CN117679152B - Reconfigurable ablation needle for ablation area - Google Patents
Reconfigurable ablation needle for ablation area Download PDFInfo
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- CN117679152B CN117679152B CN202311819222.1A CN202311819222A CN117679152B CN 117679152 B CN117679152 B CN 117679152B CN 202311819222 A CN202311819222 A CN 202311819222A CN 117679152 B CN117679152 B CN 117679152B
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Abstract
The invention belongs to the technical field of medical instruments, and particularly relates to an ablation area reconfigurable ablation needle which comprises a needle rod, wherein a needle head is arranged at one end of the needle rod, a coaxial cable is fixed in the needle rod, the coaxial cable comprises a coaxial inner core, a coaxial outer conductor and a dielectric layer, the coaxial inner core is fixed in the needle rod, the coaxial outer conductor is assembled on the outer side of the coaxial inner core, the dielectric layer is arranged between the coaxial inner core and the coaxial outer conductor, and a metal column is fixed at one end of the coaxial inner core, which is close to the needle head. According to the invention, the positions of the first shaping pipe, the second shaping pipe and the third shaping pipe relative to the needle bar are adjusted to shape the microwave electric field, so that the change of an ablation area from approximately spherical to strip-shaped is realized, the device can ablate focal tissues with different shapes, and the ablation times of the same focal tissue or a special-shaped focal tissue are reduced.
Description
Technical Field
The invention belongs to the technical field of medical appliances, and particularly relates to an ablation region reconfigurable ablation needle.
Background
Microwave ablation techniques are increasingly being applied to the ablation of more tissue tumors, nodules, such as organs like liver, kidney, pancreas, lung, thyroid, etc. The microwave ablation utilizes the microwave energy to act on the tissue to generate a thermal effect, and the central temperature of a thermal field can reach more than 100 ℃ in a shorter time, so that focus tissues are coagulated and inactivated at instant high temperature, and the purpose of ablation treatment is achieved. The microwave ablation is to insert a microwave ablation needle into a focus of human tissue, and continuously emit microwave energy from the front end of the microwave ablation needle to implement the operation, so that the microwave ablation needle has high efficiency, small wound and few complications, has controllable action depth and range on the tissue, and is suitable for the ablation operation of the whole body solid tissue lesions.
Focal tissues tend to be different in form and have approximately spherical, ellipsoidal or irregular shapes and even strip-shaped, strip-shaped or string-shaped lesions, and the ablation areas of the traditional microwave ablation needles are mostly 'ellipsoidal' or approximately 'spherical', so that good ablation effects cannot be achieved on some irregularly-shaped, multiple or string-shaped focal tissues and strip-shaped focal tissues, or even if full-coverage ablation can be achieved, multiple needles are used for ablation, so that excessive normal tissues nearby lesions are ablated, and the economic burden and operation risks of patients are increased due to the use of multiple needles. Based on the above problems, the present document proposes an ablation region reconfigurable ablation needle to improve the above problems.
Disclosure of Invention
The invention aims to provide an ablation needle with a reconfigurable ablation area, which shapes a microwave electric field by adjusting the positions of a first excipient, a second excipient and a third excipient relative to a needle rod, so that the ablation area is changed from an approximately spherical shape to an approximately strip shape, the device can ablate focus tissues with different shapes, and the ablation times of the same focus tissue or a special focus are reduced.
The technical scheme adopted by the invention is as follows:
The utility model provides a reconfigurable ablation needle of ablation area, includes the needle bar, the one end of needle bar is provided with the syringe needle, the inside of needle bar is fixed with coaxial cable, coaxial cable includes coaxial inner core, coaxial outer conductor and dielectric layer, coaxial inner core is fixed in the inside of needle bar, coaxial outer conductor assembles in the outside of coaxial inner core, the dielectric layer sets up between coaxial inner core and coaxial outer conductor, the one end that coaxial inner core is close to the syringe needle is fixed with the metal column, the inside of needle bar just is located the outside of dielectric layer and is fixed with the cooling tube, still includes:
The first shaping pipe is connected to the outer side of the coaxial outer conductor in a sliding mode, and is electrically connected with the coaxial outer conductor;
The inner shaping assembly comprises an inner layer driving pipe and a second shaping pipe, the inner layer driving pipe is connected to the outer side of the cooling pipe in a sliding mode, and the second shaping pipe is fixed at one end, close to the needle head, of the inner layer driving pipe;
the outer shaping assembly comprises an outer driving tube and a third shaping tube, the outer driving tube is connected to the outer side of the needle rod in a sliding mode, and the third shaping tube is fixed at one end, close to the needle head, of the outer driving tube;
The working mode of the device can be changed among an initial mode, a transition mode and a limit mode by adjusting the positions of the first shaping pipe, the inner shaping assembly and the outer shaping assembly relative to the needle bar.
