CN208404835U - A kind of microwave melt needle with antenna module - Google Patents

Abstract

The utility model provides a kind of microwave melt needle with antenna module, including radiator and the shank being connected with radiator, the radiator includes the radiator antenna of syringe needle and needle wall, radiator antenna includes top loading unit and the coated by dielectric portion being arranged alternately and standard point shape portion, microwave cable is equipped with inside shank, microwave cable includes cable inner core, and cable inner core advances through the coated by dielectric portion being arranged alternately and standard point shape portion and top loading unit.The microwave cable includes cable shield in the part of radiator antenna rear end, and high-temperature insulation medium is socketed with outside cable shield front end.

Description

A kind of microwave melt needle with antenna module

Technical field

The utility model relates to area of medical devices, especially a kind of microwave melt needle with antenna module.

Background technique

In recent years, Microwave Coagulation Therapy has become treatment liver cancer, kidney, the critical treatment means of the soft tissues such as thyroid gland it One.Microwave ablation is using aerial radiation microwave, and microwave makes ion in tissue, polar water molecules whirling vibration, phase mutual friction And generate fuel factor, so that treatment region is rapidly achieved very high temperature, tissue coagulation, dehydration and it is downright bad, to reach treatment mesh 's.

For microwave antenna design above, the ablation needle of mainstream uses typical monopole antenna structure currently on the market, Such as the Chinese patent of publication number CN103142307A, CN104688335A and CN105816240A.

Mainstream microwave ablation antenna all uses coaxial cable by microwave transmission to aerial radiation end, monopole antenna on the market In radiative process, the outer conductor that will lead to coaxial cable forms induced current, uncontrollable so as to cause ablation areas, is formed ellipse It is spherical.Mainstream solution is using chokes ring or choke groove, such as publication number CN104688335A and CN105816240A at present Chinese patent.

During Microwave Coagulation Therapy, since tissue solidifies, phenomena such as dehydration, tissue permittivity is caused to subtract Small, antenna near-field environment acute variation at any time thereby causes a problem in that

(1) it needs just play in the case of 1/4 λ of satisfaction to wave formation high impedance in chokes ring design, reaches inhibition coaxial electrical The induced current of cable appearance conductor.And the dielectric property variation organized, cause chokes ring to inhibit the decline of surface current performance.

(2) antenna near-field environmental change causes monopole antenna radiance sharply to decline, and most of microwave energy will be with Standing wave form consumes on transmission line.

Antenna radiation performance is influenced to reduce tissue permittivity variation, needs the height stable in aerial radiation area filling Dielectric constant dielectric.As publication number patent CN104688335A uses zirconia ceramics.Due to the image of microwave ablation pin puncture Guidance equipment mainly has ultrasound, CT, MRI.Ultrasonic guidance is realtime graphic tracking.And zirconia ceramics develop under ultrasound it is unclear It is clear, limit the application of microwave melt needle clinically.

Typical monopole antenna performance is especially sensitive to the extremely sub- length of antenna, and the diminution of antenna size will lead to antenna spoke Radio resistance reduces, and efficiency reduces, and frequency band narrows.Therefore antenna rows are in the industry using such as fractal technology, bending line technology, load skill Art etc. reduces antenna size, improves antenna radiation resistance, increases the performances such as beamwidth of antenna, wherein loading technique is added to antenna A kind of load, antenna loading can change current distribution on antenna, and the input impedance of antenna is distributed according to certain rules, lead to Antenna size can be shortened by crossing antenna loading, changed antenna and inputted bandwidth.Common loading technique has: top-loaded, medium add It carries, distributed load and lump load.

Sleeve monopole antenna is that sleeve is added outside monopole antenna, and antenna plays radiation by coaxial feed, sleeve outer wall Effect, outer conductor of the inner wall as coaxial feeder.By adjusting sleeve outer diameter, length ratio etc. can be by the bandwidth of monopole Increase to above 1 octave.

Utility model content

Purpose of utility model: technical problem to be solved in the utility model is in view of the deficiencies of the prior art, to provide one Microwave melt needle of the kind with antenna module.

