CN116549100A - Ablation needle head and preparation method thereof - Google Patents
Ablation needle head and preparation method thereof Download PDFInfo
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- CN116549100A CN116549100A CN202310527422.3A CN202310527422A CN116549100A CN 116549100 A CN116549100 A CN 116549100A CN 202310527422 A CN202310527422 A CN 202310527422A CN 116549100 A CN116549100 A CN 116549100A
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- 238000002679 ablation Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 238000000576 coating method Methods 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims description 58
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 238000000151 deposition Methods 0.000 claims description 14
- 229910002804 graphite Inorganic materials 0.000 claims description 14
- 239000010439 graphite Substances 0.000 claims description 14
- 238000005238 degreasing Methods 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 229910052737 gold Inorganic materials 0.000 claims description 7
- 239000010931 gold Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 230000008021 deposition Effects 0.000 claims description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052727 yttrium Inorganic materials 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000012300 argon atmosphere Substances 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000005551 mechanical alloying Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000012188 paraffin wax Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 11
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 210000004872 soft tissue Anatomy 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 8
- 239000000956 alloy Substances 0.000 abstract description 7
- 238000001746 injection moulding Methods 0.000 abstract description 6
- 238000012986 modification Methods 0.000 abstract description 6
- 230000004048 modification Effects 0.000 abstract description 6
- 229910001080 W alloy Inorganic materials 0.000 abstract description 5
- 208000031737 Tissue Adhesions Diseases 0.000 abstract description 3
- 230000002209 hydrophobic effect Effects 0.000 abstract description 3
- 230000003685 thermal hair damage Effects 0.000 abstract description 3
- 210000001519 tissue Anatomy 0.000 description 6
- 241000931705 Cicada Species 0.000 description 5
- 206010052428 Wound Diseases 0.000 description 5
- 208000027418 Wounds and injury Diseases 0.000 description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 5
- 229910052721 tungsten Inorganic materials 0.000 description 5
- 239000010937 tungsten Substances 0.000 description 5
- 238000010891 electric arc Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000001356 surgical procedure Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 210000004369 blood Anatomy 0.000 description 3
- 239000008280 blood Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000002324 minimally invasive surgery Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000003075 superhydrophobic effect Effects 0.000 description 2
- 208000032544 Cicatrix Diseases 0.000 description 1
- 229910003271 Ni-Fe Inorganic materials 0.000 description 1
- 208000004550 Postoperative Pain Diseases 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000037387 scars Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00059—Material properties
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00107—Coatings on the energy applicator
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00107—Coatings on the energy applicator
- A61B2018/00148—Coatings on the energy applicator with metal
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00577—Ablation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B2018/1405—Electrodes having a specific shape
- A61B2018/1425—Needle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
- B22F2003/242—Coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Surgery (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Otolaryngology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Plasma & Fusion (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention provides an ablation needle and a preparation method thereof, which adopt a novel tungsten alloy material to improve the hardness of the needle, obtain a hydrophobic structure and a self-lubricating high heat conduction coating by a metal injection molding technology and a cathode arc technology, combine modification and reshaping of the needle, effectively prevent soft tissue adhesion, reduce the thermal damage of adjacent normal soft tissues, and have simple process, high production efficiency and suitability for mass production, thus being very suitable for being applied to the ablation needle.
Description
Technical Field
The invention relates to a needle head and a preparation method thereof, in particular to an ablation needle head and a preparation method thereof, and belongs to the technical field of electrosurgical instrument processing.
Background
The traditional operation has the characteristics of operation of the surgical knife, causes larger wound to the patient during treatment, and has the defects of large wound, more bleeding, long operation time, slow recovery and the like. Therefore, the use of minimally invasive surgical instruments has evolved into "minimally invasive surgery". The minimally invasive surgery only causes tiny wounds to patients in the treatment process of the surgery and only leaves tiny scars after the surgery, and compared with the traditional surgery, the minimally invasive surgery has the advantages of small wounds, less bleeding, short surgery time, light postoperative pain, quick recovery and the like.
