WO2018006384A1

WO2018006384A1 - Ablation electrode

Info

Publication number: WO2018006384A1
Application number: PCT/CN2016/089278
Authority: WO
Inventors: 李楚武; 邹波; 朱晓林
Original assignee: 四川锦江电子科技有限公司
Priority date: 2016-07-07
Filing date: 2016-07-07
Publication date: 2018-01-11

Abstract

Disclosed is an ablation electrode in the field of ablation for pain, comprising: a flexible tube body (3), which is a flexible tube made of a biocompatible material with openings at two ends, can be bent, and comprises a free end (1); a support part, which extends inside the flexible tube body (3), can be withdrawn through a non-free end of the flexible tube body (3), and has one end thereof capable of extending through the free end (1) of the flexible tube body (3); and an electrode (2), which is arranged at the free end (1) of the flexible tube body (3) and can release radio-frequency energy. The ablation electrode is flexible and elastic, and can be attached better, thereby reducing operation difficulty, enabling a contrast agent to be distributed more uniformly and achieving better puncture effect.

Description

Ablation electrode

Technical field

The invention relates to the field of pain ablation, and in particular to an ablation electrode.

Background technique

Radiofrequency ablation technology is used for nerve therapy, soft tissue injury and reduction of soft tissue pressure between vertebrae, such as trigeminal neuralgia, lumbar disc herniation, etc. Radiofrequency ablation is to insert the puncture needle into the diseased tissue, release RF energy through the electrode needle, and form with the electrode piece. The circuit, the Joule heat generated by the ion conduction current in the biological tissue and the heat generated by the biological tissue in the high frequency electromagnetic field due to the dielectric loss, causes the temperature of the diseased tissue to rise, thereby achieving the therapeutic purpose, the treatment range and the effect and the organization It is related to the temperature being applied, and the temperature is determined by the energy applied, the rate of heating, and the thermal properties of the tissue. Usually, the heating temperature is from 42 ° C to 45 ° C for 30-60 min, which can lead to irreversible denaturation of proteins (including membrane proteins) in cells. When the tissue temperature rises to 60 ° C, the time for the cells to produce irreversible damage will be greatly shortened. When the temperature exceeds 60 ° C, the protein denatures and the cells die for a while, thereby achieving a therapeutic effect.

Traditional puncture needle or blunt needle, because the needle is fixed and curved, can not reach the treatment site very well, such as: the curved shape can not be too large, the curved shape will affect the puncture effect, otherwise it will lead to unsatisfactory contact, affecting the treatment effect Traditional puncture needles can only be unipolar or bipolar ablation. The length of conventional electrodes is fixed at 5mm, 10mm or 15mm. The ablation length and range cannot be controlled during ablation. For multi-point ablation or pulse radiofrequency therapy, multiple punctures need to be inserted. The needle is treated to increase the pain of the patient and increase the difficulty of the operation process; when the nerve root is observed by the contrast agent, the contrast agent of the conventional needle is unevenly distributed.

Summary of the invention

The object of the present invention is to overcome the above-mentioned deficiencies existing in the prior art and to provide a soft and yet Elasticity, better abutment, reduce the difficulty of surgery, more uniform distribution of contrast agent, ablation electrode with better puncture effect.

In order to achieve the above object, the present invention provides the following technical solutions:

An ablation electrode for use in the field of pain ablation, comprising:

a flexible pipe body, which is a hose with two ends formed of a biocompatible material, capable of being bent, including a free end;

a support member, which is disposed in the flexible tube body, is capable of being withdrawn from the flexible tube body from the free end, and one end of which can pass through the free end of the flexible tube body;

An electrode disposed at a free end of the flexible tube body capable of releasing radio frequency energy;

Wherein, the number of the electrodes is greater than or equal to two, and discharge ablation is formed between the electrodes.

In the above aspect, forming a discharge ablation between the electrodes includes: at least one radio frequency current transmitting electrode in the electrode, and at least one radio frequency current receiving electrode. The radio frequency current receiving electrode and the radio frequency current transmitting electrode comprise electrodes having a potential difference between each other at the same instant, and the two electrodes are arranged in cooperation with each other, so that the radio frequency current is applied to the two electrodes and the human body after the electrodes are connected to the radio frequency current. A closed loop is formed between the tissues and at least one closed loop is formed to form a discharge ablation.

