WO2009079873A1 - Canule d'aiguille en alliage spécial et aiguille destinée à des animaux utilisant une telle canule - Google Patents

Canule d'aiguille en alliage spécial et aiguille destinée à des animaux utilisant une telle canule Download PDF

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Publication number
WO2009079873A1
WO2009079873A1 PCT/CN2007/071209 CN2007071209W WO2009079873A1 WO 2009079873 A1 WO2009079873 A1 WO 2009079873A1 CN 2007071209 W CN2007071209 W CN 2007071209W WO 2009079873 A1 WO2009079873 A1 WO 2009079873A1
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Prior art keywords
needle
stainless steel
steel material
veterinary
material further
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PCT/CN2007/071209
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English (en)
French (fr)
Inventor
Qiubao Pan
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Qiubao Pan
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Priority to PCT/CN2007/071208 priority Critical patent/WO2009079872A1/zh
Priority to PCT/CN2007/071209 priority patent/WO2009079873A1/zh
Publication of WO2009079873A1 publication Critical patent/WO2009079873A1/zh

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61DVETERINARY INSTRUMENTS, IMPLEMENTS, TOOLS, OR METHODS
    • A61D7/00Devices or methods for introducing solid, liquid, or gaseous remedies or other materials into or onto the bodies of animals
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/329Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles characterised by features of the needle shaft

