WO1998046295A1 - Pencil point needle - Google Patents

Pencil point needle Download PDF

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Publication number
WO1998046295A1
WO1998046295A1 PCT/JP1997/001265 JP9701265W WO9846295A1 WO 1998046295 A1 WO1998046295 A1 WO 1998046295A1 JP 9701265 W JP9701265 W JP 9701265W WO 9846295 A1 WO9846295 A1 WO 9846295A1
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WO
WIPO (PCT)
Prior art keywords
opening
needle
point
openings
axis
Prior art date
Application number
PCT/JP1997/001265
Other languages
French (fr)
Japanese (ja)
Inventor
Ryochi Enishi
Akio Higuchi
Original Assignee
Soken Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Soken Co., Ltd. filed Critical Soken Co., Ltd.
Priority to PCT/JP1997/001265 priority Critical patent/WO1998046295A1/en
Publication of WO1998046295A1 publication Critical patent/WO1998046295A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; 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
    • A61M5/329—Needles; 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
    • A61M5/3291—Shafts with additional lateral openings

Definitions

  • the present invention relates to a pencil point needle having a substantially conical point used for spinal anesthesia and the like.
  • the pencil point needle is provided with an opening through which cerebrospinal fluid flows in at the transition from the point to the tube.
  • the conventional annular end face of the opening has a shape in which the outer peripheral edge is larger than the inner peripheral edge, and the opening expands from the inner side to the outer side.
  • the annular end face As shown in Publication No. 1, on the side peripheral surface of a cylinder or prism whose axis extends in a direction perpendicular to the needle axis, when the needle axis is horizontal and the opening faces upward, the annular end face The outer and inner perimeters were the same height.
  • the inner peripheral edge of the annular end face is oval or elliptical, and its shortest is larger than the inner radius of the tube to increase the opening area. It was considerably smaller than the outer diameter of the tube. As a result, there was a problem that the pencil point needle was easily bent from the opening because the bending strength of the portion where the opening was formed was considerably smaller than that of the other portion of the tube.
  • the present invention has been made to solve this problem, and an object of the present invention is to provide a pencil point needle which has a relatively large bending strength at an opening and is hard to bend. Disclosure of the invention
  • an oval or elliptical opening provided at a portion connecting a sharp end of a pencil point needle to a pipe portion is provided on a side peripheral surface of an oval or elliptical cylinder whose annular end surface is perpendicular to the needle axis. It is formed to be located.
  • a plurality of openings having the same shape and the same size may be provided equiangularly with respect to the needle axis.
  • the total opening area of the plurality of openings is defined as a predetermined opening area.
  • the bending strength of the pencil point needle at the opening is the square of the minimum diameter, that is, the square of the height of the lowest point of the outer peripheral edge of the opening when the needle axis is horizontal and the opening is directly above. Proportional.
  • the lowest point of the inner peripheral edge of the opening of the present invention is the same height as the lowest point of the inner peripheral edge of the conventional opening having the same opening area.
  • the lowest point of the outer peripheral edge of the conventional opening is at the same level as the lowest point of the inner peripheral edge, but the lowest point of the outer peripheral edge of the opening of the present invention is located at a position higher than the lowest point of the inner peripheral edge by the thickness of the pipe.
  • the bending strength of the portion of the pencil point needle of the present invention where the opening is formed is higher than that of the conventional one.
  • the minor diameter of the opening becomes one or two or thirteen when compared to the one with one opening, and the opening of the pencil point needle Since the minimum diameter of the cross section, that is, the height of the lowest point of the outer peripheral edge of the opening approaches the outer diameter of the pipe, the bending strength of the portion where the opening is formed is greatly increased, and is almost the same as other parts of the pipe become.
  • FIG. 1 is an enlarged view of a main part of a pencil point needle according to a first embodiment of the present invention.
  • FIG. 2 is an enlarged front view showing a main part of the pencil point needle according to the first embodiment of the present invention.
  • FIG. 3 is a view showing the cross section of the opening in FIG. 1 in a further enlarged manner.
