DE19831721A1 - Method for producing cylindrical lattice structures, in particular, for stents by laser beam cutting of thin-walled tubes, with an additional tube inserted into the tube to be cut and removed from it after completion of the cutting process - Google Patents

Method for producing cylindrical lattice structures, in particular, for stents by laser beam cutting of thin-walled tubes, with an additional tube inserted into the tube to be cut and removed from it after completion of the cutting process

Info

Publication number
DE19831721A1
DE19831721A1 DE1998131721 DE19831721A DE19831721A1 DE 19831721 A1 DE19831721 A1 DE 19831721A1 DE 1998131721 DE1998131721 DE 1998131721 DE 19831721 A DE19831721 A DE 19831721A DE 19831721 A1 DE19831721 A1 DE 19831721A1
Authority
DE
Germany
Prior art keywords
tube
pipe
additional
machined
laser beam
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Withdrawn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
DE1998131721
Other languages
German (de)
Inventor
Clemens Meyer-Kobbe
Philippe Poncin
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.)
MEYER KOBBE CLEMENS
Original Assignee
MEYER KOBBE CLEMENS
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 MEYER KOBBE CLEMENS filed Critical MEYER KOBBE CLEMENS
Priority to DE1998131721 priority Critical patent/DE19831721A1/en
Publication of DE19831721A1 publication Critical patent/DE19831721A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/18—Working by laser beam, e.g. welding, cutting or boring using absorbing layers on the workpiece, e.g. for marking or protecting purposes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2240/00—Manufacturing or designing of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2240/001—Designing or manufacturing processes

Abstract

An additional tube is inserted into the tube to be cut. The outer tube of the resulting compound tube is cut by means of a laser beam. The inner tube is removed after completion of the cutting process, leaving the outer tube in the form of a desired cylindrical lattice structure. Preferred Features: The additional tube is inserted into outer tube without gap. The inner tube consists of a material which differs from that of the outer tube. For easier removal, the inner tube has a smaller wall thickness than the outer tube. The inner tube is removed by chemical and/or mechanical means. The inner tube is removed by shot blasting with an aggressive material. Alternatively it is dissolved by acids. The inner tube has a higher elasticity than the outer tube. For removal, it is first radially expanded and then left to contract. Alternatively the inner tube consists of a brittle material which is broken into pieces when expanded. The inside diameter of the outer tube varies from 1 to 8 mm, while the tube wall thickness varies from 50 mu m to 300 mu m. As an alternative to the inner tube, the outer tube can be filled with a synthetic material. Some of this material is evaporated by the laser beam during the cutting process, leaving the rest to be removed by chemical or mechanical means.

Description

Die Erfindung betrifft ein Verfahren zur Herstel­ lung von zylindrischen Gitterstrukturen aus dünnwandi­ gen Rohren, insbesondere zur Herstellung von Stents, mittels Laserstrahlschneiden.The invention relates to a method of manufacture development of cylindrical lattice structures made of thin walls tubes, especially for the production of stents, by means of laser beam cutting.

Beim Laserstrahlschneiden von Strukturen in dünn­ wandigen Rohren mit kleinen Innendurchmessern, bei­ spielsweise zur Herstellung von Stents, treten vor al­ lem zwei Probleme auf:
When laser-cutting structures in thin-walled tubes with small inside diameters, for example for the production of stents, two problems occur in particular:

  • 1. Häufig wird die dem Laserstrahlschnitt gegen­ überliegende Rohrinnenseite durch den Laser­ strahl beschädigt; es entstehen sogenannte "An­ schußstellen".1. Often the laser beam cut is opposed overlying tube inside by the laser beam damaged; so-called "An firing points ".
  • 2. Die Schnittkanten weisen insbesondere bei schwierig zu bearbeitenden Materialien unzuläs­ sige Grate auf.2. The cut edges have in particular difficult to process materials burrs.

Die Aufgabe der vorliegenden Erfindung besteht darin, ein Verfahren zur Herstellung von zylindrischen Gitterstrukturen aus dünnwandigen Rohren, insbesondere zur Herstellung von Stents, mittels Laserstrahlschnei­ den so auszubilden, daß die Gefahr einer Beschädigung der gegenüberliegenden Rohrinnenseite und des Auftre­ tens von Graten an den Schnittkanten vermieden ist. The object of the present invention is therein, a method of manufacturing cylindrical Lattice structures made of thin-walled tubes, in particular for the production of stents by means of laser beam cutting to train so that the risk of damage the opposite inside of the tube and the step burrs on the cut edges are avoided.  

Diese Aufgabe wird durch die Erfindung gemäß An­ spruch 1 gelöst.This object is achieved by the invention according to An spell 1 solved.

