CN112472289B - Microwave ablation needle - Google Patents
Microwave ablation needle Download PDFInfo
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- CN112472289B CN112472289B CN202011479024.1A CN202011479024A CN112472289B CN 112472289 B CN112472289 B CN 112472289B CN 202011479024 A CN202011479024 A CN 202011479024A CN 112472289 B CN112472289 B CN 112472289B
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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
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/04—Cable-end sealings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/03—Cooling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0406—Details thereof
- H02G3/0412—Heat or fire protective means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0462—Tubings, i.e. having a closed section
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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
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
- A61B2018/183—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves characterised by the type of antenna
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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
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
- A61B2018/1869—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves with an instrument interstitially inserted into the body, e.g. needles
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Abstract
A microwave ablation needle comprises an ablation needle body, wherein a non-stick coating is arranged on the outer side surface of the ablation needle body, the ablation needle body comprises a needle head, an insulating sleeve, an outer needle wall and a coaxial cable, the insulating sleeve is arranged on the outer side surface of the needle head and connected with the outer needle wall, the coaxial cable is arranged inside the outer needle wall, and a cavity body for containing cooling liquid for cooling the coaxial cable is arranged between the coaxial cable and the outer needle wall; the coaxial cable comprises a coaxial cable inner core, the coaxial cable inner core extends forwards to expose the part to form the front end of the coaxial cable inner core, the front end of the coaxial cable inner core is fixedly connected with the rear end of the needle head, and metal powder is arranged at the joint of the front end of the coaxial cable inner core and the rear end of the needle head. The invention avoids adopting a welding mode, reduces the difficulty of engineering realization, is simpler in processing and assembly, ensures the good electrical conductivity and thermal conductivity of the ablation needle, and can bring better effect in a proper application scene.
Description
Technical Field
The invention relates to the field of microwave therapeutic instruments, in particular to a microwave ablation needle.
Background
The microwave ablation technology is widely applied to clinical medicine, comprises the treatment of tumors such as liver, lung, thyroid, mammary gland, kidney, bone tumor and the like, and has the advantages of small wound surface, less bleeding, high safety and less complications in operation. Microwave is generated by a microwave source (such as a magnetron, a solid microwave source and the like), the microwave is conducted to an ablation needle through a connecting line, the ablation needle is equivalent to an antenna, the microwave is released, polar molecules (such as water molecules) in tissues are driven by the microwave to do high-frequency oscillation motion, heat is generated by friction, and the protein of tumor cells at the focus is denatured and solidified, so that the treatment effect of killing the tumor cells is achieved. Because the ablation needle is thin, the microwave transmission line inside the ablation needle is thin, the microwave transmission in the thin coaxial cable can generate large loss, the specific expression is heating, at the moment, if the microwave transmission line is not cooled, the cable can be burnt, and therefore, a set of water cooling system is arranged inside the ablation needle, the water cooling circulation needs to be firstly switched on before the microwave is switched on, and the safety of the cable is ensured.
Chinese utility model patent specification CN204708984U discloses a high-strength microwave ablation needle. It comprises a radiation antenna, a matching insulation sleeve, a microwave transmission cable, a needle bar and a handle; the radiation antenna is connected with the inner conductor of the microwave transmission cable, and the matching insulation sleeve plays the roles of impedance matching and electrical insulation between the radiation antenna and the needle rod. The matching insulating sleeve adopts ceramic with high strength, good toughness, low loss and high dielectric constant as an impedance matching and insulating material between the radiation antenna and the needle rod. The T-shaped step at the joint of the insulating sleeve and the needle rod is matched to adopt an R-shaped fillet transition structure, so that the structural defect that right-angle transition is easy to break is overcome. However, from the process point of view, the method of the utility model adopting hot-press casting molding still has the common defects of pits, wrinkles, bubbles, deformation, cracking and the like.
