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Conference Paper: Suppression of nickel release in nickeltitanium alloys by plasma immersion ion implantation surface treatment: towards a new generation of "smart" orthopaedic implants

TitleSuppression of nickel release in nickeltitanium alloys by plasma immersion ion implantation surface treatment: towards a new generation of "smart" orthopaedic implants
Authors
Issue Date2006
PublisherIEEE.
Citation
The 33rd IEEE International Conference on Plasma Science, Traverse City, MI, 4-8 June 2006, p. 434 How to Cite?
AbstractSummary form only given. Nickel-titanium shape memory alloys (NiTi) are potentially very useful in spinal deformity correction due to their super elastic properties and their ability to change shape with temperature. However, release of toxic nickel particulate debris remains a major concern. We have developed a novel method of altering the surface of the material to reduce nickel release by using plasma immersion ion implantation (PIII). This study compares the corrosion resistance and mechanical properties of PIII treated samples with untreated NiTi. NiTi discs containing 50.8% Ni were implanted with nitrogen using PIII technique. Their elemental depth profile, surface chemical composition, surface hardness and corrosion resistance were compared with untreated NiTi. The amount of Ni released into simulated body fluids after the accelerated corrosion tests were determined. The biocompatibility was assessed by culturing mouse osteoblasts expressing an enhanced green fluorescent protein on the surface of these materials. After PIII treatment, a layer of titanium nitride formed on the surface. Compared to untreated NiTi, the corrosion resistance is better by five times, and the surface hardness and elastic modulus are better by a factor of 2. The concentration of Ni in the simulated body fluid for the untreated sample was 30 ppm compared to undetectable levels in the PIII treated sample. There was no difference in the ability of cells to grow on either surface. PIII results in enhanced corrosion and wear resistance, and negligible Ni release. This technique will allow NiTi alloys to be safely implanted in the human body. A new generation of "smart" orthopaedic implants will likely result.
Persistent Identifierhttp://hdl.handle.net/10722/45681
ISBN
ISSN

 

DC FieldValueLanguage
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorChan, YLen_HK
dc.contributor.authorChan, SCWen_HK
dc.contributor.authorLiu, XYen_HK
dc.contributor.authorChung, CYen_HK
dc.contributor.authorChu, PKen_HK
dc.contributor.authorLu, WWen_HK
dc.contributor.authorLuk, KDKen_HK
dc.contributor.authorChan, Den_HK
dc.contributor.authorCheung, KMCen_HK
dc.date.accessioned2007-10-30T06:32:26Z-
dc.date.available2007-10-30T06:32:26Z-
dc.date.issued2006en_HK
dc.identifier.citationThe 33rd IEEE International Conference on Plasma Science, Traverse City, MI, 4-8 June 2006, p. 434en_HK
dc.identifier.isbn1-4244-0125-9-
dc.identifier.issn0730-9244en_HK
dc.identifier.urihttp://hdl.handle.net/10722/45681-
dc.description.abstractSummary form only given. Nickel-titanium shape memory alloys (NiTi) are potentially very useful in spinal deformity correction due to their super elastic properties and their ability to change shape with temperature. However, release of toxic nickel particulate debris remains a major concern. We have developed a novel method of altering the surface of the material to reduce nickel release by using plasma immersion ion implantation (PIII). This study compares the corrosion resistance and mechanical properties of PIII treated samples with untreated NiTi. NiTi discs containing 50.8% Ni were implanted with nitrogen using PIII technique. Their elemental depth profile, surface chemical composition, surface hardness and corrosion resistance were compared with untreated NiTi. The amount of Ni released into simulated body fluids after the accelerated corrosion tests were determined. The biocompatibility was assessed by culturing mouse osteoblasts expressing an enhanced green fluorescent protein on the surface of these materials. After PIII treatment, a layer of titanium nitride formed on the surface. Compared to untreated NiTi, the corrosion resistance is better by five times, and the surface hardness and elastic modulus are better by a factor of 2. The concentration of Ni in the simulated body fluid for the untreated sample was 30 ppm compared to undetectable levels in the PIII treated sample. There was no difference in the ability of cells to grow on either surface. PIII results in enhanced corrosion and wear resistance, and negligible Ni release. This technique will allow NiTi alloys to be safely implanted in the human body. A new generation of "smart" orthopaedic implants will likely result.-
dc.format.extent134158 bytes-
dc.format.extent2166303 bytes-
dc.format.extent2345 bytes-
dc.format.extent4339 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherIEEE.en_HK
dc.relation.ispartofIEEE International Conference on Plasma Science, ICOPS 2006-
dc.rights©2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleSuppression of nickel release in nickeltitanium alloys by plasma immersion ion implantation surface treatment: towards a new generation of "smart" orthopaedic implantsen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0730-9244&volume=&spage=434&epage=&date=2006&atitle=Suppression+of+nickel+release+in+nickeltitanium+alloys+by+plasma+immersion+ion+implantation+surface+treatment:+towards+a+new+generation+of+%27smart%27+orthopaedic+implants+(abstract)en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1109/PLASMA.2006.1707307en_HK
dc.identifier.hkuros136973-

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