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  • Polyurethane and medical article therefrom
    Patent number: 5159050
    Abstract: A thermoplastic polyurethane has tertiary amino groups in the polymer chain. Protonation of the amino groups with an aqueous acid causes the polymer to absorb up to 1,000% by weight of water and swell. The protonated amino groups form a complex with an antithrombogenic agent to give an antithrombogenic polyurethane. The invention includes a shaped article of the polyurethane. The shaped article may be antithrombogenic.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: October 27, 1992
    Assignee: Becton, Dickinson and Company
    Inventor: Fidelis C. Onwumere
  • Biostable polyurethane
    Patent number: 5159051
    Abstract: A thermoplastic polyurethane having prolonged biostability has tertiary amino groups in the polymer chain. Protonation of the amino groups with an aqueous acid causes the polymer to absorb up to 1,700% by weight of water and swell. The protonated amino groups form a complex with an antithrombogenic agent to give an antithrombogenic polyurethane. The invention includes a shaped article of the polyurethane.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: October 27, 1992
    Assignee: Becton, Dickinson and Company
    Inventors: Fidelis C. Onwumere, Nancy L. Shields