100 µm, 35N LT wire: EI = 1.00 (normalized) 1.000 35N LT-DFT-10%Ag: EI = 0.800 0.993 (.07% loss) 35N LT-DFT-25%Ag: EI = 0.956 (4.4% loss) 35N LT-DFT-60%Ag: EI = 0.750 (15% loss)
•Strength – 275 MPa (40 ksi) to 2750 MPa (400+ ksi) •Form - fine wire, coated cable, SLT® wire, shaped ribbon
DFT® product can be shaped into nearly unlimited forms, similar to monolithic wire.

© Jeremy E. Schaffer 2009 jeremy_schaffer@ +1 (260) 438 4119
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CASE 1 – Results
(1) Stiff 35N LT sheath
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DFT® - Material selection
OUTER SHEATH (TUBING) 35N LT® (ASTM F562) MP35N ®(ASTM F562) Nitinol 316 LVM FWM 1058 (ASTM F1058) Platinum & Alloys Tantalum & Alloys High temp superalloys Your choice CORE MATERIAL Silver Platinum & Alloys Palladium & Alloys Tantalum Titanium & Alloys 35N LT® Tungsten-Rhenium Pure Tungsten (limited) Your choice OTHER COMBINATIONS Intermediate ceramics or polymerics Polymer coated DFT® such as ETFE, PTFE Nutrient metals such as pure Fe or Mg Oxidized layers
Silver Core Ratio [d/D]^2
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Bending Stiffness
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DFT Property Relationships
100 µm, 35N LT wire: 8 mS-m (millisiemen-meter) 1.000 2000 MPa 35N LT-DFT-10%Ag: 50 mS-m 0.800 (6X increase) 1835 MPa (8% decrease)
Radiopaque core/sheath DFT – Stent, Guide Wire, Embolic Protection, CRM
Elastic core DFT – Guide Wire, Stylet Wire, Feedthrough pin
35N LT-DFT-Beta Ti Pt20Ir-DFT-35N LT
A brief introduction to the Fort Wayne Metals DFT® product range
Jeremy E. Schaffer Research & Development Engineer
9-December, 2009
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CASE 2 – Radiopaque Core DFT
Application: Stent device Specifications: Elastic, low modulus sheath Radiopaque, low strength core material Needs to behave like NiTiNOL Better interface than competition Solution: Binary NiTi sheath, clean interface and a high purity Platinum or Tantalum core material.
(2) Flexible NiTiNOL or Beta Titanium tip
2500
stress [MPa]
1250
0 0 % strain 8
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0.600
0.400
0.200
0.000 0% 20% 40% 60% 80% 100% Silver Core Ratio [d/D]^2
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© Jeremy E. Schaffer 2009 jeremy_schaffer@ +1 (260) 438 4119
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CASE 2 – Results
60 kV X-ray source Characteristic NiTi, stress-strain behavior at 25 °C Significantly increased radiopacity Concentric, clean interface condition 0.25 mm wire diameter
DFT® product can be manufactured with 1, 2, or more layers, with non-concentric internal filaments, including electrically isolative intermediate materials and in non-circular sections.
Extreme corrosion resistance – CRM Shock Coil Contact, Neural Site Contact
Pt10Ir-DFT-35N LT/Ag Pt20Ir-DFT-Tantalum
1 FWM
does not claim biocompatibility for any wire materials we produce. This must be determined for the final product assembly by the finish device manufacturer.
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DFT Applications
other Biostimulation or 1biocompatible electrical applications. 35N LT-DFT-28%Ag NiTi-DFT-28%Ag Pt10Ir-DFT-41%Ag
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CASE 3 – Corrosion, Conductivity
Application: Biostimulator with direct tissue contact Specifications: Highly inert outer surface for direct tissue stimulation Good overall material strength and fatigue resistance Good electrical conductivity Solution: Alloyed platinum shell with a conductive, pure platinum core.
NiTi, 10%Pt, 30%Pt
FWM DFT®
Competitive Product
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