Chinese patent specification CN101711705B discloses a microwave ablation needle and a microwave ablation therapeutic apparatus thereof, which relates to a structure of a microwave ablation needle and a microwave ablation therapeutic apparatus using the same. The microwave ablation needle mainly comprises an ablation needle head, an ablation needle tube, a microwave coaxial cable, a capillary tube, a handle with a crank and a temperature sensor; the water circulation device also comprises a fixing frame comprising a high-frequency joint, a water inlet joint, a water outlet joint and an external socket of the temperature sensor connecting terminal, and a water cavity used for cold water circulation is arranged in the high-frequency joint comprising a locking spring plate and the handle. Circulating water enters the capillary tube from the water inlet connector, enters the water cavity from the ablation needle tube and finally flows out from the water outlet connector. According to the invention, one or more capillaries are used for transmitting cooling liquid, so that a better cooling effect is not easy to obtain in the small ablation needle, and the capillaries are easy to block.
The connection mode of the needle head inside the microwave ablation needle and the cable conductor is welded mostly, a welding point needs to be reserved in a welding mode, the insulating sleeve wall is thin, the needle head connection strength is low, welding requirements on the process are high, product consistency is difficult to guarantee in manual welding, and potential safety hazards such as insufficient welding are caused easily.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a microwave ablation needle, which is more convenient to assemble, simplifies the process, and can improve the product consistency and ensure the product quality.
The invention provides a microwave ablation needle, which comprises an ablation needle body, wherein a non-stick coating is arranged on the outer side surface of the ablation needle body, and a scale mark is arranged at the position of every 10mm, so that the depth can be conveniently judged by a doctor. The ablation needle main body comprises a needle head, an insulating sleeve, an outer needle wall and a coaxial cable, wherein the insulating sleeve is arranged on the outer side surface of the needle head, the insulating sleeve is connected with the outer needle wall, the coaxial cable is arranged inside the outer needle wall, and a cavity body for containing cooling liquid for cooling the coaxial cable is arranged between the coaxial cable and the outer needle wall; the coaxial cable comprises a coaxial cable inner core, the coaxial cable inner core extends forwards to expose the part to form the front end of the coaxial cable inner core, the front end of the coaxial cable inner core is fixedly connected with the rear end of the needle head, and metal powder is arranged at the joint of the front end of the coaxial cable inner core and the rear end of the needle head.
Preferably, the coaxial cable further comprises an insulating layer and a shielding layer, the inner core of the coaxial cable, the insulating layer and the shielding layer are coaxially arranged from inside to outside, and the inner core of the coaxial cable and the shielding layer are spaced by the insulating layer; the coaxial cable inner core front end extends forward relative to the shielding layer and exposes, specifically: the insulating layer extends forwards relative to the shielding layer to be exposed, the inner core of the coaxial cable extends forwards relative to the insulating layer to be exposed, and the insulating layer is hermetically connected with the rear end of the needle head through a sealing connecting ring I; the outer side surface of the front end of the coaxial cable is hermetically connected with the outer needle wall through a sealing connection ring II.
Preferably, a hollow tube is further arranged in the outer needle wall, the hollow tube is communicated with a cavity body positioned outside the coaxial cable, and the cooling liquid can enter the cavity body along the hollow tube; the hollow tube and the coaxial cable are arranged side by side, so that the cavity body is positioned between the inside of the outer needle wall and the outside of the hollow tube as well as the outside of the coaxial cable;
or the hollow tube and the coaxial cable are coaxially arranged, so that the cavity body is positioned between the inside of the outer needle wall and the outside of the hollow tube, the cross section area of the hollow tube is larger relative to the cross section areas arranged side by side, and the pipeline is not easily blocked.
During the use, the coolant liquid flows in from the hollow tube, and the coolant liquid moves back after the head, and the coolant liquid flows through coaxial cable's shielding layer outer wall, takes away the heat that produces in most coaxial cable, realizes coaxial cable's cooling.
Wherein, strip a part with the coaxial cable outer conductor, expose a section inside insulating layer, strip a part of insulating layer again, expose a section coaxial cable inner core, the coaxial cable inner core inserts in the slotted hole of syringe needle rear end, fills through the metal powder around, avoids adopting welded mode, has reduced the degree of difficulty that the engineering was realized, keeps good electric conductivity and heat conductivity, then sealed connection circle I of reuse and sealed connection circle II seal up and keep apart.
Preferably, the rear end of the needle head is processed into a wedge-shaped surface, the wedge-shaped surface is simpler in structural processing, the front end of the inner core of the coaxial cable is embedded between the wedge-shaped surface at the rear end of the needle head and the insulating sleeve, and the outer surface of the inner core of the coaxial cable on the wedge-shaped surface at the rear end of the needle head is filled and wrapped with metal powder.
