WO2005087123A1

WO2005087123A1 - Radio-frequency ablation electrode

Info

Publication number: WO2005087123A1
Application number: PCT/CN2005/000279
Authority: WO
Inventors: Hongkui Wang
Original assignee: Hongkui Wang
Priority date: 2004-03-12
Filing date: 2005-03-08
Publication date: 2005-09-22
Also published as: CN2722849Y

Abstract

A Radio-frequency ablation electrode for treatment of tumors comprises a needle tip (11), sub needles (12), a needle stem (14) and a handle (18). Thermal couples (120) are attached to the tips of the sub needles( 12) and gear clusters (26, 27) are located inside of the handle (18) for winding the sub needles (12). The tips of the sub needles (12) are conductive, and the other parts of the sub needles (12), the needle tip (11) and the needle stem (14) are coated with insulation layers. The sub needles can be fully deployed to form an ellipsoid whose longest diameter is no less than 5 cm. The length of the handle can be less than 10 cm.

Description

Radio frequency ablation electrode

Technical field

The invention relates to a radiofrequency ablation electrode, in particular a multipolar radiofrequency tumor ablation electrode capable of measuring the treatment temperature at each point on the edge of a tumor in real time and accurately. technical background

At present, there are two types of multi-polar radiofrequency tumor ablation electrodes at home and abroad: one is not equipped with a temperature measurement sensor. Since this type of ablation electrode cannot control the temperature, the surface of the electrode will be carbonized in clinic. This makes needle removal difficult; although another type of ablation electrode has a thermocouple for temperature measurement, the temperature measurement points are few (up to 5 points), so the treatment temperature at various points on the edge of the tumor cannot be monitored in real time. The cancer cells at the edge of the tumor are the most active. If the treatment temperature at each point of the edge of the tumor cannot be accurately measured in real time, the doctor cannot know the effect of the treatment accurately, and therefore cannot determine whether other follow-up treatments are needed.

In addition, for the treatment of large masses larger than 4 cm in diameter, if radiofrequency ablation acupuncture is used, a multi-target superposition method must be used. This method often misses some lesions and makes the treatment incomplete. The best way to solve this problem is to increase the ablation diameter by single target treatment, but this will increase the output power of the ablation source, which is very detrimental to the patient and electromagnetic compatibility. Therefore, how to increase the ablation diameter without increasing the output power of the ablation source is a major problem to be solved urgently in radiofrequency ablation treatment.

For example, U.S. Patent No. 6,379,353B1 discloses a device and method for treating tissue with multiple electrodes, which enables the electrodes to maintain a uniformly distributed shape before and during insertion into the tissue, thereby enabling uniform heating of the tissue. The device of the present invention is a probe system for heating and ablating tissue. The system includes a cannula having a plurality of electrode assemblies capable of reciprocating in the cannula. The electrodes of the device have an elastic memory capability, and when the electrodes are pushed out of the sleeve, they have a radially outward bow shape. The electrodes are housed in an annular cladding at even circumferential intervals, the cladding being defined by the outer surface of a central piece located in the inner cavity of the sleeve and the inner surface of the inner cavity of the sleeve. The sleeve is limited, so when it is inserted into the tissue, it can relatively maintain the arrangement form before insertion, so that the electrodes are relatively uniformly distributed in the tissue. The patent improves the distribution of the electrodes when they enter the tissue, but does not address the issue of whether the electrodes can effectively kill cancer cells during treatment. As another example, Chinese Invention Patent Application Publication CN1525839A (corresponding to International Publication WO2002 / 089686) discloses an invention named "RF tissue ablation device and method". The technical problems to be solved are incomplete ablation, small ablation volume, and tissue drying and carbonization or prolonged ablation time. To this end, the invention proposes to use a conductivity-enhancing solution to deliver electromagnetic energy to produce a faster, larger and consistent solution than usual methods. Ablation volume. And try to solve the problem of blocking the injection cavity by the tissue around the electrode. Its equipment includes multiple RF ablation electrodes and multiple sensor elements, each of which can be deployed or retracted in the tissue to be ablated. A control in the device is operatively connected to the electrode and is used to supply RF power to the electrode to produce advancement from the individual electrode ablation area to fill a combined electrode Ablation volume of tissue ablation. The electrode is a hollow needle electrode through which a conductive liquid is injected into the tissue. The sensor element is slender and is used to determine the degree of tissue ablation by measuring the impedance of the tissue, by measuring the temperature of the tissue, or by measuring the optical properties of the tissue. However, the invention cannot monitor the treatment temperature of the tumor edge in real time.

