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CN-121971159-A - Controllable sequence bending sheath tube for radio frequency catheter and method

CN121971159ACN 121971159 ACN121971159 ACN 121971159ACN-121971159-A

Abstract

The invention discloses a controllable sequence bending sheath tube for a radio frequency catheter and a method thereof, which relate to the technical field of radio frequency ablation and comprise a handle, wherein the rear end of the handle is provided with a guide wire cavity, a connector and a perfusion cavity, the front end of the handle is provided with a catheter main tube, the catheter is characterized in that a size marking ring is arranged at the middle section of the catheter main pipe, a tip is arranged at one end, far away from the handle, of the catheter main pipe, and an electrode is arranged on the catheter main pipe and located between the size marking ring and the tip. According to the invention, the liquid film is formed by uniformly exuding the salt water through the ceramic micropores, so that the heat exchange efficiency is obviously improved, the surface temperature of the electrode is stabilized below 60 ℃, carbonization is effectively avoided, meanwhile, the physical isolation between an electric field and cooling is realized by utilizing the dielectric property of the ceramic, a treatment temperature zone of 80-95 ℃ is formed in deep tissues, the ablation depth and consistency are improved, the biological safety, the operation reliability and the cost advantage are considered in combination with the platinum iridium alloy conductive layer and the closed-loop PID temperature control, and a safer and more efficient solution is provided for radio frequency ablation.

Inventors

  • LI RUIQIANG
  • DONG YU
  • DAI YAN
  • DAI CHENCHEN
  • HE TAO

Assignees

  • 四川兴泰普乐医疗科技有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (8)

  1. 1. A controllable sequence bending sheath for a radio frequency catheter, which comprises a handle (1), and is characterized in that: The novel catheter is characterized in that a guide wire cavity (2), a connector (3) and a perfusion cavity (4) are arranged at the rear end of the handle (1), a catheter main pipe (5) is arranged at the front end of the handle (1), a size marking ring (6) is arranged in the middle section of the catheter main pipe (5), a tip (7) is arranged at one end, far away from the handle (1), of the catheter main pipe (5), an electrode (8) is arranged on the catheter main pipe (5), and the electrode is located between the size marking ring (6) and the tip (7).
  2. 2. The controllable sequential bending sheath for a radio frequency catheter according to claim 1, wherein the electrode (8) comprises a conductive layer (81), the conductive layer (81) is fixedly arranged in the catheter main tube (5) and is positioned at one end close to the tip (7), the conductive layer (81) is in a cylindrical structure, the conductive layer (81) is a substrate formed by ceramics, the material is aluminum oxide-based composite ceramics, a continuous metal layer is formed on the outer layer of the ceramics through magnetron sputtering, the metal layer adopts platinum iridium alloy as a material, and a plurality of micropores are formed on the conductive layer (81).
  3. 3. The controllable sequential bending sheath for a radio frequency catheter according to claim 2, wherein the conductive layer (81) is provided with two anodes (811) and two cathodes (812), the anodes (811) are respectively and fixedly arranged at two ends of the conductive layer (81), the two anodes (811) are communicated through the conductive layer (81), the cathodes (812) are fixedly arranged in the middle of the conductive layer (81), an insulating layer is arranged between the inner wall of the cathodes (812) and the outer wall of the conductive layer (81), and a plurality of micropores are formed in the anodes (811) and the cathodes (812) and aligned with the micropores on the conductive layer (81).
  4. 4. A controlled sequence of flexible elongate sheaths for a radio frequency catheter according to claim 3 wherein a central cooling chamber (82) is provided within the electrode (8), the central cooling chamber (82) being in communication with the micro-pores of the conductive layer (81), the positive electrode (811) and the negative electrode (812).
  5. 5. A controllable sequential bending sheath for a radio frequency catheter according to claim 4, wherein one end of the electrode (8) close to the handle (1) is provided with a plurality of liquid supply pipelines (83), one end of the electrode is positioned in the central cooling cavity (82), the other end of the electrode is positioned in the catheter main pipe (5), and the catheter main pipe (5) is communicated with the central cooling cavity (82) through the liquid supply pipelines (83).
  6. 6. The controlled sequence flexible sheath for a radio frequency catheter according to claim 5, wherein a return line (84) is arranged in the central cooling cavity (82), a liquid inlet of the return line (84) is positioned at one end of the interior of the central cooling cavity (82) far away from the handle (1), and a liquid outlet of the return line (84) is positioned outside one end of the electrode (8) close to the handle (1) and is positioned inside the catheter main tube (5).
  7. 7. The controlled sequence bending sheath for a radio frequency catheter according to claim 6, wherein a temperature sensor (85) is arranged in the central cooling cavity (82), and the temperature sensor (85) is fixedly arranged at one end of the electrode (8) close to the handle (1).
  8. 8. A method of using a controlled sequence elongated sheath for a radio frequency catheter according to any one of claims 1-7, comprising the steps of: s1, performing preoperative preparation, namely checking the integrity of the device and the smoothness of a catheter main tube (5); S2, introducing and positioning a catheter main tube (5), introducing the catheter main tube (5) into a target area through vessel puncture under the guidance of an image, controlling a bending section on the catheter main tube (5) through a handle (1), gradually adjusting the distal end form of the catheter main tube (5) to be attached to an anatomical structure, and then locking the bending form to ensure that the catheter main tube (5) is stable and not displaced; S3, performing contact confirmation, namely confirming that the electrode (8) is in good contact with the tissue through impedance detection, and then starting a cooling liquid pouring system to pre-pour physiological saline to ensure that micropore seepage is normal; s4, executing an ablation procedure, setting radio frequency power, ablation time and cooling flow rate, starting a PID temperature control system, detecting the surface temperature of the electrode (8) in real time, observing impedance change, automatically reducing power when the sudden change is more than 30%, and preventing carbonization, wherein in the process, the bending angle of the catheter main pipe (5) can be synchronously adjusted to optimize the contact surface of the electrode (8) and tissues; S5, performing ablation post-treatment, stopping radio frequency output, maintaining cooling and pouring for a plurality of seconds to reduce local temperature, then contacting with bending locking of the catheter main pipe (5), gradually withdrawing from the body, checking whether tissue adhesion and ceramic damage exist on the surface of the electrode (8), and recording ablation parameters and effects.

