CN-121987328-A - Radio frequency catheter ablation assembly and radio frequency ablation system

CN121987328ACN 121987328 ACN121987328 ACN 121987328ACN-121987328-A

Abstract

The invention discloses a radio frequency catheter ablation assembly and a radio frequency ablation system. The radio frequency catheter is provided with a radio frequency electrode along the length direction of the radio frequency catheter, the electrode is electrically connected with a movable electrode sliding sheet, an electrode length adjusting assembly is arranged in the handle, the movable electrode sliding sheet can move along the length direction of the radio frequency electrode under the action of the movable electrode sliding sheet, the length of the working end of the radio frequency electrode is adjusted, and the sliding sheet is electrically connected with an external power supply when the radio frequency catheter is used. The invention effectively solves the technical problems of the existing ultrasonic-guided lower limb varicose vein catheter radio frequency ablation, can accurately adjust the length of an ablation catheter, avoid length mismatch, integrate a medicine injection function, solve the problem of lack or uneven injection, flexibly adjust the temperature of a working end, reduce the ablation problem, improve the curve and antithrombotic property of a passing blood vessel, reduce the positioning difficulty, reduce the dependence on experience, realize uniform mixing of a hardening agent, simplify the injection operation of a spacer fluid and reduce the influence of capacity difference.

Inventors

LIU LIWEN
XU HUI
HUANG JUNZHE
ZHAO YONGFENG
LIU JIAO
ZHAO XUELI
ZHAO XIAOYU
ZHAO JUNFENG
ZHANG HAIYAN

Assignees

中国人民解放军空军军医大学

Dates

Publication Date: 20260508
Application Date: 20260310

Claims (10)

1. A radiofrequency catheter ablation assembly, characterized by comprising a handle (3) and a radiofrequency catheter (10) connected to the handle (3); the radio frequency catheter (10) is provided with a radio frequency electrode (12), the radio frequency electrode (12) is arranged along the length direction of the radio frequency catheter (10), and the radio frequency electrode (12) is electrically connected with a movable electrode sliding sheet (24); The movable electrode sliding sheet (24) can move along the length direction of the radio frequency electrode (12) under the action of the electrode length adjusting assembly to adjust the length of the working end of the radio frequency electrode (12); When in use, the movable electrode slide (24) is electrically connected with an external power supply.
2. The radio frequency catheter ablation assembly of claim 1, wherein the electrode length adjustment assembly comprises a rotation unit and a pulling unit; The rotating unit comprises a driving shaft (5) and a driving shaft (7), wherein a driving shaft first gear (4) and a driving shaft second gear (16) are arranged on the driving shaft (5), a driving shaft first gear (8) and a driven shaft second gear (14) are arranged on the driving shaft (7), the driving shaft first gear (4) is meshed with the driving shaft first gear (8), the driving shaft second gear (16) is meshed with the driven shaft second gear (14), an adjusting knob (6) is arranged at one end of the driving shaft (5), and the adjusting knob (6) is positioned outside the handle (3); The traction unit comprises an electrode lead (9) arranged on a movable electrode sliding sheet (24) and a traction assembly (28) arranged at the free end of the radio frequency catheter (10), wherein the other end of the electrode lead (9) is wound on a transmission shaft (7), a traction wire (13) is wound on the traction assembly (28), one free end of the traction wire (13) is fixedly connected with the movable electrode sliding sheet (24), the other free end of the traction wire is wound on the transmission shaft (7), and the winding directions of the traction wire (13) and the electrode lead (9) on the transmission shaft (7) are opposite.
3. A radio frequency catheter ablation assembly according to claim 2, wherein the number of teeth of the drive shaft first gear (4) is greater than the number of teeth of the drive shaft first gear (8) and the number of teeth of the drive shaft second gear (16) is less than the number of teeth of the driven shaft second gear (14).
4. The radio frequency catheter ablation assembly according to claim 1, wherein a first indicator light (23) is provided near the movable electrode slide (24) and a second indicator light (29) is provided near the end of the radio frequency electrode (12), and the radio frequency ablation assembly further comprises a control unit in communication with the first indicator light (23) and the second indicator light (29).
5. The radio frequency catheter ablation assembly according to claim 4, wherein a plurality of thermocouples (22) are arranged at positions close to the radio frequency electrodes (12), the thermocouples (22) are communicated with the control unit, in use, the thermocouples (22) transmit detected temperatures to the control unit, the control unit compares the acquired temperatures with preset temperature range values, if the difference between the acquired temperatures and the preset temperatures exceeds a preset threshold range, the output power of the thermocouples (22) is regulated, the adjustment of the ablation temperature is achieved, and after the ablation is finished, the flicker frequency of the first indicator lamp (23) and the second indicator lamp (29) is controlled through temperature feedback of the thermocouples (22).
6. The radio frequency catheter ablation assembly according to claim 1, wherein a drug injection pipeline (18) is arranged in the handle (3), one free end of the drug injection pipeline (18) extends to the tail of the handle (1), the other free end of the drug injection pipeline extends to the end of the radio frequency catheter (10), a drug injection groove (26) is formed in the free end of the drug injection pipeline (18), and a plurality of drug injection holes (27) are formed in the drug injection groove (26).
7. A radiofrequency catheter ablation assembly as claimed in claim 1, characterized in that the radiofrequency electrode (12) is provided externally with an insulating layer (25), the insulating layer (25) being provided externally with an antifriction lubricating anticoagulant coating material.
8. A radio frequency ablation system comprising a radio frequency catheter ablation assembly according to any one of claims 1-7 and an energy generating device electrically connected to the radio frequency electrode (12).
9. The radio frequency ablation system according to claim 8, further comprising a gas quantitative hardener mixer, wherein the gas quantitative hardener mixer comprises a mixing chamber (1023), a mixing gas tank (101) and a plurality of mixing solution injectors are connected to the mixing chamber (1023), and a motor (1018) and a plurality of mixing motion pistons are connected to the mixing chamber (1023).
10. The radio frequency ablation system according to claim 8, further comprising a spacer fluid multi-point injection device comprising an injection needle (209), the free end of the injection needle (209) being provided with a plurality of through holes (2010).

