EP0042036A1 - Method and apparatus for making tubular pieces with a closed, shaped end portion - Google Patents

Method and apparatus for making tubular pieces with a closed, shaped end portion Download PDF

Info

Publication number
EP0042036A1
EP0042036A1 EP81102052A EP81102052A EP0042036A1 EP 0042036 A1 EP0042036 A1 EP 0042036A1 EP 81102052 A EP81102052 A EP 81102052A EP 81102052 A EP81102052 A EP 81102052A EP 0042036 A1 EP0042036 A1 EP 0042036A1
Authority
EP
European Patent Office
Prior art keywords
melting
pipe
pipe section
melt
end region
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP81102052A
Other languages
German (de)
French (fr)
Inventor
Gerd Fischbeck
Martin Mineur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympia Werke AG
Original Assignee
Olympia Werke AG
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 Olympia Werke AG filed Critical Olympia Werke AG
Publication of EP0042036A1 publication Critical patent/EP0042036A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21G—MAKING NEEDLES, PINS OR NAILS OF METAL
    • B21G1/00—Making needles used for performing operations
    • B21G1/08—Making needles used for performing operations of hollow needles or needles with hollow end, e.g. hypodermic needles, larding-needles

Definitions

  • the invention relates to a method and a device for carrying out the method according to the preamble of claim 1.
  • Pipe pieces of this type serve as cannulas or hollow needles for connecting cavities.
  • cannulas are inserted into human or animal tissue and blood vessels, and layers of the skin are first pierced.
  • the cannulas used here are tubes of the smallest diameter with an integrally formed tip, which allow the direct passage of, for example, flowable injection medium in the direction of penetration.
  • it is provided in complex and expensive process steps with several levels and, if necessary, hollow-ground surfaces which run at different angles to the direction of penetration.
  • a membrane or a sealing plug made of, for example, a silicone rubber and having a thicker layer must be pierced.
  • crumbling of the closure material has been shown, which is carried in the ink to the print head transferred to a print carrier.
  • the cutting material is destroyed by the cutting action of the cannula tip. Ink escapes during operation.
  • the closure can no longer be used because the opening no longer closes completely even when using highly elastic materials for the sealing pad.
  • Hollow needles are used in the ink circulation device of the inkjet printer according to DE-OS 25 52 513, the longitudinal cavity of which is closed by sealing the outlet opening.
  • the sealing point is formed into a tip in order to penetrate a partition wall which closes an ink cartridge.
  • the flow of ink through the hollow needle is achieved through openings made in the peripheral surface of the hollow needle, which openings lead into the longitudinal cavity.
  • the tip To manufacture the tip, it is known to place a preformed tip on the face of the hollow needle, which is initially still open, with a shoulder that is immersed in the longitudinal bore by a few tenths of a millimeter. The tip is fixed to the hollow needle using a brazing process.
  • the use of such hollow needles for connecting cavities filled with ink has the disadvantage of corrosion between the tip and tube material and the solder in continuous operation.
  • the object of the invention is the production of corrosion-free pipe pieces, hollow needles, cannulas and the like in the upper Concept of claim 1 specified type for use as connecting elements with chemically active liquid filled spaces.
  • the object of the invention is achieved by the method specified in claim 1.
  • the formation for forming the tip consists of the tube material.
  • the material of the same type supplied to the melt from the heated pipe material in accordance with claim 2 forms a homogeneous structure with the pipe material, which can be formed into a tip by machining or advantageously by non-cutting shaping.
  • non-cutting shaping the amount of filler material supplied can be kept low, since material is not lost in comparison to machining.
  • claim 3 shows the particular advantage that heat can be supplied in a targeted manner.
  • a general clamping device can be used according to claim 4, the receiving part for the pipe piece are, for example, mutually adjustable jaws made of a thermally conductive material, whereby the oxidation zone given by the heating process can be kept within very small limits and that the structural difference of heated Zone and non-heated zone resulting electrical voltage potential is low.
  • Figure 1 shows the area of a device in which a pipe section 1 is clamped. It is understood that for mass production, the device is provided with a large number of receiving areas. One of two clamping jaws 10 has been shown, which can be moved relative to one another for clamping the pipe section. The tube piece 1 is inserted in such a way that its tube end, which is first inserted into the device between the clamping jaws 10, is guided against a system 16, so that a predetermined region 15 protrudes from the clamping device.
  • the protruding area 15 is heated. To avoid a stronger oxidation process, this is done with the exclusion of oxygen with, for example, an argon gas.
  • the end region 5 of the pipe section 1 which transitions into the melt 6 runs approximately in the manner shown in FIG.
  • the clamping point and essentially from the area of the heated tube end 5 correspond to the arrows marked 11 Heat is dissipated, so that due to the higher mass of the clamping jaws 10, despite their low melting point, they do not melt and there is also no melt flow between the clamping jaws among one another and between the clamping jaws and the pipe section 1.
  • an additional material made of the same material as the pipe section for example a chrome-nickel steel, is supplied, which takes the shape indicated by 7 above the pipe end, which is essentially a spherical or spherical shape.
  • the filler material 7 combines with the material of the pipe section and with the end region 5 formed in the first heating process.
  • FIGS. 4 and 5 show two hollow needles 1, the filler material 7 applied being formed into a cone shape 8 by cutting or advantageously by cutting without cutting according to FIG.
  • Figure 6 shows an advantageous embodiment for the formation of the so designed tip 8 with a convex tapered surface. Openings 3 are let into the end regions 5, for example by an erosion process, which extend into the longitudinal cavity 2 and emerge on the lateral surface 17 of each pipe section 1.
  • FIG. 6 corresponds to the dash-dotted area Z from FIG. 4.
  • the pipe section 1 has been provided with a bore 3 and the conical projection 8.
  • the transition of the inner lateral surface of the bore 3 into the outer lateral surface 17 of the pipe section 1 is advantageously rounded as a result of the eroding process (at arrow 12).
  • the structure resulting from the two heat processes structures or the structural zones that result after cooling are each identified by a thin dashed line 19.
  • Form 7 can be achieved if the area 15 protruding from the copper jaws 10 in FIG. 1 is extended by a multiple, that is to say by a dimension necessary for the shaping of the conical shape 8.
  • the area 5 of the pipe end 5 protruding from the copper jaws 10 is melted down without filler material and then results in a molding, as has been designated by 7 in FIG.
  • the further processing stages in accordance with FIGS. 4 to 6 are retained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The production method and the apparatus for this are concerned with the formation of conical tips (8) on tubular pieces (1), hollow needles, cannulas and the like. The tips (8) are formed with or without machining from a shape (7) which has been formed in advance with the aid of an additional material of the same type under the action of heat or without additional material from a length of tube material to be fused in. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Durchführung des Verfahrens nach dem Oberbegriff des Anspruchs 1.The invention relates to a method and a device for carrying out the method according to the preamble of claim 1.

