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Topic: Nitinol


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In the News (Wed 15 Feb 12)

  
  Primary Patency of Femoropopliteal Arteries Treated with Nitinol versus Stainless Steel Self-expanding Stents: ...
of noncoated nitinol stents in the superficial femoral artery,
to implant a nitinol stent or a stainless steel stent and the
Balloon angioplasty versus implantation of nitinol stents in the superficial femoral artery.
radiology.rsnajnls.org /cgi/content/full/232/2/516   (3988 words)

  
 Nitinol Tube   (Site not responding. Last check: 2007-10-26)
Nitinol is an alloy of nickel and titanium whose superelastic properties have found widespread use in the manufacture of cardiovascular and other medical devices, including guide wires.
Nitinol tube is of particular interest as a supelastic medium which can be placed through twisting cavities which are not normally accessible by less elastic media such as stainless steel tube.
Nitinol tube however remains flexible, and its biocompatibility, fatigue strength and corrosion resistance makes it useful in providing a route for deployment of miniature medical devices inside the body, and for making those medical devices themselves.
www.attica.com /nitinoltube/nitinol_tube.html   (198 words)

  
 David Herron Shape Memory Alloys
NiTinol is a generic trade name for NiTi alloys which are also referred to as Memory wire, Muscle wire or Flexinol depending on who is speaking and what use the NiTi alloy is being put to.
NiTinol wire when heated so that it crosses the temperature transition point results in a contraction approximately 100 times greater than the expansion that would be exhibited in other common materials experiencing an equal temperature change.
Nitinol derives its name from the fact that it is made from nickel (Ni) titanium (Ti) and was developed at the Naval Ordinance Lab (Nol).
www.southernct.edu /departments/dro/~herrond1/physics/sma.php   (2163 words)

  
 Shape Memory Alloys
The properties of Nitinol are particular to the exact composition of the metal and the way it was processed.
Nitinol is also to an extent impact- and heat-resistant (Kauffman and Mayo, 4).
Nitinol is being used in robotics actuators and micromanipulators to simulate human muscle motion.
www.stanford.edu /~richlin1/sma/sma.html   (1432 words)

  
 Laterally oscillating nitinol engine - Patent 4691517
The laterally oscillating nitinol engine of claim 1 wherein the means for absorbing a portion of the energy to move the drive element from the cold bath to the hot bath includes a spring means in tension interconnecting the ends of said shape memory element.
A shape memory alloy element, such as nitinol wire, is disposed in U-shaped flexure secured at its ends to the bearing block and to the second member at a position intermediate the sliding connection with the bearing block and the pivotal connection with the second member.
A shape memory alloy power element in the form of a nitinol wire 11 is disposed in flexure secured at its ends to the bearing block and to the second drive member.
www.freepatentsonline.com /4691517.html   (1953 words)

  
 Dynalloy, Inc. Makers of Dynamic Alloys for Electrically Driven Applications
Nitinol was released to the public in the early 1960s by the Naval Ordnance Laboratories.
Nitinol is used in three basic forms, superelastic, shape memory, and Flexinol® actuator wires.
Superelastic Nitinol is a very flexible or elastic form of the alloy and has the ability to recover strains to the order of 8%.
www.dynalloy.com /AboutNitinol.html   (358 words)

  
 UCLA Physician Daniel Levi, M.D.
Using thin films of nitinol, Dr Levi works in collaboration with UCLA engineers to developed a heart valve for children that can be inserted into the body via a catheter.
Nitinol is a material that has shape-memory and superelastic properties.
Although nitinol can be found in devices such as stents, a thinner film version of the material hasn???t been used in a commercially available medical device, according to the researchers.
healthcare.ucla.edu /mattel/institution/physician?personnel_id=9864   (521 words)

  
 Fort Wayne Metals | Nitinol   (Site not responding. Last check: 2007-10-26)
Nitinol is a family of alloys which are comprised of near equiatomic percentages of nickel and titanium.
A few variants of Nitinol also include small amounts of a third element that is used to alter certain properties.
Nitinol wire is used in a variety of medical device applications including guidewires, catheters, stents, filters, needles, guide pins, orthodontic appliances, endodontic files, stone retrieval baskets and stylets.
www.fwmetals.com /resources_specsheets/nitinol.html   (587 words)