  • FIG. 4 is a diagram corresponding to FIG. 1 of the second embodiment.
  • FIG. 5 is a diagram corresponding to FIG. 3 of the second embodiment.
  • FIG. 6 is a diagram corresponding to FIG. 1 of the third embodiment.
  • FIG. 7 is a diagram corresponding to FIG. 3 of the third embodiment.
  • the point 1 of the pencil point needle has a slightly puffy conical shape, and a cylindrical tube 2 is continuous with the point 1.
  • the opening 3 of the first embodiment is oval, and when viewed in the opening direction, its shape is constant without expanding or reducing from inside to outside.
  • the opening 3 is formed by electric discharge machining.
  • the opening 3 is located at a point where the point 1 transitions to the pipe 2.
  • the height other than both ends of the opening 3, that is, the minimum diameter of the pencil point needle in the opening 3 is the height of the other part of the tube 2. That is, it is smaller than the outer diameter. Since the bending strength of the portion where the opening of the pencil point needle is formed is determined by this height, the bending strength of the portion of the tube 2 where the opening 3 is formed is smaller than the other portions of the tube 2.
  • the annular end surface 6 of the opening 3 formed in the tube portion 2 is parallel to the opening direction, and is located on the side peripheral surface of an elongated cylinder or an elliptic cylinder whose axis is orthogonal to the needle axis. . Therefore, the outer peripheral edge 4 is located at a position higher than the inner peripheral edge 5 by at least the thickness of the tube portion 2.
  • the minimum diameter of the cross section that determines the bending strength of the pencil point needle at the portion where the opening 3 is formed in the first embodiment is the height HI of the lowest point of the outer peripheral edge 4 of the opening 3. This minimum diameter HI is larger than the height H 0 of the lowest point on the inner peripheral edge by the thickness of the pipe portion or more.
  • the pencil point needle of the present invention has a larger bending strength at the portion where the opening is formed than the conventional one, and is hard to bend.
  • the second embodiment shown in FIGS. 4 and 5 has a tube portion 2 having the same diameter as that of the first embodiment.
  • Shaped openings 32, 32 are formed.
  • the major diameters of the openings 32 and 32 are the same as those of the first embodiment, but the minor diameter is approximately one-two of that of the first embodiment.
  • the total opening area is the same as that of the first embodiment.
  • the annular end faces 6 of the openings 32 are parallel to the respective opening directions, and the axis is located on the side peripheral surface in an elliptical cylinder or ellipse perpendicular to the needle axis.
  • the minimum cross-sectional diameter for determining the bending strength of the portion where the opening is formed in the second embodiment is a distance H between the lowest points of the outer peripheral edges at the center in the longitudinal direction of the two openings 32, 32 opposed in the diameter direction. According to 2. Since the minimum diameter H2 of the cross section is larger than that of the first embodiment and slightly smaller than the outer radius of the tube portion 2, the bending strength of the portion where the opening of the pencil point needle is formed is smaller than that of the opening. Since it is slightly smaller than the other parts, there is very little risk that the pencil point needle will break from the opening.
  • the third embodiment shown in FIGS. 6 and 7 has a tube portion 2 having the same diameter as the first embodiment, and the tube portion 2 has three identical shapes at equiangular positions around the needle axis. Large elliptical or outer circular openings 33, 33, 33 are formed. This opening 3
  • the major axis of 3, 33, 33 is the same as that of the first embodiment, and the minor axis is It is approximately 1/3 of that of the embodiment.
  • the total opening area of the three openings is the same as that of the first embodiment.
  • the annular end faces 6 of the openings 33 are parallel to the respective opening directions, and are located on the side peripheral surface in an elliptical cylinder or ellipse whose axis is orthogonal to the needle axis.
  • the minimum cross-sectional diameter that determines the bending strength of the portion where the opening is formed in the third embodiment is the height H 3 of the lowest point on the outer peripheral edge located at the center in the longitudinal direction of the opening 33. Since the minimum diameter H3 of the cross section is substantially the same as the outer radius of the tube portion 2, the bending strength of the portion where the opening is formed is substantially the same as that of the tube portion other than the opening of the vencil point needle. Therefore, it can be said that the pencil point needle of the third embodiment has almost no risk of breakage from the opening.

