WO1994003223A1 - Cannula - Google Patents

Cannula Download PDF

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Publication number
WO1994003223A1
WO1994003223A1 PCT/EP1993/001961 EP9301961W WO9403223A1 WO 1994003223 A1 WO1994003223 A1 WO 1994003223A1 EP 9301961 W EP9301961 W EP 9301961W WO 9403223 A1 WO9403223 A1 WO 9403223A1
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WO
WIPO (PCT)
Prior art keywords
cannula
tip
basic
cut
grinding
Prior art date
Application number
PCT/EP1993/001961
Other languages
German (de)
French (fr)
Inventor
Hans Haindl
Original Assignee
Hans Haindl
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 Hans Haindl filed Critical Hans Haindl
Priority to JP6504954A priority Critical patent/JPH07509634A/en
Priority to EP93917630A priority patent/EP0655006A1/en
Publication of WO1994003223A1 publication Critical patent/WO1994003223A1/en

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
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/158—Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
    • 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
    • A61M5/3286—Needle tip design, e.g. for improved penetration

Definitions

  • the invention relates to a cannula of the type known in the preamble of claim 1.
  • a cannula of the type in question is known from US Pat. No. 2,746,454 and from EP 0 301 246 B.1. It has a rigid cannula tube, which is ground at an angle at the tip and carries two further facet cuts, which are arranged at an angle to one another, on the front half of this connection.
  • the tip of the cannula is bent over the central axis of the cannula into the area between two imaginary parallel lines, which extend the inner surface and the outer surface of the cannula tube to the front.
  • the rear edge of the basic grinding is rounded inwards.
  • cannulas have been proposed from the point of view that such a bent cannula tip is less likely to puncture the opposite vessel wall when puncturing a blood vessel. Because of the reduced punching effect, such cannulas are also used for puncturing so-called implantable port catheters. With these port catheters, a membrane is pierced under the patient's skin and a drug is then injected through the cannula. Since these cannulas gouge out parts of the membrane when piercing these membranes, the portals quickly leak and the patient is burdened with the I Leu parts that are lifted out. These parts can also cause the system to fail.
  • the property of punching freedom is interesting not only for the above-described applications for puncturing port catheters, but also for puncturing body cavities, e.g. B. joints, for the purpose of injection of medication or the suction of liquids located therein.
  • Klinge and Müller were able to show that normal cannulas when puncturing human skin regularly lead to the formation of skin punch particles, which are mostly bacterially populated. This punching out of skin particles can be avoided by a low-punch or punch-free cannula, and this can reduce the risk of infection of the punctured body cavity, e.g. B. the joint.
  • the cannula known from EP 0 301 246 B1 very largely fulfills the requirements to be placed on such a ranule. Their suitability has been proven many times in practice, but it creates considerable manufacturing problems. On the one hand, these are due to the fact that, due to the relatively strong bend in the area of the cut, the cut typically bends outwards. This makes the cannula wider in the reed area. This can be partially compensated for by suitable bending devices. However, some of the cannulas are caused by the tensile forces that occur in the reed area Tearing in the rear edge of the scuff, especially where the weld of the welded cannula is located.
  • the invention is therefore based on the object of improving a cannula of the type in question so that it is simple to manufacture and has a low reject rate.
  • the puncture part which has a lancet-shaped tip with a facet cut, is less bent inwards than in the known cannulas. It is bent so far inwards that it lies within the inner cross section of the cannula tube, which is intended to be extended towards the front. This smaller bend primarily means that the
  • Fig. 2 is a plan view rotated by 90 degrees to
  • FIG. 3 shows a longitudinal section A-A through the puncture part of the cannula according to FIG. 2 on an enlarged scale
  • FIG. 4 shows an enlargement of the rear and side grinding edge of the rear grinding eye in accordance with the circular cutout B in FIG. 3.
  • the first and 2 consists of a cylindrical, rigid cannula tube 2, at the rear end of which a connection or a hose can be connected.
  • the cannula tube 2 is essentially straight. Its outside diameter d is preferably between 0.5 and 1.2 mm.
  • a through channel 3 can preferably have a diameter of 0.3-1.0 mm.
  • a ground tip 4 of the cannula tube 2 is curved in the direction of a central axis 6. This curvature is such that a tip 10 of the puncture part lies between lines 7, which are imaginary extensions of the inner cross section of the cannula.
  • a cut 5 of the cannula is composed of a basic cut 8 and two facet cuts 9 arranged at an angle to one another, which lead to the formation of a sharp tip 10.
  • the basic grinding 8 forms after
  • a relatively sharp edge 11 which has its greatest sharpness at the rear end of a grinding eye 12.
  • This entire edge which is shown in bold on one side in FIG. 2 and has the length L, is produced by bead blasting or a similar process blunted.
  • the basic grinding 8 is defused from the end of the facet to the rear end of the grinding eye 12, so that this part of the grinding no longer has a cutting effect.

