DE1954891A1 - Process for the production of injection needles with a plastic attachment - Google Patents
Process for the production of injection needles with a plastic attachmentInfo
- Publication number
- DE1954891A1 DE1954891A1 DE19691954891 DE1954891A DE1954891A1 DE 1954891 A1 DE1954891 A1 DE 1954891A1 DE 19691954891 DE19691954891 DE 19691954891 DE 1954891 A DE1954891 A DE 1954891A DE 1954891 A1 DE1954891 A1 DE 1954891A1
- Authority
- DE
- Germany
- Prior art keywords
- cannula tube
- plastic attachment
- plastic
- corrugation
- bore
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/74—Joining plastics material to non-plastics material
-
- 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
- A61M25/00—Catheters; Hollow probes
- A61M25/0009—Making of catheters or other medical or surgical tubes
- A61M25/0014—Connecting a tube to a hub
-
- 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
- A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
- A61M5/343—Connection of needle cannula to needle hub, or directly to syringe nozzle without a needle hub
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0078—Measures or configurations for obtaining anchoring effects in the contact areas between layers
- B29C37/0082—Mechanical anchoring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4895—Solvent bonding, i.e. the surfaces of the parts to be joined being treated with solvents, swelling or softening agents, without adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
- B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
- B29C66/7316—Surface properties
- B29C66/73161—Roughness or rugosity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/022—Mechanical pre-treatments, e.g. reshaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/74—Joining plastics material to non-plastics material
- B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
- B29L2031/7544—Injection needles, syringes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Vascular Medicine (AREA)
- Biophysics (AREA)
- Pulmonology (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Description
Anmelder:Applicant:
VEB Ihjekta Klingenthal
965 Klingenthal VEB Ihjekta Klingenthal
965 Klingenthal
Verfahren zur Herstellung von Injektionskanülen mit PlastansatzProcess for the production of injection cannulas with a plastic attachment
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von Injektionskanülen mit Plastansatz, in welchem das Kanülenrohr eingesetzt und unverschiebbar befestigt ist»The invention relates to a method for producing injection cannulas with plastic attachment in which the cannula tube is inserted and fixed in place »
Es ist bekannt, das Kanülenrohr mit einem vorgefertigten Plastansatz in der Art zu verbinden, daß die Spitze des Plastansatzes mit einer Bohrung versehen ist, deren Durchmesser größer als der Außendurch— messer des Kanülenrohres ist« Nach dem Einsetzen des Kanülenrohres in die Bohrung entsteht ein ringförmiger Zwischenraum zwischen der Wandung des Kanülenrohres und der Wandung der Bohrung, Dieser Zwischenraum wird mit einem Kleber, Kitt oder anderen Verbindungsmittel ausgefüllt, so daß eine stoffschlüssige Verbindung zwischen Kanülenrohr und Plastansatz entsteht.It is known that the cannula tube with a prefabricated plastic attachment to be connected in such a way that the tip of the plastic attachment is provided with a hole, the diameter of which is larger than the outer diameter. The diameter of the cannula tube is «After the cannula tube has been inserted into the bore, an annular gap is created between the Wall of the cannula tube and the wall of the bore, this space is covered with an adhesive, putty or other connecting means filled in, so that a cohesive connection between the cannula tube and the plastic attachment is created.