Rohrstücke dieser Art dienen als Kanülen oder Hohlnadeln dem Verbinden von Hohlräumen. In der Medizin werden Kanülen in das menschliche oder tierische Gewebe und Blutgefäße eingeführt und es werden dabei zunächst Schichten der Haut durchstoßen. Die hier verwendeten Kanülen sind Röhrchen kleinsten Durchmessers mit angeformter Spitze, die den direkten Durchgang von beispielsweise fließfähigem Injektionsmedium in Durchstoßrichtung gestatten. Zur Verbesserung der Wirkung der Spitze beim Einführen der Kanüle in das Gewebe ist diese in aufwendigen und teuren Verfahrensschritten mit mehreren Ebenen und gegebenenfalls hohlschliffartigen Flächen versehen, die unter verschiedenen Winkeln zur Durchstoßrichtung verlaufen.Pipe pieces of this type serve as cannulas or hollow needles for connecting cavities. In medicine, cannulas are inserted into human or animal tissue and blood vessels, and layers of the skin are first pierced. The cannulas used here are tubes of the smallest diameter with an integrally formed tip, which allow the direct passage of, for example, flowable injection medium in the direction of penetration. In order to improve the effect of the tip when inserting the cannula into the tissue, it is provided in complex and expensive process steps with several levels and, if necessary, hollow-ground surfaces which run at different angles to the direction of penetration.

