Pulse and pressure combined radiofrequency ablation catheter

Abstract

The present application relates to a kind of pulse and pressure combined action radio frequency ablation catheter, including first electrode ablation part and second electrode ablation part, first electrode ablation part and second electrode ablation part are parallelly arranged, first electrode ablation part and second electrode ablation part alternate effect tissue not only avoid any one electrode ablation part temperature too high and cause charring damage to tissue, and also can adjust any one electrode ablation part to the pressure of tissue and ensure heat melting effect.The present application is heated to tissue by pulse, and by spare electrode ablation part and replacement, avoid the charring of electrode ablation part with temperature too high to tissue.

Description

Technical Field

[0001] This invention relates to the field of radiofrequency ablation technology, and in particular to a radiofrequency ablation catheter that combines pulse and pressure action. Background Technology

[0002] Radiofrequency ablation technology mainly relies on radiofrequency therapy devices with ablation and cutting functions, and its treatment mechanism is mainly thermal effect. When radiofrequency current flows through human tissue, the rapid change of electromagnetic field causes polarized water molecules in the tissue to move at high speed, generating heat (i.e., endogenous thermal effect), which causes the water inside and outside the cells to evaporate, dry, shrink and slough off, resulting in aseptic necrosis, thereby achieving the purpose of treatment.

[0003] In radiofrequency ablation therapy, the commonly used instrument is the radiofrequency ablation catheter. The catheter is inserted into a blood vessel to reach the lesion site for ablation. Moving under the influence of a high-frequency electric field generates a high-frequency current, simultaneously producing Joule heating, causing a rapid rise in temperature. This denatures and inactivates the tissue near the electrode, achieving the goal of tissue ablation.

[0004] Existing ablation catheters have the following technical defects: the high temperature of existing ablation catheters (60℃-100℃) can easily lead to carbonization of the tissue around the electrode; at the same time, some lesions may not achieve thermal ablation due to insufficient heating. Overheating or underheating of tissues can result in poor treatment effects. Summary of the Invention

[0005] This invention designs a radiofrequency ablation catheter that combines pulse and pressure action, solving at least one of the technical problems raised in the background art.

[0006] To solve the aforementioned technical problems, the present invention adopts the following solution:

[0007] In a first aspect, the present invention provides a radiofrequency ablation catheter that combines pulse and pressure action, the radiofrequency ablation catheter comprising:

[0008] First electrode ablation zone;

[0009] The second electrode ablation section is arranged in parallel with the first electrode ablation section and the second electrode ablation section.

[0010] Furthermore, the radiofrequency ablation catheter has a first state and a second state;

[0011] In the first state, the first electrode ablation section extends and performs radiofrequency ablation, while the second electrode ablation section retracts to the rear of the first electrode ablation section.

[0012] In the second state, the second electrode ablation section extends and performs radiofrequency ablation, while the first electrode ablation section retracts to the rear of the second electrode ablation section.

[0013] Preferably, the first electrode ablation section and the second electrode ablation section are configured to move in opposite directions horizontally.

[0014] Preferably, the radiofrequency ablation catheter further includes:

[0015] A housing, wherein the housing is a cavity with an opening at one end;

[0016] The first electrode ablation section and the second electrode ablation section are located in the housing;

[0017] When the first electrode ablation part extends out of the shell, the second electrode ablation part retracts into the shell, or when the second electrode ablation part extends out of the shell, the first electrode ablation part retracts into the shell.

[0018] Preferably, the radiofrequency ablation catheter further includes:

[0019] The transmission mechanism includes:

[0020] A first transmission rack is disposed on the side of the ablation portion of the first electrode;

[0021] and, a second transmission rack disposed on the side of the second electrode ablation section;

[0022] Also includes:

[0023] The transmission gear meshes with the first transmission rack and the second transmission rack respectively, and drives the first electrode ablation part and the second electrode ablation part to slide in opposite directions.

[0024] Preferably, the radiofrequency ablation catheter further includes:

[0025] The drive device includes:

[0026] A magnet, which is fixed to the end of the first electrode ablation portion or the end of the second electrode ablation portion;

[0027] An electromagnetic adsorption device is provided, which generates magnetic force and attracts the magnet, driving the first electrode ablation section or the second electrode ablation section to move toward the electromagnetic adsorption device.