Vorteilhafte und zweckmäßige Weiterbildungen der Aufgabenlösung sind in den Unteransprüchen angegeben.Advantageous and expedient further developments of Task solutions are specified in the subclaims.

Bei dem erfindungsgemäßen Verfahren wird in ein zu bearbeitendes und zu nutzendes Rohr ein Zusatzrohr in­ nen eingezogen, so daß ein Doppelrohr entsteht, das dann mittels Laserstrahlschneiden zur Herstellung von zylindrischen Gitterstrukturen im äußeren Rohr bearbei­ tet wird. Das Zusatzrohr besteht vorzugsweise aus einem anderen Werkstoff als das zu bearbeitende Rohr und liegt eng an der Innenwandung des äußeren zu bearbei­ tenden Rohres an. Das innere Zusatzrohr besteht aus einem solchen Material oder ist so ausgebildet, daß es nach dem Laserstrahlschneiden chemisch oder mechanisch leicht entfernt werden kann, ohne daß dabei das äußere Rohr beschädigt wird.In the method according to the invention, a pipe to be processed and used an additional pipe in NEN pulled so that a double tube is formed, the then using laser beam cutting to produce cylindrical lattice structures in the outer tube is tested. The additional pipe preferably consists of a different material than the pipe to be machined and lies close to the inner wall of the outer one pipe. The inner additional pipe consists of such a material or is designed so that it chemically or mechanically after laser cutting can be easily removed without detracting from the outside Pipe is damaged.

Vorzugsweise wird ein chemisches auf Säuren basie­ rendes Verfahren zum Entfernen des inneren Zusatzrohres angewendet.Preferably a chemical is acid based rendes procedure for removing the inner additional tube applied.

Beim Laserstrahlschneiden des durch das Einziehen des Zusatzrohres gebildeten Doppelrohres braucht auf Beschädigungen der Rohrinnenseite nicht mehr Rücksicht genommen zu werden, da das innere Zusatzrohr nach der Bearbeitung entfernt bzw. herausgelöst wird. Der Laser­ prozeß kann folglich unabhängig von dieser sonst schwerwiegenden Einschränkung eingestellt werden und ausschließlich auf andere Qualitätskriterien hin opti­ miert werden. So ist es z. B. möglich mit höheren La­ serstrahlleistungen zu schneiden, um eine Gratbildung zu minimieren. Sollten sich Grate ausbilden, so ent­ steht dieser Grat am inneren Zusatzrohr, und zwar an der Strahlaustrittsseite an der inneren Kante des Zu­ satzrohres. Mit der Entfernung bzw. Beseitigung des Zusatzrohres wird auch gleichzeitig der Grat mit ent­ fernt.When cutting the laser beam by pulling it in of the additional tube formed double needs Damage to the inside of the pipe is no longer considered to be taken, since the inner additional pipe after the Processing is removed or detached. The laser process can therefore be independent of this otherwise serious restriction can be set and opti only for other quality criteria be lubricated. So it is z. B. possible with higher La to cut the beam power to form a burr to minimize. Should burrs develop, ent is this ridge on the inner additional pipe, and that the beam exit side on the inner edge of the Zu set tube. With the removal or elimination of the Additional tube is also the ridge ent distant.

Nach der Entfernung des Zusatzrohres bleibt das äußere Rohr als zylindrische Gitterstruktur.After removing the additional pipe, that remains  outer tube as a cylindrical lattice structure.

Gemäß einer weiteren Lösung der Aufgabe nach An­ spruch 12 wird das zu bearbeitende Rohr vor der Behand­ lung mit einem synthetischen Material, beispielsweise Gummi, verfüllt, welches sich beim Laserstrahlschneiden des Rohres durch Beaufschlagung mit dem Laserstrahl explosionsartig auflöst und dabei entstandene Grate am Rohr mit abreißt. Eventuell verbleibende Reste des syn­ thetischen Materials können leicht mechanisch oder che­ misch entfernt werden.According to a further solution of the task according to An Proverb 12 is the pipe to be processed before the treatment with a synthetic material, for example Rubber, filled, which is used in laser beam cutting of the tube by exposure to the laser beam explosively dissolves and ridges are formed on it Tear off pipe. Any remaining residues of the syn thetic material can easily be mechanically or che can be removed mix.