Abstract

A pencil point needle including a cylindrical tube portion (2) leading from a conical sharpened tip (1), and an opening (3) formed at the portion between the sharpened tip and the tube portion. When the pencil point needle is placed horizontally with the opening (3) up, the annular end face (6) of the opening (3) is positioned in the periphery of an elliptic or oval column having an axis perpendicular to the needle axis. Two or more openings may be provided. When two or more openings are provided, they are made to have identical shapes and sizes and arranged at regular angular intervals around the needle such that their total area is equal to that of the opening (3) singly provided.

Description

明細書 ペンシルポイン ト針 技術分野  Description Pencil Point Needle Technical Field
この発明は、 脊髄麻酔等に使用される尖端部が略円錐状のペンシルポ イント針に関するものである。 背景技術  The present invention relates to a pencil point needle having a substantially conical point used for spinal anesthesia and the like. Background art
ペンシルポイン ト針は尖端部から管部へ移行する部分に髄液を流入さ せる開口部が設けられる。  The pencil point needle is provided with an opening through which cerebrospinal fluid flows in at the transition from the point to the tube.
従来の開口部の環状端面は、 外周縁が内周縁よりも大きく、 開口が内 側から外側へ拡大する形状であり、 多くの場合、 開口部の環状端面は、 実公平 7— 3 0 0 3 1号公報に図示されているように、 針軸に直交する 方向に軸心が延長する円柱又は角柱の側周面上にあり、 針軸を水平にし て開口部を上へ向けると、 環状端面の外周縁と内周縁は同一高さであつ た。 又、 環状端面の内周縁は長円形又は楕円形であり、 その短怪は開口 面積を大きくするため管部の内半径よりも大きくしていたため、 開口部 におけるペンシルポイン ト針の断面最小怪は管部の外径に比較して相当 小さかった。 その結果、 開口部を形成した部分の曲げ強度は管部の他の 部分よりもかなり小さいため、 ペンシルポイント針は開口部から折れ曲 がりやすいという問題があった。  The conventional annular end face of the opening has a shape in which the outer peripheral edge is larger than the inner peripheral edge, and the opening expands from the inner side to the outer side. As shown in Publication No. 1, on the side peripheral surface of a cylinder or prism whose axis extends in a direction perpendicular to the needle axis, when the needle axis is horizontal and the opening faces upward, the annular end face The outer and inner perimeters were the same height. In addition, the inner peripheral edge of the annular end face is oval or elliptical, and its shortest is larger than the inner radius of the tube to increase the opening area. It was considerably smaller than the outer diameter of the tube. As a result, there was a problem that the pencil point needle was easily bent from the opening because the bending strength of the portion where the opening was formed was considerably smaller than that of the other portion of the tube.
本発明はこの問題を解決するためになされたものであり、 その目的は 開口部の曲げ強度が比較的大きくて折れ曲がりにくいペンシルポイント 針を提供することにある。 発明の開示 The present invention has been made to solve this problem, and an object of the present invention is to provide a pencil point needle which has a relatively large bending strength at an opening and is hard to bend. Disclosure of the invention
本発明は、 ペンシルポイント針の尖端部から管部に接続する部分に設 ける長円形又は楕円形の開口部を、 その環状端面が針軸に垂直な長円柱 又は楕円柱の側周面上に位置するように形成したことにある。 これによ り、 開口部の環状端面の内周縁と外周縁は開口方向に見ると合致し、 開 口は内側から外側へ拡大も縮小もせず一定となる。  According to the present invention, an oval or elliptical opening provided at a portion connecting a sharp end of a pencil point needle to a pipe portion is provided on a side peripheral surface of an oval or elliptical cylinder whose annular end surface is perpendicular to the needle axis. It is formed to be located. As a result, the inner peripheral edge and the outer peripheral edge of the annular end face of the opening coincide when viewed in the opening direction, and the opening does not expand or contract from inside to outside, and becomes constant.