Definitions

  • the invention relates to a needle and a needle tube, in particular to a veterinary needle and a needle tube. Background technique
  • U.S. Patent No. 6,599,276, in 2000 proposed the use of ferritic stainless steel (430) and martensitic stainless steel (420) as the part of the steel pipe for the needle, so that it is on the metal detector of the existing meat factory. It is easier to detect broken needles.
  • the wall thickness of the needle tube was thickened and the strength was strengthened.
  • the cost of raw materials increased, and the wounds increased significantly when injected into livestock, which caused more pain to the livestock and may cause part of it. Livestock hurts the injector due to pain.
  • ferritic stainless steels Another problem with ferritic stainless steels is that the splicing performance is poor and the spliced portions are prone to rust.
  • Pass 304 stainless steel has excellent splicing performance, and ferritic stainless steel is used as a needle steel pipe. Because quilting is easy to rust, it may bring hidden dangers.
  • U.S. Patent No. 6,488,668 also proposes a stainless steel needle tube made of a magnetizable metal material in stainless steel for the problem of broken needles, and defines a wide range of stainless steel. However, from the analysis of its composition range, the hardness of the needle tube made of the stainless steel material proposed by the patent is still low and the detectability is not high. Summary of the invention
  • the present invention provides a needle tube and a veterinary needle using the same, which solves the problem that the veterinary needle tube of the prior art is easily bent or broken, and is not easily detected by a metal detector after being broken.
  • the present invention provides a needle tube having a bottom end for contacting a needle holder and a tip for contacting an injection portion, wherein the needle tube is made of a stainless steel material, and the stainless steel material contains more than 20 wt% Cr, the microstructure is ferritin, and the ferritin is greater than 40 wt%.
  • the invention further provides a veterinary needle comprising a needle holder and a needle tube, wherein the needle tube is made of a stainless steel material containing more than 20 wt% of Cr, a microstructure of ferritin, and a ferritin More than 40 wt%.
  • the needle tube and the veterinary needle provided by the invention ensure the detectability because the microstructure of the stainless steel material used is a ferrite plasmid, and the hardness is improved due to the high chromium content, and the Mo can be added by adding Mo. And adjust the toughness, therefore, in use, the needle tube is not easy to bend and break, even if broken into the animal body, it is easy to be detected by the metal detector.
  • a preferred embodiment of the present invention is a schematic view of a veterinary needle according to an embodiment of the present invention.
  • the needle 100 includes a needle tube 10 and a needle holder 20, wherein the needle tube 10 has a The bottom end 12 of the needle hub 20 is joined and a tip end 14 for contacting the injection site.
  • the needle tube 10 is made of stainless steel, but the composition of the stainless steel material can be selected from a plurality of types, and the composition types may include Fe, Si, P, Cr, Al, Mn, Mo, Ti, etc.
  • Stainless steel is divided into ferrite, martensite, austenite, duplex, precipitation hardened stainless steel, etc. according to its microstructure. Later, super stainless steel was developed, including super martensitic stainless steel, super ferritic stainless steel, super austenitic stainless steel, super duplex stainless steel, maraging stainless steel, and the like. So far, after nearly a hundred years of research and development, stainless steel has formed a series of steel grades with more than 300 grades. Therefore, in terms of performance, the increase and decrease in the specific gravity of each component, as well as the change in microstructure, will have a great impact on product performance.
  • the needle tube 10 is made of a stainless steel material containing more than 20 wt% of Cr, a microstructure of ferric plasmid, and a ferrite plasmid of more than 40
  • the Cr content in the stainless steel material is greater than 25 wt%, and 45 wt%, to achieve a balance between hardness, smelting cost, and detectability.
  • the stainless steel material further contains 0.01 to 5.0 wt% of Mo to increase the toughness.
  • the stainless steel material further comprises Mo and N, E. Cr + 3.3 Mo + 22 N > 35 wt%.
  • the sum of C and N contained in the stainless steel material is ⁇ 0.10 wt%.
  • the content of other components can be referred to the basic concept of stainless steel.
  • the stainless steel for the needle tube of the invention may include:
  • Pb is less than 0.01 wt%
  • the rest are iron (Fe) and the microstructure is a ferritin material.
  • the components in the stainless steel material may specifically be:
  • the stainless steel material suitable for the veterinary needle of the present invention contains high chromium in comparison with the stainless steel material used in the field of the conventional veterinary needle.
  • Stainless steel with a high Cr content is conventionally used in industries that are resistant to corrosion due to its excellent corrosion resistance, such as seawater desalination or organic acid industry, or coastal building materials.
  • the inventive stainless steel for manufacturing a veterinary needle needle tube The use of higher chromium in the material not only retains its inherent corrosion resistance, but also achieves the purpose of increasing hardness, while the microstructure is ferritin to ensure detectability. If you adjust the Mo content further, you can also enhance the toughness. From the experimental point of view, it has achieved good technical results.
  • the steel tube must not be too soft and too brittle, otherwise many difficulties will arise during use.
  • the following table shows the comparison of Vickers hardness (after making a needle steel pipe, the Vickers hardness is measured by grinding, 10 pieces of 18G and 16G each)
  • the material proposed in this patent is made of steel pipe and its hardness can be compared with 304.
  • 30-2 is Cr30Mo2 super ferritic stainless steel.
  • 30-2 is similar to the detectability of conventional ferritic stainless steel 430. Significantly higher than the representative of duplex stainless steel 2205.
  • the needle of the material used in the present invention is similar to the brittleness of 304, while the needle produced by the conventional ferritic stainless steel is obviously brittle.
  • the needle of the material used in the present invention is similar to the transverse hardness of 304, whereas the conventional ferritic stainless steel (430) produces a needle having a relatively small transverse hardness.
  • the veterinary needle and the needle tube provided by the invention can be compared with the 304, and can not only replace the traditional needle made by 304, but also has better performance, compared with the splicing performance, strength, toughness, rust prevention performance and crevice corrosion resistance. Needle made in traditional ferritic stainless steel (430).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Zoology (AREA)
  • Hematology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biomedical Technology (AREA)
  • Anesthesiology (AREA)
  • Vascular Medicine (AREA)
  • Wood Science & Technology (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Description