[0028] Preferably, the drive device further includes:

[0029] A spring, one end of which is connected to the electromagnetic adsorption device, and the other end of which is connected to the magnet.

[0030] Preferably, the end of the first electrode ablation section is provided with a first pressure sensor, and the end of the second electrode ablation section is provided with a second pressure sensor;

[0031] The first electrode ablation section is equipped with a first temperature sensor, and the second electrode ablation section is equipped with a second temperature sensor.

[0032] Preferably, the opposite sides of the first electrode ablation section and the second electrode ablation section are configured with concave and convex structures that cooperate with each other.

[0033] Preferably, the housing has multiple guide grooves along its length, and the outer walls of both the first electrode ablation section and the second electrode ablation section are provided with guide rods, which can slide in the guide grooves.

[0034] Secondly, the present invention also provides a method for controlling a radiofrequency ablation catheter that combines pulse and pressure action, comprising the following steps:

[0035] The first electrode ablation section performs the ablation operation, while the second electrode ablation section is located behind the first electrode ablation section and is ready for use. The first temperature sensor monitors the temperature of the first electrode ablation section, and the first pressure sensor detects the pressure value generated by the first electrode ablation section on the tissue.

[0036] When the temperature value output by the first temperature sensor is higher than the set value T1, the drive device is activated, causing the high-temperature first electrode ablation part to move backward for cooling, while the low-temperature second electrode ablation part moves forward.

[0037] When the output value of the second pressure sensor of the second electrode ablation section reaches the preset value P1, the second electrode ablation section is activated to perform ablation.

[0038] When the output temperature of the second temperature sensor of the second electrode ablation section is higher than T2, the drive device is activated to reduce the magnetic force so that the spring is reset, thereby the first electrode ablation section moves forward and the second electrode ablation section moves backward. The value of the second pressure sensor decreases to P2, and the temperature T1 > temperature T2 and the pressure P1 > pressure P2.

[0039] When the output temperature of the second temperature sensor is higher than T1, the drive device shuts off the magnetic force, and the spring causes the first electrode ablation part to extend out of the shell and contact the tissue to reheat the tissue. The second electrode ablation part then returns to the shell to cool down, ready for the next use.

[0040] The radiofrequency ablation catheter, which combines pulse and pressure, has the following beneficial effects:

[0041] (1) The present invention provides a first electrode ablation section and a second electrode ablation section, which can work alternately to avoid carbonization of tissue by the electrode ablation section with excessively high temperature.

[0042] (2) The present invention uses a pressure sensor to determine the degree of contact between the electrode ablation part and the tissue, so that the electrode ablation part can be in close contact with the tissue at low temperature and the electrode ablation part can be gradually separated from the tissue at high temperature, thus achieving the dual goals of avoiding carbonization and ensuring heating quality.

[0043] (3) The present invention sets two temperatures. At the lower safe temperature, the temperature can be controlled by moving the electrode ablation part to reduce its contact area with the tissue. At the higher temperature, the temperature can be controlled by replacing the electrode ablation part, which ensures the heating quality and shortens the operation time. Attached Figure Description

[0044] Figure 1 : Schematic diagram of the first working state of the radiofrequency ablation catheter of the present invention with combined pulse and pressure action;

[0045] Figure 2 : Schematic diagram of the second working state of the radiofrequency ablation catheter of the present invention with combined pulse and pressure action;

[0046] Figure 3 : Schematic diagram of the third working state of the radiofrequency ablation catheter of the present invention with combined pulse and pressure action;

[0047] Figure 4 : A schematic diagram of the transmission structure of the first electrode ablation section in this invention;

[0048] Figure 5 : Schematic diagram of the transmission structure of the second electrode ablation section in this invention;

[0049] Figure 6 : A schematic diagram showing the connection between the first electrode ablation section and the second electrode ablation section in this invention via a transmission structure;

[0050] Figure 7 The present invention comprises a combined structure of the first electrode ablation section and the second electrode ablation section;

[0051] Figure 8 : An exploded view of the combined structure of the first electrode ablation section and the second electrode ablation section in this invention;

[0052] Explanation of reference numerals in the attached figures:

