CN115399869A - Ablation needle, processing technology, ablation system and using method thereof - Google Patents
Ablation needle, processing technology, ablation system and using method thereof Download PDFInfo
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- CN115399869A CN115399869A CN202211359266.6A CN202211359266A CN115399869A CN 115399869 A CN115399869 A CN 115399869A CN 202211359266 A CN202211359266 A CN 202211359266A CN 115399869 A CN115399869 A CN 115399869A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/1206—Generators therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00577—Ablation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/1206—Generators therefor
- A61B2018/1246—Generators therefor characterised by the output polarity
- A61B2018/126—Generators therefor characterised by the output polarity bipolar
Abstract
The invention discloses an ablation needle, a processing technology, an ablation system and a using method thereof, and relates to the technical field of high-end equipment manufacturing. The first needle body comprises a first conductive rod and a first electrode part connected with the first conductive rod; the second needle body comprises a second electrode part and a second conducting rod, the second electrode part and the second conducting rod are sleeved on the first conducting rod, and the first electrode part and the second electrode part are arranged at intervals along the axial direction of the ablation needle; the insulating part comprises a first insulating part and a second insulating part, one part of the first insulating part is arranged between the first electrode part and the second electrode part, the other part of the first insulating part is arranged between the first conducting rod and the second electrode part and between the first conducting rod and the second conducting rod, and the second insulating part is sleeved outside the second conducting rod; the first electrode part and the second electrode part are arranged in an equal diameter mode and used for forming an electric field on a focus part after electrification. Through the mode, the problem of difficult needle distribution is solved.
Description
Technical Field
The invention relates to the technical field of high-end equipment manufacturing, in particular to an ablation needle, a processing technology, an ablation system and a using method thereof.
Background
Irreversible electroporation (IRE) is an emerging technology related to athermal ablation of tumors by sending a set of high voltage electrical pulses through electrodes to create an electric field in the tissue that irreversibly electroporates the cell membrane, thereby causing apoptosis of the tumor cells. When the operation ablation is carried out, generally two to six unipolar ablation needles are punctured simultaneously according to the size of a tumor, and then high-voltage pulses applied between the two single-electrode ablation needles are respectively selected to puncture cell membranes so as to carry out the tumor ablation.
Because a plurality of ablation needles need to be arranged, the requirement on the parallelism between the needles is higher during discharge ablation, and dense blood vessels or narrow space near a lesion part often exist near the lesion part, so that the problem of difficult needle arrangement exists.
Disclosure of Invention
The invention mainly provides an ablation needle, a processing technology, an ablation system and a using method thereof, and aims to solve the problem of difficult needle distribution.
In order to achieve the above object, the present invention provides an ablation needle, which includes a first needle body, a second needle body, and an insulating member;
the first needle body comprises a first conductive rod and a first electrode part connected to the first conductive rod; the second needle body comprises a second electrode part and a second conducting rod, the second electrode part is sleeved on the first conducting rod and connected to the second conducting rod, and the first electrode part and the second electrode part are arranged at intervals along the axial direction of the ablation needle; the insulating part comprises a first insulating part and a second insulating part, one part of the structure of the first insulating part is arranged between the first electrode part and the second electrode part, the other part of the structure of the first insulating part is arranged between the first conducting rod and the second electrode part and between the first conducting rod and the second conducting rod, and the second insulating part is sleeved outside the second conducting rod;
the first electrode part and the second electrode part are arranged in an equal diameter mode, and the first electrode part and the second electrode part are used for forming an electric field on a focus part after being electrified so as to ablate the focus part.
Optionally, the first insulating portion includes a first outer insulating sleeve and an inner insulating sleeve, the inner insulating sleeve is sleeved on the first conducting rod, and the first outer insulating sleeve is sleeved on the inner insulating sleeve and is disposed between the first electrode portion and the second electrode portion;
the first outer insulating sleeve has a length L1 along an axial direction of the first conductive rod, and the first electrode portion and the second electrode portion have the same length L2, wherein a ratio of the length L1 to the length L2 is X, and the range of X is 1 to 4.