In a preferred embodiment, the distance between the coaxial outer conductor and the metal post in the extension direction of the needle bar is L1,0.1λ 0≤L1≤0.75λ0, where λ 0 refers to the microwave wavelength in vacuum.
In a preferred embodiment, the length of the metal post in the extension direction of the needle shaft is denoted L2,0.05λ 0≤L2≤0.15λ0.
In a preferable scheme, the distance between the first forming tube and the metal column in the horizontal direction is L3, and L3 is more than or equal to 1.5mm.
In a preferred embodiment, the outer diameter of the metal post is greater than or equal to the outer diameter of the coaxial outer conductor.
In a preferred embodiment, the first forming tube and the coaxial outer conductor, the inner driving tube and the cooling tube, and the second forming tube and the cooling tube are all in clearance fit.
In a preferred embodiment, the material of the third forming tube is one of the following materials: titanium, 316L stainless steel or other biocompatible metal materials.
In a preferred scheme, the needle is a hard needle, and the material of the hard needle is one of the following materials: ceramic, fiberglass or other hard material having non-conductive properties, the shape of the hard needle being one of the following forms: conical, triangular or other needle shape with piercing function.
In a preferred scheme, the needle is a flexible needle, and the material of the flexible needle is one of the following materials: PTFE, PI or other high polymer materials, and the shape of the flexible needle head is circular arc or hemispherical.
The invention has the technical effects that:
after the device is electrified, different shielding can be formed on the microwave electric field by adjusting the positions of the first excipient, the second excipient and the third excipient relative to the needle bar, so that the microwave electric field can be shaped, the device can be changed in an initial mode, a transition mode and a limit mode, and the change of an ablation area from approximately spherical to strip-shaped is realized on focus tissues through different working modes, so that the device can ablate focus tissues with different shapes, the ablation times of the same focus tissues or special-shaped focuses are reduced, the economic burden and the operation risk of a patient are reduced, and meanwhile, excessive ablation of normal tissues near the focus tissues can be avoided.
Drawings
FIG. 1 is a schematic overall structure of a first embodiment of the present invention;
FIG. 2 is a cross-sectional view of the overall structure of a first embodiment of the invention;
FIG. 3 is an enlarged view of a portion of the invention at A in FIG. 2;
FIG. 4 is a schematic flow diagram of a cooling medium of the present invention;
FIG. 5 is a schematic diagram of the overall structure of a second embodiment of the present invention;
FIG. 6 is a cross-sectional view of a construction of a third mode of operation of the present invention;
FIG. 7 is a schematic diagram of the microwave electric field in the third mode of operation of the present invention;
FIG. 8 is a schematic illustration of an ablation zone in transition mode in accordance with a third embodiment of the invention;
FIG. 9 is a cross-sectional view of a transition mode in accordance with a fourth embodiment of the present invention;
FIG. 10 is a schematic diagram of a microwave electric field in transition mode in a fourth embodiment of the invention;
FIG. 11 is a schematic illustration of an ablation zone in transition mode in accordance with a fourth embodiment of the invention;
FIG. 12 is a cross-sectional view of a fifth embodiment of the present invention in a limit mode configuration;
FIG. 13 is a schematic diagram of a microwave electric field in a mode of the fifth embodiment of the present invention;
FIG. 14 is a schematic illustration of an ablation zone in a limit mode in accordance with a fifth embodiment of the invention;
Fig. 15 is a schematic structural diagram of a radio frequency connector and a moving mechanism in a sixth embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
10. A needle bar; 11. a needle; 12. a coaxial core; 13. a coaxial outer conductor; 14. a dielectric layer; 15. a metal column; 16. a cooling tube; 20. a first excipient; 30. an inner shaping assembly; 31. an inner layer driving tube; 32. a second excipient; 40. an outer shaping assembly; 41. an outer layer driving tube; 42. a third excipient; 51. a structural body; 52. an inner layer supporting tube; 53. an outer layer supporting tube; 54. a liquid inlet pipeline; 55. a liquid outlet pipeline; 61. a connector body; 62. an extension tube; 63. and (5) adjusting a knob.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one preferred embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Further, in describing the embodiments of the present invention in detail, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of description, and the schematic is only an example, which should not limit the scope of protection of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Example 1