In addition, the operation handles of existing ablation electrodes are too long, especially when increasing the expanded length of the sub-needle (increasing the ablation diameter), the operation handles must be lengthened. In this way, when CT-guided treatment is used, those obese patients will It cannot enter the CT window, so it is meaningful to shorten the length of the ablation electrode operation handle. Summary of the invention

In view of the foregoing shortcomings of the prior art, the present invention is specifically proposed to achieve the following objectives:

An ablation electrode with a large ablation diameter and smaller required RF source output power is provided. The abdomen needle of the ablation electrode is fully deployed to form a spheroid with a diameter of not less than 5 cm, and the largest spheroid has a diameter of 12 cm. Therefore, large tumors can be ablated only once without omission. And according to the shape and location of the mass, the sub-needle can be divided into two groups and deployed separately to adjust the length of the sub-needle deployment, so that "conformal" treatment can be performed.

An ablation electrode with a longitudinal length of the operation handle of less than 10 cm is provided in order to allow CT guided puncture and treatment of obese patients.

In addition, during the radiofrequency ablation treatment of the patient, the treatment temperature of each point on the edge of the tumor can be measured in real time (the distance between the temperature measurement points can be less than lcm). Provide scientific basis for the evaluation of postoperative efficacy. If there is a canine blood vessel somewhere on the edge of the tumor, the treatment temperature near the blood vessel may not reach the treatment temperature, but after the doctor knows this, it is possible to work out other follow-up treatment plans, which is also very important.

To achieve the above object, the present invention provides a radio frequency ablation incision electrode, which includes a needle tip, a sub-needle, a needle rod, an operating handle, a lead cable and a multi-core plug. When all the sub-needle are fully deployed, the long diameter is not less than 5 cm. Oblate.

Preferably, the plurality of sub-needle is divided into two groups of equal or unequal, and the ends of the two sub-needle are wound in the narrow grooves of the outer edges of the left and right internal gears in the operation handle.

A pinion can also be set in the internal gear, and a knob is mounted on the pinion's shaft.

An anti-swelling ring or a trapezoidal chain can also be provided on the outer edge of the internal gear.

Preferably, the needle tip and the needle bar are spaced apart to form a sub-needle guide seam, and the two sets of sub-needles are unfolded or retracted separately or simultaneously from the sub-needle guide seam.

In addition, a sub-needle guide seam adjusting knob can be installed on the operation handle, which adjusts the width of the sub-needle guide seam. Preferably, the tips of all the sub-needles are equipped with a thermocouple.

Moreover, 1-3 cm of the tips of all the sub-needle is conductive, the other parts of the sub-needle and the needle tip, the needle bar There are insulation layers on it.

In addition, the operation handle is also equipped with a clock-shaped sub-hand extended length dial and pointer. BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described in detail below with reference to the accompanying drawings. In the drawings:

FIG. 1 shows an outer shape of a radio frequency ablation electrode with a cutting edge needle expanded according to a first embodiment of the present invention;

FIG. 2 shows a cross-sectional view of an operating handle of a radio frequency ablation edge electrode according to a first embodiment of the present invention;

Fig. 3 shows a sectional view of a needle tip, a needle tip link and a terminal post according to the first embodiment of the present invention; Fig. 4 shows a combined view of a sub-needle and a temperature measuring thermocouple according to the first embodiment of the present invention; Fig. 5 Fig. 6 shows a working state of the sub-needle guide seam adjusting button according to the first embodiment of the present invention; Fig. 6 shows a sectional view of the sub-needle guide seam adjusting button according to the first embodiment of the present invention; A cross-sectional view of the plug of the first embodiment of the invention;