Preferably, the shielding layer front end is connected in sealing connection circle II, and this sealing connection circle II sets up in insulating cover rear end, and this sealing connection circle II and outer needle wall medial surface sealing connection, and sealing connection circle II that adopts heat-resisting sealed glue material has not only guaranteed joint strength and leakproofness, has also avoided the welding flow simultaneously, convenient assembly.
Preferably, the insulating sleeve wraps the needle main body part and extends forwards to the front end part of the needle, and the insulating sleeve is an insulating ceramic tube.
Preferably, because of the poor adhesion of ceramic materials (compared with metal materials), the insulating sleeve is made of polytetrafluoroethylene insulating tube, so that the insulating sleeve has better lubricity and ensures the insulation between the needle head and the outer wall of the needle, and the insulating sleeve has the defects of lower rigidity compared with the ceramic tube, possible deformation and even melting under high temperature and possible falling of the needle head.
Preferably, the outer needle wall is made of stainless steel or titanium alloy; the metal powder is silver powder, gold powder or tin powder.
Compared with the prior art, the invention has the beneficial effects that:
the ablation needle head of the invention realizes the connection between the needle head and the coaxial cable by adopting the modes of lapping and metal powder filling, avoids adopting a welding process, reduces the difficulty of engineering realization, and keeps good electrical conductivity and thermal conductivity; from the assembly order, avoid adopting insulating ceramic pipe or adopting the internal diameter of the insulating tube of polytetrafluoroethylene material to be greater than coaxial cable's external diameter (otherwise unable welding), can increase the wall thickness of insulating cover to a certain extent, improved the intensity of syringe needle, avoid the fracture of needle in the art, improved the security of melting the needle.
Drawings
Fig. 1 is a schematic sectional view of a microwave ablation needle according to an embodiment 1 of the present invention;
fig. 2 is a schematic sectional view of a microwave ablation needle according to an embodiment 2 of the present invention;
fig. 3 is a schematic sectional view of a microwave ablation needle according to an embodiment 3 of the present invention;
fig. 4 is a schematic cross-sectional view of a microwave ablation needle according to an embodiment 4 of the present invention;
FIG. 5 is a schematic cross-sectional view of a coaxial cable in a microwave ablation needle according to the present invention;
fig. 6 is a schematic cross-sectional view of a microwave ablation needle with a hollow tube and a hollow body coaxially arranged.
Icon 1-needle; 11-front end of needle; 12-needle body part; 2-an insulating sleeve; 3-outer needle wall; 41-sealing connection ring I; 42-sealing the connecting ring II; 5-metal powder; 6-inner core of coaxial cable; 7-an insulating layer; 8-a shielding layer; 9-a hollow tube; 10-a cavity body; 13-coaxial cable.
Detailed Description
The embodiments of the present invention will be described in detail below, and the embodiments described below by referring to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Example 1:
as shown in fig. 1, a microwave ablation needle comprises an ablation needle body, wherein the ablation needle body comprises a needle head 1, an insulating sleeve 2, an outer needle wall 3 and a coaxial cable 13, a non-stick coating is arranged on the outer side surface of the ablation needle body, and a scale mark is arranged at a position of every 10mm, so that a doctor can conveniently judge the depth, the non-stick coating is a coating made of polytetrafluoroethylene, the coating needs to be added because human tissues can be adhered to the needle body 1 after the needle head 1 generates heat, and if the coating is not arranged, serious tearing injury can be caused when the needle is pulled out. Insulating cover 2 adopts insulating ceramic tube, sets up the lateral surface at syringe needle main part 12, outer needle wall 3 is the outer wall that adopts stainless steel or titanium alloy material to make, and outer needle wall 3 is connected with insulating cover 2, coaxial cable 13 sets up inside outer needle wall 3, is provided with cavity body 10 between coaxial cable and outer needle wall 3, and this cavity body 10 is used for holding the coolant liquid that carries out the cooling to coaxial cable 13, still is provided with hollow tube 9 in outer needle wall 3, and this hollow tube 9 communicates with the cavity body 10 that is located the coaxial cable 13 outside, and during the use, coolant liquid flows in from hollow tube 9, and the coolant liquid moves back after arriving the head, and the coolant liquid flows through 8 outer walls of shielding layer, takes away the heat that most coaxial cable inner core 6 produced, realizes coaxial cable 13's cooling. The hollow tube 9 and the coaxial cable 13 are arranged side by side, so that the hollow cavity 10 is positioned between the inside of the outer needle wall 3 and the outside of the hollow tube 9 and the outside of the coaxial cable 13; alternatively, as shown in fig. 6, the hollow tube 9 is coaxially arranged with the coaxial cable, so that the hollow body 10 is located between the inside of the outer needle wall 3 and the outside of the hollow tube 9, so that the hollow tube 9 has a larger cross-sectional area than that of the side-by-side arrangement, and is less likely to block the pipeline.
