Tribology in mechanical seal for blood

Koki Kanda, Koshi Adachi

Research output: Contribution to journalArticlepeer-review


Low friction and low leakage of blood are simultaneously required for mechanical seal for blood. Friction property of mechanical seal was investigated by means of specialized test apparatus for mechanical seal of actual ventricular assist device. It was found that formed protein film on sealing surfaces contributes to generate high and unstable friction property with unique periodic frictiona! peak. Fundamental analysis of protein film clarified that denatured protein film is formed on friction region and high shear strength induces high friction coefficient in blood. Therefore, running-in was introduced to SiC/SiC-made mechanical seal to form hydrophilic layer, which prevents protein adsorption, on sealing property and low and stable friction in blood was realized. Furthermore, to realize selective protein adsorption on sealing surface, DLC coating was introduced on textured mechanical seal and stabilized friction coefficient was also realized.

Original languageEnglish
Pages (from-to)748-754
Number of pages7
JournalToraibarojisuto/Journal of Japanese Society of Tribologists
Issue number11
Publication statusPublished - 2018


  • Denaturation
  • Friction property
  • Mechanical seal
  • Plasma protein
  • Protein adsorption
  • Sealing property


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