Beim Durchstoßen von Verschlüssen von Infusionsflaschen unter Verwendung mit derartigen Flächenschliffen angespitzter Kanülen kommt es zum Abbröckeln von Material aus dem Flaschenverschluß heraus. Das Abbröckeln wird im wesentlichen hervorgerufen durch scharfkantige, spitzwinklige und stumpfwinklige Übergänge zwischen Schliffläche und Schliffläche und Schlifffläche und Innen- bzw. Außenmantelfläche der Kanüle.When puncturing closures of infusion bottles using cannulas sharpened with such surface cuts, material crumbles out of the bottle stopper. The crumbling is essentially caused by sharp-edged, acute-angled and obtuse-angled transitions between the grinding surface and the grinding surface and the grinding surface and the inner and outer lateral surface of the cannula.

Beim Anschluß eines mit einer Tinte gefüllten Beutels an ein Tintenschreibwerk muß eine Membran oder ein in seiner Dicke verstärkter Verschlußstopfen aus beispielsweise einem Silikongummi durchstoßen werden. Auch hier hat sich bei Verwendung von Kanülen mit Flächenschliff ein Abbröckeln von Verschlußmaterial gezeigt, das in der Tinte zum diese auf einen Druckträger übertragenen Schreibkopf mitgeführt wird. Durch die Schneidwirkung der Kanülenspitze wird das Verschlußmaterial zerstört. Es tritt während des Betriebes Tinte aus. Der Verschluß ist nicht mehr zu verwenden, da die Öffnung selbst bei Verwendung stark elastischer Materialien für das Abdichtpolster nicht mehr vollständig schließt.When a bag filled with ink is connected to an ink writing mechanism, a membrane or a sealing plug made of, for example, a silicone rubber and having a thicker layer must be pierced. Here too, when using surface-cut cannulas, crumbling of the closure material has been shown, which is carried in the ink to the print head transferred to a print carrier. The cutting material is destroyed by the cutting action of the cannula tip. Ink escapes during operation. The closure can no longer be used because the opening no longer closes completely even when using highly elastic materials for the sealing pad.

In der Tintenumwälzeinrichtung des Tintenstrahldruckers nach der DE-OS 25 52 513 werden Hohlnadeln verwendet, deren Längshohlraum durch Abdichten der Austrittsöffnung verschlossen ist. Die Abdichtstelle ist zu einer Spitze angeformt zum Durchdringen einer eine Tintenpatrone verschließenden Scheidewand. Der Tintenfluß durch die Hohlnadel wird durch in die Umfangsfläche der Hohlnadel eingelassene Öffnungen erreicht, die bis in den Längshohlraum geführt sind.Hollow needles are used in the ink circulation device of the inkjet printer according to DE-OS 25 52 513, the longitudinal cavity of which is closed by sealing the outlet opening. The sealing point is formed into a tip in order to penetrate a partition wall which closes an ink cartridge. The flow of ink through the hollow needle is achieved through openings made in the peripheral surface of the hollow needle, which openings lead into the longitudinal cavity.

Zur Herstellung der Spitze ist es bekannt, auf die zunächst noch offene Stirnseite der Hohlnadel eine vorgeformte Spitze zu setzen mit einem in die Längsbohrung um wenige Zehntel Millimeter eintauchenden Ansatz. Die Spitze wird in einem Hartlötverfahren an der Hohlnadel festgesetzt. Die Verwendung solcher Hohlnadeln zum Verbinden mit Tinte gefüllter Hohlräume hat im Dauerbetrieb den Nachteil der Korrosion zwischen dem Material von Spitze und Röhrchen und dem Lot.To manufacture the tip, it is known to place a preformed tip on the face of the hollow needle, which is initially still open, with a shoulder that is immersed in the longitudinal bore by a few tenths of a millimeter. The tip is fixed to the hollow needle using a brazing process. The use of such hollow needles for connecting cavities filled with ink has the disadvantage of corrosion between the tip and tube material and the solder in continuous operation.

Aufgabe der Erfindung ist die Herstellung korrosionsfreier Rohrstücke, Hohlnadeln, Kanülen und dergleichen der im Oberbegriff des Anspruchs 1 angegebenen Art für den Einsatz als Verbindungselemente mit chemisch aktiver Flüssigkeit gefüllter Räume.The object of the invention is the production of corrosion-free pipe pieces, hollow needles, cannulas and the like in the upper Concept of claim 1 specified type for use as connecting elements with chemically active liquid filled spaces.