Referring to fig. 1 to 3, in a first embodiment of the present invention, there is provided an ablation needle with reconfigurable ablation area, including a needle shaft 10, a needle head 11 is disposed at one end of the needle shaft 10, a coaxial cable is fixed inside the needle shaft 10, the coaxial cable includes a coaxial inner core 12, a coaxial outer conductor 13 and a dielectric layer 14, the coaxial inner core 12 is fixed inside the needle shaft 10, the coaxial outer conductor 13 is assembled outside the coaxial inner core 12, the dielectric layer 14 is disposed between the coaxial inner core 12 and the coaxial outer conductor 13, a metal post 15 is fixed at one end of the coaxial inner core 12 close to the needle head 11 by welding or crimping, a cooling tube 16 is fixed inside the needle shaft 10 and outside the dielectric layer 14, and the present invention further includes:
A first forming tube 20, the first forming tube 20 is slidingly connected to the outer side of the coaxial outer conductor 13 and is positioned in the cooling tube 16, and the first forming tube 20 is electrically connected with the coaxial outer conductor 13;
An inner shaping assembly 30, wherein the inner shaping assembly 30 comprises an inner driving tube 31 and a second shaping tube 32, the inner driving tube 31 is connected to the outer side of the cooling tube 16 in a sliding way, and the second shaping tube 32 is fixed at one end of the inner driving tube 31 close to the needle 11;
an outer shaping assembly 40, wherein the outer shaping assembly 40 comprises an outer driving tube 41 and a third shaping tube 42, the outer driving tube 41 is connected to the outer side of the needle bar 10 in a sliding manner, and the third shaping tube 42 is fixed at one end of the outer driving tube 41 close to the needle 11;
wherein the shape of the ablation zone can be changed between an initial mode, a transition mode and a limit mode by adjusting the position of the first excipient 20, the inner excipient assembly 30, the outer excipient assembly 40 relative to the needle shaft 10.
It should be noted that, in the present embodiment, in the initial mode, the shape of the ablation zone is approximately "spherical"; when the device is in the transition mode, the shape of the ablation zone is approximately elliptic; when the device is in the extreme mode, the shape of the ablation zone is approximately elongate.
The material of the needle bar 10 is a hard metal such as titanium alloy or stainless steel, and in this embodiment, the material of the needle bar 10 is preferably titanium alloy.
Furthermore, a radio frequency connector is matched with the device, and the coaxial cable is connected with the radio frequency connector.
Still further, in the present embodiment, the material of the metal pillar 15 may be one of the following materials: copper, stainless steel, silver, the material of the cooling tube 16, the inner driving tube 31 and the outer driving tube 41 is one of the following materials: PTFE, PI, PEEK or other polymeric materials, the material of the second forming tube 32 and the third forming tube 42 is one of the following materials: titanium, copper, stainless steel.
In this embodiment, the rear end of the needle bar 10 is assembled on a radio frequency connector, focus tissue is positioned by an imaging device, the needle 11 is inserted into a focus position, the radio frequency connector is started, so that the front end of the needle bar 10 forms microwave radiation and generates a microwave electric field, focus tissue is ablated, before the needle 11 is inserted into the focus position, the positions of the first excipient 20, the inner layer driving tube 31 and the outer layer driving tube 41 relative to the needle bar 10 are adjusted according to the shape of focus tissue, so that the device is transformed between an initial mode, a transition mode and a limit mode, when the device is in different working modes, the microwave electric field is shielded in different positions by the first excipient 20, the second excipient 32 and the third excipient 42, and then the microwave electric field is shaped by the cooperation of the first excipient 20, the second excipient 32 and the third excipient 42, and finally an ablation area similar to the focus shape is obtained, wherein when the device is in the initial mode, the shaped microwave electric field is approximately spherical, and then an approximately spherical ablation area similar to the focus shape is formed in focus tissue; when the device is in a transition mode, the shaped microwave electric field is approximately elliptic, so that an approximately elliptic ablation area can be formed in focus tissues; when the device is in a limit mode, the shaped microwave electric field is approximately long-strip-shaped, and then an approximately long-strip-shaped ablation area can be formed in focus tissues, so that the device can adjust the shape of the ablation area according to the shape of the focus tissues.