The existing ablation technology attaches the back plate to the human skin tissue, and places an ablation catheter on the surface of the tissue that needs to be ablated inside the human body, and transmits the radio frequency current to the human tissue through the ablation catheter and the back plate, which is equivalent to the inner surface and the outer surface of the human tissue. Applying a current, the direction of the current is perpendicular to the surface of the human tissue, and the heating direction is also perpendicular to the surface of the human tissue, so that a certain depth can be ablated, but since the heating is only perpendicular to the surface of the human body, only longitudinal heating, lack of a lateral heating source, The lateral direction of the surface of the human tissue is only heated by heat transfer, and therefore, the lateral heating area is small and the ablation area is small.

The ablation electrode of the present invention is provided with at least two electrodes for transmitting radio frequency to human tissue At current, the RF current forms a closed loop through the electrodes, body tissue, and other electrodes, and at least forms a closed loop. In this way, lateral heating can be performed on the human tissue, and the heating area is increased compared with the existing longitudinal heating, which can quickly ablate a large area of the lesion tissue, save the ablation operation time, and improve the ablation efficiency, thereby reducing the patient's pain and reducing Surgical risk.

In addition, the solution directly sets a plurality of electrodes on the ablation electrode, and the ablation plate can be used without a back plate. After the plurality of electrodes are in contact with the human body tissue, the radio frequency current is transmitted to the body tissue to be ablated through the electrode disposed on the ablation electrode. Thereby ablation is performed, and the ablation plate can be eliminated without a back plate, thus making the device simpler.

The flexible tubular body and the supporting member are used to replace the fixed curved pointed needle or the blunt needle of the prior art, and after the flexible tubular body is reached by the support member, the supporting member is extracted and passed through the flexible tubular body. The hose conveys a contrast agent or a medicament for performing a lower order work, and the puncture effect is better. The flexible tube body is soft and elastic, and the abutment is better, the operation difficulty is reduced, and the flexible tube body has a free end opening, and the contrast is performed. The agent is more evenly distributed and the image effect is more ideal.

As a preferred embodiment of the present invention, the ablation electrode further includes a handle, the flexible tube body is non-free end mounted on the handle, the handle is hollow, and the support member can be simultaneously disposed on the flexible tube body, Inside the handle, the flexible pipe body is hollow, inserted into the support member through the handle, and protrudes from the free end opening of the flexible pipe body to achieve a better puncture effect.

As a preferred embodiment of the present invention, the flexible tube body is further provided with a chamber for passing the support member, the integration degree is higher, the volume of the flexible tube body is reduced, the volume of the ablation electrode is smaller, and the patient is reduced. pain of.

As a preferred embodiment of the present invention, the ablation electrode further includes a temperature sensor mounted on a lower surface of the electrode, the temperature sensor being powered by a temperature sensor wire, the electrode being energized by an electrode lead, a temperature sensor passes through the chamber, and a temperature sensor is mounted to the electrode The way of the lower surface makes the temperature detection more accurate, and the integration is higher, the volume of the flexible tube is reduced, the volume of the ablation electrode is smaller, and the pain of the patient is reduced.

In a preferred embodiment of the present invention, the electrode lead and the temperature sensor lead are wound in the same direction in the flexible tube body, and the handle end is provided with a hole for the electrode lead and the temperature sensor lead to protrude. The electrode lead and the temperature sensor lead extend out of the hole and are connected to the external power source through the plug, and the integration degree is higher, the ablation electrode is smaller in volume, the volume of the flexible tube body is reduced, and the pain of the patient is reduced.

As a preferred aspect of the invention, the electrode is disposed on an outer surface of the free end of the flexible tubular body.

As a preferred embodiment of the present invention, the supporting member is a core, which includes a mounting seat and a mandrel, and the mandrel may be in the shape of a straight shape, a curved shape or a circular arc shape, and is mounted on the mounting seat and worn. The utility model is provided in the flexible pipe body, and the mounting seat can be fixedly mounted on the end of the handle, and the structure is simple and scientific.

As a preferred embodiment of the present invention, the handle end is a pipe body with a thread distributed outside, the mounting seat is provided with an internal thread that cooperates with a thread on the handle, and the mandrel is disposed in the flexible pipe body. The mounting seat cooperates with the handle to realize positioning, and the mounting seat can be rotated and inserted into the handle. When the flexible tubular body enters the patient's body, the mandrel is subjected to tissue pressure and does not cause the mandrel to escape from the handle.