Optionally, said X ranges from 1 to 3.
Optionally, the length L1 is 5-20mm.
Optionally, the second insulating portion includes a second outer insulating sleeve, the second outer insulating sleeve is sleeved outside the second conductive rod, the outer diameter of the first conductive rod is smaller than the outer diameter of the first electrode portion, and the outer diameter of the second conductive rod is smaller than the outer diameter of the second electrode portion.
Optionally, an outer diameter of the first outer insulating sleeve and an outer diameter of the second outer insulating sleeve are both equal to an outer diameter of the second electrode portion.
Optionally, the outer diameter of the first electrode portion and the second electrode portion is 0.3-1.5mm.
Optionally, the first outer insulating sleeve, the inner insulating sleeve and the second outer insulating sleeve are made of one of PEEK, zirconia, alumina and PI; and/or the first pin body and the second pin body are made of SUS304.
Optionally, the ablation needle further comprises a handle, a first conductive joint and a second conductive joint, wherein one ends of the first needle body and the second needle body, which are far away from the first electrode part, are fixed to the handle, the first conductive joint is electrically connected with the first needle body through a first conductive cable, and the second conductive joint is electrically connected with the second needle body through a second conductive cable;
wherein one end of the first conductive cable and one end of the second conductive cable are mounted to the handle.
In order to achieve the above object, the present invention further provides a processing technique of an ablation needle, including:
pretreatment of an ablation needle: scrubbing the surfaces of the two stainless steel needle tubes and soaking the surfaces of the two stainless steel needle tubes in alcohol to obtain a first stainless steel needle tube and a second stainless steel needle tube;
preparing a first needle body: preparing a needle head at one end of a processed first stainless steel needle tube to obtain a first electrode part, preparing a stainless steel needle tube with the outer diameter smaller than that of the first electrode part for a part of the structure of the first stainless steel needle tube far away from the needle head to obtain a first conductive rod, preparing an inner insulating layer on the surface of the first conductive rod, and preparing a first outer insulating layer with the outer diameter equal to that of the first electrode part on the surface of the inner insulating layer close to the first electrode part;
preparing a second needle body: preparing a second electrode part with the same outer diameter as the first electrode part at one end of the processed second stainless steel needle tube, preparing a stainless steel needle tube with the outer diameter smaller than that of the second electrode part on a part of the structure of the second stainless steel needle tube far away from the second electrode part to obtain a second conducting rod, and preparing a second outer insulating layer with the same outer diameter as the second electrode part on the surface of the second conducting rod;
assembling an ablation needle core: coaxially sleeving a second electrode part and a second conducting rod outside the first conducting rod, and enabling the second electrode part to abut against the first outer insulating layer to obtain a needle core of the ablation needle;
welding an electric joint: welding one end of a first conductive cable on one end of the first conductive rod far away from the first electrode part to obtain a first electric connection part, welding the other end of the first conductive cable with a first conductive joint, welding one end of a second conductive cable on one end of the second conductive rod far away from the second electrode part to obtain a second electric connection part, and welding the other end of the second conductive cable with a second conductive joint;
assembling an ablation needle: assembling the upper and lower shells of the handle and the internal fixing block on the ablation needle core, and installing the second electric connection part and the second electric connection part on the handle to obtain the ablation needle.
In order to achieve the above object, the present invention further provides an ablation system, which includes an ablation host and the ablation needle, wherein the ablation needle is electrically connected to the ablation host, the ablation host is configured to generate an electrical pulse and electrically conduct the electrical pulse to the ablation needle, and the ablation needle is configured to form an electric field on a lesion site through the first electrode portion and the second electrode portion so as to ablate the lesion site.
In order to achieve the above object, the present invention further provides a method of using an ablation system, the method of using the ablation system, including the steps of:
the ablation needle punctures into the focus part;
the ablation host generates an electric pulse and transmits the electric pulse to the ablation needle;
the ablation needle receives the electric pulse and forms an electric field on the focal part through the first electrode part and the second electrode part so as to ablate the focal part.