Ein weiterer Vorteil des erfindungsgemäßen Verfah­ rens besteht darin, daß bei sehr dünnwandigen, zu be­ arbeitenden Rohren oder bei Rohren mit geringer Festig­ keit durch das Einziehen des Zusatzrohres oder durch das Verfüllen mit synthetischem Material insgesamt eine höhere Rohrstabilität erzielt wird. In einigen Fällen wird hierdurch erst eine Rohrhandhabung ohne Beschädi­ gungen und eine Bearbeitung des Rohres möglich. Die größere Stabilität erlaubt eine höhere Bearbeitungs­ präzision.Another advantage of the inventive method rens is that with very thin-walled, to be working pipes or pipes with low strength speed by pulling in the additional pipe or by the filling with synthetic material a total of one higher pipe stability is achieved. In some cases is only a pipe handling without damage conditions and processing of the pipe possible. The greater stability allows higher machining precision.

Claims (12)

1. Verfahren zur Herstellung von zylindrischen Gitter­ strukturen aus dünnwandigen Rohren, insbesondere zur Herstellung von Stents, mittels Laserstrahlschneiden, dadurch gekennzeichnet, daß
  • 1. in das zu bearbeitende bzw. zu schneidende Rohr ein Zusatzrohr eingezogen wird,
  • 2. das zu bearbeitende äußere Rohr des Doppelrohres, das aus dem zu bearbeitenden Rohr und Zusatzrohr besteht, der Bearbeitung mittels Laserstrahlung unterzogen wird und
  • 3. nach erfolgter Bearbeitung bzw. nach Beendigung des Schneidvorganges das Zusatzrohr entfernt wird, so daß das äußere Rohr als fertige lasergeschnit­ tene zylindrische Gitterstruktur verbleibt.
1. A method for producing cylindrical lattice structures from thin-walled tubes, in particular for the production of stents, by means of laser beam cutting, characterized in that
  • 1. an additional pipe is drawn into the pipe to be processed or cut,
  • 2. the outer tube to be machined of the double tube, which consists of the tube to be machined and the additional tube, is subjected to machining by means of laser radiation and
  • 3. after processing or after completion of the cutting process, the additional tube is removed, so that the outer tube remains as a finished laser-cut cylindrical grid structure.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das innere Zusatzrohr eng, d. h. ohne Spalt, an der Innenwandung des zu bearbeitenden Rohres anliegt.2. The method according to claim 1, characterized in that that the inner auxiliary tube is tight, d. H. without a gap at the Inner wall of the pipe to be machined. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekenn­ zeichnet, daß das innere Zusatzrohr aus einem anderen Material besteht als das zu bearbeitende Rohr. 3. The method according to claim 1 or 2, characterized records that the inner auxiliary tube from another Material exists as the pipe to be machined.   4. Verfahren nach einem der Ansprüche 1-3, dadurch ge­ kennzeichnet, daß das innere Zusatzrohr zur leichteren Entfernung eine geringere Wandstärke aufweist als das äußere zu bearbeitende Rohr.4. The method according to any one of claims 1-3, characterized ge indicates that the inner additional pipe for lighter Distance has a smaller wall thickness than that outer tube to be machined. 5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das innere Zusatzrohr che­ misch und/oder mechanisch aus dem äußeren zu bearbei­ tenden Rohr entfernt oder herausgelöst wird.5. The method according to any one of the preceding claims, characterized in that the inner additional pipe che can be mixed and / or mechanically processed from the outside pipe is removed or removed. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß das innere Zusatzrohr durch Strahlen mit aggressi­ vem Strahlgut mechanisch entfernt wird.6. The method according to claim 5, characterized in that the inner additional pipe by blasting with aggressi v the blasting material is removed mechanically. 7. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß das innere Zusatzrohr mittels Säuren chemisch her­ ausgelöst wird.7. The method according to claim 5, characterized in that that the inner additional pipe is chemically produced by means of acids is triggered. 8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das innere Zusatzrohr eine höhere Elastizität als das äußere zu bearbeitende Rohr aufweist und zum Entfernen zunächst radial gedehnt wird und danach die Dehnung wieder aufgehoben wird, so daß sich das Zusatzrohr elastisch zusammenzieht und sich so vom äußeren bearbeiteten Rohr lösen läßt.8. The method according to any one of the preceding claims, characterized in that the inner additional tube a higher elasticity than the outer tube to be machined has and is first stretched radially to remove and then the stretch is released so that the additional tube contracts elastically and so can be detached from the outer machined pipe. 9. Verfahren nach einem der Ansprüche 1-6, dadurch ge­ kennzeichnet, daß das innere Zusatzrohr eine hohe Sprö­ digkeit aufweist und zum Entfernen aus dem bearbeiteten Rohr durch Dehnung in Stücke gebrochen und aus dem äu­ ßeren bearbeiteten Rohr entfernt wird.9. The method according to any one of claims 1-6, characterized ge indicates that the inner additional tube has a high brittle and removal from the machined Tube broken into pieces by expansion and out of the outside outer machined pipe is removed. 10. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Innendurchmesser des zu bearbeitenden Rohres 1 mm-8 mm beträgt.10. The method according to any one of the preceding claims, characterized in that the inside diameter of the processing tube is 1 mm-8 mm. 11. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Wandstärke des zu be­ arbeitenden Rohres 50 µm-300 µm beträgt.11. The method according to any one of the preceding claims,  characterized in that the wall thickness of the be working tube is 50 microns-300 microns. 12. Verfahren zur Herstellung von zylindrischen Gitter­ strukturen aus dünnwandigen Rohren, insbesondere zur Herstellung von Stents, mittels Laserstrahlschneiden, dadurch gekennzeichnet, daß das zu bearbeitende bzw. zu schneidende Rohr zunächst mit einem synthetischen Mate­ rial verfüllt wird und danach der Laserstrahlbearbei­ tung unterzogen wird, daß das synthetische Füllmaterial mit dem Laserstrahl beaufschlagt wird zum Verdampfen des Füllmaterials und daß eventuell verbleibende Reste des Füllmaterials mechanisch oder chemisch entfernt werden.12. Method of making cylindrical grids structures made of thin-walled tubes, in particular for Manufacture of stents by means of laser beam cutting, characterized in that the to be processed or cutting tube first with a synthetic mate rial is filled and then the laser beam processing tion is subjected to the synthetic filler the laser beam is applied to vaporize of the filling material and that any remaining residues the filler removed mechanically or chemically become.
DE1998131721 1998-07-15 1998-07-15 Method for producing cylindrical lattice structures, in particular, for stents by laser beam cutting of thin-walled tubes, with an additional tube inserted into the tube to be cut and removed from it after completion of the cutting process Withdrawn DE19831721A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1998131721 DE19831721A1 (en) 1998-07-15 1998-07-15 Method for producing cylindrical lattice structures, in particular, for stents by laser beam cutting of thin-walled tubes, with an additional tube inserted into the tube to be cut and removed from it after completion of the cutting process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1998131721 DE19831721A1 (en) 1998-07-15 1998-07-15 Method for producing cylindrical lattice structures, in particular, for stents by laser beam cutting of thin-walled tubes, with an additional tube inserted into the tube to be cut and removed from it after completion of the cutting process