As a preferred embodiment of the present invention, the mandrel is a strip having a hardness greater than that of the flexible hose, and the top portion of the mandrel is a boss having a cross section that is gradually smaller or has a constant cross section, which is easy to puncture. .

As a preferred embodiment of the present invention, the electrode is wrapped around the outer surface of the free end of the flexible tubular body, the number is equal to or greater than one, and the multi-pole ablation can be performed, and only one flexible tube body is inserted for treatment, thereby reducing the patient's condition. Pain, reducing the difficulty of the surgery.

Compared with the prior art, the beneficial effects of the present invention:

Soft and elastic, better adhesion, less difficulty in surgery, more uniform distribution of contrast agent, better puncture effect.

BRIEF DESCRIPTION OF THE DRAWINGS:

Figure 1 is a schematic view showing the structure of the present invention when the core is not inserted.

2 is a schematic view showing the structure of the present invention when inserting a core.

3 is a schematic structural view of a schematic wire arrangement of the present invention.

Figure 4 is a schematic view showing the first structure of the electrode of the present invention.

Figure 5 is a schematic view showing the second structure of the electrode of the present invention.

Figure 6 is a schematic view showing the third structure of the electrode of the present invention.

Figure 7 is a first schematic view of the wire arrangement of the present invention.

Figure 8 is a second schematic view of the wire arrangement of the present invention.

Figure 9 is a schematic view showing the structure of a mandrel of the core of the present invention.

Figure 10 is a schematic view showing the structure of a liner of the present invention.

Figure 11 is an effect view of the present invention when the core of Figure 10 is used.

Figure 12 is a schematic view showing another structure of the mandrel of the core of the present invention.

Figure 13 is a schematic view showing another structure of the core of the present invention.

Fig. 14 is a view showing the effect of the present invention when the core of Fig. 13 is used.

Marked in the figure: 1-free end, 2-electrode, 3-flexible body, 4-handle, 5-wire bundle, 6-plug, 7-core, 8-temperature sensor wire, 9-electrode wire.

detailed description

The present invention will be further described in detail below with reference to the embodiments and specific embodiments. However, the scope of the above-mentioned subject matter of the present invention should not be construed as being limited to the following embodiments, and the technology implemented based on the present invention is within the scope of the present invention.

Example 1

As shown in Figures 1 and 2, an ablation electrode is used in the field of pain ablation, which includes:

The flexible pipe body 3 is a hose with two ends of biocompatible material, which can be bent, and includes a free end 1. The flexible pipe body 3 is specifically made of a biocompatible polymer material (such as : polyether block amide, polyurethane or nylon);

a support member, which is disposed in the flexible pipe body 3, can be drawn from the flexible pipe body 3 without the free end 1, one end of which can pass through the free end 1 of the flexible pipe body 3;

An electrode 2, which is disposed at the free end 1 of the flexible tubular body 3, is capable of releasing radio frequency energy, and the electrode 2 surrounds the outer surface of the free end 1 of the flexible tubular body 3 in an amount equal to or greater than two, in this embodiment 4, distributed along the length direction of the flexible pipe body 3, each electrode 2 is powered by a separate electrode wire 9, and the RF source connected to each electrode has a potential difference or a phase difference, which can form a discharge ablation between the electrodes. More adaptable and less patiently painful.

In this embodiment, the ablation electrode further includes a handle 4, the non-free end 1 of the flexible tube body 3 is mounted on the handle 4, the handle 4 is hollow, and the support member can be simultaneously disposed at the flexible In the tube body 3 and the handle 4, the handle 4 is a tube body, and the outer surface thereof is provided with a non-slip texture for the doctor to hold.

As shown in FIG. 3, in the embodiment, the flexible pipe body 3 is further provided with a chamber for passing through the support member.

The ablation electrode further includes the temperature sensor mounted to a lower surface of the electrode 2, the temperature sensor being energized by a temperature sensor lead 8, the temperature sensor passing through the chamber, the temperature sensor being temperature The sensor lead 8 is energized and the electrode is energized by the electrode lead 9.