In the above embodiments, for better description of the operation and adjustment of the device, the front end refers to the end close to the needle 11, and the rear end refers to the end far from the needle 11, and of course, the front end and the rear end are only for better description of the device, and are not particularly limited.
Next, referring to fig. 6 again, the distance between the coaxial outer conductor 13 and the metal post 15 in the extending direction of the needle bar 10 is denoted by L1,0.1λ 0≤L1≤0.75λ0, where λ 0 refers to the microwave wavelength in vacuum, for example: the most commonly used frequencies in the clinic for microwave ablation are 915MHz and 2450MHz, and more than 2450MHz, the wavelength of 915MHz is about 330mm, the wavelength of 2450MHz is about 122.5mm, and in this embodiment, the microwave frequency is preferably 2450MHz.
In a specific embodiment, when the microwave has a frequency of 2450MHz, the microwave wavelength is about 122.5mm, and the distance L1 between the coaxial outer conductor 13 and the metal post 15 in the extending direction of the needle bar 10 is about 12mm to 90mm.
In the embodiment, through the arrangement of the scheme, the radiation form can meet the safety requirement, and the parameters such as temperature, radiation intensity and the like in the ablation area are ensured to meet the safety requirement.
In a preferred embodiment, the length of the metal post 15 in the direction of extension of the needle bar 10 is denoted L2,0.05λ 0≤L2≤0.15λ0.
In a specific embodiment, when the microwave has a frequency of 2450MHz, the microwave has a wavelength of about 122.5mm, and the length L2 of the metal post 15 in the extending direction of the needle bar 10 is in the range of about 6mm to 18mm.
In a preferred embodiment, the distance between the first forming tube 20 and the metal column 15 in the horizontal direction is denoted as L3, L3. Gtoreq.1.5 mm.
In this embodiment, by the above arrangement, it is possible to avoid that the device is damaged and cannot work normally because the current breaks through the dielectric layer 14 after the device is powered on.
In a preferred embodiment, the outer diameter of the metal post 15 is greater than or equal to the outer diameter of the coaxial outer conductor 13.
In this embodiment, by the arrangement of the above-described scheme, the radiation efficiency can be effectively improved.
In a preferred embodiment, the first forming tube 20 is a clearance fit with the coaxial outer conductor 13, the inner drive tube 31 is a clearance fit with the cooling tube 16, and the second forming tube 32 is a clearance fit with the cooling tube 16.
In this embodiment, by the above arrangement, it is easy to reduce friction between the first forming tube 20 and the coaxial outer conductor 13, the inner driving tube 31 and the cooling tube 16, and the second forming tube 32 and the cooling tube 16, and further it is easy to adjust the positions of the first forming tube 20, the inner driving tube 31 and the second forming tube 32.
In a preferred embodiment, the third forming tube 42 is made of one of the following materials: titanium, 316L stainless steel or other biocompatible metal material, in this embodiment, the material of the third forming tube 42 is preferably titanium.
Furthermore, according to the actual requirement, the material of the third excipient 42 may not have biocompatibility, and if the material of the third excipient 42 does not have biocompatibility, a biocompatible coating or film (e.g. PTFE protective film) needs to be added on the outer side of the third excipient 42, so as to avoid immune reaction in the patient after the needle bar 10 and the third excipient 42 penetrate into the focus tissue.
Specifically, the biocompatible metal material is a well-known technology, and has good mechanical properties, corrosion resistance, heat conductivity and workability, and after contacting with a human body or other organisms, the metal material can contact with human tissue for a long time without causing obvious immune reaction, toxic reaction or other adverse reactions, and in this embodiment, the material of the third excipient 42 is preferably titanium.
In the embodiment, the titanium material has the characteristics of light weight, high strength, small elasticity, high temperature resistance, corrosion resistance and the like, does not generate chemical reaction in human body and normal tissue cells and microelements of human body, does not cause the conditions of dyeing, allergy and the like of human body tissues due to the absorption of titanium alloy, and does not induce immune reaction.