In order to solve the above-mentioned technical problem, the utility model provides a kind of microwave melt needle with antenna module, including Radiator and the shank being connected with radiator, the radiator include the radiator antenna of syringe needle and needle wall, radiator day Line includes top loading unit and the coated by dielectric portion being arranged alternately and standard point shape portion, is equipped with microwave cable, microwave inside shank Cable includes cable inner core, and cable inner core advances through the coated by dielectric portion being arranged alternately and standard point shape portion and top load Portion.

In the utility model, the microwave cable includes cable shield, cable screens in the part of radiator antenna rear end It covers and is socketed with high-temperature insulation medium outside layer front end.

In the utility model, the distance between cable shield front end to coated by dielectric portion is the length of high-temperature insulation medium Two to four times of degree.

In the utility model, the outer ring of high-temperature insulation medium is equipped with sleeve, and barrel forward end extends to the end of needle wall It holds in coated by dielectric portion, sleeve rear end is connected on the microwave cable after high-temperature insulation medium.

In the utility model, cooling channel is equipped between the shank and microwave cable, cooling channel extends to sleeve needle Bar front end, cooling channel is interior to be equipped with coolant liquid, and the heat at radiator antenna is transmitted to coolant liquid, the microwave cable by sleeve Rear end is connected to microwave coaxial connector, and microwave coaxial connector is externally provided with the water tank being connected to cooling channel.

In the utility model, the coated by dielectric portion and standard point shape portion are cannula structure.

In the utility model, the syringe needle outer surface is equipped with the groove of a circle or more, enhances development effect.

In the utility model, the syringe needle outer surface is equipped with one group or more of concave point, enhances development effect.

In the utility model, the coated by dielectric portion has 2 or more, and standard point shape portion has 1 or more.

In the utility model, the microwave cable includes cable inner core, and cable inner core extends to top loading unit.

In the utility model, the syringe needle outer surface is coated with anti-stick coating, prevents from being bonded.

The utility model has the advantages that groove and shrinkage pool is arranged in syringe needle outer surface in the utility model, enhance ultrasound guidance microwave ablation The development effect for the treatment of.

The utility model is provided with top-loaded, and coated by dielectric and standard divide shape sleeve monopole antenna, improve antenna Bandwidth increases antenna electrical length, slows down influence of the ablation tissue change in dielectric constant to antenna radiation performance.Make to melt Needle radiation areas are more stable, improve the draw ratio of ablation of tissue form, close to spheroidal, are convenient for doctor's clinical treatment.

Detailed description of the invention

The utility model is done with reference to the accompanying drawings and detailed description and is further illustrated, the utility model Above-mentioned or otherwise advantage will become apparent.

Fig. 1 is antenna module main body cross-sectional view；

Fig. 2 a is needle head structure schematic diagram 1；

Fig. 2 b is needle recess schematic diagram 1；

Fig. 3 a is needle head structure schematic diagram 2；

Fig. 3 b is needle recess schematic diagram 2；

Fig. 4 a is needle head structure schematic diagram 3；

Fig. 4 b is syringe needle shrinkage pool schematic diagram 1；

Fig. 5 a is needle head structure schematic diagram 4；

Fig. 5 b is syringe needle shrinkage pool schematic diagram 2；

Fig. 6 a is 1 sectional view of top-loaded portion；

Fig. 6 b is 2 sectional view of top-loaded portion；

Fig. 6 c is 3 sectional view of top-loaded portion；

Fig. 6 d is 4 sectional view of top-loaded portion；

Fig. 7 is antenna module schematic internal view；

Fig. 8 is coated by dielectric portion cross-sectional view；

Fig. 9 is standard point shape portion cross-sectional view；

Figure 10 is straight type handle portion schematic diagram；

Figure 11 is L-type handle schematic diagram.

Specific embodiment

It elaborates below in conjunction with attached drawing to the utility model.