所定の開口面積を有する 1つの開口部を設ける代わりに、 複数の同形 同大の開口部を針軸に関して等角的に設けてもよい。 この場合、 複数の 開口部の開口面積の合計を所定の開口面積とする。  Instead of providing one opening having a predetermined opening area, a plurality of openings having the same shape and the same size may be provided equiangularly with respect to the needle axis. In this case, the total opening area of the plurality of openings is defined as a predetermined opening area.
開口部におけるペンシルポイント針の曲げ強度は、 最小径の自乗、 す なわち、 針軸を水平にして開口部を真上にしたときの、 開口部の外周縁 の最低点の高さの自乗に比例する。  The bending strength of the pencil point needle at the opening is the square of the minimum diameter, that is, the square of the height of the lowest point of the outer peripheral edge of the opening when the needle axis is horizontal and the opening is directly above. Proportional.
開口部が 1個の場合、 本発明の開口部の内周縁最低点は同一開口面積 を有する従来の開口部の内周縁最低点と同一高さである。 従来の開口部 の外周縁最低点は内周縁最低点と同じレベルにあるが、 本発明開口部の 外周縁最低点は、 内周縁最低点よりも管部の厚さ以上の高い位置にある から、 本発明のペンンシルポイント針の開口部を形成した部分の曲げ強 度は従来のものよりも大きい。  When there is one opening, the lowest point of the inner peripheral edge of the opening of the present invention is the same height as the lowest point of the inner peripheral edge of the conventional opening having the same opening area. The lowest point of the outer peripheral edge of the conventional opening is at the same level as the lowest point of the inner peripheral edge, but the lowest point of the outer peripheral edge of the opening of the present invention is located at a position higher than the lowest point of the inner peripheral edge by the thickness of the pipe. However, the bending strength of the portion of the pencil point needle of the present invention where the opening is formed is higher than that of the conventional one.
特に、 開口部を 2個又は 3個設けたものは、 開口部が 1個のものに比 ベると、 開口部の短径が 1ノ 2又は 1 3になり、 ペンシルポイント針 の開口部における断面最小径、 すなわち、 開口部の外周縁最低点の高さ は管部の外径に近づくから、 開口部を形成した部分の曲げ強度は大幅に 増加し、 管部の他の部分と略同一になる。 図面の簡単な説明  In particular, when two or three openings are provided, the minor diameter of the opening becomes one or two or thirteen when compared to the one with one opening, and the opening of the pencil point needle Since the minimum diameter of the cross section, that is, the height of the lowest point of the outer peripheral edge of the opening approaches the outer diameter of the pipe, the bending strength of the portion where the opening is formed is greatly increased, and is almost the same as other parts of the pipe become. BRIEF DESCRIPTION OF THE FIGURES
第 1図は、 本発明第 1実施例のペンシルポイント針の要部を拡大して 示す平面図である。 FIG. 1 is an enlarged view of a main part of a pencil point needle according to a first embodiment of the present invention. FIG.
第 2図は、 本発明第 1実施例のペンシルポイント針の要部を拡大して 示す正面図である。  FIG. 2 is an enlarged front view showing a main part of the pencil point needle according to the first embodiment of the present invention.
第 3図は、 第 1図の開口部の横断面をさらに拡大して示す図である。 第 4図は、 第 2実施例の第 1図に相当する図である。  FIG. 3 is a view showing the cross section of the opening in FIG. 1 in a further enlarged manner. FIG. 4 is a diagram corresponding to FIG. 1 of the second embodiment.
第 5図は、 第 2実施例の第 3図に相当する図である。  FIG. 5 is a diagram corresponding to FIG. 3 of the second embodiment.
第 6図は、 第 3実施例の第 1図に相当する図である。  FIG. 6 is a diagram corresponding to FIG. 1 of the third embodiment.
第 7図は、 第 3実施例の第 3図に相当する図である。 発明を実施するための最良の形態  FIG. 7 is a diagram corresponding to FIG. 3 of the third embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