The invention has the beneficial effects that: the invention is different from the situation of the prior art, and discloses an ablation needle, a processing technology, an ablation system and a using method thereof.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of an ablation system of the invention;
FIG. 2 is a cross-sectional view of an embodiment of the ablation needle of the present invention;
FIG. 3 is a schematic view of an embodiment of an ablation needle of the present invention in a broken-away configuration;
FIG. 4 is a schematic process step diagram of one embodiment of the present invention for manufacturing an ablation needle;
FIG. 5 is a schematic flow chart illustrating the steps of one embodiment of a method of using the ablation system of the invention;
FIG. 6 is an ablation map of a first set of ablations for a lesion site in a laboratory animal according to an embodiment of the present invention;
FIG. 7 is an ablation map of a lesion site of a second group of experimental animals with ablation needles according to an embodiment of the present invention;
fig. 8 is an ablation map of a third set of ablations for a lesion site in a laboratory animal in accordance with an embodiment of the present invention.
The reference numbers indicate:
10. an ablation host; 20. an ablation needle; 30. a first electrically conductive cable; 40. a second electrically conductive cable; 1. a first needle body; 11. a first conductive rod; 12. a first electrode section; 2. a second needle body; 21. a second conductive rod; 22. a second electrode section; 3. an insulating member; 31. a first insulating portion; 311. a first outer insulating sleeve; 312. an inner insulating sleeve; 32. a second insulating section; 321. a second outer insulating sleeve; 4. a handle; 41. a fixed head; 5. a first conductive contact; 6. a second conductive contact.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, unless otherwise explicitly stated or limited, the terms "connected", "fixed", and the like are to be understood broadly, for example, "fixed" may be fixedly connected, may be detachably connected, or may be integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention provides an ablation system, referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an embodiment of the ablation system of the present invention, and fig. 2 is a schematic sectional structural diagram of an embodiment of an entire ablation needle of the present invention, the ablation system includes an ablation host 10 and an ablation needle 20, and the ablation needle 20 is electrically connected to the ablation host 10 through a first conductive cable 30 and a second conductive cable 40. The ablation host 10 has a pulse generation module, which may be a pulse voltage generator, for generating electrical pulses and electrically conducted to the ablation needle 20 through the first and second electrically conductive cables 30, 40. The ablation needle 20 is used for penetrating into a focus part through skin, the front end of the ablation needle 20 penetrating into the focus part is provided with a bipolar component, and the bipolar component is used for forming an electric field on the focus part after being electrified so that cell membranes on the focus part are subjected to irreversible electroporation, and therefore the focus part is ablated.
Specifically, the ablation needle 20 can be used for ablation of lesion sites such as pancreatic cancer, prostatic hyperplasia, thyroid nodule/cancer, and the like.
In the ablation process, only one ablation needle 20 needs to be punctured into a focus part, so that the ablation operation can be performed on the focus part, and compared with the traditional mode that two or more ablation needles 20 are punctured into the focus part, the mode that a single ablation needle 20 ablates the focus part has the advantages of simple needle arrangement and simplicity and convenience in operation, particularly, the difficulty of needle arrangement can be greatly reduced for the focus part of dense blood vessels or narrow space, and the possibility of occurrence of medical accidents is reduced.
In view of the above-mentioned objects, the present invention provides an ablation needle 20, referring to fig. 1 to 3, wherein fig. 3 is a schematic view of a broken structure of an embodiment of the ablation needle of the present invention, the ablation needle 20 includes a first needle body 1, a second needle body 2, and an insulating member 3. First needle body 1 and second needle body 2 all are cylindric setting, and first needle body 1 includes first conducting rod 11 and fixed connection in the first electrode portion 12 of 11 one ends of first conducting rod, first electrically conductive cable 30 and first conducting rod 11 electric connection. The second pin body 2 includes a second electrode part 22 and a second conductive rod 21 coaxially sleeved on the first conductive rod 11, the second electrode part 22 is fixedly connected to one end of the second conductive rod 21 close to the first electrode part 12, and the second conductive cable 40 is electrically connected to the second conductive rod 21. The first electrode part 12 and the second electrode part 22 are arranged at intervals along the axial direction of the ablation needle 20, and the two end surfaces of the first electrode part 12 and the second electrode part 22 close to each other are arranged in parallel.
