A radiofrequency plasma endovenous occlusion catheter

Abstract

The present invention discloses a radiofrequency plasma endovenous occlusion catheter, which relates to the technical field of medical devices. In order to solve the problem that the existing ablation catheter occasionally causes tissue and blood in the blood vessel to carbonize and crust and adhere to the working section of the heating wire, affecting the ablation and occlusion effect, the following technical solutions are proposed: It includes a catheter front end, a nozzle, a handle assembly and a cable assembly; the catheter is connected to the handle assembly through the nozzle, and the cable assembly is arranged at the rear end of the handle assembly; the catheter includes a treatment section and an insertion section. A plasma working electrode is arranged outside the treatment section, and a radiofrequency heating coil is arranged inside. The treatment section and the insertion section are guided by a guide wire into the lower limb vein blood vessel to be occluded. The handle assembly controls the plasma working electrode to strip the tissue adhered to the radiofrequency heating coil, and the plasma working electrode performs low-temperature heating ablation on the tissue and the radiofrequency heating coil. The present invention can better perform the ablation and occlusion of subsequent blood vessels, save the operation time and improve the operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to an intravascular radiofrequency plasma closure catheter for veins. Background Art

[0002] Veins are the blood vessels that return blood to the heart. Varicose veins refer to the tortuosity and dilation of veins caused by factors such as blood stasis and weak vein walls, indicating that there are problems in the process of venous blood return. The main treatment methods for varicose veins include laser, radiofrequency, microwave, and electrocoagulation methods. Compared with the early stripping method, these surgical methods have less surgical trauma, fewer complications, and faster postoperative recovery. In addition, there is currently a surgical method for treating varicose veins by injecting sclerosing agents into the target blood vessels. Among the mainstream treatment methods, the safety and reliability of thermal ablation closure by radiofrequency method are gradually accepted by hospitals and patients.

[0003] For example, a radiofrequency ablation device and a radiofrequency ablation catheter disclosed in Chinese Patent No. CN118078418A. However, when using this ablation catheter, tissue and blood in the blood vessel may occasionally carbonize and crust and adhere to the working section of the heating wire, thus affecting the ablation closure effect. For this reason, medical staff may need to pull out the ablation catheter, remove and clean the tissue adhering to the vicinity of the working end of the ablation catheter and then continue the operation, which greatly reduces the surgical efficiency, increases the operation time, and the blood vessel gap (i.e., the working channel) occupied by the working section during the process of closing and withdrawing from the blood vessel cannot be well closed, and the closure effect of the venous blood vessel still needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide an intravascular radiofrequency plasma closure catheter for veins to solve the problem that the existing ablation catheter may occasionally cause tissue and blood in the blood vessel to carbonize and crust and adhere to the working section of the heating wire, affecting the ablation closure effect.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] An intravascular radiofrequency plasma closure catheter for veins, which includes a catheter front end, a mouth guard, a handle assembly, and a cable assembly; the catheter front end is connected to the front end of the handle assembly through the mouth guard, and the cable assembly is arranged at the rear end of the handle assembly;

[0007] The catheter front end includes a treatment section. A plasma working electrode is arranged outside the treatment section, and a radiofrequency heating coil is arranged inside the treatment section. The handle assembly controls the plasma working electrode to strip the tissue adhering to the radiofrequency heating coil, and the plasma working electrode performs low-temperature heating ablation operation on the tissue and the working channel of the radiofrequency heating coil.

[0008] Preferably, the front end of the catheter further includes an insertion section, which is connected to the rear end of the treatment section. The treatment section and the insertion section are guided by a guide wire into the lower limb vein vessel to be closed.

[0009] Preferably, the treatment section further includes an outer tube and a hollow inner tube. The rear end of the outer tube is connected to the front end of the mouth guard. The front end of the outer tube is equipped with a plasma working electrode. The hollow inner tube is arranged inside the outer tube. The front end of the hollow inner tube is sleeved with a radiofrequency heating coil. The tail end of the hollow inner tube extends to the end of the handle assembly for the guide wire to pass through.

[0010] Preferably, the front end of the hollow inner tube is provided with a ball head, and a guide wire cavity is opened inside the ball head.

[0011] Preferably, the handle assembly includes a sliding button and a circuit board. A groove is opened in the middle of the circuit board, and the sliding button slides back and forth in the groove; the rear end of the outer tube extends into the handle assembly and is snap-connected to the sliding button.