8 shows a cross-sectional view of a needle bar fixing post according to a first embodiment of the present invention;

Fig. 9 shows an external view of an anti-swelling ring according to a first embodiment of the present invention;

FIG. 10 shows a structural diagram of a substrate according to a first embodiment of the present invention;

FIG. 11 shows a structural diagram of an operation handle according to a first embodiment of the present invention;

FIG. 12 shows an external view of a radio frequency ablation edge electrode sub-needle according to a second embodiment of the present invention after it is deployed;

FIG. 13 shows a cross-sectional view of an operating handle of a radio frequency ablation edge electrode according to a second embodiment of the present invention;

FIG. 14 shows the outline of a needle electrode rod for a radio frequency ablation cutting edge electrode according to a second embodiment of the present invention; FIG. 15 shows a needle point, a medicine injection tube and a drug injection for a radio frequency ablation cutting edge electrode according to a second embodiment of the present invention Component drawing of mouth;

FIG. 16 shows a combined structural diagram of a radio frequency ablation cutting edge electrode needle, a temperature measuring thermocouple, and a multi-core plug according to a second embodiment of the present invention;

FIG. 17 shows a working state diagram of a guide slit adjustment button for a radiofrequency ablation incision edge electrode needle according to a second embodiment of the present invention; FIG.

FIG. 18 shows a cross-sectional view of a needle guide slit adjustment button of a radio frequency ablation incision edge electrode according to a second embodiment of the present invention;

19 is a structural diagram of a radio frequency ablation edge electrode gear substrate according to a second embodiment of the present invention;

FIG. 20 shows the structure of an internal gear of a radio frequency ablation edge electrode according to a second embodiment of the present invention Figure;

FIG. 21 shows a structure diagram of a radio frequency ablation edge electrode pinion according to a second embodiment of the present invention;

FIG. 22 shows a trapezoidal chain diagram of a radio frequency ablation cutting edge electrode according to a second embodiment of the present invention; FIG. 23 shows a structural diagram of an outer guide rail of a radio frequency ablation cutting edge electrode trapezoidal chain according to a second embodiment of the present invention;

Fig. 24 shows a structure diagram of a radio frequency ablation edge electrode operation handle housing according to a second embodiment of the present invention.

Throughout the drawings, the same reference numerals indicate the same or similar components or parts. The symbols used in the figure are as follows:

1: RF ablation incision electrode 18 Operation handle

7 Gear base 181 Operating handle housing

9 Anti-swell ring 182 Needle bar seat

11 Needle tip 183 Lead post

111 Needle tip 184 Semi-circular hole

112 Needle tip hole 19 Injection nozzle

113 Tip Tip 20 Lead Cable

12 sub-pins 21 multi-pin plug

120 Thermocouple 22 Needle Tip Link

121 Thermocouple Lead 23 "Z" Frame

122 Sub-pin end 24 Cannulated screws

13 Needle guide slot 25 Gear base plate

14 Needle bar 251 Pinion shaft hole

140 Needle link 252 Internal gear shaft hole

141 Needle bar cover 253 Needle bar cover fixing hole

142 Needle bar outer end 26 Internal gear

143 Needle link fixing block 261 Narrow groove

145 Needle bar fixing post 262 Needle end fixing hole

146 Needle bar housing proximal 27 Pinion

15 Needle guide adjustment knob 28 Trapezoidal chain

151 Universal nut 281 Anti-swell bar

152 knob neck 282 flexible line

16 knobs 29 trapezoidal chain anti-swell ring

17 Sub-needle extended length dial 291 Internal gear center shaft hole 171 Pointer 292 Internal gear gluing groove

30 medium gear

detailed description

First, a radio frequency ablation electrode according to a first embodiment of the present invention will be described in detail with reference to Figs. When the radiofrequency ablation electrode of the present invention is used to treat a tumor, the tumor edge is mainly inactivated, rather than the entire tumor is removed.

