Patents by Inventor David Tai-Wai Cheung

David Tai-Wai Cheung has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Borohydride reduction of biological tissues
    Patent number: 5862806
    Abstract: A method of using sodium or potassium borohydride to reduce dehydrated, aldehyde treated biological tissues is disclosed. The method comprises the steps of: providing the tissue, such as porcine heart valves or bovine pericardium; treating the tissue with an aldehyde, such as glutaraldehyde; dehydrating the tissue, for example by treatment with an anhydrous polar organic solvent such as ethanol; and, treating the tissue with sodium or potassium borohydride. Following reduction, the sodium borohydride may be extracted from the tissue with an organic solvent, such as ethanol. The tissue may be rehydrated for use in bioprosthetic implants such as heart valves and pericardial patches.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: January 26, 1999
    Assignee: Mitroflow International, Inc.
    Inventor: David Tai-Wai Cheung