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The invention relates to a method for producing a small thin-walled tube for a medical application or for a medical product, in particular for a stent, wherein a blank of an in particular bioresorbable magnesium alloy is deformed to produce a small tube, after which the small tube is used for medical purposes or from which the medical product, such as a stent, can be made. In order to be able to produce the small tube in one step and with high precision, it is provided according to the invention that a male die (2) with a base body (3) and a mandrel (4) tapered relative to the base body (3) and the blank is provided with a blind hole or an opening, wherein a diameter of the blind hole or the opening of the blank is equal to or greater than an outer diameter of the mandrel (4), after which the blank with inserted mandrel (4) with the male die (2) is pressed forwards at least in part through a female die (5) with a receiving region (6) and a contouring region (7), wherein the contouring region (7) has a free diameter, which is larger than the outer diameter of the mandrel (4), but smaller than an outer diameter of the blank, in order to form the small tube.

Titel:	Method for producing a small thin-walled tube from a magnesium alloy
Autor/in / Beteiligte Person:	Birgmann, Alois ; Brandecker, Martin ; Kuehlein, Maria ; Waltenberger, Thomas
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2016
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 9,227,235 Publication Date: January 05, 2016 Appl. No: 13/321427 Application Filed: May 19, 2010 Assignees: LKR LEICHTMETALLKOMPETENZZENTRUM RANSHOFEN GMBH (Ranshofen, AT) Claim: 1. A method for producing a small thin-walled tube for a medical application or for a medical product, the method comprising: shaping an extruded magnesium alloy blank to form a small tube, whereby the small tube is usable for medical purposes or the medical product, wherein a male die comprises a base body and a mandrel tapered relative to the base body and the blank comprises one of a blind hole or an opening having a diameter that is equal to or greater than an outer diameter of the mandrel, the shaping comprising inserting the mandrel into the one of the blind hole or opening of the blank and then pressing the blank forward at least in part through a female die comprising a receiving region and a contouring region having a diameter that is larger than the outer diameter of the mandrel, but smaller than an outer diameter of the blank, in order to form the small tube. Claim: 2. The method according to claim 1 , further comprising selecting the outer diameter of the blank according to a diameter of the receiving region. Claim: 3. The method according to claim 2 , wherein the blank has a cylindrical shape. Claim: 4. The method according to claim 1 , further comprising pressing the blank through the female die at least one of in a heated state and/or with heating. Claim: 5. The method according to claim 4 , wherein the blank is pressed through the female die at a temperature in a range of 200° C. to 450° C. Claim: 6. The method according to claim 1 , further comprising at least one of heating the female die and/or the male die. Claim: 7. The method according to claim 1 , wherein the blank has an outer diameter of no more than 10 mm and the produced small tube has an outer diameter of less than 3 mm and a wall thickness of less than 0.5 mm. Claim: 8. The method according to claim 1 , further comprising drawing off an extrusion butt adhering to the male die with a scraper during a retraction of the male die into a starting position. Claim: 9. The method according to claim 8 , wherein, after the male die is retracted, the method further comprises ejecting the extrusion butt from the female die. Claim: 10. The method according to claim 7 , wherein the outer diameter of the produced small tube is less than 2.5 mm. Claim: 11. The method according to claim 7 , wherein the wall thickness of the produced small tube is less than 0.5 mm. Claim: 12. The method according to claim 7 , wherein the wall thickness of the produced small tube is between 70 to 300 μm. Claim: 13. The method according to claim 1 , further comprising forming a stent from the small tube. Claim: 14. The method according to claim 1 , wherein the extruded magnesium alloy blank is a biosorbable extruded magnesium alloy blank. Patent References Cited: 1802785 April 1931 Singer ; 1982677 December 1934 Littler ; 2024186 December 1935 Rober ; 2950816 August 1960 Arenz ; 3394578 July 1968 Biginelli ; 3552173 January 1971 Biginelli ; 3851516 December 1974 Garner et al. ; 3408846 November 2005 Schofield ; 8202477 June 2012 Papirov et al. ; 2007/0077163 April 2007 Furst et al. ; 2009/0056405 March 2009 Uan et al. ; 2013/0218265 August 2013 Becher et al. ; 1403225 March 2003 ; 1792381 June 2006 ; 101015841 August 2007 ; 101085377 December 2007 ; 101549361 October 2009 ; 101549362 October 2009 ; 20 57 865 June 1971 ; 1 840 235 October 2007 ; 97/03769 February 1997 Other References: Wu, “Study of the Forming Process of the Minor Diameter Thin Wall Magnesium Alloy Tubes,” Engineering Technology, No. 2, Series 1, pp. 6 and 27-36 (2009). cited by applicant ; Chinese Office action conducted in counterpart Chinese Appln. No. 201080021868.X (Aug. 19, 2013) (w/ English language translation). cited by applicant ; Japan Office Action conducted in counterpart Japan Appln. No. 2012-511089 (Nov. 26, 2013) (w/ partial English language translation). cited by applicant ; European Office Action conducted in counterpart European Appln. No. 10 721 621.0-1702 (Dec. 23, 2014) (w/ English translation). cited by applicant Primary Examiner: Jones, David B Attorney, Agent or Firm: Greenblum & Bernstein, P.L.C.

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Method for producing a small thin-walled tube from a magnesium alloy