As shown in fig. 5, the coaxial cable 13 includes a coaxial cable core 6, the coaxial cable core 6 extends forward to expose a portion to form a front end of the coaxial cable core 6, the front end of the coaxial cable core 6 is fixedly connected with the rear end of the needle 1, which is specifically represented as: the front end of the coaxial cable inner core 6 is inserted into the rear end of the needle head 1, the joint of the front end of the coaxial cable inner core 6 and the rear end of the needle head 1 is filled and wrapped with metal powder 5, and the metal powder 5 is made of silver powder, gold powder or tin powder, so that excellent heat conduction performance is guaranteed, a welding mode is avoided, and the difficulty of engineering realization is reduced.
The coaxial cable 13 further comprises an insulating layer 7 and a shielding layer 8, the coaxial cable inner core 6, the insulating layer 7 and the shielding layer 8 are coaxially arranged from inside to outside, the insulating layer 7 extends forwards relative to the shielding layer 8 and is exposed, the coaxial cable inner core 6 extends forwards relative to the insulating layer 7 and is exposed, and the insulating layer 7 is hermetically connected with the rear end of the needle 1 through a sealing connecting ring I41; the outer side surface of the front end of the coaxial cable 13 is hermetically connected with the outer needle wall 3 through a sealing connecting ring II 42. The front end of the shielding layer 8 is connected in a sealing connection ring II 42, the sealing connection ring II 42 is arranged at the rear end of the insulating sleeve 2, and the sealing connection ring II 42 is connected with the inner side surface of the outer needle wall 3 in a sealing mode. Wherein the sealing connecting ring I41 and the sealing connecting ring II 42 both adopt heat-resistant sealant; the shielding layer 8 is a coaxial cable outer conductor.
Example 2:
as shown in fig. 2, a microwave ablation needle comprises an ablation needle body, wherein the ablation needle body comprises a needle head 1, an insulating sleeve 2, an outer needle wall 3 and a coaxial cable 13, a non-stick coating is arranged on the outer side surface of the ablation needle body, and a scale mark is arranged at a position every 10mm, so that a doctor can conveniently judge the depth, the non-stick coating is a coating made of polytetrafluoroethylene, the coating needs to be added because human tissues can be adhered to the needle body 1 after the needle head 1 generates heat, and if the coating is not arranged, serious tearing injury can be caused when the needle is pulled out. Insulating cover 2 adopts insulating ceramic tube, sets up the lateral surface at syringe needle main part 12, outer needle wall 3 is the outer wall that adopts stainless steel or titanium alloy material to make, and outer needle wall 3 is connected with insulating cover 2, coaxial cable 13 sets up inside outer needle wall 3, is provided with cavity body 10 between coaxial cable 13 and outer needle wall 3, and this cavity body 10 is used for holding the coolant liquid that carries out the cooling to coaxial cable 13, still is provided with hollow tube 9 in outer needle wall 3, and this hollow tube 9 communicates with the cavity body 10 that is located the coaxial cable 13 outside, and during the use, coolant liquid flows in from hollow tube 9, and the coolant liquid moves back after the head, and the coolant liquid flows through 8 outer walls of shielding layer, takes away the heat that most coaxial cable inner core 6 produced, realizes coaxial cable 13's cooling. The hollow tube 9 and the coaxial cable are arranged side by side, so that the hollow cavity 10 is positioned between the inside of the outer needle wall 3 and the outside of the hollow tube 9 and the outside of the coaxial cable 13; alternatively, as shown in fig. 6, the hollow tube 9 is coaxially arranged with the coaxial cable, so that the hollow body 10 is located between the inside of the outer needle wall 3 and the outside of the hollow tube 9, so that the hollow tube 9 has a larger cross-sectional area than that of the side-by-side arrangement, and is less likely to block the pipeline.