Der Aufgabenteil der Erfindung wird gelöst durch das im Anspruch 1 angegebene Verfahren. Neben dem Ersparnis eines Zusatzwerkstoffes und dessen Handhabung ist von Vorteil, daß die Anformung zur Bildung der Spitze aus dem Rohrwerkstoff besteht. Der der Schmelze aus dem erwärmten Rohrmaterial zugeführte artgleiche Werkstoff entsprechend Anspruch 2 bildet mit dem Rohrmaterial ein homogenes Gefüge, das spanend oder in vorteilhafter Weise durch spanlose Formgebung zu einer Spitze ausgebildet werden kann. Bei der spanlosen Formgebung kann die zugeführte Menge an Zusatzwerkstoff gering gehalten werden, da im Vergleich zur spanenden Formung Material nicht verloren geht.The object of the invention is achieved by the method specified in claim 1. In addition to the saving of an additional material and its handling, it is advantageous that the formation for forming the tip consists of the tube material. The material of the same type supplied to the melt from the heated pipe material in accordance with claim 2 forms a homogeneous structure with the pipe material, which can be formed into a tip by machining or advantageously by non-cutting shaping. In the case of non-cutting shaping, the amount of filler material supplied can be kept low, since material is not lost in comparison to machining.

Neben dem Ausschluß der Sauerstoffatmosphäre während des Erwärm- und des Schweißvorganges zeigt Anspruch 3 den besonderen Vorteil, daß Wärme gezielt zugeführt werden kann.In addition to the exclusion of the oxygen atmosphere during the heating and welding process, claim 3 shows the particular advantage that heat can be supplied in a targeted manner.

Zur Durchführung des Verfahrens kann entsprechend Anspruch 4 eine allgemeine Spannvorrichtung verwendet werden, deren Aufnahmeteil für das Rohrstück beispielsweise gegeneinander verstellbare Backen aus einem wärmeleitfähigen Werkstoff sind, wodurch die durch den Erwärmungsvorgang gegebene Oxydationszone in kleinsten Grenzen gehalten werden kann und daß sich aus dem Strukturunterschied von erwärmter Zone und nicht erwärmter Zone ergebende elektrische Spannungspotential gering ist.To carry out the method, a general clamping device can be used according to claim 4, the receiving part for the pipe piece are, for example, mutually adjustable jaws made of a thermally conductive material, whereby the oxidation zone given by the heating process can be kept within very small limits and that the structural difference of heated Zone and non-heated zone resulting electrical voltage potential is low.

Im folgenden wird die Erfindung anhand von Ausführungsbeispielen in der Zeichnung beschrieben.The invention is described below using exemplary embodiments in the drawing.

Es zeigen:

  • Figur 1 ein zwischen Spannbacken einer Aufnahmevorrichtung eingesetztes Rohrstück,
  • Figur 2 das Rohrstück als Folge der Erwärmung,
  • Figur 3 ein Rohrstück nach der Materialzufuhr,
  • Figuren 4 und 5 je eine fertige Kanüle und
  • . Figur 6 eine vergrößerte Darstellung des Ausbruches Z in Figur 4.
Show it:
  • FIG. 1 shows a tube piece inserted between clamping jaws of a holding device,
  • FIG. 2 the pipe section as a result of the heating,
  • FIG. 3 shows a piece of pipe after the material feed,
  • Figures 4 and 5 each a finished cannula and
  • . FIG. 6 shows an enlarged view of the breakout Z in FIG. 4.

Figur 1 zeigt den Bereich einer Vorrichtung, in dem ein Rohrstück 1 eingespannt ist. Es versteht sich, daß für eine Massenfertigung die Vorrichtung mit einer großen Anzahl an Aufnahmebereichen versehen ist. Es ist eine von zwei Spannbacken 10 dargestellt worden, die gegeneinander zum Verspannen des Rohrstückes bewegbar sind. Das Einsetzen des Rohrstückes 1 erfolgt in der Weise, daß dessen zunächst in die Vorrichtung zwischen die Spannbacken 10 eingeführtes Rohrende gegen eine Anlage 16 geführt wird, so daß ein vorbestimmter Bereich 15 aus der Spannvorrichtung herausragt.Figure 1 shows the area of a device in which a pipe section 1 is clamped. It is understood that for mass production, the device is provided with a large number of receiving areas. One of two clamping jaws 10 has been shown, which can be moved relative to one another for clamping the pipe section. The tube piece 1 is inserted in such a way that its tube end, which is first inserted into the device between the clamping jaws 10, is guided against a system 16, so that a predetermined region 15 protrudes from the clamping device.