Publications (1)

Publication Number Publication Date
DE19831721A1 true DE19831721A1 (en) 2000-01-20

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DE1998131721 Withdrawn DE19831721A1 (en) 1998-07-15 1998-07-15 Method for producing cylindrical lattice structures, in particular, for stents by laser beam cutting of thin-walled tubes, with an additional tube inserted into the tube to be cut and removed from it after completion of the cutting process

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1266637A1 (en) * 2001-06-11 2002-12-18 Cordis Neurovascular, Inc. Method of manufacturing small profile medical devices
WO2008147590A1 (en) * 2007-05-31 2008-12-04 Abbott Cardiovascular Systems Inc. Method for laser cutting tubing using inert gas and a disposable mask
US8333897B2 (en) 2007-05-31 2012-12-18 Advanced Cardiovascular Systems, Inc. Methods for laser cutting and processing tubing to make medical devices
US8779328B2 (en) 2007-05-31 2014-07-15 Abbott Cardiovascular Systems Inc. Methods for laser cutting tubing to make medical devices

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1266637A1 (en) * 2001-06-11 2002-12-18 Cordis Neurovascular, Inc. Method of manufacturing small profile medical devices
US6612012B2 (en) 2001-06-11 2003-09-02 Cordis Neurovascular, Inc. Method of manufacturing small profile medical devices
WO2008147590A1 (en) * 2007-05-31 2008-12-04 Abbott Cardiovascular Systems Inc. Method for laser cutting tubing using inert gas and a disposable mask
US7932479B2 (en) 2007-05-31 2011-04-26 Abbott Cardiovascular Systems Inc. Method for laser cutting tubing using inert gas and a disposable mask
US8278593B2 (en) 2007-05-31 2012-10-02 Abbott Cardiovascular Systems Inc. Method for laser cutting tubing using inert gas and a disposable mask
US8333897B2 (en) 2007-05-31 2012-12-18 Advanced Cardiovascular Systems, Inc. Methods for laser cutting and processing tubing to make medical devices
US8779328B2 (en) 2007-05-31 2014-07-15 Abbott Cardiovascular Systems Inc. Methods for laser cutting tubing to make medical devices
US9126251B2 (en) 2007-05-31 2015-09-08 Abbott Cardiovascular Systems Inc. Methods for laser cutting and processing tubing to make medical devices

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