WO2002026410A2 - Procede de fabrication de longueurs continues de fil a memoire en forme de bobine helicoidale - Google Patents

Procede de fabrication de longueurs continues de fil a memoire en forme de bobine helicoidale Download PDF

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Publication number
WO2002026410A2
WO2002026410A2 PCT/US2001/030556 US0130556W WO0226410A2 WO 2002026410 A2 WO2002026410 A2 WO 2002026410A2 US 0130556 W US0130556 W US 0130556W WO 0226410 A2 WO0226410 A2 WO 0226410A2
Authority
WO
WIPO (PCT)
Prior art keywords
wire
helical coil
continuous lengths
shaped memory
memory wire
Prior art date
Application number
PCT/US2001/030556
Other languages
English (en)
Other versions
WO2002026410A3 (fr
Inventor
Theodor Kolobow
Original Assignee
National Institutes Of Health
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 National Institutes Of Health filed Critical National Institutes Of Health
Priority to AU1130902A priority Critical patent/AU1130902A/xx
Publication of WO2002026410A2 publication Critical patent/WO2002026410A2/fr
Publication of WO2002026410A3 publication Critical patent/WO2002026410A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F99/00—Subject matter not provided for in other groups of this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B21F3/02—Coiling wire into particular forms helically
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/006—Resulting in heat recoverable alloys with a memory effect
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • 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
    • A61F2/88—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure the wire-like elements formed as helical or spiral coils
    • 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
    • A61M25/0043—Catheters; Hollow probes characterised by structural features
    • A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids

Definitions

  • the present invention relates to a method for fabricating continuous lengths of helical coil shaped memory wire.
  • This helical coil shaped memory wire can be used in such applications as springs, medical stents and reinforcement for medical tubing (e.g. catheters). More specifically, a method is disclosed in which the helically coiled wire can be continuously formed from a special nickel-titanium wire and spooled for convenient storage. When the wire is later unspooled, it will snap back into the desired helical coil form.
  • Helically coiled wire has many uses, the most common of which is as an everyday spring. In the medical field, helically coiled wire is used in such applications as a medical stent to hold blood vessels open or as reinforcement for medical tubing such as blood catheters, drainage catheters or endotracheal tubes.
  • Nitinol nickel-titanium based alloy
  • Nitinol nickel-titanium based alloy
  • Heat/cool Nitinol is characterized by its ability to be readily deformed below certain temperatures and its tendency to expand back to its original shape when heated.
  • helical coils made of "superelastic” Nitinol are not significantly affected by heat or cold and yet have high expansion ratios.
  • a highly elastic, adjustable helical coil stent formed of superelastic Nitinol alloy is described in the inventor's U.S. Patent No. 6,027,516.
  • 3,985,177 discloses a method for continuously forming Nitinol wire from a furnace, there is no teaching that the wire can be helically coiled, stored on a spool and then unspooled into a helical coil shape.
  • Kenmore's U.S. Patent No. 3,399,702 discloses a pickling process in which a wire is unspooled, coiled, pickled and then respooled, there is no disclosure in the Kenmore patent that the wire will automatically reform into a desired helical coil shape when it is unspooled again.
  • the present invention provides a method of and apparatus for continuously forming wire into a helical coil, straightening the formed wire, spooling that straightened wire for convenient transportation and/or storage and then having that wire automatically snap back into the desired helical coil shape when the wire is unspooled.
  • This method large amounts of spooled wire with a "memorized" helical coil shaped can be stored and then used as needed to make helical coil devices.
  • Nitinol wire is passed through a spring forming unit to curve the wire, wrapped around a cylindrical mandrel, passed through a high temperature oven and cooled so that the helical coil shape will be memorized.
  • FIG. 1 shows a schematic view of the helical coiling method and apparatus of the present invention.
  • FIG. 1 shows a preferred method of and apparatus for continuously creating helically coiled memory wire.
  • the method starts with raw wire 10 which often arrives on a spool 12. It is important to select a wire that has the inherent ability to memorize a helical coil shape upon heat treatment so that after it has been heat treated, straightened, respooled and then unspooled, it will automatically reform into the desired helical coil shape. It has been found that nickel-titanium based alloy, such as "Nitinol,” has these desired memory properties. Nitinol, both in its “heat/cool” and “superelastic” forms is commercially available from such suppliers as Fort Wayne Metals of Fort Wayne, Indiana.
  • the process begins by unspooling the raw wire 10 and passing that wire 10 through a Teflon tape unit 14 which, under pressure from weight 16, provides a low friction path for the wire 10.
  • a Teflon tape unit 14 which, under pressure from weight 16, provides a low friction path for the wire 10.
  • the wire is then passed through a spring forming unit 20 to impart a desired curvature to the wire.
  • this spring forming unit 20 consists of highly polished rectangular or square slabs 22, 24, 26 of carbide or polycrystalline diamond coated steel and alignment roller 29.
  • the edge 28 of slab 26 over which the wire is curved should be formed to a small radius. This radius should be chosen to make the helical coil tightly wound in an appropriate diameter.
  • the radius of the edge 28 can be as small as 0.001 inches to make a very tightly would helical coil spring for medical applications or 0.020 inches or larger to make a larger diameter helical coil spring.
  • the edge 28 can be tapered along its length to a variety of radiuses so that many different types of helical coil springs can be made using the same apparatus.
  • the forming of this edge 28 can be accomplished by first grinding with a diamond wheel and then polishing.
  • the space between the slabs 22, 24, 26 in the spring forming unit 20 should be kept very narrow, ideally of approximately the same dimensions as the wire 10.
  • Teflon shims (not shown) can advantageously be placed along the surfaces of the slabs 22, 24, 26 which are contacted by the wire to reduce friction and assist with alignment.
  • a motor drive unit 30 is used in the preferred embodiment.
  • the rollers 32, 34 for this motor drive unit 30 may advantageously be formed of hardened steel. While the combination of a spring forming unit 20 and motor drive unit 30 have been described as the preferred means of curving the wire, those in the art will recognize that there are other suitable techniques for forming a helical coil including conventional coil forming machines.
  • the wire 10 After the wire 10 passes through the motor drive unit 30, it preferably enters a flattened Teflon tubing to temporarily change it from a curved to a flat wire, or it can be directly applied to the mandrel 40.
  • the wire 10 is then wrapped in a helical coil shape 42 around a mandrel 40, which can be formed, for example, from a stainless steel rod or tube. This wrapping around the mandrel 40 should be a relatively passive process, with all forming work being previously done in the spring forming unit 20. As more and more wire 10 is wrapped around the mandrel 40, it moves toward the high temperature oven 50.
  • the helically coiled wire is to be used immediately, it can be removed from the mandrel by suitably cutting the wire.
  • the helically coiled Nitinol wire 42 will gradually lose some "memory" and thereby adversely affect the quality of the finished product.
  • Heating of the helical coiled wire to solidify its "memory" is accomplished using a high temperature oven 50.
  • this high temperature oven is one preferred embodiment, this high temperature oven
  • a hot gas 54 such as air, argon or another inert gas, is heated to about 800° F to 1200° F and passed by the helically coiled wire 42 at an appropriate flow rate, such as 10 liters per minute.
  • the temperature of this hot gas 54 can be maintained at an appropriate level by known methods, such as by use of a thermocouple temperature sensor (not shown).
  • This hot gas 54 raises the temperature of the helical coil sufficiently to set the wire 42 in its helically coiled form.
  • the high temperature oven 50 is suitably insulated to prevent gas leaks and other temperature losses.
  • the process of forming helically coiled memory wire is completed by removing the previously heated helically coiled wire 56 from the mandrel 40 in straightened form, passing the wire through a second Teflon tape unit 60, passing the wire through a second motor drive unit 70, passing the wire over a motor driven sled 80 for proper alignment and finally spooling the wire on second spool 90.
  • the difference between the wire on the original spool 12 and the wire on the second spool 90 is that the wire on the second spool has a memorized helical coil shape even though it is also wound onto a spool in straightened form.
  • the wire When the wire is removed from the second spool 90, it will automatically reform into the same desired helical coil shape it had when it was moving along mandrel 40.
  • the speed of the two motor drive units 30, 70 are carefully coordinated so that the length of wire delivered to the mandrel 40 by motor drive unit 30 exactly matches the length of wire taken up by motor drive unit 70. If motor drive unit 70 is transiently speeded up for a few seconds, the resulting coil will become heat set in a smaller diameter. Conversely, if motor drive unit 70 is transiently slowed down, the resulting coil will be heat set in a slightly larger diameter. Hence, it becomes possible to, within a narrow range, slightly enlarge or reduce the resulting diameter of the formed coils.
  • the finished wire created by the process of the present invention one need only unwind an appropriate length of wire from the second spool 90. Because of its "memory" properties, this finished wire will automatically reform into the desired helical coil shape after being unspooled.
  • the reformed helical coil wire can then be used for any number of purposes. For example, to make a wire reinforced catheter tube, the helically coiled wire can be placed around an inner plastic tube and then coated with plastic polymer. Alternatively, the tube can be co-extruded around the reformed wire. As another application, the reformed wire can be made into a helical coil stent of the type described in the inventor's U.S. Patent No.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Wire Processing (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

L'invention se rapporte à un procédé et à un appareil permettant de fabriquer de manière continue un fil et à lui donner une forme de bobine hélicoïdale, d'enrouler ledit fil de manière à faciliter son transport et/ou son stockage, et d'assurer un retour automatique du fil à sa forme hélicoïdale souhaitée lorsqu'il n'est pas enroulé. La mise en oeuvre dudit procédé permet le stockage de grandes quantités de fil enroulé ayant une forme hélicoïdale 'mémorisée' ainsi que son utilisation ultérieure, selon les besoins, pour la fabrication de dispositifs à bobine hélicoïdale. Dans la réalisation préférée, un fil de Nitinol traverse une unité de formation de ressorts de manière à être incurvé, il est enroulé autour d'un mandrin cylindrique, puis passe par un four à haute température avant d'être refroidi de manière que la forme de bobine hélicoïdale soit mémorisée.
PCT/US2001/030556 2000-09-29 2001-09-27 Procede de fabrication de longueurs continues de fil a memoire en forme de bobine helicoidale WO2002026410A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU1130902A AU1130902A (en) 2000-09-29 2001-09-27 Method to fabricate continuous lengths of helical coil shaped memory wire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US67615700A 2000-09-29 2000-09-29
US09/676,157 2000-09-29