[0012] Preferably, a fixed button is provided at the end of the circuit board for starting and stopping the output of radiofrequency or plasma energy for closing the catheter in the vein cavity.

[0013] Preferably, the plasma working electrode includes a first electrode and a second electrode. Both the first electrode and the second electrode include an electrode head arranged at the front end, a support rod arranged outside the electrode head, and a snap block connected to the tail end of the support rod. A limiting member is arranged at the bottom of the electrode head.

[0014] Preferably, mounting grooves, snap grooves and limiting grooves are respectively opened on the front outer side of the outer tube. The mounting grooves are fitted with the support rods, the snap blocks are installed in the snap grooves, and the limiting members are inserted into the limiting grooves.

[0015] Preferably, wire holes are symmetrically opened on the inner wall of the outer tube, and wires connecting the plasma working electrodes are arranged in the wire holes.

[0016] The present invention has the following beneficial effects:

[0017] In the present invention, a sliding button is arranged on the handle and connected to the outer tube, and a plasma electrode is arranged at the front end of the outer tube. The reciprocating movement of the sliding button is used to clean the radiofrequency heating coil arranged at the front end of the inner tube back and forth, so that the tissue scabs and the like adhered to the heating coil fall off, which is convenient for better ablation and closing of the subsequent blood vessels. There is no need to pull out the catheter for cleaning, saving the operation time and improving the operation efficiency;

[0018] At the same time, the plasma electrode at the front end of the outer tube is used to perform cryogenic heating ablation on the tissue scabs in the blood vessel and the end of the working channel of the heating coil, further closing the blood vessel and improving the closing effect of the venous blood vessel. Description of the Drawings

[0019] Figure 1Structural schematic diagram of the radiofrequency plasma closure catheter in the vein cavity of the present invention;

[0020] Figure 2 Internal structural schematic diagram of the handle assembly;

[0021] Figure 3 Overall structural schematic diagram of the treatment section at the front end of the catheter;

[0022] Figure 4 is Figure 3 Internal structural schematic diagram;

[0023] Figure 5 Structural schematic diagram of the sliding button, outer tube and inner tube;

[0024] Figure 6 Structural schematic diagram of the front end of the outer tube;

[0025] Figure 7 Structural schematic diagram of the plasma working electrode;

[0026] Figures 1 to 7 The reference numerals shown in the figure are respectively represented as: the front end of the catheter 1, the treatment section 11, the plasma working electrode 111, the electrode head 1111, the support rod 1112, the clamping block 1113, the limiting member 1114, the heating coil 112, the outer tube 113, the installation groove 1131, the clamping groove 1132, the limiting groove 1133, the wire hole 1134, the hollow inner tube 114, the ball head 115, the guide wire cavity 116, the insertion section 12, the mouth guard 2, the handle assembly 3, the upper shell 31, the lower shell 32, the sliding button 33, the fixed button 34, the circuit board 35, the cable assembly 4. Detailed implementation manners

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0028] Refer to Figures 1-2, the present invention provides a radiofrequency plasma closure catheter in the vein cavity, which includes a catheter front end 1, a mouth guard 2, a handle assembly 3 and a cable assembly 4. The catheter front end 1 is arranged at the front end of the handle assembly 3 through the mouth guard 2, and the cable assembly 4 is arranged at the rear end of the handle assembly 3. The handle assembly 3 includes an upper shell 31, a lower shell 32, a sliding button 33, a fixed button 34 and a circuit board 35. The cable assembly 4 includes a cable and a connector that are communicatively connected to the host wire. The catheter front end 1 includes a treatment section 11 and an insertion section 12. The treatment section 11 and the insertion section 12 are guided by a guide wire into the lower limb vein blood vessel to be closed. The treatment section 11 includes a plasma working electrode 111 arranged on the outside and a radiofrequency heating coil 112 arranged on the inside. The movement of the plasma working electrode 111 can be controlled by the sliding button 33 to peel off the tissue adhered to the heating coil 112, and at the same time, the electrode can be used to perform low-temperature heating ablation on these tissues and the working channel of the heating coil 112, so as to better close the blood vessel.

