Modifying the surface of a titanium alloy with an electron beam and a-C:H:SiOx coating deposition to reduce hemolysis in cardiac assist devices

A. S. Grenadyorov, Solovyev, K. V. Oskomov, S. A. Onischenko, A. M. Chernyavskiy, M. O. Zhulkov, V. V. Kaichev

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The use of implantable mechanical pumps to support stable heart function saves lives to a large number of patients. The priority goal of research in this area is to develop advanced pumps that will ensure minimal injuries and fractures of blood cells. A combined method of modifying the surface of disk pump parts made of titanium alloy VT-6 has been developed to reduce blood hemolysis. The method includes material pretreatment with a high-current low-energy electron beam and plasma-enhanced chemical vapor deposition of a-C:H:SiOx coating. The effect of such electron beam parameters as the energy density and the number of pulses on the surface morphology, hardness, plasticity index, friction coefficient and wear rate of the titanium alloy was studied. The effect of the 1.6-μm-thick a-C:H:SiOx coating on the surface morphology, mechanical and tribological properties of VT-6 samples subjected to preliminary electron beam processing was also investigated. Parts of the disk pump were modified according to the proposed technology and pump was tested on the degree of red blood cell destruction. After modifying the surface of pump parts, the destruction of red blood cells did not occur during the 4-h experiment, unlike a similar pump without surface modification. It is shown that the physical properties of the surface are one of the most important factors affecting hemolysis in mechanical pumps to support stable heart function.

Original languageEnglish
Article number125113
JournalSurface and Coatings Technology
Volume381
DOIs
Publication statusPublished - 15 Jan 2020
Externally publishedYes

Keywords

  • a-C:H:SiO coating
  • Cardiac assist device
  • Electron beam treatment
  • Friction coefficient
  • Heart failure
  • Hemolysis
  • Roughness

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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