Dieses Verfahren hat den Nachteil, daß bei loser Passung zwischen Kanülenrohr und Plastansatz kein ausreichend fester Sitz gewährleistet ist, während bei Verwendung einer genau passenden Bohrung die im voraus polierte Oberfläche der Kanüle beschädigt werden kann und außerdem infolge einer relativ dünnen Schicht des Verbindungsmittels ebenfalls kein ausreichend fester Sitz gewährleistet ist« This method has the disadvantage that if there is a loose fit between the cannula tube and the plastic attachment, it does not ensure a sufficiently tight fit while using a precisely fitting bore can damage the pre-polished surface of the cannula and in addition, due to a relatively thin layer of the lanyard, a sufficiently tight fit is also not guaranteed «
Des weiteren besteht die Gefahr, daß beim Einschieben des Kanülenrohres in die Bohrung des Plastansatzes, das Bindemittel, welches z.B. zuvor auf das Kanülenrohr aufgetragen worden ist, teilweise abgeschoben wird, was zu einem Verstopfen des Kanülenrohres führen kann, und daß keine ausreichend feste Verbindung erreichtThere is also the risk that when the cannula tube is pushed in into the bore of the plastic attachment, the binding agent, which e.g. has previously been applied to the cannula tube, partially is pushed off, which lead to clogging of the cannula tube can, and that does not achieve a sufficiently strong connection
-2--2-
10981B/180310981B / 1803
Es ist ferner ein Verfahren zum Befestigen eines Kanülenrohres in einem Plastansatz bekannt, bei dem das Ende des Kanülenrohres mit einem Ansatz versehen sein muß, der auf den Kegel einer Injektionsspritze aufgesetzt werden kann. Das Kanülenrohr wird in eine Spritzgußform eingelegt, und mit Hilfe eines plastifizierten Kunststoffes wird der Ansatz an das Ende des Kanülenrohres angespritzt.It is also a method of attaching a cannula tube known in a plastic approach, in which the end of the cannula tube must be provided with an approach that is on the cone of a Injection syringe can be attached. The cannula tube is placed in an injection mold, and with the help of a plasticized one Plastic, the approach is injected onto the end of the cannula tube.
Dieses Verfahren bringt insofern Schwierigkeiten mit sich, indem die Spritzgußform das Kanülenende fest umschließen muß, damit ein Eindringen des Kunststoffes in das Kanülenrohr vermieden wird«This method brings difficulties insofar as the injection mold must firmly enclose the cannula end so that a Penetration of the plastic into the cannula tube is avoided «
Weiterhin muß das Kanülenrohr an seiner empfindlichen Spitze durch ein Widerlager gegen die in Längsrichtung des Kanülenrohres wirkenden Druckkräfte eines Abdichtorgans und des Spritzdruckes abgestützt werden, Das hat die Möglichkeit der Beschädigung des Kanülenrohres und insbesondere der bereits vor dem Spritzvorgang angeschliffenen Spitze zur Folge»Furthermore, the cannula tube must pass through at its sensitive tip an abutment against the acting in the longitudinal direction of the cannula tube Pressure forces of a sealing element and the injection pressure are supported, this has the possibility of damaging the cannula tube and in particular the tip that has already been ground before the spraying process »
Soll dieser Mangel durch Einsetzen eines angeschliffenen Kanülenrohres, welches erst nach dem Einspritzvorgang angeschliffen wird, behoben werden, so erfordert das einen erheblichen Mehraufwand an Schleifkapazität, da die Rohre, bedingt durch die Plastansätze beim Schleifen nicht mehr unmittelbar aneinandergelegt werden können· Dadurch kann während eines Schleifzyklusses nur noch ein Bruchteil der Rohre geschliffen werden»If this defect is to be solved by inserting a sharpened cannula tube, which is only sanded after the injection process, can be eliminated, this requires a considerable amount of additional work Grinding capacity, as the pipes, due to the plastic attachments can no longer be placed directly next to each other during grinding · As a result, only a fraction of the the pipes are ground »
Ein weiteres Verfahren zur Herstellung von Kanülen besteht bereits in der Art, daß das Ende des Kanülenrohres in eine Bohrung des Plastansatzes eingeführt und anschließend eine Metallhülse über die Spitze des Plastansatzes geschoben wird. Daraufhin wird der lichte Querschnitt der Metallhülse durch deren Verformung derart verringert, daß die Ansatzspitze radial zusammengequetscht und gegen die Wandung des Kanülenrohres gepreßt wird. Dieses Verfahren erfordert einen relativ großen Aufwand, da zum Verbinden des Kanülenrohres mit dem Plastansatz noch ein zusätzliches Verbindungselement in Porm der Metallhülse erforderlich ist.Another method for manufacturing cannulas already exists in such a way that the end of the cannula tube is inserted into a bore in the plastic attachment and then a metal sleeve over the tip of the plastic attachment is pushed. The clear cross section of the metal sleeve is then deformed in this way reduces that the neck tip is squeezed together radially and is pressed against the wall of the cannula tube. This method requires a relatively large amount of effort, since it is used to connect the cannula tube with the plastic attachment an additional connecting element in the form of the metal sleeve is required.