High frequency ablation needles are a minimally invasive surgical instrument that is currently in wide use, and are used in place of conventional mechanical scalpels for electrosurgical instruments that cut and coagulate tissue. It is composed of a host machine, a handle, a needle head, a negative plate and a foot switch. The working principle of the electric arc needle is that the needle head generates heat on the skin surface by utilizing the electric current thermal effect and the electric arc tip discharge principle, so that tissue cells are rapidly dehydrated and ruptured, thereby cutting human tissues, and simultaneously, the wound can be rapidly stopped by the high temperature generated by the electric arc tip. At present, the needle head material is mainly SUS304 stainless steel, has good corrosion resistance but low hardness, the diameter of the needle point part is 0.01 mm-0.5 mm, and the needle head has high processing difficulty and high cost. Meanwhile, in the operation process, the needle head is easy to cause blood and soft tissue to dehydrate and scab and even carbonize due to overhigh temperature, and is adhered to and coated with the needle head, so that the current density is reduced, the energy transmission is hindered, and the operation cutting efficiency and the operation blood stopping effect are further affected.
Aiming at the problems of needle materials and preparation, patent document 1 (publication No. CN 109352274A) discloses a flexible bending minimally invasive tungsten needle electrode surgical knife and a production method thereof, and the knife head is manufactured by adopting methods such as blank firing, heat treatment, mechanical processing, laser polishing, laser welding, chemical polishing and the like, but the preparation method is too complex and cannot be produced in a large scale. Aiming at the problem of adhesion of the needle to the tissue, the adhesion phenomenon is improved by a method which mostly relies on a surface coating. Patent document 2 (publication No. CN105999427 a) discloses an anti-adhesion electrotome electrode, in which a metallic tungsten or tungsten alloy coating is formed on the surface of the working portion of the electrode. However, the coating in the above patent documents is poor in reliability and easy to peel, and the anti-sticking capability of the coating is limited only; the micro-nano structure on the surface of the instrument has limited anti-sticking capability, and is easy to damage and fail due to insufficient strength. .
Disclosure of Invention
The invention aims to solve the defects in the prior art, provides an ablation needle and a preparation method thereof, adopts a novel tungsten alloy material, improves the hardness of the needle, obtains a hydrophobic structure and a self-lubricating high-heat-conductivity coating through a metal injection molding technology and a cathode arc technology, combines modification and reshaping of the needle, effectively prevents soft tissue adhesion, reduces adjacent normal soft tissue thermal damage, has simple process and high production efficiency, is suitable for mass production, and overcomes the defects of the process.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention relates to an ablation needle head, which is characterized by comprising a base material and a coating, wherein the shape of a bus of the base material is cylindrical, the length L= (5-8) of the base material is D, D is the diameter of the base material, and D is 0.2-0.5 mm;
the surface of the base material is uniformly distributed with a cylindrical array structure, in the cylindrical array, the diameter of the cylinders is 10-20 um, the distance between the cylinders along the diameter direction of the base material is 20-40 um, and the distance between the cylinders along the length direction of the base material is 20-30 um;
the material of the base material is xW-yNi-zFe-aM1-bM2, M1 is one of Co and Mn, M2 is one of La, ce and Y, x is 90-97wt%, y+z is 2-9wt%, Y/z is 7:3 or 6:4, a is 0.1-0.7wt%, and b is 0.2-0.8wt%;
the thickness of the coating is 2-4 um;
the coating is made of graphite and M, wherein M is one of copper and gold, and the thickness of the graphite layer accounts for 50% -80% of the total thickness of the coating.