As shown in FIG. 1, the radio frequency ablation edge electrode 1 according to the first embodiment of the present invention mainly includes: a needle tip 11, a sub needle 12, a needle rod 14, a sub needle guide slit adjustment button 15, an operation handle 18, and a lead cable 20和 Multicore plug 21. The number of the sub-pins 12 may be multiple, such as 6-14. The multi-core plug 21 shown in the figure is two, but the number can be changed according to the actual situation.

The needle tip 11 may be made of stainless steel, and the needle tip 111 is generally formed into a conical or triangular needle shape. The function of the needle tip 11 is to percutaneously penetrate the tumor tissue. It should be noted that the conical needle tip 111 causes less damage to the patient, and it is not easy to produce pneumothorax when treating lung tumors.

As shown in FIG. 2, the proximal ends of the 6 to 14 needles 12 are divided into two groups of left and right, which are respectively wound in the narrow grooves in the outer edges of the left and right internal gears 26 in the operating handle 18. In order to prevent the sub-needle 12 from expanding outward from the outer edge of the internal gear 26 during the deployment process, an anti-swell ring 9 is provided on the outside of the two internal gears 26. As shown in FIGS. 9 and 10, the anti-swell ring 9 may Fixed with the base plate 7, the notch of the anti-swelling ring 9 enables the proximal end of the sub-needle 12 to be unfolded or retracted to the needle bar 14.

As shown in FIG. 2, each of the internal gears 26 is provided with the same three small gears 27 and a middle gear 30. The function of the middle gear 30 is to engage the two internal gears 26 with each other, so that the left and right two The group needle 12 can be expanded or retracted at the same time. A knob 16 and a pointer 171 are mounted on the shaft of the middle pinion 27. If the left and right sub-pins 12 are to be unfolded or retracted separately, the middle gear 30 is to be removed, and the ends of the two shafts of the left and right middle pinions 27 are equipped with a knob 16 and a pointer 171, respectively. The sub-needle deployment operation handle 18 is provided with a clock-shaped, watch-shaped sub-needle deployment length dial 17 and a pointer 171.

As shown in FIG. 3, the needle tip 11 and the connecting rod 140 are fixed to the needle tip connecting rod fixing block 143 by various methods such as welding and bonding. The needle tip link 140 may be made of a stainless steel tube. The lead post 183 is made of an insulating material, and small circular holes 154 can be provided on both sides of the center, so as to place the thermocouple lead 121 and the transmission line of the radio frequency signal.

FIG. 4 shows a detailed structure of the sub-needle 12: The sub-needle 12 includes a temperature measuring thermocouple 120 and a lead 121, and the temperature measuring thermocouple 120 is located at the tip of the sub-needle 12. 6-14 sub-pins 12 can be welded together. When the cross section of the sub-pin 12 is a hollow circle, the outer diameter of the circle should be slightly smaller than the inner diameter of the needle bar jacket 141. The thermocouple lead 121 is led out through a lead post 183 and is connected to the multi-core plug 21. In this embodiment, only 1 to 3 cm of the temperature measuring thermocouple 120 on the sub-needle 12 is conductive, and other parts of the sub-needle 12 and the needle tip 11 and the needle bar 14 are provided with an insulating coating. When 6-14 sub-needles 12 are fully deployed, the tip of the sub-needle 12 reaches the The distances are less than 2 cm, so they can form oblate spheres. In this case, when the longitudinal length of the operation handle 18 is less than 10 cm, the length of the sub-needle 12 can be extended to be more than 7 cm. Therefore, when all the sub-pins 12 are fully unfolded, they can form oblate spheres with a length of not less than 5 cm.

As shown in FIG. 1, FIG. 5, and FIG. 8, the needle bar 14 is composed of a needle bar jacket 141 and is fixed to the lead post 183 through a needle bar fixing post 145. As shown in FIG. 8, the inside of the needle bar fixing post 145 is made into a threaded hole for connecting with the sub-needle guide slit adjusting button 15 described below.