109816/1803109816/1803
Außerdem bestellt die Gefahr, daß durch Zusanunenquetschen der Metallhülse unter Zuhilfenahme entsprechender Werkzeuge eine Verformung des Kanülenrohres auftritt, und der anfänglich lichte Querschnitt im Kanülenrohr in seiner Größe nicht mehr gewährleistet ist· Burch die relativ hohe Beanspruchung des Plastmaterials ist die Gefahr der· Spannungsrißbildung nicht auszuschliessen. In addition, there is a risk that by squeezing the metal sleeve with the aid of appropriate tools, a Deformation of the cannula tube occurs, and the initially clear Cross-section in the cannula tube is no longer guaranteed in terms of its size is due to the relatively high stress on the plastic material the risk of stress cracking cannot be ruled out.
Ein weiterhin bekanntes Verfahren beruht auf dem Anschmelzen des Plastansatzes auf der Außenwand des Kanülenrohres· Dieses Anschmelzen wird durch Erhitzen mittels Induktionsspule erreicht. Dieses Verfahren hat den Nachteil, daß beim nachträglichen Erwärmen des Kanülenrohres, welches sich bereits in dem Plastansatz befindet eine Haftung zwischen beiden Teilen nicht erzielt wird, solange glatte Rohre, wie sie beim Rohrziehen entstehen, verwandet werden. Außerdem bedeutet die nachträgliche Erwärmung des Plastansatzes eine Qualitätsminderung, da die mechanischen Eigenschaften dadurch herabgemindert werden. Außerdem ist ein relativ großer Zeitaufwand für die Herstellung der Verbindung erforderlich·Another known method is based on melting the plastic attachment onto the outer wall of the cannula tube Melting is achieved by heating with an induction coil. This method has the disadvantage that when the cannula tube, which is already in the plastic attachment, is subsequently heated If there is no adhesion between the two parts, as long as smooth pipes, such as those produced by pipe drawing, be used. In addition, the subsequent heating of the plastic approach means a reduction in quality, since the mechanical Properties are thereby reduced. In addition, it takes a relatively long time to establish the connection necessary·
Weiterhin ist ein Verfahren bekannt, bei dem das Kanülenrohr an seinem im Plastansatz zu befestigenden Ende mit einem angefauchten Flansch versehen und der Ansatz durch Umspritzen des Kanülenrohres hergestellt ist« Dieser Ansatz ist zur Erreichung eines genügenden Haltes des Flansches in dem Kanülenrohr an seinem hinteren Ende verdickt ausgeführt. Es wird zwar bei Anwendung dieses Verfahrens eine gute mechanische Verankerung beider Teile erreicht, nachteilig ist Jedoch, daß ein zusätzlicher Arbeitsgang in Form des Anstauchens erforderlich wird. Außerdem können durch den Anspritzvorgang, wie bereits beschrieben, das Kanülenrohr und die angeschliffene Spitze beschädigt werden.Furthermore, a method is known in which the cannula tube has a flared end at its end to be fastened in the plastic attachment The flange is provided and the attachment is produced by injection molding around the cannula tube. «This approach is sufficient to achieve a Holding the flange in the cannula tube is carried out thickened at its rear end. It will while using this procedure A good mechanical anchoring of both parts is achieved, but it is disadvantageous that an additional operation in the form of the Upsetting is required. In addition, through the injection process, as already described, the cannula tube and the sharpened tip can be damaged.
