Abrasion and ion elution of implantable metallic electrode in bending-rotating fatigue testing

弯曲旋转疲劳试验中植入式金属电极的磨损和离子洗脱

• 批准号: 14350365
• 负责人: IGUCHI Yasutaka
• 金额: $ 4.54万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350365/
• 关键词: biomaterials; stainless steel; rotating-bending fatigue test; ion elution; Hanks' solution; lactic acid solution; wear debris; fretting corrosion; 摩耗紛; 磨耗紛

The fatigue properties of stainless steel wire ropes and titanium wires in simulated body fluids at 310 K were investigated in rotating-bending testing as a fundamental study for applications to the FES (Functional Electrical Stimulation) electrode.1.Stainless steel wire rope(1)The new stainless steel (Fe-22Cr-10Ni-6Mn-2Mo-0.4N) wire rope exhibited the higher fatigue strength and wear corrosion resistance than the type SUS3 16L stainless steel wire rope under low maximum bending stress level.(2)The metal ion concentrations in the lactic acid solution increased with increasing of number of cycles in fatigue testing, which agreed with the chemical composition of the stainless steels. On the other hand, in Hanks' solution, they are suppressed at the low level, and the order of the amounts of ion elution was Ni>Cr>Fe.(3)The ferric oxyhydroxides (β-FeOOH) was formed in Hanks' solution as corrosion products during fatigue testing, which might keep iron and chromium ions at low concentration in Hanks' solution.2.Titanium wires(1)The wire made of the new β-type titanium alloy, Ti-14Mo-3Nb-1.5Zr, had excellent fatigue strength compared with the C.P.Ti wire.(2)The ratio of fatigue limit (σ_f) to tensile strength (σ_U) of the C.P.Ti wire was less than 30 percent, which might be caused by the surface flaws introduced during the cold working process.(3)The C.P.Ti wire with diamond like carbon (DLC) coating exhibited the relatively high value of σ_f/ σ_U. This result suggests that the fatigue life of the titanium wire can be improved by the optimization of the DLC coating process.

为研究不锈钢钢丝绳和钛丝在310 K模拟体液中的疲劳性能，对不锈钢钢丝绳和钛丝在310 K模拟体液中的弯曲疲劳性能进行了研究，为不锈钢钢丝绳和钛丝在FES中的应用奠定了基础（功能性电刺激）电极1.不锈钢钢丝绳（1）新型不锈钢（Fe-22 Cr-10 Ni-6 Mn-2 Mo-0.4N）钢丝绳在较低的最大弯曲应力水平下，其疲劳强度和耐磨腐蚀性能均优于SUS 3 16 L不锈钢钢丝绳。（2）乳酸溶液中金属离子浓度随疲劳循环次数的增加而增加，这与不锈钢的化学成分相一致。而在Hanks溶液中，它们被抑制在较低水平，离子溶出量的顺序为Ni>Cr>Fe。（3）在疲劳试验过程中，Hanks溶液中生成的氢氧化铁（β-FeOOH）作为腐蚀产物，可使铁和铬离子保持在较低浓度。2.钛丝（1）新型β型钛合金Ti-14 Mo-3 Nb-1.5Zr制成的钛丝与普通钛丝相比，具有优异的疲劳强度。（2）C. P. Ti丝的疲劳极限（σ_f）与抗拉强度（σ_U）之比小于30%，这可能是由于冷加工过程中引入的表面缺陷所致。（3）类金刚石（DLC）涂层的C. P. Ti丝具有较高的σ_f/ σ_U值。这一结果表明，钛丝的疲劳寿命可以通过DLC涂层工艺的优化来提高。

项目成果

Y.Iguchi: "Fatigue Property of Stainless Steel FES Electrode in Hanks' Solution"International Functional Electrical Stimulation Society 2002. 217-219 (2002)

Y.Iguchi：“不锈钢 FES 电极在 Hanks 溶液中的疲劳性能”国际功能性电刺激学会 2002. 217-219 (2002)

Y.Iguchi: "Fatigue property of titanium.wire in 1mass%lactic acid solution"Proc.of the 9^<th> Annual Conf.on IFESS.. (印刷予定). (2004)

Y.Iguchi：“1mass%乳酸溶液中钛丝的疲劳性能”Proc.of the 9^<th>Annual Conf.on IFESS..（待印刷）。

Y.Iguchi: "Evaluation of fatigue property of titanium wire in rotating-bending testing"International Functional Electrical Stimulation Society 2004. (accepted). (2004)

Y.Iguchi：“旋转弯曲试验中钛丝疲劳性能的评估”国际功能性电刺激协会2004年。（已接受）。