  
 Halfbakery: Nitinol car
Nitinol has the useful property of being electrically conductive, and can therefore be heated by passing current.
In the case of nitinol, one of a group of SMA's (shape memory alloys), this is not so.
The short answer is from the crystal lattice of the nitinol as it resumes its "memory shape" in the Austenite phase.
www.halfbakery.com /idea/Nitinol_20car   (2002 words)

  
 TALKING ELECTRONICS Nitinol P2
Nitinol is an alloy of nickel and titanium that belongs to a class of materials called SHAPED MEMORY ALLOYS (SMA).
Nitinol for example contracts when heated, which is the opposite to standard metals, which expand when heated.
The nitinol wire used in the loops was 22 mils in diameter.
www.talkingelectronics.com /Projects/Nitinol/Nitinol-2.html   (3152 words)

  
 Biomedical testing applications-Nickel Titanium (Nitinol)
Nitinol wire is thin yet very hard and causes numerous problems with gripping.
The Instron solution for testing Nitinol wire conforms to ASTM standard F2063, 'Standard Specification for Wrought Nickel-Titanium Shape Memory Alloys for Medical Devices and Surgical Implants' and F2516 ‘Standard Test Method for Tension Testing of Nickel-Titanium Superelastic Materials’.
Pneumatic cord and yarn grips are most effective in obtaining maximum stress at failure by reducing the stress concentration on the specimen at the grip faces and by allowing easy loading and alignment of the specimen.
www.instron.com /wa/applications/biomedical/biomaterial/nitinol.aspx   (277 words)

  
 TALKING ELECTRONICS Nitinol Page-1
Nitinol and Flexinol are also available as rod, tube, sheet as well as many other shapes and you should read the information on the company-website before making any decisions.
Nitinol is called Flexinol and possibly vise versa by the layman, but the two are not the same in performance.
The Nitinol should be long enough to hold the sticks at a right angle when the wire is taut.
www.talkingelectronics.com /FreeProjects/Nitinol/Nitinol-1.html   (1486 words)

  
 Shape memory alloy - Wikipedia, the free encyclopedia
The nickel-titanium alloys were first developed in 1962–1963 by the Naval Ordnance Laboratory and commercialized under the trade name Nitinol (an acronym for Nickel Titanium Naval Ordnance Laboratories).
Their remarkable properties were discovered by accident: anecdotally, samples of the alloy were being subjected to strength tests by being pounded with hammers to see how much force was necessary to deform them.
Under the transition temperature, Nitinol is in the martensite phase and can be bent into various shapes.
en.wikipedia.org /wiki/Nitinol   (1237 words)

  
 ScienceDaily: University Of Florida Engineers Probe "Shape Memory" Alloy For Better Prostheses
While the apparatus is merely a weight-lifting machine now, the hope is the research will one day lead to a nitinol "muscle" that can mimic the strength and motion of the real thing doing the work of a tendon or other major muscle in a next-generation prosthesis.
To demonstrate that, Santiago-Anadon built a machine that uses 104 nitinol wires to displace the equivalent of 135 pounds a weight measured by the wires' action against a metal block attached to mechanical and hydraulic springs.
Nitinol already is used in outer space, for example in cylinders placed around bolts that elongate under temperature change, breaking the bolt to open a box and release a structure such as an antenna on a satellite.
www.sciencedaily.com /releases/2002/08/020816072745.htm   (830 words)

  
 UroToday - European Urology - The Bell-Shaped Nitinol Prostatic Stent in the Treatment of Lower Urinary Tract Symptoms: ...
To assess the efficacy, safety, and durability of the bellshaped nitinol prostatic stent in the treatment of moderate to severe lower urinary tract symptoms caused by benign prostatic enlargement in otherwise healthy patients.
A prospective study was conducted to determine the efficacy, safety, and durability of the bell-shaped nitinol prostatic stent as a treatment option for moderate to severe LUTS caused by BPE in otherwise healthy patients.
The bell-shaped nitinol prostatic stents were provided free of charge by Endocare, Inc. The authors would like to thank A.S. Glas, M.D., Ph.D. for her contribution to the statistical analysis.
www.urotoday.com /browse_categories/bph__male_luts/european_urology__the_bellshaped_nitinol_prostatic_stent_in_the_treatment_of_lower_urinary_tract_symptoms_experience_in_108_patients.html   (3309 words)