Referring again to fig. 2, the needle 11 is a hard needle, and the hard needle is made of one of the following materials: ceramic, fiberglass, or other hard material having non-conductive properties, the shape of the hard needle is one of the following forms: conical, triangular or other needle shape with piercing function.
In this embodiment, the hard needle is provided to have a puncture function, so that the needle can be conveniently punctured into the lesion tissue.
Example two
Referring to fig. 5, the difference between the present embodiment and the first embodiment is the shape and the material of the needle 11, specifically:
The needle 11 is a flexible needle, and the material of the flexible needle is one of the following materials: PTFE, PI or other polymer materials, and the shape of the flexible needle head is circular arc or hemispherical.
It should be noted that, because the flexible needle needs to pass through the natural cavity of the human body, when the needle 11 is a flexible needle, the length of L2 is preferably close to 0.05λ 0, in this embodiment, the value of L2 is 0.05λ 0.
In this embodiment, when the focal tissue in the natural cavity of the human body is ablated, the needle bar 10 is inserted into the focal tissue through the natural cavity of the human body, the focal tissue is ablated, and the flexible needle head is arranged in the process of moving to the focal tissue, so that the damage of the natural cavity of the human body caused by scratching and puncturing of the natural cavity of the human body by the needle head 11 can be avoided.
Example III
The embodiment further describes an initial mode of the device based on the first embodiment, specifically:
referring to fig. 6 to 8, the first forming tube 20 is moved such that the first forming tube 20 covers the length of 0.75L1 (i.e. l3= 0.25L1), the inner driving tube 31 is moved, the second forming tube 32 is driven to move by the inner driving tube 31, the rear end of the second forming tube 32 is flush with the front end of the first forming tube 20, the outer driving tube 41 is moved, the third forming tube 42 is driven to move by the outer driving tube 41, the rear end of the third forming tube 42 is flush with (or slightly coincides with) the front end of the second forming tube 32, after the device is started, the front end of the needle bar 10 forms microwave radiation and generates a microwave electric field, part of the microwave electric field is shielded by the first forming tube 20, the second forming tube 32 and the third forming tube 42, the microwave electric field after the forming is shaped like a sphere, and then an approximately spherical ablation area can be formed in focus tissues, and the ablation device can be applied to lesions with regular shapes or larger sizes.
Example IV
The embodiment further describes a transition mode of the device based on the first embodiment, specifically:
Referring to fig. 9 to 11, the first excipient 20 is moved, so that the first excipient 20 covers the length of 0.6L1 (i.e. l3= 0.4L1), the inner driving tube 31 is moved, the second excipient 32 is driven by the inner driving tube 31 to move away from the needle 11, the outer driving tube 41 is moved, the third excipient 42 is driven by the outer driving tube 41 to move away from the needle 11, so that the front end of the second excipient 32 and the front end of the third excipient 42 both move to the rear end of the first excipient 20 (i.e. the distance between the front end of the first excipient 20 and the needle 11 is smaller than the distance between the front end of the second excipient 32 and the needle 11, and meanwhile, the distance between the front end of the first excipient 20 and the needle 11 is also smaller than the distance between the front end of the third excipient 42 and the needle 11), at this time, the front end of the first excipient 20 is a radiation area, after the device is started, the front end of the needle 10 forms microwave radiation, and generates a microwave electric field, and the front end of the second excipient 32 and the front end of the third excipient 42 and the needle 42 are shielded by the first excipient 20 by the microwave radiation area (i.e. the distance between the front end of the first excipient 20 and the needle 11 and the front end is smaller than the front end of the third excipient 42 and the needle 11), and the front end of the needle 11, and the front end of the needle is far than the needle 11.
It should be noted that, the length of the first forming tube 20 covered L1 may be adjusted according to the shape and size of the focal tissue, and in this embodiment, the length of the first forming tube 20 covered 0.6L1 is illustrated for better describing the working process of the device in the transition mode, which is not particularly limited.