第 1図に示すように、 ペンシルポイント針の尖端部 1は少しふくらん だ円錐形であり、 その尖端部 1に円筒形の管部 2が連続する。 第 1実施 例の開口部 3は長円形であり、 開口方向に見ると、 その形状は内から外 へ拡大も縮小もせず一定である。 この開口部 3は放電加工により形成さ れる。  As shown in FIG. 1, the point 1 of the pencil point needle has a slightly puffy conical shape, and a cylindrical tube 2 is continuous with the point 1. The opening 3 of the first embodiment is oval, and when viewed in the opening direction, its shape is constant without expanding or reducing from inside to outside. The opening 3 is formed by electric discharge machining.
第 2図に示すように、 開口部 3は尖端部 1から管部 2へ移行する部分 に位置する。 針軸を水平にして、 開口部 3を上に向けたとき、 開口部 3 の両端以外の高さ、 すなわち開口部 3におけるペンシルポイント針の最 小径は、 管部 2の他の部分の高さすなわち外径よりも小さい。 この高さ によりペンシルポイント針の開口部が形成された部分の曲げ強度が決定 するから、 管部 2の開口部 3が形成された部分の曲げ強度は管部 2の他 の部分よりも小さい。  As shown in FIG. 2, the opening 3 is located at a point where the point 1 transitions to the pipe 2. When the needle axis is horizontal and the opening 3 is facing upward, the height other than both ends of the opening 3, that is, the minimum diameter of the pencil point needle in the opening 3 is the height of the other part of the tube 2. That is, it is smaller than the outer diameter. Since the bending strength of the portion where the opening of the pencil point needle is formed is determined by this height, the bending strength of the portion of the tube 2 where the opening 3 is formed is smaller than the other portions of the tube 2.
第 3図に示すように、 管部 2に形成した開口部 3の環状端面 6は開口 方向に平行であり、 針軸に軸心が直交する長円柱または楕円柱の側周面 上に位置する。 したがって、 外周縁 4は内周縁 5より少なくとも管部 2 の厚さよりも高い位置にある。 第 1実施例の開口部 3が形成された部分におけるペンシルポイント針 の曲げ強度を決定する断面最小径は、 開口部 3の外周縁 4の最低点の高 さ H Iである。 この最小径 H Iは、 内周縁最低点の高さ H 0よりも管部 の厚さ以上に大きい。 第 1実施例の開口面積と同一開口面積を有する従 来の開口部は、 外周縁と内周縁が同一レベルであるから、 すなわち、 開 口部におけるペンシルポイント針の断面最小径は H 0であるから、 本発 明のペンシルポイント針は、 従来のものよりも開口部が形成された部分 の曲げ強度が大きく折れ曲がりにくい。 As shown in FIG. 3, the annular end surface 6 of the opening 3 formed in the tube portion 2 is parallel to the opening direction, and is located on the side peripheral surface of an elongated cylinder or an elliptic cylinder whose axis is orthogonal to the needle axis. . Therefore, the outer peripheral edge 4 is located at a position higher than the inner peripheral edge 5 by at least the thickness of the tube portion 2. The minimum diameter of the cross section that determines the bending strength of the pencil point needle at the portion where the opening 3 is formed in the first embodiment is the height HI of the lowest point of the outer peripheral edge 4 of the opening 3. This minimum diameter HI is larger than the height H 0 of the lowest point on the inner peripheral edge by the thickness of the pipe portion or more. In the conventional opening having the same opening area as the opening area of the first embodiment, the outer peripheral edge and the inner peripheral edge are at the same level, that is, the minimum cross-sectional diameter of the pencil point needle at the opening is H0. Therefore, the pencil point needle of the present invention has a larger bending strength at the portion where the opening is formed than the conventional one, and is hard to bend.