Embodiment:

Such as Fig. 1, a kind of microwave melt needle with antenna module provided in this embodiment, including radiator and with radiator phase Shank 8 even, radiator include syringe needle 1, high-temperature insulation medium 2, standard point shape portion 3, coated by dielectric portion 4, microwave cable 5, electricity Cable inner core 6, sleeve 7, shank 8, anti-stick coating 9, top loading unit 10 and cooling channel 11, top loading unit 10, standard divide shape portion 3, the cable inner core 6 of coated by dielectric portion 4 and microwave cable 5 is electrically connected, and sleeve 7 and 5 external shielding layer of microwave cable are electrically connected； 1 inside of high-strength insulating syringe needle is socketed with antenna top loading unit 10, standard point shape portion 3, coated by dielectric portion 4 and sleeve 7, It is bonded using refractory ceramics glue, glue can select fire resistant epoxy class glue or inorganic high-temperature resistant glue, heatproof to want It asks at 200 DEG C or more.Cable includes cable shield 5a, insulating medium layer 5b and cable inner core 6, outside the front end cable shield 5a Portion is socketed with high-temperature insulation medium 2, and the outer ring of high-temperature insulation medium 2 is equipped with sleeve 7, and 7 front end of sleeve extends in syringe needle 1 Portion, 7 rear end of sleeve are connected on the microwave cable 5 after high-temperature insulation medium 2.

The groove 19 of one or more is equipped with such as Fig. 2 a and 2b, outside syringe needle 1, notch shape is semicircle.

The material that high-strength insulating syringe needle 1 uses is the ceramic material with toughening performance, such as Zirconia-stabilized aluminium oxide, Magnesia partial stabilized zirconia, the materials such as yttrium oxide partially stabilized zirconia.Needle surface is coated with resistant to high temperature simultaneously, tool There are the tissue sticking resistant coating 9 for meeting biocompatibility, such as PTFE coating.

The utility model antenna module part syringe needle outer surface is with circular arc or conical socket ultrasonic development enhancing ring or shows Shadow shrinkage pool, from structure design, different ultrasonic probes can for the ultrasonic wave of different frequency using different ultrasonic frequencies To adjust the radian and depth of groove and shrinkage pool, to change the reflection path of ultrasonic wave, and it is reflected back ultrasonic probe, reaches improvement Development effect of the microwave melt needle in the operation of ultrasonic guidance microwave ablation, does not need additionally to spray ultrasonic development coating.

Aerial head loading section 10 is electrically connected with microwave cable inner core 6, and connection method can use soldering, is swashed Flush weld, the methods of soldering etc., can select various conductive metals, such as copper, iron, aluminium, gold, silver or its alloy on material, wherein It is preferred that copper, metal surface copper facing or copper class alloy material, top-loaded can need and processing method according to Antenna Impedance Matching Difference can use various shape, and such as Fig. 6 a, top-loaded portion 10 uses disc-shaped structure.

If the top-loaded portion 10 shown Fig. 6 a is disc-shaped structure, cylinder height L1 is between 0.1mm~1mm, preferably 0.6mm；The utility model aerial head loading unit 10 can be effectively improved the beamwidth of antenna, Antenna Impedance Matching and antenna table The electric field and current distribution in face improve microwave melt needle under tissue permittivity changing condition, improve Antenna Impedance Matching, will More energy is radiated ablation tissue；

Antenna medium loading unit 4 can select various high temperature resistants, the microwave-medium insulation material of high dielectric constant on material Material, such as microwave-medium ceramics, under 2.45GHz frequency, material medium constant need to be greater than 15 or more, and heatproof need to be greater than 200 DEG C The above microwave-medium ceramics

Antenna medium loading unit 4 is wrapped on microwave cable inner core in Fig. 7, and the structure filling according to fractal antenna is in each Standard is divided between shape part 3 and between quasi- fractal structure and sleeve, the utility model show there are four coated by dielectric part, Width is L5, L6, L7, L8；Wherein L5 load is medium length between top-loaded 10 and quasi- fractal structure 3, and L6, L7 are loads The medium length between quasi- fractal structure 3, and L8 loads on the medium length between sleeve 7 and quasi- fractal structure 3, L5, L6, The value of L7, L8 need to be adjusted according to microwave ablation target organ tissue permittivity, can be with equal length, can also be with length not Deng generally between 0.5mm~5mm；

Antenna medium loading unit 4 can reduce antenna physical ruler so that antenna has the load of high dielectric constant dielectric It is very little, and during Microwave Coagulation Therapy, guarantee the stability of antenna surrounding medium constant, to improve the stabilization of antenna near-field Distribution, effectively control melts form close to spheroidal therewith.