[0053] 11—Housing; 12—Cavity; 13—Mounting bracket; 14—Guide groove; 21—First electrode ablation section; 211—First guide rod; 212—First protrusion; 22—First pressure sensor; 23—Second electrode ablation section; 231—Second guide rod; 232—Second protrusion; 24—Second pressure sensor; 31—Electromagnetic adsorption device; 32—Magnet; 33—Spring; 4—Transmission gear; 41—First transmission rack; 42—Second transmission rack; 43—First rotating shaft bracket; 44—Second rotating shaft bracket; 45—Mounting cavity. Detailed Implementation

[0054] The following is combined with Figures 1 to 8 The present invention will be further described as follows:

[0055] like Figures 1 to 3 As shown, this embodiment of the invention provides a radiofrequency ablation catheter with combined pulse and pressure action. The radiofrequency ablation catheter includes a first electrode ablation section 21 and a second electrode ablation section 23, which are arranged in parallel.

[0056] The radiofrequency ablation catheter has a first state and a second state;

[0057] In the first state, the first electrode ablation section 21 extends and performs radiofrequency ablation, while the second electrode ablation section 23 retracts to the rear of the first electrode ablation section 21.

[0058] In the second state, the second electrode ablation section 23 extends and performs radiofrequency ablation, while the first electrode ablation section 21 retracts to the rear of the second electrode ablation section 23.

[0059] By providing a first electrode ablation section 21 and a second electrode ablation section 23, the first electrode ablation section 21 and the second electrode ablation section 23 can operate alternately. In a first state, the first electrode ablation section 21 extends and performs radiofrequency ablation. When the temperature of the first electrode ablation section 21 becomes too high, a second state is executed, in which the first electrode ablation section 21 retracts, and the second electrode ablation section 23 extends and performs radiofrequency ablation, during which the first electrode ablation section 21 cools down. Similarly, when the operating temperature of the second electrode ablation section 23 becomes too high, the second electrode ablation section 23 retracts for cooling, and the first electrode ablation section 21 extends and performs radiofrequency ablation. This alternating operation between the first and second states prevents the electrode ablation section from carbonizing the tissue due to excessively high temperatures.

[0060] Based on the above embodiments, this embodiment of the invention further provides that the first electrode ablation section 21 and the second electrode ablation section 23 are configured to perform horizontally opposite movements. By enabling the first electrode ablation section 21 and the second electrode ablation section 23 to move horizontally, alternating operation between the first state and the second state is achieved.

[0061] In one embodiment, the radiofrequency ablation catheter further includes a housing 11, through which the first electrode ablation part 21 and the second electrode ablation part 23 are assembled. The housing 11 is a cavity with an opening at one end; the first electrode ablation part 21 and the second electrode ablation part 23 are located in the housing 11.

[0062] Specifically, when the first electrode ablation section 21 extends out of the housing 1, the second electrode ablation section 23 retracts into the housing; or when the second electrode ablation section 23 extends out of the housing 1, the first electrode ablation section 23 retracts into the housing. That is, alternating operation between the first and second states is achieved by the first electrode ablation section 21 and the second electrode ablation section 23 alternately extending out of the housing 1.

[0063] In one embodiment, such as Figure 4 and Figure 5 As shown, the radiofrequency ablation catheter further includes a transmission mechanism, which includes a first transmission rack 41 disposed on the side of the first electrode ablation section 21; and a second transmission rack 42 disposed on the side of the second electrode ablation section 23; and a transmission gear 4, which meshes with the first transmission rack 41 and the second transmission rack 42 respectively, and drives the first electrode ablation section 21 and the second electrode ablation section 23 to slide in opposite directions. Specifically, the upper and lower sides of the transmission gear 4 mesh with the first transmission rack 41 and the second transmission rack 42 respectively.

[0064] Furthermore, such as Figure 6 As shown, the first electrode ablation section 21 is provided with a first protrusion 212, and the second electrode ablation section 23 is provided with a second protrusion 232. A first transmission rack 41 is mounted on the first protrusion 212, and a second transmission rack 42 is mounted on the second protrusion 232. A mounting cavity 45 is formed between the second protrusion 232 and the first protrusion 212. The transmission gear 4 is mounted in the mounting cavity 45. One end of the shaft of the transmission gear 4 is connected to the top of the housing 11 through a first shaft bracket 43, and the other end of the shaft of the transmission gear 4 is connected to the bottom of the housing 11 through a second shaft bracket 44. The connection structure of the first shaft bracket 43 and the second shaft bracket 44 allows the transmission gear 4 to be independently located in the mounting cavity and rotate freely.