The insulating member 3 includes a first insulating portion 31 and a second insulating portion 32, a part of the first insulating portion 31 is disposed between the first electrode portion 12 and the second electrode portion 22 to insulate and separate the first electrode portion 12 from the second electrode portion 22, and another part of the first insulating portion 31 is disposed between the first conductive rod 11 and the second electrode portion 22 and between the first conductive rod 11 and the second conductive rod 21 to insulate and separate the first conductive rod 11 from the second electrode portion 22 and between the first conductive rod 11 and the second conductive rod 21. The second insulating portion 32 is sleeved outside the second conductive rod 21 and exposed outside the ablation needle 20.
The first electrode part 12 and the second electrode part 22 are used for forming an electric field on a focus part after being electrified, so that irreversible electroporation is carried out on cell membranes on the focus part, and the focus part is ablated. The first electrode part 12 and the second electrode part 22 are arranged in an equal diameter mode, so that an electric field formed by the first electrode part 12 and the second electrode part 22 on a focus part is relatively round, the ablation effect is further improved, and the treatment effect is further improved.
The first electrode part 12 and the second electrode part 22 are coaxially arranged on the same ablation needle 20, and the first electrode part 12 and the second electrode part 22 are always kept in a parallel state, so that an electric field can be formed on a focus part after the single ablation needle 20 is electrified, and a series of ablation operations can be carried out. Compared with the traditional mode that the electric field is formed by electrifying two or more ablation needles 20, the ablation needle 20 provided by the invention can complete the ablation operation on the focus without arranging two or more ablation needles 20 in the implementation process. Therefore, the problem of difficult needle distribution can be effectively solved, the needle distribution efficiency can be improved, and the operation is simple and quick.
In the using process, the electric pulse generated by the ablation host 10 is respectively conducted to the first conducting rod 11 and the second conducting rod 21 through the first conducting cable 30 and the second conducting cable 40, then the first electrode part 12 and the second electrode part 22 are used for discharging to form a relatively circular electric field, and a series of electric pulses transmitted between the first electrode part 12 and the second electrode part 22 enable a cell membrane of a focus part to generate a nanopore, namely, irreversible electroporation is performed on the cell membrane of the focus part, so that the focus part is ablated.
The bipolar component may be a first electrode portion 12 and a second electrode portion 22, and the first electrode portion 12 and the second electrode portion 22 are one of a positive electrode and a negative electrode, respectively. For example, the first electrode portion 12 may be a positive electrode and the second electrode portion 22 may be a negative electrode.
The first electrode part 12 can be used as a needle head, the needle head is designed to be a triangular needle head, and the needle head can be easily punctured into a focus part through skin by the aid of the setting, so that the smoothness of puncture is improved, and damage to biological tissues is reduced.
With reference to fig. 1 to 3, the first insulating portion 31 includes a first outer insulating sleeve 311 and an inner insulating sleeve 312, the inner insulating sleeve 312 is sleeved on the first conductive rod 11, the first outer insulating sleeve 311 is sleeved on the inner insulating sleeve 312, and the first outer insulating sleeve 311 is sleeved between the first electrode portion 12 and the second electrode portion 22 to insulate and separate the first electrode portion 12 and the second electrode portion 22. The second insulating portion 32 includes a second outer insulating sleeve 321, and the second outer insulating sleeve 321 is sleeved outside the second conductive rod 21, so that the outside of the second conductive rod 21 is an insulating arrangement.
Alternatively, the first insulating portion 31 may also be a first outer insulating sleeve 311 and an inner insulating coating, the inner insulating coating is coated outside the first conducting rod 11, and the first outer insulating sleeve 311 is sleeved on the inner insulating coating. The second insulating portion 32 may also be an outer insulating coating applied to the outside of the second conductive rod 21. Through at first conducting rod 11 outside coating internal insulation coating, second conducting rod 21 outside coating external insulation coating, can realize insulating function on the one hand, on the other hand is convenient for install, saves the installation step, promotes the installation effectiveness.