[0029] Refer to Figures 1-2 , a plurality of mounting holes are formed on the circuit board 35 and are fixed in cooperation with the corresponding convex columns on the upper shell 31 / lower shell 32. A groove is formed in the middle of the circuit board 35 for the sliding button 33 to slide back and forth therein. The fixed button 34 is arranged at the end of the circuit board 35. The circuit board 35 is communicatively connected to the host through the cable assembly 4. Pressing the fixed button 34 can indirectly trigger the micro button switch on the circuit board 35 to realize the start and stop of the radiofrequency or plasma energy output of the vein cavity closure catheter, and transmit the energy to the heating coil 112 or the plasma working electrode 111 respectively through the wire of the cable assembly 4. The working modes of radiofrequency or plasma can be switched on the host;

[0030] The mouth guard 2 is sleeved on the tail end of the insertion section 12 and is fixedly sleeved at the front end spout of the upper shell 31 and the lower shell 32, and can tightly fit the upper shell 31 and the lower shell 32.

[0031] Refer to Figures 3-4 , the closure catheter includes an outer tube 113 and a hollow inner tube 114 sleeved inside the outer tube 113. The catheter front end includes a treatment section 11 and an insertion section 12. The insertion section 12 is used to send the treatment section into the vein blood vessel under the guidance of a guide wire. The treatment section 11 includes a heating coil 112 sleeved on the front end of the hollow inner tube 114 and a plasma working electrode 111 installed at the front end of the outer tube 113. The wire of the heating coil 112 can extend along the inner tube along the tube wall to the cable assembly 4; A ball head 115 with a guide wire cavity 116 is arranged at the front end head of the hollow inner tube 114, which can facilitate the passing of the guide wire, and the ball head 115 can avoid damaging the blood vessel by the catheter front end;

[0032] The hollow inner tube 114 can be made of a PI tube, and the outer tube 113 can be a semi-flexible tube. The semi-flexible tube has a certain flexibility and strength, can adapt to deformation such as bending, and has properties such as corrosion resistance, high pressure resistance, and high temperature resistance. Using a semi-flexible tube for the outer tube 113 can both support the entire catheter and enable the catheter to bend adaptively with the blood vessel; the tail end of the hollow inner tube 114 extends all the way to the opening at the inner end of the handle 3 for the guide wire to pass through, and the tail end of the outer tube 113 extends into the handle 3 and is snap-connected to the sliding button 33 which is limited and installed in the circuit board cavity. The upper surface of the sliding button 33 is provided with anti-slip lines, as Figure 5 shown; for the convenience of display, the length ratio of the closed catheter in the figure in this embodiment is only schematic, and its length can be adjusted according to the surgical needs.

[0033] Referring to Figures 6-7 , the plasma working electrode 111 includes a first electrode and a second electrode with the same structure. The two electrodes are respectively installed on both sides of the front end of the outer tube 113, one positive and one negative; specifically, the working electrode 111 includes an electrode head 1111 in contact with the tissue for discharging, a support rod 1112, a clamping block 1113, and a limiting member 1114. Correspondingly, an installation groove 1131, a clamping groove 1132, a limiting groove 1133, and an insulating gap 1134 (where an insulating component can be placed) for separating the two working electrodes are opened on the side surface of the front end of the outer tube 113. The arc-shaped thin sheet-like support rod 1112 is adhered to the surface of the installation groove 1131. The clamping block 1113 at one end of the support rod 1112 protrudes inward and is installed in the clamping groove 1132, and the other end is fixedly connected to the semi-circular electrode head 1111 to fix the electrode to the front end of the outer tube 113. At the same time, the limiting member 1114 arranged on the rear end surface of the electrode head 1111 and parallel to the support rod 1112 is inserted into the limiting groove 1133 on the inner wall of the outer tube 113 to further enhance the stability of the working electrode 111; in addition, two wire holes 1134 extending from the front end to the rear end are opened on both inner walls of the outer tube 113. Wires connected to the two working electrodes 111 pass through the wire holes 1134, and the wires are connected to the host through the cable assembly 4;

[0034] Insulating components (such as ceramic chips) can be placed in the insulating gap 1134 to increase the insulation performance and prevent the two electrodes from being directly short-circuited.