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

The invention concerns a cannula, as illustrated in the figure 3, whose wall (2) is bent, at the tip (4), in towards the longitudinal axis (6) of the needle. The needle tip is ground to give a basic ground zone (8) and two facets, the whole interface between the basic zone and the inside surface of the bore being rounded so that they are blunt.

Description

Kanü l e  Cannula
Die Erfindung bezieht sich auf eine Kanüle der im Oberbegriff des Anspruchs 1 bekannten Art. The invention relates to a cannula of the type known in the preamble of claim 1.
Aus der US 2 746 454 und aus der EP 0 301 246 B.1 ist jeweils eine Kanüle der betreffenden Art bekannt. Sie weist ein starres Kanülenrohr auf, das an der Spitze schräg angeschliffen ist und auf der vorderen Hälfte dieses Anschliffes zwei weitere, gegeneinander winklig angeordnete sogenannte Facettenschliffe trägt. Die Spitze der Kanüle ist im Falle der EP 0 301 246 Bl über die Mittelachse der Kanüle hinweg bis in den Bereich zwischen zwei gedachten parallelen Linien gebogen, welche die Innenfläche und die Außenfläche des Kanulenrohres nach vorn verlängern. Die hintere Schneide des Grundschliffes ist einwärts gerundet.  A cannula of the type in question is known from US Pat. No. 2,746,454 and from EP 0 301 246 B.1. It has a rigid cannula tube, which is ground at an angle at the tip and carries two further facet cuts, which are arranged at an angle to one another, on the front half of this connection. In the case of EP 0 301 246 B1, the tip of the cannula is bent over the central axis of the cannula into the area between two imaginary parallel lines, which extend the inner surface and the outer surface of the cannula tube to the front. The rear edge of the basic grinding is rounded inwards.
Diese bekannten Kanülen sind unter dein Gesichtspunkt vorgeschlagen worden, daß eine derartig abgebogene Kanülenspitze beim Punktieren eines Blutgefäßes weniger leicht die gegenüberliegende Gefäßwand punktiert. Derartige Kanülen werden wegen des verringerten Stanzeffektes auch zum Punktieren sogenannter implantierbarer Portkatheter eingesetzt. Bei diesen Portkathetern wird unter der Haut des Patienten eine Membran angestochen und durch die Kanüle dann ein Medikament injiziert. Da diese Kanülen beim Anstechen dieser Membranen Teile der Membran heraushobeln, werden die Portkalheier schnell undicht , und der Patient wird mit den herausgehobe I Leu Teilen belastet.. Diese Teile können auch zum Versagen des Systems fuhren. These known cannulas have been proposed from the point of view that such a bent cannula tip is less likely to puncture the opposite vessel wall when puncturing a blood vessel. Because of the reduced punching effect, such cannulas are also used for puncturing so-called implantable port catheters. With these port catheters, a membrane is pierced under the patient's skin and a drug is then injected through the cannula. Since these cannulas gouge out parts of the membrane when piercing these membranes, the portals quickly leak and the patient is burdened with the I Leu parts that are lifted out. These parts can also cause the system to fail.
Es ist bekannt, daß dieses Hobeln oder Stanzen der Kanülen durch die hintere Schneide des Schliffes erfolgt. Den bisher vorgeschlagenen Losungen liegt der Gedanke zugründe, daß dieser Schliff gewissermaßen im Schatten der Spitze liegen und dadurch nicht mehr schneiden soll. Es hat sich in der Praxis aber herausgestellt, daß dies allein nicht ausreicht, um ein Stanzen zu verhindern. Deshalb wird in der EP 0 301 246 Bl auch beschrieben, daß das hintere Ende dieses Schliffes einwärts gerundet sein soll.  It is known that this planing or punching of the cannulas takes place through the rear cutting edge of the cut. The solutions proposed so far are based on the idea that this cut lies in the shadow of the tip and should therefore no longer cut. In practice, however, it has been found that this alone is not sufficient to prevent punching. Therefore, EP 0 301 246 B1 also describes that the rear end of this cut should be rounded inwards.