Along the axial direction of the first conductive rod 11, the first outer insulating sleeve 311 has a length L1, and the first electrode part 12 and the second electrode part 22 have the same length L2, wherein the ratio of the length L1 to the length L2 is X, and X ranges from 1 to 4. Wherein the length L1 is in the range of 5-20mm.
Alternatively, X ranges from 1 to 3.
For example, the ratio of the length L1 to the length L2 is 1, and the length L1 is 5mm, then the length L2 is 5mm; the ratio of the length L1 to the length L2 is 3, the length L1 is 15mm, and the length L2 is 5mm; the ratio of the length L1 to the length L2 is 4, the length L1 is 20mm, and the length L2 is 5mm.
The ablation needle 20 with the above numerical value is selected to ablate a focus part, wherein the focus part is the focus part of the experimental animal, and the ablation condition is shown in the following table:
| group of | L1-L2 | Ablation area (cm 2) | Long (cm) | Width (cm) |
| First group | 5-5 | 1.242 | 1.630 | 0.881 |
| Second group | 15-5 | 6.326 | 3.976 | 1.577 |
| Third group | 20-5 | 5.121 | 3.561 | 1.576 |
The lesion site ablation of the experimental animal is shown in fig. 6, 7 and 8, wherein fig. 6 is an ablation graph of a first group of ablations for the lesion site of the experimental animal, fig. 7 is an ablation graph of a second group of ablations for the lesion site of the experimental animal, and fig. 8 is an ablation graph of a third group of ablations for the lesion site of the experimental animal. As can be seen from the above experimental ablation, the ablation area of the first group of ablation needles 20 to the lesion site is small, the ablation area of the second group of ablation needles 20 to the lesion site is large, and the ablation area of the third group of ablation needles 20 to the lesion site is smaller than the ablation area of the second group of ablation needles 20 to the lesion site.
When the lengths of the first electrode part 12 and the second electrode part 22 are set to be 5mm and the length of the first outer insulating sleeve 311 is set to be 15mm, that is, the distance between the first electrode part 12 and the second electrode part 22 is set to be 15mm, the ablation area of the ablation needle 20 on the lesion site can be enlarged by setting the lengths to be 5mm and 15mm, so that the ablation efficiency and the ablation effect can be improved, the ablation time can be shortened, and the operation time can be shortened.
The outer diameter of the first conductive rod 11 is smaller than that of the first electrode part 12 so as to fill the inner insulating sleeve 312 and the first outer insulating sleeve 311, and the outer diameter of the second conductive rod 21 is smaller than that of the second electrode part 22 so as to fill the second outer insulating sleeve 321, thereby making full use of the gap between the structures to improve space utilization.
The outer diameter of the first outer insulating sleeve 311 and the outer diameter of the second outer insulating sleeve 321 are equal to the outer diameter of the second electrode part 22, so that the ablation needle 20 can be smoothly penetrated into the lesion site through the skin, and the damage to the biological tissue is reduced.
Wherein the outer diameters of the first electrode portion 12 and the second electrode portion 22 are 0.3-1.5mm. For example, the outer diameters of the first electrode portion 12 and the second electrode portion 22 are both 0.45mm, and the outer diameters of the first electrode portion 12 and the second electrode portion 22 are set so that when the ablation needle 20 is punctured into biological tissue through skin, the needle hole left on the skin is small, and damage to the epidermal tissue is effectively avoided.
The first outer insulating sleeve 311, the inner insulating sleeve 312 and the second outer insulating sleeve 321 are made of one of PEEK, zirconia, alumina and PI; and/or the first needle body 1 and the second needle body 2 are made of SUS304, so that the service life of the ablation needle 20 can be prolonged.
For example, the first outer insulating sleeve 311 may be PI, the inner insulating sleeve 312 may be PEEK, and the second outer insulating sleeve 321 may be alumina.