Letztenendes ist ein Verfahren bekannt, bei dem der feste Sitz des Kanülenrohres im Plastansatz erreicht wird, indem das Kanülen-Ultimately, a method is known in which the tight fit of the cannula tube in the plastic attachment is achieved by the cannula
10 9 8 16/180310 9 8 16/1803
rohr mit Übermaß in die Bohrung des Ansatzes eingeschoben wird (Preßsitz). Dabei ist der Teil des Kanülenrohres, der im Plastansatz verbleibt, mit einer mechanischen Aufrauhung versehen, um eine noch bessere Verankerung des Kanülenrohres im Plastansatz zu erreichen.tube is pushed into the bore of the neck with oversize (Press fit). The part of the cannula tube that remains in the plastic attachment is provided with a mechanical roughening in order to to achieve an even better anchoring of the cannula tube in the plastic attachment.
Dieses Verfahren hat den Nachteil, daß beim Durchschieben des angeschliffenen Kanülenrohres Plastmaterial von der Wandung der Innenbohrung des Plastansatzes abgetragen wird und sich im Kanülenrohr festsetzt. Weiterhin kommt es im Laufe der Zeit zu einem Abbau des Preßsitzes, bedingt durch den kalten Fluß des Plastinaterials. Der anfänglich feste Sitz des Kanülenrohres im Plastansatz ist nicht mehr gewährleistet. Ebenfalls zu bemängeln ist auch hier die Gefahr der Spannungsrißbildung im Plastansatz·This method has the disadvantage that when pushing through the sanded cannula tube plastic material is removed from the wall of the inner bore of the plastic attachment and is in the cannula tube sets. Furthermore, the press fit deteriorates over time due to the cold flow of the plastin material. The initially firm fit of the cannula tube in the plastic attachment is no longer guaranteed. Is also to be criticized here too the risk of stress cracking in the plastic attachment
Es ist Zweck der Erfindung, ein Verfahren zur Herstellung einer Verbindung zwischen Kanülenrohr und Plastansatz zu entwickeln, welches die Nachteile der bereits bekannten Verfahren ausschaltet und eine rationelle Fertigung der Kanülen mit einwandfreiem Sitz ermöglicht.It is the purpose of the invention to develop a method for producing a connection between the cannula tube and the plastic attachment, which eliminates the disadvantages of the already known methods and an efficient production of the cannulas with a perfect fit enables.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, welches das Befestigen des Kanülenrohres in dem Plastansatz durch eine formschlüssige Verbindung ohne Wärmeeinfl"£Lsse und ohne zusätzliche Arbeitsgänge ermöglicht, wobei ohne besonderen Aufwand eine Vollautomatisierung des Verfahrens gegeben ist.The invention is based on the object of creating a method which the fastening of the cannula tube in the plastic attachment by a form-fitting connection without the influence of heat and without additional Allows work steps, with a full automation of the process is given without any special effort.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß unmittelbar vor Einschieben des Kanülenrohres in den Plastansatz auf den mit einer Riffelung versehenen Bereich des Kanülenrohres ein Chemikalienzusatz aufgebracht und sodann das Kanülenrohr in eine Bohrung des Plastansatzes geschoben wird, so daß die durch die, einen Preßsitz herrufende Riffelung zunächst überwiegend kraftschlüssige Verbindung infolge der vorübergehend plastisch verformungsfähig gewordenen Wandung der Bohrung des Plastansatzes, hervorgerufen durch die Einwirkung des Chemikalienzusatzes, inAccording to the invention the object is achieved in that directly before inserting the cannula tube into the plastic attachment on the area of the cannula tube provided with a corrugation Chemical additive applied and then the cannula tube is pushed into a hole in the plastic attachment so that the through the, a press fit herrufenden corrugation initially predominantly frictional Connection as a result of the wall of the bore of the plastic attachment that has temporarily become plastically deformable, caused by the action of the chemical additive, in
109816/1803109816/1803