Der herausragende Bereich 15 wird erwärmt. Zur Vermeidung eines stärkeren Oxydationsgeschehens erfolgt dieses unter Sauerstoffabschluß mit beispielsweise einem Argongas. Der in Schmelze 6 übergehende Endbereich 5 des Rohrstückes 1 verläuft in etwa in der in Figur 2 dargestellten Weise. Als Folge der hohen Wärmeleitfähigkeit der beispielsweise Kupferbacken 10 wird von der Einspannstelle und im wesentlichen aus dem Bereich des erwärmten Rohrendes 5 entsprechend der mit 11 gekennzeichneten Pfeile Wärme abgeführt, so daß aufgrund der höheren Masse der Spannbacken 10 trotz niederen Schmelzpunktes diese nicht schmelzen und es auch zu keinem Schmelzfluß zwischen den Spannbacken untereinander und zwischen den Spannbacken und dem Rohrstück 1 kommt.The protruding area 15 is heated. To avoid a stronger oxidation process, this is done with the exclusion of oxygen with, for example, an argon gas. The end region 5 of the pipe section 1 which transitions into the melt 6 runs approximately in the manner shown in FIG. As a result of the high thermal conductivity of, for example, copper jaws 10, the clamping point and essentially from the area of the heated tube end 5 correspond to the arrows marked 11 Heat is dissipated, so that due to the higher mass of the clamping jaws 10, despite their low melting point, they do not melt and there is also no melt flow between the clamping jaws among one another and between the clamping jaws and the pipe section 1.

In einer weiteren Erwärmungsstufe unter gleichfalls Ausschluß von Sauerstoffatmosphäre wird ein Zusatzwerkstoff aus gleichartigem Material wie das Rohrstück, beispielsweise einem Chrom-Nickel-Stahl zugeführt, der über dem Rohrende die mit 7 angedeutete Form einnimmt, die im wesentlichen eine kugelige oder ballige Form ist. Der Zusatzwerkstoff 7 verbindet sich mit dem Werkstoff des Rohrstückes und mit dem in dem ersten Wärmeprozeß gebildeten Endbereich 5.In a further heating stage, also excluding oxygen, an additional material made of the same material as the pipe section, for example a chrome-nickel steel, is supplied, which takes the shape indicated by 7 above the pipe end, which is essentially a spherical or spherical shape. The filler material 7 combines with the material of the pipe section and with the end region 5 formed in the first heating process.

In den Figuren 4 und 5 sind zwei Hohlnadeln 1 dargestellt worden, wobei entsprechend Figur 5 der aufgebrachte Zusatzwerkstoff 7 durch spanende oder in vorteilhafterweise durch spanlose formgebung zu einer Kegelform 8 ausgebildet wurde. Figur 6 zeigt eine vorteilhafte Ausführungsform für die Ausbildung der so gestalteten Spitze 8 mit konvexer Kegelmantelfläche. In die Endbereiche 5 sind öffnungen 3 eingelassen, beispielsweise durch einen Errodiervorgang, die in den Längshohlraum 2 hineinreichen und auf der Mantelfläche 17 jedes Rohrstückes 1 austreten.FIGS. 4 and 5 show two hollow needles 1, the filler material 7 applied being formed into a cone shape 8 by cutting or advantageously by cutting without cutting according to FIG. Figure 6 shows an advantageous embodiment for the formation of the so designed tip 8 with a convex tapered surface. Openings 3 are let into the end regions 5, for example by an erosion process, which extend into the longitudinal cavity 2 and emerge on the lateral surface 17 of each pipe section 1.