第 4図及び第 5図に示す第 2実施例は、 第 1実施例と同径の管部 2を 有し、 その管部 2には直径方向に 2つの同形同大の長円形ないし楕円形 の開口部 3 2、 3 2が形成される。 この開口部 3 2、 3 2の長径は第 1 実施例のものと同一であるが、 短径は第 1実施例のものの略 1ノ 2であ り、 2つの開口部 3 2、 3 2の合計開口面積は第 1実施例のものと同一 である。 開口部 3 2の環状端面 6はそれぞれの開口方向に平行であり、 軸心が針軸に直交する長円柱又は楕円中の側周面に位置する。  The second embodiment shown in FIGS. 4 and 5 has a tube portion 2 having the same diameter as that of the first embodiment. Shaped openings 32, 32 are formed. The major diameters of the openings 32 and 32 are the same as those of the first embodiment, but the minor diameter is approximately one-two of that of the first embodiment. The total opening area is the same as that of the first embodiment. The annular end faces 6 of the openings 32 are parallel to the respective opening directions, and the axis is located on the side peripheral surface in an elliptical cylinder or ellipse perpendicular to the needle axis.
第 2実施例の開口部が形成された部分の曲げ強度を決定する断面最小 径は、 直径方向に相対する 2つの開口部 3 2、 3 2の長手方向中央の外 周縁最低点間の距離 H 2による。 この断面最小径 H 2は第 1実施例のも のよりも大きく、 管部 2の外半径より少し小さい程度であるから、 ペン シルポイント針の開口部が形成された部分の曲げ強度は開口部以外の部 分よりわずかに小さい程度となるから、 ペンシルポイント針が開口部か ら折れるおそれは非常に小さい。  The minimum cross-sectional diameter for determining the bending strength of the portion where the opening is formed in the second embodiment is a distance H between the lowest points of the outer peripheral edges at the center in the longitudinal direction of the two openings 32, 32 opposed in the diameter direction. According to 2. Since the minimum diameter H2 of the cross section is larger than that of the first embodiment and slightly smaller than the outer radius of the tube portion 2, the bending strength of the portion where the opening of the pencil point needle is formed is smaller than that of the opening. Since it is slightly smaller than the other parts, there is very little risk that the pencil point needle will break from the opening.
第 6図及び第 7図に示す第 3実施例は第 1実施例と同径の管部 2を有 し、 その管部 2には針軸を中心とする等角位置に 3つの同形同大の長円 形ないし外円形の開口部 3 3、 3 3、 3 3が形成される。 この開口部 3 The third embodiment shown in FIGS. 6 and 7 has a tube portion 2 having the same diameter as the first embodiment, and the tube portion 2 has three identical shapes at equiangular positions around the needle axis. Large elliptical or outer circular openings 33, 33, 33 are formed. This opening 3
3、 3 3、 3 3の長径は第 1実施例のものと同一であり、 短径は第 1実 施例のものの略 1 / 3である。 3つの開口部を合計した開口面積は第 1 実施例のものと同一である。 開口部 3 3の環状端面 6はそれぞれの開口 方向に平行であり、 軸心が針軸に直交する長円柱又は楕円中の側周面に 位置する。 The major axis of 3, 33, 33 is the same as that of the first embodiment, and the minor axis is It is approximately 1/3 of that of the embodiment. The total opening area of the three openings is the same as that of the first embodiment. The annular end faces 6 of the openings 33 are parallel to the respective opening directions, and are located on the side peripheral surface in an elliptical cylinder or ellipse whose axis is orthogonal to the needle axis.
第 3実施例の開口部が形成された部分の曲げ強度を決定する断面最小 径は、 開口部 3 3の長手方向中央に位置する外周縁最低点の高さ H 3で ある。 この断面最小径 H 3は管部 2の外半径に略同一であるから、 開口 部が形成された部分の曲げ強度はべンシルポイン ト針の開口部以外の管 部と実質的に同一である。 したがって、 第 3実施例のペンシルポイント 針は、 開口部から破損するおそれはほとんどないといえる。  The minimum cross-sectional diameter that determines the bending strength of the portion where the opening is formed in the third embodiment is the height H 3 of the lowest point on the outer peripheral edge located at the center in the longitudinal direction of the opening 33. Since the minimum diameter H3 of the cross section is substantially the same as the outer radius of the tube portion 2, the bending strength of the portion where the opening is formed is substantially the same as that of the tube portion other than the opening of the vencil point needle. Therefore, it can be said that the pencil point needle of the third embodiment has almost no risk of breakage from the opening.