With continued reference to fig. 1 to 3, the ablation needle 20 further includes a handle 4, a first conductive connector 5 and a second conductive connector 6, wherein the ends of the first needle body 1 and the second needle body 2 away from the first electrode portion 12 are fixed to the handle 4, the first conductive connector 5 is electrically connected to the first conductive rod 11 through a first conductive cable 30, and the second conductive connector 6 is electrically connected to the second conductive rod 21 through a second conductive cable 40. Wherein one end of the first conductive cable 30 and one end of the second conductive cable 40 are mounted to the handle 4.
The handle 4 is close to the one end of first electrode portion 12 and is installed fixed head 41, and fixed head 41 is used for fixed first needle 1 and second needle body 2 to install firmly on handle 4, promote the steadiness of installation.
In use, the first conductive connector 5 and the second conductive connector 6 are respectively electrically connected to the ablation host 10, and the first conductive connector 5 and the second conductive connector 6 are respectively used for electrically conducting an electric pulse generated by the ablation host 10 to the first conductive rod 11 and the second conductive rod 21, so as to energize the ablation needle 20, so as to perform an ablation operation on a lesion site.
The invention further provides a processing technology of the ablation needle, referring to fig. 4, fig. 4 is a schematic process step diagram of an embodiment of the processing technology of the ablation needle of the invention, and the processing technology comprises:
s10: pretreatment of the ablation needle 20: scrubbing the surfaces of the two stainless steel needle tubes and soaking the surfaces of the two stainless steel needle tubes in alcohol to obtain a first stainless steel needle tube and a second stainless steel needle tube;
s20: preparing a first needle body 1: preparing a needle head at one end of a processed first stainless steel needle tube to obtain a first electrode part 12, preparing a stainless steel needle tube with the outer diameter smaller than that of the first electrode part 12 for a part of the structure of the first stainless steel needle tube far away from the needle head to obtain a first conducting rod 11, preparing an inner insulating layer on the surface of the first conducting rod 11, and preparing a first outer insulating layer with the outer diameter equal to that of the first electrode part 12 on the surface of the inner insulating layer close to the first electrode part 12;
s30: preparing a second needle body 2: preparing a second electrode part 22 with the same outer diameter as the first electrode part 12 at one end of the processed second stainless steel needle tube, preparing a stainless steel needle tube with the outer diameter smaller than that of the second electrode part 22 for the part structure of the second stainless steel needle tube far away from the second electrode part 22 so as to obtain a second conducting rod 21, and preparing a second outer insulating layer with the same outer diameter as that of the second electrode part 22 on the surface of the second conducting rod 21;
s40: assembling the ablation needle 20 core: assembling the ablation needle 20 core: coaxially sleeving a second electrode part 22 and a second conductive rod 21 outside the first conductive rod 11, wherein the second electrode part 22 is abutted against the first outer insulating layer to obtain a needle core of the ablation needle 20;
s50: welding an electric connector: welding one end of a first conductive cable 30 to one end of the first conductive rod 11, which is far away from the first electrode part 12, to obtain a first power connection part, welding the other end of the first conductive cable 30 to the first conductive joint 5, welding one end of a second conductive cable 40 to one end of the second conductive rod 21, which is far away from the second electrode part 22, to obtain a second power connection part, and welding the other end of the second conductive cable 40 to the second conductive joint 6;
s60: assembling the ablation needle 20: assembling the upper and lower shells of the handle 4 and the internal fixing block on the core of the ablation needle 20, and installing the second electric connection part and the second electric connection part on the handle 4 to obtain the ablation needle 20.