Die vergrößerte Darstellung in Figur 6 entspricht dem strichpunktierten Bereich Z aus Figur 4. Hierbei ist das Rohrstück 1 mit einer Bohrung 3 und der kegeligen Anformung 8 versehen worden. Der übergang der Innenmantelfläche der Bohrung 3 in die Außenmantelfläche 17 des Rohrstückes 1 ist als Folge des Errodier-Prozesses in vorteilhafter Weise abgerundet (bei Pfeil 12). Die sich als Folge der beiden Wärmeprozesse ergebenden Strukturen bzw. die nach dem Erkalten sich ergebenden Gefügezonen sind mit jeweils einer dünnen Strichpunktlinie 19 gekennzeichnet. Entsprechend einem vorgenommenen Schliffbild ergeben sich drei von der Struktur her unterschiedliche Gefügezonen mit groberem Gefüge im weniger erwärmten Teil des Rohrstückes 1, mit feinem Gefüge in der durch Auftragsschweißen und anfolgende Bearbeitung hergestellten Spitze und mittlerem Gefüge zwischen den Linien 19.The enlarged illustration in FIG. 6 corresponds to the dash-dotted area Z from FIG. 4. Here, the pipe section 1 has been provided with a bore 3 and the conical projection 8. The transition of the inner lateral surface of the bore 3 into the outer lateral surface 17 of the pipe section 1 is advantageously rounded as a result of the eroding process (at arrow 12). The structure resulting from the two heat processes structures or the structural zones that result after cooling are each identified by a thin dashed line 19. According to a grinding pattern, there are three structurally different microstructure zones with a coarser microstructure in the less heated part of the pipe section 1, with a fine microstructure in the tip produced by cladding and subsequent processing, and a medium microstructure between the lines 19.

In der Weiterbildung des Erfindungsgedankens hat sich gezeigt, daß dann ohne einen Zusatzwerkstoff die über dem Rohrende 5 . gebildete Form 7 erzielbar ist, wenn der aus den Kupferbacken 10 herausragende Bereich 15 in Figur 1 um ein Mehrfaches, also um ein für die Anformung der Kegelform 8 notwendiges Maß verlängert wird. Der aus den Kupferbacken 10 überstehende Bereich 5 des Rohrendes 5 wird ohne Zusatzwerkstoff eingeschmolzen und ergibt dann eine Anformung, wie sie in Figur 3 mit 7 bezeichnet worden ist. Die weiteren Bearbeitungsstufen entsprechend der Figuren 4 bis 6 werden beibehalten.In the development of the inventive concept, it has been shown that without an additional material, the pipe 5. Form 7 can be achieved if the area 15 protruding from the copper jaws 10 in FIG. 1 is extended by a multiple, that is to say by a dimension necessary for the shaping of the conical shape 8. The area 5 of the pipe end 5 protruding from the copper jaws 10 is melted down without filler material and then results in a molding, as has been designated by 7 in FIG. The further processing stages in accordance with FIGS. 4 to 6 are retained.

Claims (4)

