Tension and fatigue behavior of silver-cored composite multi-strand cables used as implantable cables and electrodes

Lewandowski, John J.; Varadarajan, Ravikumar; Smith, Brian T.

doi:10.1016/j.msea.2008.03.016

Cited by 14 publications

(34 citation statements)

References 13 publications

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“…Guide wires, catheters, cardiac leads, stents, staples, functional electrical stimulation (FES) systems, eyeglass frames and orthodontic braces are just a sampling of the devices that are manufactured with wire diameters ranging from 10s to 100s of micrometres. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Medical device reliability and performance is critical to the successful treatment of the particular pathology as well as patient safety. Furthermore, a firm understanding of the factors controlling the fatigue and fracture behaviour of the device and its constituents is paramount for the design and optimisation of these devices.…”

Section: Introductionmentioning

confidence: 99%

“…A variety of test techniques have been developed to characterise the fatigue properties of wires and cables. Wire fatigue tests reported in the literature for use in evaluating biomedical materials such as alternating bending testing, 29,30,39,62,63 axial fatigue testing, 25,33,36,37,42,44,56,72 flex bending fatigue testing, 4,10,11,34 pulsatile fatigue testing, 29,39,63,67 rotating bending testing 2,7,8,12,14,[22][23][24][26][27][28][29][30][31][32]35,[38][39][40][41]43,[45][46][47][48][49][50][51]…”

Section: Introductionmentioning

confidence: 99%

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Fatigue and fracture of wires and cables for biomedical applications

Gbur

Lewandowski

2016

International Materials Reviews

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Fine wires and cables play a critical role in the design of medical devices and subsequent treatment of a large array of medical diagnoses. Devices such as guide wires, catheters, pacemakers, stents, staples, functional electrical stimulation systems, eyeglass frames and orthodontic braces can be comprised of wires with diameters ranging from 10s to 100s of micrometres. Reliability is paramount as part of either internal or external treatment modalities. While the incidence of verified fractures in many of these devices is quite low, the criticality of these components requires a strong understanding of the factors controlling the fracture and fatigue behaviour. 1,2 Additionally, optimisation of the performance and reliability of these devices necessitates characterisation of the fatigue and fracture properties of its constituent wires. A review of cable architecture and stress states experienced during testing is followed by an overview of the effects of changes in material composition, microstructure, processing and test conditions on fracture and fatigue behaviour of wire and cable systems used in biomedical applications. The review concludes with recommendations for future work.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue and fracture of wires and cables for biomedical applications

Gbur

Lewandowski

2016

International Materials Reviews

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“…11 Alloy Co-20Cr-35Ni-10Mo, a Co-based alloy with a nominal composition of 35%Co-35%Ni-20%Cr-10%Mo in wt%, provides strength and corrosion resistance for the composite wire, while the silver core provides high conductivity for transmission of signals and power in the NNPS. Multiple 58-μm-diameter composite wires comprise the network cables, which are then polymer-coated with biocompatible materials such as perfluoroalkoxy (PFA).…”

Section: Introductionmentioning

confidence: 99%

“…In the event of mechanical fracture of a wire in the cable, [11][12] the silver core may be exposed in vivo and the corrosion of silver may cause the release of Ag + cations, the formation of solid silver chloride (AgCl), or the formation of complex compounds such as argentichloride (AgCl n n-1 ) or other complexes with protein ligands. The toxicology of silver and silver compounds for humans and animals was reported ranging from minor effects such as skin discoloring to severe dysfunction or death.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Silver-Cored Co-20Cr-35Ni-10Mo Composite for Networked Neuroprosthetic System

Ha¹,

Payer²

2011

Corrosion

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Corrosion behavior of a silver-cored composite wire with Co-based alloy Co-20Cr-35Ni-10Mo outer tube and a silver core in vitro conditions was investigated. The electrochemical effect of the component materials on the overall corrosion behavior of the composite wire was elucidated. The formation of silver chloride corrosion product on the corroding silver core limited ionic transport therefore restricted further dissolution at the silver metal surface. Galvanic action between a Co-20Cr-35Ni-10Mo cathode and a silver anode was examined. Dissolution rate of the silver core in a composite wire obtained from immersion tests in a physiological solution of 9 g/L NaCl at 37°C was approximately 22 µm/y, i.e., 0.28 µg/y silver dissolved for a 37-µm-diameter silver core. Nearly all of the silver dissolved precipitate as silver chloride, i.e., approximately 0.37 µg/y. KEY WORDS: galvanic corrosion, networked neuroprosthetic, silver chloride, silver corrosion ISSN 0010-9312 (print), 1938-159X (online) 11/000053/$5.00+$0.50/0 © 2011, NACE International CORROSION ENGINEERING SECTION 046002-2 CORROSION-Vol. 67, No. 4 FIguRe 9. SEM micrograph of the 2-mm-long silver-cored composite specimens after immersion in 9 g/L NaCl solution at 37°C for different periods of time: (a) 1, (b) 5, and (c) 25 weeks. FIguRe 10. Depth of penetration at the silver core of the 2-mm-long silver-cored composite specimens after different immersion time in 9 g/L NaCl solution at 37°C. FIguRe 11. Calculated and experimental potentiodynamic polarization curves of the silver-cored composite wire in 9 g/L NaCl solution at room temperature. FIguRe 12. Evans diagram of the Co-20Cr-35Ni-10Mo outer tube and the silver core couple in Ringer's solution at 37°C.

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“…Recent years have witnessed a surge in the usage of the alloy for medical applications. As a result, there were many fatigue studies [212,365,366] conducted on MP35NLT and its alloys in the wire [367,368] and cable forms [233,369,370]. Prior studies performed on MP35NLT…”

Section: Fatigue Behavior In Co-cr-ni-mo Alloy Wires Drawn With Diffementioning

confidence: 99%

Co-Cr-Ni-Mo wires for medical applications : processing, mechanical, microstructure and fatigue characterization

Gvk¹

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Tension and fatigue behavior of silver-cored composite multi-strand cables used as implantable cables and electrodes

Cited by 14 publications

References 13 publications

Fatigue and fracture of wires and cables for biomedical applications

Fatigue and fracture of wires and cables for biomedical applications

Corrosion of Silver-Cored Co-20Cr-35Ni-10Mo Composite for Networked Neuroprosthetic System

Co-Cr-Ni-Mo wires for medical applications : processing, mechanical, microstructure and fatigue characterization

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