Quasi- antenna divides shape part 3, and quantity one or more point shape part can be loaded on the inner core 6 of microwave cable 5, can According to different frequency, the parameters such as target ablation tissue dielectric constant adjust parting section quantity；Various lead can be selected on material Electric metal, such as copper, iron, aluminium, gold, silver or its alloy, wherein it is preferred that copper or copper class alloy material are such as schemed using cannula structure 7, by soldering, soldering, the processing methods such as Laser Welding are electrically connected with 5 inner core of microwave cable, 6 phase.

Quasi- antenna point shape part 3 includes three points of shape type parts, and width is respectively L2, L3 and L4, width and fractal date amount Need to be adjusted according to microwave ablation target organ tissue permittivity, L2, L3 and L4, numerical value generally between 0.1mm~1mm, L2, L3 and L4 value can be adjusted separately according to Antenna Impedance Matching, the requirements such as bandwidth；

Quasi- antenna divides shape part 3, so that microwave melt needle is integrated with the feature of fractal antenna: reducing microwave melt needle day The size of line；Increase working band；Using its " bootstrap loading " property, the elements such as additional syntonizing coil, capacitor are not needed Or match circuit makes it reach impedance matching in bandwidth operation；

Sleeve 7 is shielded on 7 top of sleeve with microwave cable 5 in aerial radiation distal portions, using high-temperature insulation medium 2 Layer outer metallic surface phase electrical isolation；And 7 bottom of sleeve is electrically connected with 5 shielded layer of microwave cable, and is inserted in shank, Soldering, the techniques such as ratio-frequency welding can be used；Sleeve ensure that the rigidity of antenna module simultaneously.

High-temperature insulation medium 2, material can use plastic materials, such as PTFE, FEP, PFA, ETFE, etc. high temperature resistants material Material, low microwave absorbability material, preferably PTFE medium.Thickness is between 0.01mm~0.1mm, preferably 0.05mm；For 2.45GHz microwave, length is related with microwave wavelength, can be between 6~26mm；

Length with high-temperature insulation medium 2 is L10, with the front end cable shield 5a between coated by dielectric portion 4 away from From for L11, by adjusting sleeve L10/L11 ratio, sleeve outer diameter and sleeve 7 load antenna length between 10 to top, will It is effectively improved the beamwidth of antenna, increases the extremely sub- equivalent redius of antenna.Improve aerial radiation efficiency in entire tissue ablation process. L10/L11 ratio is between 1/2~1/4.The total length of aerial radiation part L1+L2+L3+L4+L5+L6+L7+L8+L10+L11 Related to radiation microwave wavelength, length is between the λ of 1/4 λ~1/2.

7 distal portions L9 of sleeve is inserted into 1 inner sleeve portion length of syringe needle, using refractory ceramics glue and 1 phase of syringe needle Connection, proximal end socket-connect with ablation needle shank 8, and 304 stainless steels of compound bio compatibility can be selected in shank 8, and 8 surface of shank can It, can be using riveting, soldering, the Joining Technologies such as soldering or glue bonding between sleeve and shank to spray anti-stick coating；Sleeve Guarantee sleeve 7 and 8 being completely embedded property of shank with can choose filling marine glue around shank, it is ensured that coolant liquid does not connect from the socket It is excessive at mouthful.7 material of sleeve can select various conductive metals, such as copper, iron, aluminium, gold, silver or its alloy, wherein it is preferred that copper Or copper class alloy material.

The length of sleeve 7 can be any a part of entire monopole length in principle: from zero (no sleeve) to sleeve Constitute the entire radiant section of antenna.Practical upper bush is usually about 1/3 to 1/2 monopole height, and sleeve can increase bandwidth To more than 1 octave.

Sleeve 7 is playing the extremely sub- equivalent redius of increase antenna, the improvement beamwidth of antenna, is improving outside antenna radiation efficiency；Energy will Heat inside syringe needle 1 is transferred to shank cooling position by sleeve, by cooling channel coolant liquid cooling cover, reduces needle Temperature inside head improves microwave melt needle job stability, the stability of inside bonding glue, safety.