As shown in fig. 5, the coaxial cable 13 includes a coaxial cable core 6, the coaxial cable core 6 extends forward to expose a portion to form a front end of the coaxial cable core 6, the front end of the coaxial cable core 6 is fixedly connected with the rear end of the needle 1, which is specifically represented as: the rear end of the needle head 1 is processed into a wedge-shaped surface, the processing is simpler, the front end of the coaxial cable inner core 6 is embedded between the wedge-shaped surface at the rear end of the needle head and the insulating sleeve 2, the metal powder 5 is filled and wrapped outside the coaxial cable inner core 6 positioned on the wedge-shaped surface at the rear end of the needle head, the metal powder 5 adopts silver powder, gold powder or tin powder, excellent conductivity is guaranteed, a welding mode is avoided, and the difficulty of engineering realization is reduced.
The coaxial cable 13 further comprises an insulating layer 7 and a shielding layer 8, the coaxial cable inner core 6, the insulating layer 7 and the shielding layer 8 are coaxially arranged from inside to outside, the insulating layer 7 extends forwards relative to the shielding layer 8 and is exposed, the coaxial cable inner core 6 extends forwards relative to the insulating layer 7 and is exposed, and the insulating layer 7 is hermetically connected with the rear end of the needle 1 through a sealing connecting ring I41; the outer side surface of the front end of the coaxial cable 13 is hermetically connected with the outer needle wall 3 through a sealing connecting ring II 42. The front end of the shielding layer 8 is connected in a sealing connection ring II 42, the sealing connection ring II 42 is arranged at the rear end of the insulating sleeve 2, and the sealing connection ring II 42 is connected with the inner side surface of the outer needle wall 3 in a sealing mode. Wherein the sealing connecting ring I41 and the sealing connecting ring II 42 both adopt heat-resistant sealant; the shielding layer 8 is a coaxial cable outer conductor.
Example 3:
as shown in fig. 3, a microwave ablation needle comprises an ablation needle body, wherein the ablation needle body comprises a needle head 1, an insulating sleeve 2, an outer needle wall 3 and a coaxial cable 13, a non-stick coating is arranged on the outer side surface of the ablation needle body, the non-stick coating is a coating made of polytetrafluoroethylene, and a scale mark is arranged at a position of every 10mm, so that a doctor can conveniently judge the depth, the coating needs to be added because human tissues can be adhered to the needle body 1 after the needle head 1 is heated, and if the coating is not arranged, serious tearing injury can be caused when the needle is pulled out. The insulating sleeve 2 is arranged on the outer side surface of the needle head main body part 12, and because the ceramic material has poor adhesion (relative to a metal material), the insulating sleeve in the embodiment adopts an insulating tube made of polytetrafluoroethylene, so that the insulating sleeve has better lubricity, and simultaneously ensures the insulation between the needle head and the outer wall of the needle. Outer needle wall 3 is the outer wall that adopts stainless steel material or titanium alloy material to make, and outer needle wall 3 is connected with insulating cover 2, coaxial cable 13 sets up inside outer needle wall 3, is provided with cavity body 10 between coaxial cable and outer needle wall 3, and this cavity body 10 is used for holding the coolant liquid that carries out the cooling to coaxial cable 13, still is provided with hollow tube 9 in outer needle wall 3, and this hollow tube 9 communicates with the cavity body 10 that is located coaxial cable 13 outside, during the use, the coolant liquid flows in from hollow tube 9, and the coolant liquid moves back after arriving the head, and the coolant liquid flows through 8 outer walls of shielding layer, takes away the heat that most coaxial cable inner core 6 produced, realizes coaxial cable 13's cooling. The hollow tube 9 and the coaxial cable are arranged side by side, so that the hollow cavity 10 is positioned between the inside of the outer needle wall 3 and the outside of the hollow tube 9 and the outside of the coaxial cable 13; alternatively, the hollow tube 9 and the coaxial cable are coaxially arranged, so that the hollow cavity 10 is positioned between the inside of the outer needle wall 3 and the outside of the hollow tube 9, and thus the cross section area of the hollow tube 9 is larger relative to that of the hollow tube arranged side by side, and the pipeline is less prone to blockage.
