200), and the detection circuit board (410) are at least partially located on the same horizontal plane.

4. The arteriovenous fistula device of claim 1, wherein, The limiting structure includes a first radial limiting part (631) disposed on the outer wall of the second tube (600) and a second radial limiting part (512) disposed on the inner wall of the base (510). The first radial limiting part (631) is one of a recess and a protrusion, and the second radial limiting part (512) is the other of a recess and a protrusion.

5. The arteriovenous fistula device according to claim 1, characterized in that, The assembly positioning structure includes a third positioning part (640) disposed on the second tube body (600) and a fourth positioning part (612) disposed on the inner wall of the head end (610). The third positioning part (640) is one of a positioning boss (621) and a positioning groove, and the fourth positioning part (612) is the other of a positioning boss (621) and a positioning groove.

6. The arteriovenous fistula device of claim 1, wherein, The first tube body (500) and the head end (610) are respectively provided with sensors (700) for detecting blood flow or pressure.

7. The arteriovenous fistula device of claim 1, wherein, The head end (610) and the base (510) are filled with microbubbles, and the outer surfaces of the head end (610) and the base (510) are provided with dotted pits.

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