Example five
The present embodiment further describes a limit mode of the device based on the first embodiment, specifically:
Referring to fig. 12 to 14, the first forming tube 20 is moved, so that the first forming tube 20 moves away from the needle 11, the inner driving tube 31 is moved, the second forming tube 32 is driven by the inner driving tube 31 to move away from the needle 11, the outer driving tube 41 is moved, the third forming tube 42 is driven by the outer driving tube 41 to move away from the needle 11, so that the front end of the first forming tube 20, the front end of the second forming tube 32 and the front end of the third forming tube 42 are all located behind the front end of the coaxial outer conductor 13, at this time, the front end of the coaxial outer conductor 13 to the front end of the metal column 15 are all radiation areas (at this time, the length of the radiation areas is l1+l2), after the device is started, the front end of the needle bar 10 forms microwave radiation, at this time, the microwave electric field is approximately long, and then an approximately long strip ablation area can be formed in focal tissues, and can be applied to strip, ribbon or string-shaped ablation of lesion tissues.
Example six
The embodiment is further described based on the first embodiment, and the following details are:
Referring to fig. 4 and 15, the customized rf connector and the mobile structure assembly are also used in combination with the apparatus, and the rf connector and the mobile structure assembly are adapted, specifically:
The movable structure component comprises a structure main body 51, an inner layer supporting tube 52, an outer layer supporting tube 53, a liquid inlet pipeline 54, a liquid outlet pipeline 55 and an adjusting wheel 56, wherein the inner layer supporting tube 52, the outer layer supporting tube 53, the liquid inlet pipeline 54, the liquid outlet pipeline 55 and the adjusting wheel 56 are all assembled on the structure main body 51, the inner layer supporting tube 52 is matched with the adjusting wheel 56, the inner layer supporting tube 52 is connected with the inner layer driving tube 31, the outer layer supporting tube 53 is connected with the outer layer driving tube 41, the liquid inlet pipeline 54 is connected with the cooling pipe 16, the liquid outlet pipeline 55 is connected with the needle bar 10, the cooling pipe 16, the liquid inlet pipeline 54 and the liquid outlet pipeline 55 form a cooling loop for inputting cooling medium, the interior of the needle bar 10 is cooled, and the rotating adjusting wheel 56 can drive the inner layer supporting tube 52 to move and drive the inner layer driving tube 31 to move.
The radio frequency connector comprises a connector main body 61, an extension tube 62 and an adjusting knob 63, wherein the connector main body 61 and the structural main body 51 are connected with each other, the extension tube 62 and the adjusting knob 63 are assembled on the connector main body 61, a connecting structure is arranged inside the connector main body 61 and is connected with a coaxial cable, the extension tube 62 and the adjusting knob 63 are connected with each other, and the extension tube 62 and the first forming tube 20 can be moved through the adjusting knob 63.
Further, the length of the overlapping portion of the extension tube 62 and the first forming tube 20 is greater than or equal to 1.5 times the adjustable length of the first forming tube 20, the length of the overlapping portion of the inner layer support tube 52 and the inner layer drive tube 31 is greater than or equal to 1.5 times the adjustable length of the inner layer drive tube 31, and the length of the overlapping portion of the outer layer support tube 53 and the outer layer drive tube 41 is greater than or equal to 1.5 times the adjustable length of the outer layer drive tube 41.
It should be noted that, the present embodiment is only used as an assembly reference example of the present device, and is not limited in particular, and specific forms of the radio frequency connector and the mobile structure assembly may be adjusted according to actual situations, and may be further optimized based on the present embodiment, which is not described herein in detail.
The working principle of the invention is as follows:
Assembling the rear end of the needle bar 10 on a radio frequency connector, positioning focus tissues through an imaging device, inserting the needle 11 into a focus position, starting the radio frequency connector, enabling the front end of the needle bar 10 to form microwave radiation, generating a microwave electric field, and ablating focus tissues, before inserting the needle 11 into the focus position, adjusting the positions of the first excipient 20, the inner layer driving tube 31 and the outer layer driving tube 41 relative to the needle bar 10 according to the shape of the focus tissues, enabling the device to change among an initial mode, a transition mode and a limit mode, and shielding the microwave electric field at different positions through the first excipient 20, the second excipient 32 and the third excipient 42 when the device is in different working modes, and further shaping the microwave electric field through the cooperation of the first excipient 20, the second excipient 32 and the third excipient 42, and finally obtaining an ablation area similar to the focus shape, wherein when the device is in the initial mode, the shaped microwave electric field is approximately spherical, and then an ablation area similar to the focus tissues can be formed; when the device is in a transition mode, the shaped microwave electric field is approximately elliptic, so that an approximately elliptic ablation area can be formed in focus tissues; when the device is in a limit mode, the shaped microwave electric field is approximately long-strip-shaped, and then an approximately long-strip-shaped ablation area can be formed in focus tissues, so that the device can adjust the shape of the ablation area according to the shape of the focus tissues.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention. Structures, devices and methods of operation not specifically described and illustrated herein, unless otherwise indicated and limited, are implemented according to conventional means in the art.