eine formschlüssige Verbindung umgewandelt wird und so beide Teile nach Verdunsten des Chemikalienzusatzes unverschiebbar miteinander verbunden sind, wobei der Chemiekalienzusatz aus einer über dem Einschubende des Plastansatzes angeordneten Dosiereinrichtung automatisch zugeteilt und auf den Bereich des Kanülenrohres konzentriert wird, auf dem sich die Riffelung befindet, deren Durchmesser durch das Anbringen der Riffelung etwas stärker als der Durchmesser der Bohrung ist·a form-fitting connection is converted and so both parts cannot be moved after the chemical additive has evaporated are connected to one another, the chemical additive from a arranged over the insertion end of the plastic attachment Dosing device is automatically allocated and concentrated on the area of the cannula tube on which the corrugation is located the diameter of which is slightly larger than the diameter of the hole due to the corrugation being applied
Das erfindungsgemäße Verfahren hat den Vorteil, daß mit einem wesentlich geringeren technischen und zeitlichen Aufwand der gleiche Effekt wie beim Anspritzen des Plastansatzes an das Kanülenrohr erzielt wird, so daß bei rationellster Fertigung ein einwandfreier Sitz des Kanülenrohres in dem Plastansatz gewährleistet ist. Außerdem kann ein Verstopfen des Kanülenrohres sowie ein Beschädigen der Spitze und der Oberfläche desselben nicht eintreten· Der gesamte Vorgang kann ohne besonderen Aufwand vollautomatisiert werden·The inventive method has the advantage that with a significantly lower technical and time expenditure the same effect is achieved as when the plastic attachment is injected onto the cannula tube, so that with the most efficient production a perfect fit of the cannula tube in the plastic attachment is guaranteed. In addition, clogging of the cannula tube can occur as well as damage to the tip and the surface of the same do not occur · The entire process can be carried out without special Effort can be fully automated
Die Erfindung soll anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert werden.The invention will be explained in more detail with reference to an embodiment shown in the drawing.
Es zeigen:Show it:
Fig, 1 Das Kanülenrohr und den Plastansatz vor Beginn des Einschiebens,Fig, 1 The cannula tube and the plastic attachment before the start of insertion,
Pig. 2 die fertige KanülePig. 2 the finished cannula
Das Kanülenrohr 1 besteht vor dem BefestigungsVorgang aus einem planpolierten Rohr, welches mit dem erforderlichen Anschliff versehen ist. An dem, dem Anschliff gegenüberliegenden Ende befindet sich eine Riffelung 2, wodruch dieser Bereich des Kanülenrohres etwas stärker als der Durchmesser einer Bohrung 3 ist, die sich in einem Plastansatz 4 befindet. Der Plastansatz besitzt außerdemThe cannula tube 1 consists of one before the fastening process Polished tube, which is provided with the required bevel. At the end opposite the bevel a corrugation 2, whereby this area of the cannula tube is somewhat thicker than the diameter of a bore 3, which is in a plastic attachment 4 is located. The plastic approach also has
109816/1803109816/1803
einen Innenkonus 5. Der Durchmesser des Kanülenrohres 1 ist vorzugsweise identisch mit dem Durchmesser der Bohrung 3» so daß beim Aufeinanderschieben ein Gleitsitz entsteht. Durch das Anbringen der Riffelung 2 erhält dieser Bereich des Kaniilenrohres 1 einen größeren Durchmesser als der glatte Bereich und demzufolge auch als die Bohrung 3· Beim Herstellen der Verbindung zwischen dem Kanülenrohr 1 und dem Pl aa tans atz 4 wird das Kanülenrohr 1 soweit in den Plastansatz 4 geschoben, daß die Riffelung 2 gerade noch aus dem Konus 5 hervorsteht. Bevor das Kanülenrohr 1 weiter in die Bohrung 3 des Plastansatzes 4 geschoben wird, wird auf die Riffelung 2. ein Chemikalienzusatz 6 gebracht, welcher aus einer an der erforderlichen Stelle oberhalb des Kanülenrohres 1 angeordneten Dosiereinrichtung 7 automatisch zugeteilt wird. Sodann wird das Kanülenrohr 1 vollständig in die Bohrung 3 eingeschoben· Der jetzt auf der Riffelung 2 befindliche Chemikalienzusatz 6 gibt der Innenwandung der Bohrung 3 eine plastische Verformungsfähigkeit· In dem nun, durch den Preßsitz bedingt, das plastisch verformungsfähige Material in die Vertiefungen der Riffelung 2 eindringt, wird dieser