[0065] In one embodiment, the radiofrequency ablation catheter further includes a driving device, which includes a magnet 32 ​​and an electromagnetic adsorption device 31. The magnet 32 ​​is fixed to the end of the first electrode ablation section 21 or the end of the second electrode ablation section 23. The electromagnetic adsorption device 31 can generate magnetic force and attract the magnet 32, driving the first electrode ablation section 21 or the second electrode ablation section 23 to move toward the electromagnetic adsorption device 31.

[0066] Specifically, the electromagnetic adsorption device 31 is installed in the cavity 12 of the housing 11 via the mounting bracket 12, and the magnet 32 ​​is installed at the end of the first electrode ablation part 21 or the second electrode ablation part 23. The electromagnetic adsorption device 31 attracts the magnet 32 ​​by generating magnetic force, thereby causing the first electrode ablation part 21 or the second electrode ablation part 23 to move toward the electromagnetic adsorption device 31.

[0067] In one embodiment, the driving device further includes a spring 33, one end of which is connected to the electromagnetic adsorption device 31, and the other end of which is connected to the magnet 32.

[0068] In the above embodiments, the electromagnetic adsorption device 31 generates a controllable magnetic force, thereby making the displacement of the first electrode ablation section 21 or the second electrode ablation section 23 controllable. The electromagnetic adsorption device 31 generates a magnetic force, and the elastic restoring force of the spring 33 enables the first electrode ablation section 21 and the second electrode ablation section 23 to reciprocate horizontally.

[0069] In one embodiment, the housing 11 has multiple guide grooves 14 along its length. Guide rods are provided on the outer walls of both the first electrode ablation section 21 and the second electrode ablation section 23, and these guide rods are capable of sliding within the guide grooves 14. Specifically, the outer wall of the first electrode ablation section 21 is provided with a first guide rod 211, which is capable of sliding within one guide groove 14; the outer wall of the second electrode ablation section 23 is provided with a second guide rod 231, which is capable of sliding within another guide groove 14.

[0070] In one embodiment, such as Figure 7 and Figure 8 As shown, the opposing sides of the first electrode ablation section 21 and the second electrode ablation section 23 are configured with concave and convex structures that cooperate with each other. The mutual insertion and cooperation of the two sides through the concave and convex structures can ensure that the contact areas of the first electrode ablation section 21 and the second electrode ablation section 23 with the body tissue are basically the same, thereby improving the quality and efficiency of the ablation operation.

[0071] In one embodiment, a first pressure sensor 22 is provided at the end of the first electrode ablation section 21, and a second pressure sensor 24 is provided at the end of the second electrode ablation section 23.

[0072] The first electrode ablation section 21 is provided with a first temperature sensor, and the second electrode ablation section 23 is provided with a second temperature sensor.

[0073] The working temperature of the first electrode ablation section 21 and the second electrode ablation section 23 is monitored in real time by setting a first temperature sensor and a second temperature sensor. The contact tightness between the first electrode ablation section 21 and the second electrode ablation section 23 and the body tissue is monitored in real time by setting a first pressure sensor 22 and a second pressure sensor 24.

[0074] Based on the above embodiments, this invention also provides a method for controlling a radiofrequency ablation catheter that combines pulse and pressure, comprising the following steps:

[0075] The first electrode ablation section 21 performs the ablation operation, the second electrode ablation section 23 is located behind the first electrode ablation section 21 and is ready for use, the first temperature sensor monitors the temperature of the first electrode ablation section 21, and the first pressure sensor detects the pressure value generated by the first electrode ablation section 21 on the tissue.

[0076] When the temperature value output by the first temperature sensor is higher than the set value T1, the drive device is activated, causing the high-temperature first electrode ablation section 21 to move backward for cooling, while the low-temperature second electrode ablation section 23 moves forward; thus achieving alternating operation and avoiding carbonization damage to the tissue caused by excessively high temperature.

[0077] When the output value of the second pressure sensor of the second electrode ablation section 23 reaches the preset value P1, the second electrode ablation section 23 is activated to perform ablation operation.