一种特种合金针头管及使用这种针头管的兽用针头
技术领域
本发明涉及一种针头及针头管, 尤其涉及一种兽用针头及针头管。 背景技术
随着人类生活水平的提高, 肉用牲畜饲养厂的牲畜数量越来越大, 这 就需要兽医或养殖人员更加经常的为牲畜进行注射疫苗或治疗。但在为牲 畜打针的时候,由于在牲畜感到疼痛时,经常会出现类似疯狂的剧烈运动, 造成注射针头的钢管部分发生断裂, 断针会挂在牲畜身上, 而由于针头管 部分前端锋利,在牲畜运动过程中,断针会向前运动,直至进入牲畜体内, 这一方面会造成对动物的伤害, 另一方面, 由于滞留在牲畜体内的断针不 易被发现, 当牲畜经过肉联厂屠宰处理并成为食品后, 断针很可能会造成 对人的伤害。
为了发现断针,很多屠宰场或食品检测机构使用金属探测器对屠宰加 工后的牲畜肉块进行探测, 以及时发现滞留在肉块内的断针。 然而, 传统 的兽用针头使用的 304不锈钢制成的针头管不易被金属探测器检测到。
针对这一问题,美国专利号 6,599,276于 2000年提出了用铁素体不锈 钢 (430 ) 和马氏体不锈钢 (420 ) 来做针头的钢管部分, 这样在现有的 肉联厂的金属探测器上, 比较容易检测到断针。
然而, 马氏体材料因为脆性, 多数用来做刀具, 不适合用来做针头的 钢管部分。而铁素体材料的硬度明显低于传统 304不锈钢针,这在注射时, 针头很容易发生弯曲, 消毒后再注射的次数明显减少, 造成成本上升。
后来该专利在实际应用中经过改进,将针管壁厚加厚,强度有所加强, 但原材料成本上升,给牲畜注射时,伤口明显增大,给牲畜带来更多痛苦, 可能会造成部分牲畜因痛苦而伤害注射者。
铁素体不锈钢的另一问题是悍接性能不佳, 悍接部分容易生锈。而传 统 304不锈钢的悍接性能优良, 改用铁素体不锈钢做针头钢管, 因为悍缝 容易生锈, 可能会带来隐患。
美国专利号 6,488,668,也是针对断针问题提出用不锈钢中可磁化的金 属材料做成不锈钢针头管, 并定义了很广的不锈钢范围。 然而, 从其组分 范围分析, 由该专利提出的不锈钢材料制成的针头管的硬度仍然偏低, 可 检测性也不高。 发明内容
本发明提供一种针头管及使用这种针头管的兽用针头, 以解决现有技 术中的兽用针头管容易弯曲或折断,且折断后不易被金属探测器检测到的 问题。
为解决上述技术问题, 本发明提供一种针头管, 具有用于与针头座相 接的底端和用于接触注射部位的尖端, 其中该针头管由不锈钢材料制成, 该不锈钢材料中含有大于 20 wt%的 Cr, 微结构为铁素质粒, 且铁素质粒 大于 40 wt%。
本发明进而提供一种兽用针头, 包括针头座和针头管, 其中该针头管 由不锈钢材料制成, 该不锈钢材料中含有大于 20 wt%的 Cr, 微结构为铁 素质粒, 且铁素质粒大于 40 wt%。
本发明提供的针头管及兽用针头, 由于所采用的不锈钢材料的微结构 为铁素质粒, 因此保证了可检测性,而由于铬含量较高, 由此提高了硬度, 更可以通过加入 Mo, 而调节韧性, 因此, 在使用中, 针头管不易弯曲折 断, 即使折断进入牲畜体内, 也很容易被金属探测器检测到。 附图概述
图 1为根据本发明实施例所示的兽用针头示意图。 本发明的最佳实施方式 如图 1所示, 为根据本发明实施例所示的兽用针头示意图, 所述针头 100包括针头管 10和针头座 20,其中所述针头管 10具有用于与针头座 20 相接的底端 12和用于接触注射部位的尖端 14。
一般来说, 针头管 10是由不锈钢制成, 但不锈钢材料的组分可以由 多种选择, 组分种类可以包括 Fe、 Si、 P、 Cr、 Al、 Mn、 Mo、 Ti等十几 种, 而不锈钢根据其微结构的不同又分为铁素体、马氏体、奥氏体、双相、 沉淀硬化不锈钢等。 后来又发展出超级不锈钢, 包括超级马氏体不锈钢、 超级铁素体不锈钢、 超级奥氏体不锈钢、 超级双相不锈钢、 马氏体时效不 锈钢等等。 至今, 不锈钢经过近百年的研制和开发, 已形成一个有 300多 个牌号的系列化的钢种。 因此, 从性能上说, 每种组分的比重增减, 以及 微结构的变化, 都会对产品性能有很大的影响。
根据本发明的一个实施例, 该针头管 10由不锈钢材料制成, 该不锈 钢材料中含有大于 20 wt%的 Cr, 微结构为铁素质粒, 且铁素质粒大于 40
Wt% o