aufgehoben. Durch Verdunstung wird der Chemikalienzusatz 6 aus der Verbindung ausgeschieden. Aus der vorübergehend kraftschlüssigen Verbindung ist somit eine formschlüssige Verbindung geworden, die einen ausreichend festen und dichten Sitz des Kaniilenrohres 1 im Plastansatz 4 garantiert, *an inner cone 5. The diameter of the cannula tube 1 is preferably identical to the diameter of the bore 3 »so that a sliding fit is created when they are pushed onto one another. By attaching the corrugation 2, this area of the cannula tube 1 has a larger diameter than the smooth area and consequently also than the bore 3. When the connection between the cannula tube 1 and the plate 4 is made, the cannula tube 1 is so far into the plastic attachment 4 pushed so that the corrugation 2 just protrudes from the cone 5. Before the cannula tube 1 is pushed further into the bore 3 of the plastic attachment 4, a chemical additive 6 is applied to the corrugation 2 , which is automatically dispensed from a metering device 7 arranged at the required point above the cannula tube 1. Then the cannula tube 1 is pushed completely into the bore 3 The chemical additive 6 now on the corrugation 2 gives the inner wall of the bore 3 a plastic deformability In that now, due to the press fit, the plastically deformable material into the depressions of the corrugation 2 penetrates, it is canceled. The chemical additive 6 is excreted from the compound by evaporation. The temporary non-positive connection has thus become a form-fitting connection that guarantees a sufficiently firm and tight fit of the cannula tube 1 in the plastic attachment 4, *
109816/1803109816/1803
Claims (4)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD13704568 | 1968-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1954891A1 true DE1954891A1 (en) | 1971-04-15 |
Family
ID=5480771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19691954891 Pending DE1954891A1 (en) | 1968-12-30 | 1969-10-31 | Process for the production of injection needles with a plastic attachment |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE742571A (en) |
| DE (1) | DE1954891A1 (en) |
| DK (1) | DK120039B (en) |
| FR (1) | FR2027303A1 (en) |
| GB (1) | GB1262780A (en) |
| SE (1) | SE344555B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3122149A1 (en) * | 1980-06-06 | 1982-08-05 | Deutsche Solvay-Werke Gmbh, 5650 Solingen | Process for joining thermoplastic materials and metals |
| DE3938533A1 (en) * | 1989-11-21 | 1991-05-23 | Rainer M Lutz | Hand-rinsing water tap with sequential automatic control - responds to proximity of hands with timed spray of cleansing agent between outflows of warm water |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4512947A (en) * | 1983-05-05 | 1985-04-23 | Charles Wyle Engineering Corporation | Method and apparatus for applying solvent to tubing, other cylindrical objects or other flexible material |
| WO2001091826A2 (en) * | 2000-05-26 | 2001-12-06 | Medical Safety Products, Inc. | Cannula assembly for medical applications and method of manufacture |
| KR200487150Y1 (en) * | 2018-01-23 | 2018-08-13 | 코박메드 주식회사 | Cannula |
-
1969
- 1969-10-29 GB GB53002/69A patent/GB1262780A/en not_active Expired
- 1969-10-31 DE DE19691954891 patent/DE1954891A1/en active Pending
- 1969-11-21 SE SE16014/69A patent/SE344555B/xx unknown
- 1969-11-27 DK DK628969AA patent/DK120039B/en unknown
- 1969-12-03 FR FR6941718A patent/FR2027303A1/fr not_active Withdrawn
- 1969-12-03 BE BE742571D patent/BE742571A/xx unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3122149A1 (en) * | 1980-06-06 | 1982-08-05 | Deutsche Solvay-Werke Gmbh, 5650 Solingen | Process for joining thermoplastic materials and metals |
| DE3938533A1 (en) * | 1989-11-21 | 1991-05-23 | Rainer M Lutz | Hand-rinsing water tap with sequential automatic control - responds to proximity of hands with timed spray of cleansing agent between outflows of warm water |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2027303A1 (en) | 1970-09-25 |
| GB1262780A (en) | 1972-02-09 |
| SE344555B (en) | 1972-04-24 |
| DK120039B (en) | 1971-03-29 |
| BE742571A (en) | 1970-05-14 |
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