The invention discloses a preparation method of an ablation needle head, which is characterized by comprising the following steps of:
s1: mixing: the method comprises the following steps of (1) mixing base material powder and a binder according to a mass ratio of 85% -92%: 8% -15% of the materials are mixed for 3-6 hours at the temperature of 150-180 ℃ to obtain a feed;
s2: shaping: the forming is injection forming, the injection temperature of the feed is 140-170 ℃, and the injection pressure is 60-140 MPa, so that a green body is obtained;
s3: degreasing: heating the green body to 800-1000 ℃ at a heating rate of 5-10 ℃/min under the protection of argon atmosphere, preserving heat for 1-4 hours, and cooling to room temperature along with a furnace to obtain a degreasing blank;
s4: sintering: the vacuum degree of the degreased blank is less than or equal to 10 -2 Heating to 1400-1600 ℃ at a heating rate of 5-10 ℃/min in a vacuum environment of Pa, preserving heat for 1-4 h, and cooling to room temperature along with a furnace to obtain a sintered blank;
s5: pretreatment: polishing the sintered blank, sequentially ultrasonically cleaning the sintered blank with acetone and alcohol, and finally drying the sintered blank for later use to obtain a base material;
s6: and (3) deposition: and depositing a coating on the surface of the substrate by adopting a cathode arc mode to obtain a finished needle product.
As a preferable scheme, the preparation method of the ablation needle is characterized in that the base material powder is prepared by mechanical alloying, and the average particle size of the base material powder is 10-20 um.
As a preferable scheme, the preparation method of the ablation needle head is characterized in that the adhesive is one of polyvinyl alcohol and paraffin.
As a preferable scheme, the preparation method of the ablation needle head is characterized in that in the cathodic arc process, the negative bias voltage is-200 to-50V, and the arc current is 50-100A.
The invention relates to an ablation needle head and a preparation method thereof, which are characterized in that the hardness of the needle head is more than or equal to 40HRC, the water drop angle is more than or equal to 155 degrees, and the heat conductivity coefficient is more than or equal to 60W/(m.K).
Principle and advantages
In order to improve the hardness of the needle head material and reduce the production cost, the invention selects a novel tungsten alloy as a base material, and adds trace Co or Mn metal elements and La, ce or Y rare earth elements based on W-Ni-Fe. The Co or Mn is acted to gather at the interface of the tungsten particles and the binding phase, so that the wettability of the tungsten particles and the binding phase is improved, the interface bonding strength is improved, the tungsten particles become smoother, the coordinated deformation is facilitated to be generated under the external stress, and the strength and the hardness of the alloy material are greatly improved. La, ce or Y rare earth elements can refine grains, and further improve the performance of the material. The base material is prepared by adopting a metal injection molding technology (MIM), the metal injection molding is a near net molding method, and particularly has the advantages which are difficult to compare with the traditional technology in preparing thin-wall and complex structural parts, and the metal injection molding method is used for injecting a high polymer binder and metal powder into a mold to obtain a blank with a specific shape, and then degreasing and sintering are carried out, so that parts with certain density, dimensional accuracy and complex shape are prepared. Has the characteristics of simple process, high production efficiency, low cost, easy mass production and the like.
In order to improve the hydrophobicity of the needle head and achieve the purposes of anti-adhesion and quick heat dissipation, the invention starts from two aspects of modification and reshaping. In the modification aspect, a layer of graphite with self-lubrication and a high heat conduction Au or Cu coating is deposited on the surface of a substrate, deposition is realized by a cathodic arc technology, a plated material is used as a cathodic target in cathodic arc, arc discharge is generated under a certain vacuum degree, plasma is generated on the surface of the cathodic target, and deposition coating is performed by utilizing the plasma. High quality, high performance coatings can be prepared compared to other PVD techniques. In addition, the coating preparation technique has other advantages: (1) high deposition rate and good film uniformity for metals, alloys and compounds; (2) can be deposited at a low substrate temperature to prevent deformation or thermal damage of the substrate; (3) keeping the alloy composition unchanged; (4) easy deposition on workpieces with complex surfaces; (5) the production efficiency is high, and the components of the coating are easy to control; (6) the ionization rate is high, and the binding force between the coating and the matrix is good.