As shown in FIG. 5 and FIG. 6, the sub-needle guide seam adjusting button 15 is composed of a hollow screw that is screwed into the internally threaded hole of the needle bar fixing post 145. It can be seen from FIG. 5 that there is a thickened tube 23 outside the needle bar 14. As shown in FIG. 5 and FIG. 7, the lower end of the thickened tube 23 is plugged with the lower mouth of the plug 22 screw, so the needle bar 14 can be moved up and down by the guide slot adjustment button 15, so the size of the sub-needle guide slot 13 can be adjusted. .

As shown in FIG. 1, FIG. 2 and FIG. 11, the operation handle 18 includes: a knob 16, a sub-needle extended length dial 17, a pointer 171, a plurality of gears 27 and an internal gear 26. The knob 16 and the sub-needle extension length dial 17 are mounted on the operating handle 18. The outer shell of the dial 17 is transparent, and the pointer 171 is fixed on the shaft of the intermediate pinion 27. The disc 17 is accurately read out, and the temperature measuring thermocouple 120 of the sub-pin 12 and the tip 11 is connected to the multi-core plug 21 through a thermocouple lead 121.

10 and 11 illustrate the configuration of the gear substrate 7 and the operation handle 18. When assembling, the gear base plate 7 is mounted on the housing of the operating handle 18 to form a complete operating handle 18 containing gears.

In clinical application, pierce the needle tip 11 to the deepest edge of the mass, and then unfold the guide seam 13. Turn the knob 16 to expand the sub-needle 12 by about 1 cm, and then power on to raise the temperature of each temperature measurement point to 60 ° C. -90 ° C, and so on until the needle 12 is fully extended. During the treatment process, the computer of the ablation system records the temperature of the famous point and then displays the treatment temperature of each part of the tumor edge with a three-dimensional color chart. If the distance between the tip of each sub-needle 12 is greater than 1 cm when the sub-needle 12 is unfolded halfway, the sub-needle 12 can be completely retracted after the above treatment is completed, and the needle handle is rotated by one while maintaining the position of the needle tip 11 unchanged. For a small angle, repeat the above treatment. Setting the number of sub-pins 12 to N for the above-mentioned treatment is equivalent to using RF ablation incision electrode 1 with NXM sub-pins 12 as a target treatment. For example, when the number of sub-needle 12 is 10 and the above three treatments are performed, it is equivalent to perform radiofrequency ablation incision electrode 1 with 30 sub-needle 12 for target treatment.

A radio frequency ablation electrode 1 according to a second embodiment of the present invention will be described below with reference to Figs. 12-24. As shown in FIG. 12 and FIG. 13, the radio frequency ablation cutting edge electrode 1 according to the second embodiment of the present invention mainly includes: a needle tip 11, a sub-needle 12, a needle bar 14, a sub-needle guide slit adjustment button 15, an operation handle 18, The lead cable 20 and the multi-core plug 21.

The number of sub-pins 12 may be multiple, such as at least 6-14. As shown in FIG. 12, the tip of the sub-needle 12 is equipped with a temperature measuring thermocouple 120, and only the 1-3 cm section of the sub-needle 12 equipped with the temperature measuring thermocouple 120 is conductive, and other parts of the sub-needle 12 And the needle tip 11 and the needle bar 14 are coated with an insulating layer. When the needle 12 When unfolding, the distance between the tip of each sub-needle 12 and the needle bar 14 is less than 2 cm, so as to form an oblate shape. As shown in FIG. 13, the plurality of sub-needles 12 are divided into two groups with equal or unequal numbers of left and right. In this case, when the longitudinal length of the operation handle 18 is less than 10 cm, the length of the sub-needle 12 can be extended to be more than 7 cm. Therefore, when all the sub-pins 12 are fully deployed, they can form oblate spheres with a diameter greater than 5 cm.

As shown in Figs. 12 and 13, two sets of sub-needles 12 can be unfolded and retracted from the sub-needle guide slits 13 by rotating the left and right small pinions 27, respectively. There are two multi-core plugs 21 shown in FIG. 12, but the number can be changed according to the actual situation.