As shown in FIGS. 3, 7, and 8, the electrode lead 9 and the temperature sensor lead 8 are wound in the same direction in the flexible tube body, and the side-by-side manner is various. As shown in FIGS. 7 and 8, the temperature sensor lead 8 can be side by side. On the two sides of the electrode lead 9, they may also be arranged side by side between two adjacent electrode leads 9. The handle 4 is provided with a hole for the electrode lead 9 and the temperature sensor lead 8 to protrude. 9. The temperature sensor wires 8 extend out of the holes and are assembled into a wire harness 5, which is connected to an external power source through the plug 6.

In this embodiment, the supporting member is a lining core 7, which includes a mounting seat and a mandrel. The mandrel may be in the shape of a straight shape, a curved shape or a circular arc shape, and is mounted on the mounting seat and disposed. In the flexible pipe body 3, the mounting seat can be fixedly mounted on the end of the handle 4. When the mandrel is inserted into the flexible pipe body 3 and the handle 4, it is an interference fit or a transition fit.

The end of the handle 4 is a pipe body with a thread on the outer side, and the mounting seat is provided with an internal thread that cooperates with the thread on the handle 4, and the mandrel is disposed in the flexible pipe body 3, The mounting seat cooperates with the handle 4 to achieve positioning.

4, 5, 6, the mandrel is a strip having a hardness greater than that of the flexible hose, and the top of the mandrel is a portion of the flexible pipe body 3 having a cross section that is gradually smaller or has a constant cross section. It may be a semi-spherical shape, a conical shape, a trapezoidal boss, a bullet shape, and the mandrel is made of stainless steel or titanium.

According to different lesion parts, the lining core 7 can have different shapes. As shown in FIG. 9 to FIG. 11 , the top of the mandrel is bent once at an angle to support the flexible tubular body 3 so that the free end 1 thereof Becomes this shape and can better adapt to the shape of the lesion;

12-13, the top of the mandrel is curved in a circular arc shape, and is shaped to support the flexible tubular body 3 such that the free end 1 thereof has a circular arc shape, which can better adapt to the shape of the lesion portion;

According to the actual situation, according to the different types of lesions, the core 7 of different shape mandrels can be customized, and the treatment effect is good for treatment.

Claims

An ablation electrode for use in the field of pain ablation, comprising:

a flexible pipe body, which is a hose with two ends formed of a biocompatible material, capable of being bent, including a free end;

a support member, which is disposed in the flexible tube body, is capable of being withdrawn from the flexible tube body from the free end, and one end of which can pass through the free end of the flexible tube body;

An electrode disposed at a free end of the flexible tube body capable of releasing radio frequency energy;

Wherein, the number of the electrodes is greater than or equal to two, and discharge ablation is formed between the electrodes.
An ablation electrode according to claim 1, further comprising a handle, said flexible tube body being non-free end mounted on said handle, said handle being hollow, said support member being capable of being simultaneously placed The flexible pipe body and the handle are described.
An ablation electrode according to claim 1, wherein said flexible tube body is provided with a chamber for passing through the support member.
An ablation electrode according to claim 1, further comprising a temperature sensor mounted to said lower surface of said electrode, said temperature sensor being energized by a temperature sensor lead, said electrode being electrode lead Energy Supply.
The ablation electrode according to claim 4, wherein the electrode lead and the temperature sensor lead are wound in the same direction in the flexible tube body, and the end of the handle is provided with the electrode lead and the temperature. A hole through which the sensor wire extends, the electrode wire and the temperature sensor wire extend out of the hole and are connected to an external power source through the plug.
An ablation electrode according to claim 1, wherein said electrode is disposed at The outer surface of the free end of the flexible pipe body.
The ablation electrode according to claim 2, wherein the supporting member is a core, which comprises a mounting seat and a mandrel, and the mandrel may be in the shape of a straight shape, a curved shape or a circular arc shape. The utility model is mounted on the mounting seat and is disposed in the flexible pipe body, and the mounting seat can be fixedly mounted on the end of the handle.
The ablation electrode according to claim 7, wherein the end of the handle is a tubular body with a thread distributed outside, and the mounting seat is provided with an internal thread that cooperates with a thread on the handle, the core The shaft is disposed in the flexible tube body, and the mounting seat cooperates with the handle to achieve positioning.
The ablation electrode according to claim 7, wherein the mandrel is a strip having a hardness greater than that of the flexible hose, and the top portion of the mandrel is in a cross section that is gradually smaller or horizontal. A boss with a constant cross section.
An ablation electrode according to claim 6, wherein said electrode surrounds the outer surface of the free end of the flexible tube body in an amount equal to or greater than one.