An <i>in vitro</i> and <i>in vivo</i> analysis of anodized tantalum capacitive electrodes: Corrosion response, physiology, and histology

Johnson, P. F.; Bernstein, J.; Hunter, G.; Dawson, W W; Hench, Larry L.

doi:10.1002/jbm.820110502

Cited by 48 publications

(16 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ta has excellent corrosion resistance because of its highly stable surface oxide layer, which prevents electron exchange between the metal and the adsorbed biological species [26,27]. It has been coated on a 316L SS surfaces to improve corrosion properties, thereby enhancing the biocompatibility of 316L SS [28].…”

Section: Tamentioning

confidence: 99%

Coronary stents: A materials perspective

et al. 2007

View full text Add to dashboard Cite

Section: Tamentioning

confidence: 99%

Coronary stents: A materials perspective

et al. 2007

View full text Add to dashboard Cite

“…More than 50 years ago its potential in regard to human implants was studied in animal and human experiments. [26][27][28][29] It has been used for a wide variety of implants 30 including pacemaker electrodes, 31 cranioplasty plates, 32 ligation clips, 33 femoral endoprostheses, 34 as wire, foil and mesh for nerve repair, 35 contrast media for airwave radiographic studies, 36 and as a radiopaque marker for following bone growth and implant migration. 37 Osseointegration has previously been demonstrated using non-porous tantalum implants in dental and orthopaedic applications for periods of up to 8 to 12 years.…”

Section: 21mentioning

confidence: 99%

Characteristics of bone ingrowth and interface mechanics of a new porous tantalum biomaterial

Bobyn

Stackpool

Hacking

et al. 1999

The Journal of Bone and Joint Surgery. British volume

494

268

View full text Add to dashboard Cite

We have studied the characteristics of bone ingrowth of a new porous tantalum biomaterial in a simple transcortical canine model using cylindrical implants ‫01ן5‬ mm in size. The material was 75% to 80% porous by volume and had a repeating arrangement of slender interconnecting struts which formed a regular array of dodecahedron-shaped pores. We performed histological studies on two types of material, one with a smaller pore size averaging 430 µm at 4, 16 and 52 weeks and the other with a larger pore size averaging 650 µm at 2, 3, 4, 16 and 52 weeks. Mechanical push-out tests at 4 and 16 weeks were used to assess the shear strength of the bone-implant interface on implants of the smaller pore size.The extent of filling of the pores of the tantalum material with new bone increased from 13% at two weeks to between 42% and 53% at four weeks. By 16 and 52 weeks the average extent of bone ingrowth ranged from 63% to 80%. The tissue response to the small and large pore sizes was similar, with regions of contact between bone and implant increasing with time and with evidence of Haversian remodelling within the pores at later periods. Mechanical tests at four weeks indicated a minimum shear fixation strength of 18.5 MPa, substantially higher than has been obtained with other porous materials with less volumetric porosity. This porous tantalum biomaterial has desirable characteristics for bone ingrowth; further studies are warranted to ascertain its potential for clinical reconstructive orthopaedics. J Bone Joint Surg [Br] 1999;81-B:907-14. Received 9 July 1998; Accepted after revision 5 March 1999 In the last 20 years a variety of porous surfaces and materials has been used to obtain fixation of bone ingrowth in total hip and knee prostheses. The most common include titanium and cobalt-chrome-alloy sintered beads, diffusionbonded titanium, fibre metal, and titanium plasma spray.

show abstract

“…The results of previous studies have shown that Ta is more corrosion resistant [17] than 316L stainless steel and nitinol, is radio-opaque, a property that may facilitate the follow-up of stent catheterization, and is biocompatible [18][19][20][21][22]. For these reasons, Ta may constitute a good alternative to other materials traditionally used in endovascular surgery.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Treatments on Anodic Oxide Film Growth and Electrochemical Properties of Tantalum used for Biomedical Applications

Silva¹,

Silva²,

Rondot

2006

J Biomater Appl

View full text Add to dashboard Cite

Self-expandable nitinol (nickel-titanium) alloys and 316L stainless steel are the most commonly used materials in the production of coronary stents. However, tantalum (Ta) has already been used to make stents for endovascular surgery and may constitute an alternative to other materials because of its better electrochemical performance, namely its higher corrosion resistance, as well as its radio-opacity. The characterization of wet polished, chemically polished, wet polished anodized, and chemically polished anodized Ta electrodes has been performed in a 0.15 M NaCl solution (simulated body fluid) using U corr ¼ f(t) measurements, anodic polarizations, capacity measurements, anodic oxidations, and atomic force microscopy (AFM) imaging. Anodic polarization curves have shown that the abnormal current density peak with a maximum value around 1.65 V (critical applied potential, U c ) disappeared for the anodized electrodes indicating a probable relationship *Author to whom correspondence should be addressed. E-mail: ras@isep.ipp.pt between the surface states and the film growth. These results are confirmed by capacity measurements. The behavior of wet polished and chemically polished electrodes during anodic oxidations seemingly indicated that for these particular treatments the film growth is different. The AFM images and roughness measurements have shown that chemical polishing produced smoother electrodes, a fact probably related to the differences in film growth. JOURNAL OF BIOMATERIALS APPLICATIONS

show abstract

An in vitro and in vivo analysis of anodized tantalum capacitive electrodes: Corrosion response, physiology, and histology

Cited by 48 publications

References 15 publications

Coronary stents: A materials perspective

Coronary stents: A materials perspective

Characteristics of bone ingrowth and interface mechanics of a new porous tantalum biomaterial

Effect of Surface Treatments on Anodic Oxide Film Growth and Electrochemical Properties of Tantalum used for Biomedical Applications

Contact Info

Product

Resources

About