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.

通过旋转弯曲试验研究了不锈钢丝绳和钛丝在310 K模拟体液中的疲劳性能，作为其应用于FES（功能电刺激）电极的基础研究。1.不锈钢丝绳(1)新型不锈钢（Fe-22Cr-10Ni-6Mn-2Mo-0.4N）钢丝绳比SUS3型具有更高的疲劳强度和耐磨腐蚀性能16L不锈钢钢丝绳在低最大弯曲应力水平下。(2)乳酸溶液中的金属离子浓度随着疲劳试验循环次数的增加而增加，这与不锈钢的化学成分一致。 ，在Hanks'溶液中，它们被抑制在较低水平，且离子洗脱量的顺序为Ni>Cr>Fe。 (3)Hanks'溶液中形成的羟基氧化铁(β-FeOOH)为：疲劳试验时的腐蚀产物，可使Hanks溶液中的铁离子和铬离子保持在较低浓度。2.钛丝(1)采用新型β型钛合金Ti-14Mo-3Nb-1.5Zr制成的丝，具有(2)C.P.Ti丝的疲劳极限(σ_f)与抗拉强度(σ_U)之比小于30%，疲劳强度优于C.P.Ti丝。 (3)具有类金刚石碳(DLC)涂层的C.P.Ti丝表现出相对较高的σ_f/σ_U值。该结果表明钛丝的疲劳寿命。可以通过DLC涂层工艺的优化来改善。

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）。