优选的, 所述不锈钢材料中的 Cr含量大于 25 wt%, 且 45 wt%, 以 在硬度、 冶炼成本以及可检测性之间获得平衡。
优选的, 所述不锈钢材料中进一歩包含 0.01- 5.0 wt%的 Mo, 以增加 韧性。
优选的,所述不锈钢材料中进一歩包含 Mo和 N, E. Cr + 3.3 Mo + 22 N > 35 wt%。
优选的, 所述不锈钢材料中含有的 C和 N的总和 ≤0.10 wt%。
其他组分的含量, 可以参照不锈钢的基本概念。
具体来说, 制成本发明的针头管的不锈钢, 可以包括:
Si 0.01-3.0 wt% P 小于 0.03 wt%
Cr 20-45 wt%
Al 0.003-7.0 wt%
Mn 0.01- 1.0 wt%
S 0.001- 0.03 wt%
Mo 0.1- 5.0 wt%
Ti 0.01- 1.0 wt%
C 0.003- 0.08 wt%
Ni 0.01- 5.0 wt%
Cu 0.01- 0.5 wt%
Pb 小于 0.01 wt%
Bi 0.02- 0.5 wt%
Nb 0.1- 1.0 wt%
Zr 0.02- 1.0 wt%
V 0.05- 1.0 wt%
其余为铁 (Fe) , 微结构为铁素质粒的材料。
更加优选的, 所述不锈钢材料中的组分可以具体是:
Cr= :30, Mo: =2;
Cr= :25, Mo: =4, Ni= :4
Cr= :25, Mo: =3, Ni= :3
Cr= :29, Mo: =4, Ti= 1:
Cr= :29, Mo: =4, Ni= :2
Cr= :28, Mo: =2, Ni= :4
相对于现有兽用针领域使用的不锈钢材料而言,适用于本发明的兽用 针的不锈钢材料中含有较高的铬。 Cr含量较高的不锈钢, 由于其优良的耐 腐蚀性, 传统上一般是应用于抗腐蚀性的工业中, 例如海水淡化或有机酸 工业, 或沿海建筑材料等。 本发明创造性的在制造兽用针针头管的不锈钢 材料中使用了较高的铬, 不仅保有其固有的耐腐蚀性, 而且达到了提高硬 度的目的, 而微结构为铁素质粒则保证了可检测性。 如果进一歩调节 Mo 的含量, 还可以增强韧性。 从实验来看, 取得了很好的技术效果。
下面以牌号 30— 2 (Cr30Mo2)作为代表, 具体通过以下实验数据来 进行性能分析。
1、 硬度对比:
虽然本发明在应用上强调可检测性,但作为针头,钢管必须不能太软, 太脆, 否则使用过程中会产生很多困难。
下表为维氏硬度对比(做成针头钢管后,磨平测维氏硬度, 18G和 16G 各 10根)
Figure imgf000007_0001
我们可以看出, 本专利提出的材料做成钢管, 硬度可与 304相比。 其 中 30— 2 为 Cr30Mo2 超级铁素体不锈钢。
2、 可探测性
目前的探测器基本上是按铁素质粒的磁导率的多少来进行探测。
材料的相对可探测性对比如下:
相对可探测性对比 (16G X 1", 横向通过, 以铁的读数为 100, 根针平均)
Figure imgf000007_0002
从以上数据可以看出,30-2与传统铁素体不锈钢 430的可探测性相似。 明显高于双相不锈钢的代表 2205。
3、 脆性
因为兽用针头经常被多次使用, 所以在实际应用中, 经常用针头钢管 在断开或出现裂缝前能够横向摆动的次数决定针的好坏
横向摆动的次数对比 (18G, 摆幅为 25°, 10根针平均)
Figure imgf000008_0001
从数据中我们可以看出,本发明所用的材料的针头与 304的脆性相近, 而传统的铁素体不锈钢所生产的针头明显偏脆。
4、 横向硬度
我们用横向力矩 (力 · 距离) 来描述钢管的横向强度。 这个参数重要 是因为针尖在受到横向阻力时容易产生针尖弯曲, 造成针头不能再使用。
Figure imgf000008_0002
从数据中我们可以看出,本发明所用的材料的针头与 304的横向硬度 相近, 而传统的铁素体不锈钢 (430) 所生产的针头横向硬度明显偏小。
如果横向硬度偏低,在使用过程中出现的弯针尖的百分比例能很明显 的偏多。 工业实用性
很明显, 本发明提供的兽用针头及针头管, 其悍接性能, 强度, 韧性, 防锈性能, 耐缝隙腐蚀都可以与 304相比, 不仅能够替代 304所做的传统 针头, 性能更优于传统铁素体不锈钢 (430) 所做的针头。

