Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (22): 4036-4040.doi: 10.3969/j.issn.1673-8225.2010.22.011

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Coronary artery stent heating under alternating current magnetic field

Wang Rui 1,2, Zhao Ling-yun2, Liu Ji-guang1, Tang Jin-tian2   

  1. 1 Jiamusi University, Jiamusi  154002, Heilongjiang Province, China; 2 Key Laboratory of Particle & Radiation Imaging, Ministry of Education; Institute of Medical Physics and Engineering, Department of Engineering Physics, Tsinghua University, Beijing  100084, China
  • Online:2010-05-28 Published:2010-05-28
  • About author:Wang Rui★, Studying for master’s degree, Physician, Jiamusi University, Jiamusi 154002, Heilongjiang Province, China; Key Laboratory of Particle & Radiation Imaging, Ministry of Education; Institute of Medical Physics and Engineering, Department of Engineering Physics, Tsinghua University, Beijing 100084, China wangrui7721@163. com
  • Supported by:

    the National Natural Science Foundation of China, No. 30571779*, 10775085*; Beijing Committee of Science and Technology, No. Z07000200540704*; Tsinghua-Yue-Yuen Medical Sciences Fund*; China Postdoctoral Science Foundation, No. 200801091*

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Abstract:

BACKGROUND: The safety of drug eluting stent is still in dispute. Local heating can be performed by exposing magnetic medium to alternating current (AC) magnetic field. The stents are mainly composed of alloy, so it is possible to heat under magnetic field, but few reports have been obtained in China or abroad.
OBJECTIVE: To study the temperature increasing of coronary stent under the AC magnetic field, and to explore the effects of magnetic field parameters (frequency and current intensity), as well as stent materials on the temperature increasing.
METHODS: Coronary stents of different materials: 316L stainless steel, Ni-Ti alloy and Co-Cr alloy were placed in the AC magnetic field. Temperature increasing induced by the AC magnetic field of various process parameters (frequency and current intensity, angle between the stent axis and the field direction) was examined by Cu-CuTi thermo-couple.
RESULTS AND CONCLUSION: Stent materials had great effect on the temperature increasing induced by magnetic field, among which 316L stainless steel had the highest heating effect. Temperature increasing would be restricted with increasing of the angle between the stent axis and the field direction. Higher temperature increasing was observed at higher AC magnetic frequency and current intensity.

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