Claims (9)
1. An ablation zone reconfigurable ablation needle comprising a needle shaft (10), characterized in that: the one end of needle bar (10) is provided with syringe needle (11), the inside of needle bar (10) is fixed with coaxial cable, coaxial cable includes coaxial inner core (12), coaxial outer conductor (13) and dielectric layer (14), coaxial inner core (12) are fixed in the inside of needle bar (10), coaxial outer conductor (13) assemble in the outside of coaxial inner core (12), dielectric layer (14) set up between coaxial inner core (12) and coaxial outer conductor (13), the one end that coaxial inner core (12) is close to syringe needle (11) is fixed with metal column (15), the inside of needle bar (10) and the outside that is located dielectric layer (14) are fixed with cooling tube (16), still include:
A first forming tube (20), wherein the first forming tube (20) is connected to the outer side of the coaxial outer conductor (13) in a sliding manner, and the first forming tube (20) is electrically connected with the coaxial outer conductor (13);
The inner shaping assembly (30), the inner shaping assembly (30) comprises an inner layer driving tube (31) and a second shaping tube (32), the inner layer driving tube (31) is connected to the outer side of the cooling tube (16) in a sliding mode, and the second shaping tube (32) is fixed at one end, close to the needle head (11), of the inner layer driving tube (31);
The outer shaping assembly (40), the outer shaping assembly (40) comprises an outer driving tube (41) and a third shaping tube (42), the outer driving tube (41) is connected to the outer side of the needle bar (10) in a sliding mode, and the third shaping tube (42) is fixed at one end, close to the needle head (11), of the outer driving tube (41);
Wherein the operating mode of the device is switchable between an initial mode, a transition mode and a limit mode by adjusting the position of said first forming tube (20), inner forming assembly (30), outer forming assembly (40) relative to the needle bar (10).
2. An ablation region reconfigurable ablation needle according to claim 1, wherein: the distance between the coaxial outer conductor (13) and the metal column (15) in the extending direction of the needle bar (10) is recorded as L1 and 0.1lambda 0≤L1≤0.75λ0, wherein lambda 0 refers to the microwave wavelength in vacuum.
3. An ablation region reconfigurable ablation needle according to claim 1, wherein: the length of the metal column (15) in the extending direction of the needle bar (10) is recorded as L2 and 0.05lambda 0≤L2≤0.15λ0.
4. An ablation region reconfigurable ablation needle according to claim 1, wherein: the distance between the first forming tube (20) and the metal column (15) in the horizontal direction is L3, and L3 is more than or equal to 1.5mm.
5. An ablation region reconfigurable ablation needle according to claim 1, wherein: the outer diameter of the metal post (15) is larger than or equal to the outer diameter of the coaxial outer conductor (13).
6. An ablation region reconfigurable ablation needle according to claim 1, wherein: the first forming tube (20) is in clearance fit with the coaxial outer conductor (13), the inner layer driving tube (31) is in clearance fit with the cooling tube (16), and the second forming tube (32) is in clearance fit with the cooling tube (16).
7. An ablation region reconfigurable ablation needle according to claim 1, wherein: the third forming tube (42) is made of one of the following materials: titanium, 316L stainless steel or other biocompatible metal materials.
8. An ablation region reconfigurable ablation needle according to claim 1, wherein: the needle head (11) is a hard needle head, and the hard needle head is made of one of the following materials: ceramic, fiberglass or other hard material having non-conductive properties, the shape of the hard needle being one of the following forms: conical, triangular or other needle shape with piercing function.
9. An ablation region reconfigurable ablation needle according to claim 1, wherein: the needle head (11) is a flexible needle head, and the material of the flexible needle head is one of the following materials: PTFE, PI or other high polymer materials, and the shape of the flexible needle head is circular arc or hemispherical.
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