The microwave melt needle further includes shank part and handle portion, and shank partial interior has microwave cable 5 and inside cold But access, wherein the microwave for being used to treat is transferred to antenna module radiation from microwave generator by microwave cable 5；Handle portion, As shown in Figure 10, clinical use needs are met using straight handle.It includes the microwave coaxial being connected with micro-wave therapeutic line Connector 13；And internal cooling channel and external cooling line 17,18 are connected；Coolant temperature monitoring signal connector 15, Coolant liquid thermometric 16, cooling water tank 12 and handle casing composition.

Coolant liquid enters internal cooling channel by external cooling line 17,18, and coolant liquid is injected into sleeve 7 and microwave Cable shield welding position, can effective cooling cover temperature；Coolant liquid thermometric prevents different for monitoring internal coolant temperature Often occur.

Through in vitro tissue it is experimentally confirmed that the utility model antenna module, passes through high-temperature resistant medium syringe needle, top-loaded, Jie Matter load, quasi- fractal structure and tube-in-tube structure；The beamwidth of antenna, impedance, radiance are improved, and is reduced in ablation procedure The variation of ablation form brought by tissue permittivity variation.Obtain comparatively ideal spherical ablation form；Wherein microwave disappears Melt the direct cooling cover of needle energy, reaches the temperature of effectively control ablation needle wall, avoid temperature is excessively high from burning out ablation needle and doctor Treatment accident；The microwave melt needle of the utility model improves the ultrasonic reflection rate under B ultrasound simultaneously, significantly enhances ultrasonic development effect Fruit improves clinician's usage experience.

Embodiment 2:

1 outer surface of syringe needle can be by machining and the techniques such as powder injection-molded, and processing radius on 1 surface of syringe needle is The frequency that 0.01mm~0.1mm depth, semi-circular recesses, depth of groove and ultrasonic probe use, wavelength are related.It can be according to clinic Using percentage regulation.

The groove 19 of one or more is equipped with such as Fig. 2 a and 2b, outside syringe needle 1, notch shape is semi-circular recesses.

Embodiment 3:

1 outer surface of syringe needle can by powder injection molding process, 1 surface of syringe needle process radius be 0.01mm~ 0.1mm depth, triangle groove, for triangle groove for changing ultrasonic reflection direction, each triangle depth of groove can be inconsistent, leads to Adjustment triangular angles size is crossed, ultrasonic reflection direction is changed, reduces scattered ultrasound waves, improves and returns to ultrasonic probe Bobbi example, To improve ultrasonic development effect.

The groove 20 of one or more is equipped with such as Fig. 3 a and 3b, outside syringe needle 1, notch shape is triangle.

Embodiment 4:

1 outer surface of syringe needle can be by laser or powder injection molding process, and processing radius on 1 surface of syringe needle is 0.01mm~0.1mm depth, semicircle concave point；The frequency that concave point depth and ultrasonic probe use, wavelength are related.It can be according to clinic Using adjustment radius.

Such as Fig. 4 a and 4b, more than one shrinkage pool 21 is equipped with outside syringe needle 1, notch shape is semicircle.

Embodiment 5:

1 outer surface of syringe needle can by powder injection molding process, 1 surface of syringe needle process radius be 0.01mm~ 0.1mm depth, rectangular pyramid shrinkage pool, for rectangular pyramid shrinkage pool for changing ultrasonic reflection direction, each triangle depth of groove can be different It causes, by adjusting triangular angles size, changes ultrasonic reflection direction, reduce scattered ultrasound waves, improve and return to ultrasonic probe wave Ratio, to improve ultrasonic development effect.

Such as Fig. 5 a and 5b, more than one shrinkage pool 22 is equipped with outside syringe needle 1, shrinkage pool 22 is tetragonous wimble structure.