Die Eigenschaft der Stanzfreiheit ist nicht nur für die vorbeschriebenen Anwendungen zum Punktieren von Portkathetern interessant, sondern auch für die Punktion von Korperhohlen, z. B. Gelenken, zum Zwecke der Einspritzung von Medikamenten oder der Absaugung von darin befindlichen Flüssigkeiten. Klinge und Müller (Deutsches Arzteblatt 47/90) konnten zeigen, daß es mit normalen Kanülen beim Durchstich durch die menschliche Haut regelmäßig zur Ausbildung von Hautstanzpartikeln kommt, die zumeist bakteriell besiedelt sind. Dieses Ausstanzen von Hautpartikeln laßt sich durch eine stanzarme oder stanzfreie Kanüle vermeiden, und dadurch laßt sich die Gefahr einer Infektion der anpunktierten Korperhohle, z. B. des Gelenkes, herabsetzen .  The property of punching freedom is interesting not only for the above-described applications for puncturing port catheters, but also for puncturing body cavities, e.g. B. joints, for the purpose of injection of medication or the suction of liquids located therein. Klinge and Müller (Deutsches Arzteblatt 47/90) were able to show that normal cannulas when puncturing human skin regularly lead to the formation of skin punch particles, which are mostly bacterially populated. This punching out of skin particles can be avoided by a low-punch or punch-free cannula, and this can reduce the risk of infection of the punctured body cavity, e.g. B. the joint.
Die aus der EP 0 301 246 B1 bekannte Kanüle erfüllt die Anforderungen, die an eine solche Ranule zu stellen sind, sehr weitgehend. Ihre Eignung ist in der Praxis vielfach nachgewiesen worden, jedoch bereitet sie erhebliche fertigungstechnische Probleme. Diese sind zum einen dadurch bedingt, daß durch die relativ starke Biegung in Bereich des Schliffes der Schliff sich typischerweise nach außen aufbiegt. Dadurch wird die Kanüle im Schilffbereich breiter. Dies laßt sich durch geeignete Biegevorrichtungen zum Teil kompensieren. Bei einem Teil der Kanülen kommt es aber durch die in Schilffbereich auftretenden Zugkräfte zu Einrissen in der hinteren Schuffkante, und zwar insbesondere dort, wo sich die Schweißnaht der geschweißten Kanüle befindet. Wenn diese Einrisse auftreten, nimmt der Stanzeffekt der Kanüle schlagartig zu. Es ist bislang keinem Hersteller gelungen, diese Einrisse vollständig zu vermeiden. Die Stanzfreiheit der Kanülen kann nur durch Aussortieren einer relativ großen Ausschußmenge erreicht werden. Dies macht die Herstellung der Kanüle aufwendig und teuer, so daß sie für den Masseneinsatz, z. B. für Gelenkpunktionen, bislang vom Preis her nicht akzeptabel ist. The cannula known from EP 0 301 246 B1 very largely fulfills the requirements to be placed on such a ranule. Their suitability has been proven many times in practice, but it creates considerable manufacturing problems. On the one hand, these are due to the fact that, due to the relatively strong bend in the area of the cut, the cut typically bends outwards. This makes the cannula wider in the reed area. This can be partially compensated for by suitable bending devices. However, some of the cannulas are caused by the tensile forces that occur in the reed area Tearing in the rear edge of the scuff, especially where the weld of the welded cannula is located. If these tears occur, the punching effect of the cannula increases suddenly. So far, no manufacturer has been able to completely avoid these tears. The needles can be punched only by sorting out a relatively large reject quantity. This makes the manufacture of the cannula complex and expensive, so that it is suitable for mass use, e.g. B. for joint punctures, so far the price is not acceptable.
Der Erfindung liegt also die Aufgabe zugrunde, eine Kanüle der betreffenden Art so zu verbessern, daß sie einfach herzustellen ist und eine geringe Ausschußquote aufweist.  The invention is therefore based on the object of improving a cannula of the type in question so that it is simple to manufacture and has a low reject rate.
Diese Aufgabe wird durch die im Kennzeichen des Anspruchs angegebene Lehre gelöst. Erfindungsgemäß ist der Einstichteil, der eine lanzettförmige Spitze mit Facettenschliff aufweist, weniger stark als bei den vorbekannten Kanülen einwärts gebogen. Er wird so weit einwärts gebogen, daß sie innerhalb des nach vorn verlängert gedachten Innenquerschnittes des Kanülenrohres liegt. Diese geringere Biegung bedeutet primär eine Verschlechterung des  This object is achieved by the teaching specified in the characterizing part of the claim. According to the invention, the puncture part, which has a lancet-shaped tip with a facet cut, is less bent inwards than in the known cannulas. It is bent so far inwards that it lies within the inner cross section of the cannula tube, which is intended to be extended towards the front. This smaller bend primarily means that the
