WO1998046295A1 - Aiguille dont la pointe ressemble a celle d'un crayon - Google Patents

Aiguille dont la pointe ressemble a celle d'un crayon 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
Authority
WO
WIPO (PCT)
Prior art keywords
opening
needle
point
openings
axis
Prior art date
Application number
PCT/JP1997/001265
Other languages
English (en)
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/fr
Publication of WO1998046295A1 publication Critical patent/WO1998046295A1/fr

Links

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.

Landscapes

  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

L'invention concerne une aiguille dont la pointe ressemble à celle d'un crayon, comprenant une partie tubulaire (2) cylindrique partant d'une extrémité pointue (1) conique et une ouverture (3) formée dans la partie comprise entre l'extrémité pointue et la partie tubulaire. Lorsque ladite aiguille est placée horizontalement et que son ouverture (3) est tournée vers le haut, la face d'extrémité (6) annulaire de l'ouverture (3) est placée à la périphérie d'une colonne elliptique ou ovale dont un axe est perpendiculaire à l'axe de l'aiguille. Au moins deux ouvertures peuvent être ménagées dans ladite aiguille. Lorsque au moins deux ouvertures sont ménagées dans l'aiguille, elles doivent avoir la même forme et la même dimension, et lorsqu'il y a plus de deux ouvertures, celles-ci doivent être disposées à des intervalles réguliers, de sorte que leur surface totale soit égale à celle que présenterait une seule ouverture (3).
PCT/JP1997/001265 1997-04-11 1997-04-11 Aiguille dont la pointe ressemble a celle d'un crayon WO1998046295A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1997/001265 WO1998046295A1 (fr) 1997-04-11 1997-04-11 Aiguille dont la pointe ressemble a celle d'un crayon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1997/001265 WO1998046295A1 (fr) 1997-04-11 1997-04-11 Aiguille dont la pointe ressemble a celle d'un crayon

Publications (1)

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

Family

ID=14180398

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1997/001265 WO1998046295A1 (fr) 1997-04-11 1997-04-11 Aiguille dont la pointe ressemble a celle d'un crayon

Country Status (1)

Country Link
WO (1) WO1998046295A1 (fr)

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 (ja) * 1992-02-13 1995-07-12 株式会社ユニシス ペンシルポイント針
JP3018360U (ja) * 1995-05-19 1995-11-21 株式会社八光電機製作所 スパイナル針

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0730031Y2 (ja) * 1992-02-13 1995-07-12 株式会社ユニシス ペンシルポイント針
JP3018360U (ja) * 1995-05-19 1995-11-21 株式会社八光電機製作所 スパイナル針

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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