In the aspect of reshaping, the invention designs a micron-sized cylindrical array structure by imitating the microstructure of the surfaces of wings of cicada. The micro-structure can stably adsorb a layer of air film, effectively prevent water drops on the surface from being infiltrated, so that the surface of the air film has super-hydrophobic performance, the self-cleaning function of the surface of the air film is ensured (namely, the air film cannot be adhered by rainwater, dew and dust in the air), and the friction resistance between the air film and the cicada wing in the flying process is effectively reduced, thereby ensuring the stress balance of the cicada wing, and ensuring the good flying capability of the cicada wing. Therefore, the water drop angle of the needle head can reach more than 155 degrees, the heat conductivity coefficient can reach more than 60W/(m.K), the heat dissipation device is of a super-hydrophobic structure, and the anti-adhesion purpose can be well achieved.
Compared with the prior art, the invention provides an ablation needle head and a preparation method thereof, and the ablation needle head has the following advantages:
the production efficiency is high, the MIM technology improves the production efficiency by more than 2 times, and mass production is easy to realize;
the hardness of the base material is high, and the addition of trace Co and rare earth elements improves the hardness of the alloy;
the anti-adhesion is good, and the MIM technology is adopted to process the micron-sized cylindrical array imitating the cicada wing structure, so that the hierarchical microstructure can stably adsorb a layer of air film in the cutting process, effectively prevent the infiltration of blood and tissues on the surface, reduce the direct contact area of a needle head and soft tissues, and effectively reduce the sticking crusting condition of the soft tissues on the surface of the needle head. Meanwhile, a self-lubricating high-heat-conductivity coating is obtained on the surface of the needle through a cathode arc, so that the heat dissipation performance of the needle is improved, and the burn of the needle to tissues is effectively reduced.
In summary, the invention provides an ablation needle and a preparation method thereof, which adopts a novel tungsten alloy material to improve the hardness of the needle, obtains a hydrophobic structure and a self-lubricating high-heat-conductivity coating through a metal injection molding technology and a cathodic arc technology, combines modification and reshaping of the needle, effectively prevents soft tissue adhesion, reduces heat damage of adjacent normal soft tissues, has simple process and high production efficiency, is suitable for mass production, and is very suitable for application to the ablation needle.
Drawings
FIG. 1 is a schematic cross-sectional view of a diameter-wise, 1-coat, 2-substrate of an ablation needle of the invention.
Fig. 2 is a schematic cross-sectional view of an ablation needle of the invention along the length direction, 1-coat, 2-substrate.
Description of the embodiments
The process according to the invention is further described below in connection with three examples.
Examples
An ablation needle and a preparation method thereof are provided, and the process is as follows:
s0: structure & composition design. The ablation needle comprises a substrate and a coating, wherein the substrate is 93W-4.2Ni-1.8Fe-0.5Co-0.5Y (wt.%), the coating is graphite and gold, the thickness of the coating is 4um, and the thickness of the graphite is 3.2um;
the length of the base material is 2.4mm, the diameter of the base material is 0.3mm, the surface of the base material is provided with a uniformly distributed cylindrical array, the diameter of the cylinders is 15um, the distance between the cylinders along the diameter direction of the base material is 30um, and the distance between the cylinders along the length direction of the base material is 25um;
s1: and (5) mixing. The base material powder with the average granularity of 10um prepared by mechanical alloying and paraffin wax are mixed according to the mass ratio of 92%:8% is mixed for 4 hours at 150 ℃ to obtain a feed;
s2: and (5) forming. The forming is injection forming, the injection temperature of the feed is 150 ℃, and the injection pressure is 90MPa to obtain a green body;
s3: degreasing. Heating the green body to 850 ℃ at a heating rate of 5 ℃/min under the protection of argon atmosphere, preserving heat for 2 hours, and cooling to room temperature along with a furnace to obtain a degreasing blank;
s4: sintering. The vacuum degree of the degreased blank is less than or equal to 10 -2 Heating to 1500 ℃ at a heating rate of 5 ℃/min in a vacuum environment of Pa, preserving heat for 2 hours, and cooling to room temperature along with a furnace to obtain a sintered blank;
s5: and (5) pretreatment. Polishing the sintered blank, sequentially ultrasonically cleaning the sintered blank with acetone and alcohol, and finally drying the sintered blank for later use to obtain a base material;
s6: and (5) depositing. And adopting a cathodic arc process, wherein the negative bias voltage is-150V, the arc flow is 80A, and depositing a coating on the surface of the substrate by utilizing graphite and a gold target to obtain a needle finished product. The hardness of the needle was 42HRC, the drop angle was 160℃and the thermal conductivity was 72W/(m.K).