As shown in fig. 5, the coaxial cable 13 includes a coaxial cable core 6, the coaxial cable core 6 extends forward to expose a portion to form a front end of the coaxial cable core 6, the front end of the coaxial cable core 6 is fixedly connected with the rear end of the needle 1, which is specifically represented as: the front end of the coaxial cable inner core 6 is inserted into the rear end of the needle head 1, the joint of the front end of the coaxial cable inner core 6 and the rear end of the needle head 1 is filled and wrapped with metal powder 5, and the metal powder 5 is made of silver powder, gold powder or tin powder, so that excellent conductivity is guaranteed, a welding mode is avoided, and the difficulty in engineering realization is reduced.
The coaxial cable 13 further comprises an insulating layer 7 and a shielding layer 8, the coaxial cable inner core 6, the insulating layer 7 and the shielding layer 8 are coaxially arranged from inside to outside, the insulating layer 7 extends forwards relative to the shielding layer 8 and is exposed, the coaxial cable inner core 6 extends forwards relative to the insulating layer 7 and is exposed, and the insulating layer 7 is hermetically connected with the rear end of the needle 1 through a sealing connecting ring I41; the outer side surface of the front end of the coaxial cable 13 is hermetically connected with the outer needle wall 3 through a sealing connecting ring II 42. The front end of the shielding layer 8 is connected in a sealing connection ring II 42, the sealing connection ring II 42 is arranged at the rear end of the insulating sleeve 2, and the sealing connection ring II 42 is connected with the inner side surface of the outer needle wall 3 in a sealing mode. Wherein the sealing connecting ring I41 and the sealing connecting ring II 42 both adopt heat-resistant sealant; the shielding layer 8 is a coaxial cable outer conductor.
Example 4:
as shown in fig. 4, a microwave ablation needle comprises an ablation needle body, wherein the ablation needle body comprises a needle head 1, an insulating sleeve 2, an outer needle wall 3 and a coaxial cable 13, a non-stick coating is arranged on the outer side surface of the ablation needle body, the non-stick coating is a coating made of polytetrafluoroethylene, and a scale mark is arranged at a position of every 10mm, so that a doctor can conveniently judge the depth, the coating needs to be added because human tissues can be adhered to the needle body 1 after the needle head 1 is heated, and if the coating is not arranged, serious tearing injury can be caused when the needle is pulled out. The insulating sleeve 2 is arranged on the outer side surface of the needle head main body part 12, and because the ceramic material has poor adhesion (relative to a metal material), the insulating sleeve in the embodiment adopts an insulating tube made of polytetrafluoroethylene, so that the insulating sleeve has better lubricity, and simultaneously ensures the insulation between the needle head and the outer wall of the needle. Outer needle wall 3 is the outer wall that adopts stainless steel material or titanium alloy material to make, and outer needle wall 3 is connected with insulating cover 2, coaxial cable 13 sets up inside outer needle wall 3, is provided with cavity body 10 between coaxial cable and outer needle wall 3, and this cavity body 10 is used for holding the coolant liquid that carries out the cooling to coaxial cable 13, still is provided with hollow tube 9 in outer needle wall 3, and this hollow tube 9 communicates with the cavity body 10 that is located coaxial cable 13 outside, during the use, the coolant liquid flows in from hollow tube 9, and the coolant liquid moves back after arriving the head, and the coolant liquid flows through 8 outer walls of shielding layer, takes away the heat that most coaxial cable inner core 6 produced, realizes coaxial cable 13's cooling. The hollow tube 9 and the coaxial cable are arranged side by side, so that the hollow cavity 10 is positioned between the inside of the outer needle wall 3 and the outside of the hollow tube 9 and the outside of the coaxial cable 13; alternatively, the hollow tube 9 and the coaxial cable are coaxially arranged, so that the hollow cavity 10 is positioned between the inside of the outer needle wall 3 and the outside of the hollow tube 9, and thus the cross section area of the hollow tube 9 is larger relative to that of the hollow tube arranged side by side, and the pipeline is less prone to blockage.