Embodiment 6:

Top-loaded is outer in addition to disc load, can be selected 6bL shape, 6cT shape and 6d cross-shaped structure, three kinds of structures and Disc load is the same for changing antenna surface current distribution, shortens the size of antenna, improves the input bandwidth of antenna；L shape, T shape and cross interstitial hole are for penetrating microwave cable inner core；Pass through Laser Welding, the processing technologys such as soldering or soldering, by top Load is electrically connected with microwave cable inner core.Antenna using cylindrical, L shape, T shape or cross-shaped top when being loaded, day Line input impedance will be different, and to guarantee impedance matching, in adjustment day thread, top-loaded mode listed above be selected to reach To impedance matching, and change antenna surface current distribution, shorten antenna size and improve input bandwidth,

Such as Fig. 6 b, top-loaded portion 10 uses L-shaped structure；Such as Fig. 6 c, top-loaded portion 10 uses T-shaped structure；Such as Fig. 6 d, Top-loaded portion 10 uses cross-shaped structure；

Embodiment 7:

Handle 14 is used for operator's handheld component, it includes the microwave coaxial connector being connected with micro-wave therapeutic line 13；And internal cooling channel and external cooling line 17,18 are connected；Coolant temperature monitoring signal connector 15, microwave Ablation treating system monitors coolant temperature, cooling-water temperature transmitter 16, cooling water tank 12 and handle casing by interface 15 Engineering plastics injection molding, such as ABS, the materials such as PVC can be used in composition, handle casing.

Such as Figure 10, using straight handle；

Embodiment 8:

Such as Figure 11, using L shape handle.

The utility model provides a kind of microwave melt needle with antenna module, implement the technical solution method and There are many approach, and the above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and Retouching also should be regarded as the protection scope of the utility model.The available prior art of each component part being not known in the present embodiment adds To realize.

Claims (10)

1. a kind of microwave melt needle with antenna module, which is characterized in that including radiator and the shank being connected with radiator (8), the radiator includes the radiator antenna of syringe needle (1) and syringe needle (1) inside, and radiator antenna includes top loading unit (10) and the coated by dielectric portion (4) and standard point shape portion (3) that are arranged alternately microwave cable (5), are equipped with inside shank (8), microwave Cable (5) includes cable inner core (6), and cable inner core (6) advances through the coated by dielectric portion (4) and standard point shape portion being arranged alternately (3) and top loading unit (10).

2. a kind of microwave melt needle with antenna module according to claim 1, which is characterized in that the microwave cable (5) include cable shield (5a), be socketed with high-temperature insulation medium (2) outside cable shield (5a) front end.

3. a kind of microwave melt needle with antenna module according to claim 2, which is characterized in that cable shield (5a) Front end is two to four times of the length of high-temperature insulation medium (2) to the distance between coated by dielectric portion (4).

4. a kind of microwave melt needle with antenna module according to claim 2 or 3, which is characterized in that high-temperature insulation The outer ring of medium (2) is equipped with sleeve (7), and sleeve (7) front end extends to and is connected to coated by dielectric portion (4), and sleeve (7) rear end connects It connects on the microwave cable (5) after high-temperature insulation medium (2).

5. a kind of microwave melt needle with antenna module according to claim 4, which is characterized in that the shank (8) with Cooling channel (11) are equipped between microwave cable (5), cooling channel (11) extends to sleeve shank (8) front end, cooling channel (11) coolant liquid is equipped in, the heat at radiator antenna is transmitted to coolant liquid, microwave cable (5) rear end by sleeve (7) It is connected to microwave coaxial connector (12), microwave coaxial connector (12) is externally provided with the water tank being connected to cooling channel.

6. a kind of microwave melt needle with antenna module according to claim 1, which is characterized in that the coated by dielectric portion (4) and standard point shape portion (3) is cannula structure.

7. a kind of microwave melt needle with antenna module according to claim 1, which is characterized in that the syringe needle (1) is outside Surface is equipped with the groove of a circle or more, to enhance ultrasonic development effect.

8. a kind of microwave melt needle with antenna module according to claim 1 or claim 7, which is characterized in that the syringe needle (1) Outer surface is equipped with one group or more of concave point, to enhance ultrasonic development effect.

9. a kind of microwave melt needle with antenna module according to claim 1, which is characterized in that the syringe needle (1) is outside Surface is coated with anti-stick coating (9).

10. a kind of microwave melt needle with antenna module according to claim 1, which is characterized in that the coated by dielectric Portion (4) has 2 or more, and standard point shape portion (3) has more than one.