[0035] When the closed catheter of the present invention is in use, first connect the cable assembly 4 to the host, and set the host to the radiofrequency ablation mode. Then, under the guidance of the inner tube guide wire, send the front end of the catheter into the lower limb vein blood vessel to be closed. Slide the sliding button 33 on the handle assembly 3 backward to drive the outer tube to move backward and expose the heating coil 112 of the treatment section 11. Then, press the fixed button to start radiofrequency treatment. The host generates radiofrequency energy and transmits it through the wire to the heating coil to heat the target blood vessel, causing the blood vessel corresponding to the treatment section to shrink and gradually close. Then, slowly move the treatment section backward to the adjacent next section of the blood vessel, push the sliding button forward to the front end of the handle to make the outer tube move towards the heating coil and completely cover the heating coil, so as to peel off and remove the carbonized tissue, blood scab, etc. adhered to the heating coil, which is convenient for better ablation and closure of the subsequent blood vessels. There is no need to pull out the catheter for cleaning, saving the operation time;

[0036] Next, switch the host to the plasma ablation mode, press the fixed button to start plasma treatment, and perform cryogenic plasma ablation and coagulation on the tissue, scab in the blood vessel and the end of the closed blood vessel in the previous section through the two working electrodes, so as to better close the working channel of the heating coil in the blood vessel and further improve the closing effect of the venous blood vessel;

[0037] Then continuously repeat the above process, first perform radiofrequency ablation and closure and then perform plasma ablation and closure until the entire lower limb vein blood vessel is closed, and then take out the closed catheter to end the operation.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A radiofrequency plasma sealing catheter in a vein cavity, characterized in that: include: A catheter front end (1), a mouthpiece (2), a handle assembly (3) and a cable assembly (4), wherein the catheter front end (1) is connected to the front end of the handle assembly (3) via the mouthpiece (2), and the cable assembly (4) is arranged at the rear end of the handle assembly (3); The front end (1) of the catheter comprises a treatment section (11), the outside of the treatment section (11) is provided with a plasma working electrode (111), the inside of the treatment section (11) is provided with a radio frequency heating coil (112), the handle assembly (3) controls the plasma working electrode (111) to peel off tissue adhered to the radio frequency heating coil (112), and the plasma working electrode (111) performs low-temperature heating and ablation operations on the tissue and the working channel of the radio frequency heating coil (112); the treatment section ( 11) also includes an outer tube (113) and a hollow inner tube (114), the rear end of the outer tube (113) is connected to the front end of the mouthpiece (2), the front end of the outer tube (113) is mounted with the plasma working electrode (111), the hollow inner tube (114) is arranged inside the outer tube (113), the front end of the hollow inner tube (114) is sleeved with the radio frequency heating coil (112), and the rear end of the hollow inner tube (114) extends to the end of the handle assembly (3) for the guide wire to pass through.

2. The intravenous radiofrequency plasma sealing catheter according to claim 1, characterized in that: The front end (1) of the catheter further comprises an insertion section (12), wherein the insertion section (12) is connected to the rear end of the treatment section (11), and the treatment section (11) and the insertion section (12) are guided into the lower limb vein to be closed via a guide wire.

3. The intravenous radiofrequency plasma sealing catheter according to claim 1, characterized in that: A ball head (115) is provided at the front end of the hollow inner tube (114), and a guide wire cavity (116) is provided inside the ball head (115).

4. The intravenous radiofrequency plasma sealing catheter according to claim 3, characterized in that: The handle assembly (3) comprises a sliding button (33) and a circuit board (35); a groove is provided in the middle of the circuit board (35), and the sliding button (33) slides back and forth in the groove; the rear end of the outer tube (113) extends into the handle assembly (3) and is engaged with the sliding button (33).

5. The intravenous radiofrequency plasma sealing catheter according to claim 4, characterized in that: A fixed button (34) is provided at the end of the circuit board (35) for starting and stopping the radio frequency or plasma energy output of the intravenous closed catheter.

6. The intravenous radiofrequency plasma sealing catheter according to claim 1, characterized in that: The plasma working electrode (111) comprises a first electrode and a second electrode, each of the first electrode and the second electrode comprising an electrode head (1111) arranged at a front end, a support rod (1112) arranged outside the electrode head (1111), and a clamping block (1113) connected to the rear end of the support rod (1112), and a limiting piece (1114) is provided at the bottom of the electrode head (1111).

7. The intravenous radiofrequency plasma sealing catheter according to claim 6, characterized in that: The front outer side of the outer tube (113) is respectively provided with a mounting groove (1131), a clamping groove (1132) and a limiting groove (1133); the mounting groove (1131) is fitted with the support rod (1112); the clamping block (1113) is installed in the clamping groove (1132); and the limiting member (1114) is inserted into the limiting groove (1133).

8. The intravenous radiofrequency plasma sealing catheter according to claim 7, characterized in that: Wire holes (1134) are symmetrically provided on the inner wall of the outer tube (113), and wires connected to the plasma working electrode (111) are arranged in the wire holes (1134).

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