As shown in fig. 5, the coaxial cable 13 includes a coaxial cable core 6, the coaxial cable core 6 extends forward to expose a portion to form a front end of the coaxial cable core 6, the front end of the coaxial cable core 6 is fixedly connected with the rear end of the needle 1, which is specifically represented as: the rear end of the needle head 1 is processed into a wedge-shaped surface, the processing is simpler, the front end of the coaxial cable inner core 6 is embedded between the wedge-shaped surface at the rear end of the needle head and the insulating sleeve 2, the metal powder 5 is filled and wrapped outside the coaxial cable inner core 6 positioned on the wedge-shaped surface at the rear end of the needle head, the metal powder 5 adopts silver powder, gold powder or tin powder, excellent conductivity is guaranteed, a welding mode is avoided, and the difficulty of engineering realization is reduced.
The coaxial cable 13 further comprises an insulating layer 7 and a shielding layer 8, the coaxial cable inner core 6, the insulating layer 7 and the shielding layer 8 are coaxially arranged from inside to outside, the insulating layer 7 extends forwards relative to the shielding layer 8 and is exposed, the coaxial cable inner core 6 extends forwards relative to the insulating layer 7 and is exposed, and the insulating layer 7 is hermetically connected with the rear end of the needle 1 through a sealing connecting ring I41; the outer side surface of the front end of the coaxial cable 13 is hermetically connected with the outer needle wall 3 through a sealing connecting ring II 42. The front end of the shielding layer 8 is connected in a sealing connection ring II 42, the sealing connection ring II 42 is arranged at the rear end of the insulating sleeve 2, and the sealing connection ring II 42 is connected with the inner side surface of the outer needle wall 3 in a sealing mode. Wherein the sealing connecting ring I41 and the sealing connecting ring II 42 both adopt heat-resistant sealant; the shielding layer 8 is a coaxial cable outer conductor.
In conclusion, the invention optimizes the production process of the ablation needle, reduces the engineering realization difficulty, ensures high-quality electrical conductivity and thermal conductivity, and simultaneously each structure can adapt to various production scenes and use scenes.
Claims (10)
1. The microwave ablation needle is characterized by comprising an ablation needle body, wherein the ablation needle body comprises a needle head (1), an insulating sleeve (2), an outer needle wall (3) and a coaxial cable (13), the insulating sleeve (2) is arranged on the outer side surface of the needle head (1), the insulating sleeve (2) is connected with the outer needle wall (3), the coaxial cable (13) is arranged inside the outer needle wall (3), and a cavity body (10) for containing cooling liquid for cooling the coaxial cable is arranged between the coaxial cable (13) and the outer needle wall (3);
the coaxial cable (13) comprises a coaxial cable inner core (6), an insulating layer (7) and a shielding layer (8), the coaxial cable inner core (6), the insulating layer (7) and the shielding layer (8) are coaxially arranged from inside to outside, and the coaxial cable inner core (6) and the shielding layer (8) are separated by the insulating layer (7);
the front end of the coaxial cable inner core (6) is formed by extending the exposed part forwards, the front end of the coaxial cable inner core (6) is fixedly connected with the rear end of the needle head (1), and metal powder (5) is arranged at the joint of the front end of the coaxial cable inner core (6) and the rear end of the needle head (1).
2. A microwave ablation needle as claimed in claim 1, characterized in that the front end of the coaxial cable core (6) extends forwards relative to the shielding layer (8) and is exposed, and the insulating layer (7) and the rear end of the needle head (1) are hermetically connected through a sealing connection ring I (41); the outer side surface of the front end of the coaxial cable (13) is hermetically connected with the outer needle wall (3) through a sealing connecting ring II (42).
3. A microwave ablation needle according to claim 1, characterized in that a hollow tube (9) is further provided in the outer needle wall (3), the hollow tube (9) communicating with a cavity (10) outside the coaxial cable (13), the cooling fluid being able to pass along the hollow tube (9) into the cavity (10);
the hollow tube (9) and the coaxial cable (13) are arranged side by side, so that the hollow cavity body (10) is positioned between the inside of the outer needle wall (3) and the outside of the hollow tube (9) and the outside of the coaxial cable (13);
or the hollow tube (9) and the coaxial cable (13) are coaxially arranged, so that the hollow cavity body (10) is positioned between the inside of the outer needle wall (3) and the outside of the hollow tube (9).
