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Treatments to reduce thrombogeneticity in heart valves made from titanium and its alloys

  • US 5,605,714 A
  • Filed: 06/07/1995
  • Issued: 02/25/1997
  • Est. Priority Date: 03/29/1994
  • Status: Expired due to Term
First Claim
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1. A method for coating a substrate comprised of titanium with diamond-like carbon comprising:

  • exposing said substrate to a vacuum at a pressure of about 10-5 torr or less;

    heating said substrate to between at least about 600°

    C.-650°

    C. (1112°

    F.-1202°

    F.);

    depositing silicon onto said substrate in an amount sufficient to form an inner bonding layer of titanium-silicide cohesively bonded to an outer layer of silicon;

    substantially simultaneous with said depositing of silicon, bombarding said deposited silicon with a first energetic beam of ions at a first energy, a first ion density, and for a first amount of time sufficient to form said inner titanium-silicide bonding layer cohesively bonded to said outer layer of silicon;

    condensing a diamond-like carbon precursor onto said outer layer of silicon at a second temperature and for a second amount of time sufficient to form a film of precursor molecules tin said outer layer of silicon, wherein said second temperature is sufficiently low that said diamond-like carbon precursor is not vaporized off of said substrate;

    substantially simultaneous with said condensing of a diamond-like carbon precursor, bombarding said diamond-like carbon precursor with a second energetic beam of ions at a second energy, a second ion density, and for a third amount of time sufficient to form an inner silicon carbide layer cohesively bonded to an outer coating of diamond-like carbon.

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