The knob 16 and the sub-needle extended length dial 17 in FIG. 12 are arranged correspondingly on the upper and lower sides of the operation handle 18. The expansion / retraction of the sub-needle 12 is controlled by the corresponding knobs 16, and the length of the expansion is also indicated by the corresponding dial 17 and pointer 171.

• FIG. 13 is a cross-sectional view of the operation handle 18 of the radio frequency ablation incision edge electrode 1. From this figure, the mutual connection relationship of the main components of the ablation incision edge electrode 1 can be understood in detail.

As shown in the figure, after the needle 12 passes through the needle bar housing 141, it is divided into two groups of equal left and right. Hole 262 (refer to FIG. 20), and pass through the fixing hole 262 in the groove to the central axis of the internal gear 26.

The lead wires 121 of the temperature measuring thermocouples of each of the sub-pins 12 and the RF signal wires pass through the lead posts 183 of the operating handle 18 (refer to FIG. 24) to form a lead cable 20, and the lead cable 20 is connected to the multi-core plug 21. This structure can greatly shorten the longitudinal length of the operating handle 18. When CT is used to locate the mass, the shortening of the operating handle 18 is very important, especially for those who are more obese.

As can be seen from FIG. 13, the knob 16 can be mounted on one end of the pinion 27 shaft, and the pointer 171 on the sub-needle extended length scale 17 is also mounted on the other end of the central shaft of the internal gear 26.

As shown in FIG. 15, the needle tip 11 is generally made of stainless steel, and the needle tip 111 is generally formed into a conical or triangular needle shape. The function of the needle tip 11 is to penetrate into the tumor tissue percutaneously. It should be noted that the conical needle tip 111 causes less damage to the patient, and it is not easy to generate pneumothorax when treating lung tumors. The needle tip 11 may be provided with 3-4 small holes 112, which communicate with the needle tip link 22 and the injection nozzle 19 shown in FIG. During the treatment, a normal saline or other medicinal solution can be injected into the tumor tissue through the injection nozzle 19, the needle link 22 and the small hole 112 on the needle tip.

The needle 12 is generally made of a flexible stainless steel tube. FIG. 16 shows the detailed structure of the sub-needle 12. The stainless steel tube has a temperature measuring thermocouple lead 121, and the temperature measuring thermocouple 120 is located at the tip of the sub-needle 12. 6-14 sub-pins 12 can be divided into two equal groups and welded together. The cross section of the sub-pin 12 after welding is also a hollow circle, and the outer diameter of the circle should be slightly smaller than the inner diameter of the needle bar jacket 141. The thermocouple lead 121 is led out through a lead post 183 and is connected to the multi-core plug 21.

The expanded shape of the sub-pin 12 is made according to the assembly book. To increase its elasticity, a similar Manufacturing process of general spring. The long diameter of the oblate sphere formed by the development of the sub-needle 12 is related to the thinness of the sub-needle 12 itself. The thicker it is, the larger the long diameter of the oblate sphere.

The size of the sub-needle guide seam 13 is related to the oblate long diameter. The smaller the sub-needle guide seam 13 is, the smaller the oblong long diameter is.

Of course, to increase the size of the oblate long diameter, it is necessary to lengthen the extended length of the pin 12; if the handle is operated by the traditional push column method, the longitudinal length of the operation handle will be too long. In the present invention, the sub-needle 12 is divided into two groups, which are respectively wound on the outer wires of the two internal gears 26 in the operation handle 18, thereby greatly shortening the longitudinal length of the operation handle.

The needle bar jacket 141 shown in FIG. 14 is generally made of a stainless steel tube with a diameter of 1.2 to 2.0 mm, and is coated with an insulation layer and marked with a scale to indicate the depth of penetration into the tissue. The distal end 142 of the needle bar jacket 141 and the distal end 113 of the needle tip 11 form a sub-needle guide seam 13, the width of the guide seam 13 is adjusted by the sub-needle guide seam knob 15 installed on the operation handle 18, and the diameter of the sub-needle 12 after the expansion is mainly Depends on the width of the guide seam. It can be seen from FIG. 19 that the proximal end 146 of the needle bar housing 141 and the needle bar housing fixing hole 253 on the gear base plate 25 are welded together. As can be seen in Figure 15, the needle tip 11 and the injection tube 22, the "Z" -shaped frame 23, the hollow screw 24 and the injection nozzle 19 should be firmly connected to each other. The role of the "Z" -shaped frame 23 is to prevent the needle tip 11 from rotating when the size of the guide slit 13 is adjusted by the guide slit adjusting button 15. The two ends of the “Z” -shaped frame 23 are limited by the inner cavity width of the operating handle housing 181.