  
 VascularWeb: Nitinol stent use superior to balloon angioplasty for peripheral
Nitinol stent use superior to balloon angioplasty for peripheral artery disease
The average lengths of the treated segment were 132 and 127 mm in the stent and angioplasty groups, respectively.
Compared with angioplasty, implantation of nitinol stents was associated with significant improvements in the distance walked on treadmill testing.
www.vascularweb.org /_CONTRIBUTION_PAGES/Medical_News_Reuters/Nitinol_stent_use_superior_to_balloon_angioplasty_for_periph.html   (353 words)

  
 Nitinol Wire - Low wieght, new concept for a mechanical shutt...
Nitinol Wire - a new concept taken from the Sojourner Space craft.
Bascially put, Nitinol wire is a recently employed alloy that will contract when subjected to electrical current and then return to it original lenght after a cooling period.
It was successfully used on the sojourner space craft to actuate a dust collection experiment and my initial research into Nitinol Wire, also called SMA's or shaped memory alloys, has convinced me to try it out as a shutter release.
arch.ced.berkeley.edu /kap/discuss/_kapdiscuss/00000422.htm   (242 words)

  
 lf205, Hardware: Building a Linux-controlled walking robot   (Site not responding. Last check: 2007-10-26)
Nitinol is a shape-memory alloy actuator wire made of nickel and titanium that contracts like muscles when electrically heated.
As a lot of crimping is needed now you should better test it with a little bit of nitinol before you start: Put the end of the nitinol wire into the very thin brass tubes (1mm diameter outside) and then squeeze the brass tube with the needle-nose-pliers.
There you put the nitinol wire through the last hole that is possible on the left and straight side.
www.linuxfocus.org /English/May2001/article205.shtml   (3194 words)

  
 ScienceDaily: Alloy With "Memory" Helps Bones Heal Faster And More Reliably
Nitinol, if it is stretched before being wrapped around a fractured bone, resists loosening because it remembers its original shape.
The Nitinol wire was stretched to 108 percent of its length before it was wrapped around the cylinders.
Nitinol was still able to maintain nearly the same level of compression between the cylinders.
www.sciencedaily.com /releases/2000/05/000522084135.htm   (844 words)

  
 Tech News Nitinol Alloys
ASTM Subcommittee F04.12 on Metallurgical Materials, part of Committee F04 on Medical and Surgical Materials and Devices, is developing four draft standards useful in the design and manufacture of medical devices and surgical implants.
The nickel-titanium shape memory alloys described in these standards are commonly called nitinol alloys.
Nitinol is a family of alloys designated by a transformation temperature measured under controlled conditions and after a specified thermomechanical history.
www.astm.org /SNEWS/FEBRUARY_2000/nitinol_alloy.html   (530 words)

  
 New Embolization Coil Containing a Nitinol Wire Core: Preliminary In Vitro and In Vivo Experiences -- Kónya et ...
Two coils, one with nitinol reinforcement (right) and one without reinforcement (left), which were identical in length and diameter, were suspended from a metal bar.
Retrievable homemade coils with TSM nitinol wire cores were tested in the IVC of the same pig.
Another coil of the same size reinforced with an SE nitinol wire core was placed in the mid-portion of the right carotid artery.
www.jvir.org /cgi/content/full/12/7/869   (5255 words)

  
 >verohnero<   (Site not responding. Last check: 2007-10-26)
NITINOL KNITS use the Shape Memory effect to deploy...
On the summer of 2005 i conducted, with the generous help of Trafi srl, an investigation that aimed at exploring the potential of using textile techniques, to construct structures from Shape Memory Alloy with the capacity to perform shape-change.
The result were a series of self deploying envelopes, composed of such structure (skeleton) laminated with a non-woven fabric, that could be activated through resistive heating (electrical current).
www.verohnero.com /index_nitinol.htm   (110 words)