In the process of preparing the first needle body 1 and the second needle body 2, one end of the first stainless steel needle tube is made into a needle head, the part of the first stainless steel needle tube far away from the needle head is made into a first conducting rod 11 with the outer diameter smaller than the outer diameter of the first electrode part 12, and the part of the second stainless steel needle tube far away from the second electrode part 22 is made into a second conducting rod 21 with the outer diameter smaller than the outer diameter of the second electrode part 22, and the first conducting rod and the second conducting rod can be processed in a turning or grinding mode. The preparation process may adopt one or more of chemical bonding, thermal spraying, chemical vapor deposition and the like, and the processes adopted by the first insulating part 31 and the second insulating part 32 may be the same or different. The first conductive rod 11, the first insulating part 31, the second conductive rod 21 and the second insulating part 32 are fixed by using an adhesive, the cost is low, the use efficiency is high, thermal spraying is based on the thermoplastic characteristics of materials such as polyetheretherketone and polyimide, the first insulating part 31 and the second insulating part 32 after thermal spraying can reach a thinner thickness, the ablation effect of the ablation needle 20 can be further improved, chemical vapor deposition mainly aims at firm coatings such as aluminum oxide and zirconium oxide which have excellent insulating properties but are firm in shape, and an insulating layer formed by a chemical vapor deposition mode is thinner and firmer and is not easy to damage.
The present invention further provides a method for using an ablation system, which uses the ablation system, and referring to fig. 5, fig. 5 is a schematic flow chart of an embodiment of the method for using the ablation system of the present invention, and the method for using the ablation system of the present invention includes the following steps:
s1: the ablation needle punctures into the focus part;
before step S1, the ablation needle is connected with an ablation host machine through a first conductive connector and a second conductive connector.
S2: the ablation host generates electric pulses and transmits the electric pulses to the ablation needle;
s3: the ablation needle receives the electric pulse and forms an electric field on the focal site through the first electrode part and the second electrode part so as to ablate the focal site.
The invention has the beneficial effects that: different from the prior art, the invention discloses an ablation needle, a processing technology, an ablation system and a using method thereof, wherein a second electrode part 22 and a second conductive rod 21 are coaxially sleeved outside a first conductive rod 11, so that the first electrode part 12 and the second electrode part 22 are coaxially set, the first electrode part 12 and the second electrode part 22 are arranged at intervals along the axial direction of the ablation needle 20, the first electrode part 12 and the second electrode part 22 are insulated by a first insulating part 31, meanwhile, the first conductive rod 11 and the second electrode part 22 as well as the first conductive rod 11 and the second conductive rod 21 are also insulated by the first insulating part 31, and the outside of the second conductive rod 21 is insulated by a second insulating part 32, wherein the first electrode part 12 and the second electrode part 22 are arranged in an equal diameter manner, so that a circular electric field is formed on a focus part after the first electrode part 12 and the second electrode part 22 are electrified.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. An ablation needle, comprising:
a first needle body including a first conductive rod and a first electrode portion connected to the first conductive rod;
the second needle body comprises a second electrode part and a second conducting rod, the second electrode part is sleeved on the first conducting rod and connected to the second conducting rod, and the first electrode part and the second electrode part are arranged at intervals along the axial direction of the ablation needle;
the insulating part comprises a first insulating part and a second insulating part, one part of the structure of the first insulating part is arranged between the first electrode part and the second electrode part, the other part of the structure of the first insulating part is arranged between the first conducting rod and the second electrode part and between the first conducting rod and the second conducting rod, and the second insulating part is sleeved outside the second conducting rod;
the first electrode part and the second electrode part are arranged in an equal diameter mode, and the first electrode part and the second electrode part are used for forming an electric field on a focus part after being electrified so as to ablate the focus part.
2. The ablation needle of claim 1, wherein the first insulating portion comprises a first outer insulating sleeve and an inner insulating sleeve, the inner insulating sleeve is sleeved on the first conductive rod, and the first outer insulating sleeve is sleeved on the inner insulating sleeve and is disposed between the first electrode portion and the second electrode portion;
the first outer insulating sleeve has a length L1 along an axial direction of the first conductive rod, and the first electrode portion and the second electrode portion have the same length L2, wherein a ratio of the length L1 to the length L2 is X, and the range of X is 1 to 4.
