Patents by Inventor Helmut Waldert

Helmut Waldert 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).

  • Textile vessel prosthesis, process for its production and apparatus for its production
    Patent number: 6053938
    Abstract: The invention relates to a conical, textile vessel prosthesis made from textile material transformed by elastic expansion and fixing and/or by the shrinkage of shrinkable wall material, starting from a cylindrical tubular fabric, into a conical shape. The prosthesis preferably has a pleating.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: April 25, 2000
    Assignee: Aesculap AG & Co. KG
    Inventors: Helmut Goldmann, Helmut Waldert
  • Process for preparing bovine pericard materials and use thereof
    Patent number: 5413798
    Abstract: A process for treating bovine pericard tissue to increase resistance to biological degradation by wet-chemical processing, The wet-chemical processing consists essentially of: (i) separating any adherent fat and basal membrane from the tissue; (ii) contacting the tissue with an aqueous, alkaline solution of sodium hydroxide, potassium hydroxide, lithium hydroxide or sodium carbonate to swell the tissue; (iii) contacting the swollen tissue with an aqueous sodium chloride solution to control the swelling; (iv) contacting the tissue with a solution of a metal-ion complexing agent with a pH in excess of 11; and (v) contacting the tissue with an aqueous buffer solution having a pH of 4.5 to 6.0. Each of steps (ii)-(v) is followed by a water rinse. The pericard tissue is then dried and sterilized.
    Type: Grant
    Filed: April 6, 1994
    Date of Patent: May 9, 1995
    Assignee: B. Braun Melsungen Aktiengesellschaft
    Inventors: Edmund Scholl, Helmut Waldert, Helmut Beyer