Publications (2)

Publication Number Publication Date
WO2002026410A2 true WO2002026410A2 (fr) 2002-04-04
WO2002026410A3 WO2002026410A3 (fr) 2002-07-04

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PCT/US2001/030556 WO2002026410A2 (fr) 2000-09-29 2001-09-27 Procede de fabrication de longueurs continues de fil a memoire en forme de bobine helicoidale

Country Status (2)

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AU (1) AU1130902A (fr)
WO (1) WO2002026410A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010127646A3 (fr) * 2009-05-04 2011-04-14 Institute Of Physics As Cr, V. V. I. Procédé de traitement thermique et/ou d'inspection des propriétés mécaniques fonctionnelles, en particulier de la contrainte et/ou résistance pendant une transformation, des filaments d'alliage à mémoire de forme, et appareil pour l'application de ce procédé
WO2014120295A3 (fr) * 2012-10-22 2014-10-02 Proportional Technologies, Inc. Procédé et appareil permettant de recouvrir une mince feuille avec un revêtement de bore
CN105013990A (zh) * 2015-07-31 2015-11-04 巴拉斯塑胶（苏州）有限公司 螺旋弹簧管成型机及其成型方法
WO2016142871A1 (fr) * 2015-03-10 2016-09-15 Technical Systems (Pty) Ltd Fabrication d'une vis sans fin sans âme
EP3169376A4 (fr) * 2014-07-14 2018-07-04 Smarter Alloys Inc. Matériaux à mémoires multiples et systèmes, procédés et applications associés
US10238466B2 (en) 2017-06-15 2019-03-26 Cook Medical Technologies Llc Method of making a superelastic medical device with a radiopaque marker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113798410A (zh) * 2021-08-23 2021-12-17 北京航天光华电子技术有限公司 锡环自动缠绕工装

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5437282A (en) * 1993-10-29 1995-08-01 Boston Scientific Corporation Drive shaft for acoustic imaging catheters and flexible catheters
WO1999045161A1 (fr) * 1998-03-05 1999-09-10 Memry Corporation Alliage de beta-titane pseudoelastique et ses utilisations
US6027516A (en) * 1995-05-04 2000-02-22 The United States Of America As Represented By The Department Of Health And Human Services Highly elastic, adjustable helical coil stent

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5437282A (en) * 1993-10-29 1995-08-01 Boston Scientific Corporation Drive shaft for acoustic imaging catheters and flexible catheters
US6027516A (en) * 1995-05-04 2000-02-22 The United States Of America As Represented By The Department Of Health And Human Services Highly elastic, adjustable helical coil stent
WO1999045161A1 (fr) * 1998-03-05 1999-09-10 Memry Corporation Alliage de beta-titane pseudoelastique et ses utilisations

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010127646A3 (fr) * 2009-05-04 2011-04-14 Institute Of Physics As Cr, V. V. I. Procédé de traitement thermique et/ou d'inspection des propriétés mécaniques fonctionnelles, en particulier de la contrainte et/ou résistance pendant une transformation, des filaments d'alliage à mémoire de forme, et appareil pour l'application de ce procédé
WO2014120295A3 (fr) * 2012-10-22 2014-10-02 Proportional Technologies, Inc. Procédé et appareil permettant de recouvrir une mince feuille avec un revêtement de bore
EP3169376A4 (fr) * 2014-07-14 2018-07-04 Smarter Alloys Inc. Matériaux à mémoires multiples et systèmes, procédés et applications associés
US11000741B2 (en) 2014-07-14 2021-05-11 Smarter Alloys Inc. Multiple memory materials and systems, methods and applications therefor
WO2016142871A1 (fr) * 2015-03-10 2016-09-15 Technical Systems (Pty) Ltd Fabrication d'une vis sans fin sans âme
KR20170141657A (ko) * 2015-03-10 2017-12-26 테크니컬 시스템즈 (피티와이) 엘티디 코어리스 오거 제조
AU2016230744B2 (en) * 2015-03-10 2020-07-30 Technical Systems (Pty) Ltd Coreless auger manufacture
US10773287B2 (en) 2015-03-10 2020-09-15 Technical Systems (Pty) Ltd Coreless auger manufacture
KR102401669B1 (ko) 2015-03-10 2022-05-25 테크니컬 시스템즈 (피티와이) 엘티디 코어리스 오거 제조
CN105013990A (zh) * 2015-07-31 2015-11-04 巴拉斯塑胶（苏州）有限公司 螺旋弹簧管成型机及其成型方法
US10238466B2 (en) 2017-06-15 2019-03-26 Cook Medical Technologies Llc Method of making a superelastic medical device with a radiopaque marker

Also Published As

Publication number Publication date
WO2002026410A3 (fr) 2002-07-04
AU1130902A (en) 2002-04-08

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