Stanzverhaltens gegenüber der Kanüle aus EP 0 301 246 B1. Dies wird aber dadurch kompensiert, daß nicht nur die hintere Schliffkante des Grundschliffes nach innen verrundet wird, sondern die gesamte innere Schliffkante des Grundschliffes verrundet ist. Versuche konnten zeigen, daß durch die Abstumpfung bzw. Verrundung dieser seitlichen Schuffkanten die Stanzneigung des Grundschliffes so abnimmt, so daß die Kanüle auch bei einer geringeren Biegung ihrer Spitze stanzfrei bleibt. Durch die geringere Biegung im Bereich der Kanülenspitze treten die vorbeschriebenen Schwierigkeiten bei der Fertigung nicht auf. Die erfindungsgemäße Kanüle ist somit stanzarm, einfach, billig und läßt sich ohne hohe Ausschußrate fertigen. Anhand der Zeichnung soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. Punching behavior compared to the cannula from EP 0 301 246 B1. However, this is compensated for by the fact that not only is the rear cut edge of the basic cut rounded inwards, but the entire inner cut edge of the basic cut is rounded. Experiments have shown that the blunt or rounding of these flank edges reduces the punching tendency of the basic grinding so that the cannula remains punch-free even with a slight bend in its tip. Due to the smaller bend in the area of the cannula tip, the above-mentioned difficulties in production do not occur. The cannula according to the invention is thus low punch, simple, cheap and can be manufactured without a high reject rate. The invention will be explained in more detail using an exemplary embodiment with reference to the drawing.
Es zeigt: It shows:
Fig. 1 eine Seitenansicht der Kanüle,  1 is a side view of the cannula,
Fig. 2 eine um 90 Grad gedrehte Draufsicht auf die  Fig. 2 is a plan view rotated by 90 degrees to
Kanüle nach Fig. 1,  1,
Fig. 3 einen Längsschnitt A-A durch den Einstichteil der Kanüle nach Fig. 2 in vergrößertem Maßstab, und  3 shows a longitudinal section A-A through the puncture part of the cannula according to FIG. 2 on an enlarged scale, and
Fig. 4 eine Vergrößerung der hinteren und seitlichen Schliffkante des hinteren Schliffauges entsprechend dem kreisförmigen Ausschnitt B in Fig. 3.  4 shows an enlargement of the rear and side grinding edge of the rear grinding eye in accordance with the circular cutout B in FIG. 3.
Kanüle 1 nach Fig. 1 und 2 besteht aus einem zylindrischen, starren Kanülenrohr 2, an dessen hinterem Ende ein Anschluß oder ein Schlauch angeschlossen sein kann. Das Kanülenrohr 2 ist im wesentlichen gerade. Sein Außendurch- messer d liegt vorzugsweise zwischen 0.5 und 1,2 mm. Ein Durchgangskanal 3 kann vorzugsweise Durchmesser von 0,3 - 1,0 mm aufweisen. Eine angeschliffene Spitze 4 des Kanülenrohres 2 ist in Richtung auf eine Mittelachse 6 gekrümmt. Diese Krümmung ist dergestalt, daß eine Spitze 10 des Einstichteiles zwischen Linien 7, die gedachte Verlängerungen des Innenquerschnitts der Kanüle sind, liegt. 1 and 2 consists of a cylindrical, rigid cannula tube 2, at the rear end of which a connection or a hose can be connected. The cannula tube 2 is essentially straight. Its outside diameter d is preferably between 0.5 and 1.2 mm. A through channel 3 can preferably have a diameter of 0.3-1.0 mm. A ground tip 4 of the cannula tube 2 is curved in the direction of a central axis 6. This curvature is such that a tip 10 of the puncture part lies between lines 7, which are imaginary extensions of the inner cross section of the cannula.
Ein Schliff 5 der Kanüle setzt sich zusammen aus einem Grundschliff 8 und zwei im Winkel zueinander angebrachten Facettenschliffen 9, die zur Ausbildung einer scharfen Spitze 10 führen. Der Grundschliff 8 bildet nach dem  A cut 5 of the cannula is composed of a basic cut 8 and two facet cuts 9 arranged at an angle to one another, which lead to the formation of a sharp tip 10. The basic grinding 8 forms after
Schleifen mit der Innenwandung der Kanüle 1 zunächst eine relativ scharfe Kante 11, die ihre größte Schärfe am hinteren Ende eines Schliffauges 12 hat. Diese gesamte Kante, die in Fig. 2 einseitig fett dargestellt ist und die Länge L hat, wird durch Perlstrahlen oder ein ähnliches Verfah ren abgestumpft. Dadurch wird der Grundschliff 8 vom Ende der Facette bis zum hinteren Ende des Schliffauges 12 entschärft, so daß von diesem Teil des Schliffes keine schneidende Wirkung mehr ausgeht. Grinding with the inner wall of the cannula 1 first a relatively sharp edge 11, which has its greatest sharpness at the rear end of a grinding eye 12. This entire edge, which is shown in bold on one side in FIG. 2 and has the length L, is produced by bead blasting or a similar process blunted. As a result, the basic grinding 8 is defused from the end of the facet to the rear end of the grinding eye 12, so that this part of the grinding no longer has a cutting effect.