As shown in FIG. 18, the sub-needle guide seam adjusting button 15 is a combination of a universal nut 151 and a hollow cylindrical knob 16, which should be firmly connected with each other. The neck 152 of the knob is embedded in the upper and lower operation handle housing 151. Inside the semi-circular hole 154, as shown in FIG.

FIG. 17 is a combination of FIG. 18 and FIG. 15. It can be seen from FIG. 17 that when the sub-needle guide slit knob 15 is rotated, because “V, the shaped frame 23 and the sub-needle guide slit knob 15 are limited by the upper and lower operation handle housing 181, the assembly shown in FIG. 15 can only be displaced up and down The needle bar cover 141 is fixed to the needle bar cover fixing hole 253 on the gear substrate 25. In this way, the sub-needle guide seam 13 can change its size. The sub-needle guide seam 13 is the key to determine the diameter of the sub-needle 12 after it is unfolded. The size of the guide needle guide slit 13 can be adjusted to make the long diameter of the sub needle 12 expanded to 5-12 cm, and the tip of each sub needle 12 is close to the oblate radio frequency ablation electrode 1 of the needle shaft 14.

FIG. 19 is a configuration diagram of the gear substrate 25. There are two upper and lower gear base plates 25 in the operating handle 18 of each radio frequency ablation incision edge electrode 1, and there are two pinion shaft holes 251 and two internal gear shaft holes 252. The operation handle housing 181 is connected.

20 and 21 are structural diagrams of the internal gear 26 and the pinion 27. There is a narrow slot 261 in the middle of the outer edge of the internal gear 26. The end of the sub-pin 12 is wound in this slot. The width of the narrow slot 261 should be N / 2 times the diameter of the sub-pin 12, where N is the number of the sub-pin 12.

FIG. 22 is a structural diagram of a trapezoidal chain 28. The trapezoidal chain 28 includes an anti-swelling strip 281 and a flexible wire 282. The anti-expansion bar 281 is preferably made of metal, and the flexible wire 282 is made of high-strength and flexible nylon thread. The anti-expansion bar 281 and the flexible wire 282 should be firmly connected. The A end of the trapezoidal chain 28 and a group of sub-pins 12 The proximal ends are fixed together at the sub-pin fixing holes 262 of the internal gear 26, and the trapezoidal chain 28 can be tightly wound on the outer edge of the internal gear 26. The internal gear 26 and the external guide rail 29 of the trapezoidal chain shown in FIG. together. It can be seen from FIG. 2 that when the sub needle 12 is fully deployed, all the anti-swelling strips 281 of the trapezoidal chain 28 will gather near the lead post 183 of the operation handle housing 181, and when the sub needle 12 is fully retracted, the anti-swelling of the trapezoidal chain 28 The strips 281 are evenly distributed on the outer edge of the ring gear 26.

FIG. 23 is a structural diagram of the outer guide rail 26 of the trapezoidal chain. It is fixed with the internal gear 26 so that the internal gear 26 has a solid central shaft hole 291. Its main purpose is to press the trapezoidal chain 28 during the development of the sub-needle 12 to prevent the sub-needle 12 from passing through the narrow groove 261. Pop out.

FIG. 24 is a structural diagram of the operation handle housing 18. It is combined with the gear base plate 25, the internal gear 26, the pinion 27, the trapezoidal chain 28, the trapezoidal chain outer guide 29, the knob 16 and the sub-needle extended length dial 17 to form the operation handle 18 of the RF ablation edge electrode 1 (see figure 12 and Figure 13).