Examples
An ablation needle and a preparation method thereof are provided, and the process is as follows:
s0: structure & composition design. The ablation needle comprises a base material and a coating, wherein the base material is 95W-2.8Ni-1.2Fe-0.4Co-0.6Ce (wt.%), the coating is graphite and gold, the thickness of the coating is 4um, and the thickness of the graphite is 3um;
the length of the base material is 2.8mm, the diameter of the base material is 0.4mm, the surface of the base material is provided with a uniformly distributed cylindrical array, the diameter of the cylinders is 15um, the distance between the cylinders along the diameter direction of the base material is 30um, and the distance between the cylinders along the length direction of the base material is 25um;
s1: and (5) mixing. The substrate powder with the average granularity of 12um prepared by mechanical alloying and polyvinyl alcohol are mixed according to the mass ratio of 92%:8% is mixed for 5 hours at 160 ℃ to obtain a feed;
s2: and (5) forming. The forming is injection forming, the injection temperature of the feed is 160 ℃, and the injection pressure is 80MPa to obtain a green body;
s3: degreasing. Heating the green body to 900 ℃ at a heating rate of 5 ℃/min under the protection of argon atmosphere, preserving heat for 2 hours, and cooling to room temperature along with a furnace to obtain a degreasing blank;
s4: sintering. The vacuum degree of the degreased blank is less than or equal to 10 -2 Heating to 1480 ℃ at a heating rate of 5 ℃/min in a vacuum environment of Pa, preserving heat for 3 hours, and cooling to room temperature along with a furnace to obtain a sintered blank;
s5: and (5) pretreatment. Polishing the sintered blank, sequentially ultrasonically cleaning the sintered blank with acetone and alcohol, and finally drying the sintered blank for later use to obtain a base material;
s6: and (5) depositing. And adopting a cathodic arc process, wherein the negative bias voltage is-155V, the arc flow is 70A, and depositing a coating on the surface of the substrate by utilizing graphite and a gold target to obtain a needle finished product. The hardness of the needle is 40HRC, the water drop angle is 156 degrees, and the heat conductivity coefficient is 70W/(m.K).
Examples
An ablation needle and a preparation method thereof are provided, and the process is as follows:
s0: structure & composition design. The ablation needle comprises a substrate and a coating, wherein the substrate is 97W-1.2Ni-0.8Fe-0.4Mn-0.6La (wt.%), the coating is graphite and copper, the thickness of the coating is 3.5um, and the thickness of the graphite is 2um;
the length of the base material is 2.4mm, the diameter of the base material is 0.4mm, the surface of the base material is provided with a uniformly distributed cylindrical array, the diameter of the cylinders is 15um, the distance between the cylinders along the diameter direction of the base material is 30um, and the distance between the cylinders along the length direction of the base material is 25um;
s1: and (5) mixing. The base material powder with the average granularity of 15um prepared by mechanical alloying and paraffin wax are mixed according to the mass ratio of 92%:8% is mixed for 4 hours at 150 ℃ to obtain a feed;
s2: and (5) forming. The forming is injection forming, the injection temperature of the feed is 150 ℃, and the injection pressure is 90MPa to obtain a green body;
s3: degreasing. Heating the green body to 850 ℃ at a heating rate of 5 ℃/min under the protection of argon atmosphere, preserving heat for 2 hours, and cooling to room temperature along with a furnace to obtain a degreasing blank;
s4: sintering. The vacuum degree of the degreased blank is less than or equal to 10 -2 Heating to 1550 ℃ at a heating rate of 5 ℃/min in a vacuum environment of Pa, preserving heat for 1h, and cooling to room temperature along with a furnace to obtain a sintered blank;
s5: and (5) pretreatment. Polishing the sintered blank, sequentially ultrasonically cleaning the sintered blank with acetone and alcohol, and finally drying the sintered blank for later use to obtain a base material;
s6: and (5) depositing. And adopting a cathodic arc process, wherein the negative bias voltage is 160V, the arc flow is 70A, and depositing a coating on the surface of the substrate by utilizing graphite and a copper target to obtain a needle finished product. The hardness of the needle was 41HRC, the water drop angle was 158℃and the thermal conductivity was 68W/(m.K).