[0078] When the output temperature of the second temperature sensor of the second electrode ablation section 23 is higher than T2, the drive device is activated to reduce the magnetic force, causing the spring 33 to reset. As a result, the first electrode ablation section 21 moves forward and the second electrode ablation section 23 moves backward. The value of the second pressure sensor decreases to P2, and the temperature T1 > temperature T2 and the pressure P1 > pressure P2. This ensures that the second electrode ablation section 23 with a higher temperature maintains a certain working distance from the tissue, avoiding carbonization damage to the tissue caused by excessively high temperature.

[0079] When the output temperature of the second temperature sensor is higher than T1, the drive device shuts off the magnetic force, and the spring causes the first electrode ablation part 21 to extend out of the shell and contact the tissue to reheat the tissue. The second electrode ablation part 23 returns to the shell to cool down, waiting for the next use.

[0080] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A radiofrequency ablation catheter with combined pulse and pressure action, characterized in that: The radiofrequency ablation catheter includes: First electrode ablation section (21); The second electrode ablation section (23) is arranged in parallel with the first electrode ablation section (21); Furthermore, the radiofrequency ablation catheter has a first state and a second state; In the first state, the first electrode ablation section (21) extends and performs radiofrequency ablation, while the second electrode ablation section (23) retracts to the rear of the first electrode ablation section (21); In the second state, the second electrode ablation section (23) extends and performs radiofrequency ablation, while the first electrode ablation section (21) retracts to the rear of the second electrode ablation section (23).

2. The radiofrequency ablation catheter with combined pulse and pressure action according to claim 1, characterized in that: The first electrode ablation section (21) and the second electrode ablation section (23) are configured to be able to move in opposite directions horizontally.

3. The radiofrequency ablation catheter with combined pulse and pressure action according to claim 1, characterized in that: The radiofrequency ablation catheter also includes: The housing (11) is a cavity with an opening at one end; The first electrode ablation section (21) and the second electrode ablation section (23) are located in the housing (11); When the first electrode ablation part (21) extends out of the shell (11), the second electrode ablation part (23) retracts into the shell, or when the second electrode ablation part (23) extends out of the shell (11), the first electrode ablation part (21) retracts into the shell.

4. The radiofrequency ablation catheter with combined pulse and pressure action according to claim 1, characterized in that: The radiofrequency ablation catheter also includes: The transmission mechanism includes: The first transmission rack (41) is disposed on the side of the first electrode ablation section (21); And, the second transmission rack (42) is disposed on the side of the second electrode ablation section (23); Also includes: The transmission gear (4) meshes with the first transmission rack (41) and the second transmission rack (42) respectively, and drives the first electrode ablation part (21) and the second electrode ablation part (23) to slide in opposite directions.

5. The radiofrequency ablation catheter with combined pulse and pressure action according to claim 1, characterized in that: The radiofrequency ablation catheter also includes: The drive device includes: A magnet (32) is fixed to the end of the first electrode ablation section (21) or the end of the second electrode ablation section (23); The electromagnetic adsorption device (31) can generate magnetic force and adsorb the magnet (32), driving the first electrode ablation part (21) or the second electrode ablation part (23) to move in the direction of the electromagnetic adsorption device (31).

6. The radiofrequency ablation catheter with combined pulse and pressure action according to claim 5, characterized in that: The drive device further includes: A spring (33) is connected at one end to the electromagnetic adsorption device (31) and at the other end to the magnet (32).

7. The radiofrequency ablation catheter with combined pulse and pressure action according to claim 1, characterized in that, The first electrode ablation section (21) is provided with a first pressure sensor (22) at its end, and the second electrode ablation section (23) is provided with a second pressure sensor (23). Force sensor (24); The first electrode ablation section (21) is provided with a first temperature sensor, and the second electrode ablation section (23) is provided with a second temperature sensor.

8. The radiofrequency ablation catheter with combined pulse and pressure action according to claim 3, characterized in that: The housing (11) has multiple guide grooves (14) along its length. The outer walls of the first electrode ablation part (21) and the second electrode ablation part (23) are provided with guide rods, which can slide in the guide grooves (14).

9. The radiofrequency ablation catheter with combined pulse and pressure action according to any one of claims 1-8, characterized in that, The opposing sides of the first electrode ablation section (21) and the second electrode ablation section (23) are configured with concave and convex structures that cooperate with each other.

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