Claims

請求の範囲 The scope of the claims
1. 円錐状の尖端部 （1) に円筒状の管部 （2) が続き、 前記尖端部か ら前記管部に移行する部分に所定の開口面積を有する 1つ以上の開口部1. A conical point (1) followed by a cylindrical tube (2), and one or more openings having a predetermined opening area at the transition from the point to the tube.
(3、 32、 32、 33、 33、 33) が設けられたペンシルポイント 針であって、 針軸を水平に、 前記開口部を上に向けたとき、 前記開口部A pencil point needle provided with (3, 32, 32, 33, 33, 33), wherein the needle axis is horizontal and the opening is upward when the opening is directed upward.
(3 ; 32、 32； 33, 33、 33) は軸心が針軸に垂直な長円柱又 は楕円柱の側周面上に位置する環状端面 （6) からなることを特徴とす るペンシルポイン ト針。 (3; 32, 32; 33, 33, 33) is a pencil characterized in that it has an annular end surface (6) located on the side peripheral surface of an elliptical cylinder or elliptical cylinder whose axis is perpendicular to the needle axis. Point needle.
2. 針軸を中心として直径方向に 2つの同形同大の開口部 （32、 32) が設けられたことを特徴とする請求の範囲 1記載のペンシルポイント針。  2. The pencil point needle according to claim 1, wherein two openings (32, 32) having the same shape and the same size are provided in the diameter direction about the needle shaft.
3. 針軸を中心として等角的に 3つ以上の同形同大の開口部 （33、 3 3、 33) が設けられたことを特徴とする請求の範囲 1記載のペンシル ポイン ト針。  3. The pencil point needle according to claim 1, wherein three or more equal-sized and same-sized openings (33, 33, 33) are provided isometrically around the needle axis.
PCT/JP1997/001265 1997-04-11 1997-04-11 Pencil point needle WO1998046295A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1997/001265 WO1998046295A1 (en) 1997-04-11 1997-04-11 Pencil point needle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1997/001265 WO1998046295A1 (en) 1997-04-11 1997-04-11 Pencil point needle

Publications (1)

Publication Number Publication Date
WO1998046295A1 true WO1998046295A1 (en) 1998-10-22

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Application Number Title Priority Date Filing Date
PCT/JP1997/001265 WO1998046295A1 (en) 1997-04-11 1997-04-11 Pencil point needle

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WO (1) WO1998046295A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6916292B2 (en) 2002-07-12 2005-07-12 Depuy Spine, Inc. Bone marrow aspirator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0730031Y2 (en) * 1992-02-13 1995-07-12 株式会社ユニシス Pencil point needle
JP3018360U (en) * 1995-05-19 1995-11-21 株式会社八光電機製作所 Spinal needle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0730031Y2 (en) * 1992-02-13 1995-07-12 株式会社ユニシス Pencil point needle
JP3018360U (en) * 1995-05-19 1995-11-21 株式会社八光電機製作所 Spinal needle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6916292B2 (en) 2002-07-12 2005-07-12 Depuy Spine, Inc. Bone marrow aspirator

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