Claims

Patentanspruch Claim
Kanüle mit einem starren Kanülenrohr (2) und einem schrägen Anschliff (5), der sich aus einem Grundsσhliff (8) und zwei im Winkel zueinander stehenden Facettenschliffen (9) zusammensetzt und dessen Spitze (4) in Richtung auf die Kanülenmittelachse (6) einwärts gebogen ist, dadurch gekennzeichnet, daß die Spitze (10) der Kanüle (1) innerhalb des nach vorn verlängert gedachten Innenquerschnittes des Kanülenrohres (2) liegt und daß die gesamte Kante zwischen dem Grundschliff (8) und der inneren Oberfläche des Kanülenrohres abstumpfend verrundet ist. Cannula with a rigid cannula tube (2) and an oblique bevel (5), which is composed of a basic cut (8) and two facet cuts (9) at an angle to each other and its tip (4) in the direction of the cannula central axis (6) inwards is curved, characterized in that the tip (10) of the cannula (1) lies within the inner cross section of the cannula tube (2), which is thought to be extended towards the front, and in that the entire edge between the basic grinding (8) and the inner surface of the cannula tube is bluntly rounded .
PCT/EP1993/001961 1992-08-10 1993-07-23 Cannula WO1994003223A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP6504954A JPH07509634A (en) 1992-08-10 1993-07-23 cannula
EP93917630A EP0655006A1 (en) 1992-08-10 1993-07-23 Cannula

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4226476.6 1992-08-10
DE19924226476 DE4226476C1 (en) 1992-08-10 1992-08-10

Publications (1)

Publication Number Publication Date
WO1994003223A1 true WO1994003223A1 (en) 1994-02-17

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Application Number Title Priority Date Filing Date
PCT/EP1993/001961 WO1994003223A1 (en) 1992-08-10 1993-07-23 Cannula

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Country Link
EP (1) EP0655006A1 (en)
JP (1) JPH07509634A (en)
DE (1) DE4226476C1 (en)
WO (1) WO1994003223A1 (en)

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US6936031B2 (en) 2000-12-12 2005-08-30 Gambro Dasco S.P.A. Site for access to the inside of a channel, and corresponding cannula
WO2002078772A1 (en) * 2001-03-28 2002-10-10 Miyako Kamata Medical syringe, and method of producing the same
DE102011112021A1 (en) 2011-08-31 2013-02-28 Hans Haindl Puncture cannula
WO2013030327A1 (en) 2011-08-31 2013-03-07 Hans Haindl Cannula that reduces puncture particles
DE102011112021B4 (en) * 2011-08-31 2013-10-24 Hans Haindl Puncture cannula

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DE4226476C1 (en) 1993-08-12
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