1. Fertigungsverfahren für Rohrstücke mit verschlossenem, jedoch angeformtem Endbereich zum Durchstoßen einer Schicht und zumindest einer im wesentlichen quer zur Durchstoßrichtung liegenden, in den Längshohlraum geführten Öffnung auf der Umfangsfläche, dadurch gekennzeichnet, daß das Rohrstück (1) in seinem einen Endbereich (5) bis zum Schmelzen erwärmt und nach dem Erstarren der Schmelze in einer für das Durchstoßen erforderlichen Anformung (8) angespitzt wird.1. Manufacturing method for pipe sections with a closed but integrally formed end area for piercing a layer and at least one opening in the longitudinal cavity on the circumferential surface lying essentially transversely to the piercing direction, characterized in that the tube section (1) in its one end area (5) heated to the point of melting and, after the melt has solidified, it is sharpened in a formation (8) required for puncturing. 2. Fertigungsverfahren nach Anspruch 1, dadurch gekennzeichnet , daß das Rohrstück (1) in seinem einen Endbereich (5) bis zum Schmelzen erwärmt wird, daß der verlaufenden Schmelze (6) Schmelzgut (7) eines artgleichen Werkstoffes zugeführt wird in einer für die Anformung (8) ausreichenden Menge und daß der Endbereich (5) nach dem Erstarren der Schmelze in einer für das Durchstoßen erforderlichen Anformung (8) angespitzt wird.2. Manufacturing method according to claim 1, characterized in that the pipe section (1) is heated in its one end region (5) until melting, that the running melt (6) melting material (7) of a similar material is supplied in a for the molding (8) sufficient quantity and that the end region (5) is sharpened after the solidification of the melt in a formation (8) required for puncturing. 3. Verfahren nach Anspruch 1 oder 2, dadurch ge kennzeichnet , daß das in seiner Länge bestimmte Rohrstück (1) in einer Haltevorrichtung (10) aufgenommen wird, wobei der Endbereich (5) des Rohrstückes (1) um ein für das Schmelzen bestimmtes Maß (15) aus der Haltevorrichtung (10) frei herausragt und daß Schmelzen und ggf. Auftragsschweißen unter einem inerten Gas und im besonderen einem Argongas erfolgt.3. The method according to claim 1 or 2, characterized in that the length of the pipe section (1) is received in a holding device (10), the end region (5) of the pipe section (1) by a certain amount for melting (15) protrudes freely from the holding device (10) and that melting and, if necessary, build-up welding takes place under an inert gas and in particular an argon gas. 4. Vorrichtung zur Aufnahme von Rohrstücken der Art nach Anspruch 1, dadurch gekennzeichnet , daß zumindest der mit dem Rohrstück (1) und nahe dessen Erwärmungszone in Berührung befindliche Aufnahmeteil (10) der Vorrichtung aus einem besonders wärmeleitenden Material besteht.4. A device for receiving pipe pieces of the type according to claim 1, characterized in that at least the receiving part (10) of the device which is in contact with the pipe piece (1) and near its heating zone consists of a particularly heat-conducting material.
EP81102052A 1980-06-13 1981-03-19 Method and apparatus for making tubular pieces with a closed, shaped end portion Withdrawn EP0042036A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3022193 1980-06-13
DE19803022193 DE3022193A1 (en) 1980-06-13 1980-06-13 METHOD AND DEVICE FOR PRODUCING TUBE PIECES WITH A CLOSED, MOLDED END AREA

Publications (1)

Publication Number Publication Date
EP0042036A1 true EP0042036A1 (en) 1981-12-23

Family

ID=6104537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102052A Withdrawn EP0042036A1 (en) 1980-06-13 1981-03-19 Method and apparatus for making tubular pieces with a closed, shaped end portion

Country Status (2)

Country Link
EP (1) EP0042036A1 (en)
DE (1) DE3022193A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991001007A1 (en) * 1989-07-07 1991-01-24 Baxter International Inc. Assembly for removing waste from closed sample containers
US5315887A (en) * 1988-06-23 1994-05-31 Baxter Diagnostics Inc. Multiport equalization probe
US5413000A (en) * 1988-06-23 1995-05-09 Dade International Inc. Assembly for removing waste from closed sample containers
WO2008055001A1 (en) * 2006-10-31 2008-05-08 Medtronic, Inc. Injection needle having lateral delivery ports and method for the manufacture thereof

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109864C2 (en) * 1991-03-26 1993-11-04 Johann Dr Med Rull PUNCH-FREE INJECTION CANNULA
US5360416A (en) * 1993-09-30 1994-11-01 Sherwood Medical Company Thin-walled anesthesia needles
DE9400470U1 (en) * 1994-01-13 1994-03-03 Rau, Roland, Dr.med., 77723 Gengenbach needle
DE19512607A1 (en) * 1995-04-04 1996-10-10 Johann Dr Med Rull Completely tragmentation-free cannulas

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1591021A (en) * 1924-09-27 1926-07-06 Davis & Geck Inc Needle
US2679570A (en) * 1951-08-18 1954-05-25 Bell Telephone Labor Inc Formation of electrode tip by electric current heating
CH450334A (en) * 1966-02-07 1968-01-31 Braun Fa B Earless sewing needle and method of making it
DE2203309A1 (en) * 1972-01-25 1973-08-09 Josef Kappenstein SURGICAL COMPOSITE NEEDLES
DE2552513A1 (en) * 1974-12-23 1976-07-01 Ibm INK REVOLUTION DEVICE ON AN INKJET PRINTER
DE2905398A1 (en) * 1979-02-13 1980-08-14 Josef W Ing Grad Kappenstein Composite surgical needle - comprises corrosion resistant sleeve and core wire fused together at needle end