The above examples are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention, and other equivalent changes, modifications, substitutions and combinations of parts or elements according to the principles and teachings of the invention are intended to be included within the scope of the invention.
Claims (6)
1. The ablation needle is characterized by comprising a base material and a coating, wherein the shape of a bus of the base material is cylindrical, the length L= (5-8) D of the base material is the diameter of the base material, and D is 0.2-0.5 mm;
the surface of the base material is uniformly distributed with a cylindrical array structure, in the cylindrical array, the diameter of the cylinders is 10-20 um, the distance between the cylinders along the diameter direction of the base material is 20-40 um, and the distance between the cylinders along the length direction of the base material is 20-30 um;
the material of the base material is xW-yNi-zFe-aM1-bM2, M1 is one of Co and Mn, M2 is one of La, ce and Y, x is 90-97wt%, y+z is 2-9wt%, Y/z is 7:3 or 6:4, a is 0.1-0.7wt%, and b is 0.2-0.8wt%;
the thickness of the coating is 2-4 um;
the coating is made of graphite and M, wherein M is one of copper and gold, and the thickness of the graphite layer accounts for 50% -80% of the total thickness of the coating.
2. A method of preparing an ablation needle in accordance with claim 1, comprising the steps of:
s1: mixing: the method comprises the following steps of (1) mixing base material powder and a binder according to a mass ratio of 85% -92%: 8% -15% of the materials are mixed for 3-6 hours at the temperature of 150-180 ℃ to obtain a feed;
s2: shaping: the forming is injection forming, the injection temperature of the feed is 140-170 ℃, and the injection pressure is 60-140 MPa, so that a green body is obtained;
s3: degreasing: heating the green body to 800-1000 ℃ at a heating rate of 5-10 ℃/min under the protection of argon atmosphere, preserving heat for 1-4 hours, and cooling to room temperature along with a furnace to obtain a degreasing blank;
s4: sintering: the vacuum degree of the degreased blank is less than or equal to 10 -2 Heating to 1400-1600 ℃ at a heating rate of 5-10 ℃/min in a vacuum environment of Pa, preserving heat for 1-4 h, and cooling to room temperature along with a furnace to obtain a sintered blank;
s5: pretreatment: polishing the sintered blank, sequentially ultrasonically cleaning the sintered blank with acetone and alcohol, and finally drying the sintered blank for later use to obtain a base material;
s6: and (3) deposition: and depositing a coating on the surface of the substrate by adopting a cathode arc mode to obtain a finished needle product.
3. The method for preparing an ablation needle according to claim 2, wherein the base material powder is prepared by mechanical alloying, and the average particle size of the base material powder is 10-20 um.
4. The method of claim 2, wherein the binder is one of polyvinyl alcohol and paraffin wax.
5. The method for preparing the ablation needle head according to claim 2, wherein in the cathodic arc process, the negative bias voltage is-200 to-50V, and the arc current is 50-100A.
6. An ablation needle and a method for preparing the same according to any one of claims 1-5, wherein the hardness of the needle is not less than 40HRC, the water drop angle is not less than 155 °, and the thermal conductivity is not less than 60W/(m.k).
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