Description

Radio frequency catheter ablation assembly and radio frequency ablation system Technical Field The invention belongs to the technical field of radio frequency ablation equipment, and relates to a radio frequency catheter ablation assembly and a radio frequency ablation system. Background Ultrasonic guided lower limb varicose vein catheter radio frequency ablation is an accurate minimally invasive technique for treating lower limb varicose vein, and the closing of lesion veins by ultrasonic real-time positioning and radio frequency energy has become one of the preferred schemes of international guidelines. The main technical core principle is that the ultrasonic whole process guides puncture and catheter positioning in real time, the radio frequency ablation catheter is accurately fed into the varicose vein cavity, the working end of the radio frequency catheter releases radio frequency energy, the temperature can reach 85-120 ℃, collagen on the vein wall is denatured, contracted and closed, the closed lesion vein is gradually fibrosed and absorbed, blood flows back through the healthy vein, abnormal vein pressure is eliminated from the root, and most tissues outside the fascia cavity need to be changed in temperature (for example, the range of 85-100 ℃ is adjusted). Compared with the traditional high-level ligation stripping operation, laser ablation, hardener injection and other treatment modes of the great saphenous vein, the ultrasonic-guided lower limb varicose vein catheter has the advantages that the radiofrequency ablation catheter has a wound of only 2-3mm, has no surgical incision, does not need to pull blood vessels by a stripper, avoids long-strip scars of legs, has high vascular closure rate, low recurrence rate, low pain level, no scars, high aesthetic degree, high safety and fewer complications, and has great clinical significance and application value in vein ablation. However, there are still a number of clinical limitations of current rf ablation catheters in practical clinical applications: Firstly, the unmatched ablation of the length of the radiofrequency ablation catheter needs to realize the rapid and accurate adjustment of the length of the working end of the ablation catheter due to the different ablation requirements of different areas of the vein blood vessel, so that the ablation times and operation time are reduced, secondly, during the operation of the lower limb vein radiofrequency ablation electrode catheter, the target vascular treatment effect and inflammation complications are enhanced by simultaneously adopting ablation superposition hardening agent and other medicaments for diagnosis and treatment, and in order to reduce the inflammatory reaction of the ablated vascular wall, anti-inflammatory liquid medicine needs to be injected into the inner wall of the ablated vascular cavity, however, at present, part of the ablation catheter is not provided with an intravascular drug injection hole and a drug injection tube, or the arranged drug injection hole structure cannot realize the uniform effect of the anti-inflammatory drug on the periphery of the ablated vascular vein blood membrane, so that the anti-inflammatory drug cannot be administered through a side hole of the radiofrequency ablation catheter or an auxiliary catheter, and in addition, the working end temperature of the conventional lower limb vein radiofrequency ablation catheter is equal to a single fixed value (such as 120/100/80 ℃). However, when the ablation temperature of the catheter electrode is overheated, steam explosion and carbonization are easy to occur, when the temperature is too low, ablation is uneven and treatment fails, and when the catheter is shifted or is in poor contact with the catheter under fixed power, automatic compensation cannot be performed, so that the problems of discontinuous ablation range, poor wall penetration and the like are caused. When the vein radiofrequency ablation catheter adopts a fixed value mode, the lack of closed-loop control on tissue temperature is a fundamental defect, so that energy output is not matched with tissue requirements, and the linkage problems of overheating, uneven ablation, uncontrolled impedance and the like are caused. When the radiofrequency catheter passes through a vein curve, if the friction force of the wall is too large, damage to vein vascular endothelium can be caused, meanwhile, when the surface of an ablation catheter enters into vein vessels of lower limbs, platelets and fibrinogen are easily adsorbed, intrinsic coagulation is started, when the ablation catheter is pushed, the wall of the vein is rubbed, if the friction force is too large, endothelial cells fall off, collagen fibers are exposed, platelet adhesion and aggregation are activated, thrombus formation is caused, and the operation safety of a patient is affected. In addition, during lower limb vein ablation, the hidden thigh boundary safety distance control needs to be place