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1591021A (en) * 1924-09-27 1926-07-06 Davis & Geck Inc Needle
US2679570A (en) * 1951-08-18 1954-05-25 Bell Telephone Labor Inc Formation of electrode tip by electric current heating
CH450334A (en) * 1966-02-07 1968-01-31 Braun Fa B Earless sewing needle and method of making it
DE2203309A1 (en) * 1972-01-25 1973-08-09 Josef Kappenstein SURGICAL COMPOSITE NEEDLES
DE2552513A1 (en) * 1974-12-23 1976-07-01 Ibm INK REVOLUTION DEVICE ON AN INKJET PRINTER
DE2905398A1 (en) * 1979-02-13 1980-08-14 Josef W Ing Grad Kappenstein Composite surgical needle - comprises corrosion resistant sleeve and core wire fused together at needle end

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5315887A (en) * 1988-06-23 1994-05-31 Baxter Diagnostics Inc. Multiport equalization probe
US5413000A (en) * 1988-06-23 1995-05-09 Dade International Inc. Assembly for removing waste from closed sample containers
WO1991001007A1 (en) * 1989-07-07 1991-01-24 Baxter International Inc. Assembly for removing waste from closed sample containers
WO2008055001A1 (en) * 2006-10-31 2008-05-08 Medtronic, Inc. Injection needle having lateral delivery ports and method for the manufacture thereof

Also Published As

Publication number Publication date
DE3022193A1 (en) 1981-12-24

Similar Documents

Publication Publication Date Title
DE2462386C3 (en) Device for continuous casting of wires or threads from a melt
DE69311336T2 (en) Injection molding supported by gas
DE69012124T2 (en) IMPROVEMENTS IN TEETH TREATMENT.
DE69710694T2 (en) Method of shaping a catheter tip
DE1095513B (en) Device for producing squeeze tubes from a section of a pipe made of organic thermoplastic with a tube head molded in one piece onto the tube jacket
DE2249033B2 (en) Device for melting and distributing thermoplastic material
DE1208477B (en) Method and device for producing hollow strings from thermoplastic material
DE2229881A1 (en) Device for the production of core / sheath composite threads
EP0435025B1 (en) Apparatus for introducing a gas into the cavity of an injection mould for making hollow plastic bodies
DE2303583A1 (en) PROCESS FOR MANUFACTURING LONG ELEMENTS THAT CONSIST MAINLY OF THERMOPLASTIC POLYMERIC COMPOSITIONS AND ARE USED AS TIPS IN WRITING MATERIALS
EP0042036A1 (en) Method and apparatus for making tubular pieces with a closed, shaped end portion
DE69813739T2 (en) One-step process for chamfering and deburring
DE3642124C2 (en) Process for the production of bristle goods and device for carrying out the process
DE2854365C2 (en) Resin writing tip for a liquid ink writing instrument
EP0227060B1 (en) Filling wedge for an apparatus making gelatin capsules
DE2457423C2 (en) Method and device for producing a strand from a metallic melt
DE1565553A1 (en) Electrolyte conduction probe and method and device for their production
EP0139841B1 (en) Method and apparatus for producing a hollow thermoplastic body by blow-moulding
DE2555295C2 (en) A method of manufacturing a nozzle unit of an ink drop pen
DE69521417T2 (en) CAPILLARY TUBE AND METHOD FOR THE PRODUCTION THEREOF
DE3246671A1 (en) MELTING SPINNING OVENS
DE2460131C3 (en) Process for coating the edge and the implementation of a nozzle
DE3927122C2 (en)
DD301876A9 (en) Method of shaping glass, and mold and apparatus therefor
DE10021881A1 (en) Device for producing one or more extruded profiles with variable cross-sections in press direction comprises holed press bar with axially displaceable mandrel

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

AK Designated contracting states

Designated state(s): BE DE FR GB NL

18W Application withdrawn

Withdrawal date: 19811112

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MINEUR, MARTIN

Inventor name: FISCHBECK, GERD