Description

Controllable sequence bending sheath tube for radio frequency catheter and method Technical Field The invention relates to the technical field of radio frequency ablation, in particular to a controllable sequence bending sheath tube for a radio frequency catheter and a method thereof. Background The radiofrequency ablation (RFA) technology has become a standard operation type in the fields of arrhythmia treatment, tumor ablation and the like, but the problems of tissue carbonization, limited ablation depth and the like of the traditional electrode restrict the clinical effect of the traditional electrode for a long time. Literature evidence shows that the cooling radio frequency ablation has a significantly improved therapeutic effect on terminating ventricular tachycardia (isthmus ablation success rate is improved from 54% to 89%, p=0.003), and the transfusion rate of the saline cooling radio frequency coagulation device in hepatectomy is only 3.5%, which is significantly better than that of the traditional method. These clinical data reveal the core value of active cooling techniques by precise temperature control to achieve an effective ablative temperature gradient of 80-95 ℃ in deep tissues while maintaining temperatures below 60 ℃ at the electrode-tissue interface. The prior art routes mainly include internal cooling electrodes (by circulating a cooling fluid through the catheter), perfusion electrodes (by spraying saline onto the tissue surface), and ICP electrodes where the two are combined. However, CT imaging studies show that the perfusion electrode has risks of serious peripheral physical damage, portal qi accumulation and the like, and pure internal cooling is limited by the thermal conductivity of the electrode material (platinum 10.6 mu omega cm, gold is only slightly better than 0.1-0.7 mm focus increment), so that the bottleneck of cooling efficiency is difficult to break through, and the traditional jet perfusion is easy to cause local supercooling and fluid disturbance, so that a controlled sequence bending long sheath tube for a radio frequency catheter and a using method based on the long sheath tube are needed. Disclosure of Invention The invention aims to provide a controllable sequence bending sheath tube for a radio frequency catheter and a method thereof, which are used for solving the problems in the background technology. The controllable sequence bending sheath tube for the radio frequency catheter comprises a handle, wherein a guide wire cavity, a connector and a perfusion cavity are arranged at the rear end of the handle, a catheter main tube is arranged at the front end of the handle, a size marking ring is arranged at the middle section of the catheter main tube, a tip is arranged at one end, far away from the handle, of the catheter main tube, and an electrode is arranged on the catheter main tube and positioned between the size marking ring and the tip. Preferably, the electrode comprises a conductive layer, the conductive layer is fixedly arranged in the catheter main pipe and positioned at one end close to the tip, the conductive layer is in a cylindrical structure, the conductive layer is a substrate formed by ceramics, aluminum oxide-based composite ceramics is selected as a material, a continuous metal layer is formed on the outer layer of the ceramics through magnetron sputtering, the metal layer adopts platinum iridium alloy as a material, and a plurality of micropores are formed on the conductive layer. Preferably, the conducting layer is provided with an anode and a cathode, the anode is divided into two parts, and is respectively and fixedly arranged at two ends of the conducting layer, the two parts are communicated through the conducting layer, the cathode is fixedly arranged in the middle of the conducting layer, an insulating layer is arranged between the inner wall of the cathode and the outer wall of the conducting layer, and a plurality of micropores are formed in the anode and the cathode and aligned with the micropores on the conducting layer. Preferably, a central cooling cavity is arranged in the electrode, and the central cooling cavity is communicated with micropores on the conductive layer, the positive electrode and the negative electrode. Preferably, one end of the electrode, which is close to the handle, is provided with a plurality of liquid supply pipelines, one end of the electrode is positioned in the central cooling cavity, and the other end of the electrode is positioned in the catheter main pipe, and the catheter main pipe is communicated with the central cooling cavity through the liquid supply pipelines. Preferably, a return pipeline is arranged in the central cooling cavity, a liquid inlet of the return pipeline is positioned at one end of the inner part of the central cooling cavity far away from the handle, and a liquid outlet of the return pipeline is positioned outside one end of the electrode close to the handle and is positioned i