4. A microwave ablation needle as claimed in claim 1, characterized in that the front end of the coaxial cable inner core (6) is inserted into the slot of the rear end of the needle head (1), and the joint between the coaxial cable inner core (6) in the rear end of the needle head (1) and the rear end of the needle head (1) is filled and wrapped with metal powder (5).
5. A microwave ablation needle as claimed in claim 1, characterized in that the front end of the coaxial cable core (6) is embedded between the wedge-shaped surface at the rear end of the needle head (1) and the insulating sleeve (2), and the outside of the coaxial cable core (6) on the wedge-shaped surface at the rear end of the needle head (1) is filled and wrapped with metal powder (5).
6. A microwave ablation needle as claimed in claim 2, characterized in that the front end of the shielding layer (8) is connected in a sealing connection ring ii (42), the sealing connection ring ii (42) is arranged at the rear end of the insulating sleeve (2), and the sealing connection ring ii (42) is connected with the inner side surface of the outer needle wall (3) in a sealing way.
7. A microwave ablation needle according to claim 1, wherein the insulating sheath (2) surrounds the needle body portion (12) and extends forward to the needle tip portion (11), and the insulating sheath (2) is formed of an insulating ceramic tube.
8. A microwave ablation needle according to claim 1, wherein the insulating sheath (2) surrounds the needle body portion (12) and extends forward to the needle tip portion (11), the insulating sheath (2) being an insulating tube made of teflon.
9. A microwave ablation needle according to claim 1, characterized in that the outer needle wall (3) is made of stainless steel or titanium alloy, and the metal powder (5) is silver powder, gold powder or tin powder.
10. A microwave ablation needle according to claim 1, wherein the outer side of the ablation needle body is provided with a non-stick coating, and the non-stick coating is made of teflon.
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| CN202011479024.1A CN112472289B (en) | 2020-12-15 | 2020-12-15 | Microwave ablation needle |
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| CN202011479024.1A CN112472289B (en) | 2020-12-15 | 2020-12-15 | Microwave ablation needle |
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| CN112472289B true CN112472289B (en) | 2022-03-25 |
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| CN114039209B (en) * | 2021-12-23 | 2024-06-14 | 南京臻泰微波科技有限公司 | Microwave ablation needle adopting hollow inner conductor coaxial cable |
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|---|---|---|---|---|
| CN101711705A (en) * | 2009-11-18 | 2010-05-26 | 南京康友微波能应用研究所 | Microwave ablation needle and microwave ablation therapeutic apparatus thereof |
| CN102215641A (en) * | 2011-05-04 | 2011-10-12 | 深圳市博敏电子有限公司 | Manufacturing process of high-density printed board with holes in pads |
| CN106109009A (en) * | 2016-06-13 | 2016-11-16 | 南京航空航天大学 | A kind of water-cooled microwave ablation needle using 433MHz frequency |
| CN111938809A (en) * | 2020-08-19 | 2020-11-17 | 南京诺源医疗器械有限公司 | Water-cooling type ablation needle |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10959775B2 (en) * | 2011-06-06 | 2021-03-30 | Cosman Instruments, Llc | Cool RF electrode |
| PL2907463T3 (en) * | 2014-02-12 | 2016-08-31 | Erbe Elektromedizin | Surgical instrument with electrode holder |
| CN104323856B (en) * | 2014-11-11 | 2017-07-18 | 南京维京九洲医疗器械研发中心 | Without magnetic water-cooled microwave ablation needle manufacture method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101711705A (en) * | 2009-11-18 | 2010-05-26 | 南京康友微波能应用研究所 | Microwave ablation needle and microwave ablation therapeutic apparatus thereof |
| CN102215641A (en) * | 2011-05-04 | 2011-10-12 | 深圳市博敏电子有限公司 | Manufacturing process of high-density printed board with holes in pads |
| CN106109009A (en) * | 2016-06-13 | 2016-11-16 | 南京航空航天大学 | A kind of water-cooled microwave ablation needle using 433MHz frequency |
| CN111938809A (en) * | 2020-08-19 | 2020-11-17 | 南京诺源医疗器械有限公司 | Water-cooling type ablation needle |
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