Claims

权 利 要 求 书
1、 一种针头管, 具有用于与针头座相接的底端和用于接触注射部位 的尖端, 其中该针头管由不锈钢材料制成, 该不锈钢材料中含有大于 20 wt%的 Cr, 微结构为铁素质粒, 且铁素质粒大于 40wt%。
2、 如权利要求 1所述的针头管, 其中所述不锈钢材料中的 Cr含量大 于 25wt%, 小于等于 45wt%。
3、 如权利要求 1所述的针头管, 其中所述不锈钢材料中进一歩包含 0.01-5.0wt% Mo。
4、 如权利要求 1所述的针头管, 其中所述不锈钢材料中进一歩包含
Mo禾 ΠΝ, Cr + 3.3Mo + 22N>35wt%。
5、 如权利要求 1所述的针头管, 其中所述不锈钢材料中含有的 C和 N的总和 ≤0.10wt%。
6、 如权利要求 1所述的针头管, 其中所述不锈钢材料中进一歩包含 Mo, 且 Cr = 30wt%; Mo = 2wt%。
7、 如权利要求 1所述的针头管, 其中所述不锈钢材料中进一歩包含 Mo, Ti和 Nb, 且 Cr = 29wt%, Mo = 4 wt%, Ti = 1 wt%, Nb = lwt%。
8、 如权利要求 1所述的针头管, 其中所述不锈钢材料中进一歩包含 Mo禾口 Ni, 且 Cr = 29wt%, Mo = 4 wt%, Ni = 2wt%。
9、 如权利要求 1所述的针头管, 其中所述不锈钢材料中进一歩包含
Mo禾口 Ni, 且 Cr = 28 wt%, Mo = 2 wt%, Ni = 4wt%。
10、 如权利要求 1所述的针头管, 其中所述不锈钢材料中进一歩包含 Mo禾口 Ni, 且 Cr = 25wt%, Mo = 4 wt%, Ni = 4wt%。
11、 如权利要求 1所述的针头管, 其中所述不锈钢材料中进一歩包含 Mo和 Ni, 且 Cr = 25wt%, Mo = 3 wt%, Ni = 3wt%。
12、 一种兽用针头, 包括针头座和针头管, 针头管具有与针头座相接 的底端和用于接触注射部位的尖端, 其中该针头管由不锈钢材料制成, 该 不锈钢材料中含有大于 20wt%的 Cr, 微结构为铁素质粒, 且铁素质粒大 于 40 wt%。
13、 如权利要求 12所述的兽用针头, 其中所述不锈钢材料中的 Cr含 量大于 25 wt%, 小于等于 45 wt%。
14、 如权利要求 12所述的兽用针头, 其中所述不锈钢材料中进一歩 包含 0.01-5.0wt°/c^ Mo。
15、 如权利要求 12所述的兽用针头, 其中所述不锈钢材料中进一歩 包含 Mo和 N, Cr + 3.3Mo + 22N>35wt%。
16、如权利要求 12所述的兽用针头,其中所述不锈钢材料中含有的 C 和 N的总和 ≤0.10wt%。
17、 如权利要求 12所述的兽用针头, 其中所述不锈钢材料中进一歩 包含 Mo, 且 Cr = 30wt%; Mo = 2wt%。
18、 如权利要求 12所述的兽用针头, 其中所述不锈钢材料中进一歩 包含 Mo, Ti禾口 Nb,且 Cr = 29 wt%, Mo = 4 wt%, Ti = 1 wt%, Nb = 1 wt%。
19、 如权利要求 12所述的兽用针头, 其中所述不锈钢材料中进一歩 包含 Mo和 Ni, 且 Cr = 29wt%, Mo = 4 wt%, Ni = 2wt%。
20、 如权利要求 12所述的兽用针头, 其中所述不锈钢材料中进一歩 包含 Mo和 Ni, 且 Cr = 28 wt%, Mo = 2 wt%, Ni = 4wt%。
21、 如权利要求 12所述的兽用针头, 其中所述不锈钢材料中进一歩 包含 Mo和 Ni, 且 Cr = 25wt%, Mo = 4 wt%, Ni = 4wt%。
22、 如权利要求 12所述的兽用针头, 其中所述不锈钢材料中进一歩 包含 Mo和 Ni, 且 Cr = 25wt%, Mo = 3 wt%, Ni = 3wt%。
PCT/CN2007/071209 2007-12-10 2007-12-10 Canule d'aiguille en alliage spécial et aiguille destinée à des animaux utilisant une telle canule WO2009079873A1 (fr)

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