  
 URI GELLER'S INFLUENCE ON THE METAL ALLOY NITINOL
To cause permanent change in the shape of nitinol wire, which Geller repeatedly did, normally requires that one heat the wire to a temperature of about 900 degrees F and reshape it under considerable tension.
The alloy has been extensively studied and its characteristics are well known, the main one being that nitinol wire has a physical memory for the shape in which it is formed at the time of manufacture.
Geller had clearly influenced the alloy nitinol in a most unusual way: it was as if the kinks he produced had actually been manufactured into the wires, even though it had been conclusively determined before any experimentation that the permanent configuration of the wires was that of straight lines.
www.uri-geller.com /books/geller-papers/g6.htm   (2248 words)

  
 Nitinol Medical Technologies Acquires 23% Ownership of Image Technologies Corporation
As the commercial feasibility of the technology is uncertain, Nitinol Medical intends to charge the amount of its investment, including expenses, to operations as in-process research and development.
Further, Nitinol Medical has extended to Image Technologies a line of up to $2.0 million of senior debt, convertible to Preferred Stock and equivalent to up to an additional 20% ownership of Image Technologies.
Nitinol Medical also has a 24 month option to purchase the remaining 57% of Image Technologies for $24.5 million.
www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/129235&EDATE=   (658 words)

  
 Nitinol Products
Nitinol has trained into a straight shape at high temperature (about 600° C) and allowed to cool to room temperature, where it can be easily deformed and welded into a loop.
The advantage of the BioMetal Helix over standard Nitinol wire is that it may be stretched and contracted to twice its length.
Nitinol demonstration of long life and durability, butterfly gently flaps its wings, beautiful lifelike motion makes it a great gift as well.
www.imagesco.com /catalog/nitinol/nitinol.html   (776 words)

  
 Valve Actuator using Nitinol
One of the later prototypes of the Nitinol activated valve.
In this project, SH Scientific Systems was part of a team of researchers and technicians developing a novel method of controlled opening and closing of a valve using Nitinol, a "shape memory" alloy.
SHSS carried out the basic research for the project, quantifying the performance of Nitinol for the planned application, and collecting the basic data necessary to develop control algorithms.
www.shscientific.com /Valve.htm   (150 words)

  
 (WO/1996/024404) ESOPHAGEAL DILATION BALLOON CATHETER CONTAINING FLEXIBLE NITINOL WIRE   (Site not responding. Last check: 2007-10-26)
The nitinol wire (24) is positioned within at least the catheter balloon (18) and the catheter tip (22), and preferably extends the entire length of the catheter shaft (12) through the shaft flow lumen (14).
The longitudinal positions of the nitinol wire (24) and the balloon (18) are fixed relative to one antoher by a radiopaque insert (32) in the distal end (16) of the catheter shaft (12).
The nitinol wire (24) preferably includes a tapered portion (28) extending from a location (30) within the balloon (18) to the distal end (26) of the nitinol wire (24) in the flexible catheter tip (22).
www.wipo.int /pctdb/en/wo.jsp?WO=1996/24404   (632 words)

  
 STENTS, NiTiNOL   (Site not responding. Last check: 2007-10-26)
Most stents are stainless steel or nitinol and may be drug-coated to improve the outcome.
Nitinol has some advantages, particularly for exposed arteries like the carotids in you neck - it can be re-crushed after implantation (e.g.
Nitinol has a austenite (A) phase stable at higher temperatures and a martensite (M) phase stable at lower temperatures**.
www.mse.cornell.edu /courses/engri119/Class_Notes/stents__nitinol.html   (1107 words)

  
 Subacute Thrombosis and Vascular Injury Resulting From Slotted-Tube Nitinol and Stainless Steel Stents in a Rabbit ...   (Site not responding. Last check: 2007-10-26)
B, D, and F (magnification x1000), Nonimplanted nitinol stent demonstrating nominal surface finish roughness; nitinol stent at 4 days with scattered platelets and erythrocytes (arrows); and stainless steel stent at 4 days with confluent erythrocyte and fibrin thrombus on strut (S) with platelet clumps (arrows), respectively.
C and D, Nitinol stent at 2 and 5 atm showing uniform axial and radial expansion of the stent.
nitinol stent we used remains in the martensite at body temperature.
circ.ahajournals.org /cgi/content/full/94/7/1733   (4468 words)

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