JPS6327705Y2 - - Google Patents

Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案は吸引生検針に関し、特に、シリンジ内
に発生した陰圧を二重針の先端へ伝達して患部組
成を吸引採取する吸引生検針に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an aspiration biopsy needle, and in particular, an aspiration biopsy needle that transfers the negative pressure generated in the syringe to the tip of the double needle to aspirate and collect the composition of the affected area. Regarding.

〔従来の技術〕[Conventional technology]

第２図は従来の吸引生検針を示し、内針１と外
針２より成る二重針の構成を有し、先端に刃先１
ａ，２ａを有する。 Figure 2 shows a conventional aspiration biopsy needle, which has a double needle configuration consisting of an inner needle 1 and an outer needle 2, with a cutting edge at the tip.
It has a and 2a.

以上の構成において、刃先１ａ，２ａを患部に
穿刺して内針１を約10〜20mm引くと外針２の先端
に吸引力が発生し、患部組織を吸引して採取する
ことができる。 In the above configuration, when the cutting edges 1a and 2a are inserted into the affected area and the inner needle 1 is pulled back by approximately 10 to 20 mm, a suction force is generated at the tip of the outer needle 2, and the tissue of the affected area can be suctioned and collected.

しかし、第２図に示した吸引生検針によると、
吸引力は内針１を引いた際に発生する一時的なも
のであるため、患部組織がちぎれ難い場合は採取
が困難になることがある。 However, according to the aspiration biopsy needle shown in Figure 2,
Since the suction force is temporary and is generated when the inner needle 1 is pulled, collection may become difficult if the affected tissue is difficult to tear.

一方、内針と外針より成る二重針において、内
針の一部に扁平部を設け、この扁平部を介してシ
リンジの陰圧を外針の先端まで伝えようとする吸
引生検針がある。この吸引生検針は特開昭54−
137886号公報に示されているので詳細な説明は省
略する。 On the other hand, there is an aspiration biopsy needle with a double needle consisting of an inner needle and an outer needle, which has a flat part on a part of the inner needle and tries to transmit the negative pressure of the syringe to the tip of the outer needle through this flat part. . This aspiration biopsy needle was published in Japanese Patent Application Publication No. 1983-
Since it is disclosed in Japanese Patent No. 137886, detailed explanation will be omitted.

〔考案が解決しようとする問題点〕[Problem that the invention attempts to solve]

しかし、前記公開公報に示される吸引生検針に
よると、内針が外針と常時摺接する摺接部を有し
ているため、シリンジの陰圧が外針の先端まで十
分に伝わらないという欠点がある。更に、外径の
小さい内針を扁平にするため、内針の機械的強度
が低下するという欠点もある。従つて、内針を細
くするのに限度が生じる。 However, according to the aspiration biopsy needle disclosed in the above-mentioned publication, the inner needle has a sliding contact part that is constantly in sliding contact with the outer needle, so the negative pressure of the syringe is not sufficiently transmitted to the tip of the outer needle. be. Furthermore, since the inner needle with a small outer diameter is made flat, there is also a drawback that the mechanical strength of the inner needle is reduced. Therefore, there is a limit to how thin the inner needle can be made.

〔問題点を解決するための手段〕[Means for solving problems]

本考案は上記に鑑みてなされたものであり、シ
リンジで発生した陰圧を十分に外針の先端へ伝
え、かつ、内針の外径上の限界をなくするため、
内針を全長にわたつて同一の外径とし、外針の先
端部に内径の小さい肉厚部を設けるとともに外針
の他の部分の内径を肉厚部の内径より大にして空
間部を形成した吸引生検針を提供する。 The present invention was created in view of the above, and in order to sufficiently transmit the negative pressure generated in the syringe to the tip of the outer needle and eliminate the limit on the outer diameter of the inner needle,
The inner needle has the same outer diameter over its entire length, and a thick part with a small inner diameter is provided at the tip of the outer needle, and the inner diameter of the other part of the outer needle is larger than the inner diameter of the thick part to form a space. Provide an aspiration biopsy needle.

以下、本考案の吸引生検針を詳細に説明する。The suction biopsy needle of the present invention will be described in detail below.