FIG. 12 is an external view of a radio frequency ablation cut-edge electrode sub-needle of the second embodiment after being unfolded; in order to see the reading of the sub-needle expanded length dial 17, the operation handle housing corresponding to the sub-needle expanded length dial is transparent Made of materials such as plexiglass plates. The hand 171 is fixed on the central axis of the internal gear 26, and the length of the sub-hand 12 can be read out accurately through the hand 171 and the dial 17. The thermocouple 120 of the needle tip 122 is connected to the multi-core plug 21 through a thermocouple lead 121.

In clinical application, puncture the needle tip 11 to the deepest edge of the mass, turn the knob 16, first expand the sub-needle 12 by about 1 cm, and then power on to raise the temperature of each temperature measurement point to 60 ° C-9 (TC _After the sub-needle 12 is further increased by 1 cm, power is applied to increase the temperature of each temperature measurement point to 60 ° -9 (TC, and so on, and so on, until the sub-needle 12 is fully expanded. During the treatment process, the computer of the ablation system will The temperature of each point was recorded, and the three-dimensional color chart was used to show the treatment temperature of each point of the tumor edge.

If the distance between the sub-needle tips 122 is greater than 1 cm when the sub-needle 12 is unfolded by half the length, the sub-needle 12 can be completely retracted after completing the above treatment, and the sub-needle operation handle can be maintained while keeping the position of the needle tip 11 unchanged. 18 Rotate a small angle, and then perform the above treatment. Assuming that the number of sub-needles 12 is N, performing the above-mentioned treatments M times is equivalent to using radio frequency ablation incision electrode 1 having NXM sub-needles 12 for one treatment. For example, when the number of sub-pins is 10 and the above three treatments are performed, it is equivalent to performing one treatment with the radiofrequency ablation incision electrode 1 having 30 sub-pins 12.

Although the two preferred embodiments of the present invention have been described in detail above, those skilled in the art should understand that various modifications, additions and improvements can be made without departing from the scope and spirit of the present invention as defined by the appended claims. Instead. For example, one or more components in the second embodiment may replace the corresponding components of the first embodiment, or a combination of the components of the first embodiment and the components of the second embodiment may constitute a new radiofrequency ablation edge electrode.

Claims

Claim

A radio frequency ablation electrode comprising a needle tip (11), a sub-needle (12), a needle bar (14), an operation handle (18), a lead cable (20), and a multi-core plug (21), characterized in that: After all the sub-pins (12) are fully unfolded, they form oblate spheres with a diameter of not less than 5 cm.

The radio frequency ablation electrode according to claim 1, characterized in that the plurality of sub-needles (12) are divided into two groups of equal or unequal, and the ends of the two sub-needles (12) are wound around the operation handle (18) Inside the narrow grooves (216) on the outer edges of the two inner gears (26).

The radio frequency ablation electrode according to claim 2, characterized in that the internal gear (26) is further provided with a pinion (27), and a knob (16) is mounted on a shaft of the pinion (27).

The radio frequency ablation electrode according to claim 2, characterized in that the outer edge of the internal gear (26) is provided with an anti-swelling ring (9) or a trapezoidal chain (28).

The radio frequency ablation electrode according to claim 1, characterized in that a sub-needle guide seam (13) is formed between the needle tip (11) and the needle shaft (14), and two sets of sub-needles (12) are guided from the sub-needle guide seam (13) Expand or retract separately or simultaneously.

The radio frequency ablation electrode according to claim 5, characterized in that a sub-needle guide slit adjusting button (15) is installed on the operation handle (18), which adjusts the width of the sub-needle guide slit (13).

The radio frequency ablation electrode according to claim 1, characterized in that the tip ends of all the sub-needles (12) are equipped with temperature measuring thermocouples (120).

The radio frequency ablation electrode according to claim 7, characterized in that 1-3 cm of the tips of all the sub-needles (12) are conductive, and other parts of the sub-needle, the needle tip (11), and the needle shaft (14) There are insulation layers on it.

The radio frequency ablation electrode according to claim 1, characterized in that the operation handle (18) is equipped with a clock-shaped sub-needle deployment length dial (17) and a pointer (171).