3. The ablation needle of claim 2, wherein X ranges from 1 to 3.
4. The ablation needle of claim 3, wherein the length L1 is 5-20mm.
5. The ablation needle of claim 2, wherein the second insulating portion comprises a second outer insulating sleeve, the second outer insulating sleeve is sleeved outside the second conductive rod, the outer diameter of the first conductive rod is smaller than the outer diameter of the first electrode portion, and the outer diameter of the second conductive rod is smaller than the outer diameter of the second electrode portion.
6. The ablation needle of claim 5, wherein an outer diameter of the first outer insulating sleeve and an outer diameter of the second outer insulating tube are both equal to an outer diameter of the second electrode portion.
7. The ablation needle of claim 5, wherein the outer diameter of the first electrode portion and the second electrode portion is 0.3-1.5mm.
8. The ablation needle of claim 5, wherein the first outer insulating sleeve, the inner insulating sleeve and the second outer insulating sleeve are made of one of PEEK, zirconia, alumina and PI; and/or the presence of a gas in the gas,
the first pin body and the second pin body are made of SUS304.
9. The ablation needle of claim 1, further comprising a handle, a first conductive contact and a second conductive contact, wherein the ends of the first needle body and the second needle body distal from the first electrode portion are fixed to the handle, the first conductive contact is electrically connected to the first needle body via a first conductive cable, and the second conductive contact is electrically connected to the second needle body via a second conductive cable;
wherein one end of the first conductive cable and one end of the second conductive cable are mounted to the handle.
10. A process for manufacturing an ablation needle, comprising:
pretreatment of an ablation needle: scrubbing the surfaces of the two stainless steel needle tubes and soaking the surfaces of the two stainless steel needle tubes in alcohol to obtain a first stainless steel needle tube and a second stainless steel needle tube;
preparing a first needle body: preparing a needle head at one end of a processed first stainless steel needle tube to obtain a first electrode part, preparing a stainless steel needle tube with the outer diameter smaller than that of the first electrode part for a part of the structure of the first stainless steel needle tube far away from the needle head to obtain a first conductive rod, preparing an inner insulating layer on the surface of the first conductive rod, and preparing a first outer insulating layer with the outer diameter equal to that of the first electrode part on the surface of the inner insulating layer close to the first electrode part;
preparing a second needle body: preparing a second electrode part with the same outer diameter as the first electrode part at one end of the processed second stainless steel needle tube, preparing a stainless steel needle tube with the outer diameter smaller than that of the second electrode part on a part of the structure of the second stainless steel needle tube far away from the second electrode part to obtain a second conducting rod, and preparing a second outer insulating layer with the same outer diameter as the second electrode part on the surface of the second conducting rod;
assembling an ablation needle core: coaxially sleeving a second electrode part and a second conducting rod outside the first conducting rod, wherein the second electrode part is abutted against the first outer insulating layer to obtain a needle core of the ablation needle;
welding an electric connector: welding one end of a first conductive cable to one end of the first conductive rod, which is far away from the first electrode part, to obtain a first electric connection part, welding the other end of the first conductive cable to the first conductive joint, welding one end of a second conductive cable to one end of the second conductive rod, which is far away from the second electrode part, to obtain a second electric connection part, and welding the other end of the second conductive cable to the second conductive joint;
assembling an ablation needle: and assembling the upper shell and the lower shell of the handle and the internal fixing block on the ablation needle core, and installing the second electric connection part and the second electric connection part on the handle to obtain the ablation needle.
11. An ablation system, comprising an ablation host and the ablation needle as claimed in any one of claims 1 to 9, wherein the ablation needle is electrically connected with the ablation host, the ablation host is used for generating an electrical pulse and conducting the electrical pulse to the ablation needle, and the ablation needle is used for forming an electric field on a lesion site through the first electrode part and the second electrode part so as to ablate the lesion site.
12. A method of using an ablation system according to claim 11, comprising the steps of:
the ablation needle punctures into the focus part;
the ablation host generates an electric pulse and transmits the electric pulse to the ablation needle;
the ablation needle receives the electric pulse and forms an electric field on the focal position through the first electrode part and the second electrode part so as to ablate the focal position.
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