〔実施例〕〔Example〕

第１図ａ，ｂは本考案の一実施例を示し、刃先
１ａを有する内針１は全長にわたつて同一の外径
を有し、刃先２ａを有する外針２は内径が小さい
肉厚部２ｂを先端に有する。外針２の肉厚部２ｂ
の長さは20〜50mmであり、その基部はシリンジに
結合されている。一方、内針１の基部はシリンジ
のピストンの先端に固定されている。外針２の肉
厚部２ｂが設けられていない部分には、シリンジ
の陰圧発生部に直結した空間部３が形成されてい
る。 1a and 1b show an embodiment of the present invention, in which an inner needle 1 having a cutting edge 1a has the same outer diameter over its entire length, and an outer needle 2 having a cutting edge 2a has a thick wall portion with a small inner diameter. 2b at the tip. Thick part 2b of outer needle 2
Its length is 20-50 mm, and its base is connected to a syringe. On the other hand, the base of the inner needle 1 is fixed to the tip of the piston of the syringe. In a portion of the outer needle 2 where the thick wall portion 2b is not provided, a space portion 3 is formed which is directly connected to the negative pressure generating portion of the syringe.

以上の構成において、第１図ａの状態で刃先１
ａ，２ａを患部に刺通して内針１を引くとシリン
ジ内に陰圧が発生する。この陰圧は外針２の肉厚
部２ｂと内針１の間隙を介して外針２の先端に伝
えられて組織の吸引を開始する。更に、内針１を
引くと内針１の刃先１ａが外針２の肉厚部２ｂよ
り離れて第１図ｂの状態になり、シリンジの陰圧
発生部と外針２の先端部が空間部３を介して直結
する。このため、シリンジの陰圧が外針２の先端
部に瞬間的に作用し、患部の組織を採取する。こ
のため、ちぎれ難い組織であつても確実に吸引し
て採取することができる。 In the above configuration, the cutting edge 1 is in the state shown in Figure 1a.
When the needles a and 2a are inserted into the affected area and the inner needle 1 is pulled, negative pressure is generated within the syringe. This negative pressure is transmitted to the tip of the outer needle 2 through the gap between the thick part 2b of the outer needle 2 and the inner needle 1, and suction of the tissue is started. Furthermore, when the inner needle 1 is pulled out, the cutting edge 1a of the inner needle 1 separates from the thick part 2b of the outer needle 2, resulting in the state shown in FIG. Directly connected via part 3. Therefore, the negative pressure of the syringe acts instantaneously on the tip of the outer needle 2 to collect tissue from the affected area. Therefore, even tissues that are difficult to tear can be reliably suctioned and collected.

〔考案の効果〕[Effect of idea]

以上説明した通り、本考案の吸引生検針による
と、内針を全長にわたつて同一の外径とし、外針
の先端部に内径の小さい肉厚部を設けるとともに
外針の他の部分の内径を肉厚部の内径より大にし
て空間部を形成したため、シリンジで発生した陰
圧を十分に外針の先端へ伝え、かつ、内針の外径
上の限界をなくすることができる。 As explained above, according to the aspiration biopsy needle of the present invention, the inner needle has the same outer diameter over its entire length, a thick part with a small inner diameter is provided at the tip of the outer needle, and the inner diameter of other parts of the outer needle Since the space is made larger than the inner diameter of the thick part, the negative pressure generated in the syringe can be sufficiently transmitted to the tip of the outer needle, and there is no limit on the outer diameter of the inner needle.

【図面の簡単な説明】[Brief explanation of drawings]

第１図ａ，ｂは本考案の一実施例を示す断面
図、第２図は従来の吸引生検針を示す断面図。 符号の説明、１……内針、１ａ……内針の刃
先、２……外針、２ａ……外針の刃先、２ｂ……
外針の肉厚部、３……空間部。 FIGS. 1a and 1b are cross-sectional views showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a conventional aspiration biopsy needle. Explanation of symbols: 1... Inner needle, 1a... Cutting edge of the inner needle, 2... Outer needle, 2a... Cutting edge of the outer needle, 2b...
Thick part of the outer needle, 3...space part.

Claims (1)

【実用新案登録請求の範囲】 二重針の先端にシリンジの陰圧を伝達して患部
組織を吸引採取する吸引生検針において、 全長において同一の外径を有する内針と、 先端の所定の長さにおいて前記内針の外径と略
等しい内径を有した肉厚部、および前記先端の所
定の長さ以外の部分において前記内針の外径より
大なる内径を有した空間形成部を有した外針を備
え、 前記外針の前記空間形成部によつて形成された
空間部がシリンジ陰圧源に直結されていることを
特徴とする吸引生検針。[Scope of Claim for Utility Model Registration] An aspiration biopsy needle that transmits negative pressure from a syringe to the tip of the double needle to aspirate and collect affected tissue, an inner needle having the same outer diameter along its entire length, and a predetermined length of the tip. and a space-forming portion having an inner diameter larger than the outer diameter of the inner needle at a portion other than a predetermined length of the tip. An aspiration biopsy needle comprising an outer needle, wherein a space formed